Journal of Research and Technology <p>Journal of Research and Technology (JRT) was published since 2015. JRT contains of selected articles from the results of researches or study of literatures which are relevant to industrial, chemical, and environment engineering. Target readers of JRT are scientists, academics, and practitioners from various fields of industry. JRT has been indexed by: <em>Indonesian Scientific Journal Database; Google Scholar; Scholarsteer; Scientific Indexing Services: Directory of Open Access Journals (DOAJ); Bielefeld Academic Search Engine (BASE).</em></p> <p><strong>P-ISSN: 2460- 5972 | E-ISSN: 2477-6165</strong></p> en-US (Muchammad Tamyiz S.Si., M.Si) (Laily Noer Hamidah) Fri, 03 Jul 2020 00:00:00 +0700 OJS 60 PENGENDALIAN PENYAKIT KARAT PURU PADA BIBIT SENGON (Falcataria moluccana) DENGAN PRIMING BENIH DAN FUNGISIDA NABATI DAUN MINDI (Melia azedarach) <p>Production of sengon continuously improved to meet the needs of the timber industry, but increased production sengon still face the problem of that disease gall rust fungus <em>Uromycladiumtepperianum Sacc</em>. that is causing inhibited growth of sengon, so it needs to be eco-friendly controlled by spraying fungicide from mindi leaves which contains active ingredient <em>azadirachtin</em>&nbsp;and <em>margocyn</em> as antimicroorganisms. The research was conducted by using Factorial Completely Randomized Design with 2 factors and 3 replications. Priming factors (A) consisted of A<sub>0</sub>&nbsp;(control), A<sub>1</sub>&nbsp;(immersion), and A<sub>2</sub>&nbsp;(humidification). Fungicide factors (B) consisted of B<sub>0</sub>&nbsp;(control), B<sub>1</sub>&nbsp;(100 grams of Mindi&nbsp;leaves / 2L water), B<sub>2</sub>&nbsp;(150 grams of mindi leaves/2L water), B<sub>3</sub>&nbsp;(200 grams of mindi leaves/2L of water), and B<sub>4</sub>&nbsp;(250 grams of mindi leaves/2L water). Fungicide was given every 7 days after inoculation with 7 times of applications. The results of the research proved that the treatment A<sub>2</sub>B<sub>3</sub>&nbsp;(priming with humidification and fungicides 200 grams of mindi leaves/2L of water) was an effective treatment in reducing the intensity of gall rust disease on sengon with 8,36% of intensity.</p> Fiona Azzahro, Tri Saptari Haryani, Yulianti Bramasto Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PEMBUATAN ADSORBEN BERBAHAN BAKU TANAH LIAT DARI LIMBAH INDUSTRI PENCUCIAN PASIR SILIKA DENGAN PERBEDAAN KONSENTRASI HCl DAN WAKTU AKTIVASI <p>Clay is silicate frame-based mineral praticle with a diameter of less than 4 micrometers, clay contains fine fused silica and aluminium. The development of clay as an alternative adsorbent is very possible because the clay has a large surface area, high porosity, and high abundance in nature and also relatively inexpensive compared to other adsorbents. The purpose of this study was to determine the ratio of SiO₂/Al₂O₃ content in activated clay. Clay was activated by using hydrochloric acid (HCl) with variable time and concentration of Hydrochloric Acid. Variable concentrations of hydrochloric acid used were 1N, 2N, 3N, 4N, 5N 1000 ml and time variables were 1 hour, 1.5 hours, 2 hours, 2.5 hours, and 3 hours. The best ratio results were shown at 5 N hydrochloric acid (HCl) concentration with 3 hours activation time of 12,26%.</p> Laurentius Urip Widodo, Safinatun Najah, Cahya Istiqomah Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PILOT PLANT PROSES PRODUKSI BIODIESEL MENGGUNAKAN KATALIS BASA HOMOGEN <p>Methyl ester is an alkyl ester compound which is produced through an transesterification process between triglycerides and methanol with the aid of alkaline catalysts into alkyl esters and glycerol. Methyl ester is produced through a transesterification reaction. The method used in the production of methyl ester was Pilot Plant with batch process. Base catalyst variations were carried out at 0,1%w/w;0,3%w/w;0,5%w/w;0,7%w/w; dan 0,9%w/w. The productions of methyl ester consisted of pre-treatment, transesterification reaction, and post-treatment. Quality test of methyl ester consists of density and kinematic viscosity. Based on the result of the research, the overall quality of methyl ester were appropriate according to the Indonesian National Standard on Biodiesel. The highest density value was 889,6kg/m<sup>3</sup> at 0,5%w/w base catalyst concentration and the lowest value was 862,7kg/m<sup>3</sup> at 0,3%w/w base catalyst concentration. The highest value of kinematic viscosity contained in base catalyst variation of 0.1%w/w was at 5.80cSt and the lowest value of 0.7%w/w was at 3,76cSt.