检索结果-南通市图书馆

Corrosion resistance and mechanisms of smart micro-arc oxidation/epoxy resin coatings on AZ31 Mg alloy: Strategic positioning of nanocontainers

引用

Journal of Magnesium and Alloys 2023年第12期11卷 4562-4574页

作者： Ai-meng Zhang Chengbao Liu pu-sheng Sui Cong Sun Lan-yue Cui M.Bobby Kannan Rong-Chang Zeng College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China School of Engineering University of NewcastleCallaghanNew South Wales 2308Australia

Smart micro-arc oxidation(MAO)/epoxy resin(EP) composite coatings were formed on AZ31 magnesium(Mg) alloy. Mesoporous silica nanocontainers(MSN) encapsulated with sodium benzoate(SB) corrosion inhibitors were strategically incorporated in the MAO micropores and in the top EP layer. The influence of the strategic positioning of the nanocontainers on the corrosion protective performance of coating was investigated. The experimental results and analysis indicated that the superior corrosion resistance of the hybrid coating is ascribed to the protection mechanisms of the nanocontainers. This involves two phenomena:(1) the presence of the nanocontainers in the MAO micropores decreased the distance between MSN@SB and the substrate, demonstrating a low admittance value(^5.18 × 10^(-8)Ω^(-1)), and thus exhibiting significant corrosion inhibition and self-healing function;and(2) the addition of nanocontainers in the top EP layer densified the coating via sealing of the inherent defects, and hence the coating maintained higher resistance even after 90 days of immersion(1.13 × 10^(10)Ω cm^(2)).However, the possibility of corrosion inhibitors located away from the substrate transport to the substrate is reduced, reducing its effective utilization rate. This work demonstrates the importance of the positioning of nanocontainers in the coating for enhanced corrosion resistance,and thereby providing a novel perspective for the design of smart protective coatings through regulating the distribution of nanocontainers in the coatings.

关键词： Nanocontainers Self-healing coating Micro-arc oxidation Corrosion protection Magnesium alloys

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Environmental impact of radionuclide migration in groundwater from a low intermediate level radioactive waste repository

引用

Journal of Environmental Sciences 2001年第2期13卷 180-184页

作者： wang, Jin-sheng Yang, Zhi-feng Li, Shu-shen wang, Zhi-ming Institute of Environmental Sciences Beijing Normal UniversityState Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing 100875 China China Institute for Radiation Protection Taiyuan 030006 China

The radionuclide migration from a certain Chinese repository with low-intermediate level radioactive solid waste is studied. The migration in groundwater is analyzed and computed in detail. Under presumption of normal releasing, or the bottom of the repository has been marinated for one month with precipitation reaching 600 mm once and a 6 m aerated zone exists, a prediction for 7 radionuclides is conducted. It shows that the aerated zone is the primary barrier for migration. The migration for radionuclides 60Co, 137Cs, 90Sr, 63Ni, etc. will be retarded in it within 500 years. The concentration of 239pu will be decreased by amount of 6 order. Only 3H and 14C can migrate through the aerated zone. The radionuclides that go through the aerated zone and enter the aquifer will exist in spring, stream and sea. Based on this, the intake dose by residents in different age group resulting from drinking contaminated spring water, eating seafood is calculated. The results showed that the impact of the repository to the key resident group is lower than the limit in national repository regulation standard. This complies with the repository management target.

