检索结果-南通市图书馆

The corrosion characteristics and mechanism of directionally solidified Mg-3Zn-xCa alloys

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

Journal of Magnesium and Alloys 2023年第10期11卷 3673-3687页

作者： Yi Zhang Xiaohui Feng Qiuyan Huang Yingju Li Xuehui Hao changzheng wang Yuansheng Yang Institute of Metal Research Chinese Academy of Scienceswenhua road 72Shenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China

An investigation into the corrosion characteristics and mechanism of directionally solidified(DSed) Mg-3Zn-xCa(x = 0, 0.2, 0.5,0.8 wt.%) alloys in 0.9 wt.% Na Cl solution is presented. The DSed microstructure consists of columnar dendrites and eutectics distributed in the interdendritic region. The primary dendritic arm spacing(PDAS) and the volume fraction(fv) of the secondary phases are under the significant impact of the content of Ca. The corrosion rates evaluated using electrochemical measurements and immersion tests are accelerated monotonously with the increase of Ca content in DSed alloys. The corrosion resistance of the DSed alloys is significantly affected by the corrosion products film(CPF) and the secondary phases. The corrosion products of DSed Mg-3Zn alloy contain Mg(OH)_(2) and ZnO. The existence of ZnO greatly enhances the corrosion resistance of DSed Mg-3Zn alloy. As for the DSed alloys containing Ca content, a relatively protective CPF without deep pits can form on the surface of DSed Mg-3Zn-0.2Ca specimen during the corrosion. The f_(v)of the secondary phases dominates the corrosion rate of the DSed Mg-Zn-Ca alloys. The corrosion of DSed Mg-3Zn-xCa alloys initiates as a result of microgalvanic coupling between the cathodes of secondary phases and α-Mg matrix anode. Then, the corrosion gradually extends longitudinally with the breakdown of CPF.

关键词： Mg-Zn-Ca alloy Directional solidification Electrochemical characterization Corrosion mechanism

Photocatalytic fuel cell for simultaneous antibiotic wastewater treatment and electricity production by anatase TiO_(2) nanoparticles anchored on Ni foam

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第2期34卷 311-316页

作者： Jinhan Li Xicheng Li Shaobin Yu Shuai Gao Yang Zhang Yan Li changzheng wang Qiang wang Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation Beijing University of Civil Engineering and ArchitectureBeijing 100044China College of Chemistry Beijing Normal UniversityBeijing 100875China Laboratory for Micro-sized Functional Materials&College of Elementary Education Capital Normal UniversityBeijing 100048China

Photocatalytic fuel cell (PFC) holds great potential for the sustainable production of electricity and degradation of organic pollutants for solving global energy and environmental ***,the efficient photodegradation of organic dyes and antibiotic drugs,such as ciprofloxacin (CIP) and methylene blue(MB),remains *** at improving the separation efficiency of hole and electron for electricity generation in the PFC system,TiO_(2)-NPs@NF-x photoanode was fabricated by a cost-effective and laborsaving hydrothermal *** as-fabricated photoanode demonstrated abundant active sites,enhanced light harvesting capacity and photogenerated charge carrier *** a CIP-HCl concentration of 10 mg/L and p H value of about 7,85%of CIP-HCl can be efficiently removed after 3 h irradiation by 300 W Xe ***_(2)-NPs@NF-20 photoelectrode based PFC system exhibited an impressed ability to simultaneously degrade ciprofloxacin and generate electricity under light irradiation with an open circuit voltage of 1.021 V,short circuit current density and maximum power density of 2.4 mA/cm^(2),0.357 mW/cm^(2),*** work provided a cost-effective method for the treatment of organic waste and generation of electrical power.

关键词： Photocatalytic fuel cell TiO_(2) Ni foam Electricity production Antibiotic wastewater treatment

儿童新型冠状病毒感染并发纵隔气肿八例影像学及临床特点研究

在线全文

学校读者我要写书评

暂无评论

中国全科医学 2025年第4期28卷 510-515页

作者：付强任作雷林志强龚剑峰王长征王婷胡雅兰谭举方长江大学附属荆州医院儿科湖北省荆州市434020 长江大学附属荆州医院病案统计科湖北省荆州市434020 长江大学附属荆州医院公共卫生科湖北省荆州市434020 长江大学附属荆州医院放射科湖北省荆州市434020 长江大学附属荆州医院检验科湖北省荆州市434020

背景儿童新型冠状病毒感染(COVID-19)影像学与成人有一定差异,主要表现为胸膜下磨玻璃影、斑片状高密度影、实变影等,合并纵隔气肿者并不多见。大量气肿形成可严重影响呼吸及循环功能,导致明显喘憋、低氧血症,需积极处理。目的分析并总... 详细信息

