Judul: Perspektif Kelestarian Pesut Mahakam (Orcaella brevirostris Gray, 1866) Berdasarkan Habitat serta Persepsi dan Sikap Mayrakat (Studi Kasus Masyarakat sekitar Danau Semayang dan Danau Melintang), Kinerja Pengelolaan dan Strategi Pengembangan Wisata Alam Situ Gunung Taman Nasional Gunung Gede Pangrango.
Abstrak: Irrawaddy dolphin (Orcaella brevistoris) is a protected spesies area and in Appendix I of CITES 2009. Objectives of this study were to analyze the relationship between perception and attitudes of the community with the habitat conditions of the irrawaddy dolphin in Semayang Lake and Melintang Lake for irrawaddy dolphin sustainability and also formulating efforts to conserve irrawady dolphin. This study was conducted in Semayang Lake, Melintang Lake, and its surrounding on July to August 2009. Tools and materials used in this study were a questionnaire, bottled water samples, the rope with weights, secchi disc, litmus paper, watches, net and motorboat. Data in this study consisted from two main types data, which were irrawady dolphins’s habitat characteristic and data of community perceptions and attitudes about irrawaddy dolphins. Enclosed questionnaires and interviews methods used to obtain data of perception and attitudes. likert scale used to analyze data of community perception. Descriptive analysis used to analyze community attitude data. Community perceptions of irrawady dolphins were positive, based on likert scale analysis. Government rules very affected in conservation action to irrawady dolphin;s conservation action and have highest value compared to another variables and the score was 523 with the average was 4, 36, and it’s mean that the community realized that government was very important to irrawaddy dolphin’s sustainability. Based on interview result to the community, there were some attitude which have negative impact to irrawaddy dolphin’s habitat which were throwing the garbage to the water. The depth of Semayang Lake was (1,15-2 m) and Melintang Lake was (0,75-1,5 m) and impossible for irrawady dolphin to live there due to their large body size. Fish productivity in both lake is very low, which were 1,8 kg/net/day in Semayang Lake and 2,25 kg/net/day for Melintang Lake. Water traffic frequency in mouth area of Pela River in holiday is higher (55 times/hour) than in working day (54 times/hour). Lack productivity of fish and water traffic caused Irrawady dolphins could not be found in both lake because irrawady dolphins preferred area which have a lot of fish and calm stream water. Based on problem above, there some action can be done for irrawaddy dolphins sustainability which are managing habitat, setting the habitat as a conservation area, dredging the lake, make alternative way in water traffic, law enforcement, and make law about fishing procedures. Delivering information to the community about environment health education can be done to change community attitude that related to irrawady dolphins sustainability. Knowledges about environment health is very important to raise people awareness about the importance of Irrawaddy dolphins.
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Judul: Re-Design of mahakam irrawaddy dolphin (Orcaella Brevirostris Gray, 1866) conservation based on distributional changes in Mahakam River, East Kalimantan
Abstrak: The intensive bio-ecological research on the Mahakam dolphins (Orcaella brevirostris Gray,1866) from 1997 to 2004 revealed that there were two core habitats/core areas with high dolphin densities in the Mahakam River i.e. the MuaraPahu-Penyinggahan area and Pela-Muara Kaman area. Since 2007, there have been unusual occurrences within the distribution of the Mahakam dolphins. The core habitat of Muara Pahu-Penyinggahan, which was previously known to support a large population of Mahakam dolphins has apparently been left. The changes in distribution were also detected in 2010 when the population monitoring was conducted and no individuals were found in the Muara Pahu-Penyinggahan core habitat . The Mahakam dolphins are now more concentrated in the area of Muara Muntai and in their other core habitat, Pela-Muara Kaman. This research aimed to reveal whether the changes in distribution were persistent and to respond to this phenomenon by improving the conservation design. To predict the persistency of these changes population dynamics, habitat and socio-political environmentv(policies) were studied and formed the research goal.. Thus, the research objectives of this dissertation are as follows: 1) predicting the survival of the Mahakam dolphin population for a period of100 years, 2) analyzing the characteristics of the Mahakam dolphin habitats; 3) evaluating the effectiveness of coordination and consistency of the Mahakam dolphin conservation policies; and 4) perfecting the design of dolphin conservation to accommodate the current situation of the population, the Mahakam dolphin habitat and socio-political environment that support the conservation efforts. The research on the population of Mahakam dolphins in 2012 revealed that the individual number of Mahakam dolphins, the number of births, and the number deaths were as many as 92 individuals, 5 individuals, and6 individuals, respectively. This research also demonstrated that changes in the distribution of dolphins had occurred inMahakam River. The Mahakam dolphins do no longer live in their core habitat of PenyinggahanMuaraPahu. Currently, the dolphin habitat is concentrated in the core habitat of Pela-Muara Kaman. The changes in the distribution indicate that further shrinkage in the habitat of Mahakam dolphins has occurred Mahakam River. As a result of this, an analysis on the survival of the Mahakam dolphin population was conducted. The results of the analysis predict that the life chances of the Mahakam dolphin population in the next one hundred years are less encouraging as the number of individuals will continue to diminish. The only scenario that predicts a stable dolphin population in one hundred years is when the mortality rate of dolphins is reduced to two individuals per year with the conditions that there is no further shrinkage of habitat, which will result in the reduction of its carrying capacity, and the birth rate is maintained at five individuals per year. vii Networks for coordination for dolphin conservation, which includes 16 organizations have not been effective. There has been a lack of coordination in most networks especially related to organizations/actors included in groups (factions) that work in WestKutai Regency. The lack of coordination started from the time when the dolphins moved away from their conservation area and habitat in Muara Pahu. There has been no coordination
Keyword: Mahakam dolphins, probality of survival, probality of survival, strengthening of coordination, redesign of conservation

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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