Research and development of the simulator for special use in weaponry FMS,sponsored by Prof Wang Ningsheng,recently passed the technical apprasial organized in Peking by the Av iation Industries of China.
The Emei mustache toad, Leptobrachium boringii （Megophryidae）, is terrestrial but breeds in permanent streams. Primarily, it has a polygynous mating system and polyandry also occurs. The species vigorously defends s...The Emei mustache toad, Leptobrachium boringii （Megophryidae）, is terrestrial but breeds in permanent streams. Primarily, it has a polygynous mating system and polyandry also occurs. The species vigorously defends submerged nest sites. We report on a reproductive study at Mt. Emei, western China conducted in 2004, 2006, 2007, 2009, and 2011 during the breeding season. Males produce both advertisement and courtship calls underwater, and the latter differs from the former in having an additional trill-like last note of low intensity. Females might determine the oviposition location and hence the egg mass location. A low, submissive posture can be adopted by the male to avoid being attacked by other males. When fighting, the maxillary nuptial spines are employed as weapons, and males hold their opponents on their spines with the forelimbs that enlarge during the breeding season. Male body size and the quantity of fight wounds on its ventral side are positively correlated. Satellite male mating might exist in L. boringii. Additionally, underwater calls from another population of this species and a population of L. leishanense generally are similar to those of the population from Mt. Emei.展开更多
In the case of three-layered(air-seawater-seabed)model,the analytical expressions of the static electric and static magnetic field produced by the static electric dipole located in seawater were derived by using the m...In the case of three-layered(air-seawater-seabed)model,the analytical expressions of the static electric and static magnetic field produced by the static electric dipole located in seawater were derived by using the mirror image theory.Combined with the distribution of the underwater electric potential measured in laboratory,an electric dipole model for physical scale of ship was established and the distribution characteristics of an actual ship' s corrosion related magnetic field were obtained.Based on established models,theoretical analysis and calculation were made to catch out the distribution characteristics of static magnetic field related with corrosion and anticorrosion,which can not be measured directly in seawater.The results show that the static magnetic field related with corrosion and anticorrosion is a kind of noteworthy obstacle signal for degaussed ships.展开更多
In the present world, international strategic pattern is entering a period of reconstitution and readjustment in the high tide of new technological revolution and the fierce turbulence of political situation. The inte...In the present world, international strategic pattern is entering a period of reconstitution and readjustment in the high tide of new technological revolution and the fierce turbulence of political situation. The interweaving of the presence and continuing development of strategic nuclear weapons with the great achievement and rapid advance of space technology leads our world into an era of ' space-nuclear overlapping'. The detente and the dialogue on the earth cover up the confrontation and contention in the outer space. In the wake of the implementation and progress of SDI, the prospects of 'star wars' cast hazy shadows on the development and employment of outer space. What is the outlook of the space? What impact will the exploitation of outer space make on the economic life , political life and military confrontation of the human society, along with the progress of space technology? This article analyses and discusses the relevant issues from the grand strategic, and scientific and technological point of view.展开更多
文摘Research and development of the simulator for special use in weaponry FMS,sponsored by Prof Wang Ningsheng,recently passed the technical apprasial organized in Peking by the Av iation Industries of China.
基金supported by the National Natural Sciences Foundation of China(NSFC-30870278,NSFC-30900134)Chinese Academy of Sciences(08B3031100,09C3011100,KSCX-SW-119,KSCX2-YW-Z-0906,KSCX2-EW-J-22)
文摘The Emei mustache toad, Leptobrachium boringii （Megophryidae）, is terrestrial but breeds in permanent streams. Primarily, it has a polygynous mating system and polyandry also occurs. The species vigorously defends submerged nest sites. We report on a reproductive study at Mt. Emei, western China conducted in 2004, 2006, 2007, 2009, and 2011 during the breeding season. Males produce both advertisement and courtship calls underwater, and the latter differs from the former in having an additional trill-like last note of low intensity. Females might determine the oviposition location and hence the egg mass location. A low, submissive posture can be adopted by the male to avoid being attacked by other males. When fighting, the maxillary nuptial spines are employed as weapons, and males hold their opponents on their spines with the forelimbs that enlarge during the breeding season. Male body size and the quantity of fight wounds on its ventral side are positively correlated. Satellite male mating might exist in L. boringii. Additionally, underwater calls from another population of this species and a population of L. leishanense generally are similar to those of the population from Mt. Emei.
基金Sponsored by National Defense Pre-research Foundation(51444070105JB11)
文摘In the case of three-layered(air-seawater-seabed)model,the analytical expressions of the static electric and static magnetic field produced by the static electric dipole located in seawater were derived by using the mirror image theory.Combined with the distribution of the underwater electric potential measured in laboratory,an electric dipole model for physical scale of ship was established and the distribution characteristics of an actual ship' s corrosion related magnetic field were obtained.Based on established models,theoretical analysis and calculation were made to catch out the distribution characteristics of static magnetic field related with corrosion and anticorrosion,which can not be measured directly in seawater.The results show that the static magnetic field related with corrosion and anticorrosion is a kind of noteworthy obstacle signal for degaussed ships.
文摘In the present world, international strategic pattern is entering a period of reconstitution and readjustment in the high tide of new technological revolution and the fierce turbulence of political situation. The interweaving of the presence and continuing development of strategic nuclear weapons with the great achievement and rapid advance of space technology leads our world into an era of ' space-nuclear overlapping'. The detente and the dialogue on the earth cover up the confrontation and contention in the outer space. In the wake of the implementation and progress of SDI, the prospects of 'star wars' cast hazy shadows on the development and employment of outer space. What is the outlook of the space? What impact will the exploitation of outer space make on the economic life , political life and military confrontation of the human society, along with the progress of space technology? This article analyses and discusses the relevant issues from the grand strategic, and scientific and technological point of view.
