Judul: Analysis of water sufficiency in a star fruit (Averrhoa carambola L) orchads
Abstrak: Problem faced by star fruit farmers in Depok, West Java, is water availability relying only on rainfed which the quantity is always unevenly distributed in each year. The abundant water availability during the rainy season has not been optimally utilized so that water stress often occurs during the dry season. Therefore, research related to water conservation technique for optimum utilization of rain water and runoff for star fruit in that area was conducted. The objectives of the research were: 1) to develop water balance analytical model with and without runoff for the sweet star fruit orchard, 2) to find out the effectiveness of water harvest technique using infiltration canal and silt pit to control runoff and change soil water content at the star fruit orchard, and 3) to find out the relationship of evapotranspiration and star fruit productivity. In this experiment the water table was approximately 16 m from the soil surface, no irrigation was used and infiltration canals equipped with silt pits were constructed so that runoff component and contribution of water capillarity movement were zero. The research results showed that: 1) the water balance analytical model without runoff could nicely simulate the soil water content at the rooting zone with R2 of 0.83 and RSME of 0.001; 2) the water balance analytical model with runoff could nicely simulate the soil water content at the rooting zone with R2 of 0.82 and RSME of 0.007; 3) the water harvest technique was effective in controlling runoff which was indicated by the higher soil water content at the rooting zone ranging from 0.429 to 0.458 m3/m3 with an average of 0.452 m3/m3 as compared to control (with no water harvest technique) ranging from 0.362 to 0.458 m3/m3with an average of 0.417 m3/m3; 4) productivity of the star fruit increased with the increase of evapotranspiration as expressed by the following linear regression equation: Y = 0,299X – 13,93 with R2 of 0.74, F value of 5.56 at p~0.81, indicating that evapotranspiration had influence on the star fruit productivity.; and 5) with water harvest technique treatment (infiltration canal with silt pit), the value of soil water content at the star fruit orchard was in good condition for the growth and year-round production of the star fruit plants.
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Judul: Pengembangan Model Bisnis Produk Manisan Belimbing Manis (Averrhoa carambola L) Kering
Abstrak: Star fruit is one of agricultural commodity which is perishable, that leads to quality declining and limited availability in market. Dried-candied star fruit processing is one of technology process alternatives in order to extend product shelf life. The research was based on technopreneurship program and consisted of three main stages such as initial business model identification, product profile development, and business model development. Initial model business was identified by determining assumptions of nine business model elements. Product profile development stage generated the best formula of dried-candied star fruit was immertion fruit in a solution of lime 0,1% for 1 hour with concentration of sugar solution 30%. Result of business model development in value propositions were as snack which is expected to be healthy and practical, free of preservatives, and contain vitamins for human body endurance. Customer segments were women aged 19–45 years old who would like to consume snacks and fresh or processed fruits. Revenue streams obtained by selling the product in channels such as sweet confectionary store, gift shop, retailer, and wholesaler.
Keyword: star fruit, dried-candied, business model

Judul: Sintesis Paduan Ti-6Al-4Nb sebagai Matrial Implan Pengganti Komponen Tibial
Abstrak: Synthesis of Ti-6Al-4Nb alloy was done by melting using Tri Arc Melting Furnace. Each sample was remelted five times to ensure the homogenity. Aluminum and niobium addition were expected to stabilize α phase and β phase until the αβ-titanium alloy was resulted. Yet based on the experiment, it was α-titanium alloy resulted. α-titanium alloy was a Hexagonal Close Packed (HCP) crystalline structure which would be cracked if deformation non-uniaxial happens. The presence of oxygen in pure titanium significantly increased the hardness of titanium. The addition of aluminum was also able to increase the hardness of titanium alloy because aluminum more stabilize the α phase in the α-titanium alloy. The corrosion ressistance of titanium could be increased by adding aluminum and niobium. Titanium coating with HA/chitosan composite was also proved in decreasing the corrosion rate because it barried direct interaction between titanium alloy and corrotion solution.
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