bluuebunny/crossref_metadata_2025_split huggingface dataset:
SIMULASI LENSA GRATING TERHADAP EFISIENSI DIFRAKSI GRATING PADA SISTEM PEMISAH CAHAYA SPEKTRAL CONCENTRATED PHOTOVOLTAIC/THERMAL
Authors: Laksono Yuke Hary , Novyanto Okasatria 
Published: September 2020

A spectral beam splitting concentrated photovoltaic/thermal (SBS CPVT) system is a new technology in PV areas . In order to split the sunlight, the grating lens is used in this study. The tool of this study is G-Solver software which simulates the diffraction efficiency of visible light and infrared light of the blazed and binary grating lens. The aim of this paper is to analyze the potential of the diffraction efficiency of grating lens when applied in SBS CPVT. The result show that binary grating, the highest diffraction efficiency for the visible light is also almost unchanged for the aspect ratio from 1.4 to 2, but the peak wavelength shift from around 360 nm to 510 nm, while, for IR light, the diffraction efficiency decrease from aspect ratio 1.4 to 2. On the other hand, blazed grating, The highest diffraction efficiency for the visible light is almost unchanged for the aspect ratio from 1.4 to 2, but the peak wavelengths shift from around 350 nm to 500 nm. While IR light, the diffraction efficiency decrease with the aspect ratio 1.4 to 2
GRUP FAKTOR YANG DIBANGUN DARI SUBGRUP NORMAL FUZZY
Authors: Tarmizi Mahfuz , Abdurrahman Saman 
Published: September 2020

A Quotient group is a set which contains coset members and satisfies group definition. These cosets are formed by group and its normal subgroup. A set which contains fuzzy coset members is also called a quotient group. These fuzzy cosets are formed by a group and its fuzzy normal subgroup. The purpose of this research is to explain quotient groups induced by fuzzy normal subgroups and isomorphic between them. This research construct sets which contain fuzzy coset members, define an operation between fuzzy cosets and prove these sets under an operation between fuzzy coset satisfy group definition, and prove theorems relating to qoutient groups and homomorphism. The results of this research are is a qoutient group induced by a fuzzy normal subgroup, where is a fuzzy normal subgroup of a group , is a fuzzy coset, and the binary operation is “” where for every . An epimorphism from a group to a group and a fuzzy normal subgroup of which is constant on cause quotient goup and are isomorphic.
BEBERAPA KOMBINASI RUNGE-KUTTA UNTUK MENENTUKAN SOLUSI PERSAMAAN DIFERENSIAL WAKTU TUNDA
Authors: Qudsi Rahma , Dahlia Agus 
Published: September 2020

Delay Differential Equation (DDE) have been applied to many area. While, we rarely get the analytic solutions of DDE. Many researchers have found many methods to find it for instance Runge-Kutta Method. The purpose of this paper is to accumulate the combinations of Runge-Kutta method which is used to find the solutions of DDE. Keywords : Delay Differential Equation, Interpolation, Runge-Kutta Method
PEMBAGI NOL PADA MATRIKS ATAS RING KOMUTATIF
Authors: Nurhayani Mega , Thresye Thresye , Huda Nurul 
Published: September 2020

Matriks atas ring komutatif adalah matriks yang entri-entrinya dibangun dari ring komutatif. Himpunan matriks atas ring komutatif membentuk struktur ring terhadap operasi penjumlahan matriks dan operasi pergandaan matriks. Struktur yang terbentuk atas matriks yang entri-entri dari ring komutatif atau dapat disimbolkan merupakan ring. Selanjutnya dikatakan ring dengan pembagi nol jika terdapat dua elemen matriks yang tidak sama dengan nol akan tetapi ketika diberikan operasi pergandaan maka bernilai nol. Tulisan ini membahas sifat-sifat pembagi nol pada matriks atas ring komutatif, yaitu jika , dengan adalah ring komutatif, maka matriks merupakan pembagi nol kiri dalam jika dan hanya jika matriks merupakan pembagi nol kanan dalam . Kata kunci : Ring komutatif, pembagi nol, matriks, matriks atas ring komutatif.
Analisis Perbandingan Kandungan Fe dan Karakteristik Sifat Listrik Pasir Besi Sungai dan Pantai
Authors: Didik Lalu A. , Aini Husnul , Zohdi Ahmad 
Published: September 2020

