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BS EN 14253:2003+A1:2007 Mechanical vibration. Measurement and calculation of occupational exposure to whole-body vibration with reference to health.
Vibration White Finger or VWF is caused by the vibrations from power tools such as drills, chainsaws or hammers. Using such tools is common practice in many construction and industry working environments.. If you are suffering from vibration white finger as a result of your work, you may be entitled to compensation.. Vibration white finger can result in horrible symptoms, including constant pain in that hands which hugely reduce your quality of life, and it can stop you working for good in the job that you love. If youre worried about the financial implications of vibration white finger, you shouldnt hesitate to make a vibration white finger claim for compensation.. Your employer has a duty to protect you from injuries such as VWF and should have trained you accordingly to make you aware of the dangers and threats that are posed in these situations. If they have failed to do so, then they become liable for compensation claims against them.. If you have not been protected from VWF then Contact ...
I am very interested in new and unusual uses of sound and vibration, and the thought occurred to me: if a molecules temperature is the result of mechanical vibration, could an inverse frequency be applied so that the molecule is slowed (and therefore, cooled) via distructive interference? Could (or does) matching the molecules vibrational frequency result in more efficient heating ...
Mechanical vibration - Evaluation of machine vibration by measurements on non-rotating parts - Part 4: Gas turbine driven sets excluding aircraft derivatives
Mechanical Vibrations: Modeling and Measurement describes essential concepts in vibration analysis of mechanical systems. It incorporates the required mathematics, experimental techniques, fundamentals of model analysis, and beam theory into a unified framework that is written to be accessible to
Mechanical vibration and shock - Human exposure - Biodynamic coordinate systems (ISO 8727:1997, IDT) - SS-ISO 8727:2018This International Standard specifies anatomical and basicentric coordinate systems for biodynamical measurements, for reference purposes in cognate standard...
Sound • The human auditory system. • Noise and health Hearing damage risk. • Non-auditory health risks, vegetative responses. • Disturbance of speech communication Prediction. • Standards. • Annoyance at home and in other environments. • Sleep disturbance. • Planning and noise. Vibration • Principles of the measurement and evaluation of human vibration exposures. • Standards and Directives for whole-body vibration and hand-transmitted vibration. • Health effects of whole-body vibration. • Effects of whole-body vibration on activities. • Discomfort produced by whole-body vibration. • Vibration thresholds. • Building vibration. • Biodynamics (body transmissibility, apparent mass, models). • Seating dynamics (transmissibility, SEAT value, models). • Health effects of hand-transmitted vibration, their diagnosis, and prevention. • Measurement, evaluation, and assessment of the vibration of powered hand-held tools. • Causes of motion sickness in marine, land and ...
PURPOSE The present study was designed to investigate the electromyographic (EMG) response in leg muscles to whole-body vibration while using different body positions and vibration frequencies. METHODS Twenty male sport sciences students voluntarily participated in this single-group, repeated-measures study in which EMG data from the vastus lateralis (VL) and the lateral gastrocnemius (LG) were collected over a total of 36 trials for each subject (4 static positions × 9 frequencies). RESULTS We found that vibration frequency, body position and the muscle stimulated had a significant effect (P-values ranged from 0.001 to 0.031) on the EMG response. Similarly, the muscle × frequency and position × muscle interactions were significant (P | 0.001). Interestingly, the frequency × positions interactions were not significant (P | 0.05). CONCLUSIONS Our results indicate that lower frequencies of vibration (25-35 Hz) result in maximal activation of LG, whereas higher frequencies (45-55 Hz) elicit the
OBJECTIVES: Short-term whole-body vibration training (WBVT) has emerged as an exercise method for improving neuromuscular performance and has been proposed for injury prevention and rehabilitation. This study investigated the effects of a short-term (,/=2 months) WBVT program using a side-to-side vibration on: (i) strength profile of knee extensors (KE) and flexors (KF), (ii) "functional" hamstrings-to-quadriceps ratio (ECC(KF)/CON(KE)), (iii) flexibility and (iv) vertical jumping performance (VJ). Furthermore, we explored the retention of performance gains 21 days following WBVT. DESIGN: Randomized-controlled trial. METHODS: Twenty-six moderately active females (20.40+/-0.27 years) were assigned to a vibration (VG) or a control group (CG). The short-term WBVT program consisted of sixteen-sessions on a side-to-side vibration platform (frequency: 25Hz, amplitude: 6mm, 2 setsx5min). Isokinetic and isometric peak torque of KE and KF, ECC(KF)/CON(KE), flexibility, and VJ were measured pre, 2 days ...
There is general agreement that physical exercise can positively influence osteoporotic fracture risk along two pathways: first by reducing the risk of falls via an improvement of fall related neuromuscular abilities; second by increasing bone strength.. Whole body vibration (WBV) training has recently been proposed as a new approach for prevention and treatment of osteoporosis. Animal studies have shown evidence that WBV may be an effective method to improve bone mass, architecture and strength. However, the results of human WBV training studies are rather heterogeneous.. In the Erlangen Longitudinal Vibration Study II (ELVIS II), a randomized, controlled 12 month lasting study the investigators determine the effect of a thrice weekly WBV training on two different devices on the osteoporotic risk factors: bone mineral density, falls and neuromuscular performance. Particular the investigators compare a bipedal vertical oscillating Plate with a plate which rotates around a central axis leading to ...
Abstract. This work explored the short-term effect of whole body vibration (WBV) training on anthropometry, body composition and muscular strength in obese women. Fifty obese women (age=46.8±7.81[SD]y; BMI=35.1±3.55kg/m2) were assigned to a ten-week WBV training period, two times a week (in each session, 14min vibration training, 5min rest; vibration amplitude 2.0-5.0mm, frequency 40-60Hz), with (n=18) or without (n=17) radiofrequency, or to a non-exercise control group (n=15). Subjects were instructed not to change their habitual lifestyle. Before and after the ten-week experimental period, anthropometric measurements, dual-energy X-ray absorptiometry (DXA), and the leg press, leg curl and leg extension strength tests were carried out. All changes in the two groups of WBV training, with or without radiofrequency, were similar and these groups were combined in a single WBV intervention group. As compared to controls, subjects submitted to WBV training had significantly lower BMI, total body ...
