bluuebunny/crossref_metadata_2025_split huggingface dataset:
PEMERATAAN ENERGI GELOMBANG LAUT DENGAN SISTEM BERPISTON AKSI GANDA
Authors: Adi Sayoga I Made , Nuarsa I Made 
Published: January 2018

Semakin menipisnya cadangan minyak dunia menyebabkan harga bahan bakar minyak (BBM) terus melambung. Kondisi ini menyebabkan masalah yang serius yang perlu diatasi. Potensi energi yang diperbaharui seperti : energi angin, matahari dan gelombang laut perlu segera dilirik walaupun mungkin sudah terlambat. energi potensial dan kinetik yang terkandung pada gelombang laut dapat dikonversikan untuk pemanfaatan tenaga listrik maupun pompa air bersih dan irigasi. Tujuan penelitian adalah untuk memanfaatkan potensi energi gelombang untuk dikonversi menjadi tenaga listrik. Adapun manfaat penelitian ini adalah akan diperoleh metode dan sumber energi alternative yang ramah lingkungan serta tidak membutuhkan bahan bakar minyak. Energi alternatif ini ditunggu pemanfaatannya oleh masyarakat. Kegiatan penelitian diawali dengan studi literatur untuk mengkaji penelitian yang terdahulu, mencari perumusan dengan teori yang ada. Hasil studi literatur dilanjutkan membuat disain atau rancangan alat dengan perhitungan–perhitungan. Perhitungan mengacu pada prinsip pemanfaatan energi gelombang laut semaksimal mungkin. Dari perhitungan tersebut sangat menentukan langkah selanjutnya seperti pembuatan bentuk, pemilihan bahan, menentukan alat ukur dan model pengukuran. Konversi energi dari gelombang ke piston yang paling efektif terjadi pada saat pelampung (piston) diberikan beban W setengah dari Fa Total (W=Fa/2 total) dibandingkan pada saat tak berbobot (W=0) maupun pada saat piston diisi penuh (W=Fa total). Dari hasil pengujian ternyata prototype pemerataan gelombang laut dengan sistem aksi ganda mampu menghasilkan energi listrik. Pada saat gelombang naik, energi gelombang menekan tuas melalui pelampung yang selanjutnya memutar roda gigi yang telah terhubung dengan generator listrik. Sedangkan pada saat gelombang turun roda gigi juga berputar akibat berat pelampung yang telah diiisi pemberat air.
REDAMAN SUARA PADA KOMPOSIT SANDWICH POLYESTER BERPENGUAT SERAT SISAL DENGAN CORE STYROFOAM
Authors: Sinarep S. , Catur Agus Dwi , Hafidzul M. 
Published: January 2018

Penggunaan serat alam pada kulit komposit sandwich dalam sekat bangunan perlu diteliti kemampuannya untuk menyerap energi suara pada beberapa frekuensi suara target. Bahan penelitian ini adalah serat sisal anyam, resin polyester, styrofoam. Komposit dibuat dengan metode hand lay-up. Komposit sandwich polyester tersusun dari dua skin dengan core ditengahnya. Fraksi volume serat komposit sandwich polyester sebagai skin adalah 30 %. Core yang digunakan ada 2 macam variasi ketebalan yaitu 30 mm dan 40 mm. Spesimen dan prosedur pengujian koefisien redaman suara mengacu pada standar ASTM E1050.Hasil rata-rata redaman suara yang besar terdapat pada spesimen komposit sandwich dengan ketebalan core 30 mm dengan hasil yang fluktuatif pada kenaikan tingkat frekuensi pegujian. Pada frekuensi rendah 250 Hz dengan nilai redaman 0,809 yang dilapisi kain beludru, frekuensi sedang 750 Hz dengan nilai redaman 0,819 yang dilapisi karpet, dan pada frekuensi tinggi 1500 Hz dengan nilai 0,725 yang dilapisi kain beludru.
STUDI KELAYAKAN PENGGUNAAN MESIN DIESEL DENGAN METODE BREAK EVEN POINT (BEP) DAN ANALISIS SENSITIVITAS PADA PLTD (Studi Kasus : PT PLN Persero Sektor Pembangkitan Lombok PLTD Ampenan)
Authors: Wijana Made , Triadi A.A. Alit , Anwar Lalu Syahrul 
Published: January 2018

