By investigation on the relationship between period , quantity , extend of ostrinia furnacalis emergence and meteorological factors in qiqihaer , this paper analyzes the factors which effect on period , quantity , extend of ostrinia furnacalis about annual wave . the beginning time of ostrinia furnacalis pupae emergence depends on average temperature in may and june , weather conditions in july decide whether ostrinia furnacalis pupae finish ahead of time ; the beginning time of eclosion is decided by average lowest temperature and precipitation in may and june , and the end time of eclosion is decided by average lowest temperature in june and july , meantime , the length of time of ostrinia furnacalis eclosion and time of grub emergence influence on the extent of ostrinia furnacalis . an important condition of a great emergence of ostrinia furnacalis is that how temperature matchs humidity , which substantially result in reduction of maize output 本研究项目通过对齐齐哈尔市玉米螟发生期、发生量、发生程度与气象条件关系的分析，找出玉米螟发生期、发生量、发生程度年际波动的影响因子： 5 、 6月的平均气温决定了玉米螟化蛹开始的早晚， 7月的天气条件决定玉米螟化蛹是否提前结束； 5 、 6月的平均最低气温和降水则决定羽化开始的早晚， 6 、 7月的平均最低气温又决定了玉米螟羽化结束的早晚；而玉米螟羽化持续时间的长短和幼虫发生的早晚影响了玉米螟的发生程度；温湿条件配合适当与否是促使玉米螟大发生的重要条件，玉米螟大发生又会引起玉米的大幅度减产。
2 . the new idea about classification of oil and gas accumulation unit for exploration have been put forward , which holds the sound basis for the perpendicular and plane position and prediction of carbonate reservoir in feixianguan guan group . 3 . the depositional systems of feixianguanguan group in taphrogenic consist of carbonate platform facies ( include oolitic bar , oolitic beach , lagoon , flats ) , margin shelf and trough . there are five development staged in taphrogenic trough 3 、指出裂陷槽中飞仙关组沉积体系在平面上由碳酸盐岩台地相(包括滩坝相、鲕滩相、泻湖相、潮坪相) 、陆棚相、裂陷槽相组成，裂陷槽经历了发生期、发展期、稳定期、过渡期及衰亡期五大发展演化阶段，每一阶段各发育不同的沉积相，且以一种沉积相为主。
Objectives : the aim of the present study was to evaluate whether patients with paroxysmal atrial fibrillation ( af ) without symptoms of cerebral ischemia or significant carotid stenosis have reduced blood flow through the middle cerebral arteries ( mcas ) , as well as to assess differences between blood flow through the mcas during af and after cardioversion 目的：本研究目的在于评价没有脑缺血症状或没有明显颈动脉狭窄的阵发性心房纤颤患者是否存在大脑中动脉血流的下降，而且对房颤发生期和心脏复律期大脑中动脉血流的差异进行比较。
