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FeTe1-xSex monolayer films： towards the realization of high-temperature connate topological superconductivity

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Science Bulletin 2017年第7期62卷 503-507页

作者： Xun Shi Zhi-Qing Han Pierre Richard Xian-Xin Wu Xi-Liang Peng Tian Qian shan-cai wang Jiang-Ping Hu Yu-Jie Sun Hong Ding Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics Bering Key Laboratory of Opto-Electronic Functional Materials and Micro-nano Devices Renmin University of China Beijing 100872 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China

We performed angle-resolved photoemission spectroscopy studies on a series of FeTe_(1-x)Se_x monolayer films grown on Sr TiO_*** superconductivity of the films is robust and rather insensitive to the variations of the band position and effective mass caused by the substitution of Se by ***,the band gap between the electron-and hole-like bands at the Brillouin zone center decreases towards band inversion and parity exchange,which drive the system to a nontrivial topological state predicted by theoretical *** results provide a clear experimental indication that the FeTe_(1-x)Se_x monolayer materials are high-temperature connate topological superconductors in which band topology and superconductivity are integrated intrinsically.

关键词： Topological superconductivity Iron-based superconductors Thin film

High-resolution angle-resolved photoemission study of large magnetoresistance topological semimetal CaAl4

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Chinese Physics B 2021年第9期30卷 490-494页

作者： Xu-Chuan Wu Shen Xu Jian-Feng Zhang Huan Ma Kai Liu Tian-Long Xia shan-cai wang Department of Physics Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-nano DevicesRenmin University of ChinaBeijing 100872China

Extremely large magnetoresistance(XMR)has been explored in many nonmagnetic topologically nontrivial/trivial semimetals,while it is experimentally ambiguous which mechanism should be responsible in a specific material due to the complex electronic *** this paper,the magnetoresistance origin of single crystal CaAl4 with C2/m structure at low temperature is investigated,exhibiting unsaturated magnetoresistance of~3000%at 2.5 K and 14 T as the fingerprints of XMR *** the combination of ARPES and the first-principles calculations,we elaborate multiband features and anisotropic Fermi surfaces,which can explain the mismatch of isotropic two-band *** the structural phase transition from I4/mmm to C2/m has been recognized,the subtle impact on electronic structure is revealed by our ARPES *** that both charge compensation and potential topologically nontrivial band structure exist in CaAl4,our findings report CaAl4 as a new reference material for exploring the XMR phenomena.

关键词： magnetoresistance angle-resolved photoemission spectroscopy(ARPES) topological semimetal

Transcranial Sonographic Alterations of Substantia Nigra and Third Ventricle in Parkinson＆#39;s Disease with or without Dementia

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Chinese Medical Journal 2017年第19期130卷 2291-2295页

作者： Zhi-Fen Dong cai-shan wang Ying-Chun Zhang Ying Zhang Yu-Jing Sheng Hua Hu Wei-Feng Luo Chun-Feng Liu Department of Ultrasound The Second Affiliated Hospital of Soochow University Suzhou Jiangsu 215004 China Department of Psychiatry The Second Affiliated Hospital of Soochow University Suzhou Jiangsu 215004 China Department of Neurology The Second Affiliated Hospital of Soochow University Suzhou Jiangsu 215004 China

Background： Numerous studies have demonstrated that patients with Parkinson＆#39;s disease （PD） have a higher prevalence of substantia nigra （SN） hyperechogenicity compared with controls. Our aim was to explore the neuroimaging characteristics of transcranial sonography （TCS） of patients with PD and those with PD with dementia （PDD）. The correlation between the echogenicity of the SN and clinical symptoms in Chinese patients with PDD was also assessed. Methods： The ratios of SN hyperechogenicity （SN＋）, maximum sizes of SN＋, and widths of third ventricle （TV） were measured using TCS for all the recruited patients. Data were analyzed using one-way analysis of variance, rank-sum test, Chi-square test, and receiver-operating characteristic （ROC） curve analysis. Results： The final statistical analysis included 46 PDD patients, 52 PD patients, and 40 controls. There were no significant differences in ratios of SN＋ and maximum sizes of SN＋ between PDD and PD groups （P 〉 0.05）. TV widths were significantly larger in PDD group （7.1± 1.9 mm） than in PD group （6.0± 2.0 mm） and controls （5.9 ± 1.5 mm, P 〈 0.05）; however, the ratios of enlarged TV did not differ among the three groups （P = 0.059）. When cutoff value was set at 6.8 mm, the TV width had a relatively high sensitivity and specificity in discriminating between PDD and PD groups （P = 0.030） and between PDD group and controls （P = 0.003）, based on ROC curve analysis. In PDD patients, SN＋ was more frequently detected in akinetic-rigid subgroup, and patients with SN＋ showed significantly higher Hoehn and Yahr stage and Nonmotor Symptoms Questionnaire scores （P 〈 0.05）. Conclusions： Compared to Chinese patients with PD, patients with PDD had a wider TV, altered SN sonographic features, and more severe clinical symptoms. Our findings suggest that TCS can be used to assess brain atrophy in PD and may be useful in discriminating between PD with and without dementia.

