bluuebunny/crossref_metadata_2025 huggingface dataset:
Conceptualizing the Core of “Social Emotional Learning”
Authors: Gehlbach Hunter , Chuter Claire
Published: September 2020

The global pandemic and sudden lack of face-to-face contact between teachers and students has accelerated interest in social-emotional learning (SEL). With greater numbers of people thinking about SEL, more confusion has emerged: How should we conceptualize SEL? Which constructs should be included? We propose a conceptualization of SEL that is anchored in the fundamental psychological needs of students. First, we describe these psychological needs—social connectedness, motivation, and self-regulation—that are prerequisites for optimizing student outcomes. Then, we outline several benefits that we hope this conceptualization offers to researchers and practitioners: clarity with respect to what SEL is and is not, an evaluative tool to help schools select SEL models and curricula, and practical guidance for educators helping students.
Estimating variance-mean mixtures of Normals
Authors: HAMDAN HASAN , XU LING
Published: September 2020

A new semi-nonparametric method for modeling data with Normal variance-mean mixtures (NVMM) is presented. This new method is based on the least-squares programming routine, UNMIX. Density estimates based on random samples of size n from two, three, and four components of NVMM are found using UNMIX. Graphical comparisons of the UNMIX fit found by the EM Algorithm and the Bayesian approaches are done using three real life examples. A quantitative comparison using the AIC and Chi-Square is done for one of the most commonly used examples, the Galaxy Data. The results are promising and the method has great potential for improvement.
Bootstrap bias correction for average treatment effects with inverse propensity weights
Authors: KUNDHI GUBHINDER , VOIA MARCEL
Published: September 2020

The estimated average treatment effect in observational studies is biased if the assumptions of ignorability and overlap are not satisfied. To deal with this potential problem when propensity score weights are used in the estimation of the treatment effects, in this paper we propose a bootstrap bias correction estimator for the average treatment effect (ATE) obtained with the inverse propensity score (BBC-IPS) estimator. We show in simulations that the BBC-IPC performs well when we have misspecifications of the propensity score (PS) due to: omitted variables (ignorability property may not be satisfied), overlap (imbalances in distribution between treatment and control groups) and confounding effects between observables and unobservables (endogeneity). Further refinements in bias reductions of the ATE estimates in smaller samples are attained by iterating the BBC-IPS estimator.
The effects of using mobile technologies and ICT to students’ attitudes and achievement.
Authors: Kassymbek Zhaudir Kanatkyzy
Published: September 2020

This study examines how enhanced media-devices is used in classrooms in Kazakh schools from the perspective of students, teachers, and decision makers. Based on four fundamental research questions, the goal is to analyze the level and impact of mobile technologies on pedagogy and students' perceptions of mobile technologies use in the classroom. Although some schools are afraid to introduce too much enhanced media-devices into their practice, this study aims to prove that introducing mobile technologies into the teaching and learning process is extremely valuable. Despite some innovations in pedagogical strategy, including notable advances in the use of mobile technologies, most secondary schools still have a long way to go as schools around the world still have an old, teacher-oriented paradigm, as opposed to more modern, student-centered approaches. These results indicate that the use of mobile technologies elicit positive responses from students both in terms of how they perceive the mobile activities and how it improved their performance.
Factors affecting the college speciality selection of Kazakhstani students
Authors: Assanbayeva Gulzhaukhar
Published: September 2020

In this talk we discuss factors that influence and impact Kazakhstani students when it comes to decide major selection.To analyse and study factors,we surveyed 314 students over 16 universities of Kazakhstan (including private, semi-government and government universities). In the previous joint work with  (Assanbayeva & Kadyrov, 2020)  factor analysis resulted 9 scales,namely,teacher impact,occupation salary impact,external impact,personal interest impact,personal skills impact,national test impact,university cost impact,parents impact,state grant impact.The main aim of the present work is to investigate main factors that influenced the Kazakhstani students most.The next goal is to find any differences in terms of gender when it comes to major selection factors.As most participants were among Suleyman Demirel University,we also wanted to see if there any differences between factors that influence Suleyman Demirel University students major selection to students of other local universities.The statistical data analysis show that students found themselves to be the most influential by 6 factors out of 9 ,namely,influence of state grant, influence of university cost, occupation salary impact, national test impact, influence of personal interest and influence of personal skills.Findings also suggested that, there is no difference between these 6 factors depending on gender.Also,no differences were found among university and factors.
“INVESTIGATE MATHEMATICAL CREATIVITY IN THE FRACTIONS TOPIC IN FIFTH GRADE STUDENTS”
Authors: Assan Meruyert Maratkyzy
Published: September 2020

The article discusses the methodological problem of familiarizing a younger student with the concepts of "share" and "fraction" in an elementary school mathematics course. In mathematics textbooks for elementary grades, a student receives information about fractions only through a system of practical actions on real objects, quantities and a description of these actions in the language of special mathematical symbols. Teaching fractions is an integral part of the math program. But why are fractions so hard to understand for children? There are three big things that confuse children most often.1. We often ask children to complete a series of steps without understanding the reasons for these steps. Sometimes, when they are younger, students are not even ready for the development of concepts.2. Children often have misconceptions about all the complex topics of mathematics, including fractions. When we can help children resist these misconceptions, learning is often easier.3. Children struggle with fractions for the same reason that children struggle with many new concepts: they just need practice. Examples of such practical actions are given in the article.
The Effects of using Geogebra on 10th-11th grade students
Authors: Borambaev Murat
Published: September 2020

