bluuebunny/crossref_metadata_2025_split huggingface dataset:
Suseptibilitas Magnetik Tanah Sebagai Indikator Bencana Longsor Daerah Sitinjau Lauik
Authors: Dhani Alvan , Afdal Afdal , Budiman Arif 
Published: March 2022

Pengukuran nilai suseptibilitas magnetik tanah untuk memprediksi longsor pada daerah Sitinjau Lauik telah dilakukan menggunakan metoda kemagneta batuan .Â Sampel tanah diambil berdasarkan daerah yang diduga belum terjadi longsor (L2 dan L3) dan daerah telah terjadi longsor (L1 dan L4) sebanyak empat daerah, sampel diambil dengan variasi kemiringan (atas, tengah, bawah) dan kedalaman 25, 50, dan 75 cm sebanyak 36 titik sampel.Â Pengukuran suseptibilitas magnetik mengunakan alat Bartington Susceptibility Meter MS2B.Â Pada daerah diduga belum terjadi longsor nilai Ï‡LF Â rata-rata yaitu 405,9Ã—10-8 m3kg-1, sedangkan pada daerah telah terjadi longsor nilai Ï‡LFÂ rata-rata yaitu 285,2 Ã—10-8 m3kg-1.Â Hasil pengukuran nilai suseptibilitas magnetik menunjukkan bahwa tanah yang terkandung di daerah sitinjau lauik mengandung lempung, dengan ditemukannya mineral magnetik seperti illite, montmorillonite, dan hematit yang merupakan mineral penyusun dari lempung. Â Daerah L3 lebih rentan terjadi longsor karena memiliki nilai Ï‡FD (%) berkisar (1,79-7,65)% dengan rata-rata 4,08 %, yang menunjukkan tanah pada L3 telah dipengaruhi oleh perubahan suhu dan cuaca yang akan menyebabkan sifat magnetik dari tanah tersebut melemah dan terjadilah pelapukan pada tanah sehingga memicu pergerakan tanah.Â Measurement of soil magnetic susceptibility to predict landslides in Sitinjau Lauik has been happened by using the rock magnetism method.Â Sample were taken from four areas based on area that has not happened landslide (L2 and L3) and area where landslide had occurred (L1 and L4). Sample were taken with slope variation ( top, middle, and bottom) and depth of 25, 50, 75 cm for 36 samples.Â The magnetic susceptibility measurement was performed with Bartington Susceptibility Meter MS2B.Â The results of measuring the magnetic susceptibility value show that the soil contained in the lauik site contains clay, with the discovery of magnetic minerals such as illite, montmorillonite, and hematite which are the constituent minerals of clay. The L3 area is more prone to landslides because it has a value of Ï‡FD (%) ranging (1.79-7.65)% with an average of 4.08%, which indicates that the soil at L3 has been affected by changes in temperature and weather which will cause magnetic properties from the soil weakens and there is weathering of the soil, which triggers soil movement.
Identifikasi Pencemaran Logam Berat pada Sedimen Sungai Batang Arau Kota Padang Berdasarkan Nilai Suseptibilitas Magnetik
Authors: Yanti Ridha Putri , Afdal Afdal 
Published: March 2022

