Journal of Engineering and Scientific Research (JESR)
Not a member yet
110 research outputs found
Sort by
An Identification of Porphyry Deposit Based On Time Domain Induced Polarization Data Analysis in The Papua Region
No full textPapua is one of the islands in Indonesia which has an abundance of economic metal mineralization in Indonesia. The types of mineralized deposits on the island of Papua are porphyry, skarn and epithermal, where porphyry deposits are identified in the study area, which were identified early by geological conditions. The geophysical approach is carried out using Time Domain Induced Polarization data analysis, TDIP measurements are carried out on an area of 2.24km2, with a total of 3 line oriented southeast-northwest along 3 km. Based on TDIP data analysis, there’s low resistivity anomaly correlates with high chargeability which is interpreted as a Potassic body at an elevation of 500m, while above it there are Serisitic-Clay-Chlorite and Serisitic-Clay-Pyrite alterations with high metal sulfide content up to 1100m elevation
Effect of nira (Arenga pinnata Merr) tapping tools on the abudance and identification of microorganisms
Full text linkArenga trees are known to have economic value, especially its water, called nira. Nira contains sucrose with a neutral pH at the start of tapping, but after 4 hours, the quality of nira will decrease. This is due to the influence of air (aerobic), so that the presence of microbes in nira becomes abundant and causes the fermentation process to take place more quickly. The fermented nira is known as ‘tuak’, the traditional drink of Bataknese people. Batak people believe the benefits of drinking tuak for health. In this study, nira was collected using a simple tapping device (APUS) with the aim of minimizing contact between surrounding air and bunches. APUS was applied to Arenga bunches in Samosir. Nira from tapping with and without APUS will be observed for microbial abundance (its density). Furthermore, the microbes contained in nira will be identified based on their morphological characters (physically). Identification aims to determine the types of microbes that are present from a natural habitat. Next, the microbes are isolated and studied for their shape and properties, before the microbes are utilized further. The results of microscopic observations showed that the nira sample tapped without using APUS (sample A) had a higher and more turbid microbial density and showed non-uniform microbial size (from large to small, like powder), while nira sample tapped with APUS (sample B) showed almost uniform microbial size with cleaner looking spots. Furthermore, the microbes in sample B were isolated on specific media. Acquisition of colonies in the form of acetic acid bacteria (BAA), lactic acid bacteria (BAL), and yeast. BAA isolates showed a group of gram-negative bacteria that could not retain the crystal violet stain when rinsed with alcohol, because the peptidoglycan in gram-negative bacteria was thinner than gram-positive ones, while BAL isolates were the opposite. The measurement of the number of colonies was carried out using the TPC (Total Plate Count) method at 6 dilutions and obtained for BAL and yeast were 147 and 30 colonies respectively
CONTROL DRIP RATE OF INTRAVENOUS FLUIDS BASED ON HEART RATE WITH A MONITORING SYSTEM USING THINGSPEAK WEBSITE
Full text linkDehydration is a state of decreasing the amount of fluid in the body accompanied by increased heart rate. One of the treatments that must be done for dehydrated patients is to give infusions periodically, which must be supervised by medical personnel. However, controlling patient intravenous fluid drops in some hospitals or public health centres is still done manually. Based on this problem, a device can adjust the drip rate of intravenous fluids based on heart rate. This research made a prototype of controlling the drip rate of intravenous fluid based on heart rate using NodeMCU ESP8266 microcontroller, MAX30100 sensor for heart rate reading, optocoupler sensor for drip rate reading, and servo motor for roller clamp drive. From the test results, the system has been able to control the drip rate of infusion based on heart rate with a range of (80 – 89) bpm which has the number of infusion droplets (24 – 35) TPM and a range (90 – 99) bpm that has the number of drip infusions (36 – 47) TPM, then send the heart rate data and drip rate of the injection to the thing speak website every 15 seconds. Heart rate readings with MAX30100 sensors have an error of 2.51% and an accuracy of 97.49%. Meanwhile, the drip rate reading with the optocoupler sensor has an error of 0.83% and an accuracy of 99.17%
SNR Gain Evaluation in Narrowband IoT Uplink Data Transmission with Repetition Increment: A Simulation Approach
