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All Journal BERKALA FISIKA Sainstek SEMIRATA 2015 Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Ilmiah Pendidikan Fisika Spektra: Jurnal Fisika dan Aplikasinya JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Jurnal Teori dan Aplikasi Fisika Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Pelita Eksakta Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Jurnal Humanities Pengabdian Kepada Masyarakat Jurnal Ilmiah Profesi Pendidikan Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Journal of Comprehensive Science MASALIQ: Jurnal Pendidikan dan Sains Journal of Innovative Physics Teaching (JIPT) Journal of Climate Change Society Physics Learning and Education Journal of Experimental and Applied Physics
Yenni Darvina
Universias Negeri Padang
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Health Professions Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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Characterization of Pig, Cow and Goat Raw Skin Using E-Nose for Visual Data Comparison of Characteristics of Halal Skin-Processed Products Yogi Putra; Yenni Darvina; Yulkifli
Journal of Climate Change Society Vol. 1 No. 1 (2023)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jccs/Vol1-iss1/8

Abstract

The presence of questionable halal claims for various products in the market presents concerns among consumers, particularly Muslims. As a result, the need to accurately identify halal skin products has become crucial. This study focuses on differentiating pig skin from other commonly used raw materials such as cow skin and goat skin by utilizing visual characteristic data. The data was obtained through the analysis of samples using a chemometric-based electronic nose instrument, which detected volatile organic compounds (VOCs) through metal oxide semiconductor sensors (TGS 26xx and TGS8xx). The samples consisted of pig skin, cow skin, and goat skin, and their specific odors were measured and represented in line graphs, revealing distinct odor patterns detected by the sensors. The analysis revealed that pig skin exhibited the highest and increasing trend line, indicating a higher concentration of VOCs and an intense odor. Cow skin displayed a moderate trend line with lower concentrations of VOCs, while goat skin showed a lower trend line compared to cow skin but possessed strong odor properties. The analysis employed the linear discriminant analysis (LDA) method, which further confirmed these characteristics by generating line graphs that demonstrated significant differences, particularly in pig skin. The LDA plot graphs presented clear groupings of the original pig skin, cow skin, and goat skin data. Discriminant function 1 accounted for 89.13% of the grouping, while discriminant function 2 accounted for 10.87%, resulting in a total value of 100% for the discriminant function. In conclusion, this research establishes a clear distinction between pig skin and cow/goat skin based on their odor characteristics and sensor data. The LDA plot graphs serve as a valuable visual tool for identifying the characteristics of halal products. By utilizing this approach, consumers, especially those seeking halal-certified skin products, can make informed choices and have greater confidence in their purchasing decisions.
Effect of Variation in Pineapple Leaf Fiber Composition with Polyurethane Matrix in Composite Panels on Acoustic Properties and Porosity Putra Adil; Yenni Darvina; - Ramli; Rio Anshari
PILLAR OF PHYSICS Vol 16, No 2 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14571171074

Abstract

Noise can cause medical, psychological, and environmental disturbances. One of the efforts to reduce noise is by using acoustic materials. Acoustic materials can be made using natural fiber composites. This study uses pineapple leaf fiber as fiber and polyurethane as a matrix that will be formed into a sound-absorbing composite panel. This study aims are to determine the effect of variations in the composition of pineapple fiber-reinforced composites with polyurethane matrix on acoustic properties and porosity, determine the effect of frequency on acoustic properties, and determine the relationship between porosity and acoustic properties. The method used in this research uses a characterization tool in the form of a one-microphone impedance tube and porosity test equipment. Composite panels are made by varying the composition of pineapple leaf fibers with polyurethane matrix with the ratio of pineapple leaf fiber composition to polyurethane matrix, namely 50%: 50%, 60%: 40%, 70%: 30%, 80%: 20% and 90%: 10%. Based on the research, it was  found that the more the amount of pineapple leaf fiber composition is used, the absorption coefficient, sound transmission loss, and prostitution will increase while the reflection coefficient decreases. The higher the frequency used, the absorption coefficient and sound transmission loss will increase while the reflection coefficient decreases for all frequencies. The relationship between porosity and acoustic properties is that the higher the porosity, the absorption coefficient and sound transmission loss will increase while the reflection coefficient decreases
Analysis of Microwave Absorption Properties of Graphene Oxide from Rice Husk Waste Andari Oktafiani; Ramli Ramli; Yenni Darvina; Gusnedi Gusnedi
PILLAR OF PHYSICS Vol 16, No 2 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12996171074

