JST (Jurnal Sains dan Teknologi)

The Effect of Electric Field on Charcoal Conductivity in Supercapacitor Applications: Tectona Grandis Carbon and NaCl Electrolyte

Melani Dyah Ayu Sukma — 2025-01-10

One of the biggest challenges in the application of renewable energy is efficient and sustainable energy storage. In this case, supercapacitors can be a solution as an efficient and sustainable energy storage. This study aims to determine how the relationship between activated carbon charcoal with NaCl as an electrolyte solution, as well as the potential generated by using variations in the concentration of electrolyte solution as much as 1 M, 2M, and 3 M. Characterisation tests conducted in this study include PSA (Particle Size Analyze) test to determine the particle size contained in wood charcoal activated carbon and XRD (X-Ray Difraction) to determine the composition of the material in wood charcoal activated carbon. The results showed that based on the PSA and XRD characteristics test, wood charcoal activated carbon has a particle arrangement measuring 327 nm which is suitable for supercapacitor applications and has an amorphous shape which is also a form of carbon suitable for supercapacitor applications, based on experimental results there is a relationship between wood charcoal activated carbon and NaCl as an electrolyte solution, and the potential associated with the output value of voltage, output value of electric current, and output value of capacitance produced by supercapacitors.

Rancang Bangun Presensi Automatis Pendeteksi Wajah Menggunakan Webcam Berbasis IOT

Ebiet Wanda Lestari — 2024-10-25

Presensi menjadi faktor penting karena terkadang disalahgunakan oleh mahasiswa untuk memanipulasi kehadiran. Penelitian ini bertujuan merancang dan mengembangkan sistem presensi otomatis berbasis Internet of Things (IoT) dengan teknologi deteksi wajah menggunakan webcam, serta menguji efektivitas sistem yang dihasilkan. Metode penelitian yang diterapkan adalah metode campuran dengan melibatkan 20 partisipan sebagai subjek penelitian, terdiri dari 10 orang yang diuji di dalam ruangan dan 10 orang di luar ruangan. Sistem ini melibatkan pengembangan perangkat lunak berupa bot Telegram, situs web, dan aplikasi berbasis Python. Data training citra wajah dikumpulkan dan disimpan dalam basis data sebagai acuan pengenalan untuk proses validasi presensi. Pengumpulan data dilakukan secara langsung di depan webcam pada jarak yang telah ditentukan; setelah wajah dikenali, data kehadiran akan diteruskan ke bot Telegram dan secara otomatis tercatat pada situs web. Efektivitas sistem dievaluasi berdasarkan akurasi pendeteksian wajah dan kecepatan presensi otomatis. Hasil pengujian menunjukkan bahwa, pada tingkat pencocokan 75%, dengan kondisi pencahayaan luar ruangan dan jarak pengenalan antara 20 hingga 70 cm, sistem mampu mencapai akurasi 100% dengan waktu deteksi rata-rata 61 detik untuk 10 orang. Sistem ini menawarkan keunggulan praktis dalam mendeteksi kecurangan presensi serta efisien dari segi waktu dan biaya. Penelitian ini menunjukkan bahwa sistem presensi otomatis berbasis deteksi wajah menggunakan webcam dan teknologi Internet of Things (IoT) berhasil dirancang dan dibangun dengan baik. Implikasi dari penelitian ini adalah penerapan sistem presensi otomatis berbasis deteksi wajah dan IoT dapat meningkatkan efisiensi dan akurasi dalam proses absensi, mengurangi potensi kesalahan manusia, serta meningkatkan keamanan dengan memverifikasi identitas pengguna secara otomatis.

Rekayasa Pengembangan Knowledge Base dalam Mengkonversi Mobil Konvensional menjadi Mobil Listrik

