全文获取类型
收费全文 | 5190篇 |
免费 | 355篇 |
国内免费 | 31篇 |
专业分类
电工技术 | 85篇 |
综合类 | 29篇 |
化学工业 | 1118篇 |
金属工艺 | 141篇 |
机械仪表 | 151篇 |
建筑科学 | 147篇 |
矿业工程 | 3篇 |
能源动力 | 340篇 |
轻工业 | 504篇 |
水利工程 | 60篇 |
石油天然气 | 99篇 |
无线电 | 636篇 |
一般工业技术 | 1060篇 |
冶金工业 | 249篇 |
原子能技术 | 47篇 |
自动化技术 | 907篇 |
出版年
2024年 | 16篇 |
2023年 | 169篇 |
2022年 | 313篇 |
2021年 | 428篇 |
2020年 | 289篇 |
2019年 | 283篇 |
2018年 | 364篇 |
2017年 | 288篇 |
2016年 | 275篇 |
2015年 | 180篇 |
2014年 | 237篇 |
2013年 | 431篇 |
2012年 | 274篇 |
2011年 | 304篇 |
2010年 | 207篇 |
2009年 | 195篇 |
2008年 | 141篇 |
2007年 | 103篇 |
2006年 | 107篇 |
2005年 | 85篇 |
2004年 | 82篇 |
2003年 | 53篇 |
2002年 | 60篇 |
2001年 | 48篇 |
2000年 | 33篇 |
1999年 | 46篇 |
1998年 | 77篇 |
1997年 | 52篇 |
1996年 | 45篇 |
1995年 | 31篇 |
1994年 | 35篇 |
1993年 | 40篇 |
1992年 | 32篇 |
1991年 | 21篇 |
1990年 | 13篇 |
1989年 | 31篇 |
1988年 | 33篇 |
1987年 | 13篇 |
1986年 | 19篇 |
1985年 | 19篇 |
1984年 | 9篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 12篇 |
1980年 | 7篇 |
1979年 | 7篇 |
1978年 | 12篇 |
1977年 | 6篇 |
1976年 | 9篇 |
1974年 | 8篇 |
排序方式: 共有5576条查询结果,搜索用时 171 毫秒
111.
Muhammad Ahsan Razaq Muhammad Rehan Muntazir Hussain Shakeel Ahmed Keum-Shik Hong 《Asian journal of control》2023,25(5):4096-4112
This paper investigates a local observer-based leader-following consensus control of one-sided Lipschitz (OSL) multi-agent systems (MASs) under input saturation. The proposed consensus control scheme has been formulated by using the OSL property, input saturation, directed graphs, estimated states, and quadratic inner-boundedness condition by attaining the regional stability. It is assumed that the graph always includes a (directed) spanning tree with respect to the leader root to develop matrix inequalities for investigating parameters of the proposed observer and consensus protocols. Further, a new observer-based consensus tracking method for MASs with saturation, concerning independent topologies for communicating outputs and estimates over the network, is explored to deal with a more perplexing and realistic situation. In contrast to the traditional methods, the proposed consensus approach considers output feedback and deals with the input saturation for a generalized class of nonlinear systems. The efficiency of the obtained results is illustrated via application to a group of five moving agents in the Cartesian coordinates. 相似文献
112.
Wireless Personal Communications - Multimodal biometric systems combine feature knowledge from multiple traits to overcome shortcomings of unimodal systems. However, most of the traditional... 相似文献
113.
Hussain Naziya Maheshwary Priti Shukla Piyush Kumar Singh Anoop 《Wireless Personal Communications》2022,126(4):2841-2868
Wireless Personal Communications - A Greedy Perimeter Coordinator Routing and Mobility Awareness (GPCR-MA) vehicular routing is a widely accepted routing protocol for VANET (Vehicular Ad hoc... 相似文献
114.
Jie Song Pengyi Zhang Mohammed Alkubati Yubin Bao Ge Yu 《Digital Communications & Networks》2022,8(4):466-475
Due to the complexity of blockchain technology, it usually costs too much effort to build, maintain and monitor a blockchain system that supports a targeted application. To this end, the emerging “Blockchain as a Service” (BaaS) makes the blockchain and distributed ledgers more accessible, particularly for businesses, by reducing costs and overheads. BaaS combines the high computing power of cloud computing, the pervasiveness of IoT and the decentralization of blockchain, allowing people to build their own applications while ensuring the transparency and openness of the system. This paper surveys the research outputs of both academia and industry. First, it introduces the representative architectures of BaaS systems and then summarizes the research contributions of BaaS from the technologies for service provision, roles, container and virtualization, interfaces, customization and evaluation. The typical applications of BaaS in both academic and practical domains are also introduced. At present, the research on the blockchain is abundant, but research on BaaS is still in its infancy. Six challenges of BaaS are concluded in this paper for further study directions. 相似文献
115.
