NATIONAL TAIWAN UNIVERSITY - Effect of Whole Body Vibration on Muscle Tone and Hardness of Lower Extremity in the Patients with Spinal Cord Injury ...

At present it seems likely that the different components of the hand-arm vibration syndrome, eg, vibration-induced white finger (VWF), numbing of the hands and arms, muscular fatigue, and occasionally prevalent bone degeneration, may arise independently, and therefore they should be evaluated separately. Evidence of changes caused in the autonomic nervous functions of the body by local vibration is not conclusive. The vascular history should be confirmed objectively with a cold provocation test under laboratory conditions. In individual diagnostics it is useful to record (with modern plethysmographic techniques) the recovery of digital temperature, digital blood pressure, and flow after local cooling. Vibrotactile perception measurement seems to be suitable for group diagnosis. Much of the diagnostic weight for VWF can be obtained from accurate case histories, although, for early changes, the history may be atypical. The lack of simple objective tests for evaluating the hand-arm vibration ...

ABSTRACT In a study of vibration-induced white finger (VWF) 39 chain saw operators, being representative of 365 lumberjacks according to a completed questionnaire, underwent clinical investigation. In a medical interview 13 of the 39 had VWF and 26 were without finger symptoms. In the subjects with VWF both hands were equally affected, the third and fourth finger most frequently; the thumbs were always normal. A cold provocation test, measuring the finger systolic blood pressure with a cuff technique during combined body cooling and finger cooling to 30, 15, and 6°C, was applied to the 39 chain saw operators and to 20 age-matched outdoor workers who had not used vibrating hand tools. The finger most often showing Raynauds phenomenon was cold provoked, and a non-affected finger was used as a reference. The systolic pressure gradient measured at 30°C from the upper arm to the cooled finger was increased in the chain sawyers most severely affected by VWF compared with the control group and with ...

OBJECTIVES To investigate the acute effects of the frequency of hand transmitted vibration on finger circulation. A further aim was to investigate whether the frequency weighting assumed in current standards for hand transmitted vibration reflects the haemodynamic changes which occur in the fingers exposed to vibration with different frequencies but with the same frequency weighted acceleration magnitude.. METHODS Finger skin temperature (FST) and finger blood flow (FBF) were measured in the middle fingers of both hands of 10 healthy men. With a static load of 10 N, the right hand was exposed for 15 minutes to the following root mean square (rms) acceleration magnitudes and frequencies of vertical vibration: 5.5 m/s2 at 16 Hz; 11 m/s2 at 31.5 Hz; 22 m/s2 at 63 Hz; 44 m/s2 at 125 Hz; and 88 m/s2 at 250 Hz. These exposures to vibration produce the same frequency weighted acceleration magnitude (5.5 m/s2rms) according to the frequency weighting included in the international standard ISO 5349. A ...

There is the suggestion in the literature that vibration may potentate the effects of noise and may thus increase the risk of hearing loss. However in human experimental studies, which, by necessity, are limited to low levels of TTS, the effects measured while generally consistent, are relatively small. A very limited number of animal studies have also shown an enhanced hearing loss in the presenc

INTRODUCTION: Chemotherapy-induced peripheral neuropathy (CIPN) is a prevalent and clinically meaningful side effect of cancer treatment. CIPN is induced by neurotoxic agents, causing severe sensory and/or motor deficits, resulting in disability and poor recovery, reducing patients quality of life and limiting medical therapy. To date, effective treatment options are lacking. Whole-body vibration (WBV) training can attenuate motor and sensory deficits. We are conducting a two-armed, multicentre, assessor-blinded, randomised controlled trial, to investigate the effects of WBV on relevant symptoms of CIPN and determine the training characteristics. METHODS AND ANALYSIS: In this ongoing study, 44 patients who have completed therapy in the past 3 months, with a neurologically confirmed CIPN are assessed before and after a 12-week intervention and follow-up. The intervention group receives WBV twice a week. Exercises are individually tailored according to the initially determined optimal ...

Dentists, dental technicians and dental hygienists use vibrations from motorized dental equipment, which can cause a condition called Hand-Arm Vibration Syndrome (HAVS)

Motorized vibrating manure forks were used in beach-cleaning operations following the massive Deepwater Horizon oil spill in the Gulf of Mexico during the summer of 2010. Objectives: The objectives of this study were to characterize the vibration emissions of these motorized forks and to provide a first approximation of hand-transmitted vibration exposures to workers using these forks for beach cl

A device to be worn in the ear of a subject provides a direct vibrational drive to the tympanic membrane through a vibrationally conductive assembly which couples vibrations from a vibratory transducer positioned within the ear canal proximal to the tympanic membrane. In one embodiment of the invention, the device is a hearing aid positioned inconspicuously deep within the ear canal. The vibrationally conductive assembly is removably attached to the umbo area of the tympanic membrane. The vibrationally conductive assembly is designed to conduct vibrations in the audible frequency range while absorbing static forces caused by device placement and ear canal movement attributable to jaw movements of the wearer, including speaking, eating, drinking, chewing, yawning, and so forth. The unique coupling characteristics of the vibrationally conductive assembly allow for a highly efficient transfer of vibrations in the audible frequency range to the tympanic membrane without exerting damaging forces on the

TY - JOUR. T1 - Intramolecular vibrational energy redistribution in S0 benzene at low vibrational energies. AU - Whetton, Narrelle T.. AU - Lawrance, Warren D.. PY - 1992/1/3. Y1 - 1992/1/3. N2 - Rotationally resolved dispersed fluorescene spectra from the 61 level of benzene have been used to probe intramolecular vibrational energy redistribution in the ground electronic state. The level 12 (Evib=1986 cm-1) and 13 (Evib=2979 cm-1) are observed to be each coupled to a single close-lying level. We propose that the pertubing levels are 52 in the case of 12 and 5211 in the case of 13. The coupling constant k1155 has been determined to be 1.4 cm-1.. AB - Rotationally resolved dispersed fluorescene spectra from the 61 level of benzene have been used to probe intramolecular vibrational energy redistribution in the ground electronic state. The level 12 (Evib=1986 cm-1) and 13 (Evib=2979 cm-1) are observed to be each coupled to a single close-lying level. We propose that the pertubing levels are 52 in ...

