The objects of this research were (1) to study Third-Year Students’ stress at Faculty of Business Administration Rajamangala University of Technology Phra Nakhon. In Overall and each of four aspects: learning management study skills learning environment and relationship with classmate. (2) To compare stress of Third – Year Students Stress at Faculty of Business Administration. In overall and each aspect classified by gender major group grade point average (GPA) place of birth family economic status the inter personal relationship between student and parents child. The simple consisted of 439 Third – Year Students Stress at Faculty of Business Administration. The statistics used for analysis the data were frequency percentage mean standard deviation t-test one way analysis of variance and LSD. The result of the study revealed that: 1. Male and female students had significant different of stress on relationship with friends at .05 level. 2. Students with different major group had significant different on overall stress at .05 level. 3. Students with different grade point average (GPA) had significant different of stress on relationship with friends at .05 level. 4. Students with different family economic status had no different of stress. 5. Students with different place of birth had no different of stress. 6. Students with different interpersonal relationship patterns had no different of stress. 7. Students whose parents had different child rearing styles had different stress in learning management study skills and learning environment significant at .05 level.

This research studied the factors that affect the efficiency of phosphate reduction in the wastewater of the washing process with CaCO3 and CaO produced from eggshell and mussel shell. The study found that the optimum condition for adsorption when using CaCO3 from eggshell is to adjust the pH to be equal to 10 take 15 minutes to absorb and add 1 gram of sorbent which can reduce the phosphate content by 25 percent and when changing the adsorbent to CaO the optimum condition for phosphate removal is to adjust the pH to 7 take 15 minutes to absorb and add 1 gram of adsorbent which can reduce the phosphate content by 24 percent. The optimum conditions for adsorption when using CaCO3 from mussel shell were to adjust the pH to 10 take 45 minutes to absorb and add 1 gram of sorbent which can reduce the phosphate content by 25 percent and when changing adsorbents to CaO the optimum condition for phosphate removal is to adjust the pH to 10 take 15 minutes to absorb and add 3 grams of adsorbents which can reduce the phosphate content by 24 percent. In addition when studying the adsorption of impurities in the wastewater such as conductivity turbidity COD and BOD it is found that the optimum reduction conditions can reduce the impurities of the parameters that mentioned above were 19.32 2.60 54.77 and 16.67 percent respectively. CaCO3 and CaO produced from eggshell and mussel shell can be used to absorb impurities in wastewater before releasing into natural water sources.

The purpose of this study is to produce the soil improvement materials from food waste and water hyacinth by using a dehydration process. The experiments were divided into two parts : 1) the study of the optimum temperature and time for converting food waste and water hyacinths to soil improvement materials by determining the temperatures of 100 °C 150 °C and 200°C in the periods of 1 hour 2 hours and 3 hours respectively 2) the study of nutrient content in the materials before and after mixing into the soil for 5 days. The soil used in the experiment was sampled from Sai Ma Subdistrict Nonthaburi Province. The parameters used to evaluate the ability to improve the soil quality were soil moisture pH electro conductivity total nitrogen total phosphorus total potassium and organic matter. The results showed that the optimum temperature for drying the food waste was 150°C for 2 hours and the optimum temperature for drying the water hyacinth was 200°C for 3 hours. When the materials were mixed into soil it found that the soil drainage was improved. Mixing the materials into soil could increase the pH value from 5.2 to 5.4 and increase the electrical conductivity from 0.72 mS/cm to 14.78 mS/cm. Besides the plant nutrients including Nitrogen phosphorus and potassium also increased after adding soil improvement materials.

This research aimed to study the optimum conditions for making raw lime from shells which consisted of 9 conditions: calcined at three levels of 700 800 and 900 degrees Celsius for 1 2 and 3 hours. Calcium element content in raw lime using X-ray fluorescence (XRF) measurement and structural analysis of calcium compounds by X-Ray Diffraction (XRD). The research results were found. 1. Optimal conditions for making lime mortar are temperature 800 degrees Celsius duration 2 hours. The physical characteristics of raw lime are white and porous. 2. The calcium content from the shells calcination at 800 degrees Celsius for 1 2 and 3 hours was 98.22% 96.70% 97.89%. 3. Changes in the calcium compounds of raw lime obtained by calcining the shell at 800 degrees Celsius for 1 hour were mainly found in the form of calcium carbonate (CaCO3). At 2 3 hours calcium carbonate (CaCO3) is mostly converted to form calcium hydroxide (Ca(OH)2)compound calcium oxide (CaO) compound is formed.

The purposes of this research were to study attitudes towards work organizational atmosphere and relationship between attitudes towards work organizational atmosphere and work participation of the Government Lottery Office employees. The research sample consisted of 260 Government Lottery Office employees drawn from probability sampling and simple random sampling. The statistics used for data analysis were frequency percentage mean standard deviation and Pearson product moment correlation coefficient. The study results indicated that the Government Lottery Office employees’ attitude was at a high level. When considering each aspect it was found that attitude regarding work performance had the highest average value and work participation was also at high level. It was found that accepting assigned responsibilities had the highest average value. The results of the hypothesis testing revealed that in the overall the attitudes towards all aspects and the organizational atmosphere positively correlated with the Lottery Office employees’ work participation statistically significant at the 0.01 level.