Spectroscopic Observations of Twenty-one Faint Cataclysmic Variables Candidates

We provide the first minimum light spectroscopic observations for 21 previously known or suspected faint cataclysmic variable candidates. The sources were selected from the Downes et al. (2001) living edition catalog and the identified candidates have minimum light magnitudes of V~18-22. We confirm 15 of the candidates to be cataclysmic variables.Comment: 10 pages, 4 figures, accepted by A&

panish, French and British Encounters with Native American Cultures, from Colonial Guatemala to Virginia

Die Kolonialisierung der Neuen Welt führte zu beispiellosen politischen und sozialen Ver-änderungen, die sich für die Betroffenen u. a. je nach Kontaktzeitraum und Art und Weiseder Begegnung(en) unterschieden. Manche Informationen über diese Begegnungen findensich in ethnohistorischen Quellen, allerdings sind diese oftmals einseitig und die Mate-riallage ist abhängig von Umweltfaktoren und Ausgrabungsmethoden. Auch Musik undMusikveranstaltungen können kulturelle Botschaften bewahren, die menschlicher und na-türlicher ,Zensur‘ entkommen sind. In diesem Beitrag werden musikalische Zeugnisse alsAnalyseperspektive verwendet, durch die die Kontaktreichweite der Einwirkungen auf Eu-ropäer*innen und ,Amerindians‘ in drei Interaktionsräumen beobachtet werden sollen

Viking planetary quarantine procedures and implementation

Some of the techniques and methodology that were used on Viking to implement planetary quarantine requirements are reported. Special attention was given to techniques and approaches used to implement sterilization of the Viking probe. Quarantine procedures for unmanned planetary missions and procedures for microbiological contamination of space hardware are included. A probability of contamination of the biological instruments onboard by terrestrial organisms was examined

Book review: 9/11 ten years after: perspectives and problems

Ten years on, what have been the principal impacts of the terrorist attacks of 9/11 on the external policies and international outlooks of the world’s major powers? This book investigates a range of international responses to the events of 9/11, to evaluate their consistency over time; to analyse their long-term significance and to consider both their implications for the international security agenda and the prospects for international cooperation in addressing the challenges posed. Jude Howell believes the breadth of the book will ensure that it provides a useful source for researchers and students in the fields of security studies and international relations

Improved method of optical design

Optical system designed by third order aberration theory is significantly improved by placing it into a ray deviation design program composed of two distinct computer programs. Tests were conducted on telescope systems, an ultraviolet relay lens, and a four lens corrector system

General optics evaluation program (GENOPTICS)

Program prints and plots results of computations such as ray traces, radial energy distributions, and designs of two-mirror telescopes

Microstrip antennas

It is possible to design and construct simple, efficient microwave antenna, either linearly or circularly polarized, which should be useful in phased arrays. Mounted on thin dielectric substrate, it extends slightly above ground plane. Space behind ground plane is required for feed line and mounting hardware