全文获取类型
收费全文 | 58篇 |
免费 | 4篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 21篇 |
金属工艺 | 2篇 |
建筑科学 | 1篇 |
能源动力 | 1篇 |
轻工业 | 5篇 |
水利工程 | 1篇 |
无线电 | 6篇 |
一般工业技术 | 19篇 |
冶金工业 | 3篇 |
原子能技术 | 1篇 |
自动化技术 | 2篇 |
出版年
2022年 | 4篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 5篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 2篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 3篇 |
2007年 | 2篇 |
2006年 | 3篇 |
2005年 | 1篇 |
2003年 | 1篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有64条查询结果,搜索用时 15 毫秒
1.
Devi Neena Patel Sanjay K. S. Kumar Pradeep Singh Archana Thakur Nandita Lata Jeevan Pandey Deepak Thakur Vikram Chand Duni 《Catalysis Letters》2022,152(4):944-953
Catalysis Letters - In this study, Rhodococcus pyridinivorans cells containing hyperactive acyltransferase was immobilized on various macromolecules based-polymeric matrices and used to improve... 相似文献
2.
Uher Richard A. Sathi Neena Sathi Arvind 《Industry Applications, IEEE Transactions on》1984,(3):472-483
An energy cost reduction study was conducted on the Washington Metropolitan Area Transit Authority Metrorail system. Its primary objectives were to classify primary energy end uses and identify conservation methods which have the highest potential for reducing the electric bill. The effort involved analyzing present energy costs, developing cost- effective conservation strategies, determining the savings associated with the strategies by simulation, recommending appropriate strategies for implementation and outlining a program for executing the recommendations. Although the effort involved both traction and support energy, only the traction energy aspects of the study are reported. It is the first time that the energy management model developed for the transit industry by the Rail Systems Center at Carnegie-Mellon University was comprehensively applied to a rapid transit property. The application was verified by comparing the simulated results to actual data. For anl practical purposes, the simulated results agree to within three percent of the actual energy consumption. Four traction energy conservation strategies were recommended for implementation based on high benefit and low cost. These are coasting, passenger load factor improvement, planned catch-up operation, and regeneration of braking energy. All of these strategies have payback periods of less than three years. 相似文献
3.
4.
Neena D. K. B. Garg P. A. Alvi D. Kumar Kavita S. Jerath M. Abu-Samak S. Dalela 《Journal of Superconductivity and Novel Magnetism》2014,27(9):1967-1972
This paper reports on the band structure properties and changes in band structure of fluorine-doped LaO1?x F x FeAs (x = 0, 0.2) compound, measured using X-ray photoemission spectroscopy (XPS). The band structure of the superconducting compound is compared with nonsuperconducting parent compound LaOFeAs. With fluorine doping, a shift of the shallow core level is observed in XPS spectra, which may be a response of the band structure due to fluorine doping in the system. The balance of the chemical potential shift with the screening effect of conduction electrons near the Fe and As ions is discussed using nearly unchanged Fe 2p and As 3d core-level spectra. The La 3d core-level spectra shift towards the high energy, ~0.36 eV, may be due to the chemical potential shift caused by fluorine doping. In our valence band spectra, a small peak at around 0.2 eV is observed, which disappeared with the fluorine doping in the system, indicating a change of Fe 3d state from low spin to high spin states and also confirming the nature of Fe 3d electrons as itinerant, which is responsible for superconductivity in these compounds. 相似文献
5.
Jun Zhang Surajit Karmakar Meihua Yu Neena Mitter Jin Zou Chengzhong Yu 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(24):5068-5076
A rationally designed two‐step synthesis of silica vesicles is developed with the formation of vesicular structure in the first step and fine control over the entrance size by tuning the temperature in the second step. The silica vesicles have a uniform size of ≈50 nm with excellent cellular uptake performance. When the entrance size is equal to the wall thickness, silica vesicles after hydrophobic modification show the highest loading amount (563 mg/g) towards Ribonuclease A with a sustained release behavior. Consequently, the silica vesicles are excellent nano‐carriers for cellular delivery applications of therapeutical biomolecules. 相似文献
6.
In this article, we report on the biodegradation of soy‐protein‐grafted polyethylene, which was successfully synthesized by a graft copolymerization method with benzoyl peroxide as the radical initiator. The biodegradation behavior of the grafted polyethylene was ascertained by a soil burial test. The weight‐loss percentage was measured as a function of the number of days, and it was observed that the percentage weight loss increased with increasing number of days. To further substantiate the degradation, microanalysis of the soil containing the samples was carried out. An increase in microorganism colonies was observed with increasing number of days. The hydrolysis of the samples taken from the soil after a specified number of days also corroborated the findings and revealed a continuous loss of weight. The effect of the degradation of the grafted samples on the growth of plants (wheat and soybean) was studied, and we observed that the products of degradation were not harmful to the growth of the plants. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
7.
