content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Accuracy improvement of quantitative analysis in laser-induced breakdown spectroscopy using modified wavelet transform
« journal navigation
Accuracy improvement of quantitative analysis in laser-induced breakdown spectroscopy using modified wavelet transform
Optics Express, Vol. 22, Issue 9, pp. 10233-10238 (2014)
h... | 4 | [
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find all possible values
Let $a,b,c,d$ positive real numbers such that $a+b+c+d=12$ , and $abcd =27+ab+ac+ad+bc+bd+cd$ find all possible values of $a,b,c,d$
Solution: Given a+b+c+d=12 and abcd=27+ab+ac+ad+bc+bd+cd then a,b,c and d =? let a=b=c=d=3 then 3+3+3+3=12 LHS => abcd=3*3*3*3=81 RHS=> 27+3*3+3*3+3*3+3*3+3*3+3*3... | 4 | [
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Invert expression to find the Chemical potential of an Ideal Bose Gas
February 27th 2011, 11:26 AM #1
Member
Joined
May 2008
Posts
106
Invert expression to find the Chemical potential of an Ideal Bose Gas
Hi I'm having trouble with this step of the derivation of the chemical potential for an ideal fermi ... | 4 | [
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Projectile Motion Question #2
February 13th 2011, 01:16 PM
ksinger
Projectile Motion Question #2
I'm stuck on how to approach these 2 problems - any hints would be much appreciated!(Headbang)
1.
A body is projected form a point O on horizontal ground with velocity of 70m/s. It passes through a point P, w... | 4 | [
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Patent US3250133 - Differential accelerometer
May 10, 1 966 P. H. SAVET 3,250,133
DIFFERENTIAL ACCELEROMETER Original Filed June 27. 1960 2 Sheets-Sheet 1 FIGI.
Z??? FIGZ INVENTOR: BY PAUL H. SAVET ATTYS.
United States Patent 3,250,133 DIFFERENTIAL 'ACCELEROMETER Paul H. Savet, Westbury, N.Y., assignor to American B... | 4 | [
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Solve in R
Solve in R : $\left( {x^x } \right)^2 = 8$
Interesting question, I said $x^x = \sqrt{8}$ then using trial and error I found $x \approx 1.788454$
$x^{x}= \sqrt{8} = 2^{3/2}$ $e^{\ln x \ e^{\ln x}} = 2^{3/2}$ $\ln (e^{\ln x \ e^{\ln x}}) = \ln (2^{3/2})$ $\ln x e^{\ln x} =\frac{3}{2} \ln 2$ $\ln x = \frac{\f... | 5 | [
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Camera Works: intermediate f-stop values
The aperture and f-stops article in my ongoing Camera Works series has been popular, but it has also raised some questions. Here's one from Mike S.:
How much ISO would I gain?
I just read your blog on f-stops. Very informative and I learned things I had given up on. I do ... | 4 | [
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Planetary Motion :-)
May 2nd 2008, 09:16 PM
Kipster1203
Planetary Motion :-)
If a planet moves in an elliptical path with sun located at one focus and the ellipse has a major axis of length 10 and a distance between foci of 6. The radius vector from the sun to the planet
sweeps out area at a constant rate o... | 5 | [
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Matrix representation of symmetry operations
Using carthesian coordinates (x,y,z) or some position vector, we are able to define an initial position of a point or an atom.
The initial vector is submitted to a symmetry operation and thereby ... | 4 | [
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Basic Conics Help (elipse)
April 23rd 2006, 03:10 PM #1
Newbie
Joined
Oct 2005
Posts
3
Basic Conics Help (elipse)
Given the length of the semi-major axis, and the distance between the 2 focus, how can I find the length of the semi-minor axis?
kidluff
Given the length of the semi-major axis, and... | 4 | [
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-Stability Analysis for Impulsive Stochastic Neural Networks with Unbounded Mixed Delays
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 746241, 12 pages
http://dx.doi.org/10.1155/2013/746241
Research Article
Global -Stability Analysis for Impulsive Stochastic Neural Networks with Unbounded Mixed Delays
... | 5 | [
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fifth root of unity
February 15th 2011, 07:16 AM #1
Newbie
Joined
Jan 2011
Posts
12
fifth root of unity
apologies if this is in the wrong place, also this is probably the first of many posts on the roots of unity.
