bluuebunny/crossref_metadata_2025 huggingface dataset:
Terahertz generation from surface of the bulk and monolayer tungsten diselenide
Authors: Khusyainov D. I. , Gorbatova A. V. , Buryakov A. M.
Published: December 2020

The study of ultrafast laser interaction with graphene-like materials based on transition metal dichalcogenides attracts most scientific groups. It is connected with potential use of these materials in flexible optoelectronic devices of visible and THz range. In this paper the parameters of generation of terahertz field from the surface of bulk layered crystal and monolayer film of tungsten diselenide are analyzed. Generation of terahertz radiation from the surface of experimental samples was studied by the terahertz time-domain spectroscopy in reflection geometry. Bulk layered crystals of tungsten diselenide were grown by gas transport reactions. Monolayers of tungsten diselenide crystals were grown by chemical vapor deposition on a silicon substrate. The bandwidth of the generated terahertz radiation from the surface of the bulk layered tungsten diselenide crystal was ~ 3.5 THz. For tungsten diselenide monolayer the spectrum bandwidth of the generated THz radiation was ~ 2.5 THz. The peak amplitude of the generated terahertz field for both samples was at a frequency of ~ 1 THz. Research of the influence of the angle of rotation of a polarization plane of optical femtosecond pump on peak-to-peak amplitude of the generated terahertz field from the surface of investigated samples was carried out. Symmetry analysis of the azimuthal dependence of THz radiation made it possible to separate the mechanisms of THz radiation and evaluate their contribution. The analysis results confirm that the only possible contribution to the generation of terahertz radiation in a tungsten diselenide monolayer crystal is the second order nonlinear optical effect – optical rectification. One of the contributions to the generation of tungsten diselenide is a nonlinear-optical effect of the third order – surface optical rectification.
Accounting of the magnetic field of the power supply system of a power-capacitive technical object
Authors: Tarlanov A. T. , Kurbanismailov Z. M.
Published: December 2020

The paper shows the approach and the result of taking into account the mutual influence of on-board subsystems of a complex technical object along the DC power supply circuits. Technical objects are understood as a mobile, energy-intensive vehicle, such as an aircraft, a surface or submarine vessel, or a railway locomotive with strong magnetic fields. The aim of the work is to create a simple and intuitive tool for mathematical modeling of the magnetic field vector at an arbitrarily specified observation point. The task is being solved in order to improve the accuracy of magnetic measurements on board, in particular, in navigation problems. On-board DC networks are considered, to which the approach of mathematical modeling is applied. The disadvantages of commercial programs of a similar purpose are noted. The binding of the objects under consideration to the general coordinate system is described. An analytical algorithm for calculating the magnetic field vector from the on-board cable network with a pronounced 3D trajectory is shown. Examples of visualization of the simulation results are given. An algorithm for calculating the induction vector based on the Biot-Savard law is considered. The algorithm for the analytical solution of the problem is described in detail. A specific power cable of the on-board network is considered. The cable is given by a set of straight conductors with current. The ways of future improvement of the created product with the transition from one observation point to the field map in a given three-dimensional zone of arbitrary position, volume and orientation are outlined. The obtained result is considered as an element of the procedure for achieving electromagnetic compatibility of energy-intensive and highly sensitive subsystems of a modern complex technical object.
Configuring adaptive PID-controllers of the automatic speed control system of the GTE
Authors: Chertilin K. E. , Ivchenko V. D.
Published: December 2020

For non-stationary objects with parameters, which could be changed significantly during operation, using conventional controllers in the form of proportional-integraldifferential regulators may not provide the required quality of the system. Therefore, it is desirable to create an adaptive automatic control system with the structure and parameters of the control regulator that are purposefully changed to ensure the system adaptation, that is based on information about the properties of the object of regulation and external influences, to the changing operating conditions. The problem of designing adaptive systems is one of the most important in control theory and related fields. This is conditioned by two factors: the complexity of solving the problem as a whole and the presence of a large number of technically diverse situations that need to be adapted and optimized. In the paper, an adaptive system for the automatic control of the speed of a gas turbine engine, which includes a magnetic amplifier, a DC motor with a gearbox, a fuel supply valve and a tachogenerator, is developed. For adaptive control execution, three proportional-integral-differential controllers were proposed: "classic", fuzzy and neurofuzzy. The parameters of the "classic" controller were optimized using linear programming methods. The membership functions and the rule base were proposed for the fuzzy controller. An adaptation algorithm was selected for the neuro-fuzzy controller. Three controllers were used for three engine-operating modes: low-gas, cruiser and maximum during the computer simulation of the system. A comparative analysis of the quality of the three regulators was performed and it is based on the obtained transient characteristics. The derived results can be used in the development of automatic control systems for gas turbine engines.
Diffraction of low-frequency waves on elastic thin-walled shells of rotation
Authors: Prikhodko V. Yu. , Do Vu Minh Thang .
Published: December 2020

