bluuebunny/crossref_metadata_2025 huggingface dataset:
MODELING OF THE MANUFACTURING SYSTEMS STATE IN THE CONDITIONS OF THE LEAN PRODUCTION
Authors:   Sumy State University, Ministry of Education and Science of Ukraine, Sumy, Ukraine, DYADYURA KONSTANTIN , HREBENYK LIUDMYLA ,   Sumy State University, Ministry of Education and Science of Ukraine, Sumy, Ukraine, KRENICKY TIBOR ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Slovakia, ZABOROWSKI TADEUSZ ,   Polish Academy of Sciences Branch in Poznan, Poland
Published: May 2021

This article investigates the hierarchy of the manufacturing system, which consists of a set of interrelated processes aimed at converting information, knowledge, energy, materials, and other resources into value for the consumer based on the principles of lean production. Modern manufacturing systems are becoming more and more complex to manage. The problems that need to be solved are associated with a significant number of time-varying parameters, large time delays, high non-linearity of processes, and a complex relationship between input and output parameters. Depending on the parameters of internal components and characteristics of external conditions, the state of manufacturing systems can change in an unpredictable manner. The paper considers many types of discrete states in which the system can be. The estimation of the probability of finding the manufacturing system in any of the given states was carried out using discrete Markov analysis. The article also presents the results of studies of possible transitions between states in which the production system is presented in the form of a transition matrix.
APPLICATION OF SPEED AND SEPARATION MONITORING TECHNIQUE AT AUTOMATED ASSEMBLY PROCESS
Authors:   Technical University of Kosice, Faculty of Mechanical Engineering, Department of Automation and Human-Machine Interactions, Slovakia, VAGAS MAREK , GALAJDOVA ALENA ,   Technical University of Kosice, Faculty of Mechanical Engineering, Department of Automation and Human-Machine Interactions, Slovakia
Published: May 2021

The realization and implementation of a collaborative robotic system in the automotive industry has many advantages in productivity, product quality, and worker ergonomics, but worker safety aspects play a crucial role in these activities. This paper presents the results of ongoing research into developing an automated workplace for an assembly of industrial limit switches based on the cooperation between human and robotic systems. Operating speed and worker-robot separation monitoring methodology (SSM) was used as one of the available methods to reduce the risk of injury according to the technical specification ISO 15066 on collaborative method sharing space with humans. The virtual environment simulation aims to determine the SSM algorithm’s parameters to estimate the minimum protective distance between the robot and the operator. The cooperation between the human and the robot and the safety issues specified by the SSM system assumed operational safety and reduced the operator fatigue during the assembly process.
SIMULATION MODELING OF THE CZECH REPUBLIC ECONOMY WITH A DEVELOPMENT FORECASTING
Authors:   Institute of Control and Informatization of Production Processes, Faculty of Mining, Ecology, Process Control and Geotechnologies, Technical University of Kosice, Kosice, Slovakia, GRESOVA ELENA , SVETLIK JOZEF ,   Department of Manufacturing Machinery and Robotics, Faculty of Mechanical Engineering, Technical University of Kosice, Kosice, Slovakia
Published: May 2021

The current uncertain and rapidly changing time requires a thorough analysis of the actual situation and subsequent appropriate decision-making in many areas. This applies to the individual national economies and their particular sectors, as well. Therefore, the topic of development forecasting is becoming even more important nowadays. The presented paper deals with forecasting associated to the further development of the selected national economy through modeling via simulation technique. The country of selection is the Czech Republic. The gross domestic product (GDP) is chosen as the indicator that the most reliably reflects the national economy condition. Therefore, a prediction of the potential GDP development is realized. The obtained findings are applied to the industry segment.
PYROLYTIC RECOVERY AS A PROSPECTIVE USE OF PLASTIC WASTE MATERIALS
Authors:   Department of Chemistry and Chemical Technologies, Faculty of Wood Sciences and Technology,Technical University in Zvolen, Zvolen, Slovak Republic, CABALOVA IVETA , GEFFERTOVA JARMILA ,   Department of Chemistry and Chemical Technologies, Faculty of Wood Sciences and Technology,Technical University in Zvolen, Zvolen, Slovak Republic, BUBENIKOVA TATIANA ,   Department of Chemistry and Chemical Technologies, Faculty of Wood Sciences and Technology,Technical University in Zvolen, Zvolen, Slovak Republic, KRILEK JOZEF ,   Department of Environmental and Forestry Machinery, Faculty of Technology,Technical University in Zvolen, Zvolen, Slovak Republic
Published: May 2021

Prospective use of plastic material components resulting from their pyrolytic recovery is presented in the paper. Selected plastic waste materials (PE, PP, PS) were evaluated using modern analytical method GS-MS after the low-temperature pyrolysis. The low-temperature pyrolysis shows that the sample of PS was well-suited to this application and this recovery is important in the case of all three samples as well. The presence of 26 substances with 1-Hexene (13.72%) was observed in the case of pyrolysis products, specifically PE. When investigating PP, 36 substances with the highest content of 2.4-Dimethyl-1-heptene (38.35%) were defined. 20 substances containing especially Styrene (79.97%) were determined as the major products of PS pyrolysis. Moreover, using the GC-MS analysis, it was found out that chemical compounds present in all samples could be further recovered. The possibility of using the pyrolysis to recover the plastic waste materials in order to protect the environment is necessary.
DEVELOPMENT OF A PARALLEL GRIPPER WITH AN EXTENSION NAIL MECHANISM USING A METAL BELT
Authors:   Toshiba Corporate Research and Development Center, TANAKA JUNYA , MATSUHIRA NOBUTO ,   Department of Engineering Science and Mechanics, Shibaura Institute of Technology
Published: May 2021

