RMS (Reliability-Maintainability-Safety-Supportability) engineering is emerging as the newest discipline in product development due to new credible, accurate, quantitative methods. Weibull Analysis is foremost among these new tools. New and advanced Weibull techniques are a significant improvement o
Tõstevõimsus: 3000 kg Tõsteulatus: 3 m Keti paksus: 10 mm Käepideme pikkus: 410 mm Tõstekonksu kida: 40 mm Min. pikkus: 480 mm Mass: 21 kg
Peak principal stresses as a function of the degree of stenosis. All simulations were performed using a fixed degree of stenosis of 70% and at 160 mmHg blood pr
This chapter reviews of some important fundamentals of statics and mechanics of solids, the concept of stress, modes of load transmission, general sign convention for stress and force resultants, and analysis and design principles; as well as a discussion of treatment for changing the components of the state of stress given in one set of coordinate axes to any other set of rotated axes, as well as variation of stress within and on the boundaries of a load-carrying member.
The operation of distribution system with the components in deteriorating condition makes the system reliability worsen. It is important to find the solution for balancing failure cost and maintenance benefits such as down-time and reliability. In this paper, time to replace the components in optimum condition based on constant-interval replacement mode is investigated. The optimal replacement time is mainly depended on components reliability and the cost ration of preventive replacement and failure replacement. In this paper, equipment inspection method and Weibull Analysis is applied to obtain the accurate reliability estimation. Weibull Analysis is applied with constant-interval replacement model to investigate the optimum replacement time for each component considering the different cost ratios. According to the quantitative results, the determination of the optimal replacement time (OPT) can minimize the total downtime and failure cost. Consequently, the reliability of the system is maximized and
TY - JOUR. T1 - Effect of thermocycling on shear bond strength of glass ionomer cements. AU - Ballal, Nidambur Vasudev. AU - Paulson, Liz. AU - Ginjupalli, Kishore. AU - Ozcan, Mutlu. PY - 2019/1/1. Y1 - 2019/1/1. N2 - To evaluate the effect of thermocycling on shear bond strength of Fuji IX glass ionomer cement and a novel glass ionomer cement (Ketac Universal) to dentin. A total of 40 extracted human molars were divided into 4 groups (n = 10). The occlusal surfaces were ground flat to expose dentin using diamond discs. Dentin surfaces were treated according to manufacturers instructions, and restorative materials were applied onto a plastic mold of 3mm height and 4mm diameter. The shear bond strength of Ketac Universal and conventional Fuji IX glass ionomer cements was evaluated after 24 h using Instron Universal Testing Machine at a crosshead speed of 0.5 mm/min before and after the specimens were subjected to thrmocycling. There was no statistical difference in the shear bond strength of ...
This study evaluated the stress distribution based on the canine pillar geometry in human skull, using a finite element analysis. Computed tomography of human skull was used to build a finite element model, which was composed by all bony structures of canine pillar: canine eminence, canine fossa, frontal process of maxilla, glabellum and superciliary arch. A support on the bite contact of maxillary canine tooth and a resultant force of the masticatory muscles was applied in the simulation. Equivalent Von-mises and maximum principal stresses were analyzed along the structures that compose the canine pillar geometry. Von-mises stress presented high stress concentrated at the canine fossa and frontal process of maxilla. Maximum principal stress showed compression areas at the canine fossa and part of frontal process and tensile stress at canine eminence and part of the frontal process. In conclusion, the different stress areas means different force concentrations transmitted along the canine pillar ...
The push-out test has been widely performed to measure the bond strength of intracanal materials in dentistry. However, it is difficult to compare equitably the bond strengths from different testing specimens. The aim of this study was to investigate
A photoelastic stress multiplier is proposed which can perform the multiplication of two stresses or voltages using two cascaded photoelastic modulators. This new multiplier has potential applications in many interdisciplinary fields.. © 2006 Optical Society of America. PDF Article ...
