Power Amplifier Class D

2020

This research aimed to study the loss in energy from waste process, analyze causes, and provide a guideline to reduce the loss by analyzing defects and effects. This study was based on 20 key informants from the waste electrical power plant in Khon Kaen, as a case study. The data were analyzed with Process Flow Chart, Pareto chart, Risk Assessment, Cause and Effect matrix, Defect and Impact Analysis (FMEA), and Relationship Diagrams. The results showed the loss in the energy from waste process came from the stoppage of waste incineration. The study found that the reverse and forward stepping grate machine was a cause of the loss. As a result of the analysis, the loss reduction by analyzing the defects and the impact, it suggested increasing frequency of monitoring the distance (GAP) of the Grate Bar, installation thermometer under the continuous combustion chamber, and checking cleaning fan system every two hours . These guidelines could reduce loss in the energy from waste proce...

The Journal of King Mongkut's University of Technology North Bangkok, 2021

In this study, effect of gas nitrocarburizing process on hardened and tempered high speed tool steel (SKH51) under the hardening and tempering process by difference heat treatment processes (tempering 2 cycles and 3 cycles before nitrocarburizing process) were studied. The results showed that nitrocarburizing process can increase a higher surface hardness approximately 4.4 times compared to non-heat treatment or approximately 1.4 times compared to hardened and tempered specimen. In addition, the nitrocarburizing process can be used instead of a tempering process. Moreover, heat treatment process and the production cost can be reduced by nitrocarburizing process.

2017

The purpose of this research is to study the effect of a safety system provided for column reinforcement activity on productivity by studying a construction of buildings in Bangkok. The safety system composed of (1) stable scaffolding system, (2) providing clean and not slip walkways on the scaffold, (3) installation of handrails not less than 0.90 meters in height, (4) installing stairs, and (5) providing personal protective equipment for workers. Cost of the safety system is 40,030 baht for a column reinforcement area of 40 numbers. Productivity rates for prior and after the used of safety system are 11.06 and 8.80 kg./person/hr., respectively. The productivity declines for approximately 20.43 %, the working time for column reinforcement could take longer for 13.18 % and labor cost could increase for 13.32 %.

Engineering and Applied Science Research, 2012

This article presents an engineering feasibility study of Lam Chi Long small run-of-river hydropower project. The study was started by data collection, creating a longitudinal profile of the river, and locating a proper site of intake and 3 alternative sites of power plant. The meeting of the villagers, the local administration officials, and stakeholders was then organized in the project area. The meeting aimed to allow them to consider the project possibility and their cooperation. The natural stream discharge at the intake site, the design and the effective discharge were then calculated. There were 3 alternative values of the design discharge i.e. equal to the minimum flow, and to 50% and

Burapha Science Journal, 2017

The campaign of power plant from a renewable energy is a well - thought - out process employed by Thai government to substitute or diminish the dependence on the fossil energy . Many biomass projects have yet come across management problems. A study of critical indicators for establishment of community - based biomass power plant ( CBP ) is a promising way for approaching practical consideration of biomass power plant projects . This research employed a multi - stage sampling technique which separated the data by locations and business operations . The total of 1,151 questionnaires is collected from the local communities around the seven target areas. The indicators were measured by confirmatory factor analysis for evolving the causal model of CBP establishment. Research findings were as follow: 1) the indicators of community expressed that are information, management participation, the importance of community, biomass communication network, worthiness, and sincerely support; 2) the indicators of technology expressed that are the optimized technology, innovation, and technology transfer; 3)the indicators of biomass residue expressed that are the available biomass residue, long term contract, the financial subsidization, low cost cultivation, the additional income, and the location of CBP; and 4) the indicators of government support stated that are research and development, the participation of government, policy for establishment, and interest condition. The results fitted with the empirical data at 0.05 statistically significant level.

