Gaseous detonation propagating in a toroidal chamber was numerically studied for hydrogen/oxygen/nitrogen mixtures. The numerical method used is based on the three-dimensional Euler equations with detailed finiterate ...Gaseous detonation propagating in a toroidal chamber was numerically studied for hydrogen/oxygen/nitrogen mixtures. The numerical method used is based on the three-dimensional Euler equations with detailed finiterate chemistry. The results show that the calculated streak picture is in qualitative agreement with the picture recorded by a high speed streak camera from published literature. The three-dimensional flow field induced by a continuously rotating detonation was visualized and distinctive features of the rotating detonations were clearly depicted. Owing to the unconfined character of detonation wavelet, a deficit of detonation parameters was observed. Due to the effects of wall geometries, the strength of the outside detonation front is stronger than that of the inside portion. The detonation thus propagates with a constant circular velocity. Numerical simulation also shows three-dimensional rotating detonation structures, which display specific feature of the detonation- shock combined wave. Discrete burning gas pockets are formed due to instability of the discontinuity. It is believed that the present study could give an insight into the interest- ing properties of the continuously rotating detonation, and is thus beneficial to the design of continuous detonation propulsion systems.展开更多
Three Complexes of the formula [Cd (4,4'-bpy)_2 (H_2O)_2]_n. (pic)_(2n) (1) [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n(H_2O)_n (pic)-(2n) (2) and [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n (pic)-(2n)(H_...Three Complexes of the formula [Cd (4,4'-bpy)_2 (H_2O)_2]_n. (pic)_(2n) (1) [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n(H_2O)_n (pic)-(2n) (2) and [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n (pic)-(2n)(H_2O)_n (3) (4.4'-bpy = 4.4'-bipyridine. pic = picric anion ) have been synthesized and characterized by elemental analysis and single-crystal x-ray diffraction. They all have infinite three-dimensional network structure. crystallizing in the monoclinic space group C2/c (1) and Cc (2.3).展开更多
3 - dimensional body measurement technology, the basis of developing high technology in industry, accelerates digital development of aplparel industry. This paper briefly introduces the history of 3 - dimensional body...3 - dimensional body measurement technology, the basis of developing high technology in industry, accelerates digital development of aplparel industry. This paper briefly introduces the history of 3 - dimensional body measurement technology, and recounts the principle and primary structure of some types of 3 - dimensional automatic body measurement system. With this understanding, it discusses prospect of 3- dimensional CAD and virtual technology used in apparel industry.展开更多
Shot peening is a widely used surface treatment method by generating compressive residual stress near the surface of metallic materials to increase fatigue life and re- sistance to corrosion fatigue, cracking, etc. Co...Shot peening is a widely used surface treatment method by generating compressive residual stress near the surface of metallic materials to increase fatigue life and re- sistance to corrosion fatigue, cracking, etc. Compressive re- sidual stress and dent profile are important factors to eval- uate the effectiveness of shot peening process. In this pa- per, the influence of dimensionless parameters on maximum compressive residual stress and maximum depth of the dent were investigated. Firstly, dimensionless relations of pro- cessing parameters that affect the maximum compressive residual stress and the maximum depth of the dent were de- duced by dimensional analysis method. Secondly, the in- fluence of each dimensionless parameter on dimensionless variables was investigated by the finite element method. Fur- thermore, related empirical formulas were given for each di- mensionless parameter based on the simulation results. Fi- nally, comparison was made and good agreement was found between the simulation results and the empirical formula, which shows that a useful approach is provided in this pa- per for analyzing the influence of each individual parameter.展开更多
Based on our previously pulse-coupled integrate-and-fire neuron model in small world networks, we investigate the effects of different connectivity topologies on complex behavior of electroencephalographic-like signal...Based on our previously pulse-coupled integrate-and-fire neuron model in small world networks, we investigate the effects of different connectivity topologies on complex behavior of electroencephalographic-like signals produced by this model. We show that several times series analysis methods that are often used for analyzing complex behavior of electroencephalographic-like signals, such as reconstruction of the phase space, correlation dimension, fractal dimension, and the Hurst exponent within the rescaled range analysis （R/S）. We lind that the different connectivity topologies lead to different dynamical behaviors in models of integrate-and-fire neurons.展开更多
With the trust and support by WFO and its members,Foundry Institution of Chinese Mechanical Engineering Society (FICMES) will host the 69th World Foundry Congress (WFC2010). We cordially invite you to participate ... With the trust and support by WFO and its members,Foundry Institution of Chinese Mechanical Engineering Society (FICMES) will host the 69th World Foundry Congress (WFC2010). We cordially invite you to participate in the 69th WFC to be held on October 16-20,2010,in Hangzhou,China.……展开更多
)The 2008 IEEE World Congress on Computational Intelligence (WCCI 2008) will be held at the HongKong Convention and Exhibition Centre during June 1-6, 2008. WCCI 2008 will be the fifth milestone inthis series with a g...)The 2008 IEEE World Congress on Computational Intelligence (WCCI 2008) will be held at the HongKong Convention and Exhibition Centre during June 1-6, 2008. WCCI 2008 will be the fifth milestone inthis series with a glorious history from WCCI 1994 in Orlando, WCCI 1998 in Anchorage, WCCI 2002in Honolulu, to WCCI 2006 in Vancouver. Sponsored by the IEEE Computational Intelligence Society,展开更多
More than 20000 representatives and tourists from 170 countries and regions participated in the World Festival of International. Youth which opened on July 1 in Pyongyang.
