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PENGARUH MODEL PEMBELAJARAN PROBLEM POSING TIPE PRE-SOLUTION POSING TERHADAP HASIL BELAJAR FISIKA DAN KARAKTER SISWA SMA Astra, I. M.; -, Umiatin; Jannah, M.
Jurnal Pendidikan Fisika Indonesia Vol 8, No 2 (2012)
Publisher : Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Semarang

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran Problem Posing Tipe Pre-Solution Posing terhadap hasil belajar Fisika siswa SMA dan karakter yang bisa dikembangkan. Penelitian ini menggunakan metode quasi eksperimen, populasi yang dipakai adalah seluruh peserta siswa di SMA Labschool Jakarta, dengan sampel dua kelas yang berasal dari kelas IX SMA Labschool Jakarta satu kelas sebagai kelas eksperimen dan kelas lainnya sebagai kelas kontrol. Melalui model pembelajaran ini juga dapat dikembangkan karakter siswa meliputi berfikir kreatif, kritis dan logis bekerja dengan teliti, jujur dan berperilaku santun serta keterampilan social seperti bekerja sama dan saling menghargai. Kesimpulannya adalah adanya pengaruh model pembelajaran Problem Posing tipe Pre-Solution Posing terhadap hasil belajar Fisika siswa, dimana kelas yang diajar dengan model Problem Posing tipe Pre-Solution Posing lebih besar dari pada kelas yang tidak diajar dengan model Problem Posing tipe Pre-Solution.The research was aimed to find out the effect of learning model of Problem Posing, Pre-Solution Posing Type, on the outcome of Physics Learning and the potentially developed characters of senior high school students. This research was conducted by using experimental quasi method. Research population were all students of Labschool Senior High School Jakarta. The samples were two classes taken from IX grade of Labschool Senior High School. One class was treated as the experimental class and the other as the control. The potentially developed characters of students taught by applying this learning type were creative, critical and logical thinking, thorough, honest, and courteous. It was concluded that there was an effect of learning model of Problem Posing, Pre-Solution Posing Type, on the outcome of Physics Learning. The class taught by applying learning model of Problem Posing, Pre-solution type, gained better mark of Physics subject
PENGARUH KONSENTRASI LARUTAN NaOH PADA KARBON AKTIF TEMPURUNG KELAPA UNTUK ADSORPSI LOGAM Cu2+ Wulandari, Futri; Umiatin, -; Budi, Esmar
Jurnal Spektra Vol 16, No 2 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Abstract

AbstrakPenelitian mengenai pembentukan karbon aktif berbahan dasar arang tempurung kelapa sebagai adsorben telah dilakukan. Tujuan penelitian ini adalah mengetahui pengaruh konsentrasi larutan NaOH dalam aktivasi kimia fisika untuk adsorpsi logam Cu2+. Arang tempurung kelapa hasil pirolisis digerus hingga mencapai ukuran granul milimeter kemudian dibersihkan dalam larutan alkohol 96% dan dipanaskan diatas hot plate selama 60 menit pada suhu ruang. Proses aktivasi kimia arang tempurung kelapa dilakukan dengan merendam arang tempurung kelapa dalam larutan NaOH pada variasi konsentrasi 1%, 2%, 4%, 7% selama 24 jam. Proses aktivasi fisika dilakukan dengan memanaskan arang hasil aktivasi kimia pada suhu 4000C selama 1 jam didalam tungku horizontal dan dialirkan gas Argon. Pada penelitian ini hasil uji AAS menunjukkan bahwa karbon aktif arang tempurung kelapa dapat diaplikasikan untuk mengadsorpsi logam Cu2+. Semakin tinggi konsentrasi larutan NaOH maka persentase logam Cu2+ teradsorpsi akan semakin menurun. Persentase logam Cu2+ teradsorpsi maksimum dihasilkan oleh karbon aktif dengan larutan NaOH 1% sebesar 80.87%. AbstractThe research on the formation of the activated carbon made from coconut shell charcoal as an adsorbent has been done. The purpose of this study was to determine the effect of the concentration of NaOH solution in the activation of chemistry physical for metal adsorption of Cu2+. Coconut shell charcoal pyrolysis results were crushed to size granules in millimeter then cleaned in a solution of 96% alcohol and heated on a hot plate for 60 minutes at room temperature. Chemical activation process of coconut shell charcoal is done by soaking the coconut shell charcoal in various concentration of NaOH solution at 1%, 2%, 4%, 7% for 24 hours. Physical activation process was done by heating the samples using horizontal furnace at temperature 4000C for 1 hours and Argon gas was flowed. In this study, the AAS test results indicate that activated carbon coconut shell charcoal can be applied to adsorb metals Cu2+. The higher the concentration of NaOH solution then the percentage of Cu2+ adsorbed metal will be decrease. The percentage of the maximum adsorbed Cu2+ metal was produced by activated carbon with  NaOH 1% solution at 80.87%. Keywords: activated carbon, coconut shell charcoal, chemical – physics activation, NaOH, Cu2+
DESAIN DAN PEMBUATAN ALAT UKUR GEOFISIKA BERBASIS SENSOR FLUXGATE DAN SENSOR MEDAN LISTRIK I Made Astra; Widyaningrum Indrasari; Umiatin Umiatin; Mitra Djamal
Jurnal Meteorologi dan Geofisika Vol 12, No 3 (2011)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v12i3.107

