Tingkat Kesegaran Jasmani Pada Siswa Ekstrakurikuler Bola Voli di SMPN 34 Kota Pekanbaru

The purpose of this study was to determine the level of physical fitness of volleyball extracurricular students at SMPN 34 Pekanbaru City. The type of this research is descriptive. The population and samples in this study were volleyball extracurricular students of SMPN 34 Pekanbaru City, totaling 23 male students. The research instrument used is the physical fitness test for junior high school students. The data analysis technique used is to calculate the category of physical fitness values of junior high school students aged 13-15 years. Based on the results of the average calculation, it can be concluded that the level of physical fitness of students who take part in volleyball extracurricular activities at SMPN 34 Pekanbaru City is in the “Moderate” category, with a final average value of 14, which is in the range of 14-17

Penyelesaian Sengketa Mengenai Kepemilikan Ganda (overlapping) Hak Milik Atas Tanah Berdasarkan Peraturan Pemerintah No. 24 Tahun 1997 Di Kecamatan Mandau

Ownership of land is legally recognized only if it is first registered with the land office, in accordance with the provisions of Government Regulation No. 24 of 1997. One of the factors contributing to dual ownership is the negligence of landowners who fail to process the transfer of ownership after purchasing the land and do not maintain their land, causing it to be classified as abandoned land. Since the original seller has passed away and locating the heirs is difficult, the current landowner issues an SKGR (Certificate of Land Ownership) as proof of ownership to resell the land to a new buyer. As a result, two ownership records exist for the same piece of land. The research problem is: What are the factors that contribute to disputes over overlapping land ownership rights, and how is the resolution process conducted by the National Land Agency (BPN) in Mandau District? This study adopts a sociological/empirical legal research approach and is descriptive-analytical in nature. By integrating these two approaches, the research examines real conditions in the field while analyzing relevant legal provisions and linking them to actual circumstances.The data sources consist of primary and secondary data, while data collection methods include interviews, observations, and documentation. The conclusion of this study is that negligence in land sale and purchase transactions, which fails to transfer ownership and neglects to maintain the land, makes it easy for new land ownership certificates to be issued. To resolve overlapping land ownership disputes, a deliberation and family approach is taken. The agreed-upon solution is the issuance of a new land certificate by the National Land Agency (BPN) as proof of legitimate ownership, with the SKGR serving as the basis for its issuance. Since this dispute did not reach the court, the land office has the authority to issue a new certificat

Pengaruh Ph Larutan Dan Penambahan Inhibitor Ekstrak Daun Ketapang Terhadap Korosi Pada Baja Karbon Rendah

Low carbon steel is a type of steel that has a relatively low carbon content, typically less than 0.3% by weight. The main issue with using low carbon steel is corrosion, which can significantly affect its lifespan. One effective method to reduce the rate of corrosion is by adding inhibitors. These inhibitors can be derived from readily available natural materials, such as ketapang leaves. The objective of this study is to investigate the effect of solution pH and the addition of ketapang leaf extract as an inhibitor on the corrosion of low carbon steel. This research utilized ASTM A36 steel with variations in media of HCl at pH 1, HCl at pH 3, and H2O at pH 7, with immersion times of 6 hours, 12 hours, and 912 hours. The concentrations of ketapang leaf extract used as inhibitors were 1000 ppm, 2000 ppm, and 3000 ppm. The results of this study indicate that the inhibitor effectively reduces the corrosion rate, with the highest efficiency observed at a concentration of 3000 ppm, achieving 69.478%. The lowest corrosion rate recorded was during immersion for 912 hours in water with a concentration of 3000 ppm, which was 0.061 mm/y. The corrosion rates for 912 hours of immersion with 2000 ppm and 1000 ppm inhibitors were 0.100 mm/y and 0.122 mm/y, respectively. The corrosion rate at pH 7 was lower compared to pH 1 and pH 3 because, at low pH (with high concentrations of ? +ions), the reduction reaction of ? +ions to hydrogen gas occurs more rapidly, thereby increasing the oxidation reaction of metals to supply electrons for this process, ultimately accelerating the corrosion process

Pengaruh Heat Treatment Pada Sifat Mekanis Dan Ketahanan Korosi Baja Karbon Rendah

Low carbon steel ASTM A-36 is widely used in structural construction due to its strength, toughness, and ease of processing. This study aims to analyze the effect of heat treatment with variations in cooling media on the mechanical properties and corrosion resistance of this steel. Heat treatment was conducted at 850°C for 50 minutes, followed by cooling using oil, air, and furnace. Testing included tensile tests, microstructure analysis, and corrosion tests using the weight loss method with a saline solution. The results showed a maximum tensile strength of 405.9 MPa with air cooling, whereas without heat treatment, the tensile strength was only 373.7 MPa. The maximum elongation of 17.50% was obtained with oil cooling, while the minimum elongation of 8.85% was observed in the untreated specimens. Microstructure analysis revealed that fine pearlite in oil cooling improved toughness, while furnace cooling resulted in larger grain structures that were softer. In the corrosion test, air cooling showed the lowest weight loss and corrosion rate, with the smallest corrosion rate of 0.085 mm/y achieved in the aircooled specimens. Air cooling was proven to provide the best balance of strength, toughness, and corrosion resistance, making it the optimal choice for structural applications

