Ways to Enhance Environmental Flat Grinding by Improving the Technology of the Coolant Supply

AbstractThe present article includes the analysis of coolant supplying for flat grinding with the grinding wheel face; we discuss questions, related to development of combined methods of coolant supplying. Article presents the method and theoretical justification of forming the coolant bath in the working area of the flat grinding machine. Article also includes justification of the new coolant function – recovering. This function involves grinding waste neutralizing in the cutting area, and is evaluated by limiting concentration of the harmful substances in the machine working area

THE STRUCTURE OF MUSCULAR ACTMTY IN CYCLIC LOCOMOTIONS

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Today and Future Neutrino Experiments at Krasnoyarsk Nuclear Reactor

The results of undergoing experiments and new experiment propositions at Krasnoyarsk underground nuclear reactor are presentedComment: 4 page

Vortex loops entry into type--II superconductors

The magnetic field distribution, the magnetic flux, and the free energy of an Abrikosov vortex loop near a flat surface of type--II superconductors are calculated in the London approximation. The shape of such a vortex line is a semicircle of arbitrary radius. The interaction of the vortex half--ring and an external homogeneous magnetic field applied along the surface is studied. The magnitude of the energy barrier against the vortex expansion into superconductor is found. The possibilities of formation of an equilibrium vortex line determined by the structure of the applied magnetic field by creating the expanding vortex loops near the surface of type--II superconductor are discussed.Comment: LaTeX file ( 22 pages & 7 figures ); the required TeX style file "bezier.sty" is attached; accepted for publication in Physica

Closed Abrikosov Vortices in a Superconducting Cylinder

The new type of solutions of the London equation for type-II superconductors is obtained to describe the ring-shaped (toroidal) Abrikosov vortices. The specific feature of these solutions is the self-consistent localization of both the supercurrent and the magnetic field, enabling one to construct compact magnetic structures inside a superconductor. The torus vortex contraction caused by the vortex instability leads to the destruction of the Cooper pairing and the formation of a normal electron stream in the vicinity of the torus axis. The thermodynamic condition for the excitation of a small closed vortex by a bunch of charged particles contains the fine-structure constant as a determining parameter.Comment: LaTex using revtex, 12 pages. 5 Figures available upon request from [email protected] Accepted for publication in Physica

КОРРЕЛЯЦИОННАЯ ЗАВИСИМОСТЬ КЛИНИКО-МОРФОЛОГИЧЕСКИХ ПРОЯВЛЕНИЙ И БИОМЕХАНИЧЕСКИХ ПАРАМЕТРОВ У БОЛЬНЫХ С ДЕГЕНЕРАТИВНЫМ СПОНДИЛОЛИСТЕЗОМ L4 ПОЗВОНКА

The study included 59 operated patients with spondylolisthesis L4 vertebra of I degree. All the patients were held clinical-anamnestic, neurological, radiological, radiopaque and biomechanical studies, MRI, CT, as well as puncture performed provocative tests. Revealed correlation of clinical manifestations of degenerative spondylolisthesis L4 and biomechanical parameters of the shape and orientation of the lumbar spine. The most pronounced clinical and morphological changes detected at the level of spondylolisthesis and adjacent segments in the group with hyperlordosis and excessive tilt angle of the chord forward, which is confirmed by MRI, CT, and carried out a disco-puncture provocative tests. A variety of pathological changes of the lumbar spine at L4 vertebra degenerative spondylolisthesis correlated with the biomechanical parameters violation of the shape and orientation of the spine in the sagittal plane.В исследование включено 59 пациентов, оперированных по поводу спондилолистеза L4 позвонка I степени. Всем больным были проведены клинико-анамнестическое, неврологическое, рентгенологическое, рентгенконтрастное и биомеханическое исследования, МРТ, МСКТ, а также выполнены пункционных провокационных проб. Выявлена корреляционная зависимость клинических проявлений дегенеративного спондилолистеза L4 и биомеханических параметров формы и ориентации поясничного отдела позвоночника. Наиболее выраженные клинико-морфологические изменения выявлены на уровне спондилолистеза и смежных сегментов в группе с гиперлордозом и избыточным наклоном угла хорды вперед, что подтверждается данными МРТ, МСКТ и проведенными диско-пункционными провокационными тестами. Разнообразие патоморфологических изменений поясничного отдела позвоночника при дегенеративном спондилолистезе L4 позвонка коррелирует с нарушением биомеханических параметров формы и ориентации позвоночника в сагиттальной плоскости

Unconventional state with two coexisting long-range orders for frustrated Heisenberg model at quantum phase transition

For the frustrated two-dimensional $S=1/2$ antiferromagnetic Heisenberg model close to quantum phase transition we consider the singlet ground states retaining both translational and SU(2) symmetry. Besides usually discussed checkerboard, spin-liquid and stripe states an unconventional state with two coexisting long-range orders appears to be possible at sufficiently large damping of spin excitations. The problem is treated in the frames of self-consistent spherically symmetric approach.Comment: 11 pages, 5 figure

The RF system for RFQ-injector of LINAC-20

The RF system of RFQ-injector being built in ITEP is presented. Two-channel RF system of RFQ-injector operates at 145 MHz in pulse mode. Parameters and test results of the channels operated on the dummy load are presented. The pulse output power of 400 kW was reached.Представлена система ВЧ-живлення прискорювача-інжектора з ПОКФ, який розробляється в ІТЕФ і призначений для заміни електростатичного форінжектора установки ЛУ-20. Система ВЧ-живлення працює на частоті 145 МГц і складається з двох підсилюючих каналів для порушення прискорюючої структури і банчера. Наводяться параметри і результати високочастотних випробувань підсилюючих каналів при роботі на еквівалент навантаження. Канал збудження структури з ПОКФ забезпечує вихідну потужність 400 кВт в імпульсі.Представлена система ВЧ-питания ускорителя-инжектора с ПОКФ, разрабатываемого в ИТЭФ и предназначенного для замены электростатического форинжектора установки ЛУ-20. Система ВЧ-питания работает на частоте 145 МГц и состоит из двух усилительных каналов для возбуждения ускоряющей структуры и банчера. Приводятся параметры и результаты высокочастотных испытаний усилительных каналов при работе на эквивалент нагрузки. Канал возбуждения структуры с ПОКФ обеспечивает выходную мощность 400 кВт в импульсе

The last integrable case of kozlov-Treshchev Birkhoff integrable potentials

We establish the integrability of the last open case in the Kozlov-Treshchev classification of Birkhoff integrable Hamiltonian systems. The technique used is a modification of the so called quadratic Lax pair for $D_n$ Toda lattice combined with a method used by M. Ranada in proving the integrability of the Sklyanin case.Comment: 13 page