</p> Rif’ah Amalia, Hendrik Elvian Gayuh Prasetya, Eka Siti Nurlaili, Achmad Bahrul Ulum Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PENETAPAN POTENSI UNGGULAN KECAMATAN DI KABUPATEN BANDUNG <p>Economic development is a continuous effort to improve people’s welfare. The main problem in regional development lies in the development of policies that are based on the specific characteristics of the area concerned (endogenous development) by using the potential of human resource, institutional, and natural resource locally (regions). Potential leading sectors in Bandung Regency are agriculture, plantation, livestock, fishery, industry, and tourism. Each sub-district in Bandung Regency region has potential leading sectors that need to be set as leading sectors to be further developed. The purpose of this research was to identify the variables that influence the determination of superior potential of sub-districts in Bandung Regency. The method used to create a model in determining the superior potential of sub-districts in Bandung Regency was the Analytical Hierarchy Process (AHP) method. In this research, 4 sub-districts were taken as an example of the model that were Majalaya, Banjaran, Soreang, and Cimenyan District. Leading sectors assessment of the four districts had the following priority sequence: Majalaya District is for the Industrial sector with a priority weight of 0.326, Agriculture 0.254, Tourism 0.163, Plantation 0.149, and Livestock 0.107; Banjaran District, had the Plantation sector with priority weights 0.294, Industry 0.207, Tourism 0.205, Agriculture 0.165, and Livestock 0.128; Soreang District, had the Agriculture sector with priority weights 0.278, Industry 0.222, Plantation 0.208, Tourism 0.199, and Livestock 0.093; Cimenyan District, had the Tourism sector with priority weights 0.373, Agriculture 0.223, Industry 0.195, Plantation 0.129, and Livestock 0.081. The sub-criteria/factors that were priorities in determining the superio sectors of the district, the top 5 of the 12 sub-criterias/factors were capital, technology, business management, market availability, and prices.</p> Asep Nana Rukmana, Aviasti, Reni Amaranti, Muhammad Akbar Shakira Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 STRATEGI GREEN PRODUCT GUNA MENINGKATKAN KINERJA USAHA KECIL MENENGAH BERBASIS RAMAH LINGKUNGAN <p>Small and Medium Enterprises (SME) product innovation in order to support the concept of green products must be able to convince consumers. Product innovations which have been made that are not in accordance with the tastes of consumers, so the goods are less attractive to consumers. SMEs have difficulties in adjusting products that are environmentally friendly and acceptable to consumers. The high cost in innovating also results in SMEs who hesitate to modify the product. This study aimed to determine, describe, and analyze the effect of green products on the performance of SMEs in Sidoarjo. The first stage was to map green product criterias that affect the performance of environmentally-based SMEs, then analyse the effect of green products on the performance of environmentally-based SMEs. The method used in determining this effect was Partial Least Square (PLS). From the results of data processing, there were factors that influence the performance of environmentally friendly SMEs, namely the green product factor. Then a critical success factor analysis was carried out on the green product factor to determine the strategies that must be taken by environmentally friendly SMEs. The results of the analysis obtained strategy recommendations in improving the performance of SMEs were the strategy of selecting raw materials, choosing energy sources, using the amount of raw materials, and choosing product packaging materials. The strategy was in the context of developing environmentally friendly SMEs so they can improve SME competitiveness.