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https://www.readbyqxmd.com/read/28809680/high-performance-saw-resonator-on-new-multi-layered-substrate-using-litao3-crystal
#1
Tsutomu Takai, Hideki Iwamoto, Yuichi Takamine, Hisashi Yamazaki, Toshiyuki Fuyutsume, Haruki Kyoya, Takeshi Nakao, Hajime Kando, Masahiro Hiramoto, Takanori Toi, Masayoshi Koshino, Norio Nakajima
To develop the high performance filters and duplexers required for recent LTE frequency bands in mobile handsets, a surface acoustic wave (SAW) resonator is needed that have higher quality (Q) and a lower temperature coefficient of frequency (TCF). To achieve this, the authors focused on acoustic energy confinement in the depth direction for a rotated Y-X LiTaO3 (LT) substrate. Characteristics of multi-layered substrates with low impedance and high impedance layers under LT layer were studied numerically in terms of acoustic energy distribution, phase velocity, coupling coefficient and temperature characteristics employing a finite element method (FEM) simulation...
August 10, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28805396/transport-properties-of-a-two-dimensional-pbse-square-superstructure-in-an-electrolyte-gated-transistor
#2
Maryam Alimoradi Jazi, Vera A E C Janssen, Wiel H Evers, Athmane Tadjine, Christophe Delerue, Laurens D A Siebbeles, Herre S J van der Zant, Arjan J Houtepen, Daniël Vanmaekelbergh
Self-assembled nanocrystal solids show promise as a versatile platform for novel opto-electronic materials. Superlattices composed of a single layer of lead-chalcogenide and cadmium-chalcogenide nanocrystals with epitaxial connections between the nanocrystals, present outstanding questions to the community regarding their predicted band structure and electronic transport properties. However, the as-prepared materials are intrinsic semiconductors; to occupy the bands in a controlled way, chemical doping or external gating is required...
August 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28803026/novel-mesoporous-graphitic-carbon-nitride-modified-pbbio2br-porous-microspheres-with-enhanced-photocatalytic-performance
#3
Bin Wang, Jun Di, Gaopeng Liu, Sheng Yin, Jiexiang Xia, Qi Zhang, Huaming Li
Sustainable mesoporous graphitic carbon nitride (mpg-C3N4) modified PbBiO2Br porous microsphere (mpg-C3N4/PbBiO2Br) had been successfully synthesized via solvothermal process. Multiple techniques were applied to explore the structure, morphology, optical and electronic properties of the as-prepared photocatalysts. It could be found that the mpg-C3N4 was uniformly distributed on the surface of the PbBiO2Br porous microsphere. Compared with the pure PbBiO2Br, the mpg-C3N4/PbBiO2Br exhibited superior photocatalytic activity for the degradation of organic pollutants under visible light irradiation...
July 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28796685/using-an-elastic-band-device-after-a-severe-obstetric-pubic-symphyseal-separation-clinical-and-imaging-evaluation
#4
Jeremy Lasbleiz, François-Xavier Sevestre, Pierre-Yves Moquet
BACKGROUND: Severe separation of the pubic symphysis is a rare delivery complication. Facing this pathology, we decided to study a new elastic band device. METHOD: To evaluate the elastic band device, clinical (pain-rated) and imaging (magnetic resonance imaging and radiography) evaluations with and without the device were performed. The elastic band device is a European Conformity-certified medical device, which is made of neoprene straps, that reduces the mobility of the pelvis and the use of the internal rotator muscles...
August 4, 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28790181/anomalous-relaxation-kinetics-and-charge-density-wave-correlations-in-underdoped-bapb1-x-bi-x-o3
#5
D Nicoletti, E Casandruc, D Fu, P Giraldo-Gallo, I R Fisher, A Cavalleri
Superconductivity often emerges in proximity of other symmetry-breaking ground states, such as antiferromagnetism or charge-density-wave (CDW) order. However, the subtle interrelation of these phases remains poorly understood, and in some cases even the existence of short-range correlations for superconducting compositions is uncertain. In such circumstances, ultrafast experiments can provide new insights by tracking the relaxation kinetics following excitation at frequencies related to the broken-symmetry state...
