全文获取类型
收费全文 | 331篇 |
免费 | 23篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 61篇 |
金属工艺 | 10篇 |
机械仪表 | 17篇 |
建筑科学 | 14篇 |
能源动力 | 12篇 |
轻工业 | 8篇 |
水利工程 | 2篇 |
石油天然气 | 1篇 |
无线电 | 44篇 |
一般工业技术 | 69篇 |
冶金工业 | 18篇 |
原子能技术 | 1篇 |
自动化技术 | 97篇 |
出版年
2024年 | 2篇 |
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 15篇 |
2020年 | 13篇 |
2019年 | 22篇 |
2018年 | 21篇 |
2017年 | 24篇 |
2016年 | 24篇 |
2015年 | 12篇 |
2014年 | 22篇 |
2013年 | 31篇 |
2012年 | 14篇 |
2011年 | 20篇 |
2010年 | 23篇 |
2009年 | 22篇 |
2008年 | 14篇 |
2007年 | 20篇 |
2006年 | 12篇 |
2005年 | 12篇 |
2004年 | 4篇 |
2003年 | 4篇 |
2002年 | 4篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
排序方式: 共有359条查询结果,搜索用时 31 毫秒
51.
Chakraborty Malay Dey Tina Bera Kamal Kanti Roy Partha Sarathi Ghorai Kalyan Hossain Akbar Bhattacharya Swapan Kumar 《Journal of Materials Science》2022,57(3):2021-2038
Journal of Materials Science - Palladium–bismuth oxoiodide nanocomposites of various molar ratios of Pd and BiOI have been synthesized by the facile solvothermal method following the chemical... 相似文献
52.
53.
Kumar Pradeep Saini Rajkumar Roy Partha Pratim Dogra Debi Prosad 《Multimedia Tools and Applications》2018,77(7):8823-8846
Multimedia Tools and Applications - Sign language is the only means of communication for speech and hearing impaired people. Using machine translation, Sign Language Recognition (SLR) systems... 相似文献
54.
Partha?GhoshEmail author Kalyani?Mali Sitansu?K.?Das 《Pattern Recognition and Image Analysis》2018,28(3):400-409
Superpixel segmentation methods are generally used as a pre-processing step to speed up image processing tasks. They group the pixels of an image into homogeneous regions while trying to respect existing contours. In this paper, we propose a fast Superpixels segmentation algorithm with Contour Adherence using spectral clustering, combined with normalized cuts in an iterative k-means clustering framework. It produces compact and uniform superpixels with low computational costs. Normalized cut is adapted to measure the color similarity and space proximity between image pixels. We have used a kernel function to estimate the similarity metric. Kernel function maps the pixel values and coordinates into a high dimensional feature space. The objective functions of weighted K-means and normalized cuts share the same optimum point in this feature space. So it is possible to optimize the cost function of normalized cuts by iteratively applying simple K-means clustering algorithm. The proposed framework produces regular and compact superpixels that adhere to the image contours. On segmentation comparison benchmarks it proves to be equally well or better than the state-of-the-art super pixel segmentation algorithms in terms of several commonly used evaluation metrics in image segmentation. In addition, our method is computationally very efficient and its computational complexity is linear. 相似文献
55.
Rinku Rani Das Santanu Maity Atanu Choudhury Apurba Chakraborty C. T. Bhunia Partha P. Sahu 《Journal of Computational Electronics》2018,17(3):1001-1012
The remarkable development and continual proliferation of research in the nanotechnology field have led to improvement in the efficiency of elementary devices. To improve their performance, the parameters of such devices can be scaled down while optimizing their characteristics. However, this simultaneously results in degraded switching characteristics and the appearance of short-channel effects. Multigate-based fin-shaped field-effect transistors (FinFETs) represent a new option to address all these problems. However, thermal failure of FinFET devices under nominal operating conditions is an important issue in the design and implementation of high-speed semiconductor devices. It is also seen that bulk FinFETs exhibit better thermal performance compared with silicon-on-insulator FinFETs. In the work presented herein, various FinFET characteristics including the subthreshold swing, drain-induced barrier lowering, threshold voltage, and drain current were investigated as functions of temperature. The (effective) channel length is larger than the physical gate length (in off-state) due to the undoped underlap regions. This paper also discusses the effects of drain, source, and gate overlap. 相似文献
56.
