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https://www.readbyqxmd.com/read/28923974/manipulation-of-ionized-impurity-scattering-for-achieving-high-thermoelectric-performance-in-n-type-mg3sb2-based-materials
#1
Jun Mao, Jing Shuai, Shaowei Song, Yixuan Wu, Rebecca Dally, Jiawei Zhou, Zihang Liu, Jifeng Sun, Qinyong Zhang, Clarina Dela Cruz, Stephen Wilson, Yanzhong Pei, David J Singh, Gang Chen, Ching-Wu Chu, Zhifeng Ren
Achieving higher carrier mobility plays a pivotal role for obtaining potentially high thermoelectric performance. In principle, the carrier mobility is governed by the band structure as well as by the carrier scattering mechanism. Here, we demonstrate that by manipulating the carrier scattering mechanism in n-type Mg3Sb2-based materials, a substantial improvement in carrier mobility, and hence the power factor, can be achieved. In this work, Fe, Co, Hf, and Ta are doped on the Mg site of Mg3.2Sb1.5Bi0.49Te0...
September 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28895395/thermoelectric-properties-of-sns-with-na-doping
#2
Binqiang Zhou, Shuai Li, Wen Li, Juan Li, Xinyue Zhang, Siqi Lin, Zhiwei Chen, Yanzhong Pei
Tin sulfide (SnS), a low-cost compound from the IV-VI semiconductors, has attracted particular attention due to its great potential for large-scale thermoelectric applications. However, pristine SnS shows a low carrier concentration, which leads to a low thermoelectric performance. In this work, sodium is utilized to substitute Sn to increase the hole concentration and consequently improve the thermoelectric power factor. The resultant Hall carrier concentration up to ∼10(19) cm(-3) is the highest concentration reported so far for this compound...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28891969/growth-method-dependent-and-defect-density-oriented-structural-optical-conductive-and-physical-properties-of-solution-grown-zno-nanostructures
#3
Abu Ul Hassan Sarwar Rana, Ji Young Lee, Areej Shahid, Hyun-Seok Kim
It is time for industry to pay a serious heed to the application and quality-dependent research on the most important solution growth methods for ZnO, namely, aqueous chemical growth (ACG) and microwave-assisted growth (MAG) methods. This study proffers a critical analysis on how the defect density and formation behavior of ZnO nanostructures (ZNSs) are growth method-dependent. Both antithetical and facile methods are exploited to control the ZnO defect density and the growth mechanism. In this context, the growth of ZnO nanorods (ZNRs), nanoflowers, and nanotubes (ZNTs) are considered...
September 10, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28877748/a-pilot-clinical-trial-of-recombinant-human-angiotensin-converting-enzyme-2-in-acute-respiratory-distress-syndrome
#4
Akram Khan, Cody Benthin, Brian Zeno, Timothy E Albertson, John Boyd, Jason D Christie, Richard Hall, Germain Poirier, Juan J Ronco, Mark Tidswell, Kelly Hardes, William M Powley, Tracey J Wright, Sarah K Siederer, David A Fairman, David A Lipson, Andrew I Bayliffe, Aili L Lazaar
BACKGROUND: Renin-angiotensin system (RAS) signaling and angiotensin-converting enzyme 2 (ACE2) have been implicated in the pathogenesis of acute respiratory distress syndrome (ARDS). We postulated that repleting ACE2 using GSK2586881, a recombinant form of human angiotensin-converting enzyme 2 (rhACE2), could attenuate acute lung injury. METHODS: We conducted a two-part phase II trial comprising an open-label intrapatient dose escalation and a randomized, double-blind, placebo-controlled phase in ten intensive care units in North America...
