bluuebunny/crossref_metadata_2025 huggingface dataset:
Firework-related Ocular Injuries During Festival Season: A Hospitalbased Study in a Tertiary Eye Care Center of Nepal
Authors: Malla Tejsu , Sahu Sabin
Published: April 2021

Introduction: Firework-related ocular injuries are an important cause of preventable ocular injuries and are common during the festival season. Despite the strict legislation in Nepal, the use of a firework is still commonly used during Tihar and Chaath festivals. Objective: To evaluate demographic distribution, mode, causative firework, type of fireworks-related ocular injuries, and visual outcome at a tertiary eye hospital in Eastern Nepal. Methods: This is a hospital-based prospective interventional study. All the patients with firework-related injuries who attended the emergency and outpatient department of SCEH, Lahan, during or within 1 month of the festival season (Tihar and Chaath puja) were included in this study. Results: Total of 65 eyes were included. The left eye was involved in 49.1%, 82.5% were males. Mean age of the patients was 15.3±14.7 years (range 5yr – 75yr). Children less than 16 years were predominantly involved (77.2%). Firecrackers (56.1%) were the most common type of fireworks causing injury. The closed globe injuries were more (78.5%) compared to open globe injuries (21.5%). Surgical management was done in 50.9% of cases. Following management visual acuity of most patients improved. Only 8 eyes (12.3%) had visual acuity less than 3/60 after management compared to 28 eyes (43.1%) at the time of presentation.

 

Conclusion: Firework related ocular injuries are important causes of preventable blindness. A combined approach of public awareness about the possible dangers, preventive measures, early treatment by trained primary ophthalmic care, and implementation of strict legislations are essential to reduce blindness due to this preventable cause.
Machine Learning and Finance
Authors: Sameer El Khatib Ahmed
Published: April 2021

The aim of this paper is provide a first comprehensive structuring of the literature applying machine learning to finance. We use a probabilistic topic modelling approach to make sense of this diverse body of research spanning across the disciplines of finance, economics, computer sciences, and decision sciences. Through the topic modelling approach, a Latent Dirichlet Allocation Technique (LDA), we can extract the 14 coherent research topics that are the focus of the 6,148 academic articles during the years 1990-2019 analysed. We first describe and structure these topics, and then further show how the topic focus has evolved over the last two decades. Our study thus provides a structured topography for finance researchers seeking to integrate machine learning research approaches in their exploration of finance phenomena. We also showcase the benefits to finance researchers of the method of probabilistic modelling of topics for deep comprehension of a body of literature, especially when that literature has diverse multi-disciplinary actors.
Changes In Hormonal Response Caused By Different Types Of Physical Exercise
Authors: Araújo Flávio Henrique Souza de , Primo Raquel Borges de Barros , Olimpio Mi Ye Marcaida , Silva Nathalia Oliveira da , Yoshikawa Catherine Alexia , Tanaka Lígia Harumi Vilela Bartnick , Freitas Vinício Guimarães , Pereira Luiz Fernando Benazet de Assunção , Bachega Thais Gimenes , Oesterreich Silvia Aparecida
Published: April 2021

The regular practice of physical exercises brings benefits to health, as long as it is done correctly. Therefore, it is essential to know the type of activity practiced and its relationship with the individual's organism, especially regarding the endocrine response. The objective of this study was to investigate the main hormonal axes that act in physical exercises and to understand their different responses according to the type of activity. A literature search was carried out in the Scielo, PubMed, and VHL databases with the combinations "exercise AND hormones", "sports AND endocrine", "endocrine regulation AND exercise", and "endocrine regulation". After analysis, seven studies were selected for the development of this paper. The physical exercises were divided into two modalities - strength and endurance - which vary according to the homeostatic change imposed on the body. The responses were analyzed according to the acting hormonal axis, as follows: hypophysary, by the action of a hormonal cascade; adrenal, catecholamines and cortisol; and pancreatic, represented by insulin and glucagon. This review revealed the modulation of endocrine responses varies whether the activity is one of strength, which relates to anaerobic processes, or endurance, which interacts with the cardiovascular system. Therefore, it is recommended that further studies be conducted on this subject so that the practice of physical exercises suits each individual's uniqueness and may contribute to the prevention and treatment of diseases.
Effect of Students’ Attendance on their Academic Performance in Some Engineering Courses at the United Arab Emirates
Authors: Mourad Abdel Hamid Ismail , Selim Mohamed YE , Al–Maqdi Shafaa , Abueleyan Ghadi , Mansour Aya , Alamer Moudi , Alantali Maryam
Published: April 2021

The correlation between students’ attendance and their final grades was studied by many researchers in many universities across the world in a number of specializations.  The aim of this study is to investigate the effect of absence on engineering students’ performance in general engineering courses and more specifically in fundamental courses that are provided solely by the Mechanical Engineering Department since there had been a substantial lack of studies involving them. In order to do so, a sample size of over 8000 students from the United Arab Emirates University UAEU was collaborated for this study with a main objective to conclude whether this relationship is significant or not. The data was generally collected over a period of five years, from 2013 to 2018. From the research conducted, the results showed that, students who do not attend class tend to perform worse on exams in engineering. Furthermore, the correlation between the student’s class attendance and student’s final grade is noteworthy and there is a strong correlation between them. Equally important, such low students’ academic performance reflects negatively to the course learning outcomes.
A Trickle of Authority: The Arid Conditions of Empire in Eighteenth-Century Xinjiang
Authors: Bello David Anthony
Published: April 2021

This article will explore some of the Qing Empire's primary adaptations, mainly pastoral and agricultural, to the arid environments of southern, eastern and northern Xinjiang - that is, the Tarim, Hami-Turfan and Zünghar basins respectively. It first examines the region's arid climate and its constraining implications for, first, agriculture as the empire's standard form of territorial incorporation in the south and east; and, second, pastoralism and agro-pastoralism in the north. These relations were not purely social, but were conditioned within both human and natural parameters. Xinjiang's general aridity informed Qing interactions with the territory's diverse peoples, which presented both cultural and ecological - that is, environmental - obstacles and opportunities.
MRONJ ASSOCIATED WITH DENTAL INFECTION AND SECONDARY INVOLVEMENT OF THE NEARBY IMPLANT: A CASE REPORT
Authors: Nespoli Stefania , Audino Elisabetta , Visconti Luca , Daleffe Francesco , Castellani Andrea , Negrini Stefano , Salgarello Stefano , Mensi Magda
Published: April 2021

BACKGROUND: Medication related osteonecrosis of the jaw (MRONJ) represents a potential adverse effect related to the treatment with antiresorptive (Bisphosphonates, Denosumab) and antiangiogenic (Tyrosine kinase inhibitors, Vascular endothelial growth factor inhibitors) drugs. This condition could occur in patients that take these agents for the treatment of skeletal and oncological diseases but have no history of radiation therapy to the jaws. MRONJ is characterized by exposed bone or bone that can be probed through an intraoral or extraoral fistula in maxillofacial region that has persisted for longer than 8 weeks [1]. The risk to develop osteonecrosis increases with local factors, especially dental infection and dentoalveolar surgery such as tooth extraction.

CASE PRESENTATION: This report describes a case of bisphosphonate related to osteonecrosis of the jaw associated with tooth infection and subsequent involvement of the nearby implant. 

CONCLUSION: The aim of this case is to describe the decision-making and clinical management of MRONJ carried out in ambulatory way and underline the importance of anamnesis and early diagnosis.
Head injury of Vietnamese pedestrian in crash accident with SUV using numerical simulation
Authors: Hùng Anh Lý , Nguyen Dinh Bao , Nguyen Anh Huy
Published: April 2021

Crash test simulation using finite-element method is more and more popular in the automobile industry because of its feasibility and cost saving. The majority of finite element dummy models used in crash simulation are built based on anthropometrical and biomechanical data of the USA and European bodies. Thus, it is necessary to develop a scaling algorithm to scale a reference dummy size into a desired one without rebuilding the entire model. In this paper, the Hybrid III dummy model provided by LS-DYNA software is scaled to suit Vietnamese biomechanical characteristics. Then a standard criterion for head injuries called HIC is introduced. In addition, the Hybrid III dummy model is validated by comparing experimental data with simulation results obtained from computer model.
LLC Inverter Design Procedure for Induction Heating with Quantitative Analysis of Power Transfer
Authors: NGO THUONG PHI , Nguyen Nam Quang
Published: April 2021

The paper explains the operating principle of an LLC resonant circuit for induction heating applications. Although induction heating has attracted a great deal of attention in recent years, very little consideration on designing the inductor in the resonant circuit for specific requirements has been done. Specifically, a design procedure with the required power and work-head dimension as inputs is still needed, from a practical point of view. In this paper, a quantitative analysis of power transferred to the work-head will be done to help design the resonant circuit. A design procedure for the LLC circuit will be proposed, utilizing results from the quantitative power analysis and taking into account mechanical constraints on the work-head. In addition, a simple technique to monitor the soft switching condition of the power switches in the resonant inverter, utilizing only voltage signals, is also proposed. The feasibility of the proposed design procedure will be demonstrated and verified by simulations and experiments.
Study on parameters on cutting AAC by wires
Authors: Tùng Lưu Thanh
Published: April 2021

Autoclaved Aerated Concrete (AAC) is a Lightweight, Load-bearing, High-insulating, Durable building product, which is produced in a wide range of sizes and strengths. AAC Blocks is lightweight and when compared to the red bricks, AAC blocks are three times lighter. AAC block is rapidly developing in Vietnam. The block has more advantages such as precast, and easy installation. AAC is produced from the common materials: lime, sand, cement and water, and a small amount of rising agent. After mixing and molding, it is then autoclaved under heat and pressure to create its unique properties. Then, the AAC block will be cut into block brick by steel wire. When cutting the ACC block, the block brick surface must be smooth so that it is unnecessary to mortar. Furthermore, the roughness of the surface must be smaller than 0.1mm to paint the wall easily. The block dimension also need high precision so that the wall will be straight when blocks are superposed. However, in this paper, the roughness of the block surface will be only researched because the roughness will decide the cost, and the dimension decide the estheticism of wall. The block is made by using steel wires to cut big AAC blocks into small blocks. Effects of processing parameters on the performance of the steel wire sawing processes are wire speed, feed rate and tension. Each parameter will affect surface quality with different effects. In addition, these parameters affect each other, which causes scratches on the AAC surface. Experiments will be made to measure the height of roughness with the change of wire speed, feed rate and tension. The best parameters will be found, which helps the AAC manufacturer to obtain the higher quality.
Study on a protection coordination approach for over-current relays in distribution generator-integrated distribution networks
Authors: Lê Phúc Duy , Nguyễn Hoan Thanh , Huỳnh Phúc Công , Bùi Dương Minh , Đoàn Minh Ngọc , Nguyễn Phương Thanh , Trần Khang Nguyên
Published: April 2021

Sự hiện diện của nguồn phân tán DG (Distributed Generator) đã gây ra những thách thức đến việc duy trì độ tin cậy của những OCPR quá dòng OCPR (Over-current Protection Relay) khi hoạt động để bảo vệ lưới điện phân phối (LĐPP). Trong quá trình vận hành để đảm bảo cung cấp điện cho LĐPP, những đặc tính vận hành của nguồn DG đã làm thay đổi đáng kể giá trị dòng điện sự cố và đây là nguyên nhân chính dẫn đến những hiện tượng OCPR hoạt động không tin cậy, chẳng hạn như mất tính chọn lọc, giảm độ nhạy, hoạt động vượt cấp hoặc hoạt động đồng thời. Do đó, việc điều phối những OCPR thuộc hệ thống bảo vệ trên LĐPP có xem xét đến những đặc tính vận hành của nguồn DG nhằm đảm bảo tính phối hợp khi hoạt động là cần thiết. Trong nghiên cứu này, nhóm tác giả sẽ giới thiệu về một phương pháp điều phối bảo vệ OCPCO (Over-current Protection Coordination Optimization) dành cho hệ thống bảo vệ của LĐPP có tích hợp nguồn DG. Cụ thể, phương pháp OCPCO này được phát triển dựa vào việc sử dụng kết quả phân tích ngắn mạch kết hợp với giải thuật tìm kiếm GSA (Gravitational Search Algorithm) để xác định các hệ số điều phối A, B, C và TDS (Time Dial Setting) phù hợp với từng trạng thái vận hành của LĐPP có tích hợp nguồn DG, đặc biệt là sau khi LĐPP đã được tái cấu trúc để cách ly sự cố và khôi phục cung cấp điện. Thông qua hàm mục tiêu về tổng thời gian đảm bảo phối hợp CTI (Coordination Time Interval) cho phép giữa những OCPR liền kề nhau, phương án điều phối trị số chỉnh định sẽ được đề xuất và cập nhật đến từng OCPR thông qua hạ tầng mạng truyền dẫn thông tin. Mô hình LĐPP có tích hợp nguồn DG được nhóm tác giả xây dựng dựa vào LĐPP thực tế bằng phần mềm ETAP, để phục vụ cho việc phân tích ngắn mạch và kiểm tra tính khả thi của phương pháp OCPCO đề xuất. Hơn nữa, kết quả điều phối bảo vệ bằng giải thuật GSA sẽ được so sánh với những kết quả xuất ra từ giải thuật PSO&GSA và GA nhằm làm cơ sở kiểm tra tính phù hợp khi điều phối những OCPR trên LĐPP có tích hợp nguồn DG.
Research and manufacture of external non-circular gear-pair with improved cycloid profile of the ellipse
Authors: Nguyen Thai Hong , Nguyen Trung Thanh , Nguyen Viet Hoang
Published: April 2021

Non-circular gears (NCGs) are known as an alternative to conventional mechanical mechanisms in continuous speed converters. In which, the gear profile is the factor that directly affects the performance and quality meshing of the non-circular gear. However, the types of curves that are being used to generating profiles of the non-circular gears still exist limited in meeting the conditions of undercutting and uniformity of tooth sizes at different positions on the centrode. To optimize the profile of the non-circular gear, the paper presents a new profile in which the traditional involute profile of the non-circular gears is replaced by an improved cycloid curve of the ellipse. The mathematical model of new profile of non-circular gear is formed by eccentric circular shaper cutter with the improved cycloid of the ellipse in accordance with the theory of gearing in consideration of undercutting conditions. Based on the mathematical model established by this research, a program was written in Matlab. On that basis, a pair of non-circular gear was designed and fabricated experimentally on a wire breaker to verify the theory. The results show that with the new tooth profile design scheme, the shortcomings of uneven teeth on the non-circular gear of the traditional studies when using the involute profile of the circle have been overcome.
Space-vector modulation for three-phase indirect matrix converters to reduce common-mode voltage
Authors: Tran Hoan Quoc , Vu Tien Manh , Nguyen Tuyen Dinh
Published: April 2021

This paper presents a space vector modulation strategy for a three-phase indirect matrix converter to reduce the common-mode voltage and maintain the output performance. To reduce the peak value of the common-mode voltage to 57.7% of the input phase voltage, three active voltage vectors are used to generate the desired output voltage with arbitrary amplitude and frequency, instead of using both active and zero voltage vectors as in the traditional space vector modulation strategy. Although the common-mode voltage is reduced, the output waveform quality of the three-phase indirect matrix converter deteriorates due to the absence of the zero voltage vectors. To overcome this problem, the proposed space vector modulation strategy is redesigned to control the rectifier stage of the indirect matrix converter by utilizing three active current vectors instead of two as usual. Consequently, the constant average dc-link voltage is achieved, which can improve the output performance in terms of the output voltage and current harmonic distortion. The simulation is implemented by PSIM software and experimental results are provided to verify the effectiveness of the proposed space vector modulation strategy.
Kas İskelet Sistemi Ağrısı ile Başvuran Hastalarda Nöropatik Ağrı Sıklığı
Authors: ERTEM Uğur , İRDESEL Jale
Published: April 2021

Ağrı, bireyin hayatında en çok karşılaştığı hastalık semptomlarındandır. Fizik tedavi ve rehabilitasyon doktorları için de kas iskelet sistemi ağrıları meslek hayatında en sık karşılaştıkları problemlerdendir. Nöropatik ağrı, ağrının alt tiplerinden birisidir. Somatosensoriyel sistemin etkilenmesiyle meydana gelen ve klasik ağrının aksine uyuşma, karıncalanma, yanma gibi bulgularla seyreden kompleks bir durumdur. Bu çalışmada amaç, kas iskelet sistemi ağrısıyla başvuran hastalarda nöropatik ağrı sıklığını ve ilişkili olabilecek faktörleri araştırmaktır. Polikliniğe kas iskelet sistemi ağrısıyla başvuran hastalar çalışmaya dahil edildi. Hastaların ağrı durumunun değerlendirilmesi için Nöropatik Semptom ve İşaretlerin Kendi Kendine Değerlendirilmesi (S-LANSS) skalası ve görsel analog skala (VAS) uygulandı. Çalışmaya dışlama ve katılma kriterlerine uyan 181 hasta alındı. Kas iskelet sistemi ağrısı olan hastaların %29,3’ünde nöropatik ağrının eşlik ettiği tespit edildi. Yaşın artmasıyla nöropatik ağrı sıklığı istatistiksel olarak anlamlı şekilde yüksek bulunurken, diğer değişkenlerle nöropatik ağrı oluşumu arasında anlamlı ilişki saptanmadı. Sonuç olarak, kas iskelet sistemi ağrısı ile polikliniğe başvuran hastalarda nöropatik ağrı sıklığı yüksek bulunmuştur. Sonuçlar bu iki durumun birlikteliğinin sıklığı nedeniyle kas iskelet sistemi ağrılı hastaların tanı ve tedavisinde nöropatik komponentinin de dikkate alınması gerektiğini düşündürmektedir.
Efeitos do isolamento social para a saúde de pessoas idosas no contexto da pandemia de Covid-19: um estudo de revisão integrativa
Authors: Bezerra Gisele Kariny de Souza Davi , Sousa Ana Carolina Patrício de Albuquerque , Araújo Maria Clara Medeiros , Lucena Giminiana Aline de , Fernandes Lucca Ferdinando Queiroz , Morais Pedro Henrique de Medeiros , Coelho Larissa de Menezes Albuquerque , Barbosa Isabelle Canuto Rabelo , Beserra Eric Cymon do Vale
Published: April 2021