Abstract

Graphene Oxide (GO) was synthesized with variations in carbonization temperatures of 250 °C, 300 °C, and 350 °C using the modified Hummers method. The results of the synthesis of  GO will then be tested for microwave absorbing properties because it can be applied in various fields, such as information technology, medical equipment, industry, polymer synthesis, and organic synthesis. Therefore, in this report, GO uses rice husk waste instead of graphite as a carbon source because rice husk waste is abundant in nature and easy to obtain than graphite. In addition to reducing waste in Indonesia, this study aimed to determine the crystal size and GO functional groups and analyze the properties of microwave absorbers. X-ray diffraction (XRD) was used to determine the crystal size. The GO functional groups were determined using Fourier Transform Infrared (FTIR), and the microwave absorption characteristics of GO were analyzed using a Vector Network Analyzer (VNA). The XRD results show GO peaks between 26° peaks and 44° peaks. In the FTIR results, there are a collection of GO practices, in particular CO, C = C, and C = O. In the VNA results, the best microwave absorption properties are at an ignition temperature of 350 °C with the lowest reflection value - 39.95 dB, the highest absorption coefficient is 99%, and the absorption bandwidth is 0.06 GHz at a frequency of 8.5 GHz
Effect of Variation in Tapioca Adhesive Composition on Quality of Coconut Pulp Charcoal Bio-Broquette Hrp, Abdul Maulub; Darvina, Yenni; Gusnedi, -
PILLAR OF PHYSICS Vol 17, No 1 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15154171074

Abstract

Energy needs and consumption are still increasing, while energy sources continue to decrease due to their non-renewable nature. Renewable energy sources are needed as a substitute for alternative energy that is renewable, cheap, and environmentally friendly. Making bio-broquettes from coconut pulp charcoal is one of the studies that need to be studied and developed at this time. The abundance of coconut pulp waste is still not optimally utilized in managing its potential as a material for making bio-broquette. The composition of the adhesive used determines the quality of the bio-broquettes. This study aims to determine the effect of variations in the composition of tapioca adhesive on the calorific value, moisture content, density, ash content, fly content, carbon content, and burning rate of bio-broquettes. The material used for making bio-broquettes is coconut pulp charcoal. While the composition of tapioca adhesive that is varied is 30%, 40%, and 50%. The research used an experimental method, with 3 test treatments for each sample. The results obtained with 30%, 40%, and 50% tapioca adhesive for all test parameters have met the quality standards of charcoal bio-broquettes based on SNI 01-6235-2000. The best composition of tapioca adhesive is bio-broquettes that have a ratio of coconut pulp charcoal with 70% tapioca adhesive: 30% which produces the highest calorific value of 6,825.79 cal/gram, the lowest moisture content of 5.66%, density of 2.25 grams/cm3, the lowest ash content of 2.82%, the lowest fly substance content of 3.17%, the highest carbon content of 88.35%, and the highest burning rate of 0.1032 grams/minute
The Impact of Biostarter Em-4 and Buffalo Feces on The Quality of Biogas Created from Sugarcane Bagasse Fiber Zoni, Muhammad Ari; Darvina, Yenni; Ratnawulan, -
PILLAR OF PHYSICS Vol 17, No 1 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15394171074

Abstract

Energy is one of the most important needs in life. That’s because all human activities require energy to live. New breakthroughs need to be made to overcome the energy crisis, one of which is biogas by utilizing waste. Waste that can be used is sugarcane bagasse and buffalo feces, which have the potential to produce biogas. The purpose of this study was to determine the effect of a mixture of bagasse fiber and buffalo manure with the addition of EM-4 biostarter and without EM-4 biostarter that has the potential to produce biogas. Variations in the composition of AT and buffalo feces in this study were 50%SB: 50%BF, 40%SB:60%BF and 30%SB:70%BF without using the EM-4 biostarter. batch-type digester reactor type. The method used is the experimental method. The results showed that biogas production from the composition of a mixture of bagasse fiber with buffalo feces has an influence. Where the more buffalo feces added, the more gas produced. Then for the biogas production process using EM-4 biostarter and without EM-4 biostarter, it was found that the best in producing gas was using EM-4 biostarter, this was due to the function of biostarter which accelerates biogas fermentation so that the influence on biogas production was to use EM-4 biostarter
Validity Of Teaching Materials Based Project Based Learning On Renewable Energy For Phase E Nur Anisa; Darvina, Yenni; Desnita, Desnita; Gusnedi, Gusnedi
Jurnal Pendidikan Tambusai Vol. 7 No. 3 (2023): Desember 2023
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v7i3.10388

