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Sistem Fotobioreaktor dilengkapi Pemantauan Konsentrasi CO2 dari Kabut Asap pada Model Kebakaran Lahan Gambut Azzahra Zhuhrii; Harmadi Harmadi
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.827-833.2024

Abstract

Indonesia's peatlands are quite extensive and often cause fires that lead to haze. Haze contains harmful compounds, namely carbon dioxide (CO2). One of the efforts to reduce CO2 content is using a microalgae Chlorella vulgaris photobioreactor system. This research makes a photobioreactor system equipped with monitoring the concentration of CO2 emissions from haze on a peatland fire model. The photobioreactor is equipped with an MQ-135 sensor to detect CO2 concentration and an LM35 sensor to determine changes in temperature in the microalgae container. The temperature in the microalgae container is set in the range of 25ºC30ºC according to the habitat of microalgae. The output data from the sensors is processed by Arduino Uno R3. The measurement results of CO2 concentration and temperature are displayed on the I2C LCD in units of ppm and ºC. This study uses a variety of light sources in the form of red, green, blue LEDs and sunlight. The results of the study found that blue LED lights play a more active role to increase the ability of microalgae to reduce CO2 emissions in the room. The photobioreactor system using Chlorella vulgaris microalgae is able to reduce the concentration of CO2 produced from haze in the peatland fire model of 655.08 ppm down to 620.47 ppm within 1 hour.
Analisis Sensitivitas Sensor GY-ML8511 dalam Deteksi Formalin M. Farhan Ramadhan; Meqorry Yusfi; Harmadi Harmadi
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.684-689.2024

Abstract

Food safety is a crucial aspect in meeting people's nutritional needs. Formalin, a dangerous preservative, is often used illegally to extend the shelf life of foodstuffs, posing serious risks to consumer health. This research develops a portable technology for rapid detection of formaldehyde in foodstuffs. The method utilizes the interaction between UV light and the concentration of formaldehyde in a sample treated with Schiff reagent, enabling the measurement of UV uptake proportional to formaldehyde concentration. The Schiff reagent reacts with formalin to produce a colored compound whose absorbance is measured to detect and quantify formalin in the sample. The designed optical system focuses on measuring the intensity of light from a UV LED source, which is then transmitted through the sample. The successfully transmitted light intensity is converted into an electrical signal by the GY-ML8511 sensor, which is then processed by the NodeMCU ESP8266 to display the concentration of formalin on the LCD screen. This research also analyzes the sensitivity and selectivity of the GY-ML8511 sensor to evaluate its performance and reliability in detecting formaldehyde, with the ultimate goal of improving food safety through innovative detection technologies, such as the use of biosensors and advanced spectroscopy. This technology contributes to existing solutions by enabling rapid and accurate detection at various stages of food production, thereby reducing the risk of contamination and improving compliance with food safety standards
Rancang Bangun Alat Ukur Tekanan Hidrostatis dan Kedalaman Perairan Berbasis Sensor Serat Optik M Fachri Yunus; Harmadi Harmadi
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.718-724.2024

Abstract

The design of hydrostatic pressure and water depth measuring instrument based on optical fiber sensor using intrinsic method has been carried out. The design of this hydrostatic pressure and water depth measuring instrument consists of fiber optic sensors which include a light source in the form of a 5V diode laser, FD-620-10 optical fiber as a light transmission medium and OPT101 photodetector. Arduino Uno R3 board as a data processor, and I2C LCD as a viewer of measurement results. Characterization of the fiber optic sensor is done by varying the bending based on the number of serrations that cause differences in output voltage on the fiber optic sensor. Optimal results were obtained when the serrations amounted to 5 with a sensitivity value of -0.0863 V/kPa. The maximum hydrostatic pressure that can be measured is at a water depth of 1.5 m. The measurement results of hydrostatic pressure and water depth obtained with the designed tool against the theory and comparison tool obtained a percentage error of 4.42% and 4.32%, respectively
Penguatan Usaha Pedagang Kuliner - Shelter Kota Barat - Solo Honggowati, Setianingtyas; Hadinugroho, Bambang; Suhari, Endang; Harmadi, Harmadi; Tamara, Yohana
Jurnal Pengabdian Masyarakat Progresif Humanis Brainstorming Vol 7, No 4 (2024): Jurnal Abdimas PHB : Jurnal Pengabdian Masyarakat Progresif Humanis Brainstormin
Publisher : Politeknik Harapan Bersama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30591/japhb.v7i4.7636

