This research aims to develop the natural-rubber floor tiles mixed with high fineness ethylene vinyl acetate plastic wastes (EVA plastics) from the factories. The study use natural-rubber STR 20 at 100 phr with various contents of EVA plastics (e.g. 0 5 10 20 40 and 80 phr) and then mixed with chemical substance at constant ratio include zinc oxide at 5 phr stearic acid at 2 phr mercaptobenzothiazole at 0.5 phr diphenyl guanidine at 0.2 phr and sulfur at 3 phr. The samples are ground by two-roll mill and formed by compression molding at 150 degree Celsius with 30x30x0.2 cm of dimension. The properties of the natural-rubber floor tiles are tested under ASTM standard. From the results it is found that the natural-rubber floor tiles mixed with 10 phr of EVA plastics is the suitable ratio for using as the rubber floor tiles in building. This ratio can increase the hardness tensile strength and wear resistant properties and decrease the density and thermal insulation properties when compare to the natural-rubber floor tiles without EVA plastic.

Education and research is being Develop material that is mixed between rubber and rubber tree’s leaf for product designing. For product design This study is the use of a water timber with a rubber material. For use in product design Type of use and home decoration. In order to achieve the objectives of the research. The research was conducted by researchers at various stages. Data analysis and presentation. In the first part of the research questionnaire has been prepared for the development of product design. The study showed that the structure and the rubber leaves are fragile. It has adopted a water timber to merge. The experimental trial showed that the water timber formwork period is a major cause of water in the rubber sticking to the timber structure. When the latex has chemical and log Waldemar Carlo Night a period of use should not exceed three months at a water timber should be done with low viscosity. The color of the water timber must have a milky white. The collected data before designing it. The researcher has prepared all the tools of the 150 series found that most respondents as guest female age range 25-45 years as the rubber leaves of 94 percent 62.7 opine that the rubber leaves can be. made products of 5-10 species and the collection of data about materials latex with a rubber to make products from those carrying ask 150 people are of the opinion that it should make products partition 32.7 percent secondary. followed by the production of upholstered furniture 20.7 percent and 14.7 percent from the wallet to store data the researcher chose to put the material into a water timber with a rubber curtain room couch and wallet. When the prototype the researchers collected data on products made from latex and rubber leaves a series of 100 questionnaires showed that most of the respondents were female. Between the ages of 25-45 years the average undergraduate. There were government officers And have a monthly income of less than 5000 baht by the majority of respondents thought that. Rubber and rubber leaves the work piece is in good shape. Durable medium Can be used to make the products have 10-50 species with characteristics of both latex and rubber leaves. And all should be improved The research found that people are more interested in a piece of sheet material from a water timber with a timber. For product design Due to a combination of natural materials as a new material with a rubber-patterned rubber leaves a unique structure. It can also be improved by a more specific latex formulation. To be able to make the product even more.

The objectives of this research are to propose a linear mixed model (LMM) for spatial time series with a seasonal component to apply the proposed model to monthly rubber yields in southern provinces of Thailand to forecast rubber yields in southern provinces of Thailand and to compare the performance of the proposed model to the Holt-Winters Additive Exponential smoothing model (Holt-Winters ES) and the seasonal autoregressive integrated moving average model (SARIMA). The proposed model is a linear mixed model (LMM) with spatial effects following a conditional autoregressive model (CAR model). Seasonal dummy variables and Fourier terms are two methods used to account for the seasonal effects. A Bayesian method is used for parameter estimation. The estimated monthly yields are used to forecast the monthly rubber yields. The dependent variables are the monthly rubber yields in each province. The effects considered are spatial effects heterogeneity effects and seasonal effects. The data are secondary data at a provincial level. The results show that the effects influencing on the amount of rubber yields are spatial heterogeneity and seasonal effects. The proposed model with sesonal dummy variables is the most appropriate model copared to the LMM with Fourier sesonal effects Holt-Withers ES and SARIMA. The mean absolute errors (MAE) are smallest in both model fitting and model validating parts. The proposed model with sesaonal dummy variables should be the first consideration for forecasting spatial time series with a seasonal component.

The purposes of the study were to investigate factors affecting the organizational commitment explore organizational culture and examine work life quality of the employees which affected their organizational commitment at Rubber Authority of Thailand Headquarters. The questionnaire was applied to collect data from the 200 employee samples selected by proportional stratified random sampling at Rubber Authority of Thailand Headquarters. The data collected were analyzed by the percentage distribution mean and standard deviation; and t-test f-test and multiple regression analysis resulted at 0.05 statistical significance. The study results revealed that most of the samples were single females who were 30 years of age in the average or less holding bachelor degrees and having been working for five years or less. It was found that their organizational culture concerning clan culture achievement culture bureaucratic culture and adaptability culture highly resulted in high work life quality including organizational pride social relation safe and sanitary workplace work independence work progress and security work administration and employees’ capacity development were high. However the aspect of justified and sustainable income organizational commitment in terms of psychology norm and work tenure were average. The study results revealed as follows. 1) Different personal factors concerning the employee’ age education status and tenure range did not differ in the organizational commitment 2) the organizational culture had impact on the organizational commitment were clan culture achievement culture bureaucratic culture and adaptability culture. 3) Work life quality resulted in organizational pride social relation work administration employees’ capacity development and work progress and security 4) Organizational culture and work life quality had better impact on the organizational commitment than the organizational culture which included aspects on organizational pride social relation employees’ capacity development work administration and work progress and security. It was found that main organizational cultures were achievement and clan cultures.

This study examines Thailands domestic and export market situation with regard to rubber smoked sheet no.3 (RSS3). Time series analysis is used to estimate trends in order to forecast the export of RSS3 during January 2557 – December 2561 using monthly data from 2542 – 2556. The results show that export volume of RSS3 is likely to increase every year in the same month. The volume of exports in December in every year is the most abundant. However as the volume of product increases every year the rubber price keeps falling. As a result farmers and entrepreneurs would benefit from government expansion of the market by the establishment of a domestic industry as an alternative support for output rather than sole reliance on export.