bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling internal waves in a two-layer fluid flow
Authors: Zhanbirova Gulmira , Zavyalova Galia , Muraveva Elena , Shabdirov Daryn
Published: July 2021

This study presents mathematical model of the internal waves and examines wave propagation in a two-layer fluid flow. Elements of the functional-analytical approach are used to develop the model. A flat unsteady motion of a two-layer liquid under a cover over a flat bottom is considered. The fluid is assumed to be ideal and incompressible. Internal waves are caused by external pressure application to the interface between the layers, oscillation of the flat bottom and disturbances in the flow. The power of the wave source is characterized by dimensionless parameter ε. The problem is formulated, and its solution is based on asymptotic analysis for 0<ε<1.
Forecasting the quality of mineral oils during oil refining according to the fuel and oil flow chart at Atyrau Refinery
Authors: Bukanova Aigul , Kayrliyeva Fazilat , Bukanova Saule , Karabassova Nagima , Sakipova Lydia
Published: July 2021

The article discusses the problem of rational oil refining at Atyrau Refinery. Based on a detailed study of the properties of low-sulfur oils of Kazakhstan, in order to assess the potential for the selection of petroleum oils, effective refining methods with modern technologies are shown. A graph is given that allows us to assess the raw mate-rial potential of the Republic of Kazakhstan for lube fractions of oil. The potential reserve of the considered deposits can fully meet the needs of the Republic in oils. The physical and chemical properties of crude oil sup-plied to Atyrau refinery, with a view to their use as raw materi-als for the oil refining and production. The results of experiments on hydrocracking of the plant’s vacuum gasoil are also presented, indicating that this refining option allows you to obtain not only light distillates (gasoline and diesel fuel), but also excellent base oils. This can significantly advance the oil refining in the enterprise as a whole. On the basis of experimental studies, the correlation dependence of the viscosity index on the hydrocarbon-type composition of oils was revealed, which allows predicting the quality of the resulting product.
Ensuring timely repair of power transformers based on data of complex diagnostics
Authors: Sultanov Makhsud , Zenina Elena , Shamigulov Peter , Lunenko Valentina , Zhelyaskova Olga
Published: July 2021

Timely diagnosis of power transformers is an essential component of ensuring reliable and safe operation of power stations and substations, on which the reliability of the power system depends. Detection of defects in the initial stage allows to maintain reliable operation of transformers, helps to define the "life cycle" and simplify the planning of their replacement. The paper presents an analysis of existing approaches to the creation of power equipment diagnostics systems using the example of power transformers. A neural network model has been developed, demonstrating the possibility of using power transformers to estimate the current residual resource based on the analysis of available diagnostic data.
Simulation of single-phase ground short circuit protection device
Authors: Zhumadirova Aliya , Markovskiy Vadim , Kislov Aleksandr
Published: July 2021

The most common type of short circuit in a three-phase system is a single-phase-to-ground short circuit, accounting for 70 to 90% of electrical faults. In this paper simulation of the protective device from single-phase-to-ground short circuit with automatic change of current setting in electrical networks of 6-10 kV voltage on the basis of Coloured Petri Net is considered. The complexity of elaborated technical systems makes the problem of their modelling actual at the stage of development with the purpose of obtaining estimations of prospective and achievable characteristics. Now the modelling theory of the dynamic discrete systems, based on the formalism of Coloured Petri Nets has a wide application. Petri Net, describing the device operation, was designed and analysed using CPN Tools Programm. The resulting Petri net is correct, as it is live, reversible and safe. Thereby designed device can provide the selective protection from single-phase-to-ground short circuit.
Digitalization and Problems of the Educational Processes Based on University in the Pandemic Condition
Authors: Torkunova Julia , Khabrieva Milyausha , Torkunov Oleg
Published: July 2021

The aim of the study is to analyze the problems that have arisen in connection with the country’s universities shift to the remote mode of educational activities during the pandemic. The research objective is: to identify problems of ensuring educational process quality, to study the experience of organizing educational activities during the pandemic. Methods: collection of the studied data, based on a student and university professors survey using questionnaires, on their attitude to the learning process in the remote learning format during the coronavirus pandemic. Systematic analysis and synthesis of the survey results were given; revealed the quantitative and qualitative characteristics of the analysis subject; summarized the experience of educational activities in the revote mode, in the conditions of intensive launch for digital transformation of the educational process. Results: the experience of the educational process digital transformation in the context of the coronavirus pandemic, at a time when only remote educational technologies were used, was generalized. The most severe problems that appeared during the emergency transition of the university to the remote mode of educational activity were indentified. Conclusions: The pandemic has changed the system of higher education, accelerated the process of implementing digital technologies, education became mixed, and the requirements for the teaching staff of the university changed. Digitalization has great potential for educational environment integration. Through digital technologies, the efficiency of the university is increasing in accordance with the goals and objectives.
Analysis of multipolar generators operating efficiently in low-speed water and wind flows using ANSYS MAXWELL program
Authors: Sadullaev Nasullo , Nematov Shukhrat , Sayliev Farid
Published: July 2021