Telah dilakukan identifikasi pencemaran logam berat pada sedimen Sungai Batang Arau Kota Padang berdasarkan nilai suseptibilitas magnetik. Pengambilan sampel dilakukan mulai dari hulu hingga hilir pada 20 titik dengan kedalaman 10 cm. Hasil pengukuran menunjukkan nilai suseptibilitas magnetikÂ berkisar antara 116,6Ã—10-8 kg-1m3 sampai 914,0Ã—10-8 kg-1m3. Pola Ï‡FD (%) pada scattergram menunjukkan bahwa hampir seluruh sampel memiliki nilai Ï‡FD (%) < 5%. Hal ini menunjukkan ukuran bulir di lokasi penelitian yaitu bulir non-SP campuran halus dan kasar yang banyak dihasilkan dari proses-proses pencemaran. Berdasarkan nilai suseptibilitas magnetik Â dan pola Ï‡FD (%) pada scattergram daerah penelitian telah mengalami pencemaran dari kategori tercemar rendah hingga tercemar sangat tinggi. Sedimen yang terletak di zona perumahan padat penduduk di kawasan tengah sungai cenderung memiliki nilai suseptibilitas yang lebih tinggi daripada di zona perumahan non-padat penduduk di kawasan hulu. Dapat dikatakan sumber dari pencemaran ini adalah sumber antropogenik.Â Â Identification of heavy metal pollution in the sediments of the Batang Arau River, Padang City based on the magnetic susceptibility value has been carried out. Sampling was collected from upstream to downstream at 20 points with 10 cm depth. The results shows that magnetic susceptibility values range from 116.6Ã— 10-8 kg-1m3 to 914.0 Ã— 10-8 kg-1m3. The pattern of Ï‡FD (%) in the scattergram shows that almost all samples have a value of Ï‡FD (%) <5%. This shows the grain size in the research location, namely the fine and coarse mixture of non-SP grains which are mostly produced from pollution processes. Based on the magnetic susceptibility value and the Ï‡FD(%) patternÂ in the scattergram, the research area has experienced pollution from low to very high polluted categories. Sediments located in densely populated residential zones in the midstream area Â to have a higher susceptibility value than in non-densely populated residential zones in the upstream area. It can be said that the source of this pollution is an anthropogenic source.
Identifikasi Air Tanah di Daerah Pesisir Pantai Kolbano
Authors: Boimau Yanti , Lestari Anastasia Kadek Dety 
Published: March 2022

Telah dilakukan penelitian identifikasi air tanah di wilayah pesisir Kolbano yang bertujuan untuk mengetahui dan menentukan kedalaman air tanah di lokasi penelitian. Metode yang digunakan adalah metode geolistrik dengan konfigurasi Schlumberger. Data yang diperoleh di lokasi penelitian diolah menggunakan software Res2dinv untuk mendapatkan nilai resistivitas batuan di lapangan. Hasil inversi menunjukkan nilai resistivitas batuan terukur pada 3 lintasan yaitu 17,1-27,626 Î©m. Berdasarkan nilai resistivitas yang diperoleh, diasumsikan terdapat 3 jenis lapisan batuan di lapangan, yaitu lempung dengan resistivitas (10-100) Î©m dan aluvium dengan resistivitas (101â€“800 Î©m) dan batugamping (101â€“27.626 Î©m). Potensi batuan sebagai batuan akuifer adalah alluvium. Air tanah yang tersimpan di batuan aluvium terletak pada kedalaman (12-20 m)Â Research on groundwater identification in the coastal area of Kolbano has been carried out, which aims to determine and determine the depth of groundwater at the research location. The method used is the geoelectric method with a schlumberger configuration. The data obtained at the research location were processed using res2dinv software to obtain the rock resistivity value in the field. The inversion results show the measured rock resistivity value on 3 measurement line, namely 17.1-27.626 Î©m Based on the resistivity value obtained, it is assumed that there are 3 types of rock layers in the field, consisting of clay with resistivity (10-100 Î©m) and alluvium with resistivity (101-800 Î©m) and limestone (101-27.626Î©m). Rocks Potential as aquifer rocks is alluvium. Groundwater stored in alluvium rocks lies at a depth (12-20 meters).
Prediksi El Nino Southern Oscillation (ENSO) Menggunakan Jaringan Saraf Tiruan (JST)-Backpropagation
Authors: Aprilia Bunga , Marzuki Marzuki , Taufiq Imam 
Published: March 2022

