全文获取类型
收费全文 | 2845篇 |
免费 | 157篇 |
国内免费 | 62篇 |
专业分类
电工技术 | 23篇 |
综合类 | 97篇 |
化学工业 | 839篇 |
金属工艺 | 29篇 |
机械仪表 | 38篇 |
建筑科学 | 53篇 |
矿业工程 | 15篇 |
能源动力 | 88篇 |
轻工业 | 457篇 |
水利工程 | 25篇 |
石油天然气 | 29篇 |
无线电 | 85篇 |
一般工业技术 | 140篇 |
冶金工业 | 683篇 |
原子能技术 | 107篇 |
自动化技术 | 356篇 |
出版年
2024年 | 10篇 |
2023年 | 53篇 |
2022年 | 195篇 |
2021年 | 218篇 |
2020年 | 99篇 |
2019年 | 80篇 |
2018年 | 69篇 |
2017年 | 65篇 |
2016年 | 101篇 |
2015年 | 85篇 |
2014年 | 116篇 |
2013年 | 166篇 |
2012年 | 192篇 |
2011年 | 161篇 |
2010年 | 165篇 |
2009年 | 162篇 |
2008年 | 101篇 |
2007年 | 142篇 |
2006年 | 123篇 |
2005年 | 115篇 |
2004年 | 98篇 |
2003年 | 90篇 |
2002年 | 74篇 |
2001年 | 53篇 |
2000年 | 40篇 |
1999年 | 31篇 |
1998年 | 24篇 |
1997年 | 31篇 |
1996年 | 15篇 |
1995年 | 19篇 |
1994年 | 13篇 |
1993年 | 18篇 |
1992年 | 15篇 |
1991年 | 10篇 |
1990年 | 14篇 |
1989年 | 9篇 |
1988年 | 4篇 |
1987年 | 13篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 6篇 |
1966年 | 3篇 |
1963年 | 3篇 |
1961年 | 6篇 |
1957年 | 2篇 |
1955年 | 6篇 |
1954年 | 2篇 |
排序方式: 共有3064条查询结果,搜索用时 16 毫秒
201.
The authors discussed to what degree testimony from social science and mental health experts (psychologists, psychiatrists, social workers, therapists, others) meets admissibility requirements expressed by the U.S. Supreme Court in Daubert (1993), Joiner ( General Electric Co. v. Joiner , 1997) and the recent Kumho (1999) decision. They reviewed data on Daubert/Kumho indicia of reliability using 2 exemplar areas of mental health testimony: psychodiagnostic assessment by means of the Rorschach and other "projective" assessment techniques and the diagnoses of posttraumatic stress disorder and multiple personality disorder (dissociative identity disorder). They concluded that some testimony offered by mental health professionals relating to these concepts should not survive scrutiny under the framework of Daubert , Joiner , and Kumho . (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
202.
Westen Drew; Nakash Ora; Thomas Cannon; Bradley Rebekah 《Canadian Metallurgical Quarterly》2006,74(6):1065
The relevance of attachment theory and research for practice has become increasingly clear. The authors describe a series of studies with 3 aims: (a) to validate measures of attachment for use by clinicians with adolescents and adults, (b) to examine the relation between attachment and personality pathology, and (c) to ascertain whether factor analysis can recover dimensions of attachment reflecting both interpersonal and narrative style. In 3 studies, experienced clinicians provided psychometric data using 1 of 4 attachment questionnaires (2 adolescent and 2 adult samples). Attachment dimensions predicted both personality pathology and developmental experiences in predictable ways. Factor analysis identified 4 dimensions that replicated across adolescent and adult samples on the basis of a combination of interpersonal and narrative indicators: secure, dismissing, preoccupied, and incoherent/disorganized. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
203.
The causes of learning disorders are numerous and, although some learning difficulties can be remedied by special educative measures only, many such problems, especially when they are more severe represent a disorder of the total personality. In such a case a diagnosis must be established by a team of different specialists. After a careful evaluation a treatment programme is planned and a choice is made among various specific therapies. Very often the treatment of learning disorders must take into account more or less important emotional factors. A combined approach of psychotherapy and remedial teaching is sometimes essential to attain some success in helping a child. Such a combination of treatments requires close cooperation between psychotherapist and special teacher. Their respective roles have to be frequently clarified and both gain in understanding of the child needs through mutual communication. Following the evolution of a child from two points of view demonstrates more and more clearly how the intellectual processes necessary for learning are subject to inhibiting patterns that are observed in neurotic defense mechanisms against emotional conflicts. In some instances this practical knowledge would be necessary to understand why a child does not profit from remedial measures and to determine how new techniques are to be used to help him. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
204.
Despite the importance of reducing work-related musculoskeletal disorders, there appears to have been little evaluation of routine ergonomics consultancy interventions aimed at reducing risks leading to these conditions. In many instances, the effectiveness of advice depends on organisations accepting and implementing measures recommended, involving changes of both individual and collective behaviour. Behaviour change theory, developed elsewhere, suggests that if change is to take place, recipients need to hold positive attitudes and beliefs relating to the desirable behaviour. To investigate the extent to which this is accommodated by current ergonomics consultancy practices, 14 ergonomics consultants were interviewed to explore the consultancy process from which recommendations are developed, exploring the factors that are assessed by consultants, perceived barriers to promoting change, and the extent to which evaluation of outcomes takes place. Consultants' recommendations generally focused on physical aspects of the work environment and did not take explicit account of employees' knowledge or attitudes. Little evaluation of outcomes was conducted by the consultants interviewed. Implications of these findings for improving the efficacy of interventions to reduce work-related musculoskeletal disorders within organisations are discussed. 相似文献
205.
