USU-IR Repositori Institusi Universitas Sumatera Utara
Not a member yet
100433 research outputs found
Sort by
Isolation and Identification of Flavonoids Compound from Bark of Pirdot
No full textIsolation and identification of flavonoid compound from the bark of Pirdot (Saurauia vulcani Korth.) had been carried out through the maceration extraction stage with methanol solvent. The methanol extract dissolved with ethyl acetate was separated and concentrated. The concentrated extract of ethyl acetate was dissolved with methanol and partition extracted with n-hexane. The methanol layer is then evaporated until all the methanol has evaporated. The concentrated methanol extract was then analyzed by TLC, then separated by column chromatography with silica gel as the stationary phase and chloroform: ethyl acetate (90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80, and 10:90) v/v as the mobile phase. The second fraction with a value of Rf = 0.55 uses chloro: ethyl acetate (30:70) v/v. Based on the results
analyzed with a UV-Visible Spectrophotometer, it shows that there are two absorption bands with a wavelength (λmax) of 311 nm in band I and 272 nm in band II. The
results of FT-IR spectrum analysis show the presence of O-H, CH sp3
, C=O, C=C aromatic, C-C-O, CH sp2 groups. The results of 1H-NMR spectrum analysis show the of H-3 protons at δ = 6.7336 (ppm). Infrared (FT-IR), and Proton Nuclear
Magnetic Resonance Spectrophotometry (¹H- NMR). Spectroscopic data shows that
the isolated compounds are flavones.57 pagesSkripsi Sarjan
Analisis Humor Verbal pada Open Mic Stand-Up Comedy Pandji Pragiwaksono di New York City
No full textThis study examines the use of Knowledge Resources from Attardo and Raskin's General Theory of Verbal Humor (GTVH) in Pandji Pragiwaksono's stand-up comedy open mics in New York City, focusing on 41 joke sets. This qualitative research was conducted using the content analysis method to explore how the six Knowledge Resources—Script Opposition (SO), Logical Mechanism (LM), Situation (SI), Target (TA), Narrative Strategy (NS), and Language (LA)—are utilized to create humor. The analysis reveals the predominance of SO types such as "The Normal vs. the Abnormal," showcasing Pandji's ability to highlight societal and cultural incongruities that resonate in cross-cultural contexts. LMs like "Exaggeration" and "False Analogy" are frequently employed, reflecting his skill in blending accessible humor with creative depth to connect with diverse audiences. The study also explores Pandji’s strategic use of SI, NS, LA, and TA Knowledge Resources to craft relatable and impactful comedic narratives. Themes such as immigrant identity crises, cultural misunderstandings, and personal struggles are framed through monologues and conversational delivery, allowing for engaging and authentic storytelling. By navigating cultural boundaries and addressing sensitive topics with humor, Pandji exemplifies the universality and adaptability of stand-up comedy. This research provides valuable insights into how humor can transcend cultural differences while remaining rooted in authentic and meaningful experiences.178 PagesTesis Magiste
The Role of the Medan City Housing and Settlement Agency in Meeting the Housing Needs of Low-Income Communities in Medan Deli District
No full textThe role of government in the context of regional autonomy, where each region is given the authority to regulate and manage its own government affairs within its jurisdiction, including mandatory matters such as the need for adequate housing for the community. This study aims to analyze the role of the Medan City Housing and Settlement Agency in meeting the housing needs of low-income communities in Medan Deli District.
The research method used in this study is descriptive qualitative. Data and information were collected through interviews, observations, documentation, and literature review. The research was conducted at the Housing and Settlement Area Office of Medan City and the UPT managing Kayu Putih Rusunawa. Informants in this study included the Head of the Housing and Settlement Area Division of Medan City, the Head of UPT for Kayu Putih Rusunawa in Medan Deli District, and the residents of Kayu Putih Rusunawa. The data and information were analyzed based on the theory of Horoepoetri (2003), which includes: the role as a policy, the role as a strategy, and the role as a communication tool.
