全文获取类型
收费全文 | 3041篇 |
免费 | 192篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 36篇 |
综合类 | 9篇 |
化学工业 | 647篇 |
金属工艺 | 111篇 |
机械仪表 | 81篇 |
建筑科学 | 46篇 |
矿业工程 | 1篇 |
能源动力 | 78篇 |
轻工业 | 133篇 |
水利工程 | 6篇 |
石油天然气 | 4篇 |
无线电 | 353篇 |
一般工业技术 | 411篇 |
冶金工业 | 1084篇 |
原子能技术 | 28篇 |
自动化技术 | 211篇 |
出版年
2023年 | 27篇 |
2022年 | 52篇 |
2021年 | 62篇 |
2020年 | 51篇 |
2019年 | 71篇 |
2018年 | 74篇 |
2017年 | 96篇 |
2016年 | 117篇 |
2015年 | 63篇 |
2014年 | 87篇 |
2013年 | 131篇 |
2012年 | 158篇 |
2011年 | 175篇 |
2010年 | 116篇 |
2009年 | 115篇 |
2008年 | 104篇 |
2007年 | 92篇 |
2006年 | 83篇 |
2005年 | 63篇 |
2004年 | 46篇 |
2003年 | 56篇 |
2002年 | 54篇 |
2001年 | 37篇 |
2000年 | 44篇 |
1999年 | 52篇 |
1998年 | 394篇 |
1997年 | 210篇 |
1996年 | 144篇 |
1995年 | 75篇 |
1994年 | 40篇 |
1993年 | 75篇 |
1992年 | 15篇 |
1991年 | 17篇 |
1990年 | 15篇 |
1989年 | 24篇 |
1988年 | 15篇 |
1987年 | 14篇 |
1986年 | 14篇 |
1985年 | 11篇 |
1984年 | 5篇 |
1983年 | 7篇 |
1982年 | 16篇 |
1981年 | 12篇 |
1980年 | 10篇 |
1979年 | 6篇 |
1977年 | 13篇 |
1976年 | 69篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 2篇 |
排序方式: 共有3239条查询结果,搜索用时 0 毫秒
51.
Stephen Abell Nhan Do 《International Journal of Parallel, Emergent and Distributed Systems》2016,31(5):450-468
This article presents a GPU-based single-unit deadlock detection methodology and its algorithm, GPU-OSDDA. Our GPU-based design utilizes parallel hardware of GPU to perform computations and thus is able to overcome the major limitation of prior hardware-based approaches by having the capability of handling thousands of processes and resources, whilst achieving real-world run-times. By utilizing a bit-vector technique for storing algorithm matrices and designing novel, efficient algorithmic methods, we not only reduce memory usage dramatically but also achieve two orders of magnitude speedup over CPU equivalents. Additionally, GPU-OSDDA acts as an interactive service to the CPU, because all of the aforementioned computations and matrix management techniques take place on the GPU, requiring minimal interaction with the CPU. GPU-OSDDA is implemented on three GPU cards: Tesla C2050, Tesla K20c, and Titan X. Our design shows overall speedups of 6-595X over CPU equivalents. 相似文献
52.
53.
Do?Yeon?Kim Guozhong?Li Seong?Taek?Park Mi?Hyun?KoEmail author 《Journal in Computer Virology》2016,12(3):151-161
This paper analyzed the effects of security risk factors fit for cloud computing paradigm on the acceptance of enterprise cloud service with intent to illuminate the factors for vitalizing the adoption of corporate cloud services in the future. The acceptance intention was set as a dependent variable. Independent variables were set in reference to the technology acceptance theory. Security risks were categorized into compliance risk, information leakage risk, troubleshooting risk and service discontinuation risk to design a model for analysis. 相似文献
54.
Juha K. Laurila Daniel Gatica-Perez Imad Aad Jan Blom Olivier Bornet Trinh Minh Tri Do Olivier Dousse Julien Eberle Markus Miettinen 《Pervasive and Mobile Computing》2013,9(6):752-771
This paper presents an overview of the Mobile Data Challenge (MDC), a large-scale research initiative aimed at generating innovations around smartphone-based research, as well as community-based evaluation of mobile data analysis methodologies. First, we review the Lausanne Data Collection Campaign (LDCC), an initiative to collect unique longitudinal smartphone dataset for the MDC. Then, we introduce the Open and Dedicated Tracks of the MDC, describe the specific datasets used in each of them, discuss the key design and implementation aspects introduced in order to generate privacy-preserving and scientifically relevant mobile data resources for wider use by the research community, and summarize the main research trends found among the 100+ challenge submissions. We finalize by discussing the main lessons learned from the participation of several hundred researchers worldwide in the MDC Tracks. 相似文献
55.
