bluuebunny/crossref_metadata_2025_split huggingface dataset:
Treatment of Pb(II) Metal in Wastewater Using Combination Method of Electrocoagulation − Activated Carbon Adsorption
Authors: Setiawan Adhi , Ramadani Tarikh Azis , Hanastasia Rizka Lutfita 
Published: August 2020

Metal Pb(II) is one of the pollutants that causes water pollution and impacts ecosystem damage. Pb(II) metal waste is toxic and biomagnification, so it harms human health. The combination of electrocoagulation and adsorption processes is an efficient and effective alternative in removing Pb(II) metal in wastewater. In this study, the wastewater treatment process is carried out in batch using electrocoagulation with aluminum electrodes and followed by activated carbon adsorption. This research aimed to analyze the effect of electrical voltage in electrocoagulation, adsorption time, and adsorbent dose on reducing Pb(II) concentration. Electrocoagulation and adsorption processes were used variations of electrical voltage (10, 20, 30 V), adsorption times (15, 30, 45 minutes), and adsorbent doses (2,5, 3,3, 4,1, 5 g/L). The research showed that the combination of electrocoagulation and adsorption could significantly reduce Pb(II) concentration in wastewater. Increased electrical voltage, adsorption time, and adsorbent dose lead to increased Pb(II). The maximum removal efficiency of Pb(II) metal was obtained under voltage of 30 V, 45 minutes adsorption time, and 5 g/L adsorbent dose. This condition resulted in removal efficiency Pb(II) of 96,01%.
Factors Contributing to Diurnal Variation in Athletic Performance and Methods to Reduce Within-Day Performance Variation: A Systematic Review
Authors: Kusumoto Hirofumi , Ta Canhnghi , Brown Symone M. , Mulcahey Mary K. 
Published: August 2020

Abstract
Kusumoto, H, Ta, C, Brown, SM, and Mulcahey, MK. Factors contributing to diurnal variation in athletic performance and methods to reduce within-day performance variation: A systematic review. J Strength Cond Res 35(12S): S119–S135, 2021—For many individuals, athletic performance (e.g., cycle ergometer output) differs based on the time of day (TOD). This study identified factors contributing to diurnal variation in athletic performance and methods to reduce TOD performance variation. Comprehensive searches of PubMed, Ovid, EMBASE, Web of Science, and Cochrane Libraries were conducted in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Peer-reviewed publications reporting quantitative, significant diurnal variation (p ≤ 0.05) of athletic performance with explanations for the differences were included. Studies providing effective methods to reduce diurnal variation were also included. Literature reviews, studies involving nonhuman or nonadult subjects, studies that intentionally manipulated sleep duration or quality, and studies deemed to be of poor methodological quality using NIH Quality Assessment Tools were excluded. Forty-nine studies met the inclusion criteria. Body temperature differences (n = 13), electromyographic parameters (n = 10), serum biomarker fluctuations (n = 5), athlete chronotypes (n = 4), and differential oxygen kinetics (n = 3) were investigated as significant determinants of diurnal variation in sports performance. Successful techniques for reducing diurnal athletic performance variability included active or passive warm-up (n = 9), caffeine ingestion (n = 2), and training-testing TOD synchrony (n = 3). Body temperature was the most important contributor to diurnal variation in athletic performance. In addition, extended morning warm-up was the most effective way to reduce performance variation. Recognizing contributors to diurnal variation in athletic performance may facilitate the development of more effective training regimens that allow athletes to achieve consistent performances regardless of TOD.
Effects of 10 Months of Speed, Functional, and Traditional Strength Training on Strength, Linear Sprint, Change of Direction, and Jump Performance in Trained Adolescent Soccer Players
Authors: Keiner Michael , Kadlubowski Björn , Sander Andre , Hartmann Hagen , Wirth Klaus 
Published: August 2020