背景儿童新型冠状病毒感染(COVID-19)影像学与成人有一定差异,主要表现为胸膜下磨玻璃影、斑片状高密度影、实变影等,合并纵隔气肿者并不多见。大量气肿形成可严重影响呼吸及循环功能,导致明显喘憋、低氧血症,需积极处理。目的分析并总结儿童COVID-19并发纵隔气肿的影像学及临床特征。方法回顾分析2022-12-01—2023-01-30在长江大学附属荆州医院儿科住院的8例COVID-19并发纵隔气肿的患儿年龄、性别、影像学、临床特点及诊疗情况。结果8例患儿年龄3岁7个月~12岁,男女比3∶5,高分辨率CT(HRCT)均显示双肺感染合并纵隔气肿。气肿多同时累及颈部及胸壁。肺部表现多种多样:胸膜下磨玻璃影、实变、树芽征、支气管血管束增粗、支气管壁增厚及网格征等,未见大片实变及“白肺”。1例患儿合并少量胸腔积液。临床表现除有发热、咳嗽外,均有明显气促,肺部听诊干湿啰音可不显著。4例合并肺炎支原体感染、1例合并卡他布兰汉菌感染。合并肺炎支原体感染者应用阿奇霉素,合并卡他布兰汉菌感染者给予头孢噻肟治疗。8例患儿均给予氧疗。1例患儿白细胞总数及超敏C反应蛋白明显升高,明显气急,低氧血症,常规治疗无好转,给予有创呼吸机治疗3d后好转撤机。5例应用静脉丙种球蛋白(IVIG),3例使用糖皮质激素。1周后复查胸部CT,纵隔气肿均完全吸收,肺部病灶明显好转。结论COVID-19并发纵隔气肿者多为学龄前期或学龄期儿童,婴幼儿少见。可同时合并颈部及胸壁积气。肺部病变可累及间质或实质、双肺均受累,表现形式多样。起病多有明显气急,积极氧疗。白细胞计数明显升高,同时超敏C反应蛋白明显升高者,要密切关注呼吸情况,积极使用IVIG,适时适量应用糖皮质激素,必要时采用呼吸机人工辅助通气。

关键词：新型冠状病毒感染纵隔气肿临床特征体层摄影术,螺旋计算机儿童

Silver nanocubes monolayers as a SERS substrate for quantitative analysis

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第4期32卷 1497-1501页

作者： Ziang Zhou Xiuhui Bai Peishen Li changzheng wang Ming Guo Yang Zhang Peiren Ding Shaowei Chen Yunyun Wu Qiang wang Laboratory for Micro-sized Functional Materials College of Elementary Education and Department of ChemistryCapital Normal UniversityBeijing 100048China School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation Beijing University of Civil Engineering and ArchitectureBeijing 100044China College of Chemistry Beijing Normal UniversityBeijing 100875China Department of Chemistry and Biochemistry University of CaliforniaSanta CruzUnited States

Surface-enhanced Raman scattering(SERS)is a powerful spectroscopic tool in quantitative analysis of molecules,where the substrate plays a critical role in determining the detection ***,a silver nanocubes/polyelectrolyte/gold film sandwich structure was prepared as a reproducible,highperformance SERS substrate by the wate r/oil inte rfacial assembly *** addition to the hot spots on the nanocubes surface,the edge-to-edge interspace of the Ag nanocubes led to marked enhancement of the SERS intensity,with a limit of detection of 10~(11)mol/L and limit of quantitation of 10~(10)mol/L for crystal *** rhodamine 6 G and crystal violet were co-adsorbed on the Ag nanocube surfaces,the characteristic SERS peaks of the two molecules remained well resolved and separated,and the peak intensities varied with the respective concentration,which could be exploited for concurrent detection of dual *** from this work indicate that organized ensembles of Ag nanocubes can serve as effective SERS substrate can for sensitive analysis for complex molecular systems.

关键词： Silver nanocube Surface enhanced raman scattering Quantitative analysis Rhodamine 6G Crystal violet

MXR7 facilitates liver cancer metastasis via epithelial-mesenchymal transition

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2017年第11期60卷 1203-1213页

作者： guishuai lv yexiong tan hongwei lv tian fang changzheng wang ting li yanting yu congli hu wen wen hongyang wang wen yang international cooperation laboratory on signal transduction eastern hepatobiliary surgery institutesecond military medical universityShanghai 200438China national center for liver cancer Shanghai 201805China state key laboratory of oncogenes and related genes shanghai cancer institute renji hospitalshanghai jiaotong university school of medicineShanghai 200127China

MXR7 is a cell-surface protein and highly expressed in hepatocellular carcinoma(HCC). The aim of this study is to determine the expression profile of MXR7 in HCC and investigate the influence of MXR7 on invasion and metastasis of HCC cells. For this purpose, immunohistochemical assay was used to identify the differential expression of MXR7 in 94 HCC specimens. Expression of MXR7 in 4 pairs of HCC and portal vein tumor thrombus(PVTT) was also tested. The motility of HCC cells were characterized by transwell migration and matrigel invasion assays. In vivo metastasis potential was determined via tail vein injection ***, compared with noninvasive HCC tumors or human HCC cell lines with low metastatic potential, invasive HCC samples and HCC cell lines with high metastatic potential exhibited higher MXR7 expression. Furthermore, forced expression of MXR7 in SMMC-7721 promoted cell proliferation, migration and invasion in vitro and accelerated tumor growth and metastasis in vivo. Conversely, knockdown of MXR7 expression in HuH7 cells inhibited proliferation and motility of cells. Mechanically,overexpression of MXR7 promoted epithelial-mesenchymal transition(EMT) progress, and MXR7 depletion repressed the EMT phenotype. In conclusion, MXR7 is a mediator of EMT and metastasis in HCC and may serve as a novel therapeutic target.