Aiming to expand the range of applications for parallel grippers, we propose an extension nail mechanism that can be mounted on a parallel gripper. We also propose an extension nail mechanism comprising a stainless steel belt, two transport belts, a triangular nail, and a drive unit. The triangular nail is connected to one end of the stainless steel belt, and the drive unit is connected near the other end. We achieve smooth sliding of the nails underneath objects by arranging the transport belts on either side of the stainless steel belt. By elastically winding one end of the stainless steel belt and each of the transport belts, the nail mechanism can be miniaturized while achieving large expansion and contraction. We achieve stable grasping operations by using the extension nail mechanism of the parallel gripper in accordance with the flexibility of the object.
A TEORIA DE OPÇÕES REAIS NA GESTÃO DE INVESTIMENTOS NA INDÚSTRIA 4.0: UM ESTUDO DE CASO
Authors: Heidrich Felipe , Morais Diogo Martins Gonçalves de , Facó Júlio Francisco Blumetti
Published: May 2021

Com a finalidade de validar uma metodologia para avaliação de projetos de investimentos caracterizados como indústria 4.0, o presente estudo propõe a aplicação da Teoria das Opções Reais como ferramenta de análise de investimentos em um projeto aderente a esse contexto, aplicada a um estudo de caso real de fabricação de rolamentos de grande porte em uma indústria paulista. A partir dos resultados reais dessa aplicação, é possível concluir que a metodologia utilizada das opções reais se mostrou eficiente na mitigação de riscos e flexibilização gerencial na tomada de decisão no estudo de caso apresentado.
GERENCIAMENTO DE RESULTADOS POR DECISÕES OPERACIONAIS NO NOVO MERCADO DO BRASIL: UMA ANÁLISE DA INFLUÊNCIA DE AUDITORIAS BIG FOUR E NÃO BIG FOUR
Authors: Sena Thiago Rios , Dias Filho José Maria , Moreira Nayara Batista
Published: May 2021

Este estudo objetiva verificar a existência de diferenças no nível de gerenciamento de resultados por decisões operacionais nas companhias abertas brasileiras quando auditadas por Big Four ou não Big Four. A amostra de dados apresenta 515 observações para o período de 2012 a 2017, sendo 465 empresas-ano auditadas por Big Four e 50 por não Big Four. A literatura atual aponta a auditoria como um fator inibidor para o gerenciamento de resultado, sendo assim, as hipóteses de pesquisa foram elaboradas a partir desse pressuposto, mas atribuído para o gerenciamento por decisões operacionais. Foi utilizado o modelo proposto por Roychowdhury (2006) para identificar o gerenciamento de resultado através do nível anormal de fluxo de caixa operacional, despesas com vendas, gerais e administrativas e de produção. Os modelos foram operacionalizados através do método dos mínimos quadrados generalizados e os resultados encontrados revelam que o fato da firma de auditoria pertencer ao grupo Big Four não implica em diferença no nível de gerenciamento de resultados por decisões operacionais, seja através de fluxo de caixa operacional, despesas de venda, gerais e administrativas ou produção.
Helyzetkép a magyarországi közösségi gazdaság kulcsszereplőiről : A koronavírus válság „vesztesei" és „nyertesei” egy speciális munkaerőpiaci szegmensben
Authors: Simonovits Borbála , Surányi Ráchel , Csajbók-Veres Krisztina
Published: May 2021

A közösségi vagy más néven megosztáson alapuló gazdaság körébe sorolható szervezetek világszerte és Magyarországon is egyre nagyobb teret nyernek. Hiánypótló kutatásunkban a közösségi gazdaság és fogyasztás különböző platformjait vizsgáljuk azzal a céllal, hogy feltárjuk ezen platformok magyarországi működési módjait, főbb szektoriális jellegzetességeit. Kiemelten vizsgáltuk továbbá a koronavírus-válság (COVID-19) hatását ebben a sok szempontból speciális piaci szegmensben. Mivel feltételezéseink szerint a koronavírus-válság jelentős mértékben és eltérően hatott az európai és így a magyarországi közösségi gazdaság „kulcsszereplőire”, a 2019-ben készült 15 szakértői interjút kiegészítettük 12 utánkövetéses interjúval 2020 tavaszán. Kvalitatív kutatásunk rámutatott, hogy a 2020 márciusi határlezárásokat és egyéb korlátozások követően hirtelen kialakult keresleti sokk nagyon súlyosan érintette az utazási és szállásadási szektort. A megosztáson alapuló közlekedés tekintetében összetettebb a kép: míg a közbringa iránti kereslet fellendült, addig a piaci alapú roller- és autó- és utazásmegosztók népszerűsége csökkent. Ugyanakkor a vírusválság hatására a társadalmi szolidaritás szerepe megnőtt, ezzel növelve a különböző segítségnyújtásra épülő platformok aktivitását (pl. Miutcánk) illetve ételmegosztásra illetve házhozszállításra épülő szervezetek (pl. Nekedterem) forgalma is nőtt a vizsgált időszakban. A szomszédsági platformok esetében árnyaltabb a kép: míg az elsősorban online felületen működő és csak egy-egy személy találkozását igénylő platformok (pl. Miutcánk) megnövekedett felhasználói aktivitást és más szervezetekkel való együttműködést tapasztaltak, addig a kisebb közösséget érintő, de több embert mozgósító szerveződések (pl. Garázsvásár) fel kellett, hogy függesszék a tevékenységüket. A munka- és irodamegosztásra épülő közösségek a 2020 tavaszi karantén időszakban részben vagy teljesen be kellett, hogy zárjanak, illetve új, online módon is megvalósítható stratégiák kidolgozására kényszerültek (pl. ClickforWork).
Technical Features of the Computing and Geo-Information System for Research of Prospective Interstate Power Grid Expansion
Authors:   Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia, Podkovalnikov Sergei V. , Trofimov Ivan L. , Trofimov Leonid N.
Published: May 2021

