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Physical Sciences and Mathematics

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2019

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Articles 31 - 60 of 1612

Full-Text Articles in Engineering

Drainage Technology And Test Of Stratified Pressure Control With Four-Channels Of Cbm Well In Double Coal Seams, Pang Tao, Jiang Zaibing, Li Bingang, Du Xinfeng Dec 2019

Drainage Technology And Test Of Stratified Pressure Control With Four-Channels Of Cbm Well In Double Coal Seams, Pang Tao, Jiang Zaibing, Li Bingang, Du Xinfeng

Coal Geology & Exploration

Aiming at the problems of mutual interference between layers and serious damage in reservoirs in the production process of double-coal CBM wells, a four-channel stratified pressure control drainage technology was proposed, in the process of drainage, two coal seams were controlled in different pressure systems to achieve the purpose of stratified production and CBM well drainage device with four-channel packer, monitoring equipment, multi-channel tubing centralizer, roller sucker rod centralizer and auxiliary communication tube for double coal seams was developed. Field application test shows that the four-channel packer can achieve the isolation effect according to the needs, so that the two …

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Optimization Study On Correlation Method Of Multiple Coal Seams, Shu Jiansheng, Ma Liang, Jia Lilong Dec 2019

Optimization Study On Correlation Method Of Multiple Coal Seams, Shu Jiansheng, Ma Liang, Jia Lilong

Coal Geology & Exploration

At present, the development trend of coal mining in China is transferring from the east to the western regions. The Yan'an Formation coal bearing measures middle Jurassic is the most widely distributed in the west, it is of the continental sedimentary environment, which has the characteristics of big change of lithofacies, multiple coal seams, unstable coal seams and less marker, there are difficulties in coal seam correlation, such as lack of basis and multi-solution phenomenon. Based on the wide application of high precision seismic exploration and digital logging technology, the fine correlation of terrestrial multi-coal seams was carried out by …

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Simulation Of Seepage Water Inrush Mechanism And Strength Controlling Factors Of Collapse Column, Huo Bingjie, Xie Zhenhua, Fan Zhanglei, Jing Xuedong Dec 2019

Simulation Of Seepage Water Inrush Mechanism And Strength Controlling Factors Of Collapse Column, Huo Bingjie, Xie Zhenhua, Fan Zhanglei, Jing Xuedong

Coal Geology & Exploration

In order to study the mechanism and main control factors of seepage water inrush in roadway affected by collapse columns, Darcy, Brinkman and N-S equations were used to describe the linkage system of flow field in aquifer, collapse column and water inrush roadway. Variables such as different parameters and different boundaries were selected to analyze the main factors influencing the seepage water inrush intensity of collapse columns. The results show that under the conditions of constant pressure and flow, the increase of aquifer permeability will lead to the increase of flow velocity in an area where the aquifer meets the …

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Particle Swarm Optimization-Based Bionic Principle For Solving Hydrodynamic Dispersion Coefficient In Jiang'an Campus, Mei Jie, Li Guangwei, Xia Chengcheng, Liu Yaping, Liu Wen, He Xinyue Dec 2019

Particle Swarm Optimization-Based Bionic Principle For Solving Hydrodynamic Dispersion Coefficient In Jiang'an Campus, Mei Jie, Li Guangwei, Xia Chengcheng, Liu Yaping, Liu Wen, He Xinyue

Coal Geology & Exploration

Hydrodynamic dispersion coefficient is an important parameter in the study of solute transport in groundwater. In order to understand the transport law of pollutants in groundwater, the particle swarm optimization(PSO) algorithm based on bionic principle is used to solve the hydrodynamic dispersion coefficient of phreatic aquifer under natural flow field in the dispersion test site of Jiang'an Campus of Sichuan University. Compared with the least-square method and the standard curve comparison method, the results show that the results of the standard curve method are subject to subjective influence, and the errors are relatively large. The results of least square method …

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Surface Subsidence Law Caused By Fully Mechanized Caving Mining Under Railway, Deng Niandong, Yao Ting, Shang Hui, Liu Donghai Dec 2019