Cokorda Prapti Mahandari — 1024-10-25

Peralihan dari mobil konvensional berbahan bakar fosil ke mobil listrik merupakan salah satu langkah penting dalam mengurangi emisi gas rumah kaca dan mencapai target keberlanjutan global. Namun, biaya tinggi untuk membeli mobil listrik baru menjadi kendala utama bagi banyak individu dan organisasi. Penelitian ini bertujuan untuk mengembangkan sebuah sistem knowledge base berbasis forward chaining yang dapat mendukung proses konversi mobil konvensional menjadi mobil listrik. Sistem ini dirancang dalam bentuk platform web untuk memudahkan pengguna dalam mengakses panduan konversi, sekaligus mendukung inisiatif global mencapai emisi nol bersih. Menggunakan pendekatan berbasis aturan (rule-based), sistem ini menyediakan rekomendasi mengenai komponen yang perlu diganti berdasarkan spesifikasi mobil pengguna, seperti bobot, kapasitas mesin, dan jenis transmisi. Metode pengembangan melibatkan tacit knowledge dari pakar di bidang konversi kendaraan dan memanfaatkan teknologi HTML, CSS, JavaScript, PHP, dan MySQL untuk antarmuka dan basis data. Pengujian sistem dilakukan menggunakan black box testing yang menunjukkan keberhasilan sistem dalam menyediakan hasil yang akurat. Hasil penelitian diharapkan dapat mempercepat adopsi kendaraan listrik dan memberikan kontribusi terhadap pengurangan emisi karbon global. Kesimpulan dari penelitian ini menunjukkan bahwa pengembangan knowledge base untuk mendukung proses konversi mobil konvensional menjadi mobil listrik merupakan langkah strategis untuk mempercepat adopsi teknologi kendaraan listrik. Implikasi dari penelitian ini mencakup kontribusi praktis dan strategis dalam mendukung transisi menuju transportasi berkelanjutan. Dengan adanya knowledge base yang dikembangkan, teknisi dan pemilik kendaraan memiliki akses yang lebih mudah terhadap informasi teknis dan prosedur konversi mobil konvensional menjadi mobil listrik.

The Effect of Battery Settings and Fan Parameters on the Performance of the Lithium-Ion Battery Thermal Management System in a Circular Configuration

Muhammad Luthfi — 2024-10-25

This study examines the performance of a thermal management system for 18650 lithium-ion batteries using a circular placement configuration and a forward-curved fan. Experiments were conducted with variations in fan speed, the number of fan blades, and battery positioning (aligned or zigzag) to observe their effects on temperature and temperature distribution during the battery discharge process. The results showed that increasing fan speed significantly reduced battery temperature to around 30-33°C and improved temperature distribution uniformity with a standard deviation ranging from 0.5 to 1.21°C. Meanwhile, variations in the number of fan blades and battery positioning had an insignificant impact on temperature reduction but did influence temperature distribution uniformity, with the lowest standard deviation of 0.5-0.6°C observed in the three-blade variation. The zigzag positioning provided a more uniform temperature distribution compared to the aligned positioning, with a standard deviation of 0.51-0.97°C

Development Aplication Student Attendance Application For Class X Using Qr Code To Improve Student Order

Achmad Buchori — 2024-10-25

Utilizing online attendance applications and Android-based QR codes is one method that can be applied to overcome these problems and contribute to a good attendance process and easy summarization. The purpose of this research is to produce a feasible and practical attendance application using QR codes. This research is included in Research and Development (RnD) research using the MDLC (Multimedia Life Circle) model. The data collection methods used are interviews, observations and questionnaires with instruments in the form of questionnaire sheets. The data analysis method used is descriptive and quantitative. The study results show that the QR Code Attendance Application simplifies attendance, minimizes manual errors, and increases efficiency. Hence, the QR Code Attendance Application is feasible and influential in applying to student attendance. This research implies the need for schools to switch to digital technology to improve administrative efficiency. Implementing this application also opens up opportunities for integrating attendance data with other systems, such as the assessment system or student attendance reports.

Pemberi Pakan Ikan Otomatis berbasis IoT dengan FLC Berdasarkan Kualitas Air (Suhu, PH, Kekeruhan)

