bluuebunny/crossref_metadata_2025 huggingface dataset:
Accurate High Frequency Modelling of the Input Admittance of PWM Grid-Connected VSCs
Authors: Cvetanovic Ruzica , Petric Ivan , Mattavelli Paolo , Buso Simone
Published: February 2022

This paper addresses high frequency admittance
modelling of current-controlled voltage source converters (VSCs).
Recent studies have shown that harmonic instability may also
occur at frequencies above the Nyquist frequency. To form
an accurate multiple-frequency model in this frequency range,
sidebands that originate from modulation and sampling must
be examined. In this paper, an accurate small-signal model is
developed taking into account an adequate digital pulse-width
modulator (DPWM) representation, which allows to predict
dependence of the frequency response on the steady-state DC (SSDC) operating point. It is shown that, when center-pulse sampling
is implemented, PWM sidebands do not create additional loops
leaving only sampling sidebands to be considered. Using the same
approach as for SS-DC operation, a model which accurately represents admittance measurements during sinusoidal AC (S-AC)
operation is developed. Its basis is a novel DPWM model suitable
for S-AC regime, which allows to predict dependence of the VSC’s
input admittance on the grid voltage magnitude. Experimental
and simulated admittance measurements, performed on a single-phase two-level VSC during various SS-DC and S-AC regimes,
show an excellent match with the proposed models up to twice
the sampling frequency
Energy Consumption Model of BLDC Quadrotor UAVs for Mobile Communication Trajectory Planning
Authors: Li Mengtang , Jia Guoku , Gong Shiming , Guo Ruchi
Published: February 2022

This letter comprehensively presents a detailed quadrotor UAV energy consumption model established from the bottom of this system, i.e. the fundamental dynamics of the four BLDC motors, towards a trajectory based energy consumption calculation. The dynamics of a quadrotor and the influence of aerodynamics on thrust coefficient and torque coefficient are modelled as well. The simulation results show validity and feasibility, and are consistent with the classical helicopter theory, offering the community a promisingly handy tool to design UAV trajectories for mobile communication network designs.
Simulation of electrooptical measurements of prebreakdown electric fields in water. Part1. The electric field near the anode streamer
Authors: Yassinskiy Vladimir , Kuznetsova Yulia , Korobeynikov Sergey , Vagin Denis
Published: February 2022

The paper deals with the processing and analysis of the results of electro-optical studies of the pre-breakdown stage of an electric discharge in water using the Kerr effect. For this, the first chronogram was selected, obtained in the process of electro-optical chronographic research of water breakdown. In this work, it was possible to explain not only the features of the chronogram but also to obtain an estimate of the intensity of the appearance of the anode streamer in water E ~ 40-50 MV/cm. Using the method of computer simulation in the point-plane system near the anode point, the distributions of the electric field strength and the phase difference were constructed. The calculations were carried out both at a constant relative permittivity and its nonlinear dependence on the electric field strength. It turned out that dipole saturation is observed near the tip. As a result, the Kerr bands become denser and, at a spatial resolution of the recording equipment of 30 μm, in the pre-measuring zone, they are not recorded on the chronogram.
La Politica Economica dei Paesi in via di Sviluppo
Authors: Cornia Giovanni Andrea , Bertoli Simone , Bortolotti Luca , Martorano Bruno , Romano Donato , Sanfilippo Marco , Tiberti Luca , Ticci Elisa
Published: February 2022

This manual has been written to respond to the need of making available an exhaustive compilation in the Italian language of the main topics and problems of the political economy of development in poor countries. So far, a discussion of such topics in Italian has not been available. The drafting of this manual has benefitted from the teaching and research experience of several academics of the faculty of economics of the university of Florence. Part 1 focuses on key methodological approaches derived from the theory of collective choices. In turn, Part 2 discusses the orthodox and heterodox macroeconomic reforms applied in developing countries, and their problems. Part 3 illustrates the domestic policies that have been or should have been adopted in the field of food security, land reform, environmental sustainability, taxation, social spending, labor markets and population. Part 4 discusses then the domestic policy reforms in the field of international trade, foreign direct investments, capital flows and international migration. Last, Part 5 illustrates the historical experience of five policy regimes (i.e. the import substituting industrialization, redistributive approaches, the Asian Miracle, Washington Consensus, and Sustainable Development) that have been introduced in the non-socialist developing countries between the decolonization of the 1950s and the present time. The methodological approach followed in the manual starts from an evaluation of the real-life impact on growth, income distribution, the wellbeing of the population, and the environment of the policies adopted during each policy regime and in the main economic areas. Whenever the policy measures introduced in the past generated unsatisfactory results, the manual suggests possible alternatives inspired by the structuralist and Keynesian schools.
All-Ukrainian competition Library of the Year as a tool for disseminating innovative experience in library field
Authors: Soshynska Viktoriya , Dmytrenko Tetiana
Published: February 2022

The All-Ukrainian competition Library of the Year is considered as a tool for identifying and the widest implementation of library innovations. The organizational principles of holding the All-Ukrainian competition Library of the Year are analyzed on the basis of the competition conditions. The experience of holding competitions for the title of the best library abroad is presented: IFLA Public Library of the Year, Bibliothek des Jahres Deutschen Bibliotheksverband (Germany), Konkurs o nagrodę Marszałka Województwa Mazowieckiego Inspirująca Biblioteka Roku (Poland).
It is emphasized that modern Ukrainian librarians are already actively involved in the project activity, thereby achieving new quality of library products and services, attracting new users, forming a new image of the library. It is noted that not all best library practices receive publicity, support, and dissemination at the all-Ukrainian level, which diminishes the effect of introducing a progressive experience.
The authors of the article analyzed the innovativeness of the projects of the winners of the All-Ukrainian competition Library of the Year (2008—2019), as a result of which it was discovered the main directions of library innovations. They are: Development of library services based on project activity; Implementation of information technologies; Supporting education and self-development; Reading development; Library — community center; Valuable and professional orientation of youth; Creating a model for a new library.
Recommendations for dissemination and replication of implemented library innovations are provided. It was suggested to the organizers of the Contest to develop an especial communication plan and expand the interaction with the media. It is necessary to develop a particular proposal for partners and sponsors of the Contest, which will have good reputational consequences for business.
Beliefs of Moroccans Facing the COVID-19
Authors: Chaara A. , Laboudi F. , Belbachir S. , Ouanass A.
Published: February 2022

