bluuebunny/crossref_metadata_2025_split huggingface dataset:
KEMAMPUAN PEMAHAMAN KONSEP MATEMATIS MAHASISWA PGSD PADA MATERI GEOMETRI DASAR
Authors: Fitriasari Putri 
Published: May 2020

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Penelitian ini bertujuan untuk mendeskripsikan kemampuan pemahaman konsep matematis mahasiswa PGSD mengenai topik geometri dasar, serta mengidentifikasi kesulitan belajar mahasiswa pada topik geometri dasar. Penelitian ini menggunakan metode penelitian deskriptif. Subjek penelitian terdiri dari 40 orang mahasiswa tingkat pertama Program Studi Pendidikan Guru Sekolah Dasar Universitas PGRI Palembang. Data dalam penelitian ini dikumpulkan melalui tes tertulis tentang materi geometri dasar. Analisis data yang digunakan dalam penelitian ini adalah deskriptif kualitatif. Hasil analisis data diketahui bahwa rata-rata kemampuan pemahaman konsep matematis mahasiswa adalah 57,83 termasuk dalam kategori cukup. Dengan rincian 2 orang mahasiswa dengan kategori sangat baik, 14 orang mahasiswa dengan kategori baik, 15 orang mahasiswa dengan kategori cukup dan 9 orang mahasiswa dengan kategori kurang baik. Indikator kemampuan pemahaman matematis yang paling banyak muncul adalah kemampuan dalam mengklasifikasikan objek, sedangkan indikator yang paling sedikit adalah kemampuan dalam menjelaskan simetri lipat dan simetri putar pada bangun datar. Berdasarkan hasil penelitian dapat disimpulkan bahwa kemampuan pemahaman konsep matematis mahasiswa PGSD pada topik geometri dasar berada dalam kategori cukup.Â Â Kata kunci : geometri, kesulitan belajar, pemahaman konsep matematisÂ ABSTRACTThis study aims to describe studentsâ€™ understanding mathematical concepts of PGSD students regarding basic geometry topics, as well as identify student learning difficulties on basic geometry topics. This research uses descriptive research method. The research subjects consisted of 40 first-year students of the Primary School Teacher Education Study Program at the Palembang PGRI University. Data in this study were collected through written tests on basic geometry material. Analysis of the data used in this research is descriptive qualitative. The results of data analysis revealed that the average ability of understanding mathematical concepts of students was 57.83 included in the sufficient category. With the details of 2 students in very good categories, 14 students in good categories, 15 students in adequate categories and 9 students in poor categories. The most common indicator of mathematical understanding is the ability to classify objects, while the least indicator is the ability to explain folding symmetry and rotational symmetry on a flat figure. Based on the results of the study it can be concluded that the ability to understand mathematical concepts of PGSD students on basic geometry topics is in the sufficient category.Â Keywords : Â geometry, learning difficulties, understanding mathematicalÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â concepts
BUDAYA TABOT BENGKULU SEBAGAI PENDEKATAN PEMBELAJARAN BANGUN RUANG BERBASIS ETNOMATEMATIKA
Authors: Mahyudi Mahyudi , Yanti Rofika Sah 
Published: May 2020

Â Proses pembelajaran matematika di sekolah masih bersifat monoton dengan guru sebagai pusat pembelajaran dan metode belajar yang konvensional. Padahal matematika yang sifatnya abstrak, sangat menuntut guru untuk melakukan inovasi pembelajaran di kelas supaya siswa tidak merasa jenuh dan bosan. Hal inilah yang mengakibatkan siswa malas untuk mempelajari matematika. Untuk itu, guru harus membuat pembelajaran yang melibatkan siswa secara aktif dan bersifat kontekstual dengan kehidupan sehari-hari. Pembelajaran matematika realistik dengan pendekatan etnomatematika menjadi satu alternatif untuk mengatasi hal ini. Pendekatan pembelajaran dengan etnomatematika dapat menjembatani matematika dalam kehidupan sehari-hari yang berbasis budaya lokal. Penelitian ini merupakan deskriptif kualitatif dengan pendekatan etnografi untuk menggambarkan pemanfaatan budaya lokal tabot sebagai media pembelajaran bangun ruang berbasis etnomatematika. Informasi diperoleh melalui dokumentasi, observasi dan wawancara. Banyak hal yang dapat dimanfaatkan dari budaya lokal seperti budaya Tabot Bengkulu yang berhubungan dengan pembelajaran bangun ruang di sekolah. Bagian-bagian dari tabot terbentuk dari beberapa bangun ruang seperti, kubus, balok, limas terpancung. Bentuk-bentuk inilah yang kemudian dapat dimanfaatkan sebagai media pembelajaran matematika pada materi bangun ruang.Â Kata kunci : bangun ruang, etnomatematika, kontekstual, realistikÂ Â Â Â ABSTRACTThe process of learning mathematics in schools is still monotonous with the teacher as the center of learning and conventional learning methods. Even though mathematics which is abstract in nature, really requires teachers to innovate learning in the classroom so that students do not feel bored and bored. This has made students lazy to learn mathematics. For this reason, teachers must make learning that involves students actively and is contextual in their daily lives. Learning realistic mathematics with ethnomatematics approach becomes an alternative to overcome this. Learning approach with ethnomatematics can bridge mathematics in daily life based on local culture. This research is a qualitative descriptive ethnographic approach to illustrate the use of local culture as a medium of learning media based on ethnomatics. Information obtained through documentation, observation and interviews. Many things can be utilized from local culture such as Bengkulu Tabot culture that is related to learning to build space in schools. Parts of the tabot are formed from several building blocks such as cubes, beams, pyramid and beheaded. These forms can then be used as a medium for learning mathematics in the material of building space.Â Keywords : building space, ethnomatematics, contextual, realistic
The importance of social memory in biblical texts
Authors: Ostrovskyy Roman 
Published: May 2020

