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All Journal Jurnal Kesehatan Masyarakat Andalas (Andalas Journal of Public Health) ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Gizi Klinik Indonesia Jurnal Biologi Tropis Jurnal Rekayasa Sipil Jurnal Teknologi Dirgantara Transform : Journal of English Language Teaching and Learning Indonesian Journal of Aerospace
Sri Ramayanti
Fakultas Kesehatan Masyarakat Universitas Andalas
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Immunology & microbiology Languange, Linguistic, Communication & Media Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Transportation Other

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Iluminasi Panel Surya pada Satelit Orbit Rendah Ekuatorial SURYANTI, DESTI IKA; RAMAYANTI, SRI; MUKHAYADI, MOHAMMAD
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 7, No 3 (2019): ELKOMIKA
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v7i3.480

Abstract

ABSTRAKDesain satelit telah berkembang ke arah miniaturisasi untuk mengurangi biaya peluncuran. Satelit kecil menyediakan platform berbiaya rendah untuk misi luar angkasa. Salah satu permasalahan utama satelit kecil adalah terbatasnya ketersediaan daya. Karena ketersediaan daya diperlukan agar subsistem satelit dapat bekerja, maka pada proses desain satelit perlu dilakukan analisis dan estimasi ketersediaan daya selama satelit mengorbit dengan tetap mempertahankan kekompakan dan volume yang diberlakukan oleh standar. Penelitian ini bertujuan untuk mengetahui kondisi iluminasi matahari pada panel surya dari berbagai alternatif desain penempatan sehingga diperoleh sebuah desain yang efisien. Iluminasi maksimum sebuah panel surya triple junction yang terpasang secara body mounted pada satelit kurang lebih sebesar 60%. Berdasarkan hasil penelitian ini, kombinasi pemasangan 3 body mounted panel surya dan 2 simple deploy panel surya menghasilkan persentase iluminasi dua kali lipat dibandingkan 5 body mounted panel surya.Kata kunci: panel surya triple junction, iluminasi, body mounted, simple deploy, daya ABSTRACTSatellite design has envolved towards miniaturization to reduce launch costs. Small satellites provide a low-cost platform for space missions. One of the main problems with small satellites is the limited availability of power. Because the availability of power is needed so that the satellite subsystem can work, the satellite design process needs to analyze and estimated power availability as long as the satellite orbits while maintaining the compactness and volume imposed by the standard. This study aims to determine the conditions of solar illumination on solar panels from various alternative design placements in order to obtain an efficient design. Maximum illumination of triple junction solar panel mounted on a small satellite is approximately 60%. Based on the results of this study, the combination of installing 3 body mounted solar panels and 2 simple deploy solar panels produced twice the illumination percentage compared to 5 body mounted solar panels.Keywords: solar panel triple junction, illumination, body mounted, simple deploy, power
PERAN MAKANAN TERHADAP KEJADIAN KARIES GIGI Sri Ramayanti; Idral Purnakarya
Jurnal Kesehatan Masyarakat Andalas Vol 7, No 2 (2013): Jurnal Kesehatan Masyarakat Andalas
Publisher : Faculty of Public Health, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24893/jkma.v7i2.114

Abstract

Hasil Riset Kesehatan Dasar (Riskesdas) 2007 menunjukkan bahwa hampir separuh penduduk Indonesia mengalami karies gigi. Makanan kariogenik merupakan faktor penyebab utama terjadinya karies gigi bersamasama dengan faktor mikroorganisme, gigi (host) dan waktu. Karbohidrat adalah bahan yang sangat kariogenik. Gula yang terolah seperti glukosa dan terutama sekali sukrosa sangat efektif menimbulkan karies karena akan menyebabkan turunnya pH saliva dibawah 5.5 secara drastis dan akan memudahkan terjadinya demineralisasi. Gula sukrosa mempunyai kemampuan yang lebih efisien terhadap pertumbuhan mikroorganisme asidogenik dibanding jenis karbohidrat lain. Selain itu, defisiensi beberapa vitamin dan mineraljuga mendorong terjadinya karies pada gigi seperti defisiensi vitamin A, B, C, dan D,kalsium, fosfor fluor dan zinc. Oleh karena itu, tindakan pencegahan diperlukan melalui tahapan primer, sekunder dan tersier.
Flatwise Testing Modeling Study On Aluminium Honeycomb Panel Ramayanti, Sri
Jurnal Teknologi Dirgantara Vol 20, No 2 (2022): Jurnal Teknologi Dirgantara
Publisher : National Institute of Aeronautics and Space - LAPAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2022.v20.a3937

