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Showing 1 to 20 of 61 for “"concentration dependence"”.
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Molecular weight and concentration dependence of the thermal conductivity of polystyrene in benzene
… of polystyrene in benzene solutions at concentrations of 0.l to 15 weight percent were measured at 25° C and atmospheric pressure. Osmotic pressure measurements and information supplied by the manufacturer indicated number average molecular weights (M̅<sub>N</sub>) of 21,000, 264,000, …
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Gravimetric, neutron scattering and computational studies of the sorption and diffusion of gases in zeolites
… features of the systems, such as the concentration dependence and ratio of the diffusion coefficients are observed. This technique provides a valuable bridge between traditional Molecular Dynamics and Metropolis et al algorithm Monte Carlo simulations as the evolution of the system can …
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Carbon nanotube-based sensors for label-free protein detection
… improved with these SWNT. Further, we observe a concentration dependence of the effective equilibrium dissociation constant, KD,eff, which is in good agreement with previous reports, yet has eluded mechanistic description due to complexities associated with multivalent interactions. We show that …
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Rheological Study of Concentrated Silica Suspensions
… The viscometric data was analyzed for shear dependence, solid concentration dependence and pH dependence. The data for electrophoretic mobility was analyzed for pH dependence.</p><p>The experimental data was applied to the Bingham plastic model and the power law model and the power law model …
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FLORESCENCE AND unconversion IN CAF[2]:HO[3+]
… wavelength, The spectra of CaF2 doped with Ho3+ concentration ranging from 0.01 % to 10 % were systematically recorded at liquid nitrogen temperatures. Lifetimes of certain new fluorescence lines were determined. From the lifetime data, the corresponding single-ion sites of the fluorescence lines …
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Molecular beam epitaxial growth and characterization of indium antimonide on gallium arsenide
… proposed to explain the temperature and carrier concentration dependence of electron mobility. Low temperature PL shows a single band-edge transition similar to that of bulk InSb, indicating very little or no residual strain in the epilayers.
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Measurement of the dependence of the averaged internal mode on the scattering vector and of the first internal mode on the concentration of polystyrene in solution using photon correlation spectroscopy
… different wavelengths was scattered from local concentration fluctuations in the polymer and autocorrelation function was calculated; The autocorrelation function can be written as a sum of decaying exponentials. The center-of-mass mode with a decay constant Dq{dollar}\sp2{dollar} is contained …
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Οπτικές ιδιότητες του αραιού μαγνητικού ημιαγωγού Ζn₁₋ₓΜnₓS
… semiconductor Ζn₁₋ₓΜnₓS has been carried out for concentrations x=0.03-0.5. The effects on the spectra of high-low temperature (T=20-1300K), hydrostatic pressure (p=0-5 GPa), and the excitation wavelength (λ=3507-6764 A) have been examined in detail. Based on the luminescence spectra the …
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Basics of detached Bridgman growth of Ge1-xSix crystals
… Contact angles of Ge and Ge1-xSix (with Si concentrations up to 14 at-) were measured for a variety of potential crucible materials using the sessile drop technique. The surface tension of Ge and Ge1-xSix, as well as its temperature and concentration dependence, was determined …
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Thermische Tieftemperatureigenschaften von Seltenerd-Übergangsmetall-Borkarbiden
… field Hc2(0), of the negative curvature of the H-dependence of the T-linear specific heat contribution gamma(H), and in the reduction of the positive curvature of Hc2(T) near Tc. But isoelectronic rare earth substitutions do not result in the transition from clean to dirty limit. Due to …
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Studying Collagen with PyrATS: Pyrene-Appended Trimeric Systems
… using fluorescence spectroscopy, including concentration dependence, folding directionality, and local fraying, upon solutions that are significantly more dilute than those customarily used in circular dichroism (CD) experiments. Notably, for most of the peptides studied, there is agreement …
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Pseudorotaxanes and Supramolecular Polypseudorotaxanes Based on the Dibenzo-24-Crown-8/Paraquat Recognition Motif
… constant of the pseudorotaxane to decrease. The concentration dependence of apparent association constants, Ka,exp, of fast exchange host-guest systems was studied for the first time by using complexes based on viologens and crown ethers as examples. While the bis(hexafluorophosphate) salts of …
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An experimental study of the magnetic linear birefringence and dichroism of liquids, solutions and dispersions
… At volume fractions greater than about 0.1, the concentration dependence of the birefringence and dichroism were markedly different, and not explicable on the basis of angular correlation between the colloidal particles.
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The Behaviour of Daphnia pulex de Geer in a temperature gradient, with special reference to the effect of exposure to D.D.T. upon the selected temperature
… at 15ºC and 20ºC. Exposure to varying concentrations of the DDT-carrier ethanol resulted in decreases in the selected temperatures to values below that shown by untreated daphnia but concentration-dependence was not shown. A trend to a concentration-dependent increase in selected …
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Optical and transport studies of atomic hydrogen and chalcogen impurities in alkali metals
… host lattices, and the observed energy width and concentration dependence of the optical profile confirms this deduction.
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Ionic conductivities in mixtures of N,N-dimethylformamide with water
… constant and against the logarithm of water concentration show maxima. In the latter case, some evidence is presented that this indicates the participation of both water and DMF in the formation of ion-pairs in DMF/water mixtures The autogenic rising boundary method has been used to …
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Bipolar Pulse Conductance Measurements With Ion-Selective Electrodes
… measured current is proportional to log (calcium concentration) rather than log (calcium activity), and it is shown that voltage pulses greater than 15 mV in amplitude are responsible for the concentration dependence. Also voltage pulses force the ISE to respond to abrupt changes in Ca('2+) …
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Multi-Dimensional Dopant Profiling With Atomic Resolution by Scanning Tunneling Microscopy
… a depression in the empty state image. The bias dependence, depth dependence and dopant concentration dependence of the dopant induced features were investigated in detail. Based on scattering theory, the numerical calculation was performed to achieve a fundamental understanding of dopant induced …
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Percolation phenomena in amorphous iron-nickel alloys
… the production of alloys that span the entire concentration range from paramagnetic (p=O) to ferromagnetic (p=l). The phase diagram has the features expected for a dilute ferromagnet. The low-temperature approach to magnetic saturation is a function of concentration. The more dilute alloys do …
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Hydration and activity studies of bovine skeletal muscle proteins and wheat gliadins by nuclear magnetic resonance
… suspensions were carried out as a function of concentration, pH/pD, and salt. Numerical analysis of the data was performed by nonlinear regression on an Apple-MacIntosh II microcomputer, using a thermodynamic linkage approach. The second virial coefficient, B$\sb{\rm o}$, of myosin $A$ and $B$ …
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