On January 4, United States planes shot down two Libyan jet fighters over the Mediterranean Sea. This is the first fighting between the US and Libya since US jets bombed Tripoli in 1986. But on January 12, the United ...On January 4, United States planes shot down two Libyan jet fighters over the Mediterranean Sea. This is the first fighting between the US and Libya since US jets bombed Tripoli in 1986. But on January 12, the United States, Britain and France, in a rare triple veto, blocked a Security Council resolution to deplore the shooting down of two Libyan jets by US navy fighters. President Fidel Castro of Cuba announced on January 4 in Havana that the first 3000 Cuban troops to be withdrawn from展开更多
The European Union summit ended on December 16 in Madrid. European leaders set their seal on a drive to make Europe a global power ready for challenges of the next century with a new currency and a new list of members...The European Union summit ended on December 16 in Madrid. European leaders set their seal on a drive to make Europe a global power ready for challenges of the next century with a new currency and a new list of members. The US federal government partially shut down for the second time in a month on December 16, with President Bill展开更多
Organizer,date and venueThe Second World Conference on Digestology will beheld in the Beijing International Convention Center,Beijing,China on September 8-11,2000 by World Journal ofGastroenterology and World Chinese ...Organizer,date and venueThe Second World Conference on Digestology will beheld in the Beijing International Convention Center,Beijing,China on September 8-11,2000 by World Journal ofGastroenterology and World Chinese Journal of Digestologyand the Committee of World Digestology Network(http://www.wd.org.cn).About 2000 participants are expected toattend the meeting.展开更多
Organizer,date and venueThe Second World Conference on Digestology will beheld in the Beijing International Convention Center,Beijing,China on September 8-11,2000 by World Journal ofGastroenterology and World Chinese ...Organizer,date and venueThe Second World Conference on Digestology will beheld in the Beijing International Convention Center,Beijing,China on September 8-11,2000 by World Journal ofGastroenterology and World Chinese Journal of Digestologyand the Committee of World Digestology Network (http://www.wd.org.cn).About 2000 participants are expected toattend the meeting.展开更多
The World Journal of Gastroenterology Editorial Board consists of 685members,representing a team of worldwide experts in gastroenterologyand hepatology.They are from 52 countries including:Albania(1),Argentina(1),Aust...The World Journal of Gastroenterology Editorial Board consists of 685members,representing a team of worldwide experts in gastroenterologyand hepatology.They are from 52 countries including:Albania(1),Argentina(1),Australia(16).Austria(7),Belarus(1),Belgium(11),Brazil(1),Bulgaria(1),Canada(10),China(58),Croatia(2),Czech(1),Denmark(5),Egypt(3),Finland(1),France(27).Germany(71),Greece(1),Hungary(1).Iceland(1),India(6),Iran(2),Ireland(2),Israel(5),Italy(51),Japan(137),Lebanon(2),Lithuania(1),Macedonia(1),Malaysia(3),Mexico(2),Monaco(1),Netherlands(15),New Zealand(1),Nigeria(1),Norway(2),Pakistan(1),Poland(6),Portugal(1),Russia(3),Singapore(3),Slovakia(1),South Africa(1),South Korea(9),Spain(27),Sweden(6),Switzerland(8),Turkey(7),United Arab Emirates(1),United Kingdom(37).United States(121),Yugoslavia(1).展开更多
Russian President Boris Yeltsin, after an emphatic election victory, made a plea on July 4 for national reconciliation. With over 99 per cent of the vote counted, Yeltsin had 53. 70 per cent to Zyuganov’s 40.41 per c...Russian President Boris Yeltsin, after an emphatic election victory, made a plea on July 4 for national reconciliation. With over 99 per cent of the vote counted, Yeltsin had 53. 70 per cent to Zyuganov’s 40.41 per cent. The 65-year-old persident’s victory will return him to展开更多
Struggling to rebuild a mission near collapse,the UN Security Council voted on June 16 toenlarge its force in Bosnia to include up to12500 heavily armed troops.