ANSYS structural analysis software includes advanced nonlinear stress simulations and comprehensive linear dynamics for finite element modeling.
Hello I am using ANSYS for structural ANALYSIS, I want to add PML or absorbing boundary condition in my simulation: I have a look at help of ansys, there is absorbing boundary for Electermagnetic domain , Structural fluid ,... I am not able to find the absorbing boundary condition only for structural domain . Please can sb help me to know that I can add absorbing boundary condition for structural domain in ANSYS? the second question:when I want to add complex value as an input how it will be possible in ANSYS, ...
A random selection of accounting firms from three regions is taken and they are asked to state the starting salary for a new accounting graduate. Do a one-way ANOVA to analyze these data using a 1% level of significance:.
Saint-Gobain® manufactures the largest seamless heat shrinkable rollcovers in the world featuring the best time-tested surface treatment available for maximum bond strength.
It is our objective at Instron to provide our customers the best ownership experience by delivering the highest quality products, expert support and world-class service.". ...
How do you define the allowable limits of a polymer? One suggestion I heard recently was to take the yield stress at a 10 % proof stess point and then
TY - JOUR. T1 - Shear bond strength of the Tenure Solution dentin bonding system.. AU - Barkmeier, Wayne W.. AU - Cooley, R. L.. PY - 1989/10. Y1 - 1989/10. N2 - A liquid solution of an oxalate bonding system containing NTG-GMA and PMDM has become commercially available. The bond strength of this oxalate adhesive (Tenure Solution) to dentin was determined by bonding composite resin cylinders to extracted teeth. The bond strengths obtained in this study are compared to the bond strengths obtained in earlier studies with the first and second generation oxalate adhesives whose components were supplied as powders and required mixing. The oxalate solutions developed significantly higher bond strengths than the original powder type systems.. AB - A liquid solution of an oxalate bonding system containing NTG-GMA and PMDM has become commercially available. The bond strength of this oxalate adhesive (Tenure Solution) to dentin was determined by bonding composite resin cylinders to extracted teeth. The ...
TY - JOUR. T1 - Comparative evaluation of shear bond strength of two nanofilled posterior composites as core build up materials. T2 - An in vitro study. AU - Ganerhiwal, Shakshi. AU - Gupta, Chandni. AU - Kundabala, M.. AU - Ginjupalli, Kishore. AU - Shenoy, Ramya. PY - 2016/9/1. Y1 - 2016/9/1. N2 - Core build up is necessary as a foundation for post endodontic restorations when the tooth structure is severely damaged, fractured or extensively carious. Core build up material should provide resistance and retention form for the coronal restoration and possess sufficient strength to resist occlusal forces. An ideal core build-up material should have physical properties similar to those of tooth structure where the occlusal biting loads are transferred to dentin. The study evaluated and compared the shear bond strength of two nanofilled resin composites Group A - Filtek Z350 XT and Group B - Filtek Bulk fill) as core build up materials. Eighteen extracted permanent human molar teeth were sectioned ...
TY - JOUR. T1 - Glass-ionomer restoratives and liners. T2 - shear bond strength to dentin.. AU - Bell, R. B.. AU - Barkmeier, Wayne W.. PY - 1994. Y1 - 1994. UR - http://www.scopus.com/inward/record.url?scp=0028692912&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0028692912&partnerID=8YFLogxK. M3 - Article. C2 - 7803139. AN - SCOPUS:0028692912. VL - 6. SP - 129. EP - 134. JO - Journal of Esthetic and Restorative Dentistry. JF - Journal of Esthetic and Restorative Dentistry. SN - 1496-4155. IS - 3. ER - ...