The article deals with the phenomenon of "social memory" in the light of current research studies. The next step is to see the recovery of the people's memory through the lens of biblical texts. The book of the prophet Jonah and the passage from the book of the prophet Amos 2:1-3 are the main texts the study is based on. The author emphasizes the main aspects of the text of the prophet Amos: condemnation of those who destroy the memory of another people; indicating the consequences that the aggressor should expect for his action.
Evaluation of low energy X-ray depth dose distribution by gafchromic film for dosimetry in food irradiation
Authors: Van Ngoc Hoang , Le Huy Viet , Nguyen Son An , Tamikazu Kume 
Published: May 2020

Introduction: Dosimetry is of crucial importance in radiation processing of food. Among others, plastic film has been widely used for dosimetry in radiation therapy since its density is quite similar to the equivalent biological materials. In this study, the depth dose distribution was estimated by using gafchromic film for the purpose of dosimetry in food irradiation.
Experimental: The HD-V2 gafchromic dosimetry film was employed to measure the interested dose instead of ion chamber. A stack of 19 PMMA (polymethyl methacrylate) sheets interleaved with 20 pieces of gafchromic film was made. The phantom was applied in the low energy X-ray beams (maximum 100 keV) to obtain the depth dose profile.
Results: A significant correlation between absorbed doses (D) and color level or optical density (O.D.) of irradiated dosimetry films was observed. The fitting function has the form of , where a, b, c are the parameters to be fitted. The depth dose distribution in the 30 mm thickness phantom was inferred from the calibration.
Conclusion: The present method and the depth dose profile to be obtained are very meaningful in the processing of foodstuffs by radiation.
Isolation of cellulose nanocrystals from rice husk using the formic/ peroxyformic acid process
Authors: Vu An Nang , Nguyen Nhi Van , Tran Van Thi Thanh , Ha Thuc Nhan Chi , Le Hieu Van 
Published: May 2020

Cellulose nanocrystals (CNCs) is one of the interesting materials attracting many researchers from the decades, especially when they are extracted from natural biomass resources. The aim of this study was to explore the utilization of rice husk residues as source for the production of CNCs. Cellulose was extracted from rice husk based on chemical method, using the formic/ peroxyformic acid process in order to effectively remove lignin and hemicelluloses from raw material. The cellulose was then treated by acid hydrolysis process performing at 45oC for 30 min, using 15 mL of H2SO4 (64% wt) for each gram of cellulose. The material obtained after each stage of the treatments was carefully characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Transmission electron microscopy (TEM). Morphological characterization from TEM revealed the appearance of needle-like shaped CNCs, average diameter and length of 15 nm and 480 nm, respectively. FT-IR results indicated that lignin was completely removed from the samples during chemical treatment. The thermal stability of the materials in successive treatments was also investigated using thermogravimetric analysis (TGA). These promising results proved revalue of this by-product for the production of CNCs and its potential use as reinforcement in the preparation of nanocomposites.
Preliminary Empirical study of the Rayleigh to Compton scattering ratio for elements at gamma energy 59.5 keV using Si(Li) detector
Authors: Thien Thanh Tran , Phat Van Tan , Minh Le Hoang , Chuong Huynh Dinh , Nguyen Vo Hoang , Phuc Nguyen Tri Toan , Vuong Le Quang , Thong Nguyen Duy , Tao Chau Van 
Published: May 2020

