检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

都江堰枢纽分流规律研究

水力发电学报 2006年第3期25卷 11-15页

作者：孙砚方彭述明王兴奎郑钧徐兴文四川省都江堰管理局四川都江堰市611830 清华大学水沙科学教育部重点实验室北京100084

根据都江堰枢纽区67年的实测流量资料分析了都江堰鱼嘴和宝瓶口的分流规律。1949年以前的十多年间,春灌期内江分流不到五成,而在主汛期则接近六成,说明“分四六”的法则并不确切。1974年修建外江闸以后,春灌期内江分流接近75%,而汛期只... 详细信息

根据都江堰枢纽区67年的实测流量资料分析了都江堰鱼嘴和宝瓶口的分流规律。1949年以前的十多年间,春灌期内江分流不到五成,而在主汛期则接近六成,说明“分四六”的法则并不确切。1974年修建外江闸以后,春灌期内江分流接近75%,而汛期只有37.5%,鱼嘴分流比历史传说的“分四六”还要优越。宝瓶口的引水量受飞沙堰、人字堤维护及凤栖窝淘淤的影响,1992年建成工业引水挡水闸后10年没有淘淤,同样保证了宝瓶口的引水。外江闸和工业引水挡水闸的修建,极大地改善了都江堰的分流条件,对春灌引水和汛期防洪都提供了基本的保证。

关键词：分流都江堰鱼嘴宝瓶口

Approach from the laboratory to the field: New strategies in the control of mosquito-borne infectious diseases

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年第1期 303-305页

作者： Ziqian xu Lianpan Dai jun Liu National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases (NITFID) National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and Prevention CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of Sciences

Vector-borne viruses, transmitted among humans and animal hosts through bites of vectors such as mosquitoes and ticks,pose a great and ongoing threat to public health and biosafety(Yang et al., 2022).Among them, dengue virus-induced epidemics, have dramatically increased worldwide in recent decades. The report released by the World Health Organization(WHO) at the end of 2023 showed that dengue epidemic globally surged in2023, with the number of reported cases nearing a historical peak.

关键词：

Operation optimization of the steel manufacturing process: A brief review

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1274-1287页

作者： Zhao-jun xu Zhong zheng Xiao-qiang Gao College of Material Science and Engineering Chongqing UniversityChongqing 400045China School of Economics and Business Administration Chongqing UniversityChongqing 400030China

Against the realistic background of excess production capacity, product structure imbalance, and high material and energy consumption in steel enterprises, the implementation of operation optimization for the steel manufacturing process is essential to reduce the production cost, increase the production or energy efficiency, and improve production management. In this study, the operation optimization problem of the steel manufacturing process, which needed to go through a complex production organization from customers' orders to workshop production, was analyzed. The existing research on the operation optimization techniques, including process simulation, production planning, production scheduling, interface scheduling, and scheduling of auxiliary equipment, was reviewed. The literature review reveals that, although considerable research has been conducted to optimize the operation of steel production, these techniques are usually independent and ***, the future work related to operation optimization of the steel manufacturing process based on the integration of multi technologies and the intersection of multi disciplines were summarized.

关键词： intelligent manufacturing operation optimization steel manufacturing process process simulation production planning production scheduling

在线全文

学校读者我要写书评

暂无评论

上海市熟食生产企业卫生现况及监督管理对策

上海预防医学 2003年第10期15卷 495-497页

作者：郑雷军徐晨姚玉君李洁上海市卫生局卫生监督所上海200031

[目的 ]　了解上海市熟食生产企业的卫生现况 ,提出进一步规范上海市熟食生产、销售行为的对策。　 [方法 ]　采用填写调查表和实地调研等方式对熟食生产企业进行调查 ,并收集近 2年来的熟食抽检资料 ,以GB2 72 6《酱卤肉类卫生标准》... 详细信息

[目的 ]　了解上海市熟食生产企业的卫生现况 ,提出进一步规范上海市熟食生产、销售行为的对策。　 [方法 ]　采用填写调查表和实地调研等方式对熟食生产企业进行调查 ,并收集近 2年来的熟食抽检资料 ,以GB2 72 6《酱卤肉类卫生标准》为评价依据 ,分析熟食合格率与生产企业卫生状况之间的关系。　 [结果 ]　上海市生产的熟食多采用散装形式 ,未完全实现贮存、运输、销售的冷链化 ,且熟食抽检合格率与其抽签地点、包装形式及冷链化情况有关。　 [结论 ]　应实施熟食的包装化及贮存、运输、销售的冷链化 ,并推进熟食生产良好操作规范 (GMP)和食品安全保证体系 (HACCP)

