Judul: Green Supply Chain Management in Indonesian Crumb Rubber Factories: Designing Strategies towards Implementation.
Abstrak: Green supply chain management (GSCM) is a new technical innovation that has been touted to improve supply chain performance as well as minimize the environmental impacts. Unfortunately, this concept has not been entirely implemented in Indonesian rubber industries. The primary objective of this research were identify current green practices, to explore influencing factors and formulate green approach as well as select strategies to accelerate GSCM implementation in Indonesia’s crumb rubber factories (CRFs). The case studies were conducted in two private CRFs. The data were collected through semi-structure interviews with stakeholders, field observation, and examination of QMS documents. The GSCM model for CRFs was constructed, and the influencing factors were analyzed through thematic analysis through the lens of innovation diffusion theory. The Analytical Hierarchy Process was employed to prioritize the strategies. The findings suggest CRFs have not committed themselves to integrating the environmental management intentionally into the current production system; their motive of green efforts may be more to maximize efficiency and reduce the cost production rather than to be more environmental friendly. The results reveal that technological, organizational and environmental factors may influence the decision on GSCM adoption. In addition, green procurement which emphasizes increasing the quality of raw material from the rubber block supplier and educate farmers or supplier are the prioritized green approach to accelerate GSCM implementation. The practical results of this research provide valuable insights and guidelines for CRFs to integrate the green concepts into operational business strategy.
Keyword: Green Supply Chain Management, Innovation Adoption, Influencing factor, Crumb Rubber Factories

Judul: Sistem Penunjang Keputusan Manajemen Rantai Pasok Karet Alam dengan Pendekatan Green Supply Chain Operations Reference (Studi Kasus Di PT. Condong Garut).
Abstrak: Natural rubber is one of the important agricultural commodity for Indonesia and international scope. In Indonesia, especially in Java, one of the biggest industry of rubber was located in Kabupaten Garut, West Java. Approximately less than 95 km from the capital city of Garut, with a height of 600- 800 meters above sea level, there is a private company that has a total area of 2.741,81 hectares of rubber plantation area. Besides having a rubber plantation, the company has several rubber processing plant adjacent to the rubber plantations. Every day in the process of harvesting rubber latex in which the results of the harvest will be sent to a processing plant rubber. Latex has received factory will be transformed into a number of derivative products quality natural rubber, such as Ribbed Smoked Sheet and Brown Crepe. But in reality, the rubber plantation land productivity is on the decline so that the quality of the resulting latex was also less than satisfactory. One of the main problems is the management of the crude rubber plantation, such as the main treatment plant fertilization and weed eradication is rarely done. In addition, new clones, which have much higher productivity latex unrecognized. Low productivity of rubber plantations can also be caused by low quality seeds, farm land use that is not optimal, and poor maintenance of plants. If left longer the issue, it is feared the quality and quantity of the product also decreased. Decline in the quality and quantity of the product can reduce corporate profits as the number of high quality products that will be offered to consumers is limited. In fact, productivity declined latex not be a reason for the limitations of the company's revenue, since the company can maximize the production process so as to produce elections prospective potential consumers to buy quality products with a lot quantity can be determined. In addressing the limitations of the company's revenue for the problems that exist in the agrorubber, decision makers are faced with determining how rational decisions to be taken and make the right choice quickly and accurately. Decision support system is a form of evolution of electronic data processing and information management systems that are focused on helping top management and executives make decisions and rely on the flexibility, adaptability and rapid response, which can be controlled by the user (Suryadi and Ramdhani 1998). Decision support systems in this study can also help decision-makers to choose alternatives such decisions result of processing the information obtained. In addition the system is equipped with a selection of models that are representative of the problems that exist in the company, the development of this system is also integrated with supply chain management to facilitate any information and products, ranging from suppliers to consumers, in order to create a relationship orderly from upstream to downstream so that the measurement of the supply chain can be measured. The methodology of this research consists of the analysis of system requirements, formulation issues, and identification systems. Meanwhile, conducted the research stages of data collection and information by observation and
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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