USU-IR Repositori Institusi Universitas Sumatera Utara
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Analysis of the Effect of Current Regulation Using the Votol EM-150 BLDC Controller on Performance Balance and Energy Consumption of a 72V 39Ah Lithium-Ion Battery in an Electric Go-Kart Vehicle
No full textCurrent setting is a factor that affects the performance of electric vehicle systems and their energy consumption. Without proper current setting or limitation, the BLDC motor will operate with uncontrolled current, which can lead to issues such as overheating, overcurrent, performance imbalance, and a decrease in energy efficiency, potentially damaging components of the electric go-kart in the long run. This study aims to analyze the effect of current setting using the Votol EM150 BLDC controller on performance balance and energy consumption in an electric Gokart with a 72V 39Ah lithium-ion battery, at various current limit settings of 50 A, 55 A, 60 A, 65 A, and 70 A. A data logger is used to record data during testing. The results show that the fastest acceleration time for the 70 A current limit is 6.89 seconds, with the lowest energy consumption of 9.043 Wh compared to other current limits. In the 1-lap test, with a distance of 1,100 meters, the maximum speed at the 70 A current limit is 70 km/h, with a travel time of 88.31 seconds and an energy consumption of 93.782 Wh. This study develops a prediction model specifically for the Mini Fishing Circuit to determine lap time and energy per lap for the electric go-kart. With this model, the optimal current setting can be identified to meet the target time of ≤ 90 seconds per lap, a target of 34 laps, a target distance of 35 km, and the ability to complete 30 laps with 5% energy remaining. The prediction model also successfully forecasts the energy used, remaining energy, and the time required for each current limit to complete the target of 7 to 15 laps, which can be used as a basis for planning and managing energy in various race applications as well as for recreational or entertainment use.143 PagesSkripsi Sarjan
Induction of Genetic Variation Through Gamma Ray Irradiation in Local Lowland Rice (Oryza sativa L.) Cultivar Sicantik
No full textThis study aimed to analyze the genetic variation of the local lowland rice (Oryza sativa L.) cultivar Sicantik in the M1 generation through gamma-ray irradiation. The research was conducted in the screen house of the Faculty of Agriculture, Universitas Sumatera Utara, at an altitude of approximately ±25 meters above sea level, from February to November 2025. The experiment used a non-factorial Randomized Block Design (RBD) with one factor consisting of four irradiation doses: G0 (control), G1 (100 Gy), G2 (200 Gy), and G3 (300 Gy). The results showed that the LD₅₀ (Lethal Dose 50) of the Sicantik cultivar due to gamma irradiation is 364.48 gray. Gamma-ray irradiation significantly affected plant height, number of tillers, number of productive tillers, flowering time, and harvest time. For yield-related parameters, irradiation also significantly influenced grain weight per hill. The 200 gray dose produced the best results.76 PagesSkripsi Sarjan
Analysis of Regional Potential in Increasing Economic Growth in Deli Serdang Regency
No full textThis study aims to find out to analyze and find out which sectors are
regional potentials in Deli Serdang Regency, analyze and find out potential
sectors that deserve to be developed to increase economic growth in Deli Serdang
Regency, as well as analyze and find out the strengths, weaknesses, opportunities,
and threats in the sector. potential in supporting the achievement of economic
growth in Deli Serdang Regency.
This type of research is descriptive quantitative research. The type of data
used in this study is secondary data originating from the Central Statistics Agency
of Deli Serdang and North Sumatra. The analysis technique used is Location
Quotient (LQ) analysis, Shift Share, and SWOT analysis.
