Direktori jurnal elektronik Politeknik Negeri Padang (PNP)
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Analisis Efektivitas Thermal Insulation pada Sekat Ruang (Bulkhead) Bus untuk Mengurangi Panas Mesin
No full textThis study aims to evaluate the effectiveness of two types of thermal insulation materials, namely polyurethane (PU) foam and basaltwool, in reducing heat transfer from the engine compartment to the passenger cabin through the bus bulkhead structure. Optimal thermal insulation is essential to maintain cabin thermal comfort and enhance safety within the vehicle interior. The testing methods included measurements of thermal conductivity and evaluations of each material’s resistance to extreme temperatures. The results indicate that PU foam exhibits lower thermal conductivity (±0.020–0.028 W/m·K) and achieves heat retention efficiency of 95–98% at temperatures around 100°C. On the other hand, basaltwool shows slightly higher thermal conductivity (±0.035–0.040 W/m·K) with efficiency ranging from 90–95%, but significantly outperforms in terms of heat resistance, withstanding temperatures as high as 600–1000°C. Based on these findings, PU foam is considered more suitable for applications that require thermal efficiency at moderate temperatures, while basaltwool is better suited for environments exposed to continuous high temperatures. Therefore, the appropriate selection of insulation material should be based on specific operational conditions to optimize both thermal comfort and cabin safety
Instructed Second Language Acquisition in Chinese as First Language English as Foreign Language in Secondary Schools
Full text linkIn the field of second language acquisition, there have long been theoretical divisions and practical disputes between explicit and implicit instructions. Explicit instruction focuses on rule explanations but neglects language application, while implicit instruction emphasizes natural acquisition but lacks systematism. In order to complement the advantages of the two teaching methods, this study attempts to propose an integrated framework of implicit and explicit instructions based on Ellis's instructional model (2024), consisting of four parts: integration of teaching objective, integration of teaching content, integration of methodology, and integration of assessment. The current study tries to bridge the gap between explicit and implicit teaching approaches for effectively enhancing the teaching efficiency of foreign language classes in secondary schools. This current study provides a new theoretical perspective for the study of second language teaching approaches and offers an operational implementation path for classroom teaching practice. In the future, its applicability in different contexts can be further verified through empirical research
Food for Thought: A Gricean Pragmatic Analysis in the CSPC Canteen
Full text linkThis study explores the everyday conversations between vendors and customers in the Camarines Sur Polytechnic Colleges (CSPC) canteen, focusing on how these interactions follow or break Grice’s Conversational Maxims. It also looks at the conversational implicatures that emerge during these exchanges. Using a qualitative approach, the researchers analyzed recorded dialogues to identify recurring communication patterns. Although many studies have explored Grice’s theory in formal or classroom settings, few have applied it to real-life, transactional environments like school canteens. This research fills that gap by showing how ordinary conversations reflect or challenge key principles in pragmatics. The findings help explain how meaning is created, negotiated, or implied in routine interactions, thereby offering insights into how language works in practical, day-to-day situations
Perencanaan Rencana Anggaran Biaya RumahTinggal dengan Pendekatan Inovatif di Kota Kendari
Full text linkKendari is the capital city of Southeast Sulawesi Province which administratively has 11 sub-districts and 65 villages. In 2023, the population of Kendari City reached 351,051 people which is increasing from year to year. This increase in population causes the need for houses as a basic need for housing for the community to also continue to increase from year to year. The house as a residence is certainly the key to the comfort and safety of its inhabitants. This comfort and security cannot be separated from efficient and effective house construction planning so that these goals can be achieved properly. The purpose of this research is to obtain detailed specifications of innovative implementation methods and materials that can make the construction of residential houses with a Budget Plan (RAB) that becomes effective and efficient and prioritizes aspects of quality and high quality. The data studied in this research is a residential house with an area of 7m x 9.5m located in Kendari City, Southeast Sulawesi Province. The results obtained are the calculation of the Cost Budget Plan (RAB) of Rp318,419,000 and the innovations applied to achieve the effectiveness and efficiency of residential construction, namely the calculation of the quantity of work items by prioritizing good waste management aspects, the use of high-quality products, casting using mini ready mix concrete with maintained quality, and innovative use of technology such as SketcUp 3D and Microsoft Project for efficient project execution and scheduling methods
