The present situation of researches on full text databases and their retrieval method in China since 1990s are described.To have a better understanding of the development process of full text databases and their retri...The present situation of researches on full text databases and their retrieval method in China since 1990s are described.To have a better understanding of the development process of full text databases and their retrieval method,the focus and trend of the researches are discussed so as to provide references for their future development.展开更多
The paper starts with an introduction to the development process of database technologies.Then,it discusses the techniques and methods used to develop multimedia database.Finally,taking the Information Management Syst...The paper starts with an introduction to the development process of database technologies.Then,it discusses the techniques and methods used to develop multimedia database.Finally,taking the Information Management System of Graduate Students as an example,it describes the design process of a simple multimedia database.展开更多
This paper presents a new risk assessment methodology for coal mine excavated slopes. This new empirical-statistical slope.stability assessment m. ethodology （SSAM! is intended for use by geotechnical engineers at bo...This paper presents a new risk assessment methodology for coal mine excavated slopes. This new empirical-statistical slope.stability assessment m. ethodology （SSAM! is intended for use by geotechnical engineers at both the design review and operational stages of a mine＇s life to categonse the risk of an excavated coal mine slope. A likelihood of failure is determined using a new slope stability classification system for excavated coal mine slopes developed using a database of 119 intact and failed case studies sourced from open cut coal mines in Australia. Consequence of failure is based on slope height and stand-off distance at the toe of the excavated slope. Results are presented in a new risk matrix, with slope risk being divided into low, medium and high categories. The SSAM is put forward as a new risk assess- ment methodology to assess the potential for, and consequence of, excavated coal mine slope failure. Unlike existing classification systems, assumptions about the likely failure mode or mechanism are not required. Instead, the SSAM applies an approach which compares the conditions present within the exca- vated slope face, with the known past performance of slopes with similar geotechnical and geometrical conditions, to estimate the slope＇s propensity for failure. The SSAM is novel in that it considers the depo- sitional history of strata in an excavated slope and how this sequence affects slope stability. It is further novel in that it does not require explicit measurements of intact rock, rock mass and/or defect strength to rapidly calculate a slope＇s likelihood of failure and overall risk. Ratings can be determined entirely from visual observations of the excavated slope face. The new SSAM is designed to be used in conjunction with existing slope stability assessment tools.展开更多
Groundwater is an essential source of drinking water for many Indian urban habitats. Large numbers of people consume ground water instead of municipal tap water due to contamination of tap water. Groundwater is extrac...Groundwater is an essential source of drinking water for many Indian urban habitats. Large numbers of people consume ground water instead of municipal tap water due to contamination of tap water. Groundwater is extracted from thousands of bore wells, and used for potable purpose without proper testing and treatment. This paper describes a groundwater quality monitoring strategy and database model developed for Gulbarga city, located in Karnataka, India. Sampling wells are selected one each in 55 wards of the city corporation having easy access for regular sampling. Various attributes of sampling wells including their spatial coordinates, location address and a photograph are registered for ready recognition on site. Water samples are collected and analyzed for various physico-chemical parameters. Spatial coordinates and levels of sampling points are measured on site using a hand held GPS instrument. Gulbarga city map is digitized. A GIS database of the measured spatial and water quality data is developed using ArcGIS Desktop 9.3, and ground water quality maps are prepared which may serve as useful tools for developing policy, and regulatory mechanism for sustainable groundwater use.展开更多
The paper examined the state of GIS （geographic information systems） knowledge and adoption in Nigeria, identified factors affecting its implementation and finally discussed methods of enhancing its use in Nigeria. ...The paper examined the state of GIS （geographic information systems） knowledge and adoption in Nigeria, identified factors affecting its implementation and finally discussed methods of enhancing its use in Nigeria. Administrative records of some institutions and information obtained from published articles in journals and text books were used for the study. Records indicate that GIS is relatively young in Nigeria and in terms of development, it is at its youthful stage. The adoption and use of GIS is low at both Federal and State Government levels. However, factors such as, lack of political will, shortage of experts to train the professionals, lack of standardization of digital data, database development and management problems, institutional constraints, security implications of digital maps and poor funding have been inhibiting full adoption, implementation and use of GIS in Nigeria. There is the need to develop a GIS vision in the country and government should formulate policy and create enabling environment for the adoption and implementation of the new technology.展开更多
文摘The present situation of researches on full text databases and their retrieval method in China since 1990s are described.To have a better understanding of the development process of full text databases and their retrieval method,the focus and trend of the researches are discussed so as to provide references for their future development.
