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排序方式: 共有72条查询结果,搜索用时 93 毫秒
1.
Hak-Yoon Kim Insoo Choi Sang Hyun Ahn Seung Jun Hwang Sung Jong Yoo Jonghee Han Jihyun Kim Hansoo Park Jong Hyun Jang Soo-Kil Kim 《International Journal of Hydrogen Energy》2014
Electrochemical reduction of CO2 to HCOOH was performed on a Sn electrode using a proton exchange membrane-embedded electrolysis cell. The effects of reaction conditions such as catholyte and anolyte types, reduction potential, catholyte pH, and reaction temperature on the amount of HCOOH and its faradaic efficiency were investigated. Four different electrolytes (KOH, KHCO3, KCl, KHSO4) were chosen as the candidate catholyte and anolyte; the most suitable electrolyte was chosen by monitoring the amount of HCOOH and faradaic efficiency. The effect of the pH of the selected catholyte on the conversion of CO2 to HCOOH was also investigated. In addition, the reaction temperature was varied and its effect was studied. From the observations made, we determined the optimal reaction conditions for the production of HCOOH via the electrochemical reduction of CO2 by a systematic approach. 相似文献
2.
Wireless Personal Communications - Cognitive radio networks (CRNs) have a shortcoming in that attackers can increase their ability to disturb secondary users (SUs). This paper focuses on jamming... 相似文献
3.
Insoo Kim Yeung-Shik Kim Eun-Cheol Park 《International Journal of Precision Engineering and Manufacturing》2009,10(3):43-49
This paper proposes a new modeling scheme to describe the hysteresis and the preload characteristics of piezoelectric stack
actuators in the inchworm. From the analysis of piezoelectric stack actuator behavior, the hysteresis can be described by
the functions of a maximum input voltage and the preload. The dynamic characteristics are also identified by the frequency
domain modeling technique based on the experimental data. The hysteresis is compensated by the inverse hysteresis model for
precise control of inchworm displacement. Since the dynamic stiffness of an inchworm is generally low compared to its driving
condition, the mechanical vibration may degrade accuracy of the inchworm. Therefore, the SMC (Sliding Mode Control) and the
Kalman filter are developed for the motion control of the inchworm. The feasibility of the proposed modeling scheme and the
control algorithm is tested and verified experimentally. 相似文献
4.
5.
Sohn Insoo Gupta Someshwar C. 《International Journal of Wireless Information Networks》1999,6(2):59-66
With increasing need for capacity in mobilecellular communications, code division multiple accesshas been viewed as the technique to meet this goal.However, the conventional receiver suffers frommultiuser interference and the near-far effect. Toalleviate this problem, various multiuser receivers havebeen proposed. They have been shown to enhance theperformance of the conventional receiver with respect to capacity and interference rejection. Butthese receivers, intended for Gaussian noise channels,can fail in other environments such as impulsive noiseconditions. A possible solution is to exploit the advantages of neural networks. A neuralnetwork's ability to reject non-Gaussian noise can beutilized to implement multiuser receivers that rejectboth impulsive noise and multiuser interference.Following this logic, this paper considers nonadaptivemultiuser receiver and adaptive multiuser receiver basedon radial basis function neural networks. Simulations ofthese receivers show results that are superior to previously studied multiuser receivers, withrespect to practicality and performance. 相似文献
6.
In this paper, we tested multi-mode optical fibers to select a suitable fiber for effective flow of cell cytometry. In order to align micro nozzle and multi-mode optical fibers, a guide channel was fabricated by silicon wafer etching with MEMS (Micro Electro-Mechanical System) technologies. The fabricated system is advantageous due to its low cost and simplicity in construction. It is possible because multi-mode optical fibers replace many optical lenses and expensive equipment. As a result of the flow cell cytometry using multi-mode optical fibers for both input and output, it is easy to align and we can reduce power consumption. The sensitivity of the micro flow cell cytometry is much better than other cytometries. The output voltage was as high as 300 mV. We injected various cells through the designed and fabricated flow cell cytometry, and we were able to detect cells. Every cell has its own cellulose and wall which cause different light permeability; therefore, we could get different voltage characteristics according to different cells. From the experimental results, we were able to count the number of cells and differentiate the relative size of the injected cells; therefore, we can use the micro flow cell cytometry for analyzing cells [1, 2]. 相似文献
7.