关键词： intermediate level radioactive waste repository Environmental impact of radionuclide migration in groundwater from a low

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Emergency adult living donor right lobe liver transplantation for fulminant hepatic failure

引用

Frontiers of Medicine 2007年第3期1卷 282-286页

作者： ZHANG Feng wang Xuehao LI Xiangcheng KONG Lianbao SUN Beicheng LI Guoqiang QIAN Xiaofen CHEN Feng wang Ke LU sheng pu Liyong LU Ling Key Laboratory of Living Donor Liver Transplantation of Ministry of public Health Liver Transplantation Centerthe First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029China

Fulminant hepatitis is fatal in most cases and timely liver transplantation is the only effective *** study evaluates the survival outcomes of patients who underwent living-donor liver transplantation(LDLT)using right lobe liver grafts for fulminant liver failure due to hepatitis B *** cases of adult right lobe LDLT were performed in our department from September 2002 to August 2005 and the clinical and following-up data were *** to the pre-transplant Child-pugh-Turcotte classification,the nine patients were classified as grade *** model for end-stage liver disease(MELD)score of these patients ranged from 16 to *** principal complications before transplantation included abnormal renal function,hepatic coma of different degrees and alimentary tract *** main complications after transplantation included pulmonary infection in two cases,acute renal failure in three cases and transplantation-related encephalopathy in one *** primary failure of vascular or biliary complications *** one-year survival rate was 55.6%.There were no serious complications or deaths in *** general,it is extremely difficult to treat fulminant hepatitis by conservative regimen,particularly,in cases with rapid *** adult living-donor liver transplantation is an effective treatment for fulminant hepatitis patients and is relatively safe for donors.

关键词： liver transplantation living donors hepatitis,liver disease

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Role of PERK/eIF2α/CHOP Endoplasmic Reticulum Stress Pathway in Oxidized Low-density Lipoprotein Mediated Induction of Endothelial Apoptosis

引用

Biomedical and Environmental Sciences 2016年第12期29卷 868-876页

作者： TAO Yong Kang YU pu Lin BAI Yong Ping YAN sheng Tao ZHAO Shui Ping ZHANG Guo Qiang Departments of Emergency China-Japan Friendship HospitalBeijing 100029China Beijing Institution of Geriatrics Beijing HospitalBeijing 100730China Department of Geriatric Medicine Xiangya HospitalCentral South UniversityChangsha 410008HunanChina Department of Cardiology The Second Xiangya HospitalCentral South UniversityChangsha 410011HunanChina

Objective PERK/elF2/CHOP is a major signaling pathway mediating endoplasmic reticulum （ER） stress related with atherosclerosis. Oxidized LDL （ox-LDL） also induces endothelial apoptosis and plays a vital role in the initiation and progression of atherosclerosis. The present study was conducted to explore the regulatory effect of ox-LDL on PERK/elF2a/CHOP signaling pathway in vascular endothelial cells. Methods The effects of ox-LDL on PERK and p-elF2a protein expression of primary human umbilical vein endothelial cells （HUVECs） were investigated by Western blot analysis. PERK gene silencing and selective elF2a phosphatase inhibitor, salubrinal were used to inhibit the process of ox-LDL induced endothelial cell apoptosis, caspase-3 activity, and CHOP mRNA level. Results Ox-LDL treatment significantly increased the expression of PERK, PERK-mediated inactivation of elF2a phosphorylation, and the expression of CHOP, as well as the caspase-3 activity and apoptosis. The effects of ox-LDL were markedly decreased by knocking down PERK with stable transduction of lentiviral shRNA or by selective elF2a phosphatase inhibitor, salubrinal. Conclusion This study provides the first evidence that ox-LDL induces apoptosis in vascular endothelial cells mediated largely via the PERK/elF2a/CHOP ER-stress pathway. It adds new insights into the molecular mechanisms underlying the pathogenesis and progression of atherosclerosis.

