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https://www.readbyqxmd.com/read/29221031/robust-interferometer-with-external-phase-shift-control
#1
José A Ferrari, Jorge L Flores, Gastón A Ayubi, Erna Frins
We describe a robust interferometer with external phase-shift control that does not require moving parts. The optical architecture resembles a common-path device in which the interfering waves propagate together in one collimated beam passing through the test sample. The collimated beam is incident on a calcite plate, which produces a polarization selective lateral translation and superposition of the reference and test waves. The characteristic features of the proposed interferometer, i.e. one-beam single-element scheme combined with external phase-shift control without moving parts, make a highly vibration insensitive device...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29079811/self-propulsion-of-a-grain-filled-dimer-in-a-vertically-vibrated-channel
#2
C Xu, N Zheng, L-P Wang, L-S Li, Q-F Shi, Zhiyue Lu
Steady dissipation of energy is a crucial property that distinguishes active particles from Brownian particles. However, it is not straightforward to explicitly model the dissipative property of existing active particles driven by a vibrating plate. We present a novel active particle that can be explicitly modeled by Newtonian dynamics of a conservative force field plus two asymmetrical dissipative terms. The particle is a dimer consisting of two ping-pong balls connected by a rigid rod, and its two balls are filled with granular particles of the same total mass but of different grain size...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29054109/influence-of-backside-loading-on-the-floating-mass-transducer-an-in-vitro-experimental-study
#3
Antoniu-Oreste Gostian, Martin Sylvester Otte, David Pazen, Magdalene Ortmann, David Schwarz, Karl Bernd Hüttenbrink, Dirk Beutner
HYPOTHESIS: The vibration of the floating mass transducer (FMT) of a single active middle-ear implant (AMEI) is distinctly influenced by the properties of the material coupled to its back side. BACKGROUND: In round window vibroplasty, the FMT needs to be padded against the surrounding bone opposite from the round window membrane. This represents one factor influencing its performance as a round window driver. Therefore, we examined the effects of different materials linked to the back side of an FMT on its vibration range...
October 20, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28985624/modal-analysis-and-nonlinear-characterization-of-an-airborne-power-ultrasonic-transducer-with-rectangular-plate-radiator
#4
R R Andrés, V M Acosta, M Lucas, E Riera
Some industrial processes like particle agglomeration or food dehydration among others can be enhanced by the use of power ultrasonic technologies. These technologies are based on an airborne power ultrasonic transducer (APUT) constituted by a pre-stressed Langevin-type transducer, a mechanical amplifier and an extensive plate radiator. In order to produce the desired effects in industrial processing, the transducer has to vibrate in an extensional mode driving an extensive radiator in the desired flexural mode with high amplitude displacements...
January 2018: Ultrasonics
https://www.readbyqxmd.com/read/28964102/transmission-loss-of-plates-with-embedded-acoustic-black-holes
#5
Philip A Feurtado, Stephen C Conlon
In recent years acoustic black holes (ABHs) have been developed and demonstrated as an effective method for developing lightweight, high loss structures for noise and vibration control. ABHs employ a local thickness change to tailor the speed and amplitude of flexural bending waves and create concentrated regions of high strain energy which can be effectively dissipated through conventional damping treatments. These regions act as energy sinks which allow for effective broadband vibration absorption with minimal use of applied damping material...
September 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28950466/wave-turbulence-theory-of-four-wave-nonlinear-interactions
#6
Sergio Chibbaro, Giovanni Dematteis, Christophe Josserand, Lamberto Rondoni
The Sagdeev-Zaslavski (SZ) equation for wave turbulence is analytically derived, both in terms of a generating function and of a multipoint probability density function (PDF), for weakly interacting waves with initial random phases. When the initial amplitudes are also random, a one-point PDF equation is derived. Such analytical calculations remarkably agree with results obtained in totally different fashions. Numerical investigations of the two-dimensional nonlinear Schrödinger equation (NLSE) and of a vibrating plate prove the following: (i) Generic Hamiltonian four-wave systems rapidly attain a random distribution of phases independently of the slower dynamics of the amplitudes, vindicating the hypothesis of initially random phases...
August 2017: Physical Review. E
https://www.readbyqxmd.com/read/28941397/semi-analytical-modeling-of-anchor-loss-in-plate-mounted-resonators
#7
Christoph Schaal, Robert M'Closkey, Ajit Mal
A semi-analytical technique for estimating the energy loss in a resonator mounted to an infinite plate substrate is proposed in this paper. In a plate, only Lamb waves have to be considered, leading to a simplified characterization of the energy carried away from a vibrating source on the plate surface. Instead of employing absorbing elements at the boundaries of the plate-resonator finite element model, it is shown how the semi-analytical approach of stitching together analytical Lamb wave expressions to the finite element model can be utilized...
