检索结果-南通市图书馆

Conceptualizing Discourses on Ecological City and Its Planning

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2009年第4期7卷 69-81页

作者： zhang yingxuan Zhou Wenhua Wang Min Ouyang Zhiyun State Key Laboratory of Urban and Regional Ecology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Ecological city(eco-city) and its planning approach are emerging concepts in urban study,urban planning,ecological economics,environmental policy and corporate environmental ***,opinions remain divided over the connotation and denotation of the term"ecological city",what key issues ecocity planning can solve,and its specific *** this study,we present 10 basic propositions that define the eco-city and clarify its key parameters,thereby providing the basis for discussing the assumptions and principles underlying different approaches to sustainable urban *** then summarize the concept and principles of an eco-city,and define the main requirements for ecocity *** conclude that an eco-city is a city in which the urban population,scale of land use and intensity of human activities are limited to the regional resource and environmental carrying capacity,which does not cause increasing or irreversible damage to the regional ecosystem's structure,functions and processes.

关键词： urbanization regional ecosystem socioeconomic system city size human carrying capacity

Statistical Methodologies Used to Calculate Urbanization Rates in China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2010年第3期8卷 89-96页

作者： Shi Jie zhang yingxuan Hu Dan Cao Huili Regional Research Institute China Academy of Urban Planning and Design Beijing 100044 China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China YaTai DuHui Urban Planning and Design Research Institute Beijing 100025 China

To analyze China’s actual urbanization level, we iden- tified two statistical approaches: using the population living within the administrative boundaries ("administrative-based" method) and within the urbanized or built-up areas ("infrastructure-based" method) of cities and towns as urban population. To illustrate the two approaches and the associated problems, we used data for Tangshan City as a case study. The estimates on the "administrative-based" method were unreliable and the "infrastructurebased" method provided a 29.4% urbanization rate for Tangshan City in 2002, which is lower than the mean of 36.1% for China as a whole published after the fifth national census in 2000. Given the city’s geographic location, comprehensive urban construction and economic development indicators, its urbanization rate should be higher than the average level. Thus, our results indicate that the value of 36.1% was higher than the actual status as a result of poor statistical quality and overestimation of the floating population.

关键词： urban population scope of urban population statistics urbanization level census

Bi-Objective Optimization: A Pareto Method with Analytical Solutions

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics 2023年第1期14卷 57-81页

作者： David W. K. Yeung yingxuan zhang SRS Consortium for Advanced Studies Shue Yan University Hong Kong China Center of Game Theory St Petersburg State University Saint Petersburg Russia Department of Finance Asia University Taiwan China

Multiple objectives to be optimized simultaneously are prevalent in real-life problems. This paper develops a new Pareto Method for bi-objective optimization which yields analytical solutions. The Pareto optimal front is obtained in closed-form, enabling the derivation of various solutions in a convenient and efficient way. The advantage of analytical solution is the possibility of deriving accurate, exact and well-understood solutions, which is especially useful for policy analysis. An extension of the method to include multiple objectives is provided with the objectives being classified into two types. Such an extension expands the applicability of the developed techniques.

关键词： Multi-Objective Optimization Pareto Optimal Front Analytical Solution Lagrange Method Karush-Kuhn-Tucker Conditions

Peptide RL-QN15 promotes wound healing of diabetic foot ulcers through p38 mitogen-activated protein kinase and smad3/miR-4482-3p/vascular endothelial growth factor B axis

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

Burns & Trauma 2023年第1期11卷 694-708页

作者： Dandan Sun Kun Guo Naixin Liu Yilin Li Yuansheng Li Yan Hu Shanshan Li Zhe Fu Yinglei Wang Yutong Wu yingxuan zhang Jiayi Li Chao Li Zhuo Wang Zijian Kang Jun Sun Ying Wang Xinwang Yang Department of Anatomy and Histology and&Embryology Faculty of Basic Medical ScienceKunming Medical UniversityNo.1168 Chunrong West RoadChenggong DistrictKunming650500YunnanChina Department of Biochemistry and Molecular Biology Faculty of Basic Medical ScienceKunming Medical UniversityNo.1168 Chunrong West RoadChenggong DistrictKunming650500YunnanChina Key Laboratory of Chemistry in Ethnic Medicinal Resources&Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes State Ethnic Affairs Commission&Ministry of EducationSchool of Ethnic MedicineYunnan MinZu UniversityNo.2929 Yuehua StreetChenggong DistrictKunming650504YunnanChina