The purpose of this paper is to present opportunities and technical features of the developed software for study of prospective Interstate Power Grid (ISPG) expansion in Northeast Asia. The mathematical model for optimization of power systems expansion and operating modes, which is the main part of the computing & geo-information system (CIS), is used. In this model, a linear optimization method is used to find optimal installed capacities by generation type mix; optimal electric ties transfer capabilities and operating modes for each electric power system in the ISPG. Annualized costs of the ISPG expansion as a whole are the value of the objective function. The obtained results of the model in tabular, graphic and cartographic forms are presented. Examples of the CIS usage for study of different scenarios of ISPG expansion in the Northeast Asia are shown.
Simple Adaptive Rectifier with High Efficiency over a Range of 21 dBm Input Power for RF Energy Harvesting Applications
Authors:   Benha Faculty of Engineering/Electrical Department, Benha, Egypt, Abdelhady Eman M. , Abdelkader Hala M. , Al-Awamry Amr A.
Published: May 2021

This paper presents a novel simple adaptive and efficient rectifier for Radio Frequency (RF) energy harvesting applications. Traditional rectifiers have maximum RF-DC Power Conversion Efficiency (PCE) over a narrow range of RF input power due to diode breakdown voltage restrictions. The proposed adaptive design helps to extend the PCE over a wider range of RF input power at 2.45GHz using a simple design. Two alternative paths arecontrolled depending on the RF input power level. Low input power levels activate the first path connected to a single rectifier; low power levels make the diode operate below its breakdown voltage and therefore avoiding PCE degradation. High input power levels activate the second path dividing it into three rectifiers. This keeps input power at each rectifier at a low power level to avoid exceeding the diode break down voltage. Simulated PCE of this work is kept above 50% over a range of 21.4 dBm input power from -0.8dBm to 20.6dBm.
Comparative Analysis of V-Band and E-Band mmWaves for Green Backhaul Solutions for 5G Ultra-Dense Networks
Authors:   PAN African University, Institute of Basic Sciences, Technology and Innovation (PAUISTI), Nairobi, Kenya, Ajani Ayodeji A. , Oduol Vitalice K. , Adeyemo Zachaeus K. , Awasume Ebude C.
Published: May 2021

5G Ultra-Dense Networks (UDNs) will involve massive deployment of small cells which in turn form complex backhaul network. This backhaul network must be energy efficient for the 5G UDN network to be green. V-band and E-band mmWave technologies are among the wireless backhaul solutions tipped for 5G UDN. In this paper, we have compared the performance of the two backhaul solutions to determine which is more energy efficient for 5G UDN. We first formulated the problem to minimize power, then proposed an algorithm to solve the problem. This was then simulated using Network simulator 3.The first scenario made use of V-band mmWave while thesecond was E-band mmWave. The performance metricsused were power consumption and energy efficiency againstthe normalized hourly traffic profile. The performances ofthe two solutions were compared. The results revealed thatE-band mmWave outperformed V-band mmWave inbackhauling traffic in 5G UDN. It can be concluded that E-band green backhaul solution is recommended over V-bandmmWave for 5G UDN.
Optimal Energy Management of a Double-Tracking Grid-Connected Photovoltaic with Battery System for a Microbrewery
Authors:   Dept. of Electrical, Electronic and Computer Engi., Central University of Technology, Bloemfontein, South Africa, Kusakana Kanzumba
Published: May 2021

Currently, the production of craft beer in microbreweries has become very popular. This craft beer production process is energy intensive due heating and cooling equipment involved. Most of these breweries are classified as commercial loads which are subjected to the applicable commercial time-of-use tariff from the utility company. Renewable energy sources can also be used to assist the breweries in reducing their reliance on the energy from the grid. However, these systems show a common disadvantage of not always meeting the energy demand during the periods where the resources are not available. In this paper, an optimal energy management model of a 5 kWp grid-connected photovoltaic, using a double tracking system with battery storage, is proposed to reduce the microbrewery’s reliance on the grid. For this purpose, a mathematical model describing the system’s variables, objective function, and constraints are developed. Thereafter, the performance of the developed model is simulated and analyzed using the dynamic load demand of a microbrewery brewery as a case study in the South African context. For the selected brewery, the simulation results have shown that for the solar resources as well as applicable grid tariff; up to 53.5% daily operation cost reduction can be achieved when using the proposed system as comped to the usage of the grid alone.
Linear Regression Algorithm Results for a PV Dual-Axis Tracking-Type System
Authors:   Department of Electrical and Mining Engineering, University of South Africa, Florida, Roodepoort, South Africa, Lehloka Motlatsi C. , Swart James A. , Hertzog Pierre E.
Published: May 2021