INTRODUCTION: This study aimed to determine the prevalence of Dupuytrens disease in men and its relationship with work exposure, particularly heavy manual work with and without significant use of vibrating tools, using data from a surveillance program for musculoskeletal disorders. METHOD: This cross-sectional study was conducted in France between 2002 and 2005. Dupuytrens disease was diagnosed clinically by one of 83 occupational physicians. Exposure in relation to work status and occupational risk factors was assessed with a self-administered questionnaire, and categorised according to vibration exposure (defined as use of vibrating tools for ≥2 h/day), heavy manual work without vibration exposure (defined as use of hand tools for ≥2 h/day (use of vibrating tools for ≥2 h/day excluded) and Borg scale ≥15/20) and no such exposure. Bivariate and multivariate associations using logistic models were recorded in men and in those with |10 years in the same job. RESULTS: Of 2161 men, 1.3% (n=27)

Background and Objectives During speech, the vocal folds oscillate at frequencies ranging from 100-200 Hz with amplitudes of a few millimeters. Mechanical stimulation is an essential factor which affects metabolism of human vocal folds. The effect of mechanical vibration on the cellular response in the human vocal fold fibroblasts cells (hVFFs) was evaluated. Materials and Method We created a culture systemic device capable of generating vibratory stimulations at human phonation frequencies. To establish optimal cell culture condition, cellular proliferation and viability assay was examined. Quantitative real time polymerase chain reaction was used to assess extracellular matrix (ECM) related and growth factors expression on response to changes in vibratory frequency and amplitude. Western blot was used to investigate ECM and inflammation-related transcription factor activation and its related cellular signaling transduction pathway. Results The cell viability was stable with vibratory ...

In this crossover study we investigated the differential treatment effects of visual exploration training alone and visual exploration training in combination with neck muscle vibration. The results provide clear evidence that the addition of contralesional neck vibration to a standard method of treating neglect leads to additive and lasting treatment effects. Further, we showed that the additive effects of vibration transferred from trained tasks (visual exploration) to untrained tasks (text reading), and from the visual to the tactile mode. Moreover, the combined treatment led to a reduction in daily life problems concerning self care, reaching and grasping, and spatial orientation in comparison with the effects achieved by exploration training alone.. These improvements are not the result of therapeutic cost effects because in the exploration tasks as well as in text reading the amelioration of exploration behaviour on the contralesional left side was not accompanied by an increase of ...

An electronic still camera with a printer includes a vibration detector and a system controller. The vibration detector detects vibration relative to a moving direction of an exposure head of the printer. When the vibration detector detects the vibration exceeding a prescribed level, the system controller interrupts a printing operation of the printer. After that, when the vibration detector detects the vibration falling below the prescribed level, the system controller resumes the printing operation. The exposure head is adapted to be moved, performing the printing operation one line by one line. Until the printing operation for one line is completed, the system controller suspends to interrupt the printing operation.

Recently a new and novel noninvasive imaging-based technique known as Magnetic Resonance Elastography (MRE) was developed that is capable of quantifying stiffness of soft tissues such as liver, spleen, kidney, heart brain, breast, aorta etc. In MRE a person is laid into an MR scanner which is similar to all MR scans. In addition, a drum (passive driver) is placed on the body (area close to the region of interest), which is connected by a long plastic tube that runs outside the scan room. This drum is tightly strapped by a Velcro to the body for better contact. Then the other end of the plastic tube is connected to an active driver that produces vibrations of frequencies in the range of 20Hz -2kHz. These frequencies of vibrations are transferred to the passive driver which produces vibrations on the body. These vibrations are tracked using MR scanner to produce wave images. A post-processing of these wave images are performed to obtain spatial stiffness maps. Currently, MRE is a clinical tool to ...

OBJECTIVE: To examine the therapeutic potential of stochastic vibrotactile stimulation (SVS) as a complementary non-pharmacological intervention for withdrawal in opioid-exposed newborns. STUDY DESIGN: A prospective, within-subjects single-center study was conducted in 26 opioid-exposed newborns ( | 37 weeks; 16 male) hospitalized since birth and treated pharmacologically for Neonatal Abstinence Syndrome. A specially-constructed mattress delivered low-level SVS (30-60Hz, 10-12mum RMS), alternated in 30-min intervals between continuous vibration (ON) and no vibration (OFF) over a 6-8 hr session. Movement activity, heart rate, respiratory rate, axillary temperature and blood-oxygen saturation were calculated separately for ON and OFF. RESULTS: There was a 35% reduction in movement activity with SVS (p|0.001), with significantly fewer movement periods | 30 sec duration for ON than OFF (p = 0.003). Incidents of tachypneic breaths and tachycardic heart beats were each significantly reduced with SVS, whereas

In human subjects the triceps surae of one leg was exercised eccentrically by asking subjects to walk backwards on an inclined treadmill. Before the exercise controlled local pressure, applied to the muscle with an electromagnet, produced mild soreness, which was reduced when the pressure was combined with vibration. When delayed-onset muscle soreness (DOMS) had set in, 24-48 h after the exercise, vibration increased pain from local pressure. Vibrating at different frequencies suggested 80 Hz as the optimal frequency. During 2-h testing post-exercise, evidence of a change in character of the effects of vibration was first detected at 6 h. It persisted up to 72 h post-exercise. When muscle pain was generated in an unexercised triceps by injection of hypertonic (5%) saline, controlled local pressure applied to the sore area increased pain levels by 32% while pressure plus vibration reduced this to 11%. In a subject with DOMS, local pressure again increased pain from saline by 32% but combining it ...

Hello and welcome to Hearing TV. My name is Merren Davies.. In the last episode we discussed Middle Ear hearing implants.. Today we are going to INTRODUCE the COCHLEAR IMPLANT.. The cochlear implant could be described as the ULTIMATE SOLUTION for people who cannot benefit from a conventional hearing aid.. To understand how the COCHLEAR IMPLANT works we need to remind ourselves of how normal hearing works:. Sounds around us reaches our ears by a relay of air molecule vibrations. These vibrations reach our eardrum, which transmit the VIBRATION of sound through to the INNER EAR via the interconnection of the 3 smallest bones in the body, which CONNECT the EARDRUM to the INNER EAR - the COCHLEA.. The COCHLEA changes the mechanical Vibration into an Electrical signal, which is picked up by our Hearing Nerve and transmitted up to the BRAIN - where the true HEARING happens.. Most permanent hearing losses are due to a malfunction of the INNER EAR. The COCHLEAR IMPLANT is designed to replace the ...

Noise has many meanings but in the context of environmental management the term is synonymous with sound or acoustic energy and is taken to include mechanical vibration. However, noise and sound generally refer to acoustic energy in the atmosphere and vibration refers to acoustic energy in condensed media such as the ground, water and built structures.. High levels of noise are generally considered to be unpleasant and can have health implications. Elevated levels of noise in a neighbourhood are consistent with reduced amenity and would be expected to lead to devaluations in property values. Given the option, people and animals tend to leave areas with high ambient noise levels.. In general, the level of noise emitted from a device or an activity can be controlled.. The legislative thrust, as presented in the Environment Protection Policy (Noise) 2009, is to protect those qualities of the acoustic environment that are conducive to the wellbeing of the community together with its ...

