The objectives of this research are to develop the welding process of copper tube for refrigeration in air conditioner by using rotation brazing table. The key design is the use of rotary head for nitrogen and rotary head for cooling water in assembly jig nitrogen discharge to prevent the internal welding soot to remove the soot that may occur during welding from piping system and to cool down the profile quickly. The result of water cooling to prevent that damage due to the heat of welding. The result from designing and creating of rotation brazing table to substitute stationary welding found that there is the reduction of machine cost by 11.61% or 46000 Baht/machine reduction of usage space 8.75 square meters or 74375 Baht increase of productivity by 93.48% reduction of nitrogen consumption by 98.20% or 2593 Baht/month reduction of support tool in production 75000 Baht per one rotation brazing table reduction of tiredness from working by 30.24% or equal to 137 manual works per day and reduction of usage of consumable material that can cause of greenhouse gas in form of trash such as cloth glove 1.40 KgCo2 per year leather glove 12.5216 KgCo2 per year nitrogen gas 0.1784 TonCo2 per year and water 0.54 KgCo2 per year. All of these can support the competition and dynamic change of industrial air conditioner in the future sustainably.

The study on the analysis of long-term relationship among stock markets from ASEAN trading linkage: After Integration was aimed to investigate its long-term relationships as well as the short-term adjustability to establish balance among the stock markets in Thailand Malaysia and Singapore after the ASEAN unification. The research data were compiled daily from the stock markets in the three countries from 16 October 2012 until 30 December 2014. The analysis was to obtain long-term cointegration using Johansen and short-term adjustable ability to gain balance with Vector Error Correction Model (VECM) The result revealed that ASEAN trading link showed long-term relationships in good balance as well as short-term adjustable ability to gain balance of the models among the three countries. It was found that factors influencing Thailand and Malaysia stock markets were accordingly correlated opposed from Singapore which means that the three countries are well-balanced in the long and short run. It may be concluded that the stock markets in the three countries will demonstrate good integration after the ASEAN Trading Link

The objective of this research is to study how rotation speeds affect mechanical properties with friction welding between semi-solid metal 7075 aluminum alloys and semi-solid metal 356 aluminum alloys. The factor of interest is rotation speeds with different conditions at 800 1000 1200 1400 and 1600 rpm respectively. 1.8 millimeter for burn of length 30 seconds for welding time and clockwise rotation are set as a control constant condition for the entire experiment. After friction welding we found that different rotation speeds significantly affected mechanical properties of these alloys. At rotation speed 1400 rpm the maximum tensile strength is 122.24 MPa and the maximum hardness in welded zone is 140.5 HV. The microstructure size is 2.250 µm long and 2.144 µm wide. Its size in welded zone is practically small because of friction force. Moreover this friction force causes the mixture of MgZn2 and Mg2Si in welded zone.

The propose of this research present a comparative study of the Reliability Improvement of Electrical System for Electric Mass Rapid Transit Train which describes in term of the power supply efficiency including voltage imbalance that could indicate how much the electric power quality is being more or less. The electrical system to be used in the Mass Rapid Transit system has 4 types of connection between three (3) phases of Metropolitan Electricity Authority (MEA) transformer and station transformer which is Single phase V-Type Scott and Le- Blanc to be considered for the different transformer connections type could be carried out and resulted in the most unbalanced in power supply as well as properly solution for power supply mitigation of voltage imbalance. From foregoing the data analyst was discovered that a single phase connection could cause the most unbalance voltage but on the other hand Le-Blanc connection is the least unbalance which could be reduced the impact on the Mass Transit Train and increase the credibility of consumers in order to continuity implement service usage.

This research aims to study the website link analysis of Faculty of Engineering RMUTP both of the internal link or the external link via the HTTP standard response code of all 9 under graduate departments web pages. From reasons of the web developers create and modify some part of content such as to include more the pieces of information or to exclude its. The website data collection period started from February 2018 to May 2018 via several directory paths or link-paths and the author found 404 (Not Found) most often than 405 (Method Not Allowed) and 504 (Gateway Timeout) in order on average 78 percent. Totally the links into and out of the engineering faculty website approximately 7500 connections.