Sentani Kota Village as a strategic area experiences significant pressure due to population growth and economic activities, facing complex problems including the conversion of agricultural land and forests into residential and commercial areas, low public awareness about sustainable spatial planning, and weaknesses in law enforcement and supervision. This condition potentially threatens the environmental sustainability and ecosystem of Lake Sentani. This study aims to evaluate the suitability of spatial utilization in Sentani Kota Village, Sentani District, Jayapura Regency, focusing on two main issues: the level of conformity between existing spatial utilization and the Regional Spatial Plan (RTRW) guidelines, and the factors that support and hinder the effectiveness of RTRW implementation. Conducting overlay analysis of existing conditions and spatial pattern maps, complemented by field verification at 28 observation points and stakeholder interviews with the Spatial Planning Agency. The results show that 76.5% (2,759.07 hectares) of spatial utilization conforms to RTRW guidelines, while 22.9% (825.98 hectares) remains non-conforming, and 0.6% (21.66 hectares) violates regulations. Supporting factors include routine monitoring protocols, high conformity levels in designated areas, firm enforcement actions, and community leadership involvement. Conversely, hindering factors encompass low public compliance, non-conforming zones prone to violations, inconsistent enforcement responses, various types of violations, limited sanction mechanisms, and inadequate preventive measures. This study recommends targeted enforcement in critical zones, transition planning for non-conforming areas, lake buffer zone management, enhanced community participation, and systematic monitoring protocols to achieve more effective spatial utilization control.

Oil and gas industry activities have the potential to produce high carbon emissions, so Green Open Space (RTH) is needed as an effort to mitigate environmental impacts. Shrub vegetation that grows in RTH areas requires routine maintenance, but this process produces vegetation waste that has not been studied quantitatively. This study aims to analyze the generation of shrub vegetation waste using a sampling method as a basis for sustainable waste management planning. The method used is sampling on a 1 m³ cube-shaped plot in three locations with different vegetation characteristics. Cutting is done manually using simple tools, then the waste produced is put into a measuring box to calculate its volume. The results show that sample point 1 produces 1.00 m³, sample point 2 is 0.50 m³, and sample point 3 is 0.30 m³. The average volume of shrub waste generation is 0.60 m³ per square meter. This data is important for planning the capacity of equipment, labor, and temporary waste disposal locations. In addition, the characteristics of waste that is easy to dry and has a high organic content opens up the potential for reuse as compost or biomass. This method has proven to be effective and efficient in supporting environmentally friendly vegetation waste management strategies as well as part of compliance with environmental regulations such as PROPER.
 
 

In the modern construction industry, accuracy and efficiency in volume calculations are crucial aspects of project success. This study compares two methods for calculating the volume of pile caps and reinforcement: the manual method and the Building Information Modeling (BIM)-based method. The manual method has long been used but has limitations in terms of time efficiency and a higher risk of errors. In contrast, the BIM method offers more accurate and efficient calculations through software-based digital modeling. This study employs a descriptive-comparative quantitative approach by analyzing volume calculation data using both methods. The results indicate that the BIM method has a higher level of accuracy, with a concrete volume of 1,822.87 m³ and reinforcement of 148,862.80 kg, compared to the manual method, which produced a concrete volume of 1,842.17 m³ and reinforcement of 150,279.05 kg. The comparison of pile cap volume calculations shows that the BIM method achieves 98.95% effectiveness in concrete volume calculations and 99.06% effectiveness in reinforcement calculations compared to the manual method. Additionally, the BIM method has proven to be more efficient in reducing calculation time and minimizing input errors. Thus, BIM is more recommended for large-scale projects that require high accuracy and efficiency in construction volume calculations. However, the manual method remains relevant as a validation tool and for small projects with technological limitations. This study highlights the importance of adopting digital technology in the construction industry to enhance productivity and project planning effectiveness.
 
 

An investigation into the building is carried out to determine the suitability and safety of the building and the strength of the structure. The investigations to be carried out include field and laboratory investigations. This is done to determine the feasibility and safety of existing structures. Apart from that, it is also hoped that this investigation can provide recommendations regarding repair or strengthening methods if necessary, referring to the requirements for Structural Concrete for Buildings SNI 2847:2019 and Procedures for Earthquake Resistance Planning for Building and Non-Building Structures SNI 2847:2019. From the results of structural testing using UPV and Hammer Test, it was found that the structural system is an open frame consisting of plates, beams and columns using concrete material, while the joists use steel plinths. The reinforcing steel used uses plain iron U40 as flexible reinforcement with shear reinforcement with U24. The quality of concrete obtained respectively for column f'c 25 MPa, beam f'c 22 MPa and floor slab f'c 22 MPa. Based on the results of the floor leveling survey to record the potential for building subsidence or floor sagging using a water level, it was concluded that there was no slope found in the building as a whole. The deflection that occurs is local and relatively flat. To meet the requirements, strengthening was carried out by increasing the dimensions of the columns and beams, adding plates to the steel profiles on the flange and web.