The results of this study indicate that there are 5 (five) potential sectors in
Deli Serdang Regency during the period 2012-2023, namely the electricity and
gas procurement sector, the accommodation and food and drink supply sector, the
construction sector, the transportation and warehousing sector, and the
manufacturing industry sector. In addition, of the 5 (five) potential sectors that
have the fastest or progressive growth in Deli Serdang Regency, there is 1 (one)
potential sector that has the most progressive growth or above the average of
other sectors, namely the transportation and warehousing sector. There are
several strengths of each potential sector, namely the government can distribute
electricity and gas throughout the region, provide adequate accommodation,
develop public infrastructure, increase the number of public transportation and
expedition services, and process agricultural and fishery products as finished
products. The weaknesses of each potential sector are weak government support
in increasing the potential of power generation resources, lack of land use to
develop the accommodation sector, the government does not focus on meeting
community needs for housing, the government does not support the expansion of
lines and service standards for the transportation and warehousing sector. , and
only a few processed products from agriculture and fisheries are circulating in
the community. Opportunities from each potential sector are to have regional
potential that supports electricity and gas procurement, there is a lot of land to
develop the accommodation sector, high public demand in the construction sector,
high community need for expedition and transportation services, and has a lot of
agricultural and fishery products. The threats from each potential sector are the
increasing public demand for electricity and gas, the high number of tourists
visiting, the increasing population, many foreign companies setting up shipping
services, and high exports of agricultural and fishery products.91 PagesSkripsi Sarjan
Association Between Viral Load, Cluster of Differentiation 4, and Serum Homocysteine Levels With HIV–Related Peripheral Neuropathy
No full textBackground: Peripheral neuropathy is the most common neurological complication of human immunodeficiency virus infection, with a prevalence of approximately 19–42%. Elevated viral load is associated with an increased risk of peripheral neuropathy, partly through direct and indirect neurotoxic effects on peripheral nerves. Decreased CD4 counts lead to immune dysregulation and macrophage activation, which trigger the release of pro inflammatory cytokines and result in axonal degeneration. Increased serum homocysteine levels, which are frequently observed in HIV infection, can cause neuronal injury through excitotoxicity, oxidative stress, and DNA damage, leading to distal axonal degeneration.
Purpose: To determine the association between viral load levels, CD4, and serum homocysteine levels with peripheral neuropathy related to human immunodeficiency virus.
Method: This study was an observational analytic study with a cross sectional design conducted 50 HIV patients at Adam Malik Hospital in Medan. Peripheral neuropathy was diagnosed using the Brief Peripheral Neuropathy Screening (BPNS) tool and nerve conduction studies, while serum viral load, CD4 count, and homocysteine levels were measured using real time PCR, flow cytometry, and enzymatic assays, respectively. The associations of viral load, CD4 count, and serum homocysteine levels with HIV associated peripheral neuropathy were analyzed using chi square and Mann–Whitney tests, followed by multivariate logistic regression analysis to obtain odds ratios and 95% confidence intervals.
Results: Based on the BPNS, there was a significant association between viral load (p<0.001), CD4 count (p<0.001), and serum homocysteine levels (p<0.001) with peripheral neuropathy. According to nerve conduction studies, there was a significant association between viral load (p=0.003), CD4 count (p=0.018), and serum homocysteine levels (p=0.003) with peripheral neuropathy. With respect to sural nerve amplitude, there was a significant association between viral load (p=0.003), CD4 count (p=0.001), and serum homocysteine levels (p<0.001). In multivariate analysis, only viral load remained significantly associated with peripheral neuropathy as defined by BPNS (p=0.010; OR 9.643; 95% CI 1.722–54.015) and nerve conduction studies (p=0.038; OR 5.361; 95% CI 1.097–26.195). For sural nerve amplitude, viral load (p=0.048; OR 9.629; 95% CI 1.017–91.206) and CD4 count (p=0.037; OR 5.732; 95% CI 1.106–29.691) showed a significant association with abnormal amplitude.
