FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)最新文献

{"title":"FORMULASI SEDIAAN SERUM EKSTRAK ETANOL 96% DAUN TEKELAN (Chromolaena odorata (L) R.M. King & H. Rob) DAN UJI ANTIOKSIDAN [FORMULATION OF 96% ETHANOL EXTRACT SERUM PREPARATION OF TEKELAN LEAVES (Chromolaena odorata (L) R.M. King & H. Rob) AND ANTIOXIDANT TEST]","authors":"Andriyani Andriyani, Jessica Trisina, Grace Sani Naitasi, Sri Wahyu Ningsih Munthe","doi":"10.19166/jstfast.v7i2.6917","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.6917","url":null,"abstract":"Tekelan leaves are known to have antioxidant activity therefore they can be developed into cosmetic products. The objective of this study was to develop a serum formulation from tekelan leaves extract and antioxidant test. Tekelan leaves extract was prepared by maceration with 96% ethanol. The 96% ethanol extract of tekelan leaves extract was made into 3 formulations with a variety of emollient ingredients, namely squalene, dimethicone and almond oil. Evaluation carried out on serum preparations included organoleptic, homogeneity, pH, viscosity, specific gravity, adhesion and stability tests. The extract yield was 25.40%. Testing for phytochemical content showed that the extract contained alkaloids, flavanoids, phenols, tannins, saponins and steroids. Evaluation results of the three serum formulas meet physical quality test requirement such as organoleptic, homogenity, pH, specific weight and viscosity but did not meet the adhesion test requirements. In addition, all three serum formulas showed very weak antioxidant activity.","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"31 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139205659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENGOMPOSAN SAMPAH ORGANIK DAN ISOLASI BAKTERI TERMOFIL DARI KOMPOS [COMPOSTING ORGANIC WASTE AND ISOLATING THERMOPHILE BACTERIA FROM COMPOST]","authors":"Tjie Jan Tan, Juan Daniel, Hans Victor, Marcelia Sugata","doi":"10.19166/jstfast.v7i2.7596","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.7596","url":null,"abstract":"Composting is one of the methods to sustainably minimize the accumulation of waste in the environment. Compost is made through the decomposition process of organic waste with the help of microorganisms. The process of making compost goes through several phases, one of the most important phases is the thermophilic phase. In this research, an evaluation was carried out on the effect of temperature, humidity, pH and aeration on the success of composting from leaves and twigs and braches of trembesi tree (Albizia saman). In addition, isolation and identification of thermophilic bacteria which play an important role in the composting process were carried out. Isolation of thermophilic bacteria is carried out when the compost making process is in the thermophilic phase. To support the growth of thermophilic bacteria, incubation during the isolation and purification process was carried out at a temperature of as high as 55-60 o C. Subsequently, thermophilic bacterial isolates were identified based on morphology and biochemical activity tests. The characterization results based on Bergey's Manual Systematic Bacteriology Second Edition Volume Three the Firmicutes indicated that the isolates obtained belonged to the genus Bacillus.","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":" 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139207273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PEMBUATAN TAHU SUSU MENGGUNAKAN KOAGULAN DARI BONGGOL NANAS (Ananas comosus L.) [MANUFACTURING MILK TOFU USING COAGULANTS FROM PINEAPPLE HUMPS (Ananas comosus L.)]","authors":"Ryan Pratama, Ratna Handayani","doi":"10.19166/jstfast.v7i2.6064","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.6064","url":null,"abstract":"Bromelain enzyme is a protease enzyme that can coagulate casein in milk. The use of pineapple waste, namely pineapple humps, can be used as a coagulant in making milk tofu. This research aimed to determine