Surface Subsidence Law Caused By Fully Mechanized Caving Mining Under Railway, Deng Niandong, Yao Ting, Shang Hui, Liu Donghai

Coal Geology & Exploration

In order to ensure the safe running of the special railway for Guozhuang coal mine, the law of surface movement and deformation in goaf of the coal mine was studied on the basis of the analysis of the actual observation data, the monitoring scheme and control measures of railway under dynamic coal mining conditions were put forward in accordance with that. The results show that the surface movement and deformation are intense, the subsidence value is large, but the subsidence velocity is relatively small on account of fully mechanized caving; Surface subsidence coefficient, the main impact tangent tanβ, …

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Deformation Characteristics And Support Timing Of Deep High Stress Roadway, Geng Weile, Dong Ziwen, Guo Shengli, Pi Zikun Dec 2019

Deformation Characteristics And Support Timing Of Deep High Stress Roadway, Geng Weile, Dong Ziwen, Guo Shengli, Pi Zikun

Coal Geology & Exploration

The rock occurrence environment and structural characteristics determine its strength criteria, and affects the mechanical and deformation characteristics of surrounding rock. This paper relies on the deep replacement project of a mine in Yunnan, based on the rock strength criteria, and analyzes the mechanics and deformation characteristics of surrounding rock and the reasonable secondary support time of roadway to decrease the influence of the roadway support effect because of the obvious rheological properties present under high ground stress. The results showed that the min-average simulated deviations mf was generalized H-B criterion which was aimed at the sum of deviation absolute …

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Nishihara Acceleration Model-Based Experiment Of Creep Characteristics Of Coal, Qu Lina, Li Bo Dec 2019

Nishihara Acceleration Model-Based Experiment Of Creep Characteristics Of Coal, Qu Lina, Li Bo

Coal Geology & Exploration

For conquering limitation that the traditional Nishihara model cannot describe the accelerated creep characteristics of coal body, according to the visco-elastic-plastic flow characteristics of coal in the accelerated creep stage, a nonlinear visco-elastic-plastic model was used to replace the ideal viscoelastic-plastic body in Nishihara model to establish the improved Nishihara acceleration model. And creep equation of the improved model under equal confining pressure triaxial condition was also deduced. Afterwards, the improved accelerated creep model was analyzed by the creep test data of coal specimens in the triaxial creep tests using the method of model identification. The results show that the …

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Shear Strength Characteristics Of Slope Soil In Dumping Site In High-Cold Mining Area, Zhou Linhu, Yang Youqing, Hu Xiasong, Li Xilai, Wang Tao, Liu Changyi Dec 2019

Shear Strength Characteristics Of Slope Soil In Dumping Site In High-Cold Mining Area, Zhou Linhu, Yang Youqing, Hu Xiasong, Li Xilai, Wang Tao, Liu Changyi

Coal Geology & Exploration

The paper aims to study the shear strength characteristics and the influencing factors of the root-soil composite systems of herbs in the dump slope of the high-cold mining area. The dumping site of Jiangcang mining area of Muli Coalfield, located in the northeastern Qinghai-Tibet Plateau, was selected as the study area. For the dump slope which was planted with Elymusnutans Griseb., combined with Poacrymophilakeng, density, moisture content and root content of different depths of root-soil composite systems below the surface of slope were tested; the cohesion and the internal friction angle of soil without roots and root-soil composite systems …

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Optimization Of Surface Contact-Based Thermal Conductivity Model Of Cemented Particles, Chen Yuanjiang, Jiang Zhiqiang, Tan Zhiren Dec 2019

Optimization Of Surface Contact-Based Thermal Conductivity Model Of Cemented Particles, Chen Yuanjiang, Jiang Zhiqiang, Tan Zhiren

Coal Geology & Exploration

In order to explore better the variation law of thermal conductivity of geomaterials, and reduce the thermal damage caused by the problem, according to the structural characteristics of the cemented particles, combined with the effective medium thermal conductivity model and the surface contact thermal conductivity model, the effective thermal conductivity calculation model suitable for the geotechnical cemented particulate material was constructed, and the state of the particulate matter and the cementitious matrix were considered. The transient hot wire method was applied to test the thermal conductivity of the experimental test block, and the predicted values were compared with the measured …

