9 x 9 – A Method of Design最新文献_第2页

A Method of Design: Observations and Insights 设计方法:观察与洞察

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-005

Marcello Nasso, F. Hauser

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Materiality 物质

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-013

E. Tröger

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Envelope 信封

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-009

A. Caruso

{"title":"Envelope","authors":"A. Caruso","doi":"10.1515/9783035610994-009","DOIUrl":"https://doi.org/10.1515/9783035610994-009","url":null,"abstract":"We present radiative Rosseland mean opacity tables calculated with the OPAL code (Iglesias and Rogers 1991) which removes several approximations present in previous calculations. In particular, improvements in the atomic physics have been incorporated which yield reasonably accurate photon absorption data (accuracy comparable to single-configuration, self-consistent field calculations with relativistic corrections) and include the configuration term splitting in the LS-coupling scheme. In some cases, the latter can increase the number of spectral lines by orders of magnitude compared to previous opacity codes. OPAL also employs an equation of state method which avoids the usual ad hoc cut offs introduced in free energy minimizaton schemes. The opacity tables are given in terms of temperature and R, where R = p/T^ with p the density and T the temperature. Extensive results are given for the Anders-Grevesse (1989) metal abundances which allow accurate interpolation in temperature, density, hydrogen mass fraction, and metal mass fraction. The range of T and R cover typical stellar conditions from the Beat Cepheids are classical Cepheids which pulsate simultaneously in the fundamental and first overtone. The two periods can be accurately disentangled and extracted from observations. In attempting to analyze such stars, use is made of the Petersen diagram where the ratio of the first overtone to fundamental period, Pl/P0,is plotted against the fundamental period P0. One approach in modelling such stars is to use linear non-adiabatic theory, with masses and luminosities mandated by stellar evolutionary calculations, to compute the fundamental and first overtone modes. The spectra of highly charged ions of NEON, ARGON, KRYPTON and XENON with few valence electrons have been studied in the 300-2100 A range using a pulsed discharge tube. For Ne spectra we found lines up to the sixth degree of ionization, We have developed a powerful technique for compacting and assessing atomic data for electron impact excitation of positive ions. Rate coefficients for such processes are derived from thermally average collision strengths T(T) which usually vary smoothly with temperature. The present method begins by scaling T in order to produce a reduced form T r . This is then plotted as a function of the scaled temperature T r which maps the entire range of T onto the interval (0,1). Y r can be accurately fitted by a 5-point cubic spline, so economising on storage while at the same time providing a convenient means for interpolating and extrapolating data. Straightforward tabulation normally requires more data points than this to cover a limited temperature range. With increasing amounts of atomic data becoming available, the problem of storage needs careful consideration. The present method is a possible solution. It forms the basis of an interactive computer program called OMEUPS which uses graphical display and is designed to be convenient for use by astrophysicists ","PeriodicalId":342376,"journal":{"name":"9 x 9 – A Method of Design","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124335454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Index / Sources 索引/资料来源

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-018

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Frontmatter

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-fm

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Between Architecture and Architecture Education 在建筑与建筑教育之间

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-002

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Architecture and Computer Science, Computer Science and Architecture 体系结构与计算机科学，计算机科学与体系结构

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-016

Michele Lanza, Marcello Nasso

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Place, Structure 地方,结构

9 x 9 – A Method of Design Pub Date : 2018-07-09 DOI: 10.1515/9783035610994-008

Andras Palffy

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