电子商务环境下企业物流快速反应实现研究   总被引：1，自引：0，他引：1  

白秀艳 《科技管理研究》2010,30(22)

以供应链一体化下的电子商务物流为研究对象,对电子商务物流快速反应的内涵进行界定,总结了电子商务物流快速反应实现的瓶颈问题,针对这些瓶颈问题对电子商务物流快速反应能力的构成、影响因素进行了深入分析,得出制约电子商务物流快速反应能力的主要相关因素,提出电子商务物流快速反应的实现途径,为电子商务企业运作提供决策依据。  相似文献   

蜂群优化算法在带软时间窗的车辆路径问题中的应用   总被引：1，自引：0，他引：1  

杨进  马良 《预测》2010,29(6)

本文给出了带软时间窗的车辆路径问题的一种新的算法,蜂群算法.通过计算若干benchmark问题,并将结果与硬时间窗的目前最好解及蚁群算法的相应解作比较与分析,验证了算法的有效性.蜂群算法是刚刚起步的智能优化算法,目前国内外关于蜂群算法的文献较少,研究范围较窄,故本文不仅是拓宽蜂群算法应用范围的有效尝试,同时也给本身求解方法不多的软时间窗车辆路径问题提供了一种新解决方法.  相似文献   

常村矿N3-3掘进工作面通风风量计算及局扇选型     

刘进平  戴林超  卢志刚  王振刚 《中国科技纵横》2010,(24):28-28

为了保障井下工作面作业人员的身体健康和劳动安全，对常村矿N3—3掘进工作面风量分别按瓦斯涌出量、工作面人数、风速、局部通风机供风量及最小全压进行了计算，确定了工作面采用两台功率为45Kw的FBDN07．2型通风杌，并安设合适的局扇管理牌板．出风口距工作面不大于12m，风筒出风口必须上风筒圈，从而保证掘进巷道通风系统的正常运行，以达到安全生产的目的。  相似文献   

Psychometric Properties of IRT Proficiency Estimates     

Michael J. Kolen  Ye Tong 《Educational Measurement》2010,29(3):8-14

Psychometric properties of item response theory proficiency estimates are considered in this paper. Proficiency estimators based on summed scores and pattern scores include non-Bayes maximum likelihood and test characteristic curve estimators and Bayesian estimators. The psychometric properties investigated include reliability, conditional standard errors of measurement, and score distributions. Four real-data examples include (a) effects of choice of estimator on score distributions and percent proficient, (b) effects of the prior distribution on score distributions and percent proficient, (c) effects of test length on score distributions and percent proficient, and (d) effects of proficiency estimator on growth-related statistics for a vertical scale. The examples illustrate that the choice of estimator influences score distributions and the assignment of examinee to proficiency levels. In particular, for the examples studied, the choice of Bayes versus non-Bayes estimators had a more serious practical effect than the choice of summed versus pattern scoring.  相似文献   

生物接触氧化工艺在印染废水治理中的应用     

许健 《科技成果管理与研究》2010,(1):64-65

通过对某一针织印染厂生产废水处理工艺存在的问题进行研究和分析，对其废水处理工艺进行了改进，针对废水水质特点，采用“缺氧酸化＋生物接触氧化”相结合的工艺路线进行治理。运行结果表明，经该工艺处理后，废水中的COD、BOD，等指标均能达标排放，有利于企业的可持续发展。  相似文献   

Everyone's a Criminal? Reflections on Critical Reading in the Primary Classroom     

Vivienne Smith 《English in Education》1999,33(3):54-61

Calls for children to be taught to read critically become ever louder. This article asks what teaching for critical reading might look like in the primary school. It presents accounts of two group reading lessons from a Year 3 classroom. It examines the interactions that take place: the questioning of the teachers and the responses of the children. It suggests that where children are given the power to make meaning for themselves, they are more likely to learn to read critically than those who are not.  相似文献   

