排序方式： 共有43条查询结果，搜索用时 15 毫秒
41.
阿牛曲哈莫 《西昌学院学报(社会科学版)》2003,15(3):31-33
抗战时期的川康建设视察团是在一届三次国民参政会后,由川康建设期成会组成的。视察团分赴川、康两省考察之后,编拟了《国民参政会川康建设视察团报告书》,为建设大后方落后的川康地区提供了重要的第一手资料。川康视察团的成立是川康地区丰富的自然资源和落后的社会经济之间的矛盾在抗战背景下凸现的结果,也是顺应各种政治力量的需求而得以实现的。 相似文献
42.
A quantitative risk assessment is needed for each quarantine pest insect to ensure quarantine security without sacrificing
the transparency of international trade. The probability of introduction, which is defined as the probability that one or
more reproductive individuals of a pest insect species pass the port, is one of the basic components determining the risk
of pest invasion. The probability depends on two biological characteristics of pests: mode of reproduction and spatial distribution
of insects per host plant. In this article, the probability of introduction was calculated for each of the following four
categories: (1) bisexual, gregarious pests; (2) bisexual, solitary pests; (3) parthenogenetic, gregarious pests; and (4) parthenogenetic,
solitary pests. Then, equations were derived to predict the effects of two prevention practices conducted before export: disinfestation
treatment and the subsequent export sampling inspection of consignments. These equations also enable estimation of the probability
of introduction under natural mortality, which thus can be used in place of the criterion of Maximum Pest Limit (MPL). The
method was applied to the Mexican fruit fly Anastrepha ludens (Loew), as an example. The contour graph of the probability of introduction indicated the optimal combination of the intensity
of two prevention practices that ensures a given security level. Existence of an antagonistic interaction was also indicated
between the disinfestation treatment and the subsequent sampling inspection.
Received: January 22, 1999 / Accepted: September 6, 1999 相似文献
43.
文成帝《南巡碑》可进一步充实对北魏前期以幢将郎卫制度为主体的禁卫武官制度的认识。《南巡碑》所见幢将有内都幢将、三郎幢将、雅乐真幢将、内小幢将等 ,内都幢将当为负责殿中宿卫的禁卫长官。《南巡碑》所见斛洛真即胡洛真 ,意即“带仗人”(宿卫者 ) ,斛洛真军将或即宿卫军将。雅乐真、胡洛真可能就是史书中常见之羽林、虎贲 (郎 )。《南巡碑》可见大量郎官———内行内三郎、内三郎、三郎 ,内三郎多兼将军号。北魏前期亦有左右卫、武卫、四军、骁游等将军 ,似亦为禁卫武官。左卫将军所兼之南部折纥真即南部下大夫 (尚书南部侍郎 )。文成帝时禁卫武官出身于五六十个家族 ,归附拓跋鲜卑的各部族几乎都有代表人物任职于北魏禁卫武官系统 ,主要以帝室十姓、勋臣八姓及素和氏、斛律氏等约十余个家族为主。高车 (敕勒 )族的乙旃 (叔孙 )、斛律氏与北魏禁卫军权的关系极为密切。禁卫武官的出身和来源从一个侧面反映了北魏前期政权浓厚的民族特色及广泛的代表性 相似文献