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Chinese Chemical Letters 2016年第3期27卷 441-446页

作者： Ting Zhang Dong-Qing xu Jun-Ming Chen Ping Zhang xu-chun wang School of Chemistry and Material Engineering Anhui Science and Technology University Center of Analysis and Measurement Anhui Science and Technology University

A group of novel, carbazole-based dendrimers comprised of the electron-accepting dibenzothiophene core and the electron-donating oligo-carbazole dendrons, namely G1 SF and G2 SF, are synthesized utilizing the Ullmann C–N coupling reaction. The dendrimers are designed in such a way to show good solubility in common organic solvents, excellent thermochemical stability with decomposition temperatures（Td） up to430 8C, and high HOMO levels in a range from 5.45 e V to 5.37 e V. Results of density functional theory calculations（DFT） indicate G2 SF has an almost complete separation of HOMO and LUMO levels at the holeand electron-transporting moieties; while G1 SF exhibits only partial separation of the HOMO and LUMO levels possibly due to intramolecular charge transfer. Green phosphorescent OLEDs were fabricated by the spin coating method with the dendrimers as hosts and traditional green iridium phosphor as doped emitter. Under ambient conditions, a maximum luminance efficiency（hL） of 19.83 cd A^-1and a maximum external quantum efficiency of 5.85% are achieved for G1 SF, and 15.50 cd A ^-1and 4.57% for G2 SF.

关键词： OLEDs Bipolar host materials Dendrimer Carbazole Dibenzothiophene

Phase Stability,Elastic,Thermo-physical and Electronic Properties of Hexa-(Mo,Cr,W)_2C from First-principles Calculations

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Journal of Iron and Steel Research International 2016年第10期23卷 1096-1103页

作者： Di WU Wan-tang FU Yong LI chun-xu wang Jing-lin TANG College of Mechanical Engineering Yanshan University Institute for Structural Materials Central Iron and Steel Research Institute State Key Laboratory of Metastable Materials Science and Technology Yanshan University

Phase stability,elastic properties,thermo-physical properties,as well as electronic properties of hexa-（Mo,Cr,W）2C carbides were investigated by first-principles *** results indicated that the Mo8C4,Mo7Cr1C4,Mo7W1C4,Mo6W2C4,and Mo6W1Cr1C4 are stable and the stability follows the sequence：Mo6W1Cr1C4〉Mo7W1C4〉Mo7Cr1C4〉 Mo6W2C4〉 ***6W1Cr1C4 shows the highest stability,deformation resistance and hardness.G/B（shear modulus/bulk modulus）and Poisson′s ratio of the stable hexa-（Mo,Cr,W）2C are all larger than 1.75 and 0.26,respectively,which indicates that they are all *** anisotropies are mainly due to the different Vogit shear modulus/Reuss shear modulus;the mechanical anisotropy of Mo7Cr1C4 is the largest,and that of Mo8C4 is the ***,the obtained Debye temperatureΘDand heat capacity Cpindicate that Mo6W2C4 possesses the best thermal conductivity（ΘD=497.72K）,while Mo7Cr1C4 and Mo6W2C4possess the largest heat capacity when the temperature is in the range of 0-10 Kand larger than 10 K,*** the electronic property analysis,the doped Cr and W atoms can not only participate in orbitals hybridization themselves but also enhance the orbitals hybridization between Mo and C atoms,which can reinforce the interatomic interactions.

关键词： hexa (Mo,Cr, W)2C carbide elastic property electronic structure thermo-physical property first-principles calculation

Effects of solid-solution temperature on microstructure and mechanical properties of a novel 2000MPa grade ultra-high-strength steel

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Journal of Iron and Steel Research International 2020年第6期27卷 710-718页

作者： chun-xu wang Yuan-hang Gao Yong Li Shun Han Shao-zun Liu Peng-jie Zhang Central Iron and Steel Research Institute Beijing100081China

A novel 2000 MPa grade ultra-high-strength steel AIR0509 with high fracture toughness and low cost has recently been developed. The effects of solid-solution temperature on the microstructure and mechanical properties of this steel were inves-tigated. The increase in solid-solution temperature first increased and then decreased the values of ultimate strength (UTS) and Charpy U-notch (CUN) energy. The increase in the UTS and CUN values was caused by the dissolution of the primary carbides M6C and MC, while the decrease in both strength and toughness was due to the increase in the prior austenite grain size. Samples that were solid-solution treated at 1000℃ exhibited an optimal combination of strength and toughness with a UTS of 2020MPa, yield strength of 1780MPa, and CUN energy of 68J, as well as a correlative fracture toughness KIC value of about 105MPam1/2.

