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https://www.readbyqxmd.com/read/29777195/b-periodic-oscillations-in-the-hall-resistance-induced-by-a-dc-current-bias-under-combined-microwave-excitation-and-dc-current-bias-in-the-gaas-algaas-2d-system
#1
Han-Chun Liu, C Reichl, W Wegscheider, R G Mani
We report the observation of dc-current-bias-induced B-periodic Hall resistance oscillations and Hall plateaus in the GaAs/AlGaAs 2D system under combined microwave radiation- and dc bias excitation at liquid helium temperatures. The Hall resistance oscillations and plateaus appear together with concomitant oscillations also in the diagonal magnetoresistance. The periods of Hall and diagonal resistance oscillations are nearly identical, and source power (P) dependent measurements demonstrate sub-linear relationship of the oscillation amplitude with P over the span 0 < P ≤ 20 mW...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29716323/a-highly-integrated-single-mode-1064-nm-laser-with-8-5-khz-linewidth-for-dual-wavelength-active-optical-clock
#2
Tiantian Shi, Duo Pan, Pengyuan Chang, Haosen Shang, Jingbiao Chen
Without exploiting any frequency selective elements, we have realized a highly integrated, single-mode, narrow-linewidth Nd:YAG 1064 nm laser, which is end-pumped by the 808.6 nm diode laser in an integrated invar cavity. It turns out that each 1064 nm laser achieves a most probable linewidth of 8.5 kHz by beating between two identical laser systems. The output power of the 1064 nm laser increases steadily as the 808.6 nm pump power is raised, which can be up to 350 mW. Moreover, the resonant wavelength of cavity grows continuously in a certain crystal temperature range...
April 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29677777/a-study-on-the-formation-of-2-dimensional-tungsten-disulfide-thin-films-on-sapphire-substrate-by-sputtering-and-high-temperature-rapid-thermal-processing
#3
Hanyeob Nam, Hong-Seok Kim, Jae-Hee Han, Sang Jik Kwon, Eou Sik Cho
As direct formation of p-type two-dimensional transition metal dichalcogenides (TMDC) films on substrates, tungsten disulfide (WS2) thin films were deposited onto sapphire glass substrate through shadow mask patterns by radio-frequency (RF) sputtering at different sputtering powers ranging from 60 W to 150 W and annealed by rapid thermal processing (RTP) at various high temperatures ranging from 500 °C to 800 °C. Based on scanning electron microscope (SEM) images and Raman spectra, better surface roughness and mode dominant E12g and A1g peaks were found for WS2 thin films prepared at higher RF sputtering powers...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29667243/a-biopolymer-heparin-sodium-interlayer-anchoring-tio-2-and-mapbi-3-enhances-trap-passivation-and-device-stability-in-perovskite-solar-cells
#4
Shuai You, Hui Wang, Shiqing Bi, Jiyu Zhou, Liang Qin, Xiaohui Qiu, Zhiqiang Zhao, Yun Xu, Yuan Zhang, Xinghua Shi, Huiqiong Zhou, Zhiyong Tang
Traps in the photoactive layer or interface can critically influence photovoltaic device characteristics and stabilities. Here, traps passivation and retardation on device degradation for methylammonium lead trihalide (MAPbI3 ) perovskite solar cells enabled by a biopolymer heparin sodium (HS) interfacial layer is investigated. The incorporated HS boosts the power conversion efficiency from 17.2 to 20.1% with suppressed hysteresis and Shockley-Read-Hall recombination, which originates primarily from the passivation of traps near the interface between the perovskites and the TiO2 cathode...
April 18, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29663009/exploring-time-resolved-photoluminescence-for-nanowires-using-a-three-dimensional-computational-transient-model
#5
Dingkun Ren, Adam C Scofield, Alan C Farrell, Zixuan Rong, Michael A Haddad, Ramesh B Laghumavarapu, Baolai Liang, Diana L Huffaker
Time-resolved photoluminescence (TRPL) has been implemented experimentally to measure the carrier lifetime of semiconductors for decades. For the characterization of nanowires, the rich information embedded in TRPL curves has not been fully interpreted and meaningfully mapped to the respective material properties. This is because their three-dimensional (3-D) geometries result in more complicated mechanisms of carrier recombination than those in thin films and analytical solutions cannot be found for those nanostructures...
