Species composition and reproductive phenology of aquatic plants in Na Haeo District. Loei Province Northeastern Thailand were conducted from October 2008 to September 2009. A total of 85 species 67 genera were identified from 37 families. Of the 85 species there were 4 species of lower plants and 81 species

This research present the method for generate sinusoidal signal with WeinBridge Oscillator circuit. This method used the mathematic analysis for determining the operation of the oscillator circuit. The natural response was second order differential equation. The circuit design begins from simulation with PSpice. When experimental result followed to theory Hardware Circuit was constructed. Analytical theory was confirmed by experimental result well agree.

Total iron (Fe) and fluoride (F) in drinking water collected from Raj~angala University of Technology Phra Nakhon by using spectrophotometry method were detennined. During November 2007 and March 2008 30 drinking water samples were collected in 5 areas; Tewes Chotiwet Bangkok Commercial Chumporn Khet Udom Sale and North Bangkok. By spectrophotometric method Fe and F contained in samples were finally measured at 510 om and 570 om respectively.

The purposes of the research were to create and find efficiency validation of computer assisted instruction focused on the office automation practice for the standard 90 / 90 and analyze the student leaning achievement after using computer assisted instruction. The samples were the 17 Bachelor of Business Administration Program in Management Rajamangala University of Technology Phra Nakhon. The researcher experimented by using pretest and then using the computer assisted instruction focus on the practiced to prepare office equipment in learning next the students did the posttest. After that the researcher calculated to find the computer assisted instruction efficiency and analyzed the students learning achievement after studying. The result revealed that the computer assisted Instruction efficiency was efficient for standard 90 / 90. And after studying by using computer assisted instruction the students learning achievement increased significantly at 0.05.

This survey was conducted from 480 samples that were randomly conducted by typical sampling method. Data were collected by using Influence of Marketing sociological factors and attitudes have towards influencing the buying decision of Sufficiency Economic books. questionnaires. The result of this research found that: Marketing factors have effects upon buying decision of sufficiency economic books with factors such as product price place promotion have effect in decision making of buying sufficiency economic book at 0.05 significance level. Sociological factors also show influence in buying sufficiency economic books with attributes such as family values source of news social class and social values affecting decision of buying sufficiency economic books at significant level 0.05. Attitudes relative effects on buying sufficiency economic books decision making can be segregated into different interest groups. Only attitudes of the group who have heard or aware and the group of applied of concept of sufficiency economy philosophy have no effect on their buying decision. In the group who understand the philosophy attitudes shows no effect towards their buying decision. Lastly in the group who understand the philosophy the outcome shows no relevance on their buying decision. Highly educated group with post graduate studies attitudes have tendency to think that sufficiency economic philosophy tend constraint progress. The higher age group showed limited interest to sufficiency economic philosophy.