Introdução: O processo de senescência leva ao declínio da capacidade funcional cognitiva e de respostas adaptativas que são necessárias para a execução de atividades de vida diária, levando ao maior risco de morbidade e mortalidade. Estudos comprovam que o envelhecimento pode estar associado ao isolamento social, no qual leva a diversos prejuízos para saúde física e mental. Em dezembro de 2019, o primeiro caso do novo coronavírus foi registrado e, para conter a transmissão, foram adotadas medidas sanitárias, dentre elas o isolamento social. Objetivo: Investigar os efeitos do isolamento social para a saúde física e mental em pessoas idosas durante a pandemia de COVID-19. Métodos: Trata-se de um estudo de revisão integrativa, realizado de forma sistemática elaborado a partir da pergunta norteadora “Quais os efeitos do isolamento social da pandemia de COVID-19 para a saúde física e mental em pessoas idosas?”. Resultados: Os estudos priorizaram os efeitos na saúde mental da população idosa, havendo necessidade de ampliar a investigação para a saúde física da população idosa, no contexto de isolamento social.
Efeitos de diferentes técnicas extrativas na obtenção da β-ecdisona proveniente de Pfaffia glomerata: um estudo de revisão
Authors: Bertoco Júnior Fábio Dias , Marquezi Laura Correia , Sakai Otavio Akira , Terhaag Marcela Moreira
Published: April 2021

A Pfaffia glomerata é uma planta da família Amaranthaceae, presente naturalmente em inúmeras regiões brasileiras, com propriedades medicinais e usualmente empregada como anti estresse, para o aumento da imunidade e como afrodisíaco. Estas características se devem à presença da β-ecdisona, uma saponina presente exclusivamente nesta espécie e que possui grande valor comercial. Sendo assim, torna-se de interesse industrial e científico metodologias que otimizem a extração da β-ecdisona. Este trabalho objetivou realizar uma revisão de literatura verificando a influência dos métodos extrativos e demais fatores no rendimento da extração da β-ecdisona. Assim, foi elaborado um estudo de levantamento bibliográfico em três plataformas digitais: Google Acadêmico, SciELO e Periódicos Capes, selecionando artigos publicados no período entre 2015-2020. Após adequada seleção de materiais científicos, analisou-se em 12 artigos científicos parâmetros relativos à extração da β-ecdisona, tais como métodos, tipos e concentração de solventes, além de condições de extração, tais como tempo, pressão e temperatura. Em seguida, identificou-se quais os parâmetros extrativos empregados nestas pesquisas resultaram em um maior teor de β-ecdisona. Verificou-se que a maioria dos autores empregaram solventes orgânicos polares devido à alta polaridade da molécula, que ocorre por conta das ligações entre átomos de hidrogênio e oxigênio, e extração por maceração, em função da facilidade e do baixo custo de operação. Pesquisas apontaram que temperaturas entre 333 e 393K aumentaram o rendimento da extração, mas que acima de 393K levam a degradação da molécula. Em relação à pressão da extração, pesquisas indicam que não houve aumento no rendimento em pressões acima de 10MPa.
Profil Histokimia dan Analisis In Silico Senyawa Metabolit Sekunder pada Daun Zaitun (Olea europaea L.)
Authors: Maghfiroh Lailatul , Rahayu Tintrim , Hayati Ari
Published: April 2021

Olive (Olea europaea L.) is a plant that is native of the Mediterranean region which was also able to grow in Indonesia. The plants contain secondary metabolite that will be useful for a survival of a certain species. One of the tests to know a compound of the secondary metabolite on the leaves of zaitun is the histochemical analysis. The knowledge about secondary metabolite containing on a tissue of cell can be done the continued testing for ensure secondary metabolite profile of the compound in form of 3D molecular structure that is using in silico analysis. The research aimed to know the histochemical profile and structure of 3D molecular secondary metabolite of olive leaves. The method was used descriptive-qualitative and the research was done two stages; histochemical testing and was continued with visualization of the chemical structure by ‘in silico’ method in form of chemical structure 3D image. The result showed that histochemical analysis at five these secondary metabolites contained in olive leaves; the terpenoids, an alkaloid, phenolic, lipophilic, and flavonoid. While the tannin compound undetectable. All these secondary metabolite containing in olive leaves can be seen in form of 3D structure.Keywords: Olive (Olea europaea L.), secondary metabolites, histochemical, In silicoABSTRAKZaitun (Olea europaea L.) merupakan tanaman yang berasal dari daerah Mediterania yang juga dapat tumbuh di Indonesia. Tanaman zaitun mengandung metabolit sekunder yang bermanfaat untuk pertahanan hidup suatu species tertentu. Salah satu pengujian untuk mengetahui senyawa metabolit sekunder pada daun zaitun adalah dengan analisis histokimia. Pengetahuan tentang kandungan metabolit pada suatu jaringan sel dapat dilakukan pengujian lanjut untuk memastikan profil senyawa metabolit sekunder tanaman dalam bentuk struktur 3D molekular, yaitu menggunakan analisis In silico. Penelitian bertujuan untuk mengetahui profil histokimia dan struktur molekuler 3D metabolit sekunder daun zaitun. Metode penelitian yang digunakan adalah deskriptif kualitatif dan penelitian ini dilakukan dengan 2 tahapan; uji histokimia dan dilanjutkan dengan visualisasi struktur kimia metode in silico berupa struktur kimia gambar 3D. Hasil penelitian menunjukkan bahwa analisis histokimia pada lima metabolit sekunder terkandung pada daun zaitun yaitu terpenoid, alkaloid, fenolik, lipofil, dan flavonoid. Sedangkan senyawa tannin tidak terdeteksi. Semua senyawa metabolit sekunder yang terkandung pada daun zaitun dapat dilihat dalam bentuk struktur 3D.Kata kunci: Zaitun (Olea europaea L.), Metabolit sekunder, Histokimia, In silico
Subsitusi Fitohormon Dengan Air Kelapa (Cocos nucifera L.) pada Medium Vacin and Went Terhadap Pertumbuhan Eksplan Anggrek Dendrobium sp Secara in Vitro
Authors: Gumiwang Wulan Dari Neng , Rahayu Tintrim , Hayati Ari
Published: April 2021