Abstract

Honeycomb sandwich structures are widely used in space applications due to their exceptional performance. Extensive research has been conducted on the response of honeycomb structures to various external loads. The out-of-plane strength, including compression and tensile properties, is a critical aspect of honeycomb structures. Despite some experimental and numerical studies, research specifically addressing the tensile direction, such as flatwise tensile testing in honeycombs, remains limited. This testing focuses on the bond strength between the face sheets and the honeycomb core, as well as the tensile strength of the core itself. Utilizing finite element analysis (FEA) has proven effective for characterizing honeycomb structures under various load conditions. However, the complex geometry of the core requires an enormous number of elements, increasing computation times. Thus, simplifying the model by replacing the hexagonal geometry with a homogenized solid layer with effective material properties is necessary. This study focuses on flatwise tensile testing of aluminum honeycomb using different modeling approaches: discrete, continuum, and equivalent plate models. The discrete model serves as the reference due to its detailed structural representation. The continuum-Gibson model, while reasonably accurate in stress estimation, tends to overestimate displacement. Both equivalent models, Hoff and Reissner, significantly overestimate displacement, with Hoff underestimating stress and Reissner overestimating it. In contrast, equivalent models offer insights, but their accuracy varies, necessitating further calibration for precise predictions. Future research should validate these simulation results with real tests
Iluminasi Panel Surya pada Satelit Orbit Rendah Ekuatorial SURYANTI, DESTI IKA; RAMAYANTI, SRI; MUKHAYADI, MOHAMMAD
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 7, No 3: Published September 2019
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v7i3.480

Abstract

ABSTRAKDesain satelit telah berkembang ke arah miniaturisasi untuk mengurangi biaya peluncuran. Satelit kecil menyediakan platform berbiaya rendah untuk misi luar angkasa. Salah satu permasalahan utama satelit kecil adalah terbatasnya ketersediaan daya. Karena ketersediaan daya diperlukan agar subsistem satelit dapat bekerja, maka pada proses desain satelit perlu dilakukan analisis dan estimasi ketersediaan daya selama satelit mengorbit dengan tetap mempertahankan kekompakan dan volume yang diberlakukan oleh standar. Penelitian ini bertujuan untuk mengetahui kondisi iluminasi matahari pada panel surya dari berbagai alternatif desain penempatan sehingga diperoleh sebuah desain yang efisien. Iluminasi maksimum sebuah panel surya triple junction yang terpasang secara body mounted pada satelit kurang lebih sebesar 60%. Berdasarkan hasil penelitian ini, kombinasi pemasangan 3 body mounted panel surya dan 2 simple deploy panel surya menghasilkan persentase iluminasi dua kali lipat dibandingkan 5 body mounted panel surya.Kata kunci: panel surya triple junction, iluminasi, body mounted, simple deploy, daya ABSTRACTSatellite design has envolved towards miniaturization to reduce launch costs. Small satellites provide a low-cost platform for space missions. One of the main problems with small satellites is the limited availability of power. Because the availability of power is needed so that the satellite subsystem can work, the satellite design process needs to analyze and estimated power availability as long as the satellite orbits while maintaining the compactness and volume imposed by the standard. This study aims to determine the conditions of solar illumination on solar panels from various alternative design placements in order to obtain an efficient design. Maximum illumination of triple junction solar panel mounted on a small satellite is approximately 60%. Based on the results of this study, the combination of installing 3 body mounted solar panels and 2 simple deploy solar panels produced twice the illumination percentage compared to 5 body mounted solar panels.Keywords: solar panel triple junction, illumination, body mounted, simple deploy, power
PERAN MAKANAN TERHADAP KEJADIAN KARIES GIGI Sri Ramayanti; Idral Purnakarya
Jurnal Kesehatan Masyarakat Andalas Vol 7 No 2 (2013): Jurnal Kesehatan Masyarakat Andalas
Publisher : Faculty of Public Health, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24893/jkma.v7i2.114

