bluuebunny/crossref_metadata_2025 huggingface dataset:
Elegant Amazons: Victorian Riding Habits and the Fashionable Horsewoman
Authors: Matthews David Alison
Published: March 2024

The Victorian sidesaddle riding habit was a paradoxical garment. It was a fashionable anti-fashion statement, masculine and feminine, practical yet alluring. While on horseback, the fair equestrian shunned the lace, frills, and furbelows worn by her pedestrian sisters. Even when the bell-like silhouette produced by the crinoline skirt was at its greatest width, the essence of the horsewoman’s garb was a lean, understated, and almost masculine simplicity. She represented the epitome of cultivated elegance and cut a fine figure in her tailored habit and silk top hat. Clad in her severe attire, the horsewoman became a center of visual attention in Victorian England. Though she graced fewer pages than the traditional fashion plate, she put her stamp on paintings, photographs, and caricatures. Preceded by showy, colorful riding costumes and superseded by breeches, caught between the demands of Victorian femininity and rising feminism, the riding habit and the women who wore it were typical of and unique to their era. The modern horsewoman represents a turning point in the history of female dress. She adopted the first sports costume specifically designed for women and opened the way for the invention of other athletic garments like the bicycling suit. The riding habit’s combination of style and practicality launched the fashion for more gender-neutral, utilitarian garments and heralded the advent of the twentieth-century working woman’s uniform: the tailored suit.
QUALITY CERTIFICATION IN EDUCATION: APPLICATION OF ISO 9001 AND ISO 21001
Authors:   SSI ", Zaiets Svitlana ,   Institute of Education Content Modernization"
Published: March 2024

The purpose of the article is to justify the need to implement ISO 21001:2019 "Educational organizations. Management systems for educational organizations. Requirements and guidelines for use" in the activities of domestic educational organizations. The achievement of the goal set in the article was carried out by methods of collecting scientific and practical sources of information and with the help of comparative analysis and analysis of dynamic series. The state of certification according to international and domestic standards in the field of education quality assurance in 2018-2022 was investigated to create common quality strategies. Based on the evaluation of the frequency of key words of ISO 9001 and ISO 21001 standards, their comparison was made. It has been established that the introduction of quality management standards in the educational sector is an important step to ensure the quality of education and increase its competitiveness. The introduction and use of ISO 21001 will significantly improve the management processes of educational institutions and increase the effectiveness of quality management. To understand the readiness of ISO 21001:2019 implementation, a survey of university administration representatives was conducted. The attitude of university admini­strations to the use of ISO 9001 and ISO 21001 standards was established. The results of the survey showed that the existence of an effective accreditation system, the optional introduction of ISO, and the lack of resources (personnel, financial) hinder the process of implementing ISO 21001 in universities. Proposals for the implementation of ISO 21001 in the activities of domestic higher education institutions are based on the need for the formation of a culture not only of administrative activities, but also of changing the environment of the activities of educational institutions and consist in the development of a national policy for the introduction of ISO 21001 in the educational sector, the need to conduct informational and explanatory work among educational institutions about the advantages of the implementation of ISO 21001, provision of financial support to universities implementing ISO 21001.
Fictionalizing Wars in the 20th Century: John Hersey’s Hiroshima, Ghassan Kanafani’s Return to Haifa, Margaret Mitchell’s Gone with the Wind
Authors: Jarrar Sana' Mahmoud
Published: March 2024

This paper scrutinizes some novels that fictionalize wars that broke out during the 20th century. The study argues that the negative impacts of war are comprehended better when intertwined with fiction. The study is implemented through a qualitative descriptive approach. The paper focuses on many novels, including John Hersey’s Hiroshima (1946), Ghassan Kanafani’s Return to Haifa (1945), Margaret Mitchell’s Gone with the Wind (1936). The objective of the paper is to caution against war and unveiling its barbarities. The paper is significant because it is a far cry not to reiterate the black pages of history. The paper tackles the following themes: wars, agony, and colonialism.
PETROGRAPHIC EVALUATION OF OKOBO COAL, NORTHERN ANAMBRA BASIN, NIGERIA
Authors: Fatoye Felix Bamidele , Gideon Yomi Barnabas , Omada Joseph Itah
Published: March 2024

Petrographic studies have been carried out on coal samples from Okobo coal deposit in the northern Anambra Basin of Nigeria. The studies were carried out primarily to determine the petrographic characteristics of the coal based on its composition and vitrinite reflectance. Maceral characterization reveals the presence of the three maceral groups; vitrinite, liptinite and inertinite in all the samples. Generally, the proportion of the vitrinites and inertinites are higher than the liptinites in the samples. On mineral matter-free basis, the coal, on average, contains 65.10 % vitrinite, 11.30 % liptinite and 23.60 % inertinite. With mineral matter counted, on average, it consists of 57.10 % vitrinite, 10.20 % liptinite, 21.50 % inertinite and 11.20 % mineral matter. The coal, on average, also contains 67.30 % reactives (vitrinite + liptinite) and 32.70 % inerts (inertinite + mineral matter). It has mean vitrinite reflectance measurement of 0.54 % Romax on average. These petrographic characteristics suggest that the coal does not possess coking qualities suitable for coke making blends for metallurgical processes such as iron and steel manufacture thereby placing it on low quality and non-coking. However, it is good for electricity generation. The coal is appropriate in heating boilers and ovens in industrial heating process. The cement, glass, ceramics, paper and brick industries can use it for this purpose.
PENERAPAN MODEL PEMBELAJARAN INKUIRI ALBERTA UNTUK MENINGKATKAN KEMAMPUAN BERPIKIR KREATIF MATEMATIS
Authors: Iwan Gunawan  , Riska Resti Wulandari  , Agung Cahya Gumilar
Published: March 2024