August 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28774252/acute-traumatic-swan-neck-deformity-a-case-report-of-the-oblique-retinacular-ligament-lesion
#6
Giuseppe Checcucci, Marco Biondi, Marina Faccio, Piergiuseppe Zampetti, Mariarosaria Galeano, Massimo Ceruso
Swan neck deformity (SND) can be the manifestation of an acute trauma. We present a case report of a young basketball player with an acute traumatic SND determined by the single ulnar oblique retinacular ligament rupture. The patient caught a ball directly upon the tip of his right's hand middle finger into extension. He immediately presented a SND with impossibility to actively flex the proximal interphalangeal joint (PIPJ), while preserving active flexion and extension of the distal interphalangeal joint (DIPJ)...
September 2017: Journal of Hand Surgery Asian-Pacific Volume
https://www.readbyqxmd.com/read/28773835/computational-search-for-two-dimensional-mx2-semiconductors-with-possible-high-electron-mobility-at-room-temperature
#7
Zhishuo Huang, Wenxu Zhang, Wanli Zhang
Neither of the two typical two-dimensional materials, graphene and single layer MoS 2 , are good enough for developing semiconductor logical devices. We calculated the electron mobility of 14 two-dimensional semiconductors with composition of MX 2 , where M (=Mo, W, Sn, Hf, Zr and Pt) are transition metals, and Xs are S, Se and Te. We approximated the electron phonon scattering matrix by deformation potentials, within which long wave longitudinal acoustical and optical phonon scatterings were included. Piezoelectric scattering in the compounds without inversion symmetry is also taken into account...
August 23, 2016: Materials
https://www.readbyqxmd.com/read/28773816/effects-of-rapid-thermal-annealing-on-the-structural-electrical-and-optical-properties-of-zr-doped-zno-thin-films-grown-by-atomic-layer-deposition
#8
Jingjin Wu, Yinchao Zhao, Ce Zhou Zhao, Li Yang, Qifeng Lu, Qian Zhang, Jeremy Smith, Yongming Zhao
The 4 at. % zirconium-doped zinc oxide (ZnO:Zr) films grown by atomic layer deposition (ALD) were annealed at various temperatures ranging from 350 to 950 °C. The structural, electrical, and optical properties of rapid thermal annealing (RTA) treated ZnO:Zr films have been evaluated to find out the stability limit. It was found that the grain size increased at 350 °C and decreased between 350 and 850 °C, while creeping up again at 850 °C. UV-vis characterization shows that the optical band gap shifts towards larger wavelengths...
August 13, 2016: Materials
https://www.readbyqxmd.com/read/28772385/effect-of-intrinsic-stress-on-structural-and-optical-properties-of-amorphous-si-doped-sno%C3%A2-thin-film
#9
Honglong Ning, Xianzhe Liu, Hongke Zhang, Zhiqiang Fang, Wei Cai, Jianqiu Chen, Rihui Yao, Miao Xu, Lei Wang, Linfeng Lan, Junbiao Peng, Xiaofeng Wang, Zichen Zhang
The effect of intrinsic stress on the structure and physical properties of silicon-tin-oxide (STO) films have been investigated. Since a state of tensile stress is available in as-deposited films, the value of stress can be exponentially enhanced when the annealing temperature is increased. The tensile stress is able to not only suppress the crystallization and widen the optical band gap of STO films, but also reduce defects of STO films. In this report, the good electrical performance of STO thin-film transistors (TFTs) can be obtained when annealing temperature is 450 °C...
January 1, 2017: Materials
https://www.readbyqxmd.com/read/28771370/photoisomerization-of-protonated-azobenzenes-in-the-gas-phase
#10
Michael S Scholz, James N Bull, Neville J A Coughlan, Eduardo Carrascosa, Brian D Adamson, Evan John Bieske
Due to their high photoisomerization efficiencies, azobenzenes and their functionalized derivatives are used in a broad range of molecular photoswitches. Here, the photochemical properties of the trans isomers of protonated azobenzene (ABH(+)) and protonated 4-aminoazobenzene (NABH(+)) cations are investigated in the gas phase using a tandem ion mobility spectrometer. Both cations display a strong photoisomerization response across their S1←S0 bands, with peaks in their photoisomerization yields at 435 nm and 525 nm, respectively, red-shifted with respect to the electronic absorption bands of the unprotonated AB and NAB molecules...
