313 research outputs found

    A Research on the Supply Chain Management Mechanism of Mobile Phone Industrial Clusters

    Get PDF
    自“供应链竞争”概念提出后,已经在诸多行业成为企业竞争的重要模式。近年来,智能手机与移动互联网的快速发展,手机产业成为产值高、创新快、竞争强度高的高新技术产业之一;但手机产业具有市场快速变化的特点,对手机供应链管理创新提出更高要求。在管理实践中,深圳近年来出现数量众多的平台型供应链管理企业,该类行业企业在经营效果(行业增长率、获得资本市场关注)方面获得较大成功。区域经济中比较成熟的多个主导性产业集群,为供应链管理模式的创新发展提供了现实环境,出现以高度专业化分工和高强度社会化协作为基础的供应链管理平台。 现有从供应链管理视角来分析产业集群效用机制的理论研究,一般从生态、绿色视角等来进行阐述。...Abstract Across a wide array of industries, “supply chain competition”, since its conceptual advent, has grown into a vital mode of business competition. Recent years has brought rapid advances to smartphones and mobile internet, placing mobile phone industry among high-tech industries, which features high output value, fast innovation and intense competition. As a norm, volatile cellphone market...学位:工商管理硕士院系专业:管理学院_工商管理硕士(高级管理人员工商管理硕士)学号:X201515603

    1984 Vol. 33 No. 3

    Get PDF
    https://engagedscholarship.csuohio.edu/lawpublications_gavel1980s/1009/thumbnail.jp

    Selective hydrogenolysis of sorbitol on Ni/La202CO3 catalysts

    Get PDF
    采用共沉淀法制各了具有协同稳定作用的Ni/La2O2CO3催化剂,用于山梨醇选择性氢解为小分子醇的研究。采用X射线衍射、氢气程序升温还原、C02程序升温脱附和扫描电镜对催化剂进行了表征。考察了不同配比Ni、La的加氢位点和碱性调控对山梨醇氢解产物的影响。结果表明,Ni、La摩尔比为2:3时,山梨醇转化率达到98.6%,C2~c3多元醇的产率达到43.8%,催化剂经2次反应后对山梨醇的转化率仍高达90%。探究了催化剂从酸性到碱性调变过程中,山梨醇氢解的产物分布,并提出了反应路径

    Development of a new cooling-based metering andcharging device and charging strategy analysis

    Get PDF
    介绍了焓差法冷量计量装置的原理和特点,对冷量计费进行了成本分析,并指出实际应用中影响计费的因素,预测了这种新型冷计量装置的市场及发展前景。Presents the principle and characteristics of the device based on enthalpy-difference method. Makes the cost analysis on the cooling-based charging. Points out the influencing factors on the metering and charging. Forecasts the market and development future of the new device.上海市科学技术委员会2004年中小企业创新基金资助项目(编号:0416h1124

    Study on landscape pattern changes in islands under stress of rapid urbanization

    Get PDF
    以厦门岛为例,通过一般景观格局分析指标和特殊景观格局分析指标,研究城市化进程中海岛生态景观格局的变化以及人工景观对自然景观的胁迫作用。结果显示:从1987年至2004年,人工景观对自然景观的胁迫作用迅速增加;厦门岛建成区占海岛面积的比例迅速增长,而斑块数量明显减少;厦门岛景观多样性迅速下降,同时破碎度指数和优势度迅速提高;受到海岸带开发活动影响,海岛岸线趋向平滑,海岛形状逐步趋向圆形;厦门岛人工景观对自然景观的胁迫程度逐步升高,城市化侵蚀指数也快速提高。Several common and special landscape indices were used to analyze the landscape pattern changes of Xiamen islands and the stress of artificial landscape to the natural landscapes during urbanization process.The results showed that the landscape pattern of Xiamen islands was altered observably and the stress of the artificial landscape to natural landscape were increased rapidly.The ratio of urban land area to the total islands area was increased and the number of the patches was decreased.The landscape diversity was decreased,meanwhile the landscape fragmentation and dominance were increased respectively.Because of the coastal reclamation,the island's coastal line tended to be simple and smooth,and the shape closed to a circle.The stress of the urban land to natural landscapes was aggravated with the urbanization invasion index increase.国家自然科学基金资助项目(40701059);中国科学院知识创新工程重要方向项目(KZCX2-YW-422-1);青年人才领域前沿项目(07l4081d10

