Issues Definition and 407 Threads

I'm struggling to get to grips with the idea that quarks cannot be observed as isolated particles due to confinement and yet existed as free particles during an early epoch after the big bang. Surely quarks aren't actually confined if they can exist at high enough energies. In fact aren't...

I am on an assignment to test the domain of input values of a tachometer, and what output (deflection) different values correspond to. In other words, what's the minimum and maximum signals and what does the curve look like? The trouble is I can't get ANY useful information. The tach has...

Hey all, My bibliography is not showing up in the PDF output, and I'm not sure why.. The bib file is in the same directory as the the main tex file. I am using the command: \documentclass[a4paper,twoside,11pt]{book} \usepackage{calc} \usepackage{setspace} \usepackage{graphicx}...

Hi, Is there anyone who can help me with COMSOL Script? Is there anything wrong with this statement: flclear fem g6=rect2(1.0E-6,11.0E-6,'base','corner','pos',[0,0]); clear s s.objs={g6}; s.name={'CO1'}; s.tags={'g6'}; fem.draw=struct('s',s); fem.geom=geomcsg(fem)...

I'm a second year physics major and I'm considering starting a co-op job doing research starting this summer. The outcome of this is that I would end up graduating in the fall, and my plan after school is to get a PhD. Since hardly any PhD programs start in the spring, I'd have a good 9 months...

I just won my grant application (just for a mini-internal grant offered through our university's "Innovative Technology Center", just enough to give myself and my undergraduate student travel funds) to support our study of our implementation of team-based learning. Yeah! :biggrin: :biggrin...

This is just a basic incline plane problem. I know how to do it, but these sign conventions and vector issues are what confuse me. I know that I align my coordinate system so the x-axis is basically the surface the block is resting/moving on, the net weight vector of the block will be directed...

The question is Find the Macluarian Series for f(x)= cos x. Not a hard problem. What I'm having an issue with is Maclaurian series over all. I don't really understand them and how to use them. Our textbook discussion on it is not very helpful either. Can anyone point me in the right direction...

Can someone please help me converting grades from percentage to the letters system? In the states if I'm not mistaken: 95-100:A+ 90-94:A 85-89:B+ 80-84:B 75-79:C+ 70-74:C 65-69:D+ 60-64:D below that you get F. Is this correct? Anyone knows how it goes with colleges and univs at...

I bought a fairly cheap wireless mouse a while back. With the batteries it came with it lasted quite some time, at least a few months, before it died. I bought new batteries from the store that were on sale and put one in. About a week later I found that the usb plug had come detached from...

my power supply for the computer has just burnt resently for the second time in less than twom weeks i obviously have to buy anothr one but am a bit hesitant cause i can't figure out y they keep burning nd the fault is not with my plugs please help wer u can...!:biggrin:

Hey everyone, Having some trouble here using the solver we were supplied and modifying it to fit our problem... I have a wire with a current flowing through it. I'm trying to find the temperature distribution wrt. position in the wire. BV's are: T(x=L/2) = 300K dT/dx (x=0) = 0 (Apparently...

Integration Issues...a bit urgent Hey having problems with five of my assignment questions, any help would be appreciated. Homework Statement (problems attached) Homework Equations The Attempt at a Solution For the first one, I tried to solve it by using the sin-1 x as 'u'...

I'm working with a couple different diode lasers, attempting to automate control of them (on and off mainly) by modulating the source currents externally. One of them is a green laser that draws ~1.4A, 3.3V but has no modulating chip in the power line. I've got another smaller red laser module...

[SOLVED] latex question When I compile that with the texnic center, the numbering the bibliography is messed up. Does anyone know why?

Homework Statement The problem asks me to express the sum of the series as a telescoping sum, then find whether it is convergent or divergent. Ok, I get that and how it works and all, but the examples they give in the book are stupid and i on spring break this week so no office hours for...