Question:
show x^5-1 = (x-1)(x^2 + ((1+sqrt5)/2)x + 1)(x^2 + ((1-sqrt5)/2)x + 1)
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Geometric Sequences 1
February 26th 2013, 04:19 PM #1
Member
Joined
Feb 2013
From
Canada
Posts
131
A ball is dropped from a height of 3 m. After each bounce it rises to 75% of its previous height.
a) State t1 and r: t1 = 3 m r = 0.75
b) Write the general term for the sequence:
tn = (t1)(... | 4 | [
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Average rate of change
September 15th 2009, 12:34 AM #1
Member
Joined
Sep 2009
Posts
83
Average rate of change
I am unsure as to which forum to put this in. I took a shot and put it here, apologies if wrong.
Okay, to the question I am having trouble with.
"Find the average rate of change of $f(... | 4 | [
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Ensuring data integrity in a noisy world
A CRC is generated through a calculation that’s done on the data and then transmitted with the data. The receiver can do the same calculation and then compare the CRCs. If the CRCs match, the data is
most likely good. Many communication schemes use CRC because it’s easy to imple... | 4 | [
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IVP Undetermined Coefficients
November 14th 2007, 05:38 PM #1
Junior Member
Joined
Sep 2007
Posts
51
IVP Undetermined Coefficients
Solve by using Undetermined Coefficients:
y''+y=e^x+x^3 , y(0) = 2 , y'(0) = 0
so I found r to equal + i which gives the first particular solution
y(x) = C1*cos... | 4 | [
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Patent US8036972 - Option pricing model for event driven instruments
FIELD OF THE INVENTION
The present invention relates to methods and systems for valuing event driven option contracts.
DESCRIPTION OF THE RELATED ART
Options contracts or options give their owners the right but not the obligation to buy, in the cas... | 4 | [
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Patent US5956220 - Adaptive distance protection system
FIELD OF THE INVENTION
The present invention relates generally to the field of protective relaying, and more particularly to an adaptive distance protection system.
BACKGROUND OF THE INVENTION
The well-known principles underlying distance relaying are that the i... | 4 | [
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Is the radius of the circle greater than 3?
Author Message
TAGS:
Is the radius of the circle greater than 3? [#permalink] 19 Nov 2010, 03:33
1
This pos... | 4 | [
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Central limit theorem
January 24th 2013, 05:27 AM #1
Super Member
Joined
Sep 2008
Posts
607
Central limit theorem
25 children in a class each roll a fair die 30 times and record the number of sixes they obtain. Find an estimate of the probability that the mean number of sixes recorded for the class is le... | 5 | [
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Math Help
November 28th 2009, 07:17 AM #1
Member
Joined
Oct 2009
Posts
80
derivatives
Can someone help me out with this questions? I am completely lost.
A) If y=ln{x+(x^2-a^2)}, evaluate dy/dx, expressing your answer in its simplest form.
Show that (x^2 - a^2) d^(2)y/dx^2 +x(dy/dx)=0
Last... | 5 | [
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Patent US8165189 - Dirty paper precoding with known interference structure at receiver
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Application No. 60/724,941, filed Oct. 7, 2005, the disclosure of which is hereby expressly incorporated by reference in its entirety, an... | 4 | [
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Fluid Dynamics in a Teniente Type Copper Converter Model with One and Two Tuyeres
Advances in Mechanical Engineering
Volume 2013 (2013), Article ID 902874, 8 pages
http://dx.doi.org/10.1155/2013/902874
Research Article
Fluid Dynamics in a Teniente Type Copper Converter Model with One and Two Tuyeres
^1Department of ... | 4 | [
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Orthonormal basis and linear combinations
May 29th 2008, 04:09 PM #1
Member
Joined
Jun 2006
Posts
93
Orthonormal basis and linear combinations
Let $\theta$ be a fixed real number and let \textbf{x}_1=\left[\begin {array}{cc}\cos\theta\\oalign{\medskip}\sin\thet a\end{array}\right] and \textbf{x}_2=\left[... | 5 | [
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Summary: Homotopies and the Poincar´e Lemma.
Let I = [0, 1] and let T be the vector field on R × Rn
which assigns the vector (1, 0) to each point
of R × Rn
. Let p and q be the projections of R × Rn
on R and Rn
, respectively. For each t R let
it : Rn
R × Rn
assign (t, x) to x Rn
.
