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Rohan Kapoor, Subramanian Ramasamy, Alessandro Gardi, Chad Bieber, Larry Silverberg, Roberto Sabatini
Navigation and guidance systems are a critical part of any autonomous vehicle. In this paper, a novel sensor grid using 40 KHz ultrasonic transmitters is presented for adoption in indoor 3D positioning applications. In the proposed technique, a vehicle measures the arrival time of incoming ultrasonic signals and calculates the position without broadcasting to the grid. This system allows for conducting silent or covert operations and can also be used for the simultaneous navigation of a large number of vehicles...
October 8, 2016: Sensors
Pedro Santos, Geir Haugen, Lasse Lovstakken, Eigil Samset, Jan D'hooge
Several clinical settings could benefit from 3D high frame rate (HFR) imaging and in particular, HFR 3D Tissue Doppler Imaging (TDI). To date, the proposed methodologies are based mostly on experimental ultrasound platforms, making their translation to clinical systems non-trivial as these have additional hardware constraints. In particular, clinically used 2D matrix array transducers rely on sub-aperture (SAP) beamforming to limit cabling between the ultrasound probe and the back-end console. Therefore, the present study aimed at assessing the feasibility of HFR 3D TDI using diverging waves (DW) on a clinical transducer with SAP beamforming limitations...
October 10, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Tikhon Vergentev, Iurii Bronwald, Dmitry Chernyshov, Semen Gorfman, Stephanie H M Ryding, Paul Thompson, Robert J Cernik
Synchrotron X-rays on the Swiss Norwegian Beamline and BM28 (XMaS) at the ESRF have been used to record the diffraction response of the PMN-PT relaxor piezoelectric 67% Pb(Mg1/3Nb2/3)O3-33% PbTiO3 as a function of externally applied electric field. A DC field in the range 0-18 kV cm(-1) was applied along the [001] pseudo-cubic direction using a specially designed sample cell for in situ single-crystal diffraction experiments. The cell allowed data to be collected on a Pilatus 2M area detector in a large volume of reciprocal space using transmission geometry...
October 1, 2016: Journal of Applied Crystallography
Alvaro Molina-Cruz, Martine M Zilversmit, Daniel E Neafsey, Daniel L Hartl, Carolina Barillas-Mury
Plasmodium falciparum malaria remains a devastating public health problem. Recent discoveries have shed light on the origin and evolution of Plasmodium parasites and their interactions with their vertebrate and mosquito hosts. P. falciparum malaria originated in Africa from a single horizontal transfer between an infected gorilla and a human, and became global as the result of human migration. Today, P. falciparum malaria is transmitted worldwide by more than 70 different anopheline mosquito species. Recent studies indicate that the mosquito immune system can be a barrier to malaria transmission and that the P...
October 3, 2016: Annual Review of Genetics
Sara C Caddigan, Alaina C Pfenning, Timothy C Sparkes
The acanthocephalan Acanthocephalus dirus is a trophically transmitted parasite that modifies both the physiology and behavior of its intermediate host (isopod) prior to transmission to its definitive host (fish). Infected isopods often contain multiple A. dirus individuals and we examined the relationships between host sharing, body size, energy content, and host modification to determine if host sharing was costly and if these costs could influence the modification of host behavior (mating behavior). Using field-based measures of parasite energy content (glycogen, lipid) and parasite body size (volume), we showed that host sharing was costly in terms of energy content but not in terms of body size...
October 10, 2016: Parasitology Research
Yi Liu, Nathalie Claes, Bastian Trepka, Sara Bals, Peter R Lang
In this article we report on the synthesis and characterization of a system of colloidal spheres suspended in an aqueous solvent which can be refractive index-matched, thus allowing for investigations of the particle near-wall dynamics by evanescent wave dynamic light scattering at concentrations up to the isotropic to ordered transition and beyond. The particles are synthesized by copolymerization of a fluorinated acrylic ester monomer with a polyethylene-glycol (PEG) oligomer by surfactant free emulsion polymerization...
September 5, 2016: Soft Matter
Liulin Deng, Yehia M Ibrahim, Sandilya V B Garimella, Ian K Webb, Ahmed M Hamid, Randolph V Norheim, Spencer A Prost, Jeremy A Sandoval, Erin S Baker, Richard D Smith
The initial use of traveling waves (TW) for ion mobility (IM) separations using structures for lossless ion manipulations (SLIM) employed an ion funnel trap (IFT) to accumulate ions from a continuous electrospray ionization source and was limited to injected ion populations of ∼10(6) charges due to the onset of space charge effects in the trapping region. Additional limitations arise due to the loss of resolution for the injection of ions over longer periods, such as in extended pulses. In this work a new SLIM "flat funnel" (FF) module has been developed and demonstrated to enable the accumulation of much larger ion populations and their injection for IM separations...