The characteristic parameters of a material relation to photon interactions such as: mass attenuation coefficient, effective atomic number, effective electron density are required to provide essential data in diverse works such as nuclear diagnostic and cancer radiotherapy, industrial irradiation, radiation dosimetry, radiation protection and shielding, analyzing of the concentration of elements and radioactive isotopes. In this paper, the theoretical models such as non-relativistic form factor (NRFF), relativistic form factor (RFF), and modified form factor (MFF) were used to calculate the ratio Rayleigh-Compton for elements with at gamma energy 59.5 keV. The results showed that there was a discrepancy between the theoretical modes at a high atomic number. The mean value of the Rayleigh-Compton ratio depends on the atomic number, which shows the quadratic function of the correlation coefficient R2 = 0.996 as well. Besides, the experimental system was set-up and measured for some targets such as aluminum, copper, and lead at a scattering angle 150o using 241Am source by Si(Li) detector to confirm the theoretical values. The preliminary result showed that there was a good agreement with experimental and theoretical results is lower than 20%. Further investigation will be measured by the samples for more detailed evaluation.
Pengaruh Penambahan Tepung Labu Kuning terhadap Kandungan Karbohidrat dan Protein Cookies
Authors: Hatta Herman , Sandalayuk Marselia 
Published: May 2020

Yellow pumpkin is a commodity that is easily damaged so it needs for off harvest handling including preservation and processing. This study was aimed to determine the carbohydrate, protein content of pumpkin flour and get the best formulation in making cookies from pumpkin flour. The research method used was true experimental design using with completely randomized design (CRD) with variations in the addition of pumpkin flour in the treatment of P0 (60 gr), P1 (100 gr), P2 (150 gr), P3 (150 gr), P4 (250 gr) with two replications. Based on the results of the cookie test, the highest carbohydrate content in P0 treatment was 59.12% in treatment 1 and 57.61% in treatment 2 while the lowest in P4 treatment was 51.36% in replication 1 and 51.83% in replications 2, analysis of variance showed that carbohydrates in cookies significantly affected with addition of pumpkin flour, based on further analysis Duncan's test results (p < 0.00). Protein analysis test results showed that the highest protein content in treatment P4 was 8.44% replications 1 and 7.46% in replications 2, while the lowest in treatment P0 was 7.17% replications 1 and 7.44% in replications 2, analysis the variance showed that the protein in cookies had a very significant effect on the addition of pumpkin flour, based on further analysis Duncan's test results (p < 0.00). It was concluded that the addition of pumpkin flour significantly affected in carbohydrate and protein levels in cookies.Labu kuning adalah komoditas yang mudah rusak sehingga perlu adanya penanganan lepas panen termasuk pengawetan dan pengolahan.Penelitian ini bertujuan untuk mengetahui kandungan karbohidrat, protein dari tepung labu kuning serta mendapatkan formulasi terbaik dalam pembuatan cookies dari tepung labu kuning. Metode penelitian yang digunakan adalah true experimental design menggunakan rancangan acak lengkap (RAL) dengan variasi penambahan tepung labu kuning pada perlakuan P0 (60 gr), P1 (100 gr), P2 (150 gr), P3 (200 gr), P4 (250 gr) dengan perlakuan dua kali ulangan. Berdasarkan hasil uji kue cookies menunjukkan kandungan karobohidat tertinggi pada perlakuan P0 sebesar 59,12% pada pengulangan 1 dan 57,61% pada pengulangan 2 sedangkan terendah pada perlakuan P4 sebesar 51,36% pada pengulangan 1 dan 51,83% pada pengulangan 2, analisa sidik ragam menunjukkan bahwa karbohidrat pada cookies berpengaruh nyata terhadap penambahan tepung labu kuning, berdasarkan hasil uji lanjut Duncan (p < 0,00). Hasil uji analisa protein menunjukkan bahwa kandungan protein tertinggi pada perlakuan P4 sebesar 8,44% pengulangan 1 dan 7,46% pada pengulangan 2, sedangkan terendah pada perlakuan P0 sebesar 7,17% pengulangan 1 dan 7,44% pada pengulangan 2, analisa sidik ragam menunjukkan bahwa protein pada kue cookies berpengaruh sangat nyata terhadap penambahan tepung labu kuning, berdasarkan hasil uji lanjut Duncan (p < 0,00). Disimpulkan bahwa penambahan tepung labu kuning berpengaruh nyata terhadap kadar karbohidrat dan protein pada cookies.
Variabilitas Iklim dengan Kejadian Demam Berdarah Dengue di Kota Tangerang
Authors: Juwita Citra Puspa 
Published: May 2020

