Judul: Designing an Implementation of Environmental Innovation Strategy towards Proactive Environmental Management: A Case Study in a Ribbed Smoked Sheet Rubber Factory in Central Java Province, Indonesia
Abstrak: Ribbed smoked sheet (RSS) is the second largest natural rubber product in Indonesia after crumb rubber. One of the problems associated with natural rubber processing is the environmental problems created by the use of large amounts of water, together with energy and chemicals that pollute the environment. An environmental innovation is considered as a strategy to address the environmental impacts better than the current end-of-pipe treatment by shifting it into more proactive environmental management. This research aims to explore solutions that are more environmentally friendly for the rubber industry. This study uses a qualitative Case Study approach on a small and exploratory scale, with data collected from interviews and observations. The results show that the environmental issues that are related to the factory’s daily operation are: water usage, accumulation of unprocessed material, the use of ammonia and the use of inorganic fertilizers. The obstacles in the way of environmental management are: financial issue, human resources, communities’ pressure, technological change and communication with environmental experts. Some proactive strategies to overcome these environmental issues are suggested namely: reuse of the wastewater and pollution prevention at sources. The results of this study also suggest conducting cooperation with research institutions or environmental experts especially for skills that cannot be controlled by the manager or employees in the company.
Keyword: Ribbed smoked sheet (RSS) rubber, proactive environmental strategies, environmental innovation

Judul: Peningkatan Produktivitas Proses Budidaya Karet Alam dengan Pendekatan Green Productivity (Studi Kasus di PT. XYZ)
Abstrak: Indonesia is the second largest natural rubber producer in the world, with 28% of the total world production in 2010. In line with the growth of the world's automotive industry, the needs of rubber as a complementary synthetic rubber products will also increase. The main objective this research was to find the best alternative strategy to increase the productivity of the natural bber plantations through the green productivity (GP) approach. The case study was conducted at PT. XYZ, a private company which runs in the plantation and processing of natural rubber usinesses. The material flow analysis was performed by using green stream map to analyze the seven Treen wastes. The best alternative strategy was determined by using of AHP model and several design Improvements scenario. The measurement of the alternative strategy performance was rated as the ture GPI and compared with the value of current GPI, which had been calculated on a case study hat was done. The results of this research will be able to provide the best improvement productivity rategy, the level of company's productivity which has been achived, and the productivity levels of The implementation strategy chosen.
Keyword: AHP, Green productivity, Green stream map, Green wastes, Natural rubber, Latex

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh.
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.