January 2018: Ultrasonics
https://www.readbyqxmd.com/read/28938021/alterations-in-the-ability-to-maintain-balance-as-a-result-of-stochastic-resonance-whole-body-vibration-in-women
#8
Karolina Donocik, Magdalena Hartman-Petrycka, Agata Lebiedowska, Barbara Błońska-Fajfrowska
PURPOSE: A vertical posture makes it difficult to maintain balance especially in the elderly. Loss of balance leads to falls and injuries. In the present study, we evaluated whether balance maintenance can be improved with the use of stochastic resonance whole body vibration (SR-WBV). METHODS: An examination of balance, involving 187 women aged 19-74 years, was conducted using double-plate posturography pre and post SR-WBV. The SR-WBV trainings were performed using the SRT Zeptor Medical-plus noise device...
2017: PloS One
https://www.readbyqxmd.com/read/28925539/expression-and-functional-proteomic-analyses-of-osteocytes-from-xenopus-laevis-tested-under-mechanical-stress-conditions-preliminary-observations-on-an-appropriate-new-animal-model
#9
Jessika Bertacchini, Marta Benincasa, Marta Checchi, Francesco Cavani, Alberto Smargiassi, Marzia Ferretti, Carla Palumbo
Hitherto, the role of the osteocyte as transducer of mechanical stimuli into biological signals is far from settled. In this study, we used an appropriate model represented by the cortex of Xenopus laevis long bone diaphysis lacking (unlike the mammalian one) of vascular structures and containing only osteocytes inside the bone matrix. These structural features allow any change of protein profile that might be observed upon different experimental conditions, such as bone adaptation to stress/mechanical loading, to be ascribed specifically to osteocytes...
December 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28914917/compact-single-shot-radial-shearing-interferometer-with-random-phase-shift
#10
Naiting Gu, Benxi Yao, Linhai Huang, Changhui Rao
We propose a compact phase-shifting radial shearing interferometer based on a pixelated micro-retarder array (MRA). The MRA is made of a thin birefringence plate, and is composed of identical units that have pixels of four different thicknesses. We demonstrate that pixelated phase delay between two shearing beams can be introduced by applying the fast axis of birefringence plate in the horizontal or vertical orientation. We also present an approach to extract the wavefront under test with random phase shift, which dramatically reduces the machining difficulty of the MRA...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28886660/a-multi-plate-velocity-map-imaging-design-for-high-resolution-photoelectron-spectroscopy
#11
Steven J Kregel, Glen K Thurston, Jia Zhou, Etienne Garand
A velocity map imaging (VMI) setup consisting of multiple electrodes with three adjustable voltage parameters, designed for slow electron velocity map imaging applications, is presented. The motivations for this design are discussed in terms of parameters that influence the VMI resolution and functionality. Particularly, this VMI has two tunable potentials used to adjust for optimal focus, yielding good VMI focus across a relatively large energy range. It also allows for larger interaction volumes without significant sacrifice to the resolution via a smaller electric gradient at the interaction region...
September 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28878995/a-generalized-solution-procedure-for-in-plane-free-vibration-of-rectangular-plates-and-annular-sectorial-plates
#12
Siyuan Bao, Shuodao Wang
A generalized solution procedure is developed for in-plane free vibration of rectangular and annular sectorial plates with general boundary conditions. For the annular sectorial plate, the introduction of a logarithmic radial variable simplifies the basic theory and the expression of the total energy. The coordinates, geometric parameters and potential energy for the two different shapes are organized in a unified framework such that a generalized solving procedure becomes feasible. By using the improved Fourier-Ritz approach, the admissible functions are formulated in trigonometric form, which allows the explicit assembly of global mass and stiffness matrices for both rectangular and annular sectorial plates, thereby making the method computationally effective, especially when analysing annular sectorial plates...
August 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28864300/the-pregenital-abdomen-of-enicocephalomorpha-and-morphological-evidence-for-different-modes-of-communication-at-the-dawn-of-heteropteran-evolution
#13
Leonidas-Romanos Davranoglou, Petr Baňař, Christian M Schlepütz, Beth Mortimer, Graham K Taylor
The internal and external anatomy of the posterior metathoracic region, pregenital abdomen, and associated nervous system of the heteropteran infraorder Enicocephalomorpha are thoroughly described, using an array of state-of-the art techniques. Based on morphology, it is hypothesised which modes of communication these insects use. This study is based primarily on an undescribed species of Cocles Bergroth, 1905 (Enicocephalidae) and another undescribed species of Lomagostus Villiers, 1958 (Aenictopecheidae), but additional representatives of the infraorder are also examined...
September 20, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/28840041/a-comparison-between-different-finite-elements-for-elastic-and-aero-elastic-analyses
#14
Mohamed Mahran, Adel ELsabbagh, Hani Negm
In the present paper, a comparison between five different shell finite elements, including the Linear Triangular Element, Linear Quadrilateral Element, Linear Quadrilateral Element based on deformation modes, 8-node Quadrilateral Element, and 9-Node Quadrilateral Element was presented. The shape functions and the element equations related to each element were presented through a detailed mathematical formulation. Additionally, the Jacobian matrix for the second order derivatives was simplified and used to derive each element's strain-displacement matrix in bending...
