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PROGRAM DERIVE BAGI GURU MATEMATIKA SMA DAN SMK KOTA MALANG Widjajanti, Kristina; Hartono, Mohammad; Pudjowati, Utami Retno
Prosiding Seminar Nasional MIPA 2016: PROSIDING SEMINAR NASIONAL MIPA UNDIKSHA 2016
Publisher : Prosiding Seminar Nasional MIPA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Banyak siswa kesulitan dalam penyelesaian matematika. Guru harus memberikan pelbagai metode mengajar yang menarik dan tidak membosankan. Salah satu alternatif metode adalah pembelajaran matematika berbasis komputer. Permasalahannya adalah semua sekolah menengah di Malang tidak mempunyai software untuk penyelesaian matematika. Oleh karena itu guru membutuhkan pelatihan pembelajaran berbasis komputer. Program Derive adalah salah software yang dapat membantu menyelesaikan permasalahan matematika. Inti kegiatan Iptek bagi Masyarakat (IbM) ini adalah 2 guru matematika SMAN 9 dan 2 guru SMKN 2 mengikuti ToT, serta 16 guru matematika dari pelbagai SMA dan SMK Kota Malang mengikuti pelatihan Program Derive. Hasil kegiatan diperoleh semua peserta sependapat Program Derive sangat menarik dan bermanfaat. Peserta akan mengiinformasikan pada kelompok guru matematika (MGMP) dan mengenalkan Derive pada siswanya. Kata-kata Kunci: metode, pembelajaran, program derive Abstract Many students have difficulty in Mathematics problem. The teachers must give them various teaching methods. One alternative method is Math learning with the computer-based. The problem was all Senior High School in Malang didn’t have the software of Math. The teachers need training of computer-based learning of Math. The derive program is one software to solve the Math problems. Main activity of community service (IbM) are Training of Trainer (ToT) and workshop for the teacher. There are two partners of IbM, such as SMAN 9 and SMKN 2. The sum of ToT is four teachers and sixteen teachers for workshop. The results of activity are all participants like derive program, very interested, easy, and very useful, especially for key-answer. The participants want to tell about derive program to group of math teachers (MGMPs) and introduce derive for the students. Keywords : methods , learning , derive program
SCAFFOLDING DAN DAMPAKNYA: STUDI KASUS PADA PEMBELAJARAN MATERI KUBUS Kristina Widjajanti
SENTIA 2016 Vol 8, No 2 (2016)
Publisher : SENTIA 2016

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (788.572 KB)

Abstract

Kemampuan guru dalam mengajar sangat penting, di antaranya adalah kemampuan terhadap penguasaan materi pelajaran dan bagaimana membelajarkan siswa. Tujuan penelitian adalah mengidentifikasi scaffolding yang digunakan guru berdasarkan kategori scaffolding dari Roehler & Cantlon dan dampak scaffolding guru terhadap pemahaman siswa terkait konsep kubus. Penelitian dilakukan di kelas V pada salah satu Sekolah Dasar Swasta kota Malang. Hasil pengamatan identifikasi jenis scaffolding yang digunakan guru dalam pembelajaran materi kubus adalah: pemodelan tingkah laku, menawarkan penjelasan, mengundang siswa untuk berpartisipasi, mengundang siswa untuk berkontribusi memberikan petunjuk, serta memverifikasi dan menglarifikasi pemahaman siswa. Terdapat dua dampak scaffolding yaitu scaffolding yang menguatkan konsep yang disebut scaffolding produktif (productive scaffolding) dan scaffolding yang berdampak mengaburkan konsep yang disebut scaffolding kontra produktif (counterproductive scaffolding). Scaffolding yang berdampak menguatkan konsep mempunyai makna bahwa bantuan yang diberikan guru membantu siswa dalam memahami konsep yang berkaitan dengan kubus. Scaffolding yang berdampak mengaburkan konsep adalah scaffolding yang berakibat menjauhkan pemahaman siswa dari konsep yang berkaitan dengan kubus.
SCHEMATIC REPRESENTATION: HOW STUDENTS CREATING IT? Anwar, Rahmad Bustanul; Rahmawati, Dwi; Widjajanti, Kristina
MATEMATIKA DAN PEMBELAJARAN Vol 7, No 1 (2019): MATEMATIKA DAN PEMBELAJARAN
Publisher : IAIN Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33477/mp.v7i1.825

