Influence of Phase Diffuser Dynamics on Scintillations of Laser Radiation in Earth Atmosphere: Long-Distance Propagation

The effect of a random phase diffuser on fluctuations of laser light (scintillations) is studied. Not only spatial but also temporal phase variations introduced by the phase diffuser are analyzed. The explicit dependence of the scintillation index on finite-time phase variations is obtained for long propagation paths. It is shown that for large amplitudes of phase fluctuations, a finite-time effect decreases the ability of phase diffuser to suppress the scintillations.Comment: 15 pages, 4 figure

Влияние роющей деятельности крота (Talpa еuropаеa) на почвенную микрофлору при загрязнении почвы кадмием

Influence of fossorial activity of European mole Talpa еuropаеа on number and distribution of soil microorganisms under conditions of cadmium pollution of the soil is characterized. Mammals’ fossorial activity is an important natural ecological factor that contributes to microflora rehabilitation and development under conditions of contamination.Охарактеризовано вплив рийної діяльності крота (Talpa еuropаеа) на кількість і розповсюдження ґрунтових мікроорганізмів в умовах забруднення ґрунту кадмієм. Встановлено, що рийна активність ссавців є важливим природним екологічним чинником, що сприяє відновленню та розвитку мікрофлори в умовах забруднення. Охарактеризовано вплив рийної діяльності крота (Talpa еuropаеа) на кількість і розповсюдження ґрунтових мікроорганізмів в умовах забруднення ґрунту кадмієм. Встановлено, що рийна активність ссавців є важливим природним екологічним чинником, що сприяє відновленню та розвитку мікрофлори в умовах забруднення

Incorporation and localisation of ganglioside GM3 in human intimal atherosclerotic lesions

AbstractImmunohistochemical examination showed that sections of intimal atherosclerotic plaques contained cells and cell clusters as well as areas of extracellular matrix specifically stained with antibodies against ganglioside GM3. No immunohistochemical staining was observed in areas bordering the plaques where there was no histological evidence of atherosclerosis. To determine whether the ganglioside GM3 deposits in the intimal plaques derived directly from plasma or were synthesised by intimal cells, intimal plaque and plasma LDL were assayed for ganglioside GM3 fatty acid composition. This assay showed that more than 50% of the fatty acids of GM3 isolated from both atherosclerotic and normal intima are either minor fatty acids or those absent from LDL GM3. We conclude that the GM3 deposits present in intimal plaque arise in intimal cells and do not derive from plasma LDL

Optimized sensorless control systems for cargo movement mechanisms

THE PURPOSE. Investigation of the control system of the cargo movement mechanism when using different variants of sensorless control. The search for the optimal option, in which the formation of the speed is identical to the data obtained from the speed sensor. Analysis of the results obtained during the study, including the results obtained taking into account the heating of the motor windings. METHODS. The tasks set during the research are implemented by simulation modeling using the Matlab Simulink computer simulation environment. RESULTS. The article considers systems with different types of velocity observers. A system is implemented that takes into account the heating of the stator and rotor windings of an asynchronous motor, in which a non-adaptive observer and different types of neural network controller were introduced. A combined method of using neural network regulators is proposed. CONCLUSION. Sensorless control systems are relevant for use in industries with the presence, according to the conditions of the technological process, of high temperatures. The conducted research has shown that the use of neural network technologies allows you to work with settings of different levels and types. The proposed method, implying the use of joint work of neural network observers with various neurostructures, allows for speed testing in the entire range. The connection with cloud storage present in the proposed structure leads to the unloading of the management system, allowing to increase the process of analyzing data coming from the object.publishe

The combination of common neuroosteoarthropathy and diabetic dermatopathy in type 2 diabetes mellitus