Abstract

Usaha Mikro, Kecil, dan Menengah (UMKM) bidang kuliner di Kota Barat, Solo menghadapi berbagai tantangan dalam era globalisasi dan digitalisasi saat ini. Tantangan tersebut antara lain adalah keterbatasan dalam teknologi digital, literasi digital yang rendah, dan akses terbatas terhadap permodalan dan informasi pasar. Untuk menjawab permasalahan ini, program pengabdian ini dilaksanakan dengan melibatkan Paguyuban Pedagang Kuliner Kota Barat, Solo yang terdiri dari 40 UMKM. Program ini bertujuan untuk meningkatkan partisipasi aktif UMKM pedagang kuliner, memperluas pengetahuan dan keterampilan manajemen usaha melalui pemanfaatan teknologi digital, serta mengupayakan peningkatan pendapatan mereka melalui program pendampingan. Program ini menggunakan metode berupa  analisis kebutuhan, penyampaian materi oleh narasumber berpengalaman, diskusi interaktif untuk merumuskan solusi bersama, serta monitoring yang dibantu oleh mahasiswa. Hasil dari kegiatan pengabdian masyarakat ini mencatat pertumbuhan signifikan dalam partisipasi, pengetahuan, keterampilan, dan pendapatan pedagang kuliner di Kota Barat, Solo. Selain itu, meski tidak diukur secara statistik, terdapat indikasi peningkatan nilai ekonomis dan kepuasan dari mitra, yang ditandai dengan mereka yang mengharapkan program serupa di masa depan. Luaran program ini termasuk publikasi ilmiah, publikasi media, dan video dokumentasi, yang menjadi model efektif dalam pengembangan UMKM kuliner serta berkontribusi positif terhadap ekonomi lokal.
Profit Balance, Stock Trading Volume, Return On Investment And Stock Prices Putra, Ardian Prima; Sari, Pristin Prima; Harmadi, Harmadi
EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi dan Bisnis Vol 13 No 2 (2025): April
Publisher : UNIVED Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37676/ekombis.v13i2.7011

Abstract

The purpose of the research is to empirically test the profit balance of stock prices, stock trading volume and return on invested capital (ROI). This research method used quantitative linear regression analysis using SPSS IBM 20. The information comes from the quarterly financial reports listed in the Indonesian Stock Exchange for the years 2018-2020. The results of the F-test show that the earnings ratio, stock market trading volume and return on invested capital (ROI) have a significant impact on stock prices. At the same time, the t-test shows that profit balance, stock trading volume and return on invested capital (ROI) partially significantly affect stock prices.
Education of Disaster Awareness through Disaster Readiness Socialization as an Effort to Increase Community Knowledge around the Nobita Hill Tourism Area on Disaster Mitigation Marzuki Marzuki; Mutya Vonnisa; Harmadi Harmadi; Dwi Pujiastuti; Arif Budiman; Dwi Puryanti; Sri Oktamuliani; Imam Taufiq; Meqorry Yusfi; Rahmat Rasyid; Astuti Astuti; Sri Handani; Sri Rahayu Alfitri Usna; Dian Fitriyani; Elvaswer Elvaswer; Muhammad Arif; Muhammad Kahfi; Naela Amalia Zulfa; Iqbal Ramadhan; Nurul Hasanah; Feriska Handayani Irka
Warta Pengabdian Andalas Vol 31 No 2 (2024)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.31.2.353-361.2024

