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Greatly enhanced mechanical properties of thermoelectric SnSe through microstructure engineering

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Journal of Advanced Ceramics 2023年第5期12卷 1081-1089页

作者： Chen Chen Bin-Hao Wang Chen Chen Hai-Dong Zhao Bin Zhang Dan Wang Tao Shen Peng-Hui Li Song Zhao Dong-Li Yu yong-jun tian Bo Xu Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China School of Physical Sciences Great Bay UniversityDongguan 523000China

The outstanding thermoelectric material, SnSe, is also known for its inferior mechanical properties, which bring great inconvenience for its application in thermoelectric devices. In this work, SnSe bulks were prepared via a sequential procedure of high-pressure synthesis (HPS), ball milling, and spark plasma sintering (SPS). The produced polycrystalline samples with a unique microstructure of tightly-bound quasi-equiaxed grains exhibited excellent mechanical properties. The Vickers hardness (HV), compressive strength (σ_(c)), and bending strength (σ_(b)) reached 1.1 GPa, 300 MPa, and 90 MPa, respectively, all of which are far superior to those of ordinary polycrystalline SnSe. Furthermore, the microstructures did not deteriorate thermoelectric performance. This work demonstrated an effective procedure to prepare polycrystalline microstructure-engineered SnSe materials, which not only show advantages in device applications but also shed light on property enhancement for other layer-structured thermoelectric materials.

关键词： thermoelectric materials SnSe mechanical properties hardness

Robust ultra-microporous metal-organic frameworks for highly efficient natural gas purification

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Nano Research 2023年第10期16卷 12338-12344页

作者： Li Zhao Pengxiao Liu Chenghua Deng Ting Wang Sha Wang yong-jun tian Jin-Sheng Zou Xue-Cui Wu Ying Zhang Yun-Lei Peng Zhenjie Zhang Michael J.Zaworotko Department of Applied Chemistry College of ScienceChina University of Petroleum(Beijing)Beijing 102249China College of Chemistry Nankai UniversityTianjin 300071China State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China Department of Chemical Sciences Bernal InstituteUniversity of LimerickLimerick V94T9PXRepublic of Ireland Basic Research Centre for Energy Interdisciplinary China University of Petroleum(Beijing)Beijing 102249China Department of Materials Science and Engineering College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China

The development of highly efficient separation technology for the purification of natural gas by removing ethane(C_(2)H_(6))and propane(C_(3)H_(8))is a crucial but challenging task to their efficient utilization in the chemical industry and social ***,we report three isomorphic ultra-microporous metal-organic frameworks(MOFs),M-pyz(M=Fe,Co,and Ni,and pyz=pyrazine)referred to as Fe-pyz,Co-pyz,and Ni-pyz,respectively,which possess high density of open metal sites and suitable pore *** with the benchmark materials reported,M-pyz not only has high adsorption capacities of C_(2)H_(6)and C_(3)H_(8)at low pressure(up to 51.6 and 63.7 cm^(3)·cm^(−3)),but also exhibits excellent C_(3)H_(8)/CH_(4)and C_(2)H_(6)/CH_(4)ideal adsorption solution theory(IAST)selectivities,111 and 25,*** calculations demonstrated that the materials’separation performance was driven by multiple intermolecular interactions(hydrogen bonding interactions and van der Waals effect)between gas molecules(C_(2)H_(6)and C_(3)H_(8))and the M-pyz binding ***,dynamic breakthrough experiments verified the superior reusability and practical separation feasibility for the ternary CH_(4)/C_(2)H_(6)/C_(3)H_(8)***,M-pyz can be synthesized rapidly and on a large scale at room *** work presents a series of promising MOFs adsorbents to efficiently purify natural gas and promotes the industrial development process of MOFs materials.

