全文获取类型
收费全文 | 1870篇 |
免费 | 177篇 |
国内免费 | 127篇 |
专业分类
电工技术 | 35篇 |
综合类 | 135篇 |
化学工业 | 313篇 |
金属工艺 | 52篇 |
机械仪表 | 46篇 |
建筑科学 | 59篇 |
矿业工程 | 21篇 |
能源动力 | 25篇 |
轻工业 | 69篇 |
水利工程 | 10篇 |
石油天然气 | 25篇 |
武器工业 | 76篇 |
无线电 | 436篇 |
一般工业技术 | 140篇 |
冶金工业 | 448篇 |
原子能技术 | 49篇 |
自动化技术 | 235篇 |
出版年
2024年 | 7篇 |
2023年 | 40篇 |
2022年 | 114篇 |
2021年 | 149篇 |
2020年 | 47篇 |
2019年 | 47篇 |
2018年 | 36篇 |
2017年 | 43篇 |
2016年 | 76篇 |
2015年 | 77篇 |
2014年 | 82篇 |
2013年 | 103篇 |
2012年 | 95篇 |
2011年 | 152篇 |
2010年 | 99篇 |
2009年 | 97篇 |
2008年 | 106篇 |
2007年 | 119篇 |
2006年 | 118篇 |
2005年 | 82篇 |
2004年 | 81篇 |
2003年 | 64篇 |
2002年 | 63篇 |
2001年 | 47篇 |
2000年 | 25篇 |
1999年 | 30篇 |
1998年 | 25篇 |
1997年 | 20篇 |
1996年 | 18篇 |
1995年 | 15篇 |
1994年 | 7篇 |
1993年 | 9篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1984年 | 4篇 |
1977年 | 2篇 |
1968年 | 2篇 |
1966年 | 9篇 |
1965年 | 3篇 |
1964年 | 2篇 |
1960年 | 1篇 |
1957年 | 4篇 |
1956年 | 2篇 |
1955年 | 4篇 |
1954年 | 4篇 |
排序方式: 共有2174条查询结果,搜索用时 15 毫秒
101.
Schuengel C.; Sterkenburg P. S.; Jeczynski P.; Janssen C. G. C.; Jongbloed G. 《Canadian Metallurgical Quarterly》2009,77(2):291
In a controlled multiple case design study, the development of a therapeutic relationship and its role in affect regulation were studied in 6 children with visual disabilities, severe intellectual disabilities, severe challenging behavior, and prolonged social deprivation. In the 1st phase, children had sessions with an experimental therapist stimulating therapeutic attachment, alternating with a control therapist providing positive personal attention only. In the 2nd phase, both therapists applied behavior therapy. Clients sought more proximity to the experimental therapist compared with the control therapist. Psychophysiological arousal (respiratory sinus arrhythmia and pre-ejection period) was lower when the experimental therapist applied behavior modification than when the control therapist did. Despite prolonged social deprivation, the attachment behavioral system appeared responsive to stimulation. The effects on affect regulation may explain the synergy between psychotherapy based on interpersonal and behavior modification approaches. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
102.
Objective: To determine the relationship between length of time spent expressing highly aroused emotion and therapeutic outcome. Method: Thirty-eight clients (14 male, 24 female) between the ages of 22 and 60 years (M = 39.5, SD = 9.71), treated for depression with experiential therapy, were rated on working alliance and expressed emotional arousal (with the Client Expressed Emotional Arousal Scale) in their three highest arousal sessions. Among the clients, 34 were of European ethnicity, 2 were of Asian ethnicity, 1 was of Latino ethnicity, and 1 was of Caribbean–Canadian ethnicity. Clients were administered the short form of the Working Alliance Inventory following their 4th therapy session and also completed, pre- and posttherapy, the Beck Depression Inventory (BDI), the Global Severity Index (GSI) of the Symptom Checklist–90–Revised (SCL-90-R), the Inventory of Interpersonal Problems, and the Rosenberg Self-Esteem Scale. Results: Hierarchical regressions showed that a nonlinear pattern of expressed emotional arousal predicted outcome significantly above the alliance. This combination predicted 30% of outcome variance on the BDI and 24% on the GSI (p 相似文献
103.
Single-camera mobile-vision coordinate measurement is one of the primary methods of 3D-coordinate vision measurement, and coded target plays an important role in this system. A multifunctional coded target and its recognition algorithm is developed, which can realize automatic match of feature points, calculation of camera initial exterior orientation and space scale factor constraint in measurement system. The uniqueness and scalability of coding are guaranteed by the rational arrangement of code bits. The... 相似文献
104.
剖面密度分布(VDP)是影响纤维板物理力学性能的重要因素之一.本文采用单因子试验法分析了目标厚度和目标密度对纤维板VDP的影响.结果表明,目标厚度增加,表层最高密度增加、芯层最低密度降低,VDP曲线形状更加陡峭;目标密度增大,表层最高密度和芯层最低密度均增大,但对VDP曲线的形状几乎没有影响. 相似文献
105.