    Relative risk factors of in-hospital death due to aortic dissection

    Get PDF
    目的分析主动脉夹层(Ad)患者院内死亡的相关危险因素。方法回顾性分析厦门市心脏中心2002年1月至2011年10月确诊急性Ad患者175例的临床资料,其中男性129例,女性46例,平均年龄(56.8±12.1)岁。按住院期间是否死亡进行分组,分为存活组(n=141)及死亡组(n=34),分析年龄、性别、既往病史、血压水平、症状、并发症及实验室指标与死亡的相关性,并用lOgISTIC回归分析危险因素与病死率的关系。结果与存活组比较,死亡组d-二聚体水平升高,意识障碍和心包填塞比例增加,手术或支架治疗比例减少,差异有统计学意义(P均<0.05)。lOgISTIC回归分析结果表明,d-二聚体水平升高(Or=1.325,95%CI:1.436~1.973,P=0.004)、伴意识障碍(Or=2.481,95%CI:1.302~3.203,P=0.003)、心包填塞(Or=7.726,95%CI:1.762~34.003,P=0.008)为Ad患者住院死亡的独立危险因素,手术或介入治疗(Or=0.101,95%CI:1.762~34.003,P=0.044)为保护因素。结论 Ad患者中d-二聚体明显升高,并发意识障碍、心包填塞者病死率高,临床上应予高度重视,依据病情采取手术或介入治疗有利于降低Ad患者的病死率。Objective To analyze the relative risk factors of in-hospital death in patients with aortic dissection(AD).Methods The clinical materials of patients with acute AD [n=175, male 129, female 46 and average age was(56.8±12.1)] were analyzed retrospectively from Jan.2002 to Oct.2011, and all patients were divided into survival group(n=141) and death group(n=34).The correlation between age, sex, medical history, blood pressure level, symptoms, complications or laboratory indexes and death was analyzed, and the relatio level increased, and the percentage of patients with consciousness disorder and cardiac tamponade increased and percentage of patients with surgery or stenting decreased(all P<0.05).The results of Logistic regression analysis showed that increased D-dinship between risk factors and mortality was analyzed by using Logistic regression analysis.ResultsCompared with survival group, in death group D-dimermer level(OR=1.325, 95%CI: 1.436~1.973, P=0.004), consciousness disorder(OR=2.481, 95%CI: 1.302~3.203, P=0.003) and cardiac tamponade(OR=7.726, 95%CI: 1.762~34.003, P=0.008) were independent risk factors of in-hospital death, and surgery or interventional treatment(OR=0.101, 95%CI: 1.762~34.003, P=0.044) were protective factors in AD patients.Conclusion Mortality is higher in patients with increased D-dimer level or complicating consciousness disorder and cardiac tamponade.Surgery and interventional treatment can reduce the mortality

    AGR2: A New Biomarker of Cancer Diagnosis

    Get PDF
    Agr2(AnTErIOr grAdIEnT-2)是一种分泌蛋白,广泛存在于前列腺、乳腺、肺和胰腺等腺体组织,并在这些腺体的肿瘤组织过量表达,与肿瘤细胞的存活、生长和转移相关。临床上,Agr2的表达与乳腺癌、前列腺癌、胰腺癌等癌症的发展和预后相关,被认为是一个很有前途的早期诊断和判定预后的标志性基因。该文就目前Agr2的研究现状,尤其是肿瘤相关的功能、机制和临床调查上的最新研究进展加以综述。AGR2 is a secreted protein and widely found in the prostate, breast, lung and pancreatic gland tissue.It has excessive expression in the tumor tissue of these glands and regulates tumor cell survival, growth and metastasis.Clinical expression of AGR2 in breast cancer, prostate cancer and pancreatic cancer is relative to the progress of tumor development.Thus, AGR2 is considered to be a promising biomarker for early diagnosis and prognosis.In this paper, we reviewed the current research status of AGR2, especially tumor related functions, clinical investigation and mechanisms.科技部国家重大基础研究计划项目(批准号:2010CB945004)资助的课题~

    Interface tracking and numerical simulation of micro-bubble controlled growth in micro restrained space

