Judul: Mutu tepung jambu biji instan hasil pengeringan kabut dari berbagai suhu proses
Abstrak: Guava (Psidium guajava, L.) is one of fruits that provide economic value in Indonesia. When further processed to prolong its shelf life, guava will gain higher value added. One of the alternatives to preserve guava is by spray drying to produce instant guava powder. The objectives of this study were 1) to determine the spray drying temperature of guava, and 2) to assess the physical, chemical, and organoleptic characteristics of instant guava powder in various drying temperatures. Four levels of spray drying temperature were applied with three repetitions. The results indicated that the recommended conditions for spray drying process were 20% maltodextrin as filler and 160o C drying temperature that produced instant guava powder with 7.47% yield, 10.94% moisture content dry basis or equivalent with 9.86% moisture content wet basis, the best third lightness, the best of spreading powder, 95.55% of dissolving in water, 403.33 kg/m3 of bulk density, 7.06 x 10-4 kg/minute of rehydration rate, 568.7 g/100 mg solid of vitamin C content, and the best organoleptic. Drying temperature did not influence the yield and moisture content of product. However, it influenced significantly the colour, bulk density, rehydration rate, flavor, color, and total organoleptic score of the guava drink made from the instant guava powder.
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Judul: Mempelajari Cara Pembuatan Minuman Bubuk Jambu Biji (Psidium guajava L)
Abstrak: Penelitian cara pembuatan minuman bubuk jambu biji (Psidium guajava L.) dengan menggunakan alat pengeringan semprot (spray drier) ini dilakukan untuk mengolah lebih lanjut buah jambu biji yang banyak dihasilkan di Indonesia. Disamping itu juga untuk memudahkan distribusi dan nilai guna dari buah jambu biji,khususnya jambu biji jenis susu.
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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