September 7, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28871210/disorder-versus-two-transport-lifetimes-in-a-strongly-correlated-electron-liquid
#5
Patrick B Marshall, Honggyu Kim, Susanne Stemmer
We report on angle-dependent measurements of the sheet resistances and Hall coefficients of electron liquids in SmTiO3/SrTiO3/SmTiO3 quantum well structures, which were grown by molecular beam epitaxy on (001) DyScO3. We compare their transport properties with those of similar structures grown on LSAT [(La0.3Sr0.7)(Al0.65Ta0.35)O3]. On DyScO3, planar defects normal to the quantum wells lead to a strong in-plane anisotropy in the transport properties. This allows for quantifying the role of defects in transport...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28833717/incorporating-an-inert-polymer-into-the-interlayer-passivates-surface-defects-in-methylammonium-lead-halide-perovskite-solar-cells
#6
Shiqing Bi, Xuning Zhang, Liang Qin, Rong Wang, Jiyu Zhou, Xuanye Leng, Xiaohui Qiu, Yuan Zhang, Huiqiong Zhou, Zhiyong Tang
The hysteresis effect and instability are important concerns in hybrid perovskite photovoltaic devices that hold great promise in energy conversion applications. In this study, we show that the power conversion efficiency (PCE), hysteresis, and device lifetime can be simultaneously improved for methylammoniumlead halide (CH3 NH3 PbI3-x Clx ) solar cells after incorporating poly(methyl methacrylate) (PMMA) into the PC61 BM electron extraction layer (EEL). By choosing appropriate molecular weights of PMMA, we obtain a 30 % enhancement of PCE along with effectively lowered hysteresis and device degradation, adopting inverted planar device structure...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28810420/the-effects-of-power-and-stretch-yoga-on-affect-and-salivary-cortisol-in-women
#7
Molly Sullivan, Amanda Carberry, Elizabeth S Evans, Eric E Hall, Svetlana Nepocatych
Yoga practice is known to improve well-being and decrease stress. However, acute yoga is understudied. This study investigated the effects of two different types of yoga on affect and salivary cortisol levels in college women. Thirty-three women aged 18-30 years each completed 1-hour sessions of power yoga and stretch yoga. Measures of affect and salivary cortisol were assessed before, during, and after each session. Participants perceived power yoga to be more pleasurable and energizing. Salivary cortisol significantly decreased after both yoga sessions...
February 1, 2017: Journal of Health Psychology
https://www.readbyqxmd.com/read/28804972/mendelian-randomisation-analysis-provides-no-evidence-for-a-relationship-between-adult-height-and-testicular-cancer-risk
#8
M Levy, D Hall, A Sud, P Law, K Litchfield, D Dudakia, T B Haugen, R Karlsson, A Reid, R A Huddart, T Grotmol, F Wiklund, R S Houlston, C Turnbull
Observational studies have suggested anthropometric traits, particularly increased height are associated with an elevated risk of testicular cancer (testicular germ cell tumour). However, there is an inconsistency between study findings, suggesting the possibility of the influence of confounding factors. To examine the association between anthropometric traits and testicular germ cell tumour using an unbiased approach, we performed a Mendelian randomisation study. We used genotype data from genome wide association studies of testicular germ cell tumour totalling 5518 cases and 19,055 controls...
August 13, 2017: Andrology
https://www.readbyqxmd.com/read/28792439/characteristics-of-carrier-transport-and-crystallographic-orientation-distribution-of-transparent-conductive-al-doped-zno-polycrystalline-films-deposited-by-radio-frequency-direct-current-and-radio-frequency-superimposed-direct-current-magnetron-sputtering
#9
Junichi Nomoto, Katsuhiko Inaba, Shintaro Kobayashi, Takeshi Watanabe, Hisao Makino, Tetsuya Yamamoto
We investigated the characteristics of carrier transport and crystallographic orientation distribution in 500-nm-thick Al-doped ZnO (AZO) polycrystalline films to achieve high-Hall-mobility AZO films. The AZO films were deposited on glass substrates at 200 °C by direct-current, radio-frequency, or radio-frequency-superimposed direct-current magnetron sputtering at various power ratios. We used sintered AZO targets with an Al₂O₃ content of 2.0 wt. %. The analysis of the data obtained by X-ray diffraction, Hall-effect, and optical measurements of AZO films at various power ratios showed that the complex orientation texture depending on the growth process enhanced the contribution of grain boundary scattering to carrier transport and of carrier sinks on net carrier concentration, resulting in the reduction in the Hall mobility of polycrystalline AZO films...
