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Dynamic impact properties of deep sandstone under thermal-hydraulicmechanical coupling loads

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Journal of Mountain Science 2024年第6期21卷 2113-2129页

作者： cao Chunhui DING Haonan zou Baoping School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China Zhejiang-Singapore Joint Laboratory for Urban Renewal and Future City Hangzhou 310023China

The deep rock mass within coal mines situated in a challenging environment are characterized by high ground stress,high geotemperature,high osmotic water pressure,and dynamic disturbances from mechanical *** investigate the impact of this complex mechanical environment on the dynamic characteristics of roof sandstone in self-formed roadways without coal pillars,standard specimens of deep sandstone from the 2611 upper tunnel working face of the Yongmei Company within the Henan Coal Chemical Industry Group in Henan,China were prepared,and an orthogonal test was *** a self-developed geotechnical dynamic impact mechanics test system,triaxial dynamic impact tests under thermal-hydraulicmechanical coupling conditions were conducted on deep *** results indicate that under high confining pressure,deep sandstone exhibits pronounced brittle failure at low temperatures,with peak strength gradually decreasing as temperature and osmotic water pressure ***,under low confining pressure and low temperature,the brittleness of deep sandstone weakens gradually,while ductility ***,sandstone demonstrates higher peak strength at low temperatures under high axial pressure conditions,lower peak strength at high temperatures,and greater strain under low axial pressure and high osmotic water *** in impact air pressure and osmotic water pressure have proportionally greater effects on peak stress and peak *** 50%of the input strain energy is utilized as effective energy driving the sandstone fracture *** analysis identifies the optimal combination of factors affecting the peak stress and peak strain of *** the coupling effect,intergranular and transgranular fractures occur within the *** images illustrate that the damage forms range from minor damage with multiple fissures to extensive fractures and severe *** study elucidates the varied dynamic impact me

关键词： Deep sandstone Thermal-hydraulicmechanical coupling Dynamic impact Stress-strain Failure Modes Polar analysis

Activity, but not Expression, of Soluble and Cell Wall-Bound Acid Invertases Is Induced by Abscisic Acid in Developing Apple Fruit

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Journal of Integrative Plant Biology 2006年第5期48卷 536-549页

作者： Qiu-Hong Pan Xiang-Chun Yu Na Zhang Xun zou Chang-cao Peng Xiu-Ling Wang Ke-Qin zou Da-Peng Zhang China State Key Laboratory of Plant Physiology and Biochemistry China Agricultural University Beijing 100094 China

The present experiment, involving both the in vivo injection of abscislc acid （ABA） Into apple （Malus domestica Brohk.） fruits and the in vivo Incubation of fruit tissues in ABA-contalnlng medium, revealed that ABA activates both soluble and cell wall-bound acid invertases. Immunoblottlng and enzyme-linked Immunosorbent assays showed that this ABA-induced acid invertase activation is Independent of the amount of enzyme present. The acid Invertase activation induced by ABA is dependent on medium pH, time course, ABA dose, living tissue and developmental stage. Two isomers of cls-（＋）-ABA, （-）-ABA and trans- ABA, had no effect on acid invertases, showing that ABA-induced acid invertase activation is specific to physiologically active cis-（＋）ABA. Protein kinase inhlbltors K252a and H7 as well as acid phosphatase Increased the ABA-Induced effects. These data indicate that ABA specifically activates both soluble and cell wall-bound acid Invertases by a posttranslational mechanism probably Involving reversible protein phosphorylatlon, and this may be one of the mechanisms by which ABA Is Involved In regulating fruit development.

关键词： abscisic acid acid invertase apple fruit protein phosphorylation sucrose metabolism.