Asymptotic and functional relations connecting the characteristics of scattered near and far fields with elastic and spectral characteristics of thin-walled elongated elastic shells described by the Love theory were found. The study was carried out by the method of two-scale expansions. For the near scattered field, recurrent systems of boundary value problems for Laplace and Poisson equations were obtained, the solutions of which were found explicitly. The radiation patterns of the scattered field were obtained using the theory of wave potentials for the Helmholtz equation. Asymptotic formulas for the potential densities of simple and double layers were found. This made it possible to present the asymptotics of the scattered field directivity diagram in the form of parametric integrals that depend on the angles of incidence and observation, frequency, surface shape, and material characteristics of the shell. The asymptotic method was effective for strongly elongated shells when the ratio of the maximum longitudinal diameter to the maximum diameter of rotation is more than ten. For such highly elongated bodies, the use of various difference and iterative schemes is problematic due to the difficulties of triangulating the shell surface. Numerical implementations of calculations of directional diagrams of a spheroidal steel shell in water at different angles of incidence of plane waves in a wide frequency range are given. The numerical calculations performed in this work are not tied to a specific frequency, since the geometric dimensions are given in wavelengths. Calculations have shown that the radiation pattern for elongated bodies begins to differ from the spherically symmetrical one at values kl > 4. When the wave size of the shell increases, the lobes of the directional diagram appear. The lobes direction depends on the above parameters. The number of lobes, their direction and power can be changed by using special distributions of the shell surface impedances.
Development of technology for controlling access to digital portals and platforms based on estimates of user reaction time built into the interface
Authors: Magomedov S. G. , Kolyasnikov P. V. , Nikulchev E. V.
Published: December 2020

The paper addresses the development of technology for controlling access to digital portals and platforms based on assessments of personal characteristics of user behavior built into the interface. In distributed digital platforms and portals using personal data, big data is collected and processed using specialized applications using computer networks. In accordance with the law, the data is stored on internal corporate servers and data centers. Special attention is paid to the tasks of differentiation and control of access in modern information systems. Wide availability and mass scale of services should be accompanied by more careful control and user verification. Access control to such systems cannot be ensured only through technologies and information security tools; efficiency can be increased through software and hardware architectural solutions. The paper proposes to expand the currently developing SIEM technology (Security information and event management), which combines the concept of security event management and information security management, with blocks of user behavior analysis. As a characteristic that can be measured without overloading communication channels and is independent of the type of device used, the psychomotor reaction time is proposed, measured as the performance of actions with the interface. A technological solution has been developed for implementation in a wide range of digital platforms: banking, medical, educational, etc. The results of experimental research using a digital platform of mass psychological research are presented. For the research, data from a mass survey were used when answering (in the form of a choice from the available options) to questions about the level of education. Analysis of the reaction time data showed the possibility of standardization and the same indicators of specific users when answering different questions.
Selection of location of radiators in a non-equivident antenna array
Authors: Legkiy N. M. , Mikheev N. V.
Published: December 2020

Antennas are one of the main elements of radio engineering systems. Phased antenna arrays (PAR), which make it possible to regulate the direction of radiation due to the ability to control the phases or phase differences of the emitted signal, are the most effective types of antennas. The size, design and shape of the PAR depend on the tasks to be solved, the type of emitters and the nature of their location. The article discusses the transformation of an equidistant PAR into a non-equidistant antenna array in order to reduce the level of side lobes and suppress diffraction maxima with a given minimum distance between the emitters. A model of a non-equidistant antenna array and calculation formulas for its analysis are presented. The method presented in the work based on iterative calculation methods makes it possible to select the main parameters of a non-equidistant PAR taking into account the bonds formed between neighboring radiating elements. The coordinates of the emitter elements of the non-equidistant PAR were calculated in a program using the MATLAB language. At the same time, a method was implemented to search for the optimal arrangement of emitters relative to each other, in which the directional pattern of the antenna array will have a minimum level of diffraction maxima and the required level of side lobe. According to the results of the program execution, the coordinates of the new non-equidistant PAR were obtained. The non-equidistant phased array antenna simulated according to the calculation results showed a complete absence of diffraction maxima, in contrast to the equidistant array, but it was not possible to sufficiently obtain the required level of side lobes. The calculated antenna radiation patterns presented for comparison showed the advantages of a non-equidistant antenn array.
Optimization of digital filters performances simultaneously in frequency and time domains
Authors: Smirnov A. V.
Published: December 2020

