Judul: Modeling of flood and drought prediction (case study in  Separi watershed, Kutai Kartanegara, East Kalimantan)
Abstrak: A huge disater might be happened as a result of land use change especially forest that has good cover then was barely opened to rain drop impact as a result of trees cutting. Two negatives impacts that usually happened are flood in the rainy season and drought in the dry season.
Keyword: drought in the dry season, land use composition, watershed Separi management, loamy soil, sandy and clay dominant soil

Judul: Optimasi penggunaan lahan dengan menggunakan model simulasi hidrologi daerah aliran sungai studi kasus di Sub DAS Ciliwung Hulu, Jawa Barat
Abstrak: The flood and drought that almost every year hit in Jakarta is related to the condition of Upper Ciliwung Sub Watershed as a recharge and protection area of Ciliwung Watershed. The high growth of population in the watershed caused increasing land needs and eventually decreasing forested land that supporting the function of recharge and protection of Upper Ciliwung Sub Watershed. Modelling is a way to find alternative measures for solving flood and drought problem in Jakarta. By using a model, behavior of river as the result of land uses changes can be observed without implemented in field, hence it save time and cost. Complicated and interrelated hydrologic processes as well as rapid land uses change requires a model to accomodate those factors with adequate accuracy. Beside using already available models, hidrologic parameter estimation in Upper Ciliwung Sub Watershed has also been done by using self-made model by using model builder software. Rozi (2002) has made a model by using STELLA. In his model, Rozi used monthly time unit that the model can’t be used to observe average daily debit that have potential contribution in causing flood in Jakarta.
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Judul: Extraction and Characteristic of Collagen and Nanoparticle Collagen from the Skin of Stingray Fish (Pastinachus solocirostris) as Ingredient of Cosmetics.
Abstrak: Isolation of collagen from the skin of stingray fish (Pastinachus solocirostris) has been successfully conducted with three stages: first soaked in 0.05 M NaOH with a sample/solution ratio of 1:10 (w/v) for 6 hour, second soaked in 0.1 M acetic acid with a sample/solution ratio of 1:6 (w/v) for 2 hour, and third extraction with destilated water at temperature 40 C for 2 hour with a yield of 14.475 % (wet base). Nanoparticle collagen was made with desolvation method using etanol as a desolvating agent with a collagen solution/etanol ratio of 1:1. Yield of nanoparticle collagen was 9.64% (wet base) with particle size of 185.24 nm. Collagen and nanoparticle collagen is in the form of white powder with whiteness degree 72.48% and 60.03%, respectively. Protein is the major component in collagen and nanoparticle collagen (86.97% and 86.18%) with trace amount of ash (0.17% and 0.13%) and fat (0.19% and 0.25%), respectively. Based on sodium dodecyl sulfate-polyacrylamide gel electrophoresis patterns, amino acid composition, and fourier transform infrared (FTIR) spectra of both collagen and nanoparticle collagen were characterized as type I collagens. Nanostructural analysis of collagen and nanoparticle collagen by Scanning Electron Microscopy (SEM) shows that both were separate aggregates. Other characteristics of collagen and nanoparticle collagen were: Tmax of 165.88 C and 156.63 C; Viscosity 292.33 cP dan 110 cP; pH 5.00 dan 4.93; respectively. Collagen has highest solubility at pH 7 and the isoelectric point at pH 6, 9, and 10. Therefore, nanoparticle collagen has highest solubility at pH 3 dan and the isoelectric point at pH 6. Collagen and nanoparticle collagen from skin of stingray fish (Pastinachus solocirostris) has a characteristic for a potential use as a cosmetic ingredient.
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