bluuebunny/crossref_metadata_2025 huggingface dataset:
Problematika Pembelajaran Tahfidz di Pondok Pesantren
Authors: Amir Syafruddin , Fauzi Muhammad Ridwan , Isomudin Muhammad
Published: August 2021

Tahfidz al-Qur’an merupakan suatu proses menjaga dan melestarikan kemurnian kitab suci al-Qur’an. Penelitian ini bertujuan untuk mengetahui problematika pembelajaran tahfidz al-Qur’an dengan memeberikan solusi dalam mengatasi masalah tersebut. Penelitian ini dilaksanakan di Pondok Pesantren Syamsul ‘Ulum dengan menggunakan pendekatan kualitatif dan metode deskriptif. Teknik pengumpulan datanya yaitu observasi, wawancara dan dokumentasi. Wawancara dilakukan kepada beberapa ustadz dan santri Pondok Pesantren Syamsul ‘Ulum. Kemudian data yang terkumpul, dianalisis dengan teknik analisis data kualiatatif. Dari hasil penelitian ini ditemukan bahwa: 1) Pembelajaran Tahfidz al-Qur’an merupakan salah satu program unggulan pondok pesantren Syamsul ‘Ulum yang menggunakan metode talaqqi dalam pelaksanaannya, 2) Problematika pembelajaran tahfidz al-Qur’an di pondok pesantren Syamsul ‘Ulum adalah rasa malas, kurang fokus, banyak kegiatan, faktor waktu, kurang pembimbing dan faktor lingkungan 3) Solusi untuk mengatasi problematika pembelajaran tahfidz adalah melawan malas dengan motivasi, memberi target hafalan yang jelas, mengurangi kegiatan ekstrakurikuler sekolah, dan memisahkan asrama
PROBABILITY MODELING AND THINKING: WHAT CAN WE LEARN FROM PRACTICE?
Authors: PFANNKUCH MAXINE , BUDGETT STEPHANIE , FEWSTER RACHEL , FITCH MARIE , PATTENWISE SIMEON , WILD CHRIS , ZIEDINS ILZE
Published: August 2021

Because new learning technologies are enabling students to build and explore probability models, we believe that there is a need to determine the big enduring ideas that underpin probabilistic thinking and modeling. By uncovering the elements of the thinking modes of expert users of probability models we aim to provide a base for the setting of new and more relevant goals for probability education in the 21st century. We interviewed seven practitioners, whose professional lives are centered on probability modeling over a diverse range of fields including the development of probability theory. A thematic analysis approach produced four frameworks: (1) probability modeling approaches; (2) probabilistic thinking approaches to a problem; (3) a probability modeling cycle; and (4) core building blocks for probabilistic thinking and modeling. The main finding was that seeing structure and applying structure were important aspects of probability modeling. The implications of our findings for probability education are discussed.
First published November 2016 at Statistics Education Research Journal Archives
DISCUSSION OF “PROBABILITY MODELING AND THINKING: WHAT CAN WE LEARN FROM PRACTICE?” BY PFANNKUCH ET AL.
Authors: PFANNKUCH MAXINE , CHANCE BETH , ROY SOMA , CORDANI LISBETH
Published: August 2021

First published November 2016 at Statistics Education Research Journal Archives
In the best of taste: contemporary food writing as literature
Authors: Brien Donna Lee
Published: August 2021

This article argues that Australian food writing can be assessed in literary terms. It profiles a number of prominent food writers who, alongside being popular and producing content of significance, are also admired for their quality of their writing. While a number of food writers have won acclaim specifically due to the literary quality of their writing, this is a relatively new way of assessing Australian food writing and examples of writers in the Australian context are profiled. This provides not only another way to read, understand and evaluate these food writing texts, but is also a means by which this popular, important and creative form of writing can be more closely integrated into the practice, teaching and research of non-fiction writing.
Dermal Fibroblasts from Chronic Wounds Exhibit Paradoxically Enhanced Proliferative and Migratory Activities that May be Related to the Non-Canonical Wnt Signaling Pathway
Authors:   Boston University School of Medicine, Department of Dermatology, Boston, MA, Vinas Marta , Lin Xiaofeng ,   Boston University School of Medicine, Department of Dermatology, Boston, MA, MacLauchlan Susan ,   Boston University School of Medicine, Molecular Cardiology/Whitaker Cardiovascular  Institute, Boston, MA, Carson Polly ,   Boston University School of Medicine, Department of Dermatology, Boston, MA, Falanga Vincent ,   Boston University School of Medicine, Department of Dermatology, Boston, MA
Published: August 2021

It is generally thought that dermal fibroblasts from chronic wounds are in a state of senescence, which contributes to the failure to heal. This assumption, based on limited experimental evidence, has led to the widespread use of therapeutic approaches focused on delivering new fibroblasts and/or increasing resident fibroblast activity to promote healing. In this study, we decided to re-visit the evidence for the relative inactivity of resident chronic wound fibroblasts. We therefore evaluated the proliferative and migratory activities of matching, patient-derived dermal fibroblasts from a chronic wound (wound dermal fibroblasts, or WDF), ipsilateral thigh newly created acute wound dermal fibroblasts (ADF, Day-3 after wounding the normal thigh skin), and ipsilateral thigh normal dermal skin fibroblasts (NDF). This approach was used in each of 10 consecutive non-selected individual patients with a venous leg ulcer, and allowed us to determine whether WDF are intrinsically less active than NDF and AWD. Cell migration and proliferation were quantified by a live-cell analysis system and MTT assay, respectively, in low (0.5%) or high (10%) levels of fetal bovine serum (FBS). In addition, the ability of patient-derived fibroblasts to modulate wound re-epithelialization in vivo was analyzed by transplantation in a mouse tail full-thickness wound model. Wnt5a mRNA, its ROR1 co-receptors, and ROR2 mRNA levels were determined by qRT-PCR. We report that WDF had increased -SMA and increased levels of Wnt5a. Moreover, using live-cell imaging in a scratch assay monolayer model, WDF showed baseline migratory activity similar to those of NDF and ADF, and such activity was not stimulated by FBS. WDF showed the same capacity to increase wound re-epithelialization as NDF and ADF. Together, these results suggest that WDF are not actually less "active" than NDF and ADF. This enhanced activity of chronic wound fibroblasts may lead to high energy requirements that contribute to a failure to heal. The findings may represent a new paradigm for wound chronicity, impaired healing, and high recurrence rates.
Effect of Topical Oxygen Therapy on Chronic Wounds
Authors:   Mount Sinai West/Morningside  New York, NY, James Crystal , Park So ,   Mount Sinai West/Morningside New York, NY, Alabi Denise ,   Mount Sinai Health System New York, NY, Lantis John ,   ivision Chief of Vascular and Endovascular Surgery Mount Sinai West/Morningside New York, NY
Published: August 2021

