Barometer

CONCEPT DESIGN OF FIREFIGHTING SYSTEM DRY CHEMICAL POWDER BALL THROWING TYPE ON DRONES PT. CI

Riky Adhiharto — 2024-02-01

Fire is an emergency condition that does not know the situation or time when it can occur and is difficult to control which can cause material loss and life safety. In a fire there is what is called the Flammable Range, which is the limit between the minimum and maximum concentration of a mixture of fuel vapor and air (oxygen) which can explode or ignite at any time if a heat source is provided. Range, place, time and security factors are the main causes of the difficulty of the fire control process. In order to help and simplify the process of extinguishing fires, a tool was developed that can be used in fighting fires. This tool is expected to be able to throw a ball-shaped type of dry chemical powder fire extinguisher, because it is faster and more effective for extinguishing fires in tall buildings so that the fire does not spread and cause more fatal damage. This tool is called a firefighting system, which utilizes drone or Unmanned Aerial Vehicle (UAV) technology. Drones and firefighting systems are flown to reach high places, avoid obstacles, and can fly long distances with the aim of minimizing risks that threaten safety in controlling fires. This research uses the VDI 2222 (Verein Deutsche Inginieuer 2222) design method, starting with problem identification, selecting alternative concept variations, determining component specifications, construction calculations and detailed design. Alternative Variation Concept 1 was obtained as the selected design concept, with a score of 420 (84%) for the Technical Assessment and a score of 360 (72%) for the Economic Assessment. This fire fighting system has installation dimensions on the drone of 600x600x400 mm, the weight of the tool and 3 balls is 12 kg, the throw distance is 5.05 m, the initial speed is 15,6604 m/s, the target can be at a height of 9,512 m.

ENHANCING USER EXPERIENCE: DESIGNING JUWANA APP INTERFACE WITH USER CENTERED DESIGN APPROACHD

Surya Saputra Surya Saputra — 2024-02-13

Fast and stable internet access has become an essential requirement in daily activities. To meet this need, subscribing to internet packages has emerged as a viable solution. Therefore, the development of a user interface (UI) for a mobile application that facilitates internet package subscriptions is crucial. This study aims to design the user interface of a mobile application called Juwana, which allows users to easily purchase internet subscription packages and enhance user satisfaction. The User Centered Design (UCD) method was employed in this research. The UI design of the Juwana application was developed by analyzing user requirements, designing solutions based on those requirements, and conducting usability testing using Maze and the System Usability Scale (SUS). The results of this study present the design of the Juwana application's user interface, consisting of 13 interfaces. Maze testing indicated that all testing scenarios yielded the expected outcomes. The SUS testing results showed that the Juwana application design prototype obtained an average score of 75.7 with a grade scale of C, a Good adjective rating, and fell within the Acceptable category. Based on the findings and discussions of this research, it can be concluded that the user interface design of the Juwana application, developed using the User Centered Design (UCD) method, meets user needs and preferences. The design facilitates the process of purchasing internet subscription packages and enhances user satisfaction.

DESIGN AND SELECTION OF COMPETITIVE STRATEGY IN PT. ELNOV DWIATA MANDIRI WITH SWOT METHOD AND COMPLEX PROPORTIONAL ASSESSMENT

Mohammad Akbar — 2024-01-31

Elnov Dwiata Mandiri is a Company engaged in electrical maintenance servies. This company operates on a project basic where the process is carried out if there is a request by a service user or client. This company is a company with project model that must have high adaptation and respond to the surrounding environment. Therefore, the argument is strengthened tha existence of strategic planning is an important topic. This research was conducted with the aim of knowing internal and external environmental factors using the IFE and EFE matrices and looking for alternative strategies using the SWOT matrix and determining competitive strategies based on appropriate criteria using Complex Proportional Assessment (COPRAS). The results showed that IFE matrix value was 3,18 and the EFE matrix value was 3,69. If depicted in the IE matrix, the company’s condition is in quadran I, which means a build and growth strategy to improve good relations with distributors and suppliers, and improve the structure company. Strategy by improving the quality of Operatonal HR is the best alternative strategu to be implemented at PT. Elnov Dwiata Mandiri with a utility values of 100%. This strategy is the most appropriate to implement so that human resources are more productive at work and to create positive changes for emloyees

CORRELATION BETWEEN AGES AND WORK DURATION WITH LOW BACK PAIN INJURY ON EMPLOYEE OF PT JAKARTA INDUSTRIAL ESTATE PULOGADUNG