The purpose of this research is to determine the concentration of young coconut water that is appropriate for the growth of orchid plantlets (Dendrobium sp.) In vitro. This study used an experimental method, descriptive data analysis to compare several different concentrations of coconut water. The design of this study uses a completely randomized design (CRD). The treatments consist of 0% coconut water concentration (as a control), 15%, 30% and 60%. Each concentration was carried out 5 replications and each repetition consisted of 5 Dendrobium sp plantlets in each culture bottle conducted for 40 HST, for observing the root length carried out for 50 HST. The highest number of shoots and leaves were produced at the same concentration, namely 150 ml / L coconut water treatment (15% concentration) with an average of 2.8 shoots and the average number of leaves 10.8 leaves. The average number of roots and the longest root length was produced at a concentration of 600 ml / L coconut water (60% concentration) with an average of 6 roots, and the longest root length was 0.5 cm.Keywords: Young coconut water, (Cocos nucifera L.), Dendrobium sp., in vitro, growth.ABSTRAKTujuan penelitian ini ialah menentukan konsentrasi air kelapa muda yang tepat untuk pertumbuhan planlet anggrek (Dendrobium sp.) secara in vitro. Penelitian ini menggunakan metode eksperimen, analisis data secara deskriptif untuk membandingan beberapa konsentrasi air kelapa yang berbeda. Rancangan penelitian ini menggunakan Rancangan Acak Lengkap (RAL). Perlakukan terdiri dari konsentrasi air kelapa 0 % (sebagai kontrol), 15% , 30% dan 60%. Masing-masing konsentrasi dilakukan 5 kali ulangan dan setiap ulangan terdiri dari 5 planlet Dendrobium sp dalam setiap botol kultur yang dilakukan selama 40 HST, untuk pengamatan panjang akar dilakukan selama 50 HST. Jumlah tunas dan jumlah daun terbanyak dihasilkan pada konsentrasi yang sama, yaitu perlakuan air kelapa 150 ml/L (konsentrasi 15%)  dengan rata-rata jumlah tunas terbanyak 2,8 tunas dan rata-rata jumlah daun terbanyak 10,8 helai daun. Rata-rata jumlah akar terbanyak dan panjang akar terpanjang dihasilkan pada konsentrasi air kelapa 600 ml/L (Konsentrasi 60%) dengan rata-rata jumlah akar terbanyak sebanyak 6 akar, dan rata-rata panjang akar terpanjang 0,5 cm.Kata kunci : Air kelapa Muda (Cocos nucifera L.), Dendrobium sp., in vitro, pertumbuhan
Estimasi Karbon pada Tegakan Kopi di Lahan Agroforestri Desa Pandansari Kecamatan Poncokusumo Kabupaten Malang
Authors: Najih Riyan Riyadlun , Hakim Luchman , Zayadi Hasan
Published: April 2021

The agroforestry system is a solution offered so that the forest area does not decrease due to forest destruction and the environment is able to perform its function, namely as a carbon storage. This study was aimed to determine the potential for carbon stored in coffee stands and abiotic factors in coffee stands on agroforestry land. Samples by purposive sampling stand samples of Coffeaarabica, Coffea canephora, and Coffea liberica as many as 20 trees with a total sample of 60 stands. the abiotic factor was measured at three representative points. Data obtained in the form of dbh (±1,3 m), type of coffee, plant age, wood dencity, abiotic factor data, biomass, and carbon. Data analysis included tree biomass data with the allometric formula Ketterings dry weight = 0.11 ρ D2.62 (2001) and  allometric formula Arifin dry weight = 0.281 D2.0635 (2001). Data analysis included carbon biomass = dry weight x 0.47. The results showed that the largest carbon storage was in Coffea liberica, then Coffea canephora and the smallest carbon storage was in Coffeaarabica. abotic factors in coffee agroforestry show soil moisture 18.3%, air humidity 60 - 75%, soil pH  7.3, soil temperature  21 ° C, air temperature 21 - 25 ° C, light intensity  877 lux, and altitude ranges from 906 - 934 m asl.Keywords: allometric, coffee, agroforestry, abiotic factors, carbonABSTRAKSistem agroforestri merupakan solusi yang ditawarkan agar luas hutan tidak semakin berkurang akibat kerusakan hutan dan lingkungan mampu melakukan fungsinya yakni sebagai penyimpan karbon. Penelitian ini bertujuan untuk mengetahui potensi karbon tersimpan pada tegakan kopi dan faktor abiotik pada tegakan kopi di lahan agroforestri. Pemilihan sampel tegakan kopi secara purposive sampling, tiap sampel tegakan Coffea arabica, Coffea canephora, dan Coffea liberica berjumlah 20 pohon dengan jumlah total sampel 60 tegakan. Faktor abiotik diukur pada tiga titik representatif. Data yang diperoleh berupa dbh (±1,3 m), spesies kopi, umur tanaman, berat jenis kayu,data faktor abiotik, biomassa, dan karbon. Analisis data perhitungan biomassa meliputi rumus allometrik Ketterings berat kering = 0,11 ρ D2,62  (2001) dan rumus allometrik Arifin berat kering = 0,281 D2,0635(2001). Analisis data biomassa karbon = berat kering x 0.47. Hasil penelitian menunjukkan simpanan karbon terbesar terdapat pada Coffea liberica, kemudian Coffea canephora dan simpanan karbon paling kecil pada Coffea arabica. faktor abotik di agroforestri kopi menunjukkan kelembaban tanah 18.3%, Kelembaban udara 60 - 75%, pH tanah 7,3, Suhu tanah 21°C, suhu udara 21 - 25°C, intensitas cahaya 877 lux dan ketinggian tempat berkisar 906 – 934 m dpl.Kata kunci: allometrik, kopi, agroforestry, faktor abiotic, karbon
pesquisa em eficácia escolar a partir de uma perspectiva interdisciplinar
Authors: Mariatt de Oliveira Champangnatte Dostoiewski , Freire da Rocha Arana Andressa Maria , De Oliveira Rosane Cristina
Published: April 2021