Over the past three decades, there has been a growing interest in the use of oxygen therapy to promote wound healing. Although the most commonly recognized oxygen therapy for the treatment of chronic wounds is hyperbaric oxygen therapy, topical oxygen therapy has a greater level of evidence supporting its use in chronic wound care. Still, it is imperative that these two treatment modalities be recognized not merely as competitors, but as distinct therapeutic entities. Through personal experience and a thorough literature review, we investigated the use of topical oxygen therapy in the management of chronic wounds. The benefits of using topical oxygen therapy have been demonstrated in patients with diabetic foot ulcers, ischemic ulcers, post-revascularization ulcers, and pressure ulcers. There are several topical oxygen devices currently on the market that are versatile, relatively low-risk, and generally well-tolerated by patients. While these devices have been used in the treatment of chronic wounds at different locations and of different etiologies, other uses of these devices are still being investigated. Topical oxygen therapy is yet another tool in our arsenal to be used in treating difficult to heal chronic wounds and could potentially be used more readily.
Gastric Duplication Cyst: A Rare Case Report
Authors: Avcı Veli , Çelik Ramazan , Özgökçe Mesur
Published: August 2021

Duplication cysts are developmental anomalies of gastrointestinal tract that can occur at any level from the oral cavity to the rectum, and are extremely rare in the stomach. Most patients show symptom and findings in the first year of life. The most common symptom and findings are abdominal pain, nausea, vomiting, anemia, weight loss and palpable mass. In this study, a gastric duplication cyst was presented in an 11-month-old patient.
Perancangan aplikasi e-persuratan berbasis web menggunakan framework codeigniter pada direktorat lalu lintas dan angkutan laut kementerian perhubungan
Authors: Mulyani Gina , Zulhalim Zulhalim , Yasin Verdi
Published: August 2021

Designing a Web-based e-correspondence application using the CodeIgniter framework at the Directorate of Traffic and Sea Transportation is very much needed because the administrative process for managing correspondence is still using office applications. Moreover, since the Covid-19 pandemic occurred, which resulted in the division of the implementation of official duties at the office (WFO) and official duties at home (WFH), which required the letter disposition process that was previously carried out through the WhatsApp group to be less effective and efficient. Moreover, a large number of lost letter files and limited access resulted in the process of posting letters being hampered, which affected the performance of the Directorate of Traffic and Sea Transportation. By conducting and descriptive qualitative research, namely research that takes existing problems by describing the object that is the subject of the problem by collecting, compiling, analyzing, interpreting it in the form of a report. Data collection techniques using interview techniques, data observation, document analysis, and concluding. It is hoped that this application can simplify the process of recording, disposing of, numbering, and storing letters at the Directorate of Traffic and Sea Transportation.
Platform Berbasis Web untuk Usaha Kecil Menengah
Authors: Wulantika Linna , Melfiani Novita , Ratuningrat Siti Yolanda Rosalinda , Anisa Febilia , Mega Raiswati Untsa
Published: August 2021

Penelitian ini bertujuan untuk membuat website untuk memperkenalkan produk mulai dari varian, keunggulan, dan lain-lain tentang produk tersebut melalui website. Penelitian ini menggunakan metode penelitian deskriptif kualitatif, penelitian kualitatif berdasarkan data dan prinsip analisis hubungan sosial, mendeskripsikan fakta atau pengalaman. Jenis penelitian yang digunakan adalah penelitian deskriptif dengan pendekatan studi kasus. Penelitian ini difokuskan untuk menganalisis website dan strategi komunikasi produk tersebut dengan melihat kekuatan dan kelemahan pemasaran melalui website dan menganalisis sistem komunikasi pemasaran yang dilakukan oleh penjual untuk mendukung strategi pemasaran toko. Penelitian ini bertujuan untuk mengetahui kekuatan dan kelemahan pemasaran melalui website dan menganalisis sistem komunikasi pemasaran yang dilakukan oleh penjual untuk mendukung strategi pemasaran. Hasil penelitian menunjukkan bahwa Kios (Toko Online) berbentuk website merupakan salah satu media penjual untuk memasarkan produknya guna meningkatkan hasil dan kualitas penjualan.
Perkembangan e-commerce untuk usaha kecil
Authors: Suhayati Eli , Renali Silvia , Suherman Salsa Viowika , Matulessy Ivana Fiona , Saputra Herry
Published: August 2021