Abstract.The article presents new trends in teaching methods through the Geogebra program, which can be especially important for the future development of e-learning for 10th-11th grade students. Also, the article gives an idea of the various methodological frameworks with several features, examples for teaching mathematics at the level of 10th-11th grade students on an interactive and creative path. This article discusses the conclusions of the didactic experiment, where it was found that GeoGebra was used in the teaching of algebra, geometry,  graphing,  3D, and more! Especially integrals, polyhedrons, volume, and surface area of geometric shapes had a positive impact on understanding and knowledge of students. Also, a survey instrument was used to elicit students' perceptions on the use of GeoGebra. Analysis of the questionnaire responses indicated a positive overall perception of using GeoGebra in learning about circles.Keywords: GeoGebra, teaching mathematics, the mathematics of 10th-11th grade students, creative environment, didactic experiment, circles, interactive teaching method.
Качество процесса оценки деятельности школ и его влияние на показатели работы школ
Authors: Tumlovskaja Jelizaveta
Published: September 2020

В последнее время система образования Литвы претерпевает важные изменения, переходя к системе, основанной на демократических ценностях. Поскольку Литва интегрируется в европейское пространство, качество образования становится очень важным в функционировании системы образования.  Литовские документы по образованию утверждают, что качество образования является договорным понятием (Концепция системы обеспечения качества в формальном образовании, 2008). Ориентиром для разработки понятия качества является Концепция хорошей школы (2015). Вышеупомянутая концепция основана на положениях парадигмы свободного образования и гуманистических ценностях, которые были провозглашены в Концепции национальной школы (1989), созданной накануне независимости. Однако на практике литовские общеобразовательные школы сталкиваются с трудностями при выполнении положений, зафиксированных в    документах – как показатели качества деятельности литовских общеобразовательных школ, так и показатели успеваемости учащихся, а также показатели доверия населения к образованию в Литве являются средними. В целях содействия непрерывному управлению качеством в общеобразовательных школах Литвы с 2007 года внедряются процессы оценки качества: самооценка и внешняя оценка. Эти процессы основаны на коллегиальном взаимодействии, диалоге и имеют целью способствовать позитивным изменениям в качестве образования.Ключевые слова: качество образования, оценка качества деятельности, влияние оценки.
Logic inference based construction of a supervisor for a discrete event system
Authors: Davydov A. , Larionov A. , Nagul N.
Published: September 2020

The paper provides a general view on the original logical inference based approach
to dealing with discrete event systems as subject to supervisory control theory. The approach
proposes a representation of automata-based discrete event system as a positively constructed
formula and implementation of the calculus of positively constructed formulas. The stages of
a supervisor construction are illustrated with a simplified model of an autonomous underwater
vehicle operational modes switching. The supremal controllable sublanguage of the specification
and the supervisor are constructed.
Large-scale analysis of energy system vulnerability using in-memory data grid
Authors: Edelev A.V. , Sidorov I.A. , Gorsky S.A. , Feoktistov A.G.
Published: September 2020

Nowadays, determining critical components of energy systems is a relevant problem. The complexity of its solving increases significantly when it is necessary to take into account the simultaneous failures of such components. Usually, in problem-solving, processing a large number of failure variants and their consequences is required. Processing such data using traditional relational database management systems does not allow us to quickly identify the most critical components. In the paper, our successful practical experience in applying an in-memory data grid within large-scale analyzing of the energy system vulnerability is provided. The experimental analysis showed the good scalability of distributed computing and significant reduction in data processing time compared to using an open-source SQL relational database management system. In developing and applying the distributed applied software package for solving the aforementioned problem we have used the Orlando Tools framework. Within its applying, we have implemented continuous integration of the package software taking into account the preparing and processing of subject-oriented data through the in-memory data grid.
Predicting runtime of computational jobs in distributed computing environment
Authors: Feoktistov A.G. , Basharina O.Yu.
Published: September 2020

The paper addresses a relevant problem of predicting the runtime of jobs for executing problem-solving schemes of large-scale applications in a heterogeneous distributed computing environment. Such an environment includes nodes that have various hardware architectures, different system software, and diverse computational possibilities. We believe that increasing the accuracy in predicting the runtime of jobs can significantly improve the efficiency of problem-solving and rational use of resources in the heterogeneous environment. To this end, we propose new models that make it possible to take into account various estimations of the module runtime for all modules included in the problem-solving scheme. These models were developed using the special computational model of distributed applied software packages (large-scale scientific applications). In addition, we compare the prediction results (jobs runtime and their errors) using different estimations. Among them are the estimations obtained through the modules testing, users estimations, and estimations based on computational history. These results were obtained in continuous integration, delivery, and deployment of applied and system software of a package for solving warehouse logistics problems. They show that the largest accuracy is achieved by the modules testing.
The conceptual design of a complex technical object based on intelligent technologies
Authors: Karimov R.R. , Kondratyeva N.V. , Kuzmina E.A. , Kovtunenko A.S. , Verkhoturov M.A. , Valeev S.S.
Published: September 2020