Vocal fold vibration is vital in voice production and the correct pitch of speech. We have developed a high speed functional optical coherence tomography (OCT) system with a center wavelength of 1050 nm and an imaging speed of 100,000 A-lines per second. We imaged the vibration of an ex-vivo swine vocal fold. At an imaging speed of 100 frames per second, we demonstrated high quality vocal fold images during vibration. Functional information, such as vibration frequency and vibration amplitude, was obtained by analyzing the tissue surface during vibration. The axial direction velocity distribution in the cross-sectional images of the vibrating vocal folds was obtained with the Doppler OCT. The quantitative transverse direction velocity distribution in the cross-sectional images was obtained with the Doppler variance images.. ©2011 Optical Society of America. Full Article , PDF Article ...

Three compounds derived from 4-aminoantipyrine (AA) were synthesized and their structures confirmed by melting point, elemental analysis, FT-IR, and 1H-NMR. The molecular structures of the four compounds were characterized by single-crystal X-ray diffraction and calculated by using the density functional theory (DFT) method with 6-31G (d) basis set. The calculated molecular geometries and the vibration frequencies of the AA derivatives in the ground state have been compared with the experimental data. The results show that the optimized geometries can reproduce well the crystal structural parameters, and the theoretical vibration frequencies show good agreement with the experimental data, although the experimental data are different from the theoretical ones due to the intermolecular forces. Besides, the molecular electrostatic potential (MEP) and the frontier molecular orbital (FMO) analysis of the compounds were investigated by theoretical calculations.

The contact surface structure of dry friction damper is complicate, irregular, and self-similar. In this paper, contact surface structure is described with the fractal theory and damping blade is simplified as 2-DOF cantilever beam model with lumped masses. By changing the position of the damper, lacing and shroud structure are separately simulated to study vibration absorption effect of damping blade. The results show that both shroud structure and lacing could not only dissipate energy but also change stiffness of blade. Under the same condition of normal pressure and contact surface, the damping effect of lacing is stronger than that of shroud structure. Meanwhile, the effect on changing blade stiffness of shroud structure is stronger than that of lacing. This paper proposed that there is at least one position of the blade, at which the damper dissipates the most vibration energy during a vibration cycle.

The effects of localized vibration on delayed onset muscle soreness following intense eccentric cycling - Dr. Fredrick Peters - Doctoral Thesis / Dissertation - Physical Therapy / Occupational Therapy - Publish your bachelors or masters thesis, dissertation, term paper or essay

Sum frequency generation (SFG) vibrational spectroscopy was used to investigate the interfacial properties of several amino acids, peptides, and proteins adsorbed at the hydrophilic polystyrene solid-liquid and the hydrophobic silica solid-liquid interfaces. The influence of experimental geometry on the sensitivity and resolution of the SFG vibrational spectroscopy technique was investigated both theoretically and experimentally. SFG was implemented to investigate the adsorption and organization of eight individual amino acids at model hydrophilic and hydrophobic surfaces under physiological conditions. Biointerface studies were conducted using a combination of SFG and quartz crystal microbalance (QCM) comparing the interfacial structure and concentration of two amino acids and their corresponding homopeptides at two model liquid-solid interfaces as a function of their concentration in aqueous solutions. The influence of temperature, concentration, equilibration time, and electrical bias on the extent

Viscous friction occurs between the roller guide shoes and guide rail because of the grease layer.This friction causes to vibration on the cage. This studys aim is an investigation and active control of that vibration for passengers. Initially, the passenger elevators dynamics modeling is carried out by Linear Graph Method. The DC motor and AC motor parameters are used in the system modeling separately. Then, vibrations occurred on the elevator cabin are observed. Finally, the effect of vibrations is reduced with the aid of an active controller. The time and frequency responses are compared for two kinds of the motor. ...

Bacterial diversity analysis of moderately thermophilic microflora enriched by different energy sources In this study, cultures grown from explants of rabbit rib perichondrium were exposed to exogenously added transforming growth factor-beta 1 at concentrations of 0.1-10 ng/ml of media. Correlations with the Short Form-36 were used to investigate the convergent validity. Antioxidant status in ceftin dogs with idiopathic dilated cardiomyopathy. The pathological hallmark of Alexander disease is the inclusion body, known as Rosenthal fiber, within the cell bodies and processes of astrocytes. Although IL-4, IL-5, IL-10, and IL-13 each regulate distinct aspects of the granulomatous inflammatory response, IL-13 was identified as the primary mediator of liver fibrosis. Acute effect of whole body vibration on postural control in congenitally blind subjects: clarithromycin a preliminary evidence. Heterokaryons have been utilized for complementation and dominance testing of mutations that affect ...

0042]The forearm brace 20, as shown in a highly schematic view of FIG. 1, generally comprises three interoperating portions. The first portion is the attachment device 24 which is configured to attach to the power tool 22. In one form, the attachment device 24 can be attached to the power tool 22 without requiring any substantial or permanent modification to the power tool 22. This allows the forearm brace 20 to be positioned upon a variety of power tools. The second portion of the forearm brace 20 is the support arm 26 which extends longitudinally outward from the power tool 22 and is formed as part of, or coupled to, the attachment device 24. The third portion of forearm brace 20 is the forearm engagement surface 28 which is connected to the support arm 26 substantially at the opposite end from the power tool 22 and attachment device 24. The forearm engagement surface 28 may be a rigid device, which can extend transversely outward from one or both transverse sides of the support arm 26. This ...

TY - JOUR. T1 - 1365. Smoothed particle hydrodynamics modeling of vibro-assisted turning of Ti alloy: influence of vibration parameters. AU - Demiral, Murat. N1 - KAUST Repository Item: Exported on 2020-10-06 Acknowledgements: The research leading to these results received funding from KAUST baseline fund.. PY - 2014/1/1. Y1 - 2014/1/1. N2 - Several modern engineering materials are difficult to process with conventional machining methods. Ultrasonically assisted turning (UAT) is a novel machining technique, where high frequency vibration is superimposed on the cutting tool. Compared to conventional turning (CT), it demonstrated a range of benefits in processing many intractable materials. A decrease in the average cutting force, an improvement in the surface finish and noise reduction were observed. In this study a Lagrangian smoothed particle hydrodynamics (SPH) was introduced for the modeling of the vibro-assisted turning of this advanced alloy. The UAT was implemented into the model by using ...

