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排序方式: 共有390条查询结果,搜索用时 11 毫秒
101.
Ali Qajar Maryam Peer Ramakrishnan Rajagopalan Henry C. Foley 《International Journal of Hydrogen Energy》2012
In the present work, design and operation of a high pressure gas adsorption apparatus at room temperature and at pressures up to 100 bar are discussed. A theoretical and experimental error analysis is done to determine accuracy and robustness of the measurements. For this study, activated carbon was selected as the adsorbent and hydrogen as the adsorbate gas. A sensitivity analysis was done by taking into account the effects of temperature, pressure, volume and weight of the sample. The analysis shows that the volumes of the sample and reference cells as determined by helium-free space measurements have significant effect on the accuracy of the adsorption uptake measurement. For instance, a 0.1% error in the measurement of either volume led to approximately a 3% error in hydrogen uptake measurement at 298 K and 100 bar. 相似文献
102.
Hotel buildings are reported in many countries as one of the most energy intensive building sectors. Besides the pressure posed on energy supply, they also have adverse impact on the environment through greenhouse gas emissions, wastewater discharge and so on. This study was intended to shed some light on the energy and environment related issues in hotel industry. Energy consumption data and relevant information collected from hotels were subjected to rigorous statistical analysis. A regression-based benchmarking model was established, which takes into account, the difference in functional and operational features when hotels are compared with regard to their energy performance. In addition, CO2 emissions from the surveyed hotels were estimated based on a standard procedure for corporate GHG emission accounting. It was found that a hotel’s carbon intensity ranking is rather sensitive to the normalizing denominator chosen. Therefore, carbon intensity estimated for the hotels must not be interpreted arbitrarily, and industry specific normalizing denominator should be sought in future studies. 相似文献
103.
N. Rajagopalan S. Srikantan L. K. Srinivasan G. N. Kannan A. Selvakesavan 《JOM Journal of the Minerals, Metals and Materials Society》2000,52(3):18-19
About 80% of all magnesium is produced by an electrolytic process. The electrolytic route is an energy-intensive process,
and many of the developed countries have realized the need to produce magnesium in a more cost-effective manner. Toward this
goal, a less energy-intensive, more compact electrolytic cell has been developed at the Central Electrochemical Research Institute,
India. A 2,200 A cell was operated for more than six weeks to study the feasibility of the technology. Higher current and
energy efficiencies were realized, and specific energy consumption was reduced to around 11.5 kWh/kg of metal.
For more information, contact N. Rajagopalan, Central Electrochemical Research Institute, Karaikudi 630 006, India; telephone
91-22368; fax 91-04565-37779; e-mail epm@cscercri.ren.nic.in. 相似文献
104.
105.
Sathish Natarajan Rajagopalan Srinivasan 《Chemical Engineering Research and Design》2010,88(5-6):572-591
Offshore oil and gas production platforms are uniquely hazardous in which the operating personnel have to work in a perilous environment surrounded by extremely flammable hydrocarbons. A failure in an equipment could quickly propagate to others resulting in leaks, fires and explosions, causing loss of life, capital invested and production downtime. A method for preventing such accidents is to deploy intelligent monitoring tools which continuously supervise the process and the health of equipments to provide context-specific decision support to operators during safety-critical situations. Such an intelligent system, which is condition driven is developed and described in this paper. Since relevant process data is unavailable in the literature, a dynamic model of an offshore oil and gas production platform was developed using gPROMS and data to reflect operating conditions under normal, fault conditions and maintenance activities were simulated. The different maintenance activities and normal conditions are explicitly considered as separate states of the process. The simulated data are then used to train principal component analysis monitoring models for each of these states. Online fault detection and identification are performed by identifying the operating state in real-time and triggering the respective model. In this paper, the dynamic model and the condition monitoring system are described. 相似文献
106.
Process safety in chemical industries is considered to be one of the important goals towards sustainable development. This is due to the fact that, major accidents still occur and continue to exert significant reputational and financial impacts on process industries. Alarm systems constitute an indispensable component of automation as they draw the attention of process operators to any abnormal condition in the plant. Therefore, if deployed properly, alarm systems can play a critical role in helping plant operators ensure process safety and profitability. However, in practice, many process plants suffer from poor alarm system configuration which leads to nuisance alarms and alarm floods that compromise safety. A vast amount of research has primarily focused on developing sophisticated alarm management algorithms to address specific issues. In this article, we provide a simple, practical, systematic approach that can be applied by plant engineers(i.e., non-experts) to improve industrial alarm system performance. The proposed approach is demonstrated using an industrial power plant case study. 相似文献
107.
