全文获取类型
收费全文 | 5587篇 |
免费 | 569篇 |
国内免费 | 452篇 |
专业分类
电工技术 | 153篇 |
综合类 | 810篇 |
化学工业 | 597篇 |
金属工艺 | 272篇 |
机械仪表 | 237篇 |
建筑科学 | 769篇 |
矿业工程 | 139篇 |
能源动力 | 95篇 |
轻工业 | 389篇 |
水利工程 | 308篇 |
石油天然气 | 222篇 |
武器工业 | 39篇 |
无线电 | 242篇 |
一般工业技术 | 490篇 |
冶金工业 | 719篇 |
原子能技术 | 32篇 |
自动化技术 | 1095篇 |
出版年
2024年 | 38篇 |
2023年 | 110篇 |
2022年 | 209篇 |
2021年 | 226篇 |
2020年 | 208篇 |
2019年 | 194篇 |
2018年 | 166篇 |
2017年 | 185篇 |
2016年 | 205篇 |
2015年 | 187篇 |
2014年 | 330篇 |
2013年 | 342篇 |
2012年 | 335篇 |
2011年 | 427篇 |
2010年 | 320篇 |
2009年 | 347篇 |
2008年 | 350篇 |
2007年 | 408篇 |
2006年 | 343篇 |
2005年 | 308篇 |
2004年 | 266篇 |
2003年 | 209篇 |
2002年 | 176篇 |
2001年 | 151篇 |
2000年 | 102篇 |
1999年 | 81篇 |
1998年 | 62篇 |
1997年 | 41篇 |
1996年 | 42篇 |
1995年 | 31篇 |
1994年 | 42篇 |
1993年 | 24篇 |
1992年 | 16篇 |
1991年 | 11篇 |
1990年 | 13篇 |
1989年 | 19篇 |
1988年 | 6篇 |
1987年 | 8篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 9篇 |
1981年 | 3篇 |
1966年 | 3篇 |
1964年 | 3篇 |
1962年 | 3篇 |
1961年 | 4篇 |
1959年 | 3篇 |
1957年 | 3篇 |
1956年 | 3篇 |
1955年 | 3篇 |
排序方式: 共有6608条查询结果,搜索用时 15 毫秒
71.
从武汉钢铁股份有限公司对客户认识上的三次飞跃入手,从公司赢得客户的具体做法、与客户接触、处理客户的投诉、改进与客户的关系等四个方面论述了武汉钢铁股份有限公司以客户为中心,不断更新认识观念、改进服务技术、提高服务能力,从而赢得客户,与客户建立紧密的相互关系。 相似文献
72.
73.
Reciprocal Associations Between Adolescent Sexual Activity and Quality of Youth-Parent Interactions.
The authors examined differences in adolescents' relationships with their parents before and after adolescent first sexual activity. Participants were 13,570 members of the core sample of the National Longitudinal Survey of Adolescent Health (Add Health) Waves 1 and 2. Path analyses examined changes in parent-adolescent closeness, shared activities, and problem-focused interactions associated with changes in sexual activity separately for sons and daughters and for mothers and fathers. Race, religion, age, urbanicity, and parents' education were controls. Results confirm that increased problem-focused interactions and decreased parental closeness and shared activities both precede and follow adolescent sexual activity. Maintaining positive parental relations after adolescent first sexual activity is discussed as a means to reduce risks associated with sex. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
74.
Two types of attribution believed to predict anger in married couples were investigated. Wives' anger was expected to be predicted by event-dependent attributions, appraisals based on the unique aspects of one's current situation. Husbands' anger was expected to be predicted by schematic attributions, appraisals based on one's global sentiment in the relationship. Seventy-seven recently married couples attended 2 assessment sessions, and each couple identified 4 incidents pertaining to unresolved relationship issues. Participants rated their event-dependent attributions and their anger prior to a discussion for each incident. They also completed questionnaires regarding schematic attributions and relationship sentiment. Hierarchical linear modeling was used to distinguish between the 2 types of attribution. Strong support was found for the expected gender differences. Results suggest that wives are particularly attentive to the details of interpersonal interaction. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
75.