This study is a randomized controlled trial aimed to assess the efficacy of a 10-week whole body vibration training program on physical functioning, societal participation and quality of life in individuals with chronic stroke. It is hypothesized that the whole body vibration program will induce significantly more gain in physical functioning, societal participation, and quality of life in chronic stroke patients, compared with the control group ...
National Instruments recently announced the latest version of its NI Sound and Vibration Measurement Suite software, which provides a comprehensive collection of analysis and signal processing tools for noise, vibration and harshness (NVH) testing, machine condition monitoring (MCM) and audio test applications. Engineers can use the suite as stand-alone software or combine it with NI hardware and NI LabVIEW system design software to simplify test system development and control. With its new vibration data-logging functionality and other enhancements, the Sound and Vibration Measurement Suite 2011 helps engineers to more easily customize and automate any MCM or NVH test or monitoring application.. The NI Sound and Vibration Measurement Suite is an integral part of our MCM applications, said professor Jay Lee, director of the National Science Foundations Industry/University Cooperative Research Center for Intelligent Maintenance Systems at the University of Cincinnati. The suite has ...
Progress in solving the problem of hand-arm vibration for chain saw operators in Sweden from 1967 to date is reviewed. When the National Swedish Testing Institute for Agricultural Machinery measured vibration in chain saws in 1974, the average vibration level of the chain saws used in Sweden had been reduced to 30 to 40 Newtons from some 150 Newtons in 1967 as a result of manufacturers technical
This pilot study was to examine the feasibility and tolerance of whole body vibration therapy (WBVT) for children and adults with moderate severity of cerebral palsy (CP) being graded as levels III or IV on the Gross Motor Function Classification Scale (GMFCS). Study participants received the additional WBVT when standing still on the vibration platform for three 3-min bouts of vibration (20 Hz, 2 mm amplitude), 4 days per week for 4 weeks. In addition to questions relating to feasibility and participants opinions, assessment at baseline and completion of the intervention included the Gross Motor Function Measure-66 Item Set (GMFM-66 IS), 2-min walk test (2MWT), Timed Up and Go test (TUG) and Pediatric Evaluation of Disability Inventory (PEDI). Wilcoxon Signed Ranks test was used to compare the results. Fourteen participants (mean age = 25.25 years SD 3.71; 9 males, 64%; GMFCS level III n = 13, 92%) were recruited and completed the study. The attendance rate was over 90% with no adverse events. All
Fat accumulates in the bone marrow of lumbar vertebrae with bed rest. Exercise with or without whole body vibration may counter this effect. Our objectives were to measure 1) the vertebral fat fraction (VFF) of men subjected to bed rest who performed resistive exercises with (RVE, n = 7) or without whole body vibration(RE, n = 8) or no exercise (CTR, n = 9) using three MRI techniques; and 2) changes in peripheral blood counts. Twenty-four healthy men (age: 20-45 yr) underwent -6 degrees head-down tilt (HDT) bed rest for 60 days. MRI was performed using three techniques (fat saturation, proton spectroscopy, and in and out of phase) to measure the fat fraction of L(3), L(4), and/or L(5) at baseline, mid-HDT, and end-HDT. Erythrocytes and leukocytes were counted at HDT days 19, 33, 47, 54, and 60. The mean absolute VFF was increased in the CTR group at mid-HDT and end-HDT (+3.9 +/- 1.3 and +3.6 +/- 1.2%, respectively, both P , 0.05). The RE group had a smaller VFF change than the CTR group at ...
Compare Whole Body Vibration (WBV) exercise fitness platform machines. Find the industrys best vibration exercise equipment for your home or gym. Dual motor and single motor units are available now. Get your own Whole Body Vibration machine today!
The main objective of the thesis is to propose the methods of determining vibration behavior of carbon nanotubes (CNTs) using continuum models and finite element models. Secondary objective is to find the effect of van der Waals force on vibration of multiwalled carbon nanotubes . The study of vibration behavior of CNTs is important because of their potential engineering applications such as nano-mechanical resonators and tips of scanning probe instruments where they are subjected to mechanical vibrations. Continuum modeling is based on an elastic beam model. The interlayer van der Waals interactions are represented by Lennard-Jones potential. In finite element modeling, single walled nanotubes (SWNTs) are modeled as finite beam elements and multi-walled nanotubes (MWNTs) as finite solid elements. The interlayer van der Waals interactions are simulated by distributed springs. The proposed finite element approach and continuum approach for vibration analysis of CNTs are verified by comparing the results
Non-contact testing is an important method for the study of the vibrating characteristic of cylindrical resonators. For the vibratory cylinder gyroscope excited by piezo-electric electrodes, mode testing of the cylindrical resonator is difficult. In this paper, a novel vibration testing method for cylindrical resonators is proposed. This method uses a MEMS microphone, which has the characteristics of small size and accurate directivity, to measure the vibration of the cylindrical resonator. A testing system was established, then the system was used to measure the vibration mode of the resonator. The experimental results show that the orientation resolution of the node of the vibration mode is better than 0.1°. This method also has the advantages of low cost and easy operation. It can be used in vibration testing and provide accurate results, which is important for the study of the vibration mode and thermal stability of vibratory cylindrical gyroscopes.
Ankle injuries are one of the most common injuries in sport, often leading to functional deficits and instability, a vicious cycle of recurrent sprains and time loss due to injury. Although research has been conducted on the best methods of treating such deficits and instability, new training methodologies are continually being sought to help improve clinical outcomes and with this comes a need for designed research to test such hypotheses. The purpose of the present research was to investigate the effect of vibration training on balance and muscle function in physically active individuals suffering self reported functional ankle instability (FAI). Stage one of the research was to initially investigate the effect of a six week whole body vibration training (WBVT) exercise routine on 38 University dancers reporting FAI. An initial assessment of the severity of the instability was done using the Cumberland Ankle Instability Tool (CAIT), to identify those who classed themselves functionally ...
Most who work on that probably likely have experience specifically in aeroelasticity rather than a previous focus specifically just on vibrations or just on aerodynamics. I am sure there are exceptions to that rule, but that would be the most common route. The field itself is certainly related to both solids/vibrations and aerodynamics and requires knowledge of both, though it does seem to skew slightly toward solids in my admittedly limited experience with the topic ...
