Desert sand

Kormann, C., D. W. Bahnemann, and M. R. Hoffmann (1988), "Photocatalytic Production of H202 and Organic Peroxides in Aqueous Suspensions of Ti02, ZnO, and Desert Sand", Environ. Sci. Technol. 22, 798-806. 

Soils with greater amounts of organic matter (agricultural or forest soils) or minerals (compared to desert sand) will sorb greater landmine signature chemicals,6 leaving less available for transfer to the air for vapor sensing. 

Similar reactions have been observed more recently on a variety of solids, including ZnO, TiOz, and desert sand in the presence of organics, organic peroxides have also been observed (e.g., see Kormann et al., 1988). For a review of this area, the reader is referred to the review by Hoffmann et al. (1995). 

About the same time that meteorites were found in Antarctica, an important collection of meteorites was being put together in Roosevelt County, New Mexico. Over a period from 1966 to 1972, several meteorite hunters collected 140 meteorite specimens representing about 100 separate fall events. This collection demonstrated another way for nature to concentrate meteorites. The meteorites in Roosevelt County were found in blowout areas where up to a meter of soil had been blown away by wind, leaving meteorites in plain view on the hardpan surface. Based on this experience, systematic and successful searches of desert areas in Western Australia have been carried out. Subsequently, the deserts of North Africa have turned out to be especially prolific sources of meteorites. The shifting desert sands expose meteorites that have accumulated over thousands of years. The meteorites are collected by nomads and sold to western collectors. Although most desert meteorites are weathered to some degree, new and rare meteorite classes have been discovered. 

The window chambers designed for the hamster, the diabetic desert Sand Rat (.Psammomys obesus), and the mouse consist of two titanium alloy frames, each having a 12 mm diameter circular opening fitted with a ring for attachment of the window or sensor array (Figure 4.3). The standard chamber plates for the mouse have the same size opening but are approximately 50% smaller in surface area. However, as... 

The reactions observed in the photochemical smog, especially those concerning decomposition and oxidation of volatile organic substances, are accelerated by atmospheric aerosols, eg oxidation of some halogenated hydrocarbons, isoprene, monoterpenes, and aromatic hydrocarbons is enhanced by the surfaces of metal oxides, desert sand, volcanic ash, and sea salt [8],... 

A. P. Bahnemann, D. W. Hoffmann, M. R.. T. Phvs. Chem. accepted for publication 12/12/86). These particles have a mean diameter of 30 nm with 30% of the surface area covered with Co(II)TSP. Desert sand obtained from Death Valley has been treated with several acid washing cycles and selected by size and weight (Kormann, C. Bahnemann, D. W. Hoffmann, M. R. unpublished data). The H202 concentration was measured continuously with a YSI-Clark 2510 Oxidase Probe connected to a YSI model 25 oxidase meter. The surface of the electrode was covered with a dialysis membrane (molecular weight cutoff 12,000 - 14,000) to prevent any... 

Figure 4. Formation and depletion of H202 upon illumination and in the dark observed in an aerated aqueous suspension of Death Valley desert sand (other exp. cond. are given in the figure).

Entisol Nonsense syllable ent, from recent Negligible differentiation of horizons in alluvium, frozen ground, desert sand, and so on, in all climates... 

Figure 12. Marshall stability vs. compaction temperature-desert sand...

Table IV. Properties of Desert Sand Paving Materials...

Figure 13. Voids content vs. compaction temperature—desert sand...

Traditionally, the best gum was produced by hand-picking clear tears of gum. This grade is still available but the price reflects the cost of the hand-picking. As the gum is produced by removing the tears from the gum trees some gum is contaminated with pieces of bark. Because of this the gum can pick up colour and astringent tastes from the bark. Also, raw gum is often contaminated with desert sand. 

Several interesting papers have appeared that involve somewhat unconventional heterogeneous photosystems. Thus, the photo-oxidation of water to O2 is said to occur with AgCl colloids whilst others have found that Agl is capable of the photofixation of N2. Nitrogen reduction has been reported to occur with multifarious mixed oxides and with desert sands. In fact, if all... 

Hattori Y., Suzuki K., Honda M., and Shimizu H. (2003) Re-Os isotope systematics of the Taklimakan Desert sands, moraines and river sediments around the Taklimakan Desert, and of Tibetan soils. Geochim. Cosmochim. Acta 67, 1195-1206. 

The United States first tested its nuclear bomb capabilities in a desert-region of New Mexico on July 16, 1945. When the atomic bomb was detonated, a huge crater formed. The heat from the plutonium-based bomb melted the desert sands, which then solidified, forming a glassy residue. The resulting mineral (pictured here) was named trinitite after the site (named Trinity) of the test. IMAGE COPYRIGHT 2009, STEVE SHOUP. USED UNDER LICENSE FROM SHUTTERSTOCK.COM,... 

Benzoni L, Garbassi F (1984) Reactivity of fluorochloromethanes with desert sands. Ber Bunsen Phys Chem 88 379-382... 

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