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https://www.readbyqxmd.com/read/28214750/propagation-of-thickness-shear-waves-in-a-periodically-corrugated-quartz-crystal-plate-and-its-application-exploration-in-acoustic-wave-filters
#1
Peng Li, Li Cheng
The propagation of thickness shear waves in a periodically corrugated quartz crystal plate is investigated in the present paper using a power series expansion technique. In the proposed simulation model, an equivalent continuity of shear stress moment is introduced as an approximation to handle sectional interfaces with abrupt thickness changes. The Bloch theory is applied to simulate the band structures for three different thickness variation patterns. It is shown that the power series expansion method exhibits good convergence and accuracy, in agreement with results by finite element method (FEM)...
February 7, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28211890/local-melting-to-design-strong-and-plastically-deformable-bulk-metallic-glass-composites
#2
Yue-Sheng Qin, Xiao-Liang Han, Kai-Kai Song, Yu-Hao Tian, Chuan-Xiao Peng, Li Wang, Bao-An Sun, Gang Wang, Ivan Kaban, Jürgen Eckert
Recently, CuZr-based bulk metallic glass (BMG) composites reinforced by the TRIP (transformation-induced plasticity) effect have been explored in attempt to accomplish an optimal of trade-off between strength and ductility. However, the design of such BMG composites with advanced mechanical properties still remains a big challenge for materials engineering. In this work, we proposed a technique of instantaneously and locally arc-melting BMG plate to artificially induce the precipitation of B2 crystals in the glassy matrix and then to tune mechanical properties...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28208709/human-exposure-to-electromagnetic-fields-from-parallel-wireless-power-transfer-systems
#3
Feng Wen, Xueliang Huang
The scenario of multiple wireless power transfer (WPT) systems working closely, synchronously or asynchronously with phase difference often occurs in power supply for household appliances and electric vehicles in parking lots. Magnetic field leakage from the WPT systems is also varied due to unpredictable asynchronous working conditions. In this study, the magnetic field leakage from parallel WPT systems working with phase difference is predicted, and the induced electric field and specific absorption rate (SAR) in a human body standing in the vicinity are also evaluated...
February 8, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28207855/novel-approaches-for-the-taxonomic-and-metabolic-characterization-of-lactobacilli-integration-of-16s-rrna-gene-sequencing-with-maldi-tof-ms-and-1h-nmr
#4
Claudio Foschi, Luca Laghi, Carola Parolin, Barbara Giordani, Monica Compri, Roberto Cevenini, Antonella Marangoni, Beatrice Vitali
Lactobacilli represent a wide range of bacterial species with several implications for the human host. They play a crucial role in maintaining the ecological equilibrium of different biological niches and are essential for fermented food production and probiotic formulation. Despite the consensus about the 'health-promoting' significance of Lactobacillus genus, its genotypic and phenotypic characterization still poses several difficulties. The aim of this study was to assess the integration of different approaches, genotypic (16S rRNA gene sequencing), proteomic (MALDI-TOF MS) and metabolomic (1H-NMR), for the taxonomic and metabolic characterization of Lactobacillus species...
2017: PloS One
https://www.readbyqxmd.com/read/28195400/hypersonic-poration-a-new-versatile-cell-poration-method-to-enhance-cellular-uptake-using-a-piezoelectric-nano-electromechanical-device
#5
Zhixin Zhang, Yanyan Wang, Hongxiang Zhang, Zifan Tang, Wenpeng Liu, Yao Lu, Zefang Wang, Haitao Yang, Wei Pang, Hao Zhang, Daihua Zhang, Xuexin Duan
Efficient delivery of genes and therapeutic agents to the interior of the cell is critical for modern biotechnology. Herein, a new type of chemical-free cell poration method-hypersonic poration-is developed to improve the cellular uptake, especially the nucleus uptake. The hypersound (≈GHz) is generated by a designed piezoelectric nano-electromechanical resonator, which directly induces normal/shear stress and "molecular bombardment" effects on the bilayer membranes, and creates reversible temporal nanopores improving the membrane permeability...
