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All Journal Humanika : Kajian Ilmiah Mata Kuliah Umum Jurnal Sains Dasar AKSIOLOGIYA : Jurnal Pengabdian Kepada Masyarakat Jurnal Fisika : Fisika Sains dan Aplikasinya Indonesian Review of Physics (IRiP)
Elisabeth Pratidhina
Universitas Katolik Widya Mandala Surabaya
Arts Humanities Astronomy Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology Physics Social Sciences

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Kajian efek Mpemba pada pendinginan air keran yang awalnya dipanaskan secara infinitesimal Founda Noviani, Elisabeth Pratidhina; Setiawan, Arif; Dwandaru, Wipsar Sunu Brams
Jurnal Sains Dasar Vol 2, No 2 (2013): October 2013
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v2i2.3291

Abstract

Abstract   The purpose of this research is to know whether in the cooling process of tap water that is initially heated infinitesimally follow the Mpemba effect or not. The sample that is used in this research is tap water from a uniform source. The control variables are freezer temperature, the content of water, volume of water, and type of water. Two variations are done on the sample, i.e. the water is initially heated infinitesimally and the water is not heated. Both samples are cooled together in a freezer. For some period of time their temperature is measured. The experiment is repeated nine times. Based on the analysis, water that is initially heated infinitesimally takes shorter time to reach zero centigrade than water that is initially unheated. The cooling graph of water that is initially heated infinitesimally intersects the cooling graph of water that is initially unheated. The intersection lies between 5.5oC until 26.5o C. From all parameters that are obtained from the data analysis, it can be concluded that the Mpemba effect occurs consistently in the cooling process of tap water that is initially heated infinitesimally.   Key words: Mpemba effect, freezing, tap water, infinitesimal heating, cooling, time
Carbon Dots Synthesized from Tofu Pulp for Liquid Tofu Waste Photo-degradation Nurohman, Yosi; Pratidhina, Elisabeth; Sari, Emi Kurnia; Dwandaru, Wipsar Sunu Brams
Indonesian Review of Physics (IRiP) Vol 4, No 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3327

Abstract

This study was aimed to prepare and characterize carbon dots (CDs) from tofu pulp for liquid tofu wastes photo-degradation. The tofu pulp was dried, heated in an oven for an hour at 250 oC, mashed into powder, weighted as much as (g) 1; 2; 3; 4; and 5, dissolved into 100 ml distilled water, filtered, and characterized using UV-Vis, PL, and FTIR. The photo-degradation experiment was conducted for pure waste, waste + CDs, and waste + CDs + UV light, then the BODs were measured. The CDs reduced the wastes to 14.29% and 53.90% without and with UV light, respectively. The pure wastes, wastes + CDs, and wastes + CDs + UV light produced BOD values of (mg/l) 385; 200; and 135, respectively. The decrease in BOD showed that CDs with and without UV light successfully restore dissolved oxygen in the wastes.
Pendampingan Eksperimen Fisika Bagi Siswa-Siswa SMA di Surabaya Elisabeth Pratidhina; Kurniasari Kurniasari; Budijanto Untung; Herwinarso Herwinarso; Anthony Wijaya; Bergitta Dwi Anawati; Jane Koswojo; Johanes VD Wirjawan; Sugimin Sugimin
Aksiologiya: Jurnal Pengabdian Kepada Masyarakat Vol 4, No 1 (2020): Februari
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/aks.v4i1.3069