Penelitian ini bertujuan untuk memprediksi nilai indeks ENSO yaituÂ Sea Surface TemperatureÂ (Nino 1.2, Nino 3, Nino 3.4 dan Nino 4),Â Southern Oscillation IndexÂ (SOI) danÂ Multivariate ENSO Index versi 2Â (MEI.v2) yang diambil dari tahun 1979-2018. Prediksi dilakukan dengan menggunakan metode JST-backpropagationÂ dengan memvariasikanÂ learning rateÂ dan momentum. Semua indeks menghasilkan nilai akurasi prediksi ENSO yang tinggi,Â namun indeks Nino 4 merupakan indeks yang memiliki akurasi tertinggi karena nilaiÂ Mean Square ErrorÂ (MSE) pelatihan dan pengujiannya yang relatif lebih kecil dibandingkan dengan indeks lainnya. Indeks Nino 4 memiliki MSE pelatihan 0,0072739 yang berhenti padaÂ epochÂ ke-69 dan MSE pengujian 0,0085917 dengan akurasi prediksi 99,9989%. Hasil ini diperoleh dari arsitektur JST-backpropagationÂ 12-10-1 dengan nilaiÂ learning rateÂ 0,10 dan momentum 0,40.Â Prediksi ENSO berdasarkan indeks Nino 4 untuk tahun 2021 menunjukkan keadaan iklim dunia dalam kondisi normal.Â This study aims to predict ENSO index using Sea Surface Temperature (Nino 1.2, Nino 3, Nino 3.4 and Nino 4 indexes), Southern Oscillation Index (SOI), and Multivariate ENSO Index version 2 (MEI.v2) during Â 1979 - 2018. The prediction was carried out using the ANN-backpropagation method by varying the learning rate and momentum. All indices produce high ENSO prediction accuracy values, but the Nino 4 index is the best one because the Mean Square Error (MSE) for training and testing steps are relatively smaller than other indexes. The Nino 4 index has a training MSE of 0.0072739 which stops at the 69th epoch and a testing MSE of 0.0085917 with a predictive accuracy of 99.9989%. These results were obtained from the back-propagation architecture ANN 12-10-1 with a learning rate of 0.10 and a momentum of 0.40. The prediction of ENSO in 2021 based on the Nino 4 index shows that the world climate condition is under normal conditions.
Identifikasi Karakteristik Mata Air Panas Bumi di Sibanggor Tonga Kabupaten Mandailing Natal Menggunakan Diagram Segitiga Fluida
Authors: Jasmita Murda , Putra Ardian 
Published: March 2022

Telah dilakukan penelitian tentang identifikasi karakteristik fluida mata air panas tipe fluida, kesetimbangan, asal usul sumber fluida dan pengenceran mata air panas bumi di Sibanggor Tonga Kabupaten Mandailing Natal. Sampel penelitian diambil dari lima sumber mata air dengan volume sampel di setiap lokasi sebanyak 500 ml. Nilai pH dari 5 titik mata air panas berkisarÂ dari 0,6 sampai 6,3 dan pengukuran temperatur permukaan diperoleh mulai dari 37,6 oC hingga 95,3 oC. Konsentrasi unsur Na, K, Mg, K, B dan Li diukur menggunakan Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES). Pengukuran konsentrasi unsur Cl diperoleh dari persamaan konduktivitas yang didapatkan dari alat conductivity meter dan pengukuran konsentrasi SO4 dengan metode visible spectroscopy. Pengukuran konsentrasi HCO3 diukur dengan metode titrasi asam basa. Diagram Cl-HCO3-SO4 menunjukkan semua fluida bertipe sulfat-klorida dan diagram Na-K-Mg menunjukkan semua fluida berada pada immature water yang mengindikasikan fluida telah mengalami reaksi dengan unsur lain saat menuju permukaan. Asal sumber fluida berada jauh dari reservoir atau aliran fluida bergerak secara lateral saat menuju permukaan, yang terlihat dari diagram Cl-B-Li.Â Â Research has been carried out on the identification of the characteristics of the hot spring fluid type, equilibrium, the origin of the fluid source and the dilution of the geothermal springs in Sibanggor Tonga, Mandailing Natal Regency. The research sample was taken from five springs with a sample volume of 500 ml at each location. The pH values of the 5 hot springs ranged from 0.6 to 6.3 and surface temperature measurements were obtained from 37.6Â°C to 95.3Â°C. The concentrations of Na, K, Mg, K, B and Li were measured using Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES). Measurement of the element concentration of Cl is obtained from the conductivity equation obtained from a conductivity meter and measurement of SO4 concentrations using the visible spectroscopy method. HCO3 concentration measurements were measured by the acid-base titration method. The Cl-HCO3-SO4 diagram shows all sulfate-chloride type fluids and the Na-K-Mg diagram shows all fluids are in immature water which indicates that the fluid has undergone a reaction with other elements when it reaches the surface. As long as the fluid source is far from the reservoir or the fluid flow moves laterally towards the surface, as seen from the Cl-B-Li diagram.
Tomografi Kecepatan Seismik 3D Daerah Danau Toba Menggunakan SimulPS12
Authors: Anggraini Novia , Pujiastuti Dwi , Aulia Atin Nur 
Published: March 2022