Tujuan dari penelitian ini adalah untuk mengetahui penggunaan e-commerce untuk usaha kecil. E-commerce merupakan salah satu inovasi dunia bisnis yang dapat memudahkan penjual dan pembeli dalam melakukan transaksi bisnis khususnya jual beli. Penelitian ini menggunakan metode penelitian deskriptif kualitatif dengan menyebarkan kuesioner. Hasilnya menunjukkan bahwa e-commerce berpengaruh dan membantu mengembangkan usaha kecil. Seiring dengan perkembangan sistem elektronik berbasis internet yang semakin canggih, pengguna e-commerce pun akan semakin meningkat. Namun, menggunakan e-commerce memiliki kekurangan dan kelebihan. E-commerce hadir untuk memberikan kemudahan dalam berbisnis di dunia maya bagi para pemilik usaha, termasuk pemilik usaha kecil. Hasil penelitian ini menyimpulkan bahwa sebagian besar pelaku usaha kecil telah terbantu dengan melakukan penjualan melalui e-commerce. Oleh karena itu, e-commerce merupakan layanan yang dapat membantu perkembangan suatu bisnis.
Membangun sistem informasi pendaftaran siswa baru di SMA Pelita Bangsa Muara Gembong secara online
Authors: Immasari Ito Riris , Alfiah Istinur
Published: August 2021

The existence of a system that is applied online can help and facilitate human work in various aspects of life so that it is easier and more effective. The implementation of the registration of prospective new students is used as the initial process of entering a new level in education. The implementation of the registration of prospective new students who have to come directly to the school to fill out the registration form is considered ineffective and inefficient. So, to make the registration process easier, it is necessary to create an online registration information system. For the analysis stage using flowcharts, activity diagrams, use case diagrams, Erd, and hierarchies for the design stage using class diagrams. With the design of a web-based system, it can simplify the process of registering new members, storing data relating to new student registrations can be stored neatly using a database and information relating to new student registration can be obtained quickly and accurately.
A Questionnaire Based Study on Knowledge of Body Donation among Undergraduate Students
Authors: Jakka Lakshmi Durga , Pitta Venkata Chandrika , D Asha Latha
Published: August 2021

Aim & Objective: Anatomy set forth the fundamentals of human body in the course of all health care professionals. Cadaveric dissection is the principal way to understand the Human anatomy by the medical students. Donated bodies fulfill the need of cadavers in learning and teaching anatomy. Apart from the use of cadavers students must be aware of particulars regarding body donation. The aim of present study is to assess the knowledge of medical students on body donation.
Methods: The research work is questionnaire based study carried out among 263 undergraduate medical students in Siddhartha medical college, Vijayawada. Structured questionnaire was prepared and distributed among the students. The data was collected, compiled and analyzed.
Results: All the study members knew the term body donation. Majority of the students are unaware of the time limit to donate the body and the age limit of body donation. 57.03% knew who can donate body. 89.7% knew that the death certificate is mandatory during body donation process. 60.45% had clear idea of reasons for body rejection when donated. 96.57 % had clear idea about the uses of donated body. 59.31% of the students were willing to donate their body and 93.53% were interested in propagating the message of body donation.
Conclusion: Our study suggests that the medical students should be aware of act, process and committee of body donation before they involve in the propagation about body donation among public.

Keywords: Awareness, anatomy act, body donation, donation forms.
Assessment on the Effect of Active Management of Third Stage of Labour With and Without Uterine Massage on Maternal Outcome among Postnatal Mothers
Authors: Kundu Aparajita , Jana Manasi
Published: August 2021

The most common cause of maternal death worldwide is postpartum hemorrhage (PPH) and Active Management of Third Stage of Labour (AMTSL) is the most important prophylactic intervention for prevention of PPH. A study was undertaken to assess the effect of AMTSL with and without uterine massage on maternal outcome among postnatal mothers in a selected hospital, WB. In this quasi-experimental study, Total 60 (Experimental Group-30, Control Group-30) postnatal mothers who undergone spontaneous vaginal delivery were selected by non-probability purposive sampling technique followed by randomization. The uterine massage is applied for 1 min immediately after placental delivery to 2 hours of postpartum at every 15 mins interval. The results revealed that there was no statistically significant difference of mean amount of postpartum bleeding between experimental and control group at 1st hour, 2nd hour, 24 hours, and 48 hours [t1= 1.06, t2= 1.52, t3=0.47, t4=0.26 at df (58), p>0.05]. The general condition (BP, Pulse, Respiration) after 1st hour, 2nd hour, 24 hours and 48 hours were comparable and statistically not significant between the two groups. There was no significant association between amount of postpartum bleeding and obstetrical parameters like parity, gravida, POG, presence of episiotomy, birth weight, time of placental delivery, presence of tear and time of initiation of breast feeding etc. for both groups. Based on the results of the current study, it can be concluded that the mothers who received the uterine massage along with AMTSL get no additional benefit as compared to control group.

Keywords: Active management of third stage of labour (AMTSL); Uterine massage; Maternal outcome; Postnatal mother.
The Effect of Profitability, Asset Structure, Company Size on Stock Returns with Corporate Governance as Moderating Variables in Manufacturing Companies on the IDX in 2009-2018
Authors: Lasmarito Siahaan Deby Yurika , Bukit Rina Br , . Tarmizi
Published: August 2021

The research objective was to examine and analyze whether Profitability, Asset Structure, Firm Size simultaneously and partially influenced Stock Returns in Manufacturing Companies. In addition, this study also tries to prove whether Corporate Governance can be used as a moderator in the research model. The research results showed that simultaneously Profitability, Asset Structure, Firm Size significantly influenced Stock Returns. Partially, profitability has a positive and significant influence on Stock Returns. Asset Structure has a positive and significant influence on Stock Returns, and Company size has a positive and insignificant influence on Stock Returns. The variable of Corporate Governance can moderate the influence of Asset Structure on Stock Returns. However, Corporate Governance will not be able to moderate the influence of Profitability on Stock Returns.

