Drag of a Sphere in the Critical Reynolds Number Range

Investigation of Drag Coefficient at Subcritical and Critical Reynolds Number Region for Circular Cylinder with Helical Grooves

Drag reduction of an object is the major concern in many engineering applications. Experimental studies have been carried out on circular cylinder with helical grooves in a subsonic wind tunnel. Different cases of helical grooves with different pitches, helical groove angles and number of starts of helical groove on circular cylinder are tested. Experimental results show the drag coefficient is...

the effect of using critical discourse analytical tools on the improvement of the learners level of critical thinking in reading comprehension

?it is of utmost priority for an experienced teacher to train the mind of the students, and enable them to think critically and correctly. the most important question here is that how to develop such a crucial ability? this study examines a new way to the development of critical thinking utilizing critical discourse analytical tools. to attain this goal, two classes of senior english la...

Three-sphere low-Reynolds-number swimmer near a wall.

We study the influence of a wall on the dynamics of a low-Reynolds-number three-sphere swimmer. A far swimmer whose arm makes an angle theta with the horizon experiences the wall presence as an angle-dependent quadrupole force proportional to (a/L)(2)(L/z)(2)cos theta, where a, L, and z are the radius of spheres, the arm length, and the swimmer distance to the wall, respectively. The wall-induc...

Effect of Reynolds Number in the Turbulent-flow Range

a critical analysis of ideology in discourse: the case of “the chrysanthemums” by john steinbeck تحلیل انتقادی ایدئولوژی در گفتمان: بررسی ’ گلهای داوودی’ اثر جان اشتاینبک

چکیده امروزه‚ اعتقاد بر این مطلب که زبان تنها ابزاری جهت برقراری ارتباط نبوده‚ بلکه وسیله ای در جهت شکل گیری هویت‚ ارزش ها‚ وایدئولوژی های اعضای جامعه می باشد به طور گسترده ای فراگیر شده است. بنابر این‚ گفتمان ها بی تاثیر از ایدئولوژی پدید آورندگان نبوده و متعاقبا بر درک خوانندگان یا شنوندگان از حقیقت تاثیرگذارند. فیرکلاف (2003) بر این باور است که گفتمان ها به واسطه ایدئولوژی غالبی که در خود د...