ترجمه مقاله Herd Behavior in emerging equity markets: Evidence from Vietnam
Kso= [Fe3+] [OH-]3 = 10-39
Solubilities of metal hydroxides:
If one leaves an orange solution of a ferric salt to stand, after a while it will clear, and an orange precipitate of Fe(OH)3(s) will form. The extent to which Fe3+ can exist in solution as a function of pH can be calculated from the solubility product, Kso. For Fe(OH)3(s) the expression for Kso is given by:
Kso = [Fe3+] [OH-]3 = 10-39 [2]
One thus finds that the maximum concentration of Fe3+ in solution is controlled by pH, as detailed on the next slide.
Note that we need [OH-] in expression 2, which is obtained from the pH from equation 3.
pKw = pH + pOH = 14 [3]
Thus, if the pH is 2, then pOH = 12, and so on. pOH is related to [OH-] in the same way as pH is related to [H+].
pH = -log [H+] [4]
pOH = -log [OH-] [5]
So, to calculate the maximum concentration of [ Fe3+ ] at pH 6.4, we use eqs. [3] to [5] to calculate that at pH 6.4, pOH = 7.6, so that [OH-] = 10-7.6 M. This is then used in equation [2] to calculate that [Fe3+] is given by:
Problem. What is the maximum [Fe3+] at pH 6.4?
From the previous page, at pH 6.4 we have [OH-] = 10-7.6 M. Thus, putting [OH-] = 10-7.6 M into equation 2, we get:
10-39 = [ Fe3+ ] x [ 10-7.6 ]3
[ Fe3+] = 10-39 / 10-22.8 = 10-16 M
Note that for a metal ion Mn+ of valence n that forms a solid hydroxide precipitate M(OH)n, the equation has the [OH-] raised to the power n. For example:
Pb2+ forms Pb(OH)2(s): Kso = 10-14.9 = [Pb2+] [OH-]2
Th4+ forms Th(OH)4(s): Kso = 10-50.7 = [Th4+] [OH-]4
شامل 11 اسلاید powerpoint
این فایل حاوی مطالعه Behavior, Modeling and Design of Shear Wall-Frame Systems (رفتار، مدلسازی و طراحی سیستم های دیوار برشی) می باشد که به صورت فرمت PowerPoint در 150 اسلاید در اختیار شما عزیزان قرار گرفته است، در صورت تمایل می توانید این محصول را از فروشگاه خریداری و دانلود نمایید.
فهرست
The Basic Issues
Shear Wall – Common Misconceptions
Shear Wall and Frame Interaction
The Basic Behavior of Shear Walls, Frames and Shear Wall-Frames
Basic Modeling Options for Shear Walls
Modeling of Shear Walls In ETABS
Design of Shear Walls
Slenderness of Columns
تصویر محیط برنامه
Spirituality, religion and suicidal behavior in a nationally representative sample
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• مقاله با عنوان:
Analytical Study on the Important Parameters Effective of Cyclic Behavior of Reduce Beam Section Moment Connections
• نویسندگان:
R.Rahnavard , N.Siahpolo
• محل انتشار: هشتمین کنگره ملی مهندسی عمران - دانشگاه صنعتی نوشیروانی بابل - 17 و 18 اردیبهشت 93
• محور: سازه های فولادی
• فرمت فایل: PDF و شامل 7 صفحه و زبان مقاله انگلیسی می باشد.
چکیــــده:
The recent earthquake have been shown steel moment frame (SMF) with weld connections are so brittle. According to researches, the more damage were due to cracking of the weld between the beam flange and the column face and induced concentrated stresses in this area. A useful approach to reduce the stress concentration at the panel zone is using of reduce beam section (RBS). Given the enormous impact of seismic behavior and ductility of the panel zone, RBS moves plastic hinge formation at appropriate distance from column face. In this study, two bolted moment connections and welded connections, in both ordinary SMF and RBS, have been modeled and compared with each other during cyclic behavior by numerical method. This study show that the RBS connections are increased 25% and 30% the ductility of beam and panel zone on bolt moment connections and weld moment connections respectively.
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