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Evolution mechanism and quantitative characterization of initial micro-cracks in marble under triaxial compression

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第7期25卷 586-595页

作者： Zhiliang wang Songyu LI Jianguo wang Ao LI weixiang wang Chenchen FENG Jingjing FU School of Civil Engineering Hefei University of TechnologyHefei230009China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou221116China

The initial micro-cracks affect the evolution characteristics of macroscopic deformation and failure of rock but are often ignored in theoretical calculation,numerical simulation,and mechanical *** this study,we propose a quantitative analysis model to investigate the effects of initial micro-cracks on the evolution of marble deformation and *** relationship between the micro-crack propagation and the marble failure characteristics was comprehensively studied by combining theoretical analysis with a micro-computed tomography(micro-CT)scanning *** found that with the increase of confining pressure,the matrix elastic modulus of the marble first increased and then tended to be stable,while the micro-cracks increased *** sensitivity ranges of the marble sample matrix elastic modulus and micro-cracks to confining pressure were 0–30 MPa and 30–50 MPa,*** porosity and Poisson’s ratio decreased *** increasing proportion of internal micro-cracks led to an increase in the sample *** samples presented mainly shear failure under triaxial compression,and the failure angle decreased linearly with the increase of confining *** convergence direction of cracks decreased *** quantitative analysis model could accurately portray the relationship between the overall macroscopic deformation and the deviatoric stress of the samples at the compaction and the linear elastic stages,thus deepening the understanding of the stress–strain behavior of rocks.

关键词： Marble Initial micro-cracks Triaxial compression Constitutive relationship Crack evolution

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Osmopriming-Regulated Changes of Plasma Membrane Composition and Function were Inhibited by Phenylarsine Oxide in Soybean Seeds

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Journal of Integrative Plant Biology 2009年第9期51卷 858-867页

作者： Jiajin Zhuo weixiang wang Yun Lu Wu Sen Xiaofeng wang Key Laboratory for Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of Education Beijing Forestry University Beijing 100083 China School of Bioengineering Xihua University Chengdu 610039 China

The aim of the present work was to investigate the effects of osmoconditioning on chilling injury in chilling-sensitive soybean （Glycine max （L.） Merr. Zhonghuang No. 22） seeds during imbibition. Low temperatures reduced the germination rate and no seed germinated at 1 ℃. Osmoconditioning of seeds at 20℃ with a polyethylene glycol-8000 （PEG8000） solution at 1.5 MPa for 72 h followed by drying back to their initial moisture content （MC） reduced their chilling sensitivity. The phenylarsine oxide （PAO）, an inhibitor of protein tyrosinephosphatases, was used to investigate the possible involvement of phosphorylation-dephosphorylation of Tyr residues in the plasma membrane composition and function when seeds were osmoconditioned. The results showed the germination of osmoconditioned seeds decreased significantly when PAO was added in PEG solution after chilling treatment. PAO inhibited changes in composition of plasma membrane phospholipids and fatty acid induced by osmocondition, indicated that tyrosine protein phosphorylation is involved in the regulatory mechanisms of osmocondition-responsive chilling in soybean seeds. Western blot result further indicated that osmocondition treatment improved the activity of plasma membrane H^＋-ATPase after chilling treatment, but this effect was abolished by PAO. The possible regulation mechanism by Tyr protein phosphorylation is discussed.

关键词： fatty acid membrane lipid osmoconditioning phenylarsine oxide protein-tyr phosphatases soybean seeds.

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Toxicity evaluation of collagen hydrolysates from chrome shavings and their potential use in the preparation of amino acid fertilizer for crop growth

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Journal of Leather Science and Engineering 2022年第1期4卷 14-36页

作者： Li Zhao Shengdong Mu weixiang wang Haibin Gu Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065China National Engineering Research Center of Clean Technology in Leather Industry Sichuan UniversityChengdu 610065China College of Food and Bioengineering Xihua UniversityChengdu 610039China.