Abstract

Penelitian ini bertujuan untuk mendeskripsikan proses terbentuknya representasi skematis murni dan representasi skematis campuran yang diciptakan oleh siswa selama menyelesaikan word problem. Jenis penelitian yang digunakan adalah kualitatif yang bersifat deskriprif. Dalam penelitian ini melibatkan 45 siswa kelas 8. Sedangkan untuk memilih subjek tidak dipilih secara acak, namun dipilih berdasarkan kemampuan siswa dalam menciptkan representasi skematik. Pengumpulan data dilakukan dengan meminta siswa untuk menyelesaikan Tugas Pemecahan Masalah secara think aload, yaitu siswa diminta untuk menyuarakan apa yang dipikirkannya. Selain itu siswa juga menuangkan pikirannya mengunakan kertas dan pensil. Hasil penelitian ini menunjukkan bahwa proses representasi skematis murni diciptakan siswa dengan membuat gambar skema berupa garis besar dari masalah dan dilengkapi dengan beberapa keterangan pokok yang ada dalam masalah. Sedangkan proses representasi skematis campuran diciptakan siswa dengan membuat gambar skema yang dilengkapi dengan keterangan-keterangan dan gambar nyata yang sesuai dengan situasi dalam masalah. Kedua jenis representasi skematis ini sangat efektif dalam membantu siswa dalam menyelesaikan word problem. Kata kunci: representasi skematis, representasi skematis murni, representasi skematis campuran. This study aims to describe the process of formation of pure schematic representation and mixed schematic representation created by students during solving word problem. The type of research used is descriptive qualitative. In this study involving 45 students 8th grade. While to select the subject not selected at random, but selected based on the ability of students in creating schematic representation. The data collection is done by asking the students to solve the Problem-solving Tasks of think a load, ie the students are asked to voice what they think. In addition students also pour their minds using paper and pencil. The results of this study indicate that the process of pure schematic representation is created by creating schematic drawings in the form of an outline of the problem and supplemented with some basic information that exists in the problem. While the process of mixed schematic representation was created by the students by drawing schematic drawings with explanations and real images that fit the situation in the problem. Both types of schematic representation is very effective in assisting students in solving word problem. Keywords: representation, schematic representation, pure schematic, mixed schematic.
PELATIHAN KOMPUTER PROGRAM MICROSOFT EXCEL KEPADA PENGURUS JPZISNU RANTING SEDAYU KECAMATAN TUREN KABUPATEN MALANG Kristina Widjajanti; Aad H.; Ahmad W. Purwandi; Hudiono; Ridho H.Y.P.; Divac N.A.
Jurnal Pengabdian Polinema Kepada Masyarakat Vol. 8 No. 2 (2021): Jurnal Pengabdian Polinema Kepada Masyarakat
Publisher : UPT Penelitian dan Pengabdian Kepada Masyarakat Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jppkm.v8i2.85

Abstract

JPZISNU (Jaringan Pengumpul Zakat, Infaq, da Shadaqah Nahdlatul Ulama) di ranting Sedayu, Kecamatan Turen Kabupaten Malang, merupakan suatu organisasi di bawah pengawasan BAZNAS (Badan Amil Zakat Nasional) berperan sebagai pengumpul zakat masyarakat di tingkat ranting (desa/kelurahan). Sifat keanggotaan JPZISNU adalah secara sukarela. JPZISNU memiliki kewajiban utama melaporkan data keuangan yang dikelola, kegiatan yang dilakukan, serta ianah syariah lainnya. Dengan demikian, penggunaan program berbantuan komputer, khususnya Microsoft Excel, akan sangat membantu dalam penyusunan laporan ke badan pusat. Pada kenyataannya, pengurus JPZISNU Ranting Sedayu saat ini hanya terbatas dua orang yang mampu mengoperasikan Microsoft Excel untuk menyusun laporan keuangan. Didasari kenyataan itulah maka gagasan untuk melaksanakan kegiatan PKM (Pengabdian Kepada Masyarakat) berupa Pelatihan Program Komputer Microsoft Excel diberikan kepada pengurus JPZISNU. Tujuan PKM ini adalah memperkenalkan dan memberikan pelatihan komputer program Microsoft Excel kepada pengurus JPZISNU ranting Sedayu. Dengan dilakukannya pelatihan Microsoft Excel, sangat membantu Pengurus JPZISNU dalam mengelola pencatatan keluar masuknya uang zakat, infaq, dan shadaqah dalam organisasi serta dapat membantu memudahkan penyusunan laporan pertanggungjawaban organisasi ke BAZNAS pusat.
Ekstrak Kafein sebagai Inhibitor Korosi Alami pada Logam Aluminium dalam Media Larutan Asam Sulfat dan Biosolar Marinda Sukmawanta, Shafara Najla; Wulan, Dyah Ratna; Widjajanti, Kristina; Azkiya, Noor Isnaini; Maryanty, Yanty
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.488