O presente artigo problematiza a pesquisa em eficácia escolar considerando os fatores intra e extraescolares que influenciam a qualidade da educação brasileira, propondo um olhar interdisciplinar sobre o tema. Neste trabalho, consideramos a interdisciplinaridade como um conjunto de olhares para além da disciplinaridade, que permite aprofundar os estudos sobre eficácia escolar. Ao definir e compreender qualidade no contexto educativo, faz-se necessário avaliar as dimensões sociais, políticas, pedagógicas e econômicas que envolvem direta e indiretamente os resultados de aprendizagem. Considera-se nesta análise que a escola eficaz é aquela em que o aluno tem condições de desenvolver habilidades humanas e cognitivas necessárias à sua formação e integração social. Do ponto de vista do método, apresenta-se o etnográfico como uma possibilidade importante de pesquisas sobre eficácia escolar. Neste sentido, o texto contextualiza o surgimento das pesquisas em eficácia escolar, apresentando suas definições, objetivos de estudo e discute as concepções acerca das políticas públicas para o avanço da qualidade no cenário educacional.
Percepção do conceito "professor" em alguns professores da 6ª classe de ensino primário da escola Mpunzi-Nzau, Cabinda, Angola
Authors: Luemba Sambo Domingos Sebastião , Mavungo Ressamo Rosa
Published: April 2021

O tema é fruto de comportamento inadequado de certos professores que atuam na 6ª classe, na escola do ensino primário "Mpunzi Nzau", em Cabinda, Angola. Por vezes, tratam os seus alunos de “burros”, os ofendem e dificilmente aceitam espaço de discussão da matéria. Nessa senda, desenvolveu-se esta pesquisa cujo objetivo geral foi de perceber o sentido que atribuem ao conceito de professor. Objetivos específicos, de fazer abordagem teórico-metodológica sobre professor e, compreender, através de entrevistas, como alguns professores da 6ª classe da escola em causa entendem o conceito professor. Usaram-se os métodos observação, indução, bibliográfico, descritivo e a entrevista. Os principais resultados mostram que há reclamações de alunos diante de condutas de alguns professores durante as aulas. E entre os professores, também há quem reclame no modo de agir de outros colegas. A pesquisa concluiu que os professores têm domínio do conceito professor, mas poucos colocam em prática o que aprendem durante a formação, para o exercício da profissão docente.
É pique, é pique-bandeira fração
Authors: Lemos Barcellos Zeferino Joycimar , Galvão Rosa Costa João Augusto
Published: April 2021

Este estudo tem como objetivo narrar a experiência da aplicação do jogo pique-bandeira fração construído a partir da perspectiva interdisciplinar entre as disciplinas Matemática e Educação Física em turmas do 5º ano do Ensino Fundamental de uma instituição federal de ensino. Sua relevância destaca-se pela iniciativa dos professores das disciplinas em romper com a linearidade e com as fragmentações do processo de ensino-aprendizagem, visando mobilizar uma atitude interdisciplinar no colégio. Caracteriza-se como um estudo qualitativo por meio do relato de experiência e observação participante. Os instrumentos utilizados foram os cadernos dos professores e as imagens como fonte do processo. Concluímos que o jogo interdisciplinar se constitui não apenas como meio e fim do processo de ensino, mas como potência na exploração de outras estratégias didáticas. Destacamos a roda de conversa realizada no início e ao final da aula como ferramenta avaliativa e dialógica que se destacou durante a vivência do jogo.
Öz-Düzenlemeli Öğrenmenin Görsel Sanatlar Öğretmeni Adaylarının Sanat Eleştirisi Dersine Yönelik Akademik Başarılarına ve Kalıcılığa Etkisi
Authors: DEMİR Güneş
Published: April 2021