Diabetic neuroosteoarthropathy (Charcot’s osteoarthropathy, DNAP, Charcot’s foot) is a common complication of diabetic neuropathy, which can be easily diagnosed in clinical practice and usually is corrected without leading to severe deformation of the affected joint in case of timely and adequate treatment. We present the result of long-term clinical observation of a patient with early development of complications of type 2 diabetes mellitus, diabetic dermatopathy, common DNOAP with damage to the joints of the feet, ankles, knees and elbows. A feature of the described clinical case is the prevalence of osteoarticular disorders with seizure of atypical diabetes zones – knee and elbow joints, the defeat of which is more characteristic of other diseases (such as collagenoses and syphilis), as well as a combination of DNOAP with diabetic dermatopathy. It seems that the causes of such a common arthropathic process lie in the long course of diabetic neuropathy, which debuted long before the diagnosis of type 2 diabetes, as well as the development and progression of this patient in the last decade of observing diabetic nephropathy and associated secondary hyperparathyroidism. In the modern literature, descriptions of combinations of dermatopathies with other complications of diabetes mellitus are extremely rare, and references to a combination of common DNAP and diabetic bullosis have not been found

Structure changes in InP and GaAs crystals double irradiated with electrons and swift heavy ions

We have studied InP and GaAs crystal structure changes under the influence of swift Kr and Bi ions irradiation by means of scanning electron microscopy, atomic force microscopy and selective chemical etching. The previous disordering of samples by electron irradiation is shown to be leading to macrodefect formation in the form of cracks and breaks at the depths near the ion end-of-range and on the crystal surface. A possible explanation of the observed effects is proposed.Вивчено вплив змін структури ІnP і GaAs при опроміненні іонами Kr і Bі й електронами при вивченні методом електронної мікроскопії, атомної силової мікроскопії й сективного хімічного травлення. Основними ефектами при цьому впливі були утворення тріщин і руйнувань структури поверхні, які найбільше значно проявлялися наприкінці пробігу іонів і поблизу поверхні. Можливе пояснення виявлених ефектів представлено.Изучено влияние изменений структуры InP- и GaAs- при облучении ионами Kr и Bi и электронами при изучении методом электронной микроскопии, атомной силовой микроскопии и сективного химического травления. Основными эффектами при этом воздействии являлись образование трещин и разрушений структуры поверхности, которые наиболее значительно проявлялись в конце пробега ионов и вблизи поверхности. Возможное объяснение обнаруженных эффектов представлено

Experimental manifestations of the Nb^{4+}-O^{-} polaronic excitons in KTa_{0.988}Nb_{0.012}O_{3}

The formation of the photo-polaronic excitons in ABO_{3} perovskite type oxides has been detected experimentally by means of the photoinduced electron paramagnetic resonance studies of KTa_{0.998}Nb_{0.012}O_{3} crystals. The corresponding microwave X-band spectrum at T < 10 K consists of a narrow, nearly isotropic signal located at g ~ 2 and a strongly anisotropic component. The first signal, which has a rich structure due to hyperfine interactions with the lattice nuclei, is attributed to the single trapped charge carriers: the electrons and/or the holes. The anisotropic spectrum is caused by the axial centers oriented along the C_{4} pseudo-cubic principal crystalline axes. The spectrum angular dependence can be described well by an axial center with S = 1, g_{\parallel) = 0.82, g_{\perp} = 0.52 and D = 0.44 cm^{-1}. The anisotropic spectrum is attributed to the Nb^{4+}-O^{-} polaronic excitons. The temperature dependence of the anisotropic component is characterized by two activation energies: the internal dynamics activation E_{a1} = 3.7\pm0.5 meV, which makes the EPR spectrum unobservable above 10 K, and the destruction energy E_{a2} = 52\pm4 meV. By comparing the anisotropic photo-EPR spectrum and the photoinduced optical absorption temperature dependencies, we found that the Nb^{4+}-O^{-} polaronic excitons also manifested themselves via the ~0.7 eV wide absorption band arising under UV light excitation in the weakly concentrated KTaO_{3}:Nb crystals.Comment: PDF, 15 pages, 6 figures (submitted to Physical review B

Experimental manifestations of the Nb4+-O- polaronic excitons in KTa0.988Nb0.012O3

