Talenta Conference Series: Science and Technology (ST)最新文献

{"title":"Analisis dan Karakterisasi pada Pembuatan Genteng Polimer dengan Limbah Pulp Dregs sebagai Agregat dan Resin Epoksi sebagai Perekat","authors":"Kurnia Sembiring, Awan Maghfirah","doi":"10.32734/st.v2i2.489","DOIUrl":"https://doi.org/10.32734/st.v2i2.489","url":null,"abstract":"Pembuatan genteng polimer telah menggunakan limbah pulp dregs dengan komposisi campuran yang terbaik dari pembuatan genteng polimer tersebut. Sampel dari beberapa komposisi yang dibuat lalu di-press pada hot compressor dengan suhu 150 derajat celcius selama 30 menit. Setelah sampel dibuat, maka dilakukan pengujian sifat fisis dan sifat mekanis, uji permukaan yaitu SEM, uji DSC, uji DTA dan uji absorbsi dari XRD. Hasil penelitian menunjukkan penambahan limbah pulp dregs menghasilkan daya serap air dan porositas semakin rendah, sementara kuat lentur dan impak semakin tinggi. Hasil dari DSC dan DTA terlihat bahwa sampel mempunyai ketahanan dari 300 derajat celcius sampai dengan 470 derajat celcius, sedangkan untuk SEM terlihat bahwa bentuk permukaan dari beberapa sampel kurang homogen. Hasil dari absorbsi menggunakan XRD maka terlihat bahwa sampel menyerap sesuai dengan masing-masing sampel, yaitu semakin banyak pertambahan limbah pulp dregs maka intensitas penyerapan semakin besar. Hasil dari penelitian ini dapat disimpulkan genteng polimer yang dihasilkan sangat sesuai dengan sifat-sifat fisis dan sifat mekanis yang diperlukan dari genteng polimer standar. \u0000  \u0000The making of polymer had used waste pulp dregs with the best mixed composition of the polymer genteng. Samples of some compositions were made and then pressed on a hot compressor with a temperature of 150 degrees Celsius for 30 minutes. After the sample made, the physical properties and mechanical properties were tested, surface test with SEM, DSC test, DTA test and absorption test from XRD. The results showed that the addition of pulp dregs resulted in lower water absorption and porosity, while the bending strength and impact were higher. Results from DSC and DTA showed that the sample had a resistance of 300 degrees Celsius to 470 degrees Celsius, while for SEM, it appeared that the using XRD, it was seen that the sample absorbed in accordance with each sample, the more increase of pulp dregs waste, the greater the absorption intensity. The results of this study could be concluded that the polymer genteng produced was very suitable with the physical properties and mechanical properties required of standard polymer genteng.","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116941750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluasi Kontribusi Pengelolaan Laboratorium dan Motivasi Belajar Siswa Terhadap Efektivitas Proses Pembelajaran Kimia di SMA Kota Jambi dan Muaro Jambi","authors":"Fuldiaratman, Ngatijo","doi":"10.32734/st.v2i2.525","DOIUrl":"https://doi.org/10.32734/st.v2i2.525","url":null,"abstract":"Laboratorium diperlukan sebagai tempat belajar untuk memberikan pengalaman nyata kepada siswa sebagai salah satu faktor pendukung pelaksanaan pembelajaran. Kegiatan laboratorium tidak hanya bertujuan untuk meningkatkan pemahaman teoritis, tetapi siswa dapat menemukan dan membangun pengetahuan mereka sendiri. Penelitian ini menganalisis kontribusi manajemen laboratorium dan motivasi belajar siswa bersama-sama terhadap efektivitas proses pembelajaran kimia di SMA Kota Jambi dan Muara Jambi. Metode penelitian ini adalah metode survei dengan pendekatan kuantitatif terhadap tiga SMA Negeri dan satu SMA Swasta di Jambi dan Muaro Jambi dengan sampel 100 siswa. Instrumen berupa lembar observasi dan kuesioner dengan skala Likert. Teknik analisis korelasi yang digunakan adalah Korelasi Pearson. Hasil penelitian di tiga SMA Negeri dan satu SMA Swasta di Kota Jambi dan Kabupaten Muaro Jambi menunjukkan bahwa: 1) Manajemen laboratorium tidak cukup baik; 2) Motivasi siswa kriteria baik; 3) Efektivitas proses pembelajaran kimia bukanlah kriteria yang baik; 4) Kontribusi manajemen laboratorium terhadap efektivitas proses pembelajaran menunjukkan tingkat kontribusi yang rendah; 