February 13, 2017: Small
https://www.readbyqxmd.com/read/28194365/antibacterial-effect-of-urushiol-on-e-faecalis-as-a-root-canal-irrigant
#6
Sang-Wan Kim, Dong-Hoon Shin
OBJECTIVES: The purpose of this study was to compare the antibacterial activity of urushiol against Enterococcus faecalis (E. faecalis) to that of NaOCl. MATERIALS AND METHODS: The canals of thirty two single rooted human teeth were instrumented with Ni-Ti files (ProTaper Next X1, X2, X3, Dentsply). A pure culture of E. faecalis ATCC 19433 was prepared in sterile brain heart infusion (BHI) broth. The teeth were submerged in the suspension of E. faecalis and were incubated at 37℃ for 7 days to allow biofilm formation...
February 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28186464/evaluation-of-antimicrobial-photodynamic-therapy-using-indocyanine-green-and-near-infrared-diode-laser-against-enterococcus-faecalis-in-infected-human-root-canals
#7
Charis Beltes, Nikolaos Economides, Hercules Sakkas, Chrissanthy Papadopoulou, Theodoros Lambrianidis
OBJECTIVE: Photodynamic therapy (PDT) is considered a promising adjunct to the currently available endodontic disinfection techniques leading to more effective reduction of intracanal bacteria. The present ex vivo study aimed to assess the antimicrobial effect of PDT using indocyanine green (ICG) as photosensitizer and a near-infrared (NIR) diode laser in root canals of human teeth infected with Enterococcus faecalis. MATERIALS AND METHODS: Ninety single-rooted teeth after chemomechanical preparation and sterilization were contaminated with an E...
February 9, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28182500/validity-of-various-methods-for-determining-velocity-force-and-power-in-the-back-squat
#8
Harry G Banyard, Ken Nosaka, Kimitake Sato, G Gregory Haff
PURPOSE: This investigation examined the validity of two kinematic systems for assessing mean velocity (MV), peak velocity (PV), mean force (MF), peak force (PF), mean power (MP), and peak power (PP) during the full depth free-weight back squat performed with maximal concentric effort. METHODS: Ten strength-trained men (26.1±3.0 y; 1.81±0.07 m; 82.0±10.6 kg) performed three 1-repetition maximum (1RM) trials on three separate days, encompassing lifts performed at six relative intensities including 20, 40, 60, 80, 90, and 100% of 1RM...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28181514/new-2d-diffraction-model-and-its-applications-to-terahertz-parallel-plate-waveguide-power-splitters
#9
Fan Zhang, Kaijun Song, Yong Fan
A two-dimensional (2D) diffraction model for the calculation of the diffraction field in 2D space and its applications to terahertz parallel-plate waveguide power splitters are proposed in this paper. Compared with the Huygens-Fresnel principle in three-dimensional (3D) space, the proposed model provides an approximate analytical expression to calculate the diffraction field in 2D space. The diffraction filed is regarded as the superposition integral in 2D space. The calculated results obtained from the proposed diffraction model agree well with the ones by software HFSS based on the element method (FEM)...
February 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28167875/locking-plate-arthrodesis-compares-favorably-with-lrti-for-thumb-trapeziometacarpal-arthrosis-early-outcomes-from-a-longitudinal-cohort-study
#10
Nikolas H Kazmers, K J Hippensteel, Ryan P Calfee, Lindley B Wall, Martin I Boyer, Charles A Goldfarb, Richard H Gelberman, Daniel A Osei
BACKGROUND: Trapeziometacarpal arthrodesis (TMA) has been complicated by nonunion and hardware failure. QUESTIONS/PURPOSES: We hypothesized that modification of the TMA technique with a locking cage plate construct would afford reliable bony union while producing greater hand function than trapeziectomy with ligament reconstruction and tendon interposition (LRTI) at early follow-up. METHODS: We enrolled 36 consecutive patients with trapeziometacapal osteoarthritis (14 TMA patients (15 thumbs), 22 LRTI patients (22 thumbs))...
