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vibration plate

Nataliya V Petrochenkova, Anatolii G Mirochnik, Tatyana B Emelina, Alexander A Sergeev, Andrei A Leonov, Sergey S Voznesenskii
The effect of methylamine vapor on luminescence of Eu(III) tris-benzoylacetonate (I) immobilized in thin-layer chromatography plates has been investigated. It has been revealed that interaction of I with analyte vapor results in increase of the intensity of Eu(III) luminescence. The mechanism of the effect of methylamine vapors on intensification of the Eu(III) luminescence has been suggested using the data of IR spectroscopy and quantum chemistry calculations. The mechanism of luminescence sensitization consists in bonding of an analyte molecule with a water molecule into the coordination sphere of Eu(III)...
April 3, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Taesung In, Kyoungsim Jung, Mingoo Lee, Hwi-Young Cho
OBJECTIVES: This study aimed to investigate the effects of whole-body vibration (WBV) training on ankle spasticity, balance, and walking ability in patients with incomplete spinal cord injury (iSCI) at cervical level. METHODS: Twenty-eight patients with cervical iSCI were randomly assigned to WBV (n = 14) or control group (n = 14). WBV group received WBV training, while control group was treated with placebo-treatment. All interventions were given for 20-min, twice a day, 5-days a week for 8-weeks...
April 7, 2018: NeuroRehabilitation
Emmanuel G Simon, Samuel Callé, Franck Perrotin, Jean-Pierre Remenieras
BACKGROUND: Placental elasticity may be modified in women with placental insufficiency. Shear wave elastography (SWE) can measure this, using acoustic radiation force, but the safety of its use in pregnant women has not yet been demonstrated. Transient elastography (TE) is a safer alternative, but has not yet been applied to the placenta. Moreover, the dispersion of shear wave speed (SWS) as a function of frequency has received relatively little study for placental tissue, although it might improve the accuracy of biomechanical assessment...
2018: PloS One
Jing Li, Ziyu Guo, Yinzhu Quan, Jian Li
INTRODUCTION: Truss core material, which is a new type of ultra-light material with comprehensive properties, is used in the aerospace industry. The aim of this paper is to investigate the dynamic behavior of three-dimensional Kagome sandwich plates with truss core under transverse and in-plane excitation in the case of 1:1 internal resonance. METHODS: Firstly, the averaged equation is obtained by means of the method of multiple scales. Then, the nonlinear system is analyzed applying the theory of normal form...
January 2018: Journal of Applied Biomaterials & Functional Materials
Brittany P Gordon, Frederick G Moore, Lawrence F Scatena, Nicholas Adam Valley, Sumi Natalie Wren, Geraldine L Richmond
Small atmospheric aldehydes and ketones are known to play a significant role in the formation of secondary organic aerosols (SOA). However, many of them are difficult to experimentally isolate, as they tend to form hydration and oligomer species. Hydroxyacetone (HA) is unusual in this class as it contributes to SOA while existing predominantly in its unhydrated monomeric form. In this paper the surface behavior of HA at the air-water interface has been investigated using vibrational sum frequency (VSF) spectroscopy and Wilhelmy plate surface tensiometry in combination with computational molecular dynamics simulations and density functional theory calculations...
April 2, 2018: Journal of Physical Chemistry. A
Shuguang Zuo, Haidong Huang, Xudong Wu, Minghai Zhang, Tianxin Ni
To achieve a wider band gap and a lower cut-on frequency, a locally resonant phononic crystal (LRPC) with a dual-base plate is investigated in this paper. Compared with the LRPC with a single plate, the band structure of the LRPC with a dual-base plate is calculated using the method of plane wave expansion and verified by the finite element method. According to the analysis of the band curves of the LRPC with a dual-base plate, the mechanisms are explained. Next, the influences of the thickness of the plates, the stiffness of the springs, the mass of resonators, and the lattice constant are also investigated...