This article presents strategies for treating child abuse survivors based on a theory of interpersonal protection that integrates research in attachment, developmental psychopathology, trauma, dissociation, and experiential psychotherapy. The theory proposes that abused children do not form internal working models of an effective protector, with the result that they have difficulty defending themselves against interpersonal aggression and internal self-criticism; thus, a core psychotherapy task is to help survivors develop adequate representations of protection. The article provides case examples and describes interventions targeting the client-therapist relationship, other client relationships, client self-criticism, and traumatic memories. The author discusses dissociation as an intervention marker; client verbal and nonverbal feedback to therapist interventions; subselves and internal roles; the "inner critic"; guided imagery, role-plays, and dramatic enactment methods; and directions for future research. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
76.
Components of the therapeutic process have been shown to be moderately strong predictors of change in patients' global interpersonal functioning during therapy. The authors sought to extend this research by examining how the therapeutic process in time-limited dynamic psychotherapy related to change in patients' perceptions of a specific relationship as rated by the Structural Analysis of Social Behavior. Results showed that ratings of therapist warmth at Session 3 predicted increased warmth and decreased hostility in patient behavior at posttreatment. Therapist warmth at Session 16 was predictive of a decrease in submissive behavior by patients toward their significant other. The importance of the association between the therapeutic process and patients' important interpersonal relationships is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
77.
P. P. Lepikhin 《Strength of Materials》2005,37(6):573-583
Based on the theory of simple hardening materials with elastoplastic behavior, the general constitutive relationships of the
deformation theory of plasticity are mathematically strictly constructed for arbitrary continuous, piece-wise continuously
differentiable deformation trajectories, any strains and symmetry types of the material properties. Two conditions under which
this is possible are considered. The approaches to a strict specialization of general constitutive relationships of the deformation
theory of plasticity have been developed by imposing restrictions on the material strains, deformation processes and properties.
In this case, the restrictions on the properties of materials formalize the data obtained in the experimental investigations.
A series of both new and known constitutive relationships have been constructed that are arranged into a hierarchy according
to the level of complexity of the response to deformation. The area of applicability of the derived physical equations has
been defined. Special attention has been given to the modeling of finite and infinitesimal strains of isotropic materials.
__________
Translated from Problemy Prochnosti, No. 6, pp. 35 – 49, November – December, 2005. 相似文献
78.
随着数字影像技术的迅猛发展,数字影像数据得到快速累积,数字影像管理技术越来越受到重视;本文针对当前数字影像管理技术面临的问题,系统研究了对象-关系数据库大对象(LOB)流式处理方法在数字影像管理技术上的应用,并结合实例,介绍了具体实现方法。 相似文献
79.
γ辐照对聚己内酯性能的影响 总被引:3,自引:0,他引:3
研究了不同分子量的聚己内酯的辐照特性,聚已内酯(PCL)的分子量越大,辐射交联所需的凝胶化剂量越低。结果表明,溶胶分数s √s与I/D的关系很好地符合Charlesby-Pinner关系式,说明PCL的辐射交联属于无规交联。辐射交联对PCL的力学性能影响显著,辐射剂量越大,拉伸强度和断裂伸长率下降越多,但分子量较高的PCL的抗张强度受辐射剂量的影响较小。动态力学分析(DMA)分析表明,聚己内酯辐照交联后的弹性模量和耐热性能显著提高。 相似文献
80.
Although the application of segmentation and predictive modeling is an important topic in the database marketing (DBM) literature, no study has yet investigated the extent of adoption of these techniques. We present the results of a Dutch survey involving 228 database marketing companies. We find that managers tend to rely on intuition and on the long-standing methods RFM and cross-tabulation. Our results indicate that the application of segmentation and response modeling is positively related to company and database size, frequency of customer contact, and the use of a direct channel of distribution. The respondents indicate that future research should focus on models applicable for Internet marketing, long-term effects of direct marketing, irritation from direct marketing offers, and segmentation and predictive modeling techniques. 相似文献