Judul: Keanekaragaman dan pola adaptasi ikan di daerah hulu sungai Ciliwung, Jawa Barat
Abstrak: Daerah Aliran Sungai hulu Ciliwung bermula dari gunung Telaga Mandalawangi, dan meliputi kecamatan Cisarua, Ciawi, dan Kedunghalang. KEstabilan ekosistem hulu sungai dapat dikaji dari informasi tentang tingkat keanekaragaman ikan-ikan yang hidup pada habitat hulu tersebut.
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Judul: Keanekaragaman, Kelimpahan dan Distribusi Ikan di Waduk Cirata, Jawa Barat
Abstrak: Fish occupy various forms of aquatic ecosystems such as marine, brackish and freshwater. Around 43% from the total number of all fish species, occupying freshwater. Reservoir construction cause alteration of topography and hydrology of natural aquatic. Topographical altaration of relate to the diversity of species. Cirata Reservoir is the main reservoirs in Indonesia, formed from the damming of the Citarum River. The number of indigenous fish species in the Citarum river before damming more than 20 species. The study found 16 fish species, with nine indigenous species, are; Barbonymus balleroides, Rasbora argyrotaenia, Osteochilus vittatus, Mystacoleucus marginatus, Hampala macrolepidota, Hemibagrus nemurus, Mystus nigriceps, Oxyleotris marmorata, Parambasis siamensis, as well as seven non-indigenous species are; Cyprinus carpio, Oreochromis niloticus, Hemichromis elongatus, Amphilopus citrinellus, Chanos chanos, Colossoma macropomum, Hypostomus plecostomus. The indigenous fish species that not found in the previous study is Barbonymus gonionotus, Puntius binotatus, and Chana striata. The reduced number of individuals and species of indigenous fish species associated with be lost of food sources, cause altaration of habitat. Although, competition with the non-indigenous species benefit the same food. Highest number of individuals and species found in location 3, whereas the lowest number of individuals at location 4 and the number of species at location 5. O. niloticus has the highest relative abundance and distribution. Value of environmental factors still suitable for the fish life.
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Judul: Sintesis BaTiO3 dari Campuran Ba(OH)2 dan TiO2 dengan Tambahan PbO
Abstrak: Piezoelectric material can generate electric field in response to applied mechanical stress. Conversely, they can stretch and contract in response to an electric field. This material can be used for many applications such as transducer, microphone, ultrasound, and pressure gauge. Barium titanate is a ferroelectric material with piezoelectric properties that can be synthesized easily. The aim of this study is to synthesis barium titanate from mixture of Ba(OH)2 and TiO2, also observe its optimum temperature and the effect of PbO addition. The method of synthesis was solid-state reaction and sol-gel method, then the products were characterized with x-ray diffraction (XRD). Based on XRD analysis, the optimum temperature for both methods was 800°C. Addition of PbO to BaTiO3 in the solid-state reaction formed a compound with formula of Ba1-xPbxTiO3. The addition has changed diffraction pattern peak at 2θ and strengthened its tetragonal structure. The best result was obtained at x of 0.5 which will form a compound of Ba0.5Pb0.5TiO3.
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