Shipbuilding industry is of great importance in the national manufacturing sector.Like the aircraft and automobile industries,it is also the systematic integration of materials,machinery,electric,light,and instruments...Shipbuilding industry is of great importance in the national manufacturing sector.Like the aircraft and automobile industries,it is also the systematic integration of materials,machinery,electric,light,and instruments manufacturing,combined with software and computer applications.Shipbuilding industry comprehensively reflects the technical and innovation ability of each subdivision of manufacturing industry.展开更多
1 Rare earth export In 2019,China totally exported 46,300 tons of rare earth in amount down 12.64%,and US$440 million in value,down 14.44%year-onyear(YoY).The average price of exported rare earth was US$9.5 per kilogr...1 Rare earth export In 2019,China totally exported 46,300 tons of rare earth in amount down 12.64%,and US$440 million in value,down 14.44%year-onyear(YoY).The average price of exported rare earth was US$9.5 per kilogram,fell by 2.06%Yo Y.In the total export,rare earth compounds takes the majority proportion with 39,500 tons,down 13.51%from the previous year,accounting for 85.31%,but its export value was US$440 million in value,down only 10.76%,that is to say,the average price increased by 3.17%YoY.展开更多
What is the post-WTO era?China became one member of WTO on 10 November 2001,followed by five years'transitional period.Post-WTO era should start from 2007 after the transition period.China began to issue mandatory...What is the post-WTO era?China became one member of WTO on 10 November 2001,followed by five years'transitional period.Post-WTO era should start from 2007 after the transition period.China began to issue mandatory production quotas on RE mineral products since 2006 and on RE smelting products since 2007,which was right in the era of the post-WTO.RE demand and supply situation in the post-WTO era is analyzed in this paper,based on current status quo of China's RE industry and展开更多
The nano powders of LaCrO3 were prepared by a sol-gel route. The heat capacity of LaCrO3 nano powders from 350 to 550 K was measured by DSC method and expressed as： Cpa2CrO3） （±0.112） = 166.844 - 8.500 ×...The nano powders of LaCrO3 were prepared by a sol-gel route. The heat capacity of LaCrO3 nano powders from 350 to 550 K was measured by DSC method and expressed as： Cpa2CrO3） （±0.112） = 166.844 - 8.500 ×10^-3T- 1.022×10^6T^-2 （J/（mol.K）） （350-550 K）. An EMF measurement assembly was developed with CaF2 as an electrolyte for the galvanic cell. From measured EMF data of the reversible cell, （-） PL La2O3, LaF3, O2 （1 atm）lCaF2O2（1 atm）, LaF3, LaCrO3, Cr2O3, Pt（＋）, and the relevant value of Gibbs free energy, the Gibbs free energy of formation of LaCrO3 was calculated from 700 to 885 K： △G ФaLaCrO3 = -1555.364 ＋ 0.354T （kJ/mol） （700-885 K）. And the Gibbs free energy change of reaction from simple oxides La2O3 and Cr2O3 was calculated to be： AG f Oox（LaCrO3） = -94.758 ＋ 8.530×10^-2T（kJ/mol） （700-885 K）.展开更多
The 2nd International Conference on Rare Earth Development and Applications(ICRE’91),which wassponsored by the Chinese Society of Rare Earths,was held at Beijing International Convention Centre fromMay 27 through May...The 2nd International Conference on Rare Earth Development and Applications(ICRE’91),which wassponsored by the Chinese Society of Rare Earths,was held at Beijing International Convention Centre fromMay 27 through May 31,1991.290 scientists attended this conference,among them there were 63 foreign sci-entists.Prof.Yu Zongsen,vice-chairman of the Chinese Society of Rare Earths,presided over the openingceremony.Mr.Xu Daquan,deputy director of the Rare Earth Leading Group of the State Council,vice-minister展开更多
"Substitution"is a frequently mentioned word in rare earth industry in recent years.Substitution of rare earth materials by others materials or replacement of other technologies by rare earth application tec..."Substitution"is a frequently mentioned word in rare earth industry in recent years.Substitution of rare earth materials by others materials or replacement of other technologies by rare earth application technology is highly discussed.Substitution phenomena and corresponding effects will be analyzed in the article.1.Development of engineering technology is a history of technology innovation and advancement,as well as the substitution history of old technology,material or product with novel ones From the development history of civilization of human beings,the substitution had started more than展开更多
It is known to all that China is abundant in rare earth resources. But rare earth deposits are really not that rare in the earth crest. In the five continents, i.e. Asia, Europe, Australia, North and South America, an...It is known to all that China is abundant in rare earth resources. But rare earth deposits are really not that rare in the earth crest. In the five continents, i.e. Asia, Europe, Australia, North and South America, and Africa, there are about thirty four countries found to have rare earth deposits; Brazil might surpass China and rank the first in rare earth deposits. At present, investment in rare earth production was surged, there have been about 200 projects, and the total production for 25 of them would be more than 170 thousand tons after 2015, a multi-supply system on rare earths is being established worldwide. Cautions on the investment of rare earth production are involved.展开更多
文摘Shipbuilding industry is of great importance in the national manufacturing sector.Like the aircraft and automobile industries,it is also the systematic integration of materials,machinery,electric,light,and instruments manufacturing,combined with software and computer applications.Shipbuilding industry comprehensively reflects the technical and innovation ability of each subdivision of manufacturing industry.