August 3, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28767219/anomalous-ambipolar-transport-of-organic-semiconducting-crystals-via-control-of-molecular-packing-structures
#11
Beomjin Park, Kyunghun Kim, Jaesung Park, Heeseon Lim, Phung Thi Lanh, A-Rang Jang, Chohee Hyun, Chang Woo Myung, Seungkyoo Park, Jeong Won Kim, Kwang S Kim, Hyeon Suk Shin, Geunsik Lee, Se Hyun Kim, Chan Eon Park, Jin Kon Kim
Organic crystals deposited on 2-dimensional (2D) van der Waals substrates have been widely investigated due to their unprecedented crystal structures and electrical properties. van der Waals interaction between organic molecules and the substrate induces epitaxial growth of high quality organic crystals and their anomalous crystal morphologies. Here, we report on unique ambipolar charge transport of a "lying-down" pentacene crystal grown on a 2D hexagonal boron nitride van der Waals substrate. From in-depth analysis on crystal growth behavior and ultraviolet photoemission spectroscopy measurement, it is revealed that the pentacene crystal at the initial growth stage have a lattice-strained packing structure and unique energy band structure with a deep highest occupied molecular orbital level compared to conventional "standing-up" crystals...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28762331/quantitative-determination-of-synthesized-genotoxic-impurities-in-nifuroxazide-capsules-by-validated-chromatographic-methods
#12
Nada S Abdelwahab, Nouruddin W Ali, Marco M Zaki, M Abdelkawy, Mohammed T El-Saadi
Two accurate, selective, and precise chromatographic methods, namely TLC-densitometric and reversed-phase (RP)-HPLC, were developed and validated for the simultaneous determination of nifuroxazide (NIF) and its four synthesized impurities, which are also reported to be its related substances in the range of 10–100 μg/band and 10–100 μg/mL for NIF in the TLC and RP-HPLC methods, respectively. The developed TLC-densitometric method depended on the separation and quantitation of the studied components on silica gel 60 F254 TLC plates...
July 31, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28759987/theoretical-investigation-of-biaxially-tensile-strained-germanium-nanowires
#13
Zhongyunshen Zhu, Yuxin Song, Qimiao Chen, Zhenpu Zhang, Liyao Zhang, Yaoyao Li, Shumin Wang
We theoretically investigate highly tensile-strained Ge nanowires laterally on GaSb. Finite element method has been used to simulate the residual elastic strain in the Ge nanowire. The total energy increment including strain energy, surface energy, and edge energy before and after Ge deposition is calculated in different situations. The result indicates that the Ge nanowire on GaSb is apt to grow along 〈100〉 rather than 〈110〉 in the two situations and prefers to be exposed by {105} facets when deposited a small amount of Ge but to be exposed by {110} when the amount of Ge exceeds a critical value...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28749545/optimization-of-throughput-in-semipreparative-chiral-liquid-chromatography-using-stacked-injection
#14
Mohammadreza Taheri, Mohsen Fotovati, Seyed-Kiumars Hosseini, Alireza Ghassempour
An interesting mode of chromatography for preparation of pure enantiomers from pure samples is the method of stacked injection as a pseudocontinuous procedure. Maximum throughput and minimal production costs can be achieved by the use of total chiral column length in this mode of chromatography. To maximize sample loading, often touching bands of the two enantiomers is automatically achieved. Conventional equations show direct correlation between touching-band loadability and the selectivity factor of two enantiomers...
