Size Effect in Ethylene Oxidation over Silver Nanoparticles Supported on HOPG

A preparation procedure for a model catalyst – stable silver nanoparticles with a narrow size distribution supported on highly oriented pyrolytic graphite (Ag/HOPG) – is presented. This procedure is carried out under ultra high vacuum conditions and consists of three stages: 1 – surface defect formation by soft Ar+-treatment; 2 – silver deposition; 3 – defect annealing by heating at T = 300 °C. The analysis of oxygen forms on a silver surface was carried out by in-situ X-ray photoelectron spectroscopy (XPS). The simultaneous presence of two oxygen species (electrophilic and nucleophilic) on the silver surface was found to be necessary for high activity of the model catalyst in ethylene epoxidation. An alternative explanation of the size effect in ethylene oxidation has been suggested: size dependence of the reaction rate may result from the existence of a ring-shaped zone at the edge of silver particles in which the surface concentration of nucleophilic oxygen is not uniform. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3514

Extraction of Kaon Formfactors from K^- -> mu^- nu_mu gamma Decay at ISTRA+ Setup

The radiative decay K->mu nu gamma has been studied at ISTRA+ setup in a new kinematical region. About 22K events of K^- -> mu^- nu_mu gamma have been observed. The sign and value of Fv-Fa have been measured for the first time. The result is Fv-Fa=0.21(4)(4).Comment: 11 pages, 21 figures, submitted to Phys. Lett.

Control system of electron linac LU-40

The reconstruction of a two-section electron LU-40 linac was finished in 2004. The accelerator consists of two accelerating sections and an injector, the latter includes a diode electron gun, a klystron type buncher and an accelerating cavity. Pulse current at the accelerator exit is up to 200 µA, the beam energy is up to 100 MeV.В 2004 году закончена реконструкция двухсекционного линейного ускорителя электронов ЛУ-40. Ускоритель состоит из двух ускоряющих секций и инжектора, который включает в себя диодную электронную пушку, группирователь и ускоряющий резонатор. Импульсный ток на выходе ускорителя до 200 мА, энергия пучка до 100 МэВ.У 2004 році закінчено реконструкцію двохсекційного лінійного прискорювача електронів ЛП-40. Прискорювач складається з двох прискорюючих секцій та інжектора, який включає до себе діодну електронну гармату, груповач і прискорюючий резонатор. Імпульсний струм на виході прискорювача досягає 200 мА, енергія пучка − 100 МеВ

Control system by the technological electron linac KUT-20

The high-power technological electron linac KUT-20 was developed at the Science Research Complex “Accelerator” of NSC KIPT. The linac consists of two 1.2 m length accelerating structures with a variable geometry and an injector. The latter comprises a diode electron gun, a klystron type buncher and an accelerating cavity. With a RF supply power at accelerating structure entries of 11 MW and with a current at the accelerator exit of 1 A, the beam energy will be up to 20 MeV. An average beam power is planned to be 20 kW [1]. All systems of the accelerator are controlled by a computerised control system. The program & technical complex consist of PC equipped with fast ADC, control console, synchronization unit, microprocessor-operated complexes

Control system in the technological electron linacs

In recent years in the Science Research Complex "Accelerator" in NSC KIPT the power current technological electron linacs are developed and put into operation. Their energy varies from 8 MeV to 30 MeV, the pulse current does not exceed 1A and the operating frequency is 150-300 Hz. The one- section linacs, KUT and LU-10, and two- section linac EPOS are used primarily for technological aims. The technological object zone irradiated by accelerated electrons is created with the magnet scanning syste