</p> Untung Usada, Arie Widya Murni Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 REPRESENTASI DATA HASIL ANALISA SPASIAL DAERAH RAWAN PENYAKIT CAMPAK MENGGUNAKAN METODE WEIGHT PRODUCT MODEL <p>Measles is a part of many diseases that occur in the tropics as happened in East Java. Measles disease data recorded in the Health Profile Book contains information on tabular data on the number of measles cases, the fatality rate of measles cases, and data that contain infant measles immunization. The purpose of the discussion of this paper is to represent spatial and attribute data resulting from spatial data processing in the spatial analysis process by Weight Product Model (WPM) methods and in the Multiple Attribute Decision Making (MADM). Data representation to determine areas prone to tropical diseases based on infant immunization status, nutritional status, epidemics, and PD3I. The results of the spatial data modeling will be represented into spatial data and attribute data obtained from the preferential value of <em>V<sub>i</sub></em> with the category of classification of tropical disease-prone areas with good, average, fair, and poor immunization status.</p> Anik Vega Vitianingsih, Achmad Choiron, Azizul Umam, Dwi Cahyono, Suyanto Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 KARAKTERISTIK SILIKA POWDER BERBASIS BATUAN TRAS DENGAN PROSES EKSTRAKSI DAN PRESIPITASI <p>Indonesia is a country rich in natural resources such as trass rocks where tras rock deposits in the Rembang area are 28.5 million m<sup>3</sup> with a total area of ​​260 ha. Tras rock is only used for cement and brick raw materials where the economic value is low. Based on laboratory analysis, tras rock contained of SiO<sub>2</sub> = 40-56%. Because of the high silica content, it was very possible to make a silica product that was widely used for industrial needs. The purpose of the research was to obtain optimum conditions in the extraction and precipitation process and also drying to obtain synthetic powder silica that met industry standards. The process carried out was refinement of 100 mesh size trass rock followed by an extraction process with variations in the concentration of NaOH (1; 1.5; 2; 2.5; 3M) and extraction time (60, 90,120, 150, and 180 minutes) in the reactor at a temperature 95<sup>°</sup>C then the solution was filtered and the precipitation process was carried out with 37% HCl through the neutral of pH, the resulting sludge was dried and the content and weight were calculated and the marfology was tested by SEM. The optimum conditions for of silica extraction proces of tras rock was the addition of 3M NaOH with a time of 150 minutes to produce 15.26 grams of silica.</p> Siswanto, Eli Kurniati Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 DINAMIKA DAN PENGENDALIAN SISTEM QUADRUPLE TANK MENGGUNAKAN CONTROLLER PI-PID DENGAN METODE DETUNING <p>In general, industrial processes have characteristics as multivariable processes where the variables interact with one another which causes poor performance. Quadruple tank is a Multi Input Multi Output (MIMO) system that can be used to analyze dynamics and process control schemes with strong interactions. The design is simple but can represent complex systems in the industry so that a reliable controller can be tested using this system. Tuning controller parameters using Ziegler-Nichols only work well for single loops, therefore detuning controllers are needed using the BLT and Mc Avoy methods. The research method is to make mathematical models and determine the specifications of quadruple tanks. Next make a process simulation and identify the transfer function with the step test method. Interaction analysis using the Relative Gain Array (RGA) method. Tuning controller parameters using the Ziegler-Nichols method is then detuned using the BLT and Mc Avoy methods. Simulation of quadruple tank systems both open loop and closed loop can run well and can be used to test the reliability of PI-PID controllers with BLT and Mc Avoy detuning. Based on IAE values, controller with Mc Avoy detuning are superior compared to controllers with BLT detuning, both at level and temperature controllers.