文摘The paper starts with an introduction to the development process of database technologies.Then,it discusses the techniques and methods used to develop multimedia database.Finally,taking the Information Management System of Graduate Students as an example,it describes the design process of a simple multimedia database.
基金funded by the Australian Coal Association Research Program(ACARP)
文摘This paper presents a new risk assessment methodology for coal mine excavated slopes. This new empirical-statistical slope.stability assessment m. ethodology （SSAM! is intended for use by geotechnical engineers at both the design review and operational stages of a mine＇s life to categonse the risk of an excavated coal mine slope. A likelihood of failure is determined using a new slope stability classification system for excavated coal mine slopes developed using a database of 119 intact and failed case studies sourced from open cut coal mines in Australia. Consequence of failure is based on slope height and stand-off distance at the toe of the excavated slope. Results are presented in a new risk matrix, with slope risk being divided into low, medium and high categories. The SSAM is put forward as a new risk assess- ment methodology to assess the potential for, and consequence of, excavated coal mine slope failure. Unlike existing classification systems, assumptions about the likely failure mode or mechanism are not required. Instead, the SSAM applies an approach which compares the conditions present within the exca- vated slope face, with the known past performance of slopes with similar geotechnical and geometrical conditions, to estimate the slope＇s propensity for failure. The SSAM is novel in that it considers the depo- sitional history of strata in an excavated slope and how this sequence affects slope stability. It is further novel in that it does not require explicit measurements of intact rock, rock mass and/or defect strength to rapidly calculate a slope＇s likelihood of failure and overall risk. Ratings can be determined entirely from visual observations of the excavated slope face. The new SSAM is designed to be used in conjunction with existing slope stability assessment tools.
文摘Groundwater is an essential source of drinking water for many Indian urban habitats. Large numbers of people consume ground water instead of municipal tap water due to contamination of tap water. Groundwater is extracted from thousands of bore wells, and used for potable purpose without proper testing and treatment. This paper describes a groundwater quality monitoring strategy and database model developed for Gulbarga city, located in Karnataka, India. Sampling wells are selected one each in 55 wards of the city corporation having easy access for regular sampling. Various attributes of sampling wells including their spatial coordinates, location address and a photograph are registered for ready recognition on site. Water samples are collected and analyzed for various physico-chemical parameters. Spatial coordinates and levels of sampling points are measured on site using a hand held GPS instrument. Gulbarga city map is digitized. A GIS database of the measured spatial and water quality data is developed using ArcGIS Desktop 9.3, and ground water quality maps are prepared which may serve as useful tools for developing policy, and regulatory mechanism for sustainable groundwater use.
文摘The paper examined the state of GIS （geographic information systems） knowledge and adoption in Nigeria, identified factors affecting its implementation and finally discussed methods of enhancing its use in Nigeria. Administrative records of some institutions and information obtained from published articles in journals and text books were used for the study. Records indicate that GIS is relatively young in Nigeria and in terms of development, it is at its youthful stage. The adoption and use of GIS is low at both Federal and State Government levels. However, factors such as, lack of political will, shortage of experts to train the professionals, lack of standardization of digital data, database development and management problems, institutional constraints, security implications of digital maps and poor funding have been inhibiting full adoption, implementation and use of GIS in Nigeria. There is the need to develop a GIS vision in the country and government should formulate policy and create enabling environment for the adoption and implementation of the new technology.