Wide used method of digital filters design consists in transformation of analog filter-prototype with required performances into digital filter. This method is applicable if the transformation preserves optimality of filter performances under specified set of quality indexes (QI). It was denoted earlier that such situation is possible when gain-frequency response (GFR) and phase-frequency response are optimized simultaneously. The task of simultaneous optimization of digital filters GFR and step response (SR) is also important but yet a little explored. Alternative method of this problem solving consists in search of digital filter transfer function (TF) which is optimal under GFR and SR QI’s. To investigate capabilities of the first method we found examples of analog filters Pareto-optimal under rise time and transient duration. Other QI’s of these filters fulfilled specified constraints. Then these filters were transformed into digital filters. Bilinear transformation and transformation with invariant impulse response were applied. Further we did the search of digital filters optimal under the same set of QI’s. In either method the hybrid heuristic algorithm was applied for search optimal solutions in the space of TF poles and zeroes coordinates. The results of investigation demonstrated that digital filters developed via search are superiorly under specified set of QI’s then digital filters developed via transformation of analog filters. Accordingly Pareto-optimality for QI of GFR and SR is not preserved during such transformation and direct search must be applied to optimized digital filters simultaneously in frequency and time domains. Further in some cases analog filters developed via reverse bilinear transformation of the found optimal digital filters are superiorly under the same set of QI’s then analog filters developed using search. In such cases using of digital filter-prototypes for design of analog filters is practical.
A simulation study of the forward and backward thermocapillary migration of fluids in a microchannel
Authors: Le Long Thanh , Nguyen Khuong Huu
Published: December 2020

In this study, the forward and backward thermocapillary migration of fluids in a microchannel is numerically investigated. Both the upper wall and the lower wall of the microchannel are set to be an ambient temperature. Two 40mW heat sources activated periodically are placed on the left side and the right side of the droplet in a microchannel. When the heat source is turned on, a pair of asymmetric thermocapillary convection vortices is formed inside the droplet. The isotherms inside the droplet are extremely distorted by the thermocapillary convection. The forward and backward thermocapillary migration results in the net thermocapillary momentum which drives a water droplet moves from the hot side of the open channel to the cold side. The temperature gradient at the free interface on the side of acting heat source is always smaller than that on the cold side. The actuation velocity of the liquid droplet first increases significantly, and then decreases continuously for various interval times. The dynamic contact angle of a water droplet is strongly affected by the forward and backward oil flow motion and the net thermocapillary momentum inside the droplet. It is alternated due to the pressure difference acting on the free interface between two immiscible fluids during actuation process.
Removal Of Microplastics In The Industrial Wastewater Via The Fe-Based Coagulation Process
Authors: Truong Nam Hai Ho , Tuyet Vy Nguyen , Thao Nguyen Nguyen , Thi Hien To
Published: December 2020

Currently, microplastics (MP) in the water environment is a global issue. Microplastics enter the natural environment through various sources such as domestic wastewater and industrial wastewater. The flocculation method - one of the simple and effective methods commonly used in wastewater treatment plants was used in this study to determine the removal efficiency of MPs in the industrial wastewater. The coagulation/flocculation experiments were carried on the Jartest model with the iron coagulant under different conditions. The wastewater was taken from the industrial park Song Than 1. The volume of the wastewater in each experiment was 500 mL with the MPs concentration of 78.4 mg/L which included 3 main forms with MP bead (322 different types / 0.5 L), MP fragment (131 different types / 0.5 L) and MP fiber (125 different types / 0.5 L). The optimal condition of microplastic removal (iron coagulant (FeCl3) = 600 mg/L, pH 8.6 – 8.8, settling time = 60 minutes, fast stirring of 300 rpm, slow stirring of 25 rpm, supporting-coagulant (CPAM) = 50 mg/L) was determined, corresponding with the MPs removal efficiency of 93.11% (MPs in effluent was 7.33 mg/L). The most common MPs categories collected after treatment were MP fragments (19 different types) and MP fibers (17 different types). MPs dimensions were mostly about 0.5 to 1 mm. Our result showed that the coagulation/flocculation process was an efficient method for the removal MPs in the industrial wastewater.
Practice regarding disposal of expired and unused medicines among students of University of Science, Vietnam National University Ho Chi Minh City
Authors: Thi Thuy Quyen Do , Hoang Minh Tran , Thi My Xuyen Phan , Thao Nguyen Nguyen
Published: December 2020

Expired and unused medicine can be mistakenly reused. This fact endangers the health, especially the elderly and young children. Currently, Vietnam has no regulations and guidelines on how to collect and dispose expired/unused medicines in households. Consequently, how expired/ unused medicines are disposed remain unknown. This study was conducted to investigate the students practice of disposing medicine. The survey was conducted in March 2020, using the "snowball" method on the social networks to spread the google form questionnaires to 525 students of University of Science. Survey results showed that 73.5% of students were keeping at least one unused over-the-counter drug at home while only 36.5% of students kept prescription drugs. The most common medications keeping unused at home are pain relievers and antipyretics (nonprescription groups) and antibiotics (prescription groups). Regarding the expired drugs, more than 80% of students said that they would throw away, nearly 10% keep at home, and 5% return to the pharmacy. For unwanted medicines, 70% of respondents keep at home, 20% will dispose and 15% will give to others. The most common way of the medicine disposal is to dispose together with the household solid waste. The study recorded that 84% students dispose medicines in household waste bin and 8% (likely living in rural area) burn with household solid waste. Disposing medicines with solid waste mean that the large amount of medicines would end up in the landfill. This raised a risk of groundwater contamination from the leachate in landfills. Nearly 80% of students participating in the survey believe that issuing and disseminating instructions for drug disposal and setting up collection points at hospitals and pharmacies is necessary. The study proposed a method to dispose of expired/unused medicines at
Designing the educational process based on virtual reality technologies
Authors: Shevchuk M. V. , Shevchenko V. G. , Zorina A. A.
Published: December 2020

