bluuebunny/crossref_metadata_2025 huggingface dataset:
Prácticas agronómicas para la siembra de un cultivo de caucho (Hevea brasiliensis)
Authors: Herrera Betancourt Derly Xiomara , Carmen Carrillo Nydia , Echeverry Rodrigo
Published: July 2021

El cultivo de caucho natural en Colombia ha presentado un crecimiento notorio en los últimos años, debido a su gran participación en la industria transformadora siendo materia prima clave para una gran variedad de productos terminados que van desde aplicaciones especializadas tales como las llantas, hasta artículos de aseo de consumo masivo como los guantes, por lo cual este trabajo tuvo como objetivo dar a conocer el cultivo de caucho (Hevea brasiliensis) en sus etapas de vivero y establecimiento temprano en los municipios de Paratebueno (Cundinamarca) y Mapiripán (Meta), haciendo un recorrido por las distintas actividades que se desarrollan en la producción y mostrando algunos resultados obtenidos en las mismas, como diversas evaluaciones que se realizaron en el vivero como método de aprendizaje y posibles soluciones a los problemas que se presentan en un debido momento, finalmente se analizaron los resultados obtenidos de las actividades y evaluaciones, generando elementos y conocimientos que permiten profundizar en el tema. Se concluye que el vivero de caucho establecido en el municipio de Paratebueno, cuenta con las condiciones apropiadas para su crecimiento, no solo por su ubicación geográfica, sino también las buenas actividades agronómicas que se desarrollan como son la fertilización, riego en época de verano, control de arvenses y los monitoreos diarios del manejo integrado de plagas y enfermedades; además el vivero y la plantación de dos años de edad se encuentran en excelente estado, puesto que son constantes las observaciones en el cultivo, con lo cual se logra evitar posibles daños de plagas y enfermedades, y corregir deficiencias nutricionales.
Establecimiento de gramíneas en fincas ganaderas en zonas de trópico bajo
Authors: Zapata Sánchez Julián Alberto , Moreno Torres Julio Cesar , Figueredo Castañeda Luis Alejandro
Published: July 2021

Debido al creciente aumento de la población humana, se hace indispensable aumentar la producción de alimentos, mediante una eficiente maximización de los diferentes recursos agropecuarios. En este mismo sentido, en los departamentos de Meta y Vichada, Colombia, ubicados en trópico bajo, los rendimientos productivos son bajos y por lo tanto la rentabilidad es mínima o nula en el sector ganadero, condición que desde luego no estimula el incremento de la producción ni el establecimiento de gramíneas para pastoreo, en cambio, si hace que los terrenos que eran especialmente ganaderas se estén sembrando cultivos como: maderables, palma, caucho, caña, maíz y soya. Los pastos constituyen la fuente fundamental de alimentación de los rumiantes, se cultivan y manejan como cualquier otra planta, y bien establecidos, permiten abastecer gran cantidad de animales por unidad de superficie, situación que se consideró en la altillanura ondulada y serranía en los que se encuentran las fincas asistidas, siendo categorizados sus suelos como oxisoles, los cuales tienen en promedio un pH de 4.5, baja disponibilidad de Ca, Mg, K, P, saturación de aluminio mayor de 65% y son susceptibles a la degradación. Por lo anterior se decide utilizar una la enmienda recomendada para suelos deficientes en nutrientes y que contiene: cal dolomita, yeso y roca fosfórica. En el establecimiento y/o renovación de praderas, la supervisión y monitoreo fue constante a los lotes sembrados, lo cual ayudó a corregir los problemas que se presentaron durante dicha actividad, además también permitió tomar decisiones a tiempo, porque en el establecimiento de las praderas se deben manejar improvistos como lluvias, disponibilidad de maquinaria, y desarrollo de las plantas, entre otros, que deben solucionarse adecuadamente acorde con lo planeado evitando generar costos adicionales. La aplicación de enmiendas no tiene que ser solo para corregir los suelos con deficiencias, como son los de las fincas de esta zona, sino que además se incorporen minerales como constituyentes nutricionales, puesto que la cantidad, composición y calidad de la enmienda se verá reflejada a futuro en las praderas.
Pseudoparalysis of Marginal Mandibular Nerve Branch by Big Submandibular Gland Sailolith: A Case Report
Authors: Kaur Rajwant
Published: July 2021

Sailolithiasis is the second most common etiology of salivary gland after sialadenitis. Present case of 29 years old male patient with giant submandibular sailolith with stony hard feel below the left angle of the mandible. X ray and CECT neck used for confirmation. Because of big stone incidental finding of pressure paresis of marginal mandibular nerve was noticed. Even patient unaware of that. En-block Submandibular salivary gland excision was done by trans-cervical approach with complete recovery of the nerve within 3-4 post-operative weeks.
Auditory Rehabilitation Post-Cochlear Implant
Authors: Diamante Gabriela
Published: July 2021