Insoo Kim 《Metals and Materials International》1996,2(3):169-177
The plastic strain ratios of planar isotropic sheet specimens were studied by using unidirectionally solidified commercial Al. Sn and Al-Cu alloy sheets and Cu sheets electrodeposited under the various electrolysis conditions. The measured plastic strain ratios of [100] planar isotropic sheets by using unidirectionally solidified Al and Al-Cu alloy are about 0.17–0.52, that of [110] planar isotropic sheets using unidirectionally solidified Sn(BCT) are about 2.5, that of [110] planar isotropic sheets using electrodeposited Cu are 1.38–2.05 and that of [111] planar isotropic sheets using electrodeposited Cu are 2.61–2.85. There is a substantial discrepancy between the experimental plastic strain ratios which are measured from planar isotropic sheets and theoretical plastic strain ratios which are calculated by Backofen method and Bunge method, but the measured plastic strain ratio of [100] planar isotropic sheet using unidirectionally solidified Al and Al-Cu alloy is in good agreement with Bunge method and the measured plastic strain ratio of [110] and [111] planar isotropic sheets using electrodeposited Cu are in good agreement with Backofen method. 相似文献
8.
The punch load and strain distribution of two deformed sheet steels, aluminum killed drawing quality steel (AKDQ Bare) and
electro-galvanized drawing quality steel (AKDQ E.G.), are examined under the various process conditions including, die materials,
punch speed, blank holding force, drawbead height and lubricant. The punch load and strain distribution ot Bare sheet steel
forming is higher than that of E.G.sheet steel on the Kirkesite die set and are reversed on the GM 241 die set. The punch
load and strain distribution on the Kirkesite die set is lower than those of the GM 241 die set. The changes of punch load
and strain distribution ot the deformed cup for two sheet steels are affected by the frictional behavior of each sheet steel.
It shows that the changes of frictional behavior having to be considered in the die design. 相似文献
9.
Bi-zhi Dai Zai-xuan Zhang Chen-xia Li Hong-ling Liu Jian-feng Wang Insoo S. Kim 《光电子快报》2006,2(1):9-11
IPTV,video-phone,video-conference,distance learn-ing,distance medical ,e-governmental affairs ,etc .will be-come commonthings in people' s daily life with the fastdevelopment of Internet technology.During this processextra-capacity of fiber communication … 相似文献
10.
Choi MY Choi DJ Ahn KO Ro I Kim YH Suh SH 《Journal of nanoscience and nanotechnology》2012,12(4):3637-3640
We investigated the imidization of a polyimide (PI) and the formation of Cu nanoparticles in a PI film by curinga precursor of PI (polyamic acid (PAA) dissolved in n-methyl-2-pyrrolidinone) in a reducing atmosphere in the rapid thermal annealing (RTA) system. A Cu film was deposited onto the SiO2/Si substrate, and the PAA was spin-coated onto the Cu film. After the PAA reacted with the Cu film, soft-baking was performed to evaporate the solvent. Finally, the PAA was imidized to PI at 450 degrees C by curing in a reducing atmosphere with the RTA. Fourier transform infrared spectroscopy showed that the PAA was successfully imidized by the RTA. X-ray diffraction patterns revealed that Cu nanoparticles formed by RTA curing at 450 degrees C for 5 minutes in a reducing atmosphere, and transmission electron microscopy showed that Cu nanoparticles about 6.5 nm in size were uniformly dispersed in the PI film. Curing by RTA is an attractive method because it takes only a few minutes. 相似文献