全文获取类型
收费全文 | 134612篇 |
免费 | 18343篇 |
国内免费 | 13947篇 |
专业分类
电工技术 | 11748篇 |
技术理论 | 9篇 |
综合类 | 17971篇 |
化学工业 | 11297篇 |
金属工艺 | 4317篇 |
机械仪表 | 9681篇 |
建筑科学 | 13207篇 |
矿业工程 | 4517篇 |
能源动力 | 6091篇 |
轻工业 | 4381篇 |
水利工程 | 8578篇 |
石油天然气 | 7222篇 |
武器工业 | 1993篇 |
无线电 | 11018篇 |
一般工业技术 | 11836篇 |
冶金工业 | 4692篇 |
原子能技术 | 1311篇 |
自动化技术 | 37033篇 |
出版年
2024年 | 752篇 |
2023年 | 2127篇 |
2022年 | 4116篇 |
2021年 | 4715篇 |
2020年 | 5066篇 |
2019年 | 4376篇 |
2018年 | 4199篇 |
2017年 | 5175篇 |
2016年 | 5968篇 |
2015年 | 6226篇 |
2014年 | 8315篇 |
2013年 | 8840篇 |
2012年 | 9852篇 |
2011年 | 10648篇 |
2010年 | 8458篇 |
2009年 | 8701篇 |
2008年 | 8725篇 |
2007年 | 9810篇 |
2006年 | 8485篇 |
2005年 | 7419篇 |
2004年 | 5981篇 |
2003年 | 5244篇 |
2002年 | 4151篇 |
2001年 | 3427篇 |
2000年 | 2980篇 |
1999年 | 2286篇 |
1998年 | 1914篇 |
1997年 | 1577篇 |
1996年 | 1483篇 |
1995年 | 1286篇 |
1994年 | 1054篇 |
1993年 | 747篇 |
1992年 | 619篇 |
1991年 | 485篇 |
1990年 | 386篇 |
1989年 | 326篇 |
1988年 | 202篇 |
1987年 | 132篇 |
1986年 | 101篇 |
1985年 | 98篇 |
1984年 | 103篇 |
1983年 | 47篇 |
1982年 | 66篇 |
1981年 | 35篇 |
1980年 | 49篇 |
1979年 | 47篇 |
1978年 | 16篇 |
1974年 | 10篇 |
1959年 | 17篇 |
1951年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
151.
L. V. El’nikova 《Journal of Superconductivity and Novel Magnetism》2007,20(2):197-199
We describe the lyotropic liquid crystalline phase transitions in the lipid mixture dipalmitoil-PC/dilauroy-PC/cholesterol
by 3D spin-1 lattice model. The formation of nanoscale domains with the characteristic size about 300 nm was studied in experiments
on confocal fluorescence microscopy (CFM) (G. V. Feigenson and J. T. Buboltz, Biophys. J.
80, 2775 (2001)). The structure parameters of the lamellar vesicle in dipalmitoil-PC-rich phase, corresponding to these regions,
are verified by numerical Monte Carlo simulations on the lattice. We point its superconductivity analogy properties at the
region of phase stability for composition-dependent nanoscopic region. 相似文献
152.
Assessing the role of basic control measures, antivirals and vaccine in curtailing pandemic influenza: scenarios for the US, UK and the Netherlands 总被引:1,自引:0,他引:1 下载免费PDF全文
An increasing number of avian flu cases in humans, arising primarily from direct contact with poultry, in several regions of the world have prompted the urgency to develop pandemic preparedness plans worldwide. Leading recommendations in these plans include basic public health control measures for minimizing transmission in hospitals and communities, the use of antiviral drugs and vaccination. This paper presents a mathematical model for the evaluation of the pandemic flu preparedness plans of the United States (US), the United Kingdom (UK) and the Netherlands. The model is used to assess single and combined interventions. Using data from the US, we show that hospital and community transmission control measures alone can be highly effective in reducing the impact of a potential flu pandemic. We further show that while the use of antivirals alone could lead to very significant reductions in the burden of a pandemic, the combination of transmission control measures, antivirals and vaccine gives the most 'optimal' result. However, implementing such an optimal strategy at the onset of a pandemic may not be realistic. Thus, it is important to consider other plausible alternatives. An optimal preparedness plan is largely dependent on the availability of resources; hence, it is country-specific. We show that countries with limited antiviral stockpiles should emphasize their use therapeutically (rather than prophylactically). However, countries with large antiviral stockpiles can achieve greater reductions in disease burden by implementing them both prophylactically and therapeutically. This study promotes alternative strategies that may be feasible and attainable for the US, UK and the Netherlands. It emphasizes the role of hospital and community transmission control measures in addition to the timely administration of antiviral treatment in reducing the burden of a flu pandemic. The latter is consistent with the preparedness plans of the UK and the Netherlands. Our results indicate that for low efficacy and coverage levels of antivirals and vaccine, the use of a vaccine leads to the greatest reduction in morbidity and mortality compared with the singular use of antivirals. However, as these efficacy and coverage levels are increased, the use of antivirals is more effective. 相似文献
153.
