granule-cutting quality instability appeared in process of PET production,and analyses mainly the causes of forming irregular granules such as prism.
结合生产实际情况，针对ＰＥＴ生产中存在切粒质量不稳定的问题进行讨论，着重分析了造成ＰＥＴ条在切削过程中产生菱形毛刺等异状粒子的原因，并提出了相应的解决办法。
The necessary and sufficient conditions for a class of n-dimensional self-mapping sequence with abnormal points;
一类n维自映射列有异状点的充要条件
Necessary and sufficient conditions for class of n-dimensional self-mnappings with abnormal points;
一类n维自映射有异状点的充要条件
The necessary and sufficient conditions of no abnormal points for a class of n-dimensional self-mapping;
一类n维自映射无异状点的充要条件
Here we present features for f with homochinic points.
设f是可降的N维自映射,则可以用可降映射的特征,给出这类自映射有异状点的特征——存在f的链回归点,但不是周期点,并且f的ω-极限点集与周期点集的交非空。
This paperpresents sl)ecific featrue for f with homochinic points.
设ｆ是可降的二维自映射，本文给出了这类自映射有异状点的特征──存在ｆ的链回归点，但不是周期点，并且ｆ的队极限点集与周期点集的交非空。
It is shown that the following statements are equivalent: 1) f has a homoclinic point; 2) f has positive topological entropy; 3) There exists an m∈N such that {mk : k ∈ N} (?) Per(f); 4) There exists an n ∈ N such that fn has a 2-horseshoe.
设f∈C°(T,T)是树T上的连续自映射,N为自然数集,则下述条件等价: 1)f有异状点; 2)f的拓扑熵大于零; 3)存在m∈N使得{mk:k∈N}(?)Per(f); 4)存在n∈N使得fn具有2-马蹄。
Genetic Analysis and Fine Mapping of an Abnormal Glume and Multi-pistil Mutant in Rice;
水稻异状颖壳、多雌蕊突变体的遗传分析与精细定位