Abstract

Changes in learning demands over time mean that the curriculum in education also changes. The new curriculum currently being used is the Merdeka curriculum. This curriculum change requires educators to be prepared to prepare learning materials that are appropriate to learning objectives. This research purpose to develop based teaching materials project-based learning on phase E renewable energy materialsvalid. This research includes research and development research carried out through 4D models. This research was only carried out in three research stages, namely the define, design and development stages. Research have limitation in development stage to determine product validity. Validity analysis was carried out on four components which include appropriateness of content, language, presentation and graphics. The data collection instrument used was a validity assessment questionnaire using a Likert scale. Validity data analysis using the V'Aikens equation. The research results showed that based teaching materials project-based learning Phase E renewable energy material is considered to have high validity. So, the teaching materials developed are suitable for use in physics learning for class X high school renewable energy material.
Validity Of LKPD Based Project Based Learning On Global Warming Material For Phase E Students At SMAN 1 Banuhampu Fio Adella Illahi; Darvina, Yenni; Desnita, Desnita; Gusnedi, Gusnedi
Jurnal Pendidikan Tambusai Vol. 7 No. 3 (2023): Desember 2023
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v7i3.10393

Abstract

The implementation of an independent curriculum requires adaptation in its application, especially in the readiness of project-based teaching materials. However, the LKPD in SMA N 1 Banuhampu is still not in accordance with the standards of teaching materials needed and expected in learning using an independent curriculum.The research method used in this research is R&D with a 4D research model consisting of four research steps, namely define, design, development, and desseminate. The data collection technique from this study uses a validation instrument that will be assessed by three validators. Based on the results, it was concluded that the results of making project-based learning LKPD on global warming material have obtained valid with a validity index of presentation aspects of 0.872, graphic aspects 1, feasibility aspects of content 0.914 and linguistic aspects of 0.889. Thus, project-based learning LKPD products phase E students can be used in the learning process.
Lembar Kerja Peserta Didik Berdasarkan Model Pembelajaran Generatif untuk Materi Gelombang Cahaya Kelas XI SMA Alqadri, Dheo; Akmam, Akmam; Darvina, Yenni; Riyasni, Selma
MASALIQ Vol 4 No 6 (2024): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v4i6.4097

Abstract

This research aims to develop LKPD based on a generative learning model on light wave material for class XI SMA that is valid and practical. The generative learning model was chosen because it is able to encourage students to actively build their understanding through interaction, reflection and discussion. This model has proven effective in improving critical thinking and problem-solving skills in physics learning. The developed worksheet is designed following the syntax of the generative learning model: orientation, cognitive conflict, disclosure, construct, application, and reflection, to support in-depth learning and link theory with real application. This research uses the Research and Development (R&D) method with the 4D development model (define, design, develop, disseminate). The define stage includes needs analysis and problem identification. At the design stage, the LKPD was designed by taking into account the content, structure, and aesthetic components. The development stage involves validity testing by experts, well as practicality testing by teachers and students. The dissemination stage is planned for wider application. The results showed that this LKPD has a very high level of validity with a validation index value of 0.94 in the content aspect and 0.86 in the structure aspect, which means that this LKPD meets the eligibility standards of the Merdeka curriculum. The practicality test shows that the LKPD is very practical with a teacher assessment score of 95% and a student assessment of 87%, so it is feasible to use it in the real field because it has been declared valid and practical.
Optimization of Carbonization Temperature in the Production of Coconut Pulp-Based Activated Carbon for Thermoelectric Materials Nabila, Aliya; Darvina, Yenni; Gusnedi, -; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15346171074