Introduction: In the present work, a review is conducted on hearing loss, its origin, the consequences of the lack of a timely treatment, the possibilities and benefits provided by the access to a cochlear implant and the corresponding auditory rehabilitation. Materials and Methods: The methods used in the present work were Ling Test, Vowel Recognition, Consonant Recognition, Two-syllable Word Test, and Open-set Sentence Recognition. Results: By means of a descriptive study of a population that received a cochlear implant and after one year of use, we can observe high rates of auditory discrimination in all the variables presented and their levels of requirement and complexity, showing a close relationship between an appropriate and timely approach and a successful auditory rehabilitation. Conclusion: In all of the cases in this sample, the cochlear implant led to an improved quality of life for both the patients and their family members, allowing children to develop the language and improve their performance in school activities, and adults to appropriately reintegrate into society.
Diagnostic Dilemma in a Carotid Body Tumor: A Case Report
Authors: Islam Md Ashraful
Published: July 2021

An asymptomatic swelling in the neck region has many differential diagnoses. Most common of them is reactive lymphadenitis and carotid body tumor being the last thing. We present here a case of carotid body tumor that misguided us on clinical and radiological ground. It was suspected intra-operatively and confirmed by histopathological examination. Carotid body tumors are rare neoplasm. It arises from the chemoreceptor cells of the carotid bulb. We report a case of carotid body tumor in a 57-year-old female, who presented with painless, gradually progressive lateral neck swelling. The diagnosis is suspected on the basis of clinical radiological and per-operative examination findings. Histopathological examination confirms the diagnosis of carotid body tumor
Software System of Decoding Light Codes
Authors:   Lviv Polytechnic Natioinal University, Barsiienko Vladyslav , Lashko Oksana
Published: July 2021

The paper presents the stages of creating a software system for decoding light codes and examines the effectiveness of its operation. The relevance of the development is due to the need to combine the speed and distance of information delivery for the further development of wireless communication systems. The authors’ attention is focused on considering the basic components of the designed system. The main algorithms of operation have been presented and the effectiveness of their development has been proved. A comparison with existing means has been made and the prospects for the development of cable free optical communication systems have been emphasized.
Implementation Kalyna Algorithm in Microcontroller
Authors:   Lviv Polytechnic National University, Computer Engineering Department, Bilenko Volodymyr , Hlukhov Valerii
Published: July 2021

The information security is playing an increasingly important role nowadays. Therefore, virus can be transmitted through the information in encrypted form. This is also applied to embedded systems. In this regard, the article is assigned to the topic of cryptocurrency protection in embedded systems using the national Ukrainian standard Kalyna. To further explore the topic, this algorithm was implemented on a microcontroller to test the performance, convenience and prospects for usage in embedded systems.
Acquisition and Processing of Data in CPS for Remote Monitoring of the Human functional State
Authors:   Lviv Polytechnic National University, Computer Engineering Department, Hupalo Petro , Melnyk Anatoliy
Published: July 2021

Data acquisition and processing in cyber-physical system for remote monitoring of the human functional state have been considered in the paper. The data processing steps, strategies for multi-step forecasting evaluation metrics and machine learning algorithms to be implemented have been analysed and described. What is important, this way it will be possible to track the condition of the sick and response to the health changes in advance.
Software Implementation of Gesture Recognition Algorithm Using Computer Vision
Authors:   Lviv Polytechnic National University, Computer Engineering Department, Kotyk Vladyslav , Lashko Oksana
Published: July 2021

This paper examines the main methods and principles of image formation, display of the sign language recognition algorithm using computer vision to improve communication between people with hearing and speech impairments. This algorithm allows to effectively recognize gestures and display information in the form of labels. A system that includes the main modules for implementing this algorithm has been designed. The modules include the implementation of perception, transformation and image processing, the creation of a neural network using artificial intelligence tools to train a model for predicting input gesture labels. The aim of this work is to create a full-fledged program for implementing a real-time gesture recognition algorithm using computer vision and machine learning.
Using Improved Homophonic Encryption on the Example of Code Zodiac Z408 to Transfer Encrypted Information Based on Data Traffic
Authors:   Lviv Polytechnic Natioinal University, Mamro Oleksandr , Lagun Andrii
Published: July 2021

The improvement of homophonic encryption using the well-known Z408 cipher as an example has been examined in this article. Their problems to further correct the main shortcomings of this type of encryption have been analyzed. In the practical part, an encryption system similar to Z408 has been created and the complexity of the language analysis for this cipher has been increased. The correlation data of the number of alternative characters has been used to improve the transmission of encrypted data depending on the load of the device. The more symbols and the higher the load, the fewer the number of alternative symbols will be used.
Model of Process Synchronization in Through Analysis
Authors:   Odessa Polytechnic State University, Martynyuk Oleksandr
Published: July 2021

Synchronization of parallel processes of distributed information systems (DIS) has been largely determined by decisions taken at the stages of their design. Having already been in structural and functional models, when determining cause- and-effect relationships for events and actions in DIS components, it becomes necessary to coordinate them. In the proposed multilevel systemic, structural and functional synchronization model, a hierarchy of such causal relationships with interlevel mappings, inheritance and encapsulation of events and actions have been formed. The model has been also based on hierarchical extended Petri nets, which make it possible to represent various aspects of a special analysis of technical diagnostics, in particular, analysis of correctness, verification, testing, for the adopted display of the asynchronous-behavioral nature of the multilevel interaction of DIS processes. Features of the synchronization model include mapping operations for cross- level inheritance and encapsulations that synchronize events and actions, as well as end-to-end synchronized quasi-order relationships and compatibility for them. The synchronization model is also distinguished by the possibility of specializing its objects, operations and relations for the tasks of check and recognition of behavioral properties set for analysis and verification, basic in technical diagnostics, including in online and offline testing. The synchronization model has allowed one to determine the formal conditions for methods of end-to-end asynchronous coordination of events and actions of multi-level models, that represent design solutions for DIS, in particular, for technical diagnostics methods, and also to reduce the computational complexity of a special synchronization analysis due to an end-to-end decomposition approach. The dimension of the synchronization model has been estimated using the representation of Petri net graphs and special graphs of reachable states using list structures. The above estimates determine the limits of applicability of the formal synchronization model.
System for Effective Small Business Support
Authors:   Lviv Polytechnic National University, Computer Engineering Department, Pavlenko Volodymyr , Lashko Oksana
Published: July 2021