October 7, 2016: Analytical Chemistry
Mohammad Ali Azizi Ganzagh, Mardali Yousefpour, Zahra Taherian
In this study, the synthesis of SBA-15/Ag nanocomposite materials with different amounts of silver (2.5, 5, and 10 %) has been investigated under acidic conditions by using P123 as a template via the direct method. The nanocomposites of SBA-15 were synthesized by the same method and by the addition of silver salt. Finally, the nanocomposite materials were examined for the removal of mercury ions from wastewater as an adsorbent by the reverse titration method. Characterization was carried out through x-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 adsorption-desorption (Brunauer-Emmett-Teller)...
October 2016: Journal of Chemical Biology
Jerzy Krupka, Bartlomiej Salski, Pawel Kopyt, Wojciech Gwarek
Numerical solutions of coupled Maxwell and Landau-Lifshitz-Gilbert equations for a magnetized yttrium iron garnet (YIG) sphere acting as a one-stage filter are presented. The filter is analysed using finite-difference time-domain technique. Contrary to the state of the art, the study shows that the maximum electromagnetic power transmission through the YIG filter occurs at the frequency of the magnetic plasmon resonance with the effective permeability of the gyromagnetic medium μr ≈ -2, and not at a ferromagnetic resonance frequency...
October 4, 2016: Scientific Reports
Ferenc Liebig, Andreas F Thunemann, Joachim Koetz
The mechanism of nanotriangle formation in multivesicular vesicles (MMV) is investigated by using time dependent SAXS measurements in combination with UV-vis spectroscopy, light and transmission electron microscopy. In the first time period 6.5 nm sized spherical gold nanoparticles are formed inside of the vesicles, which build up soft nanoparticle aggregates. In situ SAXS experiments show a linear increase of the volume and molar mass of nanotriangles in the second time period. The volume growth rate of the triangles is 16...
October 3, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
M D'Arienzo, M L Cozzella, A Fazio, P De Felice, G Iaccarino, M D'Andrea, S Ungania, M Cazzato, K Schmidt, S Kimiaei, L Strigari
Peptide receptor therapy with (177)Lu-labelled somatostatin analogues is a promising tool in the management of patients with inoperable or metastasized neuroendocrine tumours. The aim of this work was to perform accurate activity quantification of (177)Lu in complex anthropomorphic geometry using advanced correction algorithms. Acquisitions were performed on the higher (177)Lu photopeak (208keV) using a Philips IRIX gamma camera provided with medium-energy collimators. System calibration was performed using a 16mL Jaszczak sphere surrounded by non-radioactive water...
September 28, 2016: Physica Medica: PM
Faria Fatima, Smita Rastogi Verma, Neelam Pathak, Preeti Bajpai
Myconanotechnology, a combination of mycology and nanotechnology that deals with the synthesis of nanoparticles using fungi or their metabolites, has great potential in the area of agriculture owing to the high surface-to-volume ratio and excellent biomedical, electronic, mechanical and physicochemical properties of these myconanoparticles. Extracellular mycosynthesis of Aspergillus flavus (KF934407) silver nanoparticles (AgNPs) was performed, which were produced by redox reaction. Furthermore, the extracellular synthesised AgNPs were characterised by ultraviolet/visible spectrophotometry, differential light scattering (DLS) and transmission electron microscopy...
September 13, 2016: Journal of Global Antimicrobial Resistance
Hao Wu, Fan Jiang, Haizhen Yue, Qiaoqiao Hu, Jian Zhang, Zhuolun Liu, Jian Gong, Sha Li, Jianhao Geng, Yibao Zhang
The unwanted radiation transmission through the multileaf collimators could be reduced by the jaw tracking technique which is commercially available on Varian TrueBeam accelerators. On the basis of identical plans, this study aims to investigate the dosimetric impact of jaw tracking on the volumetric-modulated arc therapy (VMAT) plans. Using Eclipse treatment planning system (TPS), 40 jaw-tracking VMAT plans with various tumor volumes and shapes were optimized. Fixed jaw plans were created by editing the jaw coordinates of the jaw-tracking plans while other parameters were identical...
2016: Journal of Applied Clinical Medical Physics
Krishnappan Chockkalingam, Chandrasekaran Anu Radha, Vendhan Subramani, Vendhan Subramani, Madhan Kumar Gunasekaran
The purpose of this study is to evaluate the degree of dose distribution distortion in advanced treatments like IMRT and RapidArc when patient plans are swapped across dosimetrically equivalent so-called "beam-matched" machines. For this purpose the entire work is divided into two stages. At forefront stage all basic beam properties of 6 MV X-rays like PDD, profiles, output factors, TPR20/10 and MLC transmission of two beam-matched machines - Varian Clinac iX and Varian 600 C/D Unique - are compared and evaluated for differences...