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Numerical Calculation Of Heat Transfer In Single Medium-Deep Geothermal Well, Shang Hongbo, Zhao Chunhu, Jin Dewu, Xu Shuanhai, Wang Xiaodong, Zhang Weidong, Han Yongliang Dec 2019

Numerical Calculation Of Heat Transfer In Single Medium-Deep Geothermal Well, Shang Hongbo, Zhao Chunhu, Jin Dewu, Xu Shuanhai, Wang Xiaodong, Zhang Weidong, Han Yongliang

Coal Geology & Exploration

Medium-deep geothermal single well heat transfer is a technology of developing geothermal energy to "obtain heat without extracting groundwater". This technology has the advantages of not damaging the groundwater environment and taking more heat. However, there are few studies on the numerical calculation of single well heat transfer above 3000m depth. In this paper, based on the geothermal geological conditions in Xi'an, the numerical method was used to calculate the heat transfer of a medium-deep geothermal single well with different well structures (L-shaped directional wells and cluster directional wells) under the scenario of continuous operation of a heating season. The …

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Fluid Factor Of Fracture And Seismic Velocity Response In Anisotropic Coal Beds, Li Qin, Ma Suibo, Zhao Bin Dec 2019

Fluid Factor Of Fracture And Seismic Velocity Response In Anisotropic Coal Beds, Li Qin, Ma Suibo, Zhao Bin

Coal Geology & Exploration

The storage and transport of gas and water in coal seam are related to the density, strike and filler of cracks. Research on the identification and prediction of coal seam cracks will be helpful to prevent and control disastrous accidents in coal mines, such as water inrush and gas outburst. It plays an important role in the safety evaluation of coal mining. Based on the theory of fracture equivalent model, the variation characteristics of fluid factor in coal seam crevices with different fillings and fracture weaknesses parameters(fracture density, aspect ratio, volume modulus, shear modulus, Lamé parameters) are analyzed by combining …

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Influencing Factors Of Azimuth Electromagnetic Wave Roof And Floor Detection While Drilling Along Coal Seam, Chen Gang, Fan Yiren, Li Quanxin Dec 2019

Influencing Factors Of Azimuth Electromagnetic Wave Roof And Floor Detection While Drilling Along Coal Seam, Chen Gang, Fan Yiren, Li Quanxin

Coal Geology & Exploration

Aiming at the problems of poor detection accuracy and low efficiency of roof and floor interface in horizontal well drilling in coal mine, the design idea of explosion-proof azimuth electromagnetic wave logging tool while drilling in coal mine is put forward. In order to suit the working environment of underground coal seam, the influence of instrument parameters such as source distance, transmitting frequency and coil installation angle on signal response was obtained by forward simulation. The results show that the received signal strength of the azimuth electromagnetic wave instrument while drilling increases with the increase of transmitting frequency, coil distance …

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Research And Application Of Casing Milling And Fishing Technology In Floor Comb-Shaped Directional Borehole, Guan Qiangsheng, Wei Hongchao Dec 2019

Research And Application Of Casing Milling And Fishing Technology In Floor Comb-Shaped Directional Borehole, Guan Qiangsheng, Wei Hongchao

Coal Geology & Exploration

In order to solve the problem that using the conventional strong-force rotary drawing process for borehole sticking accident in comb-shaped directional borehole in floor is not ideal, and using reverse thread drill pipe or strong twist cause big time and economic loss, through the calculation and analysis of the passing capacity of casing milling and fishing pipe in the curved hole, the technical parameters of casing milling and fishing, the sticking accident of floor comb-shaped directional borehole with the depth of 344 m in a coal mine in Henan Province was successfully solved. The application results show that the maximum …

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Csamt Phase Correction And Its Application In Detection Of Water-Accumulating Area Of Goaf In Coal Mine, Su Chao, Hou Yanwei, Wang Cheng, Li Dan Dec 2019