Tujuan penelitian ini untuk melihat pengaruh penerapan model Inkuiri Alberta dalam meningkatkan kemampuan berpikir kreatif matematis siswa di SMA. Metode eksperimen dengan desain quasi experimental dijadikan sebagai metode dalam penelitian ini, Sampel dalam penelitian ini dipilih dua kelas yaitu kelas eksperimen dan kelas kontrol. Instrumen penelitian berupa tes tertulis untuk mengukur kemampuan berpikir kreatif matematis dan non tes dalam bentuk observasi untuk mengukur keterlaksanaan pembelajaran model Inkuiri Alberta. Data yang diperoleh selanjutnya diolah dengan teknik statistik uji t. Hasil penelitian ini menunjukkan bahwa terdapat pengaruh yang signifikan terhadap peningkatan yang signifikan kemampuan berpikir kreatif matematis siswa setelah diterapkan model Inkuiri Alberta. Setelah dibandingkan, peningkatan kemampuan berpikir kreatif matematis siswa yang diterapkan model Inkuiri Alberta lebih baik daripada siswa yang diterapkan model pembelajaran konvensional. Pelaksanaan pembelajaran dengan menggunakan model Inkuiri Alberta telah sesuai dengan sintaknya.
PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE STUDENT TEAMS ACHIEVEMENT DIVISION (STAD) DAN TIPE NUMERED HEAD TOGETHER (NHT) TERHADAP PENGUASAAN KONSEP MATEMATIKA
Authors: Lutvaidah Ukti , Hidayat Ryan , Santosa Prima Pantau Putri
Published: March 2024

Tujuan penelitian untuk mengetahui perbedaan antara model pembelajaran kooperatif tipe Student Teams Achievement Division (STAD) dengan model pembelajaran kooperatif tipe Numered Head Together (NHT) terhadap penguasaan konsep matematika. Penelitian ini dilakukan di SMP Bina Sejahtera Depok dengan populasi kelas VIII di mana terdiri dari 2 kelas dan populasi tersebut juga sebagai sampel dengan jumlah rata-rata perkelasnya 30 peserta didik. Jenis penelitian ini adalah eksperimen dengan pendekatan kuantitatif.  Instrumen penelitian berupa soal essay sebanyak 4 soal dalam waktu 60menit. Instrumen dikatakan valid dan reabilitas setelah diuji cobakan di kelas uji coba. Uji prasyarat analisis menunjukan bahwa sampel berdistribusi normal dan homogen. Kesimpulan dari penelitian ini adalah terdapat perbedaan penguasaan konsep matematika antara siswa yang diajarkan menggunakan model pembelajaran kooperatif tipe Student Teams Achievement Division (STAD) dengan model pembelajaran kooperatif tipe Numered Head Together (NHT).
EFEKTIVITAS MODEL GUIDED DISCOVERY LEARNING BERBASIS ETNOMATEMATIKA TERHADAP KEMAMPUAN PEMAHAMAN KONSEP MATEMATIS
Authors: Melati Vina Rima , Umbara Uba
Published: March 2024

Penelitian ini dilatar belakangi oleh perhatian penulis yang menemukan bahwa kemampuan peserta didik dalam memahami konsep matematika masih rendah karena kesulitan mengerti dengan apa yang disampaikan oleh pendidik di kelas. Sehingga tujuan dari penelitian ini adalah untuk mengetahui efektifitas suatu model pembelajaran yaitu guided discovery learning berbasis etnomatematika terhadap kemampuan pemahaman konsep matematis peserta didik. Penelitian ini merupakan penelitian kuantitatif berbentuk Quasi-Eksperimental: Nonequivalent Control Group Design. Populasi dalam penelitian ini adalah peserta didik kelas VII SMPN 1 Cigugur dengan pemilihan sampel menggunakan teknik sampling jenuh yaitu kelas VII A dan VII B sebagai kelas eksperimen serta kelas VII C dan VII D sebagai kelas kontrol. Instrumen yang digunakan berupa tes kemampuan pemahaman konsep matematis berbentuk uraian yang dinyatakan telah memenuhi syarat validitas dan reliabel. Hasil uji hipotesis terhadap nilai N-Gain menggunakan uji beda diperoleh hasil bahwa peningkatan kemampuan pemahaman konsep matematis peserta didik yang menggunakan model guided discovery learning berbasis etnomatematika lebih tinggi dibandingkan dengan yang menggunakan model pembelajaran konvensional. Selanjutnya diharapkan model guided discovery learning berbasis etnomatematika dapat terus dikembangkan dan dijadikan sebagai salah satu alat untuk meningkatkan kemampuan pemahaman konsep matematis peserta didik.
ANALISIS RESILIENSI MATEMATIS SISWA KELAS X DI SMAN 1 DUKUPUNTANG PADA PEMBELAJARAN MATEMATIKA
Authors: Inayah Fifqi , Arief Agoestanto
Published: March 2024