Dengue Hemorrhagic Fever (DHF) is an endemic disease of Tangerang City with fluctuating case month by month. DHF is a disease that caused by dengue virus and transmitted by Ae. Aegypti, and also have relation with climate variability conditions. This research is using secondary data with ecological study design by using time series, to see the correlations between climate variability (temperature, precipitation and humidity) with hemorarhagic dengue fever cases in Tangerang City in the period 2004-2013. This research was using univariate analysis method and bivariate analysis with correlation and linear regression. This study revealed that significant correlation between dengue hemorrhagic fever cases with climate variability; in moderate correlation which correlation between dengue hemorrhagic fever with temperature has coefficient correlation 0,314 and p = 0.004; correlation between dengue hemorrhagic fever with precipitation has coefficient correlation 0,355 and p = 0.000; and correlation between dengue hemorrhagic fever with humidity has coefficient correlation 0,298 and p = 0.002. Strong correlations can be seen with a short period by year. Significant relationship on climate variability (temperature, rainfall and humidity) with the incidence of DHF period of 10 years (2004-2013) with moderate closeness.Demam Berdarah Dengue (DBD) merupakan penyakit yang endemis di Kota Tangerang dengan kejadian yang berfluktuasi per bulannya. Penyakit yang disebabkan oleh virus dengue yang ditularkan oleh nyamuk Ae. aegypti ini akan tinggi ketika musim penghujan tiba dan akan berangsur-angsur menurun ketika tidak musim penghujan. Dengan menggunakan data sekunder yang tersedia, penelitian ini menggunakan desain studi ekologi, berdasarkan urutan waktu (time series) untuk melihat adakah hubungan antara variabilitas iklim (suhu, curah hujan dan kelembaban) dengan kejadian demam berdarah dengue di Kota Tangerang. Analisis yang digunakan adalah univariat dengan menggunakan distribusi frekuensi dan analisis bivariat dengan uji korelasi dan regresi linear. Berdasarkan hasil penelitian dinyatakan bahwa adanya hubungan yang bermakna antara kejadian demam berdarah dengue dengan variabilitas iklim dengan keeratan hubungan yang sedang yaitu pada hubungan antara kejadian demam berdarah dengue dengan suhu memiliki koefesien korelasi 0,314 dan nilai p = 0,004; hubungan antara kejadian demam berdarah dengue dengan curah hujan memiliki koefesien korelasi 0,355 dan nilai p = 0,000; dan hubungan antara kejadian demam berdarah dengue dengan kelembaban memiliki koefesien korelasi 0,298 dan p = 0,002. Hubungan yang erat dapat dilihat dengan periode waktu yang pendek yaitu per tahun. Hubungan yang bermakna pada variabilitas iklim (suhu, curah hujan dan kelembaban) dengan kejadian DBD periode 10 tahun (2004-2013) dengan keeratan sedang.
Hubungan Kebiasaan Cuci Tangan, Mengelola Air Minum dan Makanan dengan Stunting di Sulawesi Tengah
Authors: Syam Dedi Mahyudin , Sunuh Herlina S 
Published: May 2020