March 2018: Journal of the Acoustical Society of America
Wojciech P Rdzanek
The problem of sound scattering and transmission through a circular cylindrical aperture in a flat thick rigid wall has been revisited rigorously using the radial polynomials. The acoustic power transmission and back scattering coefficients have been presented in the form of highly convergent hypergeometric series described earlier in the literature for vibrating circular pistons and plates based on the crucial property of the polynomials in terms of the Hankel transform. The problem is solved by using the continuity conditions at both aperture outlets...
March 2018: Journal of the Acoustical Society of America
Xiangxiong Kong, Jian Li
Self-loosening of bolts caused by repetitive loads and vibrations is one of the common defects that can weaken the structural integrity of bolted steel joints in civil structures. Many existing approaches for detecting loosening bolts are based on physical sensors and, hence, require extensive sensor deployment, which limit their abilities to cost-effectively detect loosened bolts in a large number of steel joints. Recently, computer vision-based structural health monitoring (SHM) technologies have demonstrated great potential for damage detection due to the benefits of being low cost, easy to deploy, and contactless...
March 28, 2018: Sensors
Nian Li, Bin Wang, Zhenghua Qian
Mindlin's two-dimensional theory has been derived and applied to research on quartz resonators for a long time. However, most works have focused on vibrations varying only in two directions, including thickness direction, while the effect of other directions like the length or width direction is normally neglected. Besides, researchers often model quartz resonators as fully electroded plates because of the resulting simplicity. Since a real device is finite in all directions and is only centrally electroded, results obtained in such works cannot offer quantitative information on vibrations with enough accuracy...
March 26, 2018: Sensors
G Malik, R A Swyka, V K Tiwari, X Fei, G A Applegate, D B Berkowitz
Herein we describe a formal thiocyanopalladation/carbocyclization transformation and its parametrization and optimization using a new elevated temperature plate-based version of our visual colorimetric enzymatic screening method for reaction discovery. The carbocyclization step leads to C-SCN bond formation in tandem with C-C bond construction and is highly stereoselective, showing nearly absolute 1,2- anti -stereoinduction (5 examples) for substrates bearing allylic substitution, and nearly absolute 1,3- syn -stereoinduction (16 examples) for substrates bearing propargylic substitution...
December 1, 2017: Chemical Science
Naser Nawayseh
Little is known about the transmission of vibration to the head when using whole-body vibration (WBV) training machines. This paper investigates the effect of frequency and posture on the transmission of vibration from a vibrating plate to the head of standing people. Nine male participants were exposed to vertical vibration at nine frequencies in the range of 17-46 Hz and vibration acceleration in the range of 7.85-18.64 m/s2 (peak). The participants adopted four standing postures described as standing with locked knee (LK), bent knee (BK), one leg (OL), and one foot to the front and the other to the back (FB)...
March 20, 2018: Sports Biomechanics
Qi Su, Qiquan Quan, Jie Deng, Hongpeng Yu
Inspired by a way of rowing, a new piezoelectric driving quadruped micro-robot operating in bending-bending hybrid vibration modes was proposed and tested in this work. The robot consisted of a steel base, four steel connecting pins and four similar driving legs, and all legs were bonded by four piezoelectric ceramic plates. The driving principle is discussed, which is based on the hybrid of first order vertical bending and first order horizontal bending vibrations. The bending-bending hybrid vibration modes motivated the driving foot to form an elliptical trajectory in space...
March 7, 2018: Sensors
Stephen C Conlon, Philip A Feurtado
Acoustic black holes (ABHs) have been explored and demonstrated to be effective passive treatments for broadband noise and vibration control. Performance metrics for assessing damping concepts are often focused on maximizing structural damping loss factors. Optimally performing damping treatments can reduce the resonant response of a driven system well below the direct field response. This results in a finite structure whose vibration input-output response follows that of an infinite structure. The vibration mobility transfer functions between locations on a structure can be used to assess the structure's vibration response phase, and compare its phase response characteristics to those of idealized systems...