关键词：上海熟食生产企业卫生现况监督管理对策

A polyphenol-modified chitosan hybrid hydrogel with enhanced antimicrobial and antioxidant activities for rapid healing of diabetic wounds

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 905-916页

作者： Zejun xu Guiting Liu Li zheng jun Wu The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation Sun Yat-Sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120China Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration Life Science InstitutesGuangxi Medical UniversityNanning 530021China Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry Guangxi Medical UniversityNanning 530021China Bioscience and Biomedical Engineering Thrust The Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400China Division of Life Science The Hong Kong University of Science and TechnologyHong Kong 999077China

High oxidative stress injury and bacterial infection are the main challenges that impair wound healing in diabetic ***,a hydrogel with enhanced antimicrobial and antioxidant properties was developed for rapid healing of diabetic *** this study,chitosan methacrylate-gallic acid(CSMA-GA)polymer with antioxidant activity,antimicrobial activity,and ultraviolet(UV)-triggered gelling properties was developed as a hydrogel ***,amphiphilic Pluronic F127 molecules were used to load hydrophobic chlorhexidine drug molecules to obtain F127/chlorhexidine nanoparticle(NP)with strong antibacterial ***,F127/chlorhexidine NPs were encapsulated in CSMA-GA hydrogel to further enhance its antibacterial *** hybrid hydrogel platform(CSMA-GA/F127/chlorhexidine(CMGFC))exhibited high antibacterial efficiency(>99.9%)and strong reactive oxygen species(ROS)scavenging ability(>80.0%),which effectively protected cells from external oxidative stress(upregulated superoxide dismutase(SOD)and glutathione/oxidized glutathione disulfide(GSH/GSSG)levels and downregulated malondialdehyde(MDA)levels).Moreover,in vivo results proved that the CMGFC hydrogel significantly reduced inflammatory responses(downregulated interleukin-6(IL-6)and upregulated interleukin-10(IL-10)levels),promoted angiogenesis(upregulated vascular endothelial growth factor(VEGF)and platelet endothelial cell adhesion molecule-1(CD 31)levels),and wound healing(enhanced collagen deposition and tissue remodelling).Overall,the CMGFC hydrogel with enhanced antimicrobial and antioxidant properties demonstrated significant potential to enhance diabetic wound healing.

关键词： antimicrobial antioxidant diabetic wound hydrogel

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

基于FPGA的宏电路模块生成器

上海大学学报（自然科学版） 1999年第S1期5卷 170-175页

作者：郑瑞李军徐拾义上海大学计算机工程与科学学院上海200072

在简要介绍现代IC设计自动化方法的基础上,提出一个小型的适用于FPGA设计的辅助工具——自动宏生成器该工具能够根据用户的需要快速生成一系列特定于某—FPGA结构的宏,而这些宏能够直接被用作为大型数字电路中的一部分,从而简化设计的... 详细信息

在简要介绍现代IC设计自动化方法的基础上,提出一个小型的适用于FPGA设计的辅助工具——自动宏生成器该工具能够根据用户的需要快速生成一系列特定于某—FPGA结构的宏,而这些宏能够直接被用作为大型数字电路中的一部分,从而简化设计的难度并提高设计的速度、本文还将论及面向对象技术在EDA(Electronic Design Automation)工具开发中的应用.

关键词：宏 EPGA IC设计

Improving color rendering index of Mn-doped ZnO nanorods on silicon-based substrate

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第9期36卷 711-717页

作者： zheng-Long Wu Bin Tian Hai-jun xu Analytical and Testing Center Beijing Normal University State Key Laboratory of Chemical Resource Engineering and School of Science Beijing University of Chemical Technology

