Browsing Department of Chemistry by Issue Date
Now showing items 1-20 of 677
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Sedimentation rates in the central lake constance determined with210Pb and137Cs
(Birkhäuser-Verlag, 1987)Sediment cores from central Lake Constance were dated with210Pb and137Cs. A sedimentation rate of (0.11±0.02) g·cm-2·y-1 was determined with the210Pb method.137Cs measurements revealed sedimentation rates of (0.11±0.01) ... -
Sorption of cesium and strontium on montmorillonite and kaolinite
(De Gruyter Oldenbourg, 1988)Sorption characteristics of Cs+ and Sr++on montmorillonite and kaolinite type clays and soil fractions from various regions of Turkey were studied using the batch method. 137Cs and 90Sr were used as tracers. Concentrations ... -
Efficiency calibration and summation effects in gamma-ray spectrometry
(Kluwer Academic Publishers, 1988)Precise, absolute γ-ray efficiences (∈γ) and total efficiences (∈T), have been measured at various distances from the detector, using a set of standards. The observed linear variation of ∈γ and ∈T as well as ∈γ/∈T with Eγ ... -
Sorption/desorption of Cs on clay and soil fractions from various regions of Turkey
(Elsevier, 1988)The sorption desorption behaviour of Cs ion in the concentration region of 10−8 to 10−4 meqml−1 have been studied using clay and soil fractions from various regions of Turkey. The sorption curves for all the material studied ... -
Superficial deep-water sediments of the Eastern Marmara Basin
(Springer-Verlag, 1989)Superficial sediments (top ∼ Im) of the Eastern Mediterranean Basin, Sea of Marmara, Turkey accumulated rapidly (0.087 ± 0.012 g/cm2 · y) by hemipelagic sedimentation with only limited amounts of gravity flow or bottom ... -
Sorption of barium on kaolinite, montmorillonite and chlorite
(Royal Society of Chemistry, 1989)The sorption characteristics of the Ba2+ ion on kaolinite, montmorillonite and chloritetype clays were studied using the batch method. Barium-133 was used as a tracer. The Ba2+ ion concentrations ranged from 10-8 to 10-5 ... -
Wave-packet calculation of sharp-energy S-matrix elements for a three-body system in the breakup regime
(American Physical Society, 1990)Sharp-energy S-matrix elements have been successfully extracted from a wave-packet description of three-boson and quartet-spin, neutron-deuteron scattering at energies well above the breakup threshold. Essential to the ... -
Coupled-arrangement-channel method for time-dependent wave-packet description of three-body dynamics
(American Physical Society, 1990)An alternative discretization method treating rearrangement and breakup channels on equal footing is introduced for wave-packet description of three-body dynamics. The permutational symmetry for three identical particles ... -
Sorption-desorption behaviour of barium on clays
(Elsevier, 1990)Batch experiments were performed to study the sorption behaviour of Ba2+ ion on three different clay minerals determined to be predominantly kaolinite, montmorillonite and mixed chlorite-illite. Synthetic groundwater was ... -
Sorption Studies of Radioiodine on Soils with Special References to Soil Microbial Biomass
(1991)In batch experiments with two types of soils, chernozem and podzol, radioiodine (125I) showed an initial rapid sorption, followed by a long and slow further increase. Very little sorption (Rd < 1) was detected in clay ... -
Coupled-reaction-channel calculation of a model n-d scattering problem above the breakup threshold
(1991)An s-wave local potential model of n-d scattering at collision energies above the breakup threshold is solved using a pseudochannel extension of the coupled-reaction-channel method. Results obtained for both quartet and ... -
Simulation of the breakup channel in three-particle collisions with pseudoreaction channels
(1991)A pseudochannel extension of the coupled-reaction-channel (CRC) method is investigated formally and numerically as a means of simulating the effect of the breakup channel on the rearrangement amplitudes. The equations of ... -
Pseudostate description of breakup in the coupled-reaction-channel method: Numerical study of nonorthogonality effects
(1991)To simulate the effects of the breakup channel on rearrangement amplitudes, the conventional coupled-reaction-channel (CRC) expansion is augmented by pseudoreaction channels. The construction of the projector for the ... -
Theories of intramolecular vibrational energy transfer
(1991)Intramolecular vibrational energy transfer is a process central to many physical and chemical phenomena in molecules. Here, various theories describing the process are summarized with a special emphasis on nonlinear ... -
Wave-packet propagation in momentum space: Calculation of sharp-energy S-matrix elements
(1992)This paper examines momentum-space methods as a means of implementing a scattering-theoretic, long-time lemma on the extraction of sharp-energy S-matrix elements from a wave-packet description of collisions. In order to ... -
Isomeric yields of130Sb, 132Sb, 134I, and 136I in the thermal neutron fission of235U
(Kluwer Academic Publishers, 1992)Isomer yield ratios of130Sb,132Sb,134I and136I isomers formed in the thermal neutron fission of235U have been calculated from our previous experimental studies that led to the identification of these species. In those ... -
Fine structure of mass and charge distribution in low energy fission
(Akademiai Kiado Rt., 1992)Studies of finer details in mass and charge distribution fission leads to a better understanding of the fission process. Experimental determination of independent and cumulative yields using radiochemical techniques as ... -
Determination of electron affinity of phenyl radical by dissociative electron attachment technique
(John Wiley & Sons, 1993-03) -
Characterization of degradation products of polyethylene oxide by pyrolysis mass spectrometry
(Pergamon Press, 1994)The techniques of direct and indirect (evolved gas analysis) pyrolysis MS are used to characterize the thermal degradation products of polyethylene oxide. Using direct pyrolysis MS technique the main degradation process ... -
Analysis of polymers using evolved-gas and direct-pyrolysis techniques
(Royal Society of Chemistry, 1994)Thermal analysis of polystyrene, poly(p-methylstyrene) and poly(α-methylstyrene) has been carried out using evolved-gas analysis by infrared and mass spectrometry, and direct-pyrolysis analysis by mass spectrometric ...