The problem of system design of complex technical objects based on intelligent technologies is considered. An optimization model for the conceptual design of a micro-mini-satellite based on a genetic algorithm is discussed. An artificial neural network model of a propulsion system is considered, as well as a heuristic algorithm for analyzing the cross-correlation of telemetric parameters of a micro-mini-satellite. The concept of constructing an intelligent system for information support of the life cycle of a complex technical object based on the considered models and algorithms is proposed.
Analysis of one type of communication systems using software and probabilistic methods
Authors: Reznik A.L. , Soloviev A.A. , Torgov A.V.
Published: September 2020

The study is devoted to one of the tasks related to information and computer systems with a different discipline of establishing connections between its nodes. Cases of systems with and without queues are considered. The efficiency of the systems (the relative load, the number of busy nodes, etc.) is calculated. To calculate the probability of the communication system being in one of the possible enlarged states, the corresponding Markov process is introduced and its asymptotic characteristics are determined.
Weighted networks in socio-technical systems: Concepts and challenges
Authors: Stojanov Z. , Stojanov J. , Jotanovic G. , Dobrilovic D.
Published: September 2020

Socio-technical systems join together humans and technique. Basic concepts and principles of socio-technical systems are outlined, as well as weighted networks as the appropriate mathematical models. Particular examples of socio-technical systems with various usages of weighted networks in domains such as airline connection networks, scientific collaboration, social networks, software engineering and urban traffic are presented. Comparative analysis
of the selected examples is outlined with the focus on the nature and functions of nodes, links and weights. The identified challenges, such as the creation of networks, evolving nature of systems, and the need for multidisciplinary teams in the system design are discussed.
Optimization of placement in the tasks of rapid prototyping and manufacturing of volumetric parts based on additive technologies
Authors: Verkhoturov M.A. , Verkhoturova G.N. , Yagudin R.R. , Danilov K.V. , Karimov R.R. , Kondratyeva N.V. , Valeev S.S.
Published: September 2020

The problem of optimizing the life cycle of complex three-dimensional objects in small-scale production is considered. Additive technologies and optimization algorithms for the placement of three-dimensional objects are considered as technologies to solve this problem. Using the multilevel synthesis method can significantly reduce the time for prototyping new products. It should be noted that since several independent parts can be manufactured at the same time, this problem belongs to the class of optimization geometric modelling problems, namely, the problem of three-dimensional irregular placement. An algorithmic solution is proposed for the most complex task - placing 3D objects in a container. The results of the analysis of the effectiveness of the proposed algorithms are discussed.
Abaetê Criolo:
Authors: Costa Thalita Terto , Oliveira David Barbosa de
Published: September 2020

Este artigo tem como objeto de estudo o projeto Abaetê Criolo, grupo escolar que trabalha com atividades artísticas e o estudo e pesquisa das temáticas antirracistas e de respeito à diversidade cultural.  O grupo está inserido na perspectiva da lei 10.639/03, que torna obrigatório o ensino da história e cultura afro-brasileira na escola. O objetivo da pesquisa foi investigar como as alunas participantes do projeto Abaetê Criolo manifestam suas identidades raciais e a contribuição do projeto nesse processo de formação e autoafirmação das suas identidades. Para alcançarmos esses objetivos, o método utilizado foi a Análise de Discurso Crítica (ADC) de entrevistas de alunas participantes do projeto Abaetê Criolo. Concluímos que, ao final de quatro anos de ações do grupo, conseguimos formar um corpo político que atuou diretamente na formação e fortalecimento de vários aspectos referentes às lutas negras, principalmente, no que se refere à construção da identidade racial da mulher negra.
A Assistência Social no Brasil; da Proteção ao Seguro
Authors: Brito Emídio Fontenele de , Benevides Marinina Gruska
Published: September 2020

A Assistência Social é uma Política Pública, capaz de servir à análise do processo de democratização da sociedade brasileira, quer se fale da distribuição de recursos construídos coletivamente, quer se diga do acesso a espaços de participação e efetivação de direitos sociais, políticos e civis. O artigo, construído a partir de pesquisa bibliográfica, levanta sérias dúvidas sobre os alcances desse processo, considerando as fortes tensões sociais e luta de classes que envolvem os beneficiários do Programa de Transferência de Renda Bolsa Família e as elites brasileiras, na disputa por acesso a capitais culturais, econômicos e sociais. O controle de recursos pelas elites tem garantido a seus integrantes um status diferenciado na determinação das regras sociais. Criado em 2003, o Programa tem sido reconhecido pela melhoria das condições de vida dos mais pobres, o que não significa dizer que ele tenha evitado o deslocamento da proteção social ao seguro e a tendência forte de transformar as políticas sociais em políticas contributivas e não universais ou de avanço da submissão do Estado aos interesses do capital.
Fórum Agenda do Servidor do Governo do Amapá:
Authors: Pinto Maria Cristina Vilhena Coelho , Frota Francisco Horácio da Silva
Published: September 2020