Penelitian ini bertujuan untuk mengetahui perbandingan kandungan Fe dan karakteristik sifat listrik pasir besi sungai dan laut yang disintesis di Kecamatan Pringgabaya. Sampel pasir besi sungai dan laut kemudian dipisahkan menggunakan magnet permanen, setelah itu dicuci menggunakan aquades dan di keringkan selama 2 jam pada temperatur 2000C. karakterisasi material pasir besi sungai dan laut kemudian di lakukan menggunakan AAS (Atomic Absorption Spektrometri), 2 titik probe, dan LCR meter untuk mengukur konstanta dielektrik. Hasil karakterisasi menunjukan bahwa pasir besi sungai dan laut Kecamatan Pringgabaya. Menunjukan adanya perbandingan kandungan mineral, resistivitas dan konstanta dielektrik, kandungan mineral pasir besi sungai lebih besar dibandingkan dengan pantai berkisar dari 9,03 % - 9,8 %, nilai resistivitas sungai dan pantai akan naik pada jarak 10 meter yaitu sebesar 11×104 Ωm dan 10,9×104 Ωm dan konstanta dielektrik sungai dan pantai akan naik pada jarak 10 meter yaitu 13,88×104 dan 15,22×104. Dari hasil tersebut dapat dilihat bahwa adanya perbandingan kandungan mineral sungai dan pantai. Hal ini disebabkan karena adanya pengendapan Fe pada sungai yang menyebabkan kandungan mineral pasir besi sungai lebih besar daripada pantai. pada pengukuran resistivitas dan konstanta dielektrik menunjukan perbandingan nilai resistivitas dan konstanta dielektrik pantai dan sungai. Hal ini disebabkan karena semakin jauh jarak pengambilan sampel nilai resistivitas dan konstanta dielektrik semakin besar, disebakan pasir yang dari sungai setelah mengalir menuju pantai akan teresebar rata dan diikuti percampuran kandungan mineral yang lain, adanya percampuran kandungan Fe dan unsur yang lain menyebabkan nilai resistivitas dan konstanta dielektrik pasir besi pantai lebih banyak karena akan mengandung sifat logam yang mudah menghantarkan arus listrik.
Recursive Solution of Queue Length Distribution for Geo/G/1 Queue with Delayed Min(N, D)-Policy
Authors: Wei Yingyuan , Tang Yinghui , Yu Miaomiao 
Published: September 2020

AbstractIn this paper we consider a discrete-time Geo/G/1 queue with delayed Min(N, D)-policy. Using renewal process theory, total probability decomposition technique and z-transform, we study the transient and equilibrium properties of the queue length from an arbitrary initial state, and obtain both the recursive expressions of the transient state queue length distribution and the steady state queue length distribution at arbitrary time epoch n+. Furthermore, we derive the important relations between equilibrium queue length distributions at different time epochs n–, n and n+. Finally, we give some numerical examples about capacity decision in queueing systems to demonstrate the application of the analytical results reported in this paper.
COVID-19 Outbreak and Behavioral Maladjustments: A Shift from a Highly Globalized World to a Strange World of Unique Isolationism
Authors: Dada Matthew Abiodun 
Published: September 2020

The outbreak popularly called COVID-19 which sneaked into the world system generally believed to have originated from China in the city of Wuhan towards the last quarter of the year 2019 in a manner yet to be unfold by the world powers has been judged to be a great threat to human activities and coexistence. The World Health Organization declared COVID-19 as a global pandemic between February and March, year 2020 and since then it has been a strange world. This paper examined the socio-economic changes and behavioral maladjustments resulting from this deadly disease. The demand and supply shocks as well as the use of fiscal stimulus from different countries and how some key variables respond are well analyzed and structured. The paper underlying some of the damages done to the socio-economic lives of people across the globe and highlight some recovery strategies and future prospects. It recommends spirituality as a winning strategy against carnality. The conclusion was drawn by emphasizing the supremacy of God in the fact that a microbe of invisible property could hastily change our world of global village to a strange world of isolated cities
The Effect of Teaching Strategies and Curiosity on Students’ Achievement in Reading Comprehension
Authors: Astuti Sri , Sihombing Lince , Sibarani Berlin 
Published: September 2020