Resource utilization of chrome shavings(CS)has attracted a lot of attention from scientists and technologists in leather ***,the collagen hydrolysates extracted from CS are expected to find potential application values in agricultural ***,there is no biotoxicity analysis of collagen hydrolysates from ***,the collagen hydrolysates with different molecular weights were produced from CS by three hydrolysis dechroming methods including alkaline hydrolysis,enzymatic hydrolysis and alkaline-enzymatic synergistic hydrolysis,and the optimal hydrolysis process of CS was designed and *** evaluate their toxicity,the three collagen hydrolysates were formulated into a nutrient solution for zebrafish *** obtained results indicated that the hydrolysates with low concentrations(less than 0.6 mg/mL)were safe and could promote the development for zebrafish ***,the three collagen hydrolysates were utilized as organic nitrogen sources and formulated into amino acid water-soluble fertilizers(AAWSF)including alkaline type fertilizer(OH),enzymatic type fertilizer(M)and alkaline-enzymatic type fertilizer(OH-M)for the early soilless seeding cultivation of wheat,soybean and *** is worth mentioning that the chromium contents in the prepared AAWSF were less than 10 mg/kg,which is far less than the limit value in the standard(China,50 mg/kg).The growth and development of seedlings(germination rate,plant height,fresh weight of leaves,soluble sugar content and chlorophyll content)were *** corresponding results showed that the growth of seedlings watered with AAWSF was better compared with the other treatments,and the OH-M fertilizer had the best promoting effect on the seedlings growth and development,followed by the M and OH *** safe toxicity assessment of the collagen hydrolysates will expand their application scope,and the use of collagen hydrolysates extracted from CS for seedlings growth als

关键词： Chrome shavings Collagen hydrolysate Zebrafish Toxicity evaluation Amino acid water-soluble fertilizer Seedling growth

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Determinants of uterine aging:lessons from rodent models

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Science China(Life Sciences) 2012年第8期55卷 687-693页

作者： KONG ShuangBo ZHANG Shuang CHEN YongJie wang weixiang wang BingYan CHEN Qi DUAN EnKui wang HaiBin State Key Laboratory of Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100039China

The uterus is an indispensable organ for the development of a new life in eutherian *** female mammalian reproductive capacity diminishes with *** this respect,the senescence of uterine endometrium is convinced to contribute to this *** review focuses on the physiological function of the uterus and the related influence of aging mainly in rodent models.A better understanding of the underlying mechanisms governing the process of uterine aging is hoped to generate new strategies to prolong the reproductive lifespan in humans.

关键词： determinants uterine aging rodent models

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Design of a new type of mine rescue relay cabin

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International Journal of Mining Science and Technology 2017年第4期27卷 711-715页

作者： Gao Na Chen Ruoyu Shen Jie Jin Longzhe Liu Jianguo Zhang Hao wang weixiang Fan Linyu School of Civil and Resource Engineering University of Science and Technology Beijing Beijing 100083 China

This paper presents the design of an innovative mine emergency rescue relay cabin, and investigates a detailed comparison of existing shelter facilities, their function, service object, structures, size, and system components with the newly designed mine emergency rescue relay cabin. Air-tightness test indicated a test chamber relief rate of 26 Pa/min, which meets the design requirements. Furthermore,respirator replacement test showed an average time of 73.7 s to replace a respirator. The air cover air supply test indicated an air supply rate of 220 L/min, which is sufficient for the staff replacing the respirator in the emergency rescue relay cabin. The total air supply volume is 9680 L, which can be supplied via two compressed air cylinders of 40 L, pressurized to15 MPa.

关键词： Relay cabin site selection System and structure Air tightness Air cover air supply

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The Hardness Properties of Carbon Steels After Laser Processing

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Chinese Journal of Lasers 1994年第1期B3卷 91-95页

作者： ZHU Zuchang wang weixiang LI Xiuqian YU Shaoluo(Shanghai University of Engineering Science,Shanghai 200335, China) Shanghai Univ of Engineering Science Shanghai China

ＴｈｅＨａｒｄｎｅｓｓＰｒｏｐｅｒｔｉｅｓｏｆＣａｒｂｏｎＳｔｅｅｌｓＡｆｔｅｒＬａｓｅｒＰｒｏｃｅｓｓｉｎｇ￥ＺＨＵＺｕｃｈａｎｇ；ＷＡＮＧＷｅｉｘｉａｎｇ；ＬＩＸｉｕｑｉａｎ；ＹＵＳｈａｏｌｕｏ（Ｓｈａｎｇｈａｉ... 详细信息

ＴｈｅＨａｒｄｎｅｓｓＰｒｏｐｅｒｔｉｅｓｏｆＣａｒｂｏｎＳｔｅｅｌｓＡｆｔｅｒＬａｓｅｒＰｒｏｃｅｓｓｉｎｇ￥ＺＨＵＺｕｃｈａｎｇ；ＷＡＮＧＷｅｉｘｉａｎｇ；ＬＩＸｉｕｑｉａｎ；ＹＵＳｈａｏｌｕｏ（ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙｏｆＥｎｇｉｎ...

关键词： laser processing heat treatment property

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Isolation,purification and characterization of secondary structure of antifreeze protein from Ammopiptanthus mongo-licus

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Chinese Science Bulletin 2001年第6期46卷 495-498页

作者： FEI Yunbiao WEI Lingbo GAO Suqin LU Manchun wang Baohuai LI Zhifen ZHANG Youming SHU Nianhong JIANG Yong wang weixiang Institute of Developmental Biology Chinese Academy of SciencesBeijing 100080China Institute of Physical Chemistry Peking UniversityBeijing 100871China

Antifreeze protein (AFP) from Ammopiptanthus mongolicus leaves was isolated and purified with DEAE cellulose 52, Sephacryl 300, heat treatment and preparative isotachophoresis. The molecular weight of AFP was 50 ku by SDS-PAGE measurement. The average thermal hysteresis activity (THA) of AFP was 0.35℃ at 5 mg/mL using a differential scanning calorimeter (DSC). This AFP showed heated stability. From circular dichroism (CD) of AFP spectral data from 195-240 nm, a well-defined secondary structure of 11% a-helix, 34% antiparallel β-sheet and 55% random coil for the plant AFP was deduced.

关键词： Ammopiptanthus mongolicus AFP THA DSC CD.

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基于表面细分技术的边界谱方法

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西北工业大学学报 2005年第6期23卷 720-724页

作者：文立华王卫祥西北工业大学航天学院陕西西安710072

把表面细分技术与边界谱方法相结合,提出了一种基于表面细分技术的子波边界谱方法。它能精确描述复杂图形边界,提高处理复杂边界问题的能力和计算精度,把表面细分技术建立的几何模型直接用于边界谱方法的求解。数值算例表明,该方法是有... 详细信息

把表面细分技术与边界谱方法相结合,提出了一种基于表面细分技术的子波边界谱方法。它能精确描述复杂图形边界,提高处理复杂边界问题的能力和计算精度,把表面细分技术建立的几何模型直接用于边界谱方法的求解。数值算例表明,该方法是有效的。

关键词：表面细分子波边界谱方法声学

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Etiological characteristics of influenza-like illness in Jiangsu province from 2012 to 2016

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The Journal of Biomedical Research 2019年第6期33卷 398-407页

作者： Ke Xu Xiang Huo Rongqiang Zu Shenjiao wang Yuanfang Qin Qigang Dai Xian Qi Huiyan Yu Lilin Chen Lei Hong Yangting Xu Qianhua Yi weixiang wang Xuan wang Wenjun Dai Jie Zha Weining Han Changjun Bao Department of Acute Infectious Disease Control and Prevention Jiangsu Provincial Center for Disease Control and PreventionNanjingJiangsu 210009China Department of Acute Infectious Disease Control and Prevention Suzhou Municipal Center for Disease Control and PreventionSuzhouJiangsu 215004China Department of Acute Infectious Disease Control and Prevention Nanjing Municipal Center for Disease Control and PreventionNanjingJiangsu 210003China Department of Acute Infectious Disease Control and Prevention Taizhou Municipal Center for Disease Control and PreventionTaizhouJiangsu 225300China

Influenza-like illness(ILI)is an acute respiratory infection caused by various ***,the epidemiologic characteristics of ILI pathogens in Jiangsu province are *** better understand the ILI etiology,the characteristics of the pathogens from nasopharyngeal swab samples of patients with ILI collected from 2012 to 2016 in 6 hospitals in Jiangsu province were *** pathogens,including influenza virus,respiratory syncytial virus(RSV),rhinovirus(HRV),adenovirus(ADV),herpes simplex virus(HSV),human coronavirus(hCoV),Streptococcus pneumoniae and Haemophilus influenzae,were detected by real-time *** least one pathogen was identified in 1334 of the patients(40.23%).Among viruses,HRV,influenza A virus(Flu A),ADV and RSV were the most frequently *** was the only pathogen that was distributed evenly in different years and regions(P>0.05).The etiological distribution varied in different age *** pneumoniae was the most common pathogen in co-infections with a co-detection rate of 64.57%(319/494).The spectrum of etiologies could help to estimate disease burden and provide guidance for vaccination.

关键词： influenza-like illness pathogens co-infection distribution

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Laser-induced Chemical VaporDeposited Nanosized Silicon Nitridewith Double Optical Beams

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Chinese Journal of Lasers 1996年第1期B5卷 67-71页

作者： wang weixiang (Institute of Quantum Electronices, South china Normal Unicersity, Guangzhou 510631, China International Centre for Materials Physics, Academia Sinica, Shenyang, 110015, China)LIU Songhao(Institute of Quantum Electronices, South china Normal South China Normal Univ Guangzhou China

It was studied that how the CO2laser lines affect the characteristics of silicon nitride powders synthesized by laser-induced chemical vapor deposition （LICVD）. A new method was proposed for nanosized silicon nitride synthesis, and it is called double optical beam LICVD. The stoichiometric silicon nitride nanopowders with high purity were produced by using this new method. The ratio of N/Si of the powder is as high as 1. 321 which is very close to the ideal value of 1. 333.

关键词： laser-induced chemical vapor deposition nanosized silicon nitride

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