Abstract
The effect of deformation of the surface of a supporting metal element on the adhesion of a thin polymer film has been studied by an experimental-theoretical method. A setup has been ...developed that allows testing of adhesive coatings at various deformations of the substrate surface of various materials. The adhesion properties of a polymer film to a metal substrate have been determined. An explanation of the results obtained is given.
Motion correction in MRI of the brain Godenschweger, F; Kägebein, U; Stucht, D ...
Physics in medicine & biology,
03/2016, Letnik:
61, Številka:
5
Journal Article
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Subject motion in MRI is a relevant problem in the daily clinical routine as well as in scientific studies. Since the beginning of clinical use of MRI, many research groups have developed methods to ...suppress or correct motion artefacts. This review focuses on rigid body motion correction of head and brain MRI and its application in diagnosis and research. It explains the sources and types of motion and related artefacts, classifies and describes existing techniques for motion detection, compensation and correction and lists established and experimental approaches. Retrospective motion correction modifies the MR image data during the reconstruction, while prospective motion correction performs an adaptive update of the data acquisition. Differences, benefits and drawbacks of different motion correction methods are discussed.
A method of surgical treatment of midshaft clavicular fractures and a compression interlocking nail for osteosyn-thesis of the clavicle were developed. Strength characteristics of various ...bone−implant−bone systems in osteosyn-thesis of midshaft clavicular fractures were compared. It was shown that none of the tested fixation techniques provides stability under conditions of axial loading comparable to that of an intact clavicle. The developed design can be recommended as a method of choice for osteosyn-thesis of midshaft clavicular fractures, as it demonstrated strength characteristics comparable to those of other systems.
Abstract
This work describes a method for using the power parameters of the Lennard-Jones central potential to simulate phenomena in the technology of material processing by a vapor-gas discharge ...plasma with a liquid electrode.
The approaches have been assessment of adhesion of a thin layer covering the surface of a cylindrical cover have been developed. An example of determination of adhesion from internal pressure and ...also an example of a research of adhesion have been considered at a cover bend. The method is a reliable tool for adhesive definition.
A method for calculating the power parameters of a potential of the Lennard-Jones type for a number of individual gases, which can be products released during the ignition and combustion of a ...gas-vapor discharge with a liquid electrode, is presented. The information obtained makes it possible to calculate the viscosity and diffusion coefficients of individual gases and gas mixtures, which will make it possible to solve a range of problems when modeling processes in the processing technology of various materials (substances) by vapor-gas discharge plasma with a liquid electrode.
Abstract
This paper describes the application of the least squares and least modulus methods to obtain the values of the power parameters of the central Lennard-Jones potential when modeling ...processes in the technology of processing materials with vapor-gas discharge plasma with a liquid electrode.
Abstract
The processes that occur at the solid electrode-electrolyte interface and in the discharge gap during surface treatment with a vapor-gas discharge are a set of various interrelated ...phenomena, such as physical, chemical and electrochemical ones. The main physicochemical phenomena that determine the process of processing metal surfaces are the electric field, modes of heat and mass transfer between the processed metal surface and the liquid medium (electrolyte). Due to the large number of physical parameters that significantly affect the processing of a part, difficulties arise in planning and conducting experiments in order to optimize the technology for processing metal surfaces. This problem can be solved using mathematical modeling, which allows you to explore various processes and phenomena at no additional cost. The proposed mathematical model will be useful both at the stage of processing the measurement results and in preparing for the experiment.
On the basis of coatings a lot of technical and economic problems are solved. Functional and smart coatings are developed, which are formed directly on the curvilinear surfaces of structural ...elements. An experimental-theoretical method for evaluating the stiffness properties and adhesion of a thin-layer coating of a complex structure formed on a cylindrical surface is developed. The method is a reliable tool both for determining the mechanical properties of a coating and an adhesive, and for studying the effect of physical fields and media on changing these properties. An example of a study is considered.
Plasma cleaning with simultaneous polishing by a jet electric discharge is more efficient than electrochemical polishing. The paper discusses the processes arising during the interaction of an ...electric discharge with solutions of inorganic substances, and studies the propagation of an inorganic discharge in a liquid on the surface of various materials (NaCl, NH
4
NO
3
, and discharge in glycerol). A NH
4
NO
3
solution is shown to be the most effective electrolyte. We report on current‒voltage characteristics obtained for an electric discharge between a jet electrolytic cathode and a solid anode, as well as for a multichannel discharge in a jet electrolytic cathode at different jet lengths and diameters.
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