</p> Zahrotul Azizah Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 KUALITAS BISKUIT MP-ASI DARI TEPUNG KOMPOSIT KIMPUL-KACANG TUNGGAK DAN TEPUNG SAGU SELAMA PENYIMPANAN <p>Kimpul can be used as various types of products to increase added value, one of that is biscuits. The advantages of biscuits include long-lasting, also easy to digest. Therefore biscuits can be made as complementary foods for ASI (MP-ASI). MP-ASI biscuits are commonly consumed by children aged 12-24 months. MP-ASI biscuits with the raw material of kimpul flour still need other ingredients to increase the protein content in order to meet the quality requirements, such as cowpea flour. To improve the texture to make it softer, it is used sago flour. Sago flour, which has a high starch content, also functions as an adhesive. This study aimed to determine the quality of the MP-ASI biscuit product of kimpul-cowpea composite flour and sago flour during storage. The research used a single factor RAK, namely the type of packaging (PE pouch, aluminum foil pouch, PE-aluminum foil pouch) and repeated three times. Observation during storage was done in every two weeks for six months. The parameters taken were physical characteristics, water content, Aw, FFA, TPC, and peroxide number. The results showed that during storage, there was a decrease in the quality of physical characteristics, increased water content, Aw, FFA, peroxide number, and TPC. Based on physical and chemical quality, the treatment that experienced the lowest quality decline was P1 (Aluminum Foil).</p> Diana Puspitasari, Fungki Sri Rejeki, Endang Retno Wedowati, Koesriwulandari, Akmarawita Kadir Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 ANALISIS DATA GAYA BERAT DI DAERAH BENDAN DUWUR SEMARANG <p>This study was about the gravity in the area of ​​Bendan Duwur, Gajah Mungkur, Semarang. The method used in this research was gravity. The following steps in this activity were: calculating the value of Reader Gravity (g<sub>obs</sub>), Free Air Correction (FAC), Free Air Anomaly (FAA), Bouguer Correction (BC), Simple Bouguer Anomaly (SBA), Terrain Correction (TC), and Complete Bouguer Anomaly (CBA). The results of this research were listed as the Duwur bendan area, which can be seen from the shape of the points contained in the CBA, which is the smallest mGal value, 2.78 and the largest was 14.14. This can be assessed as an anomaly value, blue was the lowest value while pink the highest value, and yellow was the medium category. Based on the results of gravity measurements in the Bendan Duwur area, Semarang, the smallest mGal value was recognized by the TC compared to the g<sub>obs</sub>, FAC, FAA, and BC values. TC was producing 0.24 and the highest value was 1.13. The largest correction value was the FAC, the lowest value of mGal was 16.14, while the highest value of mGal was 26.33. Adapters for the Bendan Duwur soil structure based on CBA including the underground category generated were directly related to tectonic activity, but were more related to geology that requires special sedimentation and anthropogenic activities such as water needed.</p> M. Iqbal Sugita, Anisa Furtakhul Janah, Dewi Rahmawati, Supriyadi, Khumaedi Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 SIMULASI PENGARUH LAJU ALIR LARUTAN NIRA TERHADAP DISTRIBUSI TEMPERATUR PADA FALLING FILM EVAPORATOR <p>Cane juice is the main raw material in sugar factories. The processing of cane juice to produce the highest quality sugar must be through the proper evaporation process. If the evaporation temperature is too high, the cane juice can be damaged and this will affect the quality of sugar produced. The type of evaporator that is often used to reduce water content in food is falling film evaporator. This study obtained to determine the effect of the flow rate of cane juiceon the temperature distribution at the interface and wall. This research was conducted using Matlab Software and the Runge-Kutta Method. The research variables used were the flow rate of 154, 243, and 301 l/hr and the air flow rate of 4, 8 and 10 m<sup>3</sup>/hr. The results showed that the smaller flow rate of the solution, the smaller temperature of the solution at the interface with the same position. The temperature distribution on the wall has increased at the beginning of evaporator operation, but then decreased due to evaporation.