Judul: Kajian Efektivitas Penerapan Sistem Manajemen Lingkungan ISO 14001 di PT Pupuk Sriwidjaja Palembang
Abstrak: PT Pupuk Sriwidjaja Palembang (PT Pusri Palembang) is a petrochemical industry that produces urea fertilizer as the main products with four plants with a capacity of 2.09 million tons/year. PT Pusri Palembang is determined to improvised the conservation of the environment by adopting an Environmental Management System (EMS) ISO 14001. This study aims to determine the effectiveness of implementation of ISO 14001 EMS of PT Pusri Palembang. This study was conducted through document review, field observation and questionnaire. Significant Environmental Aspects (SEA) which have been set including urea solution shelter, waste tank (MPAL) and the use of water have been fully effective in terms of compliance with the ISO 14001 EMS standard, the availability of procedures and records, compliance of facility and technology used and the achievement of environment performance accordance with the goals and objectives. Aspect of use energy (natural gas and electricity) are not fully effective because the program can not be made to meet goals and objectives yet.
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Judul: Kajian Efektivitas Penerapan Sistem Manajemen Lingkungan ISO 14001 di PT Unilever Indonesia Tbk. Pabrik Home Personal Care Liquid
Abstrak: ISO 14001 is an international standard used for maintain the Environmental Management System (EMS). The goal of this research is to determine the effectiveness of implementation SML ISO 14001 at PT Unilever Indonesia Tbk. The research method takes two steps, data collection and studies on the effectiveness of EMS ISO 14001. From the results of the study revealed that The specific environmental aspect of PT Unilever Indonesia are air pollution, solid waste, waste water, and hazardous waste. The specific environmental aspect of PT Unilever Indonesia Tbk has been appropriated to the quality standard and the regulatory laws. PT Unilever Indonesia Tbk has been committed to preventing pollution, obeying the rules, and continuous improvement as three fundamental supporting of environmental policy. PT Unilever Indonesia Tbk. also has been commited to establishing, implementing, and maintaining the procedure of identification environmental aspect
Keyword: environmental management system, ISO 14001, environmental policy, evvironmental aspects identification procedure, specific environmental aspect.

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. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular