keyword
MENU ▼
Read by QxMD icon Read
search

Bi polar

keyword
https://www.readbyqxmd.com/read/28207241/zero-thermal-expansion-and-semiconducting-properties-in-pbtio3-bi-co-ti-o3-ferroelectric-solid-solutions
#1
Zhao Pan, Jun Chen, Xingxing Jiang, Zheshuai Lin, Linxing Zhang, Longlong Fan, Yangchun Rong, Lei Hu, Hui Liu, Yang Ren, Xiaojun Kuang, Xianran Xing
Zero thermal expansion (ZTE) behavior is rare but important for both fundamental studies and practical applications of functional materials. Until now, most available ZTE materials are either electrical insulating oxides or conductive metallic compounds. Very few ZTE materials exhibit the semiconductor feature. Here we report a ZTE in a semiconducting ferroelectric of 0.6PbTiO3-0.4Bi(Co0.55Ti0.45)O3-δ. Its unit cell volume exhibits a negligible change over a broad temperature range from room temperature to 500 °C...
February 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28188690/interconnected-network-of-shell-core-co-bi-pi-cop-for-efficient-water-oxidation-electrocatalysis-under-near-neutral-conditions
#2
Xuping Sun
Developing earth-abundant electrocatalysts for efficient and stable water oxidation under near neutral conditions is of great importance but still remains a key challenge. In this Communication, we demonstrate the development of an interconnected network of shell-core Co-Bi-Pi@CoP via anodic polarization of CoP nanoarray in potassium borate aqueous electrolyte (KBi). This 3D Co-Bi-Pi@CoP exhibits super high catalytic activity for water oxidation at pH 9.2 and needs overpotential of only 410 mV to drive a geometrical catalytic current density of 10 mA cm-2, with a high turnover frequency of 819 h-1 at overpotential of 610 mV...
February 11, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28182398/new-method-to-determine-the-schottky-barrier-in-few-layer-black-phosphorus-metal-contacts
#3
Su Yeong Lee, Won Seok Yun, J D Lee
Schottky barrier height and carrier polarity are seminal concepts for a practical device application of the interface between semiconductor and metal electrode. Investigation of those concepts is usually made by a conventional method such as the Schottky-Mott rule, incorporating the metal work function and semiconductor electron affinity, or the Fermi level pinning effect, resulting from the metal-induced gap states. Both manners are, however, basically applied to the bulk semiconductor metal contacts. To explore few-layer black phosphorus metal contacts far from the realm of bulk, we propose a new method to determine the Schottky barrier by scrutinizing the layer-by-layer phosphorus electronic structure from the first-principles calculation combined with the state-of-the-art band unfolding technique...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28177589/the-evolution-of-amniote-gastrulation-the-blastopore-primitive-streak-transition
#4
REVIEW
Matthew J Stower, Federica Bertocchini
In the animal kingdom, gastrulation, the process by which the primary germ layers are formed involves a dramatic transformation in the topology of the cells that give rise to all of the tissues of the adult. Initially formed as a mono-layer, this tissue, the epiblast, becomes subdivided through the internalization of cells, thereby forming a two (bi-laminar) or three (tri-laminar) layered embryo. This morphogenetic process coordinates the development of the fundamental body plan and the three-body axes (antero-posterior, dorso-ventral, and left-right) and begins a fundamental segregation of cells toward divergent developmental fates...
February 8, 2017: Wiley Interdisciplinary Reviews. Developmental Biology
https://www.readbyqxmd.com/read/28159455/application-of-1-h-and-27-al-magic-angle-spinning-solid-state-nmr-at-60khz-for-studies-of-au-and-au-ni-catalysts-supported-on-boehmite-alumina
#5
Piotr Paluch, Natalia Potrzebowska, Agnieszka M Ruppert, Marek J Potrzebowski
In this work for the first time we show the power of solid state NMR spectroscopy in structural analysis of alumina and catalysts supported on the alumina surface employing very fast (60kHz) magic angle spinning (MAS) technique. In the methodological part we demonstrate that under such MAS condition, cross-polarization (CP) from proton to aluminum is an efficient process when a very weak (27)Al RF field is applied. The mechanism of CP transfer and the Hartmann-Hahn (H-H) matching conditions were tested for (27)Al RF fields equal to 3...