Este trabalho tem  como escopo apresentar o processo de construção da arena dialógica, criada pelo governo do Estado do Amapá, intitulada “Fórum Agenda do Servidor”, lançado no dia 22 de março de 2015. Essa iniciativa governamental visava permanente diálogo com diversas categorias de servidores públicos do Estado do Amapá, além de construção de políticas de capacitação dentro dos vários setores administrativos da Gestão Estadual. De forma objetiva, a intenção era assegurar o caráter democrático aos debates e decisões oriundas entre os entes sindicais que representavam os Servidores Públicos do Estado do Amapá e o Governo, num caráter de antecipação de demandas. Trata-se de uma pesquisa qualitativa acerca das reuniões/discussões evidenciadas pela Política desenhada pelo Governo do Estado do Amapá (2015 – 2018), direcionada aos servidores públicos estaduais através do Fórum
UJI EKSTRAK DAUN JAMBLANG (Syzgium cumini L.) TERHADAP PENURUNAN KADAR GLUKOSA DARAH TIKUS PUTIH JANTAN YANG DIINDUKSI STREPTOZOTOCIN
Authors: Raya Maxianus Kopong , Ngardita I Rai , Sumardi Ratih Nurani
Published: September 2020

Kemajuan perkembangan teknologi sangat mempengaruhi gaya hidup masyarakat, salah satu dampak negatifnya ialah munculnya berbagai penyakit degeneratif seperti Diabetes melitus (DM).

Pengobatan penyakit DM harus dijalani seumur hidup, dengan biaya pengobatan cukup tinggi. Penelitian Ayyanar (2012) pada pengobatan diabetes menyebutkan biji, daun, dan kulit pohon jamblang memiliki khasiat menurunkan kadar glukosa darah

Penelitian ini untuk mengetahui pengaruh ekstrak daun jamblang terhadap kadar glukosa darah tikus putih jantan Wistar yang diinduksi streptozotocin.

Tujuan dari penelitian ini untuk mengetahui pengaruh ekstrak daun jamblang terhadap kadar glukosa darah tikus putih jantan Wistar yang diinduksi streptozotocin.

Penelitian ini, merupakan penelitian eksperimen murni dengan pendekatan pre and post randomized controlled group design, menggunakan tikus putih jantan Wistar yang diinduksi STZ dosis 65 mg/kg BB dan NA 230 mg/kg BB, hewan coba dibagi menjadi 5 kelompok, yaitu : kelompok kontrol negatif, kontrol positif dan 3 kelompok perlakuan yang diberi ekstrak daun jamblang selama 21 hari dan dilakukan pengukuran kadar glukosa darah.

Penelitian dilaksanakan di Laboratorium Pusat Studi Pangan dan Gizi, Penelitian Antar Universitas-Universitas Gadjah Mada Yogyakarta, dilakukan dari bulan September â€“ Nopember 2015.

Rerata berat badan tikus awal awal dan akhir perlakuan : 179,00Â±12,93 gram dan 193,20Â±14,43. Rerata kadar glukosa darah awal dan akhir perlakuan : 250,61Â± 12,16 dan 139,48Â±6,17 (Ï=0,000). Uji Kruskall-Wallis menunjukkan perbedaan bermakna perubahan kadar glukosa darah dan uji lanjut Mann-Whitney.

Pemberian ekstrak daun jamblang dosis 720 mg/200 g BB menurunkan GDP lebih rendah dibandingkan dosis 180 dan 450 mg/kg BB.
UJI STABILITAS FISIK FORMULASI SEDIAAN GEL EKSTRAK DAUN KETEPENG CINA (Cassia alata L.) DENGAN GELLING AGENT CMC-NA TERHADAP Staphylococcus aureus ATCC 230840
Authors: Hastuty Henny Sesanti Budi , Purba Priska Noviana , Nurfadillah Eka
Published: September 2020

Latar Belakang :Ekstrak ketepeng cina (Cassia alata L.) mempunyai kandungan alkaloid, saponin, tanin, steroid, antrakuinon, flavonoid, dan karbohidrat, sehingga dapat dimanfaatkan sebagai antibakteri. Sediaan gel menjadi pilihan masyarakat karena sifatnya yag mudah mengering, penggunaannya praktis, memberikan rasa dingin dan kelebihan-kelebihan lainnya. Sifat gel tergantung dari penggunaan gelling agentnya yang memberikan pengaruh terhadap stabilitas gel, untuk itu diperlukan uji stabilitas gel.

Tujuan : Untuk mengetahui stabilitas fisik dan formulasi sediaan gel ekstrak daun ketepeng cina (Cassia alata L) dengan gelling agent CMC-Na terhadap bakteri Staphylococcus aureus ATCC 230840

Metode : penelitian eksperiment dengan uji laboratorium

Hasil : Hasil uji organoleptis menunjukkan formulasi gel Natrium karboksimetilselulosa (CMC-Na) memiliki warna hijau pekat, bentuk kental, bau aroma Oleum rosae, sediaan homogen, pH sediaan 6, daya sebar sebesar 3,35 cm dan daya lekat selama 9,55 detik. Hasil uji daya hambat terhadap bakteri Staphylococcus aureus ATCC 230840 seluas 7 mm.

