全文获取类型
收费全文 | 1522174篇 |
免费 | 206341篇 |
国内免费 | 112132篇 |
专业分类
电工技术 | 116203篇 |
技术理论 | 73篇 |
综合类 | 154189篇 |
化学工业 | 223910篇 |
金属工艺 | 92084篇 |
机械仪表 | 95731篇 |
建筑科学 | 102337篇 |
矿业工程 | 55625篇 |
能源动力 | 62366篇 |
轻工业 | 128583篇 |
水利工程 | 41621篇 |
石油天然气 | 64053篇 |
武器工业 | 20418篇 |
无线电 | 185953篇 |
一般工业技术 | 157634篇 |
冶金工业 | 59174篇 |
原子能技术 | 18103篇 |
自动化技术 | 262590篇 |
出版年
2024年 | 3460篇 |
2023年 | 29725篇 |
2022年 | 54258篇 |
2021年 | 66241篇 |
2020年 | 67053篇 |
2019年 | 47010篇 |
2018年 | 51919篇 |
2017年 | 52258篇 |
2016年 | 54253篇 |
2015年 | 51269篇 |
2014年 | 116342篇 |
2013年 | 141609篇 |
2012年 | 214965篇 |
2011年 | 199918篇 |
2010年 | 139965篇 |
2009年 | 141258篇 |
2008年 | 78663篇 |
2007年 | 112405篇 |
2006年 | 92763篇 |
2005年 | 37674篇 |
2004年 | 16349篇 |
2003年 | 12544篇 |
2002年 | 11741篇 |
2001年 | 9392篇 |
2000年 | 9440篇 |
1999年 | 6893篇 |
1998年 | 4524篇 |
1997年 | 3032篇 |
1996年 | 2396篇 |
1995年 | 1623篇 |
1994年 | 1336篇 |
1993年 | 1405篇 |
1992年 | 1161篇 |
1991年 | 878篇 |
1990年 | 731篇 |
1989年 | 579篇 |
1988年 | 370篇 |
1987年 | 332篇 |
1986年 | 478篇 |
1985年 | 392篇 |
1984年 | 263篇 |
1983年 | 144篇 |
1982年 | 291篇 |
1981年 | 210篇 |
1980年 | 246篇 |
1979年 | 202篇 |
1978年 | 25篇 |
1976年 | 50篇 |
1959年 | 243篇 |
1951年 | 273篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
《Mechatronics》2021
In order to avoid the distortion dangers to the colon, caused by spiral-type capsule robot, a Low Torsional Torque Capsule Robot (LTTCR) is developed, capable of non-contact steering swimming motion in a tortuous pipe, filled with silicone oil. Due to the non-contact and suspension state of motion, the robot is isolated from the colon and inner pipe wall, achieving low torsional effect on the intestines. Based on the coupling principle of magnetic field, a spatial magnetic torque model is derived, while a method for detecting the critical coupling magnetic torque, in tortuous environment, is proposed. The fluid resistance torque in straight and tortuous pipes is studied, deriving the scope of stable steering. Simulation and experimental results have shown that higher commutation and slip angles are beneficial to robot steering, and the swimming speed of LTTCR is higher and the twist impact on the colon, during the steering process, is lower. The LTTCR has a promising prospect in non-invasive examination applications in the sectors of diagnosis and treatment, inside the human body. 相似文献
93.
自然通风广泛存在于城市之中,了解城市自然通风建筑室内环境质量现状及存在的问题,是改善城市建筑室内环境质量的基础. 通过文献整理,首先研究城市街道峡谷中单侧自然通风的驱动因素,其次从建筑几何特征、通风能力、污染率、颗粒物浓度以及街谷设施等方面综述单侧自然通风的相关研究,最后提出建议. 研究表明,合理的展弦比、更好的城市布局以及精心的街谷设施设计能够最大限度地利用单侧自然通风,提升城市街道峡谷的室内环境品质. 相似文献
94.
《Ceramics International》2021,47(24):34455-34462
Herein, the tungsten trioxide (WO3) nanostructure thin films with different morphologies are firstly fabricated by magnetron sputtering with glancing angle deposition technique (MS-GLAD), followed by the post annealed treatment process in air ambient for 2 h. It is demonstrated that the geometry of MS-GLAD setup, mainly substrate position, played a crucial role in determining the morphology, crystallinity, optical transmittance, and photo-electrochemical (PEC) performance of the WO3 nanostructured thin film. With the different substrate positions in the MS-GLAD system, the WO3 nanorod film layer could be precisely changed to combine an underlying dense layer with a nanorod layer and then nanocolumnar film. Moreover, the prepared samples' chemical composition and work function are studied by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS), respectively. The combining WO3 nanostructure produced high PEC efficiency compared to the single layer of the WO3 nanorods sample and the dense WO3 thin film sample. Thus, morphology-controlled nanostructure film based on the MS-GLAD technique in our study provides a simple approach to enhance the photo-anode for PEC water splitting application. 相似文献
95.