A photovoltaic (PV) module converts solar energy into electrical energy. In order to increase the output power of any PV module, several factors including tilt angle, orientation angle, load profile, environmental condition, latitude of the location site, and energy management techniques should be considered. It is essential to continuously deliver the highest possible power to a load for a given day, which may be achieved by using a tracking-type system as compared to a fixed-type system. The purpose of this paper is to present the results of an algorithm that may be applied to a dual-axis system located in an elevated plateau of the interior of South Africa in order to sustain a high output power. Two identical 310W PV modules were used for a fixed-type and tracking-type system. The fixed-type system was installed at a tilt angle of Latitude minus 10° serving as a baseline to the tracking-type system. A LabView user interface was developed to record and display the voltage and current measurements from the PV modules. Results indicate that the dual-axis tracking-type system extracted more power (on average 39.32% more power) as compared to the fixed-type system. A key recommendation is to use a linear regression algorithm with a tracking-type system to enable a higher output energy yield for a given day.
Design of a Smart Air Conditioning Controller Based on the Occupancy of a Building
Authors:   Department of Electrical and Electronic Engineering, University of Jeddah, Jeddah, Saudi Arabia, Hashmi Anas M. , Alkabiri Ibrahim A. , Alnajjar Khaled W. , Alattas Hatim H. , Almutaiti Talal H.
Published: May 2021

This paper presents design of an efficient air conditioning control system that decides the number of air conditioning units to be operated based on the occupancy of a building. The objective of the research was to develop an automatic system using inexpensive electronic components and basic control methods in order to reduce electric power wastage in schools, colleges, offices, and homes. In this research, several experiments have been conducted to determine the optimum parameters for designing a cooling control set-up. The hardware implementation of the smart control system is presented and its performance is assessed. The proposed smart system was installed in building NJ10 at University of Jeddah, Jeddah, Saudi Arabia as a pilot project. As per the observations, energy consumption and cost can be reduced by a considerable amount, making the system efficient, when the proposed set-up is installed.
FTC-OF: Forwarding Traffic Consciousness Objective Function for RPL Routing Protocol
Authors:   EEA&TI laboratory of Faculty of Science and Techniques, Hassan II University, Casablanca, Morocco, Hassani Abdelhadi Eloudrhiri , Sahel Aicha , Badri Abdelmajid
Published: May 2021

The diversity of Internet of Things applications require a flexible routing protocol to cope with several constraints. In this context, the RPL protocol was designed to meet the needs of IoT. RPL relies on an objective function based on specific metrics to fulfill its routing strategy. The single routing metric problem leads generally to non-optimized routes selection. As a consequence, two major issues emerge, mainly the node’s congestion due to the high number of forwarded packets, also the greedy energy consumption by those nodes that conduct to fast batteries draining. In that purpose, Forwarding Traffic Consciousness Objective Function has been proposed, which combines three routing metrics, namely hop count, RSSI and a newly designed Forwarded Traffic Metric (FTM). The proposed method, evaluated using COOJA against ETX and Energy based RPL, showed a packet delivery ratio increase respectively with 2% and 11% in low and high traffics, considerably reduces the power consumption with approximately 47% as well as it achieves a good balance of traffic managed by the relay nodes.
Design and Simulation-Based Parametric Studies of a Compact Ultra-Wide Band Antenna for Wireless Capsule Endoscopy System at Inside Body Environment
Authors:   Dept. of Electrical and Electronic Engineering, City University-Bangladesh, Dhaka, Bangladesh, Rakib Md. Abdullah Al , Ahmad Shamim , Faruqi Tareq Mohammad , Haque Mainul , Rukaia Sharifa Akter , Nazmi Sumaiya
Published: May 2021

This paper focuses to design a compact (110mm³) Ultra-Wide Band (UWB) (3.1GHz to 10.6GHz) antenna, which covers almost the whole 10dB impedance matching bandwidth of the UWB range. Two of the main specialties of this article over other related articles are its antenna’s wider bandwidth (approx. 7.3GHz) and antenna’s simulation environment. No other papers consider such a realistic model to simulate their antenna, before. Due to its wider bandwidth, this antenna can be employed in the Wireless Capsule Endoscopy (WCE) system, which mainly requires a high-speed real-time data transfer-capable antenna. The antenna was examined inside simplified human Gastrointestinal (GI) tract phantoms (Colon, Esophagus, Small Intestine and Stomach) as well as the human Voxel GI tract model by maintaining proper tissue properties for the sake of accurate parametric results. Biocompatible material polyimide was used to construct the capsule wall to fulfill the system’s biocompatibility. In the result analysis part, the proposed antenna’s SAR (Specific Absorption Rate) or electromagnetic energy amount, consumed by near-side body tissue was considered and found in the acceptable region, according to Federal Communication Commission (FCC)’s regulation. Also, other crucial antenna parameters such as VSWR, reflection coefficient, radiation characteristics, efficiencies, directivity and surface current density were adoptable compare to other related articles. The Finite Integration Technique (FIT) of CST Microwave Studio Suite 2020 was used to investigate the antenna parameters.
Comparative Analysis on Optimal Placement of TCSC under Single Line Contingency by Using PSO and GA
Authors:   Mandalay Technological University /Electrical Power Engineering Department, Mnadalay, Myanmar, Oo Su Myat Noe , Myint Swe Swe , Usuda Shouji
Published: May 2021

In the network contingencies, the branch overloading and voltage violation are the most serious conditions and may lead to security problems. The application of Thyristor Controlled Series Capacitor (TCSC) can provide the required apparent reactance smoothly and rapidly and can reduce network contingency problems. This paper focuses an application of Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) to find out the optimal locations of TCSC devices under single contingency to reduce the voltage drops at system buses and line flow improvement on transmission lines. The suitability of the proposed technique is examined on Myanmar Electric Power System. The optimized location provided by each method is applied to single line contingency condition and the responses are observed. According to the simulation results, PSO method can provide the better the stability performance under single line contingency.
The Establishment of Supported Decision-making Model for Evaluation Teaches Professional Development Effects Based on Fuzzy Theory
Authors:   Graduate Institute of Cultural and Creative Design, Tung Fang Design of University, Kaohsiung City, Taiwan, Liang Wen-Tang
Published: May 2021