Conclusion: Viral load showed the most consistent association with HIV related peripheral neuropathy, based on both BPNS and nerve conduction studies, and together with CD4 was significantly associated with sural nerve amplitude. In the bivariate analysis, CD4 and serum homocysteine were also associated with HIV related peripheral neuropathy.149 PagesTesis Magiste
Analysis of Factors Affecting the Volume of Banana Exports from North Sumatra to Malaysia
No full textBananas are one of Indonesia’s main horticultural commodities with high production volumes each year. One of the major banana-producing regions that plays an important role in exports, particularly to Malaysia, is North Sumatra Province. On the island of Sumatra, almost the entire volume of banana exports to Malaysia originates from this province. However, the contribution of exports to the total banana production in North Sumatra remains relatively low, indicating that export potential has not yet been optimally utilized. This study aims to analyze the factors affecting the volume of banana exports from North Sumatra to Malaysia during the period 2017–2024. The independent variables in this study are banana production in North Sumatra, the average export price (Free On Board/FOB) of bananas from North Sumatra to Malaysia, the Rupiah exchange rate against the US Dollar, inflation in Malaysia, and inflation in North Sumatra. This study uses quarterly secondary data and is analyzed using multiple linear regression with EViews 12 software. The results show that simultaneously all independent variables have a significant effect on the volume of banana exports from North Sumatra to Malaysia. Partially, the Rupiah exchange rate against the US Dollar and inflation in Malaysia have a significant effect on banana export volume.80 pagesSkripsi Sarjan
Juridical Analysis of Unlawful Acts in Copyright Infringments of the Song “Obuk Celleng” (A Study of Supreme Court Design No. 464 K/Pdt.Sus-HKI/2024)
No full textThe proliferation of song copyright infringement in the digital era, particularly on the YouTube platform—where works are frequently used or altered without the original creator's permission—serves as the background of this research. The primary issues examined include the legal regulation of copyright, the legal consequences of Unlawful Acts (Perbuatan Melawan Hukum/PMH) within the context of copyright, and a juridical analysis of the judges' considerations in the Supreme Court Decision Number 464 K/Pdt.Sus-HKI/2024.
This research uses a normative juridical with a descriptive-analytical approach. Data collection was conducted through library research, utilizing primary, secondary, and tertiary legal materials. The data were analyzed qualitatively to draw deductive conclusions.
The results of the study indicate that the act of duplicating the lyrics, notation, chords, and arrangement of the song "Nasib Force One Buruk" owned by Rahman Efendi into the song "Obuk Celleng" without permission constitutes an Unlawful Act as regulated under Article 1365 of the Indonesian Civil Code (KUHPerdata). In its decision, the Supreme Court declared that Rahman Efendi is the legitimate creator and copyright holder, and subsequently annulled the copyright registrations made unlawfully by other parties. The conclusion of this research confirms that the PMH instrument is highly effective in protecting the economic and moral interests of creators in intellectual property rights disputes in Indonesia.96 PagesSkripsi Sarjan
Implementation of IoT-Based Monitoring and Automatic Control on Gas Storage Systems from Multilayer Plastic Pyrolisis
No full textThe issue of plastic waste, particularly multilayer plastic, continues to escalate due to
its highly non-biodegradable nature. Pyrolysis offers an effective method for
converting plastic waste into gas that can be utilized as an alternative energy source.
In this research, an Internet of Things (IoT)–based gas storage system for pyrolysis
products was successfully designed and developed to enable real-time monitoring of
temperature and pressure, as well as automatic relay control throughout the
operational process. A Type-K thermocouple integrated with the MAX6675 module
was used to measure reactor temperature, while a pressure transmitter monitored the
gas pressure in the storage tank. All data were displayed on a 20×4 LCD and
transmitted to the ThingSpeak platform using the ESP8266 module. Automatic control
of the solenoid valves was implemented through a dual-relay system based on
predefined pressure limits. The experimental results showed that the pyrolysis process
successfully generated gas with temperature increasing from 35°C to approximately
240°C and pressure reaching up to 3 bar. Both temperature and pressure sensors
demonstrated stable and consistent performance, as reflected in both on-device
readings and IoT-based monitoring. The automatic control system effectively switched
relay operation once the pressure threshold was reached, ensuring system safety and
operational stability. The produced gas was also successfully applied to a 5500-watt
generator, enabling it to operate stably for approximately 5 minutes with a consistent