关键词： PERK elF2a CHOP Endoplasmic reticulum stress Oxidized low-density lipoprotein Endothelial cell Apoptosis Atherosclerosis Caspase-3

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Measurements of absolute electron capture cross sections in He^(2+)–He and Ne^(8+)–O_(2'), N_(2'), CH_4 collisions

引用

Nuclear Science and Techniques 2023年第10期34卷 126-135页

作者： pu-Fang Ma Jia-Rong wang Zi-Xiao Zhang Tian-Ming Meng Zi-Han Xia Bai-Hui Ren Long Wei Ke Yao Jun Xiao Ya-Ming Zou Bing-sheng Tu Bao-Ren Wei Institute of Modern Physics Department of Nuclear Science and TechnologyFudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Fudan UniversityShanghai 200433China

The total absolute cross sections of single-and double-electron capture (SEC and DEC) in the collisions of He^(2+)with He and Ne^(8+)with O_(2),N_(2),and CH_(4) were studied in the energy ranges 3.5–50 keV/u and 2.8–40 keV/u,*** a deep analysis of the experimental systematic uncertainties in the measurement procedure and data evaluation,the error in the experimental results of the SEC cross sections is less than 9%.Within the uncertainties,the present results of the He^(2+)–He collision show good consistency with previous measurements,validating the experimental system and paving the way for precise measurements of EC cross sections for a variety of ions and neutral *** present measurements allow for a test of EC theory and provide crucial EC cross section data for the establishment of plasma models in fusion research and astrophysical X-ray studies.

关键词： Highly charged ions Cross section Electron capture Charge exchange

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Expression of ornithine decarboxylase in precancerous and cancerous gastric lesions

引用

World Journal of Gastroenterology 2007年第20期13卷 2867-2871页

作者： Xin-pu Miao Jian-sheng Li Hui-Yan Li Shi-Ping Zeng Ye Zhao Jiang-Zheng Zeng Department of Gastroenterology the Affiliated Hospital of Hainan Medical College Haikou 570102 Hainan Province China Department of Gastroenterology the First Affiliated Hospital of Zhengzhou University Zhengzhou 450052 Henan Province China Department of Chemotherapy for Cancer West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China Department of Cancer the Affiliated Hospital of Hainan Medical College 31 Longhua Avenue Haikou 570102 Hainan Province China

AIM: To investigate the expression of ornithine decarboxylase (ODC) in precancerous and cancerous gastric lesions. METHODS: We studied the expression of ODC in gastric mucosa from patients with chronic superficial gastritis (CSG,n = 32),chronic atrophic gastritis CAG,n = 43; 15 with and 28 without intestinal metaplasia (IM),gastric dysplasia (DYS,n = 11) and gastric cancer (GC,n = 48) tissues using immunohistochemical staining. All 134 biopsy specimens of gastric mucosa were collected by gastroscopy. METHODS: The positive rate of ODC expression was 34.4%,42.9%,73.3%,81.8% and 91.7% in cases with CSG,CAG without IM,CAG with IM,DYS and GC,respectively (P < 0.01),The positive rate of ODC expression increased in the order of CSG < CAG (without IM) < CAG (with IM) < DYS and finally,GC. In addition,ODC positive immunostaining rate was lower in well-differentiated GC than in poorly-differentiated GC (P < 0.05). CONCLUSION: The expression of ODC is positively correlated with the degree of malignity of gastric mucosa and development of gastric lesions. This finding indicates that ODC may be used as a good biomarker in the screening and diagnosis of precancerous lesions.

关键词： Ornithine decarboxylase Gastric carcinoma Precancerous lesions Diagnosis Immunohistochemistry

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A new lipophilic monosaccharide from Erigeron annuus

引用

Chinese Chemical Letters 2008年第10期19卷 1231-1233页

作者： sheng Chao Yang Jian Xin pu Ying Lu Feng Hui Xiao Wei Lie Xiao Han Dong Sun Institute of Chinese Medicinal Materials of Yunnan Agricultural University and Yunnan Provincial Center of Chinese Medicinal Materials＇ GAP Technology Kunming 650201 China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

A new lipophilic monosaccharide, erigearide A （1）, was isolated from the aerial parts of Erigeron annuus （Lima.） Pers. Its structure was elucidated by analysis of spectroscopic evidence.