August 9, 2017: Materials
https://www.readbyqxmd.com/read/28774272/identification-of-candidate-protective-variants-for-common-diseases-and-evaluation-of-their-protective-potential
#10
Joe M Butler, Neil Hall, Niro Narendran, Yit C Yang, Luminita Paraoan
BACKGROUND: Human polymorphisms with derived alleles that are protective against disease may provide powerful translational opportunities. Here we report a method to identify such candidate polymorphisms and apply it to common non-synonymous SNPs (nsSNPs) associated with common diseases. Our study also sought to establish which of the identified protective nsSNPs show evidence of positive selection, taking this as indirect evidence that the protective variant has a beneficial effect on phenotype...
August 3, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28770935/insights-into-charge-carrier-dynamics-in-organo-metal-halide-perovskites-from-neat-films-to-solar-cells
#11
Jiajun Peng, Yani Chen, Kaibo Zheng, Tõnu Pullerits, Ziqi Liang
Organo-metal halide perovskites have recently obtained world-wide attention as promising solar cell materials. They have broad and strong light absorption along with excellent carrier transport properties which partially explain their record power conversion efficiencies above 22%. However, the basic understanding of the underlying physical mechanisms is still limited and there remain large discrepancies among reported transport characteristics of perovskite materials. Notably, the carrier mobility of perovskite samples either in thin films or within solar cells obtained using different techniques can vary by up to 7-8 orders of magnitude...
August 3, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28768861/positive-and-negative-regulation-of-type-i-interferons-by-the-human-t-cell-leukemia-virus-antisense-protein-hbz
#12
Manraj Singh Narulla, Ahlam Alsairi, Lucie Charmier, Stephen Noonan, David Conroy, William W Hall, Noreen Sheehy
The pathogenesis of human T-cell leukemia virus type 1 (HTLV-1) is strongly linked to the viral regulatory proteins Tax1 and HBZ, whose opposing functions contribute to the clinical outcome of infection. Type I interferons α and β (IFNα and IFNβ) are key cytokines involved in innate immunity and IFNα, in combination with other antivirals, is extensively used in the treatment of HTLV-1 infection. The relationship between HTLV-1 and IFN signaling is unclear and to date the effect of HBZ on this pathway has not been examined...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28764519/stabilizing-low-frequency-oscillation-with-two-stage-filter-in-hall-thrusters
#13
Liqiu Wei, Liang Han, Yongjie Ding, Daren Yu, Chaohai Zhang
The use of a filter is the most common method to suppress low-frequency discharge current oscillation in Hall thrusters. The only form of filter in actual use involves RLC networks, which serve the purpose of reducing the level of conducted electromagnetic interference returning to the power processing unit, which is the function of a filter. Recently, the role of the filter in the oscillation control was introduced. It has been noted that the filter regulates the voltage across itself according to the variation of discharge current so as to decrease its fluctuation in the discharge circuit, which is the function of a controller...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28759200/control-of-elemental-distribution-in-the-nanoscale-solid-state-reaction-that-produces-ga1-xznx-n1-xox-nanocrystals
#14
Pornthip Tongying, Ying-Gang Lu, Leah M G Hall, Kyureon Lee, Marta Sulima, Jim Ciston, Gordana Dukovic
Solid-state chemical transformations at the nanoscale can be a powerful tool for achieving compositional complexity in nanomaterials. It is desirable to understand the mechanisms of such reactions and characterize the local-level composition of the resulting materials. Here, we examine how reaction temperature controls the elemental distribution in (Ga1-xZnx)(N1-xOx) nanocrystals (NCs) synthesized via the solid-state nitridation of a mixture of nanoscale ZnO and ZnGa2O4 NCs. (Ga1-xZnx)(N1-xOx) is a visible-light absorbing semiconductor that is of interest for applications in solar photochemistry...
August 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28751639/high-performance-nanoscale-topological-energy-transduction
#15
Timothy M Philip, Matthew J Gilbert
The realization of high-performance, small-footprint, on-chip inductors remains a challenge in radio-frequency and power microelectronics, where they perform vital energy transduction in filters and power converters. Modern planar inductors consist of metallic spirals that consume significant chip area, resulting in low inductance densities. We present a novel method for magnetic energy transduction that utilizes ferromagnetic islands (FIs) on the surface of a 3D time-reversal-invariant topological insulator (TI) to produce paradigmatically different inductors...