On August 5, US President Bill Clinton signed into law a bill to punish foreign companies that invest in oil and gas projects in Iran or Libya. The law, which sparked vehement protests from European countries, was des...On August 5, US President Bill Clinton signed into law a bill to punish foreign companies that invest in oil and gas projects in Iran or Libya. The law, which sparked vehement protests from European countries, was designed to discourage investment in Iran and Libya. On August 14, Iran’s Parliament Speaker Ali Akbar Nateq-nouri vowed to take stance against US domination展开更多
On June 2, US President Bill Clinton renewedthe Most-Favoured Nation trade status for Chinafor another year on the recommendation of USSecretary of State Warren Christopher.
Retired senior Chinese leader Chen Yun died atage 90 of an illness at 14:04 on April 10 inBeijing. An Organization of African Unity missionarrived in Burundi on April 12, seeking topromote reconciliatton in a nation r...Retired senior Chinese leader Chen Yun died atage 90 of an illness at 14:04 on April 10 inBeijing. An Organization of African Unity missionarrived in Burundi on April 12, seeking topromote reconciliatton in a nation racked byethnic bloodshed and to head off any massslaughter on a scale similar to Rwanda.展开更多
基金supported by the National Natural Science Foundation of China (10872096)the Open Fund of State Key Laboratory of Explosion Science and Technology, Beijing University of Science and Technology (KFJJ09-13)
文摘Gaseous detonation propagating in a toroidal chamber was numerically studied for hydrogen/oxygen/nitrogen mixtures. The numerical method used is based on the three-dimensional Euler equations with detailed finiterate chemistry. The results show that the calculated streak picture is in qualitative agreement with the picture recorded by a high speed streak camera from published literature. The three-dimensional flow field induced by a continuously rotating detonation was visualized and distinctive features of the rotating detonations were clearly depicted. Owing to the unconfined character of detonation wavelet, a deficit of detonation parameters was observed. Due to the effects of wall geometries, the strength of the outside detonation front is stronger than that of the inside portion. The detonation thus propagates with a constant circular velocity. Numerical simulation also shows three-dimensional rotating detonation structures, which display specific feature of the detonation- shock combined wave. Discrete burning gas pockets are formed due to instability of the discontinuity. It is believed that the present study could give an insight into the interest- ing properties of the continuously rotating detonation, and is thus beneficial to the design of continuous detonation propulsion systems.
基金National Natural Science Foundation of ChinaNatural Science Foundation of Guangxi
文摘Three Complexes of the formula [Cd (4,4'-bpy)_2 (H_2O)_2]_n. (pic)_(2n) (1) [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n(H_2O)_n (pic)-(2n) (2) and [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n (pic)-(2n)(H_2O)_n (3) (4.4'-bpy = 4.4'-bipyridine. pic = picric anion ) have been synthesized and characterized by elemental analysis and single-crystal x-ray diffraction. They all have infinite three-dimensional network structure. crystallizing in the monoclinic space group C2/c (1) and Cc (2.3).
基金item of significant subject construction in Shanghai
文摘3 - dimensional body measurement technology, the basis of developing high technology in industry, accelerates digital development of aplparel industry. This paper briefly introduces the history of 3 - dimensional body measurement technology, and recounts the principle and primary structure of some types of 3 - dimensional automatic body measurement system. With this understanding, it discusses prospect of 3- dimensional CAD and virtual technology used in apparel industry.
基金supported by the National Natural Science Foun-dation of China (10972228,11002150,and 91016025)the Basic Research Equipment Project of Chinese Academy of Sciences(YZ200930)
文摘Shot peening is a widely used surface treatment method by generating compressive residual stress near the surface of metallic materials to increase fatigue life and re- sistance to corrosion fatigue, cracking, etc. Compressive re- sidual stress and dent profile are important factors to eval- uate the effectiveness of shot peening process. In this pa- per, the influence of dimensionless parameters on maximum compressive residual stress and maximum depth of the dent were investigated. Firstly, dimensionless relations of pro- cessing parameters that affect the maximum compressive residual stress and the maximum depth of the dent were de- duced by dimensional analysis method. Secondly, the in- fluence of each dimensionless parameter on dimensionless variables was investigated by the finite element method. Fur- thermore, related empirical formulas were given for each di- mensionless parameter based on the simulation results. Fi- nally, comparison was made and good agreement was found between the simulation results and the empirical formula, which shows that a useful approach is provided in this pa- per for analyzing the influence of each individual parameter.
基金＊The project supported by National Natural Science Foundation of China under Grant No. 90203008 and the Doctoral Foundation of the Ministry of Education of China
文摘Based on our previously pulse-coupled integrate-and-fire neuron model in small world networks, we investigate the effects of different connectivity topologies on complex behavior of electroencephalographic-like signals produced by this model. We show that several times series analysis methods that are often used for analyzing complex behavior of electroencephalographic-like signals, such as reconstruction of the phase space, correlation dimension, fractal dimension, and the Hurst exponent within the rescaled range analysis （R/S）. We lind that the different connectivity topologies lead to different dynamical behaviors in models of integrate-and-fire neurons.
