全文获取类型
收费全文 | 2695篇 |
免费 | 129篇 |
国内免费 | 141篇 |
专业分类
电工技术 | 107篇 |
技术理论 | 2篇 |
综合类 | 116篇 |
化学工业 | 570篇 |
金属工艺 | 50篇 |
机械仪表 | 178篇 |
建筑科学 | 390篇 |
矿业工程 | 42篇 |
能源动力 | 98篇 |
轻工业 | 63篇 |
水利工程 | 71篇 |
石油天然气 | 91篇 |
武器工业 | 18篇 |
无线电 | 87篇 |
一般工业技术 | 288篇 |
冶金工业 | 64篇 |
原子能技术 | 192篇 |
自动化技术 | 538篇 |
出版年
2024年 | 10篇 |
2023年 | 18篇 |
2022年 | 53篇 |
2021年 | 69篇 |
2020年 | 78篇 |
2019年 | 55篇 |
2018年 | 70篇 |
2017年 | 71篇 |
2016年 | 105篇 |
2015年 | 94篇 |
2014年 | 155篇 |
2013年 | 243篇 |
2012年 | 155篇 |
2011年 | 201篇 |
2010年 | 129篇 |
2009年 | 132篇 |
2008年 | 154篇 |
2007年 | 167篇 |
2006年 | 180篇 |
2005年 | 144篇 |
2004年 | 130篇 |
2003年 | 104篇 |
2002年 | 89篇 |
2001年 | 61篇 |
2000年 | 56篇 |
1999年 | 36篇 |
1998年 | 32篇 |
1997年 | 29篇 |
1996年 | 23篇 |
1995年 | 25篇 |
1994年 | 19篇 |
1993年 | 7篇 |
1992年 | 10篇 |
1991年 | 8篇 |
1990年 | 11篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1959年 | 4篇 |
排序方式: 共有2965条查询结果,搜索用时 15 毫秒
11.
A new discretization method for aggregation equations is developed. It is compared to the fixed pivot technique proposed by Kumar and Ramkrishna (1996a. On the solution of population balance equations by discretization—I. A fixed pivot technique. Chemical Engineering Science 51, 1311-1332). The numerical results for aggregation problems by discretized population balances are consistently overpredicting and diverge before the gelling point in the case of a gelling kernel. The present work establishes a new technique which assigns the particles within the cells more precisely. This is achieved by taking first the average of the newborn particles within the cell and then assigning them to the neighboring nodes such that pre-chosen properties are exactly preserved. The new technique preserves all the advantages of the conventional discretized methods and provides a significant improvement in predicting the particle size distribution (PSD). In addition, it is found that the technique is a powerful tool for the computation of gelling problems. The effectiveness of the technique is illustrated by application to several aggregation problems for suitably selected aggregation kernels including physically relevant kernels. 相似文献
12.
Xia Haihong Zhao Zhixiang Li Jigen Shi Yongqian Han Yinlu Zhu Shengyun Xu Yongli Guan Xialing Cui Baoqun Fu Shinian 《Frontiers of Energy and Power Engineering in China》2007,1(2):135-140
The conceptual study on the accelerator driven system (ADS) that lasted for about five years ended in 1999 in China. As one
project of the National Basic Research Program of China (973 Program) in the energy domain, which is sponsored by the China
Ministry of Science and Technology (MOST), a five-year-program of fundamental research of ADS physics and related technology
was launched in 2000 and passed national review at the end of 2005. The China Institute of Atomic Energy (CIAE), the Institute
of High Energy Physics (IHEP), the Institute of Heavy Ion Physics in Peking University (PKU-IHIP) and other institutions jointly
carried out the research. The research activities were focused on HPPA physics and technology, reactor physics of external
source driven sub-critical assembly, nuclear data base and material study. For HPPA, a high current injector consisting of
an ECR ion source, LEBT and an RFQ accelerating structure of 3.5 MeV was built. In reactor physics study, a series of neutron
multiplication experimental study has been carried out and still being done. The VENUS facility has been constructed as the
basic experimental platform for neutronics study in ADS blanket. It’s a zero power sub-critical neutron multiplying assembly
driven by external neutron produced by a pulsed neutron generator. The theoretical, experimental and simulation study on nuclear
data, material properties and nuclear fuel circulation related to ADS is carrying on to provide the database for ADS system
analysis. The main results on ADS related researches will be reported. 相似文献
13.
冯小强 《电脑与微电子技术》2012,(20):64-66
从系统管理员的角度出发,对全国计算机等级考试上机考试进行探讨和分析。提出一套上机考试系统环境的配置方法,对考试中出现的常见问题进行分析、提供对策。 相似文献
14.