Environmental factors, birth weight and food intake can influence the incidence of stunting. The prevalence of stunting in toddlers in Central Sulawesi Province in 2015 was very short by 11.4% and short by 23.9%. 2-16 very short categories by 10.2% and short categories by 21.8%. 2017 the very short category was 14.0% and the short category was 22.1%. The purpose of this research was to know handwashing with soap, treating drinking water and food related to stunting in Central Sulawesi. The type of research was analytic with the approach of cross sectional survey with a sample 289 people in 4 (four) Regency Areas (Banggai, Donggala, Sigi and Palu). Data processing and analysis include univariate and bivariate were used chi square test. Results of 289 respondents carry out handwasing with soap 176 (60.9%), not carry out handwasing with soap activity 113 (39.1%), statistical test obtained p value = 0.000. Treating drinking water and food 270 (93.4%), not treating clean water and food only 19 (6.6%), stunting status 133 (46.0%), not stunting 155 (56.0%), statistical test obtained p value = 0.001. Conclusion There was a relationship between hand washing with soap, treating drinking water and food with stunting in Central Sulawesi.Faktor lingkungan, berat badan lahir dan asupan makanan dapat mempengaruhi kejadian stunting. Prevalensi stunting pada balita di Provinsi Sulawesi Tengah tahun 2015 kategori sangat pendek sebesar 11.4% dan pendek sebesar 23.9%. 2-16 kategori sangat pendek sebesar 10.2% dan kategori pendek sebesar 21,8%. 2017 kategori sangat pendek sebesar 14.0% dan kategori pendek sebesar 22.1%. Tujuan penelitian adalah diketahuinya cuci tangan pakai sabun (CTPS), mengelola air minum dan makanan berhubungan dengan stunting di Sulawesi Tengah. Jenis penelitian adalah analitik dengan pendekatan cross sectional survey dengan sampel berjumlah 289 orang di 4 (empat) daerah Kabupaten (Banggai, Donggala, Sigi dan Palu). Pengolahan dan analisis data meliputi univariat, Bivariat menggunakan uji chi square. Hasil penelitian menunjukkan dari 289 responden melaksanakan CTPS 176 (60,.9%), tidak CTPS 113 (39,1%), Uji statistik diperoleh nilai p = 0,000. Sudah mengelola air minum dan makanan 270 (93,4%), tidak mengelola air bersih dan makanan 19 (6,6%), status gizi stunting 133 (46,0%), tidak stunting 155 (56,0%), uji statistik diperoleh nilai p = 0,001. Kesimpulan ada hubungan cuci tangan pakai sabun, pengelolaan air minum dan makanan dengan stunting di Sulawesi Tengah.
Opini Remaja tentang Peringatan Kesehatan Bergambar dan Peraturan Daerah Kawasan Tanpa Rokok
Authors: Devhy Ni Luh Putu , Widana Anak Agung Gde Oka 
Published: May 2020

Pictorial health warnings (PHW)) and local regulations non-smoking areas (NSA) are among the government's efforts to reduce the prevalence of smoking. This study aims to describe adolescent opinions about PHW and Perda involving 158 samples. The sample was chosen by random sampling, the sample was teenagers who sat in junior high school. Data collection was done through structured interviews using questionnaires that have been tested before then analyzed descriptively. The average results of respondents were 13 years old, 57.6% were women and 42.4% were men. 93% of respondents already knew of PHW and 89.2% saw PKB within 30 days. 94.9% of respondents said that PWH made them concerned about the dangers of smoking, 94.3% of respondents believed that PWH was more effective than written health warnings, and 97.5% of respondents supported implementing PWH. 90.5% of respondents knew about the NSA regulation, 98.1% of respondents knew that schools were the NSA regional regulation area, 97.5% respondents supported the implementation of the NSA regulation in all public areas, 97.5% of respondents supported the government in enforcing the local regulation NSA in the room. In this study the five most frightening PWH images according to adolescents in the first position are lung cancer PWH. The results showed positive opinions and obtained support from adolescents to the regional regulation on smoke free area and PHW, so this can be used to develop a cigarette hazard control program.Peringatan kesehatan bergambar (PKB) dan peraturan daerah (PERDA) Kawasan tanpa rokok (KTR) merupakan salah satu upaya pemerintah yang dilakukan untuk menurunkan prevalensi merokok. Penelitian ini bertujuan untuk menggambarkan opini remaja tentang PKB dan Perda yang melibatkan 158 sampel. Sampel dipilih secara random sampling, sampel merupakan remaja yang duduk dibangku SMP. Pengumpulan data dilakukan melalui wawancara terstruktur dengan menggunakan kuisioner yang telah diuji sebelumnya kemudian dianalisis secara deskriptif. Hasil penelitian menunjukkan rerata responden berusia 13 tahun, 57,6% adalah perempuan dan 42,4% adalah laki-laki. 93% responden sudah tahu adanya PKB dan 89,2% melihat PKB dalam 30 hari. 94,9% responden mengatakan bahwa PKB membuat mereka peduli terhadap bahaya merokok, 94,3% responden percaya bahwa PKB lebih efektif daripada peringatan kesehatan berupa tulisan, dan 97,5% responden mendukung PKB implementasi PKB. 90,5% responden sudah tahu adanya Perda KTR, 98,1% responden sudah tahu di sekolah merupakan kawasan Perda KTR, 97,5% reponden mendukung implementasi Perda KTR di semua area tempat umum, 97,5% responden mendukung pemerintah dalam menegakkan Perda KTR di dalam ruangan. Pada penelitian ini kelima gambar PKB yang paling menakutkan menurut remaja pada posisi pertama adalah PKB kanker paru. Hasil menunjukkan opini yang positif dan didapatkan dukungan remaja terhadap Perda KTR dan PKB, maka hal ini dapat digunakan untuk pengembangan program pengendalian bahaya rokok.