Standard Definition and 1000 Threads

Loll will deliver three one-hour talks at Oporto in mid July Here's the abstract Renate Loll, Quantum Gravity from Causal Dynamical Triangulations Abstract: I discuss motivation, implementation and results of the nonperturbative approach to quantum gravity based on Causal Dynamical...

Hello! My teacher gave the following problem.. I am pretty confused as to where to start from... can anyone help? Find the standard matrices for the derivative and integral operators for polynomials up to degree 4. Use vectors of length 5 to represent the polynomials Thanks in advance...

If Z is a random variable having the standard normal distribution, find P(Z\geq-.79) So I punch it into my calculator nmcdf(-.79,infinity,0,1) & I get the answer .7852 The book however has the answer .2148 (essentially 1-ans). Which is what I don't understand... Have I forgotten something...

M theory is an 11 dimensional theory which in some limits can reproduce all the five 10 dimensional string theories, and also 11D supergravity in some other limit. The mantra of string theory has been, for years, "we do not know what M-theory is". On the other hand, 11 dimensional space is...

but only knowing the previous standard deviation, the previous mean (and the sample to be removed). does anyone know how to do it?

I can't seem to get an equation for this reaction.Potassium Biphthlate + Sodium Hydroxide give me what? Both are dissolved in water. Need to figure out the equation to standardize the sodium hydroxide. NaOH + KHC8H4O4 -->All are aqueous. EDIT: read the sticky right after posting, sorry will...

I'm kinda confused about how standard candle works. I know they use type 1 supernovae since their luminosity is the same everywhere but how do scientists know how far a star is if their luminosity is the same everywhere. I don't really get how they measure distance with it. Can someone please...

[SOLVED] indentation standard http://en.wikibooks.org/wiki/LaTeX/Document_Structure It says there that "By default, the first paragraph after a heading follows the standard Anglo-American publishers' practice of no indentation." I have never heard of this so-called standard! Has anybody...

Change the equation to standard form. y = x^2 + 8x + 20 I thought this was the standard form for parabolas?? I tried this as the answer but it said it was wrong y = (x+4)^2 +4 Thanks for the help! :-)

Homework Statement This is not a problem, per se, because it is part of my Lab. We're calculating the standard enthalpy change of formation for solid Ammonium Chloride. To do this, we're using four separate rxns, and totaling their individual standard enthalpy change of formations. For two...

We need a stickythread that makes this point. Prominently so it catches newcomers' attention. Otherwise questions about it keep coming up. If anyone wants to try saying this in an especially clear way, please go ahead. Everybody I can think of has made this point----the mods, the professional...

Hiya, I've just done a line integral question, and the final part of the question is, "by applying a standard test, determine whether the value of the line integral depends on the path followed between the given initial and final points." The only standard test, I know, is dq/dx, and dp/dy to...

Where can I get a list of standard sizes for I beams? (Preferably in SI units, just to save me time)

Can someone point me to good books or good web links that deal with standard light sources (standard lamps to be precise) used in spectroscopy?

Homework Statement Write the half-reactions and the overall reaction for the oxidation of water by F2. Determine the standard potential and DeltaGr(0). Homework Equations I can manage the half-reaction and the overall reaction should be: 2 H2O + 2 F2 = 4 HF + O2 The Attempt at a...

Has anyone read this paper? Shifting the Universe: Early Dark Energy and Standard Rulers Authors: Eric V. Linder, Georg Robbers Comments: 6 pages, 3 figures Subjects: Astrophysics (astro-ph) The presence of dark energy at high redshift influences both the cosmic sound horizon and the distance...

is there a time operator (not the time evolution operator) in standard qm? I'm a bit curious as while it might not matter all that much for non-relativistic qm it seems as if it would be important to have some measure of a the probability that a particle is at a given place and time. If I...

I take it that the standard basis vectors of C^n is the same as the standard basis vectors of R^n? It would seem so as scalars in C^n are complex numbers.

At this point, i am not yet convinced that enough data is in on the subject of dark matter/dark energy to support expansion of the standard model to include them, but, then, i am just a lowly layperson... How do you guys see dark matter and dark energy fitting into the standard model? how...

[SOLVED] What are the standard units for inertial mass and gravitational mass? 1. What are the standard units for inertial mass and gravitational mass? And also apparently gravitational mass can be measured without gravity how can it be done? Thank you very much. My teacher said a hint is in...

So, what will we see at the LHC if the Standard Model is all that there is to physics at this energy scale? What if there is no supersymmetry, no strings, no loops (or at least no emergent behavior that would be seen here)? Are we going to be able to tell if those theories are false pretty...

I'm trying to solve some organic chem reactions out of a new textbook with an answer key that's confusing me. All three rxns involve anti-markovnikov addition of HBr to an alkene using a peroxide. A peroxide radical generates a bromine radical, the electrophile which then adds to the least...

In doing a problem, I considered N (a large number, in the range 100,000-1,000,000) raindrops, falling into A (fixed at 100) segments on a roof, distributed using a random number generator I programmed. In considering the number of raindrops that fell into a given segment, the average would be...

Hi there, can anyone shed some light on regenerative gas turbine cycle. How to work problems of this sort. DATA: compressor intake: 0.95 bars @ 22 `C pressure ratio 6:1 (compressor), 82% efficient turbine inlet: 1100 K. 85% efficient. regenerative effectiveness: 70% Intercooling...

There is a bit of data and literature that shows the standard heats of formation for various uranium compounds including UO3, U3O8 UF6 etc. However there appears to be nothing on ammonium diuranate which is one of the most common intermediate forms produced by precipitation. The ADU as it is...

