AMERICO ULTRA PROTECTOR APPLICATION FILETYPE PDF

Applications of ENF criterion in forensic audio, video, computer and The sensor design structure, divided into protective layer, piezoresistive layer, support layer. the time each file type required to fail under cyclic flexural fatigue testing. In this study, the flexural behavior of ultra-high-performance fiber- reinforced. Several alternative application of Reed’s terrestrial-passage foundation to The sensor design structure, divided into protective layer, piezoresistive layer, support layer. The analytes were separated and quantified by ultra performance liquid .. the time each file type required to fail under cyclic flexural fatigue testing. The general theory is formulated in view of application to graphene, The sensor design structure, divided into protective layer, piezoresistive layer, support layer. the time each file type required to fail under cyclic flexural fatigue testing. .. Albuquerque, Cibele Gonçalves de; Correr, Américo Bortolazzo; Venezian.

Author: JoJojind Zolojind
Country: Burundi
Language: English (Spanish)
Genre: Travel
Published (Last): 10 July 2013
Pages: 122
PDF File Size: 9.16 Mb
ePub File Size: 1.12 Mb
ISBN: 671-1-17883-271-6
Downloads: 49184
Price: Free* [*Free Regsitration Required]
Uploader: Yozshukinos

Plate equations for piezoelectrically actuated flexural mode ultrasound transducers. This paper considers variational methods to derive two-dimensional plate equations for piezoelectrically actuated flexural mode ultrasound transducers. In the absence of analytical expressions for the equivalent circuit parameters of a flexural mode transducer, it is difficult to calculate its optimal parameters ameeico dimensions, and to choose suitable materials.

The influence of coupling between flexural and aplpication deformation, and coupling between the structure and the acoustic volume on the dynamic response of piezoelectrically actuated flexural mode transducer is analyzed using variational methods.

Variational methods are applied to derive two-dimensional plate equations for the transducer, and to calculate the coupled electromechanical field variables. In these methods, the variations across the thickness direction vanish by using the stress resultants.

Thus, two-dimensional plate equations for a stepwise laminated circular plate are obtained. Flexural strength and failure modes of layered ceramic structures.

For bi-layered design, the specimens were tested in both conditions: Fracture surfaces were analyzed using stereomicroscope and scanning electron microscopy SEM. Two types of fracture mode were identified: The mechanical performance of the specimens was determined by the amercio under tension during testing, confirming the study hypothesis.

Published by Elsevier Ltd. This reporting period marked a change in the funding configuration from a combination of a grant and a contract from two different National Aeronautics and Space Administration NASA sections to one single contract.

We chose this reporting period as a transition from the previous reporting period of 1 April to 31 March, to the current reporting period of 18 November to 17 November. To compliment our new mission, we have a new name, the Alaska Satellite Facility ASFdeeply rooted in the University environment and focused on satellite data products, services, and science support.

We have the opportunity to reshape and rebuild ASF ; we will continue to honor our heritage and Serve the science community. Our long-term goals include the commitment to continued first-rate service to our user community. Modeling and analysis of circular flexural-vibration-mode piezoelectric transformer. We propose a circular flexural-vibration-mode piezoelectric transformer and perform a theoretical analysis of the transformer.

An equivalent circuit is derived from the equations of piezoelectricity and the Hamilton’s principle. With this equivalent circuit, the voltage gain ratio, input impedance, and the efficiency of the circular flexural-vibration-mode piezoelectric transformer can be determined.

The basic behavior of the transformer is shown by numerical results. Cooling flexural modes of a mechanical oscillator by magnetically trapped Bose-Einstein-condensate atoms.

We theoretically study cooling of flexural modes of a mechanical oscillator by Bose-Einstein-condensate BEC atoms Rb87 trapped in a magnetic trap. The mechanical oscillator with a tiny magnet attached on one of its free ends produces an oscillating magnetic field.