Csamt Phase Correction And Its Application In Detection Of Water-Accumulating Area Of Goaf In Coal Mine, Su Chao, Hou Yanwei, Wang Cheng, Li Dan

Coal Geology & Exploration

Magnetic field data of controlled source audio magnetotelluric method(CSAMT) is vulnerable to electromagnetic interference, and will lead to serious degradation of phase data quality. The affected phase data are corrected by referring to the high quality phase data of adjacent measuring points and combining the least squares fitting and interpolation method. Through forward simulation analysis, it is found that cubic polynomial interpolation is effective, not only can restore the variation characteristics of phase curve more accurately, but also involve the corrected phase data in the inversion calculation, so that the inversion results are more accurate and reliable. The method is …

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Test Of Water Absorbent Resin For Disposal Of Waste Mud, Wei Meng, Qi Jinhui, Zhang Ningxin, Wen Jun Dec 2019

Test Of Water Absorbent Resin For Disposal Of Waste Mud, Wei Meng, Qi Jinhui, Zhang Ningxin, Wen Jun

Coal Geology & Exploration

In the course of engineering construction, a lot of abandoned mud is produced. How to properly handle these mud has received extensive attention. In this paper, the application of absorbent resin in waste mud treatment is studied by series of experiments. Compared with the common flocculants, the flocculation effect of absorbent resin is better, and the separation speed of waste mud solid liquid can be accelerated obviously. The water absorption rate of absorbent resin in the mud reaches 46.33 g/g, which can be incorporated into the mud to greatly reduce the water content and fluidity of the mud within 30 …

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Concealed Riprap Detection Technology In Pile Foundation Engineering, Li Junjie, Ge Longjin, Zhang Honggang, Li Jianmin, Zhu Honglei, Li Guanhao Dec 2019

Concealed Riprap Detection Technology In Pile Foundation Engineering, Li Junjie, Ge Longjin, Zhang Honggang, Li Jianmin, Zhu Honglei, Li Guanhao

Coal Geology & Exploration

It is often necessary to use pile foundation to deal with soft soil foundation for the newly built gate station near the seawall. If there is a concealed riprap layer in the construction area, it will affect the construction progress of pile foundation and increase the construction cost. Furthermore, the spatial distribution characteristics of riprap also play a decisive role in the selection of pile foundation construction technology. In view of the blindness problem in using the drilling method to investigate the irregular concealed riprap, we adopt the comprehensive investigation technology combining the ground penetrating radar with the high density …

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Supporting Technology Of Roadway Crossing Fractured Zone Of Fault Under Dynamic And Static Load, Song Weihua, Di Chunlei, Deng Zhaorui Dec 2019

Supporting Technology Of Roadway Crossing Fractured Zone Of Fault Under Dynamic And Static Load, Song Weihua, Di Chunlei, Deng Zhaorui

Coal Geology & Exploration

The gateway 5303 encountered multiple normal faults during the driving in Changping mine of Jinmei Group. For the purpose that the gateway can pass through the faults safely and rapidly and ensure applicative methods and scope of supporting. So based on the principle of maximum principal stress and fracture damage mechanics of rock, the paper analyzes the crushing mechanism of the normal fault zone under dynamic and static load from macroscopic and microscopic perspectives. Then, the plastic failure model of fault zone was established, the normal fault sliding mechanism and supporting theory were combined to derive the expression of the …

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Fault Identification Technology Of Ant Attribute Optimization, Li Hongwei, Bai Xuelian, Cui Jingbin, Wan Zhonghong, Yuan Shihong, Chu Wanchang Dec 2019

Fault Identification Technology Of Ant Attribute Optimization, Li Hongwei, Bai Xuelian, Cui Jingbin, Wan Zhonghong, Yuan Shihong, Chu Wanchang

