Judul: Karakteristik Hidrolika Dam Parit untuk Ketersediaan Air Persemaian Permanen Dramaga
Abstrak: Sebelum pembangunan dam parit, perlu adanya analisis karakteristik hidrolika, mengetahui debit yang tersedia pada parit dan diharapkan air yang tersedia pada parit dapat dimanfaatkan dalam pemenuhan irigasi Persemaian Permanen Dramaga baik pada musim hujan maupun musim. Data hujan diolah untuk menentukan nilai curah hujan rencana dengan metode Weibull dan metode Gumbel. Hasil dari Cubic Spline Interpolation didapatkan karakteristik hidrolika yaitu luas penampang basah 16,83 m2, keliling basah 12,05 m, jari-jari hidrolika 1,4 m, slope parit sebesar 0,0001, kekerasan manning 0,04, diperoleh rating curve Q = 0,1653 H2,8884 dan debit banjir rencana yaitu 5,38 m3/detik. Debit minimum yang cuaca cerah 0,04 l/detik. Debit maksimum pada saat hujan 5,03 l/detik. Dam parit direncanakan memiliki volume tampungan efektif sebesar 39,5 m3, luas 10,8 m2 pada elevasi 2,1 m. Kebutuhan air irigasi dengan Kc rata-rata 0,8 untuk mengairi lahan seluas 0,6 ha adalah 0,07 l/detik atau sekitar 6,2 m3/hari. Dengan volume efektif 39,5 m3 dan debit masukan 0,04 l/detik, mengalami defisit air sebesar 0,03 l/detik atau setara dengan 2,6 m3/hari. Dengan dibangunnya dam parit diharapkan akan menampung kelebihan air pada saat hujan agar terpenuhinya kebutuhan air tanaman saat musim kemarau., Before constructing a ditch dam, it is necessary to conduct an analysis of hydraulic characteristics, determine the available discharge in the ditch and it is hoped that the water available in the ditch can be used to fulfill the irrigation of the Dramaga Permanent Nursery in both the rainy and dry seasons. Rain data is processed to determine the value of the planned rainfall using the Weibull method and the Gumbel method. The results of Cubic Spline Interpolation are obtained hydraulic characteristics, namely wet cross-sectional area of 16.83 m2, wet cross-sectional area 12.05 m, hydraulic radius 1.4 m, trench slope 0.00038, manning hardness 0.04, obtained rating curve Q = 0.1653 H2.8884 and the design flood discharge is 5.38 m3/s. The minimum discharge in sunny weather is 0.04 l/s. The maximum discharge when it rains is 5.03 l/s. The trench dam is planned to have an effective storage volume of 39.5 m3, an area of 10.8 m2 at an elevation of 2.1 m. The need for irrigation water with an average Kc of 0.8 to irrigate an area of 0.6 ha is 0.07 l/s or about 6.2 m3/day. With an effective volume of 39.5 m3 and an input discharge of 0.04 l/second, it has a water deficit of 0.03 l/s or equivalent to 2.6 m3/day. With the construction of the trench dam, it is hoped that it will be able to accommodate excess water when it rains so that the plant's water needs are met during the dry season.
Keyword: Hydraulics, nurseries, trench dam, water availability

Judul: Perancangan Penggunaan Air Sungai Ciapus untuk Menyuplai Air Irigasi di Persemaian Permanen Dramaga Bogor
Abstrak: Air dan sistem penyiraman sangat berdampak dalam produksi bibit berkualitas di persemaian permanen. Persemaian Permanen Dramaga menggunakan dua sumur resapan yang diisi oleh air hujan, saat musim kemarau terjadi kekurangan air. Air sungai Ciapus dapat dimanfaatkan dengan menggunakan pompa hidram. Oleh karena itu, perlu dirancang bak penampung yang dapat menyimpan sementara air dari pompa dan menyuplai air secara kontinu. Penelitian ini bertujuan menentukan kebutuhan air irigasi, serta menentukan kapasitas dan menghasilkan rancangan bak penampung air di lokasi penelitian. Kebutuhan air diperoleh berdasarkan nilai defisit pada neraca air antara laju evapotranspirasi dengan laju curah hujan. Defisit air rata-rata pada periode kemarau tahun 2015 merupakan nilai yang tertinggi selama tahun 2003-2020, yakni sebesar 2,63 mm/hari. Berdasarkan nilai tersebut diperoleh kebutuhan air irigasi sebesar 15,78 m3/hari untuk lahan seluas 0,60 ha. Debit pemompaan berpotensi mengisi bak penampung selama waktu penyiraman. Kapasitas bak penampung didesain setengah dari kebutuhan air harian, yakni 7,89 m3, dan dibulatkan menjadi 8 m3. Bak penampung direncanakan menggunakan bahan panel fiberglass. Ukuran panjang, lebar dan tinggi bak penampung masing-masing sebesar 2 m., Water and irrigation systems have a major impact on the production of quality seedlings in permanent nurseries. The Dramaga Permanent Nursery uses two infiltration wells filled by rainwater, during dry season there is a shortage of water. Ciapus river water can be utilized by using a hydraulic ram pump. Therefore, it is necessary to design a reservoir to temporarily store water from the pump and to supply water continuously. The research aimed to determine the need for irrigation water, determine the capacity and produce a water reservoir design at the research site.Water requirement was obtained based on the deficit value in the water balance between evapotranspiration rate and rainfall rate. The average water deficit in the dry season in 2015 was the highest value during 2003-2020, which was 2,63 mm/day. Based on this value, the irrigation water requirement was 15,78 m3/day for an area of 0,60 ha. The pumping discharge had the potential to fill the reservoir during watering time. The designed reservoir capacity was half of the daily water requirement, which was 7,89 m3, and fulfilled to 8 m3. The reservoir was planned to use fiberglass panel material. The length, width, and height of the reservoir were 2 m each.
Keyword: evapotranspiration, fiberglass reservoir, irrigation, rainfall

Judul: Elektrode Komposit Zeolit sebagai Biosensor Berbasis Tirosinase
Abstrak: Tyrosinase is a copper-containing oxidase, which catalyzes the first 2 steps in mammalian melanogenesis and responsible for enzymatic browning reactions. This study aims to develop and characterize tyrosinase biosensor of zeolite composite and its stability. The enzyme should be properly attached to the transducer for maintaining enzyme activity. Tyrosinase activity was monitored by L-DOPA as a substrate. The optimum conditions of tyrosinase activity obtained by respon optimizer were tyrosinase 50 U/mL and zeolite 150 mg/mL. Using of ferrocene as mediator and zeolite as the immobilization matrix on electrode increased the activity of tyrosinase. KMapp and Imaks app values of tyrosinase were determined by Lineweaver-Burk method, giving 6.04 mM and 6.42 mM, respectively. The electrode of zeolite as immobilizing matrix was relatively stable until 2 hours, the remaining tyrosinase activity was 87.45%
Keyword: tyrosinase inhibitor, tyrosinase-based electrode, biosensor