Resiliensi matematis membutuhkan mentalitas yang kuat untuk mengatasi kekhawatiran, rasa takut menghadapi rintangan, dan kemahiran berbahasa. Siswa memiliki persepsi yang negatif terhadap matematika. Banyak siswa yang menganggap matematika sebagai mata pelajaran yang sulit dan membosankan. Persepsi yang negatif ini dapat menghambat siswa untuk mengembangkan resiliensi matematis. Tujuan dari penelitian ini untuk menganalisis tingkat resiliensi matematis siswa kelas X di SMAN 1 Dukupuntang. Metode yang digunakan pada penelitian ini yaitu metode deskriptif dengan pendekatan kuantitatif. Populasi dari penelitian ini adalah siswa kelas X di SMAN 1 Dukupuntang. Sampel dari penelitian ini yaitu salah satu siswa kelas X berjumlah 40 orang. Pemilihan sampel pada penelitian ini berdasarkan pada teknik random sampling. Instrumen penelitian yang digunakan adalah instrumen non tes, yaitu berupa angket berjumlah 28 butir pernyataan yang dapat ditanggapi oleh siswa melalui skala likert dengan rentang poin 1 sampai 4. Teknik analisis data dilakukan dengan analisis prosentase lalu dipaparkan secara deskriptif. Berdasarkan hasil analisis setiap pernyataan yang telah direspon siswa pada indikator diperoleh presentase yang menunjukkan bahwa tingkat resiliensi matematis siswa pada indikator 1 diperoleh persentase sebesar 49% tergolong kriteria cukup baik. indikator 2 diperoleh persentase sebesar 53% tergolong kriteria baik, indikator 3 diperoleh persentase sebesar 54% tergolong kriteria baik, indikator 4 diperoleh persentase sebesar 66% tergolong kriteria sangat baik, indikator 5 diperoleh persentase 55% tergolong kriteria baik, indikator 6 diperoleh persentase sebesar 45% tergolong kriteria cukup baik.
Cell-free DNA from nail clippings as source of normal control for genomic studies in hematologic malignancies
Authors: Krystel-Whittemore Melissa , Petrova-Drus Kseniya , Ptashkin Ryan N. , Ewalt Mark D. , Yao JinJuan , Liu Ying , Zhu Menglei , Benhamida Jamal , Durham Benjamin , Kumar Jyoti , Nafa Khedoudja , Kiecka Iwona , Bowman Anita S. , Gedvilaite Erika , Casanova Jacklyn , Lin Yun-Te , Mohanty Abhinita S. , Rana Satshil , Rema Anoop Balakrishnan , Rijo Ivelise , Chaves Nelio , Salazar Paulo , Yun Anita , Lachhander Sean , Wang Wei , Haque Mohammad S. , Xiao Wenbin , Roshal Mikhail , Giralt Sergio , Salles Gilles , Rampal Raajit , Stein Eytan M. , Perales Miguel-Angel , Horwitz Steven , Jakubowski Ann , Ponce Doris , Markova Alina , Birsoy Ozge , Mandelker Diana , Mantha Simon , Dogan Ahmet , Benayed Ryma , Ladanyi Marc , Berger Michael F. , Brannon A. Rose , Zehir Ahmet , Vanderbilt Chad , Arcila Maria E.
Published: March 2024

Comprehensive genomic sequencing is becoming a critical component in the assessment of hematologic malignancies, with broad implications for patients’ management. In this context, unequivocally discriminating somatic from germline events is challenging but greatly facilitated by matched analysis of tumor:normal pairs of samples. In contrast to solid tumors, in hematologic malignancies conventional sources of normal control material (peripheral blood, buccal swabs, saliva) could be highly involved by the neoplastic process, rendering them unsuitable. In this work we describe our real-world experience using cell-free DNA (cfDNA) isolated from nail clippings as an alternate source of normal control material, through the dedicated review of 2,610 tumor:nail pairs comprehensively sequenced by MSK-IMPACT-heme. Overall, we found that nail cfDNA is a robust germline control for paired genomic studies. In a subset of patients, nail DNA may be contaminated by tumor DNA, reflecting unique attributes of the hematologic disease and transplant history. Contamination is generally low level, but significantly more common among patients with myeloid neoplasms (20.5%; 304/1,482) than among those with lymphoid diseases (5.4%; 61/1,128) and particularly enriched in myeloproliferative neoplasms with marked myelofibrosis. When identified in patients with lymphoid and plasma-cell neoplasms, mutations commonly reflected a myeloid profile and correlated with a concurrent/evolving clonal myeloid neoplasm. Donor DNA was identified in 22% (11/50) of nails collected after allogeneic stem-cell transplantation. In this cohort, an association with a recent history of graft-versus-host disease was identified. These findings should be considered as a potential limitation to the use of nails as a source of normal control DNA but could also provide important diagnostic information regarding the disease process.
Implicaciones de la infección por SARS-CoV-2 en el sistema endocrino
Authors: Zabala Cárdenas Erick Roberto , López Moya Andrea Gabriela
Published: March 2024

