Journal of Science and Application Technology (JSAT - Institut Teknologi Sumatera)
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MATHEMATICS MODEL SIRS-SI OF TRANSMISSION DENGUE VIRUS CONSIDERING FUMIGATION, VACCINATION AND TREATMEN IN CASE OF TANGERANG CITY
No full textAbstract: In this paper, we construct a mathematical model SIRS-SI transmission dengue fever considering fumigation, vaccination and treatment in case Tangerang City. Background why this research has to do because in Tangerang City the case of dengue fever is pretty lot. Method in this research is using compartment model and create differential equation system. We also do some analyze the model like determining free disease equilibrium point and endemic equilibrium point. We also determining basic reproduction number and making analyze stability of the model around equilibrium points. We also do simulation of the model and the result; model is local asymptotic stable in area free disease equilibrium point and local asymptotic stable in area endemic equilibrium point. Because R0 <1 for free disease equilibrium point, then there are no endemic disease, but because R0 > 1 for endemic equilibrium point then situation is in endemic dengue fever.
Keywords: SIRS, Fumigation, Vaccination, Treatment, Dengue
 
Implementasi Konsep Smart Environment pada Ruang Terbuka Hijau di Bukit Pelangi, Kota Sangatta
Full text linkBukit Pelangi Green Open Space has excellent potential to implement the concept of a smart city, especially in applying smart environmental dimensions with a focus on using technology to improve environmental quality, resource management efficiency, and public services. This study aims to determine the application of a smart environment in green open spaces in Bukit Pelangi, Sangatta City. This study uses a deductive approach with qualitative research methods. The data collection methodology includes literature studies, field observations, and stakeholder interviews on implementing a smart environment. This study uses a case study in Bukit Pelangi because the area is currently developing an integrated green open space with smart environmental technology. The study results show that Bukit Pelangi Park has tried to implement the concept of a smart environment. The application of this smart environment has met the suitability of the indicators of the availability and contribution of green open spaces, parks with WiFi facilities, the use of CCTV, and the existence of a waste bank. Indicators still less appropriate are the existence of an automatic watering system and an electricity network. Meanwhile, indicators that are not yet appropriate or face challenges include using solar panels and applying a zero-waste lifestyle
IMPACT OF TITANIUM DIOXIDE CONCENTRATION ON WHITECAST FORMATION IN DAY CREAM FORMULATION
Full text linkTitanium dioxide (TiO₂) is widely used in day cream formulations as a physical UV filter due to its broad-spectrum protection and stabilizing properties. However, its tendency to produce a visible whitecast on the skin presents a major aesthetic drawback, particularly for consumers with medium to dark skin tones. This study aimed to formulate three variants of day cream containing different concentrations of TiO₂ (6%, 3.3%, and 2%) and evaluate their visual characteristics, pH compatibility, and consumer-perceived whitecast intensity to determine the optimal balance between UV protection and cosmetic elegance. All formulations were prepared following a standardized emulsification protocol using identical excipient compositions, with TiO₂ concentration as the only variable. Organoleptic and pH evaluations were conducted, followed by a sensory assessment involving 20 respondents who evaluated whitecast visibility and overall preference using structured questionnaires. All formulations demonstrated desirable visual and organoleptic characteristics, including homogeneous white color, soft mango fragrance, and smooth texture with a pH within the ideal physiological range (4.5–5.5). Sensory evaluation revealed that higher TiO₂ concentrations led to more pronounced whitecast. Formulation F3 (2% TiO₂) was most preferred by 75% of respondents for its minimal whitecast and natural finish. The results indicate a direct correlation between TiO₂ concentration and whitecast intensity. While higher TiO₂ concentrations improve opacity and UV protection, they compromise cosmetic acceptability. Formulation with 2% TiO₂ offers an optimal balance for daily cosmetic use, supporting the development of aesthetically pleasing and functionally protective skincare products
