Judul: Efektivitas Emulsifiable Concentrate (EC) Berbasis Ekstrak Daun Mindi (Melia azedarach L.) Dalam Mengurangi Kerusakan Beras Akibat Serangan Sitophilus zeamais Motsch Selama Penyimpanan
Abstrak: Rice is the staple food in Indonesia. It needs to be preserved with a good post-harvest handling. Storage is one of the most important stage. At this stage there are often changes in the quality and quantity of stored materials that are influenced by various factors such as storage facilities and warehouse pests. Sitophilus zeamais is a major pest during storage of food grains such rice and maize. Insect control is mostly done by using synthetic insecticides. However, the use of synthetic insecticides should consider their danger due to the fact that they are poisonous to man and domestic animals. One effort to find a replacement for synthetic insecticides are insecticides derived from plants. Mindi (Melia azedarach L.) is a type of tree that grows in tropical and sub-tropical areas and is known as source of plant pesticide. The objectives of this research are to determine the effectiveness of insecticide formulations in the form of Emulsifiable Concentrate (EC) to be applied to the storage of rice and to study the damage of rice during storage due to Sitophilus zeamais infestation. This research consists of two main steps, i.e. preparation stage and insecticide test stage. Parameters observed during storage are number of insect populations (Nt), percent of the holed seeds (%BB), percent weight loss (%KB), % frass, water content and free fatty acid content. Mortality test showed that at concentration of 0 % causing 14 % of insect mortality. It means that in the absence of active ingredient, solvent and emulsifier influence the development of insects. Result of the insecticide test showed that the concentration variation of Melia azedarach L. leaves extract significantly affect (p<0.05) the parameters of rice damage. It was concluded that the most effective concentration of the extact to reduce rice damage is 16 %.
Keyword: 

Judul: Ekstrak biji mimba (Azadirachta indica A. Juss) dan mindi (Melia azedarach Linn.) serta efikasinya terhadap rayap kayu kering Cryptotermes cynocephalus Light.
Abstrak: Kekhawatiran akan dampak yang ditimbulkan oleh pestisida sintesis telah mendorong manusia mencari pestisida substitusi yang lebih bersahabat dengan manusia dan lingkungannya. Salah satu kebijaksanaan yang dapat ditempuh dalam rangka mensubstitusi pestisida yang berbahaya itu adalah dengan memanfaatkan kembali pestisida alami bagi kepentingan pem- bangunan nasional, khususnya sektor pertanian dan kehutanan. Dua jenis tanaman yang dilaporkan mengandung pestisida alami adalah mimba (Azadirachta indica A. Juss) dan Mindi (Melia Azedarach Linn.). Biji mimba dilaporkan mengandung senyawa yang bersifat biopestisida yaitu azadirachtin, meli- antriol dan salanin (Jacobson, 1980), sementara itu tanaman mindi mengandung senyawa orchinolit A, nibolindin B dan bahan amorf (Kraus et al, 1980). Senyawa tersebut mengandung bahan yang dapat menghambat atau mengurangi selera makan (antifeedant) pada serangga atau zat penolak (repellent), sehingga bahan tersebut efektif untuk mengendalikan berbagai jenis hama (Saxena, et al 1980). Suatu penelitian telah dilakukan untuk mengetahui kemung- kinan ekstraksi biji mimba dan mindi serta efikasinya terha- dap rayap kayu kering C. cynocephalus. Ekstraksi dilakukan masing-masing terhadap 1000 gr serbuk biji mimba dan mindi berukuran 40-60 mesh dengan menggunakan pelarut etanol 95% (perbandingan 2 : 3), selama 48 jam. Ekstrak etanol yang diperoleh dievaporasi dengan rotary vaccum evaporator pada suhu 40°C dan kecepatan putaran 30 40 rpm...dst
Keyword: 

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