Gunung Toba adalah salah satu gunung purba di Indonesia yang berada di Sumatera Utara. Terdapat dua aktivitas yang mempengaruhi gunung tersebut, yaitu aktivitas vulkanik yang berasal dari magma di bawahnya dan aktivitas tektonik yang berasal dari subduksi Lempang Indo-australia. Meskipun sudah lebih dari 70.000 tahun sejak terakhir kali erupsi dan menyebabkan terbentuknya kaldera vulkano-tektonik tersebar di dunia, yaitu Kaldera Toba, aktivitas-aktivitas tersebut masih ada. Salah satu hal yang dapat dilakukan untuk mengetahui keadaan di bawahnya adalah dengan melakukan tomografi kecepatan seismik 3D. Pada penelitian ini, program yang digunakan adalah SimulPS12 dan menghasilkan tomogram anomali Vp, Vs dan rasio Vp/Vs.Â Berdasarkan hasil tomografi tersebut diketahui bahwa zona lemah terdapat pada kedalaman 30 km di bagian tengah Danau Toba dan kedalaman 50 km. Adapun proses partial melting terjadi pada kedalaman sekitar 130 km hingga 50 km yang berasal dari slab subduksi di bawah Danau Toba.Â Pada kedalaman 30 km, selain anomali negatif, juga terlihat pola anomali Vp dan Vs positif yang mengindikasikan keberadaan bekas konduit dari intrusi magma yang membeku. Selain itu, aktivitas seismik juga terlihat tersebar pada beberapa titik di sekitar Kaldera Toba seperti di Gunung Pusuk Buhit dan Gunung Pardepur.Â Toba volcano is one of the ancient volcanoes in Indonesia located in Northern Sumatera.Â There were two activities having an affect on the volcano, the volcanic activity from the magma chamber beneath the Toba caldera complex and the tectonic activity from the subduction of Indo-Australia Plate. Despite the last eruption of Toba was about 70.000 years ago, the activities were still exist.Â The 3D seismic tomography could be carried out to understand the conditions beneath Toba Caldera.Â In this research, the data was processed using the SimulPS12 program, and tomography images obtained were from Vp, Vs, and Vp/Vs ratio. Â The results showed that the weak zones were found in the depth of 30 km in the middle part of Toba Caldera and the depth of 50 km. The partial melting process was in the depth of about 130 km to 50 km beneath Toba Caldera. The depth of 30 km was also found the high anomaly of Vp and Vs which indicated the existence of the remnant conduit of solidified magma.Â In addition, the other seismic activities could also be found in its vicinity, i. e., in Pusuk Buhit Volcano and Pardepur Volcano.
Pembuatan Karbon Aktif dari Tandan Kosong Kelapa Sawit sebagai Elektroda Superkapasitor
Authors: Hardi Amelina Dwika , Joni Rahma , Syukri Syukri , Aziz Hermansyah 
Published: March 2022