Abstract

This research, the caffeine extract of arabica coffee beans, cacao beans, and black tea leaves will be tested as a corrosion inhibitor on aluminium in an acidic environment and in biodiesel containing acid. This condition resembles the metabolism of microorganisms in biodiesel which produces H2SO4 as one of the causes of corrosion. Arabica coffee, cacao beans and black tea are natural organic ingredients containing caffeine which can inhibit corrosion. In the maceration process used a variable ratio of 70% ethanol solvent with organic matter, namely 225 grams of organic matter with 450 grams of ethanol and 150 grams of organic matter with 450 grams of ethanol. Concentration of caffeine extract from arabika coffee, cacao beans, and black tea leaves was obtained based on HPLC analysis at an effluent rate of 0.8 mL/min. The corrosion inhibition efficiency test on aluminium was observed at 0, 1, 4, 7 and 10 days of immersion. The previously used aluminium has been corroded with 12% H2SO4. The corrosion inhibition efficiency test on aluminium was observed at 0, 1, 4, 7 and 10 days of immersion. The best inhibitor results on aluminium soaked in biosolar containing 12% H2SO4 is tea 1.234,313 ppm with a corrosion rate of 1.6x10-4 g/cm2 day on day 1 to 2.5x10-4 g/ cm2 day on day 10 with an inhibition efficiency of 99%. While the aluminium soaked in H2SO4 12% is tea containing caffeine of 684.373 ppm with a corrosion rate of 1.3 x10-4 g/ cm2 day on day 1 to 3.3x10-4 g/ cm2 day on day 10 with an inhibition efficiency of 64%. The longer the immersion time of aluminium in H2SO4 media with the addition of organic inhibitors, the lower the corrosion rate value because the inhibitors form a layer that protects the aluminium.
Ekstrak Kafein sebagai Inhibitor Korosi Alami pada Logam Aluminium dalam Media Larutan Asam Sulfat dan Biosolar Shafara Najla Marinda Sukmawanta; Dyah Ratna Wulan; Kristina Widjajanti; Noor Isnaini Azkiya; Yanty Maryanty
Jurnal Riset Kimia Vol. 13 No. 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.488

Abstract

This research, the caffeine extract of arabica coffee beans, cacao beans, and black tea leaves will be tested as a corrosion inhibitor on aluminium in an acidic environment and in biodiesel containing acid. This condition resembles the metabolism of microorganisms in biodiesel which produces H2SO4 as one of the causes of corrosion. Arabica coffee, cacao beans and black tea are natural organic ingredients containing caffeine which can inhibit corrosion. In the maceration process used a variable ratio of 70% ethanol solvent with organic matter, namely 225 grams of organic matter with 450 grams of ethanol and 150 grams of organic matter with 450 grams of ethanol. Concentration of caffeine extract from arabika coffee, cacao beans, and black tea leaves was obtained based on HPLC analysis at an effluent rate of 0.8 mL/min. The corrosion inhibition efficiency test on aluminium was observed at 0, 1, 4, 7 and 10 days of immersion. The previously used aluminium has been corroded with 12% H2SO4. The corrosion inhibition efficiency test on aluminium was observed at 0, 1, 4, 7 and 10 days of immersion. The best inhibitor results on aluminium soaked in biosolar containing 12% H2SO4 is tea 1.234,313 ppm with a corrosion rate of 1.6x10-4 g/cm2 day on day 1 to 2.5x10-4 g/ cm2 day on day 10 with an inhibition efficiency of 99%. While the aluminium soaked in H2SO4 12% is tea containing caffeine of 684.373 ppm with a corrosion rate of 1.3 x10-4 g/ cm2 day on day 1 to 3.3x10-4 g/ cm2 day on day 10 with an inhibition efficiency of 64%. The longer the immersion time of aluminium in H2SO4 media with the addition of organic inhibitors, the lower the corrosion rate value because the inhibitors form a layer that protects the aluminium.
PROGRAM DERIVE BAGI GURU MATEMATIKA SMA DAN SMK KOTA MALANG Kristina Widjajanti; Mohammad Hartono; Utami Retno Pudjowati
Prosiding Seminar Nasional MIPA 2016: PROSIDING SEMINAR NASIONAL MIPA UNDIKSHA 2016
Publisher : Prosiding Seminar Nasional MIPA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Banyak siswa kesulitan dalam penyelesaian matematika. Guru harus memberikan pelbagai metode mengajar yang menarik dan tidak membosankan. Salah satu alternatif metode adalah pembelajaran matematika berbasis komputer. Permasalahannya adalah semua sekolah menengah di Malang tidak mempunyai software untuk penyelesaian matematika. Oleh karena itu guru membutuhkan pelatihan pembelajaran berbasis komputer. Program Derive adalah salah software yang dapat membantu menyelesaikan permasalahan matematika. Inti kegiatan Iptek bagi Masyarakat (IbM) ini adalah 2 guru matematika SMAN 9 dan 2 guru SMKN 2 mengikuti ToT, serta 16 guru matematika dari pelbagai SMA dan SMK Kota Malang mengikuti pelatihan Program Derive. Hasil kegiatan diperoleh semua peserta sependapat Program Derive sangat menarik dan bermanfaat. Peserta akan mengiinformasikan pada kelompok guru matematika (MGMP) dan mengenalkan Derive pada siswanya. Kata-kata Kunci: metode, pembelajaran, program derive Abstract Many students have difficulty in Mathematics problem. The teachers must give them various teaching methods. One alternative method is Math learning with the computer-based. The problem was all Senior High School in Malang didn’t have the software of Math. The teachers need training of computer-based learning of Math. The derive program is one software to solve the Math problems. Main activity of community service (IbM) are Training of Trainer (ToT) and workshop for the teacher. There are two partners of IbM, such as SMAN 9 and SMKN 2. The sum of ToT is four teachers and sixteen teachers for workshop. The results of activity are all participants like derive program, very interested, easy, and very useful, especially for key-answer. The participants want to tell about derive program to group of math teachers (MGMPs) and introduce derive for the students. Keywords : methods , learning , derive program
Asam Askorbat, Natrium Nitrit dan Natrium Fosfat sebagai Inhibitor Laju Korosi pada Alumunium dan Seng dalam Media Biosolar Dyah Ratna Wulan; Noor Isnaini Azkiya; Kristina Widjajanti; Nadua Bella Wardani; Yanty Maryanty
Jurnal Teknik Kimia dan Lingkungan Vol 6, No 1 (2022): April 2022
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v6i1.245