the best bromelain enzymes from two types of pineapple humps based on protein content and enzyme activity, as well as to analyzed the effect of bromelain enzyme crude extract concentration as a coagulant in making tofu with different heating temperatures. In phase I of the research, crude extract of bromelain enzymes was isolated and analyzed by yield, protein content, and enzyme activity. In phase II, milk tofu was made using a crude enzyme extract concentration of 0.50%; 1,00%; and 1.50% with a clotting temperature of 60 oC and 80 oC which were then analyzed by yield, water content, fat content, ash content, protein content, color and texture. The results of phase I analysis showed that the best type of humps was Queen pineapple humps with protein content of 0.12 ± 0.007 µg/ml and activity of 76.27 ± 4.43 U/ml, subsequently the humps were used for phase II analysis. The best treatment from phase II research was a crude enzyme extract concentration of 1.0% and a clotting temperature of 80oC with a yield value of 24.27 ± 0.01%, a moisture content of 68.89 ± 3.30% and a protein content of 4.64 ± 0.008%. Bahasa Indonesia Abstract:Enzim bromelin merupakan enzim protease yang dapat menggumpalkan kasein pada susu. Penggunaan limbah nanas yaitu bonggol nanas dapat digunakan sebagai koagulan dalam pembuatan tahu susu. Penelitian ini bertujuan untuk menentukan ekstrak kasar enzim bromelin terbaik dari dua jenis bonggol nanas berdasarkan kadar protein dan aktivitas enzimnya, serta untuk menganalisis pengaruh konsentrasi ekstrak kasar enzim bromelin sebagai koagulan dalam pembuatan tahu dengan suhu pemanasan yang berbeda. Pada penelitian tahap I dilakukan ekstrak kasar enzim bromelin diisolasi dan dianalisis secara rendemen, kadar protein, dan aktivitas enzim. Pada tahap II dilakukan pembuatan tahu susu menggunakan konsentrasi ekstrak kasar enzim 0,50%; 1,00%; dan 1,50% dengan suhu penggumpalan 60 oC dan 80 oC yang selanjutnya dianalisis secara rendemen, kadar air, kadar lemak, kadar abu, kadar protein, warna dan tekstur. Hasil analisis tahap I menunjukkan bahwa jenis bonggol terbaik adalah bonggol nanas Queen dengan kadar protein 0,12 ± 0,007 µg/ml dan aktivitas 76,27 ± 4,43 U/ml, selanjutnya bonggol tersebut digunakan untuk analisis tahap II. Perlakuan terbaik dari penelitian tahap II adalah konsentrasi enzim 1,0% dengan suhu penggumpalan 80 oC dengan nilai rendemen 24,27 ± 0,01%, nilai kadar air 68,89 ± 3,30% dan nilai kadar protein 4,65 ± 0,008%.","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"144 35","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139197001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OPTIMASI DAN FORMULASI EKSTRAK ETANOL UMBI WORTEL (Daucus carota L.) SEBAGAI FACE SERUM SEBAGAI FACE SERUM [OPTIMIZATION AND FORMULATION OF CARROT ETHANOL EXTRACT (Daucus carota L.) AS A FACE SERUM]","authors":"Karnelasatri Karnelasatri, Jessica Trisina, Rossa Maranatha Purba","doi":"10.19166/jstfast.v7i2.7604","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.7604","url":null,"abstract":"Carrot bulbs are known to contain secondary metabolite compounds that can act as antibacterials due to their activity, which suppresses the synthesis of nucleic acid, cytoplasmic membrane function, and energy metabolism in bacteria. This research was carried out using laboratory experimental methods through the determination of the plant, production of simplicia, extraction by ethanol (96% as solvent) with the maceration method, phytochemical screening, antibacterial assay, optimization of the base formula, formulation of carrot extract, physical evaluation of the products, and hedonic testing. The yield of 96% ethanol extract of the carrot bulbs was 53.29%, and the water content of the extract was 16.14%. Furthermore, the antibacterial activity of the extract (500.000 ppm) against Staphylococcus aureus showed an inhibitory zone of 5.1 ± 3.42 mm. The carrot extract serum formulas F1, F2, and F3 meet the organoleptic and homogeneity criteria; however, the F2 