Abstract

ABSTRAK Fisika adalah ilmu yang sangat erat dengan kehidupan sehari-hari dan menjadi tonggak perkembangan teknologi. Oleh sebab itu, mata pelajaran fisika diberikan pada siswa-siswa Sekolah Menengah Atas (SMA). Pembelajaran Fisika harusnya menekankan pada pengalaman langsung untuk mengembangkan kompetensi agar siswa mampu memahami fenomena alam. Hal ini akan membantu siswa untuk memperoleh pemahaman yang lebih mendalam. Akan tetapi, banyak sekolah-sekolah di Indonesia tidak memiliki peralatan yang cukup memadai untuk menunjang pembelajaran eksperimen, termasuk beberapa SMA di daerah Surabaya dan sekitarnya. Program Studi Pendidikan Fisika sebagai institusi yang mencetak calon guru-guru fisika perlu memberikan andil dalam mengatasi keterbatasan yang dimiliki oleh SMA-SMA di Surabaya dan sekitarnya. Program Studi Pendidikan Fisika memiliki peralatan dan sumber daya manusia yang cukup memadahi sehingga memungkinkan untuk mengadakan program pengabdian masyarakat berupa Pendampingan Eksperimen Fisika untuk Siswa-Siswa SMA. Program ini telah terlaksana sejak September 2018 hingga April 2019 melibatkan 14 sekolah mitra dengan jumlah siswa yang berpartisipasi sebanyak 1259 siswa. Kegiatan ini mendapatkan respon yang baik dari pihak sekolah, guru fisika, dan para siswa. Melalui kegiatan ini, keterbatasan peralatan eksperimen di sekolah cukup teratasi. Para siswa juga antusias sebab dengan kegiatan eksperimen pembelajaran fisika menjadi lebih menarik.Kata Kunci: eksperimen fisika; pengabdian kepada masyarakat; sekolah menengah atas.ABSTRACT Physics is closely related to our daily life and becomes a fundamental subject for technology development. That is why physics is given to high school students. The physics learning process should emphasize direct experience to guide students in understanding phenomena in nature. The direct experiment will stimulate students to develop their in-depth knowledge.   However, most schools in Indonesia, including in Surabaya, do not have adequate experiment apparatus to support that physics learning activity with experiments.  Department of Physics Education, as an institute that educates pre-service physics teachers, should contribute to solving the limitation of some senior high schools in Surabaya. Department of  Physics Education in Widya Mandala Catholic University has sufficient experiment facilities and human resources to conduct a community service program in the form of Physics Experiment Assistance for High School Students. The program has been conducted from September 2018 until April 2019. There are 14 schools attendinng this program, with 1259 students involved. This program gains positive responses from school principals, physics teachers, and students. Through this program, the limitation of several high schools in providing experiment facilities can be partially solved. Students who involve in this program are enthusiastic because, through experiments, physics learning activity becomes more interesting. Keywords: community service; physics experiment; senior high school.
Education 4.0: Pergeseran pendidikan sebagai konsekuensi revolusi industri 4.0 Elisabeth Pratidhina
Humanika, Kajian Ilmiah Mata Kuliah Umum Vol 20, No 1 (2020): Humanika, Kajian Ilmiah Mata Kuliah Umum
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/hum.v20i1.29290

Abstract

Industrial Revolution 4.0 is changing how we live, work, and communicate. The education field should develop to adapt to the revolutionary changes that happen in the world recently. Industrial revolution 4.0 makes shifted paradigm in education. Education 4.0 is the desired approach to learning that aligns itself with the emerging fourth industrial revolution. It brings up the well-known educational concepts such as self-directed learning and long-life learning. This paper discuss shifting educational theory in Education 4.0 and the phenomenon of the emerging new education technology which attempts to fill the need for self-directed learning dan long-life learning.
An extension of Gibbs variational principle for canonical partition function Elisabeth Pratidhina Founda Noviani; Wipsar Sunu Brams Dwandaru
Jurnal Sains Dasar Vol 2, No 1 (2013): April 2013
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.442 KB) | DOI: 10.21831/jsd.v2i1.3577

Abstract

Abstract   A variational principle is derived based upon the canonical partition functions. This variational principle is obtained using the Gibbs variational principle. Firstly, the Gibbs variational principle is highlighted for the canonical ensemble. Then, the Gibbs variational principle is modified such that a variational principle concerning the partition function is obtained. The latter variational principle is useful as the canonical partition function is an important quantity in deriving many thermodynamic quantities of a physical system based upon the distribution of the constituents that makes up the system.   Key words: variational principle, Gibbs variational principle, partition function
KARAKTERISASI CARBON NANODOTS BERBAHAN DASAR LIMBAH IKAN TONGKOL Elisabeth Pratidhina; Michael Jurdan; Pearl Abigail Ermanto; Johan Prabowo; Johannes Benedictus Vidi Atmanjaya; Maria Margareta Meylinda Bhoki
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 6 No 2 (2021): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v6i2.6842

