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排序方式: 共有250条查询结果,搜索用时 31 毫秒
241.
Jag M. Nagpal Bachan S. Rawat 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1981,31(1):146-150
The liquid-liquid equilibria for toluene-n-heptane-N-methyl pyrrolidone containing 10 and 20% water at 298 and 313 K, and of benzene-n-heptane with N-methyl pyrrolidone-ethylene glycol and γ-butyrolactone-ethylene glycol, which is a new solvent combination, have been determined at 303 K. 相似文献
242.
Mohan L. Sagu Krishna M. Sharan Janardan Swarup Dayal S. Rawat Kshitindra K. Bhattacharyya 《大分子材料与工程》1977,62(1):45-51
Polymerisation of trioxane in the solid state induced by γ-radiation is mainly affected by three variables: radiation dose, post-polymerisation temperature and its duration. In order to optimise the process parameters and study the effects and interactions of these three variables on the conversion of trioxane to polyacetal investigations were carried out by a series of statistically designed experiments. The relationship between the variables and yield was correlated by a least square fit polynomial equation. Applying this relationship, contours of yields were plotted against the variables in the range of interest. The effects of these process variables and the optimum conditions are discussed. 相似文献
243.
Amar N. Goswami Bachan S. Rawat 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1984,34(4):174-182
The effect of time on the permeation of benzene through aqueous surfactant membranes formed with two non-ionic surfactants has been studied on a batch scale under two different conditions of surfactant concentration and hydrocarbon: water ratio in the emulsions. The data have been correlated by an equation based on Casamatta's model of hydrocarbon permeation from an emulsion drop. The results indicate that the correlation can be used to treat the data until the onset of membrane rupture. The membrane thickness depends on the hydrocarbon: water ratio in the emulsion, and varies from about 1.57 to 5.10 μm. 相似文献
244.
One of the main drivers for intelligent transportation systems is safety. Adaptive cruise control, as a common solution for traffic safety, has extended from radars to cameras. Due to high mobility of vehicles and unevenness of roads, the picture quality of cameras has been great challenges for camera-based adaptive cruise control. In this paper, an image distortion correction algorithm is addressed. Our method is based on optical flow technology which is normally applied in motion estimation and video compression research. We are the first to attempt to adapt it in image distortion correction. Two optical flow approaches, the Lucas-Kanade method and the Horn-Schunck method, are selected and compared. The procedure of image distortion correction using the optical flow method has been tested by both synthetic test images and camera images. The experimental results show that the Lucas-Kanade method is more suitable in the correction of image distortion. 相似文献
245.
In this work, we present a computationally efficient approach for atomistic simulations of graphene nanoribbon (GNR), bilayer graphene (BLG) and bilayer graphene nanoribbon (BLGNR) field-effect transistors. The simulation scheme, which involves the self-consistent solutions of the non-equilibrium Green function method (NEGF) and 2-D Poisson’s equation, is based on the tight binding Hamiltonian in a 1-D real-space basis. We show that the Hamiltonian matrix for smooth edge GNRs and graphene can be expressed by 1 \(\times \) 1 size coupling matrices, which provides easy solutions for NEGF equations and largely reduces the computational time for simulation. The BLG and BLGNR can be described by the two coupled single-layer GNR Hamiltonian matrices, which allows the modeling of these devices by the same transport equations as GNR-FET with small modifications. Furthermore, the developed transport models are verified with the previously reported simulation and theoretical results. 相似文献
246.
247.
Vibration analysis of a thin circular cylindrical shell with closure is conducted using finite element method (FEM). Theoretically, shell vibrates in different axial modes, m; circumferential modes, n; and any of their combinations with corresponding modal frequencies. The present FEM results are verified by the results reported in the literature using various shell theories. The eigenvalues of the shell are extracted using block Lanczos and subspace iteration methods, in order to investigate their computational efficacy. Further, the effect of adding various types of closures at one end of the circular cylindrical shell such as flat, cone, and dome, on the modal frequencies are investigated. The two aspect ratios (length to radius ratio) of shell with closure, broad, and slender are considered for this study. The effect of the ratio of the thickness of the closure to the thickness of shell wall on the frequency is also investigated. For the shell with the closure, the vibration modes can be cylinder, closure, or combined cylinder and closure. The modal frequency of the cylindrical shell is significantly affected by the closure. The lowest frequency is observed in the flat type of closure in both the broad and slender cylindrical shells in comparison to the non-closure, dome, and cone type of the closures. 相似文献
248.
249.
Priyanka Rawat Ujala Sehar Jasbir Bisht Ashley Selman John Culberson P. Hemachandra Reddy 《International journal of molecular sciences》2022,23(21)
Alzheimer’s disease (AD) is the leading cause of dementia in elderly people. Amyloid beta (Aβ) deposits and neurofibrillary tangles are the major pathological features in an Alzheimer’s brain. These proteins are highly expressed in nerve cells and found in most tissues. Tau primarily provides stabilization to microtubules in the part of axons and dendrites. However, tau in a pathological state becomes hyperphosphorylated, causing tau dysfunction and leading to synaptic impairment and degeneration of neurons. This article presents a summary of the role of tau, phosphorylated tau (p-tau) in AD, and other tauopathies. Tauopathies, including Pick’s disease, frontotemporal dementia, corticobasal degeneration, Alzheimer’s disease, argyrophilic grain disease, progressive supranuclear palsy, and Huntington’s disease, are the result of misprocessing and accumulation of tau within the neuronal and glial cells. This article also focuses on current research on the post-translational modifications and genetics of tau, tau pathology, the role of tau in tauopathies and the development of new drugs targeting p-tau, and the therapeutics for treating and possibly preventing tauopathies. 相似文献
250.
Yaam Deckel Lauren A. Lowe Siddharth Rawat Matthew Turner James Luong Dr. Anna Wang 《Chembiochem : a European journal of chemical biology》2023,24(10):e202300069
The hydrodynamic effects of macromolecular crowding inside cells are often studied in vitro by using polymers as crowding agents. Confinement of polymers inside cell-sized droplets has been shown to affect the diffusion of small molecules. Here we develop a method, based on digital holographic microscopy, to measure the diffusion of polystyrene microspheres that are confined within lipid vesicles containing a high concentration of solute. We apply the method to three solutes of varying complexity: sucrose, dextran, and PEG, prepared at ∼7 % (w/w). We find that diffusion inside and outside the vesicles is the same when the solute is sucrose or dextran that is prepared below the critical overlap concentration. For poly(ethylene glycol), which is present at a concentration higher than the critical overlap concentration, the diffusion of microspheres inside vesicles is slower, hinting at the potential effects of confinement on crowding agents. 相似文献