Reed and wheat straw particleboards bonded with urea formaldehyde (UF) resin were manufactured from two different material configurations (i.e., fine and coarse particles). The board densities were in the range of 0.550-.90g/cm3. The effects of particle size and board density on the board properties were examined. The properties of particleboard produced from fine particles were better than those made from coarse particles. An increase in board density resulted in a corresponding improvement in the board properties. The properties of OF bonded reed and wheat straw particleboards were relatively lower than those of commercial particleboards. Three silane coupling agents were used to improve the bondability between the reed and wheat particles and OF resin. Results of this study indicate that all the board properties were improved by the addition of silane coupling agent. The degree of improvement achieved from each coupling agent was different; epoxide silane was found to be more effective for reed straw
Materials and Methods: Buccal enamel of 80 bovine teeth was submitted to finishing and polishing with metallographic paper to a refinement of #600, in order to obtain a 5-mm2 flat area. Blocks (2 x 4 x 4 mm) of laboratory composite resin were cemented to enamel according to different protocols: (1) untreated enamel + RelyX Unicem cement (RX group); (2) untreated enamel + Bifix SE cement (BF group); (3) enamel acid etching and application of resin adhesive Single Bond + RelyX Unicem (RXA group); (4) enamel acid etching and application of resin adhesive Solobond M + Bifix SE (BFA group). After 7 days of storage in distillated water at 37°C, the blocks were sectioned for obtaining microbar specimens with an adhesive area of 1 mm2 (n = 120). Specimens were submitted to the microtensile bond strength test at a crosshead speed of 0.5 mm/min. The results (in MPa) were analyzed statistically by ANOVA and Tukeys test ...
Introduction: Soldering has several applications in prosthodontic treatments; however, the effect of soldering on porcelain to metal bond strength has not been adequately studied. This study was designed to assess the bond strength of porcelain to metal, and the mode of failure at the soldered and non-soldered areas of cubic ...
Hair rebonding allows breakage of hair bonds, rearranging those bonds and restructures it once again to the desired, straight, state. Using a flat iron, the hair bonds are restructured and then applied with a neutralizing agent that will preserve the newly structured hair bonds.. The tool usedis a flat-iron to flatten/straighten the hair and relatively takes longer than relaxing.. The effect relatively takes longer than relaxing but is more lasting than relaxing and the results of hair rebonding will be a pin-straight, flat-out stick straight hair.. If you like the sleek, super straight look, then this option will be suitable for you. But to me, after many years (and many times!) of rebonding my hair, I find that it looks rather unnatural and closer to a broomstick effect than a healthy straight hair effect. ...
In determining the fracture toughness of a test specimen, standards currently require either locally-measured load-line displacements or clip gage displacements. In order to measure these parameters, secondary sensors generally need to be installed and calibrated, which often comes at a higher cost. As crosshead displacements are automatically measured in most modern material test machines, use of the crosshead measurements alone would be less expensive. Although much criticism exists on the accuracy of this approach in determining CTOD values, the method can still prove sufficiently accurate for many applications. The current paper aims to assess the magnitude of the errors that arise from using the crosshead displacement in fracture mechanics testing of steels with the Single Edge Notched Bending (SENB) specimen geometry. The results show that for steels with sufficiently large toughness, the use of the crosshead displacement to calculate J and convert to CTOD produces results within 10% of ...
TY - JOUR. T1 - New residual stress detector using angle resolved Barkhausen noise. AU - Yamaguchi, Katsuhiko. AU - Imae, Kazuhito. AU - Nittono, Osamu. AU - Takagi, Toshiyuki. AU - Yamada, Koji. PY - 2011/7/4. Y1 - 2011/7/4. N2 - A new possibility of residual stress detector is proposed for iron based materials through measurement of angle resolved Barkhausen noise which is known as phenomena of dynamic magnetic process. It is important for keeping safety of our society to early detect metal fatigue, therefore the convenient residual stress detector will be available especially for machines including any robots given heavy loads.. AB - A new possibility of residual stress detector is proposed for iron based materials through measurement of angle resolved Barkhausen noise which is known as phenomena of dynamic magnetic process. It is important for keeping safety of our society to early detect metal fatigue, therefore the convenient residual stress detector will be available especially for ...
