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https://www.readbyqxmd.com/read/28711781/the-nature-of-hydrogen-bonding-interactions-in-nonsteroidal-anti-inflammatory-drugs-revealed-by-polarized-ir-spectroscopy
#1
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...
July 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28709235/mechanical-excitation-of-rodlike-particles-by-a-vibrating-plate
#2
Torsten Trittel, Kirsten Harth, Ralf Stannarius
The experimental realization and investigation of granular gases usually require an initial or permanent excitation of ensembles of particles, either mechanically or electromagnetically. One typical method is the energy supply by a vibrating plate or container wall. We study the efficiency of such an excitation of cylindrical particles by a sinusoidally oscillating wall and characterize the distribution of kinetic energies of excited particles over their degrees of freedom. The influences of excitation frequency and amplitude are analyzed...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28667293/multiscale-studies-on-the-nonlinear-vibration-of-delaminated-composite-laminates-global-vibration-mode-with-micro-buckles-on-the-interfaces
#3
Jianghong Xue, Fei Xia, Jun Ye, Jianwen Zhang, Shuhua Chen, Ying Xiong, Zuyuan Tan, Renhuai Liu, Hong Yuan
This paper presents a multiscale approach to study the nonlinear vibration of fiber reinforced composite laminates containing an embedded, through-width delamination dividing the laminate into four sub-laminates. The equations of motion are established from macroscopic nonlinear mechanics for plates and shells and micro-mechanics of composite material to allow for the influences of large amplitude, membrane stretching in the neutral plane, and the interactions of the sublaminates. Analytical solutions obtained in this paper reveal that the interaction penalty at the interfaces plays a coupling effect between sublaminates, which eventually alters the vibration characters of the four-sublaminate lamina in macroscopic and microscopic mechanism...
June 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28653973/research-on-a-novel-exciting-method-for-a-sandwich-transducer-operating-in-longitudinal-bending-hybrid-modes
#4
Yingxiang Liu, Qiangqiang Shen, Shengjun Shi, Jie Deng, Weishan Chen, Liang Wang
A novel exciting method for a sandwich type piezoelectric transducer operating in longitudinal-bending hybrid vibration modes is proposed and discussed, in which the piezoelectric elements for the excitations of the longitudinal and bending vibrations share the same axial location, but correspond to different partitions. Whole-piece type piezoelectric plates with three separated partitions are used, in which the center partitions generate the first longitudinal vibration, while the upper and lower partitions produce the second bending vibration...
June 27, 2017: Sensors
https://www.readbyqxmd.com/read/28652048/the-efficacy-of-low-intensity-vibration-to-improve-bone-health-in-patients-with-end-stage-renal-disease-is-highly-dependent-on-compliance-and-muscle-response
#5
Chamith S Rajapakse, Mary B Leonard, Elizabeth A Kobe, Michelle A Slinger, Kelly A Borges, Erica Billig, Clinton T Rubin, Felix W Wehrli
RATIONAL AND OBJECTIVES: Low intensity vibration (LIV) may represent a nondrug strategy to mitigate bone deficits in patients with end-stage renal disease. MATERIALS AND METHODS: Thirty end-stage renal patients on maintenance hemodialysis were randomized to stand for 20 minutes each day on either an active or placebo LIV device. Analysis at baseline and completion of 6-month intervention included magnetic resonance imaging (tibia and fibula stiffness; trabecular thickness, number, separation, bone volume fraction, plate-to-rod ratio; and cortical bone porosity), dual-energy X-ray absorptiometry (hip and spine bone mineral density [BMD]), and peripheral quantitative computed tomography (tibia trabecular and cortical BMD; calf muscle cross-sectional area)...
June 23, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28646325/anti-tuberculosis-bacteriophage-d29-delivery-with-a-vibrating-mesh-nebulizer-jet-nebulizer-and-soft-mist-inhaler
#6
Nicholas B Carrigy, Rachel Y Chang, Sharon S Y Leung, Melissa Harrison, Zaritza Petrova, Welkin H Pope, Graham F Hatfull, Warwick J Britton, Hak-Kim Chan, Dominic Sauvageau, Warren H Finlay, Reinhard Vehring
PURPOSE: To compare titer reduction and delivery rate of active anti-tuberculosis bacteriophage (phage) D29 with three inhalation devices. METHODS: Phage D29 lysate was amplified to a titer of 11.8 ± 0.3 log10(pfu/mL) and diluted 1:100 in isotonic saline. Filters captured the aerosolized saline D29 preparation emitted from three types of inhalation devices: 1) vibrating mesh nebulizer; 2) jet nebulizer; 3) soft mist inhaler. Full-plate plaque assays, performed in triplicate at multiple dilution levels with the surrogate host Mycobacterium smegmatis, were used to quantify phage titer...