文摘 With the trust and support by WFO and its members,Foundry Institution of Chinese Mechanical Engineering Society (FICMES) will host the 69th World Foundry Congress (WFC2010). We cordially invite you to participate in the 69th WFC to be held on October 16-20,2010,in Hangzhou,China.……
文摘)The 2008 IEEE World Congress on Computational Intelligence (WCCI 2008) will be held at the HongKong Convention and Exhibition Centre during June 1-6, 2008. WCCI 2008 will be the fifth milestone inthis series with a glorious history from WCCI 1994 in Orlando, WCCI 1998 in Anchorage, WCCI 2002in Honolulu, to WCCI 2006 in Vancouver. Sponsored by the IEEE Computational Intelligence Society,
文摘More than 20000 representatives and tourists from 170 countries and regions participated in the World Festival of International. Youth which opened on July 1 in Pyongyang.
文摘On January 4, United States planes shot down two Libyan jet fighters over the Mediterranean Sea. This is the first fighting between the US and Libya since US jets bombed Tripoli in 1986. But on January 12, the United States, Britain and France, in a rare triple veto, blocked a Security Council resolution to deplore the shooting down of two Libyan jets by US navy fighters. President Fidel Castro of Cuba announced on January 4 in Havana that the first 3000 Cuban troops to be withdrawn from
文摘The European Union summit ended on December 16 in Madrid. European leaders set their seal on a drive to make Europe a global power ready for challenges of the next century with a new currency and a new list of members. The US federal government partially shut down for the second time in a month on December 16, with President Bill
文摘Organizer,date and venueThe Second World Conference on Digestology will beheld in the Beijing International Convention Center,Beijing,China on September 8-11,2000 by World Journal ofGastroenterology and World Chinese Journal of Digestologyand the Committee of World Digestology Network(http://www.wd.org.cn).About 2000 participants are expected toattend the meeting.
文摘Organizer,date and venueThe Second World Conference on Digestology will beheld in the Beijing International Convention Center,Beijing,China on September 8-11,2000 by World Journal ofGastroenterology and World Chinese Journal of Digestologyand the Committee of World Digestology Network (http://www.wd.org.cn).About 2000 participants are expected toattend the meeting.
文摘The World Journal of Gastroenterology Editorial Board consists of 685members,representing a team of worldwide experts in gastroenterologyand hepatology.They are from 52 countries including:Albania(1),Argentina(1),Australia(16).Austria(7),Belarus(1),Belgium(11),Brazil(1),Bulgaria(1),Canada(10),China(58),Croatia(2),Czech(1),Denmark(5),Egypt(3),Finland(1),France(27).Germany(71),Greece(1),Hungary(1).Iceland(1),India(6),Iran(2),Ireland(2),Israel(5),Italy(51),Japan(137),Lebanon(2),Lithuania(1),Macedonia(1),Malaysia(3),Mexico(2),Monaco(1),Netherlands(15),New Zealand(1),Nigeria(1),Norway(2),Pakistan(1),Poland(6),Portugal(1),Russia(3),Singapore(3),Slovakia(1),South Africa(1),South Korea(9),Spain(27),Sweden(6),Switzerland(8),Turkey(7),United Arab Emirates(1),United Kingdom(37).United States(121),Yugoslavia(1).
文摘Russian President Boris Yeltsin, after an emphatic election victory, made a plea on July 4 for national reconciliation. With over 99 per cent of the vote counted, Yeltsin had 53. 70 per cent to Zyuganov’s 40.41 per cent. The 65-year-old persident’s victory will return him to
文摘Struggling to rebuild a mission near collapse,the UN Security Council voted on June 16 toenlarge its force in Bosnia to include up to12500 heavily armed troops.
文摘On August 5, US President Bill Clinton signed into law a bill to punish foreign companies that invest in oil and gas projects in Iran or Libya. The law, which sparked vehement protests from European countries, was designed to discourage investment in Iran and Libya. On August 14, Iran’s Parliament Speaker Ali Akbar Nateq-nouri vowed to take stance against US domination
文摘On June 2, US President Bill Clinton renewedthe Most-Favoured Nation trade status for Chinafor another year on the recommendation of USSecretary of State Warren Christopher.
文摘Retired senior Chinese leader Chen Yun died atage 90 of an illness at 14:04 on April 10 inBeijing. An Organization of African Unity missionarrived in Burundi on April 12, seeking topromote reconciliatton in a nation racked byethnic bloodshed and to head off any massslaughter on a scale similar to Rwanda.