Proposition. Suppose is a smooth m-fo... | 4 | [
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Y-Delta conversion for Capacitors
cupid.callin
How do i find impedance of a capacitor?
[tex]Zc = 1/(j\omega C[/tex])
[tex]\omega[/tex] is the operating frequency. The result is in Ohms, and will be an imaginary value.
Don't panic! You don't need to know the frequency for the math to work out; it's a constant for ... | 4 | [
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Integral of a Sum
March 15th 2009, 11:13 PM #1
Member
Joined
Oct 2008
Posts
156
Integral of a Sum
Theorem. Let $a,b,c \in \mathbb{R}$. Let $I$ be the smallest closed interval containing $a,b,$ and $c$ and suppose that $I \subseteq K \subseteq \mathbb{R}$. If $f: K \to \mathbb{R}$ is a
function, then ... | 4 | [
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Help on First order Diff Eq problem
The problem stated that the switch had been previously closed for a while (at rest). So, the cap has been charged to 2V (the same as the source), and there is no more current flowing through the cap.
Then, the switch was opened. The circuit became a "source free" circuit analysis pr... | 5 | [
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0.1015625,
-0.1083984375,
0.033203125,
0.05029296875,
-0.0517578125,
-0.0262451171875,
-0.12060546875,
0.041259765625,
-0.0048828125,
... | 17,427 | 17427 | |
Transition and Transversion on the Common Trinucleotide Circular Code
Computational Biology Journal
Volume 2013 (2013), Article ID 795418, 10 pages
http://dx.doi.org/10.1155/2013/795418
Research Article
Transition and Transversion on the Common Trinucleotide Circular Code
Equipe de Bioinformatique Théorique, ICube, ... | 4 | [
-0.09326171875,
-0.045654296875,
-0.1220703125,
-0.1494140625,
0.0087890625,
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0.031982421875,
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0.072265625,
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0.0087890625,
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0.... | 17,428 | 17428 | |
Patent US6567771 - Weighted pair-wise scatter to improve linear discriminant analysis
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of U.S. Provisional application Serial No. 60/228,638, filed Aug. 29, 2000.
FIELD OF THE INVENTION
The present invention relates to linear discriminant ana... | 4 | [
-0.08203125,
-0.032470703125,
-0.0228271484375,
-0.09375,
-0.017578125,
0.103515625,
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-0.0196533203125,
-0.00982666015625,
-0.00823974609375,
-0.0113525390625,
0.06787109375,
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0.04296875,
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0.0322265625,
-0.005859375,
0.10986328125,
... | 17,429 | 17429 | |
Patent US5128886 - Using long distance filters in the presence of round-off errors
BACKGROUND OF THE INVENTION
The present invention relates to digital filters, and especially to a method of using long digital filters in the presence of round-off errors by prescaling the coefficients and then dividing the
resultant mu... | 4 | [
-0.0361328125,
0.12109375,
-0.01153564453125,
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0.00034332275390625,
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0.032958984375,
-0.0311279296875,
-0.027099609375,
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-0.08984375,
-0.07421875,
-0.014892578125,
-0.0250244140625,
0.0... | 17,430 | 17430 | |
Help!!!
March 14th 2007, 12:57 PM
julie
Help!!!
Henry intends to retire in 14 years and would like to receive $2472 every six months for 19 years starting on the date of his retirement. How much must Henry deposit in an account today if
interest is 6.65% compounded semi-annually?
March 14th 2007, 02:39 PM
... | 5 | [
0.0830078125,
0.033203125,
-0.043212890625,
0.045166015625,
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-0.140625,
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Countable ordinals
March 5th 2010, 05:43 AM
KSM08
Countable ordinals
Can anyone help with the following problem:
If a and b and countable ordinals, prove by induction that a^b is a countable ordinal. (Usual recursive definition of ordinal exponentiation). You're allowed to assume the Axiom of Choice...
... | 5 | [
-0.064453125,
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0.07177734375,
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0... | 17,432 | 17432 | |
Characteristic groups
December 24th 2008, 06:46 AM #1
Junior Member
Joined
May 2008
Posts
33
Characteristic groups
I got stuck with two questions dealing with characteristic groups
the first - G is a finite group characteristically simple and N is a minimal normal sub group in G (contains no proper ... | 4 | [
-0.02294921875,
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-0.00165557861328125,
0.06201171875,
0.0079... | 17,433 | 17433 | |
Motion of a particle in a magnetic field.