关键词： Dementia Parkinson's Disease Substantia Nigra Third Ventricle Transcranial Sonography

Sonographic Alteration of Basal Ganglia in Different Forms of Primary Focal Dystonia： A Cross-sectional Study

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Chinese Medical Journal 2016年第8期129卷 942-945页

作者： Ying Zhang Ying-Chun Zhang Yu-Jing Sheng Xiao-Fang Chen cai-shan wang Qi Ma Han-Bing Chen Li-Fang Yu Cheng-Jie Mao Kang-Ping Xiong Wei-Feng Luo Chun-Feng Liu Department of Ultrasound The Second Affiliated Hospital of Soochow University Suzhou Jiangsu 215004 China Department of Neurology The Second Affiliated Hospital of Soochow University Suzhou Jiangsu 215004 China

Background：Few studies have addressed whether abnormalities in the lenticular nucleus （LN） are characteristic transcranial sonography （TCS） echo features in patients with primary *** study aimed to explore alterations in the basal ganglia in different forms of primary focal ***：A cross-sectional observational study was performed between December 2013 and December 20 1 4 in 80 patients with different forms of primary focal dystonia and 55 neurologically normal control *** was performed in patients and control *** comparisons of multiple rates were used to compare LN hyperechogenicity ratios between control and patient ***：Thirteen individuals were excluded due to poor temporal bone windows,and two subjects were excluded due to disagreement in evaluation by ***,70 patients （cervical dystonia,n =30;blepharospasm,n =30;oromandibular dystonia,n =10） and 50 normal controls were included in the final *** hyperechogenicity was observed in 51% （36/70） of patients with primary focal dystonia,compared with 12% （6/50） of controls （P 〈 0.001）.Substantia nigra hyperechogenicity did not differ between the two *** hyperechogenicity was observed in 73% （22/30） of patients with cervical dystonia,a greater prevalence than in patients withblepharospasm （33%,10/30,P =0.002） and oromandibular dystonia （40%,4/10,P =0.126）.LN hyperechogenicity was more frequently observed in patients with cervical dystonia compared with controls （73% vs.12%,P 〈 0.001）;however,no significant difference was detected in patients with blepharospasm （33% vs.12%,P =0.021） or oromandibular dystonia （40% vs.12%,P =0.088）.Conclusions：LN hyperechogenicity is more frequently observed in patients with primary focal dystonia than in *** does not appear to be a characteristic TCS echo feature in patients with blepharospasm or oromandibular dystonia.

关键词： Basal Ganglia Lenticular Nucleus Primary Focal Dystonia Transcranial Sonography

Microstructural characteristics and aging response of Zn-containing Al-Mg-Si-Cu alloy

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International Journal of Minerals,Metallurgy and Materials 2013年第7期20卷 659-664页

作者： Yuan-hua cai Cong wang Ji-shan Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Al-Mg-Si-Cu alloys with and without Zn addition were fabricated by conventional ingot metallurgy method. The microstructures and properties were investigated using optical microscopy （OM）, field emission scanning electron microscopy （FE-SEM）, transmission electron microscopy （TEM）, tensile test, hardness test, and electrical conductivity measurement. It is found that the as-cast A1-Mg-Si-Cu-Zn alloy is composed of coarse dendritic grains, long needle-like ~/5-A1FeSi white intermetallics, and Chinese script-like a-A1FeSi compounds. During high temperature homogenization treatment, only harmful needle-like ^-A1FeSi phase undergoes fragmentation and spheroidizing at its tips, and the destruc- tive needle-like 5-phase does not show any morphological and size changes. Phase transitions from ^-A1FeSi to ^-A1FeSi and from 6-A1FeSi to [3-A1FeSi are also not found. Zn addition improves the aging hardening response during the former aging stage and postpones the peak-aged hardness to a long aging time. In T4 condition, Zn addition does not obviously increase the yield strength and decrease the elongation, but it markedly improves paint-bake hardening response during paint-bake cycle. The addition of 0.5wt% Zn can lead to an increment of 99 MPa in yield strength compared with the value of 69 MPa for the alloy without Zn after paint-bake cycle.

