全文获取类型
收费全文 | 1755篇 |
免费 | 50篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 259篇 |
金属工艺 | 25篇 |
机械仪表 | 22篇 |
建筑科学 | 110篇 |
矿业工程 | 18篇 |
能源动力 | 24篇 |
轻工业 | 240篇 |
水利工程 | 21篇 |
石油天然气 | 14篇 |
无线电 | 46篇 |
一般工业技术 | 161篇 |
冶金工业 | 694篇 |
原子能技术 | 4篇 |
自动化技术 | 166篇 |
出版年
2023年 | 10篇 |
2022年 | 21篇 |
2021年 | 26篇 |
2020年 | 20篇 |
2019年 | 20篇 |
2018年 | 20篇 |
2017年 | 26篇 |
2016年 | 40篇 |
2015年 | 22篇 |
2014年 | 23篇 |
2013年 | 99篇 |
2012年 | 50篇 |
2011年 | 81篇 |
2010年 | 63篇 |
2009年 | 43篇 |
2008年 | 64篇 |
2007年 | 71篇 |
2006年 | 81篇 |
2005年 | 60篇 |
2004年 | 61篇 |
2003年 | 58篇 |
2002年 | 53篇 |
2001年 | 34篇 |
2000年 | 41篇 |
1999年 | 37篇 |
1998年 | 36篇 |
1997年 | 40篇 |
1996年 | 45篇 |
1995年 | 33篇 |
1994年 | 30篇 |
1993年 | 39篇 |
1992年 | 31篇 |
1991年 | 14篇 |
1990年 | 36篇 |
1989年 | 24篇 |
1988年 | 20篇 |
1987年 | 24篇 |
1986年 | 22篇 |
1985年 | 21篇 |
1984年 | 27篇 |
1983年 | 24篇 |
1982年 | 20篇 |
1981年 | 15篇 |
1980年 | 18篇 |
1978年 | 13篇 |
1977年 | 13篇 |
1976年 | 15篇 |
1975年 | 18篇 |
1974年 | 10篇 |
1969年 | 9篇 |
排序方式: 共有1807条查询结果,搜索用时 0 毫秒
1.
Beebe-Frankenberger Margaret; Bocian Kathleen M.; MacMillan Donald L.; Gresham Frank M. 《Canadian Metallurgical Quarterly》2004,96(2):204
A cohort of 2nd-grade students provided comparisons of academic and social competence based on school retention/promotion decisions. Sample groups were (a) retained, (b) at risk for retention, (c) special education, and (d) promoted. Findings suggested most children with academic deficiencies are identified by schools early and are sorted into educational treatments differing in intensity that represent a continuum of competence. The authors provide empirical evidence counter to the assumptions that retained students have the requisite ability to catch up and have more problem behaviors than other low-achieving students. The relevance of high-stakes test scores for promotion/retention decisions and the parallels between schools' implementation of retention policy and implementation of regulations for identifying children with disabilities are included in the discussion. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
2.
Vivien Walsh Robin Roy Margaret Bruce Stephen Potter 《Creativity & Innovation Management》1993,2(2):78-86
A series of studies of top European and other firms has revealed patterns of design management associated with commercial success. Firms that invest resources and professional expertise in product and industrial design in traditional and new industries have been commercially more successful than firms that pay less attention to these aspects of design. As an industry matures there is a shift in emphasis from design associated with technological innovation, to designs supporting technical improvements, and then to supporting user needs, fashion and product variants. These issues are illustrated through the history of the evolution of the bicycle. 相似文献
3.
Mohammed Saad Svetlana Cicmil Margaret Greenwood 《International Journal of Project Management》2002,20(8)
This paper attempts to broaden the analysis of the technology transfer phenomenon by refocusing research attention on the level of performance assessment of technology transfer projects. An holistic evaluation framework based on the considerations of an extended Project Life Cycle model is proposed to overcome some of the shortcomings of conventional approaches to project evaluation. This also reinforces the need for open systems thinking in assessing and managing risk of technology transfer projects. The discussion is based on two case studies which articulate the experiences with two integrated mechanisms of technology transfer used in Algeria from 1965 to 1990: turnkey and “product-in-hand”. The aim is to gain a better understanding of the processes of technology transfer and to contribute to the improvement of associated managerial practices in developing economies. 相似文献
4.
5.
Ronald R. Delyser Sheila S. Thompson Jerry Edelstein Corinne Lengsfeld Albert J. Rosa Paul J. Rullkoetter Robert Whitman Margaret Whitt 《工程教育杂志》2003,92(3):269-273
A team of faculty members at the University of Denver changed the learning environment in key courses in the Department of Engineering from predominately teacher centered to student centered. Through this funded project new grading methods were implemented, classrooms were renovated and wired with studio layouts to facilitate learning, the Engineering Circuits Laboratory was rewired and instrumented for automated data acquisition and reporting, and two new pedagogical approaches were developed. At the onset of the project, six goals were established related to student learning. The introduction of industry standard hardware and software provided students with unprecedented hands‐on experience and project related activities stimulated faculty innovations in other current and future courses. Assessment results indicate that the new grading system improved the clarity of expectations for students before assignments were given resulting in increased reported motivation for learning in many courses. Even though course GPAs did not always reflect higher achievement on graded work, faculty members firmly believe that deeper understanding was achieved because more complex material was assimilated. 相似文献
6.
