Complex research of acoustic impact on gas-dust flow in vortex-acoustic dispenser

Introduction The processing of wastes from mining operations is usually related to the needs of related industries in raw materials. The results of numerous studies on the complex processing of various man-made materials have confirmed the feasibility of their use to ensure resource-saving and obtain new types of products [1-3]. One of the most promising areas of industrial waste utilization is their integrated use in the production of building materials, which allows to meet the demand for raw materials up to 40% for this most important industry. The use of industrial waste allows to reduce costs for the manufacture of building materials 10-30% in comparison with their production from natural raw materials. The saving of capital investments makes 35-50% in this case [4-5]. In modern technology of building materials production, fine powders are one of the fundamental components that significantly affect the quality of finished products [6]. The fineness of material grinding is important for the intensification of various technological processes. However, the obtaining of a highly dispersed product is difficult due to increased energy consumption for material grinding, as well as their abrasiveness at an intensive abrasion, which causes a high wear of grinding bodies and other parts of a grinding unit. This leads to the increase of the grinding process cost, as well as to the obtaining of a poor-quality, contaminated product [7,8]. According to the data [9-10], the energy costs for the grinding of various materials reach 20% of the total energy consumption for production. The most promising method for fine and ultrafine grinding of various materials used in lowtonnage and innovative technologies is the jet method of grinding [11-12]

Features of neurologic semiology in patients with Chiari malformation I type

The article is devoted to the analysis ot neurologic semiology of 54 patients with malformation Chiari I type at its association with syringomyelia and without. At similar anatomic changes at craniovertebral junction the symptomatology in two subgroups was various. In particular, at associated form there were noted prevalence of the latent disease course, a triad of complaints of patients on a headache, dizziness, vertebral pains; the objective semiology presented by coordination, cerebellar and bulbar disorders, and also oculomotorius; the increase of specific density of motor pyramidal disorders and of sensitivity, including unilateral, and hypesthesia; and also part of patients with cerebellar tonsils dystopia on 6-15 mm below foramen magnum.Статья посвящена анализу неврологической симптоматики 54 больных с мальформацией Киари 1 -го типа при её сочетании с сирингомиелией и без таковой. При схожих анатомических изменениях на уровне краниовертебрального перехода симптоматика в двух подгруппах была различной. При сочетанной форме отмечено преобладание латентной формы заболевания, триады жалоб больных на головную боль, головокружение, боли по ходу позвоночника; объективной симптоматики, представленной координаторно-мозжечковыми и бульбарными расстройствами, глазодвигательными нарушениями, увеличением удельного веса двигательных пирамидных расстройств и расстройств чувствительности, в том числе односторонних, и гипестезии; а также доли пациентов с эктопией миндалин мозжечка на величину 6-15 мм ниже уровня большого затылочного отверстия

Investigation of the properties of quantum-dimensional semiconductor particles A3B5 by scanning probe microscopy, obtained by liquid chemical etching

The study was carried out with the financial support of the Russian Foundation for Basic Research in the framework of scientific projects 17-07-00407-а and 17-07-00139

Multiplicative slices, relativistic Toda and shifted quantum affine algebras

We introduce the shifted quantum affine algebras. They map homomorphically into the quantized $K$-theoretic Coulomb branches of $3d\ {\mathcal N}=4$ SUSY quiver gauge theories. In type $A$, they are endowed with a coproduct, and they act on the equivariant $K$-theory of parabolic Laumon spaces. In type $A_1$, they are closely related to the open relativistic quantum Toda lattice of type $A$.Comment: 125 pages. v2: references updated; in section 11 the third local Lax matrix is introduced. v3: references updated. v4=v5: 131 pages, minor corrections, table of contents added, Conjecture 10.25 is now replaced by Theorem 10.25 (whose proof is based on the shuffle approach and is presented in a new Appendix). v6: Final version as published, references updated, footnote 4 adde

Subsurface disorder and electro-optical properties of proton-exchanged LiNbO3 waveguides produced by different techniques

It has been established, that proton-exchanged LiNbO3 waveguides have a marked subsurface layer with structural disorder inducing degradation of electro-optical properties of these waveguides. At the same time, such a subsurface disorder is found to be less pronounced in soft proton-exchanged (SPE) waveguides in comparison with annealed proton-exchanged (APE) ones. The experimental samples of phase modulators fabricated by SPE technique exhibit a better electro-optical efficiency compared to the LiNbO3 modulators produced by the standard and improved APE techniques