July 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28696753/evolution-of-the-reactor-antineutrino-flux-and-spectrum-at-daya-bay
#16
F P An, A B Balantekin, H R Band, M Bishai, S Blyth, D Cao, G F Cao, J Cao, Y L Chan, J F Chang, Y Chang, H S Chen, Q Y Chen, S M Chen, Y X Chen, Y Chen, J Cheng, Z K Cheng, J J Cherwinka, M C Chu, A Chukanov, J P Cummings, Y Y Ding, M V Diwan, M Dolgareva, J Dove, D A Dwyer, W R Edwards, R Gill, M Gonchar, G H Gong, H Gong, M Grassi, W Q Gu, L Guo, X H Guo, Y H Guo, Z Guo, R W Hackenburg, S Hans, M He, K M Heeger, Y K Heng, A Higuera, Y B Hsiung, B Z Hu, T Hu, E C Huang, H X Huang, X T Huang, Y B Huang, P Huber, W Huo, G Hussain, D E Jaffe, K L Jen, X P Ji, X L Ji, J B Jiao, R A Johnson, D Jones, L Kang, S H Kettell, A Khan, S Kohn, M Kramer, K K Kwan, M W Kwok, T J Langford, K Lau, L Lebanowski, J Lee, J H C Lee, R T Lei, R Leitner, J K C Leung, C Li, D J Li, F Li, G S Li, Q J Li, S Li, S C Li, W D Li, X N Li, X Q Li, Y F Li, Z B Li, H Liang, C J Lin, G L Lin, S Lin, S K Lin, Y-C Lin, J J Ling, J M Link, L Littenberg, B R Littlejohn, J L Liu, J C Liu, C W Loh, C Lu, H Q Lu, J S Lu, K B Luk, X Y Ma, X B Ma, Y Q Ma, Y Malyshkin, D A Martinez Caicedo, K T McDonald, R D McKeown, I Mitchell, Y Nakajima, J Napolitano, D Naumov, E Naumova, H Y Ngai, J P Ochoa-Ricoux, A Olshevskiy, H-R Pan, J Park, S Patton, V Pec, J C Peng, L Pinsky, C S J Pun, F Z Qi, M Qi, X Qian, R M Qiu, N Raper, J Ren, R Rosero, B Roskovec, X C Ruan, H Steiner, P Stoler, J L Sun, W Tang, D Taychenachev, K Treskov, K V Tsang, C E Tull, N Viaux, B Viren, V Vorobel, C H Wang, M Wang, N Y Wang, R G Wang, W Wang, X Wang, Y F Wang, Z Wang, Z Wang, Z M Wang, H Y Wei, L J Wen, K Whisnant, C G White, L Whitehead, T Wise, H L H Wong, S C F Wong, E Worcester, C-H Wu, Q Wu, W J Wu, D M Xia, J K Xia, Z Z Xing, J L Xu, Y Xu, T Xue, C G Yang, H Yang, L Yang, M S Yang, M T Yang, Y Z Yang, M Ye, Z Ye, M Yeh, B L Young, Z Y Yu, S Zeng, L Zhan, C Zhang, C C Zhang, H H Zhang, J W Zhang, Q M Zhang, R Zhang, X T Zhang, Y M Zhang, Y X Zhang, Y M Zhang, Z J Zhang, Z Y Zhang, Z P Zhang, J Zhao, L Zhou, H L Zhuang, J H Zou
The Daya Bay experiment has observed correlations between reactor core fuel evolution and changes in the reactor antineutrino flux and energy spectrum. Four antineutrino detectors in two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple fuel cycles for each of six 2.9 GW_{th} reactor cores at the Daya Bay and Ling Ao nuclear power plants. Using detector data spanning effective ^{239}Pu fission fractions F_{239} from 0.25 to 0.35, Daya Bay measures an average IBD yield σ[over ¯]_{f} of (5...
