Academic literature on the topic 'Mystat Statistical Applications'

Abstract. Although solar radiation initially is unpolarized when entering the Earth's atmosphere, it is polarized by scattering processes with molecules, water droplets, ice crystals, and aerosols. Hence, measurements of the polarization state of radiation can be used to improve remote sensing of aerosols and clouds. The analysis of polarized radiance measurements requires an accurate radiative transfer model. To this end, a new efficient and flexible three-dimensional Monte Carlo code to compute polarized radiances has been developed and implemented into MYSTIC (Monte Carlo code for the phYSically correct Tracing of photons In Cloudy atmospheres). Unlike discrete ordinate methods the Monte Carlo approach allows to handle the scattering phase matrices of aerosol and cloud particles accurately, i.e. without any approximations except the inherent statistical noise. The study presented in this paper shows that this is important, especially in order to simulate scattering by aerosols and cloud droplets in the ultraviolet wavelength region. The commonly used Delta-M approximation may cause large errors not only in the calculated intensity but also in the degree of polarization. The polarized downwelling radiation field is calculated for various aerosol types showing the high sensitivity of polarized ultraviolet radiances to the particle microphysics. Model simulations are compared to ground based measurements and found to be generally in good agreement. This comparison shows that there is a high potential to retrieve information about the aerosol type from polarized radiance measurements.

The present study focussed on the information needs of the academic staff of Batchelor College.* It examined their access to and the provision of adequate and appropriate resources for the implementation of the Diploma and Associate Diploma level courses offered through the College. Batchelor College, an institute of tertiary education, is situated 100 kilometres south of Darwin, Northern Territory, Australia. The content and the modes of delivery of Batchelor College courses are specifically designed to be culturally and socially appropriate to Aboriginal people, particularly those from traditionally oriented and 'remote' communities. It can only be within this framework that informed and sensitive research can be conducted. The main purpose of the current study was to investigate the information needs of staff delivering higher education courses to 'remote' Aboriginal students of Northern Australia. Six distinct areas of study emerged: 1, to identify the information needs; 2, to analyse the information-seeking behaviour; 3, to assess the level of satisfaction with current information sources; 4, to identify inadequacies in the existing information seeking processes; 5, to identify constraints experienced; and 6, to explore how future information needs may be catered for. A mailed survey instrument was specifically designed and implemented, and it attracted a response rate of eighty-seven percent. The population under investigation was the academic staff of Batchelor College, and the variables of: 1, location; 2, sex; 3, academic school; 4, designation; 5, tenure; 6, length of service; and 7, educational background were studied in relation to the questions asked. Results of the survey were analysed using 'Mystat: Statistical Applications', (1990). Frequency distributions were computed to determine the number of respondents who selected each option. A number of questions that elicited a written response were analysed, as were the many extra comments staff members made throughout the survey. The study found that the academic staff of Batchelor College are most affected by the location variable. It appears that how staff members use, regard and value the information sources used to inform their academic practice is affected by where a staff member is located. That is, the more isolated a staff member was, both geographically and professionally, the more significant were the findings of use of information sources. The study concludes with considerations of future planning strategies that could improve the access to and use of information. The study also identifies areas for further research. * Batchelor College, an institute of tertiary education, is situated 100 kilometres south of Darwin, Northern Territory, Australia (see Appendix 3).