Bu araştırmanın amacı öz düzenlemeli öğrenme yaklaşımının görsel sanatlar öğretmeni adaylarının sanat eleştirisi dersine yönelik akademik başarılarına ve kalıcılığa etkisini incelemektir. Nicel araştırma yöntemlerinden deneysel yöntemin ön test son test kontrol gruplu yarı deneysel modeli ile gerçekleştirilen araştırmanın çalışma grubunu, 2014-2015 Güz Döneminde, Atatürk Üniversitesi Kazım Karabekir Eğitim Fakültesi Resim İş Eğitimi Ana Bilim Dalı’nda öğrenim gören 38 öğretmen adayı oluşturmaktadır. Araştırmada öz düzenlemeli öğrenmenin görsel sanatlar öğretmeni adaylarının akademik başarılarına etkisini kontrol etmek için akademik başarı testi kullanılmıştır. Dersler deney grubunda öz düzenlemeli öğrenme yaklaşımına uygun olarak, kontrol grubuna ise sunuş yoluyla öğrenme yaklaşımına dayalı olarak işlenmiştir. Verilerin analizinde SPSS 19 Paket Programı kullanılmıştır. Non-parametrik verilerin toplanması için "İlişkisiz Ölçümler İçin Mann Whitney U-Testi", öntest-sontest, son test- kalıcılık puanlarını karşılaştırmak için non-parametrik istatistik tekniklerinden "İlişkili Ölçümler İçin Wilcoxon İşaretli Sıralar Testi" kullanılmıştır. Araştırma bulgularına göre; deney ve kontrol gruplarının son test puanlarına bakıldığında her iki öğrenme ortamında da akademik başarıda belli bir artış gözlenmiştir. Deney grubu ile kontrol grubu son test puanları karşılaştırıldığında; deney grubundakilerin akademik başarılarının kontrol grubundakilere göre daha yüksek olduğu görülmektedir. Bu bulgu; öz düzenlemeye dayalı öğretimin daha etkili bir öğrenme ortamı sağladığını ve öğrencilerin akademik başarılarını arttırmada daha etkili olduğunu göstermektedir. Ayrıca; deney ve kontrol gruplarının kalıcılık puanlarına bakıldığında her iki öğrenme ortamında da yapılan öğretimin kalıcılığını sürdürdüğü görülmüştür. Deney grubu ile kontrol grubu kalıcılık puanları karşılaştırıldığında; deney grubunun kalıcılık puanları kontrol grubuna göre daha yüksektir. Araştırma sonuçlarına dayanarak; öz düzenlemeli öğrenme yaklaşımının öğretmen adaylarının akademik başarılarına ve sanat eleştirisi dersi tutumlarına olumlu yönde etki ettiği söylenebilir.
The Relationship between Initiative Taking Levels and Problem Solving Skills of School Administrators
Authors: TEKİN Tarık , AKIN Uğur
Published: April 2021

This research aims to examine the relationship between initiative taking levels and problem solving skills of school administrators. The research was designed as a descriptive relational survey. The sample consists of 282 preschool, primary, secondary and high school administrators working in public schools from a central Black Sea Region province of Turkey. Data were collected through the Personal Initiative Measurement Tool for School Principals and the Problem Solving Inventory. Relationships were tested through Pearson’s correlation and multiple linear regression analyses. Results indicated that there were negative significant relationships between the impulsive and avoidant problem solving styles and all sub-dimensions of taking initiative, while the relationships were significant and positive for reflective style, problem solving confidence, monitoring, and planfulness. Multiple linear regression analyses showed that the most powerful predictor of school administrators’ taking initiative was the problem solving confidence. It was concluded that supporting school principals for effective problem solving skills may increase their level of taking initiative.
Özel Okullarda Öğrenim Gören Ortaokul Öğrencilerinin Müzik Dersine Yönelik Tutumlarının Tespitine Yönelik Bir Tutum Ölçeği Geliştirilmesi
Authors: ÜSTÜN Hamza
Published: April 2021

Bu çalışmada; özel okullarda öğrenim gören ortaokul öğrencilerinin müzik dersine karşı olan tutumlarının ölçülmesinde kullanılabilecek bir ölçek geliştirilmesi ve süreçleri ele alınmıştır. Araştırmada likert tipi tutum ölçeği modelinden faydalanılmıştır. Uzman görüşlerinden yararlanılarak geliştirilen ve toplam 16 madde ile 4 alt boyuttan oluşan ölçeğin, geçerlik ve güvenirlik çalışmaları, Ankara ilinde özel okullarda aktif olarak öğrenim görmekte olan 146 öğrenci aracılığı ile elde edilmiştir. Belirlenen alt boyutlar bilişsel, duyuşsal, davranışsal ve devinimsel olarak adlandırılmıştır. Analiz için IBM SPSS istatistik 22 paket programı kullanılmıştır. Özel Ortaokul Öğrencilerinin Müzik Dersine Yönelik Tutum Ölçeği'nin yapı geçerliliğini ortaya koymak maksadıyla faktör çözümlemesi yapılmış olup, yapılan analizde varimax dönüşümlü temel bileşenler çözümlemesi metodu kullanılmıştır. Hazırlanan yapının güvenirliği için iç tutarlık sayısı (Cronbach Alfa) ve bu bağlamda soruların toplamlarının korelasyonları hesaplanmıştır. Toplam dört ana faktörden oluşan ve faktör ağırlıklarının 0.62 ile 0.84 aralığında farklılaştığı, Kaiser-Meyer Olkin (KMO) değerinin 0.71, güvenirliğin sağlanması için analiz edilen iç tutarlılık kat sayısı (Cronbach Alfa) değerinin 0.75 olduğu belirlenmiştir. Bu bulgulardan hareketle, geliştirilen ölçeğin özel okullarda öğrenim gören ortaokul öğrencilerinin müzik dersine yönelik tutumlarını belirlemede kullanılabilecek, geçerlik ve güvenirlik değerlerinin yeterli düzeyde bulunduğu bir araç olduğu belirlenmiştir.
ДОСЛІДЖЕННЯ УСПІШНОСТІ СТУДЕНТІВ З ПРОБЛЕМАМИ СЛУХУ
Authors: Дорош Наталія , Астіон Юлія , Петречук Ліна
Published: April 2021

