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Aleksandr A. Seregin,Sergei L. Nikitchenko,Valentin N. Kurochkin,Nikolay V. Valuev,Sergei V. Smykov 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.8
The article shows the relevance of the availability of mobile service tools for maintenance of machines in the conditions of agricultural enterprises. The main purpose of the work is to simulate, test and describe the application conditions of the hinged unit for maintenance of machines. Improvement of maintenance units should be carried out in the direction of improving their environmental safety and reducing costs. The authors offer a small-sized maintenance aggregate, substantiate its functionality, hinged type of execution, the layout algorithm and the condition of economic feasibility of purchasing this service unit by the enterprise. The test results of the experimental unit prove that it satisfies the requirements of safety and ergonomics, while the laboriousness of service works does not exceed the current normative values. Technical and economic calculation shows a reduction in the cost of service operations relative to serial analogues and the expediency of using the aggregate in the conditions of agricultural enterprises of all organizational forms.
Submucosal Tunneling Muscle Biopsy for Esophageal Motility Disorders: A Case Report
Aleksandr A. Smirnov,Maya M. Kiriltseva,Aleksandr N. Burakov,Maksim V. Maksimov,Anna V. Botina,Marina M. Saadulaeva,Nadezda V. Konkina 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.3
Submucosal tunneling endoscopic technique can be useful in obtaining esophageal muscle specimens in patients with esophagealmotility disorders. Here, we describe the case of a patient with systemic sclerosis. Histological verification of the esophageal involvementin the pathological process was required for the treatment. There were no intra- and post- operational complications.
Tuning of the Interparticle interactions in ultrafine ferrihydrite nanoparticles
Knyazev, Yuriy V.,Balaev, Dmitry A.,Yaroslavtsev, Roman N.,Krasikov, Aleksandr A.,Velikanov, Dmitry A.,Mikhlin, Yuriy L.,Volochaev, Mikhail N.,Bayukov, Oleg A.,Stolyar, Sergei V.,Iskhakov, Rauf S. Techno-Press 2022 Advances in nano research Vol.12 No.6
We prepared two samples of ultrafine ferrihydrite (FH) nanoparticle ensembles of quite a different origin. First is the biosynthesized sample (as a product of the vital activity of bacteria Klebsiella oxytoca (hereinafter marked as FH-bact) with a natural organic coating and negligible magnetic interparticle interactions. And the second one is the chemically synthesized ferrihydrite (hereinafter FH-chem) without any coating and high level of the interparticle interactions. The interparticle magnetic interactions have been tuned by modifying the nanoparticle surface in both samples. The coating of the FH-bact sample has been partially removed by annealing at 150℃ for 24 h (hereinafter FH-annealed). The FH-chem sample, vice versa, has been coated (1.0 g) with biocompatible polysaccharide (arabinogalactan) in an ultrasonic bath for 10 min (hereinafter FH-coated). The changes in the surface properties of nanoparticles have been controlled by XPS. According to the electron microscopy data, the modification of the nanoparticle surface does not drastically change the particle shape and size. A change in the average nanoparticle size in sample FH-annealed to 3.3 nm relative to the value in the other samples (2.6 nm) has only been observed. The estimated particle coating thickness is about 0.2-0.3 nm for samples FH-bact and FH-coated and 0.1 nm for sample FH-annealed. Mössbauer and magnetization measurements are definitely shown that the drastic change in the blocking temperature is caused by the interparticle interactions. The experimental temperature dependences of the hyperfine field <H<sub>hf</sub>>(T) for samples FH-bact and FH-coated have not revealed the effect of interparticle interactions. Otherwise, the interparticle interaction energy E<sub>int</sub> estimated from the <H<sub>hf</sub>>(T) for samples FH-chem and FH-annealed has been found to be 121k<sub>B</sub> and 259k<sub>B</sub>, respectively.