Yuan-Cheng Meng Hua-Feng Zhang Xiao-Xiao Pan Nan Chen Hui-Fang Hu Saeed ul Haq Abid Khan Ru-Gang Chen 《International journal of molecular sciences》2021,22(6)
Dehydrins (DHNs) play an important role in abiotic stress tolerance in a large number of plants, but very little is known about the function of DHNs in pepper plants. Here, we isolated a Y1SK2-type DHN gene “CaDHN3” from pepper. To authenticate the function of CaDHN3 in salt and drought stresses, it was overexpressed in Arabidopsis and silenced in pepper through virus-induced gene silencing (VIGS). Sub-cellular localization showed that CaDHN3 was located in the nucleus and cell membrane. It was found that CaDHN3-overexpressed (OE) in Arabidopsis plants showed salt and drought tolerance phenotypic characteristics, i.e., increased the initial rooting length and germination rate, enhanced chlorophyll content, lowered the relative electrolyte leakage (REL) and malondialdehyde (MDA) content than the wild-type (WT) plants. Moreover, a substantial increase in the activities of antioxidant enzymes; including the superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and lower hydrogen peroxide (H2O2) contents and higher O2•− contents in the transgenic Arabidopsis plants. Silencing of CaDHN3 in pepper decreased the salt- and drought-stress tolerance, through a higher REL and MDA content, and there was more accumulation of reactive oxygen species (ROS) in the CaDHN3-silenced pepper plants than the control plants. Based on the yeast two-hybrid (Y2H) screening and Bimolecular Fluorescence Complementation (BiFC) results, we found that CaDHN3 interacts with CaHIRD11 protein in the plasma membrane. Correspondingly, the expressions of four osmotic-related genes were significantly up-regulated in the CaDHN3-overexpressed lines. In brief, our results manifested that CaDHN3 may play an important role in regulating the relative osmotic stress responses in plants through the ROS signaling pathway. The results of this study will provide a basis for further analyses of the function of DHN genes in pepper. 相似文献
96.
In this study, a kind of Ni-based superalloy specially designed for additive manufacturing (AM) was investigated. Thermo-Calc simulation and differential scanning calorimetry (DSC) analysis were used to determine phases and their transformation temperature. Experimental specimens were prepared by laser metal deposition (LMD) and traditional casting method. Microstructure, phase constitution and mechanical properties of the alloy were characterized by scanning electron microscopy (SEM), transmission scanning electron microscopy (TEM), X-ray diffraction (XRD) and tensile tests. The results show that this alloy contains two basic phases, γ/γ', in addition to these phases, at least two secondary phases may be present, such as MC carbides and Laves phases. Furthermore, the as-deposited alloy has finer dendrite, its mean primary dendrite arm space (PDAS) is about 30-45 μm, and the average size of γ' particles is 100-150 nm. However, the dendrite size of the as-cast alloy is much larger and its PDAS is 300-500 μm with secondary and even third dendrite arms. Correspondingly, the alloy displays different tensile behavior with different processing methods, and the as-deposited specimen shows better ultimate tensile stress (1,085.7±51.7 MPa), yield stress (697±19.5 MPa) and elongation (25.8%±2.2%) than that of the as-cast specimen. The differences in mechanical properties of the alloy are due to the different morphology and size of dendrites, γ', and Laves phase, and the segregation of elements, etc. Such important information would be helpful for alloy application as well as new alloy development. 相似文献
97.
为推进病历数字化发展,并确保其信息的安全性,将以HIS电子病历系统为基础,采用安信数字签名技术和PKI或PMI系统搭建相信并加以任用的授权服务,经过针对实际的PKC和CA的确认、委托与管控构建整体的数字签名平台,完成电子病历数字签名功能设计,以加强电子文件的完整性、真实性和不可抵赖性。最后以某医院的XML结构化的电子病历系统为基础进行项目实施,完成了医护人员通过HIS的快速身份认证,和准确地数字签名。 相似文献
98.
99.
100.
气藏平均地层压力跟踪计算新方法 总被引:1,自引:0,他引:1
平均地层压力是产能评价和动态分析的基础,准确、快速获取平均地层压力对高效开发气藏意义重大。基于地层压力随时间变化的规律,分析了平均地层压力的变化规律。研究结果表明:平均地层压力等效点仅随时间发生改变,平均地层压力的下降速率等于或者近似等于井底流压的下降速率。从封闭弹性驱动气藏的物质平衡方程出发,考虑偏差系数和井底流压随平均地层压力的变化,推导建立了平均地层压力跟踪计算新方法,根据生产数据可迭代计算平均地层压力。方法验证结果显示,采气速度和采出程度共同影响模型的计算结果。应用实例表明,跟踪计算法与压力恢复试井和物质平衡法之间的相对误差均较小,满足工程计算精度要求,且跟踪计算法不需依托生产测试数据,节约了测试费用,避免了测试占产。 相似文献