Introducción: La infección por Coronavirus (COVID-19) ha sido un problema de salud pública desde su inicio en el año 2020 en Wuhan, China. Su principal vía de entrada celular es la enzima convertidora de angiotensina 2 (ACE2). A pesar de que el pulmón es el principal órgano perjudicado por su elevada concentración de ACE2, también existe dicha enzima en órganos endocrinos, provocando alteraciones en dicho sistema hormonal. Objetivo: Efectuar una revisión sistemática sobre las implicaciones de la infección por SARS CoV-2 en el sistema endocrino. Metodología: Estudio no experimental, descriptivo, se realizó una búsqueda sistemática sobre la influencia del SARS-CoV-2 en el sistema endocrino desde enero del año 2020 hasta agosto del año 2023. Resultados: Algunas estructuras del sistema endocrino son susceptibles a la infección por SARS-CoV-2 como la hipófisis anterior, debido a que se ubica fuera de la barrera hematoencefálica, otras zonas afectadas como la glándula tiroides presenta susceptibilidad por sus altas concentraciones de ACE 2 y también se ha observado mayor grado de severidad en pacientes sin timo porque aumenta la probabilidad de aparición de neumonía. Conclusión: Existe una relación entre la gravedad de dicha infección viral y la disminución de las concentraciones hormonales séricas de TSH, T3, T4. Área de estudio general: Medicina. Área de estudio específica: Medicina Interna. Tipo de estudio:  Revisión Bibliográfica.
Application of Flipped Classroom to Improve Learning Outcomes in Redox Reaction Lesson
Authors: Zai Lestari Kurniawati , Listyarini Risnita Vicky
Published: March 2024

The present study assesses the effectiveness of the flipped classroom learning model in enhancing the learning outcomes of 10th-grade students in the subject of redox reaction concepts. A quasi-experimental design was employed using a one-group pretest-posttest approach. The samples of 20 students were selected through purposive sampling. Data were collected through learning outcome tests, performance assessments on worksheets (LKPD), learning performance observations, and response questionnaires. Descriptive analysis and N-Gain techniques were used to analyze the data.The results of the study indicate that the flipped classroom learning model had a positive effect on the students' learning outcomes, as reflected by an average N-Gain of 0.56 and 0.62 with a medium criteria in the first and second meetings, respectively. The students' performance on LKPD showed an average percentage of 91.5% and 97.5% categorized as excellent in the first and second meetings, respectively. Observations showed that the students' learning performance improved by 51% (first) to 78% on the second meeting. The students' responses to the application of the flipped classroom learning model were positive, with an average percentage of 72.1%. The findings of this study suggest that the flipped classroom learning model can be an effective alternative learning model, particularly in the teaching of redox reaction concept material.
Development of Android-Based Chemistry Virtual Laboratory Media on Acid-Base Materials for 11th Grade High School Students
Authors: Muslim Firda Elfiana , Ardhana Ivan Ashif
Published: March 2024

This study aimed to develop an Android-based virtual laboratory media for chemistry, assess its validity, and determine students' responses to it. The research methodology employed was research and development (R&D) with the 4D development model (Four D Models) according to Thiagarajan, which comprises four stages: define, design, develop, and disseminate. The study was carried out until the development stage. The research instruments used included interview guides, validation sheets, and questionnaires. The media products developed were validated by material and media expert validators consisting of two chemistry lecturers and one chemistry teacher. Limited trials were conducted with a total of 32 11th grade students from Mathematics and Science (MIPA) 3 class at State Islamic Senior High School (MAN) Blitar City. Data analysis techniques involved both qualitative and quantitative methods. The results indicate that the validation scores from the material and media experts were very valid, with an average percentage score of 98% and 95%, respectively. The student's responses to the limited trials were also very good, with an average percentage score of 88%. Overall, the study demonstrated the potential of the developed Android-based virtual laboratory media for chemistry education.
Inhibition of α-Glucosidase Enzyme by Ethanol Extract of Kratom Leaf Variant (Mitragyna speciosa Korth.)
Authors: Wijayanti Dinda Kartika , Masriani Masriani , Fadly Dzul , Muharini Rini , Rasmawan Rahmat
Published: March 2024

Diabetes melitus yang ditandai dengan hiperglikemia akut telah menjadi epidemi di seluruh dunia. Salah satu tumbuhan di Indonesia yang memiliki potensi empiris sebagai antidiabetes adalah kratom (Mitragyna speciosa Korth.). Ada 3 jenis varian kratom yang banyak digunakan oleh masyarakat yaitu varian kratom hijau, merah, dan putih. Varian ini dibedakan dengan adanya urat pada daun kratom. Namun penelitian antidiabetes dengan mekanisme penghambatan enzim α-glukosidase dari daun kratom varian merah, hijau, dan putih belum banyak diteliti. Penelitian ini bertujuan untuk mengetahui aktivitas penghambatan enzim α-glukosidase oleh Ekstrak Etanol Daun Kratom (Mitragyna speciosa Korth.)Berbagai varian. Serbuk tiga varian daun kratom dimaserasi dengan etanol 96% selama 72 jam, dan penghambatan aktivitas enzim α-glukosidase menggunakan ekstrak etanol dan akarbose sebagai kontrol positif. Pengujian in vitro dilakukan dengan menggunakan alat microplate reader dengan panjang gelombang 405 nm. Ekstrak etanol daun kratom varian merah, hijau, dan putih 96% pada konsentrasi 500 μg/ml dapat menghambat aktivitas enzim α-glukosidase masing-masing sebesar 10,57%, 13,06%, dan 5,33%. Hal ini menunjukkan bahwa ketiga varian kratom tersebut memiliki aktivitas sebagai penghambat enzim α-glukosidase namun tergolong sangat lemah, dengan IC50>200 μg/ml. Aktivitas penghambatan ketiga ekstrak berbeda nyata (p<0,05). Perbedaan ini mungkin disebabkan oleh kandungan metabolit sekunder pada masing-masing varian kratom.
Sustainable Energy Cyclic System: Massive Operation and Integrated System for Optimizing Renewable Energy Sources
Authors: Rahmawati Ratri , Faris Muhammad , Ibrahim Muhammad , Budiman Nita Andriyani , Wibowo Rianto , Winarso Rochmad
Published: March 2024