Abstract

Telah dilakukan pembuatan alat dengan menggunakan metoda "EM survei geofisika" dalam bentuk sensor fluxgate, sensor potensial listrik, dan unit injector flow. Elemen sensor "fluxgate" dibentuk dengan menggunakan kumparan sekunder ganda. konfigurasi elemen sensor "fluxgate" terdiri dari variasi lilitan primer 4 x 40 dan lilitan sekunder 2 x 60. Kumparan primer akan membangkitkan sebuah medan magnet internal yang berfungsi sebagai medan magnet acuan ketika kumparan sekunder digunakan untuk mengukur medan magnet eksternal (mendeteksi) sehingga sensitivitas sensor fluxgate ditentukan dengan bentuk kumparan sekunder. Berdasarkan analisa data, diperoleh sensitivitas sebesar 283.02 mV/mT dan dapat mendeteksi medan magnet hingga 3:53 nT. Sebuah sensor potensial listrik memiliki rentang pengukuran  yang diperoleh dari masukkan sensor sebesar 0-13 mV dan menghasilkan tegangan keluaran 0-5 volt. Ketika keluaran dari IGBT yang berfungsi sebagai saklar dan belum diatur menggunakan  unit antarmuka, dapat menghasilkan 50% siklus sinyal yang cukup baik, sehingga masih diperlukan perbaikan pada unit interface circuit flow transmitter. The research done supporting the manufacture of devices based on the method of EM geophysical survey in the form of fluxgate magnetic sensors, electric potential sensors, and interface unit injector flow. Fluxgate sensor element designed using a secondary coil (pick-up) double. The composition of fluxgate sensor element consists of two primary coils (excitation coil(4x40), two secondary coils (2x60). Primary coil will generate an internal magnetic field that serves as a reference magnetic field while the secondary coil serves to measure the external magnetic field (sensing) so that the sensitivity of fluxgate sensor is determined by the secondary coil design. Based on analysis of data obtained sensitivity 283.02 mV/mT, and can detect magnetic fields up to 3:53 nT. An electric potential sensor have a range of measurements obtained by sensor inputs 0-13 mV and produces a voltage output 0-5 volts. While the output of the IGBT which functions as a switch and have not be set using the interface unit can generate 50% duty cycle signal that is good enough, so it is still need for improvement in the unit interface circuit flow transmitter.
KARAKTERISASI SENSOR HALL EFFECT SEBAGAI SENSOR MAGNETIK PADA PROTOTIPE PENJELAJAH PENGUKUR MEDAN MAGNET DENGAN SISTEM KENDALI ANDROID Nadya Hidayatie; Widyaningrum Indrasari; Umiatin Umiatin
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (469.528 KB) | DOI: 10.21009/03.SNF2017.02.CIP.06

