Gangguan kesehatan akibat melakukan suatu pekerjaan merupakan hal yang akan selalu dialami. Kurangnya pemahaman tentang cara yang baik didalam berinteraksi antara manusia dengan lingkungan kerja, menjadi factor utama dari munculnnya resiko tersebut. Salah satu pekerjaan yang umum dikerjakan dan memiliki probabilitas resiko buruk yang tinggi adalah pengemudi becak kayuh. Berat...
This research aims to find out the effect of shot peening on the rate of fatigue crack propagation in the aluminum alloy 5083, which has undergone the friction stir welding (FSW) process. In general, the FSW welded joint is subjected to softening and decreasing mechanical properties compared to the parent metal. Shot peening treatment is expected to reduce the rate of fatigue...
Garbage is now very possible to be recycled. One way to help the recycling process is to make a plastic bottle crushing machine. In this study,the test material is a plastic bottle with a thickness of 0.1 mm. Then we calculated the engine capacity, electrical energy, the profit of production costs, the comparison of the efficiency of the electric motor drive compared to the...
Jaket tidak hanya digunakan untuk memenuhi kebutuhan pokok sandang. Namun jaket juga menjadi kebutuhan dalam dunia kerja untuk beberapa profesi, seperti kurir. Profesi kurir memiliki kontak secara langsung dengan berbagai kondisi musim dan cuaca. Hal ini menyebabkan jaket menjadi kebutuhan utama dalam profesi kurir. Permasalahan tersebut menyebabkan perlu adanya perancangan ulang...
The application of river flow water turbines as energy sources often experiences obstacles such as the changing speed of river water flow and low turbine efficiency. This obstacle can be overcome by creating an effective and efficient river flow turbine. One way to overcome these obstacles is to add a propeller and diffuser on the turbine. This study aims to determine the value...
Student lecture activities not only carried out on campus. Learning is sometimes also done at home. The use of chairs and tables as a learning tool must be adjusted to the level of ergonomics. This will have an impact on student health complaints when studying. The analytical method for health complaints in this study is the RULA (Rapid Upper Limb Assessment). The subjects of...
Compost can occur by itself through natural processes, but the process takes a long time. The process of organic materials such as grass into compost can be accelerated by the process of being chopped into small pieces first, then mixed with microorganisms. The process of cutting or chopping grass will be faster if done with a chopper machine. The size of the grass's chops...
Ultra High Molecular Weight Polyethylene (UHMWPE) is a biomedical polymer applied for orthopedic as hip, knee, ankle and lumbar disc implants. The use of this material is common as a joint component paired with metallic biomaterials such as 316L stainless steel (SS 316L), cobalt chrome alloy (CoCr) dan titanium. This application has a wear problem. UHMWPE implants are commonly...
Micro, Small and Medium Enterprises, which are often referred to as SMEs in the field of food processing in Yogyakarta, are numerous one of which is the cassava processing SMEs in Gunungkidul Regency. Cassava is an agricultural commodity that is a typical local product of Special District of Yogyakarta, especially in Gunungkidul Regency. SMEs are proven as a support of the...
The tool pin rotational speed and welding speed affect the electrical conductivity value of the Al-Cu connection. Al-Cu connection is a butt joint resulting from the friction stir welding (FSW) process. The material used is Al 6061 and pure copper. The friction stir welding (FSW) process uses a pin tool with a pin design that integrates with the pin tool and a three-degree angle...
In the air conditioning system, hot water boilers are used for the purpose of room heating and reheating processes. In tropical countries, the function of space heating is carried out for process rooms, while the function of hot water for the reheating process is widely used. In this case, the hot water produced by the boiler is used for the reheating process in the Air Handling...
One of the abundant energy source in Indonesia is organic waste in the form of leafs and branches which is widely avalilable in homeyard. It can be utilized as alternative energy source by gasification process. The objective of the study was to know the influence of raw material and AFR to the characteristic of organic waste gasification process. The raw material used were leafs...