October 14th 2008, 01:50 PM #1
Newbie
Joined
Jan 2008
Posts
21
Motion of a particle in a magnetic field.
The only force acting on a particle with charge e and velocity v, in a constant magnetic field B, is ev × B. Also, r(0)=0 and $\dot{\textbf{r}}(0)=\textbf{V}$... | 4 | [
-0.0111083984375,
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-0.07763671875,
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0.000095367431640625,
0.0257568359375,
0.12158203125,
-0.0322265625,
0.0... | 17,434 | 17434 | |
A Parameter Property of Classical Solutions of Cauchy Problems
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 363089, 5 pages
http://dx.doi.org/10.1155/2014/363089
Research Article
A Parameter Property of Classical Solutions of Cauchy Problems
Kent State University at Trumbull, Warren, OH 44483, USA
R... | 4 | [
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Series Question
October 27th 2008, 09:14 PM #1
Series Question
$<br /> \sum\limits_{n = 1}^\infty {\frac{{5\ln n}}<br /> {{\sqrt {n^3 } }}}$
Is there any easy way to find the convergence/divergence of this series?
So far I tried using the integral test and came up with a convergence at 20.
This invo... | 5 | [
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-0.... | 17,436 | 17436 | |
linear algebra - concept proofs
July 29th 2010, 06:48 PM
SpiffyEh
Ok I recalculated and got
[-(4/5)*2^n+ (9/5)*.5^n (6/5)*2^n - (1/5)*.5^n
-(4/5)*3^n- (9/5)*.5^n (6/5)*3^n + (1/5)*.5^n]
for the product of the three matricies
July 30th 2010, 02:55 AM
Ackbeet
Closer, but still no cigar. I think y... | 5 | [
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... | 17,437 | 17437 | |
f(x^2+y^2)=g(x)g(y) ...
May 26th 2011, 04:18 AM #1
f(x^2+y^2)=g(x)g(y) ...
Hello everybody!
A problem:
Find functions $\varphi , \psi$ which are fulfilling:
$\varphi(x^2+y^2)=\psi(x) \psi(y)$ for all $x,y$.
Prove that if $\varphi , \psi$ are fulfilling the above equation then $\psi$ determined... | 5 | [
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0.0278320... | 17,438 | 17438 | |
Restriction of irreducible representations
up vote 1 down vote favorite
1
Given a locally compact group $G$ with a compact subgroup $K$.
Assume we are given two irreducible, infinite dimensional, admissible representations $\pi$ and $\pi'$ of $G$.
What are examples, where $Res_K \pi$ and $Res_K \pi'$ are not iso... | 5 | [
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0.01226806640625,
0.063964843... | 17,439 | 17439 | |
Inkjet Printed Planar Coil Antenna Analysis for NFC Technology Applications
International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 486565, 6 pages
http://dx.doi.org/10.1155/2012/486565
Research Article
Inkjet Printed Planar Coil Antenna Analysis for NFC Technology Applications
^1Electronics... | 4 | [
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-0.0059509277343... | 17,440 | 17440 | |
Using Power Series to find this sum
April 7th 2010, 01:31 PM #1
Member
Joined
Mar 2009
Posts
168
Using Power Series to find this sum
Can anyone help me on this? I'm trying to find the sum of
$\sum_1^\infty \frac{k}{3^{2k}}$ using power series.
This looks like a geometric sequence to me, but I c... | 5 | [
-0.0194091796875,
-0.039306640625,
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0.03759765625,
-0.052490234375,
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0.050048828125,
-0.08984375,
0.061279296875,
0.029052734375,
-0.083984375,
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0.05615234375,
-0.010498046875,
-0.039306640625,
0.01806640625,
-0.0079345703125,
-0.0354003... | 17,441 | 17441 | |
Find subgroups of finitely generated abelian groups
It seems you're looking for the subgroup lattice of finitely generated abelian groups?