Abstract

The prototype explorer is a device that can work measuring the magnetic field of the magnetic material that spread at desired location. The main component of the prototype is the Hall Effect UGN3503 magnetic sensor. Characterization of magnetic sensor has been performed by using coil calibration and Gaussmeter type IDR-325. From the characterization known the result that the value of sensitivity the sensor equal to 595 G/V with relative error 2,55 %. The sensor can work effectively to detect a weak magnetic field of 0,1068 G at a distance of 5 cm. Keywords: Hall Effect, Robot Explorer, Android Application
PENGEMBANGAN MINIATUR PEMBANGKIT LISTRIK TENAGA AIR SEBAGAI MEDIA PEMBELAJARAN FISIKA SEKOLAH MENENGAH ATAS (SMA) Hayatining Suci Abdilah; Desnita Desnita; Umiatin Umiatin
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Penelitian ini bertujuan untuk menghasilkan produk pengembangan berupa miniatur pembangkit listrik tenaga air yang dapat digunakan oleh guru dan siswa dalam proses pembelajaran fisika untuk meningkatkan pengetahuan dan kemapuan berpikir ilmiah siswa dalam pembelajaran fisika pada materi perubahan energi kelas XI SMA. Penelitian dilakukan pada bulan Oktober 2014 – Mei 2015 di SMAI Al- Azhar Kelapa Gading. Penelitian ini menggunakan metode penelitian pengembangan (research and development). Penelitian dilakukan melalui beberapa tahapan yaitu (1) mengkaji kompetensi dasar kurikulum 2013, inventarisasi permasalahan guru dalam menyampaikan konsep perubahan energi, dan menginventarisasi ketersediaan alat peraga di sekolah. (2) desain produk. (3) revisi desain. (4) pembuatan produk. (5) validasi produk oleh ahli (dosen), guru dan siswa. (6) revisi produk. (7) uji pemakaian (studi implementasi). Hasil uji coba miniatur pembangkit listrik tenaga air diharapkan dapat menunjukkan bahwa miniatur pembangkit listrik tenaga air merupakan media pembelajaran sebagai alat praktikum yang dapat membantu guru dalam menyampaikan materi serta dapat mengembangkan keterampilan proses sains, hasil ini dapat diperoleh setelah dilakukan validasi dan uji implementasi. Keywords: alat peraga, miniature, pembangkit listrik tenaga air, research and development, perubahan energi.
PENGARUH KONSENTRASI LARUTAN KOH PADA KARBON AKTIF TEMPURUNG KELAPA UNTUK ADSORPSI LOGAM Cu Erlina Erlina; Umiatin Umiatin; Esmar Budi
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