Reviews the book, Psychodynamic techniques: Working with emotion in the therapeutic relationship by Karen J. Maroda (see record 2010-01318-000). What makes Maroda’s work particularly remarkable, however, is that she not only manages to identify and explicate aspects of technique, but that the range of skills she addresses all converge on what can seem like an especially mystifying topic to new clinicians: the use of emotion in the therapeutic relationship. Maroda’s pragmatic tone seems to effortlessly weave concrete skills through the particularly vaporous topic of using emotion productively. The result is an admirably unmechanistic set of principles to aid clinicians in navigating the complex emotional terrain of the therapeutic relationship in a manner consistent with their own personal styles. One of the major strengths of Psychodynamic techniques is its breadth, and Maroda provides a good balance, including both general and specific issues related to the role of emotion in the therapeutic process. Despite the overall consistency of her attunement to the experience of the newer clinician, some of what Maroda stresses as vital to the therapeutic relationship may be unrealistic. The process of reading the book parallels the process of a successful therapy in which one has come to engage with and trust her guide and emerges a more flexible, confident, insightful person and professional. Maroda’s continued reassurances and frank openness to sharing her own vulnerabilities leaves the reader feeling infused with a sense of possibility that a fuller, deeper therapeutic relationship is possible. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
106.
D.V. Shtansky Ph.V. Kiryukhantsev-Korneev I.A. Bashkova A.N. Sheveiko E.A. Levashov 《International Journal of Refractory Metals and Hard Materials》2010,28(1):32
Many engineering materials working under severe cutting, stamping, or bearing conditions including humid and corrosive environments, as well as temperature fluctuation require a combination of chemical, mechanical, and tribological properties. For load-bearing metallic implants, the combination of excellent mechanical and tribological properties with biocompatibility and bioactivity is also of great importance. Desired properties can be achieved in hard films based on carbides, borides and nitrides of transition metals by alloying with metallic (Al, Cr, Zr) or nonmetallic (O, P, Si, Ca) elements. The present work demonstrates the potential of self-propagating high-temperature synthesis (SHS), magnetron sputtering (MS), and ion implantation assisted MS of SHS-composite targets to produce multicomponent nanostructured films with enhanced combination of properties. Three groups of recently developed films for mechanical engineering and medicine are considered: hard tribological Ti–(Al, Cr)–(Si, B, C, N) films with enhanced thermal stability, corrosion and oxidation resistance; nanocomposite and multilayered TiCrBN/WSex films with improved lubrication; and multifunctional bioactive nanostructured (Ti, Ta)–(Ca, Zr)–(C, N, O, Si, P) films (MuBiNaFs). 相似文献
107.
本文应用灰系统理论中的关联分析方法,初步探讨了麦谷蛋白各组分含量与面包烘烤品质指标间的关系。文中将面包烘烤品质中的面包评分,面包体积,评价值三项指标作为母因素,讨论了与其它11项指标的联系密切程度,不仅验证了剩余蛋白含量可以作为评价小麦面包烘烤品质的重要指标,同时得出了评价面包烘烤品质的其它几个指标的重要程度。 相似文献
108.
E. A. Levashov D. V. Larikhin D. V. Shtansky A. S. Rogachev H. E. Grigoryan J. J. Moore 《Journal of Materials Synthesis and Processing》2002,10(6):319-330
Two- and three-layer functionally graded PVD targets with a working layer (sputtering surface) based on TiN-TiB2 or TiN-Ti5Si3 formation via the technology of forced SHS compaction were considered. It was shown that rather wide (up to 1 mm) transition diffusional zones providing firm adhesion of the layers were formed between the working, intermediate, and third layers. The compositions TiN + TiB2 + 20%Cu and TiB2 + 50%Cu were found to be optimum for the intermediate (damping) and third layers of the three-layer PVD targets. The specific features of phase and structure formation of the two- and three-layer products with the working layer based on TiN-TiB2 and TiN-Ti5Si3 were elucidated. Variation of the chemical oven mass exerted a noticeable effect of reduction of the residual porosity and enlarging of the grains of the product phases owing to prolongation of the time for secondary structure formation. The relationship of the hardness of the layers in the functionally graded target on the chemical oven mass allow prediction of the properties of the resultant graded material systems. 相似文献
109.
Sandtray therapy is a clinical tool for helping a client express and understand his or her unconscious dynamics. It utilizes a sandtray and anywhere from a few hundred to a few thousand figurines in the room for the client to select from. These figurines cover a wide range of people, situations, and objects, from the most ordinary to the mythical. The client makes a story in the sand, which the client and therapist then discuss. It is standard therapeutic wisdom that one should not use techniques involving fantasy with psychotic clients since it is typically too hard for both them and the clinician to contain those fantasies in a healthy manner. Although this is very often true, the authors offer an example of how they were able to use sandtray to great therapeutic advantage with a schizophrenic client in the residual phase of schizophrenia. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
110.
论述了一种用于高放射性场合监控远距离操作的拉力保护装置的设计,其可有效防止辐照靶件在出堆过程中被拉断,并能保证靶件置入到其辐照工位。装置由拉杆、重量传感器、遥控器、接收器及执行电路组成。在起吊重量超过正常值时,超重程度将反应到拉杆的行程距离上。其工作原理是在出现异常情况时,如辐照孔道中靶件卡住,由于装置受力远大于正常工作时所受力,造成弹簧压缩,拉杆向下,当弹簧受力达到我们设定的保护力时,即弹簧压缩行程达到设定的行程时,拉杆上撞击头撞击行程开关,使行程开关闭合,进而断开行车吊钩上升继电器信号和发射遥控信号,使吊钩停止上升和连通报警信号,确保靶件所受力远小于其强度,保证了靶件不被破坏。 相似文献