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INDONESIA
FaST : Jurnal Sains dan Teknologi
Published by Universitas Pelita Harapan
ISSN : -     EISSN : 25989596     DOI : -
Core Subject : Science, Social,
Computer Science & IT Environmental Science
Started in 2017, FaST publishes articles in the areas of science and technology, particularly in food technology, biology, electrical engineering, industrial engineering, mathematics and civil engineering. Articles are either reviews and/or research results.
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 1, No 1 (2017): November" : 6 Documents clear
Prediksi Lendutan Akibat Bond Slip Pada Dinding Beton Bertulang [Prediction of Deflection Due to Bond Slip on Reinforced Concrete Walls] Ika Bali; Sadikin Sadikin
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol 1, No 1 (2017): November
Publisher : Universitas Pelita Harapan

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Abstract

Deflection occurs on reinforced concrete wall when it reaches the ultimate strength can be contributed by the deflection due to bending, shear and bond slip. The bond slip occurs when the loss of bond between concrete and steel reinforcement, causing the stress distribution becomes disturbed. This generates an additional deflection on the walls of reinforced concrete. This analysis study was conducted to predict the additional deflection due to the bond slip on reinforced concrete walls that were subjected to lateral load at the ultimate strength condition of the walls. The deflection due to bond slip at the ultimate strength condition of the walls is estimated by the strength-of-material concept. The wall ultimate strength is determined as the minimum of flexural and shear strengths that based on a strength-of-material concept, and the shear strength and the Softened strut-and-tie model, respectively. The specimens of reinforced concrete walls used in this study are the reinforced concrete walls with a single curvature that available in the literature. The results of this study indicated that the deflection due to bond slip provides the additional deflection average of 5.5% of the total deflection due to bending and shear as the wall reaches the ultimate strength. This study shows that the effect of deflection due to bond slip is smaller than the deflection due to shear and bending.BAHASA INDONESIA ABSTRAK: Lendutan terjadi pada dinding beton bertulang saat mencapai kekuatan batas dapat dikontribusikan oleh lendutan akibat lentur, geser dan bond slip. Bond slip terjadi ketika hilangnya ikatan antara beton dan baja tulangan, menyebabkan distribusi tegangan menjadi terganggu. Hal ini menghasilkan lendutan tambahan pada dinding beton bertulang. Studi analisis ini dilakukan untuk memprediksi lendutan tambahan akibat bond slip pada dinding beton bertulang yang mengalami beban lateral pada kondisi kekuatan batas dinding. Lendutan akibat bond slip pada kondisi kekuatan batas dinding diestimasi dengan konsep kekuatan material. Kekuatan batas dinding ditentukan berdasarkan minimum dari kekuatan lentur dan geser yang berturut-turut didasarkan pada konsep kekuatan material dan model Softened strut-and-tie. Spesimen dari dinding beton bertulang yang digunakan dalam penelitian ini adalah dinding beton bertulang dengan kelengkungan tunggal yang tersedia dalam literatur. Hasil penelitian ini menunjukkan bahwa lendutan akibat bond slip memberikan rata-rata lendutan tambahan 5,5% dari total lendutan akibat lentur dan geser saat dinding mencapai kekuatan batas. Studi ini menunjukkan bahwa pengaruh lendutan akibat bond slip lebih kecil dari pada lendutan akibat geser dan lentur.
EFEK PEMBERIAN TEMULAWAK TERHADAP BERAT BADAN DAN SISTEM IMUN MENCIT BALB/c Jap Lucy; Lulu Florencia; Elvina Elvina; Dina Stefani; Agustina Ika Susanti
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol 1, No 1 (2017): November
Publisher : Universitas Pelita Harapan

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ABSTRACT.   Curcuma (Curcuma xanthorrihiza) is a well-known Indonesian traditional medicine. It is believed to be beneficial for health. Curcuma xanthorrihiza contain curcuminoid, starch and essential oil. This herb is widely used as a traditional medicine that is packaged in the form of powders, drinks and tablets. Curcuma xanthorrihiza tablet used in the study was separated by Thin Layer Chromatography (TLC) which exhibit the compound's content to be similar to pure curcuma. This study was followed by feeding BALB/c mice with curcuma tablet on different doses (100 mg / kg body weight (BW), 200 mg / kg, and 400 mg / kg and water as a control. The effect of various doses of Curcuma xanthorrihiza on weight gain and immune response was determined. Treatment was given to BALB/c mice for 20 days on different doses and weighed once a week. Observation of body weight of mice for four weeks showed that administration of Curcuma xanthorrihiza did not affect weight gain significantly (p < 0,05). Phagocytosis test and hemagglutination test (HA) were conducted, exhibiting both pro and anti-inflammatory actions.Keywords : adaptive, curcuma xanthorrihiza, hemagglutination, innate, phagocytosis
PEMANFAATAN PATI BIJI DURIAN (Durio zibethinus L.) SEBAGAI EDIBLE COATING DALAM MEMPERTAHANKAN MUTU ANGGUR MERAH (Vitis vinifera L.) Melanie Cornelia; Rika Tandoko
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol 1, No 1 (2017): November
Publisher : Universitas Pelita Harapan

