Results 261 to 270 of about 726,846 (313)
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1963
Although silica is the commonest constituent of the earth’s crust, the study of it and its compounds baffled investigators for many decades. There are several reasons for this. Firstly, silicates are almost all insoluble in anything except hydrofluoric acid, so that they cannot be separated or investigated by solution methods.
Felix Singer, Sonja S. Singer
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Although silica is the commonest constituent of the earth’s crust, the study of it and its compounds baffled investigators for many decades. There are several reasons for this. Firstly, silicates are almost all insoluble in anything except hydrofluoric acid, so that they cannot be separated or investigated by solution methods.
Felix Singer, Sonja S. Singer
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2014
A worldwide rise in demand for forest products in 2013 resulted in the highest timber harvest in the UNECE region since 2007.
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A worldwide rise in demand for forest products in 2013 resulted in the highest timber harvest in the UNECE region since 2007.
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Ceramic raw materials: how to establish the technological suitability of a raw material
Archaeological and Anthropological Sciences, 2020The aim of this paper is to highlight the importance of raw materials in the production of ceramic artefacts. A brief but in-depth explanation is provided to emphasise the connections between raw materials and ceramic products. A step by step approach is developed with the aim of illustrating the different ceramic raw materials and their features and ...
Gualtieri, Sabrina
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1992
Most of the spectacular landscapes of England and Wales are found within the rugged, higher lands of the north, west and south-west. Why is there such a striking difference between the areas of mountains and moorlands, and the gently undulating lowlands characteristic of the south and east?
Rita Gardner, Andrew Goudie
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Most of the spectacular landscapes of England and Wales are found within the rugged, higher lands of the north, west and south-west. Why is there such a striking difference between the areas of mountains and moorlands, and the gently undulating lowlands characteristic of the south and east?
Rita Gardner, Andrew Goudie
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The Raw Material of Radio [PDF]
Hollywood Quarterly, 1947 "Official Communique of the Winning Team: Today we won the World Series War, inflicting a crushing defeat on the enemy. The battle was a slaughter. By daring sorties into the enemy's territory, our heroic men succeeded in capturing eleven runs and bringing them all back safely. Not a run was captured by the enemy, and only one of their men succeeded in
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, 2002 This chapter is mostly about pottery. Pottery is only one of the large number of products known as ceramics. Other ceramics are covered briefly. Although pottery is composed of predominantly crystalline phases, glass (including glaze) is not. Glasses (including obsidian) are formed from the solidification of molten silicate — solidification that took ...
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2004
The raw materials used in the formation of chemically bonded phosphate ceramics (CBPCs) are identified. Phosphoric acid and its acid phosphates are the major components. An overview of the extraction chemistry of phosphoric acid from apatite rocks is given and the candidate acid phosphates are identified.
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The raw materials used in the formation of chemically bonded phosphate ceramics (CBPCs) are identified. Phosphoric acid and its acid phosphates are the major components. An overview of the extraction chemistry of phosphoric acid from apatite rocks is given and the candidate acid phosphates are identified.
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, 1995 Preserved fish is presented to the consumer in many forms, but no matter which form the consumer purchases, the quality of the end-product will reflect the quality of the raw material used in its preparation. Like any other food product it is impossible to produce a premium-quality canned fish product using second-rate raw materials.
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2009
: To ensure that raw materials have a uniformly high quality for subsequent processing or for sale in the fresh market sector, it is necessary to cool them to reduce metabolic activity and microbial growth, to remove contaminants, and to sort foods to produce uniform characteristics.
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: To ensure that raw materials have a uniformly high quality for subsequent processing or for sale in the fresh market sector, it is necessary to cool them to reduce metabolic activity and microbial growth, to remove contaminants, and to sort foods to produce uniform characteristics.
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1979
Clearly, the resources of Planet Earth are finite. But, equally clearly, the actual amount of raw materials distributed through the Earth’s crust — let alone its interior — is vastly more than mankind could possibly use in a millennium, let alone a mere century or so.
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Clearly, the resources of Planet Earth are finite. But, equally clearly, the actual amount of raw materials distributed through the Earth’s crust — let alone its interior — is vastly more than mankind could possibly use in a millennium, let alone a mere century or so.
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