全文获取类型
收费全文 | 2931篇 |
免费 | 201篇 |
国内免费 | 11篇 |
专业分类
电工技术 | 63篇 |
综合类 | 3篇 |
化学工业 | 609篇 |
金属工艺 | 102篇 |
机械仪表 | 209篇 |
建筑科学 | 62篇 |
矿业工程 | 3篇 |
能源动力 | 131篇 |
轻工业 | 223篇 |
水利工程 | 10篇 |
石油天然气 | 2篇 |
无线电 | 561篇 |
一般工业技术 | 593篇 |
冶金工业 | 221篇 |
原子能技术 | 34篇 |
自动化技术 | 317篇 |
出版年
2024年 | 3篇 |
2023年 | 39篇 |
2022年 | 44篇 |
2021年 | 83篇 |
2020年 | 77篇 |
2019年 | 76篇 |
2018年 | 97篇 |
2017年 | 99篇 |
2016年 | 103篇 |
2015年 | 90篇 |
2014年 | 138篇 |
2013年 | 147篇 |
2012年 | 188篇 |
2011年 | 219篇 |
2010年 | 181篇 |
2009年 | 192篇 |
2008年 | 144篇 |
2007年 | 150篇 |
2006年 | 116篇 |
2005年 | 113篇 |
2004年 | 97篇 |
2003年 | 83篇 |
2002年 | 80篇 |
2001年 | 65篇 |
2000年 | 66篇 |
1999年 | 57篇 |
1998年 | 99篇 |
1997年 | 78篇 |
1996年 | 34篇 |
1995年 | 36篇 |
1994年 | 16篇 |
1993年 | 24篇 |
1992年 | 18篇 |
1991年 | 17篇 |
1990年 | 13篇 |
1989年 | 14篇 |
1988年 | 11篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1975年 | 3篇 |
1973年 | 1篇 |
排序方式: 共有3143条查询结果,搜索用时 15 毫秒
131.
Man Hoi Koo Hong Seok Lim Hak In Gimm Hong Hee Yoo 《Journal of Mechanical Science and Technology》2009,23(4):964-967
A new manufacturing technology is being employed to build a new type of armored vehicle. While thick panels are welded together
in the old manufacturing technology, relatively thin panels are welded to a frame structure in the new manufacturing technology.
The structural integrity of the new type of armor vehicles can be maintained mainly by the frame structures while the panel
thickness is reduced significantly to reduce the total vehicle weight. Since the dynamic characteristics of a frame-panel
hybrid structure are different from those of the old type of structure which consists of only thick panels, they should be
identified to achieve a good performance of the vehicle. For this purpose, a proper FE model of the hybrid type of structure
needs to be developed. In the present study, FE models are proposed to represent the frame-panel hybrid type structure efficiently.
The impact energy propagation, the transient response and the modal characteristics are investigated with the FE models.
This paper was presented at the 4th Asian Conference on Multibody Dynamics(ACMD2008), Jeju, Korea, August 20–23, 2008.
Hong-Hee Yoo received a B.S. and M.S. degree in Mechanical Engineering from Seoul National University in 1980 and 1982. He then went on
to receive his Ph.D. degree from Michigan State University in 1989. Dr. Yoo is currently a Professor at the School of Mechanical
Engineering at Hanyang University in Seoul, Korea. His research interests are in the area of Flexible body dynamics, vibration. 相似文献
132.
Efficient Photocatalytic H2 Evolution: Controlled Dewetting–Dealloying to Fabricate Site‐Selective High‐Activity Nanoporous Au Particles on Highly Ordered TiO2 Nanotube Arrays 下载免费PDF全文
133.
Prakash Parthasarathy Hang Seok Choi Hoon Chae Park Jae Gyu Hwang Ho Seong Yoo Byeong-Kyu Lee Mukesh Upadhyay 《Korean Journal of Chemical Engineering》2016,33(8):2268-2286
Waste tyres have become a grave concern as their accumulation is aggregating every year. Not only the size of waste tyre has to be reduced, but also some useful energy has to be recovered out of it as the world badly requires energy from alternate sources. Pyrolysis is one such method to extract energy potential products from waste tyres. It is extensively used to generate carbon black (solid product), tyre-oil (liquid product) and syngas (gas product) from waste tyres. In that connection, this article discusses the effect of various parameters on the product composition of pyrolysis of waste tyres. The current usage of pyrolysis products and their typical characteristics are also discussed in this critique. Of late, extraction of high value added products, such as activated carbon from carbon black, and limonene from tyre-oil is gaining attention. The article also throws some light on the application and generation routes of activated carbon and limonene from waste tyres. 相似文献
134.
Kwiyong Kim Chung-Yul Yoo Jong-Nam Kim Hyung Chul Yoon Jong-In Han 《Korean Journal of Chemical Engineering》2016,33(6):1777-1780
Nano-Fe2O3 and CoFe2O4 were suspended in molten salt of alkali-metal chloride (LiCl-KCl-CsCl) and their catalytic activity in electrochemical ammonia synthesis was evaluated from potentiostatic electrolysis at 600 K. The presence of nanoparticle suspension in the molten chloride resulted in improved production of NH3, recording NH3 synthesis rate of 1.78×10?10 mol s?1 cm?2 and 3.00×10?10 mol s?1 cm?2 with CoFe2O4 and Fe2O3, which are 102% and 240% higher than that without the use of a nanocatalyst, respectively. We speculated that the nanoparticles triggered both the electrochemical reduction of nitrogen and also chemical reaction between nitrogen and hydrogen that was produced from water electro-reduction on cathode. The use of nanocatalysts in the form of suspension offers an effective way to overcome the sluggish nature of nitrogen reduction in the molten chloride electrolyte. 相似文献
135.