Effect of polymer composition on performance properties of maleate-vinyl ether donor-acceptor UV-curable systems 总被引:1,自引:0,他引:1
Neena Ravindran Ankit Vora Dean C. Webster 《Journal of Coatings Technology and Research》2006,3(3):213-219
The effect of unsaturated polyester backbone composition on the properties of donor-acceptor-UV-cured coatings was explored. The polyesters were designed with similar molecular weights and levels of unsaturation, but with otherwise widely varying backbone compositions. UV-curable coatings were formulated with stoichiometric levels of triethylenglycol divinyl ether and a photoinitiator. The resulting coatings had a broad range of properties, which were found to correlate with the properties and compositions of the polyester backbone polymers. A relatively flexible backbone resulted in lower glass transition temperatures (Tg). The polymer Tg was found to influence the conversion of double bonds achieved during UV curing. Reaction kinetics were evaluated for the coating systems and the results confirmed that the Tg of the systems influenced the double bond conversion. Thermal stability and König pendulum hardness were also found to vary with the backbone composition of the constituent polyester. 相似文献
8.
Engineering Iron Oxide Hollow Nanospheres to Enhance Antimicrobial Property: Understanding the Cytotoxic Origin in Organic Rich Environment 下载免费PDF全文
Yusilawati Ahmad Nor Liang Zhou Anand Kumar Meka Chun Xu Yuting Niu Hongwei Zhang Neena Mitter Donna Mahony Chengzhong Yu 《Advanced functional materials》2016,26(30):5408-5418
Engineered magnetic iron oxide nanoparticles with surprisingly high antimicrobial activity and excellent safety profiles to mammalian cell lines have been developed. Hematite hollow nanospheres (HNSs) are prepared by a facile hard templating method; reduction of hematite HNSs by H2 leads to magnetite HNSs. The antimicrobial activity of magnetite HNSs towards Gram negative (Escherichia coli) and Gram positive (Staphylococcus epidermidis) bacteria is evaluated against hematite HNSs and conventional magnetite (C‐magnetite; diameter <50 nm). Superior antibacterial performance is observed for magnetite HNSs towards both E. coli and S. epidermidis over hematite HNSs and C‐magnetite. The origin of the antimicrobial activity of magnetite HNSs is the high leaching of iron ions in the presence of microorganisms, which leads to high generation of reactive oxygen species. Magnetite HNSs allow multiple‐fold increase in the generation of soluble iron ions over hematite HNSs and C‐magnetite, showing that control over both the composition and nanostructure is crucial to tune the antimicrobial activity of iron oxides. Based on the current findings, magnetic HNSs show promising potential antimicrobial applications. 相似文献
9.
The SiO_2-Fe_3O_4 core-shell nanostructures were synthesized by sol-gel chemistry.The morphological features of the nanostructures were examined by field emission scanning electron microscopy which revealed the core-shell nature of the nanoparticles.X-ray diffraction studies evidenced the formation of SiO_2-Fe_3O_4 core-shell nanostructures with high degree of homogeneity.The elemental composition of the SiO_2-Fe_3O_4 core-shell nanostructures was determined by energy-dispersive X-ray spectroscopy analysis.Fourier transform infrared spectroscopy showed the Si-O-Fe stretching vibrations.On analysis of the optical properties with UV-Vis spectra and Tauc's plot,it was found that the band gap of SiO_2-Fe_3O_4 core-shell nanostructures diminished to 1.5 eV.Investigation of the electrical properties of the core-shell nanostructures using field-dependent conductivity measurements presented a significant increase in photoconductivity as compared to those of its single components,thereby rendering them as promising candidates for application as photoelectrodes in dye-sensitized solar cells. 相似文献
10.
Reactivity of medium-chain substrates in the interesterification of tripalmitin catalyzed by papaya lipase 总被引:2,自引:1,他引:1
Neena N. Gandhi Kumar D. Mukherjee 《Journal of the American Oil Chemists' Society》2001,78(9):965-968
Reactivity of different medium-chain substrates, i.e., n-octanol, caprylic acid, and its alkyl (methyl, ethyl, n-propyl, and n-butyl) esters, was assessed in the interesterification of tripalmitin catalyzed by papaya (Carica papaya) lipase. Alcoholysis with n-octanol was the fastest reaction leading to the highest conversion of tripalmitin to n-octyl palmitate and concomitant formation of di- as well as monopalmitoylglycerols. This was followed by transesterification
of tripalmitin with n-butyl and n-propyl caprylates, which in turn were faster than transesterification with ethyl and methyl caprylates, yielding in each
case the corresponding alkyl palmitates and triacylglycerols containing palmitoyl and capryloyl moieties as the major reaction
products. Acidolysis of tripalmitin with caprylic acid yielded palmitic acid and triacylglycerols containing palmitoyl and
capryloyl moieties as the major reaction products, however, with the lowest conversion among the three interesterification
reactions studied. In each case, interesterification was accompanied by some hydrolysis of tripalmitin. 相似文献