Pembuatan karbon aktif dari Tandan Kosong Kelapa Sawit (TKS) sebagai elektroda superkapasitor sudah diteliti. Karbon aktif dibuat dari proses karbonisasi dan aktivasi menggunakan Kalium Hidroksida (KOH). Karbon aktif TKS dikarbonisasi melalui pembakaran sampel pada suhu 400Â°C dan diaktivasi dengan KOH pada suhu 800Â°C dalam lingkungan gas nitrogen. Karbon aktif TKS dikarakterisasi menggunakan Energi Dispersive X-Ray (EDX),Â X-Ray Difraction (XRD), Scanning Electron Miscroscopy (SEM), Surface Area Analyzer (SAA).Â Komposisi unsur karbon yang dihasilkan dari karbon aktif TKS adalah sebesar 88,93 %wt.Â Struktur kristalit dariÂ karbon aktif TKS menunjukkan struktur amorf pada sudut 2Î¸ 26,20Â° dan 43,08Â°. Hasil analisis SAA dengan metode Brunauer-Emmet-Teller (BET) didapatkan luas permukaan karbon aktif TKS sebesar 898,229 m2/g. Pengukuran sifat listrik karbon Aktif TKS sebagai elektroda superkapasitor menggunakan larutan elktrolit H2SO4 1M dengan metoda Cyclic Voltametry (CV) didapatkan nilai kapasitansi spesifik sebesar 107,83 F/g.Â Preparation of activated carbon from Oil Palm Empty Fruit Bunch (TKS) as a supercapacitor electrode has been investigated. Activated carbon is made from carbonization and activation processes using Potassium Hydroxide (KOH). Activated carbon TKS is carbonized by burning the sample at 400Â°C and activated with KOH at 800Â°C in a nitrogen gas environment. Activated carbon TKS was characterized using Energi Dispersive X-Ray (EDX), X-Ray Difraction (XRD), Scanning Electron Miscroscopy (SEM), Surface Area Analyzer (SAA). The composition of the element carbon produced from activated carbon TKS is 88.93% wt. The crystallite structure of TKS activated carbon shows an amorphous structure at an angle of 2Î¸ 26,20Â° and 43,08Â°. The results of the SAA analysis by the Brunauer-Emmet-Teller (BET) method showed that the surface area of the TKS activated carbon was 898.229 m2/g. Measurement of electrical properties of activated carbon TKS as a supercapacitor electrode using a 1M H2SO4 electrolyte solution with the Cyclic Voltametry (CV) method obtained specific capacitance values of 107.83 F /g.
THE INVOLVEMENT OF ENGLISH LECTURERS AS PARENTS IN TEACHING ENGLISH FOR THEIR CHILDREN AS YOUNG LEARNERS IN THIS 21ST CENTURY
Authors: Nasir Sri Awaliyah , Amaluddin Amaluddin , Larekeng Siti Hajar 
Published: March 2022

Learning English is very important in this 21st Century where English has a big influence in all aspect of life. The right time to teach English is at the primary age because children have amazing abilities in studying a language. In the process of teaching English not only teacher’s support is needed but also parents’ involvement in this case parents as English Lecturer, it is not enough just in the school but also in the family environment. This research comes to investigate the involvement of Parents in the process of learning English for their children as young learners in this 21st century. The Researcher is quantitative research method, in order there are two instruments are provided as the procedure in collecting the data needed, these are questionnaire and interview. The sample consisted of 24 parents as the English lecturers and have children categorized as young learners in Universitas Muhammadiyah Parepare and Universitas Muhammadiyah Makassar, in Indonesia. The result of this research shown that parents’ as English lecturers have a very positive perspective in teaching English to their children as young learners more over English will support their children carrier in the future, but their involvement are not very intense. Even though, they are excited to be involve in teaching English to their children as a foreign language for them without forgetting their local language, however they agreed that they can face some challenges in this process.
POINT-COUNTER-POINT STRATEGY TO ELEVATE STUDENTS’ WRITING PERFORMANCE BY USING VIDEO-BLOG
Authors: Faharuddin Fahirah , Nur Rafi’ah , Ammade Salasiah 
Published: March 2022

This research was finding out the learners’ writing performance through point-counterpoint strategy by using video blog. The aims of this research were: 1) to find out whether or not the point-counterpoint strategy through video blog elevate the learners’ writing performance, and 2) to find out the learners’ interest toward the use of video blog through point-counter-point strategy in teaching writing performance. Pre experimental design is carried out by the researcher in this research. The sample of this research was XI IPA2 (33 learners). This sample was taken by the random sampling technique. This research applied two kinds of instruments were writing test and questionnaire in this research.The result of this research shows that the learners’ performance is better writing after they taught by using point-counter-point strategy through video blog at SMA Negeri 3 Polewali Mandar. It was proved by the mean score of the post-test was higher than the pre-test (81.9668.03). So, the researcher stated that H0 was rejected and H1 was accepted. And the researcher also found that the eleventh-grade learners at SMA Negeri 3 Polewali Mandar were interested in teaching writing performance. It was proved by the mean score of the questionnaire was 80.21 and it was classified in the interesting category.
THE INFLUENCE OF USING DIGITAL STORY TELLING AND MOTIVATION ON SPEAKING SKILL OF ELEVENTH- GRADE STUDENTS OF SMA NEGERI 1 SIMPANG
Authors: Kamila Insana , Syahri Indawan , Mulyadi Mulyadi 
Published: March 2022

