bluuebunny/crossref_metadata_2025 huggingface dataset:
Peningkatan Keaktifan dan Hasil Belajar Siswa pada Pembelajaran Statistika melalui Model Problem Based Learning Berbantuan Microsoft Excel
Authors: Indriati Wahyu
Published: April 2022

Kontrol guru terhadap aktivitas siswa selama pembelajaran pada proses pembelajaran daring adalah sangat terbatas. Interaksi yang terbatas dalam pembelajaran daring ini merupakan salah satu sebab siswa berkurang keaktifannya dalam pembelajaran sehingga baik proses maupun hasil pembelajaran menjadi terhambat. Subjek penelitian ini diambil dari siswa kelas XII IPA 3 SMA Negeri 2 Yogyakarta dengan siswa berjumlah 36 orang terdiri 19 siswa perempuan dan 17 siswa laki-laki. Penelitian ini berupa penelitian tindakan kelas yang dilaksanakan pada semester gasal Tahun Pelajaran 2021/2022. Penelitian dilakukan dalam dua siklus. Penelitian ini bertujuan untuk meningkatkan keaktifan dan hasil belajar statistika siswa dengan menggunakan model pembelajaran Problem Based Learning berbantuan Microsoft Excel. Hasil penelitian menunjukkan bahwa untuk meningkatkan keaktifan dan hasil belajar siswa dapat diupayakan dengan menggunakan model pembelajaran Problem Based Learning berbantuan Microsoft Excel dalam pembelajaran statistika. Pada kondisi awal atau pra siklus keaktifan siswa memperlihatkan angka sebesar 54,75%, dan pada saat kondisi siklus I keaktifan siswa naik menjadi 72,80%, dan bertambah peningkatannya pada kondisi siklus II yaitu 80,21%. Sedangkan hasil belajar matematika siswa dari pra siklus (keadaan awal) dengan nilai rerata menunjukkan angka 76,19, meningkat menjadi 76,59 pada siklus I, dan bertambah peningkatannya pada siklus II menjadi 82,75.
Peningkatan Keterampilan Berbicara Teks Naratif melalui Metode Storytelling
Authors: Fauziyah Tituk Romadlona
Published: April 2022

Keterampilan berbicara teks naratif siswa X IPS 2 SMA Negeri 10 Yogyakarta tahun pelajaran 2020-2021 masih rendah. Tujuan penelitian ini adalah peningkatan keterampilan berbicara teks naratif siswa melalui metode storytelling. Penelitian ini berjenis penelitian tindakan kelas dengan instrumen berupa observasi, angket, penilaian unjuk kerja, dokumentasi. Pelaksanaan penelitian ini dari bulan April sampai Mei tahun 2021 sebanyak 2 siklus. Di setiap siklus terdapat 4 kegiatan, yaitu perencanaan, tindakan, pengamatan, refleksi. Subjek penelitian ini siswa X IPS 2 SMA Negeri 10 Yogyakarta tahun pelajaran 2020-2021. Ditunjukkan oleh hasil penelitian bahwa persentase jumlah siswa yang nilainya sudah KKM selalu naik. Di tahap prasiklus yang mencapai KKM 16 siswa (45.72%), meningkat 18 siswa (51.43%) di siklus 1, dan meningkat lagi menjadi 31 siswa (88.57%) di siklus 2. Kenaikan jumlah siswa yang mencapai KKM dari tahap prasiklus sampai siklus 2 adalah 42.85%. Persentase perolehan rerata nilai siswa mengalami kenaikan pula sebanyak 3.65%, dari 75.20% pada tahap prasiklus ke angka 75.80% di siklus 1, dan 78.85% di siklus 2. Simpulnya, keterampilan berbicara teks naratif dapat ditingkatkan dengan metode storytelling.
Pemberdayaan Paguyuban Orang Tua Siswa untuk Meningkatkan Motivasi dan Prestasi Siswa Kelas Khusus Olahraga
Authors: Tumuruna Jaka
Published: April 2022

Best practice ini bertujuan mendeskripsikan langkah-langkah dan hasil SMAN 4 Yogyakarta dalam memberdayakan Paguyuban Orang Tua Siswa (Potsis) guna meningkatkan motivasi dan prestasi siswa Kelas Khusus Olahraga (KKO). Metode penelitian ini menggunakan pendekatan deskriptif kualitatif, dengan teknik pengumpulan data menggunakan angket. Langkah-langkah pemberdayaan Potsis dilakukan dengan cara; (1) wali kelas; (2) kelas inspirasi, (3) kelas orang tua; (4) pertemuan khusus; (5) komunikasi dengan Whatsapp Group (WAG); dan (6) telepon atau Short Message Service (SMS). Berdasarkan hasil angket, diperoleh data bahwa Potsis mampu meningkatkan motivasi siswa KKO yang ditandai dengan meningkatnya prestasi siswa. Selain itu, pemberdayaan Potsis juga meningkatkan: (1) tanggung jawab, disiplin, semangat belajar, etika, dan ketuntasan belajar masing-masing sebesar 53,125%, 31,25%, 43,75%, 56,25%; dan 43,75%; (2) prestasi olahraga; (3) hasil ujian nasional; dan (4) lulusan yang diterima di perguruan tinggi negeri.
Integration of Critical and Creative Thinking Skills in Solving HOTS Questions through the SOLE Model on Counting Rules
Authors: Azizah Muflichati Nurin
Published: April 2022

One of the provisions of student to be able to answer the challenges of the 21st century is to be able to integrate critical and creative thinking skills in solving problems. The purpose of study was to determine the increase in integration of students’ critical and creative thinking through HOTS questions using the Self-Organized Learning Environments model in the Counting Rules learning topic at SMA Negeri 1 Yogyakarta. This classroom action research was carried out in two cycles, in which cycle consisted of planning, action, observation, and reflection. This study uses three stages in the SOLE model, namely Question, Investigate, and Review. Giving inquiry questions followed by the application of students’ knowledge in interesting and directed tasks in the student worksheets to increase curiosity and provoke students to start using their critical thinking skills. Solving LOTS, MOTS, and HOTS problem solving gradually train students to integrate critical and creative thinking skills. Each group presents the results of their exploration and investigation to improve the integration of critical and creative thinking skills of students. The result of observations on integration of critical thinking show that 15,63% of students are in very high criteria and 84,73% in high criteria. The same result is shown in the integration of creative thinking skills. The achievement test of student learning outcomes in the aspect of knowledge and skills is 87,50%. In this study also obtained the result of the implementation of learning is 93,33%. This research concludes that there is an increase in the integration of students’ critical and creative thinking skills in the Counting Rules.
Discovery Learning Berbantuan Virtual Chemistry Laboratory untuk Meningkatkan Hasil Belajar Siswa
Authors: Hendrajanti Paulina
Published: April 2022