In 2007, research funded by the National Space Biomedical Research Institute compared the effects of exercising on a Lineal machine with the same exercises performed on a Pivotal machine.. They found that in all the body postures they tested: "transmission of vibration to the head was 71 to 189% greater during vertical (Lineal) than rotational (Pivotal) vibration." and that "rotational (Pivotal) vibration has the lowest risk of negative side effects.". Abercromby, A., et al. Vibration Exposure and Biodynamic Responses During Whole Body Vibration Training. Med Sci Sports Exerc. 2007 Oct;39(10):1794-800.. Other researchers have reported the following damage caused by using low magnitude Lineal vibration:. ...
Whole Body Vibration: The Not-So-New Way to Train, As fitness professionals,we should always be looking for that next tool or training method that willhelp our clients achieve a higher level of success. Whole Body Vibration (WBV) notonly helps our clients achieve a higher level of fitness -- but it does it in ashorter period of time. Although WBV has been available for the personaltraining community for over a decade, it has yet to become a standard
Preface xv. Symbols xix. 1 Introduction: Basic Concepts and Terminology 1. 1.1 Concept of Vibration 1. 1.2 Importance of Vibration 4. 1.3 Origins and Developments in Mechanics and Vibration 5. 1.4 History of Vibration of Continuous Systems 8. 1.5 Discrete and Continuous Systems 11. 1.6 Vibration Problems 15. 1.7 Vibration Analysis 16. 1.8 Excitations 17. 1.9 Harmonic Functions 18. 1.10 Periodic Functions and Fourier Series 24. 1.11 Nonperiodic Functions and Fourier Integrals 26. 1.12 Literature on Vibration of Continuous Systems 29. References 29. Problems 31. 2 Vibration of Discrete Systems: Brief Review 33. 2.1 Vibration of a Single-Degree-of-Freedom System 33. 2.2 Vibration of Multidegree-of-Freedom Systems 43. 2.3 Recent Contributions 60. References 61. Problems 62. 3 Derivation of Equations: Equilibrium Approach 68. 3.1 Introduction 68. 3.2 Newtons Second Law of Motion 68. 3.3 DAlemberts Principle 69. 3.4 Equation of Motion of a Bar in Axial Vibration 69. 3.5 Equation of Motion of a Beam ...
In this case we finally got what we usually consider to be a true vibration. In fact that is the point of critical damping. As we increase the damping coefficient, the critical damping coefficient will be the first one in which a true oscillation in the displacement will not occur. For all values of the damping coefficient larger than this (i.e. over damping) we will also not see a true oscillation in the displacement.. From a physical standpoint critical (and over) damping is usually preferred to under damping. Think of the shock absorbers in your car. When you hit a bump you dont want to spend the next few minutes bouncing up and down while the vibration set up by the bump die out. You would like there to be as little movement as possible. In other words, you will want to set up the shock absorbers in your car so get at the least critical damping so that you can avoid the oscillations that will arise from an under damped case.. Its now time to look at systems in which we allow other external ...
books.google.comhttps://books.google.com/books/about/Mechanical_vibration_and_shock_measureme.html?id=ch0IAQAAIAAJ&utm_source=gb-gplus-shareMechanical vibration and shock measurements ...
books.google.comhttps://books.google.com/books/about/Mechanical_vibration_and_shock_measureme.html?id=ch0IAQAAIAAJ&utm_source=gb-gplus-shareMechanical vibration and shock measurements ...
The latest design from Confidence Fitness is the new Vibration Plate. This compact machine is the answer to low impact, easy exercise with fast results in your own home. With a user friendly display console and simple to navigate menu, will make even the most inexperienced gym goers comfortable in training immediately. The Vibration Plate enhances even the most casual of activities and maximises the potential of your normal fitness regime. Whether your aim is to reduce weight improving your fitness and flexibility, or build up your muscles the power plate trainer plus will help you reach your goals. Sitting, standing or even lying on the vibration plate while doing simple weight-bearing exercises allows the vibration to stimulate and amplify the exercise. The vibration plate creates a high frequency vibration which causes a stretch reflex within the body. This means that the muscles contract involuntarily so creating the effects of exercise without the exertion of conventional exercises. The ...
A treatment known as whole body vibration therapy significantly increases bone strength among adolescents with cerebral palsy, a new clinical trial from New Zealand shows. The results were presented Saturday at The Endocrine Societys 95th Annual Meeting in San Francisco.
See Our Vibra Therapy models , Questions?. Kurt Jackson,PT,PhD,GCS, is the neurology coordinator and Harold Merriman,PT,PhD,CLT is the general medicine coordinator for the Doctor of Physical Therapy Program in the Department of Health and Sports Science at the University of Dayton in Dayton, OH.. REFERENCES. 1. Abercromby AF, Amonette WE, Layne CS, et al. Vibration exposure and biodynamic responses during whole-body vibration training. Med Sci Sports Exerc. 2007;39(10):1794-1800.. 2. Jordan MJ, Norris SR, Smith DJ, Herzog W. Vibration training: an overview of the area, training consequences, and future considerations. J Strength Cond Res. 2005;19(2):459-466.. 3. Cardinale M, Bosco C. The use of vibration as an exercise intervention. Exerc Sport Sci Rev. 2003;31(1):3-7.. 4. Bosco C, Colli R, Introini E, et al. Adaptive responses of human skeletal muscle to vibration exposure. Clin Physiol. 1999;19(2):183-187.. 5. Nishihira Y, Iwasaki T, Hatta A, et al. Effect of whole body vibration stimulus and ...
MINNESOTA (AP) - Have you ever put your phone on vibrate and you feel it ring, but you come to find out that no one has called you after picking it up? You can relax because that sensation is known as phantom cell phone vibrations. In time the brain starts to over-anticipate, picking up all sorts of cues. So, for many people, the vibrations are felt when theyre walking, rubbing on a counter or putting on a seatbelt.. If youre in a situation where your pants are dragging against your skin, youre creating signals that are stimulating these vibration sensors that are being carried into the brain, Schrater said.. ...
Truck drivers suffer from numerous health issues, predominantly musculoskeletal disorders (MSDs) in the low back. These MSDs have been strongly associated with exposure to whole body vibration (WBV). This proposal will determine if reducing WBV exposure will improve the health and safety of trucker drivers in Washington State and the United States.. Amount Awarded: $253,525.00.. ...