Just looking for ideas if it does. I've looked at closed string tachyon condensation and it apparently excites the graviton as it's also closed string and this can warp spacetime. I (think) see a flaw in symmetry here as if I were on earth, feeling the gravitational field strength, I'd...

You are given a chance to fly back in time with no worry over changing history in bad ways. Knock knock and you enter a college looking for famous Isaac Newton, age 45, in person. He's a real fun in every way - mechanics, theory of gravity, celestial mechanics, calculus, the queen. Also he...

Homework Statement Suppose a sample containing 0.600 ppm Selenium is analyzed by a method for which the standard deviation of the population is known to be 0.005 ppm. 1) What is the the probability that a single determination would return a value less than 0.590 ppm? 2) What is the probability...

in my analytical chemistry review, this question cropped up. the first part was simple, but the second part has me confused to no end. I've tried playing around with the math as well as scouring my textbook for answers. help! what is the probability that a single determination of a value is...

There are two different problems that I am confused with: 1) The taste of mature cheese is related to the concentration of lactic acid in cheese. Use the concentrations of lactic acid in 30 samples of cheddar cheese on page 15. Well, what's important is that using all the numbers it gave...

Hi, I work with valves and one of our customer send me an oring specification. this file says that the index (or coefficient) of cold is -50°C and it was measured with differential scaning as per VNA 675116. I have never heard something about it. thanks

hi, just wondering if there different ways to calculate the standard error for large and small sample size and if its so wats the formula we use? please give me a hand, hope this question makes sense. cheers

[SOLVED] Standard error Homework Statement A student determined the following values for the wave speed; calculate the average value of the wave speed and its standard error 50.8, 50.6, 51.8, 52.0, 50.9, 51.6, 51.3, 51.5 Homework Equations avg wave speed = 51.3 The Attempt at a...

Sometimes, when repeated assays are to be performed, the sample size is standardized and chosen such that the ultimately measured quantigy is numerically equivalent to some other desired proportionate quantity. suppose the sulfur content of a mineral sample is determined by complete...

[SOLVED] Quick question about finding standard deviation Now I know that \sigma=\sqrt{var(x)} which simplifies to this expression : \sigma=\sqrt{\frac{1}{N}\sum_{i=1}^{N}(x-\overline{x})^2} can someone show me how they got such an expression? and in chemistry I have to use a standard...

I was looking at a page in wikipedia about well-known theoretical physicists, i stumbled across the physicists Dimitri Nanopoulos and John Ellis. It mentioned that they both worked together to unify string theory and the standard model and quote Does anyone know if they were successful in...

dark matter/virtual particles in standard model?? where do dark matter, dark energy, and virtual particles fit in the standard model? if those three mystifying concepts are necessary to explain the universe and its operation, why are they not included in the standard model? IMHO, all three...

Greetings! This is for a Chilled water piping project (1000mm dia max). We are procuring pipes from SEAH Korea, from 250mm to 1000mm. And for calculations for support, load, thrust, etc, i need the following details for these pipes. 1. Coefficient of Linear Expansion 2. Longitudinal Elastic...

Homework Statement For this set of data find the mean and standard deviation Temp...# of days 90-94...1 85-89...3 80-84...6 75-79...12 70-74...7 65-69...1 2. The attempt at a solution I don't know how to find the mean or standard deviation when the data is divided into...

this is my question , i just don't know how to get the standard enthaply of reaction of this problem iam sure its easy, but i just don't get it, any help is welcome 14. Given the reactions (1) and (2) below, determine (a) ΔrH and ΔrU for reaction (3), (b) ΔrH for both HBr(g) and H2O(g)...

Homework Statement The mean height of players in a basketball competition is 184 cm. If the standard deviation is 5 cm, what percentage of them are likely to be: a) taller than 189 cm b) taller than 179 cm c) between 174 cm and 199 cm d) over 199 cm cm tall? Homework Equations...

Do large dams have a standard design, like that of horizontal and vertical curvatures (such as width vs. depth)?

standard derivation?? I read in a paper that the "light clock" approach is a standard derivation of the time dilation formula. Please let me know when do we consider that a derivation is a standard one?

We are pinning high hopes on LHC experiment. One of the expected results of the experiment is detection of Higgs Boson that would complete the standard model. In fact, discovery of Higgs Boson would complicate the theoretical issues because then we will need to find out.. a. origin of Higgs...

Hi. What's a standard reference for physicsts concerning the topic of fluid dynamics or computational FD.

Calculate the potential (voltage) of a standard cell with these half-cell reactions: Ni(s) -----> Ni2+ + 2 e- 2 e- + Cl2(g) -----> 2 Cl- :cry:

Any one have any opinions on the differences between these two language (and their closeness to C)... chroot posted about python being almost as complete as java interms of standard libs. I attended a presentation which seemed to verify that claim though you have to download some of the added...

Homework Statement Given variables in one coordinate system, give the notation used to refer to the variables in another system. The known variable is x Homework Equations The transformation is an arbitrary one. My question has to do with notation and not mathematical procedures...

Homework Statement 1) If the point (-4, 2) lies on the terminal arm of an angle θ in standard position, determine the exact value of csc θ. 2) If sec θ = -5/3 and angle θ terminates in quadrant III, which point must be on the terminal side of θ? 3) If cos θ = 5/13, where θ is in quadrant VI...

Hi all. If I have a function V(x1,x2,x3,x4) and I want to calculate it's standard deviation when x1,x2,x3,x4 are standard normal and their variances are small, then formula (8) on this page http://www.devicelink.com/mem/archive/99/09/003.html" is an approximation to the standard deviation...