Penelitian ini bertujuan meningkatkan hasil belajar siswa pada materi Titrasi Asam Basa di kelas XI MIPA 1 SMAN 4 Yogyakarta dengan menerapkan model Discovery Learning berbantuan Virtual Chemistry Laboratory tahun pelajaran 2020/2021. Metode penelitian yang digunakan adalah penelitian tindakan kelas dengan mengadopsi model Kurt Lewin yang setiap siklusnya terdapat kegiatan perencanaan, pelaksanaan, pengamatan, dan refleksi. Pelaksanaannya dua siklus dan tiap siklus terdiri dari dua kali pembelajaran daring. Subjek kegiatan ini adalah siswa kelas XI MIPA 1, dengan data awal hasil belajar pengetahuan dan ketuntasan klasikal di masa pandemi di bawah KKM. Alat/instrumen untuk pengumpulan data berupa lembar observasi, instrumen penilaian tes dan non tes, skala Likert, dan dokumentasi. Hasil penelitian menunjukkan: (1) Pada siklus I hasil belajar aspek pengetahuan = 85,70%; aspek keterampilan = 88,16%; aspek sikap = 81,63 %; ketuntasan belajar klasikal = 94,44%, (2) Pada siklus II hasil belajar aspek pengetahuan = 86,44%; aspek keterampilan = 92,72%; aspek sikap = 83,19%; ketuntasan belajar klasikal = 94,44%.  Simpulan penelitian adalah penerapan Discovery Learning berbantuan Virtual Chemistry Laboratory sangat melibatkan aktivitas mental dan keterampilan sehingga dapat meningkatkan hasil belajar siswa pada materi Titrasi Asam Basa di kelas XI MIPA 1 SMAN 4 Yogyakarta tahun pelajaran 2020/2021.
Implementasi Metode Everyone is a Teacher Here untuk Meningkatkan Keaktifan dan Hasil Belajar Sosiologi Kompetensi Ketimpangan Sosial
Authors: Sutrisna Sutrisna
Published: April 2022

Ketimpangan sosial merupakan materi sosiologi yang memerlukan kualitas pemahaman yang mendalam. Siswa harus memahami konsep dan penerapannya dalam kehidupan masyarakat. Untuk itu perlu metode pembelajaran yang lebih mengaktifkan siswa. Penelitian ini berupaya memberikan informasi tentang keaktifan dan hasil belajar Sosiologi. Dengan penelitian ini akan diketahui efektifitas metode everyone is a teacher here, keaktifan dan hasil belajar siswa. Penelitian ini merupakan penelitian tindakan kelas yang terdiri dari dua siklus. Masing-masing siklus meliputi empat tahapan dimulai dari perencanaan, pelaksanaan, pengamatan, dan refleksi. Berdasarkan hasil penelitian diperoleh informasi (1) penerapan metode Everyone is a Teacher Here berjalan dengan baik, (2) terjadi peningkatan keaktifan siswa pada aktivitas positif 37,37% mengalami kenaikan aktivitas positif menjadi 83,84%. (3) metode ini mampu meningkatkan hasil belajar Sosiologi pada kompetensi ketimpangan sosial sebesar 33,33%, dari 57,57 % menjadi 90,91%, dengan nilai rata-rata 67,88 menjadi 77,12 atau meningkat sebesar 9,24%. Dengan demikian melalui penerapan metode Everyone is a Teacher Here telah berhasil meningkatkan keaktifan dan hasil belajar Sosiologi pada kompetensi ketimpangan sosial.
Penerapan Model Project Based Learning Berbantuan Moodle E-Learning untuk Meningkatkan Prestasi Belajar Bahasa Inggris
Authors: Sugiharyanti Endang
Published: April 2022

Eksplorasi ini berencana untuk lebih mengembangkan prestasi belajar pengganti yang diarahkan dengan penggunaan model Project Based Learning (PjBL) berbantuan Moodle E Learning. Ujian ini adalah Penelitian Tindakan Kelas (PTK) dengan artikel pengujian siswa kelas XII TKR A SMK Negeri 1 Ponjong. Ujian diarahkan dalam 2 siklus, mulai dari menyusun, melaksanakan, memperhatikan, merefleksi, dan memodifikasi. Strategi dan perangkat berbagai informasi dimanfaatkan dalam eksplorasi ini adalah Instrumen soal (test) yang di upload di Moodle E Learning. Sedangkan untuk keterampilan writing dan speaking, peserta didik mengumpulkan tugasnya melalui alamat link google form. Selanjutnya penanganan informasi dilakukan secara kuantitatif dengan pemeriksaan informasi peserta didik yang memperoleh nilai KKM dan analisis nilai prestasi siswa biasa. Hasil Itulah yang ditunjukkan oleh penelitian belajar dengan penerapan model Project Based Learning berbantuan Moodle E Learning berhasil lebih baik. Hasil penelitian menunjukkan bahwa pembelajaran dengan penerapan model Project Based Learning berbantuan moodle E- Learning bekerja lebih Bagus. Hal ini dibuktikan dengan peningkatan prestasi belajar Bahasa Inggris, dilihat dari persentase ketuntasan prestasi belajar pengetahuan 77%, selanjutnya persentase ketuntasan prestasi belajar writing 83% dan persentase ketuntasan  prestasi  belajar speaking meningkat menjadi 83%.
Youtube Math Video Content for Optimization of Blended Learning with Assessment Using the Moodle Application as an Objective Evaluation Strategy
Authors: Nugroho Wachid
Published: April 2022