</p> Medya Ayunda Fitri Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 KAJIAN POTENSI GAS RUMAH KACA DARI SEKTOR SAMPAH DI TEMPAT PEMROSESAN AKHIR SAMPAH (TPA) RANDEGAN, KOTA MOJOKERTO <p>The final disposal of waste generation is a major environmental challenge in urban areas, especially in developing countries. Waste generation in developing countries will continue to grow as seen from the economic growth and changes in the consumptive patterns of the people, where current lifestyles and activities produce quantity of waste quickly. Waste is not only produced from households, but also from public facilities, such as school, institution, health, offices, markets, hotels, restaurants, and industries which later contribute to the generation of waste in the landfill. Waste management activities in landfills can produce various kinds of greenhouse gas emissions. This study aimed to determine the potential for greenhouse gas emissions from the rate of waste generation in Randegan TPA, Mojokerto City according to the parameters of the waste composition. Based on the research results, it was known that emissions generated from household waste amounted to 1.35 Gg CH<sub>4</sub> and 3.72 Gg CO<sub>2</sub><sub>, w</sub>hile non-domestic waste is 0.264 Gg CH<sub>4</sub> and 0.728 Gg CO<sub>2</sub>.</p> Titien Setiyo Rini, Maritha Nilam Kusuma, Yuwono Budi Pratiknyo, Sri Wulan Purwaningrum Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PENGEMBANGAN WILAYAH PESISIR TIMUR KOTA TARAKAN BERDASARKAN SARANA DAN PRASARANA <p>Tarakan City is an island that has a coast and as the largest city located in North Kalimantan Province which makes tourism as one of the main sectors. Regional development is carried out to determine community needs in the future. This study used quantitative and descriptive qualitative data analysis research using a scalogram analysis to determine the location of growth centres based on the availability of facilities and infrastructure of each region's infrastructures. Based on the analysis of the scalogram showed the hierarchy area by the division of the category based on facilities and infrastructures in the northern coastal area of ​​the Tarakan city.</p> Eko Prihartanto Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PENGIDENTIFIKASIAN SEGMENTASI PENGGUNA SISTEM MANAJEMEN PEMBELAJARAN SEBUAH UNIVERSITAS DENGAN METODE TWO-STEP CLUSTERING <p>This study aims to identify user segmentations of a learning management system at Universitas Negeri Malang using two-step clustering method. Data is collected through an on-line survey which is linked onto the academic information systems. Total number of data are 10.594 responses. This study runs three clustering methods, two-step, k-means, and kohonen clustering, in order to identify the user segmentation. Two-step clustering methods performs better than the other two clustering methods (k-means and kohonen) based on silhouette clustering index. The number of cluster resulted from two-step clustering method are three clusters. The top three of most important factors in identifying the user segmentation are the benefit of the learning management usage in helping to access information, increasing the effectiveness of accomplishing assignments, and students satisfaction on the learning management system services.</p> Agus Rachmad Purnama, Aisyah Larasati Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PENGGUNAAN MEDIA BIOBALL DAN TANAMAN KAYU APU (Pistia stratiotes) SEBAGAI BIOFILTER AEROBIK PADA PENGOLAHAN LIMBAH CAIR RUMAH TANGGA <p>Household liquid waste, which is the residue from the activities of soapy water or bathing water, detergent water from washing clothes, faeces, washing water from cooking utensils containing oil in the settlement. This liquid waste problem needs to get serious attention, because it has complex characteristics and can disturb the health of the environment. One of the efforts to manage the environment is the processing of