Workshop on Drought Forecasting for Northeast Brazil

Precipitation forecasting parameters for northeast Brazil were developed. Hydrological, sociological, and economic aspects were examined. A drought forecasting model is presented

A colimit decomposition for homotopy algebras in Cat

Badzioch showed that in the category of simplicial sets each homotopy algebra of a Lawvere theory is weakly equivalent to a strict algebra. In seeking to extend this result to other contexts Rosicky observed a key point to be that each homotopy colimit in simplicial sets admits a decomposition into a homotopy sifted colimit of finite coproducts, and asked the author whether a similar decomposition holds in the 2-category of categories Cat. Our purpose in the present paper is to show that this is the case.Comment: Some notation changed; small amount of exposition added in intr

Magnetic Resonance

Contains research objectives and reports on three research projects

A New FPN Cancellation Circuit for Time-Domain CMOS Image Sensors

A fixed-pattern noise correction technique for time-domain CMOS imagers with high dynamic range is presented in this chapter. Analytical derivations are presented showing how the circuit variations affect the time measured. The error in the time measured can be reduced by using lower reference voltages achieving values smaller than 4%. The fixed-pattern noise correction technique proposed is based on a new readout method for time-domain imagers employing two reference voltages for the discharge time measurement. This new technique is non-sensitive to circuit parameter variations that contribute to fixed-pattern noise such as hold voltages of transistors. A simple electronic circuit is proposed to implement the technique. Circuit and simulation results are presented to demonstrate the feasibility of the proposed technique

A shortening of the life-cycle of major tropical cyclones

In this study a comprehensive picture of the changing intensity life cycle of major (Category 3 and higher) tropical cyclones (TCs) is presented. Over the past decades, the lifetime maximum intensity has increased, but there has also been a significant decrease in duration of time spent at intensities greater than Category 1. These compensating effects have maintained a stable global mean‐accumulated cyclone energy of individual major TCs. The global mean duration of major TCs has shortened by about 1 day from 1982 to 2018. There has been both faster intensification (Categories 1 to 3) and weakening (Categories 3 to 1) by about 40%. The probabilities of rapid intensification and rapid weakening have both risen in the period 2000–2018 compared to 1982–1999. A statistically significant anticorrelation is found between the lifetime maximum intensity and the following duration of the final weakening. This suggests an element of self‐regulation of TC life cycles

Численное моделирование теплофизических условий реализации режима циркулирующего кипящего слоя применительно к топкам котлов

Актуальность проведения исследований, направленных на совершенствование методов численного анализа аэротермохимических процессов в топках с циркулирующим кипящим слоем на основе компьютерного математического моделирования, является весьма высокой для обоснования основных проектно-конструкторских и режимно-эксплуатационных параметров при создании котлов с ЦКС. С помощью наработанных численных расчетов возможно не только правильно осмыслять и понимать физические явления, наблюдаемые, например, на экспериментальных установках, но и в некоторых случаях заменить физический или натуральный эксперимент компьютерным как более дешевым и менее трудоемким.The relevance of research aimed at improving the methods of numerical analysis of aerothermochemical processes in furnaces with a circulating fluidized bed based on computer mathematical modeling is very high for justifying the main design and operational parameters creating boilers with CFB. With the help of accumulated numerical calculations, it is possible not only to correctly comprehend and understand the physical phenomena observed, for example, in experimental installations, but also in some cases to replace a physical or natural experiment with a computer one as cheaper and less time-consuming

Magnetic Resonance

Contains research objectives and reports on three research projects