Online and direct learning (blended learning) requires support for optimizing student competency achievements as well as alternative choices of assessment model that are objective, practical, and effective in measuring student learning outcomes in a valid way. This best practice writing uses a qualitative descriptive approach with the aim of, firstly, to describe the use of math learning video content on youtube social media accounts to support the optimization of student competency achievements. Second, describe the online assessment model in mathematics subjects based on the moodle application. Third, describe the ease of application of learning and assessment in terms of practicality for teacher and accessibility for students. The research data collection technique uses documentation and observations of the learning and assessment system that has been used so far as well as and interviews with vice principal for curriculum, teachers, and students. The results of the study indicate that the use of youtube content in the form of math learning videos can support the optimization of student competency achievements. While the online mathematical assessment model based on the moodle application with the multiple-choice model could display random questions well, namely random questions from the question bank, random number of questions, and random answer options. Making video content in an easy and practical way using the powerpoint and active presenter application then uploading it to youtube social media account. While the online assessment model is also easy and practical to use in all subjects with the help of the examview application and can be apllied to daily assessments, midterm assessments, end-of-semester assessment, and school exams.
Peningkatan Keaktifan dan Hasil Belajar Peserta Didik Materi Harga Satuan Pekerjaan Konstruksi melalui PBL Berbantuan Video Tutorial
Authors: Wahyuningsih Anik Rahmawati
Published: April 2022

Selama masa pandemi Covid 19, pembelajaran dilakukan secara daring, materi pelajaran diunggah di kelas teams, kemudian disampaikan dengan metode ceramah melalui meeting online. Dengan cara ini, keaktifan dan hasil belajar peserta didik masih rendah. Penelitian ini bertujuan untuk mendeskripsikan proses peningkatan keaktifan dan hasil belajar peserta didik, dengan target pencapaian hasil belajar 85% mencapai nilai KKM 70 dan 70% peserta didik memiliki keaktifan dalam kategori baik. Penelitian tindakan kelas ini dilaksanakan di SMK Negeri 2 Klaten pada kelas XI DPIBB yang berlangsung dalam 2 siklus. Data hasil belajar diperoleh dari tes tulis, sedangkan data keaktifan peserta didik diperoleh dari kuesioner dan pengamatan. Untuk memperoleh data-data tersebut, penulis menggunakan berbagai media online, yaitu dengan google formulir, grup whatsapp, email, kelas teams dan channel youtube. Materi pelajaran dikemas dalam bentuk video tutorial dan diunggah di channel youtube, kemudian tautannya diberikan kepada peserta didik. Validasi data menggunakan validasi isi yang dilakukan melalui verifikasi kuesioner dan soal tes tulis oleh rekan guru. Data yang sudah diperoleh dianalisis dengan teknik deskriptif kuantitatif yang membandingkan antara kondisi awal, dengan kondisi setelah tindakan. Hasil penelitian: (1) Setelah tindakan, peserta didik yang memiliki keaktifan dalam kategori baik sebanyak 77,7%, dan prosentase peningkatan keaktifan peserta didik adalah sebesar 64,44%. (2) Setelah tindakan, 86,11% peserta didik dapat mencapai nilai KKM dan prosentase rata-rata peningkatan hasil belajar adalah 9,57%. (3) Problem Based Learning (PBL) berbantuan video tutorial dapat meningkatkan keaktifan dan hasil belajar peserta didik.
Aplikasi Pengolahan Data Sertifikat Tanah Pada Kantor Badan Pertanahan Nasional Kabupaten Bireuen Berbasis Java
Authors: Iqbal Iqbal , Rahman Wahyu Ahmad
Published: April 2022

Badan Pertanahan Nasional (BPN) Kab Bireuen Mempunyai beberapa divisi, sala satunya divisi sertifikasi pertanahan. Pengolahan data sertifikat pertanahan yaitu kegiatan pendaftaran tanah untuk pertama kali secara serentak  yang meliputi semua objek pendaftaran tanah yang belum didaftar dalam wilayah atau bagian wilayah suatu desa/kelurahan karena masih menggunakan cara konvensional yaitu dengan mencatat pada media pembukuan  sehingga memerlukan waktu yang cukup lama dalam proses pengolahan data, selai itu dalam pengarsipan data sering terjadi kerusakan bahkan kehilangan data hal tersebut dinilai tidak efektif dan tidak efisien. Penelitian ini bertujuan untuk menghasilkan sebuah aplikasi yang dapat mempermudah staf sertifikasi pertanahan dalam melakukan pengolahan data serta pencarian arsip yang diperlukan sehingga tidak membutuhkan waktu yang cukup lama. Dengan adanya aplikasi pengolahan data berbasis java yang dapat membantu mempermudah proses pengolahan data pada badan pertanahan nasional kab Bireuen divisi sertifikasi pertanahan. Untuk itu diperlukan sistem yang dapat mempermudah kinerja karyawan dalam perlakuan pengolahan data. Sistem yang dimaksud adalah Sistem Pengolahan Data Pendaftaran Permohonan Hak Atas Tanah. Aplikasi ini dibangun dengan menggunakan bahasa pemrograman java netbeans dan menggunakan database mysql. Sehingga data yang tersimpan lebih aman dan terjaga.
Rancang Bangun Website Galacticos Fc Bireuen
Authors: Winar Sri , Fajri Riyadhul , Maireza Andre
Published: April 2022

Abstrak - Sepak bola adalah salah satu olahraga yang sangat populer di dunia. Pertandingan olahraga ini dimainkan oleh dua kelompok berlawanan yang masing-masing berjuang untuk memasukkan bola ke gawang kelompok lawan. Masing-masing kelompok beranggotakan sebelas pemain dan karenanya kelompok tersebut juga dinamakan kesebelasan. Provinsi Aceh memiliki beberapa tim sepak bola yang berlaga di Liga 2 maupun Liga 3 yang berada dibawah naungan Persatuan Sepakbola Seluruh Indonesia (PSSI). Setiap tim sepak bola memiliki stadion sebagai home base yang digunakan untuk pertandingan. Seiring banyaknya jumlah tim di Provinsi Aceh, maka terdapat masalah yaitu bagaimana menganalisis informasi, memantau perkembangan tim dan memberikan informasi yang berhubungan dengan data spasial dan non spasial. Dalam penelitian ini penulis membuat sebuat sistem berbasis web yang menampilkan biodata pemain, pengurus dan official. Sistem ini dibuat dengan menggunakan framework codeigniter dengan template Sbadmin2 dan Mysql sebagai basisdata
Sistem Informasi Posyandu Kabupaten Bireuen Berbasis Authorization Managament System
Authors: Rizani Fitri
Published: April 2022