文摘1 Rare earth export In 2019,China totally exported 46,300 tons of rare earth in amount down 12.64%,and US$440 million in value,down 14.44%year-onyear(YoY).The average price of exported rare earth was US$9.5 per kilogram,fell by 2.06%Yo Y.In the total export,rare earth compounds takes the majority proportion with 39,500 tons,down 13.51%from the previous year,accounting for 85.31%,but its export value was US$440 million in value,down only 10.76%,that is to say,the average price increased by 3.17%YoY.
文摘What is the post-WTO era?China became one member of WTO on 10 November 2001,followed by five years'transitional period.Post-WTO era should start from 2007 after the transition period.China began to issue mandatory production quotas on RE mineral products since 2006 and on RE smelting products since 2007,which was right in the era of the post-WTO.RE demand and supply situation in the post-WTO era is analyzed in this paper,based on current status quo of China's RE industry and
基金This project is financially supported by the National Natural Science Foundation of China (Nos. 50374009, 20331030, and 20571009)
文摘The nano powders of LaCrO3 were prepared by a sol-gel route. The heat capacity of LaCrO3 nano powders from 350 to 550 K was measured by DSC method and expressed as： Cpa2CrO3） （±0.112） = 166.844 - 8.500 ×10^-3T- 1.022×10^6T^-2 （J/（mol.K）） （350-550 K）. An EMF measurement assembly was developed with CaF2 as an electrolyte for the galvanic cell. From measured EMF data of the reversible cell, （-） PL La2O3, LaF3, O2 （1 atm）lCaF2O2（1 atm）, LaF3, LaCrO3, Cr2O3, Pt（＋）, and the relevant value of Gibbs free energy, the Gibbs free energy of formation of LaCrO3 was calculated from 700 to 885 K： △G ФaLaCrO3 = -1555.364 ＋ 0.354T （kJ/mol） （700-885 K）. And the Gibbs free energy change of reaction from simple oxides La2O3 and Cr2O3 was calculated to be： AG f Oox（LaCrO3） = -94.758 ＋ 8.530×10^-2T（kJ/mol） （700-885 K）.
文摘The 2nd International Conference on Rare Earth Development and Applications(ICRE’91),which wassponsored by the Chinese Society of Rare Earths,was held at Beijing International Convention Centre fromMay 27 through May 31,1991.290 scientists attended this conference,among them there were 63 foreign sci-entists.Prof.Yu Zongsen,vice-chairman of the Chinese Society of Rare Earths,presided over the openingceremony.Mr.Xu Daquan,deputy director of the Rare Earth Leading Group of the State Council,vice-minister
文摘"Substitution"is a frequently mentioned word in rare earth industry in recent years.Substitution of rare earth materials by others materials or replacement of other technologies by rare earth application technology is highly discussed.Substitution phenomena and corresponding effects will be analyzed in the article.1.Development of engineering technology is a history of technology innovation and advancement,as well as the substitution history of old technology,material or product with novel ones From the development history of civilization of human beings,the substitution had started more than
文摘It is known to all that China is abundant in rare earth resources. But rare earth deposits are really not that rare in the earth crest. In the five continents, i.e. Asia, Europe, Australia, North and South America, and Africa, there are about thirty four countries found to have rare earth deposits; Brazil might surpass China and rank the first in rare earth deposits. At present, investment in rare earth production was surged, there have been about 200 projects, and the total production for 25 of them would be more than 170 thousand tons after 2015, a multi-supply system on rare earths is being established worldwide. Cautions on the investment of rare earth production are involved.
