Today telex and cable are two important means usod in communication with customors abroad. In telex,as it is not chargod by the number of words but by the minute,more words can be used to express our idea,so it is les...Today telex and cable are two important means usod in communication with customors abroad. In telex,as it is not chargod by the number of words but by the minute,more words can be used to express our idea,so it is less difficult for our students to learn,while in cable we,in order to save money,展开更多
A multi-objective optimization model for draft scheduling of hot strip mill was presented, rolling power minimizing, rolling force ratio distribution and good strip shape as the objective functions. A multi-objective ...A multi-objective optimization model for draft scheduling of hot strip mill was presented, rolling power minimizing, rolling force ratio distribution and good strip shape as the objective functions. A multi-objective differential evolution algorithm based on decomposition （MODE/D）. The two-objective and three-objective optimization experiments were performed respectively to demonstrate the optimal solutions of trade-off. The simulation results show that MODE/D can obtain a good Pareto-optimal front, which suggests a series of alternative solutions to draft scheduling. The extreme Pareto solutions are found feasible and the centres of the Pareto fronts give a good compromise. The conflict exists between each two ones of three objectives. The final optimal solution is selected from the Pareto-optimal front by the importance of objectives, and it can achieve a better performance in all objective dimensions than the empirical solutions. Finally, the practical application cases confirm the feasibility of the multi-objective approach, and the optimal solutions can gain a better rolling stability than the empirical solutions, and strip flatness decreases from （0± 63） IU to （0±45） IU in industrial production.展开更多
The development and growing population has resulted in the increasing demand for potable water in tiny atolls of Lakshadweep group,off the western coast of India.In recent years,the groundwater quality,in such atolls,...The development and growing population has resulted in the increasing demand for potable water in tiny atolls of Lakshadweep group,off the western coast of India.In recent years,the groundwater quality,in such atolls,has been deteriorated due to indiscriminate exploitation of groundwater to meet the demand.Thus arranging a sustainable supply of groundwater has become the most challenging task on these tiny atolls for the survival of human life. Groundwater floats in the form of thin lens,which展开更多
(July 16-31, 1993) The third annual Ibero-American summit meeting in Salvador, Brazil, closed on July 16. It called for freer, fairer trade. The leaders critized the US trade embargo against Cuba and called for greate...(July 16-31, 1993) The third annual Ibero-American summit meeting in Salvador, Brazil, closed on July 16. It called for freer, fairer trade. The leaders critized the US trade embargo against Cuba and called for greater support from rich nations in a final draft of the Ibero-American summit declaration. The Salvador declaration was signed by more than 20 heads of state.展开更多
Hundreds of thousands of black workers in South Africa began a nationwide strike on August 3 to demand an end to white rule. The anti-government general strike was called by the African National Congress. Israeli Prim...Hundreds of thousands of black workers in South Africa began a nationwide strike on August 3 to demand an end to white rule. The anti-government general strike was called by the African National Congress. Israeli Prime Minister Yitzhak Rabin left Jerusalem on August 7 for Washington for his first summit with US President George Brash. On August 11, Bush announced his approval of up to $10 billion in US loan展开更多
On July l, Cambodia’s newly elected assembly unanimously approved an interim coalition government. The interim government will serve Cambodia for the next three months before a new constitution is written.
Haitian President Jean-Bertrand Aristide made a joy-filled return from exile on October 15, delivering a powerful appeal for reconciliation and an end to bloodshed in the impoverished Caribbean nation. Aristide had no...Haitian President Jean-Bertrand Aristide made a joy-filled return from exile on October 15, delivering a powerful appeal for reconciliation and an end to bloodshed in the impoverished Caribbean nation. Aristide had not set foot on Haitian soil since soon after he was deposed by the military in a bloody coup in September 1991. Veteran Chancellor Helmut Kohl展开更多
(June 1-15, 1993) On June 5, the United Nations Environmental Programme held meeting at the Great Hall of the People in Beijing marking the 21st World Environment Day. Over 500 people from across the country and from ...(June 1-15, 1993) On June 5, the United Nations Environmental Programme held meeting at the Great Hall of the People in Beijing marking the 21st World Environment Day. Over 500 people from across the country and from UNEP and other international organizations participated the commemorative conference.展开更多
文摘Today telex and cable are two important means usod in communication with customors abroad. In telex,as it is not chargod by the number of words but by the minute,more words can be used to express our idea,so it is less difficult for our students to learn,while in cable we,in order to save money,
基金Projects(50974039,50634030)supported by the National Natural Science Foundation of China
文摘A multi-objective optimization model for draft scheduling of hot strip mill was presented, rolling power minimizing, rolling force ratio distribution and good strip shape as the objective functions. A multi-objective differential evolution algorithm based on decomposition （MODE/D）. The two-objective and three-objective optimization experiments were performed respectively to demonstrate the optimal solutions of trade-off. The simulation results show that MODE/D can obtain a good Pareto-optimal front, which suggests a series of alternative solutions to draft scheduling. The extreme Pareto solutions are found feasible and the centres of the Pareto fronts give a good compromise. The conflict exists between each two ones of three objectives. The final optimal solution is selected from the Pareto-optimal front by the importance of objectives, and it can achieve a better performance in all objective dimensions than the empirical solutions. Finally, the practical application cases confirm the feasibility of the multi-objective approach, and the optimal solutions can gain a better rolling stability than the empirical solutions, and strip flatness decreases from （0± 63） IU to （0±45） IU in industrial production.
文摘The development and growing population has resulted in the increasing demand for potable water in tiny atolls of Lakshadweep group,off the western coast of India.In recent years,the groundwater quality,in such atolls,has been deteriorated due to indiscriminate exploitation of groundwater to meet the demand.Thus arranging a sustainable supply of groundwater has become the most challenging task on these tiny atolls for the survival of human life. Groundwater floats in the form of thin lens,which
文摘(July 16-31, 1993) The third annual Ibero-American summit meeting in Salvador, Brazil, closed on July 16. It called for freer, fairer trade. The leaders critized the US trade embargo against Cuba and called for greater support from rich nations in a final draft of the Ibero-American summit declaration. The Salvador declaration was signed by more than 20 heads of state.
文摘Hundreds of thousands of black workers in South Africa began a nationwide strike on August 3 to demand an end to white rule. The anti-government general strike was called by the African National Congress. Israeli Prime Minister Yitzhak Rabin left Jerusalem on August 7 for Washington for his first summit with US President George Brash. On August 11, Bush announced his approval of up to $10 billion in US loan
文摘On July l, Cambodia’s newly elected assembly unanimously approved an interim coalition government. The interim government will serve Cambodia for the next three months before a new constitution is written.
文摘Haitian President Jean-Bertrand Aristide made a joy-filled return from exile on October 15, delivering a powerful appeal for reconciliation and an end to bloodshed in the impoverished Caribbean nation. Aristide had not set foot on Haitian soil since soon after he was deposed by the military in a bloody coup in September 1991. Veteran Chancellor Helmut Kohl
文摘(June 1-15, 1993) On June 5, the United Nations Environmental Programme held meeting at the Great Hall of the People in Beijing marking the 21st World Environment Day. Over 500 people from across the country and from UNEP and other international organizations participated the commemorative conference.