When its oscillating frequency matches certain hyperfine Zeeman energy of Rb87 atoms, the trapped BEC atoms are coupled out of the magnetic trap by the mechanical oscillator, flying away from the trap with stolen energy from the mechanical oscillator.

Thus the mode temperature of the mechanical oscillator is reduced. The mode temperature of the steady state of mechanical oscillator, measured by the mean steady-state phonon number in the flexural mode of the mechanical oscillator, is analyzed. It is found that ground state phonon number less than 1 may be accessible with optimal parameters of the hybrid system of mechanical oscillator and trapped BEC atoms. Comparing contribution of flexural and planar modes to thermodynamic properties.

Graphene, the most studied and explored 2D structure has unusual thermal properties such as negative thermal expansion, high thermal conductivity etc.

  ALEX ZINN CISCO IP ROUTING PDF

We have already studied the thermal expansion behavior and various thermodynamic properties of pure graphene like heat capacity, entropy and free energy. The results of thermal expansion and various thermodynamic properties match well with available theoretical studies. For a deeper understanding of these properties, we analyzed the contribution of each phonon branch towards the total value of the individual property. To compute these properties, the dynamical matrix was calculated using VASP code where the density functional perturbation theory DFPT is employed under quasi-harmonic approximation in interface with phonopy code.

It is noticed that transverse mode has major contribution to negative thermal expansion and all branches have almost same contribution towards the various thermodynamic properties with the contribution of ZA mode being the highest. Experimental and simulation characterisation of flexural vibration modes in unimorph ultrasound transducers. A unimorph flexural transducer design is proposed and tested with regard to mode shapes and frequencies.

The transducers consist of a passive metal cap structure, and a thin piezoelectric disc, rigidly bonded to the inside. Extensive finite element FE modelling, and experimental 2D, time-resolved displacement measurements were done to characterise the transducers flexural properties, and to compare them to the analytical solutions of thin vibrating plates.

Emphasis was put on characterising the passive layer of the unimorph structure, before bonding the piezoelectric element, to understand how the active element affects the behaviour of the flexing plate. A high power Nd: YAG laser was used to actuate the metal plate non-contactand the frequency content of the resulting displacement signal was analysed to identify the flexural modes.

The non-axisymmetric modeswhich are conventionally disregarded because of their unfavourable acoustic properties, were also taken into account. There was excellent agreement between the experimental results and the FE simulation data. There was good agreement with the analytical edge clamped plate model, but with some notable deviations, which have not previously been identified or commented upon.

Americo’s revamped product lineup includes both competitive rates and compensation.

Specifically, the second axisymmetric mode is split into three separate modeswhich is not explained by the traditional theory of vibrating plates.

Published by Elsevier B. Rapid repair of severely earthquake-damaged bridge piers with flexural -shear failure mode.

An experimental study was conducted to investigate the feasibility of a proposed rapid repair technique for severely earthquake-damaged bridge piers with flexural -shear failure mode. Six circular pier specimens were first tested to severe damage in flexural -shear mode and repaired using early-strength concrete with high-fluidity and carbon fiber reinforced polymers Ametico.

After about four days, the repaired specimens were tested to failure again. The seismic behavior of the repaired specimens was evaluated and compared to the original specimens. Test results indicate that the proposed repair technique is highly effective. Both shear strength and lateral displacement of the repaired piers increased when compared to the original specimens, and the failure mechanism of the piers shifted from flexural -shear failure to ductile flexural failure.

Finally, a simple design model based on the Seible formulation for post-earthquake repair design was compared to the experimental results. It is concluded that the design equation for bridge pier strengthening before an earthquake could be applicable to seismic repairs after an earthquake if the shear strength contribution of the spiral bars in the repaired piers is disregarded and 1.

Sound waves and flexural mode dynamics in a,erico crystals.

Starting from a Hamiltonian with anharmonic coupling between in-plane acoustic displacements and out-of-plane flexural modeswe derived coupled applicaation of motion for in-plane displacements correlations and flexural mode density fluctuations. Linear response theory and time-dependent thermal Green’s functions techniques americco applied in order to obtain different response fildtype.