The results of this study indicate that the Housing and Settlement Area Office of Medan City and the UPT managing Kayu Putih Rusunawa have made efforts to fulfill the housing needs of Low-Income Communities through the Kayu Putih Rental Simple Flats in Medan Deli District. However, several challenges remain in its implementation. One such challenge is the lack of socialization regarding the new policy issued by the Medan City Government concerning the increase in rental prices, which has caused disappointment among residents. In terms of strategy, there is still no formal regulation limiting the duration of residency, leading to many tenants staying for over a decade and even feeling a sense of ownership. Furthermore, regarding the communication role, there is low resident participation in decision-making discussions and suboptimal use of modern communication technologies. Communication is often one-way, which could lead to resistance toward policies.216 PagesSkripsi Sarjan
Determination of the Optimum Concentration of Arabica Coffee Husk Powder (Coffea arabica) and Carrageenan in Boba Production
No full textThis research was conducted to determine the effect of arabica coffee husk powder concentration and carrageenan concentration, as well as their interaction, to produce boba of the best quality. The study used Response Surface Methodology (RSM) randomized with Central Composite Design (CCD) with 2 factors: arabica coffee husk powder concentration (2%; 3%; 4%) and carrageenan concentration (0.7%; 0.8%; 0.9%). The responses tested were moisture content, water absorption, color index (L*, a*, b*, oHue), antioxidant activity, texture profile (hardness, cohesiveness, adhesiveness, gumminess, and chewiness), hedonic value of color, taste, aroma, general acceptability, and hedonic value of chewy texture. The results showed that the concentration of arabica coffee husk powder significantly affected (P<0.05) moisture content, water absorption, color index (L*, a*, b*, oHue), antioxidant activity, hedonic value of color, hedonic value of taste, and general acceptability. The concentration of carrageenan significantly affected (P<0.05) moisture content, water absorption, antioxidant activity, texture profile (hardness, cohesiveness, adhesiveness, gumminess, and chewiness), general acceptability, and hedonic value of chewy texture. The interaction between the concentration of arabica coffee powder and the concentration of carrageenan has a significant effect (P<0.05) on water absorption. The optimization obtained using RSM-CCD resulted in arabica coffee husk powder concentration of 3.992% and carrageenan concentration of 0.900% with a desirability value of 0.818. The optimized sample was then tested, resulting in an ash content of 0,1313%, potassium level of 81,4450 mg/100 g, dietary fiber of 4,2850%, fat content of 0,0677%, protein level of 6,7064%, carbohydrate content of 26,8776%, a total of 134,9453 kcal, and total sugar of 2,5428%.156 PagesSkripsi Sarjan
The Digital Marketing Strategy Of Jims Honey Medan On Instagram For Building Product Brand Image
No full textThis study aims to examine the effectiveness of the digital marketing strategy implemented by Jims Honey Medan through the Instagram platform in building its product brand image. As a visually driven social media platform, Instagram plays a crucial role in digital marketing practices, particularly following the hacking incident of the previous account, which led to the creation of a new account, @jimshoney.offcmedan. This change compelled Jims Honey Medan to restructure its marketing strategy in order to maintain consumer trust and brand presence. The study employs a qualitative method with a constructivist paradigm to understand how digital marketing strategies shape consumer perceptions of brand image through the EPIC Model approach (Empathy, Persuasion, Impact, Communication). Data were collected through in-depth interviews with four informants consisting of digital marketing personnel, a consumer, and a key opinion leader (KOL), and were validated using source triangulation involving an academic informant. The findings indicate that Jims Honey Medan’s digital marketing strategy emphasizes not only visual promotion but also responsive and empathetic communication through content that resonates with the target audience. Informants revealed that the brand image is shaped by consistent engagement, appropriate KOL selection, and communication approaches aligned with consumers’ values and lifestyles. This research provides both practical and theoretical contributions to the development of social media-based digital marketing strategies and enriches the study of digital marketing communication in the context of local fashion industries.138 PagesSkripsi Sarjan
Analysis of Slope Stability with Retaining Wall Using PLAXIS 2D Connect Edition V22 Software on The Sibolangit Road Route
No full textThe study reviewed the slope located in Sibolangit located in Karo regency, North Sumatra with the scope of safety factor, retrofitting was carried out using the application of cantilever type retaining walls. In this study, the approach taken is numerical analysis using PLAXIS 2D CONNECT Edition V22 software, which allows modeling of geotechnical conditions in detail. The background of this study is based on the high risk of landslides in the region caused by the state of the topography of the slope is a steep slope and climate factors with high levels of rainfall. This study includes the collection of soil characteristics data through testing Standard Penetration Test (SPT) and analysis in the laboratory to determine the parameters of Soil Mechanics. From the analysis, it can be seen that the safety factor in the current condition of the slope is 1.249, which indicates that the slope is in an unstable state. After retrofitting with retaining walls, the safety factor value increased to 1.647, thus meeting the safety criteria of a stable slope (>1.5) in accordance with SNI 8460:2017. Based on the results of this study, it can be concluded that the application of cantilever retaining walls is very effective in improving the stability of the slope in the path of Sibolangit road, with the aim of reducing the possibility of landslides and improving the safety of road users. It is expected that this study can serve as a guide in planning and reducing the risk of landslides in other areas that are also vulnerable.144 PagesSkripsi Sarjan