January 26, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/28152425/stimulation-of-the-medial-septum-improves-performance-in-spatial-learning-following-pilocarpine-induced-status-epilepticus
#6
Darrin J Lee, Ali Izadi, Mikhail Melnik, Stacey Seidl, Angela Echeverri, Kiarash Shahlaie, Gene G Gurkoff
Temporal lobe epilepsy often leads to hippocampal sclerosis and persistent cognitive deficits, including difficulty with learning and memory. Hippocampal theta oscillations are critical in optimizing hippocampal function and facilitating plasticity. We hypothesized that pilocarpine-induced status epilepticus would disrupt oscillations and behavioral performance and that electrical neuromodulation to entrain theta would improve cognition specifically in injured rats. Rats received a pilocarpine (n=30) or saline injection (n=27) and unilateral bi-polar electrodes were implanted into the medial septum and hippocampus the following day...
January 17, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28145092/dual-heteroatom-doped-carbon-nanofoam-wrapped-iron-monosulfide-nanoparticles-an-efficient-cathode-catalyst-for-li-o2-batteries
#7
Prakash Ramakrishnan, Sangaraju Shanmugam, Jae Hyun Kim
A cost-effective dual heteroatoms doped three-dimensional carbon nanofoam wrapped iron mono-sulfide (FeS) nanoparticles (nps), FeS-C acts as an efficient bi-functional catalyst for Lithium oxygen (Li-O2) battery application. The Li-O2 battery study shows this cathode exhibits a maximum deep discharge capacity of 14,777.5 mAhg-1 with a 98.1% columbic efficiency at 0.1 mAcm-2. The controlled capacity (500 mAhg-1) test of this cathode delivers a minimum polarization gap of 0.73 V at 0.1 mAcm-2 and also sustains for 100 cycles with the energy efficiency of ~64 % (1st cycle) and ~52% (100th cycle) at 0...
February 1, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28130676/a-new-eimerian-apicomplexa-eimeriidae-from-ornate-box-turtle-terrapene-ornata-agassiz-testudines-emydidae-from-northwest-arkansas-usa
#8
Chris T McAllister, Dagmara Motriuk-Smith, Catherine M Kerr, Kristine N Carmen, R Scott Seville, Matthew B Connior
A new species of Eimeria Schneider, 1875 (Apicomplexa: Eimeriidae) collected from an ornate box turtle, Terrapene ornata (Agassiz) from Arkansas, USA, is described. Oöcysts of Eimeria doddi n. sp. are ovoidal to ellipsoidal with a smooth, light to darker brown, bi-layered wall, measure 21.1 × 14.0 µm, and have a length/width (L/W) ratio of 1.5; both micropyle and oöcyst residuum are absent, but a polar granule is present. Sporocysts are ellipsoidal, 9.9 × 6.1 µm, L/W 1.6; the Stieda body is present, but the sub-Stieda and para-Stieda bodies are absent and the sporocyst residuum is composed of small granules in a cluster...
February 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28119243/polydopamine-decoration-on-3d-graphene-foam-and-its-electromagnetic-interference-shielding-properties
#9
Liying Zhang, Ming Liu, Shuguang Bi, Liping Yang, Sunanda Roy, Xiu-Zhi Tang, Chenzhong Mu, Xiao Hu
3D graphene foam was recently demonstrated to exhibit excellent electromagnetic interference (EMI) shielding performance. In this work, we prepared 3D graphene foams by incorporating a surface modification process of graphene via self-polymerization of dopamine with a subsequent foaming process. The multiple roles played by polydopamine (PDA), including as nitrogen doping source and as an enhancement tool to achieve higher extent of reduction of the graphene through providing wider pathways and larger accessible surface areas were discussed in detail...
January 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28116424/-the-effect-of-c-sio2-composite-films-on-corrosion-resistance-of-dental-co-cr-alloy
#10
Yi Huang, Jing-Yu Hu, Yu-Pu Liu, Dong-Yuan Zhao, You-Cheng Yu, Wei Bi
PURPOSE: To study the effect of carbon-silica composite films on corrosion resistance of Co-Cr alloy in simulated oral environment and provide evidences for clinical application of this new material. METHODS: Co-Cr alloy specimens were cut into appropriate size of 20 mm × 20 mm × 0.5 mm. Then, the carbon-silica composite films were spin-coated onto the specimens. Subsequently, ICP-AES was used to observe the Co, Cr, Mo ion concentrations. Finally, Tafel polarization curves of the specimens were used to measure the electrochemical corrosion resistance by electrochemical workstation...