关键词： natural gas methane adsorption separation ultra-microporous metal-organic frameworks(MOFs)

Inhibition of hepatitis B virus replication by APOBEC3G in vitro and in vivo

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World Journal of Gastroenterology 2006年第28期12卷 4492-4497页

作者： Yan-Chang Lei You-Hua Hao Zheng-Mao Zhang yong-jun tian Bao-Ju Wang Yan Yang Xi-Ping Zhao Meng-Ji Lu Fei-Li Gong Dong-Liang Yang Division of Clinical Immunology Department of Infectious Diseases Tongji Hospital of Tongji Medical College Huazhong University of Science and Technology. Wuhan 430030. Hubei Province. China Center of Experimental Medicine Tongji Hospital of Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China Department of Microbiology Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China Department of Immunology Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China 不详

AIM： To investigate the effect of APOBEC3G mediated antiviral activity against hepatitis B virus （HBV） in cell cultures and replication competent HBV vector-based mouse model. METHODS： The mammalian hepatoma cells Huh7 and HepG2 were cotransfected with various amounts of CMV-driven expression vector encoding APOBEC3G and replication competent 1.3 fold over-length HBV. Levels of HBsAg and HBeAg in the media of the transfected cells were determined by ELISA. The expression of HBcAg in transfected cells was detected by western blot. HBV DNA and RNA from intracellular core particles were examined by Northern and Southern blot analyses. To assess activity of the APOBEC3G in vivo, an HBV vector-based model was used in which APOBEC3G and the HBV vector were co-delivered via high-volume tail vein injection. Levels of HBsAg and HBV DNA in the sera of mice as well as HBV core-associated RNA in the liver of mice were determined by ELISA and quantitative PCR analysis respectively. RESULTS： There was a dose dependent decrease in the levels of intracellular core-associated HBV DNA and extracellular production of HBsAg and HBeAg. The levels of intracellular core-associated viral RNA also decreased, but the expression of HBcAg in transfected cells showed almost no change. Consistent with in vitro results, levels of HBsAg in the sera of mice were dramatically decreased. More than 1.5 log10 decrease in levels of serum HBV DNA and liver HBV RNA were observed in the APOBEC3G-treated groups compared with the control ***： These findings indicate that APOBEC3G could suppress HBV replication and antigen expression both in vivo and in vitro, promising an advance in treatment of HBV infection.

关键词： APOBEC3G Hepatitis B virus Antiviral therapy

N-terminal and C-terminal cytosine deaminase domain of APOBEC3G inhibit hepatitis B virus replication

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World Journal of Gastroenterology 2006年第46期12卷 7488-7496页

作者： Yan-Chang Lei yong-jun tian Hong-Hui Ding Bao-Ju Wang Yan Yang You-Hua Hao Xi-Ping Zhao Meng-Ji Lu Fei-Li Gong Dong-Liang Yang Division of Clinical Immunology Department of Infectious Disease Tongji Hospital of Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China Center of Experimental Medicine Tongji Hospital of Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China Department of Microbiology Tongji Medical College Huazhong University of Science and Technology Wuhan430030 Hubei Province China Institute of Virology Medical School of Duisburg-Essen University Essen Germany Department of Immunology Tongji Medical College Huazhong University of Science and Technology Wuhan430030 Hubei Province China