Research on an innovative structure of an open-ribbed steel-ultra-high performance concrete composite bridge deck

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Frontiers of Structural and Civil Engineering 2024年第5期18卷 716-730页

作者： Xudong SHAO Xuan SUN Deqiang zou Junhui cao Chuanqi YANG School of Civil Engineering Hunan UniversityKey Laboratory for Wind and Bridge Engineering of Hunan ProvinceChangsha 410082China China Construction Fifth Engineering Division Co. Ltd.Changsha 410004China

To completely solve the problem of fatigue cracking issue of orthotropic steel bridge decks(OSDs),the authors proposed a steel–ultra-high performance concrete(UHPC)lightweight composite deck(LWCD)with closed ribs in *** on the successful application of that LWCD,an adaptation incorporating an innovative composite deck structure,i.e.,the hot-rolled section steel–UHPC composite deck with open ribs(SSD)is proposed in this paper,aiming to simplify the fabrication process as well as to reduce the cost of *** on a long-span cable-stayed bridge,a design scheme is proposed and is compared with the conventional OSD ***,a finite element(FE)calculation is conducted to reflect both the global and local behavior of the SSD scheme,and it is found that the peaked stresses in the SSD components are less than the corresponding allowable values.A static test is performed for an SSD strip specimen to understand the anti-cracking behavior of the UHPC layer under negative bending *** static test results indicate that the UHPC layer exhibited a satisfactory tensile toughness,the UHPC tensile strength obtained from the test is 1.8 times the calculated stress by the FE model of the real *** addition,the fatigue stresses of typical fatigue-prone details in the SSD are calculated and evaluated,and the influences of key design parameters on the fatigue performance of the SSD are *** to the fatigue results,the peaked stress ranges for all of the 10 fatigue-prone details are within the corresponding constant amplitude fatigue *** a fatigue test is carried out for another SSD strip specimen to explore the fatigue behavior of the fillet weld between the longitudinal and transverse *** specimen failed at the fillet weld after equivalent 47.5 million cycles of loading under the design fatigue stress range,indicating that the fatigue performance of the SSD could meet the fatigue design *** calculations and experim

关键词： steel-ultra-high performance concrete composite deck open rib strip model test static and fatigue performance orthotropic steel deck

心电图MVP评分对阵发性心房颤动射频导管消融术术后复发的预测价值

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实用心电学杂志 2024年第5期33卷 454-460页

作者：路瑜刘梓瑞杨正凯王皓铖时星宇邹操苏州大学附属第一医院心血管内科江苏苏州215006

目的探讨阵发性心房颤动(paroxysmal atrial fibrillation,PAF)患者射频导管消融术术前体表心电图MVP评分对术后复发的预测价值。方法选取接受射频导管消融术的PAF住院患者299例为研究对象,根据心房颤动(简称房颤)复发与否分为房颤复发... 详细信息

目的探讨阵发性心房颤动(paroxysmal atrial fibrillation,PAF)患者射频导管消融术术前体表心电图MVP评分对术后复发的预测价值。方法选取接受射频导管消融术的PAF住院患者299例为研究对象,根据心房颤动(简称房颤)复发与否分为房颤复发组(n=40)和窦性心律(简称窦律)维持组(n=259)。比较两组间术前MVP评分。通过ROC曲线分析确定MVP评分预测房颤消融术术后复发的最佳截断值,应用MVP评分临界值进行房颤消融术术后复发的生存曲线分析。结果(1)PAF患者消融术术后随访时间22.0(11.0,35.0)月,总体未复发率86.6%;(2)与窦律维持组相比,房颤复发组患者病程长[12.0(3.0,48.0)月vs.36.0(11.5,72.0)月,P<0.05]、术前MVP评分增加[(2.20±0.94)分vs.(3.40±1.12)分,P<0.01)],其余术前指标间差异无统计学意义;(3)单因素Cox回归分析提示,术前MVP评分和病程是影响房颤消融术术后复发的危险因素;多因素Cox回归分析结果显示,高术前MVP评分(OR=2.261,95%CI 1.700~3.007,P<0.01)是PAF消融术术后复发的独立危险因素;(4)PAF患者术前MVP评分预测消融术术后复发的ROC曲线下面积(AUC)为0.76(95%CI 0.674~0.843,P<0.05),最佳截断值为3分,敏感性为63.0%、特异性为85.0%。结论术前心电图MVP评分对PAF患者射频导管消融术术后复发有一定的预测价值。

