Judul: Desain Bangunan Spillway dan Bangunan Intake Situ Gede, Kota Bogor.
Abstrak: Bangunan pelimpah (spillway) adalah bangunan pelengkap suatu situ yang berfungsi untuk mengalirkan kelebihan air agar tidak membahayakan tubuh situ. Bangunan intake adalah suatu unit untuk mengambil air baku dari badan air sesuai dengan debit yang diperlukan. Tujuan penelitian ini adalah menganalisis debit andalan dan debit banjir, membuat kurva lengkung kapasitas, merancang dimensi bangunan intake dan spillway. Debit andalan dihitung dengan menggunakan metode Mock dan debit banjir menggunakan metode Rasional. Debit andalan yang didapat sebesar 1.66 l/det, dan debit banjir sebesar 32.3 m3/det yang dibagi ke dalam 5 daerah tangkapan air. Dari kurva lengkung didapat volume hidup situ sebesar 2662.84 m3 pada elevasi +174.05 m. Pada perancangan dipilih bangunan intake bertipe pipa distribusi (pipa intake) dengan dimensi panjang 128 m, dan beda ketinggian hulu-hilir sebesar 0.2 m serta terletak 1.25 m di bawah muka air situ maksimum. Bangunan intake dapat mengalirkan debit sebesar 0.0098 m3/det. Bangunan spillway dirancang dengan mempertimbangkan aspek estetika untuk memikat para wisatawan sehingga dipilih bangunan spillway tipe ogee. Bangunan spillway memiliki kedalaman dasar 1.5 m, panjang bentang 22 m membentuk setengah lingkaran, lebar 3 m, dan peredam energi sepanjang 2 m. Bangunan spillway dirancang untuk mengalirkan debit sebesar 11 m3/det.
Keyword: debit andalan, debit banjir, kurva lengkung kapasitas, tipe ogee

Judul: Kaji Ulang Bangunan Spillway pada Proyek Bendungan Ciawi - Cipayung, Kabupaten Bogor.
Abstrak: Pengendalian banjir pada Bendungan Ciawi - Cipayung dilakukan dengan pengoperasian bangunan bottom outlet dan bangunan pelimpah. Penelitian ini bertujuan untuk melakukan kaji ulang bangunan Spillway (pelimpah) pada proyek Bendungan Ciawi - Cipayung, Kabupaten Bogor berdasarkan hasil analisis dari kondisi bangunan pelimpah dan bangunan bottom outlet, koefisien limpasan, waktu konsentrasi, intensitas curah hujan, debit rencana bangunan pelimpah, debit rencana bangunan bottom outlet, kedalaman aliran kritis dan pengaturan debit outflow. Hasil analisis koefisien limpasan (c) sebesar 0.32 dengan waktu konsentrasi (tc) sebesar 1.91 jam, sehingga intensitas curah hujan untuk periode ulang 25 tahun sebesar 51.56 mm/jam dan periode ulang 1000 tahun sebesar 86.42 mm/jam. Debit rencana bangunan bottom outlet dan bangunan pelimpah dihitung dengan menggunakan metode Nakayasu, yaitu sebesar 387.4 m3/det dan 670.8 m3/det. Kedalaman aliran kritis (hc) pada bangunan pelimpah dalam kondisi debit rencana sedalam 2.28 m, sedangkan dalam kondisi debit sungai maksimum sedalam 3.87 m. Pengaturan debit outflow dalam kondisi normal adalah sebesar 316.3 m3/det sesuai dengan kapasitas bangunan bottom outlet.
Keyword: bangunan bottom outlet, bangunan pelimpah, debit outflow, debit rencana, kedalaman aliran kritis

Judul: Pengaruh Jumlah Bahan Pretanning dan Minyak Biji Karet (Hevea brasiliensis) Terhadap Mutu Kulit Samoa. Di
Abstrak: Animal hides or skins are the most valuable by product of the meat industry. Most of those hides are converted into leather by leather tanning process. Chrome based tanning is the most popular tanning process. At the chrome based tanning process, a lot of amount chrome are throw away into the environment that make a significant effect to the biological and ecological environment damaged. Due to concerns over the use and disposal of chromed tanned leather, the leather industry is now facing increasing scrutiny over its use of chrome as tanning agent. The use of non-chrome tannages has gradually become pre-eminent to producing leather, particularly in the European automotive leather markets. Chamois leather is one of leather product. It is produced from animal hides/skins by oil tanning process, usually with fish oil. High price and odour problems to the chamois leather that produced using fish oil motivate to do some research to solve that problems. Rubber seed oil is an oil that predicted can substitute fish oil. Pretanning process is needed to increase the oil penetration and protects the pelt from putrefying during oxidation periods (Khrisnan et al., 2005). Relugan GT 50 is the agent that used on this research. Relugan GT 50 is an aldehyde tanning agent, produced by BASF. This research was aimed to find out the effects of Relugan GT 50 concentration (offer) and rubber seeds (Hevea brasiliensis) oil to the chamois leather’s quality. Beside that, this research is also aimed to decide the best combination of the factors to produce chamois leather also to know the chamois leather characteristics. The preliminary research was carried out by analyzing the rubber seed’s kernel and eggshell as well as physico-chemical properties of the rubber seed oil. The main research was done by tanning the skin with Relugan GT 50 in concentrations of 1.5, 3.0 and 4.5% followed by rubber seed oil concentrations of 10, 20, and 30%. The experimental design used was completely randomize factorial design. The preliminary research shows that rubber seed’s kernel was 49% and rubber seed’s eggshell was 51%. The rubber seed’s oil characterstics were density of 0.94 (g/cm3), viscosity of 48,4 centistokes, colour of 2713 PtCo units, inodine value 113 g iod/ 100 g, peroxide value of 24 miliequivalent/1000 gram oil, acid value of 15 mg KOH/g oil and FFA content of 5.8%. The research shows that Relugan GT 50 concentration significantly affected shrinkage temperature (Ts) and pH; rubber seed oil concentration significantly affect the organoleptic properties of the leather. The optimum conditions for the tanning were Relugan GT of 3.0% concentration and 10% rubber seeds oil. The physical properties of the leather were shrinkage temperature of 75oC, thickness of 0.92 mm, tensile strength of 21.50 N/mm2, elongation at break of 144%, tear strength of 55.77 N/mm, water absorption of 266% (2 hours) and 299% (24 hours). The chemical properties were oil content of 2.5%, ash content of 1.2% and pH of 8. The organoleptic properties were softness of 7–8, colour of 8-9, and odour of 8-9.
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