AIM: To investigate the effect of human apolipoprotein B mRNA-editing enzyme catalytic-polypeptide 3G (APOBEC3G) and its N-terminal or C-terminal cytosine deaminase domain-mediated antiviral activity against hepatitis B virus (HBV) in vitro and in vivo. METHODS: The mammalian hepatoma cells HepG2 and HuH7 were cotransfected with APOBEC3G and its N-terminal or C-terminal cytosine deaminase domain expression vector and 1.3-fold-overlength HBV DNA as well as the linear monomeric HBV of genotype B and C. For in vivo study, an HBV vector-based mouse model was used in which APOBEC3G and its N-terminal or C-terminal cytosine deaminase domain expression vectors were co-delivered with 1.3-fold-overlength HBV DNA via high-volume tail vein injection. Levels of hepatitis B virus surface antigen (HBsAg) and hepatitis B virus e antigen (HBeAg) in the media of the transfected cells and in the sera of mice were determined by *** expression of hepatitis B virus core antigen (HBcAg) in the transfected cells was determined by Western blot analysis. Core-associated HBV DNA was examined by Southern blot analysis. Levels of HBV DNA in the sera of mice as well as HBV core-associated RNA in the liver of mice were determined by quantitative PCR and quantitative RT-PCR analysis, respectively. RESULTS: Human APOBEC3G exerted an anti-HBV activity in a dose-dependent manner in HepG2 cells, and comparable suppressive effects were observed on genotype B and C as that of genotype A. Interestingly, the N-terminal or C-terminal cytosine deaminase domain alone could also inhibit HBV replication in HepG2 cells as well as Huh7 cells. Consistent with in vitro results, the levels of HBsAg in the sera of mice were dramatically decreased, with more than 50 times decrease in the levels of serum HBV DNA and core-associated RNA in the liver of mice treated with APOBEC3G and its N-terminal or C-terminal cytosine deaminase domain as compared to the controls. CONCLUSION: Our findings provide probably the f

关键词： Cytosine deaminase domain Apolipoprotein B mRNA-editing enzyme catalytic-polypeptide 3G Hepatitis B virus Antiviral therapy

Pressure-Induced Structural Transition and Enhanced Photoelectric Properties of Tm_(2)S_(3)

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Chinese Physics Letters 2024年第11期41卷 77-86页

作者： Zhi-Wei Shen Zhong-Yan Wu Shao-Jie Wang He-Chong Wang Hong-Kai Li Jing Song Guo-Ying Gao Lin Wang yong-jun tian Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and Technology(MMST)Yanshan UniversityQinhuangdao 066004China

Rare earth sesquisulfides have drawn growing attention in photoelectric applications because of their excellent electronic and photoelectric properties upon *** investigate the structural,electrical,and photoelectric properties of Tm_(2)S_(3) under high pressure through electrical impedance,UV-vis absorption,Raman spectroscopy,x-ray diffraction,and photoelectric *** is found that δ-Tm_(2)S_(3) transforms into high-pressure𝛼-phase around 5GPa,accompanied by a substantial reduction in atomic distance,bandgap,and ***,the photocurrent density and responsivity of Tm_(2)S_(3) exhibit dramatic increase behavior,achieving five orders of magnitude enhancement in α-phase compared with the initial δ-Tm_(2)S_(3).Moreover,α-phase maintains a high photocurrent responsivity of three orders of magnitude after *** work demonstrates significant enhancement of the photoelectric properties of Tm_(2)S_(3) by applying pressure,which paves the way for improving the performance of future photoelectric devices.

关键词： Transition electrical photoelectric

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中等卫生职业教育应推广医院信息系统的教学

中国数字医学 2008年第2期3卷 76-77页

作者：赵昌伦贵州省毕节地区卫生学校

中等卫生职业教育对信息技术的教学要求与现实医院实践需要存在脱节的问题,尤其是对医院信息系统的教学内容缺少必要的强制性要求。因此,在中等卫生职业教育中适当推广医院信息系统的教学,可以促进培养目标与实际需要的联系,从而推动中... 详细信息

中等卫生职业教育对信息技术的教学要求与现实医院实践需要存在脱节的问题,尤其是对医院信息系统的教学内容缺少必要的强制性要求。因此,在中等卫生职业教育中适当推广医院信息系统的教学,可以促进培养目标与实际需要的联系,从而推动中等卫生职业教育的健康发展。

关键词：卫生职业教育医院信息系统信息技术中等教育

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基于正交分解的自适应直扩系统窄带干扰抑制

系统仿真学报 2009年第6期21卷 1671-1674页

作者：孙永军田斌易克初西安电子科技大学综合业务网国家重点实验室西安710071

为了提高对不同窄带干扰的抑制效果,提出一种利用Householder正交分解的QRD-LMS的自适应非线性干扰抑制算法.由于利用了正交分解以及阶数递推结构,使得自适应算法计算复杂度低,与传统LMS算法计算量相当。同时算法具有较小的条件数并且... 详细信息