Проведено дослідження загальних показників та успішності студентів, які відносяться до Регіонального центру освіти інвалідів Національної Металургійної академії України (РЦОІ). Приймаючи до уваги, що Металургійна академія є єдиним закладом IV рівня акредитації в Україні, у якому здобувають освіту студенти з проблемами слуху, надана робота може бути віднесена до актуальних питань сьогодення.. Проведено збір та обробку інформації з навчання студентів з проблемами слуху з 2007 по 2018 роки. Спроектовано і розроблено базу даних РЦОІ. Проведено дослідження якості успішності студентів з проблемами слуху, які навчалися за спеціальністю «Комп’ютерні науки». Виконано аналіз пріоритетності дисциплін в їх освоєнні. Запропоновано об’єднання дисциплін за 6 категоріями. Доведено, що всі категорії дисциплін засвоюються, але дисципліни гуманітарної та соціальної спрямованості засвоюються легше. Підтверджено ефективність та доцільність отримання вищої освіти студентами з проблемами слуху
APPLICATION FOR CALCULATING THE PARAMETERS OF A GAS SENSOR FROM THE EXPERIMENTAL KINETIC DEPENDENCE OF RESPONSE
Authors: Tonkoshkur Alexander , Lozovsky Andrey
Published: April 2021

The elements of the structure and user interface of a specialized application for processing experimental data and calculating the parameters of gas sensors, based on the concept of using various software, packages and media are presented that are most effective at each stage. The application provides such service functions as data entry using Excel spreadsheet program; calculations in the mathematical package "Mathcad"; test item examples of using computational algorithms and providing the necessary textual information from internal sources and the Internet.
Investigation of transitional processes of vibration machine with inertionic vibrator and asynchronous motor
Authors: Kononov Dmytro , Yermokratiev Viktor , Miroshnyk Yevhen
Published: April 2021

Strict compliance with technological requirements in the production of steel is one of the main factors that determine the quality of products. In the mining industry, at metallurgical enterprises and transport hubs, all kinds of vibrating machines are widely used, and in particular vibrating conveyors (VTM): vibrating conveyors, vibrating conveyors and feeders, vibrating screens and screen feeders, and vibratory loaders. The main type of drive of such machines is an inertial drive, which consists of unbalanced vibrators. This drive is simple and has been widely used in vibrating machines of various types. To ensure stable operation (constancy of the oscillation amplitude when changing any system parameters) of such a vibrating machine with an inertial drive, a resonant setting is used. In this regard, there are difficulties that arise during start-up and run-out of the vibrating feeder: increasing the amplitude of oscillations, load on the foundation, power consumption, which leads to the fact that the motor does not reach rated speed and fails during start-up. Purpose: to study the dynamics of transients in VTM, which accompany the start of VTM from rest and run. The idea of the work is computer simulation of VTM dynamics based on numerical integration of a system of nonlinear differential equations describing the motion of a machine. As well as comparing them with experimental data. A mathematical model of VTM has been developed, differential equations of VTM motion have been compiled taking into account the characteristics of an induction motor. To solve the system of differential developed a program in the application Simulink. The obtained dependences confirm the increase in the amplitude of oscillation of the VTM tray when empty and stop VTM, which must be taken into account to calculate the parameters of the systems with vibrating machines. The experimental data are compared with the calculated ones, there is a good coincidence of results.
Jet grinding as a control object
Authors: Pryadko Nataliya , Bublikov Andrey , Ternova Katerina , Muzyka Lev
Published: April 2021

The relevance of the subject of this work is determined by the need to reduce the energy consumption of fine grinding by controlling the process, which is proposed to implement based on the results of acoustic monitoring. The paper describes the operation of a jet mill in a closed cycle. It is known that fine grinding refers to energy-intensive production, but jet grinding is indispensable in obtaining thin and ultra-thin "pure" materials, i.e. materials without the introduction of any impurities. And with the creation of a new way to control the process, there is a real opportunity to reduce energy consumption by jet mills while maintaining optimal performance. Based on the process parameter analysis input and output disturbing and control process parameters are selected. In this way, jet grinding is presented as a control object. The problems of jet grinding and ways to solve them are shown. This became the basis for further construction of automatic process control based on the acoustic signals of the grinding zone.
Modernization of laboratory rolling mill 150	for the formation of students 'studies of automation object research
Authors: Zinchenko Mykhailo , Potap Oleh , Rybalchenko Maria , Manachyn Ivan
Published: April 2021

Studying the operation of automated control systems using computers significantly re-duces the time, but does not give a complete picture of the system on a real object. Therefore, the use of real objects for the study of control systems in the educational process is appropriate and useful. The purpose of the study is to modernize the laboratory rolling mill 150, designed for rolling lead, tin and plasticine, and equip it with sensors and actuators. The manual pressure device of the rolling stand was replaced by an automated one, for which an worm gearbox was additionally installed, which allowed to increase the total gear ratio to 94.5. The thrust screws are moved from the AC motor, which is controlled by the DOP-103BQ operator panel and the MS-300 frequency converter with built-in PLC. As a displacement sensor used photopulse sensor PDF-3. The installed equipment and the developed software for the operator panel and the PLC provided high accuracy of in-stallation of pressure screws in the set position. Additionally, software was developed to measure the power parameters of the rolling process: the rolling force and the electrical parameters of the DC motor of the drive of the rolling stand. The software allows you to configure the board, ie select the type of board, the channels used to measure voltage signals, select measurement ranges, signal color on the graph, signal polling frequency, number of points to display on the graph, parameters of graph coordinate axes. In the process of measurement, the output of signals to the monitor screen is performed simultaneously. Before rolling, the measurement process is started using the keyboard or mouse and the change of parameters is displayed on the screen in real time. At the end of the rolling process, the measurement stops, and the graphs of parameter changes over time remain on the monitor screen, which allows you to quickly analyze the process. The measurement results can be saved in an Excel file and then the file can be viewed. The file stores: the time of measurement of parameters and the values of parameters those were measured. Measurement of power parameters and sizes of rolled products before and after rolling allowed to determine the stiffness of the stand and rolled metal, which is necessary to calculate the transmission coefficients of the automated tuning system of the rolling stand.