Pengaruh Variasi Campuran Serbuk Tembaga Dan Grafit Terhadap Konduktivitas Listrik, Kekuatan Bending Dan Mikrostruktur Pada Plat Konduktor Polimer

Polymer conductor plates are the result of fabrication of the Polymer Matrix Composite (PMC) type made from non-metallic particles and polymers as the matrix. One of the materials that is good at conducting electric current such as copper. This study was conducted to see the effect of variations in the mixture of copper and graphite powders on electrical conductivity, bending strength and microstructure on polymer conductor plates. This study carried out variations in the mixture of copper powder, graphite and epoxy resin which were different starting from 15%: 75%: 10%, 20%: 70%: 10% and 25%: 65%: 10%. The results of the highest electrical conductivity and bending strength tests occurred in sample 3 with a variation of a mixture of 25% copper powder, 65% graphite and 10% epoxy resin. This is because the influence of a larger copper powder mixture results in less resistance occurring on the polymer conductor plate. If the resistance is small on the polymer conductor plate, it makes it easier to pass electric current, the lower the resistivity value causes the ability of the polymer conductor plate to pass electric current better so that the electrical conductivity value on the polymer conductor plate increases and the bending strength value is high because copper is a metal that can be easily formed so that it can withstand loads or forces in the same direction. This event is seen from the results of the microstructure test, where the greater the copper mixture, the higher the electrical conductivity and bending strength values

Study Evaluasi Uncertainty Porositas, Saturasi Air Dan Pengelompokan Zona Lumping Pada Reservoir Sandstone Di Lapangan X

Enhanced to increase well production in oil fields, the initial stage involves geological and geophysical reservoir studies. This study includes petrophysical analysis, which is conducted before reserve calculations in the development of production wells. However, the results of petrophysical analysis have uncertainties since the values obtained from well log interpretation are not always accurate. In this research study, well log data from four correlated wells in Field X across seven formations located in the Central Sumatra Basin were analyzed using Paradigm Geolog software. The methodology employed in this study is qualitative, aiming to evaluate the uncertainty of petrophysical parameters, particularly porosity and water saturation, as well as to perform unit lumping classification. The analysis focuses on petrophysical properties derived from Monte Carlo simulation output to account for variations caused by systematic and model-based errors.Uncertainty evaluation in this study utilizes the Monte Carlo probabilistic simulation method to assess the impact of input variability on final results. The uncertainty analysis of porosity across all formations in each well indicates that the average uncertainty in porosity variation within Formations T_A and T_D, across different percentiles, reaches 1%, while Formations B, E, and F show a variation of 0.7%, Formation T_C 0.9%, and Formation T_G 0.2%. Meanwhile, the variation analysis of water saturation values across different percentiles in all formations ranges between 1% and 4%.Regarding net pay thickness, Formation A ranges from 30ft to 35ft, Formation B from 1ft to 2.5ft, and Formation C from 31ft to 36ft, but in well WA- 003, it is 17ft. Formation D has a net pay thickness of 24ft to 37ft, but in well WA- 004, it is 7ft. Formation E varies between 18ft and 29ft, but in well WA-004, it is xvii 6.5ft. Meanwhile, Formation F ranges from 28ft to 74ft, whereas in well WA-004, the thickness is 4ft

Penanggulangan Balap Motor Liar Oleh Satuan Lalu Lintas (sat Lantas) Polres Kota Dumai

Juvenile delinquency can be defined as deviant behavior or socially unacceptable behavior to status violations to criminal acts. Illegal racing as a form of juvenile delinquency is very dangerous, not only for the perpetrators, but also for others, especially other road users. This illegal racing phenomenon is actually not a foreign thing for the community. Illegal racing is considered reckless, In addition to illegal racing and endangering other road users, it also endangers oneself because, driving a motorbike without wearing a helmet, as well as pollution, noise and air created because the motorbike has been modified in such a way that it makes a very loud sound and the smoke from the exhaust is very thick. The main problem in this study is what are the factors that cause illegal racing in the jurisdiction of the Dumai City Police Traffic Unit and what are the efforts to overcome illegal racing in the jurisdiction of the Dumai City Police Traffic Unit. The research method used in this study is a survey, while the nature of this study is descriptive. The population in this study were the Head of Criminal Investigation Unit of Senapelan Police and investigators of Criminal Investigation Unit of Senapelan Police with Accidental Sampling technique and the data collection tool used was interview. From the results of the research conducted by the author, it is known that the factors that cause the factors that encourage illegal racing in the jurisdiction of the Dumai City Police Traffic Unit are hobby factors, betting factors (gambling), environmental factors, family factors. Efforts made by the Police to overcome illegal racing in the jurisdiction of the Dumai City Police Traffic Unit include anticipation of illegal racing on Saturday nights, scheduled inspection of vehicle documents and completeness, patrols carried out by the Dumai City Police Traffic Unit and officers from the sector police, coaching and counseling for young people, taking action by criminalizing. The obstacles faced in overcoming illegal racing in the jurisdiction of the Dumai City Police Traffic Unit include cooperation and coordination between related parties still need to be improved, the absence of an official circuit, people who tend to like gambling are also obstacles