household wastewater through a series of physical and biological treatments, namely the aerobic biofilter process and using plant bioindicators, namely apu wood (Pistia stratiotes) which is able to absorb various heavy metals such as Fe, Zn, Cu, Cr, and Cd. Domestic wastewater used in this study was greywater, it was from kitchen activities. The purpose of this study was to determine the efficiency of reducing BOD, TSS, and fat oil in residual waste resulting from household activities by processing aerobic biofilter using bioball media and apu wood plants. The process of this research included the process of bacterial culture (seeding) for ± 2 (two) weeks and then proceeded by replacing new waste in the reactor for 5 (five) days at the biofilter reactor in which there was a bioball media and apu wood plants with downward and upward flow using a reactor made of glass with certain dimensions with a discharge of 0.35 ml/sec. The process results in a reduction efficiency of BOD of 70.51% from an initial BOD concentration of 300 mg/L to 88.49 mg/L. The efficiency of reducing TSS was 74.97% from the initial concentration of TSS 321 mg/L to 80.33 mg/L. In addition, the efficiency of reducing fat oil was 73.20% from the initial concentration of fatty oil 300.36 mg/L to 80.51 mg/L, so it can be explained that processing with bioball and apu wood plants can reduce the parameters of BOD, TSS, and fat oil, but the value was still above the standard quality of Minister of Environment Regulation No. 68/Menlhk/Setjen/Kum.1/8/2016.</p> Ayu Pramita, Dwi Novia Prasetyanti, Dini Nur Fauziah Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 KINETIKA REAKSI PEMBENTUKAN TRIKALSIUM PHOSPHATE (Ca3(PO4)2) DARI KALSIUM KARBONAT BERBAHAN BAKU CANGKANG KUPANG PUTIH <p>The development of the health sector to search alternatife material bone’s repair is increasing. Bone is a natural composite containing 60% minerals, 30% matrix, and 10% water. The component of bone mineral is calcium phosphate. Tricalcium phosphate is the type of calcium phospate that used because it has chemical component’s as like bone’s component. In this study, white mussel shell was chosen as a source of calcium and H<sub>3</sub>PO<sub>4</sub> as a solvent. The aim of this research was determining reaction kinetics of tricalcium phospate synthesis from white mussel shells. The research was started by dissolving 50 grams of white mussel shell in 1 L of H<sub>3</sub>PO<sub>4 </sub>3% at reaction time with variation 2, 4, 6, 8, 10 minutes and reaction temparature with variation 40, 50, 60, 70, 80<sup>o</sup>C and then filtered. The filtrate was analyzed for the content of phosphoric acid while the residue was calcined at 900<sup>o</sup>C for 5 hours to remove the water. The reaction rate increased with increasing time and temperature. The highest phosphate acid conversion was obtained at a temperature of 80 ° C, with a reaction time of 10 minutes is 90.92%. The controlling step that controlled tricalcium phosphate synthesis from white mussel shell followed pseudo first-order equation with the Arrhenius equation.The results of XRD analysis found that89%of Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>was formed.</p> Caecilia Pujiastuti, Luluk Nofitasari, Rif’atul Firda Erfani Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PEMANFAATAN LIMBAH BATANG UBI KAYU DAN PLASTIK SEBAGAI BAHAN BAKU PEMBUATAN PAPAN PARTIKEL <p>Particle board consists of sheets of material made from wood chips or materials containing lignocellulose such as flakes and strands to be joined by using a binder and by providing various aids such as heat and press. The purpose of this research was to study the physical value (moisture content, thickness development, and density) and mechanical properties (elasticity and tensile strength) and its conformity to SNI. Particle board making in this study was a mixture of wood powder with plastic Low Density Polyethylene (LDPE) with a composition according to variable pressure pressed with 25 kg/cm<sup>2</sup> with long pressing at the required temperature for an hour and added with 30 minutes of packing. The variables used were temperature and material composition. The making of particle board from cassava powder and plastic LDPE based on air content test, thickness development, and straight tensile strength were appropriate to SNI. The best results obtained in this study was the composition comparison of plastic LDPE: wood powder (80; 20) with a temperature of 160℃ with a moisture content of 1,2027%, thickness development of 9.217 %, density of 0,831 g/cm<sup>3</sup>, MOE of 21304,600 kgf/cm<sup>2</sup>, and perpendicular tensile strength of 31,094 kgf/cm<sup>2</sup>. &nbsp;This particle board passed all tests and have the average value&nbsp; and better characteristics compared to others.