October 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28094258/interfacial-superconductivity-in-a-bi-collinear-antiferromagnetically-ordered-fete-monolayer-on-a-topological-insulator
#11
S Manna, A Kamlapure, L Cornils, T Hänke, E M J Hedegaard, M Bremholm, B B Iversen, Ph Hofmann, J Wiebe, R Wiesendanger
The discovery of high-temperature superconductivity in Fe-based compounds triggered numerous investigations on the interplay between superconductivity and magnetism, and on the enhancement of transition temperatures through interface effects. It is widely believed that the emergence of optimal superconductivity is intimately linked to the suppression of long-range antiferromagnetic (AFM) order, although the exact microscopic picture remains elusive because of the lack of atomically resolved data. Here we present spin-polarized scanning tunnelling spectroscopy of ultrathin FeTe1-xSex (x=0, 0...
January 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28090722/bi-io3-f2-the-first-metal-iodate-fluoride-with-a-very-strong-second-harmonic-generation-effect
#12
Fei-Fei Mao, Chun-Li Hu, Xiang Xu, Dong Yan, Bing-Ping Yang, Jiang-Gao Mao
The first metal iodate fluoride, Bi(IO3 )F2 , with a strong second harmonic generation (SHG) effect has been prepared. Bi(IO3 )F2 crystallizes in the polar space group C2 and features a three-dimensional [BiF2 ](+) cationic framework with IO3 groups capping the inner walls of the one-dimensional tunnels. This [BiF2 ](+) cationic framework acts as a template for the assembly of the polar IO3 units in a favorable superposed fashion, which leads to the polar structure of the material. Bi(IO3 )F2 displays a rather wide transmittance window (0...
January 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28074835/topological-dirac-nodal-lines-and-surface-charges-in-fcc-alkaline-earth-metals
#13
Motoaki Hirayama, Ryo Okugawa, Takashi Miyake, Shuichi Murakami
In nodal-line semimetals, the gaps close along loops in k space, which are not at high-symmetry points. Typical mechanisms for the emergence of nodal lines involve mirror symmetry and the π Berry phase. Here we show via ab initio calculations that fcc calcium (Ca), strontium (Sr) and ytterbium (Yb) have topological nodal lines with the π Berry phase near the Fermi level, when spin-orbit interaction is neglected. In particular, Ca becomes a nodal-line semimetal at high pressure. Owing to nodal lines, the Zak phase becomes either π or 0, depending on the wavevector k, and the π Zak phase leads to surface polarization charge...
January 11, 2017: Nature Communications
https://www.readbyqxmd.com/read/28073064/a-comparative-study-on-electromagnetic-interference-shielding-behaviors-of-chemically-reduced-and-thermally-reduced-graphene-aerogels
#14
Shuguang Bi, Liying Zhang, Chenzhong Mu, Heng Yeong Lee, Jun Wei Cheah, Eng Kee Chua, Kye Yak See, Ming Liu, Xiao Hu
Electromagnetic interference (EMI) shielding performance of chemically and thermally reduced graphene aerogels (GAs) was systematically studied. The EMI shielding mechanisms were extensively analyzed in terms of the distinct surface characteristics resulted from the different reduction methods for the first time. EMI shielding effectiveness (SE) of chemically and thermally reduced GAs reached 27.6 (GAC) and 40.2dB (GAT) at the thickness of 2.5mm, respectively. It was found that the introduction of nitrogen atoms through chemical reduction induced localized charges on the carbon backbone leading to strong polarization effects of GAC...
April 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28068475/fabrication-of-stretchable-nanocomposites-with-high-energy-density-and-low-loss-from-cross-linked-pvdf-filled-with-poly-dopamine-encapsulated-batio3
#15
Yunchuan Xie, Yangyang Yu, Yefeng Feng, Wanrong Jiang, Zhicheng Zhang
In this report, a simple solution-cast method was employed to prepare poly(dopamine) (PDA) encapsulated BaTiO3 (BT) nanoparticle (PDA@BT) filled composites using PVDF matrix cross-linked by the free radical initiator. The effects of both the particle encapsulation and matrix cross-linking on the mechanical and dielectric properties of the composites were carefully investigated. The results suggested that the introduction of BT particles improved permittivity of the composites to ∼30 at 100 Hz when particle contents of only 7 wt % were utilized...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067505/iodide-iodates-m3-io3-12%C3%A2-ag4i-m-bi-tb-with-a-framework-structure-and-high-second-harmonic-generation-optical-response
#16
Elena L Belokoneva, Sergey Yu Stefanovich, Olga V Dimitrova, Alina S Karamysheva, Anatoly S Volkov
Single crystals of two new iodide-iodates, Bi3[IO3]12·Ag4I and Tb3[IO3]12·Ag4I, are synthesized in hydrothermal systems. The anionic parts in both iodide-iodates are characterized as a complex charged framework of isolated IO3 umbrella-like groups and large Bi(Tb)-O polyhedra similar to those previously found in La3[IO3]12[IO3](Pb3O). Broad channels along the c-axis contain compensators: (Ag3I)(2+) umbrella-like groups and additional Ag(+) ions which form Ag4(4+) tetrahedral clusters augmented with I(-) halogen...
