Judul: Pengaruh Jenis Media Tanam terhadap Pertumbuhan Bibit Pepaya (Carica papaya L.) Genotipe IPB 3, IPB 4, dan IPB 9.
Abstrak: The research aims to study the influence of growing media types on seed germination and seedlings growth of papaya IPB 3, IPB 4 and IPB 9 genotypes and know growing medium suitable for growth of papaya seedlings is good and has a light weight to facilitate the transportation of seedlings. The research was conducted in March until September 2011 in the greenhouse FATETA IPB, Leuwikopo Bogor and The Experimental Garden of PKBT IPB, Tajur Bogor. The design used was Randomized Complete Design Group two factors. The first factor is the growing media with 5 kinds with the same ratio (2:1:1), namely M1 = soil: sand: manure, M2 = soil: sand: rice husk charcoal, M3 = soil: sand: cocopeat, M4 = soil: manure: cocopeat, and M5 = soil: manure: rice husk charcoal. The experiment consisted of 15 combinations with 3 replicates then there were 45 experimental units . The results showed that papaya seeds germinate is the highest of the growing media mix of soil, manure, and rice husk charcoal (M5) is 70% and IPB 3 genotype (G1) is 70.91%. The composition of media soil, manure, and rice husk charcoal (M5) with a ratio of 2:1:1 is the best medium for papaya seedlings at 6 MST and has a weight of seedlings per polybag is the lightest compared with other growing media to facilitate the transportation of seedlings.
Keyword: 

Judul: Pengaruh Komposisi Media Tanam Terhadap Bibit dan Pertumbuhan Awal Pepaya (Carica papaya L.) Tipe Bangkok dan California.
Abstrak: The objective of the research was to observed growing media with a light weight but still could support the seedling and initial growth of two types of papaya. The research was conducted at Cikabayan Experimental Field, Darmaga, Bogor, from May to October 2013. The experiments used two papaya types which were Bangkok and California and was arranged in Factorial Randomized Complete Block Design with one factor and three replications. The treatment was growing media composition which were a mix of soil, cattle manure, and rice husk charcoal with different ratio (ratio based on volume); M1 (2 :1:1) as a control, M2 (1:1:1), M3 (1:1:2), M4 (1:2:1), M5 (1:2:2), M6 (2:1:2), and M7 (2:2:1). The result showed that the growing media affected the weight of seedling and diameter of stem by the polybag of both types in the seedling phase at 5 Weeks After Planting (WAP), and also affected the height of plant at 1 and 2 WAP of Bangkok type. Growing media thas has light weight and was able to support the seedling’s growth was media M3, M4, and M5 for both Bangkok and California types, while the most economical was media M3. The composition of soil in the growing media can be reduced to only 1/5 part from the total volume of the media without inhibit the growth of the seedling. Growing media composition did not affected the height, number of leaf, diameter of stem, time of first flowering and height of the first flower bud in both Bangkok and California types in the field.
Keyword: cattle manure, economical, lighter media, rice husk charcoal

Judul: Kruskal Coordinates in 4+1 Dimensional Schwarzschild  Spacetime Geometry
Abstrak: Koordinat Kruskal adalah hasil ekstensi maksimal dari koordinatSchwarzschild yang menimbulkan interpretasi baru tentang keberadaan wormhole. Secara teori, wormhole adalah struktur yang menghubungkan dua titik berbeda dalam ruangwaktu. Namun, ukuran wormhole terlalu kecil untuk dapat dilalui dan tidak stabil sehingga mudah runtuh. Penelitian ini bertujuan mendapatkan solusi koordinat Kruskal untuk geometri Scwarzschild pada dimensi yang lebih tinggi yang dapat berguna untuk menganalisis kestabilan wormhole. Penelitian ini dilakukan melalui penambahan dimensi ruang dari 3+1 dimensi menjadi 4+1 dimensi untuk mendapatkan geometri Schwarzschild, koordinat Eddington-Finkelstein, dan koordinat Kruskal dengan memanfaatkan gerak radial foton. Hasil akhirnya, solusi geometri ruangwaktu Schwarzschild dalam koordinat Kruskal dapat dibentuk dan diilustrasikan dalam diagram Kruskal. Diagram tersebut menunjukan sebuah black hole, white hole, dan dua alam semesta yang dihubungkan oleh wormhole., The Kruskal coordinates are the maximal extension of the Schwarzschild coordinates which give rise to new interpretations of the existence of wormholes. In theory, a wormhole is a structure that connects two different points in spacetime. However, the size of the wormhole is too small to pass through and is unstable so that it collapses easily. This study aims to obtain Kruskal coordinate solutions for the Scwarzschild geometry in higher dimensions which can be useful for analyzing wormhole stability. This research was carried out by adding space from 3+1 dimensions to 4+1 dimensions to obtain Schwarzschild geometry, Eddington Finkelstein coordinates, and Kruskal coordinates by utilizing the radial motion of photons. The final result, the solution of the Schwarzschild spacetime geometry in Kruskal coordinates can be formed and illustrated in a Kruskal diagram. The diagram shows a black hole, a white hole, and the two universes connected by a wormhole.
Keyword: Schwarzschild geometry, Eddington-Finkelstein coordinates, Kruskal coordinates, radial motion of photons, wormhole