Energy as basic need for life indeed face crisis of scarcity. Yet, the idea of using renewable energy becomes popular for example hydropower, solar energy, side product (i.,g biomass and domestic waste) that have been introduced. Each of them have advantages and found reliable to be implemented. Ascribe to the concept of law conservation of energy, these potentials can be integrated and be optimized to create energy cyclic system. Hence, this study introduces the concept of sustainable energy cyclic system by accommodating several resources namely hydropower, human side products, biomass and solar energy. This study used comprehend data which then analysed to purpose the idea. Data were collected and were projected to the focus of study. It is addressed to create systematic system of energy yet hampering energy crisis. This study shows that the idea to generate sustainable energy cyclic is reliable in which it compiles each of potential and integrates into systematic system. Moreover, the energy cyclic provides the sustainable solution facilitated by abundant resources such as human side product, biomass, hydropower, solar power, and salinity gradient energy.
Meningkatkan Hasil Belajar Peserta Didik dengan Model Discovery Learning pada Materi Ikatan Kimia
Authors: Sariwati Lathifah Nur'aini , Sunaryo Agus , Sukarmin Sukarmin
Published: March 2024

This study aims to improve student learning outcomes with the Discovery Learning learning model on chemical bonding material for class X-6 SMAN 2 Ponorogo. This research is a Classroom Action Research (PTK) which consists of three cycles. This cycle in PTK uses the Lesson Study format which includes planning (Plan), implementation (Do), and reflection (See). Data collection techniques include test techniques in the form of knowledge aspect tests, while the non-questionnaire technique is peer assessment and observation. In this study, student learning outcomes cover 3 aspects, namely aspects of knowledge, attitudes and skills. The learning outcomes of students in the knowledge aspect in cycle I amounted to 47.2% increasing to 67% in cycle II then in cycle III increasing to 86%. While the learning outcomes of students in the attitude aspect in cycle I had an average of 3.13 in cycle I increased to 3.28 in cycle II then in cycle III an average of 3.43 was obtained. The learning outcomes of students in the skills aspect in cycle I obtained an average of 3.03 and increased in cycle II of 3.28 then in cycle III the average increased to 3.35. The conclusion of this study shows that student learning outcomes increase by using the Discovery Learning learning model.
Student Worksheet Oriented on Assessment for Learning to Improve Learning Outcome on Acid Base Titration
Authors: Pratama Danang Putra , Muchlis Muchlis
Published: March 2024

This study aims to obtain student worksheet that can improve learning outcomes on acid-base titration material. The research method used in this research is the Research and Development (R&D) model of Borg and Gall with three steps, namely preliminary studies, development studies, and limited trials. The limited trials employed a one group pretest-posttest design. Data are derived from a validity score based on the mode, a practicality score derived from the student responses questionnaire results, and an effectiveness score derived from the results of the pretest, posttest 1, and posttest 2, which were analyzed by a parametric statistical test using the sample paired t-test. According to the study's findings, the validity mode was obtained score ≥ 3 on each aspect, a practicality score of 98,14% and a significance of the t test obtained 0.000 in the first t-test and 0.000 in the second t-test, so that Student worksheet oriented on assessment for learning can be deemed feasible for raising student learning outcomes for the subject for acid-base titration. The presence of assessment for learning and feedback provided in student worksheet makes students active and can improve student learning outcome on acid base titration material.
Validity of Digital Comics to Train Metacognitive Skills on Thermochemical Materials
Authors: Choiriyah Hasna , Hidayah Rusly
Published: March 2024

The purpose of this study was to determine the validity of digital comics to train students' metacognitive skills on thermochemical material seen from content and construct validation. The novelty of this research is to develop digital comics that have metacognitive components. The research subjects were high school students grade XI. The data used in the pre-research was from 30 students of class XI from one of the state high schools in Magetan. This research uses research and development (R&D) procedures with the ADDIE method, namely analyze, design, develop, implement, and evaluate. But only up to the development stage to find out the validation of digital comics. The instruments used in this study used digital comic review sheets filled in by reviewers and digital comic validation sheets filled in by experts, namely two chemistry lecturers and one chemistry teacher. Based on the results of validation by experts, it shows that the digital comics developed obtained mode 4 for content validation with a valid category, and obtained mode 4 for construct validation to obtain a valid category. Based on the validation results, the developed digital comics can be said to be valid for use as learning media to train students' metacognitive skills.
Development of Student Worksheets Problem Solving Oriented to Train Metacognitive Skills Students Grade XI on Acid Base Materials
Authors: Rizqiyah Dian Zulfatur , Azizah Utiya
Published: March 2024