Despite all the information available on the severity of the virus, there are still people in denial and finding irrational descriptions to explain the Covid 19 pandemic. Indeed, from the start of first pandemics, men considered that it was inexplicable by medicine and only found its origin in the wrath of God, a belief that is still present today. Over the centuries, the perception of pandemics has gone through several stages. From the twentieth century, the conspiracy theory appears. The era of scientific thought and submission to a purely rational theory still clashes with other theories, even today. Any new epidemic brings its share of false beliefs, misconceptions and conspiracy theories. These push communities into hostile behavior that can put their own lives at risk. As for the coronavirus pandemic, it has sparked several interpretations in different cultures, all coming together in irrationality and without scientific basis. Through this work, we will describe and analyze the beliefs of Moroccans facing this pandemic, according to the most widespread theories trying to explain it, in particular scientific, religious, conspiracy and political theory, in order to find a link between these beliefs and different socio-demographic parameters.
“Etiological and Clinical Presentation of Headache Patients Attending at Border Guard Hospital, Dhaka, Bangladesh”
Authors: Yahia Major Ziauddin Mohammed , Khan Col. Mohammed Sarwar , Ahmmed Lt. Col. Salah Uddin , Hoq Md. Enamul , Bhuiyan Lt. Col. Anwar Parvez , Rashid Ruhi Tahshina
Published: February 2022

Background: Headache is a very common complain amongst patients attending inpatient and outpatient departments of Medicine and Neuromedicine. In this study an attempt has been made to evaluate the etiological and clinical pattern of headache in our populations. The results of the study will help prompt and early diagnosis of headache patients. Objective: To find out the Etiological and Clinical Presentation of Headache patients. Methods: This study was conducted in the Department of Medicine, Border Guard Hospital, Dhaka, Bangladesh from February to July-2020 (Six months study period). This is a prospective observational study. Sample size is 100. Qualitative purposive sampling has been done. Sample has been selected according to inclusion and exclusion criteria. Proper history taking, thorough physical examination and necessary investigation have been done to find out the etiology of headache. Results: In the study mean age of the respondents was 39.8±26.66 (at 95%CI). Male and female ratio was 0.72:1.This study revealed that out of 100 patients 60 patients had Tension type headache (TTH), 11 patients had migraine, 15 patients had mixed cranial headache (MCH), 1 patient to Cluster headache (CH) and 13 patients had secondary headache. It was seen that most patients (87%) suffered from primary headache with TTH being the commonest diagnosis. Females were more affected than male in all groups except secondary headache. There was decline in primary headache with advancing age as the number of secondary headaches increased. Investigations were needed in a very small group of patients. Conclusion: It is very important to differentiate the different types of headache. Knowledge about etiological pattern of headache will help clinically in prioritizing the patients, in planning investigations, early diagnosis and prompt management and prevent complications of the patients.
Assistance in Revitalizing the Field in Ngepungsari Village, Jatipuro District, Karanganyar Regency
Authors: Handoyo Suryo , Susila Herman , Mulyandari Erni
Published: February 2022

Assistance for the Revitalization of the Ngepungsari Village Field is carried out to assist the community in the Ngepungsari Village, Jatipuro District, Karanganyar Regency in terms of increasing economic income and tourism development by revitalizing the field into a tourist market. This development is done independently. The difficulty faced by the community in planning this field revitalization is how to make a good market design plan according to the needs and potential of the Ngepungsari community as well as a tourist destination in the village. With this market, it is hoped that the villagers' produce can be sold through the tourism market and at the same time it can attract both domestic and international tourists to Ngepungsari Village so as to increase the economic income of Ngepungsari villagers.
ANALISIS KADAR FENOLIK SEDUHAN KULIT BATANG KAYU JAWA (LANNEA COROMANDELICA) DAN RIMPANG JAHE EMPRIT (ZINGIBER OFFICINALE VAR. AMARUM) SERTA KOMBINASINYA
Authors: Isabela Masni , Nasrudin Nasrudin , Dali Arniah
Published: February 2022

Telah dilakukan penelitian dengan judul Analisis Kadar Fenolik Seduhan Kulit Batang Kayu Jawa (Lannea Coromandelica) dan Rimpang Jahe Emprit (Zingiber Officinale var. Amarum) Serta Kombinasinya”. Penelitian ini bertujuan untuk mengetahui total kadar fenolik pada kulit batang kayu jawa (KBKJ) tunggal dan rimpang jahe emprit (RJE) tunggal serta kombinasi kulit batang kayu jawa (KBKJ) dan rimpang jahe emprit (RJE) dengan perbandingan KBKJ:RJE (2:1; 1:1; 1:2). Penentuantotal kadar fenolik menggunakan metode Folin-Ciocalteu. Hasil penelitian pada seduhan kulit batang kayu jawa tunggalmenunjukkan total kadar fenolik paling tinggi sebesar 50,350 mg GAE/ gram sampel.
PENERAPAN MODEL PROBLEM BASED LEARNING UNTUK MENINGKATKAN HASIL BELAJAR SISWA KELAS XI MIA PADA MATERI LARUTAN PENYANGGA
Authors: Safitri Sitti Nur , Saefuddin Saefuddin , Maysara Maysara
Published: February 2022

