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Lazarus EA Navratil GA Greenfield CM Strait EJ Austin ME Burrell KH Casper TA Baker DR DeBoo JC Doyle EJ Durst R Ferron JR Forest CB Gohil P Groebner RJ Heidbrink WW Hong R Houlberg WA Howald AW Hsieh C Hyatt AW Jackson GL Kim J Lao LL Lasnier CJ Leonard AW Lohr J La Haye RJ Maingi R Miller RL Murakami M Osborne TH Perkins LJ Petty CC Rettig CL Rhodes TL Rice BW Sabbagh SA Schissel DP Scoville JT Snider RT Staebler GM Stallard BW Stambaugh RD St John HE Stockdale RE Taylor PL Thomas DM 《Physical review letters》1996,77(13):2714-2717
3.
Vaghela SS Jethva AD Gohil MS Subbarayappa A Gour PM Susarla VS Gadde R Ghosh PK 《Annali di chimica》2003,93(9-10):841-848
A textile dye effluent containing chiefly reactive azo dyes has been treated electrochemically for discoloration and COD (chemical oxygen demand) reduction at different current densities, flow rates and dilution. Experiments have been carried out in a thin electrochemical reactor under single pass conditions using a dimensionally stable catalytic anode (DSA) and a stainless steel cathode. 相似文献
4.
Polypyrrole composite cation- and anion-exchange membranes (CEM and AEM), in which polypyrrole (PPY) coated on one surface of the membrane as a thin layer, were prepared by chemical polymerization of pyrrole in the presence of high oxidant concentration (Na2S2O8). Existence of polypyrrole layer on the both types of ion-exchange membranes were confirmed by recording their coating density, SEM images and conductivity. These membranes were extensively characterized by recording their properties such as water uptake, ion-exchange capacity, contact angle, permselectivity and membrane conductivity as a function of polymerization time such as. It was observed that due to coating of PPY for 2 h, membrane permselectivity of CEM for NaCl (0.907) was reduced to 0.873, while it was increased from 0.747 to 0.889 in the case of AEM. Similar behaviors were also obtained for bi-valent electrolytes. Electrodialysis experiments were also conducted with polypyrrole composite ion-exchange membranes using mixed electrolytic systems. Relative dialytic rates for NaCl with respect to other bi-valent electrolyte were varied in between 5 and 8 (depending on bi-valent electrolyte), which suggested the feasible and efficient separation of mono-valent from bi-valent electrolyte. Slower electro-migration of bi-valent electrolyte (CaCl2, MgCl2 and CuCl2) in comparison to NaCl was explained on the basis of synergetic effect of sieving of bulkier bi-valent cations by tight and rigid polypyrrole layer and the difference in electrostatic and hydrophobic–hydrophilic repulsion force between bi-valent cations and mono-valent cation. It was concluded that these composite membranes are suitable for the efficient separation of same type of charged ions by electro-driven separation techniques. 相似文献
5.
Sulfonated poly(ether ether ketone) (PEEK) was prepared by sulfonation of commercial Victrex@ PEEK and degree of sulfonation was found to be about 44.5% by 1H NMR. Sulfonated PEEK/polyaniline composite membranes, in order to prevent methanol crossover, were prepared by chemical polymerization of a thin layer of polyaniline (PANI) in the presence of a high oxidant concentration on a single face modification. FTIR and PANI coating density studies confirmed the loading of PANI in sulfonated PEEK membrane matrix. PANI composite membranes with different polymerization time were prepared and subjected to thermogravimetric analysis as well as electrochemical and methanol permeability study to compare with sulfonated PEEK and Nafion 117 membrane. Ion-exchange capacity, water uptake, proton transport numbers and proton conductivities for different PANI composite sulfonated PEEK (SPEEK) membranes were found to be dependent on the coating density of the PANI in the membrane matrix and were slightly lower than that of Nafion 117 membrane. Methanol permeability of these membranes (especially SPEEK/PANI-1.5) was about four times lower than Nafion 117 membrane. Among the all SPEEK membranes synthesized in this study, SPEEK-1.5 appears to be more suitable for direct methanol fuel cell (DMFC) application considering optimum physicochemical and electrochemical properties, thermal stability as well as very low methanol permeability. Above all, the cost-effective and simple fabrication technique involved in the synthesis of such composite membranes makes their applicability quite attractive. 相似文献
6.