Engineering with Computers - The study is investigated the capacity of new artificial intelligence (AI) methodologies for shear strength (Vs) computation of reinforced concrete (RC) beams. The... 相似文献
116.
Wang Ankang Sahandabadi Sahereh Harrison Tyler Spicer Dean Ahamed Mohammed Jalal 《Microsystem Technologies》2022,28(11):2529-2539
Microsystem Technologies - The dynamic performance of a micro-resonator depends on its energy loss mechanism which is quantified by Q-factor (Quality factor). This paper presents numerical... 相似文献
117.
Salam Al-E’mari Mohammed Anbar Yousef Sanjalawe Selvakumar Manickam Iznan Hasbullah 《计算机系统科学与工程》2022,40(1):87-102
Intrusion detection systems that have emerged in recent decades can identify a variety of malicious attacks that target networks by employing several detection approaches. However, the current approaches have challenges in detecting intrusions, which may affect the performance of the overall detection system as well as network performance. For the time being, one of the most important creative technological advancements that plays a significant role in the professional world today is blockchain technology. Blockchain technology moves in the direction of persistent revolution and change. It is a chain of blocks that covers information and maintains trust between individuals no matter how far apart they are. Recently, blockchain was integrated into intrusion detection systems to enhance their overall performance. Blockchain has also been adopted in healthcare, supply chain management, and the Internet of Things. Blockchain uses robust cryptography with private and public keys, and it has numerous properties that have leveraged security’s performance over peer-to-peer networks without the need for a third party. To explore and highlight the importance of integrating blockchain with intrusion detection systems, this paper provides a comprehensive background of intrusion detection systems and blockchain technology. Furthermore, a comprehensive review of emerging intrusion detection systems based on blockchain technology is presented. Finally, this paper suggests important future research directions and trending topics in intrusion detection systems based on blockchain technology. 相似文献
118.
D. Roy R. Saini P. K. Singh P. Kumar M. Hussain 《Materials and Manufacturing Processes》2017,32(4):365-372
This study was undertaken to observe the effect of nano-composite coating on steel surface for enhancing its tribological properties. In the investigation, EN31 steel surfaces were coated with nano-composite (Ni-WS2) by pulse current co-deposition process in order to improve the tribological properties of the surface. The coatings were prepared according to different parameter settings. The effect of variations on coating thickness, microstructure, surface morphology, microhardness and tribological properties was observed. The maximum coating thickness of 117?µm with 8% by weight of WS2 particle concentration could be attained with the following parameter settings: applied voltage: 5?V; pulse frequency: 20?Hz; WS2 concentration: 20?g/l; duty factor: 0.6 and bath temperature: 50°C. The average friction coefficient of the deposited surface was 0.11, which is significantly less than that of the EN31 steel surface (average coefficient of friction >?0.5). 相似文献
119.
P. Kumar P. K. Singh D. Kumar Ved Prakash M. Hussain 《Materials and Manufacturing Processes》2017,32(5):564-572
This article explains production of nickel nanoparticles through a micro-electrical discharge machining (EDM) process with a combination of different process parameters. The production of nickel nanoparticles was carried out in a dielectric medium (deionized water) with developed micro-EDM while polyvinyl alcohol worked as the stabilizing agent. The characterization of nickel nanoparticle was done by scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), UV–Vis spectroscopy, and Fourier transform infrared (FTIR) analysis. From this investigation, the mean crystal size of the nickel nanoparticles was found to be in the range of 15–20?mm for a pulse-on time variation of 2–0.3?µs and the crystal size was found to decrease with the decrease of pulse-on time. It was also observed that with this decrease, the shape and size of nickel nanoparticles change from spherical to needle-like. The dispersion stability of nickel nanofluid was determined by viscosity measurements and the dynamic viscosity was noted to decrease by decreasing the pulse duration. From the FTIR spectrum results, it was confirmed that the synthesized nickel nanoparticles in deionized water were pure and monolithic. UV–Vis–NIR spectroscopy depicted that the band gap energy increases with a reduction in the pulse-on time and obtains a higher band gap (5.31?eV) for 0.3?µs pulse-on time. 相似文献
120.
Influence of religiosity and spiritual coping on health‐related quality of life in Saudi haemodialysis patients
下载免费PDF全文
![点击此处可从《Hemodialysis international. International Symposium on Home Hemodialysis》网站下载免费的PDF全文](/ch/ext_images/free.gif)