关键词： Erigeron annuus Lipophilic monosaccharide Erigearide A

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nitrogen application regulates antioxidant capacity and flavonoid metabolism,especially quercetin,in grape seedlings under salt stress

引用

Journal of Integrative Agriculture 2024年第12期23卷 4074-4092页

作者： Congcong Zhang Han wang Guojie Nai Lei Ma Xu Lu Haokai Yan Meishuang Gong YuanyuanLi Ying Lai Zhihui pu Li Wei Guiping Chen Ping Sun Baihong Chen Shaoying Ma sheng Li College of Horticulture Gansu Agricultural UniversityLanzhou 730070China College of Life Science and Technology Gansu Agricultural UniversityLanzhou 730070China College of Agronomy Gansu Agricultural UniversityLanzhou 730070China Laboratory and Practice Base Management Center Gansu Agricultural UniversityLanzhou 730070China State Key Laboratory of Aridland Crop Science Gansu Agricultural UniversityLanzhou 730070China

Salt stress is a typical abiotic stress in plants that causes slow growth,stunting,and reduced yield and fruit *** is necessary to ensure proper crop ***,the effect of fertilization on salt tolerance in grapevine is *** this study,we investigated the effect of nitrogen fertilizer(0.01 and 0.1 mol L^(-1)NH_(4)NO_(3))application on the salt(200 mmol L^(-1)NaCl)tolerance of grapevine based on physiological indices,and transcriptomic and metabolomic *** results revealed that 0.01 mol L^(-1)NH_(4)NO_(3) supplementation significantly reduced the accumulation of superoxide anion(O_(2)^(-)·),enhanced the activities of superoxide dismutase(SOD)and peroxidase(POD),and improved the levels of ascorbic acid(AsA)and glutathione(GSH)in grape leaves compared to salt treatment ***,joint transcriptome and metabolome analyses showed that the differentially expressed genes(DEGs)and differentially accumulated metabolites(DAMs)were significantly enriched in the flavonoid biosynthesis pathway(ko00941)and the flavone and flavonol biosynthesis pathway(ko00944).In particular,the relative content of quercetin(C00389)was markedly regulated by salt and *** analysis revealed that exogenous foliar application of quercetin improved the SOD and POD activities,increased the AsA and GSH contents,and reduced the H_(2)O_(2) and O_(2)^(-)·***,10 hub DEGs,which had high Pearson correlations(R^(2)>0.9)with quercetin,were repressed by *** conclusion,all the results indicated that moderate nitrogen and quercetin application under salt stress enhanced the antioxidant system defense response,thus providing a new perspective for improving salt tolerance in grapes.

关键词： grapevine salt stress nitrogen multi-omics quercetin antioxidant

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Projection and Contraction Methods for Nonlinear Complementarity Problem

引用

Wuhan University Journal of Natural Sciences 2000年第4期5卷 391-396页

作者： Zhao She-feng, Fei pu-sheng College of Mathematics and Computer Science,Wuhan University,Wuhan 430072,China College of Mathematics and Computer Science Wuhan University Wuhan China

We applied the projection and contraction method to nonlinear complementarity problem (NCP). Moveover, we proposed an inexact implicit method for (NCP) and proved the convergence.

关键词： nonlinear complementarity problem projection and contraction method implicit method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Primal-Dual Infeasible-Interior-Point Algorithm for Multiple Objective Linear Programming Problems

引用

Wuhan University Journal of Natural Sciences 2005年第2期10卷 351-354页

作者： HUANGHui FEIpu-sheng YUANYuan SchoolofMathematicsandStatistics.WuhanUnivcrsity Wuhan430072HubeiChina

A primal-dual infeasible interior point algorithm for multiple objective linear programming (MOLP) problems was presented. In contrast to the current MOLP algorithm. moving through the interior of polytope but not confining the iterates within the feasible region in our proposed algorithm result in a solution approach that is quite different and less sensitive to problem size, so providing the potential to dramatically improve the practical computation effectiveness.

关键词： Key words multiple objective linear programming primal dual infeasible interior point algorithm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：