Elsanda Merita Indrawati — 2024-10-25

Pemberian pakan ikan secara konsisten dengan jumlah yang sama tanpa melihat kondisi lingkungan dan kebutuhan ikan dapat menyebabkan pakan tidak termakan, mengendap didasar kolam dan meracuni ikan. Tujuan pada penelitian ini yaitu menciptakan alat pemberi pakan ikan otomatis berbasis IoT dengan Fuzzy Logic Controller yang akurat dalam menentukan jumlah pakan berdasarkan kualitas air kolam. Jenis penelitian ini yaitu Research and Deveopment (RnD). Pada penelitian ini parameter inputan yaitu berupa suhu, ph, tingkat kejernihan dan outputan yaitu berupa banyaknya putaran motor yang dapat menentukan jumlah pakan sehingga menghasilkan 27 aturan fuzzy. Metode pengumpulan data yaitu berupa wawancara dan observasi kepada petani ikan gurami, sedangkan instrumen yang digunakan adalah lembar wawancara dan observasi. Setelah data dikumpulkan kemudian dianalisis mengguanakan metode analisis statistik deskriptif. Hasil penelitian menunjukkan eknologi pemberi pakan ikan efektif untuk digunakan. Sehingga dapat disimpulkan bahwa, pengembangan alat pemberi pakan ikan otomatis berbasis IoT dengan Fuzzy Logic Controller (FLC) mampu memberikan hasil yang akurat dalam menentukan jumlah pakan berdasarkan kualitas air kolam (suhu, ph, dan turbidity) yang mana jam pemberian pakan dilakukan secara real time meanggunakan RTC. Adanya alat ini petani diharapkan mampu memberikan pakan lebih efektif dan efisien dalam jumlah dan waktu pemberian pakan.

Heavy Metal Toxicity of Pb in the Organs of Nile Tilapia (Oreochromis Niloticus) in the Watershed Due to Hospital Waste

Nindha Ayu Berlianti Nindha — 2024-10-25

The toxicity levels of heavy metals accumulated in water and sediment due to hospital waste discharge not only impact the environment but also pose a significant threat to human health. Long-term accumulation of these metals in the body may lead to degenerative diseases such as cancer. This concern highlights the urgency of conducting laboratory-based experimental research to identify the distribution of heavy metals in aquatic environments caused by hospital waste. The study employs Nile tilapia (Oreochromis Niloticus) as a bioindicator, a species capable of absorbing metals through its tissues. The research subjects consisted of 35 Nile tilapia with a body length of 8–12 cm and a weight of 12–15 grams, alongside hospital waste samples collected from three discharge points. Data collection methods included sample preparation of both hospital waste and Nile tilapia, treatment with varying concentrations of lead nitrate (Pb(NO3)2), and maintenance durations of 7, 14, 21, and 28 days. The concentration of Pb in the gills and muscle tissue of the fish was measured using Atomic Absorption Spectroscopy (AAS). The analytical data, represented as heavy metal concentrations, were plotted on a graph showing the relationship between concentration variations and maintenance durations and analyzed using One-Way ANOVA with nonparametric Tukey's test. The analysis revealed that the highest Pb concentration was observed in the gills of Nile tilapia on day 28 at 1.57 ppm, while the Pb concentration in muscle tissue reached 0.25 ppm on day 21. According to BPOM standards, Pb levels in Nile tilapia muscle tissue remain within the safe consumption threshold (≤0.3 ppm), whereas Pb levels in the gills exceeded the tolerance limit. This study provides scientific evidence on the risks of heavy metal accumulation in aquatic biota due to hospital waste and underscores the importance of improved waste management practices to safeguard public health and the environment.

Aphrodisiac Effects of Ethanolic Extract from White Ginger Rhizome (Zingiber officinale Rosc. var. officinarum) on Male Wistar Rats

Swastika Oktavia — 2024-10-25

Erectile dysfunction (ED) is a common condition marked by difficulty maintaining a penile erection, often linked to reduced nitric oxide (NO) production. This study investigates the aphrodisiac properties of ethanolic white ginger extract (Z. officinale Rosc. var. officinarum) in male Wistar rats. Sixteen male and sixteen female rats were divided into four groups: two groups received 25% and 50% ginger extract, one served as a negative control, and the other as a positive control using sildenafil. Ginger rhizomes were dried, powdered, and extracted with ethanol. Phytochemical analysis revealed alkaloids, flavonoids, tannins, saponins, and terpenoids. Behavioral parameters, including introduction (approach to females), climbing, and coitus, were observed to evaluate sexual activity. The group treated with 50% ginger extract showed the highest frequency of introduction and climbing, while the sildenafil group exhibited the highest coitus frequency. Statistical analysis using the Kruskal-Wallis test indicated significant differences in sexual behavior across the groups. The study suggests that white ginger extract, especially at higher concentrations, may have aphrodisiac effects by enhancing sexual behavior in male rats. This could be due to its bioactive compounds affecting hormone levels or the nervous system. The findings propose white ginger as a potential natural treatment for ED, with further research required to explore its implications in humans.