关键词：阵发性心房颤动射频导管消融复发 MVP评分

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Effect of metoprolol on sarcoplasmic reticulum Ca^2＋ leak in a rabbit model of heart failure

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Chinese Medical Journal 2012年第5期125卷 815-822页

作者： ZHANG Shi-jie LIU Zhi-hua zou cao WANG Lei Department of Laboratory MedicineFirst Affiliated Hospital of ZhengzhouUniversity Zhengzhou Henan 450052 China Department ofEmergency First Affiliated Hospital of ZhengzhouUniversity Zhengzhou Henan 450052 China Department of Cardiology First Affiliated Hospital of SoochowUniversity Suzhou Jiangsu 215006 China

Background Studies have shown that B-blockers can improve cardiac performance in heart failure （HF） by reversing protein kinase A （PKA）-mediated sarcoplasmic reticulum （SR） Ca^2＋ leak. However, it is being strongly questioned as to whether the PKA-mediated ryanodine receptor （RyR2） hyper-phosphorylation is a critical regulator of SR Ca^2＋ leak. In this study, we used a rabbit HF model to investigate whether β-blockers affect SR Ca^2＋ leak by other potential mechanisms.

关键词： β-blocker heart failure Ca^2+ leak ryanodine receptor phosphorylation

The Influence of Laser Shock Processing to TC4 Titanium Alloy TIG Welding Bead Microstructure and Properties

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稀有金属材料与工程 2011年第S4期40卷 206-210页

作者： Xu Haiying,Che Zhegang,zou Shikun,cao Ziwen Science and Technology on Power Beam Processes Laboratory,Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China Beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

TC4 titanium tungsten inert gas arc (TIG) weld beads were treated by laser shock processing (LSP) *** a single and multiple times LSP introduced,surface hardness,tensile mechanical properties and fatigue life of those weld joints were *** results showed that:compared with TC4 titanium alloy TIG joints without LSP treatment,those weld beads surface hardness on weld zone and heat affected zone are nearly *** fatigue life of those TC4 TIG weld joints treated by a single time LSP process is *** the LSP times increased,TC4 titanium alloy weld beads tensile strength and yield strength are not obviously *** special elongation of these welding joints treated by different times LSP treatment will be influenced *** elongation of those joints is decreased with the LSP treatment times increased from one to *** welding joint special elongation was reduced to the least degree since three times LSP treatment had been introduced.

关键词： laser shock processing titanium alloy HV hardness tensile properties fatigue life

Two UV organic-inorganic hybrid antimony-based materials with superior optical performance derived from cation-anion synergetic interactions

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Chinese Chemical Letters 2024年第9期35卷 442-446页

作者： Pu Zhang Xiang Mao Xuehua Dong Ling Huang Liling cao Daojiang Gao Guohong zou College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610066China College of Chemistry Sichuan UniversityChengdu 610065China

Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by ***,cation-anion synergetic interactions strategy was proposed to develop two novel organic-inorganic hybrid antimony-based optical materials,(C_(3)H_(5)N_(2))Sb F_(2)SO_(4)(I)and(C_(5)H_(6)N)Sb F_(2)SO_(4)(Ⅱ),which were obtained by introducing Sb^(3+)cation containing stereochemically active lone-pair(SCALP)and organicπ-conjugated cations into sulphate *** synergistic interactions of the organicπ-conjugated cations,the inorganic[SbO_(2)F_(2)]^(3-)seesaw anions and the[SO_(4)]^(2-)distorted tetrahedra anions make their ultraviolet(UV)absorption edges approach 297 and 283 nm,respectively,and raise their birefringence up to 0.193@546 nm and 0.179@546 nm,***,although the two compounds have the same stoichiometric ratio and similar one-dimensional(1D)chain structure,they show opposite macroscopic symmetry,where the NCS compound(Ⅱ)exhibits a large secondharmonic generation(SHG)response(1.6 times that of KH_(2)PO_(4)).The two reported compounds are found to be promising UV optical materials in the experimental tests.