Jayaraj Premkumar Dr. Parthasarathy Sampath Dr. Rajagopalan Sanjay Dr. Aluganti Chandrakala Dr. Desikan Rajagopal 《ChemMedChem》2020,15(13):1187-1199
Myeloperoxidase (MPO) is known to cause oxidative stress and inflammation leading to cardiovascular disease (CVD) complications. MPO-mediated oxidation of lipoproteins leads to dysfunctional entities altering the landscape of lipoprotein functionality. The specificity of guaiacol derivatives toward preventing MPO-mediated oxidation to limit MPO's harmful effects is unknown. Diligent in silico studies were accomplished for a portfolio of compounds with guaiacol as a building block. The compounds’ activity toward MPO inhibition was also validated. The role of these chemical entities in controlling MPO-mediated oxidation of lipoproteins (LDL and HDL) was shown to agree with our approach of developing powerful MPO inhibitors. The mechanism of MPO inhibition was demonstrated to be reversible in nature. This study reveals that there is great potential for guaiacol derivatives as therapeutics for CVD by modulating lipid profiles, reducing atherosclerotic plaque burden, and subsequently optimizing cardiovascular functions. 相似文献
108.
Chandunika R.K. Vijayaraghavan Rajagopalan Niroj Kumar Sahu 《IET nanobiotechnology / IET》2020,14(9):823
Preparation of manganese ferrite (MnFe2 O4) nanorods by the reduction of akaganeite seeds in the presence of oleylamine is reported. The Mn‐doped β‐FeOOH akaganeite seeds have been processed by the hydrolysis of metal‐chloride salts in the presence of polyethylenimine (PEI) surfactant. The hydrophobic oleylamine capped nanorods are made hydrophilic using trisodium citrate as a phase transferring agent. The nanorods form with an aspect ratio of 5.47 and possess a high magnetisation value of 69 emu/g at an applied magnetic field of 1.5 T. The colloidal water dispersion of nanorods exhibits superior heating efficiency by the application of alternating magnetic field (AMF). A specific absorption rate value of 798 W/g is achieved at an applied AMF of field strength 500 Oe and frequency 316 kHz. Further, the citrate functionalised nanorods are capable of attaching with doxorubicin (DOX) electrostatically with a loading efficiency of 97% and the drug release is pH responsive. The DOX loaded nanorods show a promising effect on the apoptosis of MCF‐7 as experimented in vitro.Inspec keywords: manganese, hydrophobicity, drug delivery systems, cellular biophysics, magnetic particles, ferrites, manganese compounds, colloids, hyperthermia, pH, iron compounds, biomedical materials, cancer, nanofabrication, nanomagnetics, hydrophilicity, nanoparticles, magnetisation, nanorods, nanomedicineOther keywords: enhanced drug delivery, hyperthermia application, manganese ferrite nanorods, polyethylenimine surfactant, hydrophilic using trisodium citrate, phase transferring agent, high magnetisation, applied magnetic field, heating efficiency, absorption rate, hydrophobic oleylamine capped nanorods, reduction, akaganeite seeds, hydrolysis, trisodium citrate, hydrophilicity, colloidal water dispersion, alternating magnetic field, frequency 316.0 kHz, FeOOH:Mg, MnFe2 O4 相似文献
109.
Adherent and smooth amorphous GeBiSe films deposited by vacuum evaporation at substrate temperatures less than 30 °C have been studied for their structural and optical properties. The films were crystallized by thermal annealing and they were found to be polycrystalline in nature. A correlation between X-ray diffraction (XRD) data and surface topography is reported. Optical constants calculated from reflectance and transmittance data indicate semiconducting behaviour. The optical band gap of the as-deposited film is 1.0 eV. The measured optical contrast at 0.8 m is 44%. No significant changes in the optical parameters have been observed after exposing the samples to laboratory ambient for a period of six months. © 1998 Chapman & Hall 相似文献
110.
Traditional depth estimation methods typically exploit the effect of either the variations in internal parameters such as aperture and focus (as in depth from defocus), or variations in extrinsic parameters such as position and orientation of the camera (as in stereo). When operating off-the-shelf
(OTS) cameras in a general setting, these parameters influence the depth of field (DOF) and field of view (FOV). While DOF
mandates one to deal with defocus blur, a larger FOV necessitates camera motion during image acquisition. As a result, for
unfettered operation of an OTS camera, it becomes inevitable to account for pixel motion as well as optical defocus blur in
the captured images. We propose a depth estimation framework using calibrated images captured under general camera motion
and lens parameter variations. Our formulation seeks to generalize the constrained areas of stereo and shape from defocus (SFD)/focus
(SFF) by handling, in tandem, various effects such as focus variation, zoom, parallax and stereo occlusions, all under one
roof. One of the associated challenges in such an unrestrained scenario is the problem of removing user-defined foreground
occluders in the reference depth map and image (termed inpainting of depth and image). Inpainting is achieved by exploiting
the cue from motion parallax to discover (in other images) the correspondence/color information missing in the reference image. Moreover, considering the fact that
the observations could be differently blurred, it is important to ensure that the degree of defocus in the missing regions
(in the reference image) is coherent with the local neighbours (defocus inpainting). 相似文献