The article analyses generators generating efficient electricity at low speed water and wind flows. High rotating speed generators are used in wind farms and micro-hydropower. Reduction gears are used to provide the generators with the required number of rotations. The use of reduction gears in the power system leads to a decrease in the efficiency of the system and additional capital costs. The study analyzed multipolar synchronous generators. Both generators used a permanent magnet to generate electromotive force, and the generators are distinguished by the radial and axial placement of the permanent magnets. In order to analyze the generators, virtual models were created and analyzed in the Ansys Maxwell program. The Ansys Maxwell program is used to analyze electric machines in the electromagnetic field. The use of these programs in determining the optimal size of new devices is of great importance in saving time and improving cost-effectiveness.
Study and implementation of space vector pulse width modulation inverter on an arduino
Authors: Doan Ngoc Sy , Tsvetkov Alexey Nikolaevich , Nguyen Thi Hoa
Published: July 2021

Three-phase two-level inverters using space vector modulation (SVPWM) technology are one of the most popular inverter architectures today. The process of designing and manufacturing inverter systems usually goes through the following stages: simulation, hardware design, software programming on MCU, editing … In this article, we will focus on problem researching and implementing the SVPWM algorithm on an Arduino in detail. Besides, it is also based on the experimental survey of the inverter’s parameters, analyzing and proposing improved solutions for the inverter to operate optimally. SVPWM algorithm is tested on Arduino Mega 2560 board and small power inverter model.
Expansion of the functional abilities of the internal combustion engine exhaust gas recirculation method as a means of reducing harmful emissions
Authors: Sembaev Nurbolat Sakenovich , Ordabaev Ersen Kapsamadovich , Akhmetov Serik Imangalievich , Gabolla Zhalgas Zhanbolatovich
Published: July 2021

Road transport, as is known, provides high mobility of the population and significant cargo turnover both on a regional and interstate scale. Unlike large stationary sources of pollution, road transport is a huge number of mobile units of equipment operating in various working conditions. Therefore, the report and control of harmful car emissions is difficult. Other consequences of rapid motorization of society are traffic congestion, increased delivery time for goods and passengers, noise and stress of road users, etc. Based on the analysis of the conditions and operating modes of a car in a dense traffic flow, typical for urbanized areas, the article shows the possibility of using the well-known method of exhaust gas recirculation for a new purpose. This is the forced idle mode of the engine, which occurs when the car is braked by the engine without shutting down the transmission, which is present in modern standards for limiting harmful emissions. It is shown that in the indicated mode, it is possible to carry out complete recirculation of gases in order to achieve short-term isolation of the engine from the atmosphere. At the same time, the usage of the gas recirculation method for the main purpose is not excluded – to reduce the emission of nitrogen oxide NO in the engine.
A hybrid air conditioning system using solar energy to save electrical energy with improving performance
Authors: Al–Okbi Ahmed , Vankov Yuri , Mohammad Hussain Hasanen
Published: July 2021

The process of operating an air conditioning system by hybrid energy that uses solar energy for purpose of saving electrical energy with improving the performance from modern and environmentally friendly systems. With high demand for air-conditioning systems in summer in hot regions, especially in Iraq due to high temperatures, the issue of using renewable energies becomes more attractive due to the continuous interruption of electrical energy. Air conditioners in Iraq consume more than half of the average electricity production. Therefore, saving energy leads to ensuring the reliability of electricity and reduces the consumption of fuel and gases that pollute the environment and negatively affect on the ozone layer. In the current research, the atmosphere of the city Baghdad was used to collect the solar thermal energy through a vacuum solar collector and combine it with a conventional air conditioner in order to reduce the electrical energy consumption on the compressor and increase the coefficient of performance. Several tests were conducted on the experimental device for comparing results with the conventional device and evaluating performance. The results showed that the performance with the vacuum solar collector became more efficient 8.97 instead of 4.27 than with the conventional system, and the energy consumption decreased by 52%.
Artificial intelligence technologies as a factor in increasing the economic efficiency of generating companies
Authors: Troianova Elena , Lerman Evgenia , Baliasnikova Elena , Fiutik Ina , Savelieva Ekaterina
Published: July 2021

The article deals with the application of modern artificial intelligence technologies that affect the economic efficiency of generating companies. Scientific novelty lies in the approach to the consideration of artificial intelligence as both external and internal factors of influence on the dynamics of production and consumption of electricity. As a result of the study, the key aspects of the growth of the economic efficiency of the activities of energy generating companies are highlighted and characterized. The forecast of the prospective sustainable development of certain areas of the energy sector and the increase in energy consumption is presented.
Modernization of a combined-cycle gas turbine unit for operation in the dynamic district heating mode
Authors: Sednin Vladimir , Sednin Alexei , Rumyantsev Sergei
Published: July 2021

