Judul: Pengetahuan Pekerja dan Pengurus Tempat Penimbunan Kayu Tradisional terhadap Keselamatan dan Kesehatan Kerja
Abstrak: Forestry activities like log yard is an activity that is prone to accidents. Poor understanding about the importance of Occupational Safety and Health (OSH) can increase the risk of accidents. This study aims to describe working conditions in log yard and assess knowledge log yard workers and log pond managers to OSH. Data obtained by direct interviews from the questionnaire using a Likert scale for all respondents and direct observation in the field. Data were processed and analyzed descriptively to get the value of each respondent. Data that has been obtained from the analysis of descriptive processed by finding the difference between the knowledges of the respondents with an assessment based on standards that will be analyzed using the Wilcoxon test. Observations the work environment in log yard showed the value of work climate, noise, and dust were exceeding the allowable threshold value as was stated by Regulations of the Minister of Labor and Transmigration in 2011 about a Threshold Value of Physical Factors and Chemical Factors in The Workplace. The results also showed that the knowledge of the respondents were in very bad category in this topic of (1) OSH basic information, (2) OSH reasons and benefits, (3) rights and obligations of workers and managers, (4) the basic source of dangers information, and (5) the information of threshold value. Knowledge of all respondents were overestimate mean that the respondents count itself has a good knowledge on OSH aspect but they did not actually. Strategies for increasing workers and managers knowledges on OSH aspect can be done by adopting the above-mentioned findings.
Keyword: log yard, threshold value, work environment, OSH

Judul: Peningkatan Aspek Pengetahuan dalam Perlindungan K3 Pemanenan Kayu: Aplikasi Safety Game
Abstrak: Occupational Safety and Health (OSH) in forestry work is very important because of the high level of danger as stipulated in Act No. 1 of 1970, Government Regulation No. 50 of 2012, and ILO Code of Practice on OSH in forestry which has been ratified. However, in its implementation there are practices that are not appropriate and put workers in a position of high risk work, because they didn’t know that their practices are practices that aren’t safe and healthy. Safety Game is an instrumen of learning that can be used to improve the workers knowledge workers of OSH, as an alternative to the counseling, with simple technique, low cost, and flexible time of usage. Assessment using questionnaires showed an increase in knowledge after the use of Safety Game which has varied both in value and significance level corresponding to the influencing factors. Based on observations, there are some improvements that are needed so that Safety Game may function optimally
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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