Perkembangan teknologi sistem informasi yang semakin berkembang memberikan kostribusi pada bidang yang lain. Khususnya dunia komputer yang membawa kemajuan di berbagai bidang, Posyandu adalah kegiatan kesehatan yang diselenggarakan dari, oleh, dan untuk masyarakat yang dibantu oleh petugas Dinas Kesehatan setiap Kabupaten, khususnya di desa Paya Meuneng, Paya Reuhat, Gedong-gedong, Lancok, dan Cot Ijue Kabupaten Bireuen pelaksanaannya dimulai dari petugas Pusat Dinas Kesehatan datang ke Desa-desa tersebut sesuai dengan permintaan. Dinas Kesehatan Kabupaten Bireuen belum memanfaatkan teknologi informasi secara penuh dalam proses pelaksanaan Posyandu, dimana Panitia pelaksana masih melakukan dengan cara manual, untuk Ibu hamil pendataannya menggunakan buku sedangkan untuk balita menggunakan formulir, kemudian Ibu hamil melakukan pengukuran tinggi badan, lingkar lengan, penimbangan berat badan tekanan darah, dan pemerikasaan kandungan, untuk Balita melakukan pemeriksaan gizi, pengukuran tinggi badan, lingkar lengan, dan penimbangan berat badan. Penyimpanan data belum menggunakan database, masih di rekap memakai aplikasi Microsoft Excel selanjutnya di printout sebanyak yang diperlukan, Ada banyak model sistem dalam pengelolaan data, salah satunya adalah Autorization Management System yang bisa menentukan permission untuk setiap user. Penulis melihat bahwa model System ini sangat cocok diterapkan untuk pengelolaan data kegiatan Posyandu, dikarenakan setiap desa lagi harus membuat sistem dari awal
Perkembangan Makroekonomi Negara Kanada Dengan Analisa Vector Error Correction Model (VECM)
Authors: Sunarya I Wayan
Published: April 2022

This study aims to analyze the relationship between Gross Domestic Product (GDP), Inflation (INF), Import (IMP) and Unemployment (UEM) that occurred in Canada by using Vector Error Correction Model (VECM) analysis. The data source comes from https://www.imf.org; data taken from 1980 to 2020. The analytical tool used is the Vector Error Correction Model (VECM) which aims to analyze the relationship or causality between variables both in the short and long term, where the results obtained are the relationship between variables more referring to short term causality. And to find out the impact between variables, this study uses an Impulse Response Function (IRF) analysis where the results that have a positive impact during the Covid-19 pandemic are import shocks to GDP in Canada while the results that have a negative impact are import shocks on unemployment and also Canada's unemployment rate against GDP during the COVID-19 pandemic.
Impact of CEO compensation and CEO Power on Firms’ Innovation Moderating Role of Ownership Structure
Authors: Akram Hamza , Azam Neelam , Farooq Muhammad Usman , Ahad Abdul , Saadat Usama
Published: April 2022

CEO compensation and power have crucial issues in assessing the innovative culture of firms. To address this issue, this study aims to investigate the nexus between CEO compensation and power on firms’ innovation under moderating role of ownership structure (measured in terms of ownership concentration, business group affiliation and CEO ownership). Ownership structure (ownership concentration, business group affiliation and CEO ownership) enables shareholders to exercise their statutory rights which play a vital role in the strategic decision-making of a company. To test the aforesaid relationship, data has been extracted from 27 chemicals and pharmaceutical firms listed at the Pakistan Stock Exchange during 2013-2021. The data gathered, thus, has been analyzed using various statistical techniques namely: descriptive analysis, correlation analysis, and multiple regression analysis. Due to presence of various issues in data such as heteroscedasticity, auto-correlation and cross-sectional dependence, researcher has employed Panel Corrected Standard Error Model (PCSE). The findings reveal that CEO compensation has positive effect on firms’ innovation. Another interesting finding is that this relationship becomes negative under conditional role of ownership structure (ownership structure, business group affiliation, and CEO ownership) which supports agency theory. However, CEO power has no role in firms’ innovation even under moderating role of ownership structure. The findings offer certain implications for practitioners to fix the compensation of CEO in order to resolve type I and II agency issues, which can improve firms’ innovation. Findings of this study can help investors, policymakers and creditors to understand the importance of CEO compensation and power towards firm innovation in the presence of ownership structure
Study on the adsorption of Congo Red (CR) onto graphene oxide/ polyvinyl alcohol/ Fe3O4
Authors: Le Dieu Thu  , Tran Vinh Hoang
Published: April 2022

Graphene oxide/polyvinyl alcohol/Fe3O4 (GPF) nanocomposites, which have been synthesized successfully in the previous study [6], have been investigated the removal of Congo Red (CR) from aqueous solution. The results show that, the adsorption process get equilibrium state after 80 min., the optimal amount of adsorbent is 0.01 g and this process is favorable at low temperature. The Congo red adsorption is better described by the Langmuir model (R2 = 0.991) than by the Freundlich model (R2 = 0.957). So, it can be presumed that Congo red was adsorbed in a single monolayer with the maximum adsorption capacity of 23.31 mg/g.
Nonenzymatic formaldehyde sensors using nickel oxide based electrode fabricated by electrochemical method
Authors: Nguyen Van Truong  , Thai Minh Duc  , Tran Quoc Toan  , Pham Hong Chuyen  , Dang Van Thanh  , Nguyen Quoc Dung
Published: April 2022

NiO materials were fabricated by electrochemical exfoliation combined with ultrasonic vibration to produce nano-sized particles. By electrophoresis, NiO particles dispersed in IPA solvent (isopropyl alcohol) were precipitated on the ITO substrate acting as the cathode. The morphology and structure of the materials were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The role of electrophoresis potential, electrophoresis time on electrode formation was investigated when studying the effect on electrochemical properties of the electrode for formaldehyde in aqueous solution. As a result, with the NiO dispersion system (0.1 g NiO in 50 mL IPA), the distance between the ITO electrode (negative electrode) and the Pt plate (positive electrode) of 2 cm, the electrophoresis potential of 10 V, electrophoresis time of 3 min is optimized for fabrication of NiO/ITO electrode in formaldehyde electrochemical sensor. Sensitivity and linear range at different electrode potentials were investigated when determining the concentration of formaldehyde in water.
Synthesis composite chitosan-mangetite apply to adsorption antibiotic in aqueous
Authors: Vu Quang Tung  , Bui Minh Quy  , Hoang Thi Duyen
Published: April 2022

