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https://www.readbyqxmd.com/read/28441498/thin-wall-gan-inaln-multiple-quantum-well-tubes
#1
Christophe Durand, Jean-François Carlin, Catherine Bougerol, Bruno Gayral, Damien Salomon, Jean-Paul Barnes, Joel Eymery, Raphael Butte, Nicolas Grandjean
Thin-wall tubes composed of nitride semiconductors (III-N compounds) based on GaN/InAlN multiple quantum wells (MQWs) are fabricated by metal-organic vapor-phase epitaxy in a simple and full III-N approach. The synthesis of such MQW-tubes is based on the growth of N-polar c-axis vertical GaN wires surrounded by a core-shell MQW heterostructure followed by in situ selective etching using controlled H2/NH3 annealing at 1010°C to remove the inner GaN wire part. After this process, well-defined MQW-based tubes having non-polar m-plane orientation exhibit UV light near 330 nm up to room temperature, consistent with the emission of GaN/InAlN MQWs...
April 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28440836/controllable-hydrothermal-synthesis-of-ni-h-bea-with-a-hierarchical-core-shell-structure-and-highly-enhanced-biomass-hydrodeoxygenation-performance
#2
Bing Ma, Huimei Cui, Darui Wang, Peng Wu, Chen Zhao
Ni based catalysts are wildly used in catalytic industrial processes due to their low costs and high activities. The design of highly hierarchical core-shell structured Ni/HBEA is achieved using a sustainable, simple, and easy-tunable hydrothermal synthesis approach using combined NH4Cl and NH3·H2O as a co-precipitation agent at 120 °C. Starting from a single-crystalline hierarchical H(+)-exchanged beta polymorph zeolite (HBEA), the adjustment of the precipitate conditions shows that mixed NH4Cl and NH3·H2O precipitates with proper concentrations are vital in the hydrothermal synthesis for preserving a good crystalline morphology of HBEA and generating abundant highly-dispersed Ni nanoparticles (loading: 41 wt%, 5...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440613/constructing-a-heterostructural-lini0-4mn1-6o4-%C3%AE-material-from-concentration-gradient-framework-to-significantly-improve-its-cycling-performance
#3
Fang Lian, Fan Zhang, Lin Yang, Leilei Ma, Yadi Li
A heterostructural LiNi0.35Mn1.65O4-δ-LiNi0.5Mn1.5O4 was achieved via constructing the concentration-gradient material with an average composition of LiNi0.4Mn1.6O4-δ. The as-obtained samples have been characterized by the cross sectional scanning electron microscopy (SEM) and energy dispersive x-ray spectrometry (EDS) that the core material LiNi0.35Mn1.65O4-δ is encapsulated completely by a concentration-gradient shell with the outmost layer of LiNi0.5Mn1.5O4. Demonstrated by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) analysis with low-energy Ar neutral beam etching method, the structurally stable P4332 phase on the surface coordinates the high conductive Fd-3m phase in the bulk without any detectable interface...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440104/the-cut-off-point-for-tympanic-temperature-as-a-heat-strain-index-for-evaluation-of-outdoor-workers-a-field-study
#4
Hamidreza Heidari, Farideh Golbabaei, Aliakbar Shamsipour, Abbas Rahimi Forushani, Abbasali Gaeini
INTRODUCTION: The aims of this study were (a) to assess agreement coefficient between tympanic temperatures and the most popular and valid heat stress index, wet bulb globe temperature (WBGT), in outdoor environments and (b) to determine a cut-off point for tympanic temperature as a heat strain index for evaluation of outdoor workers. METHOD: 1452 measurements of WBGT index and tympanic temperature were recorded for outdoor workers from nine different climatic regions...
April 25, 2017: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/28439740/synthetic-cold-inducible-promoter-enhances-recombinant-protein-accumulation-during-agrobacterium-mediated-transient-expression-in-nicotiana-excelsior-at-chilling-temperatures
#5
I M Gerasymenko, Y V Sheludko
OBJECTIVES: To exploit cold-inducible biochemical processes beneficial for foreign mRNA transcription, translation and storage, as well as protein product stability, during Agrobacterium-mediated transient expression. RESULTS: The efficiency of three different 5'-regulatory sequences to achieve transient expression of the GFP-based reporter gene under chilling conditions (6-8 °C since the 3rd day post inoculation) was compared. We studied the upstream sequences of a cold-inducible Arabidopsis thaliana cor15a gene, the core element of 35S CaMV promoter fused to the TMV omega 5'-UTR, and the synthetic promoter including the 35S core sequence and two binding sites for cold-inducible CBF transcription factors (P_DRE::35S)...