Terminals serve as transportation nodes that play a vital role in supporting community mobility and urban economic activities. As the capital city of Papua Province with a population of 420,577 inhabitants, Jayapura City requires an efficient transportation system to support increasingly dynamic social and economic activities. Entrop Terminal, as a Type A Terminal and the main transportation hub of Jayapura City, serves various transportation modes ranging from inter-city inter-provincial transport, cross-border transport, intra-provincial inter-city transport, urban transport, to rural transport. However, there is a significant problem where users prefer to wait for public transportation outside the terminal due to long queues inside the terminal, creating a shadow terminal phenomenon. This research aims to evaluate the facilities available at Entrop Type A Terminal in relation to the quality of services provided to users. This evaluation is important to identify facility and service deficiencies that cause users to be reluctant to use the terminal optimally. The research results are expected to provide recommendations for facility improvements and service quality enhancement at Entrop Terminal, so that it can function optimally as the main transportation hub and reduce the shadow terminal problems occurring in Jayapura City.

The buffer zone of BJ. Habibie Grand Forest Park (Tahura) in Bihe Village, Asparaga District, plays a strategic role in balancing environmental conservation and community agricultural activities. However, the widespread practice of monoculture corn farming and land clearing through burning threatens ecosystem sustainability and accelerates environmental degradation. This study aims to analyze farmers’ perceptions of buffer zone management and to identify the challenges and potential for transitioning to sustainable agricultural systems. A descriptive qualitative and quantitative approach was used through field observations, in-depth interviews, questionnaires, and document analysis. The findings indicate that most farmers possess basic awareness of the importance of conservation areas, but there are notable knowledge gaps regarding regulations and environmentally friendly practices. Although some farmers acknowledge the negative impacts of land burning and monoculture, economic limitations, inherited customs, and lack of technological support remain significant obstacles. Nevertheless, respondents expressed a high willingness to change their farming practices if provided with training and incentives. This study recommends a participatory strategy involving government bodies, conservation institutions, and academics to build farmers’ capacity and promote the adoption of sustainable agricultural technologies. A collaborative approach that considers the socio-economic realities of local communities is essential to ensure the long-term sustainability of the BJ. Habibie buffer zone without compromising farmers’ welfare.

Time Schedule is used as a guide and control tool for work execution time and productivity of workers, work tools on the project. In terms of productivity control, there are several aspects involved in the monitoring system, such as materials, tools, resources, and scheduling of project activities. Scheduling is the arrangement of resources to complete tasks in achieving targets. by involving components of activities, and time, In order to determine the optimal scheduling and budget. in accordance with time and cost limitations, this study uses the PDM (Precedence Diagram Method) method and the Crashing method through alternative scheduling with the addition of overtime of 1 hour, 2 hours, and 3 hours and knowing the acceleration cost. for each alternative. The results of the acceleration alternative with optimal costs are, alternative 1 adding 1 hour of overtime, the total cost decreased by 0.19% to Rp 3,067,337,201, -. This means that alternative 1 saves costs of Rp 5,984,598, - and is estimated to be one day faster to 119 days.

Hiripau Village, inhabited by the Kamoro ethnic community, exhibits housing conditions that do not meet the basic infrastructure standards for livable settlements. This study aims to identify the characteristics of housing facilities and infrastructure, as well as to formulate a development strategy for the area. A qualitative descriptive method was employed, utilizing field observation, in-depth interviews with local residents and traditional leaders, and documentation of existing conditions. The findings indicate that basic infrastructure components such as neighborhood roads, clean water supply, sanitation systems, drainage, and waste management are in inadequate condition. Therefore, the study recommends an integrated planning approach for infrastructure improvement, emphasizing active community participation in the management and maintenance of the residential environment to achieve a habitable and sustainable settlement.

Remote islands in Indonesia face significant challenges in achieving sustainable electricity supply. This study analyzes the technical and economic feasibility of implementing a hybrid Solar Power Plant (PLTS) and Wind Power Plant (PLTB) system on Dudepo Island, North Gorontalo Regency. With an average solar radiation of 5.2 kWh/m²/day and wind speed of 4.8 m/s, the hybrid system is designed to supply approximately 97% of local electricity demand with an efficiency of 85%. Simulations using HOMER Pro reveal an optimal configuration of 100 kW PLTS, 60 kW PLTB, and 300 kWh battery storage. Economic analysis indicates a Levelized Cost of Energy (LCOE) of IDR 1,450/kWh, more affordable than conventional diesel generators, with an eight-year payback period. The system’s implementation has enhanced community well-being by providing stable electricity access for education, healthcare, and economic activities. Moreover, it contributes to carbon emission reduction by up to 120 tons of CO? annually. Technical challenges and local human resource capacity necessitate sustainable management strategies, including technician training and IoT-based monitoring systems. This study offers recommendations for sustainable renewable energy development on remote islands as a model for environmentally friendly energy transitions.

The selection of building materials is vital for the development of high-quality infrastructure and residential projects. The two most commonly used building materials are red bricks and lightweight bricks. This study compares the productivity and cost of red brick and lightweight brick production and installation in construction projects. Data were obtained through direct observation, worker interviews, and Value Engineering analysis on the Shopee Semanggi Housing Project, which consists of 136 houses with a total estimated budget (RAB) of Rp10.93 billion. The results show that red brick installation productivity is 3.3 m²/day, while lightweight brick installation reaches 17.9 m²/day. The installation cost for red bricks is Rp1.52 billion for 12,786.78 m², compared to Rp1.62 billion for lightweight bricks for the same area. This study provides guidance for selecting building materials based on time and cost efficiency.