This paper considers the problem of developing specialized software designed to support small businesses. It substantiates the relevance of creating such systems; architecture has been offered; and the results of development have been given. For practical use, a specific subject area has been considered, which allows to clearly understand the purpose and outcome of the work. These materials can be used to obtain ready-made solutions during the development of a software package on this topic. This document can be considered as an introductory material for the various stages of the project to develop a system of effective support of small business.
Online Video Platform with Context-aware Content-based Recommender System
Authors:   Lviv Polytechnic Natioinal University, Pisotskyi Marian , Botchkaryov Alexey
Published: July 2021

The problem of developing an online video platform with a context-aware content-based recommender system has been considered. Approaches to developing online video platforms have been considered. A comparison of popular online video platforms has been presented. A method of context-aware content-based recommendation of videos has been proposed. A method involves saving information about user interaction with video, obtaining and storing information about which videos the user liked, determining user context, composing a profile of user preferences, composing a profile of user preferences depending on context, determining the similarity between the video profile and a profile of user preferences (with and without context consideration), determining the relevance of the video to the context, the conclusive estimation of the relevance of the video to the user’s preferences based on the proposed composite relevance indicator. The developed structure of online video platform has been presented. The algorithm of its work has been considered. The structure of the online video platform database has been proposed. Features of designing the user interface of the online video platform have been considered. The issue of testing the developed online video platform has been considered.
Investigation of Greenhouse Monitoring and Control System
Authors:   Lviv Polytechnic National University, Computer Engineering Department, Sahaidak Tetiana , Huzynets Nataliia
Published: July 2021

Unsuitable climatic conditions, various natural disasters and instability and unpredictability of the weather significantly complicate cultivation, and sometimes make it even impossible. To ensure the best conditions for cultivation and the highest yields, farmers began to use greenhouses. However, in our hectic lives, people are constantly busy with something and there is no enough time. Long trips, business trips, vacations are also possible. It is becoming increasingly difficult to provide the necessary conditions for plants to grow on their own. That is why the Internet of Things has been so successfully integrated with agriculture that it has led to the emergence of automated or intelligent greenhouses. The article attempts to analyze the types of greenhouse monitoring and control system, their technical characteristics, principles of operation and basic requirements for these systems. According to the results of the study, the best smart greenhouses have been selected. The main functions of automated greenhouses have been described. Selection criteria have been determined and a comparative analysis of the most popular products available on the market.
The Online Platform „eSchool“
Authors:   Lviv Polytechnic Natioinal University, Skrypnyk Denys , Yurchak Iryna
Published: July 2021

The internet is a global network that is used in any industry. Large corporations have long used the electronic way of doing business. Due to the COVID-19 pandemic, more and more government and commercial structures are switching to online and, therefore, using the electronic circulation of documents and other important things for them. Educational institutions were the most unprepared for such changes, and therefore, they faced an acute question of how to transfer everything online. The purpose of the development is to design and implement a convenient, simple, and most importantly, fast accounting system for educational institutions, which can reflect the educational process in a convenient way, both for students/students and teachers/teachers.
Recommendation Dialog System for Selecting the Computer Hardware Configuration
Authors:   Lviv Polytechnic National University, Computer Engineering Department, Svystun Oksana , Yurchak Iryna
Published: July 2021

The development of modern technologies is extremely fast. Every day more and more new and various means appear in the world to improve the quality of life and more. It is not possible for a person to process all this new information on the scale and speed with which this information appears. Everyone has their own preferences and wants to receive and obtain information about certain events or things that they are interested in. This has become one of the most important reasons for creating referral systems. The purpose of developing a recommended dialog system for selecting the computer hardware configuration is to help users choose the computer’s hardware characteristics to suit their requirements and needs. This system is suitable for being used by both qualified users in this field, and for users unfamiliar with computer technology. There has been an attempt to analyze the types of recommendation dialog systems and their varieties in the paper. The principle of operation of the recommendation dialog system in the form of a chat bot made on the platform of the messenger Telegram has been considered.
Software Service with a Plug-in Architecture for Text Readability Assessment
Authors:   Lviv Polytechnic National University, Computer Engineering Department, Tsebryk Bohdan , Botchkaryov Alexey
Published: July 2021

