全文获取类型
收费全文 | 3217篇 |
免费 | 86篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 58篇 |
综合类 | 6篇 |
化学工业 | 607篇 |
金属工艺 | 52篇 |
机械仪表 | 44篇 |
建筑科学 | 105篇 |
矿业工程 | 2篇 |
能源动力 | 57篇 |
轻工业 | 217篇 |
水利工程 | 26篇 |
石油天然气 | 11篇 |
武器工业 | 1篇 |
无线电 | 361篇 |
一般工业技术 | 595篇 |
冶金工业 | 789篇 |
原子能技术 | 48篇 |
自动化技术 | 325篇 |
出版年
2023年 | 25篇 |
2022年 | 41篇 |
2021年 | 52篇 |
2020年 | 39篇 |
2019年 | 34篇 |
2018年 | 34篇 |
2017年 | 41篇 |
2016年 | 49篇 |
2015年 | 41篇 |
2014年 | 53篇 |
2013年 | 112篇 |
2012年 | 107篇 |
2011年 | 112篇 |
2010年 | 83篇 |
2009年 | 89篇 |
2008年 | 139篇 |
2007年 | 101篇 |
2006年 | 99篇 |
2005年 | 85篇 |
2004年 | 77篇 |
2003年 | 72篇 |
2002年 | 90篇 |
2001年 | 61篇 |
2000年 | 59篇 |
1999年 | 77篇 |
1998年 | 217篇 |
1997年 | 156篇 |
1996年 | 129篇 |
1995年 | 75篇 |
1994年 | 83篇 |
1993年 | 62篇 |
1992年 | 42篇 |
1991年 | 41篇 |
1990年 | 40篇 |
1989年 | 33篇 |
1988年 | 56篇 |
1987年 | 36篇 |
1986年 | 24篇 |
1985年 | 38篇 |
1984年 | 33篇 |
1983年 | 28篇 |
1982年 | 33篇 |
1981年 | 30篇 |
1980年 | 25篇 |
1979年 | 20篇 |
1978年 | 32篇 |
1977年 | 38篇 |
1976年 | 56篇 |
1975年 | 25篇 |
1972年 | 20篇 |
排序方式: 共有3304条查询结果,搜索用时 31 毫秒
31.
A spatially resolved infrared (IR) imaging technique to monitor the linear adsorbed CO coverage on supported catalyst surface combining an IR bandpass filter and an IR thermography camera has been developed. Images acquired during the CO adsorption/desorption and ignition indicate that the technique provides an excellent method to image the change of surface coverage with a spatial resolution. It is expected that the combination of infrared thermography with spatially resolved imaging of surface coverage will provide a deeper insight in the dynamics of spatio-temporal patterns on heterogeneous catalysts. 相似文献
32.
Over the last decade there have emerged many electronic applications of HTS technology which have important military as well as commercial implications. Examples of these include space communications, terrestrial wireless communications, radar, surveillance, countermeasures, medical applications and cryo-electronics. I will review many of the efforts in in this area that have been supported by the DoD which has invested over $350M on this technology. In addition I will discuss the efforts to develop cryocoolers to support the HTS technology. 相似文献
33.
In order to test the hypothesis that binding sites of cholera toxin for its receptor, the monosialoganglioside GM1, are shared between adjacent beta-polypeptide chains, two inactive chemical derivatives of the B subunit of cholera toxin (CTB) were prepared and were subsequently used for the construction of hybrid CTB pentamers. One inactive derivative consisted of CTB specifically modified in the single essential Trp-88 residue of each beta-chain. This residue was modified by formylation, a treatment preserving the structural integrity of CTB. The other inactive derivative consisted of CTB specifically succinylated in three amino groups located in or near the receptor binding site. Using [1,4-14C]succinic anhydride for the site-specific succinylation and analysis of radiolabeled tryptic fragments of S-carboxymethylated [14C]sssCTB revealed that the amino groups specifically modified were the alpha-amino group of Thr-1 and the epsilon-amino groups of respectively Lys-34 and Lys-91. Upon submitting equal amounts of formylated CTB and site-specific succinylated CTB to a denaturation-renaturation cycle, hybrid pentamers were formed which in contrast to the parental compounds were able to bind GM1. The affinity of hybrid CTB for GM1, as estimated by a competitive solid-phase radiobinding assay was unexpectedly high and only 2.5-fold lower than that of its native counterpart. The number of active binding sites on hybrid CTB was determined from: (i) titration with the oligosaccharide moiety of GM1 (oligo-GM1) and monitoring the reversal of the Trp fluorescence quenching by iodide ions and (ii) rapid gel filtration over a superdex HR column of a mixture of hybrid CTB and an excess of 3H-labeled oligo-GM1. The data are in agreement with the formation of one active binding per four reconstituted binding sites in hybrid CTB, which is consistent with a random association of CTB monomers during the denaturation-renaturation cycle. 相似文献
34.