5). Kontribusi motivasi belajar siswa terhadap efektivitas proses pembelajaran menunjukkan tingkat kontribusi yang tinggi; 6) Kontribusi manajemen laboratorium sains dan motivasi belajar siswa terhadap efektivitas proses pembelajaran menunjukkan tingkat kontribusi yang rendah. \u0000  \u0000Laboratories are needed as a place to learn to provide real experience to students as one of the supporting factors of learning implementation. Laboratory activities not only aim to improve theoretical understanding, but students can discover and build their own knowledge. This study analyzed the contribution of laboratory management and student learning motivation together to the effectiveness of chemistry learning process in SMA Kota Jambi and Muara Jambi. This research method is survey method with quantitative approach to 3 SMA Negeri and 1 Private High School in Jambi and Muaro Jambi with sample 100 students. Instruments in the form of observation sheets and questionnaires with Likert scale. Correlation analysis technique used is Personal Product Moment Correlation. Research results in 3 State Senior High School and 1 Private High School in Jambi City and Muaro Jambi Regency indicate that: 1) Laboratory management is not good enough; 2) Student motivation good criteria; 3) The effectiveness of chemical learning process is not good criteria; 4) The contribution of laboratory management to the effectiveness of the learning process shows a low contribution level; 5). The contribution of students' learning motivation to the effectiveness of the learning process shows a high contribution level; 6) The contribution of science laboratory management and students' learning motivation to the effectiveness of the learning process shows a low contribution level","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124259052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identifikasi Daerah Rawan Longsor Di Sekitar Wilayah Kerja Pertambangan (WKP) Panas Bumi","authors":"Linda Handayani, Alamta Singarimbun","doi":"10.32734/st.v2i2.494","DOIUrl":"https://doi.org/10.32734/st.v2i2.494","url":null,"abstract":"Eksplorasi potensi panas bumi diklaim sebagai tambang ramah lingkungan, artinya tidak terlalu banyak merusak dan membahayakan lingkungan.Sejatinya benar, namun daerah panas bumi selalu berafiliasi dengan topografi yang sangat kasar, lerengnya terjal, dan jarang dijumpai tanah datar yang luas.Hal ini menyebabkan daerah di sekitar panas bumi rawan terhadap tanah longsor.Jenis batuan yang mudah lepas-lepas, membuat tingkat kerawanan terhadap kemungkinan tanah longsor semakin meningkat.Mengingat daerah panas bumi adalah daerah yang rawan terhadap bencana tanah longsor, maka perlu dilakukan pemetaan daerah rawan longsor untuk meminimalkan korban dan kerugian akibat bencana tersebut. Berdasarkan analisis, di sekitar daerah prospek panas bumi, 4,91% adalah daerah yang sangat rawan terhadap bencana longsor, 48,66% masuk dalam kategori rawan longsor, dan hanya 46,43% saja daerah yang tidak rawan terhadap bencana longsor. \u0000  \u0000Exploration of geothermal claimed as enviromental friendly mining, means that not too destroy and not dangerous for environment. Exactly true, but geothermal prosect always has afiliation with rude topography, steep slope, and hard to find flat area. This is cause area around geothermal prospect prone to landslide. Rock types of that area also easily unravel, this make the level of vulnerability to the possibility of landslides increases. Because of the prone of landslide, so need to do mapping of that area to minimize the loss and victim caused by that disaster. Based on the analysis using probabilistic method frequency ratio, around geothermal prospect, 4,91% is very prone to landslides, 48,66% prone to landslide, and just 46,43%area which safe area.","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124659232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biosorpsi Ion Zink (II) dari Larutan Berair menggunakan Kulit Pisang (Musa paradisiaca) sebagai Low-cost Biosorbent","authors":"Edi Nasra, Desy Kurniawaty, Bahrizal, Reni Puspita