June 23, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28671183/microwave-free-nuclear-magnetic-resonance-at-molecular-scales
#17
James D A Wood, Jean-Philippe Tetienne, David A Broadway, Liam T Hall, David A Simpson, Alastair Stacey, Lloyd C L Hollenberg
The implementation of nuclear magnetic resonance (NMR) at the nanoscale is a major challenge, as the resolution of conventional methods is limited to mesoscopic scales. Approaches based on quantum spin probes, such as the nitrogen-vacancy (NV) centre in diamond, have achieved nano-NMR under ambient conditions. However, the measurement protocols require application of complex microwave pulse sequences of high precision and relatively high power, placing limitations on the design and scalability of these techniques...
July 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/28670784/gene-environment-interactions-involving-functional-variants-results-from-the-breast-cancer-association-consortium
#18
Myrto Barrdahl, Anja Rudolph, John L Hopper, Melissa C Southey, Annegien Broeks, Peter A Fasching, Matthias W Beckmann, Manuela Gago-Dominguez, J Esteban Castelao, Pascal Guénel, Thérèse Truong, Stig E Bojesen, Susan M Gapstur, Mia M Gaudet, Hermann Brenner, Volker Arndt, Hiltrud Brauch, Ute Hamann, Arto Mannermaa, Diether Lambrechts, Lynn Jongen, Dieter Flesch-Janys, Kathrin Thoene, Fergus J Couch, Graham G Giles, Jacques Simard, Mark S Goldberg, Jonine Figueroa, Kyriaki Michailidou, Manjeet K Bolla, Joe Dennis, Qin Wang, Ursula Eilber, Sabine Behrens, Kamila Czene, Per Hall, Angela Cox, Simon Cross, Anthony Swerdlow, Minouk J Schoemaker, Alison M Dunning, Rudolf Kaaks, Paul D P Pharoah, Marjanka Schmidt, Montserrat Garcia-Closas, Douglas F Easton, Roger L Milne, Jenny Chang-Claude
Investigating the most likely causal variants identified by fine-mapping analyses may improve the power to detect gene-environment interactions. We assessed the interplay between 70 single nucleotide polymorphisms identified by genetic fine-scale mapping of susceptibility loci and 11 epidemiological breast cancer risk factors in relation to breast cancer. Analyses were conducted on up to 58,573 subjects (26,968 cases and 31,605 controls) from the Breast Cancer Association Consortium, in one of the largest studies of its kind...
July 3, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28663385/re-examining-the-role-of-cdc14-phosphatase-in-reversal-of-cdk-phosphorylation-during-mitotic-exit
#19
Brendan L Powers, Mark C Hall
Inactivation of cyclin-dependent kinase (Cdk) and reversal of Cdk phosphorylation are universally required for mitotic exit. In budding yeast (Saccharomyces cerevisiae), Cdc14 is essential for both and thought to be the major Cdk-counteracting phosphatase. However, Cdc14 is not required for mitotic exit in many eukaryotes, despite highly conserved biochemical properties. The question of how similar enzymes could have such disparate influences on mitotic exit prompted us to re-examine the contribution of budding yeast Cdc14...
August 15, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28661082/centre-level-variation-of-treatment-and-outcome-in-5-year-old-children-with-non-syndromic-unilateral-cleft-lip-and-palate-the-cleft-care-uk-study-part-1-methodology-and%C3%A2-results-for-dento-facial-outcomes
#20
A K Wills, O Mahmoud, A Hall, D Sell, J Smallridge, L Southby, S Toms, A Waylen, Y Wren, A R Ness, J R Sandy
OBJECTIVES: Outline methods used to describe centre-level variation in treatment and outcome in children in the Cleft Care UK (CCUK) study. Report centre-level variation in dento-facial outcomes. SETTING AND SAMPLE POPULATION: Two hundred and sixty-eight five-year-old British children with non-syndromic unilateral cleft lip and palate (UCLP). MATERIALS AND METHODS: Between January 2011 and December 2012, data were collected on a comprehensive range of outcomes...
June 2017: Orthodontics & Craniofacial Research
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