Abstract

Nobita Hill, a tourist site in Padang City, is undergoing development as a tourist destination that offers a bird's-eye view of Padang City. Unfortunately, the hilly topography with steep slopes increases the risk of landslides in this area. In order to address the problem, the community service team from the Physics Department of Andalas University has carried out a six-month community service program from July to December 2022. It focused on disaster awareness education and used a qualitative approach. This activity aims to socialize disaster mitigation efforts, especially those related to landslides and earthquakes, considering that Padang City is also prone to earthquakes. The results of this activity showed an increase in the knowledge of the local community after the socialization, but repeated activities are needed to achieve optimal results. This ongoing activity is essential to ensure continuous improvement in the community's understanding of disaster mitigation and to support efforts to make Bukit Nobita a disaster-resilient area. Thus, this activity makes a positive contribution to shaping a safe, sustainable, and disaster-resilient tourism environment.
Analisis Sensitivitas Sensor GY-ML8511 dalam Deteksi Formalin Ramadhan, M. Farhan; Yusfi, Meqorry; Harmadi, Harmadi
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.684-689.2024

Abstract

Food safety is a crucial aspect in meeting people's nutritional needs. Formalin, a dangerous preservative, is often used illegally to extend the shelf life of foodstuffs, posing serious risks to consumer health. This research develops a portable technology for rapid detection of formaldehyde in foodstuffs. The method utilizes the interaction between UV light and the concentration of formaldehyde in a sample treated with Schiff reagent, enabling the measurement of UV uptake proportional to formaldehyde concentration. The Schiff reagent reacts with formalin to produce a colored compound whose absorbance is measured to detect and quantify formalin in the sample. The designed optical system focuses on measuring the intensity of light from a UV LED source, which is then transmitted through the sample. The successfully transmitted light intensity is converted into an electrical signal by the GY-ML8511 sensor, which is then processed by the NodeMCU ESP8266 to display the concentration of formalin on the LCD screen. This research also analyzes the sensitivity and selectivity of the GY-ML8511 sensor to evaluate its performance and reliability in detecting formaldehyde, with the ultimate goal of improving food safety through innovative detection technologies, such as the use of biosensors and advanced spectroscopy. This technology contributes to existing solutions by enabling rapid and accurate detection at various stages of food production, thereby reducing the risk of contamination and improving compliance with food safety standards
Rancang Bangun Alat Ukur Tekanan Hidrostatis dan Kedalaman Perairan Berbasis Sensor Serat Optik Yunus, M Fachri; Harmadi, Harmadi
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.718-724.2024

Abstract

The design of hydrostatic pressure and water depth measuring instrument based on optical fiber sensor using intrinsic method has been carried out. The design of this hydrostatic pressure and water depth measuring instrument consists of fiber optic sensors which include a light source in the form of a 5V diode laser, FD-620-10 optical fiber as a light transmission medium and OPT101 photodetector. Arduino Uno R3 board as a data processor, and I2C LCD as a viewer of measurement results. Characterization of the fiber optic sensor is done by varying the bending based on the number of serrations that cause differences in output voltage on the fiber optic sensor. Optimal results were obtained when the serrations amounted to 5 with a sensitivity value of -0.0863 V/kPa. The maximum hydrostatic pressure that can be measured is at a water depth of 1.5 m. The measurement results of hydrostatic pressure and water depth obtained with the designed tool against the theory and comparison tool obtained a percentage error of 4.42% and 4.32%, respectively
The Effect of Product Quality on Customer Loyalty through Consumer Satisfaction and Company Reputation Alfionita, Hilda; Harmadi, Harmadi; Selliandro, Octano; Soesilo, Primidya
Research Horizon Vol. 5 No. 2 (2025): Research Horizon - April 2025
Publisher : LifeSciFi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54518/rh.5.2.2025.547