As external perturbations we allow for stresses and thermal heat sources. The displacement correlations are described by a Dyson equation where the flexural density distribution enters as an additional perturbation. The flexural density distribution satisfies a a;plication equation where the in-plane lattice displacements act as a perturbation.

In the hydrodynamic limit this system of coupled equations is at the basis of a unified description of elastic and thermal phenomena, such as isothermal versus adiabatic sound motion and thermal proetctor versus second sound. The general theory is formulated in view of application to graphene, two-dimensional h-BN, and 2H-transition metal dichalcogenides and oxides. It has been documented that AE signals propagate in thin plates as extensional and flexural plate modes. A typical signal from a pencil lead break source which identifies these two modes is shown.

Smith showed that crack growth events in thin aluminum plates under spectrum fatigue loading produced signals that propagated as plate modes. Additionally, Prosser et al. Experimental study on slow flexural waves around the defect modes in a phononic crystal beam using fiber Bragg gratings. This work experimentally studies influences of the point defect modes on the group velocity of flexural waves in a phononic crystal Timoshenko beam.

  MANUAL DIALUX 4.12 PDF

Using the transfer matrix method with a supercell technique, the band structures and the group velocities around the defect modes are theoretically obtained.

Particularly, to demonstrate the existence of the localized defect modes inside the band gaps, a high-sensitivity fiber Bragg grating protecror system is set up and the displacement transmittance is measured. Slow propagation of flexural waves via defect coupling in the phononic crystal beam is then experimentally demonstrated with Hanning windowed tone burst excitations. Modeling and experimental study on near-field acoustic levitation by flexural mode.

Near-field acoustic levitation NFAL has been used in noncontact handling and transportation of small objects to avoid contamination. We have performed a theoretical analysis based on nonuniform vibrating surface to quantify the levitation force produced by the air film and also conducted experimental tests to verify our model. Modal analysis was performed using ANSYS on the flexural proector radiator to obtain its natural frequency of desired modewhich aoplication used aamerico design the measurement system.

Then, the levitation force was calculated as a function of levitation distance based on squeeze gas film theory using measured amplitude and phase distributions on the vibrator surface.

Compared with previous fluid-structural analyses using a uniform piston motion, our model based on the nonuniform radiating surface of the vibrator is more realistic and fits better with experimentally measured levitation force. Methods to calculate fluid density and viscosity using a micro-cantilever and based on the resonance principle were paplication forward.

Their measuring mechanisms were analyzed and the theoretical equations to calculate the density and viscosity were deduced.

flexural strength measurements: Topics by

The fluid-solid coupling simulations were completed for the micro-cantilevers with different shapes. The sensing chips with micro-cantilevers were designed based on the simulation results and fabricated using the micro electromechanical systems MEMS technology. Finally, the MEMS resonant sensor was packaged with the sensing chip to measure the densities and viscosities of eight different fluids under the flexural and torsional vibrating modes separately.

The experimental results showed that the effects of the shape and vibrating mode of micro-cantilever on the measurement accuracies of fluid density and viscosity were analyzed in detail. Finite element analysis of the end notched flexure specimen for measuring Mode II fracture toughness. The paper presents a finite element analysis of the end-notched flexure ENF test specimen for Mode II interlaminar fracture testing of composite materials.

Virtual crack closure and compliance techniques employed to calculate strain energy release rates from linear elastic two-dimensional analysis indicate that the ENF specimen is a pure Mode II fracture test within the constraints of small deflection theory.

Furthermore, the ENF fracture specimen is shown to be relatively insensitive to process-induced cracks, offset from the laminate midplane. Frictional effects are investigated by including the contact problem in the finite element model.

A parametric study investigating the influence of delamination length, span, thickness, and material properties assessed the accuracy of beam theory expressions for compliance and strain energy release rate, GII. Finite element results indicate that data reduction schemes based upon beam theory underestimate GII by approximately percent for typical unidirectional graphite fiber composite test specimen geometries. Consequently, an improved data reduction scheme is proposed. Mermin-Wagner theorem, flexural modesand degraded carrier mobility in two-dimensional crystals with broken horizontal mirror symmetry.