There are a handful of naturally occurring materials, known as piezoelectric materials, that generate electricity if you bend, stretch or apply another mechanical force to them, and vice versa -- if you apply a voltage across them, theyll deform accordingly. These materials are currently the subject of intense research for their potential applications in energy harvesting, artificial muscles and sensors, among others. These materials are also used in everyday devices, such as loudspeakers, which rely on piezoelectrics to convert electrical signals to mechanical vibrations which create sound waves to produce the desired acoustic signal. Mechanical engineers have now identified one of the thinnest possible piezoelectric materials on the planet -- graphene nitride ...

In 1880, French physicists Pierre Curie, and his elder brother Jacques Curie, discovered the piezoelectric effect in certain crystals. Paul Langevin, a student of Pierre Curie, developed piezoelectric materials, which can generate and receive mechanical vibrations with high frequency (therefore ultrasound). During WWI, ultrasound was introduced in the navy as a means to detect enemy submarines. In the medical field, however, ultrasound was initially used for therapeutic rather than diagnostic purposes. In the late 1920s, Paul Langevin discovered that high power ultrasound could generate heat in bone and disrupt animal tissues. As a result, ultrasound was used to treat patients with Ménière disease, Parkinson disease, and rheumatic arthritis throughout the early 1950s. Diagnostic applications of ultrasound began through the collaboration of physicians and SONAR engineers. In 1942, Karl Dussik, a neuropsychiatrist and his brother, Friederich Dussik, a physicist, described ultrasound as a ...

This shows the design of the optical interferometer. It is classed as a Sagnac interferometer because of its use of counterpropagating light beams. PBS, NPBS and λ/4 stand for polarizing beam splitter, non-polarizing beam splitter and quarter-wave plate, respectively. Two probe pulses arrive at the sample at an interval of 500 picoseconds, and these pulses are combined at the photodetector, where the interfererence occurs. Each pulse effectively probes the outward surface displacement of the sample. We obtain a signal proportional to the out-of-plane surface velocity of the sample at the probed point. The diameter of the probed region is about 2 microns. The two probe pulses travel in opposite directions inside the interferometer, but cover the same total optical path, and so the interferometer is relatively insensitive to alignment error and mechanical vibration. Such a design is termed common-path. More details are given in Detection of ultrafast phenomena using a modified Sagnac ...

Efficacy of Whole Body Vibration Training on Pelvic Floor Muscle Strength, Severity of Incontinence and Quality of Life in Females with Urinary Incontinence ...

Biomechanical stimulation (BMS) is a term generally used for localised biomechanical oscillation methods, whereby local muscle groups are stimulated directly or via the associated tendons by means of special hand held mechanical vibration devices. Biomechanical oscillation therapy and training is offered in a variety of areas such as competitive sports,[37] fitness, rehabilitation,[38] medicine,[39] prevention, beauty, and used to improve performance of the muscles and to improve coordination and balance. It is often used in the Myofascial trigger point therapy concept to invoke reciprocal inhibition within the musculoskeletal system. Beneficial effects from this type of stimulation have been found to exist, the efficacy of the BMS Matrix therapy was proven in an independent study.[40] carried out by TÜV-Süd which was commissioned by German health insurer BKK Gesundheit ...

Environment, more than anything, influences what a listener deems to be good music. Music at its bare is simply a chemical reaction; the hairlike cilia of the inner ear convert mechanical vibrations to electro-chemical neuron signals. Many theories of musical organization exist; in fact, a huge literature surrounds the western 12 tone scale. But perhaps it is the dead weight of tradition that holds the piano scale in such esteem. Conventions are probably the greatest barrier to rational inquiry and progress in music. The hearing mechanism is completely and totally aurally neutral, and it is probably only through proper indoctrination that we come to know what we like. There is a noticeable lack of individuality in contemporary music. MTV always seems to sound alike; orchestral performers look ready to fly apart at the seams from the frenzied ceaseless motions. Against this backdrop, it may well be that the prime directive for contemporary musicians is to explore new sounds on new instruments. ...

We discuss spacecraft Doppler tracking for detecting gravitational waves in which Doppler data recorded on the ground are linearly combined with Doppler measurements made on board a spacecraft. By using the four-link radio system first proposed by Vessot and Levine, we derive a new method for removing from the combined data the frequency fluctuations due to the Earth troposphere, ionosphere, and mechanical vibrations of the antenna on the ground ...

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OBJECTIVE: To show that neck proprioceptive input can induce long-term effects on vestibular-dependent self-motion perception. METHODS: Motion perception was assessed by measuring the subjects error in tracking in the dark the remembered position of a fixed target during whole-body yaw asymmetric rotation of a supporting platform, consisting in a fast rightward half-cycle and a slow leftward half-cycle returning the subject to the initial position. Neck muscles were relaxed or voluntarily contracted, and/or vibrated. Whole-body rotation was administered during or at various intervals after the vibration train. The tracking position error (TPE) at the end of the platform rotation was measured during and after the muscle conditioning maneuvers. RESULTS: Neck input produced immediate and sustained changes in the vestibular perceptual response to whole-body rotation. Vibration of the left sterno-cleido-mastoideus (SCM) or right splenius capitis (SC) or isometric neck muscle effort to rotate the ...

Find out how to prevent risk and injury on construction sites from hand-arm vibration, with Hiltis tailor-made health and safety training.

TY - JOUR. T1 - Effects of vibratory stimulation on sexual response in women with spinal cord injury. AU - Sipski, Marca L.. AU - Alexander, Craig J.. AU - Gomez-Marin, Orlando. AU - Grossbard, Marissa. AU - Rosen, Raymond. PY - 2005/9. Y1 - 2005/9. N2 - Women with spinal cord injuries (SCIs) have predictable alterations in sexual responses. They commonly have a decreased ability to achieve genital sexual arousal. This study determined whether the use of vibratory stimulation would result in increased genital arousal as measured by vaginal pulse amplitude in women with SCIs. Subjects included 46 women with SCIs and 11 nondisabled control subjects. Results revealed vibratory clitoral stimulation resulted in increased vaginal pulse amplitude as compared with manual clitoral stimulation in both SCI and nondisabled subjects; however, these differences were not statistically significant. Subjective levels of arousal were also compared between SCI and nondisabled control subjects. Both vibratory and ...