Abstract

This study examines the influence of product quality on customer satisfaction, corporate reputation, and its impact on customer loyalty among active participants of PT. Taspen (Persero) in Indonesia. It employs an explanatory research design with a sample of 240 respondents selected using a random sampling method. Sampling was conducted at five branch offices with the largest number of active participants. The data analysis method used was Structural Equation Modelling with Partial Least Squares (SEM-PLS). The findings reveal that product quality has a positive and significant effect on customer satisfaction. However, product quality does not significantly affect corporate reputation. Additionally, both customer satisfaction and corporate reputation have a significant positive effect on customer loyalty. This indicates that when customers are satisfied and perceive a good corporate reputation, they are more likely to remain loyal and continue using services. The study highlights the importance of customer satisfaction as a key driver of loyalty, even more than corporate reputation in this context. These results provide valuable insights into improving service strategies.
Distribusi Kasus Tuberkulosis Paru Menurut Usia, Jenis Kelamin, dan Capaian Program Di Puskesmas Bukit Sangkal, Palembang Tahun 2024 Nurannisyah , Rizky; Najmah, Najmah; Apritama , Faris; Rapika Dianita, Nesya; Damai Kasih Waruwu, Prischila; Khoirunnisa, Khoirunnisa; Pridamayanti, Arviana; Harmadi, Harmadi; Syafrida Putri, Rica; Ruliansyah, Denny
JUKEJ : Jurnal Kesehatan Jompa Vol 4 No 1 (2025): JUKEJ: Jurnal Kesehatan Jompa
Publisher : Yayasan Jompa Research and Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57218/jkj.Vol4.Iss1.1505

