Utilization methods of bleaching clay

У даній статті розглянуто проблеми пов’язані з утилізацією відбільних замаслених глин, їх відновленням, використанням, захороненням та інше. Проведено аналіз існуючих методів утилізації, та запропонована їх утилізація шляхом спалювання. За допомогою лабораторної установки була визначена швидкість вигорання олії з фільтрувальної глини, що залежить від температури в печі та розміру частинок. Запропонована утилізаційна схема з використанням обертової печі. Наведені результати досліджень зі спалювання замаслених глин, математичного моделювання циклона-осаджувача – результати розрахунків по математичній моделі з полями концентрації, швидкостей та температур.This article describes the problems associated with utilization of oily bleaching clays, their restoration, use, disposal and more. The analysis of existing methods of utilization was held, and offered their utilization by incineration. Using laboratory settings has been determined speed burning oil from bleaching clay, depending on the temperature in the furnace and particle size. Utilization scheme was proposed using the rotary kiln. The results of studies of burning oily clay, mathematical modeling of cyclone – results of calculations on mathematical models of fields of concentration, velocity and temperature.В данной статье рассмотрены проблемы, которые связаны с утилизацией отбеливающих замасленных глин, их восстановление, использование, захоронение и др. Проведен анализ существующих методов утилизации, предложена их утилизация путем сжигания. С помощью лабораторной установки была определена скорость выгорания масла из фильтрующей глины, которая зависит от температуры в печи та размера частичек. Предложена утилизационная схема с использованием вращающейся печи. Приведены результаты исследований по сжиганию замасленных глин, математического моделирования циклона-осадителя – результаты расчетов по математической модели с полями концентраций, скоростей и температур

Quality factor of magnetostatic oscillations in (111)-YIG films

The paper presents results of theoretical study of the intrinsic quality factor for various types of magnetostatic oscillations in ferrite film resonators. The limits of variation of the Q-factor are investigated in the frequency range allowing for existence of the respective oscillation modes depending on the magnetization field

Functional results of surgical reconstruction of the anterior cruciate ligament of the knee joint in combination with lateral stabilization

The objective was to compare the effectiveness of isolated anatomical antegrade reconstruction of the anterior cruciate ligament (ACL) with bonetendon-bone autograft (BTB autograft) and in combination with lateral extra-articular tenodesis (LEAT) graft from the iliotibial tract (ITT).Material and methods. We analyzed 187 arthroscopic ACL reconstructions in patients with a Pivot shift test – 3+ degree. We performed an isolated ACL-R in 118 (63.1 %) patients in group 1 and added the LEAT from ITB to it in group 2.Results. According to IKDC-2000: 176 (94.1 %) patients were included in categories A and B, 11 (5.9 %) – in C. Significant differences in these groups appeared 15 months after the operation. According to KOSS: in group 2, the anterior and rotational knee stability, as well as the level of sports activity were higher, and pathological symptoms were less common.Conclusion. LEAT from ITB increases stability and functionality of the knee joint in patients with anatomical antegrade ACL reconstructions with BTB-autograft for terms over 15 months after the operation, and is an economically procedure

PVDF/poly(3-methylthiophene)/MWCNT nanocomposites for EMI shielding in the microwave range

This work presents a new approach to enhance EMI shielding efficiency of nanocomposites of dielectric polymers, multiwalled carbon nanotubes (MWCNTs) and intrinsically conducting polymers for account of using core-shell morphology for conducting components. To realize this approach new ternary nanocomposites of poly(vinylidene fluoride) (PVDF), MWCNTs and poly(3-methylthiophene) doped by Cl− anions (P3MT) were prepared through synthesis of thermally stable core/shell nanocomposites PVDF/P3MT and MWCNT/P3MT. These binary nanocomposites were mixed with pure MWCNTs or PVDF followed by compression molding to prepare the ternary nanocomposites of different morphology to discriminate their EMI shielding properties in a wide frequency range (1–67 GHz). Values of the tangent of dielectric loss angle, the efficiency of transmission, reflection and absorption of microwave radiation, and shielding efficiency (SE) of the specified materials were found from analysis of spectral dependences of their complex dielectric constants. It was shown that while the melt mixing of the binary PVDF/P3MT nanocomposite with MWCNTs both in a pure state and in the binary nanocomposite (MWCNT/P3MT) expectedly strongly enhances SE of the former, this effect is non-linear and depends on presence/absence of the P3MT shell on the MWCNT core. The ternary nanocomposite PVDF/P3MT/MWCNT made of the binary polymer-polymer nanocomposite PVDF/P3MT and pure MWCNTs showed highest SE values at the frequencies above 4.5 GHz up to 68.4 dB at 67 GHz in the case of the 1 mm thickness sample. However, below 4.5 GHz the SE was higher in the case of the ternary nanocomposites containing core/shell MWCNT/P3MT nanocomposite instead of pure MWCNT

