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

城市轨道交通轨道物流组织模式的探索

城市轨道交通研究 2024年第10期27卷 156-159,164页

作者：雷晓瑜覃晴孙西敬深圳市地铁集团有限公司深圳518026 中铁第四勘察设计院集团有限公司武汉430063

[目的]为充分利用城市轨道交通富余运力,发展物流服务,以深圳地铁为例,基于城市配送市场与城市轨道交通的匹配性,研究适合轨道物流的应用模式。[方法]结合供需时空匹配关系及城市轨道交通特点,提出可广泛适用的应用场景,基于不同载运方... 详细信息

[目的]为充分利用城市轨道交通富余运力,发展物流服务,以深圳地铁为例,基于城市配送市场与城市轨道交通的匹配性,研究适合轨道物流的应用模式。[方法]结合供需时空匹配关系及城市轨道交通特点,提出可广泛适用的应用场景,基于不同载运方式,重点对城市轨道交通多种物流组织模式进行研究。本次轨道物流组织模式基于快递场景进行探索研究,从具体实践及运输组织研究分析了城市轨道交通接驳同城物流、航空物流、高铁物流、干线陆运物流的组织模式、部分问题及解决思路,针对不同接驳模式下的不同运输组织形式进行优劣分析,通过实践测试验证了同城接力模式的时效性及可行性,提出大型枢纽的物流组织模式等研究探索经验。[结果及结论]通过研究实践得到:一是城市轨道交通在一定场景下承担同城快递接力服务具有时效性高的优势,且证明了整体物流组织的可行性;二是在高铁枢纽设计中应充分考虑物流功能的互联互通设计以实现货物的“干支配”接驳换乘条件;三是快递二级分拨中心与城市轨道交通轨道场段融合设置可高效实现干线陆运接驳,优化解决部分“最后一公里问题”。

关键词：城市轨道交通轨道物流运输模式物流接驳

湖南省农业科技园区创新发展能力多维评价研究

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

经济地理 2024年第1期44卷 139-147页

作者：刘灿廖婷谭力铭雷筱娱石琳湘潭大学商学院湖南湘潭411105 湖南省科学技术信息研究所湖南长沙410001

文章从创新研发、创新服务、创新带动、创新驱动4个维度选取18个要素指标,构建农业科技园区(以下简称“农科园”)创新发展能力评价指标体系,运用多因子加权综合评价法、GIS空间分析法、K聚类分析等方法对湖南省42家农业科技园区的创新... 详细信息

文章从创新研发、创新服务、创新带动、创新驱动4个维度选取18个要素指标,构建农业科技园区(以下简称“农科园”)创新发展能力评价指标体系,运用多因子加权综合评价法、GIS空间分析法、K聚类分析等方法对湖南省42家农业科技园区的创新发展能力进行空间布局和分层分类分析。结果表明:(1)湖南省农科园的创新发展能力呈现出以长株潭为核心、各市(州)国家级农科园为散点的“一核多点”式布局特征,全省农科园整体创新带动能力较强、创新研发能力相对较弱。(2)湖南省42家农科园可分为三类,其中13家国家农科园为创新发展引领类农科园,浏阳、祁东等21家农科园为创新发展稳健类农科园,临湘、南县等8家农科园为创新发展起步类农科园。建议湖南省对照国家农科园“333”布局,加大农科园培育力度,完善层次分明的农科园体系;提升农科园自主创新能力,打造农业产业集群;建立常态化的全省农科园创新发展能力监测评价与服务机制。

关键词：农业科技园区创新发展能力 GIS空间分析多因子加权 K聚类分析

Theoretical model of azimuthal combustion instability subject to non-trivial boundary conditions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第9期37卷 113-130页

作者： lei QIN xiaoyu WANG Guangyu ZHANG Xiaofeng SUN Research Institute of Aero-Engine Beihang UniversityBeijing 100191China School of Energy and Power Engineering Beihang UniversityBeijing 100191China

The problem of evaluating the sensitivity of non-trivial boundary conditions to the onset of azimuthal combustion instability is a longstanding challenge in the development process of mod-ern gas *** difficulty lies in how to describe three-dimensional in-and outlet boundary conditions in an artificial computational *** date,the existing analytical models have still failed to quantitatively explain why the features of the azimuthal combustion instability of a com-bustor in laboratory environment are quite different from that in a real gas turbine,making the sta-bility control devices developed in laboratory generally lose the effectiveness in practical *** overcome this limitation,we provide a novel theoretical framework to directly include the effect of non-trivial boundary conditions on the azimuthal combustion instability.A key step is to take the non-trivial boundary conditions as equivalent distributed sources so as to uniformly describe the physical characteristics of the inner surface in an annular enclosure along with different in-and outlet ***,a dispersion relation equation is established by the application of three-dimensional Green's function approach and generalized impedance *** show that the effects of the generalized modal reflection coefficients on azimuthal unstable modes are extremely prominent,and even prompt the transition from stable to unstable mode,thus reasonably explaining why the thermoacoustic instability phenomena in a real gas tur-bine are difficult to observe in an isolated combustion ***,this work provides an effective tool for analysis of the azimuthal combustion instability including various complicated boundary conditions.

