Fluoride technology of obtaining REM magnetic alloys and master alloys

Rare earth permanent magnets (REPM) based on neodymium-Fe-boron system are the most promising, since they have the highest magnetic and satisfactory mechanical characteristics. The paper covers physical-chemical principles and shows the results of experimental studies of the process of obtaining REM alloys and master alloys using fundamentally new fluoride technology based on ladle calciothermal REM fluorides and Fe reduction

Basic stages of magnet production by fluoride technology

This paper presents the results of development of ecological low-waste “dry” fluoride technology of magnetic material production on the basis of rare-earth metals of the Nd-Fe-B-system. The physicochemical fundamentals are stated and the basic stages of the proposed technology are experimentally examined: the fluorination of raw material with elemental fluorine, the production of compact ingot alloys and addition alloys by the calcium-thermal out-of-furnace reduction of fluorides, the production of magnets with the help of the powder metallurgy method using mechanical or hydride grinding, as well as waste processing.</jats:p

Mathematical model of desublimation process of volatile metal fluorides

Mathematical model for calculation of optimal temperature desublimation in metal fluorides and the number of desublimation stages has been developed; it permits achieving the degree of base product recovery from gas-vapour mixture nearly to 100 %. Experimental checking of modeling results at uranium hexafluoride desublimation shows a good correlation with the theoretical data

ЕКСПЕРИМЕНТАЛЬНЕ ПОРІВНЯННЯ МЕТОДІВ ВІДМІННОЇ ФАЗИ ТА МЕТОДІВ ДИНАМІЧНОГО ФОКУСУВАННЯ У ВИЗНАЧЕННІ ПАРАМЕТРІВ БРУТАЛЬНОСТІ ПОВЕРХНІ.

In this work you can find information about differential-phase method and method of autofocusing, which are used on differential-phase laser scanning profilograph-profilometer (DFLSPP) and microscope «MICROSCAN» correspondently. Also is considered experimental comparison of defining of 3D micro- and nano-geometrical surface conditions and standardized roughness parameters of surface with the help of those methods.В этой статье предлагается информация о методе отличной фазы и метод с автоматической фокусировкой, которые используются на лазере отличной фазы, кто рассматривает профилограф-профилометр (ДЕДАЛ ЛСПП) и микроскоп «MICROSCAN» соответствующим образом.Также считается экспериментальным сравнения определения трехмерных микро- и наногеометричних поверхностных условий и стандартизированны епараметры грубости поверхности с помощью таких методов.У цій статті пропонується інформація про метод відмінної фази і метод з автоматичним фокусуванням, які використовуються на лазері відмінної фази, хто розглядає профілограф-профілометр (ДЕДАЛ-ЛСПП) і мікроскоп «MICROSCAN» відповідним чином. Також вважається експериментальним порівняння визначення тривимірних мікро- і наногеометричних поверхневих умов і стандартизовані параметри брутальності поверхні за допомогою таких методів

Mathematical model of determining heat condition in desublimation process of volatile metal fluorides

To optimize the technological parameters of the process and to create the automatic regulation system of desublimation process the mathematical model for desublimation process of volatile metal fluorides in surface devices (by the example of uranium hexafluoride) has been developed. Optimal conditions for desublimation process designed with the use of the model developed were tested and showed good agreement with the experimental data

The origin of elevated levels of circulating DNA in blood plasma of premature neonates

The relationship between the concentration of cell-free DNA (cfDNA) and the number of proliferating/apoptotic lymphocytes in peripheral blood of premature newborns of different gestation age and full-term newborns was determined. The experiments were performed using fluorescent spectrophotometry (with Hoechst 33342), flow cytometry, and microscopy (Feulgen staining of lymphocytes). It was determined that the lymphocyte population of premature newborns may consist of 4.6% of proliferating and 22.1% apoptotic cells. For full-term newborns, the percentage was 2.5% and 2.9%, respectively. A direct correlation between the concentration of extracellular DNA and the number of proliferating lymphocytes of full-term newborns was ascertained (r = 0.400; P < 0.05). For premature newborns, the concentration of extracellular DNA correlated both with proliferating lymphocytes and apoptotic cells. The results show that premature birth causes the induction in lymphocytes of both apoptosis and proliferation that are accompanied by an increased extracellular DNA concentration in the blood of newborn babies. © 2008 New York Academy of Sciences