Comparison of satellite based cloud retrieval methods for cirrus and stratocumulus

One difficulty in using satellite remote sensing data is the spatial variability of cloud properties on scales smaller than most meteorological satellite fields of view (approx. 4 to 8 km). The variation is examined of satellite derived cloud cover as a function of the satellite sensor spatial resolution for seven cloud cover retrieval methods: (1) Reflectance threshold; (2) Temperature threshold; (3) ISCCP; (4) HBTM (Hybrid Bispectral Threshold Method); (5) NCLE; (6) Spatial coherence; and (7) Functional Box Counting. The first two methods are simple single spectral thresholds which specify a satellite pixel as cloud filled if the measured reflectance is greater than the threshold, or if the measured equivalent blackbody temperature is less than the threshold. The next three methods are bispectral, using one visible wavelength window channel and one thermal infrared wavelength window. The final two algorithms rely on the spatial variability within the cloud field to determine cloud cover. Spatial coherence assumes only that the cloud field occurs in a single layer and that the clouds are optically thick in the infrared window. LANDSAT Thematic Mapper (TM) data is used to test the spatial resolution dependence of the cloud algorithms. The ISCCP bispectral threshold applied to the full resolution data is used as the reference or truth cloud cover, after which the retrieval methods are applied to the spatial resolutions. Studies of the fraction of pixels in the scene at cloud edge, and of the profile of reflectance and temperature near cloud edges indicate an uncertainty in the reference cloud fraction of 1 to 5 percent

Precautionary Saving and Consumption Fluctuations

This paper uses the consumption Euler equation to derive a decomposition of consumption growth into four sources. These are new information and three sources of predictable consumption growth: intertemporal substitution, changes in the preferences for consumption, and incomplete markets for consumption in- surance. Using data on the expenditures of households, we implement the decom- position for the average growth rate of consumption expenditures on nondurable goods in the U.S. from the beginning of 1982 to the end of 1997. Incomplete markets for trading consumption in future states lead to statistically signiÞcant and countercyclical movements in expected consumption growth: consumption growth is expected to be higher when the unemployment rate is high. The eco- nomic importance of precautionary saving rivals that of the real interest rate, but the relative importance of each source of movement in the volatility of consump- tion is not precisely measured.

The characterization of feces and urine: a review of the literature to inform advanced treatment technology

The safe disposal of human excreta is of paramount importance for the health and welfare of populations living in low income countries as well as the prevention of pollution to the surrounding environment. On-site sanitation (OSS) systems are the most numerous means of treating excreta in low income countries, these facilities aim at treating human waste at source and can provide a hygienic and affordable method of waste disposal. However, current OSS systems need improvement and require further research and development. Development of OSS facilities that treat excreta at, or close to, its source require knowledge of the waste stream entering the system. Data regarding the generation rate and the chemical and physical composition of fresh feces and urine was collected from the medical literature as well as the treatability sector. The data were summarized and statistical analysis was used to quantify the major factors that were a significant cause of variability. The impact of this data on biological processes, thermal processes, physical separators, and chemical processes was then assessed. Results showed that the median fecal wet mass production was 128 g/cap/day, with a median dry mass of 29 g/cap/day. Fecal output in healthy individuals was 1.20 defecations per 24 hr period and the main factor affecting fecal mass was the fiber intake of the population. Fecal wet mass values were increased by a factor of 2 in low income countries (high fiber intakes) in comparison to values found in high income countries (low fiber intakes). Feces had a median pH of 6.64 and were composed of 74.6% water. Bacterial biomass is the major component (25–54% of dry solids) of the organic fraction of the feces. Undigested carbohydrate, fiber, protein, and fat comprise the remainder and the amounts depend on diet and diarrhea prevalence in the population. The inorganic component of the feces is primarily undigested dietary elements that also depend on dietary supply. Median urine generation rates were 1.42 L/cap/day with a dry solids content of 59 g/cap/day. Variation in the volume and composition of urine is caused by differences in physical exertion, environmental conditions, as well as water, salt, and high protein intakes. Urine has a pH 6.2 and contains the largest fractions of nitrogen, phosphorus, and potassium released from the body. The urinary excretion of nitrogen was significant (10.98 g/cap/day) with urea the most predominant constituent making up over 50% of total organic solids. The dietary intake of food and fluid is the major cause of variation in both the fecal and urine composition and these variables should always be considered if the generation rate, physical, and chemical composition of feces and urine is to be accurately predicted