Sari","doi":"10.32734/st.v2i2.499","DOIUrl":"https://doi.org/10.32734/st.v2i2.499","url":null,"abstract":"Adsorpsi Zn (II) daril arutan berair menggunakan kulit pisang (Musa paradisiaca) sebagai biosorben telah dikaji dengan menggunakan metode kolom. Proses adsorpsi dikaji terhadap beberapa parameter,seperti pH, konsentrasil arutan Zn (II) mula-mula, massa biosorben, ukuran partikel biosorben dan laju alir. Kondisi optimum proses adsorpsi Zn (II) dengan biosorben kulit pisang berlangsung pada pH 3 dengan konsentrasi larutan Zn (II) mula-mula 500 mg/L, massa biosorben 0,6 g, ukuran partikel biosorben 250 µm dan laju alir 2 mL/min memiliki kapasita sadsorpsi 7,8567 mg/g. Berdasarkan hasil penelitian dapat disimpulkan bahwa kulit pisang, sebagai limbah, memiliki potensi yang baik sebagai biosorben untuk menyerap logam berat, seperti seng (Zn) dari perairan. \u0000  \u0000The removal of Zn (II) from aqueous solutions using banana (Musa paradisiaca) shell as biosorbent has been studied with column method. The parameters of adsorption such as pH, initial concentration, biosorbent dose, particle size and flow rate were investigated. The optimum condition was at pH=3, concentration 500 mg/l, biosorbent dose 0,6 g, 250 μm particle size and 2 ml/min flow rate with adsorption capacity 7,8567 mg/g. This study concluded that banana shell, a waste material, have good potential as biosorbent to remove toxic metals like zink from water.","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115027878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengembangan Materi Ajar Elektrolit Terintegrasi Model Poe (Predict, Observe, Explain) Untuk Menunjang Proses Pembelajaran Kimia Kelas X SMA/MA","authors":"Erviyenni, B. Holiwarni, S. Haryati","doi":"10.32734/st.v2i2.523","DOIUrl":"https://doi.org/10.32734/st.v2i2.523","url":null,"abstract":"Penelitian ini merupakan penelitian pengembangan untuk menghasilkan perangkat pembelajaran sebagai bahan dasar elektrolit melalui model 4-D yang meliputi Definisi, Desain, Pengembangan, dan Penyebaran. Penelitian dilakukan di Laboratorium Program Studi Pendidikan Kimia PMIPA Fakultas Keguruan dan Ilmu Pendidikan Universitas Riau. Objek penelitian ini adalah bahan ajar pada model POE elektrolit terintegrasi. Teknik analisis data yang digunakan dalam penelitian ini ialah analisis statistik deskriptif, dengan menghitung persentase nilai validasi oleh validator. Skor rata-rata dari lima aspek seperti kelayakan konten, presentasi, didaktik, konstruksi (linguistik) dan teknis (grafik), masing-masing memiliki nilai kelayakan sebesar 93,33%, 90%, 88,33%, dan 90%. Validasi skor totalitas adalah 92,33% artinya bahan ajar yang dikembangkan layak digunakan dalam pembelajaran kimia. \u0000  \u0000This research is a develop research was to produce learning devices as the electrolyte basic materials through 4-D model which includes Definition, Design, Develop, and Disseminate. Research conducted in the Laboratory of the Department of Study Program of Chemistry Education PMIPA the Faculty of Teacher Training and Education University of Riau. The object of this research was the lesson materials on the electrolyte integrated POE model. The data analysis techniques used in the study was descriptive statistical analysis, by calculating the percentage of validation value by validator. The average score of the five aspects such as the content properness, presentation, didactic, construction (linguistic) and technical (graphical) respectively has a value of eligibility 93.33%, 90%, 88.33%, and 90%. Totality score validation is 92.33% meaning the study materials developed is proper be use in chemistry learning.","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133392907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sintesis Zeolit Terlapis Cupferron dan Aplikasinya Sebagai Adsorben Cu(II)","authors":"Ngatijo, Faizar Farida, Purmaida S Sihombing, R. Basuki","doi":"10.32734/st.v2i2.498","DOIUrl":"https://doi.org/10.32734/st.v2i2.498","url":null,"abstract":"Zeolit-cupferron berhasil disintesis yang dikonfirmasi dengan data FT-IR, XRD dan SSA. Zeolit-cupferron disintesis dengan teknik pencampuran antara zeolite teraktivasi dan cupferron