Porous silicon pillar array（PSPA） samples which are ideal substantial materials with dominant electronic and luminescence properties were prepared by surface etching method. ZnO nanorods with or without Mn doping grown uniformly and aligned onto PSPA regardless of lattice matching show various photoluminescence（PL）properties. The doped Mn ions in ZnO nanorods were directly observed by X-ray photoelectron spectroscopy（XPS）,and ZnO structures were detected by X-ray diffraction（XRD）. As the doping concentration increases,XRD peaks of ZnO nanorods shift to low angle. The influences of doping Mn ions on luminescence properties of ZnO nanorods were investigated. Except for the ultraviolet（UV） PL band, the broad PL band is observed at visible region. The band could be divided into three separate bands（orange, green and red） by Lorentzian deconvolution. The intensity of orange PL band firstly increases then decreases, and then gets the maximum at the doping Mn-to-Zn molar ratio of 2.0：100.0 which is the most effective doping concentration. The green PL band is attributed to zinc vacancy of ZnO, the orange PL band to Mn ions recombination of itself, and the red PL band to oxygen vacancy of ZnO, respectively. As the Mn-doped ZnO nanorods could emit yellow green luminescence excited by UV radiation, and doped Mn ions could improve the color rendering index of the luminescence, the nanorods could be used as promising white-light emitters in the future.

关键词： ZnO/Mn nanorod arrays Photoluminescence White light Hydrothermal synthesis

Aerosol effects on ozone concentrations in Beijing:A model sensitivity study

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第4期24卷 645-656页

作者： jun xu Yuanhang Zhang Shaoqing zheng Youjiang He State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing 100012 China College of Environmental Sciences Peking University Beijing 100871 China Appraisal Center for Environment ＆ Engineering State Environmental Protection Administration Beijing 100012 China

Most previous O3 simulations were based only on gaseous phase photochemistry. However, some aerosol-related processes, namely, heterogeneous reactions occurring on the aerosol surface and photolysis rate alternated by aerosol radiative influence, may affect O3 photochemistry under high aerosol loads. A three-dimensional air quality model, Models-3/Community Multi-scale Air Quality-Model of Aerosol Dynamics, Reaction, Ionization, and Dissolution, was employed to simulate the effects of the above-mentioned processes on O3 formation under typical high O3 episodes in Beijing during summer. Five heterogeneous reactions, i.e., NO2, NO3, N2O5, HO2, and O3, were individually investigated to elucidate their effects on O3 formation. The results showed that the heterogeneous reactions significantly affected O3 formation in the urban plume. NO2 heterogeneous reaction increased O3 to 90 ppb, while HO2 heterogeneous reaction decreased O3 to 33 ppb. In addition, O3 heterogeneous loss decreased O3 to 31 ppb. The effects of NO2, NO3, and N2O5 heterogeneous reactions showed opposite O3 concentration changes between the urban and extra-urban areas because of the response of the reactions to the two types of O3 formation regimes. When the aerosol radiative influence was included, the photolysis rate decreased and O3 decreased significantly to 73 ppbO3. The two aerosol-related processes should be considered in the study of O3 formation because high aerosol concentration is a ubiquitous phenomenon that affects the urbanand regional air quality in China.

关键词： aerosol heterogeneous reactions ozone radiative influence

Primary parenchymal squamous cell carcinoma of the kidney:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第4期13卷 34-40页

作者： Zhi-Hui zheng Bo Shao Chao-Min xu Ke Wang Jia-Zhu Wen Li-Kang Luo Jia-Cheng Guan Department of Ultrasound The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Radiology Shulan(Quzhou)HospitalQuzhou 324000Zhejiang ProvinceChina Department of Radiology The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Pathology The Second people’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina

BACKGROUND Primary squamous cell carcinoma(SCC)of the renal parenchyma is extremely rare,with only nine cases *** SUMMARY This study reports a 51-year-old man with primary SCC of the renal *** patient was admitted with recurrent dull pain and discomfort in the right lumbar region,which had worsened over 2 weeks,accompanied by painful gross *** antigen(SCCA)levels were elevated,and imaging revealed a renal mass with associated *** patient underwent laparoscopic unilateral nephrectomy and lymph node *** pathology confirmed highly differentiated SCC with necrosis in the right renal parenchyma,with negative renal pelvis and *** pathological stage was *** months after surgery,the tumor recurred with involvement of the liver,right psoas major muscle,and inferior vena *** patient refused chemotherapy and succumbed to the disease 6 months postoperatively due to disease *** We report a case of primary SCC of the renal parenchyma,a rare renal *** clinical symptoms,laboratory tests,and imaging findings are nonspecific,making accurate and timely diagnosis *** to the literature,for patients with renal calculi accompanied by a renal mass,elevated serum SCCA levels,and magnetic resonance imaging showing cystic or cystic-solid masses within the kidney with pseudocapsules and heterogeneous mild enhancement,the possibility of this disease should be considered.

关键词： Renal tumor Renal parenchyma Squamous cell carcinoma Renal calculi Computed tomography Case report