两种方式的健步走对边缘性血脂升高的中年男性血脂及肺通气功能的研究     

孔淑珍  张葆欣  李洁妮  韩国庆  温晓妮  张明军 《北京体育大学学报》2017,40(9):54-59

摘要：目的：探讨2种方式的健步走对边缘性血脂升高中年男性脑力劳动者血脂及肺功能的影响。方法：选取西安市3所高校从事脑力劳动的科研工作者，筛选出符合（血脂水平分层标准）边缘性血脂升高标准的受试者48人，随机分成匀速组和变速组各24人，实施为期12周的健步走。2组采用的运动强度为，匀速组在第二和第三个10～15 min以60﹪～70﹪HRmax为主，变速组以60﹪～70﹪HRmax和70﹪～80﹪HRmax为主，每周4次，每次40～60 min。重点监测受试者运动前、运动4周、运动12周的血脂六项（TC、TG、HDL-C、LDL-C、Apoa1/Apob）和肺通气功能指标（VC、FVC、FEV1/FVC﹪、MVV、VC/Kg）。结果：1）与运动前比较，运动6周，匀速组血脂及肺通气功能各指标无显著性变化（p>0.05）；变速组TC显著降低（p＜0.05），FEV1/FVC﹪、MVV、VC/Kg显著升高（p＜0.05）。运动12周，匀速组TC、TG显著降低（p＜0.05），FEV1/FVC﹪、MVV、VC/Kg显著增高（p＜0.05）；变速组血脂各指标（除Apoa1/Apob外）和肺功能指标（除FVC外）均有显著差异（p＜0.01或p＜0.05）。2）组间比较：运动6周，两组血脂与肺功能各指标无显著性差异（p>0.05）。运动12周，具有显著性差异（p＜0.05）的指标为HDL-C、LDL-C、MVV。3)在不同的运动周期，血脂和肺功能指标的变化幅度均有显著性变化，运动12周明显优于运动6周，变速组变化幅度优于匀速组。结论：1)匀速健步走运动12周，具有明显的调脂效果和提高肺通气功能；变速健步走运动6周，对血脂异常和肺通气功能有显著的改善。运动12周，调脂效果非常显著基本回归正常范围，肺功能显著提高。2)2种方式的健步走，强度较高的变速运动对血脂异常的调脂效果和肺通气功能的提高显著优于匀速运动。  相似文献   

弱非线性带壳球形颗粒复合体系中的高阶非线性介电响应     

顾利萍 《常熟理工学院学报》2008,22(8):42-45

利用微扰展开法讨论了任意阶弱非线性带壳球形颗粒复合体系（假定颗粒核组分的介电函数随场变化,表示为-↑εc=εc＋xc｜Ec｜^β的有效介电响应,导出了非稀释极限下三组分带壳球形颗粒体系的有效线性和有效（β＋1）次非线性系数的一般表示式．在部分共振条件下,三组分带壳球形颗粒复合体系可以等效成两组分实心球形颗粒复合体系,但是三组分体系的有效非线性系数兄比两组分体系增强了1/λ^β＋1。  相似文献   

Enhancing cellular immune response to HBV M DNA vaccine in mice by codelivery of interleukin-18 recombinant     

陈建忠  朱海红  刘克洲  陈智 《浙江大学学报(A卷英文版)》2004,5(4):467-471

Objective: To investigate the effect of interleukin-18 (IL-18) on immune response induced by plasmid encoding hepatitis B virus middle protein antigen and to explore new strategies for prophylactic and therapeutic HBV DNA vaccines. Methods: BALB/c mice were immunized with pCMV-M alone or co-immunized with pcDNA3-18 and pCMV-M and then their sera were collected for analysing anti-HBsAg antibody by ELISA; splenocytes were isolated for detecting specific CTL response and cytokine assay in vitro. Results: The anti-HBs antibody level of mice co-immunized with pcDNA3-18 and pCMV-M was slightly higher than that of mice immunized with pCMV-M alone, but there was not significantly different (P>0.05). Compared with mice injected with pCMV-M, the specific CTL cytotoxity activity of mice immunized with pcDNA3-18 and pCMV-M was significantly enhanced (P<0.05) and the level of IFN-γ in supernatant of splenocytes cultured with HBsAg in vitro was significantly elevated (P<0.05) while the level of IL-4 had no significant difference (P>0.05). Conclusion: The plasmid encoding IL-18 together with HBV M gene DNA vaccines may enhance specific TH1 cells and CTL cellular immune response induced in mice, so that IL-18 is a promising immune adjuvant.  相似文献   

Dynamic response analysis of a moored crane-ship with a flexible boom   总被引：3，自引：0，他引：3  

Hui-li Ren  Xue-lin Wang  Yu-jin Hu  Cheng-gang Li 《浙江大学学报(A卷英文版)》2008,9(1):26-31

The dynamic response of moored crane-ship is studied. Governing equations for the dynamic response of a crane-ship coupled with the pendulum motion of the payload are derived based on Lagrange＇s equations. The boom is modeled based on finite element method, while the payload is modeled as a planar pendulum of point mass. The dynamic response was studied using numerical method. The calculation results show that the large-amplitude responses occur at wave periods near the natural period of the payload. Load swing angle is smaller for crane-ship with flexible boom, in comparison with rigid boom. The ship surge motions have large vibrations for crane-ship with flexible boom, which were not observed for a rigid boom. The analysis identifies the significance of key parameters and reveals how the system design can be adjusted to avoid critical conditions.  相似文献