The phase transformation from the tetragonal to the hexagonal crystal modification in highly oriented lamellae of poly-butene-1 has been followed by transmission electron microscopy (TEM). It is found that the reaction-controlling step is the nucleation process. No lattice orientation relationship (besides the [001]-direction, which is parallel in both crystal modifications) exists between non-transformed and transformed crystals. The nucleation is strongly enhanced by thermal or external stresses. Crystal growth, nucleated by external stresses, was observed at temperatures as low as — 150°C. The molecular mechanisms of the transformation are discussed. 相似文献
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Trushar Gohil Robert H. P. McGregor Dominik Szczerba Kathrin Burckhardt Krishnamurthy Muralidhar Gábor Székely 《国际流体数值方法杂志》2011,66(8):1037-1067
Cardiovascular diseases are one of the major causes of long‐term morbidity and mortality in human beings. The nearly epidemic increase in prevalence of such diseases poses a serious threat to public health and calls for efficient methods of diagnosis and treatment. Non‐invasive diagnostic procedures such as MRI are often used in this context; however, these are limited in terms of spatial and temporal resolution and do not provide information on time‐dependent pressures and wall shear stresses—key quantities considered to be partially responsible for the formation and development of related pathologies. The present study is concerned with the numerical simulation of oscillatory flow through the abdominal aortic bifurcation. Computational fluid dynamics simulation of oscillatory flow in a branched geometry at high Reynolds numbers poses considerable challenges. The present study reports a detailed comparison of simulations performed with a finite volume and a finite element method, two approaches with significant differences in their discretization strategy, treatment of boundary conditions and other numerical aspects. Both solvers were parallelized, using loop parallelization of the BiCGStab linear solver for the finite volume and domain decomposition based on the Schur complement method for the finite element technique. The experience gained with these two approaches for the solution of flow in a bifurcation forms the focus of this study. Although similar results were obtained for both methods, the computation time required for convergence was found to be significantly smaller for the finite element approach. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
9.
Malbari Khushboo D. Chintakrindi Anand S. Ganji Lata R. Gohil Devanshi J. Kothari Sweta T. Joshi Mamata V. Kanyalkar Meena A. 《Molecular diversity》2019,23(4):927-951
Molecular Diversity - The rate of mutability of pathogenic H1N1 influenza virus is a threat. The emergence of drug resistance to the current competitive inhibitors of neuraminidase, such as... 相似文献
10.
Bhaskar. M. Murari Sneh. Anand Nivedita. K. Gohil Nabo. K. Chaudhury 《Journal of Sol-Gel Science and Technology》2007,41(2):147-155
The characterization of physicochemical properties of the internal environment of sol-gel thin films is required for understanding
and designing applications in optical biosensors. We have investigated the dip coated tetraethyl-orthosilicate (TEOS) derived
sol-gel thin films deposited on microscopic glass cover slips using molar ratio (water or ethanol / TEOS) R=32 using fluorescence spectroscopic measurements (emission, lifetime and anisotropy) on entrapped fluorescent probes. The
effect of water and/or ethanol was studied as a function of storage (60 days) using fluorescent probes Hoechst 33258 (H258)
and Pyranine (PY). Distribution of fluorescent probes in thin film was studied using confocal microscope. Emission maxima
of H258 entrapped thin films from sol prepared using water as solvent showed emission maximum at 503 nm indicating the presence
of water like environment which did not change during storage. On the contrary, PY entrapped thin films depicted emission
bands at 434 nm and 513 nm, characteristics of ethanol and water respectively, up to the first few weeks and then the band
at 434 nm prevailed (60 days), suggesting heterogeneous internal environment. Thin films from sol prepared using ethanol as
solvent showed presence of ethanol through out storage. Fluorescence lifetime data of these probes in both sol-gel and thin
films also suggested presence of heterogeneous internal environment. Thin films prepared from sol-gel using water as solvent
suggested release of ethanol in the pores during hydrolysis and condensation reaction, which were clearly indicated by PY.
The effect of sodium phosphate buffer was also studied in sol-gel and thin films. The results of these measurements showed
that both the probes H258 and PY could be used effectively in monitoring the physicochemical properties of internal environment
of thin films and sol-gel as a function of storage. 相似文献