The article discusses the use of virtual reality technologies in the school informatics course in teaching modeling. The greatest attention is paid to methodological recommendations for the elective course "Technologies of multidimensional modeling based on a virtual reality system for a smart home". In the classroom, students get acquainted with the basic concepts related to virtual reality, modeling objects and processes in 3D editors and based on a modern game engine. For students in the lesson, it is proposed to work with additive technologies on the example of studying a 3D printing device using virtual reality technology. Students participate in all stages of designing and developing a model in the cloud environment and then printing it on a 3D printer. Training within the elective course ends with a consideration of the basic concepts of the internet of things, the possibilities of augmented reality technologies in this area and the construction of a smart device using an educational kit.
New algorithms and formulas for calculation the volume of a ball and its surface area for the development of students' creative thinking and practical application
Authors: Zudin V. P.
Published: December 2020

The article presents new, more accurate algorithms and formulas for calculating the area of a circle, volume of a ball, surface area of a ball. To prove these algorithms and formulas and their practical application, programs have been developed in the Visual Basic for Application in Microsoft Word. These algorithms and formulas should be studied and applied in all educational institutions, as they are closer to the truth. From a more accurate calculation using these formulas, you can get an economic effect when calculating trajectories of movements in space, on the surface of the globe, in the construction and maintenance of products in the form of a circle or a ball. The study of this material in informatics lessons contributes to the development of students' creative thinking, increasing their motivation to study informatics and IT.
Conversion to binary number system of some types of ordinary fractions
Authors: Zlatopolski D. M.
Published: December 2020

The article describes a technique developed by the author for converting a number of ordinary fractions into a binary number system without intermediate conversion to decimal. The technique is generally applicable to two types of fractions: the denominator of which is 2n – 1 or 2n + 1, where n is a natural number, and also for denominator values 2, 4, 8, ... times greater than the indicated values. For fractions with a denominator of the form 2n + 1 and numerators equal to powers of two, an original technique is implemented during translation, which consists in using a conditional negative digit 1 (its designation: 1). The analysis showed that the developed method is more effective than the traditional one. A large number of examples are given and assignments for independent work of students are proposed.
Türk İşaret Dilinde Anlamsal Bağlantılığın ve Gösterimselliğin Sözlüksel Erişime Etkisi
Authors: MAKAROĞLU Bahtiyar
Published: December 2020

İşaretlenen diller üzerine yapılan çalışmalar, sözlüksel önceleme etkilerine ve belki de insan dilinin doğasının ne olduğu konusundaki bilgiye doğrudan bir etki oluşturabileceğini işaret etmektedir. Sözlüksel erişimi inceleyen son çalışmalar, dilsel bilginin zihinsel sözlükçede nasıl yapılaştığı ve bu sözlükçeye nasıl ulaştığı hakkında detaylı bilgi sunmaktadır. Bu çalışmada ise Türk İşaret Dilinde anlamsal bağlantılığın ve gösterimselliğin, sözlüksel erişim sürecine etkisi ve sözlüksel işlemleme hızı araştırılmaktadır. Katılımcılara SuperLab 5.0 programı yardımıyla birincil-gösterimsel hedef işaret çiftinden (örn. SİLGİ) oluşan ve ikinci işareti tanımayı amaçlayan çevrimiçi Sözlüksel Karar Testi uygulanmıştır. Birincil işaretler şu şekildedir: (i) gösterimsel ve anlamsal bağlantılı (örn. KALEMTRAŞ) (ii) gösterimsel olmayan ve anlamsal olarak bağlantılı (örn. ÖĞRENCİ) (iii) anlamsal olarak bağlantısız (örn. ÇATAL). Araştırmaya Türk işaret dili (TİD) anadili konuşucusu olan ve en az 10 yıldan beri günlük hayatında, Türkiye’deki Sağır toplumun parçası olan TİD ile bağlantısını olduğunu belirten 17 doğuştan sağır birey katılmıştır. Elde edilen bulgular, sözlüksel erişim sürecinde anlamsal bağlantılığın önemli derece kolaylaştırıcı etkisi olmasına karşın gösterimselliğin herhangi bir önceleme etkisini artırmadığını göstermiştir.
Politics of Harold Pinter’s Dystopian Drama: One for the Road and Party Time
Authors: ÖZMEN Özlem
Published: December 2020

