The objectives for the study are the causes seeking and studying the critical level of problems for the construction project within the Rattanakosin Technology University; Salaya together with proposing the solution and the prevention as the guidance to manipulate the construction project within the university which may help to reduce the delaying problems. The study would use the data from questionnaires and the interview forms for the construction manager engineer foreman contractor and construction project committee who are working for the 14 constructing projects within the university. As for the data analysis the researchers would compare the critical levels and the frequency of each cause of the delay. The results showed that the Problem causes delays construction occurring in Rattanakosin Technology University; Salaya by simply selecting the S.I. 1 in 3 sequence ที่most valuable of each factor the resulting delays in construction divided into four main topics below 1. Man : of 6 factors the total number of 18 factors 2. Material : of 6 factors the total number of 18 factors 3. Machine : of 5 factors the total number of 18 factors 4. Method : of 6 factors the total number of 18 factors

This study evaluates the fatigue life of a closed-loop oscillating heat-pipe with check valves (CLOHP/CV). The method was predicting the fatigue life of the copper tube to apply for the CLOHP/CV. The fatigue test was carried out by using the specimens made of copper tube (C1220) at the temperature of 293 (room temperature) 473 and 573 K. The three types of hourglass shaped specimen included uniform type one-wave type and two-wave type specimens. It was found that the effect was a direct extension of material structures of specimen and hourglass shaped. It can be said that the number of cycles to failure (Nf) of the two-wave type specimen hourglass shaped specimen was rather sensitive to fatigue motion during testing and the temperature of 573 K has the greatest failure impact.