This study aimed to describe the feasibility of student worksheets with problem solving oriented to train metacognitive skills on acid base material. The feasibility of student worksheets developed in terms of aspects, namely validity, practicality, and effectiveness. The type of this research used Borg and Gall Research and Development (R&D), and the design of this research used one group pretest-posttest design with the objects are 24 students on 11th grade in science 2 of SMAN 1 Dawarblandong. The results showed that the student worksheets were declared feasible of the validity, practicality, and effectiveness. The validity was measured by the content and construct validation sheets. The practicality was measured by the students’ responses and average observation of students’ activities. The effectiveness was measured by pretest-posttest of metacognitive skills, knowledge domain test, and supported by the metacognitive inventory questionnaire. The percentage of content validity from each students’ worksheets is 87,78%. Construct validity obtained a percentage from each students’ worksheets is 86,67%. The results of students' responses obtained an average percentage of 94,00% in the very practical category and was supported by the results of observations of students' activities by obtaining the percentage of relevant activities at meetings 1, 2, and 3 respectively 93.32%; 93.32%; and 96.65%. The results of students' metacognitive skills tests increased with a range of N-gain scores of 0.67 to 1.00 in the medium to high category. The knowledge domain test increased  with a range of N-gain scores of 0.67 to 1.00 and was supported by the results of the metacognitive inventory questionnaire which obtained an average of 84.53 in the very good category. Based on the three aspects of the feasibility of the students’ worksheets above, it can be concluded that the problem solving oriented to train students' metacognitive skills in acid-base material is feasible to use.
Implementation of the PBL-STEM Model to Improve Students' Critical Thinking on Reaction Rate Material
Authors: Ata Putri Fritami , Rahmadani Agung , Erika Farah
Published: March 2024

The application of PBL-STEM can encourage students to be independent in the learning process and emphasize the process of thinking critically and analytically to seek and find answers to a problem in question. This study used a true–experimental design with the Posttest Only Control Design type. The population in this study were all students of class XI SMA Kristen Sunodia Samarinda for the academic year 2022/2023 divided into 2 classes. This study aims to determine the effect of PBL-STEM in improving students' critical thinking skills. Sampling was done by cluster random sampling technique. The instruments used to measure students' critical thinking skills in chemistry were post-test questions, teacher and student observation sheets, and student response sheets (questionnaire). Data analysis was performed by t-test. The results of the t-test with Mann-Whitney obtained sig. (2-tailed) in both classes is 0.00 <0.05, it is concluded that Ha accepted the statement that there is an effect of the application of PBL-STEM on the critical thinking skills of class XI students at Christian Senior High School Sunodia Samarinda regarding reaction rates. The results of the teacher and student activity sheets in the experimental class were both in very good categories, as well as the student response to PBL-STEM learning, namely 77.2% of students agreed with the application of PBL-STEM in learning which can train students' critical thinking skills. This research discusses the analysis of how effective the influence of PBL and STEM integration is to improve critical thinking skills on reaction rate material so that this research can be used as a reference for applying PBL-STEM to other chemistry topics.
Science Literacy-Based Student Worksheets to Improve Critical Thinking Skills on Acid-Base Materials
Authors: Fatmawati Eka Haslinda , Rusmini Rusmini
Published: March 2024

The goal of this study was to find out the eligibility of science literacy-based student worksheets to improve learners critical thinking skills on acid-base materials. The eligibility of the developed science literacy-based student worksheets viewed from validity, practicality, and effectiveness. This type of study uses Research and Development (R&D) with a 4D research model. This study model consists of the define, design, and limited to develop stages. The validity of science literacy-based student worksheets based on content criteria obtained a percentage of 37.50% (valid) with mode 3 and 62.50% (very valid) with mode 4. On the construction criteria, obtain a percentage of 15.15% (valid) in mode 3 and 84.85% (very valid) in mode 4. The practicality of the student worksheet was viewed from the responses and observations of learner activities, which earned a percentage of 97.10% and 90% with very practical criteria. The effectiveness of the student worksheet received highly effective criteria viewed from the N-gain score of science literacy of 0.75 (high), and critical thinking skills obtained a N-gain score of 0.71 (high). This is corroborated by the Wilcoxon statistical test of science literacy and critical thinking skills, which revealed a disparity between learners' capability for science literacy and critical thinking skills prior to and following the use of science literacy-based student worksheets, with a sig. (2-tailed) of 0.000. The Spearman correlation test resulted in a correlation coefficient of 0.754, indicating a significant association between science literacy and critical thinking skills, with a classical completeness of 89%. So, based on this research, science literacy-based student worksheets are declared eligible to improve learners thinking skills.
The Analysis of Chemistry Test Item Difficulty on XI MIPA Year-End Assessment at SMAN 8 Pontianak
Authors: Dewi Pitra , Hairida Hairida , Rasmawan Rahmat , Masriani Masriani , Junanto Tulus
Published: March 2024

This study aims to categorize the level of difficulty of the questions and describe the cognitive level of the KKO indicators of the 2021/2022 year-end assessment (PAT) of chemistry class XI MIPA at SMAN 8 Pontianak. This research is quantitative descriptive. Data collection techniques were interviews and documentation. Documentation was obtained from chemistry teachers through google forms containing answers and PAT questions. The research subjects amounted to 150 students of class XI MIPA who had taken the End of Year Assessment. The results of the research obtained are difficult categories totaling 4 questions (13.3%), moderate 10 questions (33.3%) and easy 16 questions (53.4%). The results of the analysis obtained in order to improve the distribution of the difficulty level of questions in the future.
Ethno-chemistry: Relevance Analysis of Electron Valence Subject Material to Sasak Local Wisdom as a Chemistry Learning Resource
Authors: Umam Kholid Khairul , Wahyudiati Dwi
Published: March 2024