formula does not meet the pH and viscosity criteria. Based on the hedonic statistical test, no significant difference was found in each formula; nevertheless, based on the average value of the respondents, it was known that the F1 formula had the highest preference.Bahasa Indonesia Abstract:Umbi wortel dapat berperan sebagai antibakteri karena mengandung senyawa metabolit sekunder yang dapat menekan sintesis asam nukleat, fungsi membran sitoplasma, dan metabolisme energi pada bakteri. Penelitian ini dilakukan dengan metode eksperimental laboratorium yang dilakukan dengan determinasi tumbuhan, pembuatan simplisia serta ekstraksi dengan pelarut etanol 96% dengan metode maserasi, skrining fitokimia, uji antibakteri ekstrak, optimasi basis sediaan, formulasi sediaan, evaluasi fisik sediaan, dan uji hedonik sediaan. Rendemen ekstrak etanol 96% umbi wortel yang diperoleh adalah sebesar 53,29% dan kadar air ekstrak adalah 16,14%. Aktivitas antibakteri dari ekstrak (500.000 ppm) terhadap Staphylococcus aureus menunjukan zona hambat sebesar 5,9 ± 0,49 mm. Sediaan serum ekstrak umbi wortel F1, F2, dan F3 memenuhi syarat organolepik dan homogenitas, namun sediaan F2 tidak memenuhi syarat pH dan viskositas sediaan. Berdasarkan uji statistik hedonik sediaan, tidak ditemukan perbedaan signifikan pada tiap sediaan, namun berdasarkan nilai rata-rata responden diketahui bahwa sedian F1 menjadi preferensi tertinggi.","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139201060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IMPLEMENTASI MACHINE LEARNING UNTUK MEMBUAT IMAGE SEARCH ENGINE BERDASARKAN ANALISIS SIMILARITAS [IMPLEMENTATION OF MACHINE LEARNING TO CREATE AN IMAGE SEARCH ENGINE BASED ON SIMILARITY ANALYSIS]","authors":"Austin Darian Pratama, Junita Junita","doi":"10.19166/jstfast.v7i2.7592","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.7592","url":null,"abstract":"The development of technology makes it easier to search for something on the internet. Based on data in 2022, there will be more than 1 billion Google users worldwide. This data proves the importance of search engines for internet users. However, in general, search engine searches use keywords. This research aimed to produce image search engines for searching. The image search engine utilizes a Convolutional Neural Network, namely VGG-16, which would compare the similarity of the input image to all images in the database by comparing the neurons in the image. Image search engine performance was measured based on the accuracy and sequence of image output. Accuracy was obtained with a weighting system from 5 search result images produced by the image search engine. Mobile phone applications were used to improve the quality of images used for searching. The application would capture images or take images through the gallery then upload them to Firebase and be used to search by image search engines. From the research conducted, it was found that changing the angle had the greatest impact on decreasing accuracy values when compared to 3 other factors: color, background and image quality. The decrease in accuracy due to the influence of angle, color, backround,, and image quality was 96.25%, 0%, 22.5%, and 68.75%, respectively. The images from cellphone application were proven to have higher accuracy (95.32% ) than the images captured with webcam (86.67%). The increase in accuracy emphasizes that the influence of image quality and the angle of the image used to search influences search results. The specifications of the cellphone camera are 64 Megapixels, while the webcam camera is 2 Megapixels","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"379 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139205012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RANCANG BANGUN ALAT UKUR ANTROPOMETRI DIGITAL DAN PORTABEL [DESIGN AND CONSTRUCTION OF DIGITAL AND PORTABLE ANTHROPOMETRIC MEASUREMENT TOOLS]","authors":"Nicholaus Matthew, Agustina Christiani, Christopher