dengan rasio 0,5; 1,0; dan 1,5 : 10 (g :mL) selama 2 jam dan campuran yang dipeorleh dipisahkan dengan teknik sentrifugasi dan dikeringkan pada 50oC. Berdasarkan hasil analisis, luas permukaan spesifik zeolite pasca pelapisan dengan cupferron mengalami penurunan, namun ukuran pori mengalami peningkatan. Kristalinitas zeolite pasca pelapisan tidak mengalami perubahan yang signifikan tetapi berdasarkan analisis FT-IR keberadaan cupferron pada permukaan zeolite dapat dikonfirmasi. Rasio terbaik antara zeolite dan cupferron adalah 1,5 : 10. Kondisi optimum untuk aplikasi material zeolite-cupferron sebagai adsorben untuk Cu (II) adalah pada pH 5. \u0000  \u0000Zeolite-cupferron was successfully synthesized based on FT-IF, XRD, and SSA analysis. Zeolite-cupferron was synthesized by mixing technique by mixing the activated zeolite and cupferron at ratio 0,5, 1,0, and 1,5 : 10 (g:mL) for 2 h stir and then the mixture was centrifuged and dried at 50 °C. The result was the specific surface area of zeolite after coating by cupferron was decrease, hoever the pore size was increasing. Crystallinity after coating was not changed significantly but from FT-IR analysis reinforce the presumption that cupferron coated on zeolite. The best ratio of zeolite (g) and cupferron (mL) was 1,5:10. Application of zeolite-cupferron in adsorption Cu(II) onto this material optimum at pH = 5.","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114941396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimasi Suhu Reservoar Menggunakan Geotermometer (Studi Kasus Lapangan Panas Bumi Jaboi, Sabang)","authors":"M. Isa, Khairi Suhud","doi":"10.32734/st.v2i2.488","DOIUrl":"https://doi.org/10.32734/st.v2i2.488","url":null,"abstract":"Gunung api Leumo Matee dan Seumeuregoh, Jaboi Sabang memiliki potensi energi panas bumi sangat besar. Hal ini ditandai dengan adanya manifestasi yang muncul di permukaan seperti uap panas, fumarol dan sumber air panas. Namun demikian, potensi panas bumi ini belum dimanfaatkan secara optimal oleh pihak-pihak terkait. Oleh karena itu, perlu dikaji lebih dalam dan menyeluruh untuk mendapatkan informasi yang detail, terutama parameter suhu dan karakteristik batuan/mineral. Metode untuk penentuan potensi panas bumi secara umum meliputi kajian geologi, geofisika dan geokimia. Pada penelitian ini difokuskan pada kajian geokimia khususnya analisis kimia fluida panas bumi. Pendekatan untuk menentukan karakteristik fluida kimia panas bumi dilakukan dengan metode penentuan geotermometri  untuk air (SiO2) dan gas (Na-K). Berdasarkan data pengamatan lapangan dan uji laboratorium yang terstandarisasi menunjukkan bahwa suhu bawah permukaan untuk fluida cair 222 oC dan 201 oC, sedangkan untuk gas 220 oC dan 204 oC. Hasil pengujian sampel fluida panas bumi menunjukkan bahwa konsentrasi K+ =10,90 mg/L, konsentrasi Mg2+ = 64,50 mg/L, konsentrasi Ca2+ = 279,45 mg/L, konsentrasi Na+ =75,85 mg/L konsentrasi Cl- =7,45 mg/L, konsentrasi SO4- =5477,74 mg/L, dan  konsentrasi HCO3- = 0 mg/L. Berdasarkan interpretasi data-data tersebut terutama yang berkaitan dengan suhu reservoar yang diperoleh dengan dua pendekatan formula menunjukkan bahwa manifestasi panas bumi daerah Jaboi, Sabang sangat prospek untuk dikembangkan sebagai energi terbarukan dan ramah lingkungan. \u0000  \u0000The Volcano of Leumo Matee-Seumeuregoh in Jaboi, Sabang has a massive potential geothermal energy. This is indicated by the manifestation geothermal to surface such as hot steam, fumaroles and hot springs. Nevertheless, this potential geothermal has not been utilized optimally by stakeholders. Therefore, it is important to be deeply and holistically studied to get of detailed information, especially on the temperature parameter and the mineral characteristic. The method used to determine geothermal potency generally includes geological, geophysical and geochemical studies. However in this research geochemical study is more focused, especially the chemical analysis of geothermal fluid. The approach to determine the characteristic of geothermal chemical fluid is conducted by geothermometry technique for water (SiO2) and gas (Na-K). Based on the