This article discusses two of Harold Pinter’s political plays, One for the Road and Party Time as examples of dystopian drama which criticise the contextual background of 1980s Turkey and 1990s Britain respectively. This reading illustrates that dystopian images observed in Harold Pinter’s political plays, One for the Road and Party Time are used as responses to certain socio-historical problems of two different locations. While the panorama of a military state in One for the Road provides a criticism of the political atmosphere of Turkey following the 1980 coup, the economically unbalanced and depoliticised society presented in Party Time resonates with the socio-economic inequality of Britain during the Thatcher and Major periods. Unspecified settings of the plays, ambiguous characterisation, and hierarchical social structures presented in these works are viewed among the dystopian elements which help Pinter criticise the political atmosphere of Turkey following the 1980 coup and the unbalanced socio-economic background of contemporary Britain. Discussing dystopian narrative elements – that are commonly studied in relation to the novel genre – in relation to dramatic texts offers the idea that although there is no reference to particular states or political figures in these plays, dystopian elements such as totalitarian regime and state violence derive their material from the real events of the two countries. By way of this dystopian perspective, it is aimed to discuss the necessity of observing the close relationship between Pinter’s plays and their historical background despite their seeming distance from their political milieux. A reading of Pinter’s works with an emphasis on their dystopian images also helps to interpret Pinter’s detached attitude to the politics of his plays from an alternative perspective.
PENGARUH MODEL PEMBELAJARAN PROBLEM POSING TERHADAP HASIL BELAJAR MATEMATIKA PESERTA DIDIK KELAS X SMK NEGERI 3 JOMBANG
Authors: Amanah Dewi , Fikrati Ama Noor
Published: December 2020

Model pembelajaran yang akan disampaikan oleh guru mempengaruhi hasil belajar peserta didik. Dalam proses memperoleh hasil belajar yang baik diperlukan model pembelajaran yang tepat. Guru perlu memberikan kebebasan kepada peserta didik untuk berpikir secara bebas, kreatif dan belajar mandiri. Penelitian ini bertujuan untuk mengetahui ada atau tidaknya pengaruh terhadap hasil belajar matematika peserta didik kelas X SMK Negeri 3 Jombang sebelum dan sesudah diterapkan model pembelajaran problem posing tahun pelajaran 2019/2020 pada materi barisan dan deret aritmatika. Penelitian ini merupakan penelitian kuantitatif dengan menggunakan rancangan penelitian “One-Group Pretest-Posttest Design”. Populasi dalam penelitian ini adalah peserta didik kelas X SMK Negeri 3 Jombang dengan sampel penelitiannya yaitu kelas X TKJ 2 tahun pelajaran 2019/2020 semester genap yang berjumlah 30 peserta didik. Metode pengumpulan data yang digunakan dalam penelitian ini adalah metode tes. Instrumen yang digunakan adalah lembar tes hasil belajar matematika yang berbentuk uraian. Kesahihan instrumen penelitian ini diperoleh melalui uji validitas dan reliabilitas. Teknik analisis data dilakukan dengan uji normalitas dan uji hipotesis menggunakan program SPSS 20.0. Berdasarkan hasil penelitian yang sudah terkumpul dan sudah dianalisis, diperoleh nilai sig.(2-tailed) pada Paired Samples T Test sebesar 0,000 yang artinya nilai sig.(2-tailed) < α yaitu 0,000 < 0,05 maka H0 ditolak dan H1 diterima. sehingga dapat disimpulkan bahwa ada pengaruh terhadap hasil belajar matematika peserta  didik kelas X SMK Negeri 3 Jombang sebelum dan sesudah diterapkan model pembelajaran problem posing tahun pelajaran 2019/2020 pada materi barisan dan deret aritmatika.Kata kunci: : Pengaruh, Problem Posing, Hasil Belajar
PENERAPAN MODEL PEMBELAJARAN PROBLEM BASED LEARNING TERHADAP HASIL BELAJAR MATEMATIKA SISWA KELAS VIII MTs MIDANUTTA’LIM JOGOROTO JOMBANG
Authors: Irianto Septian Putra , Qomariyah Umi Noer
Published: December 2020

Model pembelajaran adalah suatu rencana atau pola yang dirancang untuk mencapai tujuan pembelajaran. Salah satu model pembelajaran yang digunakan dalam pembelajaran ini adalah model pembelajaran Problem Based Learning. Tujuan penelitian ini adalah untuk mengetahui ada tidaknya pengaruh model pembelajaran Problem Based Learning terhadap hasil belajar matematika siswa dan untuk mengentahui respon siswa terhadap model pembelajaran Problem Based Learning. Jenis penelitian yang digunakan adalah penelitian kuantitatif dengan metode eksperimen dengan desain True Eksperiment Design  bentuk  posttest – only control design. Sampel dalam penelitian ini adalah kelas VIII-B sebagai kelas eksperimen dan kelas VIII-D menjadi kelas kontrol. Dalam penelitian ini instrumen yang digunakan berupa lembar tes untuk mengetahui hasil belajar matematika siswa dan lembar angket untuk mengetahui respon siswa setalah pembelajaran Problem Based Learning. Pengujian hipotesis pada penelitian ini dengan menggunakan uji independent sample test. Berdasarkan hasil uji hipotesis diperoleh nilai sig sebesar 0,004. Hal ini berarti nilai probabilitas sig , maka  ditolak dan  diterima. Sehingga dapat disimpulkan ada pengaruh model pembelajaran Problem Based Learning terhadap hasil belajar matematika siswa kelas VIII MTs Midanutta’lim Jogoroto Jombang. Berdasarkan hasil analisis angket respon siswa dapat disimpulkan bahwa dari 21 siswa yang mengisi angket, rata-rata persentase respon siswa terhadap semua aspek berada diatas 80%. Artinya setiap aspek direspon positif oleh siswa kelas VIII MTs Midanutta’lim Jogoroto Jombang.Kata kunci: Model Pembelajaran Problem Based Learning, Hasil Belajar Matematika
Removal of Lead and Zinc in Wastewater Applying Activated Carbon: A Review of Articles [Remoción de plomo y zinc en aguas residuales mediante la aplicación de carbón activado: revisión de artículos]
Authors: Valverde Flores Jhonny
Published: December 2020