Diesel Motor is a type of piston combustion motor commonly called Ignition Compression Engine Combustion Engine. The use of coconut fiber chopper machines using diesel drive engines in the market has not been able to increase consumer comfort and efficiency. Because of this issue that emits CO2 and NOx also causes air pollution and noise emissions, it tends to be relatively large...
The objective of this research is to find out the effect of preheat on mechanical properties of the metal inert gas welding (MIG) on low carbon steel. The welding method uses a MIG welding on a low carbon steel strip plate specimen, in the V angle of 60°, using ER70S-6 electrode wire and CO2 for protection, the variable of this research is a preheat temperature of 100 oC, 200 oC...
The goal of this research was to find out the aerodynamic body design of Mataram Proto. Using Solidwork 2015 for modeling the body and Ansys 2015 for numerical simulation were the main tools of this research. The body was drawn with scale 1: 1 and then imported into Ansys 2015 for meshing. The unstructured meshes were used in this research. After those, using Ansys 2015, the...
Cocoa waste can still be used as something useful such as compost. The objective of this work is to make an organic waste crusher machine from cocoa waste. The method was the determination of systematic crushing, functional design, draw the crusher, making a prototype of the crusher machine, and performing functional test of the crusher. The crusher machine has been designed and...
Kerupuk jengkol merupakan makanan tambahan sebagai pelengkap hidangan. Kerupuk jengkol banyak sekali penggemarnya dari kalangan anak-anak, muda dan orang tua. Hal ini disebabkan kerupuk jengkol itu renyah serta gurih dan dapat menyesuaikan jenis hidangan yang disantap. Disekitar kita banyak sekali tentang jenis kerupuk jengkol yaitu kerupuk jengkol yang berbentuk lingkaran...
Quadrocopter is an aerial vehicle platform that has become very popular among researchers from the past because it has advantages compared to conventional helicopters. The quadrocopter design is very simple and unique but seen from an unstable aerodynamic standpoint. From existing research, researchers have proposed many control system designs for quadrocopter. In this study, the...
One of the environmental issues to be addressed, particularly in the field of refrigeration and air conditioning, is the destruction of the ozone layer and the effects of global warming due to the use of environmentally inefficient refrigerants. In the field of Refrigeration and Air Conditioning, refrigerant as a cooling medium, plays an important role, and until now there is...
Onset temperature is one of the most important parameters in thermoacoustic generator to be researched. In that application, onset temperature can representated how many the performance of this device, if seen by input energy, used the system of the thermoacoustic generator. Decreasing onset temperature so decreases the energy that used to generate acoustic energy in...
The development of automotive technology in Indonesia is directly proportional to the use of a lubricant that consumption is also developed from the technology. But from the proposal, we could not confirm whether the factory owners of output oil is better than the oil output in the factories. Of motor vehicle, gas emissions as a source of air pollution reached 60-70 % largest...
The purpose of this research is to determine the effect of heat treatment hardening of AlMgSi-Fe12% casting aluminium alloys on wear. The tests were carried out on specimens of raw materials and heat-treated specimens with variations of temperature used were 550 oC, 575 oC, 600 oC, and 625 oC, and used 15 minutes of holding time in each heat treatment, then quenching in SAE 20...
The development and progress of science and technology in the metal plating industry has become a field of work that is experiencing rapid advances ranging from the type of coating, a coating material that is used, and the results of a layer. The metal plating industry needs not only demand resistance to corrosion, but also the strength of the material, has a beautiful appearance...
Pada Gasifikasi tipe Updraft bahan bakar dimasukkan dari bagian atas dan udara masuk pada bagian bawah reaktor.Kekurangan dari gasifikasi tipe Updraft adalah gas yang keluar dari reaktor berada pada kondisi temperatur rendah (<500 0C), serta membawa tar yang terkondensasi serta minyak yang berasal dari proses pirolis. Pada penelitian ini akan membandingkan bahan bakar biomassa...
One of the ideal geometric characteristics of a component is a smooth or rough surface. In practice, it is not possible to obtain a component with a smooth/rough surface. This is due to several factors, such as the human factor (operator) and the factors of the machines used to make it. However, with technological advancements, the growing apparatus capable of forming surface...