Кератинова трайно изправяща терапия - KERATIN STRAIGHTENING REBONDING SYSTEM KERATIN STRAIGHTENING REBONDING SYSTEM - Кератинова трайно изправяща терапия
Hello, I seek a TUTORIAL to simulate a cylindrical flow of a Newtonian fluid by ANSYS and ANSYS CFX FLEUNT. I tried with ANSYS FLUENT but I can not
The Woodlands, TX - October 5, 2012. Rigaku announces today the global release of the AutoMATE II, a highly accurate micro area residual stress analyzer. The AutoMATE II is an improved version of the AutoMATE, a popular residual stress analyzer in the Japanese automotive industry. The AutoMATE II is designed to ensure that the highest standards are met, as far as residual stress is concerned, in terms of part quality, reliability, durability and safety when automotive parts are designed or produced.1449876037
The New Weibull Handbook 4th edition written by Dr. Robert B. Abernethy shows the latest developments in Weibull analysis with examples that demonstrate the use of reliability software known as SuperSMITH, WinSMITH Weibull, WinSMITH Visual
This is a digital book in PDF format. It Will Be Sent To The Email You Use For The Purchase Within 12 Hours Or Less. This is for the digital ver
For i) I found the eigen values and eigen vectorsto be λ = 2,-2,0 and for λ= 2 the vector is [1,1,0] for λ= -2, [-1,1,0] and for λ= 0, [0,0,1]. Now in order to populate the principal stress tensor do I know which value goes where based on the vectors? Trying that I get {2,0,0;0,-2,0;0,0,0} is this correct ...
Crosshead extrusion process is widely used to coat wires and cables with a polymer. The basic procedure includes pulling of the wire / cable to be coated at a uniform rate via a crosshead die, where it is covered with the molten plastic. This extrusion process for coating is used in most wires and cables […]. ...
Gelest, Inc. has unveiled its new SIVATETM A610 activated amine functional silane, which improves adhesion, speeds reactivity and increases bond strength in packaging, polymer, micro-electronics and curing applicat
ANSYS Advantage spotlights how engineering simulation helps the aerospace industry improve fuel efficiency, environmental compliance and sustainment.
Did you know that the orthodontic patient who has missed one appointment, has had one loose bracket, and 4 broken brackets (that require rebonding), has just added an average of just under 7 months to their treatment time? ...
Order # 034522101 Multi-use Hybrid with Unsurpassed Biocompatibility, Bond Strength, and Versatility The physical properties of this unique and extremely biocom
It is our objective at Instron to provide our customers the best ownership experience by delivering the highest quality products, expert support and world-class service.". ...
See attached for proper formatting Assignment 2: Mixed Problems 1. In a one-way ANOVA, if the test is conducted and the null hypothesis is rejected, what does this indicate? (2 pts) A. All the population means are equal.
I find myself in the middle of a huge blowup between Max Keiser and Tom Woods over Mises, Menger and Austrian economics and feel that this is an opportune moment to express some doubts I have regarding contemporary Austrian methodology. I am to some extent an Austrian, on three counts. First, I subscribe to the notion that…
I find myself in the middle of a huge blowup between Max Keiser and Tom Woods over Mises, Menger and Austrian economics and feel that this is an opportune moment to express some doubts I have regarding contemporary Austrian methodology. I am to some extent an Austrian, on three counts. First, I subscribe to the notion that…