Abstract
Keiner, M, Kadlubowski, B, Sander, A, Hartmann, H, and Wirth, K. Effects of 10 months of speed, functional, and traditional strength training on strength, linear sprint, change of direction, and jump performance in trained adolescent soccer players. J Strength Cond Res 36(8): 2236–2246, 2022—The current study aimed to compare the effects of plyometric and sprint vs. functional vs. strength training on linear sprint (LS 20 m), change of direction (COD; i.e., turning right and left), jump (squat jump [SJ]), and maximum strength (1 repetition maximum [1RM] for a squat) performance in elite adolescent soccer players. A longitudinal design was chosen, and 48 elite male youth were recruited. The athletes were divided into 4 groups (a traditional strength training group [STG], a plyometric and sprint training group [PSTG], a functional training group [FTG], and a control group [CG]). The intervention groups trained for 10 months with additional sessions added to their regular soccer training (4–5 sessions per week); the additional training (2 sessions a week [each about 60 minutes]) consisted of plyometric and sprint training, functional training, and traditional strength training for the PSTG, FTG, and STG, respectively. Data were analyzed using analysis of variance with repeated measurements. The effect sizes were calculated using Hedges g. This study showed significantly superior performance increases with traditional strength training compared with sprint and jump training and functional training for maximum strength (compared with all other groups g = 0.98–1.61), SJ (g = 0.52–0.87 compared with FGT and CG; not significantly different from PSTG), COD (direction of rotation right: compared with all other groups g = 1.58–2.12; direction of rotation left: no significant differences), and 20-m LS (compared with all other groups g = 0.86–1.39) performance over time. Traditional strength training is recommended to increase strength and speed-strength variables and should therefore be given high priority in athletic training programs for elite youth soccer players.
Positional Body Composition of Female Division I Collegiate Volleyball Players
Authors: Bisch Katie L. , Bosch Tyler A. , Carbuhn Aaron , Stanforth Philip R. , Oliver Jonathan M. , Bach Christopher W. , Dengel Donald R. 
Published: August 2020

Abstract
Bisch, KL, Bosch, TA, Carbuhn, A, Stanforth, PR, Oliver, JM, Bach, CW, and Dengel, DR. Positional body composition of female division I collegiate volleyball players. J Strength Cond Res 34(11): 3055–3061, 2020—The primary study objective was to measure positional differences in total and regional body composition among female NCAA Division I collegiate volleyball players using dual X-ray absorptiometry (DXA). The secondary objective was to examine normative age curves for fat and lean mass (LM) variables. Ninety female volleyball players from 5 universities received a DXA scan. Athletes were categorized by position: middle blocker (MB = 31), outside hitter (OH = 32), setter (ST = 9), and Libero (LB = 18). Height, body mass, total and regional fat mass (FM), LM, bone mineral density (BMD), and abdominal visceral adipose tissue were measured by DXA. Body mass distribution ratios were calculated. The secondary age analysis included a subset of 153 DXA scans (n = 83, ages 18–21 years). Front row players (i.e., MB and OH) had significantly greater total and regional LM and BMD measures (p < 0.05, all), compared with non-front row players (i.e., LB and ST). Differences in total LM (p < 0.001) were significantly influenced by height. Front row players had consistently lower mass distribution ratios compared with non-front row players (p < 0.05, all). Lean mass index (LMI, p = 0.752) and FM index (FMI, p = 0.392) were not significantly different across ages. Back row players have greater relative upper body mass, whereas mass in front row players is more evenly distributed between the upper and lower body. Bone mineral density differences may be influenced by repeated impact of jumping during the attacking and blocking actions of front row players. Minimal changes in LMI and fluctuations in FMI can be expected across an athlete's career.
Transformative Learning for Controversial History of G 30 S/PKI
Authors: Hartono Yudi , Huda Khoirul 
Published: August 2020