This study intended to analyze the feasibility of the use of the Power Plant (PLTD) of Ampenan using the break even point (BEP) and sensitivity analysis. That there are several alternatives that can be taken are: first, if the use of the selling price to the public's ability to Rp. 800 per kWh and a subsidy of Rp. 29.758.612.278 per month, then power plant will have a turnover in the month to 12 to earn a revenue of Rp. 159.148.857.478. Secondly, if the use of the selling price to Rp. 900 per kWh and a subsidy of Rp. 28.100.809.978 per month, then power plant will have a turnover in the month to 12 to earn a revenue of Rp. 179.042.464.663. Thirdly, if the use of the selling price to Rp. 1000 per kWh and a subsidy of Rp. 26.443.007.678 per month, then power plant will have a turnover in the month to 12 to earn a revenue of Rp. 199.936.071.847. Then the results of research using sensitivity analysis to changes in the initial investment is known that the increase in initial investment 600,83% below power plant is still feasible to operate.. But the power plant would not be feasible to operate when the increase 600,83% above the initial investment.Furthermore the sensitivity analysis to changes in income are known to decrease in revenue of less than 85,73% of power plant is still worth operating. But if the decline in revenue was down more than 85,73% power plant operation is not feasible.
STUDI KOMPARASI HASIL BELAJAR KIMIA PADA MATERI KOLOID MENGGUNAKAN MODEL PEMBELAJARAN BERBASIS PROYEK DAN MODEL PEMBELAJARAN BERBASIS MASALAH SISWA KELAS XI IPA MAN 2 MATARAM TAHUN AJARAN 2013/2014
Authors: Hesti Safitri Eka , Siahaan Jeckson , Wahidah Al Idrus Syarifa 
Published: January 2018

Abstrak: Penelitian ini merupakan penelitian quasi experimental (eksperimen semu) menggunakan Post-test Only Nonequivalent Control Group Design yang bertujuan untuk mengetahui ada atau tidaknya perbedaan hasil belajar kimia siswa menggunakan model pembelajaran berbasis proyek dan model pembelajaran berbasis masalah di kelas XI IPA MAN 2 Mataram Tahun Ajaran 2013/2014.Sampel penelitian diambil dengan teknik Purposive Sampling dan terpilih dua kelas sebagai kelas eksperimen, yaitu kelas XI IPA U1 (kelas ekperimen 1) dan kelas XI IPA U2 (kelas ekperimen 2).Data hasil belajar kognitif diperoleh melalui tes tertulis (post test) yang dianalisis menggunakan uji beda (uji t). Hasil penelitian menunjukkan bahwa pada kelas eksperimen I diperoleh nilai rata-rata 67 dengan ketuntasan klasikal 7,69%sedangkan pada kelas eksperimen II diperoleh nilai rata-rata 70 dengan ketuntasan klasikal 28,57%. Hasil uji-t dua pihak pada taraf signifikan 5% diperoleh thitung = -0,4709dan ttabel = 2,060, sehingga thitungberada pada daerah penerimaan adalah Ho diantara -2,060 dan +2,060 yang berarti Ho pada penelitian ini diterima. Hal ini menunjukkan bahwa tidak terdapat perbedaan yang signifikan hasil belajar kimia antara siswa yang diterapkan model pembelajaran berbasis proyek dan model pembelajaran berbasis masalah siswa kelas XI IPA MAN 2 Mataram Tahun Ajaran 2013/2014.Kata kunci: Koloid, Model pembelajaran berbasis proyek,Model pembelajaran berbasis masalahÃÂ Abstract: The aims of this quasi experimental researchÃÂ is ÃÂ to compare the chemistry study result by using the project based learning model and problem based learning model at class XI science of MAN 2 Mataram in academic year 2013/2014. Sample of this research were class XI science U1 as experiment I class and class XI science U2 as experiment II class which taken by using purposive sampling technique.Data cognitive of the result study obtained through a written test (post-test) were analyzed using a different test (t test). The results showed that the experimental class I obtained an average value of 67 with classical completeness of 7.69% while the experimental class II obtained an average value of 70 with classical completeness 28.57%. T-test results of the unequal sample at the significant level of 5% was obtainedÃÂ tcalculation =-0,4709 andttable= 2,060, with the result that tcalculationin the range from to -2,060 and +2,060which means that the Ho in this research is approved. In conclusion, there is no significant difference in result study between students who are taught chemistry using project-based learning model and the problem based learning model students of class XI IPA 2 Mataram MAN inÃÂ Academic Year 2013/2014.Key words: Colloid, project based learning model, the problem based learning model.
PENERAPAN FREUNDLICH MODEL PADA ADSORPSI-REDUKTIF ISOTHERM AUCL4ÃÂ¯ DENGAN ASAM
Authors: Ismillayli Nurul , Santosa Sri Juari , Siswanta Dwi 
Published: January 2018

Abstrak: Telah dilakukan adsorpsi reduktif isotherm AuCl4ÃÂ¯ dengan menggunakan asam humat hasil isolasi tanah gambut Rawa Pening, Ambarawa. Isolasi dilakukan melalui perendaman alam 0,1 M NaOH dan dilanjutkan dengan pemurnian menggunakan 0,1 M HCl/0,3 M HF. Asam humat hasil isolasi dikarakterisasi menggunakan spektroskopi inframerah, ditentukan kadar abunya dan diaplikasikan untuk adsorpsi reduksi isotherm larutan AuCl4ÃÂ¯. Hasil karakterisasi menunjukkan bahwa asam humat hasil isolasi memiliki gugus Ã¢â¬âCOOH, -OH fenolik, hidrokarbon alifatik dan aromatis dengan kadar abu sebesar 1,13%. Data adsorpsi AuCl4ÃÂ¯ ÃÂ dengan menggunakan asam humat lebih menunjukkan kecocokan dengan persamaan Freundlich di banding Langmuir, dengan harga R=0,92, n=1,7184 dan log KF= 4,1707. Reduksi Au(III) menjadi Au(0) oleh asam humat dikonfirmasi dengan munculnya puncak tajam baru dengan nilai 2ÃÂ¸ =38, 44, 64 dan 77ÃÂ° yang merupakan puncak karakteristik dari partikel emas.ÃÂ Kata kunci: adsorpsi reduktif isotherm, AuCl4ÃÂ¯, asam humat, Freundlich.ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ Abstract: Isotherm adsorption reductive of AuCl4ÃÂ¯ by using isolated humic acid of Rawa Pening peat soil, Ambarawa had been conducted. Isolation was done by soaking peat soil in 0.1 M NaOH and following by purification in 0.1M HCl/0.3 HF. The isolated humic acid was characterized using infrared spectroscopy, determined its ash contain and aplicated for isotherm adsorption reductive of AuCl4ÃÂ¯. FTIR spectra indicated that isolated humic acid consist of COOH group, phenolic Ã¢â¬âOH, aliphatic hydrocarbon and aromatic ring, its ash content was 1.13%. Asorption data of AuCl4ÃÂ¯ÃÂ showed more suitable for Freundlich model than Langmuir model, with R=0,92, n=1,7184 and log KF= 4,1707. Reduction of Au(III) to Au(0) was confirmed by appearance of sharp peak at 2ÃÂ¸ = 38, 44, 64 dan 77ÃÂ° as characteristic peak of gold particles.Keywords: Isotherm adsorption reductive, AuCl4ÃÂ¯ , humic acid, Freundlich.
PENGARUH MODEL PEMBELAJARAN KOOPERATIF NHT DAN STAD TERHADAP HASIL BELAJAR SIKAP SISWA SMA NEGERI 2 GERUNG
Authors: Aryana I. G. M. R. , Al Idrus Agil , Harjono Ahmad 
Published: January 2018