136.
Kee-Youn Yoo Jun-Soo Park Myung-June Park 《Korean Journal of Chemical Engineering》2016,33(4):1153-1158
Carbon capture and storage (CCS) technologies are a cornerstone for reducing CO2 emissions from energy and energy-intensive industries. Among the various CCS technologies, solid sorbent looping systems are considered to be potentially promising solutions for reducing CO2 capture energy penalty. We present an evaluation module for a carbonator with sorbent looping cycle to calculate the carbonation efficiency. The module incorporates a simple sorbent activity model, and the solid/gas balances are constructed by assuming simple reactor mixing quality. By conducting simulations, we examine the variation in the carbonation efficiencies as a function of the sorbent looping operation factors and discuss an optimum operating strategy. 相似文献
137.
Siti Fauziyah Rahman Kyoungseon Min Seok-Hwan Park Jae-Hee Park Jin Cheol Yoo Don-Hee Park 《Korean Journal of Chemical Engineering》2016,33(12):3442-3447
Dopamine (3,4-dihydroxylphenyl ethylamine) is the most significant neurotransmitter in the human nervous system. Abnormal dopamine levels cause fatal neurological disorders, and thus measuring dopamine level in actual samples is important. Although electrochemical methods have been developed for detecting dopamine with high accuracy, certain substances (e.g., ascorbic acid) in actual samples often interfere with electrochemical dopamine detection. We developed tyrosinase-based dopamine biosensor with high sensitivity and selectivity. An electrochemically pretreated tyrosinase/multi-walled carbon nanotube-modified glassy carbon electrode (tyrosinase/MWNT/GCE) was prepared as an amperometric biosensor for selective dopamine detection. For optimizing the biosensor performance, pH, temperature, and scan rate were investigated. The electrochemically pretreated tyrosinase/MWNT/GCE exhibited not only the highest sensitivity (1,323 mAM?1 cm?2) compared to previously reported tyrosinase-based dopamine sensors, but also good long-term stability, retaining 90% of initial activity after 30 days. Additionally, ascorbic acid, a major interfering substances, was not oxidized at the potential used to detect dopamine oxidation, and the interfering effect of 4mM ascorbic acid was negligible when monitoring 1mM dopamine. Consequently, the electrochemically pretreated tyrosinase/MWNT/GCE is applicable for highly selective and sensitive dopamine detection in actual samples including interfering substances, thereby extending the practical use to monitor and diagnose neurological disorders. 相似文献
138.
Prithvi Sai Nadh Garikiparthy Seung Chul Lee Hongbin Liu Srinivas Sahan Kolluri Iman Janghorban Esfahani Chang Kyoo Yoo 《Korean Journal of Chemical Engineering》2016,33(1):14-24
We developed several control algorithms and compare their control performances for controlling the total phosphorous (TP) concentration in wastewater treatment plant, which has strong influent disturbances and the disturbance effects should be removed while maintaining better effluent quality. An anaerobic - anoxic - oxic (AAO) process, which is a well-known advanced nutrient removal process, was selected as a case study, which is modeled with activated sludge model no. 2. Six control strategies for TP control with a polymer addition were implemented in AAO process and evaluated by the plant’s performance, where the costs of the dosed chemical were compared among the six controllers. The experimental work showed that the advanced control techniques with feedback, feedforward and feedratio controllers were able to control the TP concentration in the effluent, which must be less than 1.50 g P/m3 which is the legal limitation, while reducing the necessary chemical cost. The results showed that the best TP removal performance in the effluent TP removal could be achieved by advanced feedback controller with the tuned control parameters, which showed the best effluent quality and control performance index as well as the cheapest cost of chemical dosage among the six TP control strategies. 相似文献
139.
Kunwoo Kim Jaewook Lee Jinseok Jang Myeongsik Jeong Jooyoung Oh Hoon Kang Jiheon Kang Hyungryul Kim Wansuk Yoo 《Journal of Mechanical Science and Technology》2016,30(12):5413-5422
The manufacturing process of long fiber thermoplastic is initiated by supplying reinforced fiber wound in a spool dispenser. If problems such as tangling or kinking occur in the apparatus used for supplying the reinforced fiber in the long-fiber thermoplastic direct process, the productivity of the long-fiber thermoplastic decreases. Therefore, it is important to enhance the supply stability of reinforced fiber. In general, the increase in supply stability can be achieved by maintaining a steady balloon shape that is controlled by the unwinding velocity or tensile force of the reinforced fiber. In this research, the range of suitable tensile force was determined under the assumption that the unwinding velocity remained constant. The reinforced fiber was assumed to be inextensible, homogeneous, and isotropic and to have uniform density. The transient-state unwinding equation of motion to analyze the unwinding motion of reinforced fiber can be derived by using Hamilton’s principle for an open system in which mass can change within a control volume. In the process of solving the transient-state unwinding equation of motion, the exact two-point boundary conditions are adopted for each time step. 相似文献
140.
Min Jung Yoo Matthew Stanley Ambrosia Tae Woo Kwon Joonkyung Jang Man Yeong Ha 《Journal of Mechanical Science and Technology》2018,32(4):1593-1600
A numerical study was carried out using a molecular dynamics program to examine the wetting characteristics of nano-sized water droplets on surfaces with various pillar surface fractions under different conditions. Square-shaped pillars had surface fractions that increased from 11.1 % to 69.4 %. The pillars had 4 different heights and 3 different surface energies. When the pillar surface fraction changed, the contact angle of a water droplet also changed due to the attraction between the droplet and the pillar surface or the inner attraction of the water molecules. The pillar height also has different effects on the water droplet depending on the magnitude of surface energy. 相似文献