关键词： Combustion instability Aeroacoustics Modeling Optimization techniques Control

Determination of Chlorine Content in Zirconia Containing Special Refractories

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

China's Refractories 2022年第3期31卷 38-41页

作者： XU Xiaoying CAO Haijie DUAN Xueke lei xiaoyu Sinosteel Luoyang Institute of Refractories Research Co. Ltd.Luoyang 471039China

In this study,zirconia containing refractory samples were decomposed by dilute nitric *** chloride ion content in the leaching solution was determined by thiocyanate *** influences of the leaching method of the sample pretreatment and the coloration condition of the solution to be tested on the test results were *** precision test was carried out and the results were compared with those determined by ion *** results showed that the zirconia containing refractories were boiled with dilute nitric acid to obtain the test *** influence of zirconium hydrolysis on determination was removed by *** chlorine contents in zirconia containing refractories determined by spectrophotometry have low relative standard deviation(RSD),showing slight testing difference with those determined by ion chromatograghy.

关键词： zirconia refractory materials chlorine content determination

Effect of Antibacterial Enoxacin on the Properties of Injectable Nano-hydroxyapatite/Polyurethane Cement for Bone Repairing

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2022年第2期19卷 483-496页

作者： Jinzheng Zhang xiaoyu lei Jiajing Tang Jie Chen Qing Zhao Wei Fang Yinglong Zhang Yubao Li Yi Zuo Research Center for Nano-Biomaterials Analytical and Testing CenterSichuan UniversityChengdu 610064People’s Republic of China

Biomaterial-associated infection(BAI)is a kind of serious post-operative complication in orthopaedic ***-loaded bone cement shines a light on BAI prevention for convenient manipulation and complex *** this aim,we designed an antibacterial bone cement based on Nano-hydroxyapatite/Polyurethane(PUHA)loading with antibiotic Enoxacin(EN).The distinct shear-thinning behavior of the prepolymers was observed,indicating a good *** PUHA bone cement possessed a suitable curing speed,and the addition of EN might slightly expedite the curing process and enhance the mechanical *** EN release profile indicated that the EN-loaded bone cement could reach the minimum inhibitory concentration in 2 h,and sustainedly released EN for almost 8 days,exhibiting an antibacterial delivery *** test further confirmed the antibacterial ability of EN-loaded bone cement is in a dose-dependent ***,the osteogenic performance of drug-loaded bone cement with high dosage is not as good as antibacterial *** the EN concentration of antibacterial cement was lower than 32μg·mL^(-1),the proliferation and osteogenic differentiation of rat mesenchymal stem cells could be significantly ***,this study verified the potential of the EN-loaded PUHA bone cement in anti-infection and osteogenesis for bone repairing.

关键词： Antibacterial bone cement Nano-hydroxyapatite/polyurethane Enoxacin Shear-thinning behavior Osteogenesis

天津市卫生资源配置和经济发展的耦合协调研究

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

中国医药导报 2024年第20期21卷 114-119页

作者：雷笑瑜吴锋刘德瑾张磊磊褚振海天津市眼科医院院长办公室天津300020 天津市胸科医院党委办公室天津300222 天津市眼科医院人事科天津300020 天津市卫生健康委员会人事处天津300050 天津市眼科医院行风办公室天津300020

目的研究天津市卫生资源配置与经济发展的耦合协调关系及障碍因素,为促进卫生资源与社会经济协同发展提供决策依据。方法从2023年《天津统计年鉴》获取2022年天津市各行政区经济发展和卫生资源配置状况的相关数据。通过熵权法计算各指... 详细信息

目的研究天津市卫生资源配置与经济发展的耦合协调关系及障碍因素,为促进卫生资源与社会经济协同发展提供决策依据。方法从2023年《天津统计年鉴》获取2022年天津市各行政区经济发展和卫生资源配置状况的相关数据。通过熵权法计算各指标权重,利用耦合协调模型评价卫生资源配置与经济发展耦合协调度及发展状态,采用障碍度分析模型分析两系统耦合协调度的障碍因子。结果2022年滨海新区是天津市人口最多,地区生产总值、一般公共预算支出和卫生健康支出最高的行政区;宁河区年平均工资、第三产业比重、一般公共预算支出、医院数、卫生机构床位数、医院床位数最低。东丽区、西青区和滨海新区经济发展超前于卫生资源配置,其他行政区经济发展滞后于卫生资源配置。滨海新区经济发展与卫生资源配置良好协调,耦合协调度为0.84;宁河区严重失调,耦合协调度为0.16。经济发展系统中,第三产业比重是滨海新区耦合协调度最主要的障碍因子,一般公共预算支出和地区生产总值是其他行政区的主要障碍因子;卫生资源配置系统中,和平区、河东区、河西区、南开区、河北区、红桥区主要障碍因子各不相同,而其他行政区主要障碍因子为每千人注册护士数、每千人执业医师数、每千人床位数。结论天津市卫生资源配置与经济发展协调程度较低且经济发展普遍滞后于卫生资源配置,而其障碍因素复杂,应通过加强发展低地的投入、在控制卫生资源扩张的同时提高卫生资源的质量、加大卫生投入和区分不同行政区采取措施促进卫生资源配置与经济协同发展。