All heart vibrations sensation - Are all heart vibrations sensation due to afib? No. Heart "vibrations" or palpitations are due to many different heart dysrhythmias. They occur whith extra heart beats called premature atrial or ventricular contractions, or rapid heart rates including normal tachycardia or abnormal supraventricular tachycardia. Atrial fibrillation is an irregularly irregular heart rhythm. Electrocardiograms or special monitors help define the rhythm type.
Who cannot use Whole Body Vibration (WBV)? Most adults from the physically fit to the sedentary can use WBV. While the following list of medical conditions is not complete, we strongly advise that you consult with your physician before using WBV if any of the following conditions apply to you. This does not mean that if you are suffering from any of the conditions on the list, you could never use WBV. In a number of cases, it is highly recommended to integrate vibration training in a treatment plan under the medical advice of a doctor, specialist, or physiotherapist. These cases include, but are not limited to: pregnancy, pulmonary embolism, acute hernia, discopathy, spondylolysis, acute thrombosis, severe diabetes, known neurological conditions, migraines, epilepsy, pre-existing deep vein thrombosis, cardiovascular disease, recent infections, pacemaker and implantable cardioverter defibrillators, those undergoing cancer treatments (chemotherapy/radiation) or who have tumors, known retinal ...
Objective: Occupational exposure to hand-transmitted vibration can result in damage to nerves and sensory loss. The goal of this study was to assess the frequency-dependent effects of repeated bouts of vibration on sensory nerve function and associated changes in nerves. Methods: The tails of rats were exposed to vibration at 62.5, 125, or 250 Hz (constant acceleration of 49 m/s(2)) for 10 days. T
The inner ear is an organ located deep within the temporal bone, which is the bone of the skull on both sides of the head above and to the sides of the outer ear. The inner ear has two main structures: the semicircular canals and the cochlea.. The semicircular canals do not contribute to hearing, but assist in maintaining balance as we move. The cochlea is the hearing organ of the inner ear, which is a fluid-filled structure that looks like a snail. The cochlea changes the mechanical vibrations from the tympanic membrane and the ossicles into a sequence of electrical impulses. Sensory cells, called hair cells, bend in the cochlea as the fluid is disrupted by the mechanical vibrations. This bending of the hair cells causes electrical signals to be sent to the brain by way of the auditory nerve. The cochlea is arranged by frequency, much like a piano, and encodes sounds from 20Hz (low pitch) to 20,000Hz (high pitch) in humans.. ...
Interference holography with a pulsed ruby laser is used as a tool for analyzing complex mechanical vibrations. With the aid of a moire technique, the combination of two interferograms taken in special, electronically controlled conditions yields the contribution to the vibration pattern corresponding to a single frequency. Quantitative analysis then follows the same lines as in ordinary holographic interferometry.. © 1983 Optical Society of America. Full Article , PDF Article ...
With our dedicated customer support team, 30-day no-questions-asked return policy, and our price match guarantee, you can rest easy knowing that were doing everything we can to save you time, money, and stress.. ...
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0051] If the controller 25 determines that the finger approaches or comes into contact with the operation surface 3, a command may be output to the vibration driving circuit 27 and drive current may be supplied to the coil 19 from the vibration driving circuit 27. Accordingly, vibration may be applied to the operation body 2. At this time, a pulse pattern corresponding to a continuous vibration may be called from the vibration pattern database 28 by the controller 25 and may be sent to the vibration driving circuit 27, so that a continuous vibration of which the amplitude F is parallel to the center line CL is applied to the operation body 2. That is, a continuous pulse, which may be stored in the vibration pattern database 28 and has a predetermined frequency, may be sent to the vibration driving circuit 27, so that continuing AC drive current is supplied to the coil 19. Accordingly, the operation body 2 may be continuously vibrated. Here, the continuous vibration means a state where it may be ...
Bureau Veritas has launched a new paperless solution which simplifies the process of assessing the exposure to Hand-Arm Vibration, supporting organisations in achieving compliance with UK and EU Directive.. VEMS (Vibration Exposure Management System) has been developed in-house by Bureau Veritas experts and helps clients to overcome the numerous challenges faced with vibration exposure assessment, especially for large organisations that have a lot of tools and equipment.. With VEMS, organisations can manage their regulatory requirements for health and safety vibration across the whole company, in one place, with automatic calculations for complete peace of mind.. This is in contrast to conventional manual paper systems which can be onerous and time-intensive, do not allow easy visibility across the business and can lead to mistakes being made or documents lost.. What are your obligations?. The Control of Vibration at Work Regulations 2005 place a duty on employers to reduce the risk to their ...
Monday, October 1, 2012 Vibration-induced white finger disease (VWF) is caused by continued use of vibrating hand held machinery (high frequency vibration ,50 Hz), and affects tens of thousands of people. New research published in BioMed Centrals open access journal Clinical Epigenetics finds that people with a genetic polymorphism (A2191G) in sirtuin1 (SIRT1), a protein involved in the regulation of endothelial NOS (eNOS), are more likely to suffer from vibration-induced white finger disease.. VWF (also known as hand arm vibration syndrome (HAVS)) is a secondary form of Raynauds disease involving the blood vessels and nerves of arms, fingers and hands. Affected fingers feel stiff and cold and loose sensation for the duration of the attack, which can be very painful. Loss of sensation can make it difficult to carry out manual activities. Initially attacks are triggered by cold temperatures but as the disease progresses attacks can occur at any time.. Little is known about what causes the ...
Abstract: The purpose of the current investigation was to assess the effect of an acute bout of whole body vibration (WBV) exercise on muscle force output and motor neuron excitability. Nineteen recreationally trained college-aged males were randomly assigned to a WBV (n = 10) or a sham (S, n = 9) group. The WBV group completed a series of static, body weight squats on a vibrating platform at 30 Hz and an amplitude of ~3.5 mm (vertical), whereas the S group performed the same series of exercises but without vibration. Measurements were performed before (Pre) and then immediately post-exercise (Imm Post), 8 minutes post-exercise (8-Min Post), or 16 minutes post-exercise (16-Min Post) during 3 different testing sessions. The measurements involved a ballistic isometric maximum voluntary contraction (MVC) of the triceps surae muscle complex and electrical stimulation of the tibial nerve for assessment of motor neuron excitability by analyzing H-reflex and M-wave responses (Hmax/Mmax ratio). ...