Simpulan dari penelitian ini gel ekstrak daun ketepeng cina (Cassia alata L) memenuhi syara uji stabilitas fisik dan memiliki kemamuan menghambat bakteri Staphylococcus aureus ATCC 230840. Diperlukan penelitian lanjutan untuk menguji viskositas, konsistensi, iritasi kulit, dan aktivitas anti jamur maupun antibakteri lainnya.
HUBUNGAN PENGETAHUAN DAN POLA ASUH ORANG TUA DENGAN KEMAMPUAN TOILET TRAINING PADA ANAK USIA TODDLER DI PAUD ASYIYAH 2 PROVINSI SULAWESI TENGAH
Authors: Nurhayati Nurhayati
Published: September 2020

Toilet training sangat penting dalam membentuk karakter anak dan membentuk rasa saling percaya dalam hubungan anak dan orang tua. Keberhasilan toilet training dipengaruhi oleh pengetahuan dan pola asuh orang tua dalam mendorong anak mencapai tujuan yang diinginkan. Penelitian ini bertujuan untuk menganalisis hubungan pengetahuan dan pola asuh orang tua dengan kemampuan toilet training pada anak usia toddler di PAUD Asyiyah 2 Provinsi Sulawesi Tengah. Jenis penelitian ini adalah analitik dengan desain cross sectional. Populasi penelitian ini yaitu semua orang tua yang memiliki anak usia toddler di PAUD Aisyah 2 Provinsi Sulawesi Tengah sebanyak 32 orang. Sampel dalam penelitian ini adalah orang tua yang memiliki anak usia toddler di PAUD Aisyah 2 Provinsi Sulawesi Tengah sebanyak 32 orang dengan teknik pengambilan sampel total sampling. Data dianalisis menggunakan Fisherâ€™s Exact test. Hasil uji Fisherâ€™s Exact didapatkan nilai p=0,000 dan nilai p=0,001 (p Value < 0,05), ini berarti secara statistik ada hubungan pengetahuan dan pola asuh orang tua dengan kemampuan toilet training pada anak usia toddler. Berdasarkan hasil penelitian tersebut disarankan bagi orang tua (ibu) yang menerapkan pola asuh kurang baik agar dapat merubah atau menerapkan pola asuh yang tepat kepada anaknya agar mampu melaksanakan toilet training dengan baik.

Kata kunci : Pengetahuan, pola asuh, toilet training.
FAKTOR-FAKTOR YANG BERHUBUNGAN DENGAN RENDAHNYA MINAT MEMBACA BUKU KIA PADA IBU HAMIL GRAVIDA DI PUSKESMAS ABEPURA KOTA JAYAPURA TAHUN 2018
Authors: Amal Fachry
Published: September 2020

Penggunaan Buku KIA (Kesehatan Ibu dan Anak) merupakan salah satu strategi pemberdayaan masyarakat terutaÂ¬ma keluarga untuk memelihara kesehatannya dan mendapatkan pelayanan kesehatan ibu dan anak yang berkualitas. Berdasarkan survey awal yang telah dilakukan terhadap ibu-ibu hamil di Puskesmas Abepura, didapatkan hasil bahwa tidak semua ibu hamil membaca buku KIA, ironisnya karena diantara yang tidak membaca tersebut merupakan ibu hamil dengan kehamilan pertama, padahal mereka sendiri belum memiliki pengalaman dalam hal melahirkan, mengasuh dan merawat anak. Jenis penelitian ini adalah survey dengan rancangan Cross Sectional. Populasi berjumlah 77 orang, sedangkan sampel berjumlah 64 orang, teknik pengambilan sampel adalah accidental sampling. Instrumen pengumpulan data menggunakan kuesioner. Pengolahan data dilakukan dengan menggunakan program SPSS, uji statistik yang digunakan adalah Chi Square pada Î±=0,05. Hasil penelitian menunjukkan tidak terdapat hubungan antara pendidikan, pekerjaan, pengetahuan, aktivitas luar rumah dan media komunikasi dengan rendahnya minat ibu hamil gravida dalam membaca buku KIA di Puskesmas Abepura.
Modern methods of development of marine gas hydrate deposits
Authors: Bondarenko V. I. , Kovalevska I. A. , Prokopenko K. M.
Published: September 2020

In recent years, there has been a trend around the world towards a constant increase in the consumption of fuel and energy resources, in connection with this there is a significant increase in interest in non-traditional methods of extraction of various energy sources. For many countries, this issue is especially relevant, since the price of natural gas supplied from abroad is growing every year, which negatively affects the economy. Therefore, the need to modernize the structure of the oil and gas complexes and to improve the mechanism for the development of the energy segment, which is possible through the introduction and application of the latest gas hydrate technologies, which will provide an opportunity to obtain additional energy, is obvious.
The indoor climate modelling and the economic analysis regarding the energetic rehabilitation of church
Authors: Turcanu Florin-Emilian , Verdes Marina , Ciocan Vasilica , Popovici Catalin George , Hudisteanu Sebastian Valeriu
Published: September 2020

The paper describes the behaviour of a heating system with radiators in a cult building. There has commonly used in many churches with many shortcomings. The temperature distribution in the analysed space is simulated in 2D. The simulation is based on an example, the Cathedral of the Assumption of the Virgin Mary in Jassy. The heating system with radiators simulated with the FLUENT program, the results being edifying for the factual state of the building. An important aspect is the impact of these heating systems on the works of art, the church being the 18th — century edifice. Current environmental issues lead to the continuous development of technologies used to reduce primary energy consumption. Churches are an invaluable wealth, sheltering heritage elements preserved in museums and historic buildings. Unheated churches have been used for centuries. Then, after installing one or more different heating systems, signs of rapid degradation appeared.
Estimating inventory stocks for greenhouse heating needs
Authors: S Kurpaska  , A Krakowiak-Bal  , M Gliniak  , K Trzyniec  , K Nęcka
Published: September 2020

