Gas chromatography remains the world's most widely used analytical technique, yet the expertise of a large proportion of chromatographers lies in other fields. Many users have little real knowledge of the variablesin the chromatographic process, the interaction between those variables, how they are best controlled, how the quality of their analytical results could be improved, and how analysis times can be shortened to facilitate the generation of a greater numberof more reliable results on the same equipment. An analyst with a more comprehensive understanding of chromatographic principles and practice, however, can often improve the quality of the data generated, reduce the analytical time, and forestall the needto purchase an additional chromatograph or another mass spectrometer.The Second Edition of Analytical Gas Chromatography is extensively revised with selected areas expanded and many new explanations and figures. The section on sample injection has been updated to include newer concepts of split, splitless, hot and cold on-column, programmed temperature vaporization, and large volume injections. Coverage of stationary phases now includes discussion, applications, and rationale of the increased thermal and oxidative resistance of the newly designed silarylenepolysiloxane polymers. Conventional and"extended range"polyethylene glycol stationary phases are examined from the viewpoints of temperature range and retention index reliabilities, and the chapter on"Variables"has been completely rewritten. The ways in which carrier gas velocity influences chromatographic performance is considered in detail, and includes what may be the first rational explanation of the seemingly anomalous effects that temperature exercises on gas viscosity (and gas flow). The practical effects that these changes cause to the chromatography is examined in pressure-, flow-, and"EPC-"regulated systems."Column Selection, Installation, and Use"has been completely rewritten as well. The accuracy of theVan Deemter plots has been greatly enhanced; a new program corrects for the first time for the changes in gas density and diffusion that occur during the chromatographic process because of solute progression through the pressure drop of the column. A new section has also been added on meeting thespecial requirements of columns destined for mass spectral analysis. The chapter on"Special Applications"has been expanded to include considerations of"selectivity tuning,"of fast analysis, and the section of Applications has been thoroughly updated and expanded.
Key Features
* Incorporates nearly 60% new material
* Covers the newest concepts and materials for sample injection and stationary phases
* Presents detailed consideration of the influence of carrier gas velocity on practical aspects of chromatographic performance
* Contains a chapter on "Special Analytical Techniques" which includes consideration of selectivity tuning and fast analysis
* Provides a new section addressing the special requirements of columns to be used in mass spectral analysis
* Includes an improved program that greatly enhances the accuracy of the Van Deemter plots by more accurately depicting localized chromatographic conditions at each point in the column

Declamationes, das sind Aoebungsreden A1/4ber fiktive Themen im Rhetorikunterricht, durch die der SchA1/4ler auf seine etwaige spAtere RednertAtigkeit in der Politik, vor allem aber auch vor Gericht vorbereitet werden soll. Musterbeispiele solcher Reden konnten der Unterhaltung eines grAAeren Publikums dienen. In dieser Form rA1/4ckten sie in die NAhe anderer Prunkreden, die z.B. der Feier einer besonderen Gelegenheit oder WA1/4rdigung einer zu ehrenden Person diesen sollten. Der vorliegende Sammelband dokumentiert den aktuellen Forschungsstand zu verschiedenen Mustern der "klangvollen Rede" von der Antike bis zur Neuzeit und ist somit ein Beitrag fA1/4r eine fAcherA1/4bergreifende Diskussion zum Gattungsbegriff der declamatio, aber auch zur Geschichte der Rhetorik insgesamt.

Das Klassische kann als ein konstitutiver Teil der Moderne gelten. So ist die Auseinandersetzung mit dem antiken Denken immer auch eine Auseinandersetzung mit der eigenen Kultur. In verstAndlich und anschaulich geschriebenen Texten stellen die Autoren dieses Bandes die Frage nach der AktualitAt antiker Ideen und Konzepte in den Wissenschaften und den kreativen KA1/4nsten, in der Politik und in der Alltagskultur. Die BeitrAge sind das Resultat der Veranstaltung "Antike und Gegenwart," eines Gemeinschaftsprojekts der Berlin-Brandenburgischen Akademie der Wissenschaften und der Akademie der KA1/4nste, Berlin. Das Symposion hat gezeigt, daA InterdisziplinaritAt nicht nur den aktiven Austausch akademischer Disziplinen untereinander, sondern darA1/4ber hinaus auch das produktive Zusammenspiel der Wissenschaften und der KA1/4nste bedeuten kann. Zu den Autoren gehAren A1/4ber ihre Fachgrenzen hinaus bekannte Historiker, Politologen und Juristen, Naturwissenschaftler und Wissenschaftshistoriker, Klassische Philologen und Philosophen, Kunsthistoriker, Musikwissenschaftler und Schriftsteller: W. Burkert, H. Danuser, M. Diers, V. Gerhardt, A. Gierer, D. GrA1/4nbein, H. Hofmann, W. Jens, E. Knobloch, Chr. Meier, J. MittelstraA, H. MA1/4nkler, W. Nippel, B. Seidensticker und Ph. Ursprung.

Poems by and biographies of inmates of the Dachau Concentration Camp, testimonies to the persistence of the humanity and creativity of the individual in the face of extreme suffering. The concentration camp at Dachau was the first established by the Nazis, opened shortly after Hitler came to power in 1933. It first held political prisoners, but later also forced laborers, Soviet POWs, Jews, and other "undesirables." More than 30,000 deaths were documented there, with many more unrecorded. In the midst of the horror, some inmates turned to poetry to provide comfort, to preserve their sense of humanity, or to document their experiences. Some were or would later become established poets; others were prominent politicians or theologians; still others were ordinary men and women. This anthology contains 68 poems by 32 inmates of Dachau, in 10 different originallanguages and facing-page English translation, along with short biographies. A foreword by Walter Jens and an introduction by Dorothea Heiser from the original German edition are joined here by a foreword by Stuart Taberner of theUniversity of Leeds. All the poems, having arisen in the experience or memory of extreme human suffering, are testimonies to the persistence of the humanity and creativity of the individual. They are also a warning not to forgetthe darkest chapter of history and a challenge to the future not to allow it to be repeated. Dorothea Heiser holds an MA from the University of Freiburg. Stuart Taberner is Professor of Contemporary German Literature, Culture, and Society at the University of Leeds.

The lectures collected in this volume shed some fascinating light on Hans Kung's career and present a moving picture of one of the greatest theologians of our time.