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: Prediksi Potensi Cadangan Airtanah Menggunakan Persamaan Darcy di Kota Tangerang Selatan, Provinsi Banten
Abstrak: Water is very important for human beings. Sources of freshwater that can be used is only 3% of the total water availability on earth. One of fresh water’s sources that can be used is groundwater. The objective of this study was to determine the capacity of groundwater storages (discharge) in aquifers at South Tangerang city using the Darcy equation. The method of research was include several stages, such as the preparation phase, data collection, data processing, data analysis, and presentation of results. Data were obtained from geoelectric measurements using Schlumberger software, and were used to analyse the type and depth of rock layers. Beside, the data were also used to determined the position of confined and unconfined aquifer. The flownet of confined and unconfined aquifer indicated the scheme of groundwater’s flow and was used to decide the cross section of the flow. Darcy equation required another parameter called hydraulic conductivity. In this research, the aquifer was dominated by sand, so the hydraulic conductivity for sand (12 m/day) was used in calculation. As the result groundwater storages on unconfined aquifer was 3551,50 m3/day, while on confined aquifer was 16864.11 m3/day.
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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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