The lack of learning resources in the form of teaching materials is one of the problems found in the chemistry learning process, both within the scope of high schools and universities so that the development of contextual teaching materials is very important to do as an implementation of the ethno-chemistry approach in education. The purpose of this research is to explore and reveal the wisdom or local wisdom of the Sasak community, which is developed into teaching materials. This research approach uses a qualitative approach with data collection techniques using interviews, literature studies and documentation methods. A qualitative research approach with interview techniques, literature studies, and documentation methods was used to collect information in the form of individual views, theoretical understandings, and historical data related to the research topic, with the aim of gaining in-depth insights, contextual understanding, and theoretical support needed in the analysis and explanation of the phenomenon under study. The data obtained Analyze by Miles and Huberman qualitative analysis. Research subjects include community leaders, chemical content experts, and reading books relevant to the research. Based on the research findings. It is concluded that Sasak Begibung Culture can be used as a source of learning chemistry through integrating Sasak Begibung culture with valence electron material. Thus, the implementation of this research can be used as a reference in the development of contextualized chemistry teaching materials so that lessons become more meaningful and effective.
Decoding The Obstacles of 10th Grade Student Learning in Atomic Structure at SMAN 1 Sungai Tarab
Authors: Nadila Mutiara , Mawarnis Elvy Rahmi
Published: March 2024

This research uses qualitative research methods (descriptive). The subjects of this research were 10th grade students of Phase E.8 with a total of 28 students. Based on the research that has been done, it can be concluded that the results of the analysis of the types of learning difficulties and the factors that cause chemistry learning difficulties in 10th Grade students of atomic structure material at State Senior High School (SMAN) 1 Sungai Tarab are as follows. First, the types of chemistry learning difficulties consist of 3 types of difficulties including difficulty understanding terms with the highest percentage of 67.86% on the term atomic symbol, difficulty understanding concepts with the highest percentage of 67.86% on the concept of atomic structure according to Thomson and difficulty understanding numbers with the highest percentage of 64.28% on calculations or numbers looking for the number of values of atomic constituent particles (ions). Second, the factors causing chemistry learning difficulties consist of 2 factors, namely internal factors which include physical factors with a percentage of 32.14%, psychological factors with a percentage of 82.14% and emotional factors with a percentage of 71.43%, and external factors which include family factors with a percentage of 25%, school factors with a percentage of 35.71% and community factors with a percentage of 28.57%.
Higher Order Thinking Skills and Visual Representations of Chemical Concepts: A Literature Review
Authors: Basimin Mudzuna Quraisyah , Habiddin Habiddin , Joharmawan Ridwan
Published: March 2024

Efforts to assist students in understanding generally abstract chemical concepts are widely done using visual representations as a form of multiple representations in chemistry. This article evaluates and identifies articles from the year (2013-2023) through search engines that provide international services and national journal pages that can be accessed using 4 databases, namely, science direct, eric, google scholar, and crossref. Based on predefined criteria for the use of visual representation in chemistry to improve Higher Order Thinking Skills, 13 relevant articles were obtained. The results of the review show that visual representation can be utilized to train and improve higher-order thinking skills, especially critical, logical, reflective, metacognitive, and creative thinking. Visual representation has also been applied to several approaches or learning models such as Multiple Representation, Particulate Representation, 5R, SWH, Marzano's Taxonomy, Use of Concept Maps, and PcBL.
Feasibility of Natural Indicators Worksheets for 11th grade Student
Authors: Al Mu’min Muhammad Ridhwan , Hairida Hairida , Masriani Masriani
Published: March 2024

This study aims to determine the level of eligibility of worksheets for natural indicators of acid-base 11th grade Senior High School (SMA/MA) students in even semester. The population used in this study is a population sample consisting of six validators consisting of two content validator validators, two linguistic validator validators, and two graphic feasibility validators. Data collection instruments used were content eligibility questionnaire, linguistic feasibility questionnaire, and graphic eligibility questionnaire. The data analysis technique used is Gregory. Results Processing data in terms of content eligibility has a validity of 1 so that it has a very high level of content eligibility. For language eligibility, continued validity is obtained at 1 so that the level of language eligibility is also very high. However, the validity of the worthiness of the graphic is only 0.5 so that the level of feasibility of the graphic is still categorized as moderate. Thus, it can be concluded that LKPD of the natural indicators of acid-base for 11th grade students in even semester is feasible to be used in the learning process with very high criteria for content and linguistic aspects and moderate categories for graphic aspects.
Development of Android-Based Marbles Chem Hydrocarbon Mobile Game Media to Improve Motivation and Learning Outcomes of 11th Grade Science Students
Authors: Muhidah Izzatul , Agustini Rudiana
Published: March 2024