关键词： Antimony-based crystals Cation-anion synergetic interactions Large birefringence Short UV absorption edge Organic-inorganic hybrid Ionothermal synthesis

Advances in the study of mitophagy in osteoarthritis

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第3期25卷 197-211页

作者： Hong cao Xuchang ZHOU Bowen XU Han HU Jianming GUO Miao WANG Nan LI Jun zou Department of Sport Rehabilitation Shanghai University of SportShanghai 200438China National Key Laboratory of Immunity and Inflammation Naval Medical UniversityShanghai 200433China School of Sport Medicine and Rehabilitation Beijing Sport UniversityBeijing 100084China

Osteoarthritis(OA),characterized by cartilage degeneration,synovial inflammation,and subchondral bone remodeling,is among the most common musculoskeletal disorders globally in people over 60 years of *** initiation and progression of OA involves the abnormal metabolism of chondrocytes as an important pathogenic *** degeneration features mitochondrial dysfunction as one of the important causative factors of abnormal chondrocyte ***,maintaining mitochondrial homeostasis is an important strategy to mitigate *** is a vital process for autophagosomes to target,engulf,and remove damaged and dysfunctional mitochondria,thereby maintaining mitochondrial *** studies have revealed a strong association between mitophagy and OA,suggesting that the regulation of mitophagy may be a novel therapeutic direction for *** reviewing the literature on mitophagy and OA published in recent years,this paper elaborates the potential mechanism of mitophagy regulating OA,thus providing a theoretical basis for studies related to mitophagy to develop new treatment options for OA.

关键词： Mitophagy Osteoarthritis Chondrocyte Mitochondria Apoptosis

Multi-omics integration reveals potential stage-specific druggable targets in T-cell acute lymphoblastic leukemia

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Genes & Diseases 2024年第5期11卷 374-389页

作者： Zijun Yan Jie Xia Ziyang cao Hongyang Zhang Jinxia Wang Tienan Feng Yi Shu Lin zou Clinical Research Unit Shanghai Children’s HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200062China Institute of Pediatric Infection Immunityand Critical Care MedicineShanghai Jiao Tong University School of MedicineShanghai 200062China Center for Clinical Molecular Laboratory Medicine of Children’s Hospital of Chongqing Medical University Chongqing 400014China Clinical Research Institute Shanghai Jiao Tong University School of MedicineShanghai 200025China Bioinformatics and BioMedical Bigdata Mining Laboratory School of Big HealthGuizhou Medical UniversityGuiyangGuizhou 554300China

T-cell acute lymphoblastic leukemia(T-ALL),a heterogeneous hematological malignancy,is caused by the developmental arrest of normal T-cell *** development of targeted therapeutic regimens is impeded by poor knowledge of the stage-specific aberrances in this *** this study,we performed multi-omics integration analysis,which included mRNA expression,chromatin accessibility,and gene-dependency database analyses,to identify potential stage-specific druggable targets and repositioned drugs for this *** multi-omics integration helped identify 29 potential pathological genes for *** genes exhibited tissue-specific expression profiles and were enriched in the cell cycle,hematopoietic stem cell differentiation,and the AMPK signaling *** these,four known druggable targets(CDK6,TUBA1A,TUBB,and TYMS)showed dysregulated and stage-specific expression in malignant T cells and may serve as stage-specific targets in *** TUBA1A expression level was higher in the early T cell precursor(ETP)-ALL cells,while TUBB and TYMS were mainly highly expressed in malignant T cells arrested at the CD4 and CD8 double-positive or single-positive ***6 exhibited a U-shaped expression pattern in malignant T cells along the naıve to maturation ***,mebendazole and gemcitabine,which target TUBA1A and TYMS,respectively,exerted stage-specific inhibitory effects on T-ALL cell lines,indicating their potential stage-specific antileukemic role in ***,our findings might aid in identifying potential stage-specific druggable targets and are promising for achieving more precise therapeutic strategies for T-ALL.

关键词： Multi-omics Stage-specific druggable targets Targeted therapeutic strategies T-cell acute lymphoblastic leukemia Drug repositioning