field observation data and the standardized laboratory test show that the subsurface temperature of liquid fluid is around 222 and 201 oC and gas is around 220 oC and 204 oC. The analysis of hot spring sample shows potassium (K+) concentration of 10.90 mg/L, magnesium (Mg2+) concentration of 64.50 mg/L, calcium (Ca2+) concentration of 279.45 mg/L, sodium (Na+) concentration of  75.85 mg/L, chloride (Cl-) concentration of 7.45 mg/L, sulfat (SO4=) concentration of  5477.74 mg/L, and bicarbonate (HCO3-) concentration of 0 mg/L. Based on the data, especially temperature tha","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114953311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengaruh Pendopingan Karbon Terhadap Struktur Kristal dan Morfologi TIO2","authors":"Frastica Deswardani, Helga Dwi Fahyuan, R. Gultom, Eif Sparzinanda","doi":"10.32734/st.v2i2.492","DOIUrl":"https://doi.org/10.32734/st.v2i2.492","url":null,"abstract":"Telah dilakukan penelitian mengenai pengaruh konsentrasi doping karbon pada lapisan tipis TiO2 yang ditumbuhkan dengan metode spray terhadap struktur kristal dan morfologi TiO2. Hasil karakterisasi SEM menunjukkan bahwa penambahan doping karbon dapat meningkatkan ukuran butir. Lapisan TiO2 doping karbon 8% diperoleh ukuran butir terbesar adalah 1.35 μm, sedangkan ukuran tekecilnya adalah 0.45 μm. Sementara itu, untuk lapisan tipis TiO2 didoping karbon 15% memiliki ukuran butir terbesar yaitu 1.76 μm dan terkecil 0.9 μm. Hasil XRD menunjukkan seluruh puncak difraksi lapisan tipis TiO2 dengan doping karbon 8% dan 15% merupakan TiO2 anatase. Ukuran kristal lapisan TiO2 didoping karbon 8% diperoleh sebesar 638,08 Å dan untuk pendopingan 15% karbon ukuran kristal lapisan tipis TiO2 adalah 638,09 Å, hal ini menunjukkan ukuran kristal kedua sampel tidak mengalami perubahan yang signifikan. \u0000  \u0000TiO2 thin film with carbon doping has been successfully grown by spray method. The research on the effect of carbon doping on crystal structure and morfology of TiO2 has been prepared by varying carbon concentration (8% and 15% carbon). Analysis of SEM showed that the addition of carbon may increase the grain size. Thin film of TiO2 doped carbon 8% has the largest grain size 1.35 μm, while the smallest grain size is 0.45 μm. Meanwhile, for thin film TiO2 doped carbon 15% has the largest grain size 1.76 μm and smallest 0.9 μm. The XRD results showed the entire diffraction peak of thin film TiO2 doped carbon 8% and 15% were TiO2 anatase. The crystal size of thin film TiO2 doped carbon 8% was obtained at 638.08 Å and for thin film TiO2 doped carbon 15% the crystalline size of TiO2 thin film was 638.09 Å, this shows that the crystal size of both samples did not change significantly. \u0000  \u0000 ","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116512217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Peran Dosen Dalam Mengembangkan Karakter Mahasiswa","authors":"Sri Irawati, Irdam Idrus","doi":"10.32734/st.v2i2.550","DOIUrl":"https://doi.org/10.32734/st.v2i2.550","url":null,"abstract":"Pendidikan pembangunan karakter saat ini tidak dapat dinegosiasikan untuk pembentukan karakter siswa di perguruan tinggi. Salah satu elemen penting dalam pendidikan karakter mahasiswa di perguruan tinggi adalah dosen. Dosen memiliki peran penting dalam pendidikan karakter di perguruan tinggi. Dalam menjalankan tugas utama Universitas Tri Dharma, yaitu melakukan pengajaran, penelitian, dan pengabdian kepada masyarakat, seorang dosen melakukan proses internalisasi nilai-nilai luhur yang kemudian menjadi budaya kampus. Dosen adalah aktor utama dalam pembentukan dan pengembangan karakter siswa dengan teladan. Sebelum mendidik karakter siswa, seorang dosen setidaknya memiliki karakter yang sesuai dengan tugas utama seorang guru. Selain itu, peran yang sangat penting yang tidak diabaikan adalah untuk mendidik, mengajar, melatih, membimbing, dan mengevaluasi. \u0000  \u0000Character building education today is non-negotiable for the character building of students in college. One important element in the character education of students in college is lecturers. Lecturers have an  important