Now here is a pair of gaming headphones that you might want to consider, especially since it comes with one feature that most of the other gaming headsets in the market do not - vibration! Well, the company behind this pair of gaming headphones needed to do something really different from what is already available in order to capture the attention of a fickle audience, doesnt it? Hence the $49.99 Rosewill 5.1 Channel Gaming Headset with Vibration, where it is said to offer you a whole lot more bang for your hard earned buck.. The Rosewill 5.1 Channel Gaming Headset with Vibration, as its name suggests will come with 5.1 surround sound capability, complete with vibration and 8 precise speakers. Fret not, your ears will not fall off after a particularly gruelling gaming session, as there will be soft ear-pad cushions that offer an additional level of comfort, while the headset itself boasts of an excellent uni-directional, noise-cancelling microphone. Heck, the included driver CD will even allow ...

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Wind Turbine Vibrations. This is a lumped parameter model of a wind turbine that can be used to study the vibrations that result due to unbalanced rotors. The percentage difference p between the mass moment of inertia of the blade that causes the imbalance and the mass moments of inertia of the other two standard blades is one of the parameters that can be varied. Download a MapleSim model file for Wind Turbine Vibrations. Get the S-Function for Wind Turbine Vibrations

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TY - JOUR. T1 - Evaluation of a re-engineered device for penile vibratory stimulation in men with spinal cord injury. AU - Ibrahim, Emad. AU - Jensen, Christian F.S.. AU - Sunara, Ivan. AU - Khodamoradi, Kajal. AU - Aballa, Teodoro C.. AU - Elliott, Stacy. AU - Sonksen, Jens. AU - Ohl, Dana A.. AU - Hultling, Claes. AU - Lynne, Charles M.. AU - Seager, Stephen W.J.. AU - Brackett, Nancy L.. N1 - Publisher Copyright: © 2020, The Author(s), under exclusive licence to International Spinal Cord Society.. PY - 2021/2. Y1 - 2021/2. N2 - Study design: Cohort study Objectives: The purpose of this study was to evaluate the performance of a re-engineered device (Ferticare 2.0), which is replacing the previous standard (Ferticare 1.0) for penile vibratory stimulation in men with spinal cord injury. Most men with spinal cord injury are anejaculatory, requiring medical assistance to obtain their semen. Penile vibratory stimulation is generally recognized as the standard of care for semen retrieval in these ...

The pain reducing effect of vibratory stimulation at 100 Hz, transcutaneous electrical nerve stimulation (TENS) at 100 Hz, electroacupuncture at 2 Hz as compared to placebo was studied in 36 patients suffering from myalgia. In 29 patients these modes of stimulation produced pain reduction. Out of these patients 18 rated vibratory stimulation, TENS or electroacupuncture as more effective than placebo while 6 patients rated placebo as more effective. Five patients rated the pain suppressive effect of vibratory stimulation, TENS and electroacupuncture as being equal to that of placebo. Four of the patients who experienced pain reduction with peripheral stimulation reported an effect only for one particular type of peripheral stimulation. The present results provide evidence that vibratory stimulation, TENS and electroacupuncture are as efficient pain suppressive measures and superior to placebo. It is suggested on the basis of these findings that vibratory stimulation, TENS and electroacupuncture ...

Request Report Methodology @ https://www.persistencemarketresearch.co/methodology/26926 The content of the study subjects, includes a total of 15 chapters:. Chapter 1, to describe Vibrational Circular Dichroism Spectrometer product scope, market overview, market opportunities, market driving force and market risks.. Chapter 2, to profile the top manufacturers of Vibrational Circular Dichroism Spectrometer , with price, sales, revenue and global market share of Vibrational Circular Dichroism Spectrometer in 2017 and 2020.. Chapter 3, the Vibrational Circular Dichroism Spectrometer competitive situation, sales, revenue and global market share of top manufacturers are analyzed emphatically by landscape contrast.. Chapter 4, the Vibrational Circular Dichroism Spectrometer breakdown data are shown at the regional level, to show the sales, revenue and growth by regions, from 2014 to 2020.. Chapter 5, 6, 7, 8 and 9, to break the sales data at the country level, with sales, revenue and market share for ...

Previous theoretical studies have shown that piezoelectric proton exchange membrane fuel cells (PZT-PEMFCs) might solve water flooding problems and increase cell performance. The innovative design of PZT-PEMFCs results in more oxygen being compressed into the catalyst layer. This enhances the electrochemical reaction and the current density, especially at a high PZT vibration frequency (64 Hz). In this investigation, a single, valveless PZT-PEMFC experimental fuel cell is built. The results are then compared with those of previous theoretical studies. This study includes an analysis of PZT vibration frequencies, and cell operation temperatures. A Nafion 212 membrane with a reaction area of 2 cm × 2 cm is used to measure the voltage and average current density under different temperatures and vibration frequencies. When the PZT device moves upward and increases the chamber volume, a diffuser directs most of the air to the outlet. In the valveless PZT-PEMFC, both a nozzle and diffuser are used. ...

A means for intracavity sum frequency generation is described in which a er operates simultaneously, cw, at two wavelengths where the net gain at one wavelength is substantially lower than that at the other. The optical alignment of the resonator provides a region where both fundamental wavelengths are overlapped, and another region where both feedback paths are spatially distinct. An active feedback mirror is located in the path of the lower net gain laser transition to provide optical amplification at that wavelength. The laser resonator further contains a sum frequency generating crystal for intracavity sum frequency generation of the two fundamental wavelengths. The sum frequency generating crystal is placed near a laser resonator cavity mode waist in the region where both wavelengths are spatially superimposed, producing the sum frequency of the two wavelengths. An intracavity polarization rotator provides the appropriate orientation of the polarization of the two fundamental wavelengths in the

Current gold standard of bladder outlet diagnosis is pressure flow study. This study is invasive time consuming and requires expensive and complex set-up. In this study the investigators plan to evaluate an alternative technology that presumably is able to diagnose bladder outlet obstruction using a Dynamic Urine Vibration Holter based on a Urine Flow Vibration Analysis technology. The acoustic vibration sensor is a small device that records the vibration due to urine flow. The patient attaches the sensor to the penis using a disposable sensor patch for the duration of approximately one minute during one urination. The analysis is performed off-line and the results are compared to the results of a standard pressure flow study and to the standard free flowmetry test. The innovative technology for the diagnosis of bladder outlet obstruction is noninvasive, rapid and does not involve complex setup ...

This application relates to a fibre optic cable which is adapted for use in a distributed fibre optic sensor such as a distributed acoustic sensor. The cable (201) comprises at least one optical fibre (208) and a shear thickening non-Newtonian fluid (202) disposed within the cable. The presence of a shear thickening fluid in the cable means that in response to a mechanical vibration or strain such as due to an incident acoustic wave the apparent viscosity of the non-Newtonian fluid will increase. In effect the cable will stiffen which will increase the strain on the optical fibre used for sensing, and thus increase the sensitivity of the cable to incident signals. The non-Newtonian fluid may be a dilatant material and/or a rheopectic material and may comprise comprises a plurality of particles disposed within a liquid.