June 23, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28618808/semi-analytical-modeling-of-ground-plate-interaction-for-general-elastic-boundary-conditions
#7
Loïc Grau, Bernard Laulagnet
This letter introduces ground/plate interaction using the concept of ground cross-modal impedance in the case of general elastic boundary conditions. Navier equations are generally used to account for ground vibration with two propagating waves, the dilatational wave and the shear wave. The plate equation of motion follows the Kirchhoff-Love hypothesis, where shear and rotational inertia are neglected in the plate thickness. The general elastic boundary conditions are expressed analytically through a two-dimensional Fourier series in the plate displacement solution...
June 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28605368/murine-short-axis-ventricular-heart-slices-for-electrophysiological-studies
#8
Gabriel Peinkofer, Juergen Hescheler, Marcel Halbach
Murine cardiomyocytes have been extensively used for in vitro studies of cardiac physiology and new therapeutic strategies. However, multicellular preparations of dissociated cardiomyocytes are not representative of the complex in vivo structure of cardiomyocytes, non-myocytes and extracellular matrix, which influences both mechanical and electrophysiological properties of the heart. Here we describe a technique to prepare viable ventricular slices of adult mouse hearts with a preserved in vivo like tissue structure, and demonstrate their suitability for electrophysiological recordings...
June 4, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28574408/effect-of-whole-body-vibration-training-on-quadriceps-strength-bone-mineral-density-and-functional-capacity-in-children-with-hemophilia-a-randomized-clinical-trial
#9
S El-Shamy
OBJECTIVES: The objective was to evaluate the effects of whole body vibration training on quadriceps strength, bone mineral density, and functional capacity in children with hemophilia. METHODS: Thirty children with hemophilia with age ranging from 9 to 13 years were selected and randomly assigned to either the study group that received whole body vibration training (30-40 Hz, 2-4 mm of peak-to-peak vertical plate displacement for 15 minutes/day, 3 days/week/ 12 weeks) plus the conventional physical therapy program or the control group that performed a conventional physical therapy program only...
June 1, 2017: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/28531144/impact-damage-localisation-with-piezoelectric-sensors-under-operational-and-environmental-conditions
#10
Mohammad Saleh Salmanpour, Zahra Sharif Khodaei, M H Ferri Aliabadi
Guided-wave structural health monitoring (SHM) systems with piezoelectric sensors are investigated for localisation of barely visible impact damage in CFRP plates under vibration and different thermal conditions. A single baseline set is used in a delay-and-sum algorithm with temperature correction for damage localisation in a large temperature range. Damage localisation is also demonstrated under transient thermal conditions, with signals recorded while the temperature is rapidly decreased. Damage severity due to successive impact events is studied under constant temperature...
May 22, 2017: Sensors
https://www.readbyqxmd.com/read/28515484/the-complex-tibial-organ-of-the-new-zealand-ground-weta-sensory-adaptations-for-vibrational-signal-detection
#11
Johannes Strauß, Kathryn Lomas, Laurence H Field
In orthopteran insects, a complex tibial organ has evolved to detect substrate vibrations and/or airborne sound. Species of New Zealand weta (Anostostomatidae) with tympanal ears on the foreleg tibia use this organ to communicate by sound, while in atympanate species (which communicate by substrate drumming) the organ is unstudied. We investigated the complex tibial organ of the atympanate ground weta, Hemiandrus pallitarsis, for vibration detection adaptations. This system contains four sensory components (subgenual organ, intermediate organ, crista acustica homolog, accessory organ) in all legs, together with up to 90 scolopidial sensilla...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28509870/sound-power-estimation-for-beam-and-plate-structures-using-polyvinylidene-fluoride-films-as-sensors
#12
Qibo Mao, Haibing Zhong
The theory for calculation and/or measurement of sound power based on the classical velocity-based radiation mode (V-mode) approach is well established for planar structures. However, the current V-mode theory is limited in scope in that it can only be applied to conventional motion sensors (i.e., accelerometers). In this study, in order to estimate the sound power of vibrating beam and plate structure by using polyvinylidene fluoride (PVDF) films as sensors, a PVDF-based radiation mode (C-mode) approach concept is introduced to determine the sound power radiation from the output signals of PVDF films of the vibrating structure...
May 16, 2017: Sensors
https://www.readbyqxmd.com/read/28484335/coupling-strength-assumption-in-statistical-energy-analysis
#13
T Lafont, N Totaro, A Le Bot
This paper is a discussion of the hypothesis of weak coupling in statistical energy analysis (SEA). The examples of coupled oscillators and statistical ensembles of coupled plates excited by broadband random forces are discussed. In each case, a reference calculation is compared with the SEA calculation. First, it is shown that the main SEA relation, the coupling power proportionality, is always valid for two oscillators irrespective of the coupling strength. But the case of three subsystems, consisting of oscillators or ensembles of plates, indicates that the coupling power proportionality fails when the coupling is strong...