This article studies on the synthesis of chitosan – magnetite composite materials (CM) by in-situ method. The composite materials were synthesized in mass ratio chitosan: magnetite from 9:1 to 4:6. The characterization of CM composites were determined by XRD and SEM methods showed that the crystal size and material surface depend on the proportion of chitosan added during the synthesis. These materials were able to removal CFX antibiotics in aqueous by adsorption method. The CM46 composite adsorbed well CFX with equilibrium time of 60 minutes. The adsorption of CFX onto CM46 followed the Langmuir and Freundlich adsorption model. The maximum adsorption capacity was 53.25 mg/g. The kinetic of the removal fitted better to the pseudo-second-order.
Synthesis, structure and anticancer activities of Zn(II), Cd(II) complexes with 5,7-dichloro-8-hydroxyquinoline-2-carboxaldehyde-4-methyl-3-thiosemicarbazone
Authors: Ninh Thi Minh Giang  , Nguyen Thi Bich Ngoc  , Le Thi Hong Hai
Published: April 2022

Two new complexes [Zn(QMS)] and [Cd(QMS)] were synthesized by reaction between MCl2 (M = Zn, Cd) with  5,7-dichloro-8-hydroxyquinoline-2-carboxaldehyde-4-methyl-3-thiosemicarbazone (H2QMS). Their structures were determined by ESI-MS, IR and 1H NMR spectroscopies. The results showed that in these complexes the ratio of M(II) : H2QMS ligand is  1 : 1, M(II) is bound to H2QMS ligand through O, Nquinoline, Nthiosemicarbazide and S atoms. The complexes were tested for cell in vitro cytotoxicity on human cancer cells including KB, Hep-G2, LU and MCF-7. The results showed that ZnQMS complex exhibits high antitumor activities on KB, Hep-G2, Lu cancer cell lines with IC50 values 9,41; 5,53 and 6,73 μM respectively. CdQMS complex gives a high activity against on LU cancer cell line with IC50 value 4,54 μM.
Removal of methylene blue from aqueous solutions by internal microelectrolysis on the Fe-Cu materials
Authors: Do Tra Huong  , Nguyen Van Tu  , Nguyen Anh Tien  , Nguyen Phuong Chi  , Doan Van Kiet
Published: April 2022

Fe-Cu material is made by chemical plating method. Materials Fe-Cu is used removal of methylene blue from aqueous solution by internal microelectrolysis. The results show that with optimal conditions for methylene blue  decomposition is pH of 4, contact time of 120 minutes, material weight of 1.67 g/L, shaking rate of 300 revolutions per minute (rpm), methylene blue removal efficiency is 93.63 %, with the initial concentration is 245.11 mg/L. The process of decomposition of methylene blue by Fe-Cu material follows the assumed second order kinetic equation with reaction rate constant k = 0.0023 min-1. L.mg-1, The results show that materials Fe-Cu can be applied to remove methylene blue from aqueous solution by internal microelectrolysis
Fabrication of ZnO thin film by dip-coating technique and study of photocatalytic activity in Rhodamine B degradation reaction
Authors: Vu Viet Doanh  , Trinh Quang Thong  , Le Hai Dang
Published: April 2022

In this study, ZnO thin films were fabricated by dip-coating technique used solution synthesized by sol-gel method. The influence of film area and RhB concentration on the photocatalytic activity of ZnO films was determined. Accordingly, the survey results irradiation with a UV lamp 5W showed that both the efficiency and the rate constant increased when the film’s area used increased, but the mass of RhB decomposed in 1 hour calculated according to 1 m2 films again decreased. In the case of increased RhB concentration, the results show that the efficiency and the reaction rate constant decrease in value. Finally, an important point to mention is the film samples can be reused many times showing high potential for practical applications.
Study on UV resistance of high density polyethylene composite using waste gypsum
Authors: Tran Huu Trung  , Mai Duc Huynh  , Tran Thi Mai  , Nguyen Huu Dat  , Nguyen Thi Dieu Linh  , Nguyen Thi Thu Trang  , Thai Hoang  , Nguyen Vu Giang
Published: April 2022

Every year, a large amount of waste gypsum, a by-product of fertilizer production, was produced and landfilled that increasing the harm to the environment. In this study, for the purpose of utilizing waste gypsum, it was studied as the filler in blend of high density polyethylene (HDPE) and ethyelene vinyl acetated (EVA) with anti UV additives in order to improve the mechanical strength and lifespan of this composite. After using ethylene bis stearamide (EBS) to modify waste gypsum, modified waste gypsum (mGyp) and anti-UV additives at various contents were dispersed into HDPE/EVA blend by melt-mixing method to obtain HDPE/EVA/mGyp composites. As the results, the color difference and tensile strength of composite using additives did not changed much after 20 cycles of accelerated weathering test. In the presence of anti-UV additives, the photodegradation process was inhibited by showing the low carbonyl index of composite compared with samples without additives. Beside, the structure of composite using anti-UV additives is smooth and without cracks after accelerated weathering test as observed in SEM images. That led to the tensile strength of sample did not change much.
Evaluation the metal content of copper (Cu), manganese (Mn) and zinc (Zn) in in fish species Gerres filamentosus (Cuvier, 1829) in Gianh river at Quang Trach district, Quang Binh province.
Authors: Nguyen Mau Thanh  , Nguyen Duc Vuong  , Nguyen Nho Dung  , Nguyen Thanh Binh  , Le Thu Ha  , Nguyen Dinh Luyen
Published: April 2022