This study tested a partial version of R. W. Lent, S. D. Brown, and G. Hackett's (1994) social-cognitive career theory model. Among 204 high school girls who attended science, math, and engineering (SME) career conferences, the authors used a 4-year longitudinal design to predict the choice of an SME college major and SME self-efficacy and outcome expectations in college. In addition, among students who had declared SME majors, variables assessed in high school and college were used to predict aspirations to become leaders in SME fields. The results generally provided empirical validation of the model. Regression analyses revealed that college SME outcome expectations were associated with plans to become a leader in an SME field. Implications for research and interventions are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
JW DiFiore DO Fauza R Slavin CA Peters JC Fackler JM Wilson 《Canadian Metallurgical Quarterly》1994,29(2):248-56; discussion 256-7
Infants with congenital diaphragmatic hernia (DH) and profound pulmonary hypoplasia are currently unsalvageable. The authors previously demonstrated that tracheal ligation (TL) accelerates fetal lung growth and reverses the pulmonary hypoplasia of fetal nephrectomy. The purpose of this study was to determine if the pulmonary hypoplasia of experimental DH could be similarly reversed and, if so, whether the resulting lungs would show better function than those of their DH counterparts. Eighteen fetal lambs were divided into three experimental groups of six animals each. In group 1, DH was created at 90 days' gestation. In group 2, DH was created at 90 days' gestation and TL performed during the same operation. Group 3 consisted of sham-operated controls. These animals were delivered near full-term, and their lungs analyzed by standard morphometric techniques. Ten additional fetal lambs were divided into two experimental groups of five animals each. In group 4, DH was created at 90 days' gestation. In group 5, DH was created at 90 days' gestation and TL performed 20 days later, at 110 days' gestation. These animals were pressure-ventilated via tracheostomy over a 2-hour period in which PaO2, PaCO2, and compliance were measured. Intratracheal pressure (ITP) was measured at the time of delivery in all groups. Upon retrieval, DH animals had abdominal viscera in the chest and small lungs; in contrast, DH/TL animals had the herniated viscera reduced from the chest by enlarged lungs. DH/TL lungs showed markedly increased growth, with significant increases in lung volume:body weight ratio (LV:BW; P = .0001), alveolar surface area (ALV.SA; P = .0001), and alveolar number (ALV#) (P = .0001) when compared with those of the DH or control group. This growth was associated with a normal maturation pattern based on histological appearance, normal airspace fraction, and normal alveolar numerical density. ITP in the DH/TL group was increased when compared with that of DH and control animals (P = .0001). Total lung DNA and protein were both elevated in the DH/TL animals (P = .0001). However, the DNA:protein ratio remained normal, suggesting lung growth had occurred through cell proliferation, not by hypertrophy. When ventilated over a range of settings, DH/TL lungs were more compliant (P = .0001) and achieved higher PaO2s (P < .003) and lower PaCO2s (P = .0001) than their DH counterparts. From these data, the authors conclude: (1) Experimental fetal DH produces hypoplastic lungs that are not capable of adequate gas exchange with conventional ventilation.(ABSTRACT TRUNCATED AT 400 WORDS) 相似文献
8.
9.
This study examined why Websites were co-linked using Canadian university Websites as the test set. Pages that co-linked to
these university Websites were located using Yahool. A random sample of 859 co-linking pages (the page that initiated the
co-link) was retrieved and the contents of the page, as well as the context of the link, were manually examined to record
the following variables: language, country, type of Website, and the reasons for co-linking. The study found that in over
94% of cases, the two co-linked universities were related academically; many of these cases (38%) showed a relationship specifically
in teaching or research. This confirms results, from previous quantitative studies, that Web co-links can be a measure of
the similarity or relatedness of sites being co-linked and that Web co-link analysis can thus be used to study relationships
among linked Websites. 相似文献
10.
This study examines the ways in which therapists function as attachment figures for patients. Patients in long-term psychoanalytic therapy answered questionnaires about their feelings about their therapists and their closest personal relationships. Components of attachment prominent in the therapeutic relationships were looking up to the therapist and feeling the therapist was responsive to emotional needs. Stronger attachment to therapists was associated with greater frequency and duration of therapy, a stronger working alliance, and greater security of the patients' attachment style, as well as with the gender of the patient and therapist. Using attachment theory to understand psychoanalytic relationships emphasizes the unique importance of a therapist to a patient and can offer new perspectives on both therapeutic and attachment processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献