The ongoing changes in the unified power system of Republic of Belarus require cost-efficient technical solutions to increase flexibility and reliability of electricity supply. Expected power generation mix and plant load factor of the newly constructed sources give limited possibilities of cost-efficient and reliable operation. The paper introduces the optimization of peaking and reserve energy source constructed newly at site of the existing power plant. Transferring the existing combined-cycle gas turbine into a dynamic district heating mode enhances the operational and financial flexibility of total system in a long-term prospective.
Theoretical and Methodological Calculations of Solar Energy Resource Potentials in the Northern Garagum
Authors: Pendjiev Akhmet , Nazarov Serdar
Published: July 2021

The urgency of the issue is the development of the Garagum desert, which occupies 80% of the land resources of Turkmenistan. The aim of the research is to supply the desert regions of the Garagum with energy using solar energy technologies and installations. The research task - to determine the solar-energy resource potential using innovative methods of calculation in the design, creation and implementation of efficient solar energy technology and equipment. Methodology. To determine the gross, technical, economic and ecological potential, the natural and climatic conditions of the Northern Garagum are taken into consideration. Research methodology - used meteorological data, processed by laws of physics and mathematical calculation methods for thermal and photoelectric converters. Research results. The theoretical and methodological calculations of the gross, technical, economic and environmental potentials of solar energy are estimated, the energy efficiency of solar radiation is determined, and the optimal solar collector inclination angles for the Northern Garagum are calculated. Discussion and conclusion. As a result of the research, the resource potentials of solar energy were obtained, converted into thermal and electrical energy, kW•h/m2 per year: gross - 1844.6; technical - 1227.58 and 244.85; economic - 1354.58 and 270.25. Environmental potentials, CO2, kg / year: 784.96 and 156.6. The most effective for the use of solar collectors in the Northern Garagum for months of the year with an angle of inclination is: 60 degrees - January, February, November, December; 45° - March, October; 30° - from April to September.
Analysis of the concepts of building microgrids containing distributed generation objects
Authors: Vinogradov Alexander V. , Seyfullin Anatoly Y. , Vinogradova Alina V. , Bolshev Vadim E. , Bukreev Alexey V. , Shakurova Zumeyra M.
Published: July 2021

In this article, the authors consider the materials of research on the construction and operation of intelligent power supply systems with a nominal voltage of up to 1000 V, containing distributed generation facilities. The author’s approach to the construction of microgrids based on multi-contact switching systems is proposed. The similarities and differences of the presented concepts are determined. The main problematic issues that arise in the process of implementing projects for the construction of microgrids and the management of electric power modes of operation are formulated. The ways of solving the problems related to the management of the modes of operation of microgrids are proposed.
Challenges and methods of monitoring the occurrence of unsanctioned voltage in the power grid
Authors: Panfilov Alexander , Vinogradov Alexander , Vinogradova Alina , Bolshev Vadim , Shakurova Zumeira , Zaugolnikova Elena
Published: July 2021

The review of sources dedicated to the issues of monitoring in electric networks made in the article showed that the works of many scientists are aimed at developing methods, technical means, systems for monitoring current and voltage in various operation modes of power grids. The main objectives of monitoring are identified, it is shown that monitoring of parameters in the network operation modes provides observability of the network, which, in turn, allows to make timely decisions about switching in the network, regulating the parameters of the network operation modes. The relevance of monitoring for detecting cases of unauthorized voltage in the 0.4 kV power networks is shown. Similar cases lead to the risk of electric shock to people, increasing the risk of operating electrical networks. Identification of the occurrence of unauthorized voltage in the 0.4 kV network provides ways to prevent its transformation at substations of 10/0. 4 kV to a voltage of 10 kV. Therefore, it is relevant to develop methods for detecting unauthorized voltage in the 0.4 kV electric system. The methodological principles and one of the developed methods for monitoring the occurrence of unauthorized voltage in power transmission lines of 0.4 kV and blocking the reverse transformation on substations 10/0.4 kV, as well as the device for its implementation, are shown.
Polymer Degradation: Category, Mechanism and Development Prospect
Authors: He Yuanxin , Li Hongyu , Xiao Xiang , Zhao Xinyu
Published: July 2021

With the increasing demand for polymers, white pollution has become a serious concern all around the world. The admirable degradation methods of them are desirable for overcoming this problem. In the past several decades, numerous researches on polymer degradation have been reported. This review commits to different degradation strategies of polymers and four main degradation protocols firstly, including photodegradation, oxidative degradation, catalytic degradation, and biodegradation, are demonstrated in detail. Secondly, some specific samples are discussed for each kind of degradation. Finally, the outlook and future of polymer degradation are proposed. In particular, the comprehensive comparison of different degradation methods is covered to provide the best choice for dealing with different polymers wastes. These will be beneficial to the development of processing plastic and conversion of polymer wastes.
Support effect on electrocatalytic performance of methanol oxidation over platinum catalysts
Authors: Gu Ke , Li JingWei , Zhao Jianguo , Liu Yajuan , Qiao Jun , Chen Dongdong , Hou Siyu , Zhang Ran
Published: July 2021