ABSTRAK: Penelitian ini bertujuan untuk mengetahui perbedaan hasil belajar sikap siswa antara kelompok siswa yang mendapatkan perlakuan model pembelajaran kooperatif NHT dan model pembelajaran kooperatif STAD pada pembelajaran biologi sistem pencernaan. Penelitian ini dilaksanakan di SMA Negeri 2 Gerung pada siswa kelas XI jurusan Ilmu Pengetahuan Alam semester genap tahun pelajaran 2014/2015. Penelitian ini merupakan penelitian kuasi eksperimen dengan menggunakan rancangan Type Between Group Design dengan Posttest Only Design. Populasi penelitian berjumlah 44 siswa terdiri atas dua kelas, dimana keseluruhan populasi dijadikan sebagai sampel penelitian. Melalui teknik simple random sampling ditentukan dua kelas eksperimen. Data yang diperoleh dianalisis dengan menggunakan analisis statistik deskriptif yaitu dengan menghitung rata-rata dari jawaban yang diberikan kemudian dinyatakan dalam bentuk angka persentase dari setiap pernyataan. Angka persentase yang menggambarkan sikap pada indikator: rasa ingintahu, tanggungjawab, dan disiplin diuji hipotesisnya menggunakan analisis uji-t dengan bantuan program SPSS versi 20 for Windows. Hasil penelitian menunjukkan bahwa tidak ada perbedaan hasil belajar sikap yang signifikan antara kelompok siswa yang menggunakan model pembelajaran kooperatif NHT dan model pembelajaran kooperatif STAD dimana diperoleh nilai thitung Ã¢â°Â¤ ttabel (p>0.05) pada setiap indikator sikap.ÃÂ Kata kunci: ÃÂ ÃÂ ÃÂ ÃÂ ModelÃÂ pembelajaran kooperatif NHT, STAD, hasil belajar sikap siswa.ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ABSTRACT: This study aims to determine differences of studentÃ¢â¬â¢s attitude learning outcomes between groups of students who receive NHT cooperative learning model and STAD cooperative learning model treatment for biology digestive system learning. This research was conducted at SMAN 2 Gerung in class of XI. This study is a quasi-experimental research using Type Between Group Design with Posttest Only Design. The number of population was 44 students consit of two classes, and all member of population used to sample study. By using simple random sampling obtained two classes of experiments. Data were analyzed using descriptive statistical and than with count the average of data, obtained scaling data and than hypothesis was tested using t-test analysis with SPSS version 20 for Windows. The results showed there was no significant difference about attitude learning outcome between the group the of students using NHT cooperative learning model and group of students using STAD cooperative learning model in all indicators of attitude that gained tcount Ã¢â°Â¤ ttable (p> 0.05).ÃÂ Key words: ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ NHT cooperative learning model, STAD, model, studentÃ¢â¬â¢s attitude, learning outcome.
PENGEMBANGAN MEDIA PEMBELAJARAN AUDIO VISUAL PROGRAM MICROSOFT POWER POINT PADA POKOK BAHASAN ORGANISASI KEHIDUPAN KELAS VIIA SMP NEGERI 19 MATARAM TAHUN PELAJARAN 2012/2013
Authors: Armyani Ida Ayu Putu , Martedi Didik 
Published: January 2018