The purpose of this study was to investigate the effect of saliva contamination on the shear bond strength of an orthodontic adhesive used with Transbond Moisture-Insensitive Primer (MIP, 3M Unitek, Monrovia, Calif) and Transbond Plus Self-Etching Primer (SEP, 3M Unitek). Hydrophobic Transbond XT primer (XT, 3M Unitek) was used as a control. A total of 162 extracted premolars were collected and divided equally into 9 groups of 18 teeth each, and brackets were bonded with Transbond XT adhesive (3M Unitek) under different experimental conditions: (1) control: etch/dry/XT, (2) etch/dry/MIP, (3) etch/dry/MIP/wet (saliva)/MIP, (4) etch/wet/MIP, (5) etch/wet/MIP/wet/MIP, (6) dry/SEP, (7) dry/SEP/wet/SEP, (8) wet/SEP, and (9) wet/SEP/wet/SEP. Shear bond strength of each sample was examined with a testing machine. The results showed that the control group had the highest mean shear bond strength (group 1, 21.3 +/- 6.8 MPa), followed by the MIP group in a dry field (group 2, 20.7 +/- 5.0 MPa). No significant
TY - JOUR. T1 - Effects of dentin surface treatments on the shear bond strength of vitrabond. AU - Prati, C.. AU - Montanari, G.. AU - Biagini, G.. AU - Fava, F.. AU - Pashley, David Henry. PY - 1992/1/1. Y1 - 1992/1/1. N2 - The influences of nine dentin surface treatments were evaluated on the shear bond strength of a new light-cured glass-ionomer cement (GIC) and on the SEM morphology of the treated dentin surfaces. The following treatments were performed: saline solution (control), NaOCl, acidic glycine, EDTA, malic acid, malic acid plus glycine, polyacrylic acid, tannic acid, and neutral + acidic oxalate solutions. Buccal dentin surfaces were polished with #320-grit abrasive paper, treated with one of the chemicals, washed, and air-dried. Cylindrical GIC samples were then applied to the dentin surface, stored in 100% humidity, and tested after 24 h. SEM observations demonstrated no effect of saline or NaOCl treatment on the smear layer but its complete removal with exposure of collagen ...
The objective of this study was to compare dentin shear bond strength (DSBS) of dentin bonding agents (DBAs) cured with a plasma arc (PAC) light curing unit (LCU) and those cured with a light emitting diode (LED) LCU. Optical properties were also analyzed for Elipar freelight 2 (3M ESPE); LED LCU, Apollo 95E (DMT Systems); PAC LCU and VIP Junior (Bisco); Halogen LCU. The DBAs used for DSBS test were Scotchbond Multipurpose (3M ESPE), Singlebond 2 (3M ESPE) and Clearfil SE Bond (Kuraray). After DSBS testing, fractured specimens were analyzed for failure modes with SEM. The total irradiance and irradiance between 450 nm and 490 nm of the LCUs were different. LED LCU showed narrow spectral distribution around its peak at 462 nm whereas PAC and Halogen LCU showed a broad spectrum. There were no significant differences in mean shear bond strength among different LCUs (P > 0.05) but were significant differences among different DBAs (P < 0.001). ...
Purpose: To examine the effects of the hemostatic agents ViscoStat and ViscoStat Plus on the shear bond strength (SBS) of composite resin (CR) to dentin in the presence and absence of blood. Materials and Methods: Sixty permanent teeth mounted in acrylic were randomly divided into 5 groups (n = 12): (1) control, C; (2) ViscoStat, VS; (3) ViscoStat Plus, VS+; (4) ViscoStat and blood, VS/B; (5) ViscoStat Plus and blood, VS+/B. Groups 2 and 3 were exposed to VS and VS+, respectively. Freshly drawn human blood was placed on groups 4 and 5 immediately followed by VS and VS+, respectively. Specimens remained undisturbed for 1 min and were rinsed with tap water for 1 min. All groups were etched with 35% phosphoric acid and were bonded utilizing the Ultradent bonding clamp, Optibond Solo Plus, and Z-250 composite resin. Following water storage for 48 hrs at 37 C, specimens were debonded in an Instron test frame at a crosshead speed of 0.5 mm/min. Statistical analysis was done with one-way analysis of ...