Telah dilakukan penelitian Penerapan Model Problem Based Learning untuk Meningkatkan Hasil Belajar Siswa Kelas XI MIA pada Materi Larutan Penyangga. Penelitian ini bertujuan untuk mengetahui perbedaan peningkatan hasil belajar siswa yang diajarkan dengan penerapan model PBL jika dibandingkan dengan siswa yang diajarkan dengan menggunakan model pembelajaran langsung pada materi Larutan Penyangga. Penelitian ini dilakukan dengan metode kuasi eksperimen menggunakan Pretest-Posttest Control Group Design. Pemilihan sampel menggunakan teknik random sampling yaitu kelas XI MIA1 sebagai kelas eksperimen yang diajarkan dengan model PBL dan XI MIA2 sebagai kelas kontrol yang diajarkan dengan model pembelajaran langsung. Pada kedua kelas dilakukan pretest dan posttest menggunakan instrumen tes berbentuk pilihan ganda berjumlah 25 soal. Data keterlaksanaan PBL dan pembelajaran langsung dalam pembelajaran pada materi Larutan Penyangga diambil dengan menggunakan lembar observasi. Nilai rata-rata N-gain kelas eksperimen sebesar 0,69 sedangkan nilai rata-rata N-gain kelas kontrol 0,6. Pengujian hipotesis dilakukan dengan statistik non parametrik yaitu dengan menggunakan uji Mann-Whitney U, diperoleh  nilai Asymp sig. 0,001 < α = 0,05, sehingga H0 ditolak dan H1 diterima. Artinya,  hasil belajar siswa yang diajarkan menggunakan model PBL lebih baik secara signifikan dibandingkan dengan hasil belajar siswa  yang diajarkan  dengan menggunakan  model pembelajaran langsung.
PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH UNTUK MENINGKATKAN HASIL BELAJAR KIMIA SISWA KELAS X PADA POKOK BAHASAN LARUTAN ELEKTROLIT DAN NONELEKTROLIT
Authors: Selfi Dian , Tewa Yuniati , Maysara Maysara
Published: February 2022

Penelitian ini bertujuan untuk mengetahui peningkatan hasil belajar siswa kelas X pada siswa SMAN 1 Talaga Raya setelah diajar menggunakan model pembelajaran berbasis masalah serta peningkatan aktivitas belajar siswa kelas dengan penerapan Model Pembelajaran Berbasis Masalah pada pokok bahasan larutan elektrolit dan non elektrolit. Penelitian ini adalah penelitian tindakan kelas yang terdiri dari dua siklus, dimana masing-masing siklus terdiri dari tahapan: (1) perencanaan; (2) pelaksanaan tindakan; (3) observasi dan evaluasi; (4) refleksi. Hasil penelitian menunjukkan bahwa penerapan model berbasis masalah yaitu (1)  dapat meningkatkan hasil belajar siswa kelas X di SMAN 1 Talaga Raya pada Pokok Bahasan Larutan Elektrolit dan Non Elektrolit  dengan nilai belajar siswa secara klasikal yaitu 61,1 dengan presentse ketuntasan 28,57% pada siklus I dan mengalami peningkatan pada siklus II menjadi 80,6 dengan presentase ketuntasan 89,28%. (2) aktivitas belajar siswa terjadi peningkatan dari 64% dengan kategori sedang pada siklus I menjadi 75% dengan kategori baik pada siklus II. Sedangkan aktivitas mengajar guru pada siklus I sebesar 68% meningkat pada siklus II sebesar 86%.Penelitian ini dapat disimpulkan bahwa penerapan model Pembelajaran Berbasis Masalah dapat meningkatkan hasil belajar kimia siswa Kelas X SMAN I Talaga raya  pada pokok bahasan Larutan Elektrolit dan Non Elektrolit
Analisis Penerapan Kurikulum 2013 Ditinjau dari Standar Proses dalam Pembelajaran Kimia Kelas X di SMA Negeri 1 Tomia
Authors: Dewi Wa Ode Rosmala , Ratna Ratna , Marhadi Muhammad Ali
Published: February 2022

Penelitian ini bertujuan untuk mengetahui Rencana Pelaksanaan Pembelajaran (RPP) yang digunakan SMA Negeri 1 Tomia jika ditinjau dari standar proses kurikulum 2013, untuk mengetahui pelaksanaan pembelajaran kimia di SMA Negeri 1 Tomia jika ditinjau dari standar proses kurikulum 2013, dan untuk mengetahui kendala yang dialami oleh guru di SMA Negeri 1 Tomia dalam merancang dan melaksanakan pembelajaran yang sesuai dengan kurikulum 2013. Penelitian ini dilaksanakan pada semester Genap Tahun Ajaran 2019/2020.Penelitian ini merupakan deskriptif kualitatif. Penelitian ini menganalisis Rencana Pelaksanaan Pembelajaran (RPP) yang disusun oleh guru kimia kelas X serta pelaksanaan pembelajaran Kimia di kelas X IPA 1, X IPA 2 dan X IPA 3. Teknik pengumpulan data meliputi observasi, wawancara dan dokumentasi.Teknik analisis data meliputi reduksi data, penyajian data dan verifikasi data. Hasil analisis menunjukkan secara umum RPP yang disusun guru telah memenuhi sebagaian besar indikator dalam Permendikbud No. 22 Tahun 2016 tentang standar proses. RPP yang disusun guru Kimia SMA Negeri 1 Tomia telah memenuhi ketercapaian dengan kriteria baik. Pelaksanaan kurikulum 2013 dalam pembelajaran Kimia kelas X di SMA Negeri 1 Tomia telah terlaksana dengan kriteria baik.Kendala yang dialami guru dalam merancang dan melaksanakan pembelajaran adalah penyesuaian dengan karakater siswa, merencanakan pembelajaran yang dapat membuat siswa mampu menemukan sendiri konsep materi dan kurangnya sumber belajar serta tidak semua siswa ikut terlibat dalam pembelajaran.
PENGEMBANGAN PERANGKAT RENCANA PELAKSANAAN PEMBELAJARAN KIMIA MENGGUNAKAN KURIKULUM 2013 PADA POKOK BAHASAN IKATAN KIMIA DAN BENTUK MOLEKUL
Authors: Kamil Nursahida , Haeruddin Haeruddin , Maysara Maysara
Published: February 2022

