全文获取类型
收费全文 | 2366篇 |
免费 | 87篇 |
专业分类
电工技术 | 17篇 |
化学工业 | 596篇 |
金属工艺 | 36篇 |
机械仪表 | 77篇 |
建筑科学 | 62篇 |
矿业工程 | 2篇 |
能源动力 | 50篇 |
轻工业 | 222篇 |
水利工程 | 26篇 |
石油天然气 | 4篇 |
无线电 | 189篇 |
一般工业技术 | 349篇 |
冶金工业 | 531篇 |
原子能技术 | 25篇 |
自动化技术 | 267篇 |
出版年
2023年 | 41篇 |
2022年 | 153篇 |
2021年 | 151篇 |
2020年 | 48篇 |
2019年 | 49篇 |
2018年 | 61篇 |
2017年 | 59篇 |
2016年 | 70篇 |
2015年 | 43篇 |
2014年 | 65篇 |
2013年 | 129篇 |
2012年 | 88篇 |
2011年 | 125篇 |
2010年 | 84篇 |
2009年 | 101篇 |
2008年 | 83篇 |
2007年 | 73篇 |
2006年 | 55篇 |
2005年 | 54篇 |
2004年 | 40篇 |
2003年 | 49篇 |
2002年 | 32篇 |
2001年 | 23篇 |
2000年 | 27篇 |
1999年 | 35篇 |
1998年 | 188篇 |
1997年 | 111篇 |
1996年 | 91篇 |
1995年 | 40篇 |
1994年 | 46篇 |
1993年 | 44篇 |
1992年 | 16篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 21篇 |
1988年 | 11篇 |
1987年 | 6篇 |
1986年 | 12篇 |
1985年 | 15篇 |
1984年 | 6篇 |
1983年 | 8篇 |
1982年 | 8篇 |
1981年 | 12篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1977年 | 7篇 |
1976年 | 15篇 |
1974年 | 3篇 |
1969年 | 3篇 |
1967年 | 7篇 |
排序方式: 共有2453条查询结果,搜索用时 0 毫秒
11.
C Cepollaro S Gonnelli C Pondrelli S Martini A Montagnani S Rossi L Gennari C Gennari 《Canadian Metallurgical Quarterly》1997,70(835):691-696
Measurement of ultrasonographic parameters provides information concerning not only bone density but also bone architecture. We investigated the usefulness of ultrasonographic parameters and bone mineral density for evaluating the probability of vertebral fracture. 397 postmenopausal women (59.1 +/- 6.0 years) with (n = 178) or without (n = 219) atraumatic vertebral fractures were studied. In all women, bone mineral density (BMD) of the lumbar spine was evaluated by dual X-ray absorptiometry (DXA) and speed of sound (SOS); broadband ultrasound attenuation (BUA) and Stiffness in the calcaneus were evaluated by an Achilles unit (Lunar Corporation). Ultrasonographic parameters and BMD were compared by examining the magnitude of the odds ratios, to determine which produces the highest estimate of the probability of odds of fracture, and by examining widths of the respective confidence intervals (CI) to show which estimate of odd ratio is the most precise. The relative risk of vertebral fracture, after adjusting for potential confounders, was 3.5 (CI 2.6-4.8) for BUA; 4.5 (CI 3.2-6.2) for SOS; 5.8 (CI 4.0-8.4) for Stiffness and 7.5 (CI 4.8-11.5) for BMD. Ultrasound (US) parameters were still significant independent predictors of vertebral fracture, even after adjusting for BMD. The relative risk of fracture for a simultaneous decrease by 1 SD of BMD and by 1 SD of each ultrasound parameter was 17.3 (CI 9.4-39.6) for BMD and SOS; 18.3 (CI 8.4-30.6) for BMD and BUA and 22.1 (CI 8.9-52.7) for BMD and Stiffness. Our data suggest that US and BMD provide complementary information which can be combined to improve estimates of vertebral fracture risk. 相似文献
12.
B Decchi A Zalaffi R Spidalieri U Arrigucci AM Di Troia A Rossi 《Canadian Metallurgical Quarterly》1997,105(6):484-489
We describe here the results of a screening program conducted to discover inhibitors of the type-I interleukin-1 receptor (IL-1RI) from samples of microbial origin. An innovative approach, based on automated, nonradioactive receptor binding assays has been employed. Specially prepared cell-free systems have allowed the use of high concentrations of microbial metabolites in the reaction mixtures with a low percentage of false positives. More than 30,000 microbial samples from different species of soil isolates have been tested and two interesting activities have been purified and characterized. One of these, isolated from Streptomyces sp. GE48009, was identified as niphimycin, an antifungal agent also known as scopafungin. Preliminary evidence suggests that this molecule and azalomycin F, a structural analogue, inhibit IL-IRI by virtue of their long-chain guanidinium moiety. The other activity, isolated from Aspergillus sp. GE49752, was identified as flavipin, a substituted o-phthalaldehyde. 相似文献
13.
