The Edinburgh-Cape blue object survey

The Edinburgh-Cape Blue Object Survey is a major survey to discover blue stellar objects brighter than B 18 in the southern sky. It is covering an area of sky of 10,000 square degrees with |b| > 30° and < 0°. The blue stellar objects are selected by automatic techniques from U and B pairs of UK Schmidt Telescope plates scanned with the COSMOS measuring machine. Follow-up photometry and spectroscopy are being obtained with the SAAO telescopes to classify objects brighter than B = 16.5. This paper describes the survey, the techniques used to extract the blue stellar objects, the photometric accuracy, the spectroscopic classification, and the completeness of the survey.     

Spectrothermography of carbonaceous particles

Spectrothermography, defined as the evaluation of thermograms of carbon evolved from heated aerosol samples, is a technique for evaluating differences in particle characteristics as they relate to emission sources and processes that modify particle evolution. Here we describe the inherent uncertainties and demonstrate the utility of this technique with an evaluation of samples that were collected with eight stage cascade impactors at three sites in Mexico City over a period of 5 months. The study was implemented with statistical analysis based on tests for goodness of fit to separate thermograms with distinctive shapes related to the relative amounts of organic and elemental carbon mass that evolves as a function of temperature. Thermograms with unique shapes were found for particles with aerodynamic diameters of 1–10, 0.56–1, 0.32–0.56 and 0.18–0.32 μm with further differentiation of curves related to the relative amounts of gasoline and diesel fuel that was combusted in the region of the three sites. The common shapes fit 32–42% of samples in each particle size range and indicate that this type of analysis can help distinguish differences in the primary sources of organic and elemental carbon.

内蒙锡盟新生代玄武岩的岩石学研究

依照地层顺序和火山机构的完好程度,内蒙锡盟新生代玄武岩可粗略划分为三期。各期玄武岩又可分出若干层(次)。玄武岩由含量不等的橄榄石、单斜辉石和斜长石斑晶及基质组成。部分玄武岩含有二辉橄榄岩等深源包体。斑晶矿物均具有成分环带。矿物化学、岩石化学资料揭示出本区玄武岩从原生岩浆到进化岩浆的主要演化机制是以橄榄石为主的分离结晶作用,同时在部分进化岩浆中还存在岩浆混合作用。稀土元素资料还指出了一个形成本区原生岩浆以及派生岩浆的原生母岩浆的重要机制:上地幔渐进的部分熔融作用。