Abstract: For evaluation of vibration which is transmitted to a human body, it is desirable to measure the vibration on the surface at the point of contact with a human body. International standard ISO2631-2 describes measurement/evaluation methods of vibration in a house. In Japan, the ground vibrations caused by road traffic, factory facilities, and construction work have been regulated by law so that the life environment inside of a house can be kept in good condition. However, the regulation law is applied to vibrations measured on the ground surface. The magnitude of vibration on the floor of a house is usually estimated by adding a value of 5 dB to that on the ground surface. This value is a median value of the difference of magnitude of vertically frequency-weighted acceleration between the second floor of a wooden house and the ground surface near the house. The author will compare recently measured data with these data because the amplification value was obtained about 20 years ago and ...
Discover the science behind how whole body vibration training works, and whether it makes any difference to your fitness, muscle strength and weight loss.
The whirling vibration of the drill in the beginning of the drilling operation is experimentally investigated. Special attention is paid to how vibration develops as the drill proceeds into the workpiece. Three types of drills with different web thicknesses are used, and the characteristics and cause of the vibration are discussed. Whirling vibration, which has an elliptical orbit, is a self-exited vibration accompanied by a phase lag with respect to the revolution of the workpiece. The vibration energy is provided by the regenerative effect at the major cutting edge, while the chisel edge acts to dampen the vibration.. ...
This experiment is designed to assess cortical and neuromuscular mechanisms involved in control of leg muscles and how these are modulated by standing on a vibration platform. The study will help us to understand the effect of whole body vibration on the contribution of cortical function and reflex pathways to maintaining balance during quiet standing. This may have implications with regard to prescription of whole body vibration for enhancing exercise prescription that leads to improved function of lower leg muscles for young and older individuals. This may have important implications for optimisation of exercise for strength, endurance and balance. Volunteers will attend the lab on two occasions. During one visit they will undergo transcranial magnetic stimulation in a standing position with feedback about their muscle activation level, and without the feedback. They will then stand on the vibration platform for 5 minutes with breaks after each minute and repeat the brain stimulation tests. On ...
Introducing sources of axial vibration into an oilwell drillstring has the potential to improve the drilling efficiency. Vibration generator tools, such as drillstring agitators, are under development or in current use to excite the bottom-hole assembly (BHA) axially in order to increase power and weight at the bit, improve the rate of penetration (ROP), reduce drillstring-wellbore friction, and accelerate the cutting removal process. Enhanced drilling under the effect of intentional imposed vibration is called "vibration-assisted rotary drilling" or VARD. While potentially enhancing the drilling process, VARD tools can also excite many unwanted vibration modes of the drillstring. These unwanted vibrations can cause fatigue damage and failure of BHA components such as "measurement while drilling" (MWD) tools, bit and mud motors, and consequently, inefficient drilling. This motivates a study of the complex dynamic behavior of an axially excited drillstring. Transverse vibration is the most ...
This study was conducted to clarify the effects of vibration on the peripheral nerves. Rat tails were exposed to vibration (acceleration 56.9 m/s2, frequency 60 Hz, amplitude 0.4 mm for two or four hours daily, six days a week. The maximum motor conduction velocity (MCV), the amplitude of evoked response, and the motor distal latency were measured on rat tail nerves every two months. Thin sections of tail nerves were examined under the electron microscope after 200, 500, and 800 hours of vibration. Neurophysiological and ultrastructural changes in tail nerves increased with the dose of vibration. In the groups exposed to vibration the MCVs were significantly reduced after a vibration time up to 400 hours, whereas the motor distal latency was not delayed significantly until 600 vibration hours. The ultrastructural changes were (1) detachment of the myelin sheath from the axolemma, (2) constriction of the axon, (3) protrusion of the myelin sheath into the axon, (4) accumulation of vacuoles in ...
With Whole body vibration more muscle fibers (also known as motor units) are activated under the influence of vibration than in normal, conscious muscle contractions the muscles are incited more efficiently. The immediate effect of WBV is therefore that the muscles can be used quickly and efficiently, allowing them to produce more force.
The device we use consists of a micrometer-sized mechanical silicon beam", says prof. Simon Gröblacher, who works at the Kavli Institute of Nanoscience at the TU Delft and who led the team of researchers together with prof. Aspelmeyer. "The beam is patterned in such a way that its vibrations can be written onto laser pulses traveling through it and vice versa", Gröblacher adds. "The beam is initially cooled in a cryostat such that it has no vibrational energy left. We then use laser pulses that can either add or extract energy from the beam. First, a weak laser pulse pushes the nanobeam slightly, creating a single mechanical vibration, and at the same time releases a photon of different frequency. We then measure this excitation by using a second strong pulse and confirm that the mechanical motion is indeed quantized." For a classical oscillation this Hanbury Brown and Twiss experiment would result in autocorrelations larger than 1, indicating that the energy of the wave packages is split. ...
The paper proposes a control scheme for detecting and compensating the low-frequency vibrations in hard disk drive systems. A vibration detector is propose
Users of the Live Vibe whole body vibration platform include, but are not limited to; athletes, at-home use, public and private health clinics, resorts...
A sensible body vibrator has a vibration unit mounted in a human body support such as a bed or a chair and adapted to generate mechanical vibrations upon receipt of a low-frequency signal. The inputting of various kinds of signals (including a low-frequency signal from an acoustic device, a pleasant sleep signal for inducing the user to pleasant sleep, an awakening signal for generating a signal at a preset time, a signal for transmitting a routine time schedule to particularly the deaf and dumb, a security signal for detecting and announcing the entry of an intruder entering a house through a door or a window or by climbing a wall, an emergency signal for announcing an emergency situation at the time of an emergency such as a fire, and similar other signals) is selectively controlled. The emergency signal is given priority over the other signals when the emergency signal is input.
