Analysis of Potential and Feasibility of Hydropower Energy from Sepaku Semoi Dam in Penajam Paser Utara Regency

This paper will present a techno-economic potential and feasibility analysis in the planning of renewable hydropower energy from Sepaku Semoi Dam in Penajam Paser Utara (PPU) Regency. The dam was planned to be built to support the water needs of Indonesia’s prospective capital. The analysis was done based on the last twenty years’ rainfall intensity data history from Sepaku rain station and Sepinggan rain station and digital elevation model (DEM) from DEMNAS with support of the river basin agency of Kalimantan Timur. The result of dependable discharge calculation of Sepaku Semoi river using FJ Mock Method is 2.45 m/s2. And the head of the hydropower power plant is 15.85 meters. The total potential electricity generated from hydropower reached 2,593,140 kWh/year. The assessment of feasibility indicators in this research took into account the technology and economic aspects. The technology aspects help evaluate the technical planning of installations that are possible to build in the dam. The economic aspect of feasibility evaluates the net present value (NPV), internal rate of return (IRR), and the payback period of renewable energy installation. This analysis aimed to get a comprehensive insight from the potential hydropower energy that exists at the research locations and conduct a feasibility study based on techno-economic analysis to develop renewable energy. The results showed that 15.85 meters had the most significant potential of hydropower by generating 290 kW continuous power with a feed-in tariff of 0.054 USD/kWh. The electricity was feasible to offer to the government electrical company. Moreover, this project had a payback period of 8 years, and NPV of 64,005 USD, and an IRR Project of 11.86%.

A Tale of Two Bridges: The Poetry and Politics of Infrastructure in Nineteenth-Century Wales

Drawing on Brian Larkin’s concept of ‘infrastructural poetics’, this article considers and compares a selection of English- and Welsh-language poems, by writers including Eliza Mary Hamilton, Frederick Faber, Richard Llwyd, and Eben Fardd, about two nineteenth-century infrastructures that transformed North Wales and Great Britain’s relationship to Ireland: the Menai Suspension Bridge (1826), and the Britannia Tubular Bridge (1850). I argue that these non-canonical poems complement perspectives derived from parliamentary records, official reports, technical planning documents, scientific manuals, and journalism, enhancing our understanding of the nineteenth-century infrastructural imagination. Specifically, building on the association of infrastructural development and modernity, I explore how the poems under discussion participate in nineteenth-century negotiations about Wales’s place and future in the United Kingdom, and how these negotiations evolved between 1819 and 1852. I show that, although Wales was the site of impressive engineering feats and accelerating industrial extraction, English-language poems present the Menai Bridge in picturesque terms, drawing on popular images of the Celtic fringe that evoke timeless, ideal beauty. Anglophone verse about Britannia Bridge, by contrast, focuses explicitly on the infrastructure’s technological modernity but claims it as an English landmark. Both strategies, I suggest, effect an erasure of Wales – as a distinct cultural and political entity – from a future conceived as Anglo-British. Poems written in Welsh, and the work of Welsh writers in English, complicate this picture, not because they reject British nationalism and imperialism, but because they seek to embed a modern Welsh nation more centrally within those political and ideological frameworks.

Barriers to the Implementation of Sustainable Construction: Government Perspective

Sustainable construction is a way for the construction industry to achieve sustainable development by considering social, economic, environmental, and cultural issues. Policies for implementing sustainable construction in infrastructure delivery are still not clearly understood, resulting in challenging implementation by planners and contractors. This research study identifies the barriers to implementing sustainable construction in developing infrastructure projects in Bina Marga, Cipta Karya, Sumber Daya Air, and Perumahan Permukiman sectors in North Sulawesi Province. Data collection using semi-structured interviews involved 23 informants from these four sectors. The results of the study found that the barriers evenly occur throughout the life cycle of an infrastructure project in four sectors, namely: (1) the programming phase related to strategic planning documents and identification of barriers, (2) the technical planning phase related to technical understanding and competence service providers, (3) construction implementation phase related to expert consultants, service provider competence, and green construction technology, (4) utilization phase related to socialization, promotion, and education, (5) demolition phase related to mechanisms and availability of resources. The study results provide academic-based information for the government to minimize barriers to implementing sustainable construction policies throughout Indonesia.

Evaluating Explainability Methods Intended for Multiple Stakeholders

Explanation mechanisms for intelligent systems are typically designed to respond to specific user needs, yet in practice these systems tend to have a wide variety of users. This can present a challenge to organisations looking to satisfy the explanation needs of different groups using an individual system. In this paper we present an explainability framework formed of a catalogue of explanation methods, and designed to integrate with a range of projects within a telecommunications organisation. Explainability methods are split into low-level explanations and high-level explanations for increasing levels of contextual support in their explanations. We motivate this framework using the specific case-study of explaining the conclusions of field network engineering experts to non-technical planning staff and evaluate our results using feedback from two distinct user groups; domain-expert telecommunication engineers and non-expert desk agent staff. We also present and investigate two metrics designed to model the quality of explanations - Meet-In-The-Middle (MITM) and Trust-Your-Neighbours (TYN). Our analysis of these metrics offers new insights into the use of similarity knowledge for the evaluation of explanations.