It's been a year or two since I gave up, so I guess I'll subject myself again. Why am I unable to add funds to a Paypal account from a Credit card? It's like it has never occurred to them that anyone might want to do this. I am not about to attach my bank account information to anything...

Hello, I am making a circuit which runs a large current through a material at intervals, heating it, which then temporarily stops to make a resistance measurement. Each individual circuit is not an issue in itself, nor the timing of it since I have a computer interface which can grab analog...

That is the question at hand and it's for a first year biology course. I have my sources and I have my opinions on the matter, but a lot, if not all, of my sources are popular sources from magazines or mainstream science sites. I was wondering if anyone knew any journal articles in academic...

[SOLVED] Computer Help! When i minimize any of the windows it just dissapears and does not show on my taskbar! Any help would be great =/

I have some issues with the current understanding of the cosmological red shifts and their interpretation using the spatial variation in the metric with time.To make the argument clear, I'm also posting pictures. The universe is depicted as the surface of a sphere but that doesn't affect the...

I am demoing a lemon battery made with a copper sheet electrode and a galvanized nail for the Zn electrode. I get a voltage of 0.954 volts from the battery which slowly decays over time. Why is my voltage this close to the 1.1 V expected value if my concentrations of copper and zinc ions are...

It may be valuable to consider microalgae as a potential solution to a number of problems; not the least of which being the energy problem. Algae can be used to produce biodiesel, ethanol, and hydrogen, as options to the use of petroleum based fuels...

-------------------------------------------------------------------------------- I am having some issues with this problem... F=( x+y, y+z, z+x) bounded by the plane with vertices at {2,0,0},{0,2,0},{0,0,2} I need to do both sides of stokes thm and I am running into problems when I try...

#1 : A 300g bird is gliding through the air toward the east at 8m/s. A 10gram bug is buzzing along toward the west at 5ms direction toward the bird. The bird opens his mouth and swallows the bug. What is the velocity of the bird immediately after swallowing the bug? Using conservation of...

Something weird is happening to my internet. I have DSL and broadband as a phone company, my router is a d-link. Anyways, a couple of months ago nothing would happen when the phone rang, but now everytime the phone rings and gets turned off (after ending a call turning off the phone), my...

After a brief venture over into the medical/RHP side of things, I find myself drawn back into nuclear engineering. Glad it happened before I got too deep into something else! I've just started working on my MS, and I am trying to find some sort of direction for myself. Anyways, one subset of...

So I made a program that finds files and searches in them for key terms using the scanner class in java.util.*; I've written it something like this: Scanner filereader = new Scanner(System.in); String filename = filereader.nextLine(); Scanner searcher = new Scanner(new File(filename)); The...

Hi ... I learned to program in VB6 (the last version before .NET came out) and am going to use VB to programme a few apps for a project of mine. Now, after doing some research, Microsoft have discontinued producing VB and I've heard that Microsoft are going to stop support for VB in the near...

Hi, I'm building a STM, and this is the circuit I use : http://www.geocities.com/spm_stm/Simple_STM_Rev_C.PDF I'm right now testing the circuit I build. I build a small part (U3A), and then test it, and build another small part (U3B) and test, then connect the two and test it again...

Hi Ho! When someone would like to implement a multiprogramming in a computer system, what kind of issues related to I/O does he have to consider? Is there any difference between the implementation of multiprogramming in the system that uses interrupt driven I/O and the system that uses DMA...

I have an academic planning issue. Since I never had any interest in mathematics or mathematical sciences in high school, I never took a course past Algebra/Trigonometry, and didn’t pay attention to any of my physics or chemistry courses. After I graduated high school, and started to read a lot...

Hi all, I know this post topic does not really resemble any of the other threads in this subforum, but it is the most suitable place I could find. Anyway, I am currently enrolled in a class entitled "Ethics and Tech Profession." Part of the requirements is to write a paper in which I...