The objectives of this study are to investigate whether: (1) students’ achievement in reading comprehension taught by using Problem-Based Learning stretegy is higher than students’ achievement in reading comprehension by using Reciprocal Teaching strategy, (2) reading comprehension achievement of high curiosity students is higher than reading comprehension achievement of low curiosity students, and (3) there is significant interaction between teaching stretegies and students’ curiosity on students’ reading comprehension achievement. An experimental research with factorial design 2x2 was used in this research. There were 120 students from 2012/2013 Academic Year of SMA BUDI AGUNG Medan as sample of this research. The result reveals that (1) students’ achievement in reading comprehension taught by using Problem-Based Learning stategy is higher than that of taught by using Reciprocal Teaching strategy, (2) reading comprehension achievement of high curiosity is higher than reading comprehension achievement of low curiosity, (3) there is signnificance interaction between teaching strategies and curiosity on students’ achievement in reading comprehension. After the Tukey test was applied, it showed that students have high curiosity got higher result if they were taught by using Problem-Based Learning strategy, and students have low curiosity got higher result if they taught by using Reciprocal Teaching strategy. Keywords: Reading comprehension, Problem-Based Learning, Reciprocal Teaching Curiosity
Classroom Discourse Structure in MTs Negeri Rantauprapat
Authors: Jupriaman Jupriaman , Murni Sri Minda 
Published: September 2020

The objectives of this study were to describe the classroom discourse structure, to describe how the classroom discourse is realized by teacher and students and the reasons for the realizations of the ways they are. The source of the data was English teacher and the students while the data are verbal and non verbal utterances of students and teachers. The instruments for collecting data were video tape recorder and researcher’s field note. The data were collected by observing and recording the utterances uttered by the teacher and students. The findings showed that the classroom discourse structures were dominantly realized by Initiation and Response (IR) structure. It was reflected in teacher direct, elicit and information exchanges was found that the classroom discourse structures. The other exchanges occur are boundary (framing and focusing move), directive, informing, check, accept, react, reply, nomination, marker, bid and conclusion acts. The reasons why the realization as the ways they are (1) teacher as a centre of interaction, (2) teacher gives some questions without any caring to the evaluation, appreciation and feedback without any feedback to make dialogue, (3) students have been disciplined not to speak in classes without a teacher’s direction, and most of them are unwilling to speak English. Keywords: Classroom Discourse Structures, Initiation and Response, Sinclair and Coulthard Theory
Speech Acts in Jokowi’s Campaign Speeches
Authors: Siregar Khairunnisa , Zainuddin Zainuddin 
Published: September 2020

The objectives of this study are to describe the types of speech acts used in Jokowi’s campaign speeches, to elaborate the realization of Jokowi used illocutionary act in campaign speeches, to know the reason of using illocutionary act. This study was conducted by descriptive qualitative research. The data of the research are the utterances of Jokowi’s speeches. The source of the data was Jokowi’s campaign speeches. The technique for collecting data is documentary technique. The technique of data analysis was interactive model by using Miles and Huberman. The findings show all types of speech acts were used in Jokowi’s campaign speeches, namely: locutionary act, illocutionary act can be classified into five parts; there were assertive, directive, commissive, expressive, declarative and the last types was perlocutionary act. The realization of illocutionary act used in Jokowi’s campaign speeches, the directive speech act was used in form of warning, commanding, promising, offering, questioning, requesting. The reasons of using illocutionary act in Jokowi’s campaign speeches are to point out or to identify what the speaker mean from his utterance, which influence of meaning and information of the speech and to get information clearly from Jokowi’s campaign speeches. Keywords: speech acts, campaign, campaign speeches
THE EFFECT OF TEACHING STRATEGIES AND CURIOSITY ON STUDENTS’ READING COMPREHENSION ACHIEVEMENT
Authors: Uziana Uziana , Sibarani Berlin , Pulungan Anni Holila 
Published: September 2020