The objective of the investigation was to review the bibliography of articles referring to the elimination of Lead and Zinc in wastewater by applying activated carbon. The results indicate that the walnut achieves better results for the removal of lead and the apple pulp will achieve better results for the removal of zinc
Polydiethylsiloxane Macroinitiators for the Synthesis of Block Copolymers
Authors:   Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, ul. Profsoyuznaya 70, Moscow, 117393 Russia, Obrezkova M. A. ,   Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia, Selezneva E. V. ,   Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia,   DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH-Aachen University, Forckenbeckstraße 50, D-52074 Aachen, Germany, Demchenko N. V. ,   Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, ul. Profsoyuznaya 70, Moscow, 117393 Russia, Möller М. ,   Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia,   DWI-Leibniz-Institute for Interactive Materials, e.V., RWTH-Aachen University, Forckenbeckstraße 50, D-52074 Aachen, Germany, Kotov V. M. ,   Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia
Published: December 2020

α-Butyl-ω-(lithiumoxy)oligodiethylsiloxane and α,ω-dipotassiumoxypolydiethylsiloxane are synthesized by the anionic polymerization of hexaethylcyclotrisiloxane in the presence of n-BuLi or KOH, respectively. The mono- and bifunctional polydiethylsiloxane macroinitiators are derived from the reactions of α-butyl-ω-(lithiumoxy)oligodiethylsiloxane and α,ω-dipotassiumoxypolydiethylsiloxane with chloro(dimethyl)-(4-chloromethylphenylethyl)silane. The resulting polydiethylsiloxane macroinitiators can be used for the synthesis of di- and triblock copolymers.
Distributed Intelligence at the Edge on IoT Networks
Authors: Alam Tanweer , Rababah Baha , Ali Arshad , Qamar Shamimul
Published: December 2020

The Internet of Things (IoT) has revolutionized innovation to collect and store the information received from physical objects or sensors. The smart devices are linked to a repository that stores intelligent information executed by sensors on IoT-based smart objects. Now, the IoT is shifted from knowledge-based technologies to operational-based technologies. The IoT integrates sensors, smart devices, and a smart grid of implementations to deliver smart strategies. Nowadays, the IoT has been pondered to be an essential technology. The transmission of information to or from the cloud has recently been found to cause many network problems to include latency, power usage, security, privacy, etc. The distributed intelligence enables IoT to help the correct communication available at the correct time and correct place. Distributed Intelligence could strengthen the IoT in a variety of ways, including evaluating the integration of different big data or enhancing efficiency and distribution in huge IoT operations. While evaluating distributed intelligence in the IoT paradigm, the implementation of distributed intelligence services should take into consideration the transmission delay and bandwidth requirements of the network. In this article, the distributed intelligence at the Edge on IoT Networks, applications, opportunities, challenges and future scopes have been presented.
Hybrid Cloud SLAs for Industry 4.0: Bridging the Gap
Authors: Dhirani Lubna Luxmi , Newe Thomas
Published: December 2020

Hybrid Cloud Service Level Agreements (SLA) comprises of the legal terms and conditions for the cloud contract. Even though all the service level objectives, metrics and service descriptions are clearly outlined in the cloud SLA contract, sometimes vendors fail to meet the promised services and confusing terms lead to tenant-vendor cloud legal battles. Hybrid Cloud involves two different cloud models (public and private) working together, applications running under the hybrid cloud are subject to different availability sets, functionality and parameters developing SLA complexity and ambiguity. The new manufacturing environment (Industry 4.0 concept) is based on a fully connected, intelligent and automated factory, which will highly be dependent on cloud computing and IoT-based solutions for data analytics, storage and computational needs. In situations where Hybrid cloud services are not defined and managed properly may result in Industrial-IoT data security issues leading to financial and data losses. This paper discusses various aspects of the cloud service level agreement in Industry 4.0 for better understanding and implementation and puts a light on the issues that arise out of imprecise statements.
Percepción docente sobre la educación a distancia en tiempos de COVID-19
Authors: Santos Vanessa , Villanueva Inés , Rivera Edith , Vega Emilio
Published: December 2020

