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: 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: 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.