关键词： Ultra-high-strength steel Solid-solution treatment Carbide Mechanical property Microstructure

Facile one-step synthesis of PdPb nanochains for high-performance electrocatalytic ethanol oxidation

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Rare Metals 2020年第7期39卷 792-799页

作者： Yong Zhang Xiao-Lei Yuan Feng-Lei Lyu xu-chun wang Xiao-Jing Jiang Mu-Han Cao Qiao Zhang Institute of Functional Nano and Soft Materials FUNSOM Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China School of Chemistry and Chemical Engineering Nantong UniversityNantong 226019China

The widespread application of direct ethanol fuel cells is hampered due to the low activity,high cost and poor operation durability of electrocatalysts for ethanol oxidation reaction(EOR).Herein,we report a one-pot synthetic method to synthesize PdPb3 nanochains with well-defined shape,size and composition via a solution-phase reduction *** morphology,composition distribution and structure characteristics of PdPb3 nanochains were investigated by transmission electron microscopy,X-ray photoelectron spectroscopy and X-ray *** to the unique structure,the as-obtained PdPb3 nanochains can manifest much higher mass activity(2523 mA·mg-1)and higher operation durability than commercial Pd/C(1272 mA·mg-1)during the EOR *** importantly,further CO-stripping measurements indicate that the incorporation of Pb species could favor the oxidative removal of CO intermediates on the Pd electrode at the negative potential and enhance the EOR activity and stability,making it possible to develop highly active and durable electrocatalysts.

关键词： PdPb Nanochains Ethanol oxidation reaction CO stripping Electrocatalysts

Liver fibrosis and hepatic stellate cells: Etiology, pathological hallmarks and therapeutic targets

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World Journal of Gastroenterology 2016年第48期22卷 10512-10522页

作者： Chong-Yang Zhang Wei-Gang Yuan Pei He Jia-Hui Lei chun-xu wang Department of Pathogenic Biology School of Basic Medicine Tongji Medical College Huazhong University of Science and Technology Department of Anthropotomy School of Basic Medicine Tongji Medical College Huazhong University of Science and Technology Department of Obstetrics and Gynecology Wuhan NO.1 Hospital Affiliated with Tongji Medical College Huazhong University of Science and Technology

Liver fibrosis is a reversible wound-healing process aimed at maintaining organ integrity, and presents as the critical pre-stage of liver cirrhosis, which will eventually progress to hepatocellular carcinoma in the absence of liver transplantation. Fibrosis generally results from chronic hepatic injury caused by various factors, mainly viral infection, schistosomiasis, and alcoholism; however, the exact pathological mechanisms are still unknown. Although numerous drugs have been shown to have antifibrotic activity in vitro and in animal models, none of these drugs have been shown to be efficacious in the clinic. Importantly, hepatic stellate cells(HSCs) play a key role in the initiation, progression, and regression of liver fibrosis by secreting fibrogenic factors that encourage portal fibrocytes, fibroblasts, and bone marrow-derived myofibroblasts to produce collagen and thereby propagate fibrosis. These cells are subject to intricate cross-talk with adjacent cells, resulting in scarring and subsequent liver damage. Thus, an understanding of the molecular mechanisms of liver fibrosis and their relationships with HSCs is essential for the discovery of new therapeutic targets. This comprehensive review outlines the role of HSCs in liver fibrosis and details novel strategies to suppress HSC activity, thereby providing new insights into potential treatments for liver fibrosis.

关键词： Liver cirrhosis Fibrosis Hepatic stellate cells Etiology Pathology Treatment

Effect of annealing time on microstructure and mechanical properties of cryorolled AISI 310S stainless steel

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Journal of Iron and Steel Research International 2023年第3期30卷 548-556页

作者： xue-kui Lian Yong Li Yi Xiong Yong-li Wu Shun Han Tian-tian He chun-xu wang Feng-zhang Ren Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023HenanChina Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang 471023HenanChina

AISI 310S stable austenitic stainless steel was subjected to 90%cryorolling and then annealed at 800 ℃ for 2-60 *** effect of annealing time on the microstructure and mechanical properties was studied by optical microscopy,scanning electron microscopy,transmission electron microscopy,microhardness and tensile *** results show that the grain size of AISI 310S stainless steel is refined to the nanometer level after 90%cryorolling,and the grain size is approximately 20 *** the increase in annealing time,the degree of grain recrystallization occurs more fully and completely,as the grain begins to grow and then tends to *** strength and hardness of the annealed specimens decrease with increasing annealing time,while elongation tends to *** the annealing time is 10 min,the yield strength increases by about 2 times compared to that of the original austenite(unrolled),and the elongation is also above 20%,which is the best preparation process for ultra-fine grain austenitic stainless steel under this experimental *** the annealing time treatment increases,the fracture morphology changes from mixed quasi-cleavage and ductile fracture(after cryorolling)to ductile fracture(after annealing).