    Get PDF
    通过对微机电系统微流体器件中气泡生长实验结果的分析,考虑加热元表面液体微层的作用,将微气泡生长分为晶核形成、球形气泡、受侧壁挤压的气泡、沿微通道生长的气泡4个阶段,建立了矩形微通道内微气泡控制生长物理模型;采用Level Set Method模拟了矩形微通道内微气泡控制生长过程,获得了微气泡生长特性。数值模拟结果表明:微气泡初期生长速率较快,后期由于凝结率增大使生长速率减缓;液体温度、微通道宽度、微加热元宽度、加热电压等均对气泡生长始点和生长速率有显著影响。Based on the experimental results of micro-bubble controlled growth in MEMS(micro-electro-mechanical system)devices,the bubble growth process could be divided into four stages,namely,nucleating,spherical bubble,bubble restrained by lateral wall,bubble elongating along the channel.A physical model of micro-bubble growth in the rectangular microchannel was established by considering the micro layer of liquid in the heater.Numerical simulation of micro-bubble growth in the micro restrained space was performed by the Level Set Method and the characteristics of micro-bubble growth were obtained and analyzed.The simulated data showed that micro-bubble grew rapidly in the early stage but grew slowly in the late stage due to the increasing condensation rate on the interface.The results also indicated that the initial temperature of liquid,width of the microchannel,width of the microheater,and the heating voltage had remarkable effects on the bubble inception and bubble growth rate.国家自然科学基金项目(50406019);; 中国博士后科学基金项目(2004035669);; 江苏省博士后科学研究资助计划项目(苏人通2004[计]300号)~

    Mo/HZSM-5基甲烷非氧化脱氢芳构化催化剂的TPD及TPR研究

    Get PDF
    在Mo/HZSM-5基甲烷非氧化脱氢芳构化催化剂中加入促进剂ZnSO4,使该催化剂的活性和操作稳定性大为改善.对非促进的Mo/HZSM-5和促进型的Mo-ZnSO4/HZSM-5甲烷芳构化催化剂的NH3-TPD研究结果表明,促进剂ZnSO4的加入大大提高了催化剂表面的B-酸位浓度;这种B-酸位能较稳定地存在于催化剂表面,不易流失;催化剂表面高浓度B-酸位的稳定存在是其甲烷非氧化脱氢催化活性显著提高的关键因素.H2-TPR结果显示,过高的焙烧温度不仅不利于维持催化剂的表面酸性位(尤其是B-酸位)的浓度,还可能导致催化剂表面Mo物种的聚集和MoO3微晶的生成,使同一Mo负载量的催化剂中可还原至较低价态的Mo物种所占比例下降

    Human-induced disturbance on the understory plant diversity of urban forest:a case study of Xiamen

    Get PDF
    以厦门城市森林林下层植被为研究对象,重点研究台湾相思群落中林下灌草层植物多样性与土地利用类型、人为干扰程度之间的相关性;选用基于重要值的4种多样性指数,比较不同邻接用地类型城市森林群落多样性的差异;运用主成分分析、CCA排序以及多元回归等方法对城市森林灌草层植物多样性格局进行解释。结果表明:人为踩踏、垃圾堆积程度、人为挖掘、可到达容易程度等因子对厦门城市森林灌草层植物多样性分布格局有重要影响;厦门城市森林群落草本层β多样性沿着邻接商业用地、交通用地、工业用地、居住用地的方向逐渐增加,而灌木层β多样性沿着该环境梯度的方向却逐渐降低。This study is aimed at understanding anthropogenic impact on the understory plant diversity around the municipal area of Xiamen in Fujian Province,SE China.Four indexes were employed to differentiate the diversity of urban forests adjacent to different land use types.Principle Component Analysis(PCA)and Canonical Correspondence Analusis(CCA)methods were applied in our study.The results showed that human trample,dustheap,digging,accessibility and other factors have great influence on the understory plant diversity.Herb β diversity of urban forest increased along the land use gradient from commercial,transportation,industrial to residential,while shrub β diversity decreased gradually along this environment gradient.中国科学院知识创新工程重要方向资助项目(KZCX2-YW-422);厦门市科技计划资助项目(3502Z20072002);中国科学院知识创新工程青年人才领域前沿资助项
    corecore