</p> Laurentius Urip Widodo, Fibriangi Miya Enggar Pratama, Sandika Mudji Prastya Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 ANALISIS BEBAN KERJA PERSONIL SORTIR PADA PROSES PRODUKSI SEDIAAN KAPSUL LUNAK DI PT X <p>Productivity is one of the important aspects that must be owned by a company to achieve the goals. Therefore, to improve productivity, it is necessary to analyze the workload of employees and improve the work procedures. Workload analysis carried out in this study aimed to determine the optimal workforce requirements of the sorting process in the soft capsule production unit at Pharmaceutical Company PT X. The observational method has been applied to this study. The data of this study were obtained by observing the process directly and conducting face-to-face interviews with the employees at the location of soft capsule production. Based on the workload analysis using a Full-Time Equivalent (FTE) method, it was found that a total value of 2.07 was obtained from the eleven activities in the sorting section. If the FTE was assessed for each person in the sorting section, then the FTE value for each personnel was 0.52. This value is in the underload category. Therefore, the number of personnel and the work procedures need to be adjusted.</p> Mercyska Suryandari, Siti Annurijati Hatidja, Christina Avanti Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 EFEKTIFITAS MODUL ELEKTRONIK TERINTEGRASI MULTIPLE REPRESENTATION PADA MATERI IKATAN KIMIA <p>This research aimed to categorize the results of an electronic module effectiveness that integrated by multiple representation on chemical bonding. The research approach used in this research was descriptive quantitative. The effectivity results of N-Gain pretest and posttest of students critical thinking skills in the control class were 0.3 with the low category and the experimental class were 0.6 in the medium category, and the results of independent t-test on sig. (2-tailed) of 0.047&lt;0.05, it meant that there were significant differences between the results of the control and experimental classes. Based on the results of study, it was found that the electronic module integrated multiple representation of high school chemistry learning in chemical bonding material was effective to be used in the learning process.</p> Eka Putra Ramdhani, Fitriah Khoirunnisa, Nur Asti Nadiah Siregar Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700 PENURUNAN KADAR COD MENGGUNAKAN SARINGAN PASIR DUAL MEDIA PADA PENGOLAHAN AIR MINUM <p>Allowance for COD content in raw water can use a dual media sand filter. Sand filters have various advantages, namely low-cost and environmentally friendly operational costs and are able to produce quality processed water that meets quality standards. This study uses a dual media sand filter with dimensions of sand and gravel depth of 40 cm and 20 cm respectively, running the reactor for 15 days (sampling every 2 days) with 14 days of acclimation. The purpose of this research is to obtain the optimum flow rate from the sand filter reactor in setting aside COD in raw water. The results showed a dual media sand filter reactor unit with a flow rate of 0.3 m3 / m2.hour has a higher efficiency in setting aside COD compared to a reactor with a flow rate of 0.2 m3 / m2.hours which is 52.3%, where the magnitude This removal efficiency is influenced by biological processes in the form of bacterial activity in the schmutzdecke layer and chemical processes in the form of adsorption.</p> Laily Noer Hamidah, Ardhana Rahmayanti Copyright (c) 2020 Fri, 03 Jul 2020 00:00:00 +0700