全文获取类型
收费全文 | 94169篇 |
免费 | 8574篇 |
国内免费 | 5170篇 |
学科分类
工业技术 | 107913篇 |
出版年
2024年 | 137篇 |
2023年 | 1124篇 |
2022年 | 1861篇 |
2021年 | 2923篇 |
2020年 | 2393篇 |
2019年 | 2092篇 |
2018年 | 2276篇 |
2017年 | 2555篇 |
2016年 | 2493篇 |
2015年 | 3454篇 |
2014年 | 4615篇 |
2013年 | 5535篇 |
2012年 | 6562篇 |
2011年 | 7109篇 |
2010年 | 6332篇 |
2009年 | 6221篇 |
2008年 | 6244篇 |
2007年 | 6025篇 |
2006年 | 5892篇 |
2005年 | 4932篇 |
2004年 | 3887篇 |
2003年 | 3513篇 |
2002年 | 4113篇 |
2001年 | 3477篇 |
2000年 | 2516篇 |
1999年 | 1998篇 |
1998年 | 1398篇 |
1997年 | 1152篇 |
1996年 | 1061篇 |
1995年 | 929篇 |
1994年 | 748篇 |
1993年 | 524篇 |
1992年 | 411篇 |
1991年 | 312篇 |
1990年 | 260篇 |
1989年 | 175篇 |
1988年 | 150篇 |
1987年 | 109篇 |
1986年 | 57篇 |
1985年 | 57篇 |
1984年 | 53篇 |
1983年 | 41篇 |
1982年 | 34篇 |
1981年 | 27篇 |
1980年 | 27篇 |
1979年 | 16篇 |
1978年 | 13篇 |
1977年 | 15篇 |
1976年 | 19篇 |
1959年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 19 毫秒
91.
Jialong Tian M. Babar Shahzad Wei Wang Lichang Yin Zhouhua Jiang Ke Yang 《材料科学技术学报》2018,34(9):1671-1675
The effect of Co addition on the formation of Ni-Ti clusters in maraging stainless steel was studied by three dimensional atom probe (3DAP) and first-principles calculation. The cluster analysis based on the maximum separation approach showed an increase in size but a decrease in density of Ni-Ti clusters with increasing the Co content. The first-principles calculation indicated weaker Co-Ni (Co-Ti) interactions than Co-Ti (Fe-Ti) interactions, which should be the essential reason for the change of distribution characteristics of Ni-Ti clusters in bcc Fe caused by Co addition. 相似文献
92.
目的建立固相萃取-气相色谱-串联质谱法测定紫菜中扑草净的残留量。方法样品用乙腈提取,经活性炭/氨基复合柱(Envi-Carb/NH_2)净化,经Rxi-5MS石英毛细管色谱柱分离,采用电子轰击源质谱检测,选择离子监测(selective ion monitoring,SIM)模式检测,外标法定量。结果扑草净在2~1000μg/L范围内具有良好的线性关系,相关系数r~2=0.9998。扑草净在5、10、20、50μg/kg 4种条件下,样品加标回收率在95.1%~107.9%,RSD在5.36%~7.77%(n=6),方法检出限为1μg/kg,定量限为4μg/kg。结论该方法操作简单,准确度与精密度较好,能快速简便地检测紫菜中扑草净的残留量。 相似文献
93.
Flood, as a serious worldwide environment problem, can lead to detrimental economic losses and fatalities. Effective flood control is desired to mitigate the adverse impacts of flooding and the associated flood risk through development of cost-effective and efficient flood management decisions and policies. A bi-level fuzzy two-stage stochastic programming model, named BIFS model is developed in this study to provide decision support for economic analysis of flood management. The BIFS model is capable of not only addressing the sequential decision making issue involving the two-level decision makers, but also correcting the pre-regulated flood management decisions before the occurrence of a flood event in the two-stage environment. The probabilistic and non-probabilistic uncertainties expressed as probability density functions and fuzzy sets are quantitatively analyzed. The overall satisfaction solution is obtained for meeting the goals of the two-level decision makers by compromising, reflecting the tradeoffs among various decision makers in the two decision-making levels. The results of application of the BIFS model to a representative case study indicate informed decision strategies for flood management. Tradeoffs between economic objectives and uncertainty-averse attitudes of decision makers are quantified. 相似文献
94.
Weining Xie Yaqun He Hong Li Yu Zhang Xiangnan Zhu 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2018,40(4):446-452
Raw coal was ground in a Hardgrove mill, and mineral liberation from coal was investigated by float-sink test and electron probe microanalyzer (EPMA). Based on EPMA, associated conditions of mineral were determined. Analyses of energy-size reduction show that energy efficiency decreases with time. For +0.074 mm progenies, yields of particles in ?1.5 g.cm?3 decrease with the increase of size and time, and products in +1.8 g.cm?3 show the opposite trend. EPMA of 0.25–0.125 mm, 1.5–1.8 g.cm?3 products ground for 10 min indicates that only part of minerals are liberated. For ?0.074 mm products, the yield of particles in ?1.5 g.cm?3 decreases by 23.36% in last several minutes, but ash content of +1.8 g.cm?3 also decreases by 13.18%. Since breakage of raw coal in last 9 min does not reduce particle size obviously, and liberation degree cannot be improved dramatically, closed grinding of 10 min in Hardgrove mill is proper to balance the size reduction and mineral liberation. 相似文献
95.
