Judul: Pengaruh Penambahan Cahaya Kontinu Terhadap Produktivitas Tanaman Karet Rakyat (Hevea Brasiliensis Muell Arg.) Di Tanjung Jabung Barat, Provinsi Jambi.
Abstrak: This research is to know the relations of continous light to rubber plants’ productivity, located in West Tanjung Jabung, Jambi. This is an uncontrolled research with research spots taken at 225 m, 275 m, 325 m, 375 m, 425 m, 475 m, 525 m, 600 m, 700 m, and 800 m distances from flare. There are four rubber plants taken on each spots and flare is the light source researched. The variables observed on this research are rubbers production, light (illuminations, irradiations, UV, and quantum) splitted to day observation to the sunlight and night observation to the flare light. Other observation done on this research are weeds’ vegetation analysis, soil and air temperature observation, and soil analysis. Results on this research is the increase of contionus flare has no impact to the rubber plants productivity, because the observe value on the night observations show that illumination value is about 0,001-0,004 watt/m2, but the value of UV, irradiations and quantum shows zero point. Productivity of rubber plant is affected by the age of the plant and klon used as a seed, no treatment, no weeds’ control, and soil structure.The most influential factors in the production rubber clones GT and AVROS is the nutrient content of the soil, soil texture, soil pH, the amount of weeds, and the growth of rubber trees. In clone LCB factors affecting production are soil nutrient content, soil texture, soil pH, the amount of weeds, and the growth of rubber trees.
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Judul: Pertumbuhan Jabon Merah dan Pengaruh Intensitas Cahaya Terhadap Pertumbuhannya (Studi Kasus di Petak Penelitian TPTR di PT Intracawood Manufacturing).
Abstrak: Sistem Tebang Pilih Tanam Rumpang (TPTR) adalah salah satu sistem silvikultur yang dapat digunakan untuk meningkatkan produksi karena sistem ini menggunakan kelompok jenis kayu lokal yang cepat pertumbuhannya. Tujuan dari penelitian ini adalah menganalisis pertumbuhan tinggi dan diameter jabon merah serta pengaruh intensitas cahaya terhadap pertumbuhannya. Metode yang dipakai berupa pengumpulan data tinggi, diameter pohon dan intensitas cahaya serta data yang berasal dari dokumen PT Intracawood Manufacturing. Hasil penelitian ini menunjukan pertumbuhan tinggi dan diameter jabon merah memiliki pertumbuhan yang cukup signifikan. Uji bedanyata tukey menunjukan tidak ada perbedaan intensitas cahaya di rumpang dan hutan alam, dan uji korelasi menunjukan tidak ada pengaruh intensitas cahaya terhadap pertumbuhan tinggi dan diameter pohon jabon merah.
Keyword: Jabon merah, pertumbuhan, rumpang, TPTR

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