We speculate that reasonable long-wavelength cutoffs needed to stabilize the structure finite sample size, grain size, wrinkles, defects or the anharmonic coupling between flexural and in-plane acoustic modes shown to be effective in mirror-symmetric crystals, like free-standing graphene may not be sufficient to raise the electron mobility to satisfactory values.

Fano-like resonance phenomena by flexural shell modes in sound transmission through two-dimensional periodic arrays of thin-walled hollow cylinders. The frequencies of the resonant modes are well described by the analytical theory of flexural circumferential modes of thin-walled hollow cylinders and are confirmed by finite-difference time-domain simulations.

Applications of ENF criterion in forensic audio, video, computer and The sensor design structure, divided into protective layer, piezoresistive layer, support layer. the time each file type required to fail under cyclic flexural fatigue testing. In this study, the flexural behavior of ultra-high-performance fiber- reinforced. Several alternative application of Reed’s terrestrial-passage foundation to The sensor design structure, divided into protective layer, piezoresistive layer, support layer. The analytes were separated and quantified by ultra performance liquid .. the time each file type required to fail under cyclic flexural fatigue testing. The general theory is formulated in view of application to graphene, The sensor design structure, divided into protective layer, piezoresistive layer, support layer. the time each file type required to fail under cyclic flexural fatigue testing. .. Albuquerque, Cibele Gonçalves de; Correr, Américo Bortolazzo; Venezian.

Author: Mikaran Diran
Country: Honduras
Language: English (Spanish)
Genre: Technology
Published (Last): 13 November 2004
Pages: 92
PDF File Size: 9.6 Mb
ePub File Size: 11.62 Mb
ISBN: 787-3-53792-634-7
Downloads: 54703
Price: Free* [*Free Regsitration Required]
Uploader: Mibar

Finite element analysis of end notch flexure specimen.

ULTRA PROTECTOR SERIES

A finite element analysis of the end notch flexure specimen for mode II interlaminar fracture toughness measurement was conducted. The effect of friction between the crack faces and large deflection on the evaluation of G sub IIc from this specimen were investigated. Results of uktra study are presented in this paper.

Finite-element analysis of end-notch flexure specimens. A finite-element analysis of the end-notch flexure specimen for Mode II interlaminar fracture toughness measurement was conducted. The effects of friction between the crack faces and large deflection on the evaluation of G IIc from this specimen were investigated. Finite element analysis of the end notched flexure specimen for measuring Mode II fracture toughness.

The paper presents a pprotector element analysis of the end-notched flexure ENF test specimen for Mode II interlaminar fracture testing of composite materials.

Virtual crack closure and compliance techniques employed to calculate strain energy release rates from linear elastic two-dimensional analysis indicate that the ENF specimen is a pure Mode II fracture test within the constraints of small deflection theory.

Furthermore, the ENF fracture specimen is shown to be relatively insensitive to process-induced cracks, offset from the laminate midplane. Frictional effects are investigated by including the contact problem in the finite element model. A parametric study investigating the influence of delamination length, span, thickness, and material properties assessed the accuracy of beam theory expressions for compliance and strain energy release rate, GII.

Finite element results indicate that data reduction schemes based upon beam theory underestimate GII by approximately percent for typical unidirectional graphite fiber composite test specimen geometries. Consequently, an improved data reduction scheme is proposed.

Analysis is carried-out of fracture in the End Notched Flex- ure ENF beam configuration, taking into protrctor the material nonlin- earity.

For this purpose, the J-integral approach is applied. A non-linear model, based on the Classical beam theory is used. The mechanical be- haviour of the Aamerico configuration is described by the Ramberg-Osgood stress-strain curve. It is assumed that the material possesses the same properties in tension and compression. The influence is evaluated of the material constants in the Ramberg-Osgood stress-strain equation on the fracture behaviour.

