全文获取类型
收费全文 | 77070篇 |
免费 | 6358篇 |
国内免费 | 3300篇 |
专业分类
电工技术 | 2672篇 |
技术理论 | 5篇 |
综合类 | 5580篇 |
化学工业 | 17158篇 |
金属工艺 | 7307篇 |
机械仪表 | 5018篇 |
建筑科学 | 4770篇 |
矿业工程 | 2904篇 |
能源动力 | 1973篇 |
轻工业 | 8294篇 |
水利工程 | 1297篇 |
石油天然气 | 3366篇 |
武器工业 | 598篇 |
无线电 | 3415篇 |
一般工业技术 | 6823篇 |
冶金工业 | 6564篇 |
原子能技术 | 461篇 |
自动化技术 | 8523篇 |
出版年
2024年 | 331篇 |
2023年 | 927篇 |
2022年 | 1739篇 |
2021年 | 2145篇 |
2020年 | 2460篇 |
2019年 | 1878篇 |
2018年 | 1652篇 |
2017年 | 2088篇 |
2016年 | 2481篇 |
2015年 | 2629篇 |
2014年 | 4662篇 |
2013年 | 4934篇 |
2012年 | 5618篇 |
2011年 | 5922篇 |
2010年 | 4283篇 |
2009年 | 4393篇 |
2008年 | 3788篇 |
2007年 | 4906篇 |
2006年 | 4717篇 |
2005年 | 4100篇 |
2004年 | 3502篇 |
2003年 | 3086篇 |
2002年 | 2647篇 |
2001年 | 2276篇 |
2000年 | 1888篇 |
1999年 | 1560篇 |
1998年 | 1196篇 |
1997年 | 933篇 |
1996年 | 875篇 |
1995年 | 676篇 |
1994年 | 579篇 |
1993年 | 376篇 |
1992年 | 340篇 |
1991年 | 266篇 |
1990年 | 176篇 |
1989年 | 145篇 |
1988年 | 119篇 |
1987年 | 73篇 |
1986年 | 59篇 |
1985年 | 43篇 |
1984年 | 41篇 |
1983年 | 33篇 |
1982年 | 18篇 |
1981年 | 19篇 |
1980年 | 26篇 |
1979年 | 13篇 |
1977年 | 14篇 |
1961年 | 7篇 |
1959年 | 8篇 |
1951年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Cathy Lawson Douglas C. Montgomery 《Quality and Reliability Engineering International》2006,22(8):971-984
Variation exists in all processes. Significant work has been done to identify and remove sources of variation in manufacturing processes resulting in large returns for companies. However, business process optimization is an area that has a large potential return for a company. Business processes can be difficult to optimize due to the nature of the output variables associated with them. Business processes tend to have output variables that are binary, nominal or ordinal. Examples of these types of output include whether a particular event occurred, a customer's color preference for a new product and survey questions that assess the extent of the survey respondent's agreement with a particular statement. Output variables that are binary, nominal or ordinal cannot be modeled using ordinary least‐squares regression. Logistic regression is a method used to model data where the output is binary, nominal or ordinal. This article provides a review of logistic regression and demonstrates its use in modeling data from a business process involving customer feedback. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
62.
介绍了研制出其性能达国际先进公司同类产品水平的塑封双列直插式光耦合器的工作原理和提高绝缘耐压的技术难点,从引线框架设计、加工精度控制、内包封材料选型、理想内包封形状控制、塑封气密性的实现、环境条件的完善等方面讨论了提高绝缘耐压的设计和工艺要点。 相似文献
63.
64.
在当今企业环境日益复杂而活跃的背景条件下,企业需要不断进行重组和迅速转型。这要求企业要具备更强的适应性和更高的灵活性。为了确保实现这些动态的要求,企业必须制定和实施新型的组织形式。本文介绍过程链管理——一种面向过程进行转型的工具。本文首先简要说明了过程链管理应用的工具、过程链管理的任务和构造。它的出发点是由行动、结构、资源、和指挥所组成的过程链管理。在第二步骤中,重点阐述了客户取向这个过程链管理中最重要的取向量。总体来说,整个价值创造链及与此相关的内部交换关系都具有重要意义。在对过程链管理的方法进行了说明以后,提出了一个应用实例,该实例不仅描述了垂直重构,也对水平重构进行了描述。 相似文献
65.
This report summarizes the panel held at the 109th Annual Convention, American Psychological Association, August 26, 2001, San Francisco. The chair was William Glover and the speakers were Samuel Gerson, Karen Maroda, and Andre Patsalides. The invited symposium was directed at discussing different perspectives related to the presence of desire in the analytic process. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
66.
Techniques for improving the reliability and maintainability of both nonrepairable and repairable items can be suggested by failure data analysis. It is shown that a given set of failure numbers leads to very different improvement strategies when the numbers are the times-between-successive-failures of one or more repairable items, rather than the times-to-failure of nonrepairable items. Since this should have been obvious more than 50 years ago, at the onset of formal reliability engineering activities, several reasons are proffered for the widespread and protracted misinterpretation of even the most basic—and simple!—conceptual and practical differences between nonrepairable and repairable items. 相似文献
67.
According to Carl Jung, a person's symptoms occur as a result of the psyche's creative attempt to self-regulate. These symptoms are viewed as the symbol-making function of the psyche. Music therapy as a therapeutic tool is also viewed as having a symbol-making function in that the physical act of making music involves conceptualizing one's symptoms into sounds. The sound serves as a musical symbol of the symptom. The myth of Orpheus is offered as an example of how early man amplified the creative potential contained in music to heal from life's woes. The Orphic archetype illustrates that music serves as a medium for healing and as an expression of Self. That psyche can be healed by music is a reminder of the connection between music therapy and the myth of Orpheus. In using the therapeutic tool of music one can transcend, through the symbol making process inherent in music therapy, the tension of opposites that are created at the crossroads of disease and wellness. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
68.
The vicissitudes of the Israeli-Palestinian peace process since 1967 are analyzed using attitudes and related concepts where relevant. The 1967 war returned the two peoples' zero-sum conflict around national identity to its origin as a conflict within the land both peoples claim. Gradually, new attitudes evolved regarding the necessity and possibility of negotiations toward a two-state solution based on mutual recognition, which became the building stones of the 1993 Oslo agreement. Lacking a commitment to a final outcome, the Oslo-based peace process was hampered by reserve options, which increased avoidance at the expense of approach tendencies as the parties moved toward a final agreement. The resulting breakdown of the process in 2000 produced clashing narratives, reflecting different anchors for judgment and classical mirror images. Public support for violence increased, even as public opinion continued to favor a negotiated two-state solution. Reviving the peace process requires mutual reassurance about the availability of a partner for negotiating a principled peace based on a historic compromise that meets the basic needs and validates the identities of both peoples. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
69.
70.