Paper deals with the problem of supply logistic for greenhouse energy purposes. It is an attempt to estimate the proper supplies of coal, to reduce the costs of warehouse management in the analyzed horticultural enterprise. The analysis includes estimation of the object's heat demands of the, an optimal order quantity and calculation of costs of maintaining inventory. The research object is a greenhouse complex (10 ha) with tomatoes cultivation. We calculated that, the proposed inventory shaping method, to determine the order quantity of energy raw material for the needs of the greenhouse, would reduce inventory financing costs by 33.5%.
Bioaccumulation of potentially toxic elements in fish species from aquatic environments located in crowded areas of southern Romania
Authors: P Ionescu  , V M Radu  , Gy Deak  , I E Ciobotaru  , E Marcu  , E Diacu  , M Pipirigeanu
Published: September 2020

Taking into consideration that fish are valuable bioindicators for assessing pollution with potentially toxic elements (PTEs) such as heavy metals from aquatic environments, this study aimed to assess bioaccumulation factors in relation to water (BAF) and sediment (BASF) for the following potential toxic elements: Cd, Pb, Hg, Cu, Cr, Ni and Zn from 6 different fish species (Alburnus alburnus, Carassius gibelio, Scardinius erythrophthalmus, Ameiurus nebulosus, Perca fluviatilis, Lepomis gibbosus). Fish species have been captured from the waters of the Arges River (Hotarele village area) and the Colentina River (particularly from Mogosoaia, Herastrau and Panteliom lakes), from crowded areas located in the southern part of Romania. The results of the analysis indicated BAF values > 1 for the most fish species captured from the Colentina River. BASF values > 1 were obtained for BASFPb (Carassius gibelio - Arges River), BASFNi (Scardinius erythrophthalmus - Herastaru L. and Perca fluviatillis - Pantelimon L.), BASFCr (Perca fluviatillis - Pantelimon L.) and BASFZn (Alburnus alburnus and Scardinius erythrophthalmus - Mogosoaia L. and Carassius gibelio - Pantelimon L.). The obtained results can be used to describe the transfer of these elements from water and sediments to the fish tissue.
Performance of Silica Adsorbent Material for Removing Copper Ions from Produced Water
Authors: Karm Z , Sehud R. , Dhahir A.
Published: September 2020

In this study investigation , the utilization silica for removal of copper ions from produced water by the adsorption process. Examination was carried out by studying several parameters like pH solution, adsorbent dosage and contact time. Experiments of adsorption were done at 25 ˚C . Copper ions adsorption was very influenced by the pH of solution . The maximum removal efficiency reached (99.99) when the pH was 7. The optimum removal efficiency conditions for Cu2+ using silica are pH 7, contact time 60 min, and dose of silica adsorbent 0.4 mg.
Topology influence on the radio communication range of sensor networks
Authors: Tsvetanov F. , Georgieva I. , Pandurski M.
Published: September 2020

The Internet of Things (IoT) applications use wireless technologies in order to establish Internet connection. Communication technologies such as Wi-Fi, cellular, ZigBee, Bluetooth, etc. are used to transfer data in IoT. The choice of the appropriate technology or combination of technologies depends on the type of application, its characteristics, user requirements, and other factors such as communication range, security requirements, battery life, etc. In our project, we will focus on Star, Cluster and Mesh wireless topologies, conduct comparative analysis between them, and testing different XBee devices with specialized software. The experiments are connected to the quality of the transferred data using different XBee devices and how this will affect the transmission range. The results of our research show that in terms of the range and quality of packet transmission, the cluster topology shows the best results.
Calculation and exploitation of active anti-roll system
Authors: Scurtu Ionut Cristian , Radu Andreea , Cupsa Sorin Ovidiu , Axinte Tiberiu , Stanca Costel
Published: September 2020

Today, more and more control systems of motion, are applied to different ships. Between the movement of the ship, the movement by rotation causes serious damage to the ship's equipment and their performance. There have been many efforts to invent or create certain equipment in order to eliminate these adverse effects. However, few types of equipment have had the same impact on the stabilization of the rollers and systems with active wings stabilizers. In the recent years have been carried out more research for the improvement of systems of the stabilizer fins. The anti-roll fins are a stabilization, reducing the rolling in the hull of the vessel using the elevator fin general designed on both borders of the keel.
Basic research for designing the erbium doped fiber amplifier in long distance cable communications
Authors: Sterian Andreea-Rodica
Published: September 2020

The paper presents some of the author results obtained in the research on the optical fiber amplifiers and Quantum Well (QW) laser diodes used in long distance optical communications as those transoceanic and other applications. Based on the mathematical models of the Erbium Doped Fiber Amplifier (EDFA) and of the QW laser diodes, implemented in software (especially, MATHLAB and MATHCAD but also in SIMULINK and SPICE), we get the operational diagrams and parameters of the specified devices and structures. For example, the classic Runge-Kutta method hasbeen successfully used for numerical simulation of complex nonlinear dynamics in fiber optic lasers.The obtained results are important in the design and characterization of the optical fiber communication systems, as those of the optical cables used in the naval and civil engineering.
Optimization of experimental parameters for retention of Pb(II) ions from aqueous solution on clay adsorbent
Authors: Azanfire Bianca , Bulgariu Dumitru , Nemeş Lăcrămioara , Bulgariu Laura
Published: September 2020