In recent years the fish consumption advisories for the population has become of great concern. The flame atomic absorption spectrometry (F-AAS) was applied to determine the copper, maganese and zinc content in fish species Gerres filamentosus (Cuvier, 1829) from Gianh river at Quang Tranh distric, Quang Binh province. This method had a high repeatability with RSD < 4.3%, the recovery from 94 % to 106 %, and low limit of detection. Our results showed that the average concentration of copper, maganese and zinc in fish species Gerres filamentosus (Cuvier, 1829) were 0.388 ÷ 0.601 mg/kg fresh; 0.261 ÷ 0.321 mg/kg fresh and 7.325 ÷ 10.120 mg/kg fresh, respectively. These concentration were within the allowed limits according to the regulation No. 46/BYT 2007. Our results give important finding about the consumption limits on certain metals, especially for Cu, Mn and Zn, all for minimizing potential health risks in population and related risk-based consumption limits for adults and children.
Preparation and thermal conductivity of nanofluid-based coolanol 20 containing carbon nanotubes
Authors: To Anh Duc  , Phan Ngoc Minh  , Bui Hung Thang
Published: April 2022

In this paper, we present the obtained results in the fabrication and thermal properties of nanofluid-based Coolant 20 containing carbon nanotubes (CNTs). To improve dispersion efficiency, CNTs materials were functionalized with an -OH functional group by chemical methods. After the functionalization process, the CNTs-OH materials were dispersed into Coolant 20 based fluid by surfactant and the ultrasonic vibration method. The experimental results of size distribution spectrum and Zeta potential show that carbon nanotubes were dispersed uniformly and stably in the based fluid. The presence of CNTs has improved thermal conductivity of the nanofluid, with a concentration of 1,0 vol.% CNTs showing an increase in thermal conductivity of 65%. Nanofluid-based Coolant 20 containing carbon nanotubes helped to improve heat exchange efficiency for components and devices operating under special conditions, among other applications.
Preparation and characterization of Ammonium Polyphosphate/Diatomite Composite flame-retardant fillers
Authors: Tran Thi Thinh  , La The Vinh  , Nguyen Quang Bac
Published: April 2022

Ammonium Polyphosphate (APP) has been known as an effective flame retardant, but its dispersion in some materials is very poor so it is necessary to incoporate APP with some suitable additives. This study refers to the preparation of APP/Diatomite (DIA) composite flame-retardant fillers. The materials were prepared by two methods: by adding diatomie powder to the mixture during the preparation of APP or by adding diatomite powder to the suspension of very fine solid APP particals in water. The samples were put into separate porcelain bowls and dried at 210°C for 3 hours. The structure and morphology of the material was identified using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) techniques. Thermogravimetric (TG) analysis was performed to evaluate the thermal degradation behaviors of the material.
Distribution and characteristics of microplastics in surface water at some beaches in Thanh Hoa province, Viet Nam
Authors: Dao Dinh Cham  , Duong Thi Lim  , Nguyen Quang Bac  , Dao Ngoc Nhiem  , Dang Tran Quan  , Nguyen Thi Lan Huong  , Duong Cong Dien  , Duong Thanh Nghi  , Dinh Ngoc Hai
Published: April 2022

Microplastics present in high density in coastal marine environments have been reported by many published works worldwide. Microplastic presence poses a major threat to all organisms that come into direct contact with them in the aquatic environment because they are non-biodegradable and adsorbable to some toxic substances. Besides, through the food chain, it can affect human health. This study provides data on the density and characteristics of microplastics such as shape, size, and color in the aquatic environment of three beaches (Hai Tien, Sam Son, Hai Hoa) in Thanh Hoa province. Microplastics were detected at all sampling locations at high abundance. The largest microplastic abundance was 44.1 items/m3 at Hai Tien beach, while the smallest was 15.5 items/m3 at Sam Son beach. The results indicated that the most common microplastic shape was fragment shape which accounted for 50.2 to 80.2% of total microplastics. The size was smaller than 500 µm covered from 66.1 to 87.7 % of total microplastics. Among that, white, yellow, and black are the main colors of microplastics in the aquatic environment of this region.
O3-type layered Ni-rich cathode: synthesis and electrochemical characterization
Authors: Nguyen Le Minh  , Nguyen Van Hoang  , Bach Le Thuy Trang  , Tran Van Man  , Le My Loan Phung
Published: April 2022

Ni-rich layered oxides are currently the state-of-the-art material of Lithium-ion batteries due to the balance between the cost, power and energy density. In this work, Ni-rich O3-type NaxNi0.76Mn0.14Co0.10O2.04 (NMC) material was synthesized by the conventional solid-state reaction and investigated as a cathode material for sodium-ion batteries. Rietveld refinement shows that the material is high purity O3-type layered oxide of >91%.  In the charge/discharge test, the material was provided the reversible capacity of 156 mAh.g-1 initially at 0.1 C with 50% capacity retention after 50 cycles in the voltage range of 2.0 – 4.2 V. In addition, this material also demonstrates great rate-capability with the discharge capacity of 50 mAh.g-1 even at 5 C. Therefore, NMC material could be a promising candidate for high energy sodium-ion batteries.
Preparation of high purity α-Al2O3 from industrial aluminum hydroxide
Authors: La The Vinh  , Nguyen Thi Hong Phuong  , Nguyen Minh Anh
Published: April 2022

Aluminum oxide (alumina; Al2O3) has advantages such as its thermal, chemical, and physical properties when compared with several ceramics materials. It is widely used in ceramics such as firebricks, abrasives and integrated circuit (IC) packages; catalysts; catalyst supports; ion exchange and other fields. Alumina has a complex structure and many crystalline polymorphic phases such as α-Al2O3, βAl2O3, γ-Al2O3, δ-Al2O3, θ-Al2O3, η-Al2O3, κ-Al2O3, χAl2O3 and ρ-Al2O3. Among these phases, α-Al2O3 is widely used and studied as high temperature structural material, electronic packaging, corrosion resistance ceramics and translucent ceramics. This study focus on the preparation of high purity α-Al2O3 from industrial aluminum hydroxide. The results show that after removing Na2O and SiO2 with distilled water, the sample was dissolved in NaOH solution to form NaAlO2 solution. Precipitating of Al(OH)3 from NaAlO2 solution with one of the following substances: HCl (4N), H2SO4 (4N), CH3COOH (4N) or CO2 (45% Vol). The precipitated Al(OH)3 was filtered and washed with distilled water and then dried. Finally, thermally decompose Al(OH)3 at 11000C in 2 hours to form pure α-Al2O3.
Synthesis and properties of YVO4:Ho and YVO4:Ho,Bi luminescent nanomaterials by combustion method
Authors: Nguyen Vu  , Nguyen Thi Thoi  , Pham Duc Roan  , Nguyen Manh Hung  , Lam Thi Kieu Giang  , Dinh Manh Tien
Published: April 2022

