The Holy Quran, which is full of light and guidance, is guidance in various aspects of human life. In this article, one of the surahs of the Holy Quran has been selected and by investigating one of the topics of this surah, the issue of RHEOLOGY has been investigated by focusing on the surah of the Holy Quran. In this surah, topics such as "Zahar, adopted son, Ulu al-Arham, war of the parties (Khandagh), Ahle Ketab (Jews of Bani Nazir, etc. ), disobedience to infidels and hypocrites, marriage, divorce, hejab, getting permission when entering the house, the trend of Afak, the offering of divine trust to human beings, etc. " has been stated. But in this article, focusing on the war between the parties (Khandagh), only the subject of "RHEOLOGY" is investigated. The method of collecting materials in this discourse is library method and using interpretive and hadith software and using different Quranic sites.

Concrete incorporating steel fibers poses difficulty in mixing, transporting, placing and compacting that may lead to voids in hardened concrete. The determination of fresh fiber reinforced concrete properties is therefore, important for satisfactory performance in hardened state. The present experimental study investigates effect of three fiber properties volume fraction of fiber, aspect ratio of fiber and diameter of fiber- on the rheological properties of high performance concrete with a parallel plate rheometer. The test result shows that yield stress and plastic viscosity are adversely affected by all the three parameters. Fiber volume concentration has the highest effect on the measured rheological parameters whereas fiber diameter has the least effect.

Background and Objectives: Today, the use of cellulosic nanofibers is widely researched for the production of various products, such as paper and paperboard. Cellulose nanofibers are made from pulp produced from various lignocellulosic sources in various methods. The quality of these materials can be evaluated in different ways. Meanwhile, the RHEOLOGY indices of cellulosic nanofibers are one of the simplest and least costly methods to evaluate the quality of this material. In this paper, specifically, the relationship between indices of RHEOLOGY of cellulosic nanofibers and their ability to improve paper and board strengths for papermaking are introduced. Materials and Methods: In this article, materials were categorized in terms of RHEOLOGY sciences and cellulose nanofibers were specified among them. Then, important indices of RHEOLOGY of cellulose nanofibers such as yield point, damping coefficient, storage modulus, loss modulus, and yield strain were introduced by presenting some of the results of measuring the rheological indices of cellulosic nanofibers. In the following, the relationship between rheological indices and strengthening ability of cellulose nanofibers to improve tensile and burst strengths of paper and paperboard production were investigated. Results: The more storage modulus, as the most sensitive parameter in viscoelastic measurements compared to the loss modulus, the more viscoelastic ability and more elastic tendency. For cellulose nanofibers, if the ratio of the storage modulus is about 4 times greater than the loss modulus in the same concentrations, this indicates that the material is viscoelastic with considerable elasticity. If the amount of damping coefficient for cellulose nanoparticle gel is less than 0. 3, this indicates that these gels are highly elastic with components in the nanometer scale and these characteristics indicate the presence of tangled cellulose nanofiber network and as a result, more strengthening feature is available for a variety of applications as strengthening paper and paperboard products. The critical strain on the behavior of the cellulosic nanofiber’ s RHEOLOGY appears almost independent of its dry matter content which implies the sustainability of the viscoelastic properties of these gels. The thick and dilute produced nanofiber gels have an exponential, with power 3, relationship with dry content ( ). The exponential, with power 3, relationship between the modulus and dry matter percentage is one of the criteria for the achievement of a gel of nanoscale cellulosic fibres. Conclusion: In general, cellulose nanofibers gel is considered as a viscoelastic and thixotropic fluid and when used in paper and paperboard productions, the higher elastomeric index of it creates more strength properties of products. Therefore, in order to predict the achievement of nanosized fibres gel during production, a cheaper evaluation of the cellulosic RHEOLOGY indices could be used instead of expensive images and even with the comparison of two types of cellulosic nanofibers, their rheological properties predict their performance for reinforcing paper and paperboard.

HDPE/Clay nanocomposites were prepared using laboratory made HDPE grafted maleic anhydride (HDPE-gMA) as a compatibilizer. RHEOLOGY, morphology, and thermal behavior of nanocomposites were studied. The results showed that increasing the degree of grafted MA increased the intercalation of clay platelets leading to their exfoliation. The presence of free MA enhanced the clay dispersion via regrafting onto PE matrix. Although the presence of antioxidant improved the thermal stability of PE, it decreased the clay dispersion because of inhibition of regrafting of free MAs. The exfoliated nanocomposites exhibited higher viscosity and elasticity than those of intercalated nanocomposites. They displayed viscosity upturn and nonterminal behavior of elasticity at low frequency ranges, representative of the creation of three-dimensional networks via the individual clay platelets and/or chain bridging between the platelets. The presence of such a network was evidenced by tan delta studies. Incorporation of clay remarkably increased the thermal stability of the PE. It was found that the effect of Hofmann elimination reaction can effectively be eliminated using the antioxidant. POLYM. COMPOS., 31:1028-1036, 2010.