Nata","doi":"10.19166/jstfast.v7i2.7569","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.7569","url":null,"abstract":"<em>In the Work </em><em>System Design</em><em> Laboratory at </em><em>UPH</em><em>, there are anthropometric measuring </em><em>tools</em><em> for standing position and sitting position. Based on the</em><em> tools</em><em> evaluation, it was found that </em><em>they were</em><em> less efficient because </em><em>of the need for </em><em>repeated </em><em>tool </em><em>adjustments</em><em>. Furthermore, two observers were needed</em><em> </em><em>to collect</em><em> </em><em>anthropometric </em><em>data</em><em> and they had to read the scale manually</em><em>. Therefore, a new digital and portable anthropometric</em><em> measuring</em><em> tool was </em><em>developed to overcome the problem</em><em>. The Gea HT721 measuring instrument was chosen as an alternative to a new anthropometric</em><em> measuring</em><em> tool that uses ultrasonic ranging technology to measure distances. </em><em>A </em><em>supporting tool</em><em> (similar to a caliper)</em><em> </em><em>was also developed </em><em>to support the </em><em>anthropometric </em><em>measurement process. An evaluation of the new anthropometric</em><em> measuring</em><em> tool was carried out by calculating the average percent error</em><em> and</em><em> a comparison of the total time for data collection. The results of the average percent measurement error </em><em>was</em><em> 0.58%.</em><em> According to the paired t-test, t</em><em>here was no</em><em> significant</em><em> difference in the average of</em><em> measured </em><em>body dimensions using the new and </em><em>the previous</em><em> </em><em>tool</em><em>s</em><em>.</em><em> </em><em>The new anthropometric tools can reduce data collection time by 32% for standing positions and 11% for sitting positions</em><em>.</em><em></em><p align=\"justify\"><strong>Bahasa Indonesia Abstract:</strong></p><p align=\"justify\">Pada Laboratorium Analisis Perancangan Kerja (APK) di UPH terdapat alat ukur antropometri posisi berdiri dan posisi duduk. Berdasarkan evaluasi alat antropometri tersebut, ditemukan bahwa alat kurang efisien karena membutuhkan penyetelan alat yang berulang yang juga membutuhkan lebih dari satu pengamat saat pengambilan data. Selain itu, pengamat sering mengalami kesulitan pembacaan hasil pengukuran manual pada meteran. Oleh karena itu, dibuat alat antropometri jenis baru yang bersifat digital dan portabel. Alat ukur Gea HT721 dipilih sebagai alternatif alat antropometri baru yang menggunakan teknologi ultrasonic ranging untuk mengukur jarak. Setelah itu, dirancang dan dibuat suatu alat pendukung yang menyerupai jangka sorong untuk mendukung proses pengukuran data antropometri. Evaluasi alat antropometri baru dilakukan dengan menghitung rata – rata persen error, serta perbandingan total waktu pengambilan data. Hasil rata – rata persen error pengukuran adalah 0,58%. Hasil uji paired t test menunjukkan bahwa tidak terdapat perbedaan signifikan antara rata-rata hasil pengukuran dimensi tubuh menggunakan alat ukur antropometri je","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"126 48","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139197239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PEMODELAN FREKUENSI DAN SIMULASI GETARAN SENAR GITAR BASS LISTRIK DAN GITAR AKUSTIK [FREQUENCY MODELING AND VIBRATION SIMULATION OF ELECTRIC BASS AND ACOUSTIC GUITAR STRINGS]","authors":"Caroline Gunawan, Helena Margaretha, Lina Cahyadi, Petrus Widjaja","doi":"10.19166/jstfast.v7i2.7594","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.7594","url":null,"abstract":"Mathematical equations can represent numerous real-world scenarios, a process known as mathematical modelling. Within this paper, we undertake modelling two musical instruments, specifically the electric bass guitar and the acoustic guitar. Our approach uses partial differential equations (PDEs) to represent these instruments accurately. By establishing the initial condition, we derive