Spin dependence of diffractive DIS

I review the recent progress in the theory of s-channel helicity nonconservation (SCHNC) effects in diffractive DIS including the unitarity driven demise of the Burkhardt-Cottingham sum rule and strong scaling departure from the Wandzura-Wilczek relation.Comment: 3 pages, 3 figures, uses npb.sty (attached), a contribution to the Proceedings of DIS'99, April 99, Zeuthen, German

Corrections to the generalized vector dominance due to diffractive rho_3 production

The idea of the vector dominance is still in use in various analyses of experimental data of photon-hadron reactions. It makes sense, therefore, to recast results of microscopic calculations of such reactions in this language. Here we present the diffractive DIS $\rho_3$ production as a specific correction to the generalized vector dominance. We perform a coupled channel analysis of spin-orbital excitations in diffractive photoproduction and reiterate the point that rho_3 in diffractive DIS will be sensitive to a novel aspect of diffraction.Comment: 12 pages, 2 figure

Recycling Option of the Wrong Length Copper Wire

The purpose of the study is to study the possibility of utilizing copper waste from drawing. The experimental testing was carried out with reference to the compacting of segments of copper wire to produce products in the form of bars. The finite element method was used to evaluate the stress-strain state when the raw material compression scheme in the container was realized. It is shown that with the tested treatment modes a high level of strength properties is achieved, but an insufficient level of plastic characteristics. Keywords: Recycling, copper wasters, stress, strain, program complex ABAQUS, finite element method, pressing, extrusio

Comparative Analysis of Various Superconducting and Non-Superconducting Fault Current Limiting Devices Designed for Operation in a 110kV/100 MW Power Network

AbstractAs it is known one of the most promising fault current limiting (FCL) devices for high-power electric networks can be the so-called transformer type superconducting fault current limiter (SFCL) with the primary winding connected to the load in series and the secondary one shortened by a fast-acting circuit-breaker. These devices when made of conventional materials can be very large and expensive – e.g., for a 100 MW circuit under protection the total mass of copper winding conductors can exceed 15 tons and the heat losses in a normal operating mode can be more than 200kW. Therefore, using of high-temperature superconductors (HTSC) can be a solution which can sufficiently improve the mass, geometrical and operational characteristics of an FCL. Unlike other superconducting AC devices, the magnetic field in SFCL does not exceed 0.1 – 0.2 T what allows using HTSC windings even at a comparatively high level of AC losses existing nowadays. In this paper is performed a comparative analysis of various designs of SCFL with the non-superconducting FCL. It has been shown that the former have a mass by an order of magnitude lower than the latter and the rate of lowering of heat losses in a normal operating mode is the same. The equalization of costs of both designs is expected to be reached within the nearest 3 – 5 five years

Coulomb dissociation of a fast pion into two jets

We calculate the electromagnetic contribution to the scattering amplitude of pion diffractive dissociation into di-jets which is described by one photon exchange. The result shows that the factorization procedure known for the description of exclusive reactions holds also for this quasi-exclusive process. We find that the longitudinal momentum distribution of di-jets does not depend on the form of the pion distribution amplitude. We discuss the magnitude of the cross section.Comment: 7 pages, 3 .eps figures, Late

Новый способ открытой репозиции и удержания костных отломков с использованием пластиковых хомутов-стяжек

