Justus Liebig - Life and Work

Zadanie pt. Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej naukę

A Geographic Perspective of Cuban Landscapes

Beginning in the era of the Spanish conquest and taking the reader right up to the present day, this book focuses on how the landscape of Cuba has changed and evolved into the environment we see today. It illustrates the range of factors – economic, political and cultural – that have determined Cuba’s physical geography, and explores the shifting conservation measures which have been instituted in response to new methods in agriculture and land management. The text uses historical documents, fieldwork, Geographic Information System (GIS) data and remotely-sensed satellite imagery to detail Cuba’s extensive land-use history as well as its potential future. The author goes further to analyze the manner, speed and methods of landscape change, and examines the historical context and governing agendas that have had an impact on the relationship between Cuba’s inhabitants and their island. Gebelein also assesses the key role played by agricultural production in the framework of international trade required to sustain Cuba’s people and its economy. The book concludes with a review of current efforts by Cuban and other research scientists, as well as private investors, conservation managers and university professors who are involved in shaping Cuba’s evolving landscape and managing it during the country’s possible transition to a more politically diverse, enfranchised and open polity.https://digitalcommons.fiu.edu/books/1001/thumbnail.jp

Parametric, nonparametric and parametric modelling of a chaotic circuit time series

The determination of a differential equation underlying a measured time series is a frequently arising task in nonlinear time series analysis. In the validation of a proposed model one often faces the dilemma that it is hard to decide whether possible discrepancies between the time series and model output are caused by an inappropriate model or by bad estimates of parameters in a correct type of model, or both. We propose a combination of parametric modelling based on Bock's multiple shooting algorithm and nonparametric modelling based on optimal transformations as a strategy to test proposed models and if rejected suggest and test new ones. We exemplify this strategy on an experimental time series from a chaotic circuit where we obtain an extremely accurate reconstruction of the observed attractor.Comment: 19 pages, 8 Fig

Almost Perfect Privacy for Additive Gaussian Privacy Filters

We study the maximal mutual information about a random variable $Y$ (representing non-private information) displayed through an additive Gaussian channel when guaranteeing that only $\epsilon$ bits of information is leaked about a random variable $X$ (representing private information) that is correlated with $Y$. Denoting this quantity by $g_\epsilon(X,Y)$, we show that for perfect privacy, i.e., $\epsilon=0$, one has $g_0(X,Y)=0$ for any pair of absolutely continuous random variables $(X,Y)$ and then derive a second-order approximation for $g_\epsilon(X,Y)$ for small $\epsilon$. This approximation is shown to be related to the strong data processing inequality for mutual information under suitable conditions on the joint distribution $P_{XY}$. Next, motivated by an operational interpretation of data privacy, we formulate the privacy-utility tradeoff in the same setup using estimation-theoretic quantities and obtain explicit bounds for this tradeoff when $\epsilon$ is sufficiently small using the approximation formula derived for $g_\epsilon(X,Y)$.Comment: 20 pages. To appear in Springer-Verla

Labor supplies of a seasonal industry

Thesis (M.A.)--Boston UniversityMuch of the literature dealing with employment in seasonal industries with sharp peaks or short active seasons states or implies that all such industries employ, mostly, temporar.y entrants to the labor force during their active seasons who withdraw when that season is over. This seems to be an e~ension of the observation of the practice in summer resort and other industries with a short summer peak to all (resort and other) industries with short active seasons. It is questionable whether this is actually true for seasonal winter resort industries, particularly in non-urban areas. This study proposes to examine the labor supplies of a winter seasonal industry with a test of that assumption in view. It is proposed, also, that the concepts of primary and secondary members of the labor force, introduced by Wilcock, be utilized in the study. Such concepts which differentiate between workers who belong regularly to the labor force and those who enter and leave at various intervals should prove useful when dealing with seasonal employment and seasonal workers [TRUNCATED

Astronaut-Acquired Photography of Earth: Its History and Continued Applicability in Quantitative Analyses

Aerial and satellite photography has been used extensively in many different research efforts, for example, atmospheric studies, vegetation analysis, and change detection. Archives of historical aerial and satellite photography are a valuable resource to the science community. There is currently an archive of over 450,000 photographs of Earth taken by United States astronauts dating back to the early 1960\u27s. This archive covers the majority of the Earth\u27s surface and offers imagery taken by a variety of camera configurations including film and digital, various lenses, different look angles, and changing solar illuminance. There is extensive repeat coverage over many regions of the world\u27s landscape. These photographs have been increasingly analyzed in order to assess their potential as a remote sensing resource. The objectives of this paper are to give the reader an evolutionary history of astronaut-acquired imagery of Earth, and to discuss the many scientific analyses that have been successfully completed using this underutilized resource