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تعداد نتایج: 12106266 فیلتر نتایج به سال:
kilka fish are known as the main industrial and pelagic species of iran that are captured abundantly in the southern caspian sea. this study was conducted to survey the effectiveness of refinement steps on kilka (clupeonella delicatula) crude oil quality and fatty acid profiles. neutralization, bleaching, winterization and deodorization were performed on crude oil with deodorization done under ...
Synthesis of novel pyrazole-fused heterocycles, i.e., dihydro-1Hor 2H-oxepino[3,2c]pyrazoles (6 or 7) from 4-allyloxy-1H-pyrazoles (1) via combination of Claisen rearrangement and ring-closing metathesis (RCM) has been achieved. A suitable catalyst for the RCM of 5-allyl-4allyloxy-1H-pyrazoles (4) was proved to be the Grubbs second generation catalyst (Grubbs2nd) to give the predicted RCM produ...
This study aims at investigation of the hydrogen damage after dissolution annealing and two-stage aging in aluminum 7075 alloy. Dissolution annealing was performed at 500 to 575 °C for duration of 1 to 20 hours. The first stage of two-stage aging was performed at 180, 200 and 220 °C for 30 minutes. The second stage was carried out at 120 and 150 °C for 10, 15 and 20 hours. Structura...
Torrefaction kinetics of Norwegian biomass fuels, including spruce (softwood) and birch (hardwood) was studied using a thermogravimetric analyser. Small samples of approximately 10 mg and particle size of 63−125 μm were heated at a constant heating rate of 5 °C/min and kept afterwards for 4 hours in isothermal conditions at different temperatures (230, 240, 250, 260, 270 and 280 °C). A two-step...
Purpose: Present study was designed to evaluate the potential of co-culture systems to overcome deleterious effect of exposure of mouse 2-cell embryos to low temperature. Materials and Methods: 2-cell embryos were flushed from oviduct of super ovulated NMRI mice into HTF medium with 15% BSA. After washing 3 times with HBSS and with 15% BSA, embryos were exposed to laboratory temperature (LT) (...
Solid Oxide Fuel Cells are a promising technology for (SOFC) For high-efficiency electrochemical conversion of vast range fuel gas mixtures, thigh operating temperature conditions (650–900 °C) represent challenge both at system level and laboratory testing level, in terms material properties performance dynamics. In this work detailed procedural analysis is presented an innovative all-ceramic c...
objectives: this study aimed to assess the effect of storage time and temperature on dimensional stability of impressions made with cavex outline zinc oxide impression paste. materials and methods: a round stainless steel mold with five grooves (three horizontal and two vertical) was used in this in-vitro experimental study. cavex outline impression paste was prepared according to the manufactu...
The purpose of the present study was to assess the effect of modified camel milk (MCAM) and skim cow milk (SCOM) on semen quality of INRA180 and Boujaâd ram breeds, stored at 15°C for up to 24 hours. Semen samples were collected from eleven mature rams (6 from INRA180 and 5 from Boujaâd rams) and extended in SCOM vs MCAM, to reach a final concentration of 0.8×109 spermatozoa/mL, and stored at 1...
the aim of this study has been to find answers for the following questions: 1. what is the effect of immediate correction on students pronunciation errors? 2. what would be the effect of teaching the more rgular patterns of english pronunciation? 3. is there any significant difference between the two methods of dealing with pronuciation errore, i. e., correction and the teaching of the regular ...
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