The problem of developing a software service with a plug-in architecture for assessing the readability of text has been considered. The problem of text readability assessment has been analyzed. Approaches to the development of a software service for text readability assessment have been considered. The structure of the service for text readability assessment has been proposed. The structure of the service has been implemented using the Python programming language and the library Natural Language Toolkit (NLTK). The results of testing the service for text readability assessment have been presented.
INVESTIGASI AIR TANAH BERDASARKAN NILAI RESISTIVITAS DI DUSUN JATISARI, KABUPATEN LAMPUNG SELATAN
Authors: Paembonan Andri Yadi , Nugraha Purwaditya , Santoso Nono Agus , Firdaus Ruhul , Ekawati Gestin Mey , Rahmanda Virgian , Amijaya Felik Destian Putra
Published: July 2021

Air tanah adalah sumber air tawar terbesar yang tersedia.  Air tanah ini sangat penting untuk kehidupan manusia maka dari itu perlu adanya identifikasi zona air tanah yang potensial sebagai salah satu solusi untuk krisis air bersih. Namun pada sebagian daerah sangat sulit untuk menemukan air tanah yang baik karena disebabkan oleh kondisi geologi yang kompleks. Penelitian ini bertujuan untuk mendapatkan informasi keberadaan air tanah dari variasi nilai resistivitas bawah permukaan dengan menggunakan metode Vertical Electrical Sounding (VES) di wilayah Dusun Jatisari, Desa Jatimulyo, Kecamatan Jati Agung, Lampung Selatan. Keberadaan air tanah umumnya memiliki nilai resistivitas rendah hingga sedang. Oleh karena itu, hasil dari penelitian ini akan sangat membantu masyarakat dalam mengetahui kedalaman zona jenuh air (akuifer) untuk mendapatkan air bersih. Dari hasil yang diperoleh terlihat bahwa air tanah dengan rentang nilai resistivitas 10 – 35 Ohm.m berada pada kedalaman yang berbeda-beda. Pada titik VES PKM_S1, PKM_S2, dan PKM_S3 lapisan akuifer berada pada kedalaman 7.5 m, sedangkan titik VES PKM_S4 berada pada kedalaman 36 m, dan titik VES PKM_S5 berada pada kedalaman 8.5 m.
INVERSI DATA GEOLISTRIK MENGGUNAKAN PARTICLE SWARM OPTIMIZATION: STUDI KASUS DESA GAYAU
Authors: Farduwin Alhada , Antosia Risky Martin , Putri Intan Andriani , Santoso Nono Agus , Irawati Selvi Misnia
Published: July 2021

Desa Gayau yang terletak di Kecamatan Padang Cermin, Kabupaten Pesawaran sering mengalami kekeringan air pada saat musim kemarau sehingga perlu dilakukannya pengukuran geolistrik untuk mengidentifikasi keberadaan lapisan akuifer air tanah. Pada penelitian ini konfigurasi yang digunakan adalah Schlumberger dengan panjang bentangan MN/2 sebesar 1, 5, 10, dan 20 meter. Sedangkan panjang bentangan AB/2 sebesar 6 hingga 300 meter. Pada tahapan inversi data VES, kami menggunakan algoritma Particle Swarm Optimization (PSO) untuk memperoleh nilai parameter resistivitas dan ketebalan lapisan. Algoritma ini dipilih karena cepat menuju konvergen dan relatif stabil. Hasil dari inversi ini diperoleh bahwa lapisan akuifer pertama berada pada kedalaman 21.4 - 52.1 meter dengan litologi batupasir berbutir halus dengan sisipan tufa Lapisan akuifer kedua berada pada kedalaman 52.1-70 meter dengan litologi breksi. Pada kedalaman 70 meter diinterpretasikan sebagai akuifer air tanah, namun memiliki debit yang kecil. Hal ini disebabkan karena litologi lapisan berupa breksi, dasit dan lava basal dari Formasi Hulusimpang. Sistem aliran air tanah pada lapisan ini merupakan sistem media pori yang berakibat pada debit rendah dan waktu pengisian kembali lapisan air tanah relatif lama.
ANALISIS KARAKTERISTIK LAPISAN SEDIMEN BERDASARKAN DATA MIKROTREMOR DI AREA RUMAH SAKIT PENDIDIKAN UNILA
Authors: Hesti Hesti , Suharno Suharno , Mulyasari Rahmi , Hidayatika Akroma
Published: July 2021

Provinsi Lampung memiliki kondisi geografis kompleks,  dilewati jalur bukit Bukit barisan Barisan dan terletak diantara dua lempeng yaitu Indo-Australia dan Eurasia. Provinsi Lampung juga  merupakan wilayah yang dekat  dengan Samudera Hindia dan terletak pada zona Sesar Semangko (Sumatra Transform Fault Zone) yang terbentang dari Aceh sampai Teluk Semangka Lampung. Dengan demikian penataan wilayah dan pembangunan infrastruktur yang berbasis mitigasi gempabumi merupakan hal yang sangat penting dilakukan. Tujuan penelitian ini adalah mengetahui karakteristik lapisan batuan sedimen pada area pembangunan Rumah Sakit Pendidikan Universitas Lampung (RSP Unila) sebagai bagian dari tahapan mitigasi bencana gempabumi.  Penelitian ini dilakukan dengan menggunakan metode mikrotremor dan analisis geologi permukaan. Data pengukuran metode mikrotremor dianalisis dengan menggunakan metode analisis Horizontal Vertical Spectrum Ratio (HVSR) untuk mendapakan nilai amplifikasi (A0) dan frekuensi dominan (f0).Hasil dari analisis HVSR diperoleh nilai frekuensi dominan (f0) berkisar 0.65–1.2 Hz, amplifikasi (A0) berkisar 3.33–5.62, dan nilai periode dominan (T0) 0.6–1.5 sekon. Nilai A0, f0, T0 diinterpreasikan dengan mengacu data literatur dan geologi permukaan yang relevan. Hasilnya menunjukkan bahwa daerah penelitian memiliki jenis lapisan sedimen yang rentan terhadap peristiwa gempabumi.
GEOTHERMAL POTENTIAL ON SUMATRA FAULT SYSTEM TO SUSTAINABLE GEOTOURISM IN WEST SUMATRA
Authors: Utama Hari Wiki , Mulyasari Rahmi , Said Yulia Morsa
Published: July 2021