April 24, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28438982/the-histaminergic-system-is-involved-in-psychological-stress-induced-hyperthermia-in-rats
#6
Battuvshin Lkhagvasuren, Takakazu Oka
The histaminergic system modulates numerous physiological functions such as wakefulness, circadian rhythm, feeding, and thermoregulation. However, it is not yet known if this system is also involved in psychological stress-induced hyperthermia (PSH) and, if so, which histamine (H) receptor subtype mediates the effect. Therefore, we investigated the effects of pretreatments with intraperitoneal injections of mepyramine (an H1 receptor inverse agonist), cimetidine (an H2 receptor antagonist), and ciproxifan (an H3 receptor inverse agonist) on cage-exchange stress-induced hyperthermia (a model of PSH) by monitoring core body temperature (Tc) during both light (10:00 am-12:00 pm) and dark (10:00 pm-12:00 am) phases in conscious, freely moving rats...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28437906/temperature-insensitive-fiber-optic-fabry-perot-interferometer-based-on-special-air-cavity-for-transverse-load-and-strain-measurements
#7
Yongfeng Wu, Yundong Zhang, Jing Wu, Ping Yuan
We experimentally demonstrate transverse load and strain sensing based on a fiber optic Fabry-Perot interferometer (FPI) with special air cavity, which was created by fusion splicing single mode fiber (SMF), hollow core fiber (HCF) and several electrical arc discharges. The cavity height of this structure is higher than the cladding diameter of SMF so that it can sense transverse load with high sensitivity. The transverse load sensitivity of this air cavity FPI sensor is 1.31 nm∕N and about 5 times more sensitive compared to the current fiber tip interferometer (0...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437902/high-performance-temperature-sensing-using-a-selectively-filled-solid-core-photonic-crystal-fiber-with-a-central-air-bore
#8
J Ma, H H Yu, X Jiang, D S Jiang
A high-performance temperature sensor based on mode-coupling principle is proposed using a selectively filled, solid-core photonic crystal fiber with a central air-bore. The fibers are fabricated using the "stack-and-draw" method, with a micro scale central bore deliberately kept during the drawing procedure. The addition of the central air-bore enhances the mode-coupling efficiency between the fundamental core mode and modes in the high-index liquid-filled holes in the fiber cladding, therefore, the fiber can be used for a novel sensing architecture, when cladding holes are selectively filled with temperature sensitive liquids...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28436454/gold-nanoparticle-polymer-nanocomposites-synthesized-by-room-temperature-atmospheric-pressure-plasma-and-their-potential-for-fuel-cell-electrocatalytic-application
#9
Ri-Chao Zhang, Dan Sun, Ruirui Zhang, Wen-Feng Lin, Manuel Macias-Montero, Jenish Patel, Sadegh Askari, Calum McDonald, Davide Mariotti, Paul Maguire
Conductive polymers have been increasingly used as fuel cell catalyst support due to their electrical conductivity, large surface areas and stability. The incorporation of metal nanoparticles into a polymer matrix can effectively increase the specific surface area of these materials and hence improve the catalytic efficiency. In this work, a nanoparticle loaded conductive polymer nanocomposite was obtained by a one-step synthesis approach based on room temperature direct current plasma-liquid interaction. Gold nanoparticles were directly synthesized from HAuCl4 precursor in poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28436257/brain-temperature-but-not-core-temperature-increases-during-spreading-depolarizations-in-patients-with-spontaneous-intracerebral-hemorrhage
#10
Alois J Schiefecker, Mario Kofler, Max Gaasch, Ronny Beer, Iris Unterberger, Bettina Pfausler, Gregor Broessner, Peter Lackner, Paul Rhomberg, Elke Gizewski, Werner O Hackl, Miriam Mulino, Martin Ortler, Claudius Thome, Erich Schmutzhard, Raimund Helbok