A country’s competitiveness depends on the performance of its national education. Meanwhile, the effects of national education rely on the professional aptitude of teachers. Facing the current knowledge economy, all countries are trying to use quality education to develop highly competitive citizens through educational reform. Therefore, inspiring self-awareness of teachers through internal and external power and further enhancing the profession both spontaneously and continuously is the only way to achieve quality education. This study adopts the group decision technique of the (Delphi method) to identify the following four review factors: course design and teaching, class operation and guidance, professional research and educational development, and professional dedication and attitude, as well as relevant content through a questionnaire survey, analysis, and construction. Furthermore, the quantification function of the fuzzy logic theory is applied to establish a scientific and highly objective “supported decision-making model for evaluating the professional development effects of teachers”. In addition to providing evaluation for teaching self-assessment and the overall educational effects of the educational unit, our findings could be used as references for education and administrative departments to evaluate educational results.
Effective Communication in Indonesian High School: The Ombuds Office Criteria
Authors:   Universitas Pendidikan Indonesia, Bandung, Indonesia, Wulandari Wida , Mulyadi Hari
Published: May 2021

This study aims to determine the relationship and strength of the relationship between factors that influence effective communication. The research method in this study is an explanatory survey with data collection techniques using a questionnaire from The Ombuds Office of the University of Louisville using a Likert scale. Data were processed with SPSS 23 and analyzed using SEM multiple regression CFA factor analysis approach. The results showed that 65% and 78.1% understanding and expression factors had a very strong influence on the effective communication skills of high school students
Scaffolding Students’ Learning through Teacher’s Questioning
Authors:   Ministry of Education, Brunei Darussalam, Marmin Nazli Noor , Matzin Rohani , Jawawi Rosmawijah , Husain Shamsinar , Petra Nur-Ashikin , Amjah Yusimah
Published: May 2021

Questioning plays a significant role in teaching as teachers’ questions can help develop students’ learning and enhance students’ engagement in the classroom. The purpose of this study was to investigate on the types of questions asked by Commercial Studies teachers and on how they used questions to scaffold their students’ learning. The study focused on three secondary schools in Brunei Darussalam. The data collection processes involved classroom observations during Commercial Studies lessons and interviews with three teachers. The findings showed that the questions asked by Commercial Studies teachers varied according to the purpose of the lessons and teachers’ perceptions on the requirements of syllabus and examinations. Teachers were observed to have used questions to scaffold students’ learning by utilising lower-level questioning which focused on remembering, understanding and applying in order to engage the students with the new content. As the students progressed, the teachers began to employ higher order questioning which focused on analysing, evaluating and creating. As part of the process of scaffolding, the teachers drew on students’ personal experiences, linked what students had known to the new content, broke the questions into parts and offered clues or hints to the students. This study also recommended for teachers to be given professional development training to further improve their questioning techniques.
Kepadatan Populasi Wereng Coklat (Nilaparvata lugens, Stal.) dan Musuh Alaminya Pada Berbagai Varietas Padi di Bantul Yogyakarta
Authors: Sudarsono Darmawan Suryo
Published: May 2021

A research to observe the population density of brown planthoppers (Nilaparvata lugens, Stal.) and their predator and parasitoid natural enemies has done on the rice field in Bantul regency of Yogyakarta. The research was conducted to observe the hoppers and its natural enemies on three local varieties and one superior brown planthoppers resistant variety of rice. The three local varieties of rice were Rejosari, Sri Kuning, and Sri Ayu, while the hopper resistant variety was IR 64. The observation were replicated three times. The result showed that population of brown planthoppers in the three local varieties of rice were higher than in the resistant IR 64 hybrid variety. The population of predators and parasitoid were relatively high in order to control the development of brown planthopper population. The predator Lycosa sp. and the parasitoids Anagrus sp.  were commonly found in the ecosystem.
Kajian Aktivitas Infeksi Rhizobium sp. Indigenus Pada Kerandang (Pueraria phaseoloides)
Authors: Triwahyuningsih Nike , Pristiwantoro Eko Cahyo , Utari Lilik
Published: May 2021