Studi Laboratorium Pengaruh Tanin Ekstrak Daun Jambu (psidium Guajava) Pada Proses Penanganan Scale Di Pipa Salur Minyak Bumi

Petroleum and natural gas are non-renewable energy sources that are rapidly depleting worldwide. One of the common issues faced in the oil and gas industry is the formation of scale deposits on various components in the production system, such as oil wells, flow pipes, and downhole pumps. These deposits can obstruct fluid flow and reduce production efficiency. The formation of scale is influenced by various factors, including variations in temperature, pressure, pH, and the interaction between formation water and other components. Therefore, the use of effective scale inhibitors is crucial to address this problem. This study aims to investigate the potential of guava leaf extract as an organic inhibitor for scale formation, as an alternative to more hazardous and expensive inorganic inhibitors such as EDTA 2Na and inorganic acids. In this study, guava leaf extract was obtained using an appropriate extraction method, and its composition was analyzed using ultraviolet-visible (UV-Vis) spectrophotometry to identify active compounds that may act as scale inhibitors, such as tannins, polyphenols, and saponins. The results show that although guava leaf extract has a moderate potential to reduce scale, EDTA 2Na demonstrated a higher efficacy with a greater reduction percentage. The maximum reduction percentage recorded for guava leaf extract was 14% under soaking conditions for 50 minutes with a volume of 15 ml. Meanwhile, EDTA 2Na showed superior results with a more significant scale reduction under the same conditions. However, guava leaf extract exhibited better consistency in reducing scale as the additive volume increased, though the results were more variable compared to EDTA 2Na. This study concludes that although EDTA 2Na is more effective in reducing scale, guava leaf extract has the potential to be used as an environmentally friendly, cost-effective, and non-corrosive organic inhibitor, making it a promising alternative for future oil and gas industry applications

Pengaruh Waktu Siklus Terhadap Efektivitas Dan Efisiensi Alat Berat Pada Pembangunan Jalan Bandar Picak (batas Kabupaten Rohul) – Pendalian - Rokan

Infrastructure development is one of the government's efforts to improve the quality of life of the community and encourage economic growth in each region. Flexible roads are one of the infrastructure developments. In the implementation of large-scale flexible road development, heavy equipment is needed to facilitate human work. In its implementation, the cycle time of heavy equipment has an influence on the productivity of each heavy equipment. The purpose of this study is to determine the activities of heavy equipment, determine the cycle time of heavy equipment, determine the productivity of heavy equipment, and determine the effect of cycle time on the productivity of heavy equipment. The method used in productivity analysis is the time study method. The time study method is a work measurement technique by collecting data based on the time needed to complete a job. Based on the results of the Analysis on the AC-BC layer and the AC-WC layer. On the AC-BC layer, for dump trucks with a cycle time of 239.39 minutes and a productivity analysis of 3.81 tons/hour, Asphalt finisher with a cycle time of 7.66 minutes and a productivity of 120.495 tons/hour, Tandem roller with a cycle time of 3.03 minutes and a productivity of 116.119 tons/hour, and pneumatic tire roller with a cycle time of 2.81 minutes and a productivity of 76.708 tons/hour. Analysis Results on AC-WC Layer, for dump trucks with a cycle time of 237.72 minutes and a productivity analysis of 3.835 tons/hour, Asphalt finisher with a cycle time of 15.7 minutes and a productivity of 58.433 tons/hour, Tandem roller with a cycle time of 3.63 minutes and a productivity of 66.045 tons/hour, and pneumatic tire roller with a cycle time of 3.47 minutes and a productivity of 41.396 tons/hour. The effect of cycle time on productivity is where the longer the cycle time, the smaller the productivity. Field analysis obtained a total cost of renting heavy equipment for AC-BC and AC-WC asphalt layer work of 106.071.506,72 rupiah, while the total cost of renting heavy equipment according to the implementation time schedule was 551,740,610.4 rupiah, The difference in total rental costs between the analysis and the planner according to the time schedule was 445.669.103,68 rupiah