Telah dilakukan penelitian Pengembangan Perangkat Rencana Pelaksanaan Pembelajaran (RPP) Kimia menggunakan Kurikulum 2013 pada Pokok Bahasan Ikatan Kimia dan Bentuk Molekul Kelas X MIPA SMA Negeri 5 Kendari. Penelitian ini bertujuan untuk menghasilkan perangkat Rencana Pelaksanaan Pembelajaran (RPP) kimia pada pokok bahasan ikatan kimia dan bentuk molekul yang layak digunakan berdasarkan kurikulum 2013. Metode yang digunakan dalam penelitian ini adalah Research and Development (R&D) yang dikembangkan oleh Sivasailam Thiagarajan. Pengembangan perangkat Rencana Pelaksanaan Pembelajaran (RPP) pada penelitian ini menggunakan model 4-D yaitu pendefenisian (define), perancangan (design), pengembangan (development), dan penyebaran (dessiminate). Pada penelitian ini hanya dilakukan sampai pada tahap pengembangan. Langkah-langkah dalam penelitian pengembangan ini yaitu pada tahap pendefenisian terdiri atas analisis awal-akhir, analisis siswa, analisis tugas, analisis konsep, dan perumusan tujuan pembelajaran. Pada tahap perancangan terdiri atas  pemilihan media pembelajaran, pemilihan format, dan rancangan awal. Pada tahap pengembangan terdiri atas validasi ahli. Hasil penelitian menunjukkan bahwa produk RPP yang dikembangkan divalidasi oleh 4 orang penilai dengan menggunakan lembar validasi dan memperoleh nilai sebesar 98% dan tergolong dalam kategori sangat baik.
ANALISIS KESALAHAN DALAM MENYELESAIKAN SOAL-SOAL OPERASI BENTUK ALJABAR PADA SISWA KELAS VIII SMP NEGERI 5 KENDARI
Authors: Rusmiati Santi , Dangga Sriwati
Published: February 2022

Penelitian ini bertujuan untuk mengetahui kesalahan yang dilakukan siswa dalam menyelesaikan soal bentuk aljabar, untuk mengetahui penyebab-penyebab siswa melakukan kesalahan dalam menyelesaikan soal bentuk aljabar. Jenis Penelitian ini adalah deskriptif kualitatif. Subjek penelitian dipilih berdasarkan hasil analisis dan data tes sebanyak 30 orang siswa. Hasil analisis data tes digunakan sebagai dasar pemilihan subjek wawancara dan dipilih 4 orang siswa. Analisis data dilakukan melalui langkah-langkah menelaah seluruh data, reduksi data, penyajian data, dan verifikasi data. Data hasil wawancara digunakan sebagai pembanding data hasil tes untuk mengetahui penyebab siswa melakukan kesalahan. Kesimpulan yang diperoleh dari penelitian ini adalah: Jenis kesalahan yang dilakukan siswa kelas VIIID SMP Negeri 5 kendari dalam menyelesaikan soal operasi aljabar adalah kesalahan fakta, kesalahan konsep, kesalahan prinsip dan kesalahan prosedural, Faktor-faktor yang menyebabkan siswa melakukan kesalahan dalam menyelesaikan soal operasi aljabar yaitu siswa tidak memahami soal dengan baik, sehingga siswa tidak dapat menerjemahkan suatu permasalahan kedalam model matematika.
EFEKTIVITAS PENDEKATAN PEMBELAJARAN MATEMATIKA REALISTIK TERHADAP KEMAMPUAN PENALARAN MATEMATIS SISWA KELAS VIII SMP NEGERI 10 KENDARI
Authors: Hendrik Hendrik , Hasnawati Hasnawati , Saleh Saleh
Published: February 2022

Penelitian ini  bertujuan untuk: Mengetahui efektivitas pendekatan pembelajaran matematika realistik terhadap kemampuan penalaran matematis siswa kelas VIII SMP Negeri 10 Kendari. Populasi dalam penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 10 Kendari yang terdiri dari 6 kelas paralel yaitu VIII1 – VIII6. Teknik pengambilan sampel menggunakan teknik Simple Random Sampling. Penentuan kelas eksperimen dilakukan secara random dan diperoleh kelas VIII1 sebagai kelas eksperimen dan kelas VIII5 sebagai kelas kontrol. Teknik pengumpulan data dilakukan dengan pemberian instrumen penelitian berupa lembar observasi, angket respon siswa dan tes kemampuan penalaran matematis siswa berbentuk tes uraian. Teknik analisis data menggunakan statistik deskriptif dan statistik inferensial. Berdasarkan hasil penelitian diperoleh bahwa pendekatan pembelajaran Matematika Realistik efektif terhadap kemampuan penalaran matematis siswa kelas VIII SMP Negeri 10 Kendari. Uji hipotesis menunjukkan pendekatan pembelajaran matematika realistik secara signifikan lebih efektif terhadap kemampuan penalaran matematis siswa kelas VIII SMP Negeri 10 Kendari dibandingkan pendekatan saintifik
DESKRIPSI HASIL BELAJAR MATEMATIKA PESERTA DIDIK KELAS VIII SMP NEGERI 19 KENDARI DENGAN MENGGUNAKAN MEDIA GOOGLE CLASSROOM
Authors: Susanto Pebi Tri , Anggo Mustamin , Samparadja Hafiludin
Published: February 2022

Penelitian ini bertujuan untuk mengetahui : (1) respon peserta didik kelas VIII SMP Negeri 19 Kendari dengan menggunakan google classroom, (2)Pembelajaran online matematika peserta didik kelas VIII SMP Negeri 19 Kendari yang diajar dengan menggunakan google classroom, (3) Hasil belajar matematika peserta didik kelas VIII SMP Negeri 19 Kendari yang diajar  menggunakan mediagoogle classroom. Jenis penelitian ini adalah penelitian deskriptif dengan perolehan data menggunakan data kuantitatif. Penelitian ini dilaksanakan di SMP Negeri 19 Kendaritepatnya bulan desember tahun ajaran 2020/2021. Sampel penelitian terdiri dari 3 kelas dengan jumlah 68 orang. Teknik analisis data menggunakam analisis deskriptif. Hasil penelitian yang diperoleh adalah tentang: (1) respon peserta didik SMP Negeri 19 Kendari kelas VIII (2) Pembelajaran matematika online dengan menggunakan media google classroom di SMP Negeri 19 Kendari sebelum jam pembelajaran dimulai guru tersebut mengingatkan masing-masing kelas bahwa pembelajaran akan dimulai. (3) Deskripsi hasil belajar matematika peserta didik dengan menggunakan pembelajaran online google classroom.
HUBUNGAN MINAT BELAJAR TERHADAP HASIL BELAJAR METEMATIKA SISWA KELAS XI SMA NEGERI 1 LADONGI
Authors: Murtini Murtini , Artika Gusti
Published: February 2022