The effect applicatiin the crack length on the J-integral value is investigated, too. The analytical approach, developed in the present paper, is very useful for parametric amreico, since the simple formulae obtained capture the essentials of the non-linear fracture in the ENF con- figuration.

Two panels were manufactured for this investigation; however, panel two was layed-up incorrectly. As a result, data collected from Panel Two serves no real purpose in this investigation.

Double Cantilever Beam DCB specimens were used to determine the opening Mode I interlaminar fracture toughness, G1 sub cof uni-directional fiber re-inforced composites.

The five specimens tested from Panel One had an average value of The critical strain energy release rate, G2 sub cfor initiation of delamination under inplane shear loading was investigated using the End-Notched Flexure ENF Test. Four specimens were tested from Panel One and an average value of Double cantilever beam and end notched flexure tests were performed to measure the mode I crack opening and mode II sliding or shear interlaminar fracture toughness of the two materials.

  BELASTING ALMANAK 2010 PDF

A 1 inch long Kapton insert at the midplane of one end of the specimen placed during laminate fabrication facilitated crack initiation and extension. It was noted that the specimens provided were smaller than the nominal 1. Similarly, the Kapton inserts were of greater length than those in the present specimens. Hence, the data below should not be compared directly to those generated with the referenced methods.

No preconditioning was performed on the specimens prior to testing. In general, the methodology was used for the present work. Crack opening loads were introduced to the specimens via piano hinges attached to the main specimen faces at a single end of each specimen.

Hinges were bolted to the specimens using the technique presented. The cracks were extended a small distance from the end of the Ultr insert prior to testing. Just before precracking, the sides of the specimens were coated with water-soluble typewriter correction fluid to aid in crack visualization. Scribe marks were then made in the coating at half-inch intervals. Fracture characterization of human cortical bone under mode II loading using the end-notched flexure test.

Fracture characterization of human cortical bone under mode II loading was analyzed using a miniaturized version of the end-notched flexure test. A data reduction scheme based on crack equivalent concept was employed to overcome uncertainties on crack length monitoring during the test.

The crack tip shear displacement was experimentally measured using digital image correlation technique to determine the cohesive law that mimics bone fracture behavior under mode II loading. The developed procedure was validated by finite element analysis using cohesive zone modeling considering a trapezoidal with bilinear softening applicztion.

flexural strength measurements: Topics by

Experimental load-displacement curves, resistance curves and crack tip shear displacement versus applied displacement were used to validate the numerical procedure. The excellent agreement observed between the numerical and experimental results reveals the appropriateness of the proposed test and procedure to characterize human cortical bone fracture under mode II loading.

The proposed methodology can be viewed as a novel valuable tool to be used in parametric and methodical clinical studies regarding features e. Strain energy release rate analysis of the end-notched flexure specimen using the finite-element method. Two-dimensional finite-element analysis of the end-notched flexure specimen was performed using 8-node isoparametric, parabolic elements to evaluate compliance and mode II strain energy release rates, G sub II.

The G sub II values were computed using two different techniques: Three material systems representing a wide range of material properties were analyzed. The compliance and strain energy release rates of the specimen calculated with the present finite-element analysis agree very well with beam theory equations including transverse shear. The G sub II values obtained by the compliance derivative method using the top or bottom beam deflections agreed closely with each other. The strain energy release rates from a plane-stress analysis were higher than the plane-strain values by only a small percentage, indicating that either assumption may be used in the analysis.

The G sub II values for one material system calculated from the finte-element analysis agreed with one solution in the literature and disagreed with the other solution in the literature. Strain-energy-release rate analysis of the end-notched flexure specimen using the finite-element method.

The G sub II values for one material system calculated from the finite-element analysis agreed with one solution in the literature and disagreed with the other solution in the literature.

Applications of ENF criterion in forensic audio, video, computer and telecommunication analysis. In most situations, to reach a non-authenticity opinion, the visual inspection of spectrograms and comparison with an ENF database are enough.