Graphene oxide and carbon nanotubes supported Pt nanoparticles were successfully synthesized by wet chemical reduction method. The structures and methanol oxidation performance of the two catalysts were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman spectroscopy (Raman) and electrochemical workstation. The results show that graphene oxide supported Pt nanoparticles exhibits higher electrochemical active surface area, methanol oxidation activity and stability compared with carbon nanotubes. It is proposed that the well dispersed Pt on the graphene oxide plays an important role for the excellent performancefor methanol oxidation.
Cold Model Study on Melting of Ice Made by KCl Solution in Gas-Water Two-Phase Plume Area
Authors: Wang Tao , Pei Kanghua , Zhao Jian , Li Zhao , Wang Huan , Yang Rongwang , Chen Chao
Published: July 2021

With the increasing of scrap usage in steelmaking processes, the melting of scrap becomes a very important phenomenon that limits the productivity and tap-to-tap time. Ice-water systems have been widely used to study the melting of scrap and alloys. In this study, the melting rate of saturated KCl solution ice spheres in gas-water two-phase plume zone are studied as a function of height of location, gas flowrate, and melt temperature. The results show that the shape of the ice sphere gradually changes firstly from spherical to elliptical, and finally becomes an irregular state. 1) The decreasing of the distance between the ice sphere and the bottom plugs, 2) the increasing of the gas flowrate, 3) the slightly increasing of bath temperature will all benefits the melting rate of ice spheres.
Applications of transition state calculations in the key cyclization of small molecule natural product synthesis
Authors: Qiu Rongxiang
Published: July 2021

The diversification of the conformation and configuration of the carbocyclic skeleton of natural products is an important reason for the diversity and complexity of the structure of natural products. The corresponding cyclization synthesis has attracted much attention. Computational chemistry approaches have the advantages of non-toxic, harmless and relatively low cost, and they are increasingly used to model and understand molecular phenomena. The reaction mechanism and thermodynamic parameters determine the feasibility of the cyclization and the enantioselectivity of the cyclization products. The transition state calculations can provide these thermodynamic parameters, which helps to elucidate the cyclization mechanism, calculate the reaction rationality, predict the performance of the new synthesis method and provide a basis for the comprehensive synthesis design.
Polymeric Micelles: Morphology, Synthesis, and Pharmaceutical Application
Authors: Bai Kun , Wang Anda
Published: July 2021

Polymeric micelles (PMs) are nanosized core-shell molecules formed by the self-assembly of amphiphilic block copolymers. Their unique morphologies, biocompatibility have allowed them to serve as drug carriers and have found wide applications in the pharmaceutical industry. This review summarizes the recent progress of PM development and its applications in the pharmaceutical field. Firstly, we discussed the fundamentals of polymeric micelles, the formation mechanism, and their relative morphologies. Then we listed various common synthetic methods, including the solvent-free method, solvent-switch method, microfluid method, etc. Secondly, we illustrated the application of polymeric micelles in pharmaceutical applications on targeting, imaging, and stimuli-responsive drug release. In the end, we summarize the fundamental aspect of how to prepare polymeric micelles, their resulting morphology, and their applications in the medical field. Finally, we provide insights into polymeric micelles’ future developments on their longer shelf life and better environmental adaptability.
Evaluation of fusion methods for GF-6 aiming to water body observation
Authors: Wang YiZhe , Liu Guo , Xue Bai , Guo Li , Zhang XueLi
Published: July 2021

Gaofen-6 (GF-6) has the advantages of wide coverage, multiple resolutions, and multiple bands, and can provide richer information for remote sensing interpretation. Image fusion method is the key process in high resolution remote sensing application. Guangdong-Hong Kong-Macao Greater Bay Area was selected as experiment area and four image fusion methods of HPF (High-Pass Fliter), NND (Nearest Neighbor Diffusion), GS (Gram-Schmidt) and Pansharp were employed to process panchromatic and multispectral imaging. In order to evaluate the result performances, firstly, four kinds of fusion results were evaluated by visual，and then established mean, standard deviation, entropy, average gradient, correlation coefficient and spectral distortion for quantitative evaluation of fusion results. The results demonstrated that The Pansharp algorithm and the GS algorithm have the best comprehensive evaluation of the GF-6 satellite fusion effect, taking into account the color effect of the image and the enhancement of spatial details, which can meet most fusion requirements. For land-based fusion areas, the Pansharp fusion method can be selected, and the GS fusion method can better reflect the water body information and is the most suitable fusion method for GF-6 satellite water body information enhancement among the four algorithms.
Risk Assessment of Flood Disaster in Linyi City Based on GIS
Authors: Huang Zheng
Published: July 2021