Spreading depolarizations (SDs) are highly active metabolic events, commonly occur in patients with intracerebral hemorrhage (ICH) and may be triggered by fever. We investigated the dynamics of brain-temperature (Tbrain) and core-temperature (Tcore) relative to the occurrence of SDs. Twenty consecutive comatose ICH patients with multimodal electrocorticograpy (ECoG) and Tbrain monitoring of the perihematomal area were prospectively enrolled. Clusters of SDs were defined as ≥2 SDs/h. Generalized estimating equations were used for statistical calculations...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28435780/highly-active-and-stable-pt-pd-alloy-catalysts-synthesized-by-room-temperature-electron-reduction-for-oxygen-reduction-reaction
#11
Wei Wang, Zongyuan Wang, Jiajun Wang, Chuan-Jian Zhong, Chang-Jun Liu
Carbon-supported platinum (Pt) and palladium (Pd) alloy catalyst has become a promising alternative electrocatalyst for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. In this work, the synthesis of highly active and stable carbon-supported Pt-Pd alloy catalysts is reported with a room-temperature electron reduction method. The alloy nanoparticles thus prepared show a particle size around 2.6 nm and a core-shell structure with Pt as the shell. With this structure, the breaking of O-O bands and desorption of OH are both promoted in electrocatalysis of ORR...
April 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28435739/crystal-structure-of-cu-tmpen-bf4-2-tmpen-is-n-n-n-n-tetra-kis-6-methyl-pyridin-2-yl-meth-yl-ethane-1-2-di-amine
#12
Lin Chen, Yakun Guo, Gan Ren, Ge Sang
The mononuclear copper title complex {N,N,N',N'-tetra-kis-[(6-methyl-pyridin-2-yl)meth-yl]ethane-1,2-di-amine-κ(6)N}copper(II) bis-(tetra-fluorido-borate), [Cu(C30H36N6)](BF4)2, is conveniently prepared from the reaction of Cu(BF4)2·6H2O with N,N,N',N'-tetra-kis-[(6-methyl-pyridin-2-yl)meth-yl]ethane-1,2-di-amine (tmpen) in aceto-nitrile at room temperature in air. The complex shows a distorted octa-hedral environment around the Cu(II) cation (site symmetry 2) and adopts the centrosymmetric space group C2/c...
April 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28435222/effects-of-intrathecal-dexmedetomidine-on-shivering-after-spinal-anesthesia-for-cesarean-section-a-double-blind-randomized-clinical-trial
#13
Karim Nasseri, Negin Ghadami, Bijan Nouri
BACKGROUND: Shivering is among the common troublesome complications of spinal anesthesia (SA), and causes discomfort and discontentment in parturients undergoing cesarean sections (CSs). The aim of this study was to investigate the effects of intrathecal dexmedetomidine in the prevention of shivering in those who underwent CS under SA. SUBJECTS AND METHODS: Fifty parturients planned for elective CSs under SA were enrolled in this prospective, double-blinded, controlled study and randomly divided into two equal groups...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28430448/structural-and-rheological-properties-of-temperature-responsive-amphiphilic-triblock-copolymers-in-aqueous-media
#14
Josefine Eilsø Nielsen, Kaizheng Zhu, Sverre Arne Sande, Lubomír Kováčik, Dušan Cmarko, Kenneth Dahl Knudsen, Bo Nyström
Thermoresponsive amphiphilic biodegradable block copolymers of the type poly(-caprolactone-co-lactide)-poly(ethylene glycol)-poly(-caprolactone-co-lactide) (PCLA-PEGm-PCLA) have great potential for various biomedical applications. In the present study, we have surveyed the effects of PEG-spacer length (m=1000 and 1500), temperature, and polymer concentration on the self-assembling process to form supramolecular structures in aqueous solutions of the PCLA-PEGm-PCLA copolymer. This copolymer has a lower critical solution temperature, and the cloud point depends on both concentration and PEG-length...