Abstract

Korosi merupakan penurunan mutu logam akibat adanya reaksi elektrokimia dengan lingkungannya, sedangkan bio-korosi merupakan suatu peristiwa korosi yang dipengaruhi oleh mikroorganisme terutama dari kelompok Sulfat Reducing Bacteria (SRB). SRB mengakibatkan terjadinya korosi logam pada tangki penyimpanan biosolar. Laju korosi dapat diturunkan dengan cara penambahan inhibitor organik maupun anorganik ke dalam suatu media korosi. Tujuan penelitian ini adalah mempelajari pengaruh inhibitor organik berupa asam askorbat, dan inhibitor anorganik berupa natrium nitrit dan natrium fosfat terhadap terhadap laju korosi dan efisiensi inhibitor pada logam alumunium (Al) dan seng (Zn) yang direndam dalam media biosolar dalam kondisi pH asam. Pengaruh ketiga jenis inhibitor yang masing-masing memiliki konsentrasi sebesar 25, 50, dan 75 ppm terhadap logam yang direndam dengan biosolar diinvestigasi menggunakan teknik penurunan berat logam. Pengukuran berat logam yang direndam dalam inhibitor dan media biosolar dilakukan pada variasi waktu 0, 1, 4, 7, dan 10 hari kemudian dilakukan analisa laju korosi dan efisiensi inhibisi. Masing-masing inhibitor dapat mengghambat laju korosi logam dengan efisiensi inhibisi tertinggi yaitu asam askorbat. Inhibitor terbaik dalam media biosolar yaitu asam askorbat 75 ppm yang dikontakkan dengan logam selama 10 hari dengan nilai efisiensi inhibitor asam askorbat terhadap logam alumunium sebesar 26,92 % dan seng sebesar 70,90 %.Corrosion is a decrease in metal quality due to an electrochemical reaction with its environment while bio-corrosion is a corrosion event that is influenced by microorganisms, especially from the Sulfate Reducing Bacteria (SRB) group. This group of bacteria generally causes metal corrosion in biodiesel storage tanks. The corrosion rate can be reduced by adding organic or inorganic inhibitors. The purpose of this study was to study the effect of organic inhibitor such as ascorbic acid, and inorganic inhibitors such as sodium nitrite and sodium phosphate on the corrosion rate and inhibitor efficiency of aluminum and zinc metals immersed in biodiesel media under acidic pH conditions. The effect of the three types of inhibitors which each concentrations of 25, 50, and 75 ppm on metals immersed in biodiesel was investigated using weight loss techniques. The measurement of the weight of the metal immersed in the inhibitor and biodiesel media was carried out at various times of 0, 1, 4, 7, and 10 days and then calculated the corrosion rate and inhibition efficiency. The best inhibitor in biodiesel media is 75 ppm ascorbic acid which is in contact with metal for 10 days with has an efficiency value of ascorbic acid inhibitor against aluminum metal of 26,92 % and zinc of 70,90 %.
Schematic Representation: How Students Creating It? Rahmad Bustanul Anwar; Dwi Rahmawati; Kristina Widjajanti
MATEMATIKA DAN PEMBELAJARAN Vol 7, No 1 (2019): MATEMATIKA DAN PEMBELAJARAN
Publisher : IAIN Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1400.015 KB) | DOI: 10.33477/mp.v7i1.1042