Penelitian ini adalah penelitian ex post facto yang bertujuan untuk melihat apakah ada hubungan antara minat belajar dengan hasil belajar siswa kelas XI SMA Negeri 1 Ladongi.Populasi dalam penelitian ini adalah seluruh siswa kelas XI SMA Negeri 1 Ladongi tahun pelajaran 2020/2021 yang tersebar dalam 7 kelas. Penentuan sampel dilakukan dengan teknik proportional random samplingdengan cara memilih sembilan siswa dari setiap kelas sebagai sampel penelitian. Teknik pengumpulan data menggunakan angket minat belajar dan dokumentasi untuk data hasil belajar matematika. Secara deskripsif diperoleh siswa yang minat belajarnya baik sebanyak 52 siswa atau 82,54%, siswa yang minat belajarnya kurang  sebanyak 11 siswa atau 17,46%, siswa yang hasil belajar matematikanya baik sebesar 59 siswa atau 93,66% dan siswa yang hasil belajar matematikanya kurang sebesar 4 siswa atau 6,34%. Secara inferensial diperoleh terdapat hubungan yang positif dan signifikan antara minat belajar dengan hasil belajar matematika siswa kelas XI SMA Negeri 1 Ladongi.
De héroes, compromiso y política. Una relectura de la novela Mamita Yunai, de Carlos Luis Fallas desde la autoficción
Authors: Blanco Ramos Roberto , Fallas Monge María Fernanda
Published: February 2022

El presente artículo pretende elaborar una relectura de la novela Mamita Yunai, del escritor costarricense Carlos Luis Fallas, publicada en 1941, desde los planteamientos literarios y teóricos de la autoficción. Para ello se analizan los principales mecanismos autoficcionales utilizados por el narrador y se examinan los vínculos existentes entre la literatura de compromiso sociopolítico, la cual postula una estrategia de divulgación y concientización social, y la correlación con las estrategias de la autoficción, destacando la formación de una identidad literaria de corte comunista-proletario. La importancia de realizar este estudio radica en el hecho de que, hasta el momento, no existe ninguna investigación que haya abordado la novela desde un acercamiento autoficcional. Además, el análisis procura plantear la obra como un antecedente de la formulación del debate teórico de la autoficción, surgido en 1977, con la creación del neologismo “autoficción”, acuñado por Serge Doubrovsky.
Analysis of the Influence of Product Quality, Promotion, and Brand Image on the Purchase Decision of Honda Brand Motorcycles
Authors: Adi Tony Margiyanto , Muzdalifah Muzdalifah , Gayatri Askardiya Mirza
Published: February 2022

The development of the motorcycle business, especially in the country, has recently experienced a fairly high increase. Business competition in this field is automatically getting tougher. Purchasing decisions are an important element in maintaining and growing the company. The purpose of this study was to determine the effect of product quality, promotion and brand image on purchasing decisions for Honda motorcycles in regular class students, either partially or simultaneously. The method used is the analysis of validity and reliability, multiple linear regression equation, correlation, and hypothesis testing (t test and F test) and the coefficient of determination. The study population is classified into a limited population (finite), for a known amount of certainty, a population of about 500 respondents / students. Using the Slovin formula, a sample of 83 respondents was obtained. By using the computer assistance program SPSS for Windows 22.00, the equation of the multiple linear regression line is obtained as follows: Purchase Decision (Y) = 0.258 + 0.255 Product Quality + 0.238 Promotion + 0.598 Brand Image. The relationship between product quality and purchasing decisions is 0.586 quite strong and unidirectional, the relationship between promotions and purchasing decisions is 0.497 strong and unidirectional, and the relationship between brand image and purchasing decisions is 0.597, strong and unidirectional. From the results of the research, the coefficient of determination shows that product quality, promotion and brand image combined on the purchase decision of Honda brand motorcycles is 51.9% while the remaining 48.1% (100% - 51.9%) is influenced by other factors originating from outside this regression model. For example the perception of price, service quality, place or location and others.
The Existence of the Pulpit of the Historic Jakarta Mosque
Authors: Irfan Ahmad , Bahrudin Nurbaiti , Rosadi Nicky
Published: February 2022

The pulpit which existed at the time of the Prophet, then it became a sunnah that was respected, so that in generations after the Prophet the existence of the pulpit was still maintained. This study attempts to describe the existence of the pulpit at a historic mosque in Jakarta. This research uses a qualitative research approach with analytical descriptive method. The research location takes place in historic mosques in Jakarta. Data collection techniques using interviews, observation, documentation. The results of this study indicate that historic Jakarta mosques still use pulpits with various models so that their existence is still maintained today.
Klasifikasi Tingkat Kepuasan Pengguna dengan Menggunakan Metode K-Nearest Neighbour (KNN)
Authors: Diansyah Surya
Published: February 2022

