全文获取类型
收费全文 | 702篇 |
免费 | 29篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 7篇 |
化学工业 | 219篇 |
金属工艺 | 13篇 |
机械仪表 | 13篇 |
建筑科学 | 9篇 |
能源动力 | 30篇 |
轻工业 | 86篇 |
水利工程 | 3篇 |
无线电 | 91篇 |
一般工业技术 | 114篇 |
冶金工业 | 75篇 |
原子能技术 | 8篇 |
自动化技术 | 64篇 |
出版年
2024年 | 2篇 |
2023年 | 8篇 |
2022年 | 32篇 |
2021年 | 30篇 |
2020年 | 28篇 |
2019年 | 23篇 |
2018年 | 48篇 |
2017年 | 33篇 |
2016年 | 26篇 |
2015年 | 12篇 |
2014年 | 30篇 |
2013年 | 70篇 |
2012年 | 26篇 |
2011年 | 36篇 |
2010年 | 35篇 |
2009年 | 30篇 |
2008年 | 33篇 |
2007年 | 21篇 |
2006年 | 23篇 |
2005年 | 12篇 |
2004年 | 13篇 |
2003年 | 11篇 |
2002年 | 12篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 8篇 |
1998年 | 26篇 |
1997年 | 24篇 |
1996年 | 11篇 |
1995年 | 10篇 |
1994年 | 3篇 |
1993年 | 8篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有732条查询结果,搜索用时 15 毫秒
1.
Indranil Roy Manish Chauhan Farghalli A. Mohamed Enrique J. Lavernia 《Metallurgical and Materials Transactions A》2006,37(3):721-730
Thermal stability in bulk ultrafine-grained (UFG) 5083 Al that was processed by gas atomization followed by cryomilling, consolidation,
and extrusion, and that exhibited an average grain size of 305 nm, was investigated in the temperature range of 473 to 673
K (0.55 to 0.79 T
m
, where T
m
is the melting temperature of the material) for different annealing times. Appreciable grain growth was observed at temperatures
> 573 K, whereas there was limited grain growth at temperatures < 573 K even after long annealing times. The values of the
grain growth exponent, n, deduced from the grain growth data were higher than the value of 2 predicted from elementary grain growth theories. The
discrepancy was attributed to the operation of strong pinning forces on boundaries during the annealing treatment. An examination
of the microstructure of the alloy suggests that the origin of the pinning forces is most likely related to the presence of
dispersion particles, which are mostly introduced during cryomilling. Two-grain growth regimes were identified: the low-temperature
region (<573 K) and the high-temperature region (>573 K). For temperatures lower than 573 K, the activation energy of 25 ±
5 kJ/mol was determined. It is suggested that this low activation energy represents the energy for the reordering of grain
boundaries in the UFG material. For temperatures higher than 573 K, an activation energy of 124 ± 5 kJ/mol was measured. This
value of activation energy, 124 ± 5 kJ/mol, lies between that for grain boundary diffusion and lattice diffusion in analogous
aluminum polycrystalline systems. The results show that the strength and ductility of bulk UFG 5083 Al, as obtained from tensile
tests, correlate well with substructural changes introduced in the alloy by the annealing treatment. 相似文献
2.
3.
K. N. Mehrotra M. Chauhan R. K. Shukla 《Journal of the American Oil Chemists' Society》1996,73(7):897-902
The ultrasonic velocity and density measurements of europium soaps in a mixture of benzene and methanol (3:2, vol/vol) were
used to evaluate various acoustic parameters and molar volume and to determine the critical micelle concentration. The results
showed that the ultrasonic velocity, specific acoustic impedance, molar sound velocity, and molar compressibility increase,
and intermolecular free length, adiabatic Compressibility, and relative association decrease with increasing concentration
and chainlength of the soap. The results were interpreted in terms of soap-solvent interaction. 相似文献
4.
Mahajan Nitish Chauhan Amita Kumar Harish Kaushal Sakshi Sangaiah Arun Kumar 《Mobile Networks and Applications》2022,27(4):1423-1443
Mobile Networks and Applications - In the era of Internet of Things (IoT) powered by 5G technologies, Automobile Industry is headed towards a revolution. In Intelligent Transport Systems (ITS),... 相似文献
5.
Lin Pei-Chun Yankson Benjamin Chauhan Vishal Tsukada Manabu 《The Journal of supercomputing》2022,78(13):15060-15088
The Journal of Supercomputing - Currently, many smart speakers, even social robots, appear on the market to help people's lives become more convenient. Usually, people use smart speakers to... 相似文献
6.
