全文获取类型
收费全文 | 1703篇 |
免费 | 119篇 |
国内免费 | 92篇 |
专业分类
电工技术 | 59篇 |
综合类 | 162篇 |
化学工业 | 70篇 |
金属工艺 | 25篇 |
机械仪表 | 135篇 |
建筑科学 | 295篇 |
矿业工程 | 52篇 |
能源动力 | 67篇 |
轻工业 | 110篇 |
水利工程 | 12篇 |
石油天然气 | 62篇 |
武器工业 | 7篇 |
无线电 | 141篇 |
一般工业技术 | 115篇 |
冶金工业 | 28篇 |
原子能技术 | 11篇 |
自动化技术 | 563篇 |
出版年
2024年 | 2篇 |
2023年 | 12篇 |
2022年 | 24篇 |
2021年 | 38篇 |
2020年 | 47篇 |
2019年 | 42篇 |
2018年 | 49篇 |
2017年 | 32篇 |
2016年 | 58篇 |
2015年 | 68篇 |
2014年 | 118篇 |
2013年 | 108篇 |
2012年 | 115篇 |
2011年 | 142篇 |
2010年 | 115篇 |
2009年 | 90篇 |
2008年 | 91篇 |
2007年 | 96篇 |
2006年 | 105篇 |
2005年 | 64篇 |
2004年 | 86篇 |
2003年 | 67篇 |
2002年 | 76篇 |
2001年 | 45篇 |
2000年 | 37篇 |
1999年 | 21篇 |
1998年 | 27篇 |
1997年 | 29篇 |
1996年 | 23篇 |
1995年 | 16篇 |
1994年 | 12篇 |
1993年 | 11篇 |
1992年 | 12篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1985年 | 2篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有1914条查询结果,搜索用时 500 毫秒
51.
52.
油气开发具有高投入、高风险的特点,应在全面进行石油地质和工程技术论证的基础上科学评估其实施风险。文中通过对理想的风险评价模型实现,分析油气开发项目在可预见周期内可能出现风险的概率,客观给出风险评价的结果.为科学决策提供依据,减少油气勘探开发风险,提高油气勘探效益。 相似文献
53.
Jim Spohrer Laura C. Anderson Norman J. Pass Tryg Ager Daniel Gruhl 《Journal of Grid Computing》2008,6(3):313-324
This paper is a first exploration of the relationship between service science and Grid computing. Service science is the study
of value co-creation interactions among entities, known as service systems. Within the emerging service science community,
service is often defined as the application of competences (resources) for the benefit of another. Grid computing is the study
of resource sharing among entities, known as virtual organizations, which solve complex business, societal, scientific, and
engineering problems. Within the Grid computing community, service is sometimes defined as protocols plus behavior. Both Grid
computing and service science are connecting academic, industry, government, and volunteer sector collaborators on a range
of projects including eScience, healthcare, environmental sustainability, and more. This paper compares and contrasts the
notions of resource, entity, service, interaction, and success criteria for the two areas of study. In conclusion, new areas
for collaborative inquiry are proposed. 相似文献
54.
Joseph A. Cazier Benjamin B. M. Shao Robert D. St. Louis 《Information Systems Frontiers》2007,9(5):515-529
This study explores how value congruence contributes to the formation of trust in e-businesses, and how trust and value congruence
influence consumers to share personal information. It is hypothesized that the perceived values of organizations regarding
moral, social, environmental and political causes can have an effect on the trusting beliefs of e-commerce consumers and their
willingness to disclose private personal information. A total of 775 subjects rated their perceived value congruence with
organizations, their trusting beliefs, and the types of information they would be willing to disclose. This study finds that
value congruence not only plays a role in mediating the trust of consumers for the organizations, but it also has a strong
effect on determining their willingness to disclose personal information. In some cases, the influence of value congruence
is greater than that of trust, even though trust has been touted in the literature as one of the most important factors in
e-commerce. This research expands prior work by using structural equation modeling to test the relative strength of the effect
of value congruence on each dimension of trust and the overall trust level, as well as its direct effect on behavioral intentions
in terms of information sharing for non-profit and for-profit organizations.
相似文献
Robert D. St. LouisEmail: |
55.
56.
57.
Visual C++以其方便的可视化集成编程环境,高效的代码实现功能,强大的基内库以及兼有低级语言可控制硬件操作的优点,成为一般工程项目的首选软件开发平台。涉及信号处理的实际工程常常需要处理复的数字信号,因此Visual C++下如何实现复数运算是工程技术中软件开发必须面对的问题。该文详细阐述了VisualC++中利用复数模板实现复数运算的方法,给出了一些基本复数运算的实现代码;并基于该方法实现了算法已知的一般复矩阵的奇异值分解(CSVD)运算,很好地满足了实际工程信号处理软件模块的需要,证明了该方法的正确性。发现了 Visual C++5.0和Visual C++6.0一个声明的复数模板函数在其标准C++库中没有具体实现,通过编写同名模板函数解决了这一问题。 相似文献
58.
《国际计算机数学杂志》2012,89(1):19-46
Speculative execution is one of the key issues to boost the performance of future generation microprocessors. In this paper, we introduce a novel approach to evaluate the effects of branch and value prediction, which allow the processor to execute instructions beyond the limits of control and true data dependences. Until now, almost all the estimations of their performance potential under different scenarios have been obtained using trace-driven or execution-driven simulation. Occasionally, some simple deterministic models have been used. We employ an analytical model based on recently introduced Fluid Stochastic Petri Nets (FSPNs) in order to capture the dynamic behavior of an ILP processor with aggressive use of prediction techniques and speculative execution. Here we define the FSPN model, derive the state equations for the underlying stochastic process and present performance evaluation results to illustrate its usage in deriving measures of interest. Our implementation-independent stochastic modeling framework reveals considerable potential for further research in this area using numerical solution of systems of partial differential equations and/or discrete-event simulation of FSPN models. 相似文献
59.
雷锋精神是中国共产党的精神坐标,它体现了社会主义精神文明的巨大感召力和文化穿透力,是时代精神的精华。在中国特色社会主义伟大实践中,大力弘扬雷锋精神不仅是人民和历史的选择,更是时代的呼唤。本文梳理了雷锋精神的历史资源和文化滋养,论述了雷锋精神的本质内涵和时代精神,并提出大力弘扬雷锋精神,积极推动社会主义核心价值体系建设,要切实做到:知与行的统一、广泛性与先进性的统一、长期性和有效性的统一。 相似文献
60.
本文针对矿山企业生产对象的特殊性,提出了成本管理和控制有着不同一般企业的特征,分析了传统矿山企业成本核算仅仅针对产品本身,成本管理只重视企业制造成本,不重视业务流程管理和成本管理平台的构建、企业设计成本以及企业弃置费用等相关问题,最后从整个企业价值链出发,提出了对矿山企业成本控制的相关建议及措施,为我国矿山企业提供高效的成本信息,培育矿山企业长期竞争优势。 相似文献