Nature and occurrence

The floatability of gold from gold-containing copper gold ores depends on the nature and occurrence of gold in these ores, and its association with iron sulphides. 

In general, the flotation properties of PGM from sulphide-dominated deposits are very dependent on the ratio of the individual sulphide minerals present in the ore and the nature and occurrence of hydrophobic gangue minerals present in the ore. 

It is not practical here, of course, to attempt to list all the chemicals that can be found in the workplace, far less to describe their effects and toxicity. The list, of course, will vary according to the nature of the work. The chemicals found in paint manufacturing, for instance, will be different from those occurring in a foundry. The nature and occurrence of some of the more common of these industrial chemicals, along with their toxic effects, is examined in Chapter 7. 

The American National Standards Institute (ANSI) has established a voluntary consensus standard for recording basic facts relating to the nature and occurrence of work injuries, ANSI Z16.2.( ) This standard has been in use for more than 30 years and provides a consistent baseline for many report formats. The standard focuses on injury to personnel and presents standard classification categories. If alternate codes are used in incident reports, special effort and notation must be made to avoid confusing the reader. 

Facts Relating to the Nature and Occurrence of Work Injurks. New York. 

American National Standards Institute. ANSI Z16.2 Method of Recording Basic Facts Relating to the Nature and Occurrence of Work Injuries. New York. 

There have been tremendous strides made recently towards understanding how volatiles in general and water in particular is transported and stored in the mantle. This progress is based on research on a number of fronts studies of mantle-derived samples have provided insight into the nature and occurrence of hydrous phases such as amphibole, mica, and chlorite, and have provided constraints on the capacity of nominally anhydrous minerals (NAMs) such as olivine, pyroxenes, and garnet to contain water by a variety of substimtion mechanisms. Experimental studies on mantle-derived magmas have provided constraints on volatile contents in their source regions. Other studies have constrained the pressure, temperature, and composition conditions over which hydrous phases are stable in the mantle. 

Miller, S. L. (1974). The Nature and Occurrence of Clathrate Hydrates. In Natural Gases in Marine Sediments (I. R. Kaplan, Ed.). Plenum Press, New York. 

Summerfield, M.A. (1981) The Nature and Occurrence of Silcrete, Southern Cape Province, South Africa. School of Geography Research Paper 28, University of Oxford. 

Watts, S.H. (1978a) The nature and occurrence of silcrete in the Tibooburra area of northwestern New South Wales. In Langford-Smith, T. (Ed.) Silcrete in Australia. Armidale University of New England Press, pp. 167-85. 

These conclusions will be examined critically, in view of our recent findings concerning the nature and occurrence of the hydrogen-oxide bridging ligand. 

This book provides an introduction to the nature and occurrence, properties and uses, and formation and breaking of foams in the petroleum industry. It is aimed at scientists and engineers who may encounter foams or apply foams, whether in process design, petroleum production, or research and development. Primarily the focus is on the introduction and subsequent application of foam principles, and includes attention to practical foam problems. Books available up to now are either principally theoretical (such as the colloid chemistry texts) or focus on foams in general (like Bikerman s classic books). A significant gap in this coverage concerns foams in the petroleum industry, a topic that is not only of great practical importance but also presents many problems of fundamental interest. 

Tullo, Alexander H. Methane on Ice. Chemical En neering News 83 (August 22, 2005) 16-17. This brief article describes the nature and occurrence of methane hydrate crystals and the prospects of their use as a future source of fuel. 

Nevertheless, during this 25-year period there have continued to emerge a significant number of breakthroughs. In the next section 1 propose to analyze their nature and occurrence, excluding pharmaceuticals and specialty chemicals. 

Of the 15 variations of incident investigation reports received, six promote an overly simplistic and inappropriate approach to causal factor determination. They reflect this instmction, although somewhat ancient, given in a publication of the American National Standards Institute, the Method of Recording Basic Facts Relating to the Nature and Occurrence of Work Injuries—Z16.2. 

Hydrogen bonding D BRIGGS Nature and occurrence of hydrogen bonding, work of adhesion, examples where important... 

The subsequent reports of Lyall (1937), Chamberlin (1939), and Dick and Hurst (1942) provided further insight into the nature and occurrence of these lower esophageal lesions. The further substantial contributions by Paul Allison and Johnstone of Leeds (1943, 1946, and 1948) left little doubt that the authors were confident in their ability to recognize and diagnose peptic ulcer of the esophagus or esophagitis. ... 

Svendsen et al. (2014) Norway Describe the nature and occurrence of non-fatal injuries in farmers in two counties in Norway Farming Non-fatal... 

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