Pekanbaru is one of the largest cities in Riau Province which is known as a civil city. Pekanbaru is also a city with a fairly high density of vehicles and causes a higher level of congestion. A sustainable transportation system can be a solution to current transportation problems and public transportation itself plays a role in providing effective and efficient transportation facilities for the community. The purpose of classifying the level of satisfaction of Trans Metro Pekanbaru bus users is to obtain knowledge and rules for the satisfaction level of Trans Metro Pekanbaru bus passenger services. The data processed in this study were 170 datasets sourced from questionnaires given to Trans Metro Pekanbaru bus passengers. Based on the data collection, what is done first is to find the optimal k value using the k-Fold Cross Validation method, while to find the classification of the level of service satisfaction of bus users using the K-Nearest Neighbor method. The results of the classification of the level of satisfaction of bus users using the k-nearest neighbor method are as many as 0 people who are very satisfied, 5 people are satisfied and 0 people are not satisfied with the services provided. Meanwhile, the accuracy level generated based on the test results has an accuracy rate of 94.12% with the optimal k value is k = 5. The results of this classification can be used as a reference for Trans Metro Pekanbaru buses for policies in Pekanbaru Trans Metro bus services.
INTERNATIONALIZATION AS A STRATEGIC DIMENSION FOR THE DEVELOPMENT OF ACADEMIC INSTITUTIONS
Authors: Kremen Vasyl , Kurbatov Sergiy
Published: February 2022

The paper is devoted to the analyses of specific features of internationalization of academic research institutions, first of all at National Academy of Educational Sciences (NAES) of Ukraine. We conducted a brief observation of contemporary English language literature in the area of internationalization of academic institutions and evaluation of its effectiveness. We tried to analyze the situation with internationalization at academic institutions in situation of limited financial support and restrictions, connected with pandemic situation with COVID-19. Special stress was made on elaboration and implementation of successful strategy of internationalization with realistic, accurate and measurable dimensions of internationalization. Using as an example the Strategy of Internationalization of NAES of Ukraine, which was approved by the Presidium of NAES of Ukraine on March, 18, 2021, we observed the main dimensions of internationalization with the relevant indicators, which could be implemented in other academic institutions in Ukraine. Also, we compare some of these indicators with the indicators of internationalization at leading international university rankings (QS and THE).
THE DEPARTMENT OF COMPARATIVE EDUCATION OF THE INSTITUTE OF PEDAGOGY OF THE NATIONAL ACADEMY OF EDUCATIONAL SCIENCES OF UKRAINE: RETHINKING MISSION UNDER MODERN TRANSFORMATIONS
Authors: Lokshyna Olena
Published: February 2022

In the paper the research results of the Department of Comparative Education of the Institute of Pedagogy of the National Academy of Educational Sciences of Ukraine in the framework of the research project “Trends in school education in the EU, USA and China” (2018–2020) analysed. The scientific-auxiliary bibliographic indexes of the published works and the final reports on the scientific activity of the Department were used as information sources. The author found the increase in number and expansion of types of the published works within the 2018-2020 research project in comparison with the previous ones (2012–2014 and 2015–2017) (0118U003360). Based on the results of the analysis the author came to the conclusion that such a transformation was caused by the demands of the national education (launch of the secondary education reform “New Ukrainian School” in 2017/2018 academic year; introduction of training component into the doctoral education within the Bologna process that actualizes the development of textbooks/instruction materials) and new societal challenges (COVID-19 pandemic). The author draws attention to the importance of constant rethinking of the comparative education mission to meet the needs of the national education. Priorities in these conditions are: synergy with the context, openness to change, quick response, flexibility of the essence and format of the research, innovative ideas, practical orientation of the results.
RESEARCHES OF RUSSIAN ETHNOGRAPHERS ON THE WEDDING CEREMONIES OF THE OASIS OF BUKHARA
Authors:   Bukhara State University, Teacher Of The Department ", Shamsieva Zilola ,   History Of Bukhara",   , Uzbekistan
Published: February 2022

The article is devoted to the analysis of the traditions associated with the wedding ceremonies of Bukharian people and the role of these ceremonies in the life of the nation. Given article also provides information on comments of particular researchers on various traditions of the wedding ceremony held in Bukhara in the second half of 20th century.
TEACHING MOLECULAR PHYSICS WITH PROBLEM SOLVING
Authors:   Assistant Teacher of Tashkent University of Information Technologies named after Muhammad al-Khorezmiy, Uzbekistan, Absalyamova IlmiraI ldarovna
Published: February 2022

This article provides with some of the tasks and goals of molecular physics as a subject and shows several examples of problems solved in molecular physics, and methods for solving them. Here are some ways to solve each problem in several ways.
PUBLIC OPINION AND GOVERNMENT EVALUATION IN NEW UZBEKISTAN
Authors:   Professor of the Department of Social Sciences Doctor of Law, Tashkent State Transport University, Uzbekistan, Dadasheva Akida Abduzhabbarovna
Published: February 2022

This article takes into account the current policy of the Republic of Uzbekistan, the positions and views of citizens on reforms, contacts and dialogue with the authorities. The importance of transparent data generation is recognized. The opinions of great scientists have been recorded and adapted to the present day.
Subdivision of Precambrian time - methods and terminology currently used by Danish geologists
Authors: Bridgwater D. , Pulvertaft T. C. R.
Published: February 2022

A meeting was called on October 29-30, 1981 under the auspices of the Danish National Com- mittee for Geology to discuss current Danish practises in the subdivision of the Precambrian with Professor K. Rankama, Helsinki, who was visiting Copenhagen at this time....
In memoriam Hans Frebold 1899-1983
Authors: Teichert Curt
Published: February 2022

Hans Frebold was born in Hannover, Germany. 011 31 July 1899 and died in Ottawa, Canada, 011 2 June 1983. He had been a member of Dansk Geologisk Foreni11g for nearly 50 years....
ACTIVIDAD ANTIINFLAMATORIA Y ANTIOXIDANTE DE TRES VARIEDADES DE Opuntia ficus-indica “TUNA”
Authors: Enciso Roca Edwin Carlos , Aguilar Felices Enrique Javier , Común Ventura Pablo Williams , Tinco Jay Johnny Aldo
Published: February 2022

