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Wang ZB

Tongyun Huang, Tianxing Ma, Li-Gang Wang
We perform a systematic study of the Zitterbewegung effect of fermions, which are described by a Gaussian wave with broken spatial-inversion symmetry in a three-dimensional low-energy Weyl semimetal.
 Our results show that the motion of fermions near the Weyl points is characterized by rectilinear motion and Zitterbewegung oscillation.
 The ZB oscillation is affected by the width of the Gaussian wave packet, the position of the Weyl node, and the chirality and anisotropy of the fermions. By introducing a one-dimensional cosine potential, the new generated massless fermions have lower Fermi Velocities, which results in a robust relativistic oscillation...
May 3, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Suqin Xue, Fuchun Zhang, Shuili Zhang, Xiaoyang Wang, Tingting Shao
The electronic structure, band structure, density of state, and magnetic properties of Ni-doped zinc-blende (ZB) ZnO are studied by using the first-principles method based on the spin-polarized density-functional theory. The calculated results show that Ni atoms can induce a stable ferromagnetic (FM) ground state in Ni-doped ZB ZnO. The magnetic moments mainly originate from the unpaired Ni 3 d orbitals, and the O 2 p orbitals contribute a little to the magnetic moments. The magnetic moment of a supercell including a single Ni atom is 0...
April 26, 2018: Nanomaterials
Hassan Ali, Yunyan Zhang, Jing Tang, Kai Peng, Sibai Sun, Yue Sun, Feilong Song, Attia Falak, Shiyao Wu, Chenjiang Qian, Meng Wang, Zhanchun Zuo, Kui-Juan Jin, Ana M Sanchez, Huiyun Liu, Xiulai Xu
Defects are detrimental for optoelectronics devices, such as stacking faults can form carrier-transportation barriers, and foreign impurities (Au) with deep-energy levels can form carrier traps and nonradiative recombination centers. Here, self-catalyzed p-type GaAs nanowires (NWs) with a pure zinc blende (ZB) structure are first developed, and then a photodetector made from these NWs is fabricated. Due to the absence of stacking faults and suppression of large amount of defects with deep energy levels, the photodetector exhibits room-temperature high photoresponsivity of 1...
April 3, 2018: Small
Jingzhu Zhang, Xuehua Zhou, Zhe Wang, Lingxiao Yang, Jing Wang, Wenxing Wang
The chemical compositions in PM2.5 in metropolitan areas have obtained lots of attentions, of which concerns of airborne trace elements are relatively lacking. Here, PM2.5 samples were collected simultaneously in one year at four urban sites (Zibo (ZB), Zaozhuang (ZZ), Qingdao (QD) and Jinan (JN (Shandong University)), and a rural site (JN (Miaopu)) in Shandong province. 25 elements (Al, Na, Cl, Mg, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Br, Sr, Cd, Ba and Pb) in PM2.5 were measured by wavelength dispersive X-ray fluorescence spectrometer (WDXRF)...
April 15, 2018: Science of the Total Environment
Yu-Ming Wei, Ying Yu, Jing Wang, Lin Liu, Hai-Qiao Ni, Zhi-Chuan Niu, Jun-Tao Li, Xue-Hua Wang, Si-Yuan Yu
We investigate optical second harmonic generation (SHG) from individual self-catalyzed zinc-blende (ZB) GaAs nanowires (NWs), where the polarimetry strongly depends on the NW diameter. We report a direct observation on the SHG induced by surface nonlinear susceptibilities in a single, ultra-thin GaAs NW. By considering the contributions from both optical field and structural discontinuities in our theoretical model, we can well explain the optical SHG polarimetry from NWs with different diameters. We also show that the optical in-coupling coefficient arising from the depolarization electromagnetic field can determine the polarization of the SHG...