The present paper talks about the free vibration analysis of simply supported Single- and Double-Walled Carbon Nanotubes (SWCNTs and DWCNTs). Refined 2D Generalized Differential Quadrature (GDQ) shell methods and an exact 3D shell model are compared. A continuum approach (based on an elastic three-dimensional shell model) is used for natural frequency investigation of SWCNTs and DWCNTs. SWCNTs are defined as isotropic cylinders with an equivalent thickness and Young modulus. DWCNTs are defined as two concentric isotropic cylinders (with an equivalent thickness and Young modulus) which can be linked by means of the interlaminar continuity conditions or by means of van der Waals interactions. Layer wise approaches are mandatory for the analysis of van der Waals forces in DWCNTs. The effect of van der Waals interaction between the two cylinders is shown for different DWCNT lengths, diameters and vibration modes. The accuracy of beam models and classical 2D shell models in the free vibration analysis of
Prior studies in mice have shown that whole body vibration (WBV) can mimic some of the positive effects on health of exercise, and even reverse some of the symptoms of type 2 diabetes. New research by a team at the Medical College of Georgia (MCG) and Dental College of Georgia (DCG) at Augusta University has provided new clues as to the mechanisms involved. Their studies in a mouse model of obesity showed that WBV results in increased levels of inflammation-suppressing immune system macrophages, and high numbers of gut bacteria that makes short-chain fatty acids (SCFAs), which can help the body better utilize glucose.. The findings "… support the notion that WBV has the potential to alter the microbiota in a way that triggers innate and mucosal immunity to produce anti-inflammatory responses, down-regulating the hyper-inflammatory state and reversing the adverse consequences," the investigators wrote in their published paper in the International Journal of Molecular Sciences. "More studies are ...
List of Linear Velocity Vibration Measurement Instruments and Vibration Analyzers Product Specs, Datasheets, Manufacturers & Suppliers
A vibration recorder (1000) for detecting leaks in a pipeline network (1010) includes a sensor (1000) operable to receive vibration signals from a pipeline network, and a communication port connected to an automatic meter reader/transmitter (1015). A processor connected to the communication port and to the sensor (1000) is programmed to process the vibration signals and to send data regarding the processed vibration signals to the AMRT using the communication port. The vibration recorder may also include metering actions, and, in some implementations, may incorporate the functions of the AMRT.
This paper presents new results regarding damping of structural vibrations using the elastic wedge method. An elastic wedge is a plate, or a rod, whose thickness decreases smoothly towards zero. Flexural vibration energy accumulates at the thinner edge and thus, effective damping can be easily achieved. The method has been proposed to reduce flexural vibrations of structures in the high frequency range, like vibration of turbine blades. In this research, the application of the elastic wedge method to reduce structural vibration in low frequency ranges is investigated using FEM. The structure under analysis is a heavy machinery bed structure. Two rod elastic wedges are attached to that bed. The target frequency range to be damped is between 150 and 250Hz. The results show that the elastic wedge method can effectively reduce the structural vibration of the bed in the target frequency range. Moreover, it was also found that, contrary to results previously published, for the researched structure ...
A laser Doppler vibrometer (LDV) is a scientific instrument that is used to make non-contact vibration measurements of a surface. The laser beam from the LDV is directed at the surface of interest, and the vibration amplitude and frequency are extracted from the Doppler shift of the reflected laser beam frequency due to the motion of the surface. The output of an LDV is generally a continuous analog voltage that is directly proportional to the target velocity component along the direction of the laser beam. Some advantages of an LDV over similar measurement devices such as an accelerometer are that the LDV can be directed at targets that are difficult to access, or that may be too small or too hot to attach a physical transducer. Also, the LDV makes the vibration measurement without mass-loading the target, which is especially important for MEMS devices. A vibrometer is generally a two beam laser interferometer that measures the frequency (or phase) difference between an internal reference beam ...
Testing of protective sensation and vibration perception are two of the most commonly used non-invasive methods of screening for diabetes-related peripheral neuropathy (DPN). However, there is limited research investigating the reliability of these tests in people with diabetes. The aim of this study was to determine the inter- and intra-rater reliability of methods used to test vibration perception and protective sensation in a community-based population of adults with type 2 diabetes. Three podiatrists with varying clinical experience tested four- and 10-site, 10 g monofilament and vibration perception threshold (VPT). In a separate cohort, the reliability of a graduated tuning fork as well as two methods of conventional tuning fork (on/off method and dampening method) was undertaken by a new graduate podiatrist and podiatrist with one-years clinical experience. The intra- (Cohens К) and inter-rater (Cohens or Fleiss К) reliability of each test was determined. Fifty participants (66% male, 100%
vibration at 50km/30mi/hr I had all three u-joints replaced and now I have noticed a vibration at 50 km/hr. Had - GMC 2002 Sierra 1500 question
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In this article I hope to share some basic information backed by evidence as a guide for consumers when purchasing a Whole Body Vibration machine.
At Body By Roni, we take a holistic approach to health, wellness and fitness. We offer a variety of amenities including the Whole Body Vibrations machine.
Vibration white finger primarily affects those who work in industries which require the use of power tools, such as concrete vibrators.
Daily sessions of whole-body vibration may combat prediabetes in adolescents, dramatically reducing inflammation, average blood glucose levels and symptoms such as frequent urination, researchers report.
This 48-page manual was developed following EASAs 12-part Vibration for Service Centers webinar series. It serves as an introductory training resource for service center technicians and supervisors involved in measuring, evaluating, and correcting vibration and balancing issues on machines under repair - as opposed to the in-plant predictive maintenance tasks covered in most general classes on the subject.. This document is intended as basic introductory training material for anyone who may be involved in evaluating or correcting vibration issues on machines repaired in the service center. Only certain sections may be of interest depending on the area and amount of involvement in vibration issues.. For a technician with responsibility for analyzing and correcting vibration and balancing issues, a general understanding of all of the information is essential. For technicians who will conduct field vibration and balancing services in customers facilities, additional training is strongly ...
Quickly perform a vibration analysis and evaluate alignment with Flukes vibration sensors testing and laser shaft alignment equipment and systems. | vibration monitoring tools |vibration measurement equipment | vibration measuring equipment
Basically, there are 3 ways of reducing noise: mass-loading, isolation/decoupling, and diffusion. Mass-loading and isolation work best on mechanical vibrations and work by absorbing them and preventing them from transferring to other areas of the case. Suspending a hard drive is one way of achieving this. Mass-loading a case panel will achieve this effect as a greater mass requires more energy to vibrate than a lesser mass. Therefore, with a given amount of vibrational energy a heavier object will vibrate less and its vibrations will be lower in frequency (which tends to make it harder to hear ...