Amir R. Hanifi Navjot K. Sandhu Thomas H. Etsell Partha Sarkar 《Journal of the American Ceramic Society》2017,100(11):4983-4987
A new proton conducting fuel cell design based on the BZCYYb electrolyte is studied in this research. In high‐performance YSZ‐based SOFCs, the Ni‐YSZ support plays a key role in providing required electrical properties and robust mechanical behavior. In this study, this well‐established Ni‐YSZ support is used to maintain the proton conducting fuel cell integrity. The cell is in a Ni‐YSZ (375 μm support)/Ni‐BZCYYb (20 μm anode functional layer)/BZCYYb (10 μm electrolyte)/LSCF‐BZCYYb (25 μm cathode) configuration. Maximum power density values of 166, 218, and 285 mW/cm2 have been obtained at 600°C, 650°C, and 700°C, respectively. AC impedance spectroscopy results show values of 2.17, 1.23, and 0.76 Ω·cm2 at these temperatures where the main resistance contributor above 600°C is ohmic resistance. Very fine NiO and YSZ powders were used to achieve a suitable sintering shrinkage which can enhance the electrolyte sintering. During cosintering of the support and BZCYYb electrolyte layers, the higher shrinkage of the support layer led to compressive stress in the electrolyte, thereby enhancing its densification. The promising results of the current study show that a new generation of proton conducting fuel cells based on the chemically and mechanically robust Ni‐YSZ support can be developed which can improve long‐term performance and reduce fabrication costs of proton conducting fuel cells. 相似文献
57.
Partha Chakroborty Kalyanmoy Deb & B. Srinivas 《Computer-Aided Civil and Infrastructure Engineering》1998,13(5):363-376
The primary objective of any transit system is to provide a better level of service to its passengers. One of the good measures of level of service is the waiting time of passengers during their journey. The waiting time consists of an initial waiting time (the time a passenger waits to board a vehicle at his or her point of origin) and a transfer time (the time a passenger waits at a transfer station while transferring from one vehicle to another). An efficient schedule minimizes the overall transfer time (TT) of passengers transferring between different routes as well as the initial waiting time (IWT) of the passengers waiting to board the vehicle at their point of origin. This paper uses genetic algorithm (GA)—a search and optimization procedure—to find optimal/near-optimal schedules of vehicles in a transit network. The main advantage of using GA is that the transit network scheduling problem can be reformulated in a manner that is computationally more efficient than the original problem. Further, the coding aspect of GA inherently takes care of most of the constraints associated with the scheduling problem. Results from a number of test problems show that GAs are able to find optimal/near-optimal schedules with minimal computational resources. 相似文献
58.
Genetic Algorithms for Optimal Urban Transit Network Design 总被引:1,自引:0,他引:1
Partha Chakroborty 《Computer-Aided Civil and Infrastructure Engineering》2003,18(3):184-200
This article attempts to highlight the effectiveness of genetic algorithm (GA)–based procedures in solving the urban transit network design problem (UTNDP). The article analyzes why traditional methods have problems in solving the UTNDP. The article also suggests procedures to alleviate these problems using GA–based optimization technique. The thrust of the article is three–fold: (1) to show the effectiveness of GAs in solving the UTNDP, (2) to identify features of the UTNDP that make it a difficult problem for traditional techniques, and (3) to suggest directions, through the presentation of GA–based methodologies for the UTNDP, for the development of GA–based procedures for solving other optimization problems having features similar to the UTNDP. 相似文献
59.
60.
Kalyan Mondal Biplab Bag Partha Pratim Sarkar 《International Journal of Communication Systems》2024,37(5):e5688
A small size, dual-band and dual-sense monopole antenna is proposed to improve the axial ratio bandwidth (ARBW). The proposed antenna is considered on a low-cost lossy FR4 substrate with parasitic strips (PSs) and partial ground plane of half guided wavelength dimensions. The dimension of the antenna in terms of wavelength is , where is the wavelength at the lowest resonant frequency. The circularly polarized (CP) mode is created for strong orthogonal electric fields and . The obtained phase difference (PD) between two electric fields and is varied from to under ARBW. The achieved ARBW is 3.68–3.8 GHz, 4.84–12.58 GHz, and impedance bandwidth (IBW) is 3.51–3.82 GHz and 4.28–15 GHz. The applications of the proposed antenna are International Telecommunication Union (ITU) for 5G, C-band IEEE 802.11a wireless local area network (WLAN) at 5 GHz (5.15–5.825 GHz) and X-band wireless systems. 相似文献