Background. The quality of fractures reposition in open osteosynthesis is one of the important factors determining the outcome of treatment. Often, the reposition and fixation of bone fragments is not an easy task. The authors propose a method of reposition and temporary fixation of fragments using plastic ty-raps used in electrical work. The aim of the study is to demonstrate the possibilities of new method of intraoperative reposition and fixation of bone fragments using plastic ty-raps. Materials and Methods. Ty-raps were sterilized before the surgery in the modes intended for the preparation of polymer products. After the fragments were dissected, their reposition and fixation are carried out with the help of clamps and bone clamps. At this stage, there is a need for the use of ty-raps, since the bone clamps prevent the plate from laying on the bone. To do this, 3-4 plastic ty-raps were applied to the areas of bone free from bone clamps in the area of the fragments contact. In those places where an intact periosteum and muscles are attached to the fragment, narrow transverse channels in soft tissues are formed with the instrument to wrap the bone with a ty-rap. Then the free end of the ty-rap is passed through its lock and tightened as much as possible. After tightening all the ty-raps, the bone clamps are removed. The applied ty-raps reliably keep the bone fragments from any displacement, even when the segment rotates. A bone plate is placed on the bone surface with tightened ty-raps. Then the plate fixed to the bone with screws. The plate should be placed on the bone without strong pressing, which allows you to remove the ty-raps from under the plate at any stage of osteosynthesis. The ty-raps are removed by cutting them with a scalpel or snacking with wire cutter, then the plate is fixed to the bone with the remaining screws. Conclusion. Ty-raps have many positive properties: they are affordable, cheap, do not lose their mechanical properties after sterilization, allow you to securely hold bone fragments during reposition, X-ray negative. The method has demonstrated convenience and reliability.Актуальность. Качество репозиции отломков при открытом остеосинтезе является одним из важных факторов, определяющих исход лечения. Нередко репозиция и удержание костных отломков представляют собой непростую задачу. Авторами предложен способ репозиции и временного удержания отломков с использованием пластиковых хомутов-стяжек, используемых при электромонтажных работах. Цель продемонстрировать возможности нового способа интраоперационной репозиции и удержания костных отломков при помощи пластиковых хомутов-стяжек. Материал и методы. Хомуты-стяжки перед операцией подвергают стерилизации в режимах, предназначенных для подготовки полимерных изделий. После выделения отломков осуществляют их репозицию и удержание с помощью зажимов и костодержателей. На этом этапе операции возникает потребность в применении хомутов-стяжек, так как костодержатели препятствуют укладке пластины на кость. Для этого на свободные от костодержателей участки кости в области стыковки отломков накладывают 34 пластиковых хомута-стяжки. В тех местах, где к отломку прикрепляются неповрежденная надкостница и мышцы, инструментом формируют узкие поперечные каналы в мягких тканях для обхватывания кости хомутом. Затем свободный конец хомута проводят через его замок и максимально затягивают. После затягивания всех хомутов костодержатели снимают. Наложенные хомуты надежно удерживают костные фрагменты от каких-либо смещений даже при ротации сегмента. Поверх кости с затянутыми хомутами-стяжками укладывают накостный фиксатор. Затем фиксируют пластину к кости винтами. Следует укладывать пластину на кость без сильного прижатия, что позволяет удалять хомуты-стяжки из-под пластины на любом этапе остеосинтеза. Стяжки удаляют, разрезая их скальпелем или перекусывая кусачками, затем пластину закрепляют к кости оставшимися винтами. Заключение. Хомуты-стяжки обладают многими преимуществами: они доступны, дешевы, не теряют своих механических свойств после стерилизации, позволяют надежно удерживать отломки костей во время репозиции, рентгенонегативны. Метод продемонстрировал удобство и надежность

Вопросы эффективности и безопасностиприменения системных ретиноидов в терапии акнеу подростков

The article describes up-to-date data on mechanics of epigenetic effects of system retinoid - isotretinoin (Roaccutane). It is noted, that modern acne therapy is able not only to pathogenetically influence consequences of the process, but effect genetical causes of desease, leading to persistant changes and normalization of regulatory segments DNA structure under influence of isotretinoin. Also this article lists data on the use of isotretinoin (Roaccutane) for acne treatment of 237 adolescents. Studies were performed on frequency of occurrence, degree of manifestation of secondary effects and methods of levereging this effects in practical use. Authors state that correctly prescribed treatments are safe and do not cause serious secondary effects with in case of long treatmetns.Приведены современные данные о механизмах эпигенетического действия системного ретиноида - изотретиноина (роаккутана), а также собственный опыт применения препарата у 237 подростков, страдающих акне. Изучались частота встречаемости, степень выраженности побочных эффектов и методы их нивелирования в практической деятельности. Результаты исследований свидетельствуют о безопасности лечения акне изотретиноином (роаккутаном) при правиль- ном его назначении и отсутствии тяжелых побочных эффектов при длительном применении

Dipole model for double meson production in two-photon interactions at high energies

In this work the double vector meson production in two-photon interactions at high energies is investigated considering saturation physics. We extend the color dipole picture for this process and study the energy and virtuality dependence of the forward differential cross section. Comparison with previous results is presented and the contribution of the different photon polarizations is estimated.Comment: 20 pages, 8 figures, 1 table. Version to be published in European Physical Jornal

Study of hyperfine structure in simple atoms and precision tests of the bound state QED

We consider the most accurate tests of bound state QED, precision theory of simple atoms, related to the hyperfine splitting in light hydrogen-like atoms. We discuss the HFS interval of the 1s state in muonium and positronium and of the 2s state in hydrogen, deuterium and helium-3 ion. We summarize their QED theory and pay attention to involved effects of strong interactions. We also consider recent optical measurements of the 2s HFS interval in hydrogen and deuterium.Comment: presented at The International Workshop "e+e- collisions from phi to psi