Sahebrao B. Kashid Jaya R. Lakkakula Deepak S. Chauhan Rohit Srivastava Rajesh W. Raut 《IET nanobiotechnology / IET》2017,11(8):1046
Cotton fibres coated with biogenically fabricated silver nanoparticles (SNPs) are most sought material because of their enhanced activity and biocompatibility. After successful synthesis of SNPs on cotton fibres using leaf extract of Vitex negundo Linn, the fibres were studied using diffuse reflectance spectroscopy, scanning electron microscopy, nanoparticle tracking analysis, energy dispersive X‐ray, and inductively coupled plasma atomic emission spectrometry. The characterisation revealed uniformly distributed spherical agglomerates of SNPs having individual particle size around 50 nm with the deposition load of 423 μg of silver per gram of cotton. Antimicrobial assay of cotton–SNPs fibres showed effective performance against pathogenic bacteria and fungi. The method is biogenic, environmentally benign, rapid, and cost‐effective, producing highly biocompatible antimicrobial coating required for the healthcare industry.Inspec keywords: cotton, health care, nanoparticles, coatings, silver, fibres, nanofabrication, scanning electron microscopy, X‐ray chemical analysis, atomic emission spectroscopy, plasma applications, microorganisms, biotechnologyOther keywords: biocompatible antimicrobial cotton fibre coating, healthcare industry, bioorganic‐coated silver nanoparticle synthesis, biogenically fabricated silver nanoparticle, SNP, leaf extraction, Vitex negundo Linn, diffuse reflectance spectroscopy, scanning electron microscopy, nanoparticle tracking analysis, energy dispersive X‐ray spectrometry, inductively coupled plasma atomic emission spectrometry, uniformly distributed spherical agglomerate, antimicrobial assay, pathogenic bacteria, fungi, Ag 相似文献
7.
Anjali Awasthi Satyaveer S. Chauhan Hichem Omrani Ariyo Panahi 《Computers & Industrial Engineering》2011,61(3):637-646
Managing service quality is vital to retain customer satisfaction and augment revenues for any business organization. Often it is difficult to assess service quality due to lack of quantifiable measures and limited data. In this paper, we present a hybrid approach based on SERVQUAL and fuzzy TOPSIS for evaluating service quality of urban transportation systems. The proposed approach consists of three steps. The first step involves development of a SERVQUAL based questionnaire to collect data for measuring transportation service quality. The participants provide linguistic assessments to rate the service quality criteria and the alternatives. In step 2, the linguistic ratings are combined through fuzzy TOPSIS to generate an overall performance score for each alternative. The alternative with the highest score is finally chosen. In step 3, sensitivity analysis is conducted to evaluate the influence of criteria weights on the decision making process.The strength of the proposed approach is its practical applicability and ability to provide solution under partial or lack of quantitative information. An application of the proposed approach for evaluation of service quality of metro in Montreal is provided. 相似文献
8.
In this paper, we have developed analytical stochastic communication technique for inter and intra-Networks-on-Chip (NoC)
communication. It not only separates the computation and communication in Networks-in-Package (NiP) but also predicts the
communication performance. Moreover, it will help in tracking of the lost data packets and their exact location during the
communication. Further, the proposed technique helps in building the Closed Donor Controlled Based Compartmental Model, which
helps in building Stochastic Model of NoC and NiP. This model helps in computing the transition probabilities, latency, and
data flow from one IP to other IP in a NoC and among NoCs in NiP. From the simulation results, it is observed that the transient
and steady state response of transition probabilities give state of data flow latencies among the different IPs in NoC and
among the compartments of NoCs in NiP. Furthermore, the proposed technique produces low latency as compared to the latencies
being produced by the existing topologies. 相似文献
9.
Ram Swaroop Verma Rajendra Chandra Padalia Amit Chauhan 《Journal of the science of food and agriculture》2012,92(3):626-631
BACKGROUND: Two Ocimum basilicum cultivars, ‘Vikarsudha’ and ‘CIM‐Saumya’, grown in the Kumaon region of western Himalaya were evaluated for their essential oil yield and composition at different stages of plant growth during two distinct cropping seasons (spring–summer and rain–autumn). RESULTS: The highest yield of essential oil was obtained at full bloom stage in both cultivars in both cropping seasons. The essential oils obtained from different stages in two cropping seasons were analysed by capillary gas chromatography with flame ionisation detection, and gas chromatography–mass spectrometry. The major component of cultivar ‘Vikarsudha’ was methyl chavicol (84.3–94.3%), while for cultivar ‘CIM‐Saumya’ the main components were methyl chavicol (62.5–77.6%) and linalool (14.4–34.1%). CONCLUSION: This study clearly indicated that cultivar, cropping season, plant ontogeny and plant part had significant effects on the yield and quality of the essential oil of O. basilicum. Further, the amount of methyl chavicol in the cultivars grown in this region was higher than in cultivars from other parts of India. Copyright © 2011 Society of Chemical Industry 相似文献
10.