Abstract

A thermoelectric generator is one of the power plants capable of converting thermal energy into electrical energy. Thermoelectricity can be derived from materials based on metal oxide composites with carbon materials, one example is the use of Copper (II) Oxide with activated carbon. Using activated carbon can help reduce thermal conductivity, which will be beneficial in its utilization as a thermoelectric material. Activated carbon comes from biomass waste that has not been fully utilized, such as coconut pulp waste. Utilization of coconut pulp waste can reduce environmental pollution and can add economic value to the waste. The goal of this research is to produce coconut pulp activated carbon at the ideal temperature for usage as thermoelectric materials. The research method used is the experimental method. Coconut pulp activated carbon is obtained through dehydration, carbonization and activation stages. The carbonization temperature variation used is at a temperature of 250ºC, 300ºC, 350ºC, 400ºC, and 450ºC. According to the results of the characterization, the yield, ash content, and bound carbon content of activated carbon decrease with increasing carbonization temperature, while the values of water content and ash content of activated carbon increase. This indicates that the activated carbon made from coconut pulp has met the requirements SNI 06-3730-1995. XRD characterization results show that coconut pulp activated carbon is amorphous and does not show sharp diffraction peaks (significant). For producing activated carbon, coconut pulp is carbonized at a temperature of 300oC to get the optimum temperature.
The Impact of Biostarter Em-4 and Cow Feces on the Quality of Biogas from Sugarcane Bagasse Fibre Fani, Meylin Sir; Darvina, Yenni; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15349171074