October 26, 2017: Nanoscale
Jun-Jie Wu, Hong-Jin Wang, Shuai Yang, Yang Liu, Xiao-Yu Xu
Previous studies showed that borneol could promote some drugs crossing through the blood-brain-barrier (BBB) at certain conditions. However, the mechanism has not been clarified yet. This study aimed to investigate the effect of bornrol on promoting catalpol and puerarin through BBB and explore the relevant mechanism. The focal cerebral ischemic rats were divided into 7 groups randomly and then were administered corresponding drugs: model group (M, solvent), catalpol-puerarin group (ZG, catalpol 45 mg•kg⁻¹+puerarin 200 mg•kg⁻¹), catalpol-puerarin-bornrol group(ZGB, catalpol 45 mg•kg⁻¹+puerarin 200 mg•kg⁻¹ +bornrol 200 mg•kg⁻¹), catalpol-bornrol group(ZB, catalpol 45 mg•kg⁻¹ +bornrol 200 mg•kg⁻¹), puerarin-bornrol group(GB, puerarin 200 mg•kg⁻¹ +bornrol 200 mg•kg⁻¹), butoxamine-ZG group(BTX+ZG, butoxamine 1...
November 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Pengfei Lu, Dan Liang, Yingjie Chen, Chunfang Zhang, Ruge Quhe, Shumin Wang
A theoretical study of InNBi alloy by using density functional theory is presented. The results show non-linear dependence of the lattice parameters and bulk modulus on Bi composition. The formation energy and thermodynamic stability analysis indicate that the InNBi alloy possesses a stable phase over a wide range of intermediate compositions at a normal growth temperature. The bandgap of InNBi alloy in Wurtzite (WZ) phase closes for Bi composition higher than 1.5625% while that in zinc-blende (ZB) phase decreases significantly at around 356 meV/%Bi...
September 6, 2017: Scientific Reports
Jinxu Cao, Baixue Yang, Yumei Wang, Chen Wei, Hongyu Wang, Sanming Li
The feasibility of polymer brush as drug delivery vehicle was demonstrated with the goal of improving the dissolution and physical stability of poorly water-soluble drugs. Polymer brush CTAB/ZB-1 was synthesized by electrostatic interaction using a physical modification method with anionic poly (propylene-g-styrene sulphonic acid) fiber (ZB-1) as the substrate and cationic hexadecyltrimethylammonium bromide (CTAB) as the modifier. The polymer brush structure of CTAB/ZB-1 was validated by atomic force microscopy (AFM) and the channels of brush provided the drug loading sites...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Ying Yu, Jing Wang, Yu-Ming Wei, Zhang-Kai Zhou, Hai-Qiao Ni, Zhi-Chuan Niu, Xue-Hua Wang, Si-Yuan Yu
We demonstrate the utility of optical second harmonic generation (SHG) polarimetry to perform structural characterization of self-assembled zinc-blende/wurtzite III-V nanowire heterostructures. By analyzing four anisotropic SHG polarimetric patterns, we distinguish between wurtzite (WZ), zinc-blende (ZB) and ZB/WZ mixing III-V semiconducting crystal structures in nanowire systems. By neglecting the surface contributions and treating the bulk crystal within the quasi-static approximation, we can well explain the optical SHG polarimetry from the NWs with diameter from 200-600 nm...
July 6, 2017: Nanotechnology
Lei Zhang, Xiurong Ke, Lingzhi Lin, Jun Xiao, Xianyan Yang, Juncheng Wang, Guojing Yang, Sanzhong Xu, Zhongru Gou, Zhanjun Shi
Due to the low strength and high brittleness of 45S5 Bioglass(®), it is still a great challenge for the three-dimensional porous 45S5 Bioglass(®) to treat mechanically required loaded bone defects. Therefore, 45S5 Bioglass(®)-derived bioactive glass-ceramic (BGC) porous scaffolds were fabricated at a low temperature sintering condition with and without the addition of 4% low-melting ZnO/B2O3 (ZB) bioactive glass as a reinforcing agent and using 350- or 500 μm paraffin microspheres as a porogen. The pore structure characterization for the scaffolds indicated that the scaffolds containing 4% ZB had very good macroporous structures of ∼313 and ∼448 μm in pore size and over 70% porosity with appreciable strength (>15 MPa), which was about four times higher than that those manufactured without ZB and with 350 μm porogen scaffolds...
