全文获取类型
收费全文 | 427012篇 |
免费 | 6837篇 |
国内免费 | 1399篇 |
专业分类
电工技术 | 7855篇 |
综合类 | 365篇 |
化学工业 | 65063篇 |
金属工艺 | 14540篇 |
机械仪表 | 12157篇 |
建筑科学 | 12546篇 |
矿业工程 | 914篇 |
能源动力 | 11542篇 |
轻工业 | 45067篇 |
水利工程 | 3417篇 |
石油天然气 | 1883篇 |
武器工业 | 14篇 |
无线电 | 56586篇 |
一般工业技术 | 79030篇 |
冶金工业 | 77409篇 |
原子能技术 | 5704篇 |
自动化技术 | 41156篇 |
出版年
2021年 | 3068篇 |
2020年 | 2095篇 |
2019年 | 2759篇 |
2018年 | 4180篇 |
2017年 | 4236篇 |
2016年 | 4582篇 |
2015年 | 3787篇 |
2014年 | 6161篇 |
2013年 | 20175篇 |
2012年 | 10904篇 |
2011年 | 15613篇 |
2010年 | 11927篇 |
2009年 | 13560篇 |
2008年 | 14610篇 |
2007年 | 14889篇 |
2006年 | 13360篇 |
2005年 | 12446篇 |
2004年 | 11948篇 |
2003年 | 11604篇 |
2002年 | 11247篇 |
2001年 | 11356篇 |
2000年 | 10513篇 |
1999年 | 11032篇 |
1998年 | 24575篇 |
1997年 | 17979篇 |
1996年 | 14209篇 |
1995年 | 11198篇 |
1994年 | 9987篇 |
1993年 | 9575篇 |
1992年 | 7259篇 |
1991年 | 6904篇 |
1990年 | 6497篇 |
1989年 | 6206篇 |
1988年 | 5952篇 |
1987年 | 4974篇 |
1986年 | 4917篇 |
1985年 | 6065篇 |
1984年 | 5697篇 |
1983年 | 4920篇 |
1982年 | 4569篇 |
1981年 | 4527篇 |
1980年 | 4274篇 |
1979年 | 4157篇 |
1978年 | 3842篇 |
1977年 | 4641篇 |
1976年 | 6212篇 |
1975年 | 3174篇 |
1974年 | 3068篇 |
1973年 | 2938篇 |
1972年 | 2352篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
The changes of nitric oxide synthase (NOS) activity and nitrite level in rat brain regions after spatial learning were investigated. NOS activity was assayed by conversion of [3H]L-arginine to [3H]L-citrulline, and a sensitive fluorometric assay for quantification of nitrite was used. Compared with sham-trained rats, NOS activity and nitrite level in hippocampus and cortex, and also the nitrite level in cerebellum, was elevated significantly one day after rats had learnt a water-rewarded spatial alteration task. These results suggest a spatial memory-related changes of endogenous NO in rat brain, and support the idea that NO participates in learning and memory processes. 相似文献
992.
K Hayashida J Ooi K Omagari K Makiyama S Kohno 《Canadian Metallurgical Quarterly》1997,94(11):730-738
One of the shortcomings of percutaneous ethanol injection therapy (PEIT) for hepatocellular carcinoma (HCC) is that many sessions are necessary to accomplish the treatment. This may be caused by which the ultrasonography (US) image does not reflect correctly to the kinetics of injected ethanol into HCC nodule. It is considered that number of treatment sessions are able to be reduced if we just enough injected labelled ethanol under US into HCC nodule. Therefore, we tried PEIT by ethanol mixed with CO2 microbubble (CO2 ethanol). The injected CO2 ethanol was aquired as hyperechoic image without strong acoustic shadow to the end of injection. Consequently we could reduce the number of treatment sessions to almost 1 for lesions < or = 3 cm in diameter and markedly reduce total dose of injected ethanol. The detectable rate of CO2 ethanol leaked out HCC nodule was high. No serious complication occurred. There have been only 1 lesion of local recurrence and no case of intrahepatic and peritoneal dissemination for 11.5 months on average of observation after PEIT by CO2 ethanol (CO2PEIT). These findings suggest that CO2PEIT is useful method for reducing the number of treatment sessions and total dose of injected ethanol, moreover preventing complication by ethanol leakage. 相似文献
993.
S Higashiyama M Horikawa K Yamada N Ichino N Nakano T Nakagawa J Miyagawa N Matsushita T Nagatsu N Taniguchi H Ishiguro 《Canadian Metallurgical Quarterly》1997,122(3):675-680
The availability of an analgesic compound devoid of the side effects associated with the commonly used opioid and nonsteroidal antiinflammatory drugs would be useful during the perioperative period. Although adenosine has analgesic and anesthetic-sparing properties, it also produces dose-dependent cardiovascular depression. Inhibitors of adenosine kinase may be able to provide analgesia without producing acute cardiovascular or respiratory depression. This preliminary study investigated the effects of a novel adenosine kinase-inhibiting drug, GP683, on the minimum alveolar anesthetic concentration (MAC) of desflurane in dogs. Seven mongrel dogs were administered one of three different GP683 dose regimens (or the solvent) by intravenous infusion on separate occasions according to a cross-over study design. After determining the baseline desflurane MAC value, GP683 was infused at 75, 150, or 300 microg x kg(-1) x min(-1) for 5 min as a loading dose, followed by 15, 30, or 60 microg x kg(-1) x min(-1) for an additional 85 min to maintain a stable plasma drug level. The desflurane MAC was redetermined 30-90 min after starting the study drug or vehicle infusion, and 30-90 min and 120-180 min after termination of the infusion. Cardiovascular variables and plasma concentrations of GP683 were determined at specific intervals before, during, and after the MAC determinations. The three GP683 dose regimens produced 22%, 31%, and 50% decreases in the desflurane MAC, respectively. In addition, there was good correlation between the decrease in desflurane MAC and the plasma GP683 concentration (r = -0.78). Although the mean arterial pressure (MAP) was decreased up to 25% by the highest infusion rate of GP683, adjustments in the desflurane concentration to an equi-MAC value resulted in normalization of the MAP values. Furthermore, GP683 produced no changes in heart rate. In conclusion, the adenosine kinase-inhibiting drug, GP683, produced dose-dependent decreases in the desflurane MAC of dogs without producing untoward hemodynamic changes. IMPLICATIONS: An investigational drug (GP683) that can increase the levels of an important endogenous substance in the body (adenosine) has been found to decrease the anesthetic requirement in dogs without producing adverse effects on the cardiovascular system. 相似文献
994.
995.
Electromagnetic fields in homogeneous source-free regions can be decomposed into fields that are TE and TM with respect to a particular reference direction (e.g., the z direction). If transverse sources exist, both TE and TM fields may be excited simultaneously. This paper considers the case of two infinite regions having a common planar interface and prescribed sources (surface currents) on the interface. The source currents are decomposed in a manner consistent with the decomposition of the fields. Accordingly, a procedure is established for describing the boundary conditions at the interface in terms of the longitudinal field components Ez, Hz and the surface currents J¯s. The development is unique in that the continuity of the transverse field components at the boundary are not explicitly considered but interpreted in terms of z-directed fields. This boundary condition approach is shown to give results consistent with those obtained by matching the tangential fields at the interface using vector transforms. A simple example illustrating the procedure using a ring of current in free-space is presented 相似文献
996.
The free fraction of pertechnetate in 99Tcm radiopharmaceuticals has to be tested for quality control reasons in line with the European Pharmacopoeia. Such quality control is often performed by miniaturized chromatographic methods. There are several recommended methods in the literature for quality control of the same radiopharmaceuticals, though it is unlikely that all methods are equivalent. Some of these methods were compared, taking into account different parameters (spot size, time required, analytical artifacts, true separation and shape of the chromatographic peaks, ease of handling), to verify the best method for the control of each radiopharmaceutical. It would appear that instant thin layer chromatography silica gel is the best support for these miniaturized methods, using MEK as solvent to check DTPA, DMSA, gluconate, pyrophosphate, medronate and phytate; NaCl 20% solution is the best solvent for IDA derivatives, human albumin and albumin particles (microspheres, macroaggregates). 相似文献
997.
FJ Couch ML DeShano MA Blackwood K Calzone J Stopfer L Campeau A Ganguly T Rebbeck BL Weber 《Canadian Metallurgical Quarterly》1997,336(20):1409-1415
BACKGROUND: To define the incidence of BRCA1 mutations among patients seen in clinics that evaluate the risk of breast cancer, we analyzed DNA samples from women seen in this setting and constructed probability tables to provide estimates of the likelihood of finding a BRCA1 mutation in individual families. METHODS: Clinical information, family histories, and blood for DNA analysis were obtained from 263 women with breast cancer. Conformation-sensitive gel electrophoresis and DNA sequencing were used to identify BRCA1 mutations. RESULTS: BRCA1 mutations were identified in 16 percent of women with a family history of breast cancer. Only 7 percent of women from families with a history of breast cancer but not ovarian cancer had BRCA1 mutations. The rates were higher among women from families with a history of both breast and ovarian cancer. Among family members, an average age of less than 55 years at the diagnosis of breast cancer, the presence of ovarian cancer, the presence of breast and ovarian cancer in the same woman, and Ashkenazi Jewish ancestry were all associated with an increased risk of detecting a BRCA1 mutation. No association was found between the presence of bilateral breast cancer or the number of breast cancers in a family and the detection of a BRCA1 mutation, or between the position of the mutation in the BRCA1 gene and the presence of ovarian cancer in a family. CONCLUSIONS: Among women with breast cancer and a family history of the disease, the percentage with BRCA1 coding-region mutations is less than the 45 percent predicted by genetic-linkage analysis. These results suggest that even in a referral clinic specializing in screening women from high-risk families, the majority of tests for BRCA1 mutations will be negative and therefore uninformative. 相似文献
998.
Application of the extremum stack to neurological MRI 总被引:2,自引:0,他引:2
Simmons A. Arridge S.R. Tofts P.S. Barker G.J. 《IEEE transactions on medical imaging》1998,17(3):371-382
999.
Kang W.P. Wisitsora-at A. Davidson J.L. Kerns D.V. 《Electron Device Letters, IEEE》1998,19(10):379-381
A boron-doped diamond field emitter diode with ultralow turn-on voltage and high emission current is reported. The diamond field emitter diode structure with a built-in cap was fabricated using molds and electrostatic bonding techniques. The emission current versus anode voltage of the capped diamond emitter diode with boron doping, sp2 content, and vacuum thermal electric (VTE) treatment shows a very low turn-on voltage of 2 V. A high emission current of 1 μA at an anode voltage of less than 10 V can be obtained from a single diamond tip. The turn-on voltage is significantly lower than comparable silicon field emitters 相似文献
1000.
An analytic theory is presented which demonstrates that the noise induced Gordon-Haus timing jitter in arbitrary dispersion-managed transmission systems is reduced by the power-enhancement factor required to support a dispersion-managed solitons provided the path-average soliton period is much greater than the dispersion-map period. The analysis further predicts the behaviour of the amplitude, width, and quadratic chirp fluctuations due to the amplified spontaneous emission (ASE) noise 相似文献