One of the uses of ICT in the world of education can be in the form of game media because students are actively involved in learning so that it can increase motivation. Learning outcomes are related to motivation, if the motivation given is more appropriate, the more successful the learning will be. This study aims to obtain feasible Marbles Chem Hydrocarbon media to increase student motivation and learning outcomes based on three aspects, namely validity, practicality, and effectiveness. The research method used is research and development / Research and Development (R&D) adaptation from Plomp (2013), consisting of three phases, namely the Preliminer Phase, the Prototype Making Phase, and the Evaluation Phase. Limited trials were conducted in 11th Grade Science (MIPA) of State Senior High School (SMAN) 20 Surabaya. Validity is obtained from three validators. Practicality is obtained from the results of response questionnaires, observation of student activities, and the implementation of learning. effectiveness is obtained from ARCS motivation questionnaire sheets and student learning outcomes. Media validity on content validity and construct validity barada in the range of scores 4 and 5 with valid and very valid criteria. Practicality is reviewed based on observations of learning implementation, student response questionnaires, and observations of student activities with an average percentage of 98.47%, 96.98%, and the results of observations of relevant activities are greater than irrelevant activities, namely 205.16 > 6.43. The effectiveness of the media obtained pretest-posttest increased from 60 incomplete categories to 87.69 complete categories and the ARCS motivational questionnaire increased from 55.32 with the moderately effective category to 95.85 very effective categories. Based on the results of validity, practicality and effectiveness, Marbles Chem Hydrocarbon media is suitable to be used as a learning medium on Hydrocarbon material.
Design of Augmented Reality Integrated Learning Applications on Acid and Base Subject Material for F Phase Students
Authors: Rahmadani Sri , Guspatni Guspatni
Published: March 2024

The aim of this research is to create integrated augmented reality learning media in the form of an application that focuses on the acid base material in the F phase or senior high school phase. Along with the development of the world of education, various kinds of new learning media have emerged. One of the interesting technologies that can currently be developed on Android is Augmented Reality (AR). Augmented Reality is considered one of the most advanced technologies in virtual reality research and is effective as a learning medium, especially chemistry. Augemented Reality is a technology that combines the real world with a computer-generated virtual world so that the boundaries between the two worlds are very minimal. Because of its advantages, AR can be used to create learning applications that can support the teaching and learning process. One lesson that can utilize this technology is chemistry learning about acids and bases. This application was created with Blender 3D software to create 3D acid base objects, Easy AR and Unity 3D to build applications. This media design was adopted by the Plomp development media. Where the design of this media is in accordance with the needs of schools which expect learning media to contain animation and be guided by questions that can guide students in discovering concepts. It is hoped that this learning application can be used at school and outside school as a support in learning chemistry, especially acids and bases.
Penerapan Model Pembelajaran Team Based Learning untuk Meningkatkan Keterampilan Abad 21 bagi Mahasiswa Calon Guru Kimia
Authors: Junanto Tulus , Sartika Rody Putra
Published: March 2024

Pendidikan abad 21 memerlukan keterampilan dunia nyata yaitu komunikasi, kolaborasi dan berfikir kritis. Model pembelajaran Team Based Learning (TBL) memberikan banyak kesempatan kepada mahasiswa untuk mengembangkan kemampuan bekerjasama. Tujuan yang ingin dicapai dalam penelitian ini adalah a) mendeskripsikan penggunaan model pembelajaran TBL untuk meningkatkan keterampilan abad 21 bagi mahasiswa calon guru kimia, b) mendiskripsikan prosedur pelaksanaan kegiatan model pembelajaran TBL untuk meningkatkan keterampilan abad 21 bagi mahasiswa calon guru kimia. Metode penelitian ini adalah jenis penelitian kualitatif dengan pendekatan deskriptif. Hasil penelitian adalah a) implementasi model pembelajaran TBL dapat meningkatkan keterampilan abad 21 bagi mahasiswa calon guru kimia dengan cara berkolaborasi, aktif berkomunikasi, berpikir kritis dan kreatif selama proses pembelajaran, b) prosedur pelaksanaan kegiatan model pembelajaran TBL untuk meningkatkan keterampilan abad 21 bagi mahasiswa calon guru kimia yaitu pra-kelas, Readiness Assurance Process (RAP), Application of Course Concepts , instructor feedback.
The Effect of Different Extraction Methods on Total Tannin Content of Methanol Extract of Simpur Air Leaves (Dillenia suffruticosa)
Authors: Wahyuni Sri , Masriani Masriani , Sasri Risya , Sapar Ajuk , Erlina Erlina , Ersando Ersando
Published: March 2024

The use of metal mordants in fabric dyeing can harm the environment and health, so it is necessary to look for natural mordants that are more environmentally friendly. The utilization of Simpur Air leaves (Dillenia suffruticosa) as a biomordant is one of the efforts to produce a more environmentally friendly tannin mordant. D. suffruticosa has been reported to contain tannin compounds in all parts of the plant. However, scientific evidence of differences in the total tannin content of methanol extracts of D. suffruticosa leaves with various extraction methods have not been found so far. This study aims to determine the effect of different extraction methods on the yield value and total tannin content of methanol extracts of D.suffruticosa leaves using UV-Vis spectrophotometric method at a wavelength of 755.8 nm with Folin Ciocalteau reagent. D. suffruticosa leaves are extracted by using three methods, namely maceration, soxhletation and reflux. Tannic acid is used as a comparator. The results show that the yield value of D. suffruticosa leaves extracted by maceration, soxhletation and reflux methods were 8.35%; 12.26%; and 25.24%, respectively. The total tannin content of methanol extract of D. suffruticosa leaves with maceration method is 0.15% ± 0.007; soxhletation is 0.18% ± 0.007 and reflux is 0.21% ± 0.016.  Based on the results of the data analysis, the significance value <0.05 was obtained. It can be concluded that the extraction method affects the yield value and total tannin content of methanol extract of D. suffruticosa leaves.