为减缓大坝阻隔对鱼类洄游的不利影响,水电工程需要建设有效的过鱼设施疏通其洄游通道。高寒区高坝大库工程过鱼设施建设是一个极其复杂的技术问题,目前国内类似工程尚无成功运用经验。实际过鱼设施内流场条件十分复杂,会产生不利于鱼类上溯的水流形态。基于此原因,对某水电站工程坝下尾水流场进行了数值模拟。研究表明,在机组运行时,电站尾水渠左右两侧发电尾水主流的边缘是明显具有流速梯度分布的区域,符合鱼类聚集的水流特征,具备布置鱼道进口条件。这样可根据尾水位的变化开启两侧不同进口诱鱼,且在机组停运时,可开启左侧进口诱鱼。 相似文献
15.
Energy Aspects in Drying 总被引:1,自引:0,他引:1
T. Kudra 《Drying Technology》2004,22(5):917-932
The energy performance of a dryer and a drying process is characterized by various indices such as volumetric evaporation rate, steam consumption, unit heat consumption and energy (thermal) efficiency. Of all indices, energy efficiency is the most frequently quoted, in technical specifications. A thorough analysis of available information, including the Handbook of Industrial Drying, points to the inconsistency of terminology, definition and data interpretation. Thus, reported data on energy efficiency vary significantly and frequently contradict both drying theory and industrial practice. To establish a common platform to deal with energy issues, this article provides a concise overview of the most common definitions of energy efficiency, along with a critical review of the published data. A need for energy audit and benchmarking is pointed out. To eliminate shortcomings of the energy efficiency as a lumped parameter, and to allow analysis of energy consumption over time (batch drying) or distance (continuous drying), instantaneous and cumulative indices are proposed. Using these indices, the energy performance of selected dryers is examined, and possible modifications to dryer design and operating parameters are indicated in order to reduce the overall energy consumption. 相似文献
16.
突扩突跌掺气设施后泄槽底板脉动压力试验研究 总被引:1,自引:0,他引:1
有压洞出口后的突扩突跌掺气减蚀设施在水利工程中经常使用。由于水流受边界条件和掺气的影响,其流态和脉动压力往往与普通水槽的情况有很大的不同。通过水工模型试验,对突扩突跌掺气设施后泄槽底板上的脉动压力进行研究,揭示了掺气设施后泄槽底板上不同流动区域的脉动压力特性。从脉动压力的时域过程、均方根值、偏态系数、峰态系数和主频率等多方面得出冲击区、反射区和稳定区脉动压力的特性是不相同的结论。同一流量时,沿流程底板的时均压力都大于脉动压力的均方根值,在冲击区、反射区和稳定区,脉动压力的均方根值分别是同位置时均压力值的约0.5倍、0.6倍和0.7倍。研究成果可为更好地利用突扩突跌掺气设施提供有益的理论和试验依据。 相似文献
17.
A deterministic model for multipurpose, multiperiod batch plants was presented in a linearized form to predict the future
design according to the change of demand by using a modified Benders’ Decomposition. The OSL code offered by the IBM corporation
as optimizer was employed for solving several example problems. The decomposition method was successful, showing remarkable
reduction in the computing times as compared with those of the direct solution method. Also the heuristic used as a solution
approach for the multiperiod model provided an efficient methodology to the block-structured problem by dividing the large
overall problem into the manageable single period blocks. 相似文献
18.
The crystallization kinetics of pentaerythritol (PeE) in aqueous solution in the presence of impurity or not in a batch cooling crystallizer was explored. Also, the solubility and the nucleation and crystal growth kinetics of PeE in aqueous solution were investigated. A second-order dependence of PeE growth rate on supersaturation is observed in pure PeE-water system. The crystal growth rate of PeE-water system in the presence of impurity is proportional to the supersaturation to the 3.5 power. The nucleation and crystal growth behaviors for PeE-water system in a batch cooling crystallizer were grasped according to Mersmann's criteria. The nucleation in this crystallizer was found to act with heterogeneous nucleation. In this system, it suggests that the crystal growth is controlled by a complex mechanism behavior of surface integrated and diffusion limited. Simplified relation was derived for calculation of mean crystal size of product crystals from the batch cooling crystallizer. The obtained relation was verified by a set of experiments. 相似文献
19.
《Journal of Process Control》2014,24(5):613-620
This paper presents a state space model predictive fault-tolerant control scheme for batch processes with unknown disturbances and partial actuator faults. To develop the model predictive fault-tolerant control, the batch process is first treated into a non-minimal representation using state space transformation. The relevant concepts of the corresponding model predictive fault-tolerant control is thus introduced through state space formulation, where improved closed-loop control performance is achieved even with unknown disturbances and actuator faults, because, unlike traditional model predictive fault-tolerant control, the proposed control method can directly regulate the process output/input changes in the design. For performance comparison, a traditional model predictive fault-tolerant control is also designed. Application to injection velocity control shows that the proposed scheme achieve the design objective well with performance improvement. 相似文献
20.