July 27, 2017: Chirality
https://www.readbyqxmd.com/read/28745744/spin-dependent-interactions-catalyse-the-oxygen-electrochemistry
#15
J Gracia
The technological interest of oxygen reduction and evolution reactions, ORR and OER, for the clean use and storage of energy has resulted in the discovery of multiple catalysts; and the physical and catalytic properties of the most active compositions are only comprehensible with the consideration of magnetic interactions. Spin dependent potentials via exchange interactions, spin-orbit coupling or through magneto-electric effects catalyse the oxygen electrochemistry. The best catalysts show metal sites with localized spins and electron delocalization; a correlation exists between the rate constant for charge transfer reactions and spin-dependent electron mobility...
August 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28743393/considerations-for-the-use-of-ultra-high-pressures-in-liquid-chromatography-for-2-1mm-inner-diameter-columns
#16
K Broeckhoven, G Desmet
The current contribution investigates the effects of viscous heat dissipation in chromatographic columns (with an emphasis on so-called narrow bore columns with an inner diameter of 2.1mm) using numerical simulations of the temperature and velocity profiles and the resulting band broadening, for the first time at operating pressures up to 2000bar. When operating columns under well-thermostatted conditions to maintain a constant temperature of the mobile phase, a dramatic increase in plate heights can be observed that voids any advantage one could expect from the possibility to use smaller particles offered by the increased pressure limit...
July 12, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28742962/characterization-of-intramolecular-interactions-of-cytochrome-c-using-hydrogen-deuterium-exchange-trapped-ion-mobility-spectrometry-mass-spectrometry-and-molecular-dynamics
#17
Juan Camilo Molano-Arevalo, Kevin Jeanne Dit Fouque, Khoa Pham, Jaroslava Miksovska, Mark E Ridgeway, Melvin A Park, Francisco Fernandez-Lima
Globular proteins, such as cytochrome c (cyt c), display an organized native conformation, maintained by a hydrogen bond interaction network. In the present work, the structural interrogation of kinetically trapped intermediates of cyt c was performed by correlating the ion-neutral collision cross section (CCS) and charge state with the starting solution conditions and time after desolvation using collision induced activation (CIA), time-resolved hydrogen/deuterium back exchange (HDX) and trapped ion mobility spectrometry-mass spectrometry (TIMS-MS)...
August 11, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28740199/fermi-surface-topology-and-signature-of-surface-dirac-nodes-in-labi
#18
Ratnadwip Singha, Biswarup Satpati, Prabhat Mandal
Novel topological state of matter is one of the rapidly growing fields in condensed matter physics research in recent times. While these materials are fascinating from the aspect of fundamental physics of relativistic particles, their exotic transport properties are equally compelling due to the potential technological applications. Extreme magnetoresistance and ultrahigh carrier mobility are two such major hallmarks of topological materials and often used as primary criteria for identifying new compounds belonging to this class...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28739934/crossover-from-band-like-to-thermally-activated-charge-transport-in-organic-transistors-due-to-strain-induced-traps
#19
Yaochuan Mei, Peter J Diemer, Muhammad R Niazi, Rawad K Hallani, Karol Jarolimek, Cynthia S Day, Chad Risko, John E Anthony, Aram Amassian, Oana D Jurchescu
The temperature dependence of the charge-carrier mobility provides essential insight into the charge transport mechanisms in organic semiconductors. Such knowledge imparts critical understanding of the electrical properties of these materials, leading to better design of high-performance materials for consumer applications. Here, we present experimental results that suggest that the inhomogeneous strain induced in organic semiconductor layers by the mismatch between the coefficients of thermal expansion (CTE) of the consecutive device layers of field-effect transistors generates trapping states that localize charge carriers...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28737790/tuning-the-gap-of-lead-based-halide-perovskites-by-introducing-superalkali-species-at-the-cationic-sites-of-abx3-type-structure
#20
C Paduani, Andrew M Rappe
We study with scalar relativistic density functional theory (DFT) calculations the effect of changes in the ionicity of the bonding mechanism and charge donation on the structure and electronic properties of new lead halide perovskites which show promising performance in optoelectronic applications as long-wave infrared detectors and thermoelectrics. Our results provide evidence that the band gap of these compounds can be tuned upon the introduction of appropriate superalkali moieties at the cationic A-sites in the CsPbI3-type structure...
August 9, 2017: Physical Chemistry Chemical Physics: PCCP
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