James Rodgers Kaye Wolf Norm Willis Don Hamilton Ralph Ledbetter Curtis Stewart 《Color research and application》1994,19(5):322-331
A multiplant Quality Improvement Team [QIT] was firmed to develop and implement an evaluation program for various color measurement .systems as potential replacements for the then-current aging systems. The emphasis qf this article is the analytical methodology utilized to evaluate the various color systems. The evaluation program consisted cf two phases. Phase I was a general overview/review of several systems, while Phase II was an extensive internal comparative evaluation measurement systems. These were Milton-Roy's ColorMate HDS, HunterLab's Ultrascan, Datacolor's CS-5, and BYK-Gardner's The Color Sphere [TCS]. The main comparison criteria were interinstrument agreement [agreement between two instruments ofthe same system], user-friendly software and computer interface capability, vendor amenability to a long-term logistical and maintenance relationship, and price. All systems were evaluated by duplicate measurements on various color tiles, yarns, and polymer flakes-over 1600 measurements on each system. The systems were compared with an instrument matrix, a decision matrix, and a product matrix. The instrument matrix was a comparison qfinstrument parameters, software/math treatments, and economics. The decision matrix was a forced ranking of each system by each criteria category [1–4 scale, with 1 representing the best and 4 representing the worst]. The product matrix accentuated the relative importance ofone criterion category over another by multiplying the forced ranking by the criticality of the category. The criticality of a given category wus determined by consensus within the QIT. Thr combination qf the three matrices allowed the evaluator[.s] t o select the color rneasuremmt system that best satixfied the color measurement needs and requirements of their facility and their products. For this evaluation, all ofthe evaluated systems were superior to the then-current agingsystems. As a result of this methodology, one instrument emerged as clearly superior. © 1994 John Wrley & Sons, Inc. 相似文献
35.
JM Lablanche EP McFadden N Meneveau JR Lusson B Bertrand JP Metzger V Legrand G Grollier C Macaya B de Bruyne A Vahanian A Grentzinger C Masquet JE Wolf G Tobelem S Fontecave A Vacheron P d'Azemar ME Bertrand 《Canadian Metallurgical Quarterly》1997,96(10):3396-3402
BACKGROUND: Experimental studies suggest that the antiproliferative effect of heparin after arterial injury is maximized by pretreatment. No previous studies of restenosis have used a pretreatment strategy. We designed this study to determine whether treatment with nadroparin, a low-molecular-weight heparin, started 3 days before the procedure and continued for 3 months, affected angiographic restenosis or clinical outcome after coronary angioplasty. METHODS AND RESULTS: In a prospective multicenter, double-blind, randomized trial, elective coronary angioplasty was performed on 354 patients who were treated with daily subcutaneous nadroparin (0.6 mL of 10,250 anti-Xa IU/mL) or placebo injections started 3 days before angioplasty and continued for 3 months. Angiography was performed just before and immediately after angioplasty and at follow-up. The primary study end point was angiographic restenosis, assessed by quantitative coronary angiography 3 months after balloon angioplasty. Clinical follow-up was continued up to 6 months. Clinical and procedural variables and the occurrence of periprocedural complications did not differ between groups. At angiographic follow-up, the mean minimal lumen diameter and the mean residual stenosis in the nadroparin group (1.37+/-0.66 mm, 51.9+/-21.0%) did not differ from the corresponding values in the control group (1.48+/-0.59 mm, 48.8+/-18.9%). Combined major cardiac-related clinical events (death, myocardial infarction, target lesion revascularization) did not differ between groups (30.3% versus 29.6%). CONCLUSIONS: Pretreatment with the low-molecular-weight heparin nadroparin continued for 3 months after balloon angioplasty had no beneficial effect on angiographic restenosis or on adverse clinical outcomes. 相似文献
36.
