全文获取类型
收费全文 | 1482篇 |
免费 | 69篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 22篇 |
化学工业 | 331篇 |
金属工艺 | 29篇 |
机械仪表 | 43篇 |
建筑科学 | 20篇 |
矿业工程 | 5篇 |
能源动力 | 112篇 |
轻工业 | 137篇 |
水利工程 | 44篇 |
石油天然气 | 1篇 |
无线电 | 155篇 |
一般工业技术 | 248篇 |
冶金工业 | 75篇 |
原子能技术 | 9篇 |
自动化技术 | 322篇 |
出版年
2024年 | 4篇 |
2023年 | 35篇 |
2022年 | 53篇 |
2021年 | 57篇 |
2020年 | 38篇 |
2019年 | 57篇 |
2018年 | 74篇 |
2017年 | 52篇 |
2016年 | 62篇 |
2015年 | 47篇 |
2014年 | 64篇 |
2013年 | 120篇 |
2012年 | 62篇 |
2011年 | 100篇 |
2010年 | 68篇 |
2009年 | 84篇 |
2008年 | 60篇 |
2007年 | 67篇 |
2006年 | 48篇 |
2005年 | 40篇 |
2004年 | 28篇 |
2003年 | 35篇 |
2002年 | 26篇 |
2001年 | 16篇 |
2000年 | 17篇 |
1999年 | 14篇 |
1998年 | 19篇 |
1997年 | 26篇 |
1996年 | 15篇 |
1995年 | 19篇 |
1994年 | 11篇 |
1993年 | 7篇 |
1992年 | 16篇 |
1991年 | 12篇 |
1990年 | 12篇 |
1989年 | 11篇 |
1988年 | 13篇 |
1987年 | 6篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1972年 | 3篇 |
1969年 | 1篇 |
排序方式: 共有1553条查询结果,搜索用时 31 毫秒
61.
Shambhu Prasad Suraj Nayak Vamshi Vijay Rajib Mall 《Innovations in Systems and Software Engineering》2016,12(4):263-278
Simulink and Stateflow (SL/SF) models are being widely used to design and develop embedded systems. Often the SL/SF models of embedded controllers turn out to be large and consist of many subsystems and hierarchies. When such a system is maintained, it becomes difficult to manually analyse the model to identify the impacted elements due to the existence of several explicit and implicit dependencies among the model elements. To automate the analysis of an SL/SF model, we propose a metamodel to capture various types of dependencies existing across the basic blocks. We have named this metamodel Simulink dependency graph (SLDG). We investigate the use of SLDG in change impact visualization and regression test selection. We have developed a prototype tool by implementing our approach for the aforementioned applications. 相似文献
62.
The interaction between molten gallium and the hydrocarbon medium induced by ultrasonic energy—can gallium carbide be formed? 下载免费PDF全文
Vijay Bhooshan Kumar Manuel Monte Olivier Mathon Sakura Pascarelli Ze'ev Porat Aharon Gedanken 《Journal of the American Ceramic Society》2017,100(7):3305-3315
Ultrasonic irradiation of molten gallium in organic liquids (decane, dodecane, etc.) results in dispersion of the gallium into nanometric spheres. These were examined by several analytical methods XRD, DSC, Raman and IR spectroscopy) as well as electron microscopy (SEM, TEM) and found to be composed of Ga and C. The DSC analysis indicates that the Ga has possibly reacted with carbon, while the Raman spectrum of the product demonstrates a strong additional peak that could not be identified. This work explores the possibility that the product is gallium carbide or another gallium‐carbon complex. To investigate the nature of the product, we performed detailed extended X‐ray absorption fine structure (EXAFS) and X‐ray absorption near‐edge structure (XANES) analyses. On the basis of DSC, IR, and Raman it appear to be formation of GaC, whereas the analysis by EXAFS and XANES demonstrated that the gallium is found to be in a higher reduced state (almost metallic), supported by carbon. The question that remains open in addition to the one related to the formation of galium carbide is whether a complex structure, including oxygen contamination is involved in the layers surrounding the Ga as indicated by the EXAFS results. 相似文献
63.
Microsystem Technologies - In the current paper, a new temperature sensor with improved temperature inaccuracy and with very low power consumption has been designed for avionic industry. The... 相似文献
64.