Se determinó la actividad antiinflamatoria y antioxidante del extracto hidroalcohólico de fruto de las variedades anaranjada, morada y blanca de Opuntia ficus-indica. Los métodos fueron: fenoles totales por Folin-Ciocalteu, flavonoides por cloruro de aluminio y la actividad antioxidante por DPPH, ABTS y FRAP; y la actividad antiinflamatoria in vitro por estabilización de membrana de glóbulos rojos. El contenido de fenoles totales fue 4,08, 3,87 y 3,69 mg EAG/g de extracto para las variedades anaranjada, blanca y morada, respectivamente (p>0,05); el de flavonoides fue mayor en la variedad anaranjada (2,36 mg EQ/g), seguida dela variedad morada (2,29 mg EQ/g) y blanca (2,0 mg EQ/g) (p<0,05), respectivamente. La capacidad secuestradora de radical libre DPPH de la variedad anaranjada presentó mayor actividad (6,20 μmol ET/g) (p<0,05), para ABTS la variedad morada presentó mayor actividad (25,35 μmol ET/g) (p<0,05) y para el potencial antioxidante reductor del hierro (FRAP), las tres variedades presentaron valores similares (p>0,05). El porcentaje de actividad antiinflamatoria in vitro, fueron para la variedad anaranjada (60,32%), morada (51,37%) y blanca (36,01%), respectivamente, mostrando menor actividad, frente a dexametasona(87,93%) y diclofenaco (84,60%) (p<0,05). Se concluye que la pulpa de los frutos de las tres variedades tienen actividad antioxidante y antiinflamatoria.
EVALUACIÓN DE LA ACTIVIDAD SINÉRGICA ENTRE QUITOSANO DE PLUMA DE POTA (DOSIDICUS GIGAS) Y ÁCIDO CÍTRICO EN EL PARDEAMIENTO DE LA PULPA DE CHIRIMOYA (Annona Cherimola MILL.)
Authors: Quispe Fredy , Villa Yanina , Bravo Noemí , Castro Olivio , Santiago Julio , Guerrero Marco
Published: February 2022

El estudio de investigación consistió en tres etapas: primero obtener y caracterizar al quitosano extraído a partir de la pluma de pota, segundo seleccionar la variedad de chirimoya apropiada en función al rendimiento del fruto y tercero estudiar el efecto sinérgico entre el quitosano y ácido cítrico en el control del pardeamiento enzimático de la pulpa de chirimoya. En la caracterización del quitosano se obtuvo un valor de 846 kDa de peso molecular y 78,2% del grado de desacetilación. Empleando un Diseño Completamente al Azar (DCA) se evaluó tres variedades de chirimoya (Lisa, Impresa y Umbonata) seleccionando la variedad Lisa por el mayor rendimiento en pulpa; luego se empleó un Diseño de Bloques Completamente al Azar (DBCA) evaluando cuatro tratamientos (T) por triplicado en la pulpa estandarizada, el cuarto tratamiento (0,75% quitosano + 3% ácido cítrico) presentó la menor actividad de la polifenoloxidasa (70,80 unidades de PPO/min x g de muestra) y ralentizó la oxidación del contenido de polifenoles totales (28 mg de ácido gálico/100 g en peso de pulpa fresca) durante la evaluación. La proyección de vida útil en la pulpa se obtuvo empleando la ecuación de Arrhenius y la variación de color, presentando el cuarto tratamiento el mayor tiempo (254 días), evidencia de un efecto sinérgico que contribuye a retrasar el pardeamiento enzimático en la pulpa de la chirimoya.
METALES DE VALOR AÑADIDO EN LOS RÍOS SALADO UBICADOS EN LAS CUENCAS SAMA Y LOCUMBA (REGIÓN DE TACNA - PERÚ) Y SU CORRELACIÓN CON ARSÉNICO Y BORO
Authors: Avendaño Cáceres Edgardo , Briceño Toledo Margarita , Cornejo Ponce Lorena , Morales Cabrera Dante , Ward Neil I.
Published: February 2022

Los objetivos de la presente investigación fueron identificar y cuantificar metales con valor añadido potencialmente comercializables de ser recuperados o extraídos en dos ríos denominados Salado; uno ubicado en la cuenca hidrográfica de Locumba (Salado-Locumba) y el otro en la cuenca hidrográfica de Sama (Salado-Sama). Además, realizar un análisis de correlación de los contenidos de arsénico (As) y boro (B) presentes en 14 puntos de muestreo ubicados en diferentes fuentes de agua a lo largo de las dos cuencas. Se analizaron 49 elementos utilizando ICP-MS, en muestras de agua para determinar metales totales y disueltos. En los análisis de correlación, asociación y reducción de variables se aplicaron métodos estadísticos robustos. Los metales de valor añadido identificados fueron: Li, Rb, Cs y Ge en concentraciones de 1,818±0,415 mg/L, 0,248±0,048 mg/L, 0,361±0,104 mg/L y 0,005±0,002 mg/L en el río Salado-Locumba y 1,950±0,544 mg/L, 0,343±0,090 mg/L, 0,401±0,096 mg/L y 0,005±0,002 mg/L en el río Salado-Sama, respectivamente. Se determinó que la correlación entre las concentraciones de los elementos químicos de valor añadido Li, Rb, Cs y los elementos As y B presentes en 14 puntos de muestreo ubicados en diferentes fuentes de agua a lo largo de las dos cuencas, son estadísticamente significativos, positivos y altos (r>0,7 y p<0,01).
ПЕРСПЕКТИВЫ ИСПОЛЬЗОВАНИЯ ПРИРОДНОГО ГАЗА В КАЧЕСТВЕ МОТОРНОГО ТОПЛИВА
Authors:   директор департамента корпоративного развития и управления активами, и.о. председателя правления ОЮЛ «Газомоторная ассоциация Казахстана», https://orcid.org/0000-0002- 4926-5208, Арыстанбаев Т.С. , Аширов А.С. ,   генеральный директор (председатель правления), https://orcid.org/0000-0002- 7972-5287, Тохтаров Е.К. ,   заместитель председателя НТС, исполнительный директор ОЮЛ «Газомоторная ассоциация Казахстана», https://orcid.org/0000-0002- 6276-9152
Published: February 2022

