This research aims to study the using oil palm fiber to develop cement-bonded fiberboard product. The mixture ratios of Portland cement type1: fine sand: oil palm fiber:tap water: catalyst are 1 : 1.95 : 0.05 : 0.40 : 0.03 1 : 1.94 : 0.06 : 0.40 : 0.03 1 : 1.93 : 0.07 : 0.40 : 0.03 1 : 1.92 : 0.08 : 0.40 : 0.03 and 1 : 1.91 : 0.09 : 0.40 : 0.03 by weight. The cement-bonded fiberboard samples are cast in 30 x 30 x 1.5 centimeter in dimension. The cement-bonded fiberboard sample testing follows the TIS 878-2537. The results show that the density thermal conductivity bending strength modulus of elasticity and tension perpendicular to surface of cement-bonded fiberboard with high quantity of oil palm fiber are lower than cement-bonded fiberboard with low quantity of oil palm fiber while that the water absorption and swelling in water of cement-bonded fiberboard with high quantity of oil palm fiber are higher. However all of oil palm fiber samples with lower than 0.06 of ratio can pass the standard.

This research aims to study the using basalt rock fragments to develop as interlocking block product. The mixture ratios of Portland cement type1: basalt rock fragments are 11 : 6 1 : 6.5 1 : 7 1 : 7.5 and 1 : 8 by weight and water per cement ratio was 0.6 by weight. The interlocking block samples are cast in 10 x 20 x 10 cubic centimeter of dimension with manual compression molding machine. The interlocking block samples were tested in accordance with TCPS 602-2547 standard which subjected for the interlocking block. The results show that the weight compressive strength and thermal conductivity of interlocking blocks with high quantity of basalt rock fragments are lower than interlocking blocks with low quantity of basalt rock fragments while that the water absorption of interlocking blocks with high quantity of basalt rock fragments are higher. From this research the medium and small enterprises could choose the proper ration for the interlocking block production mixing basalt rock fragments as per requirement.

An MV-algebra G is an abelian monoid (G0+) with the operation * satisfying (x*)* = x x + 0* = 0* and (x *+y)*+y = (y*+x)* = x . Let G be an MV-algebra. A function f :G →G is called homomorphism if f (x + y) = f (x) + f (y) and f (x*) = (f (x)) * for all x and y in G . In this research we study the homomorphism and isomorphism theorem in MV-algebra.

This research aims to design and construct small-scale angular rotary macadamia nut cracker machine using angular rotary striking mechanism. The proposed machine can crack 3 sizes of macadamia nuts - 17-22 mm 23-28 mm and 29-34 mm diameter with no need for separation size before feeding into the machine. Results of the experiment showed that the proposed angular rotary macadamia nut cracker machine could be used exactly as designed. Its average efficiency in separating sizes before cracking was 83% with overall productivity of 7.75 kilograms per hours. With regard to cracking process it was found that weight of the cracked macadamia nut was 29.75% of the whole macadamia fruit. The other 70.25% was weight of the shell. Furthermore it was also found that regarding quality of the cracked macadamia nuts the whole-nut quality was 39% the half-nut quality was 44% and the broken- nut quality was 17% respectively.