This research is to find out the influence of using digital storytelling and motivation on speaking skill of eleventh-grade students of SMA Negeri 1 Simpang. Out of 66 students, 34 students were selected as sample. The data were taken form questionnaire and oral test. This test was analyzed by using descriptive statistic, normality, homogeneity, pair sample t-test, independent sample t-test and two-way ANOVA. On tow way ANOVA result by SPSS 22, interaction’s score was 0.006 smaller than level of significant score was 0.05. For the result got interaction effect of Digital Storytelling and Motivation on student’s speaking ability. Based on data analysis, student’s speaking skill taught using Digital Storytelling approach increased significantly. Digital Storytelling was effective to improve student’s speaking skill in the experimental group.
Analisis Perbedaan Harga Saham Antara Sebelum dan Sesudah Pandemi Covid-19
Authors: Febriani Dita Dwi , Azib Asroi  
Published: March 2022

ABSTRACT- This study aims to examine and analyze the difference in stock prices between before and after the Covid-19 pandemic. In early March 2020 there was an outbreak of a virus called the Covid-19 pandemic. The outbreak caused the Jakarta Composite Index (ISHG) to weaken. Issues surrounding the Covid-19 pandemic are very vulnerable to affecting the stock market. However, stock trading activities are still valid and carried out. The research method uses descriptive and verificative, data collection techniques through secondary data from the annual report. The research sample consisted of 30 companies in the financial, hotel and tourism, transportation, pharmaceutical, and retail sub-sectors listed on the Indonesia Stock Exchange (IDX), the sampling method used was purposive sampling. The results showed that descriptively the development of stock prices in the financial, hotel and tourism, transportation, and retail sub-sectors experienced fluctuations which tended to decrease between before and after the Covid-19 pandemic, while only stock prices in the pharmaceutical sub-sectors experienced fluctuations which tended to increase. between before and after the Covid-19 pandemic. The verificatively shows that there are significant differences between stock prices in the financial, hotel and tourism, transportation, pharmaceutical, and retail sub-sectors before and after the Covid-19 pandemic, this is obtained from hypothesis testing using the Paired Sample t-Test.
Abstrak- Penelitian ini bertujuan untuk menguji dan menganalisis perbedaan harga saham antara sebelum dan sesudah pandemi Covid-19. Pada awal bulan maret tahun 2020 terjadi wabah virus yang disebut pandemi Covid-19. Adanya wabah ini menyebabkan Indeks Harga Saham Gabungan (ISHG) melemah. Isu seputar pandemi Covid-19 sangat rentan mempengaruhi bursa. Meski demikian, aktivitas perdagangan saham tetap berlaku dan dijalankan. Metode penelitian menggunakan deskriptif dan verifikatif, teknik pengumpulan data melalui data sekunder dari annual report. Sampel penelitian sebanyak 30 perusahaan pada sub sektor keuangan, hotel dan pariwisata, transportasi, farmasi, dan retail yang terdaftar di Bursa Efek Indonesia (BEI), metode pengambilan sampel menggunakan purposive sampling. Hasil penelitian menunjukan bahwa secara deskriptif perkembangan harga saham pada sub sektor keuangan, hotel dan pariwisata, transportasi, dan retail mengalami fluktuasi yang cenderung menurun antara sebelum dan sesudah pandemi Covid-19, sedangkan hanya harga saham pada sub sektor farmasi yang mengalami fluktuasi yang cenderung meningkat antara sebelum dan sesudah pandemi Covid-19. Adapun secara verifikatif menunjukkan bahwa terdapat perbedaan signifikan antara harga saham pada sub sektor keuangan, hotel dan pariwisata, transportasi, farmasi, dan retail sebelum dan pasca pandemi Covid-19, hal tersebut diperoleh dari pengujian hipotesis menggunakan Paired Sample t-Test.