关键词： aluminum alloys zinc hardening mechanical properties microstructure

Nonlinear Description of Stimulated Raman Scattering and the Corresponding Four-Wave Process

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Chinese Physics Letters 1997年第9期14卷 678-681页

作者： wang shan-cai HU Xi-wei Department of Modern Physics University of Science and Technology of ChinaHefei 230026

Nonlinear behaviors of the stimulated Raman scattering and the corresponding four-wave process(ω0→ω_(s)+ω_(pl)+ω_(p2))are *** analytic and numerical solutions of the coupling equations which count the decay of th... 详细信息

关键词： Nonlinear wave decay

Microstructure and shear properties evolution of Mn-doped SAC solder joint under isothermal aging

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Journal of Iron and Steel Research International 2023年第8期30卷 1650-1660页

作者： Cheng-ming Li Shu-jin Chen shan-shan cai Ju-bo Peng Xiao-jing wang Ying-wu wang School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina R&D Center Yunnan Tin Group(Holding)Co.Ltd.Kunming 650000YunnanChina Modern School of Engineering Yunnan UniversityKunming 650091YunnanChina

The effects of Mn addition(0.005,0.01,0.03,0.05,and 0.07 wt.%)on microstructure,shear mechanical behavior,and interfacial thermal stabilities of SAC305 joints were investigated under isothermal aging temperatures of 170 C with different aging time(0,250,500,and 750 h).It is found that Mn addition can increase fracture energy of joints without decreasing the shear *** the microstructures have transformed from the eutectic net-like structure in SAC305 solder joints into the structures based onβ-Sn matrix with intermetallic compounds(IMCs)*** doping 0.07 wt.%Mn,the Cu_(6)Sn_(5) growth along the SAC305/Cu interface during thermal aging can be inhibited to some *** isothermal aging at 170°C,the maximum shear force of solder joint decreases continuously with aging time increasing,while the fracture energy rises first and then decreases,reaching the maximum at 500 h compared by that with the microstructure ***_(3)Sn growth between Cu_(3)Sn_(5)/Cu interface has been retarded most at the aging time of 250 h with 0.07 wt.%Mn-doped *** the aging time prolonging,the inhibition effect of Mn on CusSn IMC layer becomes *** strengthening effect of Mn can be explained by precipitation strengthening,and its mechanical behavior can be predicted by particle strengthening model proposed by Orowan.

关键词： SAC305 solder Mn doping Shear mechanical behavior Isothermal aging Interfacial intermetallic compound

A five-component one-pot synthesis of phosphatidylinositol pentamannoside(PIM_5)

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Chinese Chemical Letters 2018年第9期29卷 1340-1342页

作者： Dong wang De-cai Xiong Xin-shan Ye State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University

A practical and efficient synthesis of phosphatidylinositol pentamannoside （PIM5） was achieved based on a five-component one-pot sequential glycosylation protocol with exclusive regio- and stereo-selectivity. Two regioselective sequential glycosylations on inositol and p-tolyl thioglycosides as the sole type of building blocks made this protocol to avoid the tedious protective group manipulations. This synthetic strategy provides access to other important glycolipids with similar structures.

关键词： Phosphatidylinositol pentamannoside Glycosylation Preactivation One-pot synthesis Thioglycoside

河南部分地区奶牛肠道纤毛虫感染情况及分子鉴定

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动物医学进展 2025年第1期46卷 135-140页

作者：丰山旺冯彩彩徐啊慧赵立卓胡苏辉王天奇闫文朝河南科技大学动物科技学院河南洛阳471023

为了明确奶牛肠道纤毛虫的感染情况及其人兽共患风险,从河南省不同地区8个集约化奶牛场中采集462份新鲜粪样,采用粪便直接涂片法镜检和基于18S rDNA和ITS1-5.8S rDNA-ITS2序列对样品中纤毛虫感染情况和分子特性进行了鉴定。结果显示,奶... 详细信息

为了明确奶牛肠道纤毛虫的感染情况及其人兽共患风险,从河南省不同地区8个集约化奶牛场中采集462份新鲜粪样,采用粪便直接涂片法镜检和基于18S rDNA和ITS1-5.8S rDNA-ITS2序列对样品中纤毛虫感染情况和分子特性进行了鉴定。结果显示,奶牛粪便中存在有槽巴克斯顿纤毛虫和结肠小袋纤毛虫,其中有槽巴克斯顿纤毛虫感染率为29.9%,成年牛感染率显著高于其他年龄段奶牛(P0.05),8份样品为有槽巴克斯顿纤毛虫和结肠小袋纤毛虫混合感染。未从奶牛粪便中检出瘤胃内纤毛虫,说明奶牛瘤胃内的共生纤毛虫不随粪便排出体外。研究结果为集约化奶牛场纤毛虫病的防控提供了重要的基础数据。

关键词：奶牛有槽巴克斯顿纤毛虫结肠小袋纤毛虫瘤胃内纤毛虫分子鉴定