Estuary ecosystem has an important role in supporting the life of shrimp. High productivity and the availability of natural food in the estuary ecosystem, will indirectly affect the growth of shrimp. Penaeus monodon and Penaeus merguiensis were two species of shrimp that had economic value with high demand. The purpose of this study was to determine the biological aspects of Penaeus monodon and Penaeus merguiensis shrimp at estuary of Tukad Aya, Bali. Data collection was carried out in February-March 2019 using quantitative descriptive research methods. The determination of the research station was done by purposive sampling. The results showed the total number of shrimps were caught 1,756 individuals, which consist of Penaeus monodon 151 individuals, Penaeus merguiensis 224 individuals and 1,325 individuals of other shrimp. The composition of Penaeus monodon (8.6%) was less than Penaeus merguiensis (12.76%). Shrimp length measurements were divided into 9 groups with a range of values of 55.15-189.95 mm in Penaeus monodon and 31.3-140.1 mm in Penaeus merguiensis. The results of the length and the weight regression in both species of shrimp obtained the value of b <3 so that the growth pattern of shrimp was categorized as negative allometric where length growth was faster than weight gain.

Along development of technology from time to time, makes the shipping sector have experienced development. This made the Indonesian geverment place the maritime sector into a priority program in national development. The development of ships occur from various scopes, this things takes the development of ships in terms of the number of hulls such as single hull (monohull), double hull (catamaran), and with three hulls (trimaran). This research uses a literature method that will analyze the results of previous research related to the ship’s performance. The purpose of this research to determine the best performance between ships with monohull, catamaran and also trimaran forms. The results of this research are expected to be a basic reference for selecting the ship’s hull to be fabricated in the future, whether in terms of tourism, military, etc. the results of this research indicate in terms of stability ships with trimaran hulls have good stability among others. This is because trimaran ships have a larger surface area than monohull and catamaran. With the ratio of the width and height of the ship makes the catamaran have good stability. In terms of resistance, catamaran ships have the smallest resistance than others, but this influenced by the demihull distance factor which makes the waves formed from each hull not collide with each other. In terms of seakeeping, the catamaran is the best in case of heaving, rolling and pitching conditions from all heading angles.

The use of steel (armor) in military vehicle designs is increasingly dominating and is predicted to continue to increase in the future as research and material engineering are carried out. This is a necessity considering that armored military vehicles must be required to have high anti-ballistic capabilities, but on the other hand, of course, still have agility in maneuvering on the operating field. Optimal ballistic performance is closely related to material strength, material constituent content, material hardness and high strain rate behavior of materials used in military vehicles. Currently, the most widely used armor materials are RHA (Rolled Homogeneous Armor) and High Hardness Steel (HB 550). RHA itself is often used for armored vehicles because of its ability to absorb and deflect kinetic energy from ammunition / ballistics. This right is because RHA is a homogeneous plate that has the same hardness and structure throughout because it involves a new process called rolling. Meanwhile, HB 550 is known to have a fine grain microstructure, high level of hardness and toughness obtained from the alloying process of two types of steel, namely high strength low alloy steel (HSLA) and wootz steel and followed by quenching technology. From the results of studies and literature reviews, it is known that in RHA steel, ballistic resistance is closely related to the adiabatic shear band transformation due to softening and thermal strain associated with the collision moment that occurs. While on the HB 550, it is recommended that the minimum thickness value of the plate to produce an optimal level of ballistic protection is 14.5 mm for the FB7 and 13 mm for the 7.62 mm AP bullet.