June 7, 2017: Biomedical Materials
Ying Yu, Yu-Ming Wei, Jing Wang, Jia-Hua Li, Xiang-Jun Shang, Hai-Qiao Ni, Zhi-Chuan Niu, Xue-Hua Wang, Si-Yuan Yu
Nanowire quantum dots (NW-QDs) can be used for future compact and efficient optoelectronic devices. Many efforts have been made to control the QD states by inserting the QDs in doped structures and applying an electric field in a nanowire system. In this paper, we use down-conversion and up-conversion photoluminescence excitations to explore the optical and electronic properties of single quantum dots in GaAs/AlGaAs core-shell nanowires. We investigate a large optical Stark shift in this system as a new method to tune the QD states...
May 4, 2017: Nanoscale
Mengge Zhou, Xiaoyao Ma, Guoyu Ding, Zengyong Wang, Dan Liu, Yongling Tong, Hong Zhou, Jie Gao, Yuanyuan Hou, Min Jiang, Gang Bai
Many species of Bulbus fritillariae are used as traditional medicines for thousands of years; however, their application is not standardized. To clarify the differences and homologies, the antimuscarinic and anti-inflammatory effects of five BM species were firstly tested and compared at cellular level. With an integrated strategy combining UPLC-Q/TOF MS, PCA and ANN analysis, the active ingredients among 28 different chemical markers were predicted and identified. SB and QB extracts showed the best antimuscarinic effects and several steroidal alkaloids, such as solanidine, contributed to this effects...
January 15, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Fudong Wang, Richard A Loomis, William E Buhro
We report ensemble extinction and photoluminesence spectra for colloidal CdTe quantum wires (QWs) with nearly phase-pure, defect-free wurtzite (WZ) structure, having spectral line widths comparable to the best ensemble or single quantum-dot values, to the single polytypic (having WZ and zinc blende (ZB) alternations) QW values, and to those of two-dimensional quantum belts or platelets. The electronic structures determined from the multifeatured extinction spectra are in excellent agreement with the theoretical results of WZ QWs having the same crystallographic orientation...
September 27, 2016: ACS Nano
Jianjun Liang, Ying Wang, Beicheng Liang
[Purpose] This study investigated the clinical efficacy of the compound gouteng tincture combined with Zhoubo (GT-ZB) in treating the sequelae of cerebral concussion (CC) in children. [Subjects and Methods] Sixty children with CC-sequelae were randomily divided into a treatment group and a control group, with 30 cases in each group. The treatment group was treated using GT-ZB, and the control group was treated using the standard method of venoruton, dibazol, and Vitamin B6. The efficacies of the two treatments were compared...
July 2016: Journal of Physical Therapy Science
Shaohua Wang, Zhengying You, Mao Feng, Jiaqian Che, Yuyu Zhang, Qiujie Qian, Setsuko Komatsu, Boxiong Zhong
Silkworm is used as a model organism to analyze two standard complex traits, which are high and low silk yields. To understand the molecular mechanisms of silk production, the posterior silk glands aged to the third day of the fifth instar were analyzed from the ZB strain with low silk production and from the control strain Lan10. Using isobaric tags for relative and absolute quantification (iTRAQ) quantitative shotgun proteomics and RNA-sequencing-based transcriptomics, 139 proteins and 630 transcripts were identified as novel in the ZB strain compared with the Lan10 strain, indicating that these results significantly expand the coverage of proteins and transcripts of the posterior silk glands in the silkworm...