Kajian Disrupsi Pada Transportasi Umum (Angkot) Di Kecamatan Nanggalo,Kota Padang Dengan Metode Importance Performance Analisis
Full text linkThis study aims to analyze the impact of disruption caused by the development of online transportation on public minivans (angkot) in the Nanggalo District, Padang City, and to assess changes in public interest in choosing urban transportation modes. Disruption refers to innovation that replaces existing systems with new methods, and this phenomenon is also occurring in spatial planning in Indonesia, particularly in the transportation sector. In recent years, angkot, as a primary mode of transportation, has experienced a decline in passenger numbers and fleet size due to the emergence of online transportation applications such as Gojek and Grab. The methodology employed in this research is Importance Performance Analysis (IPA). The findings indicate that 73% of respondents prefer using online transportation, leading to a 48.67% decrease in angkot passengers. The average frequency of angkot operating during peak hours is recorded at only 3 vehicles per hour for the Pasar Nanggalo – Lapai route and 5 vehicles per hour for the Pasar Nanggalo – Gunung Pangilun route. Furthermore, the load factor for the Pasar Nanggalo – Lapai route is 41.67%, while for the Pasar Nanggalo – Gunung Pangilun route, it is 48.61%. The average waiting time for angkot on the Pasar Nanggalo – Lapai route is 13 minutes, whereas for the Pasar Nanggalo – Gunung Pangilun route, it is 7 minutes. This study recommends enhancing the quality of angkot services, including more regular scheduling, improved cleanliness, and increased comfort during trips. Additionally, it is crucial for local governments to formulate policies that support the sustainability of angkot through driver training programs and innovations in public transportation systems. By doing so, it is expected that angkot can adapt to technological advancements and meet the evolving needs of the community
Perancangan Mesin Perontok Padi Dengan Sistem Rotari
Full text linkRice is one of the staple foods consumed by the people of Indonesia, including the Bangka Belitung Islands Province, more precisely in Bangka Regency, Riau Silip District, Banyu Asin Village. Newly harvested rice is usually not yet separated from the straw/panicle. The rice harvesting process still uses traditional tools or also called gebotan. One example is the rice threshing machine in Banyu Asin Village which has not been able to maximize the threshing results, which results in a long threshing process. The machine is only capable of threshing 30 kg/hour of rice that is put into the machine. Based on these needs, a rice threshing machine design was made to facilitate the threshing process. The design of the rice threshing machine refers to the design method, namely: planning, conceptualizing, designing, and finishing, then assessed based on technical and economic aspects. The designed machine uses a rotary system to thresh rice from its stalks, uses a combustion engine as a driving system, pulleys and belts as transmission elements, and the machine can be moved because it is lighter than existing machines. From the design results, this rice threshing machine has a minimum capacity of 80 kg/hour
Identifikasi Root Cause Produk NG Master Cylinder di PT X
No full textThe braking system is a crucial component in vehicles, responsible for reducing speed or halting the vehicle safely. However, several technical issues, such as brake fluid leakage, can compromise braking performance. Leaks can occur in hydraulic lines, the master cylinder, or brake calipers, leading to reduced hydraulic pressure and ineffective braking. Other issues like wear on components, excessive heat causing fading, and corrosion or contamination of brake fluid further degrade braking performance. The master cylinder plays a vital role in converting mechanical pressure into hydraulic pressure to operate the brake caliper. Damages such as fluid leaks, wear, corrosion, or contamination can impair this function, increasing the risk of accidents. Factors contributing to failures include poor material quality, machine setting errors, and inadequate maintenance. Regular inspection and maintenance of these components are essential to ensure vehicle safety and optimal braking performance