INTRODUCCIÓN. La pandemia Covid-19 ha obligado a las instituciones educativas de todo el mundo a cambiar su modalidad de enseñanza, y pasar de un modelo mayormente presencial a otro donde la virtualidad presenta mayor protagonismo. OBJETIVO. Conocer la percepción de los docentes acerca de la educación a distancia durante la pandemia Covid-19 en una institución educativa estatal de Lima, Perú. MÉTODO. Estudio descriptivo transversal, con una muestra de 53 docentes en quienes se aplicó un cuestionario de 36 ítems, adaptación del Cuestionario de Educación a Distancia en tiempo de Covid-19 para docentes. RESULTADOS. Existe una experiencia media en formación a distancia (77,4%), falta de uso de plataformas educativas (67,9%) y uso masivo de WhatsApp como medio de comunicación (94,3%). El papel de las familias presentó menor calificación en comparación con el papel de la administración educativa y del centro escolar, resaltando el poco apoyo de los padres de familia y la falta de medios para desarrollar actividades virtuales. Asimismo, los docentes perciben una inadecuada formación en competencia digital. DISCUSIÓN Y CONCLUSIONES. Los docentes perciben muchas dificultades en la educación a distancia, especialmente por parte de los padres de familia y la poca formación adquirida.
Characterization of a bacteriophage from urban sewage obtained with the bacterium Staphylococcus aureus
Authors: Costa Anderson Luiz Pena da , Souza Antonio Carlos Freitas , Resque Rafael Lima
Published: December 2020

Bacteriophages are viruses of bacteria that have received significant attention in the last decades due to their potential as an alternative to the antibiotics, as well as their applicability in the selective control of bacterial species harmful to food. In this context, this work reports the partial results of a viral filtrate named P4CSa that was obtained with the bacterium Staphylococcus aureusand characterized by the viral host range and the restriction fragment length polymorphism technique. The results indicate that the phage P4CSa probably belongs to the order Caudovirales, it presents a polyvalent host range, and it can be preserved for the long term in the form of filtrated lysates stored at 4°C, suggesting that the phage P4CSa may have the potential for the development of a pharmaceutical product indicated for the biocontrol of pathogenic bacteria.

Stamford Journal of Microbiology, Vol.10 (1) 2020: 20-24
DISEÑO INTERIOR DE AULAS EDUCATIVAS PARA EL APRENDIZAJE COLABORATIVO
Authors: León J. Daniel , Delgado Giovanny
Published: December 2020

El presente proyecto de investigación original tiene como objetivo proponer y resolver un sistema de diseño interior educativo a partir del aprendizaje colaborativo, como génesis de una metodología educativa contemporánea, relacionando distintas disciplinas; con el fin de introducirlas al campo del diseño interior se propone un proyecto interdisciplinar, con innovaciones tecnológicas y conceptuales de forma y uso. Desde el área de la pedagogía se tomó como modelo educativo contemporáneo al trabajo colaborativo que, en función de criterios y condicionantes de diseño, sea eje de ruptura con el sistema tradicional educativo, utilizándolo como guía para la propuesta de diseño interior educativo. Se tomó como referencia una serie de fuentes bibliográficas académicas y científicas que permitan estructurar un sistema crítico y relacional de diseño para operar el proyecto del diseño interior creando relaciones innovadoras entre las nociones de aula y sus elementos espaciales en: pisos, cielorrasos, mobiliario, iluminación, paredes y equipamiento educativo.Palabras clave: Espacios educativos contemporáneos, heurística del diseño, innovación espacial, interdisciplinariedad, sistema de diseño.

AbstractThe present research project pretends to solve an educational interior design system based on collaborative learning, as the genesis of a contemporary educational methodology by relating different disciplines. In order to introduce them to the field of interior design, an interdisciplinary project was proposed, with technological and conceptual innovations of form and use. From the area of pedagogy, collaborative work was taken as a contemporary educational model that, based on criteria and design conditions, underpinned the rupture with the traditional educational system, which worked as a guide for the educational interior design proposal. A series of academic and scientific bibliographic sources were taken as a reference that allow the structuring of a critical and relational design system to operate the interior design project, creating innovative relationships between the notions of the classroom and its spatial elements in: floors, ceilings, furniture, lighting, walls and educational equipment.Keywords: Contemporary educational spaces, design heuristics, spatial innovation, interdisciplinarity, design system.
EL DISEÑO DE INTERIORES Y SU RELACIÓN CON EL CAMPO DE LA ARQUITECTURA
Authors: Delgado Giovanny
Published: December 2020

La búsqueda discursiva de la institucionalización del diseño de interiores nos lleva a analizar el campo del hábitat en el que la arquitectura se ha convertido en la disciplina rectora, así, el diseño de interiores aparece como una especie de entropía. En la Teoría de los Campos de Bourdieu el diseño se "entromete" en términos de transformación y reconfiguración de ese campo, donde su emergencia no implica, necesariamente, la destrucción de las premisas disciplinares; más bien, la nueva disciplina emerge como un proceso inherente a la deconstrucción revolucionaria de la aparición de nuevas y novedosas formas, mecanismos, configuraciones y estructuras mismas, analizando, revisando y reinterpretando el fondo.