With the continuous acceleration of the urbanization process, the flood problem seriously affects the economic and social development of the city and the daily life of citizens. Therefore, taking Linyi City as an example, the flood disaster risk assessment is carried out, the Linyi City flood disaster assessment index system is constructed, and the methods of mathematical statistics, analytic hierarchy process and spatial overlay analysis are used to calculate the environmental sensitivity of Linyi City flood disasters with the help of GIS technology. , Risk of hazard factors, vulnerability of hazard-bearing bodies, disaster prevention and mitigation capabilities. The research results show that the hazard levels of flood disasters are increasing from west to east, and high-risk areas are distributed in Feixian and Junan counties; sensitivity is affected by topography and gradually increases from north to south; Lanshan District, Luozhuang District, etc. The city center is highly vulnerable due to its significant population and economic status, and has strong disaster prevention and mitigation capabilities.
A Study on the Formation and Evolution Model of Social Psychology in Major Public Health Emergencies
Authors: Yi Chenhe , Li Shan
Published: July 2021

The occurrence of local or regional major public health emergencies has seriously damaged human health and life safety, and has an impact on the psychological state of the public. The study introduces “social amplification of risk” effect and the mechanism of emotional infection, and constructs a process model of psychological prediction, psychological cognition and psychological behavior in the generation of social psychology of major public health emergencies, and from the level of individual emotions, group emotions and social emotions analyze the evolutionary model of social psychology; Research has found that information disclosure, government trust and social confidence are the main factors influencing the formation of social psychology of major public health emergencies.
Current Status and Development Trends of Sludge Disposal Technology
Authors: Huang Siyan , Yang Liu , Ji Lianguo
Published: July 2021

Sludge is a typical solid waste of sewage treatment plants, and its disposal methods have attracted much attention. This paper summarized the current technical routes for sludge disposal in China, including anaerobic digestion, anaerobic fermentation, incineration, landfill, land utilization, and building materials utilization. In the context of energy saving and carbon reduction and the promotion of resource recovery, enhanced pretreatment technology of sludge anaerobic digestion and anaerobic fermentation technology for fuel gas production are the first choices for sludge disposal and resource utilization. In addition, the development trend of sludge disposal technology was analyzed.
Concentration, distribution and occurrence of mercury in Chinese coals
Authors: Ren Wenying , Yang Liu , Cao Qingyi , Liang Chaoming
Published: July 2021

Mercury in coals is one of the important sources of atmospheric mercury, which is potentially harmful to the ecological environment. Based on the data of 970 coal samples, the concentration, spatial distribution and occurrence of mercury in Chinese coals were analyzed. The main conclusions are as follows: The distribution of mercury concentration in Chinese coalfields is uneven; medium and high mercury coals are mainly distributed in southwest China and eastern Inner Mongolia. The mercury concentrations in various coal-forming periods are as follows: K (0.320 mg/kg) > P2 (0.220 mg/kg) > C3 (0.179 mg/kg) > J (0.177 mg/kg) > D (0.165 mg/kg) > P1 (0.136 mg/kg) > C1 (0.090 mg/kg) > E (0.086 mg/kg) > T3 (0.066 mg/kg). The mercury concentrations in different coal ranks are as follows: Lignite (0.164 mg/kg), long flame coal (0.078 mg/kg), non-caking coal (0.256 mg/kg), weakly caking coal (0.086 mg/kg), gas coal (0.151 mg/kg), fat coal (0.122 mg/kg), coking coal (0.171 mg/kg), lean coal (0.393 mg/kg), meagre coal (0.161 mg/kg), anthracite (0.160 mg/kg). Sulfide bound state is the main form of mercury in coals, and pyrite is the main occurrence medium.
Practices and countermeasures for the treatment of black and odorous water bodies in the rural areas of Shandong Province
Authors: Xiuhua Shi , Qiong Wu
Published: July 2021

In recent years, with the rapid development of the rural economy, while the living standards of rural residents have been greatly improved, the environmental conditions in the rural areas are not optimistic, and water pollution is one of the most important ones. Therefore, in order to improve the rural ecological environment and promote the task of water pollution control, Shandong Province has issued “the Governance Action Plan of black and odor water in rural areas of Shandong Province”. This article mainly uses “ the Action Plan” as a guide to analyze the current situation of rural black water bodies in Shandong Province and the current problems and related countermeasures, and follow the “comprehensiveness, applicability, economy, long-term effectiveness and safety. According to the black and odorous water problems caused by natural, technological and human factors, we will adopt comprehensive methods such as water purification, dredging, source control and pollution interception[1]to promote the treatment of black and odorous water bodies in rural areas, solve outstanding water environment problems in rural areas, and speed up construction of beautiful and livable countryside.
Comparison of Two Different Calculation Methods of Fractional Vegetation Cover
Authors: kaitao Liao
Published: July 2021

