In a recent work, Hayat et al. [4] considered several transient flows of a second-grade (SG) fluid (see [3, 6, 8] and the references therein). Included in their study was the case of a SG fluid undergoing start-up Couette flow between two infinite parallel plates. (Here, we should mention that various versions of this problem for SG fluids have been studied [1, 5, 9].) Unfortunately, a detailed...

Anagyrus brevifuniculus Zu & Li, sp. nov., A. maculistigmus Zu & Li, sp. nov. and A. pseudobicolor Zu & Li, sp. nov. are described; A. tricolor (Girault) is newly recorded from the Palaearctic region and A. matritensis (Mercet) from China. New distributional data for A. fusciventris (Girault) and A. jenniferae Noyes & Hayat are also provided.

any philosophical poet has a utopia. jamil sidqi al-zahawi was a philosophical poet, who analyzed phenomena of the universe from a philosophical perspective. he played a great role in awakening and motivating the nation and in developing in them the need for a better life. his intention was to promotecertain humanistic values in the society with his poems, and he therefore set out to build foun...

In this study, the Al/Al2O3-SiC hybrid composite was produced by accumulative roll bonding (ARB). In the first and the second cycles, the particles were uniformly poured between the Al strips during each ARB cycle. In the subsequent cycles, ARB was repeated up to six cycles without adding the particles between the layers. After the total eight cycles, the particles were distributed uniformly wi...

this paper criticizes the model and the new definition for osmotic pressure given by parsafar et al. [j. sci. i. r. iran, vol. 10, no. 4, 233 (1999)]. the model is a closed system containing 1 kg of solvent plus m mole of solute at constant temperature and under pressure p0 + ? where p0 is the standard pressure and ? is the osmotic pressure of the corresponding m molal solution. while the total...