G 30 S/PKI is a controversial issue in Indonesian history and a sensitive material because of past traumatic memories. It is a challenge for history teachers in learning in schools. This research aims to analyze the controversial history material of the G30 S/PKI in history textbooks in school and formulate the learning concepts that are relevant for the controversial history. This type of research is qualitative with the content analysis. The data source is the history textbook and any other sources appropriate. The results show that in the Indonesian History Book for grade XII, 7 (seven) versions of the theory of the G30 S/PKI are presented. The various versions need to be integrated into the substance of the G30 S/PKI incident material so that it reflects the balance in the construction of the content with its arguments and weaknesses. In learning, the concept of transformative learning that is directed at historical didactics based on academic history is needed. History learning introduces educational content to build awareness of values. Students are actively involved through cooperative learning accompanied by exploration activities related to G 30 S/PKI material. Learning is directed at active historical thinking that opens an open dialogue. In this way, the teaching of controversial material history has the potential for character education (critical, analytical, objective, open-minded) that relies on internalization to minimize indoctrination. G 30 S/PKI merupakan isu kontroversial dalam pembelajaran sejarah Indonesia dan materi yang sensitif karena memori traumatik masa lalu. Hal tersebut menjadi tantangan bagi para guru sejarah dalam pembelajaran di sekolah. Penelitian ini bertujuan untuk menganalisis materi sejarah kontroversial G 30 S/PKI dalam buku pelajaran sejarah di sekolah menengah atas dan merumuskan konsep pembelajaran yang relevan untuk materi sejarah kontroversial. Jenis penelitian kualitatif dengan analisis isi. Sumber data berupa buku teks sejarah di sekolah dan sumber lain yang relevan. Hasil penelitian menunjukkan bahwa dalam buku Sejarah Indonesia SMA kelas XII Kurikulum 2013 dipaparkan 7 (tujuh) versi teori tentang G 30 S/PKI. Berbagai versi tersebut perlu diintegrasikan ke dalam substansi materi sehingga mencerminkan keseimbangan dalam konstruksi materinya dengan argumentasi dan kelemahan-kelemahannya. Dalam pembelajaran diperlukan konsep pembelajaran transformatif yang diarahkan pada didaktik historis berbasis historis akademik. Pembelajaran sejarah mengintroduksi muatan-muatan edukatif untuk membangun kesadaran nilai. Siswa terlibat aktif melalui pembelajaran kooperatif yang disertai kegiatan-kegiatan eskplorasi materi G 30 S/PKI. Pembelajaran diarahkan pada active historical thingking yang membuka dialog terbuka. Dengan cara demikian, pembelajaran sejarah materi kontroversial potensial bagi pendidikan karakter (kritis, analitis, objektif, terbuka) yang bertumpu pada internalisasi untuk meminimaliasasi indoktrinasi.
The Business Ethics of Kotagede’s Silver Entrepreneurs from the Kingdom to the Modern Era
Authors: Birsyada Muhammad Iqbal , Permana Septian Aji 
Published: August 2020

The silver business since the reign of Sri Sultan HB VIII has gained its position in driving the economic progress of Kotagede’s people. The silver industry, besides its economic values, is also a cultural asset of the people of Yogyakarta. From 1935-1938, there were more than 78 silver entrepreneurs with a total annual production of 25 tons of silver. This study aims to determine and to analyze the history of the silver business in Kotagede and the values inherited from the kingdom period to the modern era. This research used the historical method by describing data on the development of silver business in Kotagede in a descriptive, chronological manner combined with a phenomenological approach. This research shows the success of the silver industry in Kotagede from the kingdom to the colonial era. It is supported by the collective power of the craftsmen community and silver entrepreneurs. It was also encouraged by the local government which helped to open the silver market network both at national and international levels. During the old order until the new order, the role of business actors in each founder of the silver business in building marketing networks both nationally and internationally became one of the main factors in running the silver industry in Kotagede. Third, the ethics inherited include honest, patient, simple, clean, neat, conscientious, healthy intentions, innovative, hard work. Bisnis perak sejak era pemerintahan Sri Sultan HB VIII telah mendapatkan posisi tersendiri dalam mendorong kemajuan ekonomi masyarakat Kotagede. Industri perak selain bernilai ekonomis tinggi dan potensial di pasar domestik maupun mancanegara juga menjadi aset budaya masyarakat Yogyakarta. Sejak 1935- 1938 terdapat lebih dari 78 pengusaha perak dengan total produksi tiap tahun 25 ton perak. Penelitian ini bertujuan mengetahui dan menganalisis sejarah perkembangan bisnis perak di Kotagede beserta nilai-nilai yang di wariskan dari era kerajaan sampai era modern. Penelitian ini menggunakan metode sejarah dengan memaparkan data-data perkembangan bisnis perak di Kotagede secara deskriptif, kronologis yang digabungkan dengan pendekatan fenomenologis. Penelitian ini menghasilkan beberapa temuan sebagai berikut. Pertama, kesuksesan perkembangan perak di Kotagede pada era kerajaan sampai kolonial selain ditopang oleh kekuatan kolektivitas komunitas pengrajin dan pengusaha perak juga didorong oleh pemerintah lokal yang membantu membuka jejaring pasar perak baik level nasional maupun internasional. Kedua, pada masa orde lama sampai orde baru peranan aktor-aktor bisnis pada masing-masing pendiri usaha perak dalam membangun jaringan pemasaran baik tingkat nasional maupun internasional menjadi salah satu faktor utama dalam menjalankan roda bisnis perak di Kotagede. Ketiga, etika yang diwariskan dalam bisnis perak diantaranya adalah: jujur, sabar, sederhana, bersih, rapi, teliti, niat kuat, inovatif, kerja keras.
Socio-Historical Media Tourism Promotion Study during the Dutch East Indies Period of 1930 - 1940
Authors: Banindro Baskoro Suryo , Swasono Arif Agung , Ardila Rikhana Widya 
Published: August 2020