Fractional Vegetation Cover (FVC) is an important parameter for soil erosion equation. The Fractional Vegetation Cover of typical soil erosion county in red soil region of South China was calculated by parameter revision method (PRM) and fusion method (FM).The results of the two methods were compared from two parts of FVC level and 24 half-months FVC. The results show that the FVC level calculated by PRM was concentrated in high level, and that calculated by FM is mainly in medium-high level and high level. The time variation of FVC in 24 half-months calculated by the two methods was the same, but the majority of FVC value calculated by PRM was higher than that calculated by FM. It is better to choose FM method to calculate FVC in estimating soil erosion.
Brief Introduction of Carbon Neutral International Organizations
Authors: Xin Wang , Cuifeng Ma
Published: July 2021

We searched the yearbook database of international organizations with “carbon” and “CO2” as key words, and got six international organizations related to carbon neutrality on the basis of cleaning the data. This paper will briefly introduce six carbon neutral international organizations included in the Yearbook database of international organizations to provide references for researchers.
Study on cyclic crosslinked polyphosphazene microspheres and its adsorption behavior for uranium (VI)
Authors: Xu Meixue , Liao Kaifa , Liu Mouwu , Tan Yi , Wang Yanfei
Published: July 2021

Poly (cyclotriphosphazene-co-4,4 '- diaminodiphenylsulfone) (PZD) microspheres were synthesi zed by precipitation polymerization of Hexachlorocyclotriphosphazene (HCCP) and polyfunctional organic monomers. The products were characterized by FTIR, SEM-EDS, XPS and bet. The adsorption behavior of PZD microspheres for uranium (VI) in aqueous solution and the influence of adsorption behavior were disc ussed. The results show that the PZD microspheres have a certain adsorption capacity for uranium (VI) in a queous solution. When pH = 3.5, adsorption time is 6h, solid-liquid ratio is 2.0g • L-1 and initial concentration of uranium (VI) is 30mg • L-1, the adsorption rate of uranium reaches the maximum.
Research progress and optimization prospect of constant boiling distillation technology
Authors: Ma Heng
Published: July 2021

Coboiling distillation is a special distillation method of separating the azeotropic system mixture, which is widely used in petroleum refining and chemical production. This paper reviewed the selection and characteristics of azeoliling agents, and introduced the research progress of home and abroad in detail. The system compares the advantages and disadvantages of the traditional constant boiling distillation and the new heat pump, compare the advantages, and presents the prospect of constant boiling distillation.
Surface roughness prediction of FFF-fabricated workpieces by artificial neural network and Box–Behnken method
Authors: Kandananond Karin
Published: July 2021

Fused Filament Fabrication (FFF) or Fused Deposition Modelling (FDM) or three-dimension (3D) printing are rapid prototyping processes for workpieces. There are many factors which have a significant effect on surface quality, including bed temperature, printing speed, and layer thickness. This empirical study was conducted to determine the relationship between the above-mentioned factors and average surface roughness (Ra). Workpieces of cylindrical shape were fabricated by an FFF system with a Polylactic acid (PLA) filament. The surface roughness was measured at five different positions on the bottom and top surface. A response surface (Box-Behnken) method was utilised to design the experiment and statistically predict the response. The total number of treatments was sixteen, while five measurements (Ra1, Ra2, Ra3, Ra4 and Ra5) were carried out for each treatment. The settings of each factor were as follows: bed temperature (80, 85, and 90 °C), printing speed (40, 80 and 120 mm/s), and layer thickness (0.10, 0.25 and 0.40 mm). The prediction equation of surface roughness was then derived from the analysis. The same set of data was also used as the inputs for a machine learning method, an artificial neural network (ANN), to construct the prediction equation of surface roughness. Rectified linear unit (ReLU) was utilised as the activation function of ANN. Two training algorithms (resilient backpropagation with weight backtracking and globally convergent resilient backpropagation) were applied to train multi-layer perceptrons. Moreover, the different number of neurons in each hidden layer was also studied and compared. Another interesting aspect of this study is that the ANN was based on a limited number of training samples. Finally, the prediction errors of each method were compared, to benchmark the prediction performance of the two methods: Box-Behnken and ANN.
(Re)naître à la vie après un viol
Authors: Guittonneau-Bertholet Mireille
Published: July 2021