Content and balance of trace elements in placenta on different stages of gestation

Functional status of placenta, which provides nutrients to the fetus, plays an important role in miscarriage. The aim to investigate content and balance of trace elements (Fe, Cu, Co, Zn, Mg, Mn) in placenta in different terms of gestation. Materials and methods. We studied content and balance of essential trace elements (Fe, Cu, Co, Zn, Mg, Mn) in placenta of 52 women which born babies in different terms of gestation. The content of micronutrients studied using atomic absorption spectrophotometer C-115 MI. Results. We established average content and ratio of essential trace elements in placenta of women which born babies on 24-28, 29-31, 32-36 and 37-41 week of gestation. Conclusions. Intensive processes of accumulation and transport of essential trace elements took place in placenta during gestation. It was noted that the content of Fe, Cu and Zn was increased during gestation process and reached maximum level on 29-31 week of gestation. Mn content reached maximum level on 32-36 weeks. Indicators of Co in placenta gradually increased from 24-28 week of gestation and Mg level by contrast reduced. In addition, we investigated the ratio of essential trace elements in placenta, which showed that in pairs Fe/Co, Cu/Co, Zn/Mn and Mg/Mn we observed a significant decreasing of indicators (p<0.05) from 24 to 36 week of gestation, and in pairs Fe/Mg, Cu/Zn, Cu/Mg and Co/Mg - significant increasing of indicators during gestational process. Also we found a positive correlation between Cu and Mn (rxy=0.5732, p<0.05) at 24-28 weeks of gestation, Mg and Mn (rxy=0.5855, p<0.05) on 32-36 weeks, Mg and Mn on 29-31 weeks (rxy=0.8272, p<0.01) and Zn and Mn on 32-36 week of gestation (rxy=0.8097, p<0.05). So, features of transport and deposition of essential trace elements require further research

Electromagnetic Properties of Carbon Nanotube/BaFe12&minus;xGaxO19/Epoxy Composites with Random and Oriented Filler Distributions

The microwave properties of epoxy composites filled with 30 wt.% of BaFe12&ndash;xGaxO19 (0.1 &le; x &le; 1.2) and with 1 wt.% of multi-walled carbon nanotubes (CNTs) were investigated in the frequency range 36&ndash;55 GHz. A sufficient increase in the microwave shielding efficiency was found for ternary 1 wt.%CNT/30 wt.% BaFe12&ndash;xGaxO19/epoxy composites compared with binary 1% CNT/epoxy and 30 wt.% BaFe12&ndash;xGaxO19/epoxy due to the complementary contributions of dielectric and magnetic losses. Thus, the addition of only 1 wt.% of CNTs along with 30 wt.% of barium hexaferrite into epoxy resin increased the frequency range where electromagnetic radiation is intensely attenuated. A correlation between the cation Ga3+ concentration in the BaFe12&ndash;xGaxO19 filler and amplitude&ndash;frequency characteristics of the natural ferromagnetic resonance (NFMR) in 1 wt.%CNT/30 wt.% BaFe12&ndash;xGaxO19/epoxy composites was determined. Higher values of the resonance frequency fres (51.8&ndash;52.4 GHz) and weaker dependence of fres on the Ga3+ concentration were observed compared with pressed polycrystalline BaFe12&ndash;xGaxO19 (fres = 49.6&ndash;50.4 GHz). An increase in the NFMR amplitude on the applied magnetic field for both random and aligned 1 wt.% CNT/30 wt.% BaFe12&ndash;xGaxO19/epoxy composites was found. The frequency of NFMR was approximately constant in the range of the applied magnetic field, H = 0&ndash;5 kOe, for the random 1 wt.% CNT/30 wt.% BaFe12&ndash;xGaxO19/epoxy composite, and it slightly increased for the aligned 1 wt.% CNT/30 wt.% BaFe12&ndash;xGaxO19/epoxy composite

Method of surgical treatment of the central hernias of an intervertebral disk on a lumbar level

In given article the new method of treatment of the central hernias of a lumbar level of a backbone in comparison with other methods forward and back decompression spinal canal is described. Indications and contrindications to the specified method, advantages and lacks of existing methods of treatment of stenoses vertebral channel