This study discusses the media of tourism promotion in the Dutch East Indies period, in the form of lithographic print art images. The purpose of this research is to determine the meaning of visual language in the promotional media images. Promotional objects in question are pictures of lodging, photos of exotic cultural and natural products of the colonies insulinde printed between 1930 and 1940. With socio-historical methods consisting of social and historical studies, data obtained from literature studies, literature studies, and field observations will be analyzed using Teun A. van Dijk’s critical discourse approach. Furthermore, the results of the study will be interpreted descriptive qualitatively and presented with a historiographic approach. The findings of this study are there had been a process of Westernization in visual culture in the colonial period. The conclusion of this research is the portrayal of media promotion tourism during the Dutch East Indies of 1930-1940, which has given birth to traces of art deco style lithographic print as an effort of modernization in supporting modernity and developing a modernistic Dutch colonialist tourism aimed at European travelers. Penelitian ini membahas tentang media promosi wisata di masa kolonial Belanda, berupa gambar seni cetak litografi. Tujuan penelitian untuk mengetahui makna bahasa rupa yang ada dalam gambar media promosi tersebut. Objek promosi yang dimaksud adalah gambar penginapan, gambar hasil budaya dan alam eksotik pedalaman tanah jajahan insulinde yang dicetak antara tahun 1930 hingga 1940. Dengan metode sosio historis yang terdiri dari kajian sosial dan sejarah, data yang diperoleh dari studi literatur, kajian pustaka dan observasi lapangan akan dianalisis dengan pendekatan wacana kritis Teun A. van Dijk. Selanjutnya berdasarkan data yang ada, hasil penelitian akan diintepretasikan secara deskriptif kualitatif dan dipaparkan dengan pendekatan historiografi. Hasil temuan dari penelitian ini adalah bahwa telah terjadi proses pembaratan dalam budaya visual di masa kolonial. Adapun kesimpulan penelitian ini yaitu penggambaran media promosi wisata masa Hindia Belanda 1930 - 1940, telah melahirkan jejak seni cetak litografi bergaya art deco sebagai upaya modernisasi dalam mendukung modernitas dan memajukan pariwisata kolonialis Belanda yang modernistik di Hindia Belanda yang ditujukan bagi pelancong orang-orang Eropa.
History Curriculum Policy of Senior High School during Sukarno Era
Authors: Zulkarnain Zulkarnain 
Published: August 2020