An Improved Method for Transferring Nucleic Acids to Nylon Membranes

Methods currently in use for the separation and identification of specific segments of nucleic acids involve long transfer periods or elaborate apparatuses and result in the production of a single blot. Contamination by organisms or enzymes is always a factor to be dealt with. An improved method for transferring nucleic acids from acrylamide or agarose gels for use in hybridization has been developed. This method uses NaOH as the blotting medium to improve the rate and efficiency of transfer to nylon membranes. As many as six blots can be obtained within one hour using this method. This method is effective for both viral double-strand RNA and single-strand RNA. By using 0.2 N NaOH as the transfer medium, and using nylon membranes for blotting, the nucleic acid appears to be covalently fixed to the membrane. These blots can be stripped of the probe and reused. In our studies with viral dsRNA, as little as 3.2 ng of total nucleic acid can be detected on the blot. This method provides a great improvement over previous methods for blotting and hybridization of both ss-and dsRNA and shows promise for use with dsDNA

Changing authoritarians\u27 attitudes: The role of authority legitimacy

This study investigated the tendency of right-wing authoritarians (RWAs) to yield to established and legitimate authorities. University students enrolled in an Introductory Psychology course read two persuasive passages. One passage concerned whether homosexuals should be allowed to become schoolteachers, while the other discussed whether an aggressive proselytizing religious group should be allowed to recruit students on university campuses. Some of the participants were informed that the passage was written by a highly established and legitimate authority; others were told the passage came from a less established and legitimate authority. In addition, the passages were manipulated so that half supported and half argued against the relevant issue. Participants’ attitudes towards these issues were assessed both before and after reading each passage and an attitude change score was calculated. It was proposed that the authoritarian submission component of the high RWA\u27s personality predisposes authoritarians to use a decision-making heuristic akin to Established and legitimate authorities are usually correct when responding to a persuasive message. Therefore, it was expected that high RWAs’ attitudes towards the issues would be more influenced by the authority legitimacy of the passage authors than would those of low RWAs. Contrary to expectations, high RWAs were Q9; influenced by the authority legitimacy manipulation. However, high RWAs, more often than low RWAs, reported an intention to comply with a counter-attitudinal law. They also tended to rate established and legitimate authorities as having more authority over their personal attitudes concerning the two issues than did low RWAs. Several explanations are discussed concerning why the high RWAs were not influenced by the authority legitimacy manipulation within the persuasion context of this study

The Uncertain Future of Felon Disenfranchisement

Felons represent a large majority of disenfranchised adult Americans, with a significant proportion remaining unable to vote even after completing the entirety of their sentences. As voter eligibility requirements become an increasingly contested partisan battlefield, the fate of these disenfranchised individuals has become increasingly unclear. With this backdrop in mind, we consider recent developments in felon disenfranchisement, the prospects for future legislative action, and the legal arguments that litigants might employ to challenge the practice. In so doing, we exploit newly collected polling data to determine (1) whether Americans are ready to end felon disenfranchisement, and (2) under what circumstances they believe felon disenfranchisement constitutes excessive punishment. Examining these results, we conclude that the prospects for an immediate end to felon disenfranchisement are limited and that a categorical challenge to disenfranchisement under the Eighth Amendment would be doomed to fail. However, our results do suggest that a limited set of “gross disproportionality” challenges could plausibly succeed in states with lifetime disenfranchisement laws. We finish by discussing the disparate impact of disenfranchisement laws on African-Americans and consider the prospects for challenging these laws under the Voting Rights Act

Diagnosis of an anaerobic pond treating temperate domestic wastewater: An alternative sludge strategy for small works

An anaerobic pond (AP) for treatment of temperate domestic wastewater has been studied as a small works sludge management strategy to challenge existing practice which comprises solids separation followed by open sludge storage, for up to 90 days. During the study, effluent temperature ranged between 0.1 °C and 21.1 °C. Soluble COD production was noted in the AP at effluent temperatures typically greater than 10 °C and was coincident with an increase in effluent volatile fatty acids (VFA) concentration, which is indicative of anaerobic degradation. Analysis from ports sited along the AP's length, demonstrated VFA to be primarily formed nearest the inlet where most solids deposition initially incurred, and confirmed the anaerobic reduction of sludge within this chamber. Importantly, the sludge accumulation rate was 0.06 m3 capita−1 y−1 which is in the range of APs operated at higher temperatures and suggests a de-sludge interval of 2.3–3.8 years, up to 10 times longer than current practice for small works. Coincident with the solids deposition profile, biogas production was predominantly noted in the initial AP section, though biogas production increased further along the AP's length following start-up. A statistically significant increase in mean biogas production of greater than an order of magnitude was measured between winters (t(n=19) = 5.52, P < 0.001) demonstrating continued acclimation. The maximum methane yield recorded was 2630 mgCH4 PE−1 d−1, approximately fifty times greater than estimated from sludge storage (57 mgCH4 PE−1 d−1). Anaerobic ponds at small works can therefore enable sludge reduction and longer sludge holding times than present thus offsetting tanker demand whilst reducing fugitive methane emissions currently associated with sludge storage, and based on the enhanced yield noted, could provide a viable opportunity for local energy generation