Sumatra Island is an island that is traversed an active ring of fire at Barisan Range which is related to the active Sumatra fault system and geothermal manifestations. It is associated with geothermal manifestations in Cubadak, Talu, Bonjol, and Rimbo Panti, Pasaman Regency, and West Pasaman Regency, West Sumatra Province, as an indication of a geothermal system connected to the Sumatra Fault System from the Sianok Segment and the Talamau Volcano Complex. Sustainable geotourism has become effective for sustainable development of geotourism, the geothermal energy direct utilization. The purpose of this study is to provide sustainable geotourism from geothermal potential in the fault system, taking into account aspects of village geotourism, ecotourism, ecoculture, and education. The methodology used in this study is to collect data on geothermal manifestations from regional geological maps and field observations in geothermal manifestation areas by considering sustainable geotourism. A simple model of sustainable geotourism is made. Study results indicate several locations of potential geothermal manifestations to be used as sustainable geotourism associated with the Sumatra Fault System and the Talamau Volcano Complex.
ALTERASI DAN MINERALISASI BIJIH PADA BATUAN DIORIT DI DAERAH WOMBO, SULAWESI TENGAH
Authors: Rahmaningrum A. Nurul Novia , Asrafil Asrafil
Published: July 2021

Daerah Wombo Kecamatan Tanantovea Kabupaten Donggala Provinsi Sulawesi Tengah merupakan salah satu daerah yang diduga mempunyai potensi mineralisasi bijih. Hal ini diindikasikan dengan adanya kenampakan permukaan berupa batuan diorit yang telah mengalami alterasi. Penelitian ini bertujuan untuk mengidentifikasi karakteristik alterasi hidrotermal dan mineralisasi bijih dengan metode penelitian lapangan dan analisis laboratorium berupa petrografi, XRD dan mineragrafi. Berdasarkan analisis petrografi dan XRD, alterasi hidrotermal dicirikan oleh alterasi propilitik (klorit-zeolit-kalsit) dan alterasi argilik (illit-kuarsa-kalsit). Berdasarkan analisis mineragrafi, mineralisasi bijih di daerah penelitian dicirikan oleh kehadiran pirit (FeS2), kalkopirit (CuFeS2) dan kovelit (CuS). Hasil interpretasi menunjukkan bahwa urutan pembentukan mineral bijih berdasarkan pengamatan tekstur yaitu diawali dengan pirit yang hadir mengisi rekahan-rekahan pada batuan, kalkopirit intergrowth dengan pirit yang menandakan kalkopirit hadir bersamaan dengan pirit, replacement kovelit terhadap kalkopirit dan pirit menunjukkan kehadiran kovelit setelah pirit dan kalkopirit.
GEOLOGI GUNUNGAPI PURBA SOREANG DAN IMPLIKASINYA TERHADAP POTENSI CEBAKAN EMAS
Authors: Ikhram Rinaldi , Arifin Irfan , Sophian R. Irvan
Published: July 2021

Gunungapi Purba Soreang yang terletak di Kabupaten Bandung merupakan gunungapi yang tidak aktif dan tererosi kuat. Daerah ini memperlihatkan susunan litologi gunungapi strato-vulanik serta memiliki morfologi perbukitan bergelombang tak beraturan dan bukit-bukit soliter. Penelitian ini dilaksanakan untuk mengetahui hubungan geomorfologi dan geologi Gunungapi Purba Soreang dengan potensi keberadaan cebakan emas. Metode yang dilakukan adalah analisis geomorfologi, pemetaan vulkanostratigrafi dan analisis struktur geologi serta identifikasi zona alterasi dan mineralisasi. Berdasarkan peta morfografi dan kemiringan lereng, daerah penelitian menunjukan bentuk bentang alam khas gunungapi berupa bentuk yang menyerupai lingkaran atau circular feature yang dihasilkan oleh batuan intrusi, kubah lava, dan leher gunungapi purba, sebagai petunjuk lokasi sumber erupsi. Produk gunungapi purba Soreang memperlihatkan fasies sentral hingga distal dalam beberapa satuan gumuk dan khuluk. Litologi penyusun daerah ini di antaranya intrusi andesit dan diorit yang sebagian besar telah mengalami alterasi hidrotermal, perselingan lava dan breksi piroklastika dan tuff. Litologi ini menunjukkan bahwa Gunungapi Soreang merupakan jenis strato-vulanik. Di area Gunungapi Purba Soreang ini telah dilakukam eksplorasi potensi mineralisasi emas pada zona sentral. Pertambangan tradisional juga telah dilakukan oleh masyarakat lokal.  Berdasarkan analisis terpadu bentang alam dengan litologi, perkiraan tubuh Gunungapi Purba Soreang dan zona sentral gunungapi tersebut dapat diidentifikasi. Hasil identifikasi tersebut digunakan untuk membantu penetapan area eksplorasi potensi cebakan emas di wilayah Soreang.
JGE Cover July 2021
Authors: JGE Editor
Published: July 2021