Since humans are fundamentally social beings and interact frequently with others in their daily life, understanding social context is of primary importance in building context-aware applications. In this paper, using smartphone Bluetooth as a proximity sensor to create social networks, we present a probabilistic approach to mine human interaction types in real life. Our analysis is conducted on Bluetooth data continuously sensed with smartphones for over one year from 40 individuals who are professionally or personally related. The results show that the model can automatically discover a variety of social contexts. We objectively validated our model by studying its predictive and retrieval performance. 相似文献
56.
This paper investigates the theoretical justification of intelligent digital redesign (IDR) methods based on the approximate discrete-time models. Its main purpose is to design the digital fuzzy controller achieving the minimum norm distance between the trajectories of the approximate closed-loop systems under the analog and the digital controls. It is verified that, if there exist the digital gains such that the approximate norm distance is sufficiently small, the redesigned controller makes the trajectories of the exact closed-loop systems close, or, at least, asymptotically stabilizes the plant. 相似文献
57.
KD Miller 《Canadian Metallurgical Quarterly》1994,7(4):1-12
Although Hodgkin's disease is considered one of the "curable" cancers, the high cure rates associated with this disease are not accomplished without risk of potentially severe, immediate, and late side effects. Because the predominant histologic subtype of Hodgkin's disease found in the United States generally affects the 15- to 25-year-old age group, the disease, its treatment, and the side effects of treatment will affect many women of childbearing age. The treatment and its effects on the patient and offspring, including posttreatment fertility, are key issues for perinatal nurses. 相似文献
58.
Modern medicine uses large amounts of one-way-devices. This includes mass articles as well as technically sophisticated ones, all of them in accordance with GMP (Good-manufacturing-practice) guidelines. Recycling of selected one-way devices in technically possible and economically useful. Prerequisite for recycling is the inclusion of legal, economic and ecologic points of view. In addition the validation of processes and agreement on installation of continuous quality control is necessary to minimise risks. We suggest admission of recycling and reuse of one-way devices and suggest to proceed stepwise: 1. Principal decision to permit recycling 2. Appointment of an interdisciplinary Federal Board "Medical Devices" for coordination and channelling of activities 3. Selection of products for recycling 4. Principal decision for the systematics of the process together with: process control, product control during a pre-testing stage, random tests in prospective, multi-centre studies for the control of production and use. 5. Introduction of internal quality control systems to allow internal and external control of routine work. 相似文献
59.
Bio-Inspired Artificial Fast-Adaptive and Slow-Adaptive Mechanoreceptors With Synapse-Like Functions
Hung Quang Huynh Tran Quang Trung Atanu Bag Trung Dieu Do M. Junaid Sultan Miso Kim Nae-Eung Lee 《Advanced functional materials》2023,33(42):2303535
Development of artificial mechanoreceptors capable of sensing and pre-processing external mechanical stimuli is a crucial step toward constructing neuromorphic perception systems that can learn and store information. Here, bio-inspired artificial fast-adaptive (FA) and slow-adaptive (SA) mechanoreceptors with synapse-like functions are demonstrated for tactile perception. These mechanoreceptors integrate self-powered piezoelectric pressure sensors with synaptic electrolyte-gated field-effect transistors (EGFETs) featuring a reduced graphene oxide channel. The FA pressure sensor is based on a piezoelectric poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) thin film, while the SA pressure sensor is enabled by a piezoelectric ionogel with the piezoelectric-ionic coupling effect based on P(VDF-TrFE) and an ionic liquid. Changes in post-synaptic current are achieved through the synaptic effect of the EGFET by regulating the amplitude, number, duration, and frequency of tactile stimuli (pre-synaptic pulses). These devices have great potential to serve as artificial biological mechanoreceptors for future artificial neuromorphic perception systems. 相似文献
60.