This article aims to investigate the history curriculum policy of senior high school during the Sukarno era. The method used is qualitative research by using the historical approach. Also, this research used document study as the primary method. A document study was conducted to both the primary and secondary sources for the source triangulation. Additionally, the complementary approach used interviews with several practitioners and academics, including the practitioners of the Indonesia history curriculum. Data analysis used an interactive analysis model. The results show that during 1945-1951, the history curriculum of senior high school still used AMS (Algemene Middelbare School) curriculum as the inheritance from the Dutch Indies era, so it is directed to the political policy, and the materials are clearly oriented to politics, doctrine, national ideology. The philosophical foundation of history curriculum policy in senior high school during the Sukarno Era is based on Pancasila and UUD 1945. But its implementation refers to government politics and essentialism and perennialism philosophy. The position of history subject in senior high school during the Sukarno era has a strategic role in creating historical awareness and nationalism. However, Manipol USDEK indoctrination was very visible. Artikel ini bertujuan untuk menyelidiki kebijakan kurikulum sejarah SMA pada era Sukarno. Metode yang digunakan adalah penelitian kualitatif dengan menggunakan pendekatan sejarah. Selain itu, penelitian ini menggunakan studi dokumen sebagai metode utama. Studi dokumen dilakukan pada sumber primer dan sekunder untuk triangulasi sumber. Selain itu, pendekatan komplementer menggunakan wawancara dengan beberapa praktisi dan akademisi, termasuk praktisi kurikulum sejarah Indonesia. Analisis data menggunakan model analisis interaktif. Hasil penelitian menunjukkan bahwa selama tahun 1945-1951, kurikulum sejarah sekolah menengah atas masih menggunakan kurikulum AMS (Algemene Middelbare School) sebagai warisan dari jaman Hindia Belanda, sehingga mengarah pada kebijakan politik, dan materi yang jelas berorientasi pada politik, doktrin, ideologi nasional. Landasan filosofis kebijakan kurikulum sejarah di Sekolah Menengah Atas pada masa Sukarno berpijak pada Pancasila dan UUD 1945. Namun implementasinya mengacu pada filosofi politik pemerintahan dan esensialisme dan perenialisme. Kedudukan mata pelajaran sejarah di sekolah menengah atas pada era Soekarno memiliki peran strategis dalam menciptakan kesadaran sejarah dan nasionalisme. Namun, indoktrinasi Manipol USDEK sangat terlihat.
Vedic Aryan Society and Pattern of Production System
Authors: Adhikari Shukra Raj 
Published: August 2020

History is the sequential chain of the social structure of human beings. The Vedic Aryan society represents ancient human society. The main objective of this article is to find out the production system of livelihoods and the source of the means of production adopted by the Vedic Aryans. Based on historical facts of ancient civilization obtained through secondary sources, which have been analyzed through historical content analysis method. An attempt has been made in this article to find out the method of production of livelihoods and the source of production adopted by the Vedic Aryans. Men to be more involved in the expansion of resources and livestock and agricultural land, and as women were managing domestic work, the ownership of men over resources increased. Due to the process of state-building, regarding the ownership of resources, it appears that the resources were in the collective right of the family and couldn’t be sold or bought without the permission of the head of the family. We concluded that Mentioned facts are analog to the theory of production system of Karl Marx Sejarah adalah rantai sekuensial dari struktur sosial manusia. Masyarakat Arya Weda mewakili masyarakat manusia purba. Tujuan utama artikel ini adalah untuk mengetahui sistem produksi mata pencaharian dan sumber alat produksi yang diadopsi oleh Arya Weda. Berdasarkan fakta sejarah peradaban kuno diperoleh melalui sumber-sumber sekunder yang dianalisis melalui metode analisis isi sejarah. Sebuah upaya telah dilakukan dalam artikel ini untuk mengetahui metode produksi mata pencaharian dan sumber produksi yang diadopsi oleh para Arya Weda. Laki-laki untuk lebih terlibat dalam perluasan sumber daya dan ternak serta lahan pertanian, dan ketika perempuan mengelola pekerjaan rumah tangga, kepemilikan laki-laki atas sumber daya meningkat. Dalam proses pembangunan negara, mengenai kepemilikan sumber daya, tampak bahwa sumber daya tersebut merupakan hak kolektif keluarga dan tidak dapat dijual atau dibeli tanpa izin kepala keluarga. Kami menyimpulkan bahwa fakta yang disebutkan adalah analog dengan teori sistem produksi Karl Marx