Kudzu, a kind  of  legume   cover  crops  (LCC),   plays  important   roles  in  soil and  water conservation. It is effective  for  inhibiting  erotion,  compaction  and leaching  of nutrients,  as well as to suppress weeds.  Plants growing with legume  ground covers usually show  better nutrition,   growth and yield. Recently,  this cover crops have been widely  used to prevent  the negative effects  and to improve  soil physical  and nutritional  characteristics. As a legume,  bacterial  inoculation   is to enhance  the infection and nodulation activity. A research  to observe  the role of indigenous  Rhizobium   on infection and nodulation  activity of kudzu was carried  out in September  till December 2004.  The research  was done in Regosol  volcanic  soil in Tlatar  Village  of Sawangan in Magelang district of Central  Java. A pot experiment   was arranged in 4x2 factorial    completely   randomized   design  which  was repeated   three times.   The  seedling   innoculation   with  root  nodules  endophytic   bacteria   was  to increase  nodulation  and to enhance  Kudzu  plant growth.   The seedlings  were inoculated  with  1, 2 and 3 ml/pot of grinded  root nodules  of wild plants  containing  endophytic  Rhizobium  sp.  The wild kudzu  plants were taken  from  coastal  sandy  land  of southern   Yogyakarta.   All treated seedlings were planted  in a sterilized  medium  to be compared  to the unsterilized  one in order to examine  the role of indigenous  bacterias. Observation  on bacterial infection activity, nodulation,  and plant growth were taken  at week  4, 6, 8, and  10. All the  datas  were  variance   analyzed   and the  treatments average  were  tested  with 5% level  of Duncan's multiple range test. The  results  showed  that  application   of 2 ml/pot  of innoculum significantly   increased  the infection  activity, nodulation  and plant growth. Sterilized  soil decreased  the infection  activity.   Since the innoculation  of endophytic Rhizobium  sp.  in unsterilized  soil significantly   increased the infection actifity,  nodulation  and plant growth,  so the indigenous  Rhizobium sp. in rhizhosfer  was needed to sinergisticaly  worked  well with inoculum  to increase  infection  activities   and root nodulation.
Ulasan (Review) Pemasyarakatan Penggunaan Pestisida Nabati Dalam Mendukung Agribisnis
Authors: Wiranti E. W.
Published: May 2021

Pestisida  sintetis  hingga  saat ini masih  menjadi  andalan  dalam  meminimalkan kehilangan hasil  akibat  serangan organisme pengganggu tanarnan (OPT).   Meskipun dampak negatif dari penggunaan pestisida sintetis banyak ditimbulkan, namun petani  masih  sangat membutuhkannya. Oleh karena itu media media diperlukan alternatif lain, yaitu penggunaan pestisida  yang ramah lingkungan agar aman bagi manusia  dan lingkungan, salah satunya adalah  dengan  menggunakan pestisida  nabati  yang bahan dasarnya  berasal  dari tumbuhan. Di Indonesia penggunaan   pestisida nabati  mempunyai  prospek yang baik, selain menghemat devisa  juga  mendukung   agribisnis  dan kelestarian lingkungan. Oleh karena itu pemasyarakatan  penggunaan pestisida nabati perlu dilakukan.
Hablemos de política educativa en América Latina y el Caribe #8: Colegios privados en tiempos de COVID-19
Authors: Álvarez Marinelli Horacio , Elacqua Gregory , Méndez Carolina , Munevar Isabela , Vásquez Diana
Published: May 2021

La pandemia ocasionada por el COVID-19 ha afectado considerablemente a las escuelas privadas de América Latina y el Caribe, poniendo en riesgo la continuidad del servicio educativos de millones de estudiantes, ya que muchas escuelas han cerrado o podrían cerrar. Si esto pasa el sistema educativo debe garantizar la absorción de los estudiantes que podrían quedarse sin escuela. En este contexto, proponemos y discutimos alternativas a los gobiernos que van desde fortalecer el sistema público educativo hasta subsidiar la oferta o demanda de colegios privados. La estrategia más adecuada para cada país dependerá de su contexto, y de la ponderación de sus costos y beneficios, pero, sí enfatizamos que es importante que los países actúen de una manera u otra, con el fin de garantizar que los millones de estudiantes de escuelas privadas puedan continuar sus estudios en instituciones de calidad.
El paquete ideológico en el Estado contemporáneo. Un objeto no tan sublime
Authors: Márquez Vega Andrés
Published: May 2021

Las críticas negativas a instituciones que son garantes para los derechos de los individuos como la policía, se han tornado comunes en el status-quo global por el uso desmedido de su fuerza ante civiles. La reiteración y no corrección progresiva de estas conductas en casos explícitos, como la muerte de George Floyd por la policía estadounidense, nos lleva a cuestionar si estas conductas se justifican en una razón más profunda. En este artículo se analizará como la historia y mecánica para la conformación del estado contemporáneo moldeó la utilidad de la institución de la policía.
AksharaNet: A GPU Accelerated Modified Depth-Wise Separable Convolution for Kannada Text Classification
Authors: Siddiqua Shahzia , Chikkaguddaiah Naveena , Manvi Sunilkumar S. , Aradhya Manjunath
Published: May 2021

For content-based indexing and retrieval applications, text characters embedded in images are a rich source of information. Owing to their different shapes, grayscale values, and dynamic backgrounds, these text characters in scene images are difficult to detect and classify. The complexity increases when the text involved is a vernacular language like Kannada. Despite advances in deep learning neural networks (DLNN), there is a dearth of fast and effective models to classify scene text images and the availability of a large-scale Kannada scene character dataset to train them. In this paper, two key contributions are proposed, AksharaNet, a graphical processing unit (GPU) accelerated modified convolution neural network architecture consisting of linearly inverted depth-wise separable convolutions and a Kannada Scene Individual Character (KSIC) dataset which is grounds-up curated consisting of 46,800 images. From results it is observed AksharaNet outperforms four other well-established models by 1.5% on CPU and 1.9% on GPU. The result can be directly attributed to the quality of the developed KSIC dataset. Early stopping decisions at 25% and 50% epoch with good and bad accuracies for complex and light models are discussed. Also, useful findings concerning learning rate drop factor and its ideal application period for application are enumerated.
The upregulation of miR-204-3p in LPS-induced acute lung injury aggravated pulmonary endothelial cells apoptosis via targeting sulfatase 2
Authors: Zhang Liya , Zhu Zhengyu , Zhang Qian , Mao Zhengdao
Published: May 2021