Palabras clave: Teoría de los Campos de Bourdieu, habitus, nomos, metáfora, juego, especificidades, preparación académica.

AbstractThe discursive search for the institutionalization of interior design leads us to analyze the field of habitat in which architecture has become the guiding discipline. Interior design appears as a kind of entropy. In Bourdieu's Field Theory, design "intrudes" in terms of transformation and reconfiguration of that field, where its emergence does not necessarily imply the destruction of disciplinary premises. Rather, the new discipline emerges as a process inherent to the revolutionary deconstruction of the appearance of new and novel forms, mechanisms, configurations and structures themselves, analyzing, revising and reinterpreting the background.

Keywords: Bourdieu Fields theory, habitus, nomos, metaphor, game, specificities, academic preparation.
CRECIMIENTO URBANO EN LA PRODUCCIÓN DE VIVIENDA FORMAL DEL SIGLO XX
Authors: Durán   Gabriela
Published: December 2020

El presente artículo reúne los diferentes enfoques modernos y posmodernos sobre las formas de crecimiento urbano a partir de la producción de vivienda formal. De esta manera, se aborda un estudio de la ciudad según la mirada funcionalista (CIAM) que vincula a la ciudad como una máquina y una producción en serie. Además, se continúa reflexionando sobre la mirada humanista con la aparición de la escuela italiana, que reconoce a la ciudad como romántica, y más adelante, como desarrollo de estas dos primeras. Estos fundamentos teóricos del siglo XX posibilitan una reflexión crítica acerca de los aspectos urbanos más relevantes a la hora de producir ciudad en la actualidad.Palabras clave: Crecimiento urbano, teoría funcionalista, teoría humanista, producción de vivienda.

AbstractThis article brings together the different modern and postmodern approaches to the forms of urban growth based on the production of formal housing. In this way, the study of the city is approached according to the functionalist perspective (CIAM) that links the city as a machine and a serial production. In addition, it continues reflecting on the humanist stance with the appearance of the Italian school, which recognizes the city as romantic, and later, as a development of the first two. These theoretical foundations of the twentieth century allow a critical reflection on the most relevant urban aspects when producing the city today.Keywords; Urban growth, functionalist theory, humanist theory, housing production.
Modelo de Gestión para la Internacionalización de Artesanías en el Azuay. Caso específico: Macana Ikat Gualaceo
Authors: Abril Ximena , Velez Carlos , Yungasaca Belén
Published: December 2020

Como respuesta a la ausencia de conocimiento técnico e investigativo en materia comercial y artesanal para las artesanías ecuatorianas, se busca desarrollar un modelo de competitividad, gestión y comercialización de la macana Ikat de Gualaceo, capaz de adaptarse a cualquier otra artesanía ecuatoriana que garantice mejoras en el modelo económico actual del país. A través de los principios de mejora continua, planeación estratégica y propuesta de valor se diseñan los procesos de: gestión, producción, financiación, comercialización y talento humano, a base de teorías científicas desarrolladas para las Pequeñas y Medianas Empresas (PYMES), aplicadas a las artesanías. Además, se describen, esencialmente, contribuciones y postulados de investigación, que argumentan la rentabilidad de este modelo en el mercado internacional. Esta investigación obtuvo eficientes resultados en todos los campos de estudio, evidenciados en proyecciones estadísticas sobre la comercialización de las macanas Ikat como bien de gama alta, la maximización de las ganancias con altos niveles de rentabilidad, el reconocimiento del talento artesanal como generador de apropiación cultural; y, como eslabón prioritario dentro de la cadena de valor y producción de la industria nacional. Palabras clave: artesanía, Ikat, internacionalización, macana, modelo de gestión.

Abstract:In response to the absence of technical and research knowledge in commercial and artisanal matters for Ecuadorian handicrafts, it seeks to develop a model of competitiveness, management and commercialization of the macana Ikat of Gualaceo, capable of adapting to any other Ecuadorian handicraft that guarantees improvements in the current economic model of the country. Through the principles of continuous  mprovement, strategic planning and value proposition, the processes of management, production, financing, commercialization and human talent are designed, based on scientific theories developed for SMEs, applied to handicrafts. In addition, contributions and research postulates are essentially described, which argue the profitability of this model in the international market. This research obtained efficient results in all the fields of study evidenced in statistical projections on the commercialization of the macanas Ikat as a luxury good, the maximization of profits, with high levels of profitability; the recognition of artisanal talent as a generator of cultural appropriation and priority link within the value and production chain of the national industry. Keywords: crafts, Ikat, internacionalization, macana, management model.