PrefaceToday's advance of technology and development of the industry require companies to move quickly in making innovations and specific policies in order to compete in the industrial world. One of the policies that can be applied in the company is the policy on maintenance. Maintenance is all activities conducted to maintain or restore the condition of the equipment or machinery in accordance with the desired function [1].PT. XYZ is a paper manufacturing company in East Java, which produces Exercise Books. In order to meet high demand for its Exercise Book product, the company operates for 24 hours with three shifts. By implementing 24 hours' operating system, the company applies a corrective system to maintain its machine, namely the replacement of component when the machine is damaged. This maintenance system causes frequent sudden machine stopping during production process. It may trigger further damage to raw materials during machinery processing, causing losses for the company. To minimize this, better interval maintenance planning is required in order to reduce the frequency of breakdowns that occur suddenly. Another goal is to minimize downtime and costs due to maintenance activities. In practice it is extremely difficult to determine the operational or maintenance strategy facilities strategies in order to reduce maintenance costs [2]. The uncertainty in preventive maintenance activities can be solved by using model parameters which are made to achieve the expected target. Monte Carlo simulation can predict future performance [3]. The method used for the analysis of maintenance costs must be able to measure the effect of the operating environment on the reliability of the system and measure of uncertainty [4]. Monte Carlo method is often referred to as statistical simulation method. This method can be used in many areas or places to solve the problem containing uncertainty [5].The above-mentioned preliminary researches can be used as consideration in solving the problem at PT. XYZ Company. In order to plan maintenance interval that contains uncertainty we can perform an analysis by implementing Monte Carlo simulation.

Pengabdian kepada masyarakat (PkM) ini dilaksanakan pada Karang Taruna yang terletak di Kelurahan Srengat Kecamatan Srengat Kabupaten Blitar. Permasalahan pada Karang Taruna ini adalah, banyak anggota Karang Taruna yang masih belum mendapatkan pekerjaan yang tetap, banyak yang menganggur, terkadang kerja terkadang berhenti, belum mengenyam pendidikan tinggi dan tidak mempunyai pengetahuan serta ketrampilan yang dapat digunakan sebagai nilai jual bekerja baik wirausaha ataupun bekerja di bengkel/perusahaan. Solusi untuk memecahkan permasalahan yaitu melalui beberapa kegiatan, antara lain: pelatihan teori pengelasan dan pelatihan praktek pengelasan SMAW dengan membuat rak bunga. PkM ini ini mempunyai tujuan untuk meningkatkan ketrampilan pengelasan SMAW pembuatan rak bunga. Luaran dari PkM ini adalah kegiatan pelatihan pengelasan SMAW dan bantuan unit pengelasan kepada Karang Taruna yang dapat digunakan untuk latihan dan untuk kelengkapan kegiatan karang taruna. Materi pelatihan meliputi K3 dalam pengelasan, dasar dasar pengelasan dan pengelasan SMAW Kesimpulan yang diperoleh selama program kegiatan PkM ini adalah adanya peningkatan pengetahuan dan ketrampilan remaja karang taruna tentang pengelasan SMAW pembuatan rak bunga sehingga mendapatkan bekal yang cukup sebagai modal kerja atau berwirausaha.

Cooling is an important activity in maintaining a large temperature of a component, both mechanical components and electronic components. Component temperature which is maintained from overheating will avoid damage. The cooling process is carried out by moving the heat produced by a component through a heat exchanger. One effective heat exchanger is Thermosyphon. This tool is able to move a number of heat through a very small surface area. Thermosyphon is a pipe that contains a working fluid, consisting of three parts, namely the evaporator section, the adiabatic section and the condenser section. The evaporator has the function of absorbing heat from the heat source and heat is released in the condenser. The process of heat absorption and release of heat is carried out by the working fluid in the pipe, when the fluid is in the heated evaporator it will evaporate towards the condenser the heat is released. The fluid which is finally from the condenser returns to the evaporator. This study aims to determine the thermal performance of the thermosyphon as a heat exchanger with condenser length variations. Thermosyphon is designed with a condenser length variation of 44 cm, 66 cm, 88 cm, 110 cm and 132 cm running with variation temperature. The results showed that, the highest thermal resistance at the shortest condenser length at 400C (140C / W) and the lowest at the longest condenser length at 1200C (10C / W). At all temperatures, all variations in the length of the condenser will increase the output power and heat flux. At the same condenser length, the higher the temperature, the greater the heat flux and output power. The process of this experiment is most effective at the length of the condenser 1.25 (132 cm) from the length of the evaporator length, because after that the value of thermal resistance and output power will experience a permanent tendency.

<p>Wind energy is a renewable energy source that can be utilized by utilizing wind turbines which can convert wind energy into a form of mechanical energy and with a generator electrical energy can be generated. The purpose of this study was to analyze the performance of the Darrieus-H naca 3412 vertical axis wind turbine with variations in the number of blades, wind speed and diameter of the rotary axis. The method used in this research is to use an experimental method, namely by varying the diameter of the rotating axis, the number of blades and wind speed. The number of blades varied were 2, 3 and 4. The wind speeds that were varied were 3.2 m / s, 3.6 m / s, 4 m / s and 4.4 m / s. The diameter of the rotary axis used is 150 mm, 200 mm, 250 mm, 300mm and 350 mm. From the research, it is found that in all values of the diameter of the vertical axis wind turbine at a speed of 4 m / s, the more the number of blades will increase the output power of the wind turbine. The largest output power is on blade 4 with the largest diameter of the rotary axis, which is 3.52 Watts</p><p>For all wind speed values on a wind turbine with a number of blades of 4, the larger the diameter of the rotary axis will cause the greater the output power generated. The largest output power is 3.52, which is at the highest wind speed of 4 m / s, the largest diameter of the rotary axis, which is 350 mm. The greater the wind speed of all rotating axis diameters, the greater the output power produced, which is 3.5 W on the diameter of the rotary axis 4 with a wind speed of 4 m/s</p>

Metode mengenai perpindahan panas terus mengalami perkembangan, untuk meningkatkan perpindahan banyak cara untuk mempercepat laju perpindahan panas, salah satunya dengan menggunakan media berpori dengan berbagai material, sehingga peneliti tertarik untuk mendalami bagaimana proses distribusi temperature yang terjadi pada silinder berpori dengan variasi porositas dengan disimulasikan menggunakan program computer. Kemudian Tujuan dari penelitian ini ialah untuk memperoleh distribusi koefisien temperature yang sedang terjadi pada silinder berpori dengan variasi porositas 0,1; 0,2; 0,3. Dari percobahaan dan pembahasan maka dapat ditarik kesimpulan ialah porositas pada silinder menunjukkan semakin besar porositas mengakibatkan K efektif menjadi kecil, dan nilai h (koefisien perpindahan panas) juga kecil.