Judul: The using of direct current air pump and solar energy sources on the cultivation of vaname postlarvae Litopenaeus vannamei
Abstrak: Pengembangan usaha budidaya perikanan khususnya di daerah terpencil menghadapi tantangan keterbatasan energi listrik, yang kemudian harus menggunakan listrik alternatif, antara lain dengan listrik energi surya. Sumber listrik tersebut dapat digunakan pada pompa DC dalam sebuah hatchery udang vaname untuk menghasilkan oksigen yang layak untuk udang tumbuh dan berkembang. Penelitian ini bertujuan untuk mengukur seberapa besar kinerja pompa DC menggunakan bantuan sumber energi surya (SES) dan membandingkan penggunaan pompa DC dengan sumber energi PLN (SEP) yang dilihat dari segi kestabilan daya listrik (P), dissolved oxygen (DO), oxygen transfer rate (OTR), efektivitas pompa DC (E), kelangsungan hidup (SR), serta laju pertumbuhan spesifik (SGR). Penelitian ini dilaksanakan dari tanggal 09 November s.d. 28 November 2011, bertempat di Laboratorium Lingkungan 2, Fakultas Perikanan dan Ilmu kelautan, Institut Pertanian Bogor. Metode yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan perlakuan penggunaan pompa DC dengan sumber energi surya (SES) dan penggunaan pompa DC dengan sumber energi PLN (SEP). Masing-masing pompa DC dilengkapi selang aerasi sebanyak 10 selang pada wadah dengan volume 400 liter dan dialiri listrik dengan tegangan 12 Volt. Hasil penelitian menunjukkan nilai DO pada perlakuan dengan listrik tenaga surya yaitu berkisar 1,6-11,8 mg/l, sedangkan pada PLN berkisar 5,0-11,7 mg/l. Pengukuran nilai OTR dan efektivitas pompa DC tertinggi pada perlakuan tenaga surya yaitu 1,65 x 103 kg O2/jam dan 6,1 %. Penggunaan pompa DC dengan sistem tenaga surya dan PLN tidak berpengaruh secara signifikan terhadap tingkat kelangsungan hidup dan laju pertumbuhan spesifik postlarva udang vaname Litopenaeus vannamei
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Judul: Pengadaan Dissolved Oxygen dari High-Blow dengan Sumber Energi Surya dalam Pemeliharaan Juvenil Udang Vaname Litopenaeus vannamei
Abstrak: The critical energy of PLN in supplying the electrical energy, influence the high-blow ability in work to supply the dissolved oxygen. So it’s important to search for other sources of electrical energy which are low cash, stable, regenerable and always available to supply the electrical energy to the high-blow. This research aims to compare the provision of aeration produced by high-blow between solar energy sources and PLN energy sources in the white shrimp Litopenaeus vannamei juvenile rearing. It was termed by stability of electric power (P), dissolved oxygen (DO), oxygen transfer rate (OTR), the effectiveness of high-blow (E), the survival rate (SR), as well as the specific growth rate (SGR). Treatment was applied, by using of a high-blow (for 2 fiber tub) with solar energy sources (SES) and the use of a high-blow (for 2 fiber tub) with PLN energy sources (SEP). Based on observations, it was known that P in the treatment of SEP was relatively more stable around 129.09-149.85 watt while P in the treatment of SEP was ranged from 80.80-174.80 watt. P in the treatment of SEP had 0 watt (power off). DO in the treatment of SES ranges from 7 s.d.8 mg/Liter, while the DO in the treatment of SEP ranged up to 6.8 8 mg/liter. OTR in the treatment of SES was 9.6 x 10-4 kg O2/jam, whereas the treatment of SEP OTR was 8.7 x 10-4 kg O2/jam. The E of the treatment of SES was 60.6%, while the E treatment of SEP was 57.3%. SR in the treatment of SES was 90%, while the SR in the treatment of SEP was 96%. SGR on SES treatment of 18.69%, while the SGR in the treatment of SEP was 19.49%. White shrimp juvenile rearing using aeration of different energy sources did not provide a significant influence on the survival rate (SR) and growth (SGR) of white shrimp juvenile indicated by the SR ranged around 90% and 18.5% of SGR. Thus the energy source of solar power could be an alternative source of electrical energy for the seeding of white shrimp.
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Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology