全文获取类型
收费全文 | 168篇 |
免费 | 5篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 43篇 |
金属工艺 | 1篇 |
机械仪表 | 4篇 |
建筑科学 | 1篇 |
能源动力 | 27篇 |
轻工业 | 12篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 18篇 |
一般工业技术 | 28篇 |
冶金工业 | 3篇 |
原子能技术 | 2篇 |
自动化技术 | 32篇 |
出版年
2024年 | 2篇 |
2023年 | 6篇 |
2022年 | 13篇 |
2021年 | 18篇 |
2020年 | 10篇 |
2019年 | 10篇 |
2018年 | 22篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 8篇 |
2013年 | 10篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 7篇 |
2009年 | 6篇 |
2008年 | 9篇 |
2007年 | 7篇 |
2006年 | 9篇 |
2005年 | 1篇 |
2003年 | 1篇 |
2001年 | 1篇 |
排序方式: 共有177条查询结果,搜索用时 15 毫秒
81.
Anik Kumar Ghosh Swagato Sarkar Lisa Julia Nebel Olha Aftenieva Vaibhav Gupta Oliver Sander Amit Das Joby Joseph Sven Wießner Tobias A. F. König Andreas Fery 《Advanced functional materials》2021,31(30):2101959
The next generation of sensors requires a simple yet compact lab on chip-based precise optical detection mechanism where data interpretation can be achieved with minimum effort. Hereby, cost-efficient strategies of manufacturing both propagating surface plasmon polariton (SPP) and localized surface plasmon resonance (LSPR) sensors on flexible platforms are explored via mechanical instabilities and oblique-angled metal evaporation. Centimeter scaled dielectric grating structures produced by plasma oxidation of pre-stressed polydimethylsiloxane film have comprised the substrates, thus imparting inherent flexibility. Subsequently, both continuous and discontinuous 1D-metallic lattices are obtained via vapor deposition of gold at different angles. The optical isotropy (gold surface-grating) and anisotropy (gold edge-grating) are distinctly observed as a difference between forward and backward diffraction efficiencies, backed by analytical correlation to the observed orders. Supported with electromagnetic modeling, the SPP and LSPR excitations are experimentally characterized under reflectance and transmittance measurements, along with a demonstration of their sensing capabilities. The LSPR supported flexible sensor provides superiority in terms of sensitivity, which is investigated under mechanical deformations to exhibit consistency of the resonant wavelength. Such consistency is strategically unraveled via “finite element method” based approaches, thus providing a new paradigm of cost-efficient, large-scaled flexible sensors. 相似文献
82.
R. D. Pubudu L. Indrasiri Ernesto Lee Vaibhav Rupapara Furqan Rustam Imran Ashraf 《计算机、材料和连续体(英文)》2022,71(1):489-515
Malicious traffic detection over the internet is one of the challenging areas for researchers to protect network infrastructures from any malicious activity. Several shortcomings of a network system can be leveraged by an attacker to get unauthorized access through malicious traffic. Safeguard from such attacks requires an efficient automatic system that can detect malicious traffic timely and avoid system damage. Currently, many automated systems can detect malicious activity, however, the efficacy and accuracy need further improvement to detect malicious traffic from multi-domain systems. The present study focuses on the detection of malicious traffic with high accuracy using machine learning techniques. The proposed approach used two datasets UNSW-NB15 and IoTID20 which contain the data for IoT-based traffic and local network traffic, respectively. Both datasets were combined to increase the capability of the proposed approach in detecting malicious traffic from local and IoT networks, with high accuracy. Horizontally merging both datasets requires an equal number of features which was achieved by reducing feature count to 30 for each dataset by leveraging principal component analysis (PCA). The proposed model incorporates stacked ensemble model extra boosting forest (EBF) which is a combination of tree-based models such as extra tree classifier, gradient boosting classifier, and random forest using a stacked ensemble approach. Empirical results show that EBF performed significantly better and achieved the highest accuracy score of 0.985 and 0.984 on the multi-domain dataset for two and four classes, respectively. 相似文献
83.
Variation of permittivity in radial direction in concentric half‐split cylindrical dielectric resonator antenna for wideband application 下载免费PDF全文
Raghvendra Kumar Chaudhary Kumar Vaibhav Srivastava Animesh Biswas 《国际射频与微波计算机辅助工程杂志》2015,25(4):321-329
Design and development of wideband concentric half‐split cylindrical dielectric resonator antenna (CDRA) using permittivity variation in radial direction has been proposed in this article. The homogeneous, two‐layer and three‐layer concentric half‐split CDRAs have been discussed separately. The effect of antenna parameters such as layer arrangement, geometrical parameters, and probe length are investigated. To validate the results, two‐layer and three‐layer concentric half‐split CDRA have been fabricated using commercially available microwave laminates. In each case, the input reflection coefficient, radiation pattern, and antenna gain are simulated and measured. Good agreements between simulated and measured results have been obtained. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:321–329, 2015. 相似文献
84.
Vaibhav V. Goud Anand V. Patwardhan Srikanta Dinda Narayan C. Pradhan 《European Journal of Lipid Science and Technology》2007,109(6):575-584
Karanja oil with an iodine value of 89 g/100 g was epoxidised in situ with aqueous hydrogen peroxide and acetic acid in the presence of Amberlite IR‐120 acidic ion exchange resin as catalyst. The effect of the operating variables on the oxirane oxygen content, as well as on the oxirane ring stability and the iodine value of the epoxidised karanja oil, were determined. The variables studied were stirring speed, hydrogen peroxide‐to‐ethylenic unsaturation molar ratio, acetic acid‐to‐ethylenic unsaturation molar ratio, temperature, and catalyst loading. The effects of these parameters on the conversion to the epoxidised oil were studied and the optimum conditions for the maximum oxirane content were established. The proposed kinetic model takes into consideration the two side reactions, namely, epoxy ring opening involving the formation of hydroxy acetate and hydroxyl groups, and the reaction between the peroxyacid and the epoxy group. The kinetic and adsorption constants of the rate equations were estimated by the best fit using Marquardt's algorithm. Good agreement between experimental and predicted data validates the proposed kinetic model. From the estimated kinetic constants, the apparent activation energy for the epoxidation reaction was found to be 11 kcal/mol. 相似文献
85.
Although high-performance computing has always been about efficient application execution, both energy and power consumption have become critical concerns owing to their effect on operating costs and failure rates of large-scale computing platforms. Modern processors provide techniques, such as dynamic voltage and frequency scaling (DVFS) and CPU clock modulation (called throttling), to improve energy efficiency on-the-fly. Without careful application, however, DVFS and throttling may cause a significant performance loss due to system overhead. This paper proposes a novel runtime system that maximizes energy saving by selecting appropriate values for DVFS and throttling in parallel applications. Specifically, the system automatically predicts communication phases in parallel applications and applies frequency scaling considering both the CPU offload, provided by the network-interface card, and the architectural stalls during computation. Experiments, performed on NAS parallel benchmarks as well as on real-world applications in molecular dynamics and linear system solution, demonstrate that the proposed runtime system obtaining energy savings of as much as 14 % with a low performance loss of about 2 %. 相似文献
86.
Researchers have proposed many circuit techniques to reduce leakage power dissipation in memory cells.If we want to reduce the overall power in the memory system,we have to work on the input circuitry of memory architecture i.e.row and column decoder.In this research work,low leakage power with a high speed row and column decoder for memory array application is designed and four new techniques are proposed.In this work,the comparison of cluster DECODER,body bias DECODER,source bias DECODER,and source coupling DECODER are designed and analyzed for memory array application.Simulation is performed for the comparative analysis of different DECODER design parameters at 180 nm GPDK technology file using the CADENCE tool.Simulation results show that the proposed source bias DECODER circuit technique decreases the leakage current by 99.92% and static energy by 99.92% at a supply voltage of 1.2 V.The proposed circuit also improves dynamic power dissipation by 5.69%,dynamic PDP/EDP 65.03% and delay 57.25% at 1.2 V supply voltage. 相似文献
87.
Generally, passive perforated tiles are used in a data center and the supplied airflow rate is underprovisioned; thus, the balance of the server air requirement is met by the hot air in the room, resulting in higher server inlet temperatures. Full provisioning of the supplied airflow rate and containing the cold aisle is expected to minimize the hot air leakage in the cold aisle, resulting in uniform and lower server inlet temperatures. Thus, the supply air temperature can be raised, resulting in energy savings at the chiller plant. Supplying extra air can be achieved using active perforated tiles, having multiple fans installed on them. In this paper, the underprovisioned case using passive tiles and the fully provisioned case using active tiles are investigated for both open and contained aisle conditions. Thermal field measurements suggest lower and uniform server inlet temperatures for the case with contained aisle as compared to open aisle and for the fully provisioned case using active tiles as compared to the underprovisioned case using passive tiles. System-level energy calculations suggests that containing the cold aisle results in lower (improved) power usage effectiveness (PUE); however, use of active tiles does not seem to improve the PUE. 相似文献
88.
89.
Aishee Dey Suman Gare Sarpras Swain Proma Bhattacharya Vaibhav Dhyani Lopamudra Giri Sudarsan Neogi 《American Institute of Chemical Engineers》2022,68(9):e17801
Investigations on nanomedicine involve conventional two dimensional (2D) imaging techniques for observing the nanoparticle internalization at a single time point where various phases of internalization can be overlooked. In contrast, three dimensional (3D) imaging of fluorescent nanoparticles with anticancer potential can be used for obtaining the time course of cellular retention of particles, and cells can be followed for days. This article demonstrates the application of laser scanning confocal microscopy to quantify poly-l -lysine coated fluorescent ZnO nanoparticle retention and reactive oxygen species (ROS) generation using volumetric imaging. Synthesis of these particles allows monitoring of ROS formation, internalization, and cytotoxicity using the same imaging platform that offers an advantage over measurement using various instruments. PLL-coated ZnO particles' ability to induce a significant reduction in cell-viability suggests its potential as a therapeutic agent. The proposed framework opens up a new avenue for investigating mechanistic aspects of ZnO adsorption and the evaluation of therapeutic efficiency. 相似文献
90.
Hotchandani Vaibhav Mathew Bobby Yesudasan Sumith Chacko Sibi 《Microsystem Technologies》2021,27(1):145-157
Microsystem Technologies - This article details the analysis of the thermo-hydraulic performance of a single-phase MEMS Heat sink with pin fins integrated in micro channels. Circular pin-fins with... 相似文献