Acute lung injury (ALI) results from the injury of alveolar epithelial cells and pulmonary capillary endothelial cells, with a high mortality rate ranging from 29% to 42%. Therefore, more efficient therapeutic strategies for ALI are necessary. Numerous studies revealed that miRNAs play a role in the regulation of ALI. Lipopolysaccharide (LPS) can induce an inflammatory response and has been widely applied in the establishment of the mouse ALI model. Here, we reported that miR-204-3p expression was upregulated by LPS treatment with increased cytokine secretion. LPS treatment promoted cell apoptosis, accompanied by abnormal cell structure and unobvious alveolar structure. These effects could be prevented by down-regulation of miR-204-3p, and promoted by miR-204-3p overexpression. Sulfatase 2 (SULF2) appeared to be the target of miR-204-3p predicted by TargetScan. Downregulation of miR-204-3p enhanced the protein level of SULF2, indicating that SULF2 was a target of miR-204-3p, which could negatively regulate the expression of SULF2. Thus, targeting miR-204-3p may be a potential therapeutic strategy for ALI.
Study of carbon dioxide hydrogenation to hydrocarbons over iron-based Catalysts: Synergistic effect
Authors: Shahroudbari Isa , Sarrafi Yaghoub , Zamani Yahya
Published: May 2021

The full article will be published in the English version of the  journal "Catalysis in Industry" No. 4, 2021.

Hydrogenation of CO2 to CO and hydrocarbons is carried out over a wide range of catalysts. Group of VIIIB transition metals have proved high conversion and selectively for CO and methane. Meanwhile, low cost and effective catalysts are preferable in an industrial scale. In this work, the synergistic effect of iron content on the catalytic performance were investigated in carbon dioxide hydrogenation reaction. Incipient wetness impregnation procedure was used for the preparation of four γ-Al2O3 supported iron-based catalysts. BET, XRD, H2-TPR and TEM techniques were employed for the catalyst characterization. The evaluation of catalysts were carried out in a fixed bed reactor at the process conditions of temperature of 300 °C, pressure of 20 atm, H2 to CO2 ratio of 3 and GHSV of 3 nl.h–1·gCat–1. It was found that the promoter addition improves the activity of Fe catalyst for both Fischer – Tropsch synthesis (FTS) and Reverse Water Gas Shift (RWGS) reactions. The results showed that conversion of CO2 was from 15.6 to 35.6 % with major products of methane, C2 to C4, C5+ and CO. It was also found that impact of K and Ce promoters into iron catalyst showed the highest conversion and hydrocarbon yield due to the synergistic effect.
Occupational Eye Diseases and Injuries - A Cause for Concern
Authors: Kulshrestha Dr Vertika , Mishra Dr Ak
Published: May 2021

Our eyes are the most essential component of our sensory system. Their continuous exposure to the environment makes them susceptible to diseases and injuries. Leading ophthalmologists are well aware about the risks associated with negligence in case of occupational eye injuries or diseases. The defects may range from low risk to high risk where loss of sight might become inevitable. Thus addressing this topic carries relevance both for the medical community as well as the public at large. We will be looking at the various aspects of the diseases and injuries whereby recommending strategies for prevention, timely diagnosis & treatment.
ETNOCONHECIMENTOS SOBRE ANIMAIS DE PESCADORES ARTESANAIS NA AMAZÔNIA COSTEIRA PARAENSE
Authors: Santos Claudia Nunes
Published: May 2021

A diversidade faunística, bem como a diversidade humana da Amazônia tem sido estudada por diversos especialistas em busca da compreensão das formas de vida e evolução do sistema. Para superarmos os limites das interpretações produzidas, além de unirmos diferentes ferramentas, técnicas e abordagens das diversas disciplinas da ciência, precisamos considerar as subjetividades pertencentes a este complexo. Os conhecimentos locais, tradicionais ou etnoconhecimentos dos diferentes povos e comunidades ampliam a visão sobre a sociobiodiversidade da região. Um dos esforços que orientam a Etnobiologia é a ruptura como um modo de fazer ciência, que separa sociedade e natureza, bem como a compreensão de que o conhecimento é construído na relação entre pessoas pesquisadas e que pesquisam. Apresento aqui algumas inferências conservacionistas das interações entre pescadores com tartarugas marinhas e aves costeiras. As pesquisas foram realizadas entre 2015 e 2018, em seis comunidades de pescadores nos municípios Bragança, Tracuateua e Salinópolis, no estado do Pará. As ricas etnozoologias e etnotaxonomias de pescadores artesanais sobre tartarugas-marinhas e aves-costeiras locais revelam um conhecimento aprofundado sobre estes animais que não são de interesse para o autossustento. E ainda, a consciência dos pescadores quanto à importância dos animais para os ecossistemas são etnoconhecimentos importantes para o entendimento das relações humanos-animais, bem como para ações de preservação e manejo localmente referenciadas.
OS ESPAÇOS DE REPRESENTAÇÃO SEGUNDO A GEOGRAFIA CRÍTICA
Authors: Pereira Dayse Leite , Neto José Queiroz de Miranda
Published: May 2021