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ABSTRACT.   Red grape fruit (Vitis vinifera L.) was one of non-climacteric fruit that easily damaged. Changes that occurred in damaged grape was becoming wrinkle and wither, browning, and fruit flesh softening. Durian seed was one of food waste that contains high enough starch so it could be used as a basic ingredient for making edible coating. The objectives of this research were to make edible film from durian seed starch with different concentration of durian seed starch (2%, 4%, 6%, 8%, and 10%) and glycerol 3% addition.  Edible films' physical and mechanical characteristics such as tensile strength, elongation, and water vapor transmission rate were analyzed.  The best edible film will be used for coating of red grapes. Finally, doing analyzing the effect of edible coating towards quality of red grapes that were stored at room and refrigeration temperature. Physical and chemical characteristic of red grapes such as skin puncture, weight loss, pH, total titratable acid, and total dissolved solid were analyzed during storage. The results showed that edible film with the higher concentration of durian seed starch had higher tensile strength, elongation, and thickness, but had lower water vapor transmission rate. The best edible film was an edible film with 6% durian seed starch and 3% glycerol. The results also showed that application of the edible coating on red grapes could maintain the quality of grape during storage, prolonged the shelf life up to 18 days at room temperature and up to 30 days at refrigeration temperature.Keywords: durian seed, edible coating, physicochemical quality, red grape, shelf life
DETEKSI AGLUTINASI SECARA OTOMATIS UNTUK UJI GOLONGAN DARAH TIPE ABO BERBASIS KERTAS Juli Handono; Sastra Kusuma Wijaya; Anwar Soefi Ibrahim
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol 1, No 1 (2017): November
Publisher : Universitas Pelita Harapan

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ABSTRACT.  The research is the early study of development of automatic detection for  the paper-based agglutination devices as a determinant of ABO blood typing, namely the integration of the blood type test equipment based on paper chromatography and forward grouping method with agglutination detection through image processing. Paper test was made by Whatman No. 4 filter paper with three hydrophilic columns, the paper test pattern were printed by using laser printers and cutting process to make hydrophobic field, paper test printed were placed in waterproof cases that was printed with a 3D printer. Reagents anti-A, anti-B and Anti-D (rhesus) were immobilized on each hydrophilic columns. By measurement of optimization paper strips obtained the value of optimization volume of reagents immobilized and optimization of blood volume test, each 6 µl Anti-A, Anti-B and Anti-D were immobilized on hydrophilic columns and 40 µl amount of blood sample needed for testing. The preliminary study was produced image processing software for blood agglutination detection with Absolute Subtract Difference (ASD) method, it was designed to support single-board computer Raspberry Pi and mini camera for decision result of blood type on the display. The test results get a high accuracy by comparing the results with slide test method.
Alat Peraga Kendali Pemanas Udara Berbasis Arduino Uno Sebagai Penunjang Praktikum Laboratorium Kendali Politeknik Negeri Semarang [A Demonstration Tool of Arduino Based Air Heater Controller to Support Control Laboratory of Politeknik Negeri Semarang] Bambang Supriyo; Samuel Beta Kuntardjo; Sihono Sihono
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol 1, No 1 (2017): November
Publisher : Universitas Pelita Harapan

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The objective of this research is to develop and test the demonstration tool of Arduino based air heater controller with Proportional Integral Derivative (PID) based control methods for the temperature range between 50ºC and 70ºC.   Arduino Uno was programmed using C-language to do control tasks and to transfer control data serially to computer via USB port. The selection of the initial PID  parameters are determined using the combination of Relay Feedback method and Ziegler-Nichols  formula.  The control methods were focused on proportional (P), proportional derivative (PD) dan Proportional Integral Derivative (PID) with the performance criteria based on overshoot  dan steady state error.  The experimental results show that the PID controllers give best output responses in terms of zero steady state errors, while P and PD controllers still result in steady state errors of about 3ºC. In addition, P controllers still give about 2,5ºC-4ºC fluctuative output values below set points, while the PD and PID have very small fluctuative values and even very close to zero. This laboratory demonstration tool has shown very good PID based controller performance, so it is feasible to be used as a supporting demonstration tool for control system laboratory in Politeknik Negeri Semarang or even other universities.
KARAKTERISASI NUGGET PINDANG IKAN-AMPAS TAHU YANG DITAMBAH TEPUNG TULANG IKAN SEBAGAI SUMBER KALSIUM Hardoko Hardoko; Eddy Suprayitno; Titik Dwi Sulistiyati; Alfin Adam Arifin
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol 1, No 1 (2017): November
Publisher : Universitas Pelita Harapan

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ABSTRACT.  The bones of the boiled fish contain high calcium that can be used for osteoporosis therapy, but less utilized in food products. This study was aimed to study the characteristics of boiled fish nugget mixed with okara as filler and added fish bone flour as a source of calcium. The method used was experimental method which was divided into 2 stages, namely the addition of okara 20, 30, 40% and the addition of fish  bone flour of 60, 80, 100 mesh with concentration of 10, 20 ,30%. The results showed that the addition of okara could increase the water content of the nuggets, but has not yet affected the texture of the boiled fish nugget. In general, boiled fish nugget which had the highest panelists’ acceptance was the one that was added with 30% okara. The addition of fish bone flour tends to decrease water content and increases the texture of hardness boiled fish nugget -okara. The addition of fish bone flour to boiled fish nugget that had the highest panelists’ acceptance was fish bone flour of 10% with size of 100 mesh. The boiled fish nugget -okara contains 5.8 mg/g of calcium and 5.11% dietary fiber.Keyword : boiled fish nuggets, fish bone flour, okara

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