Water-quality and ancillary data collected from the Arroyo Colorado near Rio Hondo, Texas, 2006

Quantification of quality parameters of inland and near shore waters by means of remote sensing has encountered varying degrees of success in spite of the high variability of the parameters under consideration and limitations of remote sensors themselves. This paper comprehensively evaluates the quantification of four types of water quality parameters: inorganic sediment particles, phytoplankton pigments, coloured dissolved organic material and Secchi disk depth. It concentrates on quantification requirements, as well as the options in selecting the most appropriate sensor data for the purpose. Relevant factors, such as quantification implementation and validation of the quantified results are also extensively discussed. This review reveals that the relationship between in situ samples and their corresponding remotely sensed data can be linear or nonlinear, but are nearly always site-specific. The quantification has been attempted from terrestrial satellite data largely for suspended sediments and chlorophyll concentrations. The quantification has been implemented through integration of remotely sensed imagery data, in situ water samples and ancillary data in a geographic information system (GIS). The introduction of GIS makes the quantification feasible for more variables at an increasingly higher accuracy. Affected by the number and quality of in situ samples, accuracy of quantification has been reported in different ways and varies widely.

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Synthesis of gamma-cyclodextrin based metal-organic frameworks (MOFs) to improve water quality

10.1021/scimeetings.0c02885 ◽

2020 ◽

Author(s):

Grace Tews ◽

Megan Moyer ◽

Sonja Katt

Keyword(s):

Water Quality ◽

Metal Organic Frameworks ◽

Metal Organic ◽

Improve Water Quality ◽

Gamma Cyclodextrin

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Investigation into Cigarette Smoking and Atmospheric Pollution in the Aetiology of Lung Cancer

Methods of Information in Medicine ◽

10.1055/s-0038-1636169 ◽

1963 ◽

Vol 2 (01) ◽

pp. 13-19 ◽

Cited By ~ 2

Author(s):

R. Doll

Keyword(s):

Lung Cancer ◽

Cigarette Smoking ◽

Atmospheric Pollution ◽

Direct Evidence ◽

Retrospective Studies ◽

Common Factor ◽

Animal Experiments ◽

Smoking Habits ◽

Careful Examination ◽

Ancillary Data

The evidence that cigarette smoking and atmospheric pcllution are causes of lung cancer is largely statistical. The first evidence was indirect; that is, i1. was noticed that in many countries the incidence of lung cancer had increased and that the increase could be correlated with changes in the prevalence of cigarette smoking and of certain types of atmospheric pollution.Since then much direct evidence has been obtained. The relationship between cigarette smoking and lung cancer has been demonstrated retrospectively by comparing the smoking habits of patients with and without lung cancer and prospectively by observing the mortality from lung cancer in groups of persons of known smoking habits. Conclusions can be drawn from these studies only after careful examination of the results. In particular it is important in retrospective studies to test a) the reproducibility of the data, b) the representativeness of the data, and c) the comparability of the special series and their controls. The resul1.s of retrospective studies are all similar and all show a close relationship between cigarette smoking and the disease.The results have been confirmed by pro~pective studies which are lesF. open to bias. The results can be explained if cigarette smoking causes lung cancer or if both are related to some third common factor. Ancillary data (pathological changes in the bronchial mucosa, animal experiments, etc.) support the causal hypothesis.The evidence relating to atmospheric pollution is less definite and it is difficult to get direct evidence of a relationship in the individual. It is clear that pollution has little effect in the absence of smoking, but the mortality associated with a given amount of smoking is generally greater in large towns than in the countryside and among men who have emigrated from Britain than among men who have lived all their lives in less polluted countries.

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