April 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29661482/anisotropy-and-spatial-heterogeneity-in-quantitative-ultrasound-parameters-relevance-to-the-study-of-the-human-cervix
#6
Quinton W Guerrero, Helen Feltovich, Ivan M Rosado-Mendez, Lindsey C Carlson, Geng Li, Timothy J Hall
Imaging biomarkers based on quantitative ultrasound can offer valuable information about properties that inform tissue function and behavior such as microstructural organization (e.g., collagen alignment) and viscoelasticity (i.e., compliance). For example, the cervix feels softer as its microstructure remodels during pregnancy, an increase in compliance that can be objectively quantified with shear wave speed and therefore shear wave speed estimation is a potential biomarker of cervical remodeling. Other proposed biomarkers include parameters derived from the backscattered echo signal, such as attenuation and backscattered power loss, because such parameters can provide insight into tissue microstructural alignment and organization...
April 13, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29659347/social-justice-at-the-core-of-breastfeeding-protection-promotion-and-support-a-conceptualization
#7
Paige Hall Smith
Despite widespread awareness of the health benefits for both mothers and babies we are far from achieving universal breastfeeding. Breastfeeding rates globally are lower than recommended levels and there are concerns that some global breastfeeding efforts have stalled (1, 2). In addition, we see persistent disparities in breastfeeding rates by race, ethnicity, class and status (3). A growing literature documents how a range of injustices, including gender inequality (7), racism (8), poverty (9), and violence (10, 11) shape whether, how exclusive, and for how long mothers and others will be able to breastfeed or feed their infants human milk...
May 2018: Journal of Human Lactation: Official Journal of International Lactation Consultant Association
https://www.readbyqxmd.com/read/29652694/perspectives-for-progress-performance-limitations-in-heart-transplant-recipients
#8
Wesley J Tucker, Rhys I Beaudry, T Jake Samuel, Michael D Nelson, Martin Halle, Aaron L Baggish, Mark J Haykowsky
We hypothesize that the reduced peak aerobic power (peak VO2) following heart transplantation (HT) is due to impaired cardiovascular and skeletal muscle function, and its improvement with short-term (≤1 year) exercise training is primarily due to favorable skeletal muscle adaptations. Further, the increased peak VO2 with long-term (>2 years) training is primarily mediated by cardiac (sympathetic) reinnervation.
April 12, 2018: Exercise and Sport Sciences Reviews
https://www.readbyqxmd.com/read/29651996/superconductivity-switch-from-spin-singlet-to-triplet-pairing-in-a-topological-superconducting-junction
#9
Ze Tao, Fu Jun Chen, Lin Yi Zhou, Bin Li, Yong Chun Tao, Jun Wang
The interedge coupling is the cardinal characteristic of the narrow quantum spin Hall (QSH) insulator, and thus could bring about exotic transport phenomena. Herein, we present a theoretical investigation of the spin-resolved Andreev reflection (AR) in a QSH insulator strip touching on two neighbouring ferromgnetic insulators and one s-wave superconductor. It is demonstrated that, due&#13; to the interplay of the interedge coupling and ferromagnetic configuration, there could be not only usual local ARs leading to spin-singlet pairing with the incident electron and Andreev-reflected hole from different spin subbands, but also novel local ARs giving rise to triplet pairing with the same spin...
April 13, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29621189/nanoscale-origins-of-the-size-effect-in-the-compression-response-of-single-crystal-ni-base-superalloy-micro-pillars
#10
Siqi Ying, Lifeng Ma, Tan Sui, Chrysanthi Papadaki, Enrico Salvati, Leon Romano Brandt, Hongjia Zhang, Alexander M Korsunsky
Nickel superalloys play a pivotal role in enabling power-generation devices on land, sea, and in the air. They derive their strength from coherent cuboidal precipitates of the ordered γ' phase that is different from the γ matrix in composition, structure and properties. In order to reveal the correlation between elemental distribution, dislocation glide and the plastic deformation of micro- and nano-sized volumes of a nickel superalloy, a combined in situ nanoindentation compression study was carried out with a scanning electron microscope (SEM) on micro- and nano-pillars fabricated by focused ion beam (FIB) milling of Ni-base superalloy CMSX4...