Gallagher Dolores; Breckenridge James; Steinmetz Julia; Thompson Larry 《Canadian Metallurgical Quarterly》1983,51(6):945
This study examined the congruence between conventional cutoff scores on the Beck Depression Inventory (BDI) and selected diagnostic classifications of the Research Diagnostic Criteria in a sample of 102 elders seeking psychological treatment. Only 16.67% were misclassified by customary BDI cutoff scores. Minor Depressive Disorders were less clearly identified than Major Depressive Disorders or nondepressed status. Similar results were obtained in a second sample of elders not seeking treatment. Findings support the utility of the BDI as a screening instrument for identification of clinically depressed elders. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
206.
The purpose of this laboratory study was to evaluate the possible differences in motor strategies to a new standardized low-load repetitive work task in between healthy experienced workers and a reference group. Work task event duration, i.e. working rhythm, cutting forces, surface electromyographic (EMG) activity from four shoulder muscles, postural activity, and arm and trunk movements in 3D were recorded during low-load repetitive work simulation. The experienced group showed lower EMG activity and frequency contents (P<0.05), more abducted position of the upper arm and forward flexion of the trunk prior to work simulation (P<0.05), and increased arm and trunk range of motion (P<0.05) compared with the reference group. The results highlight that experienced butchers have a different motor strategy compared with a reference group, i.e. more variable form of coordination pattern. Furthermore, the initial implementation of a possible protective motor strategy by experienced workers might be a very important prognostic factor. 相似文献
207.
Smyth J 《Applied ergonomics》2003,34(1):39-43
The production processes at the BCM Airdrie site range from manual loading tasks in the manufacturing areas to high frequency packaging assembly tasks on the production lines. Both are jobs that are known to carry risk to musculoskeletal health, so an ergonomist was appointed to design and co-ordinate an ergonomics programme for the site to control these risks. This paper details the programme that has evolved to proactively manage musculoskeletal risks in the design of both new and existing equipment and processes. The ergonomics procedures described primarily involve the engineers from all areas of the factory, and the process for ergonomics involvement with engineering design projects is described. Shop-floor personnel involvement is considered to be an essential part of the programme and 'Ergonomics Champions' are being trained on the packing lines to monitor the risks that are sometimes introduced with the different designs of product packaging. 相似文献
208.
This study considered whether the distinction between core and peripheral criteria for behavioral addiction, previously drawn with respect to computing activities in general, applies in the specific area of Massively Multiplayer Online Game playing. Questionnaire items were administered over the Internet to 442 game players. Factor-analysis of the data supported the previous findings for computing in general. An addiction factor loaded on items tapping previously identified core criteria (conflict, withdrawal symptoms, relapse and reinstatement and behavioral salience) and a (non-pathological) engagement factor loaded on items tapping previously identified peripheral criteria (cognitive salience, tolerance and euphoria). Analysis of response frequencies supported the existence of a developmental process whereby peripheral criteria are met before core criteria. Players who might be considered addicted using a monothetic classification system involving only the core criteria were shown to spend a significantly greater amount of time playing per week than those endorsing only the peripheral criteria. It is concluded that the study supports the idea that it is inappropriate to use some of the previously used criteria for addiction when researching or diagnosing computer-related addictions. Implications of the present findings for Internet-mediated data collection methodologies are also discussed. 相似文献
209.
Nolen-Hoeksema Susan; Stice Eric; Wade Emily; Bohon Cara 《Canadian Metallurgical Quarterly》2007,116(1):198
The authors examined the reciprocal relations between rumination and symptoms of depression, bulimia, and substance abuse with longitudinal data from 496 female adolescents. Rumination predicted future increases in bulimic and substance abuse symptoms, as well as onset of major depression, binge eating, and substance abuse. Depressive and bulimic, but not substance abuse, symptoms predicted increases in rumination. Rumination did not predict increases in externalizing symptoms, providing evidence for the specificity of effects of rumination, although externalizing symptoms predicted future increases in rumination. Results suggest rumination may contribute to the etiology of depressive, bulimic, and substance abuse pathology and that the former two disturbances may foster increased rumination. Results imply that it might be beneficial for prevention programs to target this cognitive vulnerability. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
210.
This study examined the generalizability of direct and mediated links posited in objectification theory among internalization of sociocultural standards of beauty, body surveillance, body shame, and eating disorder symptoms with a sample of Deaf women. The study also examined the role of marginal Deaf cultural identity attitudes within this framework. Data from 177 Deaf women indicated positive relations among internalization, body surveillance, body shame, and eating disorder symptomatology. Consistent with tenets of objectification theory, body shame mediated the links of internalization and body surveillance with eating disorder symptoms. In addition, marginal Deaf identity attitudes (but not hearing, immersion, or bicultural attitudes) were linked uniquely with eating disorder constructs and had significant indirect relations through internalization with body surveillance, body shame, and eating disorder symptoms. Implications for practice and future research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献