Le viol constitue une atteinte majeure : effracté corporellement et psychiquement, le sujet se disloque et s’évanouit. Ainsi semble bien se réaliser la visée meurtrière inhérente au viol. Vécu à l’adolescence, le viol semble particulièrement à même de suspendre le processus adolescent lui-même. En effet, en entrainant notamment la confusion du dedans et du dehors, de la sexualité et de la mort, le viol décuple le chaos interne, inhérent à l’adolescence et fait de toute expression pulsionnelle un danger absolu. Le trauma règne alors en maître et contraint la psyché à recourir aux mécanismes de survie à sa disposition : clivage, déni notamment. Le travail analytique, comme on peut le voir avec l’histoire de Lucie, se révèle souvent très précieux pour permettre l’élaboration du trauma et est parfois l’occasion de mettre à jour certaines identifications antérieures que le viol semble confirmer et, en particulier, des assignations à se sacrifier, à renoncer à une position de sujet. La mise au travail du trauma permet alors au sujet de questionner ces assignations et de s’en affranchir. C’est alors que l’adolescence reprend ses droits et que peut s’engager le travail de subjectivation qui la caractérise.
Histoire de la psychiatrie et invariants
Authors: Jovelet Georges
Published: July 2021

Nombre d’ouvrages et d’articles sont consacrés à l’histoire chronologique ou périodique de l’aliénisme et de la psychiatrie. Les manifestations cliniques, les théories explicatives, la nosographie ou l’organisation des soins ont été l’objet de mutations lentes ou de moments de rupture apparente durant les deux siècles qui séparent la naissance de l’aliénisme de l’avènement de la Santé Mentale. L’auteur fait ici le choix d’aborder ce même sujet en isolant de la trame narrative historique des éléments de constance qui déterminent au sein de cette mouvance disciplinaire une continuité masquée. Quels sont ces invariants et quelle est l’actualité de certains d’entre eux, habillés par les usages de notre époque ? Que déduire de cette étude pour cerner l’identité de notre discipline, au sens de ce qui demeure à l’identique à travers le temps, et tenter d’appréhender un ordre organisateur sous-jacent ?
La guerre civile du Liban à la lumière du complexe de Caïn
Authors: Bou Khalil Maya
Published: July 2021

La guerre civile au Liban a duré 15 longues années durant lesquelles les libanais ont été soumis à une violence chronique et traumatique. Elle a laissé plus de 150.000 morts, 17.000 disparus et des centaines de milliers de déplacés. Cette guerre fut une des plus crues et cruelles des guerres à cause de l’implication de la majorité du peuple qui a conduit les frères à s’entretuer, ravivant ainsi l’histoire de Caïn et d’Abel. Dans le cadre d’une recherche menée auprès de 30 familles libanaises intitulée : « La guerre civile dé-mentalisante : hôte du trouble de la personnalité limite », visant à explorer la transmission des traumatismes de guerre aux jeunes de la deuxième génération à travers le défaut de mentalisation, nous avons rencontré Nabil. Son vécu traumatique témoigne que les violences fratricides, difficiles à intégrer, créent des difficultés au niveau du fonctionnement réflexif parental et sont transmises aux jeunes de la deuxième génération en les prédisposant au trouble de la personnalité limite.
Impact of social media on children´s relationship with brands
Authors: Hutmanová Nikoleta , Dorčák Peter
Published: July 2021

The paper focuses on how social media usage by children determines their interactions with consumer brands. First it describes how and when young children develop brand awareness and which are the most important predictors of this development. Those findings are then put in connection with the impact of social media. We elaborate on a deeper level how children approach online communications with brands in the social media context. Our assumptions are supported by a research conducted on a group of New Zealand children, both boys and girls in the age group of 11-14 years. This qualitative approach was implemented using in-depth interviews and identifies three key modes of brand interaction behaviour when young consumers use social media. According to these findings we assume that there is a connection between the use of social media and children´s relationship with consumer brands.
Pension Funds: Administrative and Investment Cost
Authors: Pokorný Jan , Hejduková Pavlína
Published: July 2021

The pension funds show us the alternative to the unfunded systems. This is the reason for long-terming attention. Disadvantages of funds financing include problems as indexation, inflation, or administrative and investment costs, which are decreasing the future profit for pensionary and efficiency of pension funds. This study aims to describe and analyse the administrative and investment costs and the determinants that affect these costs. The method of literary research and search of professional studies focused on empirical analysis of administrative and investment costs is used. Furthermore, the method of analysis and synthesis is used. The result of this study is an indication of the content and significance of costs and the definition of the main determinants influencing these costs. A prerequisite for the quality functioning of pension funds is the organization of the labor market and a high share of active participants. Determinants that increase costs include the number of participants in pension funds and total assets, the guarantee of income by the pension fund, and some investment instruments. Based on a search of empirical studies, the existence of economies of scale was confirmed. The limit of the study is the comparison of several countries where different legislation operates.
Human Resource Management Department Development and its Organizational Structures
Authors: Abuladze Lasha , Skorková Zuzana
Published: July 2021