Background:Wound management of diabetic foot ulcers(DFUs)is a complex and challenging task,and existing strategies fail to meet clinical ***,it is important to develop novel drug candidates and discover new therapeutic ***,reports on peptides as molecular probes for resolving issues related to DFUs remain *** study utilized peptide RL-QN15 as an exogenous molecular probe to investigate the underlying mechanism of endogenous non-coding RNA in DFU wound *** aim was to generate novel insights for the clinical management of DFUs and identify potential drug ***:We investigated the wound-healing efficiency of peptide RL-QN15 under diabetic con-ditions using in vitro and in vivo experimental *** sequencing,in vitro transfection,quantitative real-time polymerase chain reaction,western blotting,dual luciferase reporter gene detection,in vitro cell scratches,and cell proliferation and migration assays were performed to explore the potential mechanism underlying the promoting effects of RL-QN15 on DFU ***:Peptide RL-QN15 enhanced the migration and proliferation of human immortalized keratinocytes(HaCaT cells)in a high-glucose environment and accelerated wound healing in a DFU rat *** on results from RNA sequencing,we defined a new microRNA(miR-4482-3p)related to the promotion of wound *** bioactivity of miR-4482-3p was verified by inhibiting and overexpressing *** of miR-4482-3p enhanced the migration and proliferation ability of HaCaT cells as well as the expression of vascular endothelial growth factor B(VEGFB).RLQN15 also promoted the migration and proliferation ability of HaCaT cells,and VEGFB expression was mediated via inhibition of miR-4482-3p expression by the p38 mitogen-activated protein kinase(p38MAPK)and smad3 signaling ***:RL-QN15 is an effective molecule for the treatment of DFUs,with the underlying mechanism related to the inhibition of miR-448

关键词： RL-QN15 Diabetic foot ulcer Wound healing miR-4482-3p Vascular endothelial growth factor B Peptide Mitogenactivated protein kinase

一步法制备自相似结构超疏水涂层及混凝土表面应用性能

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

复合材料学报 2023年第10期40卷 5692-5705页

作者：鲁浈浈张应轩唐超葛倩倩陈悦重庆交通大学土木工程学院重庆400074 重庆交通大学交通土建工程材料国家地方联合工程实验室重庆400074

探寻一种简单方法制备具有自修复性能的环氧树脂(EP)-硅酮胶-SiO_(2)超疏水复合涂层,并且能够涂覆于类似于混凝土等结构物表面,该涂层在受到化学及机械破坏的情况下,可以实现自修复。通过简单的一步法在混凝土粗糙结构表面制备一种具有... 详细信息

探寻一种简单方法制备具有自修复性能的环氧树脂(EP)-硅酮胶-SiO_(2)超疏水复合涂层,并且能够涂覆于类似于混凝土等结构物表面,该涂层在受到化学及机械破坏的情况下,可以实现自修复。通过简单的一步法在混凝土粗糙结构表面制备一种具有自修复性能的EP-硅酮胶-SiO_(2)超疏水复合涂层,具体步骤为将EP、高分子中性硅酮胶和纳米SiO_(2)等材料溶解于乙醇溶液,经8 h磁力搅拌和20 min超声分散后得到超疏水涂层溶液,采用喷涂法在混凝土表面成功制备具有自修复性能的多层相似结构超疏水涂层。当EP含量为2wt%,高分子中性硅酮胶含量为3wt%,纳米SiO_(2)含量为3wt%时涂层疏水性能最佳,此时,接触角(CA)为156°±1.2°,滚动角(SA)为6°±0.8°。涂层在2.66 kPa的压强下可以经受8 m磨损(1.7μm砂纸),在盐性环境(2 mol/L NaCl溶液)、酸性环境(pH=3,醋酸)中腐蚀8 h仍保持超疏水性;可承受碱性破坏(pH=12,NaOH溶液)-自修复循环8次,机械破坏-自修复可循环4次;同时涂层展现出优异的自清洁及防水性能。力学及环境腐蚀破坏实验表明涂层的自相似结构可以保证上层被破坏后由下层(具有相同的微纳米粗糙结构)来保持超疏水性;损坏-修复实验表明涂层经过加热可以使高分子中性硅酮胶带动涂层内部低表面能分子及纳米SiO_(2)发生迁移而实现涂层的修复。该涂层简单的制备方法、良好的耐机械磨损性及优异的自修复性,为超疏水涂层的实际应用提供了可能。

关键词：超疏水自修复复合涂层自相似环氧树脂

在线全文

学校读者我要写书评

暂无评论

基于移动平台的电力营销系统设计研究

电力系统装备 2024年第4期 165-167页

作者：张樱譞国网天津市电力公司宝坻供电分公司天津301800

各类通信技术的广泛应用与持续发展,在现有的移动平台智能终端中发挥了较大的应用优势,奠定其在电力营销领域内推广应用的坚实基础。文章分析了基于移动平台的电力营销系统的整体设计,并从业扩报装子系统、电量电费子系统、移动平台计... 详细信息