the final solution and simulate the frequency using parameters obtained from this solution alongside a frequency formula. The PDE for the electric bass guitar is of non-homogeneous second order, while the PDE for the acoustic guitar is of homogeneous fourth order. The simulation outcomes demonstrate that a lower vibration frequency for the electric bass guitar corresponds to a decreased string density, given a fixed tension. Similarly, this correlation holds for the acoustic guitar. With fixed string tension and Young's Modulus, a lower string density leads to a higher frequency and reduced inertia. Additionally, we provide graphical representations of the analytical solutions for both PDEs.  Bahasa Indonesia Abstract:Persamaan matematika dapat memodelkan banyak situasi dalam dunia nyata. Proses ini disebut pemodelan matematika. Salah satu contoh yang dapat dimodelkan adalah frekuensi alat musik (gitar bass listrik dan gitar akustik). Kedua alat musik tersebut dimodelkan frekuensinya dengan persamaan diferensial parsial (PDP). Solusi akhir akan diperoleh berdasarkan kondisi awal. Simulasi frekuensi dilakukan berdasarkan parameter yang ditemukan dari solusi akhir dan rumus frekuensi. PDP untuk gitar bass listrik adalah orde dua non-homogen, dan PDP untuk gitar akustik adalah orde empat homogen. Hasil simulasi menunjukkan bahwa untuk gitar bass dengan tegangan tertentu, senar dengan densitas rendah menghasilkan frekuensi getaran yang lebih rendah. Hasil yang konsisten juga ditunjukkan untuk gitar akustik. Pada tegangan senar dan Modulus Young yang diberikan, senar dengan densitas rendah menghasilkan frekuensi yang lebih tinggi dan inersia yang lebih rendah. Beberapa grafik solusi analitik dari kedua PDP tersebut juga ditampilkan dalam artikel ini.","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PEMANFAATAN SEMANGKA DAN OKRA DALAM PEMBUATAN JELI STIK DENGAN VARIASI JENIS HIDROKOLOID [USE OF WATERMELON AND OKRA IN MAKING JELLY STICKS WITH VARIOUS TYPES OF HYDROCOLLOIDS]","authors":"Nathania Putri Alfian, T. S. Mastuti","doi":"10.19166/jstfast.v7i2.7601","DOIUrl":"https://doi.org/10.19166/jstfast.v7i2.7601","url":null,"abstract":"Jelly is food product in semi-solid form derived from fruit or vegetable juices with the addition of gelling agent. Jelly sticks are easy to eat, carry around and loved by the public. In this research, watermelon and okra were used as jelly’s ingredients because these two ingredients have many health benefits The use of watermelon can also mask the unpleasant aroma and taste of okra. The type of hydrocolloid as gelling agent is an important factor in making jelly stick because it can influence the texture of jelly. The aim of this research was to determine the organoleptic, physic and chemical characteristics of the best jelly stick based on selected ratio of watermelon:okra and type of gelling agent. The treatment factors of jelly included ratio of water melon and okra (60:40, 50:50, 40:60) and the types of gelling agent (carrageenan, carrageenan:konjac, carrageenan:pectin). The best jelly stick was jelly made from a ratio of watermelon and okra 60:40 with a carrageenan:konjac as gelling agent. This jelly had the closest texture to jelly stick commercial with springiness of 0,95 ± 0,01 and cohesiveness of 0,70 ± 0,02. It had °Hue value 22,34 ± 0,97 as a red color, chewy texture, slightly preferred color and neutral overall preference from the panelist. The best jelly stick also had IC50 value of 82226,96 ± 6297,9 ppm, total phenolics of 0,157 ± 0,01 mg GAE/ml, total flavonoids of 0,022 ± 000 mg QE /ml and food fiber content 2,885g/100g.Bahasa Indonesia Abstract:Jeli merupakan produk pangan dalam bentuk semi padat yang berasal dari sari buah atau sayur dengan penambahan bahan pembentuk gel. Jeli stik mudah untuk dikonsumsi, dibawa bepergian serta banyak disukai masyarakat. Pada penelitian ini digunakan semangka dan okra sebagai bahan baku karena kedua bahan ini memiliki banyak manfaat kesehatan. Penggunaan buah semangka juga dapat