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11.
12.
Marcelle Gaune-Escard A. Bogacz L. Rycerz W. Szczepaniak 《Journal of Thermal Analysis and Calorimetry》1995,45(5):1117-1124
Present work is a part of thermodynamic research program on the MX?LnX3 system (M=alkali metal,X=Cl, Br andLn=lanthanide). Molar enthalpies of mixing in the LiBr?NdBr3, NaBr?NdBr3 and KBr?NdBr3 liquid binary systems have been determined at temperature 1063 K by direct calorimetry in the whole range of composition. Investigated systems are generally characterized by negative enthalpies of mixing with minimum atX NdBr3≈0.3–0.4. These enthalpies decrease with decrease of ionic radii of alkali metals. Molar enthalpies of solid-solid and solid-liquid phase transitions of K3NdBr6 and Cs3NdBr6 have been also determined by differential scanning calorimetry (DSC). K3NdBr6 is formed at 689 K from KBr and K2NdBr5 with enthalpy of 44.0 kJ·mol?1 whereas Cs3NdBr6 is stable at ambient temperature and undergoes phase transition in the solid state at 731 K with enthalpy of 8.8 kJ·mol?1. Enthalpies of melting have been also determined. 相似文献
13.
High selectivity between oxygen and nitrogen has been found by gas permeation with doped polyaniline. Because of the small difference in kinetic diameters, solubility rather than diffusion may explain the preferential oxygen permeation. Electron spin resonance (ESR) measurements have been performed to check whether interactions of oxygen with polarons in polyaniline exist. A tenfold decrease in the spin number was observed when the polymer was in the presence of oxygen rather than nitrogen. This result was interpreted as being due to interactions between oxygen triplet states and polarons of polyaniline. 相似文献
14.
D. Bertrand G. Bertrand-Coremans R. Blaes F.W. Bullock M. Dewit B. Escoubes E. Fett A. Haatuft A. Halsteinslid T.W. Jones J.G. Morfin K. Myklebost J.M. Olsen P. Petitjean M. Pohl F. Rahimi P.N. Ratoff J. Sacton L.C. Welch 《Physics letters. [Part B]》1979,84(3):354-356
Candidates for the purely leptonic process have been searched for in the bubble chamber Gargamelle exposed to the CERN-SPS antineutrino wide-band beam. No single e?, of energy greater than 1 GeV, was found in a total of 230 000 pictures, corresponding to 7400 charged current events. This leads to an upper limit for the observed cross section of cm2 (90% C.L.). Interpretation of this value in terms of the standard W Weinberg-Salam model yields an upper limit to the mixing parameter sin2θW < 0.39 at 90% C.L. 相似文献
15.
Spectroscopic and chemical evidence is presented in support of the structure of 7α,11β-diacetoxydihydronomilin (I) obtained from a benzene extract of the dehisced fruit capsules of . 相似文献
16.
Water adsorption on kaolinite is a specific cooperative adsorption which does not satisfy the fundamental hypothesis of the BET theory.The adsorption isotherms on different homoionic samples show the effect of the hydration energy of the active sites (exchangeable cations) on quantitative adsorption data.The corresponding calorimetric curves present a maximum which characterizes interactions in the adsorbed phase. A relationship is apparent between these interactions and the electric field or the polarizability of the fixed cation, these factors determining the nature of the bond between the surface and cation.From the experimental data, we may propose an approximative value for the number of molecules which compose the primary hydration sheath of the active sites. 相似文献
17.
18.
Rolf Stomberg Knut Lundquist Marcelle Hauteville Hans Geiger 《Journal of chemical crystallography》1991,21(2):183-188
The crystal structure of protogenkwanin, C16H14O6, has been determined by single-crystal diffraction methods. The compound crystallizes in the monoclinic space groupP21/c witha=6.804(4),b=7.457(3),c=26.234(3)Å,=95.66(2)° andZ=4. A total of 3275 unique reflection intensities were recorded on a Rigaku AFC6R diffractometer (MoK radiation) at room temperature. The structure was solved by direct methods and electron density calculations. Full-matrix least-squares refinement gaveR=0.058 for 1257 observed [I>3(I)] reflections. Thecrystal structure confirms results from earlier studies on protogenkwanin and elucidates the steric orientation of the hydroxyl substituents of the cyclohexadiene ring: the hydroxyl groups aretrans orientated. 相似文献
19.
Kudryavtsev V Felekyan S Woźniak AK König M Sandhagen C Kühnemuth R Seidel CA Oesterhelt F 《Analytical and bioanalytical chemistry》2007,387(1):71-82
A new general strategy based on the use of multiparameter fluorescence detection (MFD) to register and quantitatively analyse
fluorescence images is introduced. Multiparameter fluorescence imaging (MFDi) uses pulsed excitation, time-correlated single-photon
counting and a special pixel clock to simultaneously monitor the changes in the eight-dimensional fluorescence information
(fundamental anisotropy, fluorescence lifetime, fluorescence intensity, time, excitation spectrum, fluorescence spectrum,
fluorescence quantum yield, distance between fluorophores) in real time. The three spatial coordinates are also stored. The
most statistically efficient techniques known from single-molecule spectroscopy are used to estimate fluorescence parameters
of interest for all pixels, not just for the regions of interest. Their statistical significance is judged from a stack of
two-dimensional histograms. In this way, specific pixels can be selected for subsequent pixel-based subensemble analysis in
order to improve the statistical accuracy of the parameters estimated. MFDi avoids the need for sequential measurements, because
the registered data allow one to perform many analysis techniques, such as fluorescence-intensity distribution analysis (FIDA)
and fluorescence correlation spectroscopy (FCS), in an off-line mode. The limitations of FCS for counting molecules and monitoring
dynamics are discussed. To demonstrate the ability of our technique, we analysed two systems: (i) interactions of the fluorescent
dye Rhodamine 110 inside and outside of a glutathione sepharose bead, and (ii) microtubule dynamics in live yeast cells of
Schizosaccharomyces pombe using a fusion protein of Green Fluorescent Protein (GFP) with Minichromosome Altered Loss Protein 3 (Mal3), which is involved
in the dynamic cycle of polymerising and depolymerising microtubules. 相似文献
20.
Leszek Rycerz Ewa Ingier-Stocka Slobodan Gadzuric Marcelle Gaune-Escard 《Journal of Thermal Analysis and Calorimetry》2010,101(2):455-461
Differential Scanning Calorimetry was used to study phase equilibrium in EuBr2–RbBr binary system. It was established that this system includes two eutectics and three stoichiometric compounds. First
of them, Rb2EuBr4, decomposes peritectically at 778 K. Second one, RbEuBr3, undergoes the solid–solid phase transition at 732 K and melts incongruently at 852 K. Third compound, RbEu2Br5, melts congruently at 888 K. The composition and temperature values of eutectics were determined as x(EuBr2) = 0.316; T
eut = 776 K and x(EuBr2) = 0.797; T
eut = 859 K. Mixing enthalpy was measured by direct calorimetry on the whole composition range. The minimum of the mixing enthalpy
occurs around the composition x(EuBr2) ≈ 0.4. The electrical conductivity of liquid mixtures was also investigated over the whole composition range and measured
down to temperatures below solidification. The specific conductance (liquid phase) plotted against the mole fraction of EuBr2 shows a broad minimum at x(EuBr2) ~ 0.6. The activation energy for conductivity changes with temperature. Results obtained are discussed in terms of possible
complex formation. 相似文献