YVO4:Ho and YVO4:Ho,Bi nanophosphors were synthesized via combustion synthesis using urea as fuel and metal nitrates as precursor. Structures, morphologies and optical properties of YVO4:Ho and YVO4:Ho,Bi nanophosphors annealed at 900 °C were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescent (PL) and photoluminescent excitation (PLE) spectra. The clearly YVO4 tetragonal phase was obtained. The average diameters for the phosphor particles are 20-30 nm. The nanophosphors could be excited by 320 nm which correspond to the VO4 absorption and then PL spectra of YVO4:Ho and YVO4:Ho,Bi nanophosphors are described by the 5F8, 5S2 – 5I8, 5F5 – 5I8 và 5F4, 5S2 → 5I7  transitions of Ho3+ ions at 543, 655 and 755 nm. The effects of Ho3+ and Bi3+ concentrations on structure and optical properties have been investigated.
Sn doped Hematite Nanorods for High-Performance Photoelectrochemical Water Splitting
Authors: Truong Thi Hien  , Vu Thi Bich  , Phan Thi Binh  , Mai Thi Thanh Thuy  , Man Minh Tan  , Nguyen Tien Dai  , Tran Thi Trang  , Chu Thi Thu Hien  , Chu Van Tuan  , Nguyen Thi Nguyet
Published: April 2022

Photoelectrochemical water splitting is of great attention due to its environmentally friendly generation of clean fuels. Hematite (α-Fe2O3) is considered a promising candidate due to its intrinsic properties for the high-performance photoelectrochemical electrode, such as favorable bandgap (2.0–2.2 eV), a suitable energy band position non-toxicity, low cost, and excellent chemical stability. Herein, we report about Sn-doped hematite nanorods and their implementation as photoanodes for photoelectrochemical water splitting. We provide the simple but efficient route to incorporate the Sn into the hematite without structural damage in the nanostructure and scrutinize the effect of Sn dopant on the photoelectrochemical activity of the hematite. Sn can be successfully incorporated into the hematite by the two-step heat treatment process, which reveals the enhanced photoelectrochemical responses compared with undoped hematite.  We elaborate on the effect of Sn dopant in the hematite on the photoelectrochemical activities, thereby suggesting the optimum concentration of Sn dopant.
Synthesis, characterizations and the photocatalytic ability of Co1-xZnxFe2O4 spinels prepared by combustion method
Authors: Nguyen Xuan Dung  , Phan Thi Minh Huyen
Published: April 2022

In this research, Co1-xZnxFe2O4 (x=0-0,5) spinel ferrites were synthesized at 5000C by combustion method using glycine and metal nitrates. The powder samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX). X-ray analysis showed that all samples have single phase cubic spinel structure. Structural parameters of spinels were also determined from XRD datas. The lattice constants, cell volumes increased with the increase in zinc substitution. The average crystallite sizes of the particles were determined with Zn content from 11 to 16 nm. The TEM images reveals the spherical shapes of  nanoparticles with an average particle size less than 20 nm. The photocatalytic activity of the spinels were tested by the degradation of methylene blue (MB) in aqueous solution under visible light. The results showed that Zn doped spinels exhibited higher photocatalytic activity than CoFe2O4. Among all the samples, the maximum degradation efficiency  was achieved by the 0.4 Zn substituted cobalt ferrite.
Study on the formation of solid solution when synthesizing manganese-doped zinc alkaline earth silicate luminescent pigment by impregnation - precipitation method
Authors: Nguyen Thi Thanh  , Le Xuan Thanh
Published: April 2022

This work refers to the research results on the ability to form solid solution when synthesizing the manganese-doped zinc alkaline earth silicate luminescent pigment in the form of Zn1,97-xMxMn0,03SiO4 (M is magnesium, calcium, strontium and barium) by the precipitation-impregnation method. The samples were characterized by thermal analysis, X-ray diffraction spectroscopy, luminescence under UV lamp and luminescence spectroscopy at 254 nm excitation wavelength. The results show that when heating the corresponding precipitated precursor at 900 oC for 45 minutes, in general, the ability to form solid solutions decreases when the size difference of alkaline earth metal ions with Zn2+ ions increases. Specifically, Mg2+ ions create single-phase solid solutions with x varying from 0 to 1. Ca2+ ions form solid solutions when x changes from 0 to 0.6. When x = 0.8; in addition to the main phase Zn2SiO4, it also creates Ca2ZnSi2O7 with tetragonal structure. The Ba2+ ions form solid solutions when x varies from 0 to 0.5. When x = 0.6, in addition to Zn2SiO4, there is also BaZn2Si2O7. The Sr2+ ions form a solid solution when x = 0.2. For samples with x ≥ 0.4, in addition to Zn2SiO4, there is also Sr2ZnSi2O7; SrZn2Si2O7/SrO.2ZnO.2SiO2. The single - phase solid solutions all have the rhombo H structure of Zn2SiO4, and all have higher luminescence than the multiphase samples. The sample with the largest x, the sample Zn0,97Mg1,0Mn0,03SiO4 had the highest luminescence, emitting green light corresponding to the wavelength of 525 nm when excited by 254 nm UV light.
Study on preparation of multi-oxide photocatalysts containing CeO2/La2O3 from Vietnamese rare earths to treat ammonium, phosphate and bacterial contamination in To Lich river water
Authors: Nguyen Thi Nhan  , Ha Phuong Long  , Nguyen Thi Thu An  , Vu Duy Hien  , Dao Ngoc Nhiem  , Dang Thi Thom  , Phan Do Hung  , Pham Van Thiem  , Cao Dinh Thanh  , Nguyen Huy Cuong  , Nguyen Dinh Tuyen
Published: April 2022