The objectives of this research are to find out whether: 1) The students’ achievement in reading comprehension taught by using the Directed Reading Thinking Aactivity (DRTA) strategy was higher than taught by using the Questions-Answer Relationship (QARs) strategy. 2) The students’ achievement in reading comprehension with high curiosity was higher than that The students with low curiosity, and 3) there was interaction between teaching strategies and curiosity on The students’ achievement in reading comprehension. The population of this research was the students in grade XI of MAN Kampung (MAN KP) Teungoh Langsa in 2016/2017 school year. The total number of population of this research was 160 students. There were 6 classes. Two classes were chosen consist of 30 students of each class so 60 students were selected as sample of this research by applying multistage cluster random sampling. The research design was experimental research by using factorial design 2x2. The XI IPA2 class was taught by using Directed Reading Thinking Activity and XI IAI was taught by using Questions-Answer Relationship (QARs) Strategy. Curiosity questionnaire was conducted for classifying the students upon the high and low curiosity. Students’ achievement in reading comprehension was measured by using reading comprehension test. The data were analyzed by applying two-way analysis of variance (ANOVA) at the level of significant. The results of the data analysis proved that: 1) The students’ achievement in reading comprehension taught by Directed Reading Thinking Activity (DRTA) strategy is higher than students achievement in reading comprehension taught by Questions-Answer Relationship(QARs) Teaching strategy. 3) there was interaction between teaching strategies and curiosity on students’ achievement in reading comprehension.Keywords: Curiosity; Comprehension; Achievement; Teaching Strategies
COHORT-BASED GRAMMAR TEACHING MODEL DEVELOPMENT IN STRUCTURE SECTION OF TOEFL AT SEKOLAH TINGGI ILMU MANAJEMEN SUKMA MEDAN
Authors: Hidayat Hidayat , Gurning Busmin , Husein Rahmad 
Published: September 2020

This research makes use of Research and Development method in which a teaching model is developed to teaching grammar in the form of multiple-choice questions. It is Cohort-based Grammar Teaching Model that is developed. In the development of this teaching model, fifty students took part in. The research was conducted at Sekolah Tinggi Ilmu Manajemen Sukma Medan on jalan Sakti Lubis no. 80. To figure out what teaching model which the students need, questionaire was disseminated. In analyzing the available data from the instrument, questionaire inspired by Guttman Scale was made with numerous modifications in statements and questions.The analysis reveals that the participants require an intersting and fun grammar teaching model; easy to understand and more efective; quick problem-solving, time-saving and target-oriented. Due to this reason, eventually, Cohort-based Grammar Teaching Model is not mediocrewhere it is capable of alternating grammar problem for multiple-choice question in structure part of the TOEFL in a relative instant high result way.Keywords: Research and Development, Teaching Grammar, Multiple-choice question, Cohort
MANDAILING LANGUAGE MAINTENANCE IN KELURAHAN SUDIREJO II MEDAN
Authors: Zuri Nisma , Sumarsih Sumarsih , Setia Edy 
Published: September 2020

This study deals with Language Maintenance in Kelurahan Sudirejo II Medan. The objectives of the study are (1) to describe out the factors affecting Mandailing Languagein Kelurahan Sudirejo II Medan (2) to elaborate how Mandailingnese maintain the Mandailing Languagein Kelurahan Sudirejo II Medan, and (3) to reason for the manners or way by which they maintain Mandailing Languagein Kelurahan Sudirejo II Medan. The method of this study was descriptive qualitative research. The participants were twenty Mandailing people who live in Kelurahan Sudirejo II Medan. The data were taken from questionnaire and interview as instrument. Questionnaire was applied to collect the data about the factors affecting the Mandailing Language maintenane and strategies in maintaining ML. While the interview was applied to get data about the reason of Mandailing people maintain Mandailing Language. The data were analyzed by using Miles and Huberman matrix (1994). This research found the following results (1) There are seven factors affecting Mandailing Languagemaintenance in Kelurahan Sudirejo II Medan such as: Use of language in family (intermarriage and intermarriage), visiting homeland, use of the language in neighborhood domain, ethno linguistic vitality, living together in an area, use of the language in religion and practice of traditional ceremony. (2) to maintain Mandailing Language, the Mandailing people in Kelurahan Sudirejo II Medan conducted strategies like: Family language policy, using Mandailing Languagein daily life, using Mandailing Languagein social meeting or religious, using Mandailing Languagein cultural activity. (3) the reasons why the Mandailing people maintain the language are: they were proud being Mandailing people and speak Mandailing language and Mandailing Languageshows their identity as Mandailing people. Keywords: Language maintenance and Mandailing.
THE EFFECT OF TEACHING STRATEGIES AND SEL-EFFICACY ON STUDENTS’ ACHIEVEMENT IN READING COMPREHENSION
Authors: Sinaga Arthalina Romauli , Husein Rahmad , Murni Sri Minda 
Published: September 2020