An up to date review of continuously variable speed wind turbines with mechatronic variable transmissions 下载免费PDF全文
Xiuxing Yin 《国际能源研究杂志》2018,42(4):1442-1454
As a promising and potential alternative to conventional fixed or variable speed wind turbines, continuously variable speed wind turbines (CVSWTs) with variable transmissions offer improved power efficiency and enhanced power control capabilities. The CVSWTs can be generally achieved by adapting mechatronic variable transmissions in the turbine drive train for continuously variable speed operations for wind turbines. Therefore, this paper serves to provide an up to date and exhaustive review of the CVSWTs with mechatronic variable transmissions such as mechanical variable transmission, electrical variable transmission, and power splitting transmission. In this paper, the analysis of CVSWTs with different mechatronic transmission topologies is performed regarding basic configurations, dynamic characteristics, control principles, and experimental or simulation results. Review results indicate the feasibility of applying CVSWTs with such mechatronic transmissions and highlight superiorities of the CVSWTs with power splitting transmission. The CVSWT with power splitting transmission will be particularly suitable for megawatt‐scale turbine systems and will hence increase the economic competitiveness of these turbines due to its large power capacity and high reliability. The directions or challenges for future investigations of CVSWTs with such mechatronic transmissions are also presented to foster in‐depth understanding of such CVSWTs and their control strategies. 相似文献
96.
Risk allocation decisions are of critical importance in project management. The present study proposes an explanation for how risk allocation in a contract motivates a contractor to cooperate with a project owner. Theories of risk allocation and trust were used to motivate the research. Using a survey methodology, we collected data concerning 124 construction projects in China. We found that risk allocation influenced the contractor’s role behavior through the contractor’s feeling of being trusted but not the contractor’s trust in the owner. Feeling of being trusted partially mediated the effect of risk allocation on the contractor’s in-role (i.e., contractual) behavior and fully mediated the effect on extra-role behavior. The study introduces a social and psychological view of the impacts of risk allocation to the project and engineering management literature. We contribute to theory by arguing and demonstrating the mediating effect of trust on the relationship between risk allocation and contractor behavior. From a practical standpoint, we conclude that contractual risk allocation has a significant impact on building a trusting relationship between owners and contractors and that contractors who feel trusted perform both contractually mandated actions and actions external to the contract more diligently, resulting in the likelihood of improved outcomes for both parties. 相似文献
97.
Functionalized graphene oxide-modified poly(ε-caprolactone) composites ((graphene oxide)GO/PCL) were successfully synthesized by Steglich esterification for drug applications of controlled release. Lomefloxacin (LMF) was selected as a model drug to investigate its controlled release properties. The controlled release effect of the LMF-contained pills of the GO/PCL and polylactic acid blend was evaluated. In contrast to the pure PCL, GO/PCL could effectively adjust the time of drug release and release the drug at a constant rate, achieving the controlled release requirements. Furthermore, different additive amounts of graphene oxide have different effects on adjusting the time of controlled release, while the best result obtained under the ratio is 4% GO/PCL as carrier of drug. Thus, high-quality drug carrier materials are obtained which are more suitable for clinical use. Exploring the optimum addition of graphene oxide is very significant for the development of GO/PCL carrier material. 相似文献
98.
目前国内外地层压力测井解释方法较多,但大多数方法基于欠压实沉积理论并局限于单一的地层岩性,尤其是针对盆地边缘山前深层构造,单一测井参数确定地层压力误差较大,且无法解释沉积压实机制以外的异常高压。为此,将多种异常高压机制相关的测井参数进行综合解释,建立适合山前复杂构造的地层压力测井多参数计算模型,评价准噶尔盆地南缘高泉背斜高探1井的地层压力剖面,其计算结果与钻井实测数据吻合,相对误差小于3.00%.同时,基于原始沉积加载—卸载过程力学原理,利用地层压力测井多参数分析判别出高泉背斜深层各层系异常高压的形成机制。 相似文献
99.
100.
ABSTRACT A very small amount of aryl amide derivative (TMB-5) was used for nucleating Poly(ethylene 2,6-naphathalate) (PEN) by melt blending. The crystalline temperature, crystallinity, and nucleation efficiency of the composites were increased as a result of the addition of TMB-5. The half-time of crystallization decreased upon the addition of TMB-5 and the work required in folding polymer chains were reduced simultaneously in the polymer mixtures. The crystal size of the PEN/TMB-5 blends became smaller due to the increase of nucleation sites. The TMB-5 had no effect on the PEN crystal type. TMB-5 slightly increased the impact strength of PEN. 相似文献