Aleksey L. Izhutov,Valeriy V. Iakovlev,Andrey E. Novoselov,Vladimir A. Starkov,Aleksey A. Sheldyakov,Valeriy Yu Shiishin,Vladimir M. Kosenkov,Aleksandr V. Vatulin,Irina V. Dobrikova,Vladimir B. Suprun 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.7
The paper summarizes the irradiation test and post-irradiation examination (PIE) data for the U-Mo low-enriched fuel thatwas irradiated in the MIR reactor under the RERTR Program. The PIE data were analyzed for both full-size fuel rods andmini-rods with atomized powder dispersed in Al matrix as well as with additions of 2%, 5% and 13% of silicon in the matrixand ZrN protective coating on the fuel particles. The full-size fuel rods were irradiated up to an average burnup of ~ 60%235U; the mini-rods were irradiated to an averageburnup of ~ 85%235U. The presented data show a significant increase of the void fraction in the U-Mo alloy as the U-235burnup rises from ~ 40% up to ~ 85%. The effect of irradiation test conditions and U-235 burnup were analyzed with regard tothe formation of an interaction layer between the matrix and fuel particles as well as generation of porosity in the U-Mo alloy. Shown here are changes in distribution of U fission products as the U-235 burnup increases from ~ 40% up to ~ 85%.
Izhutov, Aleksey.L.,Iakovlev, Valeriy.V.,Novoselov, Andrey.E.,Starkov, Vladimir.A.,Sheldyakov, Aleksey.A.,Shishin, Valeriy.Yu.,Kosenkov, Vladimir.M.,Vatulin, Aleksandr.V.,Dobrikova, Irina.V.,Suprun, V Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.7
The paper summarizes the irradiation test and post-irradiation examination (PIE) data for the U-Mo low-enriched fuel that was irradiated in the MIR reactor under the RERTR Program. The PIE data were analyzed for both full-size fuel rods and mini-rods with atomized powder dispersed in Al matrix as well as with additions of 2%, 5% and 13% of silicon in the matrix and ZrN protective coating on the fuel particles. The full-size fuel rods were irradiated up to an average burnup of ${\sim}60%^{235}U$; the mini-rods were irradiated to an average burnup of ${\sim}85%^{235}U$. The presented data show a significant increase of the void fraction in the U-Mo alloy as the U-235 burnup rises from ~ 40% up to ~ 85%. The effect of irradiation test conditions and U-235 burnup were analyzed with regard to the formation of an interaction layer between the matrix and fuel particles as well as generation of porosity in the U-Mo alloy. Shown here are changes in distribution of U fission products as the U-235 burnup increases from ~ 40% up to ~ 85%.
Lim, Chang Sung,Atuchin, Victor V.,Aleksandrovsky, Aleksandr S.,Denisenko, Yuriy G.,Molokeev, Maxim S.,Oreshonkov, Aleksandr S. Materials Research Society of Korea 2019 한국재료학회지 Vol.29 No.12
New triple tungstate phosphors NaPbLa(WO<sub>4</sub>)<sub>3</sub>:Yb<sup>3+</sup>/Ho<sup>3+</sup> (x = Yb<sup>3+</sup>/Ho<sup>3+</sup> = 7, 8, 9, 10) are successfully fabricated by microwave assisted sol-gel synthesis and their structural and frequency upconversion (UC) characteristics are investigated. The compounds crystallized in the tetragonal space group I4<sub>1</sub>/a and the NaPbLa(WO<sub>4</sub>)<sub>3</sub> host have unit cell parameters a = 5.3927(1) and c = 11.7961(3) Å, V = 343.05(2) Å<sup>3</sup>, Z = 4. Under excitation at 980 nm, the phosphors have yellowish green emissions, which are derived from the intense <sup>5</sup>S<sub>2</sub>/<sup>5</sup>F<sub>4</sub>→<sup>5</sup>I<sub>8</sub> transitions of Ho<sup>3+</sup> ions in the green spectral range and strong <sup>5</sup>F<sub>5</sub>→<sup>5</sup>I<sub>8</sub> transitions in the red spectral range. The optimal Yb<sup>3+</sup>:Ho<sup>3+</sup> ratio is revealed to be x = 9, which is attributed to the quenching effect of Ho<sup>3+</sup> ions, as indicated by the composition dependence. The UC characteristics are evaluated in detail under consideration of the pump power dependence and Commission Internationale de L'Eclairage chromaticity. The spectroscopic features of Raman spectra are discussed in terms of the superposition of Ho<sup>3+</sup> luminescence and vibrational lines. The possibility of controlling the spectral distribution of UC luminescence by the chemical content of tungstate hosts is demonstrated.