The removal of Pb(II) ions is an important issue for the treatment of industrial wastewater, due to its serious consequences on environment and human health. In this study a local clay material was tested as adsorbent for the retention of Pb(II) ions from aqueous solution. The proposed method can be considered low-cost, mainly due to the high availability of clay material in this region, and the high removal percent of Pb(II) ions (> 99%) allows us to say that this method has a high efficiency. Therefore, the finding of the optimal values of the most important experimental parameters which affects the efficiency of Pb(II) ions adsorption on clay adsorbent, represent the next important step in highlighting the practical applicability of this process. The most important experimental parameters, including initial solution pH,adsorbent dose, initial Pb(II) ions concentration, contact time and temperature, were analyzed in batch systems. The obtained experimental results indicates that the efficiency of adsorptionprocess is highest at initial solution pH of 7.0, 4.0 g adsorbent/L, 5 min of contact time and high temperature (50 C). Under these conditions, the removal percent of Pb(II) ions is over 99 % over the initial concentration range between 20 and 310 mg Pb(II)/L. The results of this study suggest that this clay material is an excellent adsorbent for Pb(II) ions removal and broadens the potential applicability of these materials in environmental remediation.
Evaluation of safety in arch dam using post analysis including inertia force and temperature variations of water
Authors: Rahman Alaa Jabbar , Majdi Ali , Obied Wissam Khlaf
Published: September 2020

Dams considered as one if very important infrastructure, they are lifeline structures and have a vital role our economics and social life. A concrete gravity dam is one of wide used dam worldwide, it constructed from reinforced concrete and his typical cross section is triangular, the other type is arch section. A gravity dam can be combined with an arch dam into an arch-gravity dam for areas with massive amounts of water flow but less material available for a purely gravity dam. The inward compression of the dam by the water reduces the lateral (horizontal) force acting on the dam. Thus, the gravitation force required by the dam is lessened, i.e. the dam does not need to be so massive. The aim of this paper is to obtain a preliminary post analysis for an arch gravity dam by considering of typical applied loads that effects on it. In order to check and verify the dam and ensure the assumptions used during this process, the dam is analysed in different type of major effects such as own weight, water pressure, temperature and static load intertie generated from seismic load. These loads are presented in this paper in different cases, totally five cases combined between all these factors as explain in details in the section of methodology.To achieve the target of this study, modelling of an arch dam, reservoir and foundation provided by finite element using software ANSYS. An arch dam with height of 41.5 m is studied in this paper to simulate the reality of the future dam that will be erected as accurate as possible. The response of the dams is represented by the maximum displacement of it and also the stresses in each case. The results of all analysis were compared in the five cases mentioned above to determine the impact of each case as well as the worst case affecting the safety of the dam.
Assessment of risk management and evaluate the level of risk in construction project: Case Study
Authors: Husein Akeel A , Majdi Ali
Published: September 2020

This study illustrates the risk assessment and analysis which was made as a requirement in the beginning of the project of a stadium.Risks at project are classified into ten items so that it is easy to manage and monitor them. Simple model is adopted in assessing risks such that it is easy to be understood and modified in contrast with the complex models that produce misleading. Sharing, mitigation and accepting risk are strategies adopted in the final assessment. In the case of sharing risks, it is shown that contracting strategy must be based on risk allocation. Inplanning for risk, purpose must be clear as well as responsibilities and this can be shown  precisely in a form of Risk Plan. The objective that this study serves is to identify the cost needed for the whole project from the stage of design to the finishing works.This includes all facilities in the stadium like the concrete frames, buildings and so. The study was very important to provide information to the contractor (a private company) and made confidence in that the estimated cost and time needed for achieving the objectives of the project are realistic and based on sound information.The experience gained from previous similar projects was an advantage factor in that most of problems were clear. The most important problem was the likelihood of delay, which, in the worst case will lead to dramatic increasing in costs. Therefore, the assessment of this risk was principal task in the study although it is necessary to take care for all potential risks.The study shows that risks at construction projects carried by many parties found to be changing according to internal or external changes and the change of priorities can be seen by simulating changes in ranking in each case. It is shown also that badly risk communication leads to real problems as in the case of making thought of building the stadium to be late. The cost of the delay which is the primary risk was calculated for each part of the project. For the construction activities, these were assumed to be the overhead. The time costs calculated was in maximum ($ 1,500,000) which is about (10%) of the total cost of the project.
The study of the lifting mechanism of the crane arm to a barge
Authors: Fratila C. , Axinte T. , Cojocaru R. C. , Berescu C. , Scurtu I.C.
Published: September 2020