关键词：天津卫生资源配置经济发展耦合协调

脑卒中患者健康行为促进与障碍因素的质性研究

在线全文

学校读者我要写书评

暂无评论

中华行为医学与脑科学杂志 2024年第1期33卷 27-31页

作者：张孟羽郭丽娜郭园丽杨彩侠雷小雨张格格刘延锦郑州大学护理与健康学院郑州450001 郑州大学第一附属医院神经内科国家高级卒中中心郑州450052 郑州大学第一附属医院护理部郑州450052

目的探讨脑卒中患者健康行为的促进与障碍因素。方法采用目的抽样法,于2022年9月至2023年3月对16例脑卒中患者进行面对面半结构式访谈。根据理论域框架(theoretical domain framework,TDF)设计访谈提纲,运用定向内容分析法和归纳法分析... 详细信息

目的探讨脑卒中患者健康行为的促进与障碍因素。方法采用目的抽样法,于2022年9月至2023年3月对16例脑卒中患者进行面对面半结构式访谈。根据理论域框架(theoretical domain framework,TDF)设计访谈提纲,运用定向内容分析法和归纳法分析转录的文字资料并从中提炼主题。以TDF作为编码框架,将提炼的主题合并到最相关的域中,根据每个理论域中主题的数量、主题间的关系来确定理论域与脑卒中患者健康行为的对应关系。结果本研究确定了影响脑卒中患者健康行为的9个理论域:知识、技能、动机和目标、社会影响、社会/职业认同、环境与资源、能力信念、结果信念、行为调节。结论脑卒中患者健康行为复杂,受多种因素的影响,本研究所识别出的9个理论域将为今后脑卒中患者健康行为干预方案的制定提供依据。

关键词：脑卒中健康行为质性研究理论域框架

A Multi-strategy Improved Snake Optimizer Assisted with Population Crowding Analysis for Engineering Design Problems

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第3期21卷 1567-1591页

作者： lei Peng Zhuoming Yuan Guangming Dai Maocai Wang Jian Li Zhiming Song xiaoyu Chen School of Computer Science China University of GeosciencesWuhan430074China Hubei Key Laboratory of Intelligent Geo-Information Processing China University of GeosciencesWuhan430074China China Astronautics Standards Institute Beijing100071China

Snake Optimizer(SO)is a novel Meta-heuristic Algorithm(MA)inspired by the mating behaviour of snakes,which has achieved success in global numerical optimization problems and practical engineering ***,it also has certain drawbacks for the exploration stage and the egg hatch process,resulting in slow convergence speed and inferior solution *** address the above issues,a novel multi-strategy improved SO(MISO)with the assistance of population crowding analysis is proposed in this *** the algorithm,a novel multi-strategy operator is designed for the exploration stage,which not only focuses on using the information of better performing individuals to improve the quality of solution,but also focuses on maintaining population *** boost the efficiency of the egg hatch process,the multi-strategy egg hatch process is proposed to regenerate individuals according to the results of the population crowding *** addition,a local search method is employed to further enhance the convergence speed and the local search *** is first compared with three sets of algorithms in the CEC2020 benchmark functions,including SO with its two recently discussed variants,ten advanced MAs,and six powerful CEC competition *** performance of MISO is then verified on five practical engineering design *** experimental results show that MISO provides a promising performance for the above optimization cases in terms of convergence speed and solution quality.

关键词： Snake optimizer Multi-strategy Population crowding analysis Engineering design problem

Determination of Hexavalent Chromium in Refractories by Diphenylcarbazide Spectrophotometry

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

China's Refractories 2021年第3期30卷 28-32页

作者： FU Yuanyuan HAN Junhua CAO Haijie lei xiaoyu HAN Dan XU Xiaoying CISDI Engineering Co. Ltd.Chongqing 400000China Sinosteel Luoyang Institute of Refractories Research Co. Ltd.Luoyang 471039China

The high chrome refractories were crushed,ground into powder and sampled.A mixture solution of sodium carbonate and sodium hydroxide was used to extract the powder *** extracted solution from the samples was mixed and reacted with diphenylcarbazide to form colored *** hexavalent chromium content in the samples was determined by *** effects of the extracting conditions,the color reagent reaction conditions,the sample mass,the working curve and the trivalent chromium coexistence on the results were *** experiments about determination,recovery and precision were carried *** relative standard deviation was less than 5%and the recovery rate was 98%-104%.

关键词： refractories hexavalent chromium spectrophotometry