Protection of ground water for present and future use requires monitoring and understanding of the mechanisms controlling long-term quality of ground water. In this study, spatial and temporal trends in concentrations of nitrate and pesticides in ground water in the eastern San Joaquin Valley, California, were evaluated to determine the long-term effects of agricultural and urban development on...

Transmissivity is an important hydraulic parameter to determine the amount of water passed horizontally across a given saturated thickness of an aquifer. The techniques to quantify this parameter, such as grain size analyses or pumping tests, can have limitations of time/spatial scale, viability, or economically. One technique that can be used, but little adopted, is the capture zone analysis. ...

[1] The Martian outflow channels were carved by the eruption of catastrophic floods from groundwater aquifers. This study models the time evolution of a typical outflow channel flood originating within a chaos region. The flood initiates when superlithostatic pore pressures within a confined aquifer lead to the propagation of hydrofractures through the confining cryosphere to the surface. The p...

A shallow aquifer with different redox zones overlain by intensive agricultural activity was monitored for the occurrence of 1,2-dichloropropane (DCP) to assess the fate and origin of this pollutant. DCP was detected more frequently in groundwater samples collected in aerobic and nitrate-reducing zones than those collected from iron-reducing zones. Simulated DCP concentrations for groundwater e...

1. Tabular data are the earliest form and remain a staple of official statistics data products. Familiar examples of tabular data products in official statistics include count data such as age-race-sex and other demographic data, concentration (or percentage) data such in financial or energy utilization statistics, and magnitude data such as total retail sales or air pollution data. Confidentia...

Information is often represented in tabular format in everyday documents such as balance sheets, sales figures, and so on. Tables represent an interesting point in the spectrum of representation systems between pictures and sentences, since some aspect of tables are sentential or conventional in nature, while others are graphical. In this paper we describe the logic of a particular formalized t...

This paper describes an experiment we have made in order to illustrate a promising methodology. A first tabular parser, built from the syntactic skeleton of a unification grammar, parses a sentence and produces a shared forest. This forest is used to guide and speed-up a second tabular parser which performs the unification checks.

Table structure identification has received significant research attention in the past few years. The OCR (Optical Character Recognition) has faced many potential errors in the document images, so it is strongly required to make logical objects such as table explicit. So to get the deep understanding about the contents of the document, proper understanding of the document is required by means o...

Effective management of nitrateimpacted aquifers requires identifying the sources of nitrate to the aquifer, and understanding the transport and fate of nitrate within the aquifer. Source identification is crucial to effective source mitigation; conversion of residential septic systems to sewer in a rural community will be ineffective if the primary source of nitrate contamination is agricultur...