A more detailed investigation, in the time domain, requires short time windows measurements and analyses.

The stability of the ENF over geographical distances has been established by comparison of synchronized recordings made at different locations on the same network. Strain energy release filegype of composite interlaminar end-notch and mixed-mode fracture: This code is useful for obtaining stresses in regions affected by delaminations, transverse cracks, and discontinuities related to inherent fabrication anomalies, geometric configurations, and loading conditions. Particular attention is focussed on those layers or groups of layers sublaminates which are immediately affected by the inherent flaws.

  MANUAL DIALUX 4.12 PDF

These layers are analyzed as homogeneous bodies in equilibrium and in isolation from the rest of the laminate. Thus, sublaminate analysis can be conducted without any restriction on the maximum number of layers, delaminations, transverse cracks, or other types of discontinuities. In conjunction with the strain energy release rate SERR concept and composite micromechanics, this computational procedure is used to model select cases of end-notch and mixed-mode fracture specimens.

The computed stresses are in good agreement with those from a three-dimensional finite element analysis. Also, SERRs compare well with limited available experimental data.

Both the fracture toughness testing and the fatigue testing were xmerico using the End-notched Flexure ENF test.

This report summarizes the test approach, methods, uptra and results of this characterization effort. Outcome of interest was the incidence of ENF. The fixed-effects model was used to pool outcomes across the studies.

There were 3 RCTs and 3 cohort studies included with low risk of bias. Flexural eczema versus atopic dermatitis. Flexural eczema and atopic dermatitis are frequently synonymized. As respiratory atopy is rarely tested for and found in these patients, systematically equating giletype flexural distribution of dermatitis with atopic dermatitis may too frequently result in misclassified diagnoses and potentially missed opportunity for intervention toward improving patients’ symptoms and quality of life.

We present a critical review of the protecotr evidence for the atopic dermatitis diagnosis and discuss the similarities between atopic dermatitis and allergic contact dermatitis.

Because neither flexural predilection nor atopy is specific for atopic dermatitis, we conclude that the term atopic dermatitis is a misnomer and propose an etymologic reclassification of atopic dermatitis to “atopy-related” dermatitis. Allergic contact dermatitis can induce an atopic dermatitis-like phenotype, and thus, flexural dermatitis cannot be assumed as atopic without further testing.

Patch testing should at least be considered in cases of chronic or recurrent eczema regardless of the working diagnosis. Flexure Bearing Reduces Startup Friction.

Design concept for ball bearing incorporates small pieces of shim stock, wire spokes like those in bicycle wheels, or other flexing elements to reduce both stiction and friction slope. In flexure bearing, flexing elements placed between outer race of ball bearing and outer ring. Elements flex when ball bearings encounter small frictional-torque “bumps” or even larger ones when bearing balls encounter buildups of grease on inner or outer race. Flexure of elements reduce high friction slopes of “bumps”, helping to keep torque between outer ring and inner race low and more nearly constant.

Anomalous Flexural Behaviors of Microtubules. Apparent controversies exist on whether the persistence length of microtubules depends on its contour length.

FINAL EXPENSE MADE EASY

This issue is particularly challenging from a theoretical point of view due to the tubular structure and strongly anisotropic material property of microtubules. Our model overcomes some prorector limitations of a recent study based on a simplified anisotropic shell model and results in a closed-form solution for the contour-length-dependent persistence length of microtubules, with predictions in excellent agreement with experimental measurements.

This finding may provide an important theoretical basis for understanding the mechanical structure of protectot spindles during cell division.

Naval Research Laboratory Washi. Protechor gravimetric sensors for chemical. Analysis of flexural wave cloaks. This work presents a comprehensive study of the cloak for bending waves theoretically proposed by Farhat et al. This study uses a semi-analytical approach, the multilayer scattering method, which is based in the Kirchoff-Love wave equation for flexural waves in thin plates.

Our approach was unable to reproduce the predicted behavior of the theoretically proposed cloak.