output of 220 volts. These findings demonstrate that integrating pyrolysis with IoTbased instrumentation enhances monitoring efficiency, operational safety, and the
potential utilization of pyrolysis gas as a viable alternative energy source.83 pagesSkripsi Sarjan
The Role Of Parents Towards School Dropouts In Lawe Desky Village Babul Makmur Subdistrict Southeast Aceh District
No full textThis study aims to examine the role of parents in the educational lives of school dropout children in Lawe Desky village, Babul Makmur Sub-district, Aceh Tenggara Regency. The number of school dropouts in this villige is relatively high compared to neighboring villige and has contributed to the emergence of risky social behavior among children. This research employs a qualitative approach using a case study method. The informants consist of school dropout childen, parents, teachers, village officials, and school reprensentatives. Data were collected through in-depth interviews, observation, and documentation, and analyzed using the Miles and Huberman model, including data reduction, data disply, and conclision drawing. The findings indicate that parents‟ roles in supporting children‟s education have not been optimally fulfilled. Parents tend to provide limited attention, supervision, and learning motivation. Education is often viewed as a secondary need, particularly under economic constraintas. Additionally, parents‟ low education as a fundamental right of children. Poor communication and lack of parental guidance result in decreased motivation to attend school, leading children to drop out. The study concludes that weak parental involvement is a key factor contributing to school dropout cases in Lawe Desky Village. Therefore, increased parental awareness, active involvement, and support from government and social institutions are necessary to reduce school dropout rates.126 PagesSkripsi Sarjan
Analysis of Combustion Characteristics in Stationary Engine Fuel a Mixture of Pyrolysis Gasoline and Pertalite
No full textThe utilization of plastic waste through the pyrolysis process into alternative
fuel is one of the solutions to address the fossil fuel energy crisis and environmental
problems caused by plastic waste. This study aims to analyze the combustion
characteristics and exhaust emissions of a stationary engine using a blend of pyrolysis
gasoline and Pertalite. Testing was conducted with variations of Pertalite and
pyrolysis gasoline blends, namely G100P0, G90P10, G70P30, G50P50, and G0P100.
Parameters tested include in-cylinder pressure, peak combustion pressure, IMEP,
HRR, combustion location and duration, indicated power, specific fuel consumption,
thermal efficiency, and emission gases. The results showed that increasing the
pyrolysis oil ratio decreased the Mean PCP in the G0P100 sample, accompanied by
an increase in CoV PCP. This decrease in PCP correlates linearly with the decrease
in Mean IMEP and engine power. Technically, the high viscosity and density of
pyrolysis oil inhibit atomization, thereby reducing HRR, delaying burn location by 1-
3°CA, and extending burn duration by 1-3°CA. Analysis results indicate that while the
addition of pyrolysis gasoline lowers peak performance and flame propagation speed,
the highest thermal efficiency was achieved with the G90P10 blend, and the best ISFC
was found in G50P50. This indicates that pyrolysis oil has great potential as an
alternative fuel because its high heating value is able to compensate for the longer
combustion duration.71 PagesSkripsi Sarjan
Analysis of Superior Agroindustry Products in Langsa City and The Development Strategies
No full textSuperior products in a region must be developed to increase added value and the economy of the region. The development of superior products is carried out using strategies so that the results and development process can be well organized. Business development strategies include product development that aims to increase sales by improving the quality of existing products or product development. This study aims to determine the superior agroindustrial products produced in Langsa City and to analyze the development strategy of superior agroindustrial products produced in Langsa City. The analysis methods used are the Exponential Comparison Method (MPE) and SWOT analysis. The results of the study show that the leading agro- industrial products in Langsa City are shrimp paste, sweet potato chips, banana chips, tempeh chips, rengginang, mangrove jam and mangrove syrup. The SO strategy is the most appropriate approach for the development of the rengginang agroindustry in Langsa City. This strategy emphasizes the use of forces such as ease of distribution, the presence of stores/outlets, and the use of social media to respond to external opportunities such as increased internet access, interest in local products, and government support. Wide market opportunities can be taken advantage of by expanding distribution outside the region, as well as encouraging product innovation through attractive flavor variants and packaging. In addition, the involvement of the younger generation in production and marketing can also strengthen the competitiveness of products.96 PagesSkripsi Sarjan