Vijay Juneja Sudarsan Mukhopadhyay Harry Marks Tim B. Mohr Alex Warning Ashim Datta 《Food and Bioprocess Technology》2014,7(2):437-446
The effects and interactions of heating temperature (60 °C to 73.9 °C), salt (0.0 % to 4.5 %?w/v), sodium pyrophosphate (0.0 % to 0.5 %?w/v), and sodium lactate (0.0 % to 4.5 %?w/v) on the heat resistance of a five-strain mixture of Listeria monocytogenes in 75 % lean ground beef were examined. Meat samples in sterile filtered stomacher bags were heated in a temperature controlled waterbath to determine thermal death times. The recovery medium was tryptic soy agar supplemented with 0.6 % yeast extract and 1 % sodium pyruvate. Weibull survival functions were employed to model the primary survival curves. Then, survival curve-specific estimated parameter values obtained from the Weibull model were used for determining a secondary model. The results indicate that temperature and salt have a large impact on the inactivation kinetics of L. monocytogenes, while sodium lactate (NaL) has an impact in the presence of salt. The model presented in this paper for predicting inactivation of L. monocytogenes can be used as an aid in designing lethality treatments meant to control the presence of this pathogen in ready-to-eat products. 相似文献
65.
Despite of substantial advancement, the effect of grain boundary (GB) complexions on high temperature creep deformation process has not been fully understood. In this paper, we have studied the high temperature bending creep deformation of copper bicrystal with various GB complexions under different loads using molecular dynamics simulation. It has been found that specimen with normal kite GB complexion have better creep resistance properties when subjected to comparatively lower applied load. In case of monolayer Zr segregation, a drastic decrease in creep strength as well as creep plasticity is observed due to inhibition of GB migration. On the other hand, deviation between creep properties for specimen with split-kite GB complexion and split-kite bilayer Zr segregation GB complexion is minimal. Enhanced creep plasticity is observed in case of split-kite bilayer Zr segregation GB complexion, which is due to formation of interpenetrating icosahedral clusters in the necking region. Fracture in specimen with monolayer Zr segregation GB complexion has occurred by means of slip phenomenon at lower deformation load whereas amorphization and necking is observed at higher deformation load. In case of specimen with bilayer Zr segregation GB complexion, it is found that fracture has occurred through amorphization and necking at all deformation loads due to higher GB thickness. 相似文献
66.
Akhlesh Lakhtakia Vijay K. Varadan Vasundara V. Varadan 《Journal of Modern Optics》2013,60(4):649-657
Abstract A general uniaxial medium is characterized by its permittivity and permeability tensors having the same preferred axis. The plane wave reflection and transmission characteristics of a planar interface between free space and a general uniaxial medium have been obtained; since application as a polarizer is envisioned, the preferred axis lies in a plane parallel to the interface. Application of the Brewster law, as well as conditions for total reflection are explored. 相似文献
67.
68.
The hazard of ionizing radiation exposure due to nuclear accidents or terrorist attacks is ever increasing. Despite decades of research, still, there is a shortage of non-toxic, safe and effective medical countermeasures for radiological and nuclear emergency. To date, the U.S. Food and Drug Administration (U.S. FDA) has approved only two growth factors, Neupogen (granulocyte colony-stimulating factor (G-CSF), filgrastim) and Neulasta (PEGylated G-CSF, pegfilgrastim) for the treatment of hematopoietic acute radiation syndrome (H-ARS) following the Animal Efficacy Rule. Promising radioprotective efficacy results of γ-tocotrienol (GT3; a member of the vitamin E family) in the mouse model encouraged its further evaluation in the nonhuman primate (NHP) model. These studies demonstrated that GT3 significantly aided the recovery of radiation-induced neutropenia and thrombocytopenia compared to the vehicle controls; these results particularly significant after exposure to 5.8 or 6.5 Gray (Gy) whole body γ-irradiation. The stimulatory effect of GT3 on neutrophils and thrombocytes (platelets) was directly and positively correlated with dose; a 75 mg/kg dose was more effective compared to 37.5 mg/kg. GT3 was also effective against 6.5 Gy whole body γ-irradiation for improving neutrophils and thrombocytes. Moreover, a single administration of GT3 without any supportive care was equivalent, in terms of improving hematopoietic recovery, to multiple doses of Neupogen and two doses of Neulasta with full supportive care (including blood products) in the NHP model. GT3 may serve as an ultimate radioprotector for use in humans, particularly for military personnel and first responders. In brief, GT3 is a promising radiation countermeasure that ought to be further developed for U.S. FDA approval for the ARS indication. 相似文献
69.
Multimedia Tools and Applications - The development of the medical services framework is advanced by the development of the Internet of Things (IoT) innovation. There are many hindrances in the... 相似文献
70.
Huddar Mahesh G. Sannakki Sanjeev S. Rajpurohit Vijay S. 《Multimedia Tools and Applications》2021,80(9):13059-13076
Multimedia Tools and Applications - Due to the availability of an enormous amount of multimodal content on the social web and its applications, automatic sentiment analysis, and emotion detection... 相似文献