为了提高对不同窄带干扰的抑制效果,提出一种利用Householder正交分解的QRD-LMS的自适应非线性干扰抑制算法.由于利用了正交分解以及阶数递推结构,使得自适应算法计算复杂度低,与传统LMS算法计算量相当。同时算法具有较小的条件数并且可以取较大的步长,使其稳健性以及跟踪性能明显优于LMS。将窄带干扰建模为多频、自回归过程以及数字窄带信号。仿真结果表明,方法在不同信噪比下,其干扰抑制效果要明显好于归一化LMS算法以及RLS算法。

关键词：窄带干扰非线性预测 QR分解干扰抑制

Staged dendrite suppression for high safe and stable lithium-sulfur batteries

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Journal of Energy Chemistry 2025年第1期100卷 674-683页

作者： jun Jiang Zhenjie Lu Yanwen Ding Shujun Liu Zhijie Qi tian Tang Yunfan Zhang Zhiyuan Ma Jingwen Sun Liang Xue Wenyao Zhang Pan Xiong Xin Wang junwu Zhu yongsheng Fu Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education Nanjing University of Science and Technology Jiangsu Pylon Battery Co.Ltd

The unavoidable dendrite growth and shuttle effect have long been stranglehold challenges limiting the safety and practicality of lithium-sulfur ***,we propose a dual-action strategy to address the lithium dendrite issue in stages by constructing a multifunctional surface-negatively-charged nanodiamond layer with high ductility and robust puncture resistance on polypropylene （PP） *** uniformly loaded compact negative layer can not only significantly enhance electron transmission efficiency and promote uniform lithium deposition,but also reduce the formation of dendrite during early deposition *** importantly,under the strong puncture stress encountered during the deterioration of lithium dendrite growth under limiting current,the high ductility and robust puncture resistance（145.88 MPa） of as-obtained nanodiamond layer can effectively prevent short circuits caused by unavoidable lithium *** Li||Li symmetrical cells assembled with nanodiamond layer modified PP demonstrated a stable cycle of over 1000 h at 2 mA cm-2with a polarization voltage of only 29.3 ***,the negative charged layer serves as a physical barrier blocking lithium polysulfide ions,effectively mitigating capacity *** improved cells achieved a capacity decay of only 0.042%per cycle after 700 cycles at 3 C,demonstrating effective suppression of dendrite growth and capacity attenuation,showing promising prospect.

关键词： Lithium-sulfur batteries Staged dendrite suppression Shuttle effect Surface-negatively-charged nanodiamond

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筒式网振动筛固相运移动力学研究

石油学报 2004年第6期25卷 109-112页

作者：侯勇俊田道云张明洪西南石油学院机电工程学院四川成都610500 四川石油局宏华有限公司四川广汉618300

介绍了一种用于钻井液振动筛的新型筒式结构筛网 ,这种筛网工作时与筛箱一起振动 ,同时还绕自身轴线作为旋转运动 ,具有自洁作用 ,可大大提高筛分效率。为了定量分析固相颗粒在筒式筛网上的运移规律 ,对固相颗粒在筒式筛网上的受力情况... 详细信息

介绍了一种用于钻井液振动筛的新型筒式结构筛网 ,这种筛网工作时与筛箱一起振动 ,同时还绕自身轴线作为旋转运动 ,具有自洁作用 ,可大大提高筛分效率。为了定量分析固相颗粒在筒式筛网上的运移规律 ,对固相颗粒在筒式筛网上的受力情况进行了分析 ,建立了固相运移动力学模型 ,提出了筒式筛网的抛掷指数、抛掷运移速度及其计算方法 ,讨论了筒式筛网的旋转角速度对固相运移速度的影响 ,给出了旋转角度的极限值计算公式。理论计算结果与试验结果吻合较好。

关键词：振动筛筒式筛网固相运移动力学试验