Well, the following article may help:
http://www.google.be/url?sa=t&source...5OYWYg&cad=rja
Also keep in mind that if G and H are groups such that gcd(|G|,|H|)=1, then
[itex]Sub... | 5 | [
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0.057861328125,
-0.064453125,
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0.06640625,
-0.056640625,
0.02441... | 17,442 | 17442 | |
[SOLVED] Rate Meaure
November 2nd 2007, 08:11 AM #1
as5tx
Guest
[SOLVED] Rate Meaure
An aeroplane at alt of 1 Km flying horizontaly @ 800Km/hr passes over an observer. Find the @ it is apporoching observer when it is 1250Km away from him.
If I assume the question is asking what is the rate of change of the d... | 5 | [
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0.059814453125,
-0.08935546875,
0.09130859375,
0.06396484375,
-0.0299... | 17,443 | 17443 | |
The definite integral
Substitute the limits correctly. The constant of integration is eliminated during subtraction.
Quote: Originally Posted by norivea INT.(-1 --> 0)[(2-x)^4]dx if u = (2-x), then du = -dx, or dx = -du. So the original integral, in indefinite form, becomes INT.[u^4](-du) So, to continue, = (-)INT.
[u... | 5 | [
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0.05224609375,
-0.091796875,
-0.011962890625,
0.00994873046875,... | 17,444 | 17444 | |
Prime congruence series formula
I think I now have a valid solution for the case p - 1 doesn't divide k:
Let g be a primitive root mod p. That is, g generates the multiplicative subgroup that consists of the non-zero elements of Z/pZ. See
this Wikipedia article
if you're not familiar with primitive roots. Thus, each... | 4 | [
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-0.0046997070312... | 17,445 | 17445 | |
ure
The third example in Appendix K is the combination of a lump-sum advance at consummation and monthly advances after consummation. The borrower receives a lump-sum advance of $10,000 plus the initial
monthly payment of $725 at consummation. The borrower will continue to receive $725 per month for the 12-year term o... | 5 | [
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0.0830078125,
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0.051025390625,
-0.057373046875,
-0.0097656... | 17,446 | 17446 | |
Trig Identities
November 23rd 2009, 11:13 AM
goliath
Trig Identities
Hey guy, I need help with another problem,
Suppose that $3\pi /2 < \Theta < 2\pi$ and $\sec \Theta = 3$ Evaluate the following
$a. \sin \Theta$
$b. \cos (-\Theta)$
$c. \tan (\pi /2 - \Theta)$
$d. \cot ( \pi + \Theta )$
... | 4 | [
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0.10302734375,
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0.0537109375,
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0.01397705078125,
0.0220947265625,
0.0023345947265625,
-0.0625,
0.00811767578125,
-0.0004... | 17,447 | 17447 | |
Remainder Theorem
July 19th 2009, 11:33 AM #1
Newbie
Joined
Jul 2009
Posts
20
Remainder Theorem
Find the remainder when x^3 + 4x^2 - 7x + 6 is divided by x - 3, by using the remainder theorem, and by long division.
Last edited by Coolman; July 19th 2009 at 12:10 PM.
P(3) = x^3 + 4x^2 - 7x + 6
... | 4 | [
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0.006683349609375,
0.027099609375,
0.03515625,
-0.0498046875,
-0.08544921875,
0.... | 17,448 | 17448 | |
Pump
Each cycle corresponds to a T=const. process. (in another version of this problem the pumping process is very fast and a the transformation would correspond to an adiabatic process - all you have to
do is to add the exponent [tex]\gamma[/tex] to the equations below). After the first cycle the air volume increases... | 4 | [
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0.000240325927734375,
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0.00677490234375,
-0.00086212158203125,
0.040283203125,
-0.1186523... | 17,449 | 17449 | |
inverse trig integration
July 10th 2009, 03:56 PM #1
Junior Member
Joined
Jan 2009
Posts
68
inverse trig integration
find the integral of dx/sqrt(1-4x^2). I know I should be using sin^-1 indentity when integrating but my problem is making the the coefficient of x equal to 1. I'm doing something wrong wit... | 5 | [
0.0400390625,
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0.03125,
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0.06494140625,
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-0.0093994140625,
0.027099609375,
-0.04736... | 17,450 | 17450 | |
Coprime polynomials
November 23rd 2008, 06:39 AM #1
Junior Member
Joined
Nov 2008
Posts
50
Coprime polynomials
Can you help me with this problem:
I have to prove that if gcd(f(x),g(x))=1 then there exist unique u(x) and v(x) such that u(x)f(x)+v(x)g(x)=1 and deg u(x)< deg g(x) , deg v(x)< deg f(x).