2016: Journal of Applied Clinical Medical Physics
Anna Likos, Isabel Griffin, Andrea M Bingham, Danielle Stanek, Marc Fischer, Stephen White, Janet Hamilton, Leah Eisenstein, David Atrubin, Prakash Mulay, Blake Scott, Patrick Jenkins, Danielle Fernandez, Edhelene Rico, Leah Gillis, Reynald Jean, Marshall Cone, Carina Blackmore, Janet McAllister, Chalmers Vasquez, Lillian Rivera, Celeste Philip
During the first 6 months of 2016, large outbreaks of Zika virus disease caused by local mosquito-borne transmission occurred in Puerto Rico and other U.S. territories, but local mosquito-borne transmission was not identified in the continental United States (1,2). As of July 22, 2016, the Florida Department of Health had identified 321 Zika virus disease cases among Florida residents and visitors, all occurring in either travelers from other countries or territories with ongoing Zika virus transmission or sexual contacts of recent travelers...
2016: MMWR. Morbidity and Mortality Weekly Report
Paramita Ray, Jennifer L Gray, John V Badding, Angela D Lueking
The high-pressure reactivity of caged olefinic carbons and polyatomic aromatic hydrocarbons (PAHs) are of interest because of their ability to produce unique C-H networks with varying geometries and bonding environments. Here, we have selected triptycene to explore the creation of pores via high-pressure polymerization. Triptycene has internal free volume on a molecular scale that arises due to its paddle wheel-like structure, formed via fusion of three benzene rings via sp(3)-hybridized bridgehead carbon sites...
October 17, 2016: Journal of Physical Chemistry. B
Xiu Lin, Lingling Fu, Yuan Chen, Runliang Zhu, Shuangyin Wang, Zhigang Liu
Mesoporous hollow silica spheres have been drawing tremendous interest due to their special structure and properties and potential applications. Here we synthesized a nanoreactor via ship-in-bottle method, encapsulated with Mn-N-C by heating manganese porphyrin in nanocages of mesoporous hollow silica spheres. And manganese porphyrin is first encapsulated and confined in the hollow spheres. The nanoreactors are investigated through transmission electron microscopy (TEM) and high angle annular dark field scanning TEM (HAADF-STEM) as well as nitrogen adsorption-desorption isotherms...
October 12, 2016: ACS Applied Materials & Interfaces
Thibault Caspar, Anthony Schultz, Mickaël Schaeffer, Aïssam Labani, Mi-Young Jeung, Paul Thomas Jurgens, Soraya El Ghannudi, Catherine Roy, Mickaël Ohana
OBJECTIVES: To compare cine MR b-TFE sequences acquired before and after gadolinium injection, on a 3T scanner with a parallel RF transmission technique in order to potentially improve scanning time efficiency when evaluating LV function. METHODS: 25 consecutive patients scheduled for a cardiac MRI were prospectively included and had their b-TFE cine sequences acquired before and right after gadobutrol injection. Images were assessed qualitatively (overall image quality, LV edge sharpness, artifacts and LV wall motion) and quantitatively with measurement of LVEF, LV mass, and telediastolic volume and contrast-to-noise ratio (CNR) between the myocardium and the cardiac chamber...
2016: PloS One
Markus Weiler, Christoph Menzel, Thomas Pertsch, Rasoul Alaee, Carsten Rockstuhl, Claudia Pacholski
The high potential of bottom-up fabrication strategies for realizing sophisticated optical sensors combining the high sensitivity of a surface plasmon resonance with the exceptional properties of stimuli-responsive hydrogel is demonstrated. The sensor is composed of a periodic hole array in a gold film whose holes are filled with gold-capped poly(N-isoproyl-acrylamide) (polyNIPAM) microspheres. The production of this sensor relies on a pure chemical approach enabling simple, time-efficient, and cost-efficient preparation of sensor platforms covering areas of cm(2)...
October 5, 2016: ACS Applied Materials & Interfaces
Noriko Shimasaki, Masayuki Hara, Ritsuko Kikuno, Katsuaki Shinohara
To prevent nosocomial infections caused by even either Ebola virus or methicillin-resistant Staphylococcus aureus (MRSA), healthcare workers must wear the appropriate protective clothing which can inhibit contact transmission of these pathogens. Therefore, it is necessary to evaluate the performance of protective clothing for penetration resistance against infectious agents. In Japan, some standard methods were established to evaluate the penetration resistance of protective clothing fabric materials under applied pressure...
2016: Biocontrol Science
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