During cargo loading and unloading, the vessels’ lifting gear, even if anchored or moored, is affected by the pitch and roll movements, in addition to the usual stresses, a similar shore crane is subjected to. This paper aims at presenting an analysis of the lifting operations of a boom crane pertaining to a self-propelled barge. The analysis starts with the meshing with triangle elements, the stresses and the embedding using the finite elements method. The crane and the pertaining boom were modeled using CAD design, NX 10.0 from Siemens. The lifting equipment of the ships boom crane may be subject to dangerous defects occurring during the loading and unloading process. Subsequently, the research emphasizes the stresses occurred in the piston rod and in the eye of the lifting equipment, using the finite element method (FEM). After the stress analysis, several fatigue matters are studied: fatigue safety factor, fatigue life, strength safety factor and crack. The damaging or breaking of the eye or of the piston rod from the lifting equipment of the ships boom crane is leading to the blocking of the cylinder with the result of unfavorable events, such as deformation of the boom crane, damaging the loads and even the danger of sinking the barge. The results of this analysis provide ship-owner and maintenance engineers a useful tool to take appropriate decision during inspection of the lifting gear of the ship, prior commencement of the loading and unloading operations.
Sustainable solution for alien algae management to reduce the environmental consequences of sea and river transport
Authors: Mateescu C , Dima A , Marin D
Published: September 2020

The accelerated development of sea and river transport over the past few decades has led to a negative phenomenon regarding the invasion and development of alien algal species, threating to modify the ecosystem functions. Algae are an attractive feedstock for biofuels production due to many advantages such as rapid growth, chemical composition rich in lipids, carbohydrates and proteins, but also because algae do not require farmland and do not create controversy in using arable land for energy purpose to the detriment of food-intended crops. Indigenous or alien algal biomass has been excessively developed in the Black Sea basin and areas affected by eutrophication, causing environmental problems. This paper presents a sustainable management solution for mitigating the negative impact of alien algae by exploiting their energy potential for producing biogas. An innovative concept of tubular bioreactor for biogas production was developed within INCDIE ICPE-CA and could be successfully applied to harness algal biomass and produce biogas for domestic and industrial use, while simultaneously ensuring sanitation of sea shore and fresh water streams.
Photo receiver with nanocluster subsystem
Authors: Kovalchuk, Volodymyr V.
Published: September 2020

The paper considers the effects associated with a change in the properties of a film heterojunction as a result of the introduction of a nanocluster subsystem.  Such a modified heterojunction exhibits a spectrally invertible photo ventile effect.  A design of a photocell containing two successively coupled p-n transitions of counter action, photoactive in different regions of the spectrum, is proposed.
The Biophysical Modeling of the Transport Phenomena in the Living Systems
Authors: Janos Vincze  , Gabriella Vincze-Tiszay
Published: September 2020

This article describes the principles of biological transport. The transport phenomena mean the variation in time and space of generalized forces when they generate flows for which conservation laws apply. After we describes: mass-, impulse-, energy- and electric-charge-transport and their mathematical characteristic equations. It emphasizes the physical aspects of transport and examines the assumptions and concepts underlying the equations most widely used to characterize transport. In the living organisms, flows are not generated only by the conjugated generalized forces, but also by the simultaneous action of other forces, so appears the cross-effects. The biophysical modeling offer a „language” of quantitative and qua­litative process­sing of experimental data, being compatible and adequate to the laws of biology.
Technologies for obtaining energy from micro-hydropower resources
Authors: Purece Cristian , Vasile Pleşca  , Lilica Corlan
Published: September 2020

Currently the global demand for electricity and drinking water is constantly increasing. Given its many economic, social and environmental benefits, hydro energy will be an important contributor to the energy mix of the future. Isolated areas, heavily underdeveloped regions, disaster-affected areas have a common need of easy-to-use means to generate electricity. The most efficient way to meet these needs involves the use of various renewable energy resources available locally. One of the main sources of renewable energy is hydro energy, more specifically micro-hydro energy. However, hydropower projects involve various considerations at different levels of project implementation. To make the most of the available hydropower potential, new models of hydraulic turbines were developed. For a cost-effective and efficient hydropower project, the selection of the hydraulic turbine must be optimally studied. The objective of the present work is to carry out a review of the optimum selection mode of the hydraulic turbine that equips a micro hydropower plant (MHP).
Graphs in maritime transports
Authors: Dragomir Cristina , Manole Ionuț Constantin
Published: September 2020

The rapid development of graph algorithms was primarily due to exponential progress known from the development of computers. Requested to participate in the process of combinatorial optimization, graphs¸ built a fund of theorems based on which a lot of algorithms have been developed that today form the toolbasic of this field. Applications of graph algorithms in various domains, from substantiating political decisions to macroeconomic issues, from production problems in the study of electrical networks, gives it an increased importance.
Responsible Ferry, Happy Employees, and Quality Services: The Study of Fair Transport in the Ferry Industry
Authors: Sum Carmen , Lau Yui Yip , Dragomir Cristina
Published: September 2020

In the context of ferry industry, fair transport is a new concept and under-researched in the academic research and industrial practitioners. The ferry operators overlook responsible ferry, happy employees, and quality services are crucial to align with the United Nations Sustainable Development Goals. The role of fair transport is still ambiguous and unawareness of the society. Also, the government bodies, policymakers, and international organizations implement ineffective measures to support the idea of fair transport in a ferry industry. The paper mainly review the current ferry industry context for the new fair transport concept, and investigate the key roles of ferry operators and international organizations in the fair transport.