Coal Geology & Exploration

In the field of seismic geological exploration, the ant attributes is more and more widely used for rapid identification of fault system, and in the process of practical application, ant attributes based on 3D seismic data extraction are displayed either along strata slice(plan) or in section, the features of fault system and distribution characteristics of seismic events is not corresponding to the actual situation, the application effect is poorer, fault interpretation work is given priority to with manual interpretation backbone profile, unable to realize fault automatic tracking. In view of this widespread situation, this paper studies and analyzes the actual …

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Application Of High Precision Gravity Survey In Detecting Mined-Out Areas Of Fushun Coal Mine, Huan Hengfei, Gao Tie, Zhao Haiqing, Zhao Weijun, Guo Canwen, Shi Bin Dec 2019

Application Of High Precision Gravity Survey In Detecting Mined-Out Areas Of Fushun Coal Mine, Huan Hengfei, Gao Tie, Zhao Haiqing, Zhao Weijun, Guo Canwen, Shi Bin

Coal Geology & Exploration

In order to find out the location, depth and distribution range of the mined-out areas in Fushun coal mine, and comprehensively considering the factors affecting the geophysical methods in the cities, the method of high-precision gravity survey was firstly used to study the mined-out areas in the area. Firstly, by analyzing the physical differences of the mined-out areas, a theoretical model was established for forward calculation and preliminarily studied on applicability of the gravity method. Then, a large-scale work of high-precision gravity survey was arranged in the study area, and through potential field separation,3D apparent density inversion and boundary identification …

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Analysis Of Factors Affecting The Automatic High-Frequency Induction Brazing Strength Of Pdc, Dai Yongbo Dec 2019

Analysis Of Factors Affecting The Automatic High-Frequency Induction Brazing Strength Of Pdc, Dai Yongbo

Coal Geology & Exploration

With the development of automation and intelligentization in manufacturing industry, the research on PDC bit brazing automation is one of the key development directions of bit production technology. In order to study the influencing factors and adaptation methods of welding strength in PDC automatic brazing process, PDC high frequency induction welding and shear strength comparison test were carried out by using PDC and alloy pillar as the base material through special tooling and test conditions. Combined with the shear strength experiment and the morphology of brazing surface of PDC high-frequency induction brazing, the effect of brazing filler alloys, fluxes, surface …

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150 Years Since The Development Of The Periodic System Of Chemical Elements By D.I. Mendeleev, Yu. Ts. Oganesyan, Yu. E. Penionzhkevich Dec 2019

150 Years Since The Development Of The Periodic System Of Chemical Elements By D.I. Mendeleev, Yu. Ts. Oganesyan, Yu. E. Penionzhkevich

Eurasian Journal of Physics and Functional Materials

The year 2019 has been declared by UNESCO as the year of the Periodic Table of Elements. 150 years ago, an outstanding Russian scientist D.I. Mendeleev systematized the chemical elements known at that time by chemical properties and created a table of elements. Since then, almost 60 chemical elements have been added to those known 150 years ago. Now the table has 118 chemical elements, most of which were synthesized artificially, in particular, on charged particle accelerators. Especially vigorous growth in the synthesis and research of new heavy transfermium elements was observed during the last 20 years, when about 20 …

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The Effect Of Cupc Nanostructures On The Photo And Electrophysical Characteristics Of The Active Layer P3ht/Pcbm, A. K. Aimukhanov, B. R. Ilyassov, A. K. Zeinidenov, A. V. Zavgorodniy Dec 2019

The Effect Of Cupc Nanostructures On The Photo And Electrophysical Characteristics Of The Active Layer P3ht/Pcbm, A. K. Aimukhanov, B. R. Ilyassov, A. K. Zeinidenov, A. V. Zavgorodniy

Eurasian Journal of Physics and Functional Materials

The paper presents the results of a study of the influence of copper phthalocyanine (CuPc) nanostructures on the generation and transfer of charge carriers in the photoactive P3HT/PCBM layer. It was shown that the observed broadening and the shift in the maxima of the absorption spectra of P3HT/PCBM upon the addition of nanostructures to the polymer are associated with an increase in the degree of crystallization of the film. Using the method of impedance spectroscopy, it was found that CuPc nanostructures enhance the rate of recombination of charge carriers, which is probably due to the formation of surface defects. These …

