In this paper,the extrusion die-swell effect(Barus effect) of polyacrylonitrile spinning dope and the congregating structure and properties of the protofibers were systematically analyzed by means of the die-swell ratio,the boiling-water shrinkage ratio,X-ray diffraction(XRD),electron microprobe analysis(EMPA),porosity and mechnical properties analysis,etc. It revealed the formation mechanism of the die-swell effect and spin orientation and its influences on the structure and properties of the protofibers.
Based on the time dilation effect formula and speed conversion formula of special relativity and viewed from singular inertial system, the "twin paradox" issue of relativity is calculated and discussed compactly.
It is indicated by the experiment that under high temperature, aluminium and silicon are oxidated into Al 2O 3 and SiO 2 and then reacted with CaO to form C 3A and dicalcium silicate, and then α-C 2S→β-C 2S. These series of reactions reduce the production of Al 3C 4 and SiC, and, on the other hand, lead to the considerable expansion of volume, so that the structure of the product is changed greatly.
For convenience of analyses,the concepts of thermal consolidation time factor and coefficient of thermal consolidation are defined. The thermal consolidation characteristics and its mechanism are studied. The effects of ratio of thermal consolidation coefficient to thermal diffusivity,and various combinations of external load and temperature are analyzed.
When the temperature varies, not only the refractive index of the optical medium is changed because of the thermo-optical effect, but also the thickness of the optical medium is changed due to the thermal-expansion effect.
A similar analysis is presented for the "work-of-expansion" effect.
To minimize the thermal expansion effect, large focal length is required indicating need for a compensation scheme to attain larger channel number.
The expansion effect is a function of surface pressure.
Stemming is also effective in most contexts, generally almost as good as lemmatization and typically much less expensive; besides it also has a query expansion effect.
Further analysis suggested that the apparent change in lumen dimensions suggested by particular R-values was mitigated by the bulking effect of extractives in the cell wall.
Based on this fact and the results of repeated water soaking and oven-drying tests, it was found that the bulking effect was a major factor, and that decreased hygroscopicity contributes only slightly to the dimensional stabilization by acetylation.
Further experiments are required to compare the ability of these materials to induce a sustained in vivo bulking effect.
In general, the bulking effect is largely involved in the physiological actions of insoluble fiber.
This suggests that the bulking effect does not contribute to the promotion of zinc absorption by corn husk fiber.