JGE Cover July 2021
Foreword July 2021
Authors: JGE Editor
Published: July 2021

Foreword July 2021
Analysis of a First Unilateral and Then Bilateral Internal Jugular Vein Thrombosis in a Heroin User
Authors: Borodavko Dmytro , Abramenko Artem , Fesenko Ievgen , Cherniak Olha
Published: July 2021

This report documents a first unilateral and then bilateral internal jugular vein (IJV) thrombosis as a result of repeated injections of heroin, which is rare in a practice of oral and maxillofacial surgeon. The patient was a 21-year-old male who was referred to a hospital with the diagnosis of phlegmon of the right neck. Emergency non-contrast computed tomography (5 images and 1 Supplemental Video are presented) revealed a hyperattenuating content in the lumen of expanded right IJV which fills its entire length. The patient received initial treatment according to the protocol. Ultrasound (US) (2 images and 2 Supplemental Videos are presented) in a first 24 hours supported the diagnosis describing a case as occlusive acute thrombosis. After 4 days of a positive dynamic the patient was transferred to outpatient mode. In a 10 day US examination (2 images and 2 Supplemental Videos are presented) simultaneously with positive changes in the lumen of a right IJV (partial clot lysis) an appearance of a left IJV thrombosis was noted. Analysis of thrombotic conditions of the neck, diagnostics methods, treatment options, and complications are performed.
Factors Affecting on Knowledge Sharing Among Undergraduate Students
Authors: Ali Walaa J.
Published: July 2021

The purpose of this study is to exam the impact of trust, attitude, and information communication Technology on Knowledge sharing among undergraduate students. However, previous studies paid little attention to exam knowledge sharing among students, particularly in the Iraq setting. The study conducted at Cihan University-Erbil, Iraq, in the College of Administrative and Financial Sciences. The data collected by the questioner tool and the questioners randomly distributed among students by self-administrative. the data were analyzed by AMOS software. The results showed that all three variables, namely trust, attitude, and information communication technology, have a positive and significant impact on Knowledge sharing among undergraduate students. However, trust showed is the most vital factor that enhances and increases the sharing of knowledge among students. University should improve the culture of knowledge sharing among students to increase their productivity and knowledge.
The Motivational Impact of Enhancing Reading Comprehension through Pictorial Fictions on the Involvement of Iranian EFL Students in Writing Activities
Authors: Rasouli Fereydoon , Ahmadi Omid
Published: July 2021

Determining the motivational impact of enhancing reading comprehension, through pictorial fictions, on the EFL students to involve them more in writing activities, is the prime purpose of the present study. The study took place in the Iranian Language Institute (ILI), the branch of Mahabad. Key English Test (KET) administrated to a hundred students to select the subjects of the present study. Finally, 60 male students were selected and randomly divided into the experimental and control groups. The experimental group received pictorial fictions as treatment, utilizing input reading comprehension enhancement through typographic elements, and direct and indirect feedback provided to them, while the control group received pictorial fiction texts without such inputs, then to collect the intended data, the "Academic Writing Motivation Questionnaire" (AWMQ) was administered to both groups separately in two stages of pre-tests and post-tests. The results showed that enhancing reading comprehension has a significant motivational impact on the writing engagement of Iranian EFL learners.
Study the Prevalence, Characteristics of Mothers and Associated Risk Factors of Pica Eating among Pregnant Women
Authors: Galali Yaseen M.
Published: July 2021

Eating disorder is a common phenomenon accompanying pregnancy including ingestioning non-nutrtitve substances. Causes of pica are uncertain. The purpose of this study therofre is to assesse prevalnce, characteretics and risk factos of pica among Kurdish pregnant women. A cross sectioal study was conducted in Iraqi Kurdistan and the information regarding sociodemographic infromation, prevalence and characterestics of and risk facros were collected. Four hundred woment were registered  and interviewed for this study. The resuslts: data showed that prevalence of pica was 60.5% (242), and the most frequenct  forms of pica eaten were pagophagia and geaphagia and amylophagia by 29.7% (119), 25.3% (101) and 12.5% (50) respectively. Data showed that pica is related to mother education (P=0.011), mother occupation (P=0.002), living place( P=0.011), health complication duering pregnancy ( P=0.018) and affects bread feeding (P=0.040). Baby gender, mother age, Iron suppelemtation, hisotry of child abortion and economic satisfacton weren not signicantly associated to pica eating.  The results also showed that psychlogical factors  for pica eating was reduce nausia, amilearate stress and axiety and very fewer pregnant used to control hunger. Conclusion: Mother should check for any health complication before pregnancy and receive enough and regualr check as well as edcuate themselves regarding consequence of pica. Also psychological consultation is important throughout pregnancy period.
The Comparative Study of Biaxial Bending Analysis of Steel Sections Using AISC and Eurocode Approaches
Authors: Saleh Mohammed M. , Ahmed Dlshad K. , Yousef Ali R.
Published: July 2021