Keywords: Profitability, Asset Structure, Firm Size, Stock Return, and Corporate Governance.
Peningkatan dan Pemerataan Pendidikan Melalui E-Learning
Authors: Muhammad Nasrulloh Mubarak  , Jesica Febriani Nura
Published: August 2021

Pandemi COVID-19 menempatkan seluruh dunia pada umumnya dan Indonesia secara khusus pada situasi kritis. Pandemi COVID-19 mempengaruhi sistem pendidikan yang awalnya adalah tatap muka menjadi daring. Maka dari itu, pengetahuan tentang trend inovasi teknologi digital dalam dunia pendidikan adalah penting sehingga dapat memilih teknologi yang tepat untuk diimplementasikan secara riil. Karya tulis ini menyajikan rangkuman trend teknologi yang telah diimplementasikan di dunia pendidikan. Metode pengumpulan data dilakukan melalui tahapan studi literatur di internet menggunakan search engine ScienceDirect dan Google Scholar dengan kata kunci kualitas pendidikan, teknologi, e-learning. Hasil pencarian menunjukkan bahwa inovasi trend teknologi pendidikan berbasis digital seperti e-learning maupun blended learning berada di posisi teratas sebagai teknologi yang dianggap menyumbang pengaruh terpositif dalam keberlangsungan pendidikan di tengah pandemi COVID-19. Beberapa contoh platform media penunjang e-learning yang banyak digunakan adalah Kahoot!, Edmodo, Prototype, Macromedia Flash Player, Lectora Inspire, Moddle, dan Adobe Dreamweaver CS6. Pada umumnya, tiap-tiap platform e-learning mampu untuk menyajikan bahan ajar interaktif, berbagi bahan ajar ke sesama pengguna serta dapat diakses kapan pun dan di mana pun. Di antara semuanya, Kahoot! menjadi teknologi penunjang yang paling diminati. Kahoot! Adalah alat evaluasi yang dapat diakses melalui penjelajah web atau aplikasi Kahoot. Teknologi penunjang dengan sisipan games dan tampilan warna-warni ini dapat meningkatkan antusiasme peserta didik sehingga kelas lebih aktif dan seru. Karena itu, platform Kahoot! sangat cocok dipadukan dengan teknologi pembelajaran saat ini, khususnya e-learning. Melalui perangkuman data literatur trend teknologi digital berikut, diharapkan gambaran pemetaan teknologi yang menunjang dan cocok diterapkan pada jenjang perguruan tinggi Indonesia dapat dimengerti. Sehingga kontinuitas pelaksanaan praktik pendidikan Indonesia dapat konsisten dan selalu memberi prestasi hingga skala global.
Un poet cathartic și oracular: Nicolae Dabija
Authors: Copcea Florian
Published: August 2021

Nicolae Dabija, an assiduous promoter of the generation of poets also called the third eye (literary criticism attributes this phrase to him after the title of his debut volume – The Third Eye, Chisinau, 1975), is considered a living and mythical iconographer who, as no one else, in our immediate contemporaneity, sang the drama of the suffering of Bessarabia. He wrote a poem of „hymn, elegiac or monodic, programmatic messianic” nature, as the academician Mihai Cimpoi observes. His poetry, due to its certain value, always under the sign of sacrificial authorial identification, was favorably received, awarded and translated in many countries. Nicolae Dabija’s poems, unmistakable and memorial, do not belong only to the Romanian language on the left bank of the Prut, but to all those who are dominated by the boundlessness of the Romanian spirit.
School bus routing problem considering affinity among children
Authors: Cabrera Juan Pablo Orejuela , Londoño Milton Alexander , Pantoja Vivian Lorena Chud
Published: August 2021

School bus routing problem is widely studied, however, social elements such as the interaction between children traveling on the same route have not been considered so far. In this way, this article has as its main objective to propose a methodology to solve the school bus routing problem, including affinity as a strategy to increase positive interrelationships between children, and with this, support in bullying situations during school trips. The methodology includes two stages, assigning children to vehicles considering affinities and defining vehicle routes. The main contribution is the consideration of affinity in the process of forming the groups of children that will be taken on the bus, evidencing a balance in the affinity of the groups. Additionally, from the methodological point of view, the integration of a modified group technology algorithm and a new assignment model are proposed that simplify the classic quadratic assignment problem. Consideration of affinity in school bus routing generates benefits from a social point of view.
Medicinal properties of Muntingia calabura L.: A Review
Authors: Muhammad Ansori Arif Nur , Kharisma Viol Dhea , Intan Solikhah Tridiganita
Published: August 2021

Indonesia has abundant medicinal plants, which have been historically used by the population in treating diseases for generations. Traditional Indonesian medicine and the medicinal plants used could lead to the discovery of novel drugs. For example, Muntingia calabura L., also known as kersen, is a well-known medicinal plant that has been used to treat various diseases worldwide. The pharmacological activities and phytochemical composition of the whole plant of M. calabura L. have been investigated and identified by scientists in recent decades. These studies have established the therapeutic potential of kersen for drug discovery. This present review provides an overview of the ethnopharmacology, pharmacology, and phytochemistry of M. calabura L. as they relate to its use against severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2).
土地法裁判精選──市地重劃之公共設施用地負擔
Authors: 陳立夫 陳立夫
Published: August 2021

本期土地法裁判精選，以市地重劃之公共設施用地負擔為主題，擷錄臺北高等行政法院105年度訴字第1849號判決及高雄高等行政法院109年度訴字第233號判決與主題關連部分，予以綜合簡析。
Técnica para Rastreamento de Ressonância em Conversor CLLLC
Authors: STAATS ARTHUR DE JESUS , PINHEIRO HUMBERTO
Published: August 2021

A topologia CLLLC apresenta estrutura simétrica, sendo uma excelente opção de conversor DC-DC isolado para aplicações bidirecionais, garantindo comutação suave no primário e secundário, elevada eficiência e operação análoga para ambos os sentidos do fluxo de potência. É proposto um sistema de acionamento baseado no rastreio da ressonância para o conversor CLLLC, uma vez que a operação neste ponto garante a máxima eficiência da topologia. Desta forma, o conversor opera com ganho unitário da tensão de entrada para saída. A técnica de rastreamento da ressonância baseia-se na amostragem da corrente secundária do circuito ressonante no instante de comutação dos semicondutores. O que simplifica a implementação em processadores digitais de sinais para frequências de chaveamento elevadas.
Análise dos Impactos do Atraso de Implementação em Controladores de Corrente com Amortecimento Ativo para Conversores Conectados à Rede
Authors: ARAUJO MARCELO BACK DE , VIEIRA RODRIGO PADILHA
Published: August 2021