Abstract

Hasil Riset Kesehatan Dasar (Riskesdas) 2007 menunjukkan bahwa hampir separuh penduduk Indonesia mengalami karies gigi. Makanan kariogenik merupakan faktor penyebab utama terjadinya karies gigi bersamasama dengan faktor mikroorganisme, gigi (host) dan waktu. Karbohidrat adalah bahan yang sangat kariogenik. Gula yang terolah seperti glukosa dan terutama sekali sukrosa sangat efektif menimbulkan karies karena akan menyebabkan turunnya pH saliva dibawah 5.5 secara drastis dan akan memudahkan terjadinya demineralisasi. Gula sukrosa mempunyai kemampuan yang lebih efisien terhadap pertumbuhan mikroorganisme asidogenik dibanding jenis karbohidrat lain. Selain itu, defisiensi beberapa vitamin dan mineraljuga mendorong terjadinya karies pada gigi seperti defisiensi vitamin A, B, C, dan D,kalsium, fosfor fluor dan zinc. Oleh karena itu, tindakan pencegahan diperlukan melalui tahapan primer, sekunder dan tersier.
The Functions of Language Analysis on Oral Tradition Tangis in Karonese Ramayanti, Sri; Zainuddin, Zainuddin
TRANSFORM: Journal of English Language Teaching and Learning Vol. 11 No. 3 (2022): September, 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/tj.v11i3.44034

Abstract

This research deals with the analysis of language functions on oral tradition's Tangis in Karonese. The aim of this research is to: (a) describe how language functions are realized on oral tradition's Tangis in Karonese and (b) explain the reason why language functions are used on oral tradition's Tangis in Karonese. This research was conducted by using the descriptive qualitative method. The data of this research is taken from the utterances spoken by the pilgrims when did the Tangis. There are five language functions found in Tangis from the six language functions proposed by Roman Jakobson. They were referential 54,1%, conative 32,4%, emotive 8,1%, phatic 2,7 %, and poetic 2,7%. Besides the language functions found, there are also the reasons the language functions are used on oral tradition's Tangis in Karonese. They were thoughts, feelings, needs, and observation.
Response to The Use of Liquid Organic Fertilizer on Vegetative Growth in Soybean Plants Black (Glycine Soja L. Merrill) with Two Different Cultivars Ramayanti, Sri; Rahmadina, Rahmadina; Idami, Zahratul
Jurnal Biologi Tropis Vol. 24 No. 3 (2024): July - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v24i3.7512

Abstract

Soybean-based food business and population growth drive the increase in soybean consumption every year in Indonesia. Soybean varieties and liquid organic fertilizer applications can help overcome losses in soybean plant growth and productivity. This study used a randomized block design (RAK) with treatment consisting of 2 factors with 3 repetitions. Factor i liquid organic fertilizer (p), consists of 4 levels, namely: p0 = 0 ml, p1 = 20 ml, p2 = 40 ml, p3 = 60 ml. the 2nd factor cultivar (k), consists of 2 types, namely: k1 = cultivar detam 1, k2 = cultivar detam 3. The results showed that the response and effectiveness of the application of soybean peel poc and different cultivars did not significantly affect the vegetative growth of black soybean plants, but when viewed as a whole p3 (60 ml) gave the highest value on the parameters of leaf area index 21 hst, root nodules, chlorophyll a, and chlorophyll b content.
Individual dietary diversity score dan kejadian stunted pada anak prasekolah di Kota Padang Purnakarya, Idral; Ramayanti, Sri; Sari, Desy Purnama
Jurnal Gizi Klinik Indonesia Vol 21, No 1 (2024): Juli
Publisher : Minat S2 Gizi dan Kesehatan, Prodi S2 IKM, FK-KMK UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijcn.91361