... | 5 | [
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0.038818359375,
-0.0... | 17,451 | 17451 | |
Finding the Energy Efficient Curve: Gate Sizing for Minimum Power under Delay Constraints
VLSI Design
Volume 2011 (2011), Article ID 845957, 13 pages
http://dx.doi.org/10.1155/2011/845957
Research Article
Finding the Energy Efficient Curve: Gate Sizing for Minimum Power under Delay Constraints
Department of Electric... | 4 | [
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0.06396484375,
-0.0093994140625,
0.04... | 17,452 | 17452 | |
Isomorphism Question
November 6th 2011, 06:25 AM #1
Junior Member
Joined
Sep 2009
Posts
62
Isomorphism Question
Show that U(10)-->Z4 where f(3)=2. Show it's either an isomorphism or it isn't.
U(10) = {1,3,7,9} under multiplication and <3> with order 4.
Z4 is 0,1,2,3 under addition mod 4.
I... | 4 | [
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0.00182342529296875,
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-0.016357421875,
-0.0908203125,
0.01745605... | 17,453 | 17453 | |
Real Analysis - Uniform Convergence
1. The problem statement, all variables and given/known data
Prove that if f[n] -> f uniformly on a set S, and if g[n] -> g uniformly on S, then f[n] + g[n] -> f + g uniformly on S.
2. Relevant equations
3. The attempt at a solution
f[n] -> f uniformly means that |f[n](x) - f(x)| <... | 4 | [
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0.01092529296875,
-0.07275390625,
0.0703125,
0.0194091796875,... | 17,454 | 17454 | |
Irrationality and Division
December 17th 2008, 10:11 AM #1
Junior Member
Joined
Sep 2008
Posts
53
Irrationality and Division
I have two questions in my packet that I'm not completely show how to do. Any help is appreciated.
Q1) prove that the sum of square root of 2 and square root of 3 is irrationa... | 4 | [
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-0.01031494140625... | 17,455 | 17455 | |
More problems
June 9th 2006, 10:24 AM #1
Newbie
Joined
Jun 2006
Posts
11
More problems
plz help solve these, thank you
1.Find two numbers who Difference is 10 and 1 over 6 whoses sum is 11.
2. The sum of two numbers is 33. Twice the first number minus the second number Equals 18. Find both ... | 4 | [
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0.04... | 17,456 | 17456 | |
Euler problems/111 to 120
From HaskellWiki
< Euler problems
(Difference between revisions)
Lisp (Talk | contribs) Lisp (Talk | contribs)
← Older edit Newe... | 5 | [
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Simple Substituting and Rearranging
OK - to avoid having to squint at the attachment - and so others can have easier input:
$$DC_sAt = A\left ( C_0-\frac{C_s}{2} \right )\frac{x^{\prime 2}}{2} -\frac{c}{6}\left ( C_0-\frac{7}{6}C_s \right )x^{\prime 3} \qquad \text{...(23)}\\
\text{...from eqn(17), $\phi$ as a functi... | 4 | [
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... | 17,458 | 17458 | |
What is the reminder when 91 + 92 + 93 + ...... + 99 is
Author Message
TAGS:
What is the reminder when 91 + 92 + 93 + ...... + 99 is [#permalink] 05 Apr 2006, 01:11
... | 4 | [
0.0091552734375,
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Calculating the maximum stress of the in the beam? Am i correct?
Illustration attached -->
Attachment 42037
I have a question which requires me to calculate the maximum stress in a simple supported beam.
The beam is 3 m long and rectangular and has two forces acting down vertically totalling 20 kN.
The breadth of t... | 5 | [
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... | 17,460 | 17460 | |
Physics Forums - Verify Answer- Porsche Power Question
bcjochim07 Apr12-08 03:09 PM
Verify Answer- Porsche Power Question
A Porsche 944 Turbo has a rated engine power of 217 hp (161882 W). 70% of the power is lost in the drive train, and 30% reaches the wheels. The total mass of the car & driver is 1480 kg, and ... | 4 | [
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Geometric sequence
April 12th 2008, 11:11 AM #1
Junior Member
Joined
May 2007
Posts
56
I am stuck on what to do here.. The answer is +- 1/8
Q) Given that the first term of a geometric sequence is 4, and the third is 1, find possible values for the 6th term.