Esse trabalho apresenta análises sobre o efeito causado pelo atraso de implementação no amortecimento ativo de inversores conectados à rede com filtro LCL. Através do desenvolvimento matemático, é constatado que a realimentação da corrente do capacitor do filtro apresenta menor amortecimento quando há atraso de implementação no sistema, com isso, um elevado ganho do amortecimento ativo pode levar o sistema à instabilidade. Com intuito de validar a teoria desenvolvida, múltiplos compensadores ressonantes são utilizados para controlar o sistema e resultados de simulações são demonstrados.
Análise da Tensão de Restabelecimento Transitória em Disjuntor de Alta Tensão: Estudo de Caso em uma Instalação Elétrica Industrial
Authors: OLIVEIRA CEZAR AUGUSTO DA SILVA , MORAIS ADRIANO PERES DE , SARTORI ÂNGELO FELIPE , GUARDA FERNANDO GUILHERME KAEHLER , JUNIOR GHENDY CARDOSO , FREITAS-GUTIERRES LUIZ FERNANDO
Published: August 2021

Os padrões IEEE Std C37.011-2011 (2011) e IEEE Std C37.04b-2008 (2008) são guias técnicos para a análise e a especificação de disjuntores, estabelecendo capacidades máximas para evitar a superação frente a Tensões de Restabelecimento Transitórias (TRT). Este estudo tem como objetivo avaliar o desempenho com foco na TRT de um disjuntor isolado a gás SF6 de uma subestação de 69 kV localizada em uma instalação elétrica industrial. Este trabalho é baseado nos limites operacionais estabelecidos pelas normas IEEE Std C37.011-2011 e IEEE Std C37.04b-2008 para investigar o comportamento da TRT durante curto-circuito. As simulações foram executadas através do EMTP-ATP e do seu pré-processador gráfico ATPDraw. Os resultados mostram a necessidade de se realizar uma análise de TRT detalhada durante o desenvolvimento do projeto, de forma a garantir o dimensionamento adequado do disjuntor.
Análise do Conversor Totem Pole para Correção do Fator de Potência utilizando Semicondutores de Nitreto de Gálio (GaN)
Authors: BACH LEONARDO CASSOL , RECH CASSIANO , BATSCHAUER ALESSANDRO LUIZ
Published: August 2021

Neste artigo é apresentada a análise do conversor Totem Pole para correção do fator de potência, sendo mostradas as etapas de operação, modelagem e controle. Também são discutidas as vantagens do seu uso com semicondutores de potência de Nitreto de Gálio (Gallium Nitride - GaN) e diferenças em relação ao conversor Boost PFC. De modo a validar as análises, são mostradas simulações para uma aplicação de 360W.
Modelagem e Controle de um Conversor Boost com Célula de Ganho Aplicado ao Rastreamento do Ponto de Máxima Potência
Authors: BEZERRA MARCELO LOPES VIEIRA , MATIAS RAFAEL ROCHA
Published: August 2021

Este artigo propõe a modelagem e controle de um conversor boost de alto ganho de 320 W no modo de condução contínua operando como estágio CC de um microinversor de dois estágios. A modelagem foi realizada via técnica do Valor Médio Quase Instantâneo - VMQI considerando o ponto quiescente o ponto de máxima potência. Para obter uma tensão de referência que fornece a tensão no ponto de máxima potência, foi utilizado o algotimo MPPT Pertuba e Observa e o controle foi realizado via um proporcional integral (PI) para garantir erro nulo em regime permanente. Ao final obteve-se um rastreamento de 99,5% da potência fornecida pelo módulo.
Estratégia MTPA para a Máquina IPMSM de Baixo Custo Computacional Baseada em Polinômios de Lagrange
Authors: SILVA EDUARDO CATTANI , ROCHA LUCAS ROSSATO , VIEIRA RODRIGO PADILHA
Published: August 2021

Esse trabalho apresenta uma abordagem para implementação do algoritmo MTPA para micro-controladores de baixo custo e desempenho, visando aplicação industrial. Devido à complexidade matemática do MTPA, muitos algoritmos propostos demandam alto desempenho computacional, impossibilitando a implementação em microcontroladores com reduzida capacidade. Nesse trabalho serão utilizados métodos numéricos afim de reduzir o custo computacional e obter aproximações com elevada precisão. Afim de validar os resultados, serão realizadas simulações em hardware e em software.
Design and Analysis of a Multi-Port DC Microgrid to Power Flow Control in a Robotic System
Authors: COELHO VINíCIUS DE OLIVEIRA , BALBINO ANDERSON JOSé , SILVA LUCAS RAPHAEL DE JESUS DA , ARTMANN VINíCIUS NOAL , SIMAS HENRIQUE , MARTINS DANIEL , BATISTA GUILHERME , KINCELER ROBERTO
Published: August 2021

This paper focuses on analyzing and designing the control system in a DC microgrid, which is responsible to provide energy for a robotic system built to inspect distribution power lines. The microgrid was projected to feed sensors, microcontrollers, and a DC motor. Also, in order to provide energy for the system, lithium-ion batteries and photovoltaic cells are employed as sources of the microgrid. With this architecture, the control system is designed to adjust the current/voltage references, to ensure the power balance in the DC microgrid. To corroborate the proposed structure, simulation results are presented under different scenarios of irradiance, temperature, load steps, and torque oscillations in the DC motor.
Dynamic Analysis for VSG-Based Power Flow Control Applied to DG Systems
Authors: NASCIMENTO THIAGO FIGUEIREDO DO , SALAZAR ANDRES ORTIZ
Published: August 2021