An integrated new method using multi-oxide photocatalyst materials to treat ammonium and phosphate while killing pathogenic microorganisms in poluttion water. This new method involves the simultaneous use of two types of materials: multi-oxides photocatalyst materials ZnO-MgO-TiO2 (MOX) activated under sunlight, forming free radicals hydroxyl/ superoxide to oxidize and kill pathogenic bacteria and fungi. Multi-metallic oxides were modified with rare earth oxides CeO2/La2O3 (DLQDH) to enhance the removal activity of ammonium and phosphate by crystallization process MgNH4PO4 (MAP). The material samples were characterized by XRD, SEM, UV-Vis, FTIR, EDX, XRF...and evaluated the ability to simultaneously removal of ammonium and phosphate, killing typical bacterial strains (Vibrio parahaemolyticus (VP), Staphylococcus aureus (XSA), E. coli - Coliform (EC) present in To Lich river water under sunlight irradation. Ammonium,  phosphate removal capacity  and bactericidal efficiency results  showed  that these integration method  has potential for practical applications to treat pollution water in the To Lich River as well as other wastewater or agriculture water sources contaminated with ammonium, phosphate and pathogenic microorganisms.
Peran Komite Sekolah dalam Meningkatkan Mutu Sekolah
Authors: Firman Firman , Halima Halima , Arfin Arfin
Published: April 2022

Penelitian ini bertujuan untuk mendeskripsikan peran komite sekolah dalam peningkatan mutu sekolah. Jenis penelitian ini adalah penelitian kualitatif model deskriptif. Pemilihan informan dalam penelitian ini menggunakan purposive sampling dengan informan komite sekolah dengan jumlah 9 orang, kepala sekolah dan orang tua siswa. Teknik pengumpulan data yang digunakan adalah observasi, wawancara serta dokumentasi. Analisis data menggunakan pengumpulan data, penyajian data, reduksi data dan penarikan kesimpulan. Teknik pengabsahan data menggunakan member check. Hasil penelitian menunjukkan bahwa: peran komite sekolah dalam peningkatan mutu sekolah di SMP Negeri Satap 4 Lasolo Kepulauan Kabupaten Konawe Utara yaitu: (1) berkoordinasi dan bekerjasama, (2) ikut terlibat dalam pembuatan program dan pelaksanaan program di sekolah, (3) berpartisipasi dan mengawasi dana keuangan sekolah, dan (4) membantu menampung.
Ölüm ve Yaşam Mekânı Olarak Otel: Anayurt Oteli ve Ölmeye Yatmak’a Karşılaştırmalı Bir Bakış
Authors: UĞURLU Seyit Battal , ATÇA Mülkiye
Published: April 2022

Otel; aidiyetsizlik, yurtsuzluk, geçicilik hislerini barındıran bir mekândır. Ana rahmi, ev, yurt, barınak ve nihayetinde kalıcılık anlamlarını da içeren mekân duygusu, otelin verdiği bu duygu ile keskin bir zıtlık oluşturur. Otel odası, insanın hayatla kurduğu bağların güçlenmesini engellediği gibi, toplumsallığını da zayıflatır. Bu ilişkisizlik kişiye aynı zamanda bir özgürlük alanının kapılarını açma olanağı da sağlar. Yusuf Atılgan’ın Anayurt Oteli ile Adalet Ağaoğlu’nun Ölmeye Yatmak romanlarında otel, ölüm ve dirim kararının alındığı, bir ara yerdir. İki eserde başkişinin bilinç düzeyi farklı olmakla birlikte, intihar mekânı olarak otelin seçilişi ile toplumsal, politik ve bireysel olgularda yenilgi ve isyan bağlantısı kurulur. İlk eserde doğumdan ölüme kadar giden bir süreçte içinde bulunulan mekânla anlamsal bağın kaybedilişi ile gerçekleşen intihar, ikincisinde varoluşsal bir hesaplaşmanın sembolik mekânı olur. Atılgan’ın eserinde otel, geçmişin en detaylı şekilde yeniden yaşandığı ve yaşamsal bağın bir anlamsızlık burgacına saplandığı kendi üzerine örtünen bir mekân olarak döngüsellik arz eder. Ağaoğlu’nun eserinde ise geçmişle hesaplaşma, gelecek yapılır ve varoluş, 68 kuşağı ile kurulan bağın verdiği umut duygusuna bağlanır. İntihar bundan dolayı zihinsel dönüşümün sembolü olarak kullanılır. Bu makalede, anılan iki eserin, başkişilerinin tutum ve davranışları öncelikli olmak üzere, mekânın kurgu ve temaya etkisi, intihar ve otelin varoluşsal açıdan çağrıştırdığı anlamsal örüntü karşılaştırmalı bir biçimde çözümlenmektedir.
Anonim Osmanlı Kroniği’nde Yer Alan Atasözleri ve Günümüz Atasözlerine Yansımaları
Authors: TÜRKÖZ Elif
Published: April 2022

Osmanlı tarihçiliğinin başlangıcı olarak kabul edilen 15. yüzyılda müellifi belli olan tarihlerin yanı sıra anonim Osmanlı tarihleri de kaleme alınmıştır. Tevârîh-i Âl-i Osman olarak adlandırılan bu anonim tarihler, 15. yüzyılın son on dokuz yılında tahtta bulunan II. Bayezid’in hükümdarlığı sırasında çok sayıda görülen eserlerdir. Bunlar, Osmanlı tarihi için taşıdıkları önemin yanı sıra Türk halk edebiyatı açısından da önem arz etmektedir. Halk edebiyatına dair değerli ürünler içeren bu eserlerde yer alan atasözleri, bu çalışmanın konusunu oluşturmaktadır. Çalışmada Prof. Dr. Necdet Öztürk tarafından hazırlanıp Anonim Osmanlı Kroniği adıyla yayınlanan metin esas alınmıştır. İnceleme sonucunda eserde çeşitli olaylar ve durumlar vesilesi ile pek çok atasözünün aktarıldığı tespit edilmiştir. Bu çalışmada atasözleri incelenirken şu yöntem kullanılmıştır: Eserde yer alan atasözleri; girişten sona doğru eserde bulundukları yere göre numaralandırılmış, atasözü verildikten sonra açıklaması yapılmış, sonrasında ise atasözünün hangi olay ya da durum vesilesi ile aktarıldığı açıklanmıştır. Son olarak da günümüz atasözleri ile karşılaştırılan atasözünün günümüzdeki kullanımları verilmiştir. Aktarıldıkları olay ve durumlar ile birlikte ele alınan bu atasözlerinin bir tanesi dışında diğerlerinin günümüzde aynen ya da farklı şekillerde kullanıldığı belirlenmiştir.