Analisis Coefficient of Performance (COP) dengan Pemanfaatan Energi Panas Discharge Kompresor Sistem Heat Exchanger Double Tube pada AC 1 PK untuk Pemanas Air
Full text linkHot water has become an important part of everyday life. Utilization of waste heat is increasingly relevant in the modern era, due to very significant technological advances. One of them is the refrigeration system which regulates temperature by transferring heat energy from inside to outside the room. Basically, this heat can be used to heat water by absorbing heat before it reaches the condenser. Reusing waste heat from the condenser can save the electricity needed to heat water, making it an efficient way to utilize wasted energy. This research aims to determine the effect of variations in HE (heat exchanger) pipe length on the performance of the Coefficient of Performance COP, and the required electrical power consumption using heat exchanger calculation analysis for the CoolPack application. This research uses an experimental method on a 1 PK split AC with variations without a heat exchanger and with a 3 pass, 5 pass double tube heat exchanger. The results of this research show that without a heat exchanger the average COP is 3.68 and the electric power is 0.063 kWh, with a 3 pass heat exchanger the average COP is 4.1 with an increase of 11.4% from the data without using a heat exchanger and an electric power of 0.054 kWh, with a 5 pass heat exchanger the average COP is 4.66 with an increase of 26.6% from the data without using a heat exchanger and an electric power of 0.052. kWh. This shows that the better the heat dissipation in the condenser, the greater the heat absorbed by the evaporator, making the COP higher and the compressor work lower. Therefore, the use of electrical power is lower and the performance of an Air Conditioning system is more efficient
Analisis Stabilitas dan Perbandingan Metode Perbaikan Longsor Ruas Jalan Barung-Barung Belantai KM. 45+400, Pesisir Selatan
Full text linkThe Barung-Barung Belantai road section is located in Pesisir Selatan Regency, West Sumatra. The area is dominated by steep hillsides that are prone to landslides. The types of slope reinforcement used are Gabion, Cantilever Retaining Walls and Sheet Piles. This study aims to calculate the slope safety factor value using the slice method, analyze slope reinforcement against the safety factors of overturning, sliding, soil bearing capacity and calculate the cost and time of the work. Based on the calculation of slope stability, the slope safety factor (Fs) value is 0.8569, overturning is 0.971, and the soil bearing capacity value is 0.996. These values indicate that the slope condition is classified as unstable because all safety factor values (Fs) are below 1.25, which is the safe limit. Based on this analysis, this study recommends the use of a 4-meter high cantilever retaining wall as a repair solution. The calculation results show that this wall has a safety factor (Fs) against shear of 4.920, overturning of 2.003, and soil bearing capacity of 4.730, including the safe category and meeting technical criteria. It is concluded that the cantilever wall is more efficient than the gabion and sheet pile methods. The construction of the cantilever wall requires a budget of Rp. 522,259,000 with a working time of 14 weeks. As a comparison, the construction of the gabion structure costs Rp. 560,974,000 with a work duration of 11 weeks, while the sheet pile costs Rp. 629,578,000.- with a work time of 10 weeks
Demystifying Students' Observance and Violation of Gricean Maxims in Online ESL Classes
Full text linkThe Gricean maxim construct remains a focal point of linguistic research today. According to Bakoko & Pratiwi (2021), the Cooperative Principle is one of the central guidelines facilitating effective language learning. Language teachers must understand how students communicate and the issues they encounter. This study examines conversations between teachers and students in online ESL classes, focusing on students' observance and violations of Gricean maxims and the implicatures drawn from their utterances. Using a qualitative research design, the researcher transcribed five recorded synchronous ESL discussions in a higher education institution. The transcribed conversations were analyzed to determine observance or violation of Grice’s maxims. Findings indicate that students violated all Gricean Maxims—Quantity, Quality, Relevance, and Manner—during interactions. The maxim of Manner was the most observed, while the maxim of Quantity was the most frequently violated. Interestingly, the maxim of Quality showed no violations across the 48 conversations analyzed. The study suggests that implicatures resulting from violations could be leveraged to enhance pedagogical strategies