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排序方式: 共有98条查询结果,搜索用时 31 毫秒
1.
Savita Verma Deepak M. Maher Samadhan S. Nagane Bhausaheb V. Tawade Prakash P. Wadgaonkar 《Journal of polymer science. Part A, Polymer chemistry》2019,57(5):588-597
New aromatic (co)polyesters containing pendant propargyloxy groups were synthesized by phase transfer‐catalyzed interfacial polycondensation of 5‐(propargyloxy)isophthaloyl chloride (P‐IPC) and various compositions of P‐IPC and isophthaloyl chloride with bisphenol A. FTIR and NMR spectroscopic data, respectively, revealed successful incorporation of pendant propargyloxy groups into (co)polyesters and formation of (co)polyesters with desired compositions. (Co)polyesters exhibited good solubility in common organic solvents such as chloroform, dichloromethane, and tetrahydrofuran and could be cast into transparent, flexible, and tough films from chloroform solution. Inherent viscosities and number average molecular weights of (co)polyesters were in the range 0.77–1.33 dL/g and 43,600–118,000 g/mol, respectively, indicating the achievement of reasonably high‐molecular weights. The 10% weight loss temperatures of (co)polyesters were in the range 390–420 °C, demonstrating their good thermal stability. (Co)polyesters exhibited Tg in the range 146–170 °C and Tg values decreased with increase in mol % incorporation of P‐IPC. The study of non‐isothermal curing by DSC indicated thermal crosslinking of (co)polyesters via propargyloxy groups. The utility of pendant propargyloxy group was demonstrated by post‐modification of the selected copolyester with 1‐(4‐azidobutyl)pyrene, 9‐(azidomethyl)anthracene, and azido‐terminated poly(ethyleneglycol) monomethyl ether via copper(I)‐catalyzed Huisgen 1,3‐dipolar cycloaddition reaction. FTIR and 1H NMR spectra confirmed that click reaction was quantitative. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019 , 57, 588–597 相似文献
2.
A. Bagheri K. L. Baluja Savita M. Datta 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1994,32(3):211-217
The density (N) dependence of electron mobility (μ) in various dense gases (H2, N2, O2, CO2 and rare gases) has been calculated using a multiple-scattering approach. Deviation of the high density gas from its perfect gas behaviour has been taken into account through the temperature-dependent second virial coefficient. Multiple scattering of electrons leads to shifts in their kinetic energy and it also changes their distribution functions. This unified approach predicts both positive and negative effects. The positive (negative) effect entails on increase (decrease) of μ withN. We have assessed the available data on momentum transfer cross-sections by comparing the mobility at very low densities (Nμ)0 with experimental results. The density dependence is studied by comparing the calculated ratioNμ)/Nμ)0 with the observed values and other theoretical work. The Legler model which assumes a constant cross-section is inadequate for predicting the observed density dependence. We obtain good agreement with available experimental work for all the atomic and molecular species studied here. 相似文献
3.
K. L. Baluja Anju Gupta Savita M. Datta 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1993,28(2):105-108
Configuration interaction wavefunctions, transition energies, line strengths and transition probabilities for allowed transitions within then=2 complex of C-like Fe XXI have been calculated in the LS coupling scheme. We included internal, semi-internal, and all-external types of correlations. We compare our non-relativistic line strengths values with those of relativistic calculations in the Breit-Pauli approximation. The relativistic effects on line strengths are negligible for all transitions except for the transition1 D e →1 D 0. Experimental wavelengths are used in the calculation of transition probabilities. 相似文献
4.
Synthesis,spectroscopic evaluation,molecular modelling,thermal study and biological evaluation of manganese(II) complexes derived from bidentate N,O and N,S donor Schiff base ligands
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Manganese(II) complexes having the general composition Mn(L)2X2 (where L = 3‐bromoacetophenone semicarbazone, 3‐bromoacetophenone thiosemicarbazone, 1‐tetralone semicarbazone, 1‐tetralone thiosemicarbazone, flavanone semicarbazone or flavanone thiosemicarbazone and X = Cl? or ½SO42?) were synthesized. All the complexes were characterized using elemental analyses, molar conductance and magnetic moment measurements, and mass, 1H NMR, infrared, electron paramagnetic resonance and electronic spectral studies. The molar conductance of the complexes in dimethylsulfoxide lies in the range 10–20 Ω?1 cm2 mol?1 indicating their non‐electrolytic nature. All the complexes show magnetic moments corresponding to five unpaired electrons. The possible geometries of the complexes were assigned on the basis of electron paramagnetic resonance, electronic and infrared spectral studies. Some of the synthesized ligands and their complexes were screened for their antifungal activities against fungi Macrophomina phaseolina, Botrytis cinerea and Phoma glomerata using the food poison technique and their antibacterial activities against Xanthomonas campestris pv. campestris and Ralstonia solanacearum using the paper disc diffusion method. They showed appreciable activities. 相似文献
5.
Khatri Savita Hooda Pooja Ahlawat Pratibha Khatkar S. P. Taxak V. B. Kumar Rajesh 《Research on Chemical Intermediates》2022,48(4):1685-1716
Research on Chemical Intermediates - Five luminescent ternary and one binary Europium(III) complexes were synthesised with β-keto acid as primary ligand and neocuproine(neo),... 相似文献
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Desai Neha S. Barhate Chandrashekhar R. Biyani Sheetal O. Kulkarni Savita R. Nagarsenker Mangal S. 《平面色谱法杂志一现代薄层色谱法》2011,24(4):306-311
JPC – Journal of Planar Chromatography – Modern TLC - Annona squamosa, commonly known as custard apple, possesses various medicinal properties such as antimicrobial, insecticidal,... 相似文献
9.
Sharma SK May PS Jones MB Lense S Hardcastle KI MacBeth CE 《Chemical communications (Cambridge, England)》2011,47(6):1827-1829
The ligand bis(2-isobutyrylamidophenyl)amine has been prepared and used to stabilize both mononuclear and dinuclear cobalt(II) complexes. The nuclearity of the cobalt product is regulated by the deprotonation state of the ligand. Both complexes catalytically oxidize triphenylphosphine to triphenylphosphine oxide in the presence of O(2). 相似文献
10.
M.F. Carrasco S.K. Mendiratta L. Marques 《Applied Physics A: Materials Science & Processing》2005,80(2):361-367
High-energy ball milling is a relatively new process for the synthesis of technologically useful compounds that require high temperatures in the conventional solid-state reaction method. It is thought that high-impact energy transferred to microscopic amounts of powder momentarily trapped between two colliding balls leads to a local transient of high pressure and temperature that drives the reaction at the surface of the trapped particles. The technique of ball milling has been successfully used to produce nanocrystals of the sillenite phase of bismuth silicate (BSO), and its titanate (BTO) and germanate (BGO) homologues. Our aim in this paper is to see, experimentally, whether passage through an intermediate phase occurs en route to the final product. The results of our study using various analytical techniques show that indeed, in the case of BSO and BTO, an intermediate phase is formed temporarily along the grinding route. The SEM pictures of the powders in the various stages of the grinding process also indicate that a process of phase transformation takes place at the surface of the crystals. We have not been able to identify the precise structure of the intermediate phase, but show that it is an unstable phase that transforms with heat treatment preferentially into the desired sillenite phase in the case of BTO and to the reactants in the case of BSO. PACS 81.20.Ev 相似文献