A more general form of this question has been answered  for example, but I want to know what makes a good poster presentation in physics and/or engineering conferences.  Obviously the poster must be visually appealing as discussed in various posts here, but I have seen cases where the most stunning posters (looks really good and well-written) did not win poster prizes when judged by professors at the conferences. Can you give reasons as to why this happens? Are there some special conditions or requirements in physics/engineering for such presentations?
Should one create slides similar to those that one uses in a good powerpoint presentation? Or are there things that a poster should include that a powerpoint should not include? (and vice versa)
Prove that, $f'(0) \ge -\sqrt{2}$ for a function $f$ satisfying some conditions on $(-1,1)$. Let $f:(-1,1)\to \mathbb{R}$ be a twice differentiable function such that, $f(0)=1$, $f'(x)≤0$, $f(x)≥0$ and $f''(x)≤f(x)$ for all $x≥0$. Prove that, $f'(0)≥-\sqrt2$   Progress: I was able to prove $f'(0)≥-2$. For this I have applied Cauchy MVT for $f'$ and $g$ on $[0,x]$ for any $x\in (0,1)$ where $g: [0,x]\to\mathbb{R}$ is defined by, $g(x)=\sqrt{x+1}$. But, couldn't find another approach to get $-\sqrt{2}$. error: file '/grub/i386-pc/normal.mod' not found error: file '/grub/i386-pc/normal.mod' not found. grub rescue&gt;   What can I do? I just sit and stare at it.   I found my old netbook (Dell Inspiron 1010) which I have not used for about four years. I replaced Windows XP with Ubuntu 12.10. I used my bootable USB drive. I installed and rebooted. I got the message that normal.mod is not found.   What should I do? Type exit, reboot, or quit? Should I re-install? How to render lightning in Cycles How can you render a lightning bolt using Cycles? Limit as $x\to 0$ of $\frac{(1+x)^{1/x}-e}{x}$ For example: man(1), find(3), updatedb(2)?   What do the numbers in parentheses (Brit. "brackets") mean? Aristotle's Categories with academic commentary How to Avoid Precision Errors While Creating Numpy Arrays? Separability over intersection of intermediate fields Let $E\mathop{/}F$ be a finite-degree normal extension of fields. Let $K$ and $L$ be intermediate fields (that is, $F\subseteq K\subseteq E$ and $F\subseteq L\subseteq E$) such that $E$ is separable over both $K$ and $L$. Show that $E$ is separable over $K\cap L$.   So I was thinking that if $f=\min_{K\cap L}(\alpha)$. Then $\min_{K}(\alpha)$ divides $f$. But if $f$ has repeated roots then I don't see what goes wrong.   Thanks! Why was mixing declarations and code forbidden up until C99? C++ cast syntax styles Are there rules for using manacles in combat? I can't quite find in the PHB or DMG how to slap manacles onto someone during combat. PHB 152 describes how to break out of mundane manacles, while DMG 165 shows how Dimensional Shackles work (they are essentially magic manacles -- use 1 action to bind an Incapacitated target).  Is there an official rule on how to use manacles in combat, or do we have to use house rules? a function or a factor to scale a list of real numbers from one range to another Limited options in a certain area? Ok so i am a bit of a noob in blender, so I need help with this.  I am trying to texture something, but there is no texture button where there should be, because the blender edge window cuts it off here's a picture How do you print the current month, day and year using awk and date? I can't seem to grab the month, day and year using   awk '{print $2, $3, $6}' date    Does anyone know how to? How do you get JavaScript/jQuery Intellisense Working in Visual Studio 2008? I thought jQuery Intellisense was supposed to be improved with SP1. I even downloaded an annotated version of jQuery 1.2.6, but intellisense will not work in a separate jscript file. I have the jQuery library referenced first on my web page in the &lt;head> tag. Am I doing anything wrong? Logarithmic y-axis and restrict y to domain fails I'm trying to plot data with a logarithmic y-axis and restricting the y-data to a specified domain, but compilation fails for a reason I don't understand. This is the code:  \documentclass{standalone} \usepackage{pgfplots} \begin{document}% \begin{tikzpicture} \begin{axis}[ymode=log, restrict y to domain=1:6] \addplot coordinates {(0, 1.1e1) (1, 1.7e3) (2, 0.0e0) (2, 3.4e7) (4, 8.1e5)}; \end{axis} \end{tikzpicture} \end{document}   Running it results in an error message:  ! Missing number, treated as zero. &lt;to be read again&gt;                     i l.6 ..., 1.7e3) (2, 0.0e0) (2, 3.4e7) (4, 8.1e5)};   According to the pgfplots manual for version 1.5.1 (29 December 2011), page 272 (about restrict x/y/z to domain), For logarithmic axes, min and max are logs of the respective values. If I disable either the logarithmic y-axis or the domain-restriction, the code runs successfully and output is as expected (but not as desired).  Software versions:   pdfTeX, Version 3.1415926-2.3-1.40.12 (TeX Live 2011) (format=pdflatex 2012.5.30) pgfplots 2011/12/29 v1.5.1 (git show 1.5.1-4-g53e640f )  tikz 2010/10/13 v2.10 (rcs-revision 1.76).   What's going on? What am I doing wrong? Or is this a bug? A question about the arctangent addition formula. In the arctangent formula, we have that:  $$\arctan{u}+\arctan{v}=\arctan\left(\frac{u+v}{1-uv}\right)$$  however, only for $uv&lt;1$. My question is: where does this condition come from? The situation is obvious for $uv=1$, but why the inequality?  One of the possibilities I considered was as following: the arctangent addition formula is derived from the formula:  $$\tan\left(\alpha+\beta\right)=\frac{\tan{\alpha}+\tan{\beta}}{1-\tan{\alpha}\tan{\beta}}.$$  Hence, if we put $u=\tan{\alpha}$ and $v=\tan{\beta}$ (which we do in order to obtain the arctangent addition formula from the one above), the condition that $uv&lt;1$ would mean $\tan\alpha\tan\beta&lt;1$, which, in turn, would imply (thought I am NOT sure about this), that $-\pi/2&lt;\alpha+\beta&lt;\pi/2$, i.e. that we have to stay in the same period of tangent.  However, even if the above were true, I still do not see why we have to stay in the same period of tangent for the formula for $\tan(\alpha+\beta)$ to hold. I would be thankful for a thorough explanation. I have the following validation rule:  AND(  $Profile.Name &lt;&gt; 'System Administrator',  OR(  ISPICKVAL(PRIORVALUE(Level__c), "Archived"),  ISPICKVAL(PRIORVALUE(Level__c), "Closed")  )  )   This validation rule is on the opportunity object, and what I want to achieve is, if the picklist Level__c is either set to Archived or Closed, the opportunity record can only be edited by the System Administrator.  For some reason though, the validation rule also triggers, when I want to set the Level__c to Archived or Closed. But this is not what I want.   Any idea what's wrong with the validation rule? Moderators accepting answers on user's behalf after a certain time period Why do we say there is an overall negative charge on the intracellular side of the plasma membrane at rest, and an overall positive charge on the extracellular side when both potassium and sodium are positively charged ions, and they are in relatively equal amounts on either side? It seems to me that both sides should be positively charged, and I can't get my head around it.