I got a problem with ultra high vacuum system, and would like to know some advice. A UHV chamber just moved to the lab, and I cleaned it with aceton, put the ion pump indside and sealed all the ports, and I've been pumping the chamber for like 3-4 or 2-3 weeks. I leak tested it by a helium...

my dvd writer seems to have gone mad. i burned 5 sony dvd's first n they all were fine, then the next one got thrashed and then 2-3 dvd's got wasted. again few next dvd's were fine. all my dvd's were of sony. things continued. now i have about 10-12 fine working dvd's and same number of "REALLY...

I'm generating a graph in gnuplot, using the postscript enhanced terminal setting, and trying to use symbols in the axes labels, then import the ps file into a latex document. The trouble I'm having is that the symbols in the ps document, don't show up properly in the final document after the...

Sorry for wordiness, the power problem is probably simple... Im a CSE student working on a team trying to create an IBM 704 emulator. It's a big headache, but all that aside, one of our components is a Vortex86 pc104 compatible single board computer...

My friend's p/c is unoperatable, she gets a notice stating mouse not connected. How can we correct this, thank you.

So I just salvaged the HD from my laptop which just imploded itself, it still works and all (I have it connected to an enclosure and USB'd into my computer), but I can't get my files off of it. It keeps saying that the access is denied, and I realize this is a microsoft privacy thing, but is...

Hi, I'm currently making a hydrophone and I'm planning to use a piezo crystal as a sound receiver whose output I then intend to put through an op-amp. Berkeman recently raised an interesting point about voltage issues with op-amps so I thought I'd pose this question before proceeding any...

Hello, my colleague has a problem. He has a Monte Carlo simulation written in C. But his program gives different outputs in case he compile it using g++ or icc. He has nothing changed in his source. He is using standard random number generator drand() with initialization srand((unsigned) time...

Just a warning, my laptop came with mcafee and windows vista installed, once i had registered mcafee my internet speed dropped to a crawl (even with mcafee protection turned off), the only way i could get my internet speed back was to uninstall mcafee, do people not test compatibility issues?

Recently I have upgraded my pc with as new video card, I'm left with the old one which is Geforce5200FX, it has 256MB SDRam, I have an older pc , with 815 Intel motherboard.. what I read about the specs that the video card should be no more then 64MB... my question is it safe to install the...

Poverty is the state for the majority of the world’s people and nations. Why is this? Is it enough to blame poor people for their own predicament? Have they been lazy, made poor decisions, and been solely responsible for their plight? What about their government? Have they pursued policies that...

My first assignment in chemical engineering basics class, and already I am having the problems! Homework Statement A horizontal cylindrical drum is 2m in diameter and 4m long. The drum is slowly filled with benzene (density = 0.879g/cm^3). Derive a formula for W, the weight in Newtons of...

Hey everyone! I am new here and I need MAJOR help on an experiment. It's grade 12 university prep Chemistry course that I am doing via correspondance. Basically I have read through equillibirum notes (Like 20 pages worth and I am VERY confused). I get the basic idea but am still haveing a tough...

Homework Statement I have been told: Two variables x and n are connected by the formula x=a( n^b). When n = 2, x = 37; when n = 3, x = 66. I have been told to find a and b. Homework Equations x=a(n^b) (I've put the brackets there because I don't know how to differenciate between...

Finding the Spring Constant -- Help! Algebra Issues! Molecular bonds can be treated like springs. From the vibrational frequencies of the bonds, one can determine the appropriate spring constants. Hydrogen, H2, has a vibrational frequency of 1.3192 X 1014Hz. Deuterium, D2, is an isotope of...

In electromagnetism, when there is an emf is induced in a secondary coil from a current flowing in a nearby primary coil (such as in a transformer), then how is the mutual inductance, number of turns of each coil, the current in the primary coil, and the emf in the secondary coil related...

We had an initiative that will prevent government seizures of property, via eminent domain, for purposes private development. I really liked seeing that one. A big fat aye for that one! I have a new approach to law and order taxes. I have always supported taxes for law enforcement, but I...