role in character education in college. In carrying out the main task of the Tri Dharma University, which is doing the teaching, research, and community service, a lecturer does a process of internalization of the noble values which later become the campus culture. Lecturers are the main actors in the formation and  development of the students’ character with exemplary. Before educating the students’ character, a lecturer at  least has the character corresponding to the main task of a teacher. In addition, a very important role of which is not overlooked is to educate, teach, train, guide, and evaluate. \u0000 ","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132266247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementasi Pembelajaran Langsung Untuk Meningkatkan Hasil Belajar Matematika","authors":"Nahor Murani Hutapea","doi":"10.32734/st.v2i2.476","DOIUrl":"https://doi.org/10.32734/st.v2i2.476","url":null,"abstract":"Pengamatan di lapangan umumnya menunjukkan bahwa prestasi siswa dalam matematika masih dikategorikan rendah. Hal ini dipicu aktivitas pembelajaran masih didominasi oleh guru (terpusat guru); siswa kurang berperan aktif dalam proses pembelajaran; dan siswa tidak diberi kesempatan untuk mengemukakan gagasan tentang apa pun yang berkaitan dengan konteks yang sedang dibahas dan siswa tidak diberi kesempatan untuk menggunakan kekuatan alasan mereka untuk menyelesaikan masalah. Untuk itu telah dilakukan penelitian tindakan dengan model siklus desain, melalui penerapan pembelajaran langsung; bertujuan untuk meningkatkan proses belajar dan untuk meningkatkan prestasi siswa dalam matematika. Penelitian dilakukan di SDN Negeri 67 Pematang Pudu di Kecamatan Mandau Kabupaten Bengkalis; Subjek penelitian adalah siswa kelas III dari 24 siswa dengan tingkat kemampuan heterogen. Instrumen penelitian terdiri dari satu set prestasi dalam tes matematika, lembar observasi, dan perangkat pembelajaran: silabus, rencana pelajaran, lembar bahan ajar, lembar latihan terbimbing dan lembar latihan lanjutan. Data kegiatan (guru, siswa) dianalisis secara deskriptif naratif; prestasi dalam tes matematika dengan statistik deskriptif. Hasil penelitian: aktivitas guru dan siswa; ada peningkatan proses pembelajaran setelah tindakan pada siklus pertama dan kedua; ada peningkatan jumlah persentase siswa dari skor dasar ke tes matematika 1 dari 16,66% dan dari tes matematika 1 ke tes matematika 2 dari 16,67%. Kesimpulan: penerapan pembelajaran langsung dapat meningkatkan prestasi belajar matematika siswa. \u0000  \u0000Observation in field generally shows that students’s achievement in mathematics are still categorized low. This is triggered of learning activity is still dominated by teacher (teacher center); students are less active role in learning process; and students aren’t given the opportunity to put forward ideas about anything related to the context being discussed and students aren’t given the opportunity to use the power of their reason to solve problems. For it has been done action research with design cycle model, through implementation of direct learning; aimed to improve learning process and to improve students’s achievement in mathematic. The study was conducted in public elementary school nomber 67 Pematang Pudu in Mandau sub-districts Bengkalis Regency; subject are students of grade III of 24 students with heterogeneous ability level. The research instrument consists of one set of achievement in mathematic test, observation sheets, and learning devices: syllabus, lesson plan, teaching material sheet, guided exercise sheet and advanced exercise sheet. Data of activities (teacher, students) were analyzed by narrative descriptive; achievement in mathematic test by statistic deskriptif. Research outcomes: activity of teacher and students; there were improvment of learning process after action on the first and second cycles; there were improvement of percentage amount students’s ","PeriodicalId":117967,"journal":{"name":"Talenta Conference Series: Science and Technology (ST)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128538617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}