TY - JOUR. T1 - The rich ultraviolet spectrum of vibrationally excited interstellar H2 toward HD 37903. AU - Meyer, David M.. AU - Lauroesch, J. T.. AU - Sofia, Ulysses J.. AU - Draine, B. T.. AU - Bertoldi, Frank. N1 - Copyright: Copyright 2015 Elsevier B.V., All rights reserved.. PY - 2001/5/20. Y1 - 2001/5/20. N2 - Based on recent high-resolution Hubble Space Telescope Space Telescope Imaging Spectrograph observations over the 1160-1360 Å wavelength region, we have discovered that HD 37903 (the illuminating star of the bright reflection nebula NGC 2023 in Orion) exhibits a rich spectrum of vibrationally excited interstellar H2 absorption. We have identified a total of over 500 H2 lines arising from various rotational levels (as high as J = 13) in all 14 excited vibrational states of the ground electronic state. Prior to this study, the only published UV absorption measurements of vibrationally excited interstellar H2 consisted of two weak lines toward the star ζ Ophiuchi. In terms of ...

Electromagnetic Vibrating Feeder mainly consists of feeding trough, electromagnetic vibration exciter and shock absorber. Powder Grinding Mill.GZ electromagnetic vibration feederChina Henan Zhengzhou Electromagnetic vibration feeder is a kind of equipment that can control the amount of feed, can achieve uniform feeding, easy to control the output adjustment.Electromagnetic Grinding Machine AlibabaElectromagnetic Grinding Machine, Wholesale Various High Quality Electromagnetic Grinding Machine Products from Global Electromagnetic Grinding Machine Suppliers and design of the electromagnetic vibrating feeder for ball design of the electromagnetic vibrating feeder for ball mill grinding Hot Productelectromagnetic separators zircon ore price cliwebdesignelectromagnetic vibrating grinding. electromagnetic vibration for grinding crusherasiacrusherasia› Grinding Mill InformationUser rating 9.3/10 electromagnetic Electromagnetic Vibrating Feeder Jaw Crusher Mobile CrusherMobile Jaw Crusher Grinding ...

Looking for definition of Vibration? Vibration explanation. Define Vibration by Websters Dictionary, WordNet Lexical Database, Dictionary of Computing, Legal Dictionary, Medical Dictionary, Dream Dictionary.

A vibration control device 1 in accordance with the present invention is provided with a liquid lever mechanism 4 which has an action member 5, a liquid chamber 6 and a driving plate 7, and is used for enlarging a displacement, a piezo-actuator 2 which can be displaced in a direction so as to change the volume of the liquid chamber 6, and a rubber vibration isolator 3 which is placed between the liquid lever mechanism 4 and the piezo-actuator 2 in series therewith. This vibration control device 1 has a low natural frequency so that it has a superior passive vibration-blocking performance at high-frequency bands, while maintaining a superior active vibration-blocking performance at low-frequency bands, and also makes it possible to achieve a small size.

Wavelet transforms are used to explore the dynamic evolution of granular material by post-processing data from DEM simulations. Data sets generated from two different physical scenarios were analysed: particles in vibration cells and samples under compression. It is shown how the wavelet multiresolution analysis (MRA) helps to reveal the particle motions within a vibration box subject to applied vibrations. Two combinations of amplitude and frequency vibration were applied in this work: low frequency with high amplitude and high frequency with low amplitude. Both cases give the same acceleration amplitude of approximately 7.8g where g is the acceleration due to gravity and both mono-sized particles and binary mixture were considered. The root mean square of the fluctuating velocity and the packing fraction of the two data sets are also consistent with the analysis results of the wavelets technique. Furthermore, it is shown how the MRA techniques were used to capture the position of ...

Their tasting room had a number of stellar efforts - they had their Kombucha Pale Ale, ginger and Honeysuckle Charlie. The Honeysuckle Charlie is one of their newest teas, and presented imbibers with sweeter melon and sugary notes. Their ginger kombucha beer linked together sweet and spicy elements before providing an ample amount of tartness to conclude the effort.. Sitting near their bar was a SCOBY - symbiotic colony of bacteria and yeast, which represents the backbone for the kombucha. This colony will make its way into an effort to be released later this year - a Kombucha Cream Ale that will be in incredibly high demand. Consider yourself lucky if you can pick up a bottle before it flies off of shelves. Unity Vibration describes the effort as a complex and brighter take on the cream ale format. Make sure to visit Unity Vibrations tasting room or see them at the Michigan Brewers Guild Summer Beer Festival, July 25th and 26th in Ypsilanti.. Unity Vibration Visit / 93 Ecorse Road, Ypsilanti, ...

In the UK the Health & Safety Executive (HSE) estimate that 5m workers are exposed to hand-transmitted vibration (HTV) in the workplace and of these 2m are exposed at levels that put them at risk of developing vibration-related disease [1]. The potentially disabling nature of these disorders has been increasingly recognized and the European Union has published a directive, for implementation by member states, placing limits on acceptable levels of exposure for individual workers. However important areas of uncertainty remain including those disorders likely to be caused by, as opposed to being associated with, HTV; the relative roles of the occupational history and standardized laboratory testing in diagnosis; and the establishment of safe levels of HTVexposure. In this issue of Occupational Medicine three papers explore different elements of this debate. Musculoskeletal disorders and symptoms do not form part of the diagnostic criteria, adopted in the UK by the HSE for hand-arm vibration syndrome

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TY - JOUR. T1 - Clonazepam and vibration in restless legs syndrome. AU - Montagna, P.. AU - Sassoli de Bianchi, L.. AU - Zucconi, M.. AU - Cirignotta, F.. AU - Lugaresi, E.. PY - 1984. Y1 - 1984. N2 - There have been no controlled therapeutic trials in Restless Legs Syndrome (RLS). In 6 patients with RLS, a randomized double-blind cross-over trial vs placebo showed a significant efficacy of clonazepam in improving subjective quality of sleep and leg dysaesthesia. Vibratory stimulation of the leg showed a less pronounced and non-significant effect. Clonazepam is a safe and effective drug for treatment of RLS; however its long-term efficacy needs confirmation.. AB - There have been no controlled therapeutic trials in Restless Legs Syndrome (RLS). In 6 patients with RLS, a randomized double-blind cross-over trial vs placebo showed a significant efficacy of clonazepam in improving subjective quality of sleep and leg dysaesthesia. Vibratory stimulation of the leg showed a less pronounced and ...