Fermionic formulas for eigenfunctions of the difference Toda Hamiltonian

We use the Whittaker vectors and the Drinfeld Casimir element to show that eigenfunctions of the difference Toda Hamiltonian can be expressed via fermionic formulas. Motivated by the combinatorics of the fermionic formulas we use the representation theory of the quantum groups to prove a number of identities for the coefficients of the eigenfunctions.Comment: 33 pages, Late

Alleviating the non-ultralocality of coset sigma models through a generalized Faddeev-Reshetikhin procedure

The Faddeev-Reshetikhin procedure corresponds to a removal of the non-ultralocality of the classical SU(2) principal chiral model. It is realized by defining another field theory, which has the same Lax pair and equations of motion but a different Poisson structure and Hamiltonian. Following earlier work of M. Semenov-Tian-Shansky and A. Sevostyanov, we show how it is possible to alleviate in a similar way the non-ultralocality of symmetric space sigma models. The equivalence of the equations of motion holds only at the level of the Pohlmeyer reduction of these models, which corresponds to symmetric space sine-Gordon models. This work therefore shows indirectly that symmetric space sine-Gordon models, defined by a gauged Wess-Zumino-Witten action with an integrable potential, have a mild non-ultralocality. The first step needed to construct an integrable discretization of these models is performed by determining the discrete analogue of the Poisson algebra of their Lax matrices.Comment: 31 pages; v2: minor change

Комплексное использование перфузионных технологий при трансплантации почек от донора с внегоспитальной остановкой кровообращения (клинический случай)

Objective: to present the successful experience with a donor with out-of-hospital cardiac arrest (OHCA) in whom a set of modern perfusion techniques was used to obtain kidneys suitable for transplantation.Materials and methods. Automatic chest compression was resumed in an OHCA donor (after biological death has been confirmed in the hospital) to maintain minimal perfusion under mechanical ventilation with 100% FiO2. With femoral vein cannulation, an extracorporeal circuit with a centrifuge pump and oxygenator was connected and abdominal normothermic regional perfusion was initiated. After 215 minutes, kidney was explanted under normothermic machine perfusion. Next, the left kidney was placed in the LifePort Kidney Transporter for hypothermic machine perfusion of donor kidneys. Perfusion time was 285 minutes. The right kidney was transplanted without additional ex-vivo perfusion.Results. Due to the complex use of perfusion techniques both in the donor body and ex-vivo, donor kidneys, after OHCA, with a total warm ischemia time of 110 minutes, were transplanted to recipients with good results. In the postoperative period, there was delayed function of the left and right renal grafts. The patients were discharged in a satisfactory condition under outpatient follow-up.Conclusion. The possibility and efficiency of organ donation after OHCA, facilitated by modern perfusion techniques and devices, open up a new perspective in addressing the organ shortage crisis.Цель: представить успешный опыт работы с донором с внегоспитальной остановкой кровообращения, у которого использовался комплекс современных перфузионных технологий, направленных на получение почек, пригодных для трансплантации.Материалы и методы. У донора с внегоспитальной остановкой кровообращения после констатации биологической смерти в стационаре возобновлена автоматическая компрессия грудной клетки для поддержания минимальной перфузии в условиях искусственной вентиляции легких c FiO2 100%. Путем канюляции бедренных сосудов подключен экстракорпоральный контур с центрифужным насосом и оксигенатором и начата нормотермическая перфузия абдоминальных органов. По истечении 215 минут в условиях нормотермической перфузии выполнена эксплантация почек. Далее левая почка помещена в устройство для гипотермической перфузии донорских почек LifePort, время перфузии составило 285 минут. Правая почка пересажена без дополнительной перфузии ex vivo. Результаты. Благодаря комплексному использованию перфузионных технологий как в организме донора, так и ex vivo почки донора после внегоспитальной остановки кровообращения с общим временем тепловой ишемии 110 минут были пересажены реципиентам с хорошими результатами. В послеоперационном периоде отмечалась отсроченная функция левого и правого почечного трансплантатов. Пациенты выписаны в удовлетворительном состоянии под амбулаторное наблюдение.Заключение. Возможность и эффективность донорства органов после внегоспитальной остановки кровообращения, обеспечиваемого современными перфузионными технологиями и устройствами, открывает новую перспективу в решении дефицита донорских органов для трансплантации.