The purpose of this study was to compare different solutions for the storage of teeth and their influence on the enamel surface. The bond strength of bonded brackets on the enamel surface was determined by shear testing with an Instron measuring machine (feed rate 0.5 mm/min). Previously, these teeth had been stored in different solutions and their bond strengths were compared to the values of freshly extracted teeth. The statistical depiction was performed by means of descriptive and explorative data analysis. The analysis was carried out with the SPSS program. For group comparison purposes, the single-factor variance analysis (ANOVA) and the Post Hoc Test (Tukey HSD) were used. The level of significance was set at P < .05. The study showed that bond strength using formaldehyde fixation came closest to bond strength from freshly extracted teeth, so a formaldehyde solution should be used for storage. Only bond strength with teeth stored in thymol was significantly different (P = .02) from that ...
A phosphate glass ceramic which can be utilized especially as biomaterial in medicine and biology. The object of the invention is to provide a glass ceramic extensively adapted to bone, possessing adjustable biologically active characteristics. Another object of the invention is to produce a glass ceramic free of SiO2 or low in SiO2, of high P2 O5 and CaO content, possessing adjustable biologically active characteristics. The object is solved, whereby an initial glass of the composition having the mass percentages of Al2 O3 3-21, CaO 8-26, R2 O 10-25, P2 O5 43-58, is provided under the condition that R2 O can contain up to 25% of mass of Na2 O and up to 18% of mass of K2 O, and is thermally treated after melting, to provide the new phosphate glass ceramic. The main crystal phases are apatite and aluminiumorthophosphate. The phosphate glass ceramic can contain additions of SiO2, B2 O3, F-, MgO, FeO, Fe2 O3, TiO2.
Objectives: To investigate the efficacy of a new orthodontic bonding system that incorporates the primer solution in the adhesive. Materials and Methods: 90 anterior bovine teeth were divided in three groups: in Group I, brackets were bonded with Transbond XT system, in Group II with GC Ortho Connect which incorporates the primer in the adhesive, and in Group III, a single layer of primer was applied on the teeth before bonding the brackets with GC Ortho Connect. After a 24-hour latency period, Shear Bond Strength (SBS) and Adhesive Remnant Index (ARI) were measured. In cases with remnants left mainly on the bracket base, energy dispersive X-ray (EDX) spectrometry was performed in order to determine the presence of calcium particles. Selected cases were examined with Scanning Electron Microscopy (SEM) analysis and in nanometer scale with a confocal visible light microscope (μsurf revolver, NanoFocus AG, Germany). Results: The mean SBS values were 7.25 ± 0.58 MPa for Group I, 6.57 ± 0.50 MPa for Group
MATERIALS AND METHODS: Y-TZP zirconia specimens in three experimental groups were subjected to Y-TZP particle deposition via dipping into the milling residue suspension at different times prior to the sintering process. The dipping procedure was repeated twice for each specimen in group B, six times in group C, and ten times in group D. The specimens subjected to airborne-particle abrasion (110 μm Al2 O3, Rocatec Pre) acted as the control group (group A). All of the specimens were then bonded using adhesive resin cement (RelyX Ultimate). A μ-PO test was used to determine the bond strength values. One-way ANOVA at a 5% confidence level was performed for data analysis. Optical microscopy and scanning electron microscopy (SEM) were used to evaluate the failure modes and surface structure ...
Objectives: The objective was to assess the shear bond strength (SBS) of composite resins on stainless steel brackets immediately bonded to previously bleached teeth with 35% hydrogen peroxide and to compare the neutralization effect of various antioxidant agents on the bond strength after bleaching. Materials and Methods: One hundred sound human maxillary premolars were used for the study. Teeth were divided into 5 groups (n = 20); Group 1 (control), Group 2 (bleach treatment), Group 3 (sodium ascorbate treatment), Group 4 (tocopherol acetate treatment), and Group 5 (retinol acetate treatment). Teeth in Group 3, 4, and 5 were treated as in Group 2, but after that and before bleaching received treatment with sodium ascorbate, tocopherol acetate, and retinol acetate, respectively. Subsequently, teeth were bonded with stainless steel brackets (Ormco) using 3M Transbond XT. After 24 h, each specimen was loaded into a universal testing machine to determine the SBS at debonding. The data were exposed ...
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