STUDY DESIGN: The study of two patients whose rib deformity was treated using a new endoscopic thoracoplasty technique is reported. OBJECTIVES: To report a new endoscopic thoracoplasty technique for the treatment of rib deformities associated with idiopathic scoliosis. SUMMARY OF BACKGROUND DATA: Thoracoplasty has traditionally been performed as an open procedure, often necessitating additional incisions and/or tissue dissection. METHODS: Two children with significant rib humps associated with idiopathic scoliosis were treated with a new endoscopic thoracoplasty technique. RESULTS: Both children showed dramatic cosmetic improvement of their rib deformity. CONCLUSIONS: The indications for the use of video-assisted thoracoscopic surgery in the treatment of pediatric spinal deformity are expanding. We have extended our video-assisted thoracoscopic surgery repertoire to include endoscopic thoracoplasty for treatment of rib deformities associated with idiopathic scoliosis. The technique for endoscopic thoracoplasty is discussed, and illustrative cases are presented. 相似文献
37.
M. Bravin O. Buu A.C. Forbes S.A.J. Wiegers L. Puech P.E. Wolf 《Journal of Low Temperature Physics》1998,110(1-2):375-380
We present T
1
measurements performed in liquid and solid
3
He confined in sintered silver. In the liquid case, we find a close to linear relationship between T
1
and the applied magnetic field, similar to other (non metallic) systems, and up to higher frequencies (corresponding to 11 T) than previously reported. In the solid, the relaxation rate is found to increase spectacularly at large polarizations, which may indicate a polarization dependence of the exchange motion.
Now atNow at 相似文献
38.
A fully automated isocratic high-performance liquid chromatographic method for the determination of 9-cis-retinoic acid, 13-cis-retinoic acid, all-trans-retinoic acid, 4-oxo-13-cis-retinoic acid and 4-oxo-all-trans-retinoic acid, has been developed using on-line solid-phase extraction and a column switching technique allowing clean-up and pre-concentration in a single step. A 500-microliter sample of serum was diluted with 750 microliters of a solution containing 20% acetonitrile and the internal standard 9,10-dimethylanthracene. About 1000 microliters of this mixture was injected on a 20 x 4.6 mm I.D. poly ether ether ketone (PEEK) pre-column with titanium frits packed with Bondapak C18, 37-53 microns, 300 A particles. Proteins and very polar compounds were washed out to waste, from the pre-column, with 0.05% trifluoroacetic acid (TFA)-acetonitrile (8.5:1.5, v/v). More than 200 aliquots of diluted serum could be injected on this pre-column before elevated back-pressure enforces replacement. Components retained on the pre-column were backflushed to the analytical column for separation and detection at 360 nm. Baseline separation was achieved using a single 250 x 4.6 mm I.D. Suplex pKb-100 column and a mobile phase containing 69:10:2:16:3 (v/v) of acetonitrile-methanol-n-butanol-2% ammonium acetate-glacial acetic acid. A total time of analysis of less than 30 min, including sample preparation, was achieved. Recoveries were in the range of 79-86%. The limit of detection was 1-7 ng/ml serum and the precision, in the concentration range 20-1000 ng/ml, was between 1.3 and 4.5% for all five compounds. The method was applied for the analysis of human serum after oral administration of 60 mg Roaccutan. The method is well suited for pharmacological studies, while the endogenous levels of some retinoic acid isomers are below the limit of quantitation. 相似文献
39.
A flow reaction system was developed to study the steady state kinetics of hydrogen evolution in the presence of Ru(bipy)2+, MV+2, EDTA and a heterogeneous supported catalyst. Under the conditions used, steady state rates similar to those previously reported with colloidal Pt particles were attained. Furthermore, over much of the range of concentrations used, the reaction was zero order and it did not exhibit an Arrhenius behavior. Examination of the various rate determining steps involved led us to conclude that surface processes such as the recombination and desorption of hydrogen from the Pt surface might be rate determining. 相似文献
40.