ABSTRACT

This study investigates the capacity of the steel section using both AISC and Eurocode approaches by Robot Structure Analysis software. Three types of steel sections were subject to biaxial bending by applying loads to both main axes and examined by both approaches. The concept of Fisher was also adopted as an approach. The findings suggested that the Eurocode approach is more conservative in the design of steel sections subject to biaxial bending as it takes into account the level at which the load is applied, the type of the section whether rolled or welded and its height-to-width ratio (lateral buckling effect), the effects which are not considered in AISC approach. The AISC approach considers the shear center of the section as the level at which the loads are applied. The conservatism of the results was more pronounced when the section is close to H-section. Fisher`s concept of structural design of biaxial bending of structural steel is more conservative than both AISC and Eurocode approaches of analysis.
Interreligious Relations in the Structural Daâ€™wah Framework
Authors: Zain Arifin , Maturidi Maturidi
Published: July 2021

This paper examines the Medina Charter, the 1945 Constitution, and Aceh Qanun No. 4 of 2016 as a fundamental source of structural daâ€™wah policies. Structural daâ€™wah is a character of daâ€™wah that involves the state directly in regulating policies related to the implementation of daâ€™wah. The primary purpose of this research is to describe the role and position of the Medina Charter, the 1945 Indonesian Constitution, and Aceh Qanun No. 4 of 2016, being the basis for the implementation of structural daâ€™wah and discussed the regulation about the inter-religious correlation in those three regulations. This research is qualitative research using the content analysis method. The results showed that the Medina Charter, the 1945 Indonesian Constitution, and Aceh Qanun No. 4 of 2016 is a state acknowledgment of the structural daâ€™wah implementation in Aceh because the daâ€™wah is under the direct control of the state or government. The Medina Charter, as a result of the Prophetâ€™s ijtihad, contains guidelines for inter-religious relations and the role of the state in regulating peopleâ€™s lives. The 1945 Constitution of Indonesia is the highest source of law in the Republic of Indonesia, which states the guarantees the independence of citizens to embrace religion according to their beliefs. While Aceh Qanun No. 4 contains the rules for spreading religion amid society.
Improving chemical learning outcomes with explicit instruction learning models with quizizz evaluation media
Authors:   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta 13630, Indonesia, Minanlarat Bropson , Sanga Lamsari Purba Leony ,   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta 13630, Indonesia, Fatimah Azzahra St ,   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta 13630, Indonesia
Published: July 2021

This study aims to determine the effect of explicit instruction learning models and the percentage of student learning outcomes improvement in chemistry. Explicit instruction learning model is the free variable while the dependent variable is learning outcomes. This research method is a quasi experiment with the research design nonequivalent control group design. The population of this study were students of Senior High School 42 Jakarta, the sample was selected by purposive sampling technique, consisting of two classes, namely class XI MIA 1 as the experimental class and XI MIA 2 as the control class. The results of the ttest show that the sig. (2-tailed) is smaller than the α value, namely sig 0.000 < sig 0.05, so learning using the explicit instruction model has a significant effect on improving chemistry learning outcomes on hydrocarbon compound material. In addition, the use of explicit instruction learning models can improve student learning outcomes by 19% when compared with the use of conventional learning models (TCL). Keywords: Explicit instruction, Quizizz, Chemistry learning, Learning outcomes
Development of student worksheet for blended learning based guide inquiry and science process skill in reduction and oxidation reaction
Authors:   Chemistry Education Study Program, Postgraduate, Jambi University, Jambi 36361, Indonesia, Febrilia Miharti Sinda , Harizon Harizon ,   Departemen of Chemistry Education, Jambi University, Jambi 36361,, Zurweni Zurweni ,   Departemen of Chemistry Education, Jambi University, Jambi 36361,
Published: July 2021

This study aims to determine how the procedure for developing blended learning worksheets based on guided inquiry models and science process skills on the material of reduction and oxidation reactions in SMK. The method used in this research is to follow the Lee and Owens development model consisting of 5 stages of development, namely Analysis, Design, Development, Implementation and Evaluation. Analysis includes analysis of needs, characteristics of students, objectives, materials and technology. Design, researchers determine the schedule and development team, median specifications, prepare materials and make Flowcharts and storyboards. Development, develop LKPD according to storyboards, validated by material and media experts, and assessed by the teacher. Implementation includes group trials and effectiveness tests. Evaluation of LKPD in accordance with test results. Keywords: Blended learning, Guide inquiry, Reaction of reduction and oxidation, Science process skill, Student worksheet
Development of PBL-STEM-based E-LKPD to improve students' science literacy skills on reaction rate materials
Authors:   Chemistry Education Study Program, Postgraduate, Jambi University, Jambi 36361, Indonesia, Safitri Rina , Haryanto Haryanto ,   Departemen of Chemistry Education, Jambi University, Jambi 36361, Indonesia, Harizon Harizon ,   Departemen of Chemistry Education, Jambi University, Jambi 36361, Indonesia
Published: July 2021