The Journal of King Mongkut's University of Technology North Bangkok, 2024

Biomass briquette charcoal has been studied using a variety of agricultural waste materials. The outcome revealed that the charcoal bars are still inefficient in use because of their fragility, high moisture causing mold, difficulty setting up, short burning times, and smoky. The aims of this research are to build up a biomass charcoal briquette machine and to examine the raw material proportions. Durian peel and mangosteen peel charcoal were mixed with cassava starch. The mixing ratio by weight between Durian peel and mangosteen peel was 4 : 1, 2 : 1, 3 : 2, 1 : 1, 2 : 3, 1 : 2, and 1 : 4. The biomass charcoal briquette machine was evaluated for its forming ability, physical shape, and density while the properties of charcoal briquettes were analyzed based on American Society of Testing and Materials (ASTM). The results reveal that this machine is efficient to use considered by smooth surface, sturdiness, and density (604.94–612.12 kg/m3). The charcoal briquettes made from durian peel and mangosteen peel in the ratio of 1 : 4 can be achieved all criteria which have the highest calorific value of 5,572.78 kcal/kg, the lowest moisture content of 4.82%, the minimum volatile matter content of 7.26%, the minimum ash content of 9.47%, the maximum fixed carbon of 75.39%. Also, it has a bulk density of 606.32 kg/m3, a heat utilization efficiency of 22.79%, and a burning time of 99.47 minutes.

Journal of the Medical Association of Thailand = Chotmaihet thangphaet, 2007

Physicians are either in the royal service or private section. They are taught to have strong self-confidence, depending on their own thoughts, making decision and performing their sole duties, especially when they are on duty. During their non-official time, the patients' problems may be simple, but most of them are severe and complicated, and still exist even when they are off duty. It is difficult for the off duty doctor to leave the suffering patient. They must keep performing their services. It looks like they are working overtime. By surrendering to such an extraordinary service, they will be admired as a "devotee". It makes for a good feeling for the doctors. However, by the same token, if any mistake happens, the doctor will be accused, sued, and sentenced to jail by a court as a criminal person and against Act Number 41 of the National Health Plan 30 Baht bill. Present day doctors are fully aware of their idealistic ethical status through the transitional zone of the rapid change of the cultural milieu of Thai society. The world is round with some angulations and valleys to form shelter, protecting from heat, cold, flood, and tsunami, etc. The differentiated lines of right and wrong of the duties of doctors are closed to each other. And the doctor's duties seem to be a thunderstorm catcher. The physician's professionalism is abuse politically by the society and its rulers. It is hard to believe that the doctors cannot ask for help, and at the same time, these is some one among them tries to irritate them the most. These are other factors that are part of the idealistic, ethical doctor of the appropriate present situation. Fifteen medical schools in Thailand understand well the mentioned appropriation. It does not stand for "too much" or "lack of". The medical graduates should learn its meaning best to insure their professional life and family. It is the talk of the town that etiquette is defined as "they must do good things and avoid all bad things". The sentence is short and understandable; but with huge meaning, as big as the sky and, as deep as the sea. Doctors' etiquette has a high standard. This is another social request for the appropriate physician's professionalism. There are many changes in Thai trans cultural. Thais must live and have good relations with others. Thai wealthy must be strong in order to obtain necessary import living needs and pay for their study in research and development. Physicians are included in this circle. The physicians have to provide services to their patients who will ask for everything that is life saving, advertised in all media. Ethics, mores, culture are our basics for marketing, but they must be clean, and accountable, as they are standard requirements for good friends. The 6 basic principles of ethics: human rights, justice, truth telling, confidentiality, good performance, deleting bad events; they are considered to be an insurance for a physician's life. Good thoughts toward any one, gender-sex-religious-economic status, and age discrimination, are strictly eliminated. How can we find such an appropriate physician?

2011

For mango grading according to the weight criteria, the mangoes are weighed by the load cell on the dynamic weighing system. Load cell is a device that converts the mechanical weight to an electrical signal which passes through the filter. In the previous research work, it focused on the development of filters for increasing the speed of weighing, measurement accuracy and precision as well as eliminating high frequency noise. In this research article, an effective filter is proposed for estimating a weight signal obtained from the load cell. The results showed that although the weight signal was interfered with heavily impulse noise, the developed filter could provide accurate and precise value of the weight. Furthermore, the results obtained from the proposed filter were more accurate than the results obtained from the moving average filter and the median filter.

2004

Contemporary insights from sociolinguistic research on the online-offline nexus can have great social-theoretical relevance, even if they are rarely turned into theory proper. This paper offers two proposals for such social theories: one of light social groups, and another one on polycentric social intergration.