Abstract

Tuberkulosis paru (TBC) masih menjadi masalah kesehatan serius, terutama di wilayah padat penduduk. Penelitian ini bertujuan untuk menggambarkan distribusi kasus TB paru berdasarkan usia, jenis kelamin, dan capaian layanan di Puskesmas Bukit Sangkal tahun 2024. Desain penelitian yang digunakan adalah deskriptif kuantitatif dengan pendekatan potong lintang. Seluruh kasus TB paru yang tercatat dalam sistem pelaporan SITB (Sistem Informasi Tuberkulosis) selama periode tersebut dijadikan sampel melalui teknik total sampling, dengan jumlah total 25 kasus. Variabel penelitian meliputi usia, jenis kelamin, waktu kejadian, dan capaian program. Data diperoleh dari dokumentasi laporan program TBC dan rekam medis, lalu dianalisis secara deskriptif kuantitatif menggunakan perangkat lunak Microsoft Excel. Hasil menunjukkan proporsi kasus lebih tinggi pada laki-laki (52%) dibandingkan perempuan (48%), dan proporsi kasus tertinggi pada kelompok usia 0-14 tahun (32%), diikuti usia 25-44 tahun (24%) dan usia ≥60 tahun (28%). Lonjakan kasus terjadi pada Januari, Februari, dan Mei. Capaian pelayanan terhadap terduga TB mencapai 98%. Kesimpulannya bahwa anak-anak dan laki-laki usia produktif merupakan kelompok risiko tinggi. Temuan ini berguna untuk pengelola program TB dalam menyusun intervensi berbasis usia dan gender, serta sebagai dasar kebijakan skrining dini, edukasi keluarga, dan imunisasi di tingkat layanan primer.
Co-Authors Abdul Jailani Gusri Adhiani, Sylvia Adhitya Rolando Erlangga Adhitya Rolando Erlangga, Adhitya Rolando Adila Nadia Adrial, Rico Adrian, Diana Rahmi Afdal Afdal Afdhal Muttaqin Agus Rubiyanto Agustini, Meta Agustri, Novia Dwi Ahmad Fauzi Pohan Aida Rahayu Akrajas Ali Umar Akram, Muhammad Zulhady Alawiya, Tuti Aldo Novaznursyah Costrada Alfionita, Hilda Alfraidila, Fadil Alimin Mahyudin Alwan, Muhammad Naufal Aminah Nurrrahmawati Ammari, Syafiq Andeskob Topan Indra Andeskob Topan Indra Ani Fatimah Ani Fatimah, Ani Anindy Bahri Annisa Oktaviani Putri Apritama , Faris Arif Budiman Arifah, Azizah Ghina Arisanti, Nova Jane Arsis, Asi Noflanda Asi Noflanda Arsis Astuti Astuti Astuti Astuti Astuti Aulia Rabiyu Rizky Awaluddin Awaluddin Awaluddin Awaluddin Ayu Afifah Al-Farzaq Ayu Putri Ningsih Ayu, Fivi Tri Azizah Ghina Arifah Azizah Ghina Arifah Azizah, Nurhalimah Azmi Wahyu Anggita Azmi Wahyu Anggita, Azmi Wahyu Azzahra Zhuhrii Azzahra, Nayla Khanisa Bahri, Anindy Bambang Widiyatmoko Basri, Feri Helmi Bayu Hadi Saputro Bayu Hadi Saputro Bayu Hadi Saputro, Bayu Hadi Biolita, Nadya Okta Cahyandari, Joanica Intan Cahyani, Harum Cahyani, Putri Aqmah Costrada, Aldo Novaznursyah Dahyunir Dahlan Damai Kasih Waruwu, Prischila Damayanti, Elok Dea Kurnia Harysandi Dedi Mardiansyah Della Rahmawarni Denny Ruliansyah Deswilan, Sixtinah Dewita, Novia Ratna Diah Sundari Dian Fitriyani Dian Milvita Diana Rahmi Adrian Dwi Pujiastuti Dwi Puryanti Egri Junita El Basthoh Elfira Saufina Elistia Liza Namigo, Elistia Elma Yusnita Elma Yusnita, Elma Elvaswer Elvaswer Elvina, Yuli Esana, Ria F Febrielviyanti Fadil Alfraidila Fajri Fachrezy Hamid Fajrul Huda Farah Syauqi Farhana, Salwa Febriyanti, Theresia Utpala Feri Helmi Basri Feriska Handayani Irka, Feriska Handayani Firmansyah - Firmansyah - Firmansyah Firmansyah Fitri, Khairini Fitri, Riska Maya Fitri, Sari Widya Fitria Khairunnisa Furda, Yani Prihatina Gatut Yudoyono Genta Kampai Gusri, Abdul Jailani HADINUGROHO, BAMBANG Hamid, Fajri Fachrezy Harum Cahyani Haryanto Saputra Havizzullah