Civil science and technology associations have been widely springing up everywhere in Britain, especially the new industrial towns in the eighteenth and nineteenth centuries. Associations held various academic activit...Civil science and technology associations have been widely springing up everywhere in Britain, especially the new industrial towns in the eighteenth and nineteenth centuries. Associations held various academic activities, organized and funded scientific research, which played an important role in promoting the progress of science and technology and the development of industrial society. Based on case study on British Association for the Advancement of Science and Manchester Literary and Philosophical Society by academic circles at home and abroad, development situation of British science and technology associations in the middle and late 19^(th) century is summarized, and a series of activities of associations participating in industrial and agricultural development and environmental health reform are systematically sorted out, while the promoting role of science and technology associations in the social development of Britain in the 19^(th) century is explored.展开更多
Bailiwick of Jersey is a British Crown dependency,with independent government,postal service,police,etc.,and convenient transportation to and from Britain.The Chinese New Year celebration was organized by government o...Bailiwick of Jersey is a British Crown dependency,with independent government,postal service,police,etc.,and convenient transportation to and from Britain.The Chinese New Year celebration was organized by government of Bailiwick of Jersey for the first time,which helped to promote Chinese New Year celebrations in the area.展开更多
The present study aims to further understanding of the principal reactions that occur during coal oxidation at moderate temperatures. Mass change and heat evolution of a sample were monitored by thermo-gravimetric ana...The present study aims to further understanding of the principal reactions that occur during coal oxidation at moderate temperatures. Mass change and heat evolution of a sample were monitored by thermo-gravimetric analysis coupled with differential thermal analysis (TGA/DTA). Gaseous and solid products were traced using online or in situ Fourier trans- form infrared spectroscopy (FTIR). Measurements were conducted by heating the samples up to 400?C, with the O2 concentration in the reaction medium set at 0, 10, 21, and 40 vol%, respectively. It was observed that the mass increase of a sample between 150?C and ~275oC was a result of the accumulation of C=O containing species in the coal structure, whereas substantial mass loss and heat evolution of a sample at ~400oC can be attributed to the significant involvement of the direct “burn-off” reaction. Enrichment of O2 inthe reaction medium leads to the acceleration in oxygen chemi- sorption, formation and decomposition of the solid oxygenated complexes, as well as the “burn-off” reaction. With the temperature increasing, the oxidation process governed by oxygen chemisorption gradually shifts to that by significant decomposition reactions, and eventually to that by the direct “burn-off” reaction. Temperature boundaries of these stages can be determined using parameters defined based on a set of TG/DTA data. Shift in the governing reactions is essentially due to the diverse requirements of reactants of the reactions and their energy barriers to be overcome. In en- gineering practice, the phenomena of self-heating and spontaneous combustion of coal correspond to chemisorption and the direct “burn-off” reaction, respectively.展开更多
文摘Civil science and technology associations have been widely springing up everywhere in Britain, especially the new industrial towns in the eighteenth and nineteenth centuries. Associations held various academic activities, organized and funded scientific research, which played an important role in promoting the progress of science and technology and the development of industrial society. Based on case study on British Association for the Advancement of Science and Manchester Literary and Philosophical Society by academic circles at home and abroad, development situation of British science and technology associations in the middle and late 19^(th) century is summarized, and a series of activities of associations participating in industrial and agricultural development and environmental health reform are systematically sorted out, while the promoting role of science and technology associations in the social development of Britain in the 19^(th) century is explored.
文摘Bailiwick of Jersey is a British Crown dependency,with independent government,postal service,police,etc.,and convenient transportation to and from Britain.The Chinese New Year celebration was organized by government of Bailiwick of Jersey for the first time,which helped to promote Chinese New Year celebrations in the area.
文摘The present study aims to further understanding of the principal reactions that occur during coal oxidation at moderate temperatures. Mass change and heat evolution of a sample were monitored by thermo-gravimetric analysis coupled with differential thermal analysis (TGA/DTA). Gaseous and solid products were traced using online or in situ Fourier trans- form infrared spectroscopy (FTIR). Measurements were conducted by heating the samples up to 400?C, with the O2 concentration in the reaction medium set at 0, 10, 21, and 40 vol%, respectively. It was observed that the mass increase of a sample between 150?C and ~275oC was a result of the accumulation of C=O containing species in the coal structure, whereas substantial mass loss and heat evolution of a sample at ~400oC can be attributed to the significant involvement of the direct “burn-off” reaction. Enrichment of O2 inthe reaction medium leads to the acceleration in oxygen chemi- sorption, formation and decomposition of the solid oxygenated complexes, as well as the “burn-off” reaction. With the temperature increasing, the oxidation process governed by oxygen chemisorption gradually shifts to that by significant decomposition reactions, and eventually to that by the direct “burn-off” reaction. Temperature boundaries of these stages can be determined using parameters defined based on a set of TG/DTA data. Shift in the governing reactions is essentially due to the diverse requirements of reactants of the reactions and their energy barriers to be overcome. In en- gineering practice, the phenomena of self-heating and spontaneous combustion of coal correspond to chemisorption and the direct “burn-off” reaction, respectively.
