charge factor
2.The cause that causes cerebral blood-vessel block basically has two kinds: It is a head thrombosis, it is the pathological changes as a result of cerebral blood-vessel itself, often make the film inside tubal antrum coarse because of sclerosis of appearance of cerebral artery congee, be in charge of antrum stricture, below certain condition, if blood pressure is reduced, blood stream is slow, blood sticks consistency heighten, the cruor factor such as plaque, condense inside blood-vessel agglomerate, form cerebral thrombus.
3.Self─consistent charge discrete variational Xα cluster method (SCC─DVM ─Xα) is used to calculate the conduction electron densities of metals. Comparing with experimental data of positron annihilation rate,a relation between electron density and positron annihilation rate,and an expression of enhancement factor were obtained.
4.The optimum conditions of pulping were as follows; charge of effective alkali 14% (based on Na2O), sulfidity 30%, ratio of weight of oven dry wood material to volume of cooking liquor 1:5, and H-factor 1000. With the elemental-chlorine-containing sequences, ECF (elemental chlorine free) sequences and TCF (total chlorine free) sequences, bleached kraft pulps with high ISO brightness and high physical properties could be produced.