The integration of distributed generation (DG) systems based on renewable energy sources (RES) by using power converters is an emerging technology in modern power systems. Among the control strategies applied to this new configuration, the virtual synchronous generator (VSG) approach has proven to be an attractive solution due providing suitable dynamic performance. Thus, this paper presents a dynamic analysis of gridtied converters controlled by using VSG concept. This analysis is based on a dynamic model that describes the DG power flow transient characteristics. Based on this model, the grid impedance parameters variation effects on the VSG controllers dynamic performance are discussed. Simulation results are presented to evaluate the effectiveness of the theoretical analysis performed.
Análise, Modelagem e Controle de Potência para Sistemas de Energia Eólica Tipo IV
Authors: PAULA JOãO FREDERICO SOUZA DE , MOURA ADRIANO ARON PEREIRADE , ROCHA EDNARDO PEREIRA DA , GURGEL NATHAN BEZERRA , MARTINS BRUNO FERNANDES , MOURA AILSON FREITAS DE
Published: August 2021

No presente trabalho foram realizadas simulações no software ATPDraw de uma turbina eólica do tipo IV, cuja arquitetura consiste em um retificador trifásico não controlado, um conversor boost e um inversor trifásico controlado nos eixos direto e quadratura; e com chaveamento a PWM. Controlador PI foi utilizado para minimizar o erro e controlar a potência ativa e potência reativa de maneira independente, permitindo injeção de potência na rede. Os resultados apresentados são satisfatórios e indicam a redução do erro nos controladores PI e o efetivo controle das potências injetadas na rede elétrica.
Análise de Viabilidade Econômica na Implantação de Termoelétrica a Base de Casca de Arroz em Cachoeira Do Sul - RS
Authors: NOGUEIRA LUCAS ALVAREZ , RAMOS MAICON JADERSON SILVEIRA , SANTOS LAURA LISIANE CALLAI DOS
Published: August 2021

The industrial process and production of rice requires a correct management of the residues generated by them, for the best use of them, proper disposal, and reduction of environmental impacts. In this context, when perceiving the potential of rice production in the city of Cachoeira do Sul - RS, the present project proposes the economic viability analysis in the implantation of a thermoelectric power plant with the generation of energy from the rice husk biomass in the municipality of Cachoeira do Sul. For the present work, a survey of rice production in the main mills of the city was prepared and the amount of rice husk that could be used as fuel in the biomass-based thermoelectric plant was defined. The costs necessary for the implementation of the thermoelectric plant and the revenues from the sale of the produced energy were evaluated, making it possible to obtain economic viability analysis of the project. The values found in the minimum attractiveness rate, net present value, internal rate of return and payback calculations show that the use of rice husk for power generation in a thermoelectric plant is viable for Cachoeira do Sul-RS.
Um Procedimento de Projeto de Controladores PID para Conversores CC-CC com Validação em Hardware-in-the-Loop
Authors: MATTOS EVERSON , MEDKE RENAN , VIARO ROBERT UILIAM MARIN , BORIN LUCAS CIELO , OSóRIO CAIO RUVIARO DANTAS , KOCH GUSTAVO GUILHERME , MONTAGNER VINíCIUS FOLETTO
Published: August 2021

Este artigo apresenta um procedimento de projeto de controladores do tipo proporcional-integral-derivativo (PID) aplicados a conversores CC-CC, com validação experimental em hardware-in-the-loop. Primeiramente, o conversor é modelado considerando variações paramétricas. Após, os ganhos do PID são projetados com base na otimização do desempenho para uma situação nominal. Então, o desempenho do sistema com o controlador é verificado por meio de simulações no domínio da frequência e no domínio do tempo considerando operação para uma faixa de valores para a resistência carga e para a tensão de entrada. Finalmente, resultados em tempo real do controle implementado em processador digital de sinais são mostrados, para validar o projeto. O procedimento é ilustrado no artigo para um estudo de caso para um conversor buck.
Proposta de um Novo Agente Institucional de Armazenamento de Energia
Authors: GOULART DIEGO DORNELES , SPERANDIO MAURICIO
Published: August 2021

Este trabalho objetiva apresentar uma proposta metodológica para realizar uma análise econômico-regulatória da inserção de um novo agente institucional no setor elétrico brasileiro (SEB), o agente de armazenamento de energia. Com novos paradigmas tecnológicos e arranjos econômico-regulatório futuros com sistemas de armazenamento de energia (SAEs) no SEB, os agentes de geração, transmissão e distribuição de energia elétrica serão modelados para as simulações de modelagem baseada em agentes (ABM), com variáveis técnico-operacionais e econômico-regulatórias, em: a) cenário futuro 1, com gestão individualizada sobre os resultados com SAEs segmentados; b) cenário futuro 2, com a inserção de um novo agente de armazenamento de energia elétrica para a prestação de serviços com SAEs, com gestão centralizada, em nova relação contratual com os demais agentes do SEB.
Estudo de Sistemas Fotovoltaicos Conectados à Rede Elétrica Instalados em Goioerê - PR Através de Índices de Mérito
Authors: CREMASCO NICOLE POLITYTO , CORDEIRO ANA CARLA , JUNIOR JAIR URBANETZ , YANG RENATA LAUTERT , HILGERT DIEGO PLAZZA , LELUDAK JORGE ASSADE
Published: August 2021