Abstract

Individual dietary diversity score and stunted in preschool children in Padang Background: Stunting is a disorder of growth and development in children due to chronic malnutrition and recurrent infections, characterized by substandard length and height.Objective: The study assesses the relationship between individual dietary diversity scores and stunting in preschool children in Padang.Methods: The study used a cross-sectional design. The sample of this study was 267 preschool children aged 3-5 years in Padang who were taken by multi-stage random sampling. Data was collected through child height measurements and individual dietary diversity score (IDDS) for food grouping measured by a 24-hour dietary recall. The data was analyzed using the Chi-Square test.Results: The results showed that 9.7% of preschool children were stunted, and 41.6% of preschool children had lower dietary diversity. The results of the study found was not significantly relationship between individual dietary diversity score and the incidence of stunting in pre-school children in Padang (p-value>0.05).Conclusions: Preschool children with IDDS secure to have a lower risk of stunting. Through a comprehensive approach that prioritizes improving dietary diversity, it is expected to be a key strategy in efforts to reduce stunting in Padang City. 
Vehicles Speed in Platoon, Case Study Padang - Bukittinggi Road Ramayanti, Sri; Adji, Bayu Martanto; yosritzal, yosritzal; Gunawan, Hendra
Jurnal Rekayasa Sipil (JRS-Unand) Vol. 17 No. 1 (2021)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.17.1.97-107.2021

Abstract

The increase in vehicle ownership number will affect the increase in traffic flow, which will usually result in congestion on the road network. This phenomenon causes vehicles to tend to travel close to one another (platoon). Characteristics used in describing the platoon phenomenon are the distance between vehicles (headway), average speed, and the number of vehicles in the platoon. This study is to analyzes the effect of variations in the leader and platoon length on vehicle speed. This research was conducted on Padang – Bukittinggi Road. Based on the Decree of the Minister of PUPR No: 248/KPTS/M/2015, Padang - Bukittinggi Road is categorized as a primary arterial road. This research used the primary data, a field survey, by recording vehicle traffic flow (traffic platoon) for two days. A distance of 50 meters is taken to determine the speed, and the time is measured with a stop program. The average headway on weekdays is 1.32 seconds and on holidays is 1.47 seconds. The size of the platoon and the type of platoon leader have a significant effect on the average speed of the vehicle in the platoon if the headway is  ≤ 2 seconds. At the addition of one vehicle in the platoon, which can change the vehicle's average speed, follows the equation y = -4.30x + 67.09.
Preliminary Power Budget Analysis for Equatorial Low Earth Orbit (LEO) Communication Satellite Suryanti, Desti Ika; Ramayanti, Sri; Mukhayadi, Mohammad
Indonesian Journal of Aerospace Vol. 19 No. 1 (2021)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2021.v19.a3479

Abstract

Satellite Technology Center – LAPAN would develop a constellation of 9 communication satellites in a low equatorial orbit. These satellites would perform as data collection platforms for many sensors that spread across the Indonesian territory. The data from the sensors will be downlink to Indonesia’s ground stations in real-time. This research aims to analyze the power budget of those satellites to decide how many solar panels and batteries are required to perform their mission. The method in this research began by calculating the power requirements of each mission per orbit period to estimate power consumption and calculate the power generated by the solar panels. The results of these calculations will be implemented to the power system design to find the satellite solar cells/ panels arrangement and battery capacity allocation. To minimize the development time and cost, the solar array design in this study considers the utilization of previous solar panel design of LAPAN-A series satellites as a design constraint. This study shows the configuration of 3 body-mounted solar panels and 2 deployable solar panels could support the mission operation of communication satellite in the low equatorial orbit. For energy storage, these satellites should be equipped with 28 V Li-ion in the 8Sx3P configuration.
Co-Authors Bayu Martanto Adji, Bayu Martanto HENDRA GUNAWAN B11211055 Idral Purnakarya Mohammad Mukhayadi, Mohammad Rahmadina, Rahmadina SURYANTI, DESTI IKA Yosritzal, Yosritzal Zahratul Idami Zainuddin, Zainuddin