Thermal regimes of HTS cylinders operating in devices for fault current limitation

We reveal obstacles related to the application of HTS cylinders in current limiting devices based on the superconducting - normal state transition. It is shown that, at the critical current density achieved presently in bulk materials, and especially in BSCCO-2212, the required thickness of the cylinder wall in a full-scale inductive device achieves several centimeters. A simple mathematical model of the operation of an inductive fault current limiter (FCL) is used to show that such cylinders cannot be cooled in admissible time after a fault clearing and, hence, the inductive FCLs and current-limiting transformers employing BSCCO cylinders do not return to the normal operation in the time required. For the recovery even with a non-current pause in the circuit, the cylinders are needed with the critical current density by an order higher than the existed ones.Comment: 15 pages, 5 figure

Signatures of Molecular Unification and Progressive Oxidation Unfold in Dissolved Organic Matter of the Ob-Irtysh River System along Its Path to the Arctic Ocean

The Ob-Irtysh River system is the seventh-longest one in the world. Unlike the other Great Siberian rivers, it is only slightly impacted by the continuous permafrost in its low flow. Instead, it drains the Great Vasyugan mire, which is the world largest swamp, and receives huge load of the Irtysh waters which drain the populated lowlands of the East Siberian Plain. The central challenge of this paper is to understand the processes responsible for molecular transformations of natural organic matter (NOM) in the Ob-Irtysh river system along the South-North transect. For solving this task, the NOM was isolated from the water samples collected along the 3,000?km transect using solid-phase extraction. The NOM samples were further analyzed using high resolution mass spectrometry and optical spectroscopy. The obtained results have shown a distinct trend both in molecular composition and diversity of the NOM along the South-North transect: the largest diversity was observed in the Southern “swamp-wetland” stations. The samples were dominated with humic and lignin-like components, and enriched with aminosugars. After the Irtysh confluence, the molecular nature of NOM has changed drastically: it became much more oxidized and enriched with heterocyclic N-containing compounds. These molecular features are very different from the aliphatics-rich permafrost NOM. They witnesses much more conservative nature of the NOM discharged into the Arctic by the Ob-Irtysh river system. In general, drastic reduction in molecular diversity was observed in the northern stations located in the lower Ob flow

Perspectives of periodontal diseases treatment and teeth hypersensivitycorrection by means of diode sirolaser therapy

The analyze of the result of the complex treatment of periodontal diseases with including diode Sirolaser therapy based on the objective researching estimating of hygienic and periodontal indices let us to speak about the efficiency of this method. During the using diode laser therapy the reducing processes inside the periodont have been proceeded for the three months of observation. The application of diode laser method in periodontology has allowed to reach such results in shorter term and to diminish to minimum the gum inflammation and negative subjective patient’s sensations. After diode laser therapy tooth hypersensivity has decreased for 6 months observation in examined group. In control group negative subjective patient’s sensations were still staying in 33 % cases.Результаты комплексного лечения заболеваний пародонта с использованием диодной лазеротерапии свидетельствуют об эффективности методики, что доказано данными объективного исследования, цитоморфологического исследования и индексной оценкой. Применение лазеротерапии позволяет на этапе консервативного лечения добиться ремиссии за короткий промежуток времени. Простота, безболезненность метода, быстрое устранение видимых патологических изменений в области десны, уменьшение гиперэстезии зубов привлекает пациентов. Повышенная чувствительность зубов достоверно уменьшилась на протяжении 6 месяцев наблюдения

DEVELOPMENT OF CARBIDE AND NITRIDE CERAMICS OF INCREASED RESISTIBILITY

The developments of carbide and nitrite ceramics of high solidity are presented. It is shown that development of nanotechnology led to creation of thenanostructural ceramics, the composition of which is controlled on cluster level

The maintenance of education to computer science at the basic school: on the way to fundamentalization

In article the approach to formation of the maintenance of a school course of the computer science, based on use of backbone concept «information processes» is described. The approach is realized in the textbook of computer science for 8 classes of high school

MODIFYING OF FOUNDRY STEELS BY NANOCOVERING OF STEEL SHOT

The technology of coatings deposition with thickness up to 5 micrometers on the activated surface of steel shot is developed. The composition and arrangements of layers in covering of the steel shot intended for modification of steel are chosen

PRODUCTION OF POROUS POWDER MATERIALS OF SPHERICAL POWDERS OF CORROSION-RESISTANT STEEL

Production of porous powder materials from spherical powders of corrosion-resistant steel 12Х18н10Т with formation at low pressures 120–140 mpa in the mold with the subsequent activated sintering became possible due to increase of duration of process of spattering and formation of condensate particles (Si–C) or (Mo–Si) on surface

MRI IN THE ASSESSMENT OF TUMOR RESPONSE TO CHEMORADIOTHERAPY IN PATIENTS WITH LOCALLY ADVANCED CERVICAL CANCER

Objective: to evaluate the ability of high-field MRI to assess tumor response to chemoradiotherapy in patients with locally advanced cervical cancer. Material and methods. The study involved 43 patients. MRI was performed using a 1.5 Tesla MAGNETOM ESSENZA scanner (SIEMENS, Germany) with a magnetic field strength of 1.5 T. Intravenous bolus injection of paramagnetic contrast agent was used to assess the tumor spread and determine the tumor boundaries and its structure. Dynamic series of sections and delayed scans in standard T1-weighted sequence were obtained. Results. Dynamic contrast-enhanced MRI was shown to be a highly informative method that can be used to monitor the process of combined chemotherapy and radiation therapy in the treatment of patients with cervical cancer. It permits the objective assessment of the dynamics of tumor regression, changes in tumor vascularity and regional lymph node status