Penambahan Compatibilizer pada Polymer Blend dari Limbah Masker Sekali Pakai dan Polypropylene Daur Ulang terhadap Sifat Mekanik Material

Anwar Ibrahim — 2024-10-25

Pandemi COVID-19 meningkatkan limbah masker sekali pakai secara signifikan, menghasilkan mikroplastik yang sulit terurai dan berbahaya bagi lingkungan. Masalah ini mendorong penelitian untuk mengembangkan solusi berbasis daur ulang menggunakan polymer blend dengan penambahan compatibilizer untuk meningkatkan sifat mekanis. Penelitian ini bertujuan menganalisis efek compatibilizer Maleic Anhydride Grafted Polypropylene (MAPP) pada polymer blend berbahan polypropylene limbah masker sekali pakai. Penelitian ini merupakan eksperimen dengan desain kuantitatif. Subjek penelitian terdiri dari spesimen polymer blend dengan variasi komposisi limbah masker (70-100%), polypropylene daur ulang (30%), dan compatibilizer MAPP (0-3%). Sebanyak 5 spesimen diuji untuk masing-masing variasi menggunakan standar ASTM D638 untuk uji tarik dan ASTM D256 untuk uji impak. Data dikumpulkan melalui pengujian mekanik dan dianalisis menggunakan statistik deskriptif dan inferensial. Hasil penelitian menunjukkan bahwa penambahan compatibilizer meningkatkan sifat tarik dan impak polymer blend secara signifikan dibandingkan dengan campuran tanpa compatibilizer. Simpulan penelitian ini menunjukkan bahwa polymer blend berbasis limbah masker dengan compatibilizer MAPP dapat menjadi alternatif material ramah lingkungan dengan sifat mekanik yang lebih baik, berpotensi sebagai produk hijau bernilai komersial. Implikasinya, metode ini mendukung pengelolaan limbah plastik berkelanjutan dan ekonomi sirkular.

Potensi Cuka Salak Sibetan sebagai Disinfektan pada Alat Penatah Gigi Sangging dalam Upacara Potong Gigi “Metatah”

Ni Nyoman Widiari — 2024-10-25

Sterilisasi alat tatah dalam upacara Metatah masih menggunakan desinfektan kimia yang berpotensi menimbulkan efek samping bagi kesehatan dan lingkungan. Alternatif desinfektan alami berbasis bahan lokal seperti cuka salak Sibetan belum banyak diteliti, khususnya dalam konteks ini. Penelitian ini bertujuan untuk menganalisis efektivitas cuka salak Sibetan sebagai desinfektan alami dengan mengevaluasi kandungan fitokimia, aktivitas antioksidan, dan kemampuan antimikroba terhadap alat tatah. Penelitian menggunakan desain eksperimen laboratorium dengan pendekatan kuantitatif. Subjek penelitian melibatkan cuka salak konsentrasi 2% yang diuji pada empat alat tatah dan sampel kontrol menggunakan akuades dan alkohol 70%. Data dikumpulkan melalui uji total fenol, flavonoid, tanin, aktivitas antioksidan menggunakan DPPH, serta analisis Angka Lempeng Total (ALT) mikroorganisme pada alat tatah. Data dianalisis menggunakan metode statistik deskriptif dan inferensial. Hasil penelitian menunjukkan cuka salak memiliki efektivitas tinggi sebagai desinfektan alami. Kandungan fenol, flavonoid, dan tanin yang tinggi memungkinkan cuka salak secara signifikan mengurangi mikroorganisme hingga tingkat yang sebanding dengan alkohol 70%. Kesimpulan penelitian menegaskan bahwa cuka salak dapat menjadi alternatif desinfektan alami yang efektif dan aman, menjawab permasalahan kesehatan pada upacara Metatah. Penelitian ini mendukung pengembangan desinfektan berbasis bahan alami lokal yang ramah lingkungan dan berpotensi mendukung keberlanjutan praktik budaya sekaligus memperkuat nilai ekonomi lokal.