Havizzullah Havizzullah, Havizzullah Hawariyi Ola Yuzria Hawariyi Ola Yuzria Helmi Yusnaini Hertanti, Ferra Hidayati, Miskhatul Hiroyuki Hashiguchi Hiroyuki Hashiguchi Hiroyuki Hashiguchi Hiroyuki Hashiguchi, Hiroyuki Honggowati, Setyaningtyas Huda, Fajrul I Kadek Agus Sara Sawita Ikhsan, Khairatul Ikhsan, Lukita Sari Ikhwani, Miftah Imam Taufik Imam Taufiq Inggi Dwi Putri Inggi Dwi Putri Iqbal Ramadhan Irawan, Tomi Isdi, Muhammad Ridho Ismarini, Dinia J. Tongkukut Jasmine, Annisah Biancika Joanica Intan Cahyandari Juanda, Muhammad Tri Junita, Egri Kampai, Genta Kemal, Badrul Mustafa Kemal, Badrul Mustafa Khairatul Ihksan Khairatul Ikhsan Khairini Fitri Khairunisa, Khaila Sugma Khairunnisa, Fitria L. Luini Lisna Meylani Lopa, Reforma Lukita Sari Ikhsan M Fachri Yunus M Fachri Yunus M Farhan Ramadhan M. Farhan Ramadhan Maharani, Sasha Tiara Manda, Poni Dwi Mardian Peslinof Marheini, Hilda Marisa Marisa Marzuki Marzuki Marzuki Marzuki Marzuki Marzuki Mega Roza Lia Meqorry Yusfi Miftah Ikhwani Miskhatul Hidayati Mitra Djamal Mochammad Imron Awalludin Mohammad Ali Shafii Mora Mora Mora Mora Mora Muchlian, Meli Muhamad Iqbal Muhamad Iqbal Muhamad Zainuddin Muhammad Arif Muhammad Fahrizal, Muhammad Muhammad Faisal Muhammad Faisal Muhammad Kahfi Muhammad Naufal Alwan Muhammad Ridho Isdi Muhammad Shadri Muhammad Tri Juanda Muharmen Suari Muldarisnur, Mulda Mutya Vonnisa Muzirwan Muzirwan Nadia Yudia Putri Nadia, Adila Nadya Okta Biolita Naela Amalia Zulfa Najmah, Najmah Nasution, Subhan Fahmi Neneng Fitrya Nini Firmawati Nola Fridayanti Nola Fridayanti, Nola Nor Azlan Mohd Aris Novia Dwi Agustri Novia Ratna Dewita Nur Umi Latifah, Nur Umi Nuraini, Mawar Nurannisyah , Rizky Nurrahmawati, Aminah Nurrohima, Meiliza Nurrrahmawati, Aminah Nurul Hasanah Okky Frananda Putra Oktarisa, Dian Perdana, Andi Gilang pridamayanti, Arviana Putra, Ardian Prima Putra, Okky Frananda Putri, Annisa Oktaviani Putri, Inggi Dwi Putri, Lydia Atica Putri, Nadia Yudia Putri, Rachelia Anugerah Putri, Rica Syafrida Putri, Syerly Eka Rabiatul adawiyah Rabiatul Adawiyah Rahayu, Aida Rahma, Alpha Liana Yuvita Rahmad Rasyid Rahmad Rasyid Rahmat Rasyid Rahmawarni, Della Ramacos Fardela Ramadhan, M. Farhan Ramadhan, Ravidho Ramadhani Perdana Ramadhani Perdana, Ramadhani Ramadhani, Natasha Rani Delvihardini Rapika Dianita, Nesya Rasyid, Rahmad Ravidho Ramadhan Ravidho Ramadhan Reforma Lopa Rhahmi Adni Pesma Rini Oktaviani Riska Maya Fitri Riski Amalia, Riski Rizki Rizki Rizky, Aulia Rabiyu Robi Zulfahri Roni Syafrialdi Roni Syafrialdi, Roni Salahuddin Salahuddin Sandra Sandra Saputra, Haryanto Sari Widya Fitri Sari, Pristin Prima Saufina, Elfira Selliandro, Octano Seni Herlina Setianingtyas Honggowati Shadri, Muhammad Shakira, Nafisah Shimomai, Toyoshi Sholihun, Sholihun Sijabat, Zoiw Michaela Giane Siti Aisyah Siti Aisyah Siti Chadijah Sixtinah Deswilan Sixtinah Deswilan Sixtinah Deswilan Soesilo, Primidya Solly Aryza Sri Handani Sri Oktamuliani Suari, Muharmen Sugeng Nugroho Suhari, Endang Suhariningsih Sundari, Diah Suryadi Suryadi Suryanto, Wiwit Syafiq Ammari Syafrida Putri, Rica Syauqi, Farah Syerly Eka Putri TAMARA, YOHANA Tomi Irawan Topan Indra, Andeskob Toyoshi Shimomai Toyoshi Shimomai Trengginas Eka Putra Sutantyo Ulfa, Siti Zahara Nur Khatimah Usna, Sri Rahayu Alfitri Utari, Syahri Aulia Wildian Wildian Wildian Wildian Yetria Rilda Yozi Amasda Yude Yude, Yozi Amasda Yuli Elvina Yunus, M Fachri Zamora, Ronaldi Zhuhrii, Azzahra Zulfahri, Robi Zulfi Zulfi Zulfi Zulfi