Covers the fundamentals of mechanical vibration and rotordynamics as well as their main numerical models and analysis methods for vibration prediction
Acute vibration causes vasoconstriction in naïve human subjects1. Vibration-induced decrease in skin perfusion has also been reported in the rat-tail vibration model 2. After vibration exposure, rat-tail arteries demonstrate vacuoles in smooth muscle cells, similar to that caused by pharmacological vasoconstrictors3. This study addressed the effects of different frequencies, durations and patterns of vibration on lumen size and vacuole formation using the rat-tail vibration model in male Sprague-Dawley rats (~300 g). Methods The different groups were: 4-hr continuous vibration at 30, 60, 120 and 800 Hz; continuous exposure durations of 5 min, 1 hr and 4 hr at 60 Hz; and 4-hr cumulative exposure of 60 Hz delivered intermittently in cycles of 10 min on and 5 min off. Acceleration was set at 49 m/s2 r.m.s. for all frequencies. Unanesthetized rats were restrained in cages on a nonvibrating platform with their tails placed on a vibrating stage driven by a B&K motor (4809). The sham control animals ...
Systems with side alternation usually have a larger amplitude of oscillation and a frequency range of about 5 Hz to 40 Hz. Linear/upright systems have lower amplitudes but higher frequencies in the range of 20 Hz to 50 Hz. Despite the larger amplitudes of side-alternating systems, the vibration (acceleration) transmitted to the head is significantly smaller than in non side-alternating systems (Abercromby et al. 2007[36]) while at the same time muscle activation even at identical vibration parameters are increased in pivotal systems.[37] Mechanical stimulation generates acceleration forces acting on the body. These forces cause the muscles to lengthen, and this signal is received by the muscle spindle, a small organ in the muscle. This spindle transmits the signal through the central nervous system to the muscles involved (Abercromby et al. 2007,[36] Burkhardt 2006[38]). Power Plate is a brand of vibrating platform consisting of a vibrating base, which may vibrate up and down approximately 1 to ...
Vibration and noise are natural processes in the machines and equipment and they are excited by the same dynamic forces that are the reasons of the wear and different types of defects. Naturally, the vibration and noise transform from one into another on the border of gas and solid states, but the human being directly perceives only noise and only in limited low frequency range the vibration. The oscillation velocity is responsible for the transformation of the vibration into noise. The inflationary pressure in air is proportional to the velocity of the oscillation surface. That is why the standards as, a rule, limit the oscillation velocity of the machines and equipment. But the vibration control and vibration diagnostics are different practical problems. In diagnostics the defect is defined by the oscillation force that is applied to the defective zone and the force is linear connected with the oscillation acceleration but not with its velocity. So for diagnostics more often the vibration ...
Sensing of vibrations is generally related to the propagation of noise. The bearing, however, is usually not the source of noise. Noise is just an audible effect of vibrations that are caused either directly or indirectly by the bearing on related components. It is the reason why the majority of noise-related issues are associated with vibrations of the bearing itself or the entire housing.. The number of rolling elements, which carry the load, changes during operation in radially loaded bearings. This effect causes a displacement in the direction of the load. While the resulting vibrations cannot be prevented, they may be reduced by introducing an axial preload that ensures loading of all rolling elements.. Roll-over of damaged bearing components occurs in cases of local damage to raceways or rolling elements, resp., which occurs during improper handling or incorrect installation, and it leads to vibrations. The source of vibrations (damaged component) can be determined using vibration ...
vibrations - MedHelps vibrations Center for Information, Symptoms, Resources, Treatments and Tools for vibrations. Find vibrations information, treatments for vibrations and vibrations symptoms.
They find in a study of diabetic and healthy mice that vibration may work as well as regular exercise in helping to improve blood sugar control
China Vertical Vibration Simulation Test Equipment (YEV-11), Find details about China Vibaration Tester, Computer Control Vibration Test Machine from Vertical Vibration Simulation Test Equipment (YEV-11) - Dongguan Yuanyao Electronics Technology Co., Ltd.
This paper presents a study of employing tool rotation-induced vibrations in incremental sheet forming (V-ISF) to produce sheet metal parts with laminated ultrafine-grained structures. Non-axisymmetric tools were developed to generate tool vibration and surface shear deformation of sheet material during forming. Using the V-ISF process, magnesium sheets of AZ31 were formed to the hyperbolic cones and laminated ultrafine grains with higher micro hardness were obtained by tool generated low frequency vibrations with large amplitudes. To further investigate surface shear deformation induced during processing, the hole-deformation analysis of samples cut from the formed hyperbolic cones was performed. This study found that large surface shear deformation of the sheet and the tool vibration during incremental forming are the two key factors for the formation of laminated ultrafine grains. The developed V-ISF process has a great potential to produce sheet metal parts with refined grains and greater ...
vibration can either cause permanent physical damage or disturb the nervous system Hand arm vibration is experienced through the hand and arm Daily exposure to hand arm vibration over a number of years can cause permanent physical damage usually resulting in what is commonly known as white finger syndrome or it can damage the joints and muscles of the wrist and or elbow As in the case for noise induced hearing loss this white finger syndrome is often diagnosed when it is too late to do anything Early symptoms are white fingers in cold weather followed by permanent loss of feeling and dexterity A lot of research and studies have been made to evaluate the effect of overexposure to human vibration especially in the working environment The results have been used to establish international standards that allow human exposure to vibration to be evaluated The standards involve measurements of whole body vibration and hand arm vibration using instruments that fulfil the requirements of the standards ...
OBJECTIVE: This study focuses on the acute effects of vibration and how vibrations influence the measures of the thermal perception thresholds during different vibration magnitudes, frequencies, and durations. METHODS: The fingers of ten healthy subjects, five males and five females, were exposed to vibration under 16 conditions with a combination of different frequency, intensity and exposure time. The vibration frequency was 31.5 and 125 Hz and exposure lasted between 2 and 16 min. The energy-equivalent frequency weighted acceleration, according to ISO 5349-1, for the experimental time of 16 min was 2.5 or 5.0 m/s(2) (r.m.s.), corresponding to a 8-h equivalent acceleration, A(8) of 0.46 and 0.92 m/s(2), respectively. A measure of the thermal perception of cold and warmth was conducted before the different exposures to vibration. Immediately after the vibration exposure the acute effect was measured continuously on the exposed index finger for the first 75 s, followed by 30 s of measures at ...