The formation of the photopolaronic excitons in ABO3 perovskite-type oxides has been detected experimentally by means of the photoinduced electron paramagnetic resonance (EPR) studies of KTa 0.988Nb0.012O3 crystals. The corresponding microwave x-band spectrum at T< 10 K consists of a narrow, nearly isotropic signal located at g ∼ 2 and a strongly anisotropic component. The first signal, which has a rich structure due to hyperfine interactions with the lattice nuclei, is attributed to the single trapped charge carriers: the electrons and/or the holes. The anisotropic spectrum is caused by the axial centers oriented along the C4 pseudocubic principal crystalline axes. The spectrum angular dependence can be described well by an axial center with S = 1, g = 0.82, g = 0.52, and D = 0.44 cm-1. The anisotropic spectrum is attributed to the Nb4+-O- polaronic excitons. The temperature dependence of the anisotropic component is characterized by two activation energies: the internal dynamics activation Ea1 = 3.7 ± 0.5 meV, which makes the EPR spectrum unobservable above 10K, and the destruction energy Ea2 = 52 ± 4 meV. By comparing the anisotropic photo-EPR spectrum and the photoinduced optical absorption temperature dependencies, we found that the Nb4+-O - polaronic excitons also manifested themselves via the wide absorption band at ∼0.7 eV arising under ultraviolet light excitation in the weakly concentrated KTaO3:Nb crystals. © 2011 American Physical Society

Antioxidative vs cytotoxic activities of organotin complexes bearing 2,6-di-tert-butylphenol moieties

Copyright © 2018 John Wiley & Sons, Ltd. Two series of organotin(IV) complexes with Sn–S bonds on the base of 2,6-di-tert-butyl-4-mercaptophenol (L1SH) of formulae Me2Sn(L1S)2 (1); Et2Sn(L1S)2 (2); Bu2Sn(L1S)2 (3); Ph2Sn(L1S)2 (4); (L1)2Sn(L1S)2 (5); Me3Sn(L1S) (6); Ph3Sn(L1S) (7) (L1 = 3,5-di-tert-butyl-4-hydroxyphenyl), together with the new ones [Me3SnCl(L2)] (8), [Me2SnCl2(L2)2] (9) (L2 = 2-(N-3′,5′-di-tert-butyl-4′-hydroxyphenyl)-iminomethylphenol) were used to study their antioxidant and cytotoxic activity. Novel complexes 8, 9 of MenSnCl4 − n (n = 3, 2) with Schiff base were synthesized and characterized by 1H, 13C NMR, IR and elemental analysis. The crystal structures of compounds 8 and 9 were determined by X-ray diffraction analysis. The distorted tetrahedral geometry around the Sn center in the monocrystals of 8 was revealed, the Schiff base is coordinated to the tin(IV) atom by electrostatic interaction and formation of short contact Sn–O 2.805 Å. In the case of complex 9 the distorted octahedron coordination of Sn atom is formed. The antioxidant activity of compounds as radical scavengers and reducing agents was proved spectrophotometrically in tests with stable radical DPPH, reduction of Cu2+ (CUPRAC method) and interaction with superoxide radical-anion. Moreover, compounds have been screened for in vitro cytotoxicity on eight human cancer cell lines. A high activity against all cell lines with IC50 values 60–160 nM was determined for the triphenyltin complex 7, while the introduction of Schiff base decreased the cytotoxicity of the complexes. The influence on mitochondrial potential and mitochondrial permeability for the compounds 8 and 9 has been studied. It is shown that studied complexes depolarize the mitochondria but don't influence the calcium-induced mitochondrial permeability transition

Ischemic Changes in the Mucous Membrane of the Transverse Colon as a Complication of Acute Pancreatitis

Aim: to present a clinical case of a patient with a complicated course of acute pancreatitis.Key points. A 31-year-old patient was admitted to the surgical department with a clinical picture of acute alcoholic pancreatitis. Signs of anemia were regarded as a consequence of gastrointestinal bleeding. Computed tomography with contrast enhancement, along with an increase in the size of the pancreas, the presence of foci of pancreatic necrosis with multiple fluid accumulations in the parapancreatic space, revealed smoothed gaustration and thickening of the walls of the predominantly transverse colon. During colonoscopy, ischemic changes of the colon mucosa were detected in a timely manner. Negative results of analysis for toxins A and B of Clostridioides difficile and pathogenic intestinal flora were obtained. By the means of intensive care, it was possible to achieve complete stabilization of the patient's condition, normalization of laboratory blood parameters and relief of ischemic processes in the colon wall.Conclusion. Ischemic changes of the colon can serve as a complication of acute pancreatitis. A thorough analysis of the results of computed tomography at the first signs of colon lesion and colonoscopy contributed to the rapid detection of complications and prevention of irreversible colon ischemia