Judul: Penerapan Pemodelan dalam upaya Perlindungan dan Pengelolaan Beban Pencemaran Air (Studi Kasus: Sungai Lalindu Kabupaten Konawe Utara Sulawesi Tenggara)
Abstrak: Sungai Lalindu adalah sungai terbesar di Kabupaten Konawe Utara dengan panjang aliran ± 96 km dari hilir. Panjang tersebut Sungai Lalindu tidak terlepas dari pengaruh aktivitas masyarakat, seperti pertambangan, pertanian, domestik, dan perkebunan. Aktivitas di atas menyebabkan penurunan kualitas air sungai Lalindu sehingga peruntukan air sungai menjadi tidak tercapai. Salah satu aktivitas yang mengancam akan kualitas air adalah sektor pertambangan, dimana laju alih fungsi lahan dari hutan ke pertambangan cukup tinggi, pergeseran fungsi lahan yang signifikan dan berkelanjutan, ini menyebabkan kapasitas infiltrasi menurun dan air larian (Run Off) meningkat. Penelitian ini sudah dilakukan di Sungai Lalindu Kabupaten Konawe Utara di bulan Januari sampai Maret tahun 2023, dengan tujuan: (1) Menganalisis status mutu air Sungai Lalindu mempergunakan metode Canadian Council of Ministers of the Environment (CCME), (2) Menganalisis alokasi beban pencemaran sungai Lalindu dengan metode Qual2kw dan (3) memberikan usulan strategi dan rencana aksi perlindungan dan pengelolaan mutu air sungai Lalindu agar sungai tersebut memenuhi baku mutu air yang ditentukan. Hasil analisis status mutu air dari 6 parameter mempergunakan metode CCME secara keseluruhan sungai Lalindu menunjukan nilai 65.58 artinya sungai tersebut dalam status cukup yaitu kualitas air biasanya aman, tetapi terkadang terancam serta terganggu; keadaan kadang menyeleweng dari tingkat yang alami ataupun ideal, ini disebabkan tingginya nilai Total Suspended Solid di seluruh titik pengukuran yang telah melewati baku mutu kelas III, nilai Total Suspended Solid mengingkat karena erosi yang tinggi dan konversi lahan dari hutan sekunder menjadi lahan pertanian dan pertambangan pada hulu sungai. Hasil modeling yang dilakukan pada Daerah Aliran Sungai Lalindu, parameter Total Suspended Solid menunjukkan nilai alokasi penurunan beban pencemar sebesar 2.938.946,29 kg/hari yang terbagi pada empat segmen yaitu pada segmen 1 1.343.686,635 kg/hari, pada segmen 2, 3 dan 4, masing-masing nilai penurunan beban sebesar 250.818,058 kg/hari, 253.209,60 kg/hari dan 1.091.232.000 kg/hari. Usulan strategi dan rencana aksi dalam upaya penurunan beban pencemaran parameter Total Suspended Solid adalah industri lama harus membuat settling pond dan kegiatan reklamasi ditingkatkan serta penerapan baku mutu air limbah pertambangan di perketat, sedangkan industri baru mewajibkan memanfaatkan air limbah dan membuat settling pond., Lalindu River is the largest river in North Konawe Regency with a flow length of ± 96 km from downstream. The length of the Lalindu River is inseparable from the influence of community activities, such as mining, agriculture, domestic, and plantations. The above activities cause a decrease in the quality of Lalindu river water so that the designation of river water is not achieved. One of the activities that threaten water quality is the mining sector, where the rate of land conversion from forest to mining is quite high, a significant and sustainable shift in land function, this causes decreased infiltration capacity and increased run-off. This research has been conducted in the Lalindu River of North Konawe Regency from January to March 2023, with the aim of: (1) to analyze the water quality status of the Lalindu River using the Canadian Council of Ministers of the Environment (CCME) method, (2) to analyze the allocation of pollution load of the Lalindu River using the Qual2kw method and (3) to provide a proposed strategy and
Keyword: Qual2kw, pencemaran air, status mutu air, sungai, Keberlanjutan

Judul: Model konservasi sumberdaya air pada perkebunan kelapa sawit yang berkelanjutan (Studi Kasus: Sub DAS Lalindu, Kabupaten Konawe Utara, Provinsi Sulawesi Tenggara)
Abstrak: Oil palm development in Indonesia is facing problems related to the availability of land and allegations most environmental activists who consider that land clearing for palm oil has caused massive environmental damage. Land conversion to oil palm plantations in terms of ecology will lead to disruption of both quantity and quality hydrology hydrology of watersheds (DAS) and the degradation of land and result in a decrease in soil fertility and loss of biodiversity. The expansion of oil palm plantations continue to occur, including in Southeast Sulawesi province spread in almost all districts. Konawe North, particularly in watersheds that are subdistrict Lalindu Wiwirano is one area which is used as a priority area of development of this commodity. Management of oil palm plantations now need to refer to the concept of sustainable management of oil palm plantations to meet the interests of all stakeholders involved in the palm oil issue. In the plantation sub-sector, the ultimate definition of sustainability which is the result of the 3rd Roundtable Meeting on Sustainable Palm Oil (RSPO 2005) in Singapore which states that sustainable plantations is a business that is able to meet the economic growth (profit), protection of the environment (planet) and social equity (people). While in Indonesia known as the Indonesian Sustainable Palm Oil System (ISPO) which is a policy taken by the Indonesian government in this case the Ministry of Agriculture with the aim to improve the competitiveness of Indonesian palm oil in the world market and to participate in order to meet the commitment of the President of the Republic of Indonesia to reduce greenhouse gases and give attention to environmental issues. This study aims to: (1) Assess the condition of existing land cover changes that occurred and the physical, economic, social and environmental flora and fauna in the area of oil palm plantations in sub-watershed Lalindu, Konawe North, (2) Assess the conservation of water resources in development of oil palm plantations in sub-watershed Lalindu, North Konawe and (3) to model the conservation of water resources on a sustainable oil palm plantations in sub-watershed Lalindu, North Konawe. The study site is in the area of oil palm plantations in the district Wiwirano, North Konawe, one of the districts in the province of South East Sulawesi with the capital Wanggudu. This study used a variety of methods of analysis. To answer the first objective, used descriptive analysis, regression and correlation analysis and spatial analysis. Descriptive analysis is used to explain phenomena which are qualitative. Hydrologic analysis used to answer the second objective is to use the model tank. As for the third objective answer, used the analysis of dynamic systems using Stella software and descriptive analysis discusses the institutional management of oil palm plantations. The results showed that land use changes occur at the sub-watershed Lalindu allocated for oil palm plantations, resulting in changes in hydrologic characteristics, land cover changes of Imperata grasslands and forests into oil palm and land use changes. The impact of changes in land cover that occur in sub-watershed Lalindu affect vii run off, biodiversity of flora and fauna (biodiversity)
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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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