Abstrak: Penelitian ini bertujuan untuk meningkatan aktivitas belajar SMP Negeri 19 Mataram dengan menggunakan media audio visual program power point. Program ini dapat memudahkan guru dalam menyampaikan konsep IPA, terutama konsep abstrak menjadi konsep yang konkrit sehingga bisa dinalar siswa, misalnya: organisasi kehidupan. Subyek pada penelitian ini berjumlah 47 siswa kelas VIIA SMP Negeri 19 Mataram. Pengambilan data mengunakan metode observasi, lembar tanggapan dan metode tes.penelitian dilakukan dengan dua siklus. Setiap siklus dilaksanakan dalam dua kali pertemuan. Tahapan tiap siklus meliputi perencanaan, pelaksanaan tindakan, observasi dan refleksi. Hasil penelitian pada siklus I, aktifitas siswa pada Proses Belajar Mengajar (PBM) hanya mencapai 51,06%, ketuntasan hasil belajar mencapai 68,77% sedangkan pada siklus II aktifitas siswa pada PBM sudah mengalami peningkatan yaitu mencapai 84,04%, ketuntasan hasil belajar mencapai 84,26%.Kata Kunci: media, aktivitas belajar, powerpoint.ÃÂ Abstract: This study aims to improve learning activities of SMP 19 Mataram students by using audio-visual powerpoint media. The media can facilitate teachers to convey the concept of science, especially the abstract concept into a concrete concept that can be rationalized by students, for example: organization of life. Subjects in this study were 47 students of grade VII of SMPN 19 Mataram. Retrieving data using the method of observation, response sheets and methods tes. This study was conducted in two cycles. Each cycle consisted of two sessions. Each cycle includes the stages of planning, action, observation and reflection. The results showed that at the first cycle, the student activity in learning process was only 51.06 %, learning outcomes mastery was 68.77 %, while in the second cycle, the students activity wash 84.04 %, learning outcomes mastery was 84.26 %.Key words: media, lerning activity, powerpoint
RESPON SISWA TERHADAP PENGEMBANGAN MEDIA MODEL KEMAGNETAN BUMI
Authors: Fikri Muh. Husnul , Doyan Aris , Harjono Ahmad 
Published: January 2018

This study aims to develop instructional media materials science magnetism at the junior level Models Earth Magnetism (MKB)media. The study was conducted by using the approach of Research and Development by Borg & Gall modified by Sukmadinata into 3 stages: a preliminary study, test models and test the product. Modeling exercise carried out in two stages. Limited test phase conducted at SMK Islam Nurul Hikmah Langko West Lombok and wider scale trials as well as the testing phase at SMPN 3 Lingsar. Of wider scale pilot phase characteristics obtained MKB media. At the end of the pilot phase conducted a broader scale questionnaire to get students' response in the development of MKB media at 20 students. Students responded positively to the development of MKB media. Keywords : Media Model of Earth Magnetism , Student Response.
SIFAT PENYERAPAN BUNYI PADA KOMPOSIT SERAT BATANG PISANG (SBP) – POLYESTER
Authors: Khotimah Khusnul , - Susilawati , Soeprianto Harry 
Published: January 2018

This research conducted to find the physical properties of the absorption of sound from banana stem fiber (Serat Batang Pisang/SBP) with polyesters’ matrix. The sound absorbent material made with a variety of different volume fraction composition. The comparison between the SBP and the volume fraction of the polyester is made of 30%: 70%, 40%: 60% and 50%: 50%. The method of research was done in three stages: making banana stem fiber, manufacturing composite and testing of composite SBP. Composite testing includes physical properties (sound absorption). Preparation of the samples started by taking a banana stem, decomposition banana stem fiber, alkali treatment with NaOH 4%, then mixing the SBP with the matrix polyester. Manufactured the composites by press the materials on the molding for 12 hours, then tested to find physical properties. Sound absorption test performed using a signal generator and a sound level meter with the principle of the impedance tube method through acoustic box approach as a reference. The results of the study showed that SBP with polyester composite capable to absorb the sound with sound absorption coefficient α = 0.84 at 50% fiber volume fraction. Thus SBP composites can absorb sound for low and medium frequency, based on the standard ISO 11654:1997 (E) where the minimum of sound absorption coefficient of acoustic materials is α = 0.15. Keywords: Composite, banana stem fiber, sound absorber materials, polyester.
PENGEMBANGAN PERANGKAT MODEL PEMBELAJARAN KUANTUM BERBASIS MASALAH DENGAN PENDEKATAN SAINTIFIK
Authors: Jayanti Mei Indra , Jufri A. Wahab , Ramdani Agus 
Published: January 2018