Nur Yulianti Hidayah — 2024-02-13

Office workers are a form of work that is at high risk of experiencing complaints or musculoskeletal disorders (MSDs). Low Back Pain (LBP) is one of the most common MSDs problems, many workers experience symptoms of lower back pain while working. LBP disorders have various risk factors, including individual, occupational, and environmental factors. Several employees of PT. JIEP feels pain in the back to the buttocks. These complaints can cause movement and daily activities to be disrupted. This study aims to determine the correlation between age and length of work on LBP complaints among PT. JIEP using the Multiple Linear Regression. Data was obtained by distributing questionnaires to employees of PT. JIEP has 35 people aged 21-30 who work in the HSE, Legal, HCM, IT, Maintenance, and Finance departments. The results of analysis show that the age variable (X₁) has no partial relationship to LBP complaints (Y). Whereas in the length of work variable (X₂) there is no partial relationship to variable Y. F test states that the variables X₁ and X₂ together have no relationship with the variable Y which is shown in the F test with a F_count value of 0.734 <F_table 3.29. Based on the value of R² = 0.044, it is known that age and length of work affect LBP complaints by 4.4%. From the results of the questionnaire identifying the factors that cause LBP complaints, it is known that there are two factors, namely work body posture (54.3%) and psychology (45.7%).

INTERNET OF THINGS-BASED AIR QUALITY ANALYSIS FOR MONITORING CO2 CONCENTRATION IN ROOFTOP BUILDING AREAS

R Deasy Mandasari — 2024-01-31

This research aims to comprehend the air quality in rooftop areas in the city of DKI Jakarta, renowned for its high population density and rapid infrastructure development. The main focus is on the concentration of carbon dioxide (CO2) in the roof area, serving as an indicator of air quality influenced by air pollution, industrial activity, and heavy transportation. The utilization of Internet of Things (IoT) technology and CO2 sensors proves to be an effective solution for real-time monitoring of CO2 concentrations. This research holds significance for air pollution control measures, providing insight into the impact of rooftop gardens in reducing CO2 emissions and inspiring future research in the realms of air quality and IoT technology. Through prior literature, three notable studies underscore the industrial and technological impact of CO2 monitoring. The research was conducted in two locations in DKI Jakarta, namely the Garden Roof and Ordinary Roof areas. Monitoring took place over four parts of the day with a four-hour interval to compare CO2 levels. The tools employed included the NodeMCU ESP8266, DHT-22 sensor, and MQ-135 sensor. Results revealed that roof areas with gardens exhibited lower average CO2 levels (295 PPM) compared to regular roofs (360 PPM), indicating the potential of garden roof designs to reduce CO2 concentrations. Research recommendations include increasing the frequency of data collection and considering additional factors for a more comprehensive understanding of urban air quality.

CHARACTERISTIC ANALYSIS OF CANDLENUT OIL METHYL ESTER (BIODIESEL) AS AN ALTERNATIVE BIO ADDITIVE TO LOWER THE POUR POINT OF CPO BIODIESEL

Misdawati Misdawati — 2024-01-31

One of the drawbacks of Crude Palm Oil (CPO) biodiesel is that it has a high pour point which causes disadvantages in its use. The objective of this research was to obtain biodiesel of low pour point by mixing CPO biodiesel with Candlenut biodiesel with various ratios among them. In this research, the effect of biodiesel composition, and the type of biodiesel in the mixture were evaluated in order to obtain the best combination of the biodiesel in the mixture. The influence of polyunsaturated such as linolenic derived from candlenut oil was also evaluated. The result of the research showed that when the amount of the Candlenut biodiesel increased in the mixture the pour point decreased. When the ratio between CPO and Candlenut biodiesel was 80:20, the product had an optimal pour point of – C. In fact, .the number of double bonds present in linolenic acid had a more significant effect on the quality of biodiesel produced than the length of the fatty acid chain.

BIODELIGNIFICATION OF AGRO-INDUSTRIAL WASTE AS THE SUBSTRATE TO PRODUCE LACCASE ENZYME FROM TRAMETES VERSICOLOR

Meka Saima Perdani — 2024-02-01

Agro-industrial waste in Indonesia is a significant problem for the environment. Optimization of agro-industrial waste utilization is an exciting thing to be researched further. This study aims to utilize agro-industrial waste to optimize laccase enzyme production. The agro-industrial waste used is in the form of bagasse, rice straw, and corn stalks. The waste is used as biomass and treated to extract cellulose through bio-delignification. Cellulose serves as a substrate substance in the production of laccase enzymes. Laccase enzymes can be applied as a biocatalyst in the environmental, pharmaceutical, and chemical industries. Cellulose from agroindustry waste was synthesized by heat treatment using steam explosion with the operation conditions 200°C and 10 bar for 10 minutes. The production of laccase enzymes was done using the green technology submerged fermentation method for 32 hours at 25°C. The optimal result in producing laccase enzyme is using substrate from corn stalks and adding nutrients with an activity value of 25.46 U/mL. The reaction kinetics of laccase enzyme and commercial enzyme against 0.1 M substrate were modelled using the Euler method, and the k value was 2x10^-4 min^-1 (crude laccase) and 1.9x10^-2 min^-1 (commercial laccase).