Analisaram-se quatro sistemas fotovoltaicos instalados no estado do Paraná na cidade de Goioerê. Ao final do trabalho, os dados do Atlas de Energia Solar do Estado do Paraná e da estação do INMET, utilizados para o cálculo da taxa de desempenho foram comparados chegando à conclusão que há diferença entre eles. Como resultado, o sistema 2 apresentou maiores valores de média anual de produtividade, fator de capacidade e de taxa de desempenho, tanto no caso em que os valores de irradiação utilizados eram provenientes do Atlas, quanto no caso em que eram do INMET. Além disto, na análise comparativa entre a taxa de desempenho obtida através de dados de irradiação do Atlas e do INMET, todos os sistemas obtiveram maiores valores com a utilização de dados de irradiação do Atlas. As análises possibilitaram a avaliação do comportamento dos sistemas em Goioerê, comprovando o elevado potencial do local para instalações de sistemas fotovoltaicas.
Modelagem e Controle de um Inversor Diferencial Buck-Boost com Técnica de Linearização de Ganho Estático para Redução de Distorção Harmônica
Authors: SANTOS ION LEANDRO DOS , BALBINO ANDERSON JOSé , ANDRADE JéSSIKA MELO DE , LAZZARIN TELLES BRUNELLI
Published: August 2021

Este trabalho contribui no estudo do inversor diferencial Buck-Boost com técnica de linearização de ganho estático. O modelo dinâmico é desenvolvido e validado via comparação da reposta ao degrau e da resposta em frequência do modelo comutado e do modelo de pequenos sinais. O uso da linearização e da modelagem permitem a redução da distorção harmônica da tensão de saída do inversor, projeto do controlador através de técnicas clássicas e aplicação de um controlador proporcional ressonante para seguimento de referência. As especificações utilizadas são: potência de 250 W, tensão de entrada de 100 V e tensão eficaz de saída de 110 V. Por fim, são apresentados os resultados de simulação com o intuito de validar o estudo e verificar a qualidade da tensão de saída. Ao comparar a distorção harmônica da tensão de saída com e sem técnica de linearização, tem-se uma redução de 5,96% para 0,274%.
Métricas para a Avaliação do Impacto da Geração Distribuída Fotovoltaica na Curva de Carga
Authors: PAIXãO JOELSON LOPES DA , ABAIDE ALZENIRA DA ROSA
Published: August 2021

A integração de fontes alternativas de energia aos tradicionais sistemas elétricos é uma realidade no mundo inteiro, graças a características, como: ausência de partes móveis, possibilidade de instalação em telhados, boa disponibilidade de irradiação solar entre os trópicos, redução de custos e maturidade das tecnologias empregadas, a fonte fotovoltaica ganhou espaços tanto em grandes fazendas como na geração distribuída. O sistema de geração distribuída fotovoltaica (GDFV) altera a curva de carga da unidade consumidora e, dependendo da quantidade de sistemas, do alimentador. Portanto, nesse artigo propõe-se métricas para avaliar como a presença de unidades de GDFV é capaz de modificar a curva de carga. Para estudo é utilizado um alimentador tipicamente residencial e a curva de carga é avaliada sob nove métricas propostas. Os resultados mostram que a GDFV reduz o consumo durante o dia e aumenta a necessidade de energia despachável quando cessa a geração fotovoltaica.
Análise do Aumento de Consumidores do Grupo A4 com Geração Distribuída Fotovoltaica no Sistema de Distribuição
Authors: MACEDO LEANDRO DE MELO , SEVERO TIAGO CASSOL , OLIVEIRA DANUSIA DE LIMA DE , BERNARDES ANDRé MICHEL
Published: August 2021

Nos últimos anos fatores econômicos, ambientais e tecnológicos têm impulsionado a pesquisa em soluções energéticas que possam trazer mais eficiência, sustentabilidade e qualidade ao sistema elétrico. Assim, a geração distribuída fotovoltaica tem se mostrado uma alternativa ao mercado energético, já que estudos apontam que problemas causados pelas grandes distâncias das fontes geradoras às suas cargas e picos de demanda podem ser atenuados a partir desta tecnologia. Entretanto, parâmetros de qualidade de energia, como a tensão em regime permanente, precisam manter padrões considerados adequados pelos órgãos reguladores, mesmo com a introdução de sistemas fotovoltaicos, sem afetar o sistema de distribuição de baixa ou de média tensão. Em vista disso, este trabalho apresenta o comportamento da tensão ao longo do tempo de um sistema de distribuição operando em 13,8 kV, valor característico do grupo de consumidores A4 do estado do Rio Grande do Sul, a partir de cenários com diferentes números de conexão de sistemas de geração.
Inversor Fotovoltaico de Fases Reconfiguráveis
Authors: SCHARDONG CHARLES , SACCOL GABRIEL AVILA , MICHELS LEANDRO , BELLINASO LUCAS VIZZOTTO , RECH CASSIANO , MEIER MARTIN BREUS , SANTOS WALTER MENEGHETTE DOS
Published: August 2021

No Brasil, o sistema de distribuição em baixa tensão apresenta diversos níveis de tensão e modos de conexão diferentes, que variam de acordo com a região e a distribuidora de energia elétrica. Com base nisso, o artigo apresenta o desenvolvimento de um inversor de estrutura reconfigurável. O inversor possui um algoritmo de detecção de configuração, que possibilita identificar qual tipo de rede está conectada, permitindo que suas estratégias de controle sejam selecionadas de acordo com a rede disponível. Assim, o inversor pode operar na diversidade de níveis de tensão e configuração de fases existentes no Brasil. Resultados experimentais do firmware em Hardware-In-the-Loop (HIL) são mostrados para diferentes configurações de rede.
Análise e Projeto do Conversor Dual Active Bridge - Multinível Aplicado em Sistemas de Armazenamento de Energia
Authors: COSTA PAULO ROBSON MELO , AZZOLIN GUSTAVO STIVANIN , SANTOS WALTER MENEGHETTE DOS , MEIER MARTIN BREUS , BELLINASO LUCAS VIZZOTTO , RECH CASSIANO , MICHELS LEANDRO
Published: August 2021