A patient presented with a 15 year history of schizophrenia with auditory hallucinations. Though unresponsive to prolonged trials of neuroleptics, the auditory hallucinations disappeared with etizolam. 相似文献
14.
It is shown how very simple velocity-tracking robust controllers for permanent magnet motors driving nonlinear loads can be designed based on variable structure systems techniques. Very fast dynamics, accurate and robust velocity-tracking are achieved with very simple hardware components without resorting to powerful digital signal processors and related interface hardware. A cascade control structure is used to ensure maximum flexibility. The controller for a DC motor is considered in great detail. Extension to AC synchronous PM motors is also presented. At the different control levels robustness is addressed with specific algorithms and the simplest solution is always selected. The controller architecture for both DC and AC synchronous motor are presented and discussed in the paper. Experimental results related to the control of a DC motor driving a nonlinear load are also shown. They demonstrate feasibility and excellent performances of the proposed approach 相似文献
15.
M Magnani G Brandi L Rossi A Carnevali A Fraternale A Albano 《Canadian Metallurgical Quarterly》1993,84(3):539-541
In order to increase the understanding of blood cytopenias in HIV infection we have investigated the bone marrow in murine AIDS. C57BL/6 mice infected with the LP-BM5 retrovirus show a decrease in cellularity, numerous haemophagocytic histiocytes, a reduction of all erythroid precursor cells, an increase in eosinophil number and an increase in lymphocytes. Immunostaining with an anti-Pr60gag antibody shows that the majority of bone marrow cells express the viral protein. Thus, the bone marrow in MAIDS has many similarities with the bone marrow from patients with advanced AIDS and may prove useful as a model for therapy aimed at treating blood cytopenias. 相似文献
16.
Posture and gesture analysis, together with the monitoring of body kinematics, is a field of increasing interest in bioengineering and several connected disciplines. In this paper, some typical features of distributed sensing systems are described, as well as a methodology to read signals from such systems. Theory, simulation, results, and some specific applications are shown. Strain gauges have been used as sensors and have been deposited directly onto textile fibers, demonstrating one way to realize a wearable sensor system. 相似文献
17.
State-of-the-art Web applications include both navigational elements and business processes, but most Web application design methods treat business processes as just another kind of navigation. The authors' extensions to the object-oriented hypermedia design method (OOHDM) aim to remedy this situation. Rather than using navigation to emulate business processes, their new mechanisms allow developers to specify and implement processes explicitly by dealing with activity semantics and states. We describe proposed extensions to OOHDM and explore their use at an online retail store. 相似文献
18.
W. Kulisch C. Popov H. Rauscher L. Sirghi T. Sasaki S. Bliznakov F. Rossi 《Diamond and Related Materials》2008,17(7-10):1116-1121
Nucleation and growth, but especially the development of the morphology of nanocrystalline diamond/amorphous carbon (NCD/a-C) nanocomposite films have been investigated by systematic variation of three important parameters, namely the deposition time, the growth rate, and the substrate pre-treatment used to enhance the nucleation density. The films have been characterized, among others, by scanning electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy. It is shown that, by successive addition of ultradispersive diamond powder to the suspension of nanocrystalline diamond powder in n-pentane used for the ultrasonic pre-treatment, the nucleation density can be enhanced by two orders of magnitude from 1 · 108 cm− 2 to > 1 · 1010 cm− 2. This reduces the thickness required to achieve closed films from 1 µm to 100 nm. However, once coalescence of the individual nodules emerging from the nucleation sites has taken place the films loose “memory” of the nucleation step and start to develop the typical NCD morphology consisting of larger features with diameters of some hundreds of nm which are in turn composed of much smaller features. Irrespective of the feature size and of the parameters used, the films of this investigation possess AFM rms roughnesses of 9–13 nm, indicating that rms values are not sufficient to characterize NCD surfaces. 相似文献
19.
G Zaninotto M Costantini M Rossi M Anselmino S Pianalto D Oselladore D Pizzato L Norberto E Ancona 《Canadian Metallurgical Quarterly》1996,10(6):644-648
BACKGROUND: On the basis of a flowchart including prior or current jaundice or pancreatitis, abnormal liver function, ultrasound or IV cholangiography, bile duct (BD) stones were suspected in 71/593 patients referred for gallstones. METHODS: When endoscopic retrograde cholangiography detected BD stones, endoscopic sphincterotomy (ES) and endoscopic BD clearance were attempted, followed by laparoscopic cholecystectomy (LC). BD stones were found in 44/71 patients. The sensitivity values of preoperative conditions were: 92% for IV cholangiography, 88% for abnormal liver function, 50% for ultrasound, and 37% for jaundice at admission. RESULTS: Endoscopic clearance succeeded in 37 patients and LC was completed in 33 patients. Conversion to open surgery (9%) was comparable with the rate in patients without BD stones. The median hospital stay for the sequential endoscopic and laparoscopic treatments was 13 days (range 4-54) or 22 days if open surgery was used. CONCLUSIONS: In conclusion, BD stones can be endoscopically cleared preoperatively in most patients without interfering with LC. 相似文献
20.