Investigasi Flexural Properties Hasil Cetak 3D Printer Berbahan Carbon Fiber Polylactic Acid untuk Pembuatan Telapak Kaki Palsu

The Jaya Suteja — 2024-10-25

Telapak kaki palsu jenis Energy-storing-and-returning dan Bionic harus mempunyai kekuatan dan kekakuan tertentu. Material Polylactic Acid yang diperkuat dengan serat karbon (CF-PLA) dapat digunakan untuk meningkatkan kekuatan dari foot yang dibuat dengan 3D printing. Parameter proses dari 3D printing juga bisa digunakan untuk mendapatkan kekuatan tertentu dari foot. Tujuan dari penelitian ini adalah untuk menyelidiki pengaruh parameter 3D printing yaitu infill density, shell thickness, dan temperatur ekstruder terhadap rasio kekuatan tekuk dibanding massa, modulus kekakuan tekuk, dan regangan tekuk dari hasil cetakan berbahan CF-PLA serta memberi rekomendasi nilai parameter yang optimal. Rancangan eksperimen yang digunakan mengikuti metode Taguchi Grey Relational Analysis dengan tiga level dan dua kali replikasi. Spesimen uji tekuk berdasarkan standar ISO 178 digunakan sebagai obyek penelitian ini. Dari hasil penelitian dapat disimpulkan bahwa parameter infill density dan shell thickness adalah parameter yang berpengaruh. Penelitian ini berkontribusi memberikan wawasan bahwa material CF-PLA berpotensi digunakan untuk membuat telapak kaki palsu dengan proses 3D printing. Untuk mendapatkan nilai rasio kekuatan tekuk dan massa, modulus elastisitas tekuk, dan regangan tekuk yang maksimum, nilai yang direkomendasikan untuk infill density adalah sebesar 40%, shell thickness adalah sebesar 1,2 mm, dan temperatur ekstruder adalah sebesar 210 °C.

A Polyphasic Approach to the Exploration of Lactic Acid Bacteria from Tempoyak in South Sumatra

Siti Soleha — 2025-01-03

The polyphasic approach is a comprehensive method for classifying bacterial isolates into specific. It combines morphological and biochemical data with molecular details, such as 16S rRNA gene sequencing. This study aims to identify LAB (Lactic Acid Bacteria) species found in tempoyak from South Sumatra. The identification process includes examining colony morphology, cell morphology, physiology biochemistry, and analyzing the 16S rRNA gene of LAB. The physiological and biochemical characteristics of LAB were observed through test such as oxygen requirement, motility, indole, catalase, MR-VP, citrate, urea, and sugar fermentation. The Morphological, biochemical and physiological characteristics were compared to those in Bergey's Manual of Determinative Bacteriology. The 16S rRNA gene was amplified using universal primers 27F (5' AGA GTT TGA TCM TGG CTC AG 3') and 1492R (5' TAC GGY TAC CTT GTT ACG ACT T 3'). DNA sequences in FASTA format were compared to NCBI DNA database using BLAST software. A Phylogenetic tree was reconstructed using the Maximum likelihood method in MEGA X with a bootstrap of 1000. This study successfully isolated three LAB, coded as TP02, TP07 and TP08. TP02 was identified as Lactobacillus sp, YIT 11469, TP07 as Lentilactobacilus kefiri strain NBRC 15888 and TP08 as Lentilactobacillus buchneri strain JCM 1115. TP02 and TP08 showed strain level similarity with identity percentages of 99.93% and 99.60%, respectively.

Analysis of responses to the development of e-modules to improve students' critical thinking skills in reaction rate materials in the form of android applications

Aulia Sanova — 2024-12-25

Students' critical thinking skills in chemistry learning are generally still low, so interesting teaching materials are needed to improve students' critical thinking skills, one of which is the e-module. This study aims to determine the feasibility of the e-module and to determine the response of educators and students to the android application-based e-module in improving students' critical thinking skills on the material of reaction rate. The method used in this study is the research and development (R&D) method. The sample used was 15 students. The research instruments used were validation questionnaires for material experts and media experts, assessment questionnaires for educators and student response questionnaires. Data analysis techniques used are quantitative and qualitative. Based on the research results it is known that the product in the form of an e-module on the reaction rate material is suitable for use in learning. The results of the analysis of student responses also showed high student interest in the developed e-module.