Abstract

Abstrak Penelitian ini bertujuan untuk mendeskripsikan proses terbentuknya representasi skematis murni dan representasi skematis campuran yang diciptakan oleh siswa selama menyelesaikan word problem. Jenis penelitian yang digunakan adalah kualitatif yang bersifat deskriprif. Dalam penelitian ini melibatkan 45 siswa kelas 8. Sedangkan untuk memilih subjek tidak dipilih secara acak, namun dipilih berdasarkan kemampuan siswa dalam menciptkan representasi skematik. Pengumpulan data dilakukan dengan meminta siswa untuk menyelesaikan Tugas Pemecahan Masalah secara think aload, yaitu siswa diminta untuk menyuarakan apa yang dipikirkannya. Selain itu siswa juga menuangkan pikirannya mengunakan kertas dan pensil. Hasil penelitian ini menunjukkan bahwa proses representasi skematis murni diciptakan siswa dengan membuat gambar skema berupa garis besar dari masalah dan dilengkapi dengan beberapa keterangan pokok yang ada dalam masalah. Sedangkan proses representasi skematis campuran diciptakan siswa dengan membuat gambar skema yang dilengkapi dengan keterangan-keterangan dan gambar nyata yang sesuai dengan situasi dalam masalah. Kedua jenis representasi skematis ini sangat efektif dalam membantu siswa dalam menyelesaikan word problem. Abstract This study aims to describe the process of formation of pure schematic representation and mixed schematic representation created by students during solving word problem. The type of research used is descriptive qualitative. In this study involving 45 students 8th grade. While to select the subject not selected at random, but selected based on the ability of students in creating schematic representation. The data collection is done by asking the students to solve the Problem-solving Tasks of think a load, ie the students are asked to voice what they think. In addition students also pour their minds using paper and pencil. The results of this study indicate that the process of pure schematic representation is created by creating schematic drawings in the form of an outline of the problem and supplemented with some basic information that exists in the problem. While the process of mixed schematic representation was created by the students by drawing schematic drawings with explanations and real images that fit the situation in the problem. Both types of schematic representation is very effective in assisting students in solving word problem.
PERSEPSI ANAK USIA DINI TERHADAP BENTUK MAKANAN UNIK Farida Arinie Soelistianto; Martono Dwi Atmadja; Kristina Widjajanti; Yani Ratnawati; Azam Muzakhim Imammuddin
Jurnal Pengabdian Polinema Kepada Masyarakat Vol. 8 No. 1 (2021): Jurnal Pengabdian Polinema Kepada Masyarakat
Publisher : UPT Penelitian dan Pengabdian Kepada Masyarakat Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jppkm.v8i1.65

Abstract

Nutrient content and efficacy of the oyster mushroom has a high protein with a complete amino acids, including essential amino acids needed manusia.Selain itutuna oyster contains vitamins B1, B2 and some mineral salts of the elements Ca, P, Fe, Na and K . The fiber content of 7.4% until the mushrooms start of 27.6% is very good for digestion. While the meatballs are generally the typical food of the city of Malang are usually made from raw material although recent beef can also be made from raw materials of fish, chicken and mushroom. Apart easily cultivated oyster mushrooms also are cheap and plentiful and can be purchased at any place. Communities with lower economic levels can utilize adequate nutrition by consuming the mushrooms. Making meatballs from the basic ingredients of oyster mushrooms are also very easy to manufacture so diharapkakn could be an alternative to improve nutrition can also be developed to increase revenues when produced as meatballs mushrooms. Pre-test results showed that before the training participants still do not understand about the material with a mean value of 1.92. After carrying out training post test mean value becomes 3.75 This means participants' understanding of the material provided increased 98.5135%. This shows that the community service activities managed to improve the knowledge and skills of participants in the process recipe meatballs made from fresh oyster mushrooms.