各类通信技术的广泛应用与持续发展,在现有的移动平台智能终端中发挥了较大的应用优势,奠定其在电力营销领域内推广应用的坚实基础。文章分析了基于移动平台的电力营销系统的整体设计,并从业扩报装子系统、电量电费子系统、移动平台计量管理3个角度出发,阐述了基于移动平台的电力营销系统的设计要点,以期为电力营销人员提供参考。

关键词：移动平台电力营销系统设计要点

基于16S rRNA测序分析肾虚证先兆流产的阴道菌群特征

维普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

中国实验方剂学杂志 2023年第21期29卷 123-131页

作者：张慧敏陈思张莹轩黄煦格郜洁广州中医药大学第一临床医学院广州510405 广州中医药大学第一附属医院广州510405 广州中医药大学岭南妇科病研究所广州510405

目的:探讨肾虚证早期先兆流产的阴道菌群结构特征。方法:选取2018年5月至2020年12月就诊于广州中医药大学第一附属医院的肾虚证早期先兆流产患者(DK-TA组)31例、正常早孕女性(NP组)116例,收集两组人群的阴道分泌物,采用16S rRNA测序技术... 详细信息

目的:探讨肾虚证早期先兆流产的阴道菌群结构特征。方法:选取2018年5月至2020年12月就诊于广州中医药大学第一附属医院的肾虚证早期先兆流产患者(DK-TA组)31例、正常早孕女性(NP组)116例,收集两组人群的阴道分泌物,采用16S rRNA测序技术,对两组阴道菌群群落组成及差异菌进行分析。结果:与NP组比较,Alpha多样性显示DK-TA组阴道菌群丰富度及多样性显著增高。通过Binary jaccard及unweighted_unifrac两种距离矩阵分析可知两组阴道菌群的相似性、分散性、丰度及进化关系存在明显差异。在门水平上,与NP组比较,DK-TA组的拟杆菌门、梭杆菌门相对丰度降低,而变形菌门及芽单胞菌门相对丰度明显增高;在属水平上,与NP组比较,DK-TA组纤毛菌属、双歧杆菌属相对丰度降低,而志贺氏菌属、卫星沙特尔沃思氏菌属明显升高。线性判别分析(LEfSe)拟杆菌门、梭杆菌门、双歧杆菌属为NP组阴道优势菌种。变形菌门、厚壁菌门是DK-TA组的阴道优势菌种。功能预测发现DK-TA组与环腺苷3’,5’-单磷酸信号通路、炎症介质对色氨酸通道的调节等38个功能路径密切相关,且两组阴道差异菌与差异代谢路径存在明显的正负关联。结论:变形菌门、芽单孢菌门、拟杆菌门可能是表征肾虚证早期先兆流产的阴道菌群生物标志物。

关键词：先兆流产肾虚证 16S rRNA测序阴道菌群

在线全文

学校读者我要写书评

暂无评论

气相色谱法测定鸡蛋中氯霉素残留量

农产品加工（下） 2006年第6期 65-66页

作者：张英宣新疆兵团畜牧兽医工作总站乌鲁木齐830063

研究了鸡蛋中氯霉素残留的气相色谱测定方法。样品经乙酸乙酯提取后,用SylonBFT衍生化,进电子捕获检测仪(ECD)测定,外标法定量。结果表明,方法的线性范围为1.0￣300.0ng/mL,平均回收率达93.4%,平均相对标准偏差5.5%,检测限为0.1μg/kg。

关键词：鸡蛋氯霉素气相色谱法检测

术前γ-谷氨酰转肽酶/血小板比值、AST/血小板比值对肝细胞癌患者并发微血管浸润的预测价值

在线全文

学校读者我要写书评

暂无评论

中华肝胆外科杂志 2021年第6期27卷 454-456页

作者：谷宇飞刘豪冯亮杰张应选乔师师郑州大学第一附属医院肝胆胰外科郑州450052

回顾性分析208例确诊肝细胞癌并发微血管浸润(MVI)的患者与233例同期按随机数表法选取的肝细胞癌未并发MVI的患者的临床资料,探究术前外周血γ-谷氨酰转肽酶/血小板比值(GPR)、天冬氨酸氨基转移酶/血小板比值(APR)对肝细胞癌患者并发MV... 详细信息

回顾性分析208例确诊肝细胞癌并发微血管浸润(MVI)的患者与233例同期按随机数表法选取的肝细胞癌未并发MVI的患者的临床资料,探究术前外周血γ-谷氨酰转肽酶/血小板比值(GPR)、天冬氨酸氨基转移酶/血小板比值(APR)对肝细胞癌患者并发MVI的预测价值。结果表明,术前GPR和APR水平是肝细胞癌患者并发MVI的独立危险因素,GPR>0.32与APR>0.18的肝细胞癌患者并发MVI的可能性大,且两者与甲胎蛋白联合可提高对MVI的预测价值。

关键词：肝细胞癌患者天冬氨酸氨基转移酶预测价值微血管浸润甲胎蛋白血小板临床资料 APR