April 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28481501/high-throughput-investigation-of-a-lead-free-aln-based-piezoelectric-material-mg-hf-xal1-xn
#14
Hung H Nguyen, Hiroyuki Oguchi, Le Van Minh, Hiroki Kuwano
We conducted a high-throughput investigation of the fundamental properties of (Mg,Hf)xAl1-xN thin films (0 < x < 0.24) aiming for developing high-performance AlN-based piezoelectric materials. For the high-throughput investigation, we prepared composition-gradient (Mg,Hf)xAl1-xN films grown on a Si(100) substrate at 600 °C by cosputtering AlN and MgHf targets. To measure the properties of the various compositions at different positions within a single sample, we used characterization techniques with spatial resolution...
May 16, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28469755/can-different-complex-training-improve-the-individual-phenomenon-of-post-activation-potentiation
#15
Zong-Rong Chen, Shin-Liang Lo, Min-Hsien Wang, Ching-Fang Yu, Hsien-Te Peng
The aims of the present study were (a) to determine whether the two types of complex training and vibration complex training would improve the individual phenomenon of post-activation potentiation (PAP) for every athlete in a team setting; and (b) to compare the acute effect of resistance and plyometric exercise, whole body vibration, complex training and vibration complex training on vertical jump performance. The participants were ten male division I college volleyball and basketball players. They were asked to perform three vertical jumps as a pre-test and were then randomly assigned to one of five PAP protocols, resistance exercise using half squat exercise, plyometric exercise using drop jumps with individualized drop height, whole body vibration using squats on a vibration plate, complex training combining resistance exercise with plyometric exercise, vibration complex training combining whole body vibration with plyometric exercise...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28436860/effect-on-high-intensity-fields-of-a-tough-hydrophone-with-hydrothermal-pzt-thick-film-vibrator-and-titanium-front-layer
#16
Nagaya Okada, Shinichi Takeuchi
A novel tough hydrophone was fabricated by depositing hydrothermally synthesized lead zirconate titanate polycrystalline film on the back-side surface of a titanium plate. Our developed tough hydrophone resisted damage in a high-pressure field (15 MPa) at a focal point of a sinusoidal continuous wave driven by a concave high-intensity focused ultrasound (HIFU) transducer with up to 50 W of power input to the sound source. The hydrophone was suitable for the HIFU field, even though the hydrophone has a flat-shape tip of 3...
July 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28425516/mechanical-and-vibrational-characterization-of-amyloid-like-het-s-nanosheets-based-on-the-skewed-plate-theory
#17
Hyun Joon Chang, Myeongsang Lee, Jae In Kim, Gwonchan Yoon, Sungsoo Na
Pathological amyloidogenic prion proteins have a toxic effect on functional cells in the human cerebrum because of poor degradability and the tendency to accumulate in an uncontrolled manner under physiological conditions. HET-s, a fungal prion protein, is known to undergo conformational variations from fibrillar to nanosheet structures during a change from low to high pH conditions. It has been said that this conformational change can lead to self-propagation by nucleating on the lateral surface of singlet fibrils...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28372094/vibration-damping-using-a-spiral-acoustic-black-hole
#18
Jae Yeon Lee, Wonju Jeon
This study starts with a simple question: can the vibration of plates or beams be efficiently reduced using a lightweight structure that occupies a small space? As an efficient technique to damp vibration, the concept of an acoustic black hole (ABH) is adopted with a simple modification of the geometry. The original shape of an ABH is a straight wedge-type profile with power-law thickness, with the reduction of vibration in beams or plates increasing as the length of the ABH increases. However, in real-world applications, there exists an upper bound of the length of an ABH due to space limitations...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28367593/analytical-and-numerical-stability-analysis-of-soret-driven-convection-in-a-horizontal-porous-layer-the-effect-of-vertical-vibrations
#19
Soumaya Ouadhani, Ali Abdennadher, Abdelkader Mojtabi
The authors studied the effect of vertical high-frequency and small-amplitude vibrations on the separation of a binary mixture saturating a porous cavity. The horizontal bottom plate was submitted to constant uniform heat flux and the top one was maintained at constant temperature while no mass flux was imposed. The influence of vertical vibrations on the onset of convection and on the stability of the unicellular flow was investigated for positive separation ratio [Formula: see text]. The case of high-frequency and small-amplitude vibrations was considered so that a formulation using time averaged equations could be used...
April 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28336861/modified-continuum-mechanics-modeling-on-size-dependent-properties-of-piezoelectric-nanomaterials-a-review
#20
REVIEW
Zhi Yan, Liying Jiang
Piezoelectric nanomaterials (PNs) are attractive for applications including sensing, actuating, energy harvesting, among others in nano-electro-mechanical-systems (NEMS) because of their excellent electromechanical coupling, mechanical and physical properties. However, the properties of PNs do not coincide with their bulk counterparts and depend on the particular size. A large amount of efforts have been devoted to studying the size-dependent properties of PNs by using experimental characterization, atomistic simulation and continuum mechanics modeling with the consideration of the scale features of the nanomaterials...
January 26, 2017: Nanomaterials
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