January 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28062994/some-remarks-on-the-distribution-and-dispersion-of-coccidia-from-icterid-birds-in-south-america-isospora-guaxi-n-sp-and-isospora-bellicosa-upton-stamper-whitaker-1995-apicomplexa-eimeriidae-from-the-red-rumped-cacique-cacicus-haemorrhous-l-passeriformes-icteridae
#17
Lidiane Maria da Silva, Mariana Borges Rodrigues, Irlane Faria de Pinho, Bruno do Bomfim Lopes, Hermes Ribeiro Luz, Ildemar Ferreira, Carlos Wilson Gomes Lopes, Bruno Pereira Berto
A new species of coccidian, Isospora guaxi n. sp., and Isospora bellicosa Upton, Stamper & Whitaker, 1995 (Protozoa: Apicomplexa: Eimeriidae) are recorded from red-rumped caciques Cacicus haemorrhous (L.) in the Parque Nacional do Itatiaia, Brazil. Isospora guaxi n. sp. has sub-spheroidal oöcysts, measuring on average 30.9 × 29.0 μm, with smooth, bi-layered wall c.1.9 μm thick. Micropyle and oöcyst residuum are absent, but a polar granule is present. Sporocysts are ellipsoidal, measuring on average 19...
January 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28052552/celsr2-encoding-a-planar-cell-polarity-protein-is-a-putative-gene-in-joubert-syndrome-with-cortical-heterotopia-microophthalmia-and-growth-hormone-deficiency
#18
Thierry Vilboux, May Christine V Malicdan, Joseph C Roney, Andrew R Cullinane, Joshi Stephen, Deniz Yildirimli, Joy Bryant, Roxanne Fischer, Meghana Vemulapalli, James C Mullikin, Peter J Steinbach, William A Gahl, Meral Gunay-Aygun
Joubert syndrome is a ciliopathy characterized by a specific constellation of central nervous system malformations that result in the pathognomonic "molar tooth sign" on imaging. More than 27 genes are associated with Joubert syndrome, but some patients do not have mutations in any of these genes. Celsr1, Celsr2, and Celsr3 are the mammalian orthologues of the drosophila planar cell polarity protein, flamingo; they play important roles in neural development, including axon guidance, neuronal migration, and cilium polarity...
January 4, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28046496/tu-h-bra-09-relationship-between-b0-and-the-contrast-to-noise-ratio-cnr-of-tumour-to-background-for-mri-radiotherapy-hybrids
#19
K Wachowicz, N DeZanche, E Yip, V Volotovskyy, B Fallone
PURPOSE: To investigate the relationship in MRI between B0 and the contrast-to-noise ratio (CNR) of various tumour/normal tissue pairs. This study is motivated by the current interest in MRI/radiotherapy hybrids, for which multiple magnetic field strengths have been proposed. CNR is the single most important parameter governing the ability of a system to identify a tumour in real time for treatment guidance. The MRI community has long since recognized that the SNR of a well-designed MR system is roughly proportional to B0 , the polarizing magnetic field...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28032753/thermodynamic-stability-of-bifeo3-0001-surfaces-from-ab-initio-theory
#20
Jian-Qing Dai, Jie-Wang Xu, Jian-Hui Zhu
The relative stability of multiferroic BiFeO3 (0001) surfaces, which is the (111) facet in the pseudocubic notation, with different stoichiometry is systematically studied by using ab initio thermodynamic approach in order to obtain insights into the stable surface terminations. We predict that under most chemical potential conditions the thermodynamically favored terminations for the negative and positive surfaces are -Bi-O2 and -Fe-O3-Bi, respectively. The predicted difference in oxygen content between the negative and positive surfaces is consistent with experimental observations at the BiFeO3/metal interfaces ( Nat...
January 10, 2017: ACS Applied Materials & Interfaces
keyword
keyword
38480
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"