February 2018: Journal of the Acoustical Society of America
Tyler J Flynn, David R Dowling
Acoustic radiation from a vibrating mechanical structure subject to broadband forcing is inherently dependent on the structure's material, geometry, and boundary conditions. Remote measurements of radiated sound can be used to detect mechanical changes (i.e., defects) when compared to known baseline measurements from the same structure. However, proper determination of a structure's acoustic signature may not be possible in highly reverberant environments due to reverberation contamination. Herein, experimental results are presented for the remote acoustic detection of clamped-boundary defects in a nominally 30 × 30 × 0...
February 2018: Journal of the Acoustical Society of America
Kun Yao, Qijing Lin, Zhuangde Jiang, Na Zhao, Bian Tian, Peng Shi, Gang-Ding Peng
A combined stress-vibration sensor was developed to measure stress and vibration simultaneously based on fiber Bragg grating (FBG) technology. The sensor is composed of two FBGs and a stainless steel plate with a special design. The two FBGs sense vibration and stress and the sensor can realize temperature compensation by itself. The stainless steel plate can significantly increase sensitivity of vibration measurement. Theoretical analysis and Finite Element Method (FEM) were used to analyze the sensor's working mechanism...
March 1, 2018: Sensors
Wei Li, Xiaoxue Xu, Wenjiang Li, Yun Zhao, Minfang Chen
A novel, cost-effective biomedical triboelectric nanogenerator (TENG) has been fabricated based on biocompatible medical 317L stainless steel (317L SS) and polylactic acid (PLLA) films as the friction layers, whose surface roughness designed by simple and low-cost laser etching and hot-embossing template methods, respectively. With the increase of the TENG's tribo-interface roughness and the molecular weight of the PLLA, the power output of TENG was greatly increased owing to more charges produced and excellent mechanical properties of PLLA possessed...
February 27, 2018: Nanotechnology
Maryam Dehbani, Masoud Rahimi
In the present study, Ultrasonic Falling Film (USFF), as a novel technique has been proposed to increase the evaporation rate of moderate temperature liquid film. It is a proper method for some applications which cannot be performed at high temperature, such as foodstuff industry, due to their sensitivity to high temperatures. Evaporation rate of sodium chloride solution from an USFF on an inclined flat plate compared to that for Falling Film without ultrasonic irradiation (FF) at various temperatures was investigated...
April 2018: Ultrasonics Sonochemistry
Yu Fu, Jianjun Yao, Zhenshuai Wan, Gang Zhao
In this paper, a modified Fourier series method is presented for the free vibration of moderately thick orthotropic functionally graded plates with general boundary restraints based on the first-order shear deformation theory. Regardless of boundary restraints, displacements and rotations of each plate are described as an improved form of double Fourier cosine series and several closed-form auxiliary functions to eliminate all the boundary discontinuities and jumps. Exact solutions are obtained by the energy functions of the plates based on Rayleigh-Ritz method...
February 9, 2018: Materials
Xu Tang, Yun Wang, Juan Han, Liang Ni, Huiqin Zhang, Cheng Li, Jing Li, Yue Qiu
At present, the design of multi ion sensing receptors is a new area of research due to their potential application in the recognition of analytes. Herein, a novel fluorescent probe for the detection of multi metal ions was designed and synthesized based on the fluorophores of biphenyl and rhodamine. Probe 1 exhibits multiple fluorescence responses to various metal ions (Zn2+, Al3+, Cr3+ and Fe3+) and is accompanied by different optical signal outputs. Moreover, the interference between the target ions can also be effectively solved by the introduction of probe 2 and the addition of the corresponding anions...
February 9, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Luay Fraiwan, Safi Amir, Fahad Ahmed, Junaid Halepota
There are an increased number of patients all over the world suffering from postural tremors and rest tremors, the types of tremors associated with Parkinson's disease and other neurodegenerative diseases such as amyotrophic lateral sclerosis. Currently, there is no cure for such disease and patients have to deal with their condition to continue their life normally with the existing of some helpful instruments. This work presents a self-stabilising Parkinson's disease (PD) Tray (platform) that can help them to carry objects that they hold with their hand...
February 7, 2018: Journal of Medical Engineering & Technology
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