menutupi aroma dan rasa khas okra yang kurang disukai. Jenis hidrokoloid sebagai gelling agent merupakan faktor penting dalam pembuatan jeli karena mempengaruhi teksturnya. Tujuan penelitian ini adalah menentukan karakteristik organoleptik, fisik, kimia jeli stik terbaik berdasarkan rasio semangka:okra dan jenis gelling agent terpilih. Faktor perlakuan pada jeli adalah rasio semangka dan okra (60:40, 50:50, 40:60) serta jenis gelling agent (karagenan, karagenan:konjak, dan karagenan:pektin). Jeli stik terbaik adalah jeli dengan rasio semangka dan okra 60:40 dengan jenis gelling agent karagenan:konjak. Jeli ini memiliki tekstur paling mendekati jeli stik komersial dengan springiness sebesaar 0,95 ± 0,01 dan cohesiveness sebesar 0,70 ± 0,02. Jeli ini memiliki nilai °Hue sebesar 22,34 ± 0,97 sebagai warna merah, tekstur kenyal, warna yang agak disukai dan kesukaan keseluruhan yang netral dari panelis. Jeli stik terbaik juga memiliki nilai IC50 sebesar 82226,96 ± 6297,9 ppm, total fenolik sebesar 0,157 ± 0,01 mg GAE/ml, total flavonoid sebesar 0,022 ± 000 mg QE /ml dan kadar serat pangan 2,885g/100g.","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALISIS SISTEM PENDETEKSI TAHAPAN TIDUR [SLEEP STAGE DETECTION SYSTEM ANALYSIS]","authors":"Junita Junita","doi":"10.19166/jstfast.v7i1.6702","DOIUrl":"https://doi.org/10.19166/jstfast.v7i1.6702","url":null,"abstract":" The COVID-19 pandemic has forced some parents to work at home while taking care of their children and taking care of household chores without the help of relatives, housemaids, or nurses. The demands of doing many jobs at once can result in parents, especially parents with babies, being careless in supervising their babies. One of the moments that make parents careless in supervising their babies is when parents suspect the baby is sleeping, because at that moment parents are usually busy doing other chores. With a system that can detect baby's sleep activity, especially detecting stage one, also called NREM (non-rapid eye movement) stage 1, where a person is almost awake, this risk can be minimized because parents can know when the baby is about to wake up and supervise before the baby is fully awake. This study analyzes the ability of two devices, namely, EEG (electroencephalogram) and a smart watch with a sleep tracker feature, as tools for detecting sleep activity of the research subject, specifically detecting stage 1 of the subject’s sleep cycle. In this study, CCTV was also used to find out when the subject was awake. The results of this study indicate that both tools can detect when the subject is awake. Between the two tools used, there was a higher match between CCTV (Closed Circuit Television) footage and the smart watch sleep cycle diagram. For the analysis of the transfer of stages before the subject awakens, the stage that most often becomes the stage before awakening is Light, which is 69.2% for detection with EEG and 76.1% for detection with smart watch. And what rarely happens is moving the sleep stages from Deep to waking up, which is 0% for detection with EEG and 2.3% for detection with smart watch.Bahasa Indonesia Abstract:Pandemi COVID-19 mengharuskan beberapa orang tua bekerja di rumah sambil menjaga anak dan mengurus pekerjaan rumah tangga tanpa bantuan sanak saudara, pembantu rumah tangga, ataupun suster. Tuntutan mengerjakan banyak pekerjaan sekaligus dapat mengakibatkan orang tua, khususnya orang tua dengan bayi, lengah dalam mengawasi bayinya. Salah satu momen yang membuat orang tua lengah dalam mengawasi bayinya adalah ketika orang tua menduga bayinya sedang tidur, karena di momen itu biasanya orang tua paling leluasa untuk mengerjakan pekerjaan yang lain. Dengan sistem yang dapat mendeteksi aktivitas tidur bayi, terutama mendeteksi tahap satu, yang disebut juga dengan NREM (non-rapid eye movement) stage 1, dimana seseorang sudah hampir bangun, risiko tersebut dapat diminimalkan karena orang tua dapat mengetahui ketika bayinya sudah akan terbangun dan mengawasi sebelum bayinya