February 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28157908/reflection-zone-plate-concept-for-resonant-inelastic-x-ray-scattering-spectrometry
#11
Christoph Braig, Heike Löchel, Jens Rehanek, Alexander Firsov, Maria Brzhezinskaya, Alexei Erko
We simulate a proof-of-principle design of a wavelength dispersive, parallel spectrometer for use in resonant inelastic x-ray scattering (RIXS). The instrument relies on a multiple-channel reflection zone plate (RZP) array, enabling the recording of fluorescence spectra from an acceptance angle of 18  arc min×19  arc min with a mainly source-size-limited resolving power of (0.2-2.6)×10<sup>4</sup> over an energy range of 21 eV at the L-edge of Fe around 715 eV. An optimal two-dimensional signal readout preserves the spectral resolution to a large extent for widely open exit apertures of ≳50  mm<sup>2</sup>...
January 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28153290/immobilized-fusion-protein-affinity-chromatography-combined-with-hplc-esi-q-tof-ms-ms-for-rapid-screening-of-ppar%C3%AE-ligands-from-natural-products
#12
Junfeng Zhu, Xiaojiao Yi, Wenhui Liu, Yingchun Xu, Shuqing Chen, Yongjiang Wu
Screening agonists of peroxisome proliferator-activated receptor-γ (PPARγ) from natural products is particularly motivated by the need for effective anti-diabetic agents. However, method for direct identification of PPARγ ligands from a complex sample is rarely reported. Here we propose a novel immobilized fusion protein affinity chromatography (IFPAC) to achieve rapid multicomponent screening. First, functional human PPARγ ligand binding domain (hPPARγLBD) was bacterially produced by fusion to glutathione S-transferase (GST)...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28149408/maximal-power-of-the-lower-limbs-of-youth-gymnasts-and-biomechanical-indicators-of-the-forward-handspring-vault-versus-the-sports-result
#13
Andrzej Kochanowicz, Kazimierz Kochanowicz, Bartłomiej Niespodziúski, Jan Mieszkowski, Piotr Aschenbrenner, Grzegorz Bielec, Mirosława Szark-Eckardt
The aim of the study was to define the relationship between maximal power of lower limbs, the biomechanics of the forward handspring vault and the score received during a gymnastics competition. The research involved 42 gymnasts aged 9-11 years competing in the Poland's Junior Championships. The study consisted of three stages: first -estimating the level of indicators of maximal power of lower limbs tested on a force plate during the countermovement jump; second - estimating the level of biomechanical indicators of the front handspring vault...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149403/effect-of-drop-jump-technique-on-the-reactive-strength-index
#14
Artur Struzik, Grzegorz Juras, Bogdan Pietraszewski, Andrzej Rokita
The basic drill of plyometric training aimed at improving lower limb power and jump height is a drop jump. This exercise can be performed using different techniques, which substantially affects jump variables. Therefore, the aim of this study was to compare the values of the reactive strength index (RSI) for countermovement drop jumps (CDJs) and bounce drop jumps (BDJs). The study was carried out in a group of 8 male youth basketball players. The tests were conducted using the AMTI BP600900 force plate to measure ground reaction forces and the Noraxon MyoMotion system to record kinematic data...
September 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149401/transfer-of-mechanical-energy-during-the-shot-put
#15
Michalina Błażkiewicz, Barbara Łysoń, Adam Chmielewski, Andrzej Wit
The aim of this study was to analyse transfer of mechanical energy between body segments during the glide shot put. A group of eight elite throwers from the Polish National Team was analysed in the study. Motion analysis of each throw was recorded using an optoelectronic Vicon system composed of nine infrared camcorders and Kistler force plates. The power and energy were computed for the phase of final acceleration of the glide shot put. The data were normalized with respect to time using the algorithm of the fifth order spline and their values were interpolated with respect to the percentage of total time, assuming that the time of the final weight acceleration movement was different for each putter...