November 2017: Journal of Advanced Research
https://www.readbyqxmd.com/read/28822458/-the-research-and-application-of-pretreatment-method-for-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-identification-of-filamentous-fungi
#15
Y F Huang, Z Chang, J Bai, M Zhu, M X Zhang, M Wang, G Zhang, X Y Li, Y G Tong, J L Wang, X X Lu
Objective: To establish and evaluate the feasibility of a pretreatment method for matrix-assisted laser desorption ionization-time of flight mass spectrometry identification of filamentous fungi developed by the laboratory. Methods: Three hundred and eighty strains of filamentous fungi from January 2014 to December 2016 were recovered and cultured on sabouraud dextrose agar (SDA) plate at 28 ℃ to mature state. Meanwhile, the fungi were cultured in liquid sabouraud medium with a vertical rotation method recommended by Bruker and a horizontal vibration method developed by the laboratory until adequate amount of colonies were observed...
August 8, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28816944/acute-changes-in-neuromuscular-activity-in-vertical-jump-and-flexibility-after-exposure-to-whole-body-vibration
#16
RANDOMIZED CONTROLLED TRIAL
Giuseppe Annino, Ferdinando Iellamo, Francesco Palazzo, Augusto Fusco, Mauro Lombardo, Francesca Campoli, Elvira Padua
This study was aimed to investigate the neuromuscular activity after 10 minutes of exposure to a whole body vibration (WBV) session.Twenty male young adults (24.8 ± 2.5 year olds) were randomized and divided into 2 groups: the vibration group (VG) was exposed to 10 minutes of WBV at 35 Hz; performed 10 minutes of WBV at 35 Hz (displacement = 5 mm; magnitude = 5 g); the nonvibrated group (NVG) was the placebo group that maintained the same position on the plate but without exposure to any type of vibration...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28799810/acute-effects-of-whole-body-vibration-on-balance-in-persons-with-and-without-chronic-ankle-instability
#17
Nicole K Rendos, Hyung-Pil Jun, Nancy M Pickett, Karen Lew Feirman, Kysha Harriell, Sae Yong Lee, Joseph F Signorile
Chronic ankle instability (CAI) is a common condition following ankle injury that is associated with compromised balance. Whole body vibration training (WBVT) programmes are linked with improved balance and function in athletic and non-athletic populations and may improve balance in CAI. Twelve healthy and seven CAI participants completed two randomly assigned interventions. Two Power Plate® platforms were attached back to back using a Theraband®. Participants stood on the active plate and inactive plate for WBVT and sham interventions, respectively...
October 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28783124/a-semi-analytical-solution-for-the-thickness-vibration-of-centrally-partially-electroded-circular-at-cut-quartz-resonators
#18
Bin Wang, Xiaoyun Dai, Xintao Zhao, Zhenghua Qian
Vibration frequencies and modes for the thickness-shear vibrations of infinite partially-electroded circular AT-cut quartz plates are obtained by solving the two-dimensional (2D) scalar differential equation derived by Tiersten and Smythe. The Mathieu and modified Mathieu equations are derived from the governing equation using the coordinate transform and the collocation method is used to deal with the boundary conditions. Solutions of the resonant frequencies and trapped modes are validated by those results obtained from COMSOL software...
August 7, 2017: Sensors
https://www.readbyqxmd.com/read/28752108/measuring-behavioral-individuality-in-the-acoustic-startle-behavior-in-zebrafish
#19
Carlos Pantoja, Adam Hoagland, Elizabeth Carroll, David Schoppik, Ehud Y Isacoff
The objective of this protocol is to provide a detailed description for the construction and use of a behavioral apparatus, the zBox, for high-throughput behavioral measurements in larval zebrafish (Danio rerio). The zBox is used to measure behavior in multiple individuals simultaneously. Individual fish are housed in wells of multi-well plates and receive acoustic/vibration stimuli with simultaneous recording of behavior. Automated analysis of behavioral movies is performed with MATLAB scripts. This protocol was adapted from two of our previously published papers (Levitz et al...
April 5, 2017: Bio-protocol
https://www.readbyqxmd.com/read/28711781/the-nature-of-hydrogen-bonding-interactions-in-nonsteroidal-anti-inflammatory-drugs-revealed-by-polarized-ir-spectroscopy
#20
Barbara Hachuła
The influence of hydrogen-bonding interactions in the solid phase on the IR spectroscopic pattern of the νOH band of nonsteroidal anti-inflammatory drugs (NSAIDs) was studied experimentally by IR spectroscopy with the use of polarized light at two temperatures (293K and 77K) and in isotopic dilution. The neat and deuterated crystals of (S)-naproxen ((S)-NPX), (R)-flurbiprofen ((R)-FBP), (RS)-flurbiprofen ((RS)-FBP) and (RS)-ketoprofen ((RS)-KTP) were obtained by melt crystallization between the two squeezed CaF2 plates...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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