Experimental Study Of Combustion Characteristics And The Effect Of Sugarcane Bioethanol On The Performance Of A Stationary Engine
No full textIncreasing carbon emissions from the transportation sector have driven the search for more environmentally friendly alternative fuels. Sugarcane bioethanol stands out as a potential renewable energy solution, particularly for Indonesia. In this study, I experimentally analyzed the effect of sugarcane bioethanol on the performance and combustion characteristics of a stationary engine. Furthermore, this research compares its performance against commercial gasoline fuels (RON 90, 92, and 98) commonly used in Indonesia. The experiment was conducted on an engine under no-load conditions with speeds varying from 1500 to 4000 RPM, where cylinder pressure and combustion parameters were analyzed using a Kistler data acquisition system. The results indicate that the engine performance using sugarcane bioethanol (RON 95) was highly competitive and showed no significant difference compared to commercial gasoline. Specifically, bioethanol produced a slightly lower peak pressure but exhibited a longer and more controlled combustion duration, which is characteristic of high-octane fuels. The resulting power and torque were comparable, especially at high engine speeds, proving that bioethanol can be used without a meaningful sacrifice in performance. Therefore, it is concluded that sugarcane bioethanol is a highly viable alternative fuel to support Indonesia's energy diversification program towards more sustainable energy sources.98 pagesSkripsi Sarjan
The Effect of Avoidant Attachment Style on Loneliness in Single College Students
No full textThis study aims to examine the effect of avoidant attachment style on loneliness
among single college students. Avoidant attachment style, characterized by an
individual‟s reluctance to form emotional closeness, a tendency to maintain
interpersonal distance, and discomfort with dependence or intimacy, is
hypothesized to have a positive influence on loneliness in single college students.
This research employed a quantitative method with a convenience sampling
technique. The total number of respondents in this study was 899 single college
students from various universities across Indonesia. The instruments used were
the University of California, Los Angeles Loneliness Scale Version 3 (UCLA LS)
and the Experiences in Close Relationships-Revised (ECR-R). The collected data
were analyzed using IBM SPSS Statistics 25. The results showed that avoidant
attachment style had a significant positive effect on loneliness among single
college students, with a contribution of 37.7% (R square = 0.377), while the
remaining 62.3% was influenced by other factors not examined in this study. The
findings of this study are expected to contribute to the development of
psychological support programs focused on interpersonal relationships and the
emotional well-being of university students.137 PagesSkripsi Sarjan
Analysis of Income Risk Oil Palm Plantation for Recipients of Kredit Usaha Rakyat at Formal Financial Institutions (Case Study at Bank X, Universitas Sumatera Utara Branch, Medan City).
No full textOil palm plantation farming has access to government capital through the Kredit Usaha Rakyat (KUR) program. Risk is a crucial issue that needs attention in the context of using credit to avoid negative impacts on both financial institutions and the sustainability of farming businesses receiving KUR. This research aims to analyze the income risk of oil palm plantation farming for KUR recipients at Bank X USU Branch Medan. Data was obtained from Bank X USU Branch Medan by conducting a census of 113 debtors involved in oil palm plantation farming. The research employed descriptive quantitative methods, utilizing the Value At Risk (VaR) and Coefficient of Variation (CV) methods. The research results indicate a potential maximum increase in revenue and a maximum decrease in costs. Furthermore, the risk levels for both revenue and costs are categorized as low, evidenced by a coefficient of variation less than 0.5. Analysis of income risk reveals that if revenue increases and costs decrease by their respective VaR values, there is a potential for income growth. If revenue and costs fluctuate by their coefficient of variation values, an optimistic scenario suggests an increase in debtor income. Conversely, a pessimistic scenario could lead to a decrease in income, though not to the extent of total income loss.101 PagesSkripsi Sarjan
Battery Charging Monitoring and Control With Overcharge Protection Based on the Internet of Things (Iot)
No full textUnsupervised battery charging can pose a risk of overcharging, which can reduce
system performance, efficiency, and safety. This study designs and implements an
automatic battery charging system equipped with Internet of Things (IoT)-based
overcharge protection, with the aim of improving safety and efficiency. The
system utilizes an ESP32 microcontroller as a control center, voltage and current
sensors (ACS712), and a relay as an automatic circuit breaker actuator. Battery
condition data is sent in real-time to the Blynk monitoring application. A 12V 8Ah
battery was tested in the automatic protection system. The test results showed that
the system successfully disconnected charging when the voltage reached 14.25V,
with the charging current decreasing gradually from 2.85A to 0A within 4 hours
25 minutes. In battery charging system II, the voltage increased to 13.82V, with
the charging current decreasing gradually from 2.6A to 0.05A within 4 hours 35
minutes. Likewise with battery charging III, the voltage increases to 14.50 with
the charging current decreasing gradually from 2.90A, to 0.00A in 4 hours 35
minutes. In this third battery test, it is a charging that uses overcharge where the
relay cuts off the current entering the battery when the battery is full.61 PagesKertas Karya Diplom