The research on the manufacture of activated carbon made from coconut shell charcoal by using chemical and physical activation has been done. Chemical activation was done by soaking the granulated charcoal into the activator solution of Potassium Hydroxide (KOH). And physical activation was done by passing argon gas into the furnace. The purpose of this research was to determine the effect of variations concentration of the activator solution to the adsorption power of activated carbon for removed heavy metal Cu. Chemical activation was done by soaking the samples for 24 hours in a solution of KOH 30%, 40%, 50% and 60%. While the physical activation was done by using a horizontal furnace at a temperature of 400oC for 1 hour with argon gas flow rate of 200 kg/m3. Samples that have been activated were tested for their ability to adsorb Cu in solution Copper Sulfate. Filtration process used is a batch method, in which the samples were stored in waste and stirred using a magnetic stirrer. The results of analysis by Atomic Absorption Spectrophotometer (AAS) showed the highest adsorption efficiency by 50% KOH activation of 83.57%. And the results of tests that have been performed, the greater the concentration of KOH were given the higher efficiency of adsorption of the Cu metal. But for 60% KOH concentration adsorption efficiency decreases due to pore activated carbon saturated so that the adsorption power decreases. Key words: activated carbon, Potassium Hydroxide, Adsorption, heavy metal.
PENGARUH TEMPERATUR PENGERINGAN PADA AKTIVASI ARANG TEMPURUNG KELAPA DENGAN ASAM KLORIDA DAN ASAM FOSFAT UNTUK PENYARINGAN AIR KERUH Futri Wulandari; Erlina Erlina; Ridho Akbar Bintoro; Esmar Budi; Umiatin Umiatin; Hadi Nasbey
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 3 (2014): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2014
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Telah dilakukan penelitian mengenai pembentukan arang aktif berbahan arang tempurung kelapa sebagai adsorben. Tujuan penelitian ini adalah mengetahui pengaruh temperatur pengeringan pada aktivasi arang tempurung kelapa dengan asam klorida dan asam fosfat untuk penyaringan air keruh yaitu air tanah. Dalam penelitian ini, arang tempurung kelapa hasil pirolisis di gerus hingga mencapai ukuran granul mikrometer kemudian dibersihkan dalam larutan alkohol 96% dan dipanaskan diatas hot plate selama 30 menit pada suhu ruang. Proses aktivasi arang tempurung kelapa dilakukan dengan merendam arang tempurung kelapa dalam asam klorida dan asam fosfat selama 24 jam. Kemudian campuran tersebut disaring dan dicuci dengan aquades lalu dikeringkan dalam oven dengan variasi temperatur 100 0C dan 150 0C selama 2 jam, setelah itu didinginkan dalam desikator. Semakin tinggi temperatur pengeringan maka semakin sedikit kadar air yang terkandung dalam arang aktif sehingga dapat menghasilkan pori yang semakin besar maka arang aktif yang dihasilkan akan semakin baik. Arang aktif yang mempunyai karakteristik terbaik adalah arang tempurung kelapa yang diaktivasi dengan asam fosfat dengan kadar air 5.699% pada temperatur 1000C dan 5.322% pada temperatur 1500C. Keywords: activated carbon, coconut shell charcoal, sulfuric acid, phosphoric acid.
KARAKTERISASI SENSOR MAGNETIK FLUXGATE KUMPARAN SEKUNDER GANDA MENGGUNAKAN ELEMEN SENSOR MULTICORE Widyaningrum Indrasari; Mitra Djamal; Umiatin Umiatin
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Fluxgate is a magnetic sensor that capable to measure the magnetic field in a very small order. The basic principle of the fluxgate sensor is by comparing the measured magnetic field with the magnetic field reference. In this paper, we describe the characterization of fluxgate magnetic sensor using the double secondary coil design. Configuration of primary coil winding and secondary coil that be used is 4x40 and 2x60. We use vitrovacs 6025Z (1.5 mm width and 0.025 mm thick) as the sensor core. Sensor characterization with varying amounts of the core layer is made to determine the influence of the core layer to the demagnetization factor and the sensor sensitivity. The demagnetization factor is performed by measuring the dimensions of the sensor element and the inductance of the sensor. The inductance of the sensor is measured using a LCR meter GW Instek 829 series at a frequency of 10 kHz. The calculation results show that the increasing amounts of the vitrovac core layer is proportional to the demagnetization factor. To determine the sensor sensitivity, sensor calibration is performed by giving the external field on the calibration coil in a faraday chamber. From the sensor calibration we get the relationship between the external fields with the sensor output voltage. Based on this relationship, we can calculate the sensor sensitivity in working range ± 4 μT. Sensor sensitivity is inversely proportional to the amounts of vitrovac core layer. Sensor with 2 vitrovac core layers has the highest sensitivity (641 mV / μT), and has the smallest absolute error (0.1 at the point of 3.87 μT). Keywords: fluxgate, external field, vitrovac, sensitivity, demagnetization factor, inductance.
PENGEMBANGAN ALAT UKUR VISKOSITAS AIR SUNGAI TERCEMAR LIMBAH CAIR BERBASIS SENSOR OPTIK TIPE THROUGH BEAM Leni Andayani; Widyaningrum Indrasari; Umiatin Umiatin
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 8 (2019): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2019
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (237.724 KB) | DOI: 10.21009/03.SNF2019.02.PA.04

Abstract

Dewasa ini ketersediaan air bersih semakin menurun, tidak sebanding dengan kebutuhan air bersih yang kian meningkat. Banyaknya penduduk dan peningkatan industri mengakibatkan produksi limbah cair semakin banyak. Kualitas air yang baik ditentukan berdasarkan beberapa parameter fisis antara lain suhu, kekeruhan, warna, daya hantar listrik, jumlah zat padat terlarut, salinitas, indeks bias, tegangan permukaan, pH dan viskositas. Viskositas merupakan indikator yang penting dalam menentukan kualitas air tercemar, namun alat ukur viskositas sangat terbatas. Oleh karena itu diperlukan pembuatan alat ukur viskositas yang efektif, efisien dan presisi. Pada penelitian ini telah dikembangkan alat ukur viskositas zat cair yang memanfaatkan sensor optik tipe through beam berbasis Arduino Uno R3. Dari hasil karakterisasi sensor viskositas menggunakan viskometer Ostwald diperoleh sensitivitas sensor sebesar 17.31 mV/cP dengan kesalahan relatif maksimum 4.605%. Hasil pengukuran sampel air sungai ( Banjir Kanal Timur (BKT), Bekasi, Cipinang dan Galur ) diperoleh nilai viskositas berturut-turut 1.246 cP, 1.268 cP, 1.248 cP dan 1.546 cP. Hasil pengukuran sampel air sungai menunjukkan bahwa nilai viskositas air sungai tersebut melebihi batas normal air bersih yaitu 1.002 cP pada suhu 200C, sehingga air sungai di atas dapat dikatakan tercemar. Today, the availability of clean water is decreasing, not worth the need for a growing water. Many population and industry improvement resulted in more liquid waste production. Good water quality is determined based on several parameters phisycs among others temperature, turbidity, color, electrical power, the amount of dissolved solids, salinity, refractive index, surface tension, pH and viscosity. Viscosity is an important indicator in determining the quality of polluted water, but the viscosity measuring instrument is very limited. It is therefore necessary to manufacture effective, efficient and precise viscosity measuring instruments. In this study, a liquid measuring instrument has been developed that utilizes the Arduino Uno R3-based through beam type optical sensor. From the results of characterization of viscosity sensors using the Ostwald viscometer obtained sensor sensitivity of 17.31 mV/cP with a maximum relative error of 4,605%. The results of river water sampling (East Canal Flood (BKT), Bekasi, Cipinang and Galur) were obtained in successive viscosity values of 1,246 cP, 1,268 cP, 1,248 cP and 1,546 cP. The results of the river water sample measurement showed that the viscosity of the river water value exceeded the normal clean water limit of 1,002 cP at 200C, so the river water above can be said to be polluted.
PENGUKURAN SALINITAS AIR SUNGAI TERCEMAR LIMBAH CAIR MENGGUNAKAN SENSOR KONDUKTIVITAS Novita Fitriani; Widyaningrum Indrasari; Umiatin Umiatin
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 8 (2019): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2019
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (276.345 KB) | DOI: 10.21009/03.SNF2019.02.PA.10