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Methods Of Calculation Of Radiation Protection For Operational Safety Optimization At Working With Radionuclide Photon Radiation Sources, D. S. Kim Dec 2019

Methods Of Calculation Of Radiation Protection For Operational Safety Optimization At Working With Radionuclide Photon Radiation Sources, D. S. Kim

Eurasian Journal of Physics and Functional Materials

Operational dosimetry solves the problem of implementing the principle of optimizing radiation safety, which is closely related to regulation and justification and implies a realistic achievable reduction in the dose load on a person when using ionizing radiation sources by reducing operating time, increasing the distance to radioactive material and shielding for attenuation of ionization flux. The article describes two ways of determining the thickness of shielding under necessity of making operational decision to protect a person from radionuclide source of known activity or the dose rate created by it. Based on the required multiplicity of its attenuation, which allows …

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Md And Tem Evaluation Of Swift Xe Ion Induced Latent Tracks In Si3n4, R. A. Rymzhanov, A. Zhalmagambetova, A. Ibrayeva, A. Janse Van Vuuren, J. H. O’Connell, V. A. Skuratov Dec 2019

Md And Tem Evaluation Of Swift Xe Ion Induced Latent Tracks In Si3n4, R. A. Rymzhanov, A. Zhalmagambetova, A. Ibrayeva, A. Janse Van Vuuren, J. H. O’Connell, V. A. Skuratov

Eurasian Journal of Physics and Functional Materials

As known silicon nitride ceramics is considered as a candidate material for inert matrix fuel hosts used for transmutation of minor actinides. Unfortunately, by now very limited data is devoted to investigate of its stability under high energy heavy ion irradiation simulating fission fragment impact. Aim of our present study is a comparative analysis of parameters of latent tracks induced with swift Xe ion irradiation in polycrystalline Si3N4 using molecular dynamic (MD) simulation and high resolution transmission electron microscopy (TEM). Silicon nitride samples were irradiated with 220 MeV xenon ions at room temperature to fluence 5 × …

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Detailed Study Of Rf And No Isotopes Radioactive Decay Properties, M. S. Tezekbayeva, A. V. Yeremin, O. N. Malyshev, M. L. Chelnokov, V. I. Chepigin, A. V. Isaev, A. V. Karpov, A. A. Kuznetsova, A. G. Popeko, Yu. A. Popov, A. I. Svirikhin, E. A. Sokol, A. Lopez-Martens, K. Hauschild, O. Dorvaux, B. Gall, P. Mosat, B. S. Sailaubekov Dec 2019

Detailed Study Of Rf And No Isotopes Radioactive Decay Properties, M. S. Tezekbayeva, A. V. Yeremin, O. N. Malyshev, M. L. Chelnokov, V. I. Chepigin, A. V. Isaev, A. V. Karpov, A. A. Kuznetsova, A. G. Popeko, Yu. A. Popov, A. I. Svirikhin, E. A. Sokol, A. Lopez-Martens, K. Hauschild, O. Dorvaux, B. Gall, P. Mosat, B. S. Sailaubekov

Eurasian Journal of Physics and Functional Materials

The experiments of detailed study of No and Rf isotopes radioactive decay properties in complete fusion reactions50Ti+208Pb and48Ca+208,206,204Pb with subsequent neutron evaporation from the excited compound nucleus at the kinematic separator SHELS were performed in FLNR JINR. The data of the256Rf decay properties and preliminary data of250No decay properties are presented.