Full text linkDeploying Internet of Things (IoT) on a large scale necessitates widespread network infrastructures supporting Machine Type Communication. Integrating IoT into cellular networks like LTE, known as Narrowband-IoT (NB-IoT), can fulfill this infrastructure need. Standard 3GPP Release 13 introduces NB-IoT's Repetition features, expanding radio transmission coverage while maintaining LTE performance. Focusing on uplink data traffic, this study examines NB-IoT's repetition mechanism, grid resource distribution, and NPUSCH performance through simulations. Results show that at SNR greater than -5 dB, maximum repetitions of 128 yield the highest BLER, while minimum repetitions of 2 result in the lowest. Quadrupling repetitions increases SNR by 5 dB, emphasizing repetition's role in error mitigation and uplink reliability, especially in challenging SNR conditions. For optimal throughput in SNR above -5 dB, maximum repetitions of 128 for NPUSCH format 1 are recommended. These findings underscore the importance of repetition in enhancing Narrowband IoT performance, offering insights for system optimization, where increasing the number of repetitions generally leads to higher SNR gain. The attained BLER and throughput values from Narrowband IoT simulations highlight the robustness of data transmission across varying channel conditions, affirming NB-IoT applicability to a wide range of IoT applications
The Geothermal manifestations linkage with the Siulak Fault segment in Kerinci: Structural Geology and Geothermal
No full textGeothermal manifestation on the Sungai Medang and Semurup, Kerinci Regency appear along the Sumatran Fault System. Geological setting as well as this are interesting things to understand from the linkage between of them. To know this process, it is necessary to understand the fault structure mechanism and the presence geothermal features manifestations. The aim of this research in addition to understanding the linkage between of them, which comprehend the fault mechanism of the fault structure, so as to know the role of the fault structure in the appearance of geothermal features manifestation. Geothermal manifestation in Sungai Medang has geothermal features manifestation surface including hot spring, hot pool, geyser dome, hydrothermal alteration rock, sinter silica, and carbonate sinter. The fault structure measured and analysis on the eastern part of Siulak Fault segment of the Sungai Medang was found to be a normal right slip fault, but western part of Siulak Fault segment on the Semurup which strike-slip fault and normal right slip fault. The existence of geothermal features manifestation surface in fault zone of Siulak Fault segment is evidence that, the role of faults is as a controlled by apeear geothermal manifestation. The fault structure mechanism is the result of dextral movement of Siulak Fault which forms a pull-apart basin. This basin is single fault-bend basin as one master fault of active segment. The fault regime stress analysis obtained direction compressional force is trending north-northwestern and south-southeastern. This regime stress is locally stress on Sungai Penuh Basin
Landslide Potential Zone Identification Using Electrical Resistivity Tomography Modeling
Full text linkThe Pidada area, Panjang sub-district, Bandar Lampung City, is located on the physiography of Bukit Barisan and is also influenced by the movement of the Sumatran fault and the Lampung-Panjang fault, so the morphological condition is hilly with steep slopes which cause natural disasters such as landslides. In this study, the knowledge of subsurface rock lithology and slip-slide-prone zones was carried out using the Wenner-Schlumberger geoelectric method. Based on the Wenner-Schlumberger configuration, the top layer consists of weathered rock associated with clay tuff and sandy tuff with a resistivity of 7.2 ?m - 135 ?m. Coarse-grained tuff and fine-grained tuff with resistivity values ??of 135 ?m - 437 ?m, and the third layer combines breccia and igneous rock from the Tarahan Formation with resistivity values ??of more than 437 ?m. The clay sand layer acts as a slip plane. The type of landslide developed in the research area is a crawling soil landslide
Green Building Assessment and Recommendations for Optimization Case Study of the Rectorate Building the University of Lampung
Full text linkThe Green Building Concept is a concept that offers a method of managing buildings with less energy and resources utilization to minimize the environmental impact. Since its implementation to be mandator, it is time for the University of Lampung to start implementing this concept. This research was aimed at assessing the Rectorate Building rating based on the national standard on Green Building Certification (Greenship-GBCI). There were several steps in conducting this research. Firstly, an opinion survey was conducted to measure the level of satisfaction of the building’s users. Secondly, a series of measurements related to lighting, temperature, humidity, noise, and air quality were carried out. Furthermore, an interview survey related to the operation and maintenance of the building were conducted. Finally, all of these data were entered in the Green Building rating tool for existing buildings. The results showed that the Rectorate Building score was 23 out of 117. This score is way below the score for a bronze rating of 35. Therefore, corrective action must be taken in order the building operation management to meet the Greenship-GBCI standard. Assessment also needs to be done on buildings througout the university for a reference in developing the University of Lampung Eco-campus program
