abstract in aggregate, active forms of reactive silica with mineral names are sometimes associated with sand and gravel in concrete mixture. alkali hydroxides originated from alkalis in the cement or other resources form an alkaline silica gel with this reactive silica which becomes swallowed and expanded during time causing damage to concrete. there have been growing researches on alkaline r...

the study of air infiltration into the buildings is important from several perspectives that may be noted to energy and design of hvac systems, indoor air quality and thermal comfort and design of smoke control systems. given the importance of this issue, an experimental and numerical study of air infiltration through conventional doors and windows has been explored in iran. to this end, at fir...

In the holy Quran no mention is made of the marriage of Yusuf and Zulaykhā, but in the compendiums of narrations and exegeses of the two sects there are fourteen narrations about it of which eight are mentioned in exegeses and six in books of traditions. Of course, the exegeses compared to books of narrations are much older. A survey of these narrations shows first that they have been reported ...

the present study was concerned with exploring the frequency and linguistic focus of corrective feedback types given by novice and experienced female teachers working with young learners and compared it with those of elementary classes for adults. moreover, it aimed at measuring learners’ acknowledgement of teachers’ corrective feedback in the form of uptake in relation to linguistic coverage o...

The narrational exegeses are a set of sources which Sheikh al-Kuleini has used in the composition of his …. . Some of these works are those of Hisham Ibn Salim, Yunis Ibn Abdol Rahman, Hussein Ibn Saeed, Abu Hamzeh al-Thomali, Mo’lla Ibn Muhammad, Muhammad Ibn Khalid al-Barqi, Wahib Ibn Hafs al-Jariri …. Muhammad Ibn Hassan…., Abdol Rahman Ibn Kathir, and some of the ...

in the present work, a simple and sensitive method was developed for determination of morphine and heroin using gold nanoparticles as resonance rayleigh scattering (rrs) and colorimetric technique’s probe. synthesized gold nanoparticles by sodium citrate reduction method have a negative charge layer on their surfaces because of self-assembled citrate anions on their surface. binding of morphin...

growing demands and requires of high data rate systems cause significant increase of high frequency systems for wideband communication applications. as mixers are one of the main blocks of each receivers and its performance has great impact on receiver’s performance; in this thesis, a new solution for ku-band (12-18 ghz) mixer design in tsmc 0.18 µm is presented. this mixer has high linearity a...