On raising your vibrational frequency. I get a whole lot of inquiries to help people raise their vibration. And there are many individuals who offer this ... many video clips on youtube.. Whatever mode of raising your vibration to pick, you want to decide a few things ahead of time.. Some of the most important and most sobering steps is finding out what is your vibration when you start.. There are well-meaning individuals out there who will measure your vibration, however they do it.. According to their findings you could be in the Unconditional Love zone .... But my experience with individuals is that their vibration is more in the neighborhood of suffering, anger, and pride, than in the Unconditional Love zone .... It is, in my expert opinion, not valuable to know merely your vibration value, people also call it vibrational frequency.. Why? Because your single indicator will not say a great deal.. It is a whole lot the same as if I wished to assist you to a healthier lifestyle, but all I would ...
Scientists at the University of Illinois have developed a technology that provides higher resolution and more versatility in e-jet printing. As opposed to conventional ink-jet printers, where heat or mechanical vibrations are used to mobilize the ink stream, e-jet printers ... ...
For sale: Adapted Easystand 5000 to fit the vibration plate. VibraFlex Home Edition 2 vibration plate (Galileo in Europe) -- one of the best vibration plates on the market. Fully adapted and ready to go, in excellent working condition. Used it for years without any problems. It actually increased my bone density. Asking price: $7,500 (buyer is responsible for pickup or shipping cost, might be significant. the items are large and heavy).
Ankle injuries are one of the most common injuries in sport, often leading to functional deficits and instability, a vicious cycle of recurrent sprains and time loss due to injury. Although research has been conducted on the best methods of treating such deficits and instability, new training methodologies are continually being sought to help improve clinical outcomes and with this comes a need for designed research to test such hypotheses. The purpose of the present research was to investigate the effect of vibration training on balance and muscle function in physically active individuals suffering self reported functional ankle instability (FAI). Stage one of the research was to initially investigate the effect of a six week whole body vibration training (WBVT) exercise routine on 38 University dancers reporting FAI. An initial assessment of the severity of the instability was done using the Cumberland Ankle Instability Tool (CAIT), to identify those who classed themselves functionally ...
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This invention pertains to induced vibration and the dampening of these vibrations in the motor means. Vibration induced by rotating a shaft having eccentric weight thereon has been used to produce all kinds of shaking apparatus including large car shakers in which the induced force may be as much as eight thousand two hundred pounds. These vibrations can be as much as five thousand six hundred vibrations per minute and can be used for huge bins and hoppers in which the capacity may be as much as one hundred fifty thousand pounds. Vibrators using air, electric or hydraulic motors can be tuned or adjusted to provide the desired results. Most of these vibrators using a tuned motor may be temporarily or permanently attached. Motor driven vibrators, as far as is known, transmits the vibrational force into the shaft of the motor. Said motors, which are usually standard off-the-shelf units have their rotor bearings designed for rotary motion rather than combined with or added vibratory force. This added
A vibration driven motor or actuator has a piezoelectric element, arranged in a vibrating member, for generating a vibration in a first direction, and another piezoelectric element, arranged in the vibrating member, for generating a vibration in a second direction different from the first direction. In the motor or actuator, the vibrating member has a recess portion which shaved e.g., by a laser, or a portion added with a mass, so that the natural frequencies of a given vibration mode of the vibrations in the first and second directions coincide or substantially coincide with each other.
This paper introduces an indirect train traffic monitoring method to detect and infer real-time train events based on the vibration response of a nearby building.Monitoring and characterizing traffic events is important for cities to improve the efficiency of transportation systems (e.g., train passing, heavy trucks, traffic). Most prior work falls into two categories: 1) methods that require intensive labor to manually record events or 2) systems that require deployment of dedicated sensors. These approaches are difficult and costly to execute and maintain. In addition, most prior work uses dedicated sensors designed for a single purpose, resulting in deployment of multiple sensor systems. This further increases costs. Meanwhile, with the increasing demands of structural health monitoring, many vibration sensors are being deployed in commercial buildings. Traffic events create ground vibration that propagates to nearby building structures inducing noisy vibration responses. We present an information
In response to SBIR topic A07-023, Impact Technologies, collaborating with Allient Techsystems, Incorporated (ATK), proposes to develop and demonstrate a modular embedded vibration management platform for the collection, signal processing, real-time analysis, and reduction of vibration data. The proposed asset-mounted sensor will be capable of long term autonomous collection and analysis of vibration data from an integral multi-axis accelerometer. The authors significant vibration experience will be used to modify existing analysis techniques for the sensors real time processing. All saved data and processing results will be transferable to an external system via an onboard USB port for further post processing. The authors will adapt existing Impact-developed embedded data acquisition systems for use in this program or utilize COTS components whenever possible. Impact is well positioned to leverage their experience and knowledge of vibration measurement systems in order to develop a ...
There are growing demands for condition monitoring of IC engines, and therefore any method in order to improve the performance of the engines ought to be evaluated. This paper proposes a new approach for the prediction and optimisation of noise and exhaust emissions in IC engines.The idea is to reconstruct the cylinder pressure from vibration measurements on the engine surface by using the complex cepstrum method [3, 4]. The reconstructed cylinder pressure is further used as input in Multivariate models, based on cylinder pressure, for estimating noise and exhaust emissions. This paper demonstrates the applicability of the method for modelling of noise and exhaust emissions ...
Soon you may be hearing a lot about low-intensity vibration therapy for strengthening bones and reducing the risk of fractures. Two low-intensity oscillating…
A less strenuous form of exercise known as whole-body vibration (WBV) can mimic the muscle and bone health benefits of regular exercise in mice, according to a new study published in the Endocrine Societys journal Endocrinology.
We report an exciting behavior of H-shaped single layer graphene structures subject to a heat flux. H-shaped graphene structures with certain particular dimensions were observed to be able to establish coherent mechanical vibrations in the out-of-plane direction directly from a steady state heat flux flowing
Im a 44 year old male who, for the past week, has experienced a humming/vibration sensation in my left thigh/groin area, akin to the vibrate mode on a cell phone. The sensation is intermittent. It i...
78069 avhandlingar från svenska högskolor och universitet. Avhandling: Imbalance and fractures in the elderly Effects of decreased vibration sensation and vestibular asymmetry.
Will anything tangible ever culminate from this dense pressure/vibration sensation in my pineal gland area? - Mystic Banana - New Age Spirituality Magazine
In addition to the traditional topics of mechanical vibrations and waves, coupled oscillators, and electro-magnetic radiation, students will also learn about...
In addition to the traditional topics of mechanical vibrations and waves, coupled oscillators, and electro-magnetic radiation, students will also learn about...