January 4, 2016: Journal of Proteome Research
Bing Yang, Baodan Liu, Yujia Wang, Hao Zhuang, Qingyun Liu, Fang Yuan, Xin Jiang
Zn doped GaN nanowires with different doping levels (0, <1 at%, and 3-5 at%) have been synthesized through a chemical vapor deposition (CVD) process. The effect of Zn doping on the defect evolution, including stacking fault, dislocation, twin boundary and phase boundary, has been systematically investigated by transmission electron microscopy and first-principles calculations. Undoped GaN nanowires show a hexagonal wurtzite (WZ) structure with good crystallinity. Several kinds of twin boundaries, including (101¯3), (101¯1) and (202¯1), as well as Type I stacking faults (…ABABCBCB…), are observed in the nanowires...
October 21, 2015: Nanoscale
Yang Fan, Bing Wang, He Huang, Kai Wang, Hua Long, Peixiang Lu
We theoretically investigate the plasmonic Zitterbewegung (ZB) effect in binary graphene sheet arrays (GSAs). The surface plasmon polariton (SPP) modes of two minibands are realized by alternately varying the chemical potentials of individual graphene sheets in the arrays. Numerical simulations show that SPPs in the array experience characteristic trembling motion. The oscillating periods of the plasmonic ZB are strongly dependent on the propagation constant mismatch and varied in the range of micrometer, while the amplitude reaches tens of nanometers, making the ZB effect easier to be observed in practice...
July 1, 2015: Optics Letters
Q D Zhuang, Ezekiel A Anyebe, R Chen, H Liu, Ana M Sanchez, Mohana K Rajpalke, Tim D Veal, Z M Wang, Y Z Huang, H D Sun
For the first time, we report a complete control of crystal structure in InAs(1-x)Sb(x) NWs by tuning the antimony (Sb) composition. This claim is substantiated by high-resolution transmission electron microscopy combined with photoluminescence spectroscopy. The pure InAs nanowires generally show a mixture of wurtzite (WZ) and zinc-blende (ZB) phases, where addition of a small amount of Sb (∼2-4%) led to quasi-pure WZ InAsSb NWs, while further increase of Sb (∼10%) resulted in quasi-pure ZB InAsSb NWs. This phase transition is further evidenced by photoluminescence (PL) studies, where a dominant emission associated with the coexistence of WZ and ZB phases is present in the pure InAs NWs but absent in the PL spectrum of InAs0...
February 11, 2015: Nano Letters
Aiguo Xin, Mingwang Zhu, Zhenqi Peng, Qi Hu, Chenhong Shi, Defang Liao, Jihua Wang, Huachun Li
The molecular basis of attenuation of foot-and-mouth disease virus (FMDV) serotype Asia1 ZB strain remains unknown. To understand the genetic changes of attenuation, we compared the entire genomes of three different rabbit-passaged attenuated ZB strains (ZB/CHA/58(att), ZBRF168, and ZBRF188) and their virulent parental strains (ZBCF22 and YNBS/58). The results showed that attenuation may be brought about by 28 common amino acid substitutions in the coding region, with one nucleotide point mutation in the 5'-untranslated region (5'-UTR) and another one in the 3'-UTR...
2014: International Journal of Genomics
Yuda Wang, Howard E Jackson, Leigh M Smith, Tim Burgess, Suriati Paiman, Qiang Gao, Hark Hoe Tan, Chennupati Jagadish
Using transient Rayleigh scattering (TRS) measurements, we obtain photoexcited carrier thermalization dynamics for both zincblende (ZB) and wurtzite (WZ) InP single nanowires (NW) with picosecond resolution. A phenomenological fitting model based on direct band-to-band transition theory is developed to extract the electron-hole-plasma density and temperature as a function of time from TRS measurements of single nanowires, which have complex valence band structures. We find that the thermalization dynamics of hot carriers depends strongly on material (GaAs NW vs InP NW) and less strongly on crystal structure (ZB vs WZ)...
December 10, 2014: Nano Letters
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