April 5, 2018: Materials
https://www.readbyqxmd.com/read/29615134/improving-outcomes-after-pediatric-cardiac-arrest-the-icu-resuscitation-project-study-protocol-for-a-randomized-controlled-trial
#11
Ron W Reeder, Alan Girling, Heather Wolfe, Richard Holubkov, Robert A Berg, Maryam Y Naim, Kathleen L Meert, Bradley Tilford, Joseph A Carcillo, Melinda Hamilton, Matthew Bochkoris, Mark Hall, Tensing Maa, Andrew R Yates, Anil Sapru, Robert Kelly, Myke Federman, J Michael Dean, Patrick S McQuillen, Deborah Franzon, Murray M Pollack, Ashley Siems, John Diddle, David L Wessel, Peter M Mourani, Carleen Zebuhr, Robert Bishop, Stuart Friess, Candice Burns, Shirley Viteri, David A Hehir, R Whitney Coleman, Tammara L Jenkins, Daniel A Notterman, Robert F Tamburro, Robert M Sutton
BACKGROUND: Quality of cardiopulmonary resuscitation (CPR) is associated with survival, but recommended guidelines are often not met, and less than half the children with an in-hospital arrest will survive to discharge. A single-center before-and-after study demonstrated that outcomes may be improved with a novel training program in which all pediatric intensive care unit staff are encouraged to participate in frequent CPR refresher training and regular, structured resuscitation debriefings focused on patient-centric physiology...
April 3, 2018: Trials
https://www.readbyqxmd.com/read/29611340/the-targeted-anti-oxidant-mitoq-causes-mitochondrial-swelling-and-depolarization-in-kidney-tissue
#12
Esther M Gottwald, Michael Duss, Milica Bugarski, Dominik Haenni, Claus D Schuh, Ehud M Landau, Andrew M Hall
Kidney proximal tubules (PTs) contain a high density of mitochondria, which are required to generate ATP to power solute transport. Mitochondrial dysfunction is implicated in the pathogenesis of numerous kidney diseases. Damaged mitochondria are thought to produce excess reactive oxygen species (ROS), which can lead to oxidative stress and activation of cell death pathways. MitoQ is a mitochondrial targeted anti-oxidant that has shown promise in preclinical models of renal diseases. However, recent studies in nonkidney cells have suggested that MitoQ might also have adverse effects...
April 2018: Physiological Reports
https://www.readbyqxmd.com/read/29601547/impact-of-interstitial-ni-on-the-thermoelectric-properties-of-the-half-heusler-tinisn
#13
Sonia A Barczak, Jim Buckman, Ronald I Smith, Annabelle R Baker, Eric Don, Ian Forbes, Jan-Willem G Bos
TiNiSn is an intensively studied half-Heusler alloy that shows great potential for waste heat recovery. Here, we report on the structures and thermoelectric properties of a series of metal-rich TiNi1+y Sn compositions prepared via solid-state reactions and hot pressing. A general relation between the amount of interstitial Ni and lattice parameter is determined from neutron powder diffraction. High-resolution synchrotron X-ray powder diffraction reveals the occurrence of strain broadening upon hot pressing, which is attributed to the metastable arrangement of interstitial Ni...
March 30, 2018: Materials
https://www.readbyqxmd.com/read/29599425/two-component-anomalous-hall-effect-in-a-magnetically-doped-topological-insulator
#14
Nan Liu, Jing Teng, Yongqing Li
The anomalous Hall (AH) effect measurement has emerged as a powerful tool to gain deep insights into magnetic materials, such as ferromagnetic metals, magnetic semiconductors, and magnetic topological insulators (TIs). In Mn-doped Bi2 Se3 , however, the AH effect has never been reported despite a lot of previous studies. Here we report the observation of AH effect in (Bi,Mn)2 Se3 thin films and show that the sign of AH resistances changes from positive to negative as the Mn concentration is increased. The positive and negative AH resistances are found to coexist in a crossover regime...
March 29, 2018: Nature Communications
https://www.readbyqxmd.com/read/29587153/two-dimensional-1-h-and-1-h-detected-nmr-study-of-a-heterogeneous-biocatalyst-using-fast-mas-at-high-magnetic-fields
#15
Sabu Varghese, Peter J Halling, Daniel Häussinger, Stephen Wimperis
Nuclear magnetic resonance (NMR) is a powerful tool for investigating atomic-scale structure in heterogeneous or composite materials where long-range order is absent. In this work solid-state1 H and1 H-detected NMR experiments were performed with fast magic angle spinning (νR  = 75 kHz) and at high magnetic fields (B0  = 20 T) and used to gain structural insight into a heterogeneous biocatalyst consisting of an enzyme, human carbonic anhydrase II (hCA II), covalently immobilized on epoxy-functionalized silica...