In the Law of the Republic of Indonesia Number 20 of 2003 on the national education system of article 1, paragraph 1 that education will be successful in learning activities where students are able to achieve the expected competencies of science and give a positive value to themselves. Critical thinking ability and reasoning ability is part of the high school biology course goals that can be developed through a student-centered learning, such as quantum learning, problem-based learning, and scientific approach. This study aimed to develop the quantum problem-based learning model packages and the quantum without problem-based learning (PKBM and PKTBM) with 4 and 6 stage of scientific approach toward critical thinking ability and reasoning ability in tenth grades. Process of development teaching and learning packages refers to the model Dick & Carey. Teaching and learning packages developed to biology course for the tenth grade of senior high school in ecological material. Data were collected by using instruments feasibility characteristics of teaching and learning packages. Data were analyzed using descriptive statistics. The results showed that the syllabus and the learning lesson plan (LLP) got a worthy category; worksheets, tests of critical thinking ability and tests of reasoning ability got a very worthy category to used in tenth grades of senior high school.Keywords: PKBM, PKTBM, scientific approach, critical thinking ability, reasoning ability
GASP. VII. Signs of Gas Inflow onto a Lopsided Galaxy
Authors: Vulcani Benedetta , Poggianti Bianca M. , Moretti Alessia , Mapelli Michela , Fasano Giovanni , Fritz Jacopo , Jaffé Yara , Bettoni Daniela , Gullieuszik Marco , Bellhouse Callum 
Published: January 2018

Abstract
Theoretically, inflowing filaments of gas are one of the main causes of growth for a galaxy. Nonetheless, observationally, probing ongoing gas accretion is challenging. As part of the Gas Stripping Phenomena in galaxies with MUSE (GASP) program, we present the analysis of a spiral galaxy at z = 0.04648 whose characteristics indeed are consistent with a scenario in which gas accretion plays a major role. The most salient indirect parts of evidence that support this picture are as follows: (1) The galaxy is isolated, and its position rules out the mechanisms expected in dense environments. (2) It shows a pronounced lopsidedness extending toward the west. According to the spatially resolved star formation history, this component was formed

ago. (3) It has many large and elongated H ii regions that are an indication of a fragmentation due to disk instability. (4) The stellar and gas kinematics are quite symmetric around the same axis, but in the gas the locus of negative velocities shows a convexity toward the east, as if new gas has been infalling with different orientation and velocity. (5) The metallicity distribution is inhomogeneous and shows exceptionally steep gradients from the center toward the outskirts, especially in the southwest side. (6) The luminosity-weighted age is generally low (∼8 Gyr) and particularly low (<7 Gyr) along a trail crossing the galaxy from southwest toward the north. It might trace the path of the accreted gas. These findings point to an inflow of gas probably proceeding from the southwest side of the galaxy.
A Breakout Model for Solar Coronal Jets with Filaments
Authors: Wyper P. F. , DeVore C. R. , Antiochos S. K. 
Published: January 2018

Abstract
Recent observations have revealed that many solar coronal jets involve the eruption of miniature versions of large-scale filaments. Such “mini-filaments” are observed to form along the polarity inversion lines of strong, magnetically bipolar regions embedded in open (or distantly closing) unipolar field. During the generation of the jet, the filament becomes unstable and erupts. Recently we described a model for these mini-filament jets, in which the well-known magnetic-breakout mechanism for large-scale coronal mass ejections is extended to these smaller events. In this work we use 3D magnetohydrodynamic simulations to study in detail three realizations of the model. We show that the breakout-jet generation mechanism is robust and that different realizations of the model can explain different observational features. The results are discussed in relation to recent observations and previous jet models.