零散货物装载的一种快速算法     

马士华  刘小群 《预测》2005,24(2):64-67,63

研究了零散货物的装载问题。根据待装货物体积、重量与货车客积、载重的相对关系，将货物分为两类。对于不同货物类型的单车装载问题，优先考虑其主要约束目标，而对其他目标则适时调整。对于货物足够多的多车装载问题，关键是按照货物的类型确定不同的装车顺序。对于货车足够多的多车装载问题，则利用上次循环得到的解，对下一次的装车次序进行调整，使解不断趋于优化。  相似文献   

SciFinder Scholar与CrossFire Gmelin/Beilstein的比较分析     

孙君  陈陶 《现代情报》2007,27(9):149-151

SeiFinder Scholar和Cross Fire Gmelin／Beilstein数据库是化学化工厦相关学科领域最重要的两大数据库。作者通过对两个数据库在基本情况、检索方法、检索功能和检索结果方面的对比分析，认为两个数据库在功能上都很强大，又各具特色。在科学研究中缺一不可。  相似文献   

Effect of antimalarials treatment on rat liver lysosomal function—Anin vivo study     

Samir P. Patel  Subhash D. Katewa  Surendra S. Katyare 《Indian journal of clinical biochemistry : IJCB》2005,20(1):1-8

Effects of treatmentin vivo with the antimalarials:chloroquine (CQ), primaquine (PQ) and quinine(Q) on lysosomal enzymes and lysosomal membrane integrity were examined. Treatment with the three antimalarials showed an apparent increase in the membrane stability. CQ treatment resulted in increase in both the ‘free’ and ‘total’ activities of all the enzymes i.e. acid phosphatase, RNase II, DNase II and cathepsin D. PQ treatment lowered the ‘free’ and ‘total’ activities of acid phosphatase and cathepsin D, but the DNase II activities increased. Treatment with Q resulted in increased ‘free’ and ‘total’ activities of RNase II and DNase II. While ‘free’ activities of acid phosphatase and cathepsin D were low; the ‘total’ activities increased significantly. Our results suggest that a generalized increase in free nucleases activities following prolonged treatment with antimalarials may lead to cell damage and/or necrosis.  相似文献   

R&D国际化的国内外研究评述     

龚健  黄鲁成 《研究与发展管理》2003,15(5):1-6

R&D国际化是经济全球化不断发展的必然要求.通过对R&D国际化的国内外研究现状进行评述,总结了近年来国内外开展R&D国际化研究的特点及不足,提出我国今后努力的方向.  相似文献   

The discrete charm of the bourgeoisie: quantum and continuous perspectives on innovation and growth     

Gerald Silverberg 《Research Policy》2002,31(8-9)

This paper discusses the relative merits of discrete versus continuous perspectives on innovation, technical change, and economic growth. It discusses the innovation time series literature in some detail to extract the continuous and clustering properties of the historical record on innovation. It then proposes a mosaic/avalanche model based on percolation theory and self-organized criticality to address this question.  相似文献   

硅微电子技术物理极限对策探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

王占国 《中国科学院院刊》2007,22(6):480-485

根据国际半导体技术蓝图(ITRS)发布的未来半导体工艺技术预测,2016年世界集成电路主流工艺线宽为22纳米,2022年达到10纳米。届时,以硅为基础的微电子技术发展所遵循的摩尔定律将不再适用;为此,必须发展基于全新原理的新技术,以满足人类不断增长的对信息量的需求。本文首先介绍硅材料国内、外的发展现状与趋势,进而讨论后摩尔时代的微电子技术发展可能采取的对策,最后展望基于全新原理的纳米电子、分子电子、光计算和量子信息技术的发展前景。  相似文献   

对提高我国企业技术创新能力的思考     

孙晓宁  李军训  田伟 《技术与创新管理》2007,28(3):110-111

从产品、资金、R＆D投入的角度阐述了我国企业技术创新能力低下的主要原因，对影响我国企业技术创新能力提高的4个主要因素：科技与经济存在“两张皮”、缺乏技术创新的动力、技术引进与消化、人员素质进行了重点分析，结合国际大型企业经验，提出了提高我国企业技术创新能力的相应对策。  相似文献   

书刊附盘管理初探   总被引：4，自引：0，他引：4  

邵小玲  尹屹  严红 《情报理论与实践》2004,27(3):296-297

阐述了书刊附盘的特点及管理模式，探讨了我馆在书刊附盘的加工、著录和管理等方面的具体做法，并指出书刊附盘管理中有待解决的问题。  相似文献   

不同的分组方法对赫斯特指数的影响     

梁静溪  陈昭 《中国软科学》2004,(9):135-139

赫斯特指数的计算过程需要对研究的时间序列数据进行分组,而不同的分组情况对赫斯特指数会产生不同的影响。以深圳股票市场1997-2001年的日收盘成分指数为例,表明组内数据为15个左右时计算的赫斯特指数的可信度较高,但不同的分组方法却不会使结论发生质的变化,仅是量的改变。  相似文献   

Evaluating the NASA small business innovation research program: preliminary evidence of a trade-off between commercialization and basic research     

Robert B Archibald  David H Finifter 《Research Policy》2003,32(4):605-619

In 1982, the Small Business Innovation Development Act established the small business innovation research (SBIR) program. This program reserves a percentage of federal agencies’ extramural R&D budgets for research projects conducted by small businesses. When this Act was reauthorized in 1992, the selection criteria for funding dramatically increased the likelihood of funding for projects that promised to lead to commercial success. Using data from a survey of the SBIR program award recipients at NASA Langley Research Center, we address three questions about this change: (i) was there a shift to projects with more commercial potential? (ii) did these projects experience higher rates of commercial success? and (iii) was there a reduction in basic research accompanying the increased commercial success? Our analysis suggests, the answer to all three of these questions is ‘yes’.  相似文献