Judul: Prediksi Intrusi Air Laut berdasarkan Nilai Daya Hantar Listrik dan Total Dissolved Solid di Kabupaten Tangerang
Abstrak: Intrusion of sea water is the infiltration of sea water into the soil. This might be caused by a groundwater excessive exploration. Tangerang District is one of the areas that have great potential sea water intrusion. The aim of research was to predict the limit of salt water intrusion based on the value of DHL and TDS. The primary data were measured using a TOA EC meter CM-14P and then were processed using Surfer 9.0 software and ArcGIS. The measurement results was compared with PAHIAA Decision (1986) and Carroll’s Classification (1962). The results showed that the intrusion area could be identified by DHL and TDS values. On the area located far from the beach, intrusion was influenced by the presence of a river in the region. This was indicated by the regression analysis that showed a correlation between distance and value DHL/TDS with a negative slope value. Based on DHL and TDS parameters in observation area, the groundwater conditions in Tangerang District within a radius of 0.095 km to 5 km from the littoral areas were categorized as medium intrusion zone (slightly brackish water) with DHL 1500-1999 μmhos/cm and TDS values 1000-3000 mg/L.
Keyword: DHL, groundwater, linear regression analysis, sea water intrusion, TDS

Judul: Sebaran TDS, DHL, Penurunan Muka Airtanah dan Prediksi Intrusi Air Laut di Kota Tangerang Selatan
Abstrak: The overuse of groundwater with the management of water sources that ignores the environment can decrease the quantity and quality of groundwater. In the area of South Tangerang City, groundwater quality degradation is caused by the dynamics of development South Tangerang City towards the profile of Metropolitan City. The purpose of this research is to make the water quality zone map based on DHL and TDS parameter, zone map based on decrease of groundwater level and predict the occurrence of seawater intrusion in the South Tangerang City. The research method used is to identify the quality groundwater and a decrease of groundwater level from water analysis using Kepmen ESDM Nomor 1451.K/10/MEM/2000 and make the distribution of water quality and a decrease of groundwater level using the software Surfer 9 and ArcView GIS 3.2, and predict patterns spread of seawater intrusion from water quality analysis using the regression equation. From the identification result and analysis of water quality, South Tangerang City is categorized as a safe zone. Safe zone is the area that meets one of decrease criteria on groundwater quality which are characterized by the increase of TDS that is less than 1,000 mg/l or less than 1,000 DHL μmhos/cm.
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Judul: Kawin Berulang Pada sapi, Kausa Kuman Aspesifik Dan Pengobatannya
Abstrak: Kawin berulang pada sapi betina adalah merupakan bantuk atau geja1a inferti1itas, dimana sapi-sapi yang menderita kawin beru1ang tersebut mempunyai siklus berahi yang normal atau hampir normal dan sudah dikawinkan dua ka1i atau 1ebih dengan pejantan atau semen pejantan fertil, tapi tetap belum bisa bunting. Pemeriksaan klinis terhadap sapi tersebut tidak memberikan gambaran tertentu yang dapat menerangkan kegaga1an konsepsi yang dialami (Roberts, 1971).
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