A motivational model of rural students' intentions to persist in, versus drop out of, high school. 总被引:1,自引:0,他引:1
Using self-determination theory, the authors tested a motivational model to explain the conditions under which rural students formulate their intentions to persist in, versus drop out of, high school. The model argues that motivational variables underlie students' intentions to drop out and that students' motivation can be either supported in the classroom by autonomy-supportive teachers or frustrated by controlling teachers. LISREL analyses of questionnaire data from 483 rural high school students showed that the provision of autonomy support within classrooms predicted students' self-determined motivation and perceived competence. These motivational resources, in turn, predicted students' intentions to persist, versus drop out, and they did so even after controlling for the effect of achievement. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
154.
F-X域粘弹性波动方程保幅偏移 总被引:6,自引:1,他引:5
提出了一种利用粘弹性声波波动方程进行偏移的新方法。其基本思路是,修改成像条件,使修改后的成像方程中考虑振幅补偿,然后利用粘弹性、单程波动方程在F-X域对震源和接收点波场进行延拓,进而完成散射、透射等补偿。理论数据处理和实际地震资料处理表明,该方法理论基础可靠,处理效果明显,能较好地解决实际地质问题。 相似文献
155.
Binoy Ravindran Peng Li Tamir Hegazy 《Journal of Parallel and Distributed Computing》2003,63(12):1219-1242
We present two proactive resource allocation algorithms, RBA*-FT and OBA-FT, for fault-tolerant asynchronous real-time distributed systems. The algorithms consider an application model where task timeliness is specified by Jensen's benefit functions and the anticipated application workload during future time intervals is described by adaptation functions. In addition, we assume that reliability functions of processors are available a priori. Given these models, our objective is to maximize aggregate task benefit and minimize aggregate missed deadline ratio in the presence of processor failures. Since determining the optimal solution is computationally intractable, the algorithms heuristically compute sub-optimal resource allocations, but in polynomial time. Experimental results reveal that RBA*-FT and OBA-FT outperform their non-fault-tolerant counterparts in the presence of processor failures. Furthermore, RBA*-FT performs better than OBA-FT, although OBA-FT incurs better worst-case and amortized computational costs. Finally, we observe that both algorithms robustly withstand errors in the estimation of anticipated failures. 相似文献
156.
Abstract. Certification is one criterion that employers seek when hiring network professionals. Many employers assume a certified network professional is better able to manage networked resources than is a non-certified counterpart. Therefore, employers often offer a monetary premium to attract certified network professionals. By measuring end-user perceptions, the current study empirically assesses the popular industry assumption that certified network professionals are more adept managers of network resources than those individuals who are not certified network professionals. Analyses of a data derived from 299 end-users of 11 separate local area networks indicate no statistically significant difference exists between the capabilities of certified network professionals and non-certified network professionals. 相似文献
157.
影响轧辊表面粗糙度的因素很多,为此对影响辊面粗糙度的因素进行了系统分析和实验研究,得出了轧辊和砂轮的速度、砂轮粒度、砂轮直径及磨削液等主要因素对轧辊表面粗糙度影响的一般规律。利用回归分析的方法建立了轧辊表面粗糙度的数学模型,并将计算值与实测值进行了比较,发现两者基本一致。此项研究为适时控制冷轧带钢在线磨辊辊面粗糙度提供了计算模型。 相似文献
158.
转炉合金最小成本控制模型 总被引:8,自引:1,他引:7
介绍了基于合金最小成本的转炉炼钢钢水成分调整模型工应用于宝钢炼钢在线生产控制的情况。模型给出了在满足目标成分等工艺要求下,成本最小的合金投入组合及合金投入量;计算了合金加入钢包后引起钢水温度、重量等的变化,为降低生产成本(合金投入),提高出钢成分控制精度提供了有效的途径。 相似文献
159.
160.