Esse artigo analisa o conversor multinível bidirecional DAB-NPC, formado por duas pontes inversoras interligadas por um transformador de alta frequência. A topologia de 5 níveis com ponto de neutro grampeado a diodo foi utilizada na ponte de alta tensão, permitindo que as chaves semicondutoras operem com tensão reduzida. A modulação é realizada através de distâncias angulares, permitindo o equilíbrio das tensões dos capacitores do barramento CC. O controle de potência é realizado através do ângulo de defasagem entre as tensões em cada lado do transformador. Propôs-se a implementação de um filtro LC no lado de baixa tensão para diminuir a oscilação de corrente na bateria. A adição deste filtro torna a operação mais instável e dificulta o projeto de controladores convencionais. Por isso, a potência no conversor foi controlada por meio do controlador LQR. Os resultados obtidos por simulação validaram as estratégias de controle e de projeto adotadas neste trabalho.
Análise Dielétrica e Metodologia de Amostragem para Ensaios Dielétricos em Transformadores de Potência
Authors: BUENO DANIELA MAIA , MEDEIROS LEONARDO HAUTRIVE , QUINTILIANO MATHEUS STEFANELLO , JUNIOR ANTôNIO MARIO KAMINSKI , NOGUEIRA GABRIEL CIPOLATTO , BELTRAME RAFAEL CONCATTO , BENDER VITOR CRISTIANO , MARCHESAN TIAGO BANDEIRA
Published: August 2021

Este artigo apresenta a análise dielétrica de uma configuração de eletrodos de teste, capaz de representar o estresse elétrico interfacial ao longo da superfície dos componentes de isolamento de um transformador. O estudo baseou-se em curvas de projeto da indústria e no método do estresse elétrico cumulativo, bem como em modelagem e simulações empregando engenharia assistida por computador através do Método dos Elementos Finitos (MEF) no software Ansys Electronics® e análises no software MATLAB®. Os resultados apresentados permitem validar o modelo de testes, garantindo que a ruptura dielétrica ocorra na região desejada, para a realização de ensaios dielétricos experientais. Além disso, com base em uma metodologia estatística, realizou-se a definição do número mínimo de amostras de papel necessário para a execução do ensaio dielétrico, com o intuito de garantir que se obtenham resultados com relevância estatística.
Prevalence of Wound Infection in Patients Undergoing Elective or Emergency Abdominal Surgery
Authors: Mahmood Arshid , Ahmad Aqeel , Muzaffar Muhammad Hammad , Ahmad Sarfraz
Published: August 2021

Objective: To compare the surgical wound infection in patients undergoing elective or emergency abdominal surgeries. Study Design: Comparative study Place & Duration of Study: Study was conducted at surgery department of Divisional Headquarter Teaching hospital Mirpur Azad Kashmir for eighteen months duration from June 2019 to November 2020. Materials and Methods: 150 patients of both genders with ages 15 to 65 years who received laparotomy treatment due to intra-abdominal infection or complicated appendicitis were included in this study. Patient’s medical history, age, sex and residency were recorded after taking informed consent. All the patients were divided into two groups, Group A contained 75 patients (Elective) and Group B contains 75 patients (emergency) received laparotomy. Deep surgical wound infection was examined at the 7th day after surgery and compared between both groups. Results: Ninety eight (65.3%) patients 49 in each group were males and 52 (34.7%) patients 26 in each group were females. In Group A and B 27 and 29 patients were ages 15 to 30 years, 33 and 31 patients had ages 36 to 45 years, 15 and 15 patients were ages between 46 to 60 years. 10 (13.3%) patients in Group A and 12 (16%) patients in group B had deep surgical infection within 1 week after surgery. Statistically there is no significant difference between the both groups (p>0.356) Conclusion: It is concluded that the frequency of wound infection was high in emergency abdominal surgeries as compared to patients undergoing elective surgery, but the difference was not statistically significant. Keywords: Emergency laparotomy, Deep surgical site infection, PO Drain placement
ST-Segment Resolution on ECG after Streptokinase with Stemi in Diabetics
Authors: Fayyaz Saira , Kiani Azher Mehmood , Saboor Qazi Abdul , Bashir Husnain , Adhikari Rakesh Bahadur , Mahmud Talha , Hilal Abubaker , Ibrahim Waseem
Published: August 2021

Objective: observe effectiveness of streptokinase in diabetic cases presenting with ST-segment elevation myocardial infarction Methodology: In this descriptive case series we enrolled 200 cases fulfilling inclusion/exclusion criteria from the emergency department of Cardiology, Rawalpindi Institute of Cardiology, Rawalpindi. The inj. Streptokinase 1.5 million units diluted in 100 ml of normal saline administered over 1 hour and efficacy was observed. Results: Of 200 diabetic STEMI cases, the effectiveness in terms of ST segment resolution by streptokinase in diabetics presenting with ST-segment elevation myocardial infarction (STEMI) was recorded as 38.5%(n=77). Conclusion: The frequency of effectiveness of streptokinase in diabetic cases for resolution of STEMI is encouraging and it can be used as first line therapy. Keywords: STEMI, Diabetics, Streptokinase, efficacy
Students’ grammatical error analysis in the recount text translation
Authors: Sari Nilam Puspita , Putrawan Gede Eka , Deviyanti Rafista
Published: August 2021

This research aims to determine the types of grammatical errors that students make the most and least frequently, as well as the causes of those errors, using the Surface Strategy Taxonomy that was identified in students' recount text translation. The participants in this study were SMAN 1 Pringsewu first-graders in the academic year 2020/2021. This research adopted a descriptive qualitative method by using a translation task and questionnaire for the instruments. According to the Surface Strategy Taxonomy, the students made all types of errors: omission, addition, misformation, and misordering. In recount text translation based on Surface Strategy Taxonomy, the most common error made by students was misformation, whereas the least frequent error type was misordering. Problems with the target language, mother-tongue interference, a lack of eagerness to learn the target language, a lack of confidence, and the absence of error feedback from the teacher were all possible causes of those errors. This indicates that the students’ English grammar understanding was still limited. Therefore, the English teacher is expected to solve it by providing appropriate teaching methods and materials to reduce errors.