The purpose of our study represents to determine how HRM’s organizational structures has been changed in the past and where HRM is positioned in present. For obtain theoretical knowledge, we used methods: collecting, gathering, sorting, content analysis, synthesis, comparative and deduction of information. Main sources of obtained information, knowledge represent professional articles and research. Today’s HRM, its position and roles (strategic partner, administrative expert, change agent, employee champion) has undergone five key stages of evolution, changes in organizational structures. At the early stages, HRM was positioned within different departments, as Labor/administrative manager and Welfare officer with roles: administrative expert and change agent. From later to modern stages (Personnel management, HRM and Modern HRM), HRM, by obtaining new roles (change agent and strategic partner), become mostly complected, complicated and managed to operate as separate department, on the same level of importance as financial, strategic, marketing and other departments within organizational structure. Based on todays trend, linked with HR-to-employee ratio, HR ratio per 100 employees year by year decreases, which might cause another important changes to HR department’s position within the organizational structure.
Sustainability Balanced Scorecard as Cost Accounting Instrument for Small and Medium Sized Companies
Authors: Achenbach Peter
Published: July 2021

This paper deals with the sustainability management concept of the Sustainability Balanced Scorecard (SBSC), which is a further development of the Balanced Scorecard (BSC) developed by Kaplan and Norton in the 1990s. In the SBSC the four classical perspectives of the BSC, which comprise “Finance”, “Customers”, “Internal Processes” and “Learning & Development”, are expanded to include environmental and social aspects (“Non Market”) enabling sustainability aspects to be fully integrated into the strategic management of companies. After a generic presentation of the elements of a BSC this paper shows the individual steps for the implementation of an SBSC, which as a heuristic for the creation of a target system, can contribute to the transformation of sustainability strategies into actions. The “openness” of the SBSC makes it possible that sustainability is not limited to a small number of companies that are primarily active in ecologically and socially oriented sectors, but appears practicable for all those companies that want to improve their performance in all three dimensions of sustainability through increases in ecological- and social-effectiveness and rises in ecological- and social-efficiency. By overcoming the “trade-off” between profit orientation and the focus on sustainability it is thus possible to achieve through enlarged consumer- and producer surplus an important contribution to the overall increase in the welfare economy.
Education as the basis for the career development
Authors: Matulcikova Marta , Hamranova Anna , Hrivikova Tatiana
Published: July 2021

A career can be seen as a sequence of employments, jobs and positions an individual fills in throughout their professional life. The choices made within the educational system seem to influence its successful start. The formal educational system is nowadays a preparatory stage for both professional life and lifelong learning. Retaining one’s employment and career development goes, therefore, hand in hand with lifelong learning while employers play a significant role in all forms of further professional development. Our purpose for this paper is to analyse the transition from education to employment and subsequent lifelong learning. The paper aims to assess the importance of the achieved educational level in further career development and the attitude of Slovak companies towards further training and development. Another aim is to formulate proposals and improvements for a successful transition to the professional sphere, as well as progress in the preparation for a career and lifelong employment. We used standard methods of scientific research such as analysis, synthesis, comparison, and selection, but a questionnaire survey was used as our major research method. To evaluate the results, descriptive statistical methods were implemented together with pivot tables. Eventually, we verified our hypotheses by statistical methods and coefficients appropriate for the evaluation of associations between nominal or dichotomic parameters: chi-square and Cramer’s V. For validation, PSPP statistical software was implemented.
Debunking the Myths of Vision and Mission Statements: A Content Analysis of FT Ranked Top 100 Business Schools
Authors: Siddiqui Kamran Ahmed
Published: July 2021

The purpose of this paper is to answer seven famous myths about vision and mission statements by analysing the vision and mission statements of FT Ranked Top 100 Business Schools in the world. First myth states that all business schools have both vision and mission statements. Second myth says both mission and vision statements are equal in length. Third myth states that all nine components must be present in all mission statements. Fourth myth assumes faculty is the hallmark of business school’s mission. Fifth myth states technology is at the centre stage of business school’s mission. Sixth myth assumes research is not part of business school’s mission. Finally, seventh myth says leadership is no more part of business school’s mission. FT ranking for Top 100 Business Schools was selected for this study and business school’s vision and mission statements were collected from their official websites. Content analysis was used as the major data analysis technique. Data analyses using descriptive statistics proved all seven myths wrong.
Peritonealdialyse in Zeiten von COVID-19: Geht eine Gefahr vom Dialysat aus?
Authors: Kraft Leonie , Latus Jörg
Published: July 2021

Nierenersatzverfahren wie die Peritonealdialyse (PD), die als Heimdialyseverfahren durchgeführt werden, haben sich während der SARS-CoV-2-Pandemie (SARS-CoV-2: „severe acute respiratory syndrome coronavirus 2“) zur Einhaltung eines „social distancing“ als vorteilhaft gegenüber der Zentrumsdialyse erwiesen. Dies resultiert in vergleichsweise weniger Infektionen und Hospitalisierungen bei PD-Patienten 1.