IoT-Based Catfish Farm Monitoring with ESP32 Microcontroller and DS18B20 Sensor

Fidya Eka prahesti — 2024-12-25

Water quality and temperature are important parameters that need attention in fish farming. Inappropriate water quality and temperature parameters can inhibit fish growth, and can even cause death in fish so that farmers experience economic losses for the farm. Especially in the catfish breeding phase. Monitoring water quality in catfish farming ponds is mostly done manually using a timer. This monitoring is considered less efficient because the parameter to be solved is temperature, not time. The purpose of this study is to design a water quality monitoring system in catfish ponds based on the Internet of things by paying attention and regulating temperature in realtime. The quality of the pool water can be seen through the website with an update time span of 10 seconds. The results of the study showed that the monitioring and control system in catfish ponds succeeded by keeping the pond temperature between the lower and upper limits of temperature, which is around 28 ° C to 32 ° C.

The Investigation of Mercury in an Abandoned Artisanal and Small-Scale Gold Mining (ASGM) – Case Study in Kulon Progo, Indonesia

Mochamad Rifat Noor — 2024-12-25

Merkuri pada pertambangan emas skala kecil dan tradisional (PESK) merupakan masalah lingkungan dan kesehatan yang besar. Karena keberadaan merkuri di lingkungan bersifat persisten, pemetaan dan investigasi merkuri di area PESK yang telah ditinggalkan menjadi sangat penting untuk memitigasi dan meminimalisir pencemaran merkuri. Penelitian ini dilakukan untuk memetakan dan mengeksplorasi keberadaan merkuri di area PESK yang telah ditinggalkan di Desa Kalirejo, Kabupaten Kulon Progo, Yogyakarta. Hasil eksplorasi lapangan menunjukkan bahwa PESK yang ditinggalkan berada di daerah tepi sungai, dekat dengan pemukiman penduduk, dikelilingi oleh lahan pertanian dan perkebunan. Analisis merkuri dengan menggunakan metode dekomposisi termal menunjukkan bahwa empat dari lima sampel sedimen mengandung Hg di atas 0,3 mg/kg, yang mengindikasikan bahwa sedimen di empat titik pengambilan sampel telah terkontaminasi. Analisis merkuri menggunakan spektrometri ICP OES menunjukkan bahwa tiga dari enam sampel air permukaan mengandung Hg di atas 0,005 mg/L, yang mengindikasikan bahwa Hg telah mencemari air permukaan di tiga titik pengambilan sampel. Karena lokasi PESK yang ditinggalkan dekat dengan pemukiman penduduk, tepi sungai, dan dikelilingi oleh lahan pertanian dan perkebunan masyarakat, maka penduduk dapat terpapar merkuri.

Differences in Type Diversity and Abundance of Microplastics in Three Tributaries of the Brantas River, Surabaya

Muhammad Dheo Refaldo Wahyudi — 2025-01-01

Every year plastic production continues to increase along with increasing demand for plastic use, which can affect the amount of plastic waste that pollutes the environment, one of which is in waters. Plastic waste that enters rivers and is decomposed will turn into microplastics. Microplastics can pose a danger to human health and their activities. The aim of this research is to determine the diversity of types and abundance of microplastics in three tributaries of the Brantas River, Surabaya City. This research used a purposive sampling method on 3 tributaries of the Brantas River and carried out 3 repetitions. This research was conducted in October 2023 – March 2024. Water samples were taken using a plankton net with a size of 200 μm. The research results found 4 types of microplastics, namely fragments, filaments, fibers and pellets. The type of microplastic with the highest average is fragments. The colors of the microplastics found included black, transparent and brown. The highest total average abundance of microplastics was found in the Kalimas River and the lowest in the Jagir River.

Connecting Connecting Local Wisdom and Social Media: Innovative Strategies in Building Economic Sustainability and Overcoming Unemployment

Nurhalimah Harahap — 2025-01-06

The mismatch between the skills possessed by job seekers and the needs of the labor market causes unemployment. Based on this, this study aims to explore innovative strategies that connect local wisdom with social media to build economic sustainability and overcome unemployment. A mixed-method approach was used in this study. The three elements of local wisdom that are the focus of this study are Paloh Naga Agrotourism, Selayar Denai, and Pasar Kamu. The number of respondents was determined by as many as 30 people selected using the purposive sampling technique. The data collection method used questionnaires, interviews, and observations. The data collection instrument used a questionnaire sheet. The data analysis technique used qualitative and quantitative descriptive analysis. The study results showed that using social media, such as Instagram and Facebook, significantly increased the visibility and tourist visits to the agrotourism location. Social media is an effective promotional tool that introduces local uniqueness and opens up new jobs for the local community, both Generation Z and millennials. Combining local wisdom and digital strategies, this village has succeeded in increasing economic resilience by sustainably utilizing local natural and cultural potential. It is concluded that the synergy between local wisdom and social media supports economic growth in Kampoeng Lama Tourism Village and contributes to overcoming unemployment. This study's recommendation is to strengthen local communities' digital capacity and further develop elements of local wisdom to create a more integrated and inclusive tourism ecosystem.