The development model used is Research & Development which adopts the Lee & Owens development model. The product to be developed is E-LKPD using 3D Pageflip Professional software. 1. The procedure for developing E-LKPD with the PBL-STEM approach in improving scientific literacy skills on the reaction rate material for students. The research procedure consists of five stages, namely analysis, design, development, implementation, evaluation. Research results (1) The analysis includes media analysis, student characteristics analysis, technology analysis, situation analysis, and data analysis. (2) Design includes determining the development team, compiling a development schedule, making flowcharts and making storyboards. (3) Development includes making a product which is then validated by a team of experts until it is validated. (4) Implementation, at this stage a product assessment is carried out by 2 chemistry teachers to see the agreement between the two teachers on the product developed through the kappa test, one-on-one trial with 2 groups of respondents consisting of 3 students in each group, small group trial with two groups of respondents carried out at MAN 2 Jambi City. This trial is not conducted face-to-face, but online (5) Evaluation, which is carried out at each stage is ongoing. The conclusion in this study is that the E-LKPD development procedure is in accordance with the 5 stages of the Lee & Owens development model. Keywords: E-LKPD, PBL-STEM, Science literacy skills
Microsoft teams 365 and online learning: The student’s perception
Authors:   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta 13630, Indonesia, Sanga Lamsari Purba Leony
Published: July 2021

This study aims to determine the effectiveness of online learning using Microsoft Teams 365. The entire population in this study was used as a research sample, namely all students of the Chemistry Education study program, Indonesian Christian University, Jakarta. Perception data was collected using a questionnaire with dimensions of understanding the material, appearance and accessibility of Microsoft Teams 365. From the results of data processing, it was found that more than 50% of students' perceptions of Microsoft Teams 365 were good in all indicators of understanding the material and appearance. On the use dimension with connectivity and accessibility indicators more than 50% of students' perceptions of the Microsoft 365 team are good, but on the quota-saving indicator 42% of students do not agree. Keywords: Microsoft teams, E-learning, Cemistry
Determination of phenolic contents and antioxidant activity test of ethanol extract of Sirih merah (Piper crocatum Ruiz & Pav.) leaves using the DPPH method
Authors:   Department of Pharmacy, Sekolah Tinggi Ilmu Kesehatan Senior Medan, Medan, Indonesia, Gurning Kasta , Lumbangaol Sifikal ,   Department of Pharmacy, Sekolah Tinggi Ilmu Kesehatan Senior Medan, Medan, Indonesia, F. R. Situmorang Risanti ,   Department of Public Health, Universitas Sumatera Utara, Medan, Indonesia, Silaban Saronom ,   Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia
Published: July 2021

The research objectives were to identify the secondary metabolite components, total phenolic content and determine the antioxidant activity of the ethanol extract of red betel leaf (Piper crocatum Ruiz & Pav.). The extraction process was carried out by materation using ethanol as a solvent. Determination of total phenolic content was carried out colorimetrically with Folin-Ciocalteu reagent measured at a maximum wavelength of 765 nm. Determination of antioxidant activity using the DPPH method measured by spectrophotometry at a maximum wavelength of 517 nm. The results of phytochemical screening of the ethanolic extract of red betel leaf contain secondary metabolites, including flavonoid, phenolic, tannin, alkaloids, steroids, and triterpenoids. The total phenolic content of the red betel leaf ethanol extract was 0.949±0.003 mg GAE/g d.w. and has antioxidant activity (IC50) 84,656 including strong category as an antioxidant. Keywords: Piper crocatum Ruiz & Pav., Antioxidant, Ethanol extract, Folin-Ciocalteu and DPPH
Stability of Styrax benzoin extract and fraction with the addition of glycerol and tween 80
Authors:   Chemistry Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Indonesia, P Simatupang Dedi , Susanti Nora ,   Department of Chemistry, Faculty of Mathematics and Natural Science, University Negeri Medan, Medan 20221, Indonesia, Purba Jamalum ,   Department of Chemistry, Faculty of Mathematics and Natural Science, University Negeri Medan, Medan 20221, Indonesia
Published: July 2021

This research to decide the consequences of expanding the steadiness of the concentrate and part of incense with the expansion of glycerol and tween 80 by contrasting the reference tests of frankincense separates available. The technique utilized in this examination depends on the expansion of glycerol and tween 80, just as directing boundaries of consistency, organoleptic, pH and investigation of substance content of concentrates and parts with GC-MS instruments. The outcomes got in this investigation demonstrate the actual properties of the concentrate and part of the incense sap as a thick fluid, earthy red and has an unmistakable fragrant smell. The consistency got from the thickness test was 277.68 Cp. In the meantime, the thickness estimation consequences of the reference test acquired a consistency worth of 326.54 cP. What's more, has a pH scope of 4.0-5.5. The fundamental synthetic parts of the extraction results and the isoprophyl part of styrax benzoin and the reference part of the reference styrax benzoin remove dependent on the consequences of the investigation discovered 6 mixtures that share practically speaking, in particular Benzoic corrosive, Vanillin, trans-Cinnamic corrosive, (Z) - Cinnamyl benzoate, 2-Propenoic corrosive , 3-phenyl-, phenylmethyl ester, (E) - and Cinnamyl cinnamate. Keywords: Styrax benzoin, Glycerol, Extract stability, Tween 80, Fractionation