全文获取类型
收费全文 | 644篇 |
免费 | 12篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 7篇 |
化学工业 | 92篇 |
金属工艺 | 19篇 |
机械仪表 | 18篇 |
建筑科学 | 31篇 |
能源动力 | 9篇 |
轻工业 | 33篇 |
水利工程 | 1篇 |
石油天然气 | 3篇 |
无线电 | 44篇 |
一般工业技术 | 140篇 |
冶金工业 | 179篇 |
原子能技术 | 8篇 |
自动化技术 | 74篇 |
出版年
2021年 | 5篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 8篇 |
2016年 | 7篇 |
2015年 | 4篇 |
2014年 | 10篇 |
2013年 | 30篇 |
2012年 | 15篇 |
2011年 | 19篇 |
2010年 | 11篇 |
2009年 | 12篇 |
2008年 | 25篇 |
2007年 | 15篇 |
2006年 | 14篇 |
2005年 | 19篇 |
2004年 | 16篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 20篇 |
2000年 | 20篇 |
1999年 | 12篇 |
1998年 | 53篇 |
1997年 | 48篇 |
1996年 | 24篇 |
1995年 | 15篇 |
1994年 | 12篇 |
1993年 | 10篇 |
1992年 | 9篇 |
1991年 | 12篇 |
1990年 | 13篇 |
1989年 | 10篇 |
1988年 | 8篇 |
1987年 | 8篇 |
1986年 | 11篇 |
1985年 | 4篇 |
1984年 | 10篇 |
1983年 | 9篇 |
1982年 | 12篇 |
1981年 | 3篇 |
1980年 | 14篇 |
1979年 | 7篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 14篇 |
1975年 | 7篇 |
1974年 | 6篇 |
1973年 | 7篇 |
1971年 | 3篇 |
1970年 | 4篇 |
排序方式: 共有658条查询结果,搜索用时 31 毫秒
571.
Brian Cotterell Gordon Williams John Hutchinson Michael Thouless 《International Journal of Fracture》2003,119(3):55-59
There is some controversiy over the analysis of the peel test when there is significant plastic deformation. To resolve this controversy a round robin on its analysis is announced contributions to which are invited. Details are given of test cases to be analysed. 相似文献
572.
NA Heerema HN Sather MG Sensel P Kraft JB Nachman PG Steinherz BJ Lange RS Hutchinson GH Reaman ME Trigg DC Arthur PS Gaynon FM Uckun 《Canadian Metallurgical Quarterly》1998,16(4):1270-1278
PURPOSE: Nonrandom chromosomal translocations are frequently observed in pediatric patients with acute lymphoblastic leukemia (ALL). Specific translocations, such as t(4;11) and t(9;22), identify subgroups of B-lineage ALL patients who have an increased risk of treatment failure. The current study was conducted to determine the prognostic significance of chromosomal translocations in T-lineage ALL patients. MATERIALS AND METHODS: The study included 169 children with newly diagnosed T-lineage ALL enrolled between 1988 and 1995 on risk-adjusted protocols of the Children's Cancer Group (CCG) who had centrally reviewed cytogenetics data. Outcome analyses used standard life-table methods. RESULTS: Presenting features for the current cohort were similar to those of concurrently enrolled patients for whom cytogenetic data were not accepted on central review. The majority of patients (80.5%) were assigned to CCG protocols for high-risk ALL and 86.4% had pseudodiploid (n = 80) or normal diploid (n = 66) karyotypes; modal chromosome number was not a significant prognostic factor. Overall, 103 of 169 (61%) patients had an abnormal karyotype, including 31 with del(6q), 29 with 14q11 breakpoints, 15 with del(9p), 11 with trisomy 8, nine with 11q23 breakpoints, nine with 14q32 translocations, and eight with 7q32-q36 breakpoints. Thirteen patients had the specific 14q11 translocation t(11;14)(p13;q11) and all were classified as poor risk. Patients with any of these translocations had outcomes similar to those with normal diploid karyotypes. CONCLUSION: Chromosomal abnormalities, including specific nonrandom translocations, were frequently observed in a large group of children with T-lineage ALL, but were not significant prognostic factors for this cohort. Thus, contemporary intensive treatment programs result in favorable outcomes for the majority of T-lineage ALL patients, regardless of karyotypic abnormalities, and such features do not identify patients at higher risk for relapse. 相似文献
573.
MJ Breslin SJ deSolms EA Giuliani GE Stokker SL Graham DL Pompliano SD Mosser KA Hamilton JH Hutchinson 《Canadian Metallurgical Quarterly》1998,8(23):3311-3316
The structure-activity relationship of a series of non-thiol CaaX analogs, which are inhibitors of farnesyltransferase, is described. These inhibitors contain a substituted phenyl group at the N terminus, which may occupy a novel binding domain on the Ras protein. 相似文献
574.
575.
576.
The production of patterns and designs upon surfaces has received only limited attention, with texturing techniques being accepted as adequate. Texturing, however, can be a very unsatisfactory and clumsy method of producing complex and accurate designs upon a surface, even more so with surfaces such as NURBS where a texture may appear very much distorted when mapped to a surface. This paper introduces a new approach called surface graph sketching which draws upon ideas from planar graph sketching for the construction of complex curve networks across parametrically defined surfaces. Surface curves can be created by a number of methods and stored in the parameter space of the surface thereby allowing intricate and more importantly accurate surface designs to be created. Regions of the surface may be assigned a property such as colour or texture, or cut away to produce holes. Surface graph sketching has a number of applications, in the design of trimming curves, surface patterning and texture map definitions. 相似文献
577.
K Hutchinson F Hafeez TD Woods PS Chopra TF Warner RL Levine TJ Kamp 《Canadian Metallurgical Quarterly》1998,11(7):755-757
Fine strands associated with prosthetic heart valves have been demonstrated with transesophageal echocardiography, but the pathologic identity of these strands is unclear. A case of a man with a prosthetic aortic Medtronic-Hall valve with prominent valve strands and recurrent strokes is discussed. The patient underwent valve replacement surgery, and histopathologic examination of the strands identified them as Lambl's excrescences. 相似文献
578.
579.
TP Hutchinson 《Canadian Metallurgical Quarterly》1997,168(5):1382-1383
580.
Scott Hutchinson Edward Hensel Steven Castillo Kim Dalton 《International journal for numerical methods in engineering》1991,32(2):347-362
A study is conducted of the finite element solution of elliptic partial differential equations on a data parallel computer. A nodal assembly technique is introduced which maps a single node to a single processor. The system of equations is first assembled and then solved in parallel using a conjugate gradient algorithm for unsymmetric, non-positive definite systems. Using this technique and a massively parallel machine, problems in excess of 100k nodes are solved. Results of electromagnetic scattering, governed by the 2-d scalar Helmholtz equation, are presented for both an infinite cylinder and an airfoil cross-section. Solutions are demonstrated for a wide range of object sizes. A summary of performance data is given for a set of test problems. 相似文献