March 14, 2018: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/29577008/improved-performance-of-ionic-liquid-supercapacitors-by-using-tetracyanoborate-anions
#16
Vitor L Martins, Anthony J R Rennie, Nedher Sanchez-Ramirez, Roberto M Torresi, Peter J Hall
Supercapacitors are energy storage devices designed to operate at higher power densities than conventional batteries, but their energy density is still too low for many applications. Efforts are made to design new electrolytes with wider electrochemical windows than aqueous or conventional organic electrolytes in order to increase energy density. Ionic liquids (ILs) with wide electrochemical stability windows are excellent candidates to be employed as supercapacitor electrolytes. ILs containing tetracyanoborate anions [B(CN)4 ] offer wider electrochemical stability than conventional electrolytes and maintain a high ionic conductivity (6...
February 2018: ChemElectroChem
https://www.readbyqxmd.com/read/29559807/bold-magnetic-resonance-imaging-in-nephrology
#17
REVIEW
Michael E Hall, Jennifer H Jordan, Luis A Juncos, W Gregory Hundley, John E Hall
Magnetic resonance (MR) imaging, a non-invasive modality that provides anatomic and physiologic information, is increasingly used for diagnosis of pathophysiologic conditions and for understanding renal physiology in humans. Although functional MR imaging methods were pioneered to investigate the brain, they also offer powerful techniques for investigation of other organ systems such as the kidneys. However, imaging the kidneys provides unique challenges due to potential complications from contrast agents. Therefore, development of non-contrast techniques to study kidney anatomy and physiology is important...
2018: International Journal of Nephrology and Renovascular Disease
https://www.readbyqxmd.com/read/29548187/helical-thermoelectrics-and-refrigeration
#18
Arjun Mani, Colin Benjamin
The thermoelectric properties of a three-terminal quantum spin Hall (QSH) sample are examined. The inherent helicity of the QSH sample helps to generate a large charge power efficiently. Along with charge the system can be designed to work as a highly efficient spin heat engine too. The advantage of a helical over a chiral sample is that, while a multiterminal quantum Hall sample can only work as a quantum heat engine due to broken time reversal (TR) symmetry, a multiterminal QSH system can work effectively as both a charge or spin heat engine and as a charge or spin refrigerator as the TR symmetry is preserved...
February 2018: Physical Review. E
https://www.readbyqxmd.com/read/29547317/magnon-valve-effect-between-two-magnetic-insulators
#19
H Wu, L Huang, C Fang, B S Yang, C H Wan, G Q Yu, J F Feng, H X Wei, X F Han
The key physics of the spin valve involves spin-polarized conduction electrons propagating between two magnetic layers such that the device conductance is controlled by the relative magnetization orientation of two magnetic layers. Here, we report the effect of a magnon valve which is made of two ferromagnetic insulators (YIG) separated by a nonmagnetic spacer layer (Au). When a thermal gradient is applied perpendicular to the layers, the inverse spin Hall voltage output detected by a Pt bar placed on top of the magnon valve depends on the relative orientation of the magnetization of two YIG layers, indicating the magnon current induced by the spin Seebeck effect at one layer affects the magnon current in the other layer separated by Au...
March 2, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29537002/synthesis-and-transport-properties-of-the-te-substituted-homologous-compounds-pb-5-bi-6-se-14-x-te-x-0-%C3%A2-x-%C3%A2-1-0
#20
Selma Sassi, Christophe Candolfi, Christine Gendarme, Anne Dauscher, Bertrand Lenoir
The crystal structure and transport properties (2-723 K) of the homologous compound Pb5 Bi6 Se14 with partial substitution of Te for Se are studied by means of powder X-ray diffraction, scanning electron microscopy, electrical resistivity, thermopower, thermal conductivity and Hall effect measurements. Polycrystalline samples of Pb5 Bi6 Se14-x Tex (0 ≤ x ≤ 1.0) were prepared by a two-step synthesis method based on the pseudo-binary PbSe-Bi2 Se3 phase diagram combined with Te substitution in the PbSe precursor...
March 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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