Abstract

Seiring dengan pertambahan penduduk dan pembangunan ekonomi, jenis dan kuantitas limbah cair semakin besar. Di lain pihak kebutuhan air bersih juga semakin meningkat. Hal ini tidak diimbangi dengan kondisi kualitas air yang semakin menurun. Salah satu syarat air yang dapat dimanfaatkan untuk kebutuhan air bersih adalah air yang memiliki nilai salinitas ≤0.5 ppt. Salinitas menggambarkan kadar garam yang terlarut dalam air. Pada penelitian ini dirancang pengukuran salinitas air tercemar limbah cair menggunakan sensor konduktivitas dan Arduino UNO sebagai sistem kontrol. Penelitian ini bertujuan untuk mengetahui apakah air sungai yang diuji layak dijadikan sumber air bersih berdasarkan parameter salinitas. Hasil karakterisasi sensor menunjukkan sensitivitas sensor sebesar 0.4152 mV/ppt dengan kesalahan relatif maksimum sebesar 5.26%. Pada pengujian salinitas air sungai, diambil sampel yang berasal dari wilayah Cipinang, Banjir Kanal Timur (BKT), Galur, dan Bekasi. Berdasarkan hasil pengujian salinitas, sampel air sungai yang diambil dari keempat wilayah yang berbeda memenuhi syarat salinitas air bersih yaitu ≤0.5 ppt sehingga layak dijadikan sumber air bersih. Along with population growth and economic development, the type and quantity of liquid waste is getting bigger. On the other hand, the need for clean water is also increasing. This is not balanced with the condition of declining water quality. One of the requirements for water that can be used for clean water needs is water that has a salinity value of ≤0.5 ppt. Salinity describes the salt content dissolved in water. In this study, the measurement of salinity of polluted water using a conductivity sensor and Arduino UNO as a control system was designed. This study aims to determine whether river water tested is suitable as a source of clean water based on salinity parameters. The sensor characterization results showed sensor sensitivity of 0.4152 mV / ppt with a maximum relative error of 5.26%. In testing the river water salinity, samples were taken from the Cipinang area, Banjir Kanal Timur (BKT), Galur, and Bekasi. Based on the results of salinity testing, river water samples taken from the four different regions meet the salinity requirements of clean water, namely ≤0.5 ppt so that they are suitable as a source of clean water.
Co-Authors Desnita Desnita Erlina Erlina Erlina Erlina Esmar Budi Esmar Budi Esmar Budi Febrian Zulmi Fitri Sakinah Futri Wulandari Futri Wulandari, Futri Hadi Nasbey Hayatining Suci Abdilah I Made Astra I. M. Astra Leni Andayani M. Jannah Michael Setiyanto Silambi Mitra Djamal Mitra Djamal Mutiara Pratama Nadya Hidayatie Novita Fitriani Ridho Akbar Bintoro Shallu Fidhah Ariyanti Taryudi Taryudi Widyaningrum Indrasari Yolanda Natasya Mega Stella