September 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28147686/center-conductor-diagnostic-for-multipactor-detection-in-inaccessible-geometries
#16
Vernon H Chaplin, Aimee A Hubble, Kathryn A Clements, Timothy P Graves
Electron collecting current probes are the most reliable diagnostic of multipactor and radiofrequency (RF) ionization breakdown; however, stand-alone probes can only be used in test setups where the breakdown region is physically accessible. This paper describes techniques for measuring multipactor current directly on the center conductor of a coaxial RF device (or more generally, on the signal line in any two-conductor RF system) enabling global multipactor detection with improved sensitivity compared to other common diagnostics such as phase null, third harmonic, and reflected power...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28147584/the-symmetry-and-coupling-properties-of-solutions-in-general-anisotropic-multilayer-waveguides
#17
F Hernando Quintanilla, M J S Lowe, R V Craster
Multilayered plate and shell structures play an important role in many engineering settings where, for instance, coated pipes are commonplace such as in the petrochemical, aerospace, and power generation industries. There are numerous demands, and indeed requirements, on nondestructive evaluation (NDE) to detect defects or to measure material properties using guided waves; to choose the most suitable inspection approach, it is essential to know the properties of the guided wave solutions for any given multilayered system and this requires dispersion curves computed reliably, robustly, and accurately...
January 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28146505/high-efficiency-supercontinuum-generation-in-solid-thin-plates-at-0-1%C3%A2-%C3%A2-tw-level
#18
Peng He, Yangyang Liu, Kun Zhao, Hao Teng, Xinkui He, Pei Huang, Hangdong Huang, Shiyang Zhong, Yujiao Jiang, Shaobo Fang, Xun Hou, Zhiyi Wei
Supercontinuum generation in a solid-state medium was investigated experimentally. A continuum covering 460 to 950 nm was obtained when 0.8 mJ/30 fs Ti:sapphire laser pulses were applied to seven thin fused silica plates at a 1 kHz repetition rate. The primary processes responsible for spectral broadening were self-phase modulation (SPM) and self-steepening, while SPM and self-focusing were balanced to optimize the spectral broadening and suppress the multiphoton process. The output was compressed to a 5.4 fs and a 0...
February 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28145128/small-prizes-improve-food-selection-in-a-school-cafeteria-without-increasing-waste
#19
Michelle E Hudgens, Allison S Barnes, Mary Kate Lockhart, Samantha C Ellsworth, Monna Beckford, Robert M Siegel
We recently demonstrated that small prizes given for a "Power Plate" (plain fat-free milk, entrée, fruit and vegetable) can be used in an elementary school cafeteria to increase healthful food selection by over 300%. The purpose of this study was to measure changes in food waste when the Power Plate (PP) program is implemented. The PP intervention was conducted at an inner-city elementary school. Emoticons were placed next to the preferred foods and children were given a small prize if they selected the PP...
February 2017: Clinical Pediatrics
https://www.readbyqxmd.com/read/28140381/modulation-power-of-porous-materials-and-usage-as-ripple-filter-in-particle-therapy
#20
Toke Printz Ringbæk, Yuri Simeonov, Matthias Witt, Rita Engenhart-Cabillic, Gerhard Kraft, Klemens Zink, Uli Weber
Porous materials with microscopic structures like foam, sponges, lung tissues and lung substitute materials have particular characteristics, which differ from those of solid materials. Ion beams passing through porous materials show much stronger energy straggling than expected for non-porous solid materials of the same thickness. This effect depends on the microscopic structure, the density and the thickness of the porous material. The beam-modulating effect from a porous plate enlarges the Bragg peak, yielding similar benefits in irradiation time reduction as a ripple filter...
January 31, 2017: Physics in Medicine and Biology
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