High-temperature oxidation of europium (II) sulfide
Yuriy G. Denisenko,Maxim S. Molokeev,Alexander S. Krylov,Aleksandr S. Aleksandrovsky,Aleksandr S. Oreshonkov,Victor V. Atuchin,Nikita O. Azarapin,Pavel E. Plyusnin,Elena I. Sal’nikova,Oleg V. Andreev 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
The process of high-temperature oxidation of EuS in the air was explored in the temperature range of500–1000 C. The oxidation reaction enthalpy was determined (DH0exp =1718.5 kJ/mol). The study ofoxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 C, EuSis oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 C, onlyeuropium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by theRietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4ftransitions from the 5D0 state was investigated as a function of oxidation temperature.
Lim, Chang Sung,Aleksandrovsky, Aleksandr S.,Molokeev, Maxim S.,Oreshonkov, Aleksandr S.,Atuchin, Victor V. ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.713 No.-
<P><B>Abstract</B></P> <P>Ternary scheelite-type molybdate NaSrLa<SUB>(1-<I>x</I>-<I>y</I>)</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>:<I>x</I>Er<SUP>3+</SUP>,<I>y</I>Yb<SUP>3+</SUP> (<I>x</I> = <I>y</I> = 0, <I>x</I> = 0.1 and <I>y</I> = 0.2, <I>x</I> = 0.05 and <I>y</I> = 0.45, <I>x</I> = 0.2 and <I>y</I> = 0) phosphors were successfully synthesized by the microwave sol-gel method for the first time. Well-crystallized particles formed after the heat-treatment at 900 °C for 16 h showed a fine and homogeneous morphology with a particle size of 2–3 μm. The crystal structures were refined by the Rietveld method in space group <I>I</I>4<SUB>1</SUB>/<I>a</I>. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under the excitation at 980 nm, the NaSrLa<SUB>0.7</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>:0.1Er<SUP>3+</SUP>,0.2Yb<SUP>3+</SUP> and NaSrLa<SUB>0.5</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>:0.05Er<SUP>3+</SUP>,0.45Yb<SUP>3+</SUP> particles exhibited a strong 525-nm emission band, a weaker 550-nm emission band in the green region and weak 655-nm, 490-nm and 410-nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail. The presence of Sr in NaSrLa(MoO<SUB>4</SUB>)<SUB>3</SUB>, in comparison with NaCaLa(MoO<SUB>4</SUB>)<SUB>3</SUB> compound, leads to frequency shift mainly in the low region of Raman spectra. The MoO<SUB>4</SUB> bending vibrations are most susceptible to changes in the distance between the nearest oxygen atoms in the nearest neighboring MoO<SUB>4</SUB> groups.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The NaSrLa(MoO<SUB>4</SUB>)<SUB>3</SUB>:Er<SUP>3+</SUP>,Yb<SUP>3+</SUP> phosphors were synthesized by the microwave method. </LI> <LI> The crystal structures were refined by the Rietveld method in space group <I>I</I>4<SUB>1</SUB>/<I>a</I>. </LI> <LI> Under the excitation at 980 nm, a strong green emission is observed in the phosphors. </LI> </UL> </P>
Sidorov Ilya G.,Tereshchenko Nataliya N.,Korotkov Andrey A.,Chuzhikova-Proskurnina Olga D.,Hiep Nguyen Trong,Trapeznikov Aleksandr V. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
Determination of 137Cs, 40K and 210Po in water, bottom sediments and suspended matter of river systems of the Can Gio Biosphere Reserve, Vietnam was carried out. The average activity concentration of 137Cs in waters of Ca Gau and Long Tau was 0.89 ± 0.14 and 1.08 ± 0.15 Bq m3 and was comparable to the levels of this radioisotope in waters of the East Sea. The activity concentration of 137Cs in bottom sediments was 2.23 ± 0.81 and 3.63 ± 1.24 Bq kg1 . The activity concentration of 137Cs in water and bottom sediments could be characterized as low. So, the water areas of the Ca Gau and Long Tau rivers could be attributed to areas with insignificant pollution by technogenic radionuclides. The 210Ро activity concentration in bottom sediments of the Ca Gau and Long Tau rivers ranged from 9.2 ± 1.2 to 25.5 ± 2.1 Bq kg1 , which is typical for river bottom sediments. Such values indicate the absence of anthropogenic enhancement of the entry of this radionuclide into the Can Gio river systems. The 40K activity concentration varied within 467 ± 42e651 ± 39 Bq kg1 and represented typical values of potassium content in the bottom sediments of coastal water bodies, subject to a significant influence of the lithogenic component of suspended matter.