A Geografia é uma ciência plural e, devido a sua pluralidade, sofreu muitos conflitos no campo epistemológico e conceitual. Este fato reflete a sua evolução histórica, uma vez que essas discussões teóricas e mudanças conceituais se dão conforme a transformação da sociedade e revelam uma ciência atual e dinâmica que contribui de modo persistente à construção de um saber espacial. Partindo desse pressuposto, o presente artigo tem por objetivo discutir o espaço geográfico a partir dos espaços de representação, enfatizando os principais marcos da Geografia e a mudança do pensamento sobre o homem e o espaço sob uma perspectiva Lefbreviana, tendo como corrente de análise a Geografia Crítica. A partir de um estudo bibliográfico que se vale de diferentes autores da ciência geográfica e de outros campos do conhecimento, busca-se entender como a concepção que se tem do espaço contribui para uma nova forma de traçar caminhos e entender a realidade de maneira mais profunda, assim como a valorização da dimensão temporal permite compreender que o espaço, em todo e qualquer período histórico, resulta de um processo de produção que abarca diferentes facetas da existência humana.
Public knowledge, beliefs, psychological responses, and behavioural changes during the outbreak of COVID-19 in the Middle East
Authors: Abazid Husam , Basheti Iman A. , Al-Jomaa Esraa  E. , Abazid Ayham , Kloub Warda M.
Published: May 2021

Objective: To evaluate the knowledge, believes, psychological and behavioural impact of COVID-19 on the general population in the Middle East, exploring how it impacted public lives.

Methods: A descriptive cross-sectional online survey was sent to a convenience sample in the Middle East through social media (Facebook and WhatsApp) between 16th of June and 30th of June 2020. The questionnaire was designed to collect the demographic, participant’s source of information regarding COVID-19, knowledge and believes about COVID-19, the psychological consequences of COVID-19, impact of COVID-19 on participant’s behaviour. The final version of the questionnaire was further tested for content validity by experts in the field.

Results: A total of 2,061 participants completed the survey, with the majority being females (n=1394, 67.6%), from urban areas (n=1896, 92%) and the majority were from countries of The Levant (n=1199, 58.1%), followed by the Arabian Peninsula (n=392, 19.1%), Iraq (n=300, 14.6%) and Egypt (n=138, 6.7%). Few participants (3.0%) reported to have been infected and many (n=1847, 89.6%) were committed to quarantine at home. Social media platforms were the most common sources of information (41.2%). Many (63%) believed that COVID-19 is a biological weapon and were afraid of visiting crowded places (85%). The majority avoided public facilities (86.9%) such as prayer places and believed that the news about COVID-19 made them anxious (49.5%).
FORMAÇÃO DE PROFESSORES E TECNOLOGIAS NOS PROCESSOS EDUCATIVOS
Authors: Machado Bruna , Giacomazzo Graziela Fátima
Published: May 2021

RESUMO: As Tecnologias de Informação e Comunicação (TICs) estão conquistando grandes espaços na contemporaneidade, estando em qualquer meio social. Uma vez que as TICs estão em toda parte, cabe discutir este assunto no campo educacional, visando à concepção que o docente possui acerca deste assunto. Procurou-se compreender como essas tecnologias fizeram parte da formação em graduação das educadoras, se as professoras trabalham em sua prática docente com os meios tecnológicos e se o espaço de trabalho das educadoras propicia essa relação com as tecnologias, oferecendo algum tipo de formação aos docentes. Os autores que foram direcionados e contribuíram para a construção deste documento foram Almeida (2000), Brasil (1930), Brasil (1996), Brasil (2013), CIEB (2016), entre outros. Sendo assim, foi possível realizar uma pesquisa de natureza básica qualitativa com pedagogas atuantes no ensino fundamental em escolas da rede pública e privada da região de Criciúma. O qual pode ser visível que as pesquisadas possuem algum conhecimento sobre as tecnologias de informação e comunicação e da importância que as TICs possuem para o processo ensino-aprendizagem. PALAVRAS-CHAVE: Formação de professores. Educação. Tecnologia. Ensino fundamental.
PAPEL DA GESTÃO ESCOLAR NA REESTRUTURAÇÃO CURRICULAR A PARTIR DA BASE NACIONAL COMUM CURRICULAR NA VISÃO DE SUAS GESTORAS
Authors: Silveira Felipe Fabri , Mello Maria Aparecida da Silva
Published: May 2021

RESUMO: A Base Nacional Comum Curricular constitui-se num lócus de reflexões e discussões acerca de um documento legal e normativo que determina um conjunto de conhecimentos e aprendizagens a serem desenvolvidos pelos estudantes ao longo de sua trajetória na educação básica. Assim, lança-se o olhar para o desenvolvimento curricular e sua necessária reestruturação, mediado pelo gestor escolar no processo de gestão democrática. Esse trabalho foi realizado no âmbito de três escolas da rede pública estadual da cidade de Araranguá/SC e tem como objetivo analisar o papel da gestão escolar na reestruturação curricular a partir da BNCC na visão de suas gestoras. Utilizou-se de abordagem qualitativa e descritiva, por meio de entrevistas e análise dos PPPs, com objetivo de responder ao seguinte problema de pesquisa: qual o papel da gestão escolar das escolas pesquisadas na reestruturação curricular a partir da BNCC na visão de suas gestoras? As entrevistas foram assim categorizadas: o papel do gestor escolar na implementação da BNCC; a reestruturação do currículo; a participação da comunidade educativa; o envolvimento dos professores no domínio das competências; o trabalho com as dez competências gerais; o papel do PPP na efetivação da implantação da BNCC. Por meio das respostas obtidas e da efetivação das análises, concluiuse que a gestão escolar na perspectiva da gestão democrática é fundamental nos processos de implantação da BNCC, pois seu papel é de mediação nas ações dos docentes nos processos de reestruturação curricular para o cumprimento de seus pressupostos legais e fundamentos pedagógicos. PALAVRAS CHAVE: Desenvolvimento Curricular. Base Nacional Comum Curricular. Gestão Democrática.