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An Analysis Of Cross Sections Of 9be + 28si Interaction In The Framework Of The Double Folding Model, A. M. Kabyshev, K. A. Kuterbekov, A. K. Azhibekov, K. Zh. Bekmyrza, A. M. Mukhambetzhan, M. K. Kenzhebek, Ye. K. Sovetkhanov, Zh. A. Yeltay Dec 2019

An Analysis Of Cross Sections Of 9be + 28si Interaction In The Framework Of The Double Folding Model, A. M. Kabyshev, K. A. Kuterbekov, A. K. Azhibekov, K. Zh. Bekmyrza, A. M. Mukhambetzhan, M. K. Kenzhebek, Ye. K. Sovetkhanov, Zh. A. Yeltay

Eurasian Journal of Physics and Functional Materials

In this paper the experimental data on the differential cross sections for elastic scattering of9Be ions on28Si nucleus at the energies of the incident nucleus ranging from 12 to 201.6 MeV were analyzed in the framework of the double folding model using the Paris NN-potential CDM3Y. A good agreement with the experimental angular distributions of differential cross sections for elastic scattering was obtained and the values of the total reaction cross sections were calculated. When the double folding potential was used as real and imaginary parts, no manifestation of the threshold anomaly was detected. The reason …

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Electron Hole Capture Centers In An Irradiated K2so4-Cu Crystal, T. N. Nurakhmetov, Zh. M. Salikhodzha, R. Z. Bakhtizin, A. M. Zhunusbekov, A. Zh. Kainarbay, D. H. Daurenbekov, B. M. Sadykova, K. B. Zhangylyssov, B. N. Yussupbekova Dec 2019

Electron Hole Capture Centers In An Irradiated K2so4-Cu Crystal, T. N. Nurakhmetov, Zh. M. Salikhodzha, R. Z. Bakhtizin, A. M. Zhunusbekov, A. Zh. Kainarbay, D. H. Daurenbekov, B. M. Sadykova, K. B. Zhangylyssov, B. N. Yussupbekova

Eurasian Journal of Physics and Functional Materials

The methods of vacuum ultraviolet and thermal activation spectroscopy were used to measure the excitation spectra of impurity radiation in the fundamental absorption band of K2SO4-Cu crystals at 15 K and 300 K. An energy transfer was detected from the base to Cu+ impurities. The band gap of crystals K2SO4 was estimated. In K2SO4-Cu crystals, recombination radiation bands were detected at 2.95 ÷ 3.0 eV corresponding to electron hole capture centers.

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Surface Modification Of Steel Mark 2 Electrolytic Plasma Exposure, Y. Y. Tabiyeva, B. K. Rakhadilov, G. K. Uazyrkhanova, L. G. Zhurerova, A. Maulit, D. Baizhan Dec 2019

Surface Modification Of Steel Mark 2 Electrolytic Plasma Exposure, Y. Y. Tabiyeva, B. K. Rakhadilov, G. K. Uazyrkhanova, L. G. Zhurerova, A. Maulit, D. Baizhan

Eurasian Journal of Physics and Functional Materials

This work is devoted to the research of the influence of the technological parameters of electrolytic plasma surface hardening on the structure and tribological properties of the surface of samples of the retaining steel mark 2. In the electrolytic plasma surface hardening was carried out in an electrolyte from an aqueous solution of 20% urea and 20% sodium carbonate. According to the result of metallographic and X-ray diffraction analysis, it was determined that the phase composition of steel mark 2 after processing varies, and fine martensite with a small amount of troostite and iron oxide is formed on the surface …

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Shell Model Calculations For Deformed Li Isotopes, A. K. Azhibekov, V. V. Samarin, K. A. Kuterbekov, M. A. Naumenko Dec 2019

Shell Model Calculations For Deformed Li Isotopes, A. K. Azhibekov, V. V. Samarin, K. A. Kuterbekov, M. A. Naumenko

Eurasian Journal of Physics and Functional Materials

The nuclear shell model and its application to studying the structure of nuclei with deformed and spherical shapes are discussed. Calculations of level energies and wave functions in the shell model of deformed and spherical nuclei are performed for7,8,11Li nuclei. A detailed calculation scheme for solving theradial Schrödinger equation is presented.

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Smart Factories, Dumb Policy? Managing Cybersecurity And Data Privacy Risks In The Industrial Internet Of Things, Scott J. Shackelford Dec 2019

Smart Factories, Dumb Policy? Managing Cybersecurity And Data Privacy Risks In The Industrial Internet Of Things, Scott J. Shackelford

Minnesota Journal of Law, Science & Technology

No abstract provided.

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