Mount Wilson

Norman Bridge Laboratory, California Institute of Technology and Mount Wilson Observatory, Carnegie Institution of Washington... 

After Morley s retirement, Miller continued a lonely quest for more than 20 years. He repeated the experiment many times at Cleveland and at Mount Wilson, and typically found a nonnull difference of speed around 10 km/s [53-55]. More importantly, he carried out measurements during a whole calendar day, spaced at intervals of three months. He identified seasonal variations both in the magnitude of the difference of speeds, and in the shape of the daily curve [53]. He ascribed the seasonal variations to a motion of the solar system of 208 km/s relative to the fixed stars. This velocity is of the same order of magnitude as the currently accepted ys- 10 V However, his argumentation was not clear enough at that time. 

The metal is reactive, and when strongly heated it burns rapidly in air or oxygen. Aluminum dust forms an explosive mixture with air. Under ordinary conditions, however, aluminum rapidly becomes coated with a thin, tough layer of aluminum oxide, which protects it against further corrosion. This protection is so effective that the sixty-inch and hundred-inch telescope mirrors on Mount Wilson have not... 

Hubble. Edwin Powell (1889-1953) US astronomer, who worked at both the Yerkes Observatory and the Mount Wilson Observatory. Most of his studies involved nebulae and galaxies, which he classified in 1926. In 1929 he established the Hubble constant, which enabled him to estimate the age of the universe. The Hubble space telescope is named after him. 

Possibly, the first quantitative NIR measurement was the determination of atmospheric moisture at the Mount Wilson observatory by F. E. Fowle in 1912 [6] followed, in 1938, by Ellis and Bath [7] who determined amount of water in gelatin. In the early 1940s, Barchewitz [8] analyzed fuels and Barr and Harp [9] published the spectra of some vegetable oils. In the late 1940s Harry Willis, working at ICI, used a prewar spectrometer to characterize polymers and later employed NIR for the measurement of the thickness of polymer films. 

McKellar A (1940) Evidence Iot the molecular origin of some hitherto unidentified intersteffar lines. Publ Astronom Soc Pac 52 187 (b) Adams WS (1941) Some results with the Coude spectrograph of the Mount Wilson observatory. Astrophys J 93 11 (c) Douglas AE, Herzberg G (1941) CH in interstellar space and in the laboratory. Astrophys J 94 381... 

Glass-ionomer cements become less susceptible to desiccation as they age, because a greater proportion of the water in older cements has become tightly bound . Early contact with moisture is also damaging, and this problem is overcome clinically to some extent by using some sort of protection such as clear nail varnish to seal the cement during its early life (Wilson McLean, 1988). However, this does not give perfect results, and as yet there is no ideal barrier material for this purpose (Earl, Hume Mount, 1985). 

The glass polyalkenoate cement uniquely combines translucency with the ability to bond to untreated tooth material and bone. Indeed, the only other cement to possess translucency is the dental silicate cement, while the zinc polycarboxylate cement is the only other adhesive cement. It is also an agent for the sustained release of fluoride. For these reasons the glass polyalkenoate cement has many applications in dentistry as well as being a candidate bone cement. Its translucency makes it a favoured material both for the restoration of front teeth and to cement translucent porcelain teeth and veneers. Its adhesive quality reduces and sometimes eliminates the need for the use of the dental drill. The release of fluoride from this cement protects neighbouring tooth material from the ravages of dental decay. New clinical techniques have been devised to exploit the unique characteristics of the material (McLean Wilson, 1977a,b,c Wilson McLean, 1988 Mount, 1990). 

Clinical experience shows that these cements are durable. For example, a failure rate as low as 2 % has been reported by Mount (1984) in a clinical trial lasting seven years, and Wilson McLean (1988) have cited a number of clinical trials attesting to the durability of this cement. 

The glass-ionomer cement is the most versatile of all the dental cements and has been developed for a variety of applications (McLean Wilson, 1974, 1977a,b,c Swift, 1988b van de Voorde, 1988 Wilson McLean, 1988 Mount, 1990). Many of its applications depend on its adhesive quality which means that, unlike the non-adhesive traditional filling materials, it does not require the preparation of mechanical undercuts for retention and the consequent loss of sound tooth material. 

J. Kawaguchi, V. Wilson, P.J. Mee, Visualization of whole-mount skeletal expression patterns of LacZ reporters using a tissue clearing protocol. Biotechniques 32 (2002) 68-73. 

Refs. [i] Ryan TH (ed) (1984) Electrochemical detectors. Fundamental aspects and analytical applications. Plenum Press New York [ii] Vdha f (1982) Gas and liquid analyzers. In Svehla G (ed) Wilson and Wilsons comprehensive analytical chemistry, vol. XVII. Elsevier, Amsterdam [iii] Mount AR (2003) Hydrodynamic electrodes. In Bard A, Strat-mann M, Unwin P (eds) Instrumentation and electroanalytical chemistry. Encyclopedia of electrochemistry, vol 3. Wiley-VCH, Weinheim, pp 134... 

The Arcturus Formation is structurally over-lain by felsic volcanic rocks and volcaniclastic sedimentary rocks (Passaford and Lower Shamva formations) and intercalated graphitic argillites (Mount Hampden Formation). Tuffaceous rocks and volcanic breccias occur in close association with porphyry stocks. All are andesitic to dacitic in composition. Associated epiclastic sedimentary rocks are poorly sorted massive, structureless and planar-bedded deposits. Clasts are felsic in composition and include crystal tuff, porphyry and chert, suggesting a very localized provenance. This felsic volcanism has been dated at 2643 8 Ma (Figs 2a and 3g, Wilson et al. 1995) and is associated with the emplacement of late-tectonic... 

True random orientation mounts are difficult to prepare, and numerous techniques for filling powder sample holders have been described (Brindley and Brown, 1980). For example, powder samples have been embedded in plastic (Brindley and Kurtossy, 1961), polyester foam (Thompson et al., 1972), mixed with powdered cork (Wilson, 1987), pasted in acetone prior to smearing onto glass slides (Paterson et al., 1986) and spray dried (Hillier, 2002). 

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