Abstract

Energy demand is increasing every year. The abundant and unlimited use of energy causes the supply of energy availability to be depleted. Non-renewable energy if used excessively will cause an energy crisis. This is a serious problem that must be overcome by finding alternative or renewable energy. Renewable energy can be created from biomass. Biomass from agricultural waste in the form of bagasse fibre (BF) and livestock waste in the form of cow feces (CF) can be used as biogas filling material. The problem raised in this research is the role of EM-4 biostarter and cow feces from bagasse fibre on the pH, temperature and pressure of biogas. The composition variations of AT and cow feces in this study were 50% BF : 50% CF, 40% BF : 60% CF and 30% BF : 70% CF  without using EM-4 biostarter and using EM-4 biostarter. Batch type digester reactor type. The method used was experimental method. The results show that EM-4 biostarter and cow feces affect the quality of biogas when viewed from indicators such as pH, gas pressure and gas temperature. Biostarter EM-4 accelerates the fermentation process so that more gas is produced and the gas pressure is higher. The more cow feces used, the more gas is produced. indicators of good biogas quality are indicated by blue flames. The greater the gas pressure produced, the greater the energy contained in the biogas.
Co-Authors - Afrizal - Rahmi - Ramli - Ramli - Syakbaniah - Yulkifli - Yulkifli Abdul Azis Abdul Aziz Ade Aprilia Ade Usra Berli Afdatul Zikri Ahmad Fauzi Aifah Fauziah Akmam Akmam Alif Yulanda Putri Almunazar, Fauziyah Alqadri, Dheo Alwi Nofriandi Amali Putra Ambran Hartono amira tiara wulandari Andari Oktafiani Anisa Meysi Wardi Annisa Febriani, Annisa Anofa Liona Anwar, Suci Aprilia Cahaya Ari Arfandi arifaldi arifaldi Asfaha, Auzha Hira Asrad Hafizah Asrizal Asrizal Asrizal Atika Dwi Maharani Zuler Audia, Washilla Aulia, Mhd Reyfanza Aulia Azca Aryadiva Mahengga Azura Carolina Harsani Azzahra, Zakia Bella Salsa Bella Sukma Putri Chairunnas Chairunnas Cici Ramayanti Dara Putri Pratama Desnita Desra Yarsina Dicko Maulana Syahdan Diffa Azilia Dila Alhumaira Dola Afriyenti Edi Sanjaya Elsa Imelda Elsa Okta Memori Elsa Rahmayuni everly aberta Fadhila Ulfa Jhora Fadilla Septiani Fadillah Ulfah Fakhrur Rhozy Fani, Meylin Sir Fanny Rahmatina Rahim Fatni Mufit Fatni Mutfit Fauziyah, Faadhilah Febrian Syah Febrian, Nanda Festiyed Fio Adella Illahi Firda Annisa Fitrah Ayu fitri rahmi Fitria Murti Fran Surya Andi Fredy Pratama Frima Suci Agustia Fuja Novitra Gina Fadilah NST Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hasya Syahmi Hazrati Ashel Hersha Hanifa Hidayati Hidayati Hidayati Hidayati Hidayati Hidayati Hifzi, Zudiya Hilmi Rizki Anjani Hrp, Abdul Maulub Hufri Hufri Ihsania Ikrima Kinanti Ilahi, Fitratul Indah Safira Indah Septia Ningsih Indah Tri Handini Indri Syukra Innes Andriani Iryani Iryani Ismathul Dinny Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Khairunnisa Khairunnisa Kuwat Triyana Lestra, Dila Ayu Letmi Dwiridal Lidya Agraini Lucya Sinurat Lusi Oktavia Masril Masril Masril Masril Masril Masril Masril Masril masril masril Melani Alvino Miftahurrahmah Miftahurrahmah, Miftahurrahmah Muhammad Ikmal Muhammad Rivai Murtiani Murtiani Murtiani Murtiani Mustika, Dian Putri mutia faizah apriani Mutia Risma Mutia Yussavel Navis Nabila, Aliya Nadia Ardianti Nadia Ramadhanty Nadila Putri Bungsu Nadya Aztifa Nadya Yunestika Nawiyah, Nawiyah Nazifah, Naurah Nia Nursurila Nidya Yulfriska Nidya Yulfriska Novelia Prima Nur Anisa Nur Sahfitri Nurhasanah Nurhasanah Nurhijjah Tiur S Nurmala Sari Lubis Oktavia, Vini Onny Gustira Pakhrur Razi Pertama, Indri Saputri Pratama, Rayvol Dion Pratiwi Mailisa Prima Nora Ananda Puput Mulya Sari Pusri Mela Putra Adil Putra, Amali Putri Diana Putri Dwi Sundari Putri Rasti Ramadhani Radha Firaina Rahma Tilla Dwi Lestari Rahma Yeni Rahmadini, Fadhilla Rahmat Hidayat Rahmat Hidayat Rahmi Zulva Ramadhani, Dinda Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli, - Rara Nur Rida M.Y Ratnawulan . Renol Afrizon Resti Novela Retna Junia Revi Febrina Sari Ria Monica Rifi Wasrika Rima Melani Putri Rio Anshari Riolin Putri Artiwi Riri Jonuarti Riri Raihannil Jannah Riyasni, Selma rizka fauziah Rizki Rizki Romizah Marta Salma Amalia As Shidiq Santika, Viera Alvio Sari, Mona Berlian Septia, Zahwa Setivawani, Andrisa Shinta Kumala Silmi Hidayatullah03 Silvi Trisna Silvi Yulia Sari Siti Riva Darwata Slivi Yulia Sari Solly Aryza Sonia Nur Riza Sovia Yulianti Srisa Oktaweri Suci Wahyuni Suherman, Dea Stivani Suryani Fadhilah Syafri, Syafri Syafriani - - Syafriani Syafriani Syafriani Syafriani Syafriani Syafriani Syafrinaldi Syafrinaldi Syahputra , Ilham Syair Nandi Tiwi Novalia Syahari Tri Agunaisy Tria Sukma Sandi Trio Junira Fernando Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ully Nuraidina Ummiatul Fitri Vanessa Febta Sindani Varadila Sahanaya wahyu dilla abdullah Wahyudil Hayat wahyuni hafnisyah Wahyuni Satria Dewi Widara, Rofifah Windri Suci Gaitari Yeni Mustika Sari Yogi Putra Yohandri Yohandri Bow Yolvi Oktaviani Yona Sri Mantia Yosi Febriani Yudha, Fauzan Syafril Yulhendri Yulhendri Yulia Febrina Yulia Sari, Silvi Yulkifi Yulkifi Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli, Y Yunita Ela Saputri Yuri Yanti Yurnetti Yurnetti Yurnetti Yurnetti Yurnetti, Yurnetti Zakiya, Zara Zara Zakiya Zoni, Muhammad Ari Zulhendri Kamus Zulma, Degito