The bucket tooth is one of an excavator components made of manganese steel used to dig and load land into a truck or elsewhere. The impact of the bucket tooth product needs to be increased so that it has longer lifetime. The objective of this research is to know the right composition of manganese in order to obtain the optimal impact strength. Varying the composition of manganese from 11,2% to 15,1% wt Mn are carried out in an induction furnace. Mechanical tests carried out include microstructure observation, impact and hardness testing. The structure of austenite dominates manganese steel with an average grain size of 60 μm (11,2% Mn) and increases up to 45% for the contents of 15,1% Mn. The lowest impact strength (0,08 J/mm2) in specimens with 11,2% Mn, increases up to 42% (0,142 J/mm2) in specimens with 15,1% Mn. The increase of impact strength is affected by grain size and austenite stability. The hardness of manganese steel with 11,2% Mn (330 VHN) increases up to 376 VHN with 15,1% Mn.

The purpose of this research: (1) Investigated the motorcycle exhaust emissions Suzuki Shogun FL 125 SP in 2007 used premium,pertamax,and pertamax plus. (2) Based on this researchcan be concluded: (1) The measurement premium fuel producedthe lowest emission in CO 3.884% by 9.1:1 compression ratio and the the lowestexhaust gas emission levels in 168 ppmby 9.1:1 compression ratio. (2) The measurement pertamax fuel produced the lowest exhaust gas emission levels in CO 3.237% by 9.5:1 compression ratio and the the lowest exhaust gas emission levels in 210 ppm by 9.5:1 compression ratio(3) The measurement pertamax plus fuel produces the lowest exhaust gas emission levels in CO 2.615% by 10.2:1 compression ratio and the the lowest exhaust gas emission levels in 237 ppm by 9.5:1 compression ratio

The diesel engine lifespan increasing in marine operation will decrease their perfomance.  Some problems will occur, there are hard starting, bad exhaust gas colour and bad power output, suddenly engine stop and hard to start back. There fore any diesel engine training is needed to guard engine perfome. The KKM (Ketua Kamar Mesin= engine room head) training for maintaining their ability to serve diesel engine properly is necesary.   Their ability have came from their friend or autodidact. The 25 fishingman ships were burning at Blora quay last several mounths prove of the lack of their ability. Thre are some rutine maintenances sould be done; every 8 hours Radiator water, diesel fuel and lubricantion oil are controlled, every week (150 hours) air screen cleaning, every two weeks (250 hours) oil lubricant replacement. Every month (500 hours) readjust fuel valve, every 1000 hours oil lubricant replacement and garvernor funtion checking, every 1500 hours inlet manifold cleaning and exhaust sistem, every 3000 fuel tank cleaning and to overhaul also replacement worn out spare parts, every 6000 hours cylinder head take apart and carbonation, and every 12000 hours general over haul and replacement worn out spare part.

Background: Turnover intention is the tendency of employees to leave the organization or resign voluntarily from their job. Several factors that might influence turnover intention are included job satisfaction, work environment, and compensation. Aims: This study aimed to determine the Path Analysis of the effect of job satisfaction, compensation, and work environment on the turnover intention of nurses at Kotamobagu Regional General Hospitals. Methods: A total of 34 nurses (total sampling method) contributed in this cross-sectional study. The model is presented with a single-directed arrow indicating cause and effect. The regression weights predicted by the model are compared with the correlation matrix from the observed data and then the goodness of fit is calculated. This study uses data analysis that is adapted to the research pattern and the variables studied. A causal model was employed, and to test the proposed hypothesis the SEM analytical technique (Structural Equation Modeling) was operated through the AMOS program. Results: From the statistical analysis, the study shows a significant relationship between job satisfaction and turnover intention (p-value = 0.011), and between the compensation and the turnover intention (p-value = 0.026). However, we found that there was no relationship between work environment and turnover intention among the nurses at Kotamobagu Regional General Hospitals (p-value = 0.935).   Conclusion: This study concluded that there is a correlation between work satisfaction and compensation on turnover intention (direct factor), but there was no correlation between work environment on turnover intention (mediator). It is suggested a need to arrange regular evaluation in terms of job satisfaction and compensation to prevent turnover among the nurses.

Bi-directional turbines that are commonly applied to convert wave energy into motion energy are the types of Impulse turbines and Wells turbines. Both types of turbines each have advantages and disadvantages. In this research, hybrid turbine type is designed and made to bridge the weaknesses in impulse turbine and turbine wells. Hybrid turbines are made by placing impulse turbines on the outside while turbine wells placed on the inside. In this research, the variation of hybrid bi-directional turbine design aims to find out the most optimal design of this turbine type. Six variations were carried out including a hub to tip ratio of 0.5 with 4 and 5 Wells blades, a hub to tip ratio of 0.6 with 4 and 5 Wells blades, and a hub to tip ratio of 0.7 with 4 and 5 Wells blades. From the test results on thermoacoustic engine media, based on the hub to tip ratio, the most optimal hub to tip ratio is in the order of 0.7 then 0.6, and 0.5. Whereas based on the number of Wells blade, obtained the number of Wells blade 5 is more optimal than the number of Wells blade 4.