1,223 research outputs found
Theoretical study of phase behaviour of DLVO model for lysozyme and -crystalline aqueous electrolyte solutions
Mean spherical approximation (MSA), second-order Barker-Henderson (BH)
perturbation theory and thermodynamic perturbation theory (TPT) for associating
fluids in combination with BH perturbation theory are applied to the study of
the structural properties and phase behaviour of the
Derjaguin-Landau-Verwey-Overbeek (DLVO) model of lysozyme and
-cristalline aqueous electrolyte solutions. Predictions of the MSA for
the structure factors are in good agreement with the corresponding computer
simulation predictions. The agreement between theoretical results for the
liquid-gas phase diagram and the corresponding results of the experiment and
computer simulation is less satisfactory, with predictions of the combined
BH-TPT approach being the most accurate.Comment: 9 pages, 3 figure
Virial expansions and augmented van der Waals approach: Application to Lennard-Jones-like Yukawa fluid
We argue that recently proposed [Melnyk et al., Fluid Phase Equilibr., 2009,
Vol. 279, 1] a criterion to split the pair interaction energy into two parts,
one of which is forced to be responsible the most accurate as possible for
excluded volume energy in the system, results in expressions for the virial
coefficients that improve the performance of the virial equation of state in
general, and at subcritical temperatures, in particular. As an example,
application to the Lennard-Jones-like hard-core attractive Yukawa fluid is
discussed.Comment: 12 pages, 6 figure
An automated system for chromosome analysis. Volume 1: Goals, system design, and performance
The design, construction, and testing of a complete system to produce karyotypes and chromosome measurement data from human blood samples, and a basis for statistical analysis of quantitative chromosome measurement data is described. The prototype was assembled, tested, and evaluated on clinical material and thoroughly documented
An Automated System for Chromosome Analysis
The design, construction, and testing of a complete system to produce karyotypes and chromosome measurement data from human blood samples, and to provide a basis for statistical analysis of quantitative chromosome measurement data are described
Mean spherical approximation for the Lennard-Jones-like two Yukawa model: Comparison against Monte Carlo data
Monte Carlo simulation studies are performed for the Lennard-Jones like two
Yukawa (LJ2Y) potential to show how properties of this model fluid depend on
the replacement of the soft repulsion by the hard-core repulsion. Different
distances for the positioning of hard core have been explored. We have found,
that for temperatures that are slightly lower and slightly higher of the
critical point temperature for the Lennard-Jones fluid, placing the hard core
at distances that are shorter than zero-potential energy is well justified by
thermodynamic properties that are practically the same as in original LJ2Y
model without hard core. However, going to extreme conditions with the high
temperature one should be careful since presence of the hard core provokes
changes in the properties of the system. The later is extremely important when
the mean spherical approximation (MSA) theory is applied to treat the
Lennard-Jones-like fluid.Comment: 11 pages, 13 figure
Automatic generation of tasks and their automatic solutions in application software
Досліджено проблему формалізації процесу побудови та розв’язання задач з метою підвищення якості передавань знань та практичних навиків. Проаналізовано відомі підходи до вирішення проблеми автоматичної генерації практичних задач та їх розв’язання. Запропоновано метод генерації множини задач та їх автоматичного розв’язання в прикладному програмному середовищі. Показано, що даний метод володіє низкою переваг перед існуючими, що підтверджується експериментальними дослідженнями.In this paper the problem of formalizing the process of building and solving tasks is analized, existing approaches to solve this problem is analized, described their main advantages and disadvantages. The method of automatic generation of tasks and their solutions in application software are proposed. This method has several advantages over existing, as evidenced by experiments
Features of the unconventional gas deposits development
This article generalizes the data on reserves and production of shale gas in different countries. It also analyzes the peculiarities of the geological structure and development of the shale gas and gas in dense rock deposits. As to the development of shale gas deposits with a net of horizontal wells with multi-stage hydraulic bed fracture, it presents the effect of the factor of the rock matrix permeability, half-length fracture and the distance between fractures on the gas recovery
Competition between Two Kinds of Correlations in Literary Texts
A theory of additive Markov chains with long-range memory is used for
description of correlation properties of coarse-grained literary texts. The
complex structure of the correlations in texts is revealed. Antipersistent
correlations at small distances, L 300 define
this nontrivial structure. For some concrete examples of literary texts, the
memory functions are obtained and their power-law behavior at long distances is
disclosed. This property is shown to be a cause of self-similarity of texts
with respect to the decimation procedure.Comment: 7 pages, 7 figures, Submitted to Physica
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