关键词： hepatocellular carcinoma(HCC) MXR7 metastasis epithelial-mesenchymal transition(EMT)

Retina cell atlases of multiple species and an online platform for retina cell-type markers

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2022年第3期49卷 262-265页

作者： Zaoxu Xu changzheng wang Min Chen Yuting Yuan Linzhou Li Zhen Huang Yue Yuan Huanming Yang Qi wang Xingliang Zhang College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China BGI-Shenzhen ShenzhenGuangdong 518083China Department of Computer Science City University of Hong KongHong Kong 999077China Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua UniversityShenzhenGuangdong 518055China Department of Physiology School of Basic Medical SciencesBinzhou Medical UniversityYantaiShandong 264003China Fujian Key Laboratory of Developmental and Neural Biology College of Life SciencesFujian Normal UniversityFuzhouFujian 350117China Cuiying Biomedical Research Center Lanzhou University Second HospitalLanzhouGansu 730010China Institute of Pediatrics Department of Pediatric SurgeryShenzhen Children's HospitalShenzhenGuangdong 51803&China Department of Pediatrics The Affiliated Hospital of Guangdong Medical UniversityZhanjiangGuangdong 524001China

The retina is a complex visual tissue that perceives light signals because of an exquisite orchestration of high cellular complexity(Fig. 1A). It is of great significance to explore the transcriptome diversity of each cell type for comprehensive understanding(Voigt et al.,2020b). Unlike conventional sequencing methods, single-cell RNAsequencing(scRNA-seq) and single-nucleus RNA-sequencing(snRNA-seq) accurately profile transcriptomic characterization of individual whole cells and nuclei, respectively.

关键词： cell retina

The International Migration of Talent and Talent Security

在线全文

学校读者我要写书评

暂无评论

Contemporary International Relations 2010年第2期20卷 49-63页

作者： Dai changzheng wang Haibin Professor and Dean of the School of International Relations University of International Business and Economics （UIBE）

There are basically three different types of internationally mobile talent: industry talents, professionals, and talents of the social sciences and culture. There are seven different factors underlying the international migration of talented people: the global income gap, the pursuit of personal worth, requirements of national development, technical innovation, industrial agglomeration, language and cultural compatibility, and immigration policies. The international migration of talent increasingly highlights the issue of international talent security, and has a far-reaching impact on personal safety, as well as national and global security. Therefore, cooperation on international talent safety issues should be strengthened in order to establish a more regular order to the international migration of talent, and to reduce the negative effects brought about by it, so as to promote economic globalization and sound economic and political progress in the international community.

关键词：国际社会安全问题移民政策人才经济全球化文化艺术专业人士社会科学

IL-10-Producing Type 1 Regulatory T Cells and Allergy

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2007年第4期4卷 269-275页

作者： Kui Wu Yutian Bi Kun Sun changzheng wang Department of Respiratory Disease Daping Hospital Third Military Medical University Chongqing 400042 China Institute of Respiratory Disease Xinqiao Hospital Third Military Medical University Chongqing 400037 China

As an important subset of regulatory T （Treg） cells, IL-10-producing type 1 regulatory T cells （Trl）, have some different features to thymic-derived naturally occurring CD4^＋CD25^＋Foxp3^＋ Treg cells（nTreg cells）. Similar to nTreg cells, Trl also play important roles in the control of allergic inflammation in several ways. There is a fine balance between Trl and Th2 responses in healthy subjects. Skewing of allergic-specific effctor T cells to a Trl phenotype appears to be a critical event in successful allergen-specific immunotherapy and glucocorticoids and β2-agonists treatment. Trl suppress Th2 cells and effector cells of allergic inflammation, such as eosinophils, mast cells, basophils, through producing IL-10, and perhaps TGF-β. Understanding of Trl may be helpful in developing new strategies for treatment of allergic diseases.

关键词： allergic disease immune dysregulation interleukin 10 regulatory T cell type 1 regulatory T cell

在线全文

学校读者我要写书评

暂无评论

主给水调节阀更换调试

核动力工程 2015年第S1期36卷 114-117页

作者：王长征中核核电运行管理有限公司浙江海盐314300

介绍运行机组主给水调节阀更换后的调试试验项目,分析了调试试验风险并提出了应对措施。着重介绍主给水调节阀调试过程中出现的问题及处理方法。

关键词：主给水调节阀超调振荡定位器放大器摩擦