Abstract

Abstrak Carbon nanodots (CDs) adalah nanomaterial yang memiliki karakteristik dapat memancarkan cahaya setelah menyerap cahaya dengan panjang gelombang yang berbeda. Carbon nanodots (CDs)juga dikenal memiliki sifat optik yang baik, mudah larut dalam air, stabil, memiliki toksisitas rendah, dan dapat disintesis dengan metode sederhana. Carbon nanodots (CDs)dapat dibuat dari limbah biomassa seperti limbah ikan tongkol. Penelitian ini dilakukan untuk melakukan karakterisasicarbonnanodots dari limbah ikan tongkol. Karakterisasicarbon nanodots (CDs)secara berturut-turut dilakukan dengan penjemuran tulang ikan selama 8 hari, pengovenan pada suhu 2000C selama 1 jam, penghancuran dengan grinder, dan pengovenan kembali pada suhu 2500C dengan lama waktu pengovenan 2 jam, 3 jam, dan 4 jam. Penyiapan sampel dilakukan dengan mencampurkan masing-masing 1 gram bubuk hasil pengovenan dengan akuades 50 mL. Campuran kemudian secara berturut-turut diaduk selama 30 menit, didiamkan selama 30 menit, di centrifuge, dan disaring. Sampel kemudian dikarakteristik dengan analisis UV-Vis dan PL untuk menganalisis sifat-sifat optis. Analisis FTIR juga dilakukan untuk mengidentifikasi gugus fungsi. Berdasarkan analisis UV-Vis, semua variasi sampel menunjukkan panjang gelombang puncak absorbsi sekitar 265 nm. Berdasaran analisis PL, sampel menunjukkan intensitas maksimum pada panjang gelombang antara 470-500 nm, sehingga carbon nanodots mengemisikan cahaya berwarna biru ketika disinari dengan senter UV. Gugus fungsi yang tampak dari analisis FTIR adalah C=C, CºC, O-H, dan C=O=C. Abstract Carbon nanodots (CDs) are nanomaterials that have the characteristics of being able to emit light after absorbing light with different wavelengths. Carbon nanodots (CDs) are also known to have good optical properties, are easily soluble in water, are stable, have low toxicity, and can be synthesized by simple methods. Carbon nanodots (CDs) can be made from biomass waste such as tongkol (Euthynnus affinis) waste. This research was conducted to characterize carbon nanodots from tongkol (Euthynnus affinis) waste. The characterization process are drying the fish bones for 8 days, placing in the oven at 2000C for 1 hour, crushing with a grinder, and placing again in the oven at 2500C for 2 hours, 3 hours, and 4 hours. The sample preparation are mixing 1 gram of each powder with 50 mL aqudes, stirring up the mixture for 30 minutes, standing it for 30 minutes, centrifuging, and filtering. The samples were characterized by UV-Vis and PL analysis to analyze their optical characteristics. FTIR analysis also carried out to identify the functional groups. Based on the UV-Vis analyzes, all the different samples showed the peak absorption wavelength around 265 nm. Based on the PL analyzes, the wavelength maximum intensity is between 470 and 500 nm and emitted blue light when irradiated with a UV flashlight. The functional groups shown from FTIR are C=C, CºC, O-H, andC=O=C.
Co-Authors Anak Agung Gede Sugianthara Anthony Wijaya Bergitta Dwi Anawati Budijanto Untung Herwinarso . Jane Koswojo Johan Prabowo Johanes VD Wirjawan Johannes Benedictus Vidi Atmanjaya Kurniasari Kurniasari Maria Margareta Meylinda Bhoki Michael Jurdan Nurohman, Yosi Pearl Abigail Ermanto Sari, Emi Kurnia Sugimin Sugimin Wipsar Sunu Brams Dwandaru wipsar sunu brams dwandaru