sepenuhnya bangun. Penelitian ini menganalisa kemampuan dua buah alat yaitu, EEG (electroencephalogram) dan smart watch dengan fitur sleep tracker, sebagai alat pendeteksi aktivitas tidur dari subjek penelitian, khususnya mendeteksi tahap 1 dari siklus tidur pada subjek penelitian. Pada penelitian ini digunakan juga CCTV (Closed Circuit Televisi","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129330674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENGEMBANGAN SISTEM INFORMASI BERBASIS WEB BAGI BANK SAMPAH DI TANGERANG SELATAN [DEVELOPMENT OF A WEB-BASED INFORMATION SYSTEM FOR WASTE BANKS IN SOUTH TANGERANG]","authors":"P. C. Rahayu, Verel Salomo Ulyano Simatupang, A. Christiani","doi":"10.19166/jstfast.v7i1.6711","DOIUrl":"https://doi.org/10.19166/jstfast.v7i1.6711","url":null,"abstract":"To support the government's program in achieving a zero waste target, the information system used by waste collectors, waste bank managers, or individuals needs to be developed. The academic community has supported the government program by designing an information system. However, the system requires sustainable maintenance and development to meet user needs. SampahQu is a mobile application used for depositing Tetra Pak packaging waste in South Tangerang. However, the application cannot be used due to lack of maintenance. The purpose of this research is to develop an information system based on the framework of the previous application, but expanded to deposit 48 other types of waste. The development method used is the System Development Life Cycle (SDLC) Prototype, which consists of planning, analysis, design, implementation, and testing stages. In the planning stage, the business process, user needs, and system development feasibility analysis are obtained. The results of the analysis stage consist of use case diagrams, activity diagrams, class diagrams, and normalized relational tables. The application will be used by waste collectors, waste bank managers, and personal customers, so login is required for access suitability: registration, waste bank data update, transaction input, viewing historical data, and reporting. The results of the design and implementation stage were successfully tested with users using the Delone and McLean success measurement method, with a score of 4.8 out of 5.Bahasa Indonesai Abstract:Untuk mendukung program pemerintah mencapai target bersih sampah, diperlukan pengembangan sistem informasi yang dapat digunakan oleh pengepul, pengurus bank sampah atau personal. Pihak akademisi telah mendukung program pemerintah melalui perancangan sistem informasi. Namun diperlukan adanya pemeliharaan dan pengembangan yang berkelanjutan dari sistem tersebut agar dapat memenuhi kebutuhan pengguna. Aplikasi SampahQu merupakan aplikasi mobile yang digunakan untuk menyetor sampah kemasan Tetra Pak di Tangerang Selatan. Namun karena belum ada pemeliharan, aplikasi tersebut tidak dapat digunakan lagi. Tujuan penelitian ini adalah mengembangkan sistem informasi berdasarkan kerangka kerja aplikasi sebelumnya, namun diperluas untuk penyetoran 48 jenis sampah lainnya. Metode pengembangan yang digunakan adalah metode Daur Hidup Pengembangan Sistem atau System Development Life Cycle (SDLC) Prototype, yang terdiri dari tahap perencanaan, analisis, pembuatan, implementasi dan testing. Pada tahap perencanaan diperoleh proses bisnis, kebutuhan pengguna dan analisis kelayakan pengembangan sistem. Hasil dari tahap analisis terdiri dari use case diagram, activity diagram, class diagram dan tabel relational ternormalisasi. Aplikasi akan digunakan oleh pengepul, pengurus bank sampah dan nasabah personal maka login diperlukan untuk kesesuaian akses: register, update data bank sampah, input transaksi, melihat data histori, dan pelaporan. Hasil dari taha","PeriodicalId":375381,"journal":{"name":"FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology)","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116056109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}