Analysis of Losses Due to Load Unbalance in a 2000 kVA Transformer at Supermall Mansion 2 Tower Tanglin Surabaya
Full text linkThe load unbalance causes a neutral current, the current flowing in the neutral conductor will cause an increase in losses in the transformer. The greater the losses incurred, the efficiency and reliability of the transformer will decrease. Based on this, a study was conducted on analyzing the losses on distribution transformers at Supermall Mansion 2 Tower Tanglin which aims to determine the percentage value of transformer loading, the value of transformer imbalance, the value of transformer losses, and the value of transformer efficiency. This is done so that the value of the installed transformer does not exceed the applicable SPLN value. During the measurement, it was found that the percentage value of the transformer loading was 38.88% during the daytime and 48.89% at night (maximum SPLN 80%, minimum 40%). The load unbalance value is 11.66% during the daytime and 10.33% at night (SPLN is categorized as good if < 10%). Copper losses (Pcu) are 91.3 kW during the daytime and 94.2 kW at night. The value of losses due to neutral currents is 0.134 kW with a percentage of 0.0071% during the daytime and 0.173 kW with a percentage of 0.0090% at night. The percentage of the current value in the neutral conductor is 26.36% during the day and 24.04% at night (SPLN is categorized as good if < 20%)
An Analysis of Factors Affecting Labor Productivity of Upper Structure Work on the Hurun Beach Resort Project Using the AHP (Analytic Hierarchy Process)
No full textDevelopment and project development in Indonesia is very important and is expected to have a good impact on the economy of this country. To achieve reliable development, it is necessary to manage human resources with the aim of increasing construction productivity. The factor influencing productivity is one of the benchmarks for the success of construction development implementation. This study aims to analyze the factors and occupations that have a relative effect on labor productivity in the Hurun Beach Resort Project. The AHP method is the research method used to carry out the analysis in this study. This is because decision-making criteria and alternatives become a reference to obtain achievements so that the percentage of the desired productivity factor can be known. Based on the results of the sub-criteria analysis, the relatively influential factor is the shop drawing with a weight of 0.19432, the second is the experience factor of 0.11948, and the third is the factor of adding working hours 0.10936. After analyzing the sub-criteria and then getting the final weight, the alternative superstructure work that is relatively influential is formwork work with a weight of 0.03413, the second is ironwork 0.03049, and the third is casting work 0, 0207
A Influence of Reservoir Water Level Fluctuations of Reservoir B (Rusunawa) on Groundwater Availability at the Environment of Lampung University: English
No full textThe presence of four reservoirs as rainwater collection infrastructure at the University of Lampung is expected to enhance the infiltration process and recharge the groundwater aquifers. However, the threat of water scarcity in the area may arise due to the reduction of recharge areas. Therefore, a comprehensive study is necessary to understand the important factors in maintaining groundwater availability. This research aims to analyze groundwater aquifers, identify fluctuations in the water level of Reservoir B, and analyze the relationship between the elevation of the water level in the reservoir and the availability of groundwater in the University of Lampung environment. The research methodology involves the interpretation of geoelectric data and the calculation of water level fluctuations in the reservoir. The analysis results indicate that the shallow groundwater aquifer is estimated to be located at depths ranging from 10 to 30 meters, while the deeper aquifer is situated at depths of 80 to 130 meters with a layer of sandy tuff. The highest fluctuation in water level is recorded at 14 cm during rainfall with an intensity of 52.1 mm/day. There were no significant changes in the water level observed during rainfall with intensities ranging from 0 to 2.4 mm/day, and the average fluctuation observed is approximately 0.5 cm every 8 hours