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Markov V.V.,Bryansk State University | Lebedeva L.I.,Bryansk State University | Kanatnikov N.V.,State University Education Science Production Complex
IOP Conference Series: Materials Science and Engineering | Year: 2015

The article describes technological aspects of the marking process using solid-state fibre laser. It presents the analysis of the technological modes and errors of the precise laser marking and establishes low density of the laser system as one of the causes of the poor quality of a laser seam. The article reviews the use of the following material laser marking is performed on - plastic with fine metal and conductive surface coating. © Published under licence by IOP Publishing Ltd. Source

Palmer S.,University of Dundee | Litvinova K.,Aston University | Dunaev A.,State University Education Science Production Complex | Fleming S.,University of Dundee | And 2 more authors.
Biomedical Optics Express | Year: 2016

Muscle invasive urinary bladder cancer is one of the most lethal cancers and its detection at the time of transurethral resection remains limited and diagnostic methods are urgently needed. We have developed a muscle invasive transitional cell carcinoma (TCC) model of the bladder using porcine bladder scaffold and the human bladder cancer cell line 5637. The progression of implanted cancer cells to muscle invasion can be monitored by measuring changes in the spectrum of endogenous fluorophores such as reduced nicotinamide dinucleotide (NADH) and flavins. We believe this could act as a useful tool for the study of fluorescence dynamics of developing muscle invasive bladder cancer in patients. © 2016 Optical Society of America. Source

Frolenkova L.Y.,State University Education Science Production Complex | Shorkin V.S.,State University Education Science Production Complex
PNRPU Mechanics Bulletin | Year: 2013

There are a number of problems for successful solutions to be aware of the surface energy, the energy and the force of adhesion and cohesion. An example is that of the bundle composites. The expression of the energy strength criterion is the total surface energy of the contacting elements or energy of adhesion. These values are determined by methods of the classical theory of elasticity is impossible. Power strength criteria using the limit values of powers - forces of adhesion and cohesion. They are usually determined experimentally, it is not always possible or economically unprofitable. The authors proposed a method for calculating the surface and adhesion energies of elastic bodies in a state of adhesion. It was considered by the authors as follows. Distributed over the boundary of the total surface energy is distributed over its volume free energy change occurring during the formation of the border. The adhesion of the two bodies along the contact surface is formed by a transition layer. In its physical and thermodynamic properties of one body continuously into the properties of another body. The method is based on a variant of the gradient model of continuous elastic medium. It is based on the assumption of many-potential nonlocal interaction infinitely small particles that make up the environment. More to the classic characteristics of the elastic state is calculated by differentiating the known expression bulk density of free energy. It is built on the basis of additional assumptions about the composition of the medium: the elastic part, the phonon and electron (for metals) gases. Source

Savin L.,State University Education Science Production Complex | Kornaev A.,State University Education Science Production Complex | Kornaeva E.,State University
Applied Mechanics and Materials | Year: 2014

The paper investigates the two-dimensional flow of an incompressible viscous fluid of complex rheology in the gap between two cylinders with respect to fluid friction bearings. The viscosity of the fluid is defined as a physical quantity field, satisfying the criterion of minimum friction loss approximated as a function of shear-strain rate and pressure. The resulting function is used to calculate the carrying capacity and the friction torque in the bearing. Computer experiment resulted in showing the effect of friction loss lowering due to considering complex rheology of lubricating material. © 2014 Trans Tech Publications, Switzerland. Source

Rafailov I.E.,Aston University | Dremin V.V.,State University Education Science Production Complex | Litvinova K.S.,Aston University | Dunaev A.V.,State University Education Science Production Complex | And 2 more authors.
Journal of Biomedical Optics | Year: 2016

Urinary bladder diseases are a common problem throughout the world and often difficult to accurately diagnose. Furthermore, they pose a heavy financial burden on health services. Urinary bladder tissue from male pigs was spectrophotometrically measured and the resulting data used to calculate the absorption, transmission, and reflectance parameters, along with the derived coefficients of scattering and absorption. These were employed to create a "generic" computational bladder model based on optical properties, simulating the propagation of photons through the tissue at different wavelengths. Using the Monte-Carlo method and fluorescence spectra of UV and blue excited wavelength, diagnostically important biomarkers were modeled. Additionally, the multifunctional noninvasive diagnostics system "LAKK-M" was used to gather fluorescence data to further provide essential comparisons. The ultimate goal of the study was to successfully simulate the effects of varying excited radiation wavelengths on bladder tissue to determine the effectiveness of photonics diagnostic devices. With increased accuracy, this model could be used to reliably aid in differentiating healthy and pathological tissues within the bladder and potentially other hollow organs. © 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

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