For environmental noise monitoring and building acoustics, Larson Davis offers a full line of instruments, accessories and software. For personal noise and vibration exposure monitoring, Larson Davis complements this with sound level meters, personal noise dosimeters, human vibration meters, audiometric calibration systems and hearing conservation programs.

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The analysis of acoustic wave fields is important for a large number of engineering designs, communication and health-related reasons. The visualization of wavefronts gives valuable information about the type of transducers and excitation signals more suitable for the test itself. This article is dedicated to the development of a fast procedure for acoustic fields visualization in underwater conditions, by means of laser Doppler vibrometer measurements. The ultrasonic probe is a focused transducer excited by a chirp signal. The scope of this work is to evaluate experimentally the properties of the sound beam in order to get reliable information about the transducer itself to be used in many kinds of engineering tests and transducer design.

We introduce a new examination method developed at the University Dermatology Hospital in T bingen in cooperation with the Institute for High Frequency Techniques of Aachen Technical College and the Metabo Factory in N rtingen, Germany. The T bingen workplace simulator for studying vibration white finger VWF syndrome generates standardized...

Piezoelectric cantilever working on direct piezoelectric effect has shown promising applications as a sensor as well as a micro-power generator depending on the amount of stress that is applied on the piezoelectric material at different range of frequencies. In this research, a self-powered accelerometer that consists of a wide-band energy harvesting power generator, a low operating frequency device acceleration sensor, and a signal conditioning circuit is designed. Piezoelectric cantilevers are being used in this research as a sensor to measure the vibration acceleration level and at the same time as a generator to power up the amplifier circuit. This research includes characterize the frequency response of the piezoelectric cantilever by altering its effective mass and length, design the selfpowered accelerometer system, and lastly verify the output of the self-powered system with battery powered system. The result shows that increasing the effective mass of the cantilever can reduce the ...

Significant Achievements, Anticipated Outcomes and Future Work Ethane, propane (liquified petroleum gas) and butane (lighter fluid) are the simplest model hydrocarbon fuel molecules that incorporate an internal rotation. The methyl torsional motion behaves like a vibration at low vibrational energies with a transition to a near-free rotor at high vibrational energies. Our simulations of collisions between these fuel molecules and rare gas atoms have shown that torsional motion acts as a gateway for energy transfer. The implication, for any future studies of larger fuel molecules (e.g. octane), is that simulations of collisional energy transfer must include the correct torsional dynamics. As part of these collisional energy transfer studies, we have developed a multiple direct-encounter hard-sphere model, which enables qualitative prediction of collisional energy transfer trends and behaviours, but at less computational cost than a full quantitative prediction. This will be be useful for future ...

Department of Energy Science and Engineering Indian Institute of Technology Bombay Powai, Mumbai - 400076, INDIA. © 2019 All rights reserved, IIT Bombay. ...

Hearing starts with the outer ear. When a sound is made outside the outer ear, the sound waves, or vibrations, travel down the external auditory canal and strike the eardrum (tympanic membrane). The eardrum vibrates. The vibrations are then passed to 3 tiny bones in the middle ear called the ossicles. The ossicles amplify the sound and send the sound waves to the inner ear and into the fluid-filled hearing organ (cochlea).. Once the sound waves reach the inner ear, they are converted into electrical impulses, which the auditory nerve sends to the brain. The brain then translates these electrical impulses as sound.. ...

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In this paper, a damage detection method based on a combination of wavelet analysis and an interval type-2 fuzzy logic system (IT-2FLS) is proposed. Firstly, synthesizing IT-2FLSs as a data-driven model is proposed. The structure is then divided into elements and excited to be vibrated to measure vibration signal. Average quantity signal of wavelet transform coefficient (AQWTC) of vibration signal with a used-scale-sheet is established. The IT-2FLS is utilized to identify the structure at its undamaged time via AQWTC signal. At each surveying time, AQWTC at each element is calculated to estimate difference of corresponding AQWTCs between two cases: undamaged status and the status at the checked time. By applying the AQWTCs contrast at two these times, a damage coefficient is described which is used to estimate status of the structure. Besides, in order to predict structures status, the time-series prediction using the IT-2FLS and the calculated damage coefficient are also presented. The ...

With the increasing depth and intensity of coal mining, the rockburst and correspondingly induced dynamic disasters are aggravating, which has been a serious threat to the safety of coal mines. According to reliable statistics, only 32 coal mines were characterized by rockburst danger until 1985 in China; unfortunately, by the end of 2014, nearly 147 coal mines were classified as rockburst tendency. Simultaneously, the mining depth of about 50 coal mines reaches or surpasses 1000 m. In the period of 2004-2014, more than 35 fatal rockbursts occurred, which cruelly killed over 300 workers and caused thousands of injures. In despite of lack of accurate data about rockburst in coal mines in other countries, we believe that the rockburst should be a ubiquitous dynamic phenomenon in deep coal mines in the world.. It has been verified that the mining-induced shock or vibration can easily trigger strong tremor and even cause rockburst disaster in high-stress concentration region by experimental and ...

The present invention relates to a bone conduction earset capable of blood point stimulation. More specifically, the bone conduction earset capable of blood point stimulation comprises: a body unit having a curved shape to be mounted along the head of a user; a first and a second bone conduction speaker unit which are coupled to both ends of the body unit to transfer a sound by vibration energy, and use the vibration energy to stimulate blood points at positions in contact; a first blood point stimulation unit to use first loss vibration energy lost in the vibration energy generated by the first bone conduction speaker unit to stimulate the blood points at the positions in contact; and a second blood point stimulation unit to use second loss vibration energy lost in the vibration energy generated by the second bone conduction speaker unit to stimulate the blood points at the positions in contact.

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The longitudinal vibration technique was examined as a means of predicting ultimate tensile strength and tension modulus of elasticity of finger join-ted tropical African hardwoods using three different finger pro- files. Modulus of elasticity measured using the longitudinal vibration technique (i.e, dynamic MOE) was. significantly correlated to static tension modulus of elasticity (i.e. tension MOE) for 10, 18 and 20 mm long finger profiles studied for Obeche (Triplochiton scleroxylon), Mnkore (Tieghemella heckelii) and Moabi (Baillonella toxisperma). Dynamic MOE was also significantly correlated to tension MOE for the com- bined data for each species, and for the three species. High correlation coefficient of r= 0.89 teas obtained for the regression of the combined data for the three species, and the regression model derived was also highly significant (a , 0.001). Correlation-between dynanmic MOE and ultimate tensile strength was, generally, higher than that between tension MOE and ultimate ...