Рассматриваются проблемы развития рынка природного газа (метан) в качестве моторного топлива в Республике Казахстан для обеспечения национальных и международных транзитных автоперевозчиков сжиженным и компримированным природным газом (СПГ/КПГ). В статье сделан анализ выполнения стратегии развития рынка газомоторного топлива (ГМТ) в РК, описание его технологических, экологических и экономических характеристик и преимуществ по сравнению с традиционными видами моторного топлива, исследуются основные задачи и риски по строительству производственно-сбытовой инфраструктуры СПГ/КПГ на «Международном транспортном маршруте «Европа-Китай» (МТМ Е-К). Акцентируется внимание на актуальной необходимости проведения исследования текущей и прогнозной интенсивности движения газомоторной техники по МТМ Е-К, совершенствования нормативных документов, регулирующих эти транзитные потоки, даны предложения по механизму их формирования, оптимизации структуры рынка ГМТ в РК. В этих целях обосновываются первоочередные задачи по проведению научно-технических, экономических и экологических исследований в данной сфере, необходимых для задействования механизма расширения транзита газомоторного потока на МТМ Е-К, расчета социально-экономических эффектов для экономики РК, подтверждающих соответствие рассматриваемых задач по газификации МТМ Е-К международным инициативам «Один пояс - один путь» и целям плана сотрудничества по сопряжению Новой экономической политики «Нұрлы Жол» и строительства "Экономического пояса Шелкового пути".
Natural Dyes Utilization and Production Technology for Dye-Sensitized Solar Cell
Authors: Adhi Kusumastuti  , Samsudin Anis  , Monna Rozana
Published: February 2022

Dye-sensitized solar cell (DSSC) provides high ability of renewable energy generation. One of the main factors affects the performance of DSSC is the type of dye applied as a sensitizer. Natural sensitizers have become a major concern due to the widely availability in the world and environmentally friendly characteristic. However, the need to improve the natural dyes based DSSC performance is very important. This review was conducted to present the recent studies in natural dyes utilization and performance for DSSC application. The short overview of DSSC is also provided. In addition, alternative natural dyes in the form of powder, process and production technology with their strengths and the weaknesses are also discussed.
Optimisation of H-Darrieus VAWT Solidity for Energy Extraction in Cooling Tower Exhaust Systems
Authors: Enderaaj Singh  , Sukanta Roy  , Yam Ke San  , Law Ming Chiat
Published: February 2022

The technologies surrounding renewable energy have been receiving surmountable attention to producing clean energy and reducing the dependency on depleting fossil fuel sources. In this context, research investigations on vertical axis wind turbines (VAWT) in free stream flow condition has been extensively conducted to improve the energy extraction efficiency from the wind. VAWTs are particularly advantageous in locations not suitable for conventional horizontal axis wind turbines (HAWT). However, the applications of VAWTs are still limited due to their lower performances compared to their counterparts. Furthermore, the wind energy extraction problem is more prominent in urban areas with unpredictable and inadequate wind speed conditions. The present study focuses on an alternative way to harness wind energy from unnatural sources such as cooling tower exhaust systems with the reliable and consistent exhaust air. A three-dimensional numerical study has been conducted to investigate the performance of a 3-bladed H-Darrieus wind turbine (HDWT) using S-1046 airfoils of four different solidities under accelerated wind conditions of a cooling tower. The HDWT model is positioned at the cooling tower outlet, where it rotates using sliding mesh to measure the power output. Shear stress transport (SST) k- turbulence model solver was used to solve the implicit unsteady Reynolds-Averaged Navier-Stokes equations. It is observed that the higher solidity HDWT reached peak power coefficient at a lower tip speed ratio (TSR). In contrast, lower solidity HDWT achieved peak power coefficient at higher TSR. The higher solidity 0.375 and 0.450 produced a maximum power coefficient of 0.233 at TSR of 2.0.
Wind Resource Assessment by Analyzation and Simulation in WAsP for Electricity Generation in Chiang Mai, Thailand
Authors: Tariq Khan  , Juntakan Taweekun  , Thanansak Theppaya
Published: February 2022

The purpose of this study is to assess and analyse the potential wind energy in Chiang Mai, the northern province of Thailand. The calculation in this paper is based on ten-minutes interval data at 10m height recorded for three years data from 2017 to 2019 at Thai meteorological station, Thailand. Weibull model is applied to evaluate the wind distribution by utilizing wind atlas analysis and application program (WAsP). Meanwhile, the average wind speed and the average power density was recorded at 1.48 m/s and 15 W/m2. The prominent wind direction is from the south west to north east. The two potential sites showed the maximum annual energy production 1401.419 MWh and 1913.410 MWh by using Bonus 300kW Mk III wind turbine with LCOE $382.64 / MWh and $274.63 / MWh respectively. This paper suggests the suitable sites for the electricity generation in Chiang Mai. Hence, it will not only reduce the stress on conventional methods but also create awareness regarding the potential of wind energy.
Stability Analysis of The Stagnation-Point Flow and Heat Transfer Over a Shrinking Sheet in Nanofluid in The Presence of MHD and Thermal Radiation
Authors: Nurul Syuhada Ismail  , Yong Faezah Rahim  , Norihan Md Arifin  , Roslinda Nazar  , Norfifah Bachok
Published: February 2022

Recent developments in the field of fluid dynamics have led to a new interest in stability analysis. The numerical solution obtained from the problems of the flow at the stagnation point, as well as the heat transfer with MHD and thermal radiation effects over a shrinking sheet, is used to carry out a stability analysis. The flow of this problem is considered in nanofluids and Buongiorno's model is employed. The boundary layer equation is obtained by reducing the governing equations to an ordinary differential equation. Partial differential equations are converted to ordinary differential equations using a suitable similarity transformation. The bvp4c simulation on Matlab is then used to solve ordinary differential equations. According to the numerical data, the dual solutions occur in a specific range of α. The parameter α refers to the stretching/shrinking where shrinking (less than 0) is the main reason the dual solution exists. The stability analysis is presented graphically and in tabular form to prove that there are two solutions to the problem and only one of them is stable. As a result, our research shows that the solution is only stable in the first solution, but not in the second.