关键词： Austenitic stainless steel Cryorolling Annealing time Microstructure Mechanical property

A Novel ATM Antisense Transcript ATM-AS Positively Regulates ATM Expression in Normal and Breast Cancer Cells

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Current Medical Science 2022年第4期42卷 681-691页

作者： He CHENG Er-shao ZHANG Xiao SHI Ping-ping CAO Bei-jing PAN Xin-xin SI Yue LIU Nan YANG Ying CHU xu-chun wang Xiao HAN Zhi-hong ZHANG Yu-jie SUN Key Laboratory of Human Functional Genomics of Jiangsu Province Nanjing Medical UniversityNanjing 210000China Department of Pathology the First Affiliated Hospital of Nanjing Medical UniversityNanjing 210000China Key Laboratory of Cancer Biomarkers Prevention and TreatmentCollaborative Innovation Center for Personalized Cancer MedicineNanjing Medical UniversityNanjing 210000China Department of Cell Biology Nanjing Medical UniversityNanjing 210000China

Objective:The ataxia telangiectasia mutated(ATM)gene is a master regulator in cellular DNA damage *** dysregulation of ATM expression is frequent in breast cancer,and is known to be involved in the carcinogenesis and prognosis of ***,the underlying mechanism remains *** bioinformatic analysis predicted a potential antisense transcript ATM-antisense(AS)from the opposite strand of the ATM *** purpose of this study was to identify ATM-AS and investigate the possible effect of ATM-AS on the ATM gene ***:Single strand-specific RT-PCR was performed to verify the predicted antisense transcript ATM-AS within the ATM gene ***-PCR and Western blotting were used to detect the expression levels of ATM-AS and ATM in normal and breast cancer cell lines as well as in tissue *** reporter gene assays,biological mass spectrometry,ChIP-qPCR and RIP were used to explore the function of ATM-AS in regulating the ATM *** and host-cell reactivation(HCR)assay were performed to evaluate the biological significance of ATM-AS in ATM-mediated DNA damage *** cancer tissue samples were used for evaluating the correlation of the ATM-AS level with the ATM expression as well as prognosis of the ***:The ATM-AS significantly upregulated the ATM gene activity by recruiting KAT5 histone acetyltransferase to the gene *** reduced ATM-AS level led to the abnormal downregulation of ATM expression,and impaired the ATM-mediated DNA damage repair in normal breast cells in *** ATM-AS level was positively correlated with the ATM expression in the examined breast cancer tissue samples,and the patient ***:The present study demonstrated that ATM-AS,an antisense transcript located within the ATM gene body,is an essential positive regulator of ATM expression,and functions by mediating the binding of KAT5 to the ATM *** findings uncover the novel mechanism und

关键词： antisense transcript ataxia telangiectasia mutated ataxia telangiectasia mutatedantisense breast cancer KAT5

Curvature-enhanced multipartite coherence in the multiverse

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Chinese Physics C 2024年第7期48卷 259-272页

作者：吴树民王春旭王锐迪李金璇黄晓理曾浩生 Department of Physics Liaoning Normal UniversityDalian 116029China Department of Physics Hunan Normal UniversityChangsha 410081China

Here,we study the quantum coherence of N-partite Greenberger-Horne-Zeilinger(GHZ)and W states in the multiverse consisting of N causally disconnected de Sitter ***,N-partite coherence increases monotonically with curvature,whereas the curvature effect destroys quantum entanglement and discord,indicating that the curvature effect is beneficial to quantum coherence and harmful to quantum correlations in the *** find that with an increase in n expanding de Sitter spaces,the N-partite coherence of the GHZ state increases monotonically for any curvature,whereas the quantum coherence of the W state decreases or increases monotonically depending on the *** find a distribution relationship,which indicates that the correlated coherence of the N-partite W state is equal to the sum of all bipartite correlated coherence in the *** coherence exhibits unique properties in the multiverse,suggesting that it may provide some evidence for the existence of the multiverse.

关键词： multiverse curvature effect multipartite coherence

嵌入控制油腔的静压主轴轴心运动主动控制分析与试验

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吉林大学学报（工学版） 2023年第4期53卷 973-981页

作者：陈淑江徐春望路长厚王康山东大学机械工程学院济南250061

为了进一步提高机床主轴的回转精度,在不增加主轴机械结构复杂度的情况下,通过控制主动单面薄膜节流阀,主动调整嵌入控制油腔的静压轴承的油膜力,对主轴的径向运动进行控制。基于雷诺方程以及流量守恒方程得到轴承油膜力,建立了主轴轴... 详细信息

为了进一步提高机床主轴的回转精度,在不增加主轴机械结构复杂度的情况下,通过控制主动单面薄膜节流阀,主动调整嵌入控制油腔的静压轴承的油膜力,对主轴的径向运动进行控制。基于雷诺方程以及流量守恒方程得到轴承油膜力,建立了主轴轴心运动的理论模型。基于PID控制器进行了主轴径向回转误差主动控制的理论和实验研究,对比分析了不同类型载荷条件下的主轴轴心运动控制情况。结果表明,在定载荷条件下,该主动控制静压主轴系统能够将轴心保持在目标位置;在动载荷条件下,轴心运动幅度能够得到有效降低且运动中心相比于无控制的情况更靠近目标位置。

关键词：机械电子工程回转精度主动控制静压轴承轴心运动

Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie wang Wei wang xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model