Potential and Feasibility Analysis of Biomass Energy from Palm Oil Mills on North Penajam Paser Regency Region

This paper would present a techno-economic potential and feasibility analysis in the planning of renewable energy from palm oil mills on the North Penajam Paser Regency. The analysis was done based on the last three-year production data history of 7 (seven) palm oil processing factories in the region. The total fresh fruit bunches processed were about 891.624 tons/year. The total potential electricity generated from palm oil residue reached 28.009 kWh. This analysis aimed to get a comprehensive insight from the potential biomass energy that exists at the research locations and conduct a feasibility study based on techno-economic analysis to develop renewable energy of new state capital Indonesia and the supporting regions. The technology helps evaluate the technical planning of installations that are possible to build in the area. The economic aspect of sustainability evaluates the net present value (NPV), internal rate of return (IRR), and the payback period of renewable energy installation. The results showed that North Penajam Paser Regency could generate 78,927,223 kWh in a year with a feed-in tariffs is 1,223.481 IDR/kWh. The electricity was feasible to offer to the government electrical company. Moreover, this project had a good NPV and IRR for private investors.

AUTOMATION OF DEVELOPING PLAN FOR EXTRA-CURRICULAR ACTIVITIES USING INTELLIGENT INFORMATION TECHNOLOGIES

The article analyzes the problem of organizing extracurricular activities, which, along with the organization of the learning process, is important in modern education characterized by the person integrated development and individualization of training and education programs. The important problems need to be addressed at various stages of the organization of extracurricular activities, from its methodological study to organizational and technical planning. There has been offered a review of the directions of extracurricular activities, the forms in which it can be organized, as well as the specifics of its implementation at various levels of education. In order to reduce the complexity of time costs, ability to choose forms of extracurricular activities in suitable areas, taking into account the time available for its implementation, as well as the ability to generate plans based on individual preferences, an intelligent information system has been developed. A mathematical model of method optimization aimed to solve the problem of decision support, functional and software-architectural models of the developed web service and examples of its work at various stages of generating the extracurricular activities plan in the optimization statement have been presented. The proposed approach can be widely used in the educational institutions of various levels interested in reducing the costs of organizing extracurricular activities, automatic check for compliance with the requirements of the Federal State Educational Standard and generating a working plan taking into account the opinions of various categories of experts.

Technical Planning of Ventilation System to Support Development W Undercut in 2021 at PT. Freeport Indonesia Underground Mining

Ventilation is an attempt to drain clean air into the mine and remove dirty air out of the mine. The main components of a mine ventilation system are intake, working, and exhaust. Intake is a tunnel and wells system where air flows from the surface into the mine. The purpose of the ventilation system in an underground mine is to provide and drain clean air into the mine for breathing and comfort of mine workers. Based on the Ventilation Design Criteria used by PTFI, the minimum airflow level required for every mine worker is 0.033 m3 / s / worker. Based on PTFI Ventilation Design Criteria, the minimum level in diluting smoke of heavy equipment diesel engine is 5 m3 / min or 0.08 m3 / s / kW. PT Freeport Indonesia is currently developing new underground mines namely Grasberg Block Caving (GBC) and Deep Mill Level Zone (DMLZ) which will be mined using the block caving method.

ANALISA REKAYASA SIFAT MEKANIK BAJA AISI 4140 DENGAN VARIASI SUHU TEMPERING UNTUK MENINGKATKAN KEULETAN DAN KEKERASAN MATERIAL

Steel is a type of material that is widely used as a main material in the manufacture of various kinds of industrial and automatic machinery spare parts. Some mechanical properties of steel that are often used in design are hardness, ductility and toughness. Often in a design, we have difficulty getting steel with mechanical properties that are appropriate with the design. For this reason, engineering carried out mechanical properties engineering, to obtain steel in accordance with design calculations. AISI 4140 steel is a medium alloy steel. This steel is often used for industrial and automotive machinery parts. This research engineered the mechanical properties of the steel, namely the hardness and ductility of the material. The process is carried out by conducting steel hardening at 850 °C followed by rapid cooling with water media. After that, tempering at temperatures of 300 ᵒC, 400ᵒC and 500ᵒC by cooling together with the furnace. The result is hardness and tensile strength of the material has increased, when compared with untreated material. This method is effectively used to obtain mechanical strength values in accordance with technical planning calculations. . Keywords: Tempering, AISI 4140, Mechanical Properties Engineering

Package Sectoral Order as an Effective Tool for Managing Import Substitution, Development of New Technologies and Energy Modernization

Import substitution in the energy sector requires development in Russia of a group of new industries and modernization of existing capacities. That calls for integrating the structures of fundamental and applied science, education, power engineering production, energy generation and electricity transport in the framework of a complete innovation cycle. The key to the problem solution is forming an integrated mechanism for planning and management of scientific-research, power engineering and electric power segments as parts of a single technological chain of work and procurement from basic research to equipment disposal. The R&D result should be a package sectoral order for equipment and technologies — a new planning and coordination tool in the market environment of Russian energy and power engineering. It is proposed to build a new information control loop in the energy sector of Russia to form the basis of a package order within the industry in order to establish medium- and long-term scientific and technical planning for replacing retiring equipment, tracking contracts and monitoring results of their implementation.