The objective of this experimental research were to find out whether: (1) The students’ achievement in reading comprehension taught by using Annotation strategy was higher than that taught by using Compensation strategy, (2) the students’ achievement in reading comprehension with high self-efficacy was higher than that low self-efficacy, and (3) there was interaction between teaching strategies and self-efficacy on the students’ achievement in reading comprehension. The population of this research was the students in grade IX of SMP Negeri 18 Medan of 2016/2017 academic year. There were 52 students as samples of this research by applying cluster random sampling technique. The instruments of this research were reading comprehension test and questionaire sheet. The data were analyzed using ANOVA at the level of significant α = 0.05. The result of the data analysis proved that: (1) the students’ achievement in reading comprehension taught by using Annotation strategy was higher than that taught by using Compensation strategy, with Fobs (66.73) ˃ Ftab (4.10), (2) the students’ achievement in reading comprehension with high self-efficacy was higher than that with low self-efficacy, with Fobs (94.83) ˃ Ftab (4.10), (3) there was interaction between teaching strategies and self-efficacy, with Fobs (11.29) ˃ Ftab (4.10). Keywords: teaching strategies, self-efficacy, reading comprehension
THE SHIFT OF THEMES AND RHEMES IN THE TRANSLATION OF ENGLISH POLITICAL TEXTS INTO INDONESIAN
Authors: Astuti Widya , Husein Rahmad , Lubis Syahron 
Published: September 2020

This study was conducted to describe the shift of themes and rhemes in The Translation of English Political Text into Indonesian. In this research, descriptive qualitative design is applied by the researcher in order to answer the questions. The data were taken from English and Indonesia political news texts of Waspada. The technique used was interactive model by Miles, Huberman and Saldana (2014). This study found some enrichment with variation of theme and information structure of thematic and rhematic in English – Indonesia Waspada political texts. Based on analyzing data, the findings of this study are formulated : (1) There are some ways in which shifts applied in the thematic and rhematic in English - Indonesian translation of Waspada political texts there are such as : the SL which is differently translated into TL considering the grammatical pattern of both language and the unit of word constructing the theme and rheme and (2) There are some reasons for applying shifts in the thematic and rhematic shift in English – Indonesian translation of Waspada political texts such as different language system and grammatical structure from both English and Indonesia. Keywords: Translation Shifts, Theme, Rheme, Political, Text
LANGUAGE MAINTENANCE BY JAVANESE FAMILIES IN DESA SAMBIREJO TIMUR
Authors: Riadiani Ayu Utatri Prastica 
Published: September 2020

This study deals with language maintenance by Javanese families. It employs qualitative research design with case study. This study aims to find out: (1) the dominant factor affect f Javanese families language maintenance in Desa Sambirejo Timur, (2) the strategies used by Javanese families to maintain their ethnic language, and (3) the reason Javanese families maintained their language. The subjects were ten Javanese families including parents (the third generation) and children in Desa Sambirejo Timur. The instruments used for this study were observation and interview (in-depth interview). The observation was applied to get the data about the factor affect Javanese families’ language maintenance. The interview was applied to find the dominant factor affect language maintenance by Javanese families. The data was analyzed by using interactive model from Miles and Huberman’s. There are five factors being analyzed, namely: (1) attitude towards Javanese language, (2)value, (3) identity, (4) demography, and social factor. The dominant factor affect Javanese lang8uage maintenance in this study is the attitude towards language. Besides that there is one additional factor found during research namely visiting homeland. The strategy used by parents to maintained Javanese language in their family are: (1) raising Javanese language interest for children by direct them to arts, culture and literature about Javanese such as wayang, Javanese radio broadcasting, and Javanese song and (2) mix Javanese language with Indonesian when speaking to the children. Key Words : language maintenance, language attitude, family language maintenance, factors in language maintenance