April 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28430241/probing-the-germination-kinetics-of-ethanol-treated-bacillus-thuringiensis-spores
#15
Guiwen Wang, Huanjun Chen, Xiaochun Wang, Lixin Peng, Yuan Peng, Yong-Qing Li
Bacillus thuringiensis (Bt) is the most widely used microbial insecticide. To clarify the mechanism of bacterial resistance to ethanol toxicity, the present study investigated the effects of 70% (v/v) ethanol at a moderate temperature (65°C) on Bt spore germination by single-cell Raman spectroscopy and differential interference contrast microscopy. We found that over 80% of Bt spores were inviable after 30 min of treatment. Moreover, ethanol treatment affected spore germination; the time for initiation of rapid calcium dipicolinate (CaDPA) release (i...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28427637/ultrasound-assisted-degradation-of-organic-dyes-over-magnetic-cofe2o4-zns-core-shell-nanocomposite
#16
Saeed Farhadi, Firouzeh Siadatnasab, Alireza Khataee
Magnetic CoFe2O4@ZnS core-shell nanocomposite was successfully synthesized via one-step hydrothermal decomposition of zinc(II) diethanoldithiocarbamate complex over CoFe2O4 nanoparticles at low temperature of 200°C. The obtained nanocomposite was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, UV-Vis spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, magnetic measurements, and Brunauere-Emmette-Teller. The results confirmed the formation of CoFe2O4@ZnS nanocomposite with the average crystallite size of 18nm...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426754/assessing-environmental-attributes-and-effects-of-climate-change-on-sphagnum-peatland-distributions-in-north-america-using-single-and-multi-species-models
#17
Tobi A Oke, Heather A Hager
The fate of Northern peatlands under climate change is important because of their contribution to global carbon (C) storage. Peatlands are maintained via greater plant productivity (especially of Sphagnum species) than decomposition, and the processes involved are strongly mediated by climate. Although some studies predict that warming will relax constraints on decomposition, leading to decreased C sequestration, others predict increases in productivity and thus increases in C sequestration. We explored the lack of congruence between these predictions using single-species and integrated species distribution models as proxies for understanding the environmental correlates of North American Sphagnum peatland occurrence and how projected changes to the environment might influence these peatlands under climate change...
2017: PloS One
https://www.readbyqxmd.com/read/28424950/estimated-work-ability-in-warm-outdoor-environments-depends-on-the-chosen-heat-stress-assessment-metric
#18
Peter Bröde, Dusan Fiala, Bruno Lemke, Tord Kjellstrom
With a view to occupational effects of climate change, we performed a simulation study on the influence of different heat stress assessment metrics on estimated workability (WA) of labour in warm outdoor environments. Whole-day shifts with varying workloads were simulated using as input meteorological records for the hottest month from four cities with prevailing hot (Dallas, New Delhi) or warm-humid conditions (Managua, Osaka), respectively. In addition, we considered the effects of adaptive strategies like shielding against solar radiation and different work-rest schedules assuming an acclimated person wearing light work clothes (0...
April 19, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28421086/association-analysis-of-markers-derived-from-starch-biosynthesis-related-genes-with-starch-physicochemical-properties-in-the-usda-rice-mini-core-collection
#19
Kehu Li, Jinsong Bao, Harold Corke, Mei Sun
Rice eating and cooking quality is largely determined by starch physicochemical properties. The diverse accessions in the USDA rice mini-core collection (URMC) facilitate extensive association analysis of starch physicochemical properties with molecular markers specific to starch biosynthesis related genes. To identify significant trait-marker associations that can be utilized in rice breeding programs for improved starch quality, we conducted two association analyses between 26 molecular markers derived from starch biosynthesis related genes and 18 parameters measured of starch physicochemical properties in two sets of the mini-core accessions successfully grown in two environments in China...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28420550/effect-of-a-moderate-caffeine-dose-on-endurance-cycle-performance-and-thermoregulation-during-prolonged-exercise-in-the-heat
#20
Ross E Beaumont, Lewis J James
OBJECTIVES: This study investigated the influence of a moderate caffeine dose on endurance cycle performance and thermoregulation during prolonged exercise in high ambient temperature. DESIGN: Double-blind cross-over study. METHODS: Eight healthy, recreationally active males (mean±SD; age: 22±1 years; body mass: 71.1±8.5kg; VO2peak: 55.9±5.8mLkg(-1)min(-1); Wmax: 318±37W) completed one VO2peak test, one familiarisation trial and two experimental trials...
March 31, 2017: Journal of Science and Medicine in Sport
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