Karakteristik Permukiman Kumuh di Kawasan Pesisir Kota Bandar Lampung
Full text linkUrban growth often leads to various issues, one of which is slum problems. This study identifies the characteristics of slum settlements in the coastal area of Bandar Lampung City, with the aim of understanding the physical and non-physical conditions that influence slum development. The slum settlements in the coastal area emerged due to geographic, social, economic factors, and non-compliance with regulations, making them vulnerable to natural disasters. The method used is qualitative descriptive, with data collection through observation and questionnaires. The results indicate that the slum settlements are divided into two types: those located on land and those standing above the sea. The infrastructure conditions in these slum areas are very poor, including irregular building structures, non-compliance with technical standards, and deficiencies in waste water management, garbage collection, and fire protection. The socio-economic aspects of the community also show low levels of welfare, with the majority of the population working in the informal sector. This research is expected to contribute to the formulation of strategies for addressing slum settlements in the coastal area of Bandar Lampung
Analisis Potensi Pengembangan Sentra Industri Kreatif Di Surakarta: Studi Kasus Kelurahan Serengan
Full text linkA creative city aims to improve community welfare by nurturing local creative clusters. Surakarta is a creative city that developed by establishing creative clusters in the form of creative villages. It is widely known for its batik idustry. While most of its clusters focus on batik industries, Serengan Subdistrict has an alternative creative cluster potential that specifically produces blangkon and shuttlecock. This study employs a qualitative descriptive method to examine the potential of non-batik creative cluster in Serengan Subdistrict. Our analysis is guided by the three dimensions of creative potential: creative economy, creative milieu, and creative class. Data and information were collected from documentary reviews, observations, and interviews. The data were subsequently processed using a descriptive qualitative research method. The study findings emphasies the strong potential of Serengan to be promoted as a strategic creative cluster that produces alternative products amidst the domination of batik industries in Surakarta, which is expected to improve the well-being of the local community. However, among the three components of a creative city, the creative class and the creative milieu’s development remain underdeveloped. Collaborative processes and participatory activites are still infrequent, and there are no dedicated spaces that facilitate these interaction
Bacterial Contamination of Medical Scissors and Clamps in the Blood Collection Room
Full text linkBackground: Bacterial contamination in blood products can originate from the donor's body or the surrounding environment. Contamination may occur during the blood collection process. Transmission typically happens through the hands and body of the medical personnel, contaminated clothing, medical instruments, and the surrounding environment. Bacterial contamination is a highly influential parameter in indoor air populations, especially in healthcare environments. Objective: The objective of this study was to identify the presence and growth of bacteria on medical scissors and clamps in the blood collection room of the Indonesian Red Cross Sleman Regency. Method: This research employed a descriptive observational method to analyze bacterial growth on scissors and clamps collected from the blood collection room of Indonesian Red Cross Sleman Regency. A cross-sectional approach was used, in which data on potential risk factors were collected at a single point in time. Nutrient Agar (NA) was used as the culture medium in this study. Result: The results of the bacterial isolation indicated that the scissors and clamps in the blood collection room of the Indonesian Red Cross Sleman Regency can be considered sterile, as the number of bacterial colonies did not exceed the normal threshold of <30 colonies. Specifically, 2 bacterial colonies were found on the scissors and 2 on the clamps. Conclusion: The presence of only 2 colonies each on the scissors and clamps suggests that the instruments in the blood collection room of Indonesian Red Cross Sleman Regency are within acceptable sterilization standards. 
MAPPING SKINIMALISM NARRATIVES ON INSTAGRAM HASHTAG POSTS
Full text linkSkinimalism has gained visibility as a beauty trend promoting fewer products, fewer routine steps, and deliberate essentials. This study maps how skinimalism is narrated in Instagram hashtag posts using qualitative netnographic observation and descriptive content analysis. Forty caption entries were purposively sampled from the #skinimalism feed; after removing near-duplicates, 36 unique captions were analyzed. Captions were predominantly in English (63.9%), followed by Indonesian (25.0%) and other languages (11.1%), with #skinimalism appearing explicitly in 80.6% of captions. Dominant narrative categories comprised trend definition or education (30.6%), product promotion (27.8%), and routine guidance (22.2%). Nonexclusive thematic coding revealed routine simplification as the most prevalent element (66.7%), followed by natural look aesthetics (33.3%), while multifunctionality or hybrid product framing was relatively limited (11.1%). Actor cues were identifiable in many posts, including brands or commercial accounts (22.2%), creators or educators (19.4%), clinics or experts (11.1%), and individual users (8.3%), although 38.9% could not be clearly classified. Engagement assessed from visible comment excerpts (n = 40) indicated limited discourse, with half of the posts showing no comments and the remainder dominated by emotive or transactional responses. This limited engagement does not necessarily signal weak consumer interest but reflects Instagram’s role in stabilizing trend narratives through curated, authored content. Overall, the hashtag feed functions as a structured narrative field that reinforces skinimalism through procedural templates and marketing-aligned messaging rather than extended peer deliberation
Identifikasi Perambatan Gelombang Kelvin pada Fluktuasi Parameter Atmosfer di Wilayah Padang, Jakarta dan Pontianak Menggunakan Data Radiosonde dan GNSS-RO
Full text linkAnalisis pergerakan gelombang Kelvin pada fluktuasi parameter atmosfer dilakukan dengan memanfaatkan data pengamatan vertikal atmosfer dari radiosonde dan GNSS-RO. Metode filtering dengan penerapan Fast Fourier Transform (FFT) digunakan untuk mengidentifikasi arah dan fluktuasi perambatan gelombang temperatur di lapisan troposfer atas hingga stratosfer bawah. Hasil plot deret waktu parameter atmosfer menunjukkan bahwa fluktuasi temperatur dan komponen angin zonal memiliki perambatan yang identik dengan gelombang Kelvin. Perambatan temperatur dan angin zonal berpropagasi ke arah timur dengan skala waktu 7-10 harian serta 10-20 harian. Temperatur berfluktuasi dengan interval nilai –4 sampai 4 K untuk data radiosonde dan –3 hingga 3 K untuk data GNSS-RO. Fluktuasi komponen angin zonal berkisar pada rentang –30 hingga 10 m.s-1
Regional Validation Coastal Sea Level Anomaly Estimation from Altimetry Satellite and Tide Gauges Data using Fuzzy Inference System: A Case Study Around Natuna Seas
Full text linkThe validation of waveform retracking analyses with Fuzzy Inferences system, which was previously developed to optimize the estimation of sea surface height (SSHs), particularly in coastal locations, is presented in this study. The fuzzy inference system has been tested and validated in the Natuna Sea, Indonesia, where altimetry waveforms varied based on water conditions. Validation was performed by comparing the waveform retracking result of Jason-3 data with in-situ tide gauge data and geoid. The validation of waveform retracking data for sea level anomaly (SLA) estimate against tidal data demonstrates that the waveform retracking with a fuzzy inference system is more accurate than previous approaches. Waveform retracking with fuzzy inference system is able to produce an average temporal correlation of 0.75-0.89 and RMSE between 0.15-0.17 m. The waveform retracking combined with a fuzzy inference system can improve SLA estimation accuracy in nearshore up to 4 km from the coastline. The results indicate that retracking with fuzzy inference system has the potential to be used in other complicated oceans
Pemberdayaan Komunitas dalam Ekowisata di Pulau Kecil: Kajian Literatur Sistematis Bibliometrik-Analisis Konten (2014-2024)
Full text linkSmall islands possess significant potential as ecotourism destinations; however, they also face various limitations, including restricted land area, inadequate infrastructure, and isolation from other regions. These conditions often lead to resource exploitation by certain parties without considering sustainability. Therefore, the role and capacity of human resources (HR) are crucial, supported by collaboration among the government, stakeholders, and local communities to ensure sustainable management. This study analyzes community empowerment on small islands through a Systematic Literature Review (SLR) and bibliometric analysis to identify key themes and research gaps. The study also evaluates the extent to which this aspect has been discussed in previous research and reveals existing gaps. The literature analyzed includes publications from the past ten years (2014-2024), sourced from the Publish or Perish (PoP) database. The findings indicate that although community empowerment has been widely discussed in the literature, studies specifically focusing on the context of small islands remain limited. Several aspects, such as the impact of climate change and political dynamics in community-based ecotourism management, have not been extensively examined and represent research gaps that warrant further exploration in future studies. Findings highlight the need for further studies on climate change impacts and governance in community-based ecotourism