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The fine craftsmanship of a spiders web helps these eight-legged arachnids catch their prey. But these silk-threaded designs can tell a spider a lot more than what they will be having for dinner. The spider that sits in the middle of its web monitors the silk threads for vibrations. And according to a new discovery by researchers at the Universities of Oxford, Strathclyde, and Sheffield the frequencies of these vibrations carry specific information about the prey, mates, and even the structural integrity of the web.

The standard STEDEF trackform was used, with a resilient pad placed under the sleeper and then encased in a rubber boot providing high flexibility and reassuring protection to control groundborne noise and vibration to levels below the applicable criteria. At the locations where the STEDEF system was not sufficient, floating slabs were implemented. In the majority of CHS, the predominant construction material is masonry. These buildings can be divided in two categories: ancient structures, where no mortar was used in the bed joints between the stones or marbles (dry construction), and historical ones, where mortar is used to connect the brick or stone blocks. The type of the load-bearing system of a building, the construction materials, the type of the foundation, the existence of a basement and the soil mechanical characteristics affect significantly the transmission of vibrations. The transfer of the waves between soil and building is a function of: (a) the coupling between soil and ...

This paper describes an electrical control method of absorbing arm vibrations of industrial robots. Arm vibration problems are divided into two categories: reso

Wichita State Universitys National Institute for Aviation Research is working with LMS to offer a ground vibration testing class June 17-20 at the National Center for Aviation Training.. The four-day Master Class provides an overview of the challenges and associated solutions for dynamic testing of full aircraft structures.. The master class rolls out an integrated approach to handle the test preparation, modal testing, modal analysis, numerical model correlation, model updating and model exploitation and will focus on practical implementation, combining classroom lectures with an actual ground vibration test of a Beechcraft C90 or similar size aircraft.. The topics to be covered in the GVT Master Class include:. ...

MAYTAG WASHING MACHINE FRONT LOADER, VIBRATION MY FRONT LOADER WASHING MACHIN, MAKING TOO MUCH VIBRATION WHEN IT - Maytag EPIC MFW9700S Front Load question

India has the highest number of diabetics in the world. A frequent complication of diabetes is nerve damage leading to distal symmetric neuropathy, which clinically manifests as loss of sensation in the feet, a major cause of foot ulcers and leg amputations in India.. The commonly used neuropathy diagnostic technology is the biothesiometer, which measures vibration perception threshold (VPT). The VPT is defined as the lowest intensity of vibration that a patient can feel in the sole of the foot. As opposed to stimuli that could potentially cause pain such as pin prick or heat, vibration is a harmless and painless stimulus that can be used to evaluate a persons sensation. Unfortunately, existing biothesiometers are large and heavy, mechanically and electrically inefficient, and require trained technicians to operate. These drawbacks make the biothesiometer impractical for low-resource settings in most parts of the world. Consequently, the majority of the Indian population with diabetes in rural ...

TY - JOUR. T1 - Structures, vibrational absorption and vibrational circular dichroism spectra of L-alanine in aqueous solution: a density functional theory and RHF study. AU - Frimand, K.. AU - Bohr, H.. AU - Jalkanen, K.J.. AU - Suhai, S.. PY - 2000. Y1 - 2000. M3 - Article. VL - 255. SP - 165. EP - 194. JO - Chemical Physics. JF - Chemical Physics. SN - 0301-0104. ER - ...

Nicu, V. and Neugebauer, J. and Wolff, S. and Baerends, E. 2008. A vibrational circular dichroism implementation within a Slater-type-orbital based density functional framework and its application to hexa- and hepta-helicenes. Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta). 119: pp. 245-263 ...

Industrial ultrasonics is an acoustic principle. Vibrations are turned into heat and thus the plastic material melts, which results in a homogeneous joint. Metals are joined through molecular bonding caused by the vibration. Let us explain the principles in detail and show you the large number of fascinating application options.. ...

A 4 : 1 (v/v) mixture of CD3CN and C6F6 was gelated by a chiral low-molecular weight gelator, N,N′-diperfluoroheptanoyl-1,2(R,R)- or -1,2(S,S)-diaminocyclohexanel. The process from a viscous isotropic solution to a stable gel was monitored by vibrational circular dichroism (VCD) spectroscopy. The transient VCD spec

2017-2022 Southeast Asia and Regional Vibrational Circular Dichroism Spectrometer Industry Production, Sales and Consumption Status and Prospects Professional Market Research Report

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Northeastern Chiropractic is one of the few health providers in New England to offer musculoskeletal rehabilitation using VibePlate™ The medical benefits and a

Beater wheel mills are designed to prepare a coal powder air fuel mixture for combustion in furnace chambers of coal-fired power plants by coal drying, pulverizing, classifying and transport. Their multipurpose function usually results in operation instability accompanied by unacceptable vibration. This usually is a significant problem due to unplanned shutdowns. Beater wheel mill maintenance program requires special attention due to operation under non-stationary conditions. The purpose of this paper was to identify pulverizing process parameter that affect the beater wheel mill vibration level and severity at the same time by using statistical principles under a wide range of operating conditions. This paper intends to establish the foundations to investigate correlation of pulverizing process parameter with beater wheel mill vibration in order to setup a better predictive maintenance program. To achieve this goal, the beater wheel mill vibration under different combinations of selected ...

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Usually, we use the 4-7 cmH2O backpressure level. This is the phonation threshold pressure (PTP) range which is an easy level for vocal fold vibration. We assume that the primary vibration (glottic wave) and secondary vibration (bubbling water) are in a kind of balance in the PTP range. To treat the glottic closure deficiencies, we use the high backpressure (which means between 10-35 cmH2O) in our therapy regimes. The lab research showed us that it is not possible to sustain glottic vibrations over 45 cmH2O. Of course, these numbers are to be considered within personal changes. The water bubbling provides a continuous (DC) backpressure with the water level and an additional vibratory (AC- alternant) backpressure by bubbling. To increase the DC backpressure it is possible to increase the water level, but it is not practical and hard to find a long bottle. The phonation tube should also be elongated. So this was the start for the DC-Valve devising process: Need is the mother of innovation. ...

Experimental and theoretical investigations of the vibration spectrum of λ-Hexanitrohexaazaisowurtzitane in the region of 0.2-2.5 terahertz are presented for the first time. The refraction index, absorption coefficient, and complex dielectric function of this sample are measured by terahertz time-domain spectroscopy. The simulated spectrum using density functional theory (DFT) is in agreement with the experimental data. The observed spectra features are assigned based on DFT calculation.. ©2006 Optical Society of America. Full Article , PDF Article ...