Judul: Bali cattle are native Indonesian cattle that have potential genetic and economic value to be developed. Sekolah Peternakan Rakyat (SPR) of Kuamang Abadi, District of Bungo has wide potential for cattle development, with 90% of the population being Bali cattle. This study aims to determine the performance level of bali cattle production at the SPR of Kuamang Abadi, District of Bungo by looking at morphometric data (body measurements), maintenance management systems (intensive, semi-intensive, extensive) and different age categories. In this study, 185 bali cattle were observed, with various rearing systems and ages. Productivity data were analyzed using descriptive analysis and Factorial Completely Randomized Design (CRD) with 2 treatment factors, namely the maintenance system and age with different replications. The results obtained at the SPR of Kuamang Abadi did not show significant differences in body morphometrics, whether reared intensively, semi-intensively or extensively. Meanwhile, in different age categories, changes in body size were significantly different from each age category (< 1 year, 1-2 years and > 2 years). However, when viewed from the morphometrics of bali cattle at the SPR of Kuamang Abadi the results are quite good.
Abstrak: Kota Bogor termasuk dalam wilayah dengan curah hujan tinggi tahunan rata-rata 3.500 – 4.000 mm sehingga berpotensi terjadinya pemanenan air hujan. Penelitian dilakukan untuk merencanakan volume penampungan air hujan yang dapat diaplikasikan di skala unit perumahan Villa Citra Bantarjati dan merancang alat filtrasi sederhana untuk meningkatkan kualitas fisik air hujan yang dapat digunakan untuk menunjang kebutuhan domestik. Penelitian ini dilakukan menggunakan data primer meliputi luas atap rumah serta data sekunder meliputi data curah hujan maksimum dan penggunaan air. Pengujian kualitas air dilakukan dengan uji kualitas fisik air hujan sebelum dan sesudah melewati filter untuk menghasilkan kualitas air yang memenuhi baku mutu air kelas II. Luas atap digunakan untuk menangkap air hujan sebesar 25 m2, sehingga rata-rata volume ketersediaan yang ditampung pada bak penampungan air hujan adalah 155,31 L/hari dengan faktor kehilangan air akibat limpasan sebesar 20%. Kapasitas bak penampungan air hujan yang memenuhi kebutuhan air domestik adalah 330 L. Perancangan filter sederhana ini mampu meningkatkan kualitas fisik air hujan dengan susunan media filter yang telah ditentukan ketinggiannya. Bahan filter sederhana yang berperan dalam pengolahan air meliputi zeolit dan arang aktif., Bogor city is included in the region with an average annual high rainfall of 3.500 – 4.000 mm so that the potential for rainwater harvest. This research was conducted to plan the volume of rainwater reservoirs that can be applied at the scale of Villa Citra Bantarjati housing units and design simple filtration tools to improve the physical quality of rainwater that can be used to support domestic needs. This study was conducted using primary data covering the area of the roof of the house as well as secondary data including maximum rainfall data and water use. Water quality testing is conducted by physical quality test of rainwater before and after passing the filter to produce water quality that meets class II water quality standards. The roof area is used to capture rainwater by 25 m2 , so the average volume of availability accommodated in rainwater reservoirs is 155.31 L/day with water loss factor due to runoff of 20%. The capacity of rainwater reservoirs that meet domestic water needs is 330 L. The design of this simple filter is able to improve the physical quality of rainwater with a predetermined arrangement of filter media. Simple filter materials that play a role in water treatment include zeolite and activated charcoal.
Keyword: Filter, water availability, water quality, rainwater reservoir

Judul: Rainwater Harvesting System Design in International  Dormitory of IPB Dramaga Campus
Abstrak: Curah hujan yang tinggi di Bogor mencapai 3500 mm melebihi rata-rata curah hujan nasional antara 2000 – 3000 mm. Pemanenan air hujan cocok untuk dilakukan sebagai langkah konservatif yang dapat dilakukan IPB University dalam upaya pemeliharaan sumber daya air yang berkelanjutan. Penelitian ini bertujuan mengetahui banyaknya suplai air hujan yang dapat dipanen, menghasilkan desain sistem PAH serta RAB instalasinya, dan mengetahui penghematan air serta biaya yang dapat dicapai melalui sistem PAH. Penelitian dilakukan dari Februari – Mei 2024 dengan pengambilan data primer berupa luas atap bangunan dan informasi kebutuhan air bersih, serta data sekunder berupa curah hujan tahun 2000 – 2023 Stasiun BMKG Jawa Barat. Potensi volume air hujan yang dapat dipanen 1230 – 2134 m3 dengan rata-rata suplai 1603 m3 per tahun. Desain sistem pemanenan PAH yang dirancang menggunakan tangki FRP berkapasitas 28 m3 dengan dimensi 7 m x 2 m x 2 m. Talang dipasang dengan kemiringan seragam ½% dan pipa datar dengan kemiringan seragam 1%. Variasi ukuran pipa dan talang yang digunakan antara 1 – 10 inch. Besarnya biaya yang dibutuhkan untuk instalasi PAH sebesar Rp143.000.000,00. Penghematan air aktual yang dapat tercapai melalui sistem PAH sebanyak 44% – 75% dari kebutuhan air tahunan dan menghemat biaya lebih dari 120% dari investasi awal., High rainfall in Bogor reached 3500 mm, exceeding the national average rainfall between 2000 – 3000 mm. Rainwater harvesting is conservative step that IPB University can take to maintain sustainable water resources. This research aims to determine amount of rainwater supply that can be harvested, created PAH system design and installation RAB, and determine water and cost savings that can be achieved through PAH system. The research was conducted from February – May 2024 by collecting primary data of building roof area and information of clean water needs, and secondary data of rainfall from 2000 – 2023 from West Java BMKG Station. Potential harvested volume of rainwater is 1230 – 2134 m3 with average supply 1603 m3 a year. The harvesting system design uses a 28 m3 FRP tank with dimensions 7 m x 2 m x 2 m. The gutter is installed with slope of ½% and the flat pipe with slope of 1%. Variations in pipe and gutter sizes used are between 1 – 10 inches. The cost required for PAH installation is IDR143,000,000.00. Actual water savings that can be achieved through PAH system are 44% – 75% of annual water needs and cost savings of more than 120% of the initial investment.
Keyword: air hujan, ketersediaan air, konservasi air, pemanenan air hujan, rainwater, rainwater harvesting, water availability, water 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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