Evaluasi Jumlah Cluster pada Algoritma K-Means++ Menggunakan Silhouette dan Elbow dengan Validasi Nilai DBI dalam Mengelompokkan Gizi Balita

Muhammad Raqib Syahkur — 2025-01-01

The nutritional status of toddlers is a crucial indicator in determining the quality of public health. Dietary imbalances in toddlers can lead to serious health issues, such as stunting and an increased risk of chronic diseases later in life. Therefore, clustering toddler nutrition data is essential for analyzing and determining appropriate interventions. This study aims to develop a method for clustering toddler nutrition data using the K-Means++ algorithm, which can evaluate initial centroids more accurately than the classic K-Means algorithm. Additionally, it evaluates the most optimal number of clusters using the Silhouette and Elbow methods and validates the clustering results using the Davies-Bouldin Index (DBI). The analysis results show that the Silhouette method produces the best number of clusters at K=2, with an average Silhouette value approaching 1. Meanwhile, the Elbow method identifies the elbow point at K=5, indicating that the optimal number of clusters is at that point. Validation using DBI shows that the DBI value for the Silhouette method with K=2 is 0.682471249, while the DBI value for the Elbow method with K=5 is 1.238458579. The lower DBI value at K=2 indicates that this clustering has strong internal cohesion and clear separation between clusters, thus K=2, obtained through the Silhouette method, is chosen as the optimal clustering result.

The Effect Of Drying Duration On The Physicochemical Characteristics Of Beetroot (Beta vulgaris L.) Sheet Jam

Safinta Nurindra Rahmadhia — 2024-12-30

The sheet jam from beetroot is a modification of spreadable jam and a diversification of food based on beetroot. Drying is one of the factors that determines the characteristics of the sheet jam. The objective of this study is to determine the effect of drying duration on the physicochemical characteristics of beetroot sheet jam. The drying process was conducted at a temperature of 50 °C with varying drying times of 10, 12, and 14 hours. The analyses performed in this study included texture tests (Hardness, Cohesiveness, Adhesiveness, Gumminess, and Chewiness), pH, moisture content, and antioxidant activity, with three repetitions for each test. The results showed that for the texture parameter, Hardness ranged from 12.66 to 17.65 N, Cohesiveness from 291.76 to 581.04 N, Adhesiveness from 7.35 to 33.58 Nmm, Gumminess from 5198.15 to 7973.70 N, Chewiness from 5117.80 to 7151.6 N, pH ranged from 3.93 to 5, moisture content from 18.85% to 24.95%, and antioxidant activity (IC50) ranged from 38.81 to 47.82 ppm. The conclusion of this study is that drying significantly affects the physicochemical characteristics of beetroot sheet jam.

Infestasi Pinjal, Kutu dan caplak Ektoparasit pada Kucing Kampung (Felis catus Linnaeus, 1758) di Kecamatan Saketi, Kabupaten Pandeglang, Banten

nurullah asep abdilah — 2024-12-25

Ectoparasites infesting domestic cats (Felis catus Linn.) cause health problems in cats and even act as direct causes or vectors of zoonosis. The purpose of this study was to study the types, intensity of attacks and prevalence of ectoparasite fleas, ticks and lice on F. catus in Saketi sub-district, Pandeglang district. Sorting, collection of slide preparations, identification to determine the value and category of attack intensity and prevalence of 560 ectoparasites taken by purposive sampling from 28 F. catus individuals in 14 villages. The results of the study found 3 types of ectoparasites including Felicola subrostratus (fleas), Ctenocephalides felis (fleas) and Ixodes ricinus (ticks). C. felis fleas have the highest attack intensity and prevalence, respectively 17.1 individuals/host and 100%. C. felis infestation has the potential to cause zoonosis.