S-band electron linac with beam energy of 30…100 MeV

The S-band electron linac has been designed at NSC KIPT to cover an energy range from 30 to 100 MeV. The linac consists of the injector based on evanescent oscillations and the two four-meter long piecewise homogeneous accelerating sections. Each section is supplied with RF power from the KIU-12AM klystron. Variation of mean energy of the beam over a wide range is produced by placing bunches out of the wave crest in the second accelerating section. The report presents layout of the linac as well as simulation results of self-consistent particle dynamics in the linac and its present status.Лінійний прискорювач електронів 10 см - діапазону було розроблено в ННЦ ХФТІ з метою перекрити діапазон енергій 30…100 MeВ. Прискорювач складається з інжектора, основаного на коливаннях, що не розповсюджуються, і двох шматково-однорідних чотириметрових прискорювальних секцій. Кожна секція забезпечується НВЧ-потужністю від клістрона KІУ-12AM. Зміна середньої енергії пучка в широких межах забезпечується прискоренням згустків не на гребені хвилі в другій прискорювальній секції. Представлено структурну схему прискорювача, результати моделювання динаміки частинок в прискорювачі і його поточний стан.Линейный ускоритель электронов 10 см - диапазона был разработан в ННЦ ХФТИ с целью перекрытия диапазона энергий 30…100 MэВ. Ускоритель состоит из инжектора, основанного на не распространяющихся колебаниях и двух кусочно-однородных четырехметровых ускоряющих секций. Каждая секция питается СВЧ-мощностью от клистрона KИУ-12AM. Изменение средней энергии пучка в широких пределах обеспечивается ускорением сгустков не на гребне волны во второй ускоряющей секции. Представлены структурная схема ускорителя, результаты моделирования динамики частиц в ускорителе и его текущее состояние

Electron linacs in NSC KIPT: R&D and application

A review is given about electron linacs of NSC KIPT and their some applications for research of radiation effects in reactor materials, channeling, plasma-beam interactions, geology (gamma-activation analysis of ore samples), as well as sterilization of single-use medical products, modification of polymers and semiconductors, isotope production for nuclear medicine etc

Myo-inositol: micronutrient for “fine tuning” of the female reproductive sphere

Myo-inositol: micronutrient for “fine tuning” of the female reproductive sphere I.Yu. Torshin1, O.A. Gromova1, A.G. Kalacheva2, N.K. Tetruashvili3, V.I. Demidov2 1 Federal Research Center “Computer Science and Control” of the Russian Academy&nbsp; &nbsp;of Sciences, Moscow, Russian Federation 2 Ivanovo State Medical Academy, Ivanovo, Russian Federation 3 V.I. Kulakov Research Center of Obstetrics, Gynecology and Perinatology, Moscow,&nbsp; &nbsp;Russian Federation Myo-inositol is necessary for the synthesis of signal molecules of inositol phosphates involved in effect mediation of reproductive hormones. Insufficiency of myo-inositol is associated with menstrual irregularities, infertility, polycystic ovaries and congenital malformations of the fetus. Myo-inositol supplement improves the formation of ovulatory cycles, mature oocytes, the probability of pregnancy; reduce the risk of folate-resistant malformations, gestational diabetes, and fetal macrosomia. Myo-inositol favorably affects the lipid profile of the blood; prevents excessive weight gain during pregnancy, counteracts the formation of glucose tolerance and insulin resistance in women with menstrual irregularities, reduces chronic inflammation in the atherogenic profile of the blood. Myo-inositol supports antitumor immunity. The level of myo-inositol in the body decreases with the use of nephrotoxic medicinal products. Myo-inositol dependence increases with kidney pathology (pyelonephritis, glomerulonephritis, diabetic nephropathy, nephropathy of pregnancy, renal form of hypertension, etc.), with hyperglycaemic type of nutrition. Key words: myo-inositol, ovulation, hormonal receptors, polycystic ovary, folate-resistant developmental defects, Miofert. For citation: Torshin I.Yu., Gromova O.A., Kalacheva A.G. et al. Myo-inositol: micronutrient for “fine tuning” of the female reproductive sphere. Russian Journal of Woman and Child Health. 2018;1(2):148–155.<br