Do you have to bring in logs or someth... | 4 | [
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Patent US7942068 - Method and system for multi-path ultrasonic flow rate measurement
BACKGROUND OF THE INVENTION
This invention relates generally to ultrasonic flow rate measurement, and more particularly to multi-path ultrasonic flow meter.
Ultrasonic flow meters are used to determine the flow rate (i.e., mean pipe ... | 4 | [
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Massive observers with light speed when crossing the event horizon
HallsofIvy
No, that is not true. A massive object can never have speed c, even for an "instantly short period" (whatever that means).
If I was to ask you what the vertical velocity of a free falling object relative to the ground was at its apogee, y... | 4 | [
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0... | 17,464 | 17464 | |
Taylor Derivatives!!!!!
June 25th 2008, 04:58 PM #1
Member
Joined
Jun 2008
Posts
87
Taylor Derivatives!!!!!
Hi! Please help me figure out up to 3 derivatives of: 25arctan(x)!!! I need the 1st, 2nd, and 3rd derivatives of this function!! Thank you so much!!!!
You are expected to know that $\frac{d}{d... | 5 | [
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-... | 17,465 | 17465 | |
[SOLVED] Complex Stiffness Solution
October 9th 2009, 10:49 AM #1
Newbie
Joined
Oct 2009
Posts
20
[SOLVED] Complex Stiffness Solution
Hi,
I'm trying to solve a differential equation of a 1 degree of freedom mechanical system with a complex stiffness:
m*d^2u/dt^2 + k*u = A*e^(i*w*t), where k is ... | 5 | [
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Patent US4807173 - Frequency-domain block-adaptive digital filter
BACKGROUND OF THE INVENTION
The invention relates to a frequency-domain block-adaptive digital filter having a finite impulse response of length N for filtering a time-domain input signal in accordance with the overlap-save
method.
A frequency-domain a... | 4 | [
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Patent US7072417 - LDPC encoder and method thereof
CROSS REFERENCE TO RELATED APPLICATIONS
The present invention claims priority under 35 U.S.C. §119 (e) from U.S. provisional application Ser. No. 60/214,781, entitled “Address Generator for LDPC Encoder and Decoder and Method Thereof,”
filed Jun. 28, 2000, the content... | 4 | [
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4th order DE
P: 23 I have a 4th order differential equation with given -2 +3i root.
Now need to find the homogenous solution. Well, if the root was real, it would be easier but now I'm stuck and don't know how to proceed.
What am I supposed to do to solve th... | 4 | [
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3.3:
The Probability Measure
From Risk Analysis in Building Fire Safety Engineering
3.3 The Probability Measure
To create a mathematical model which will enable us to quantify the likelihood of the various outcomes of the experiment, we attach to each event a number between 0 and 1 which will be called the
probabili... | 4 | [
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behavior of solutions
October 13th 2009, 02:16 PM #1
Newbie
Joined
Jul 2009
Posts
9
behavior of solutions
If a>0, b>0, c=0, show that all solutions of ay''+by'+cy=0 approach a constant that depends on the initial conditions as t approaches to infinity. Determine this constant for the initial
conditon... | 5 | [
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vector problems
March 4th 2008, 10:03 AM #1
Newbie
Joined
Mar 2008
Posts
11
vector problems
couple here to help please:
a) if position vector A has co-ordinates (2, -1) how do I calculate the unit vector in the direction OA where O is the origin? Is it 2v?
b) If I have 3 vectors P, Q, and R all... | 4 | [
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How to Group Genes according to Expression Profiles?
International Journal of Plant Genomics
Volume 2011 (2011), Article ID 261975, 10 pages
http://dx.doi.org/10.1155/2011/261975
Methodology Report
How to Group Genes according to Expression Profiles?
^1Estadistica y Biometría, Universidad Nacional de Córdoba, 5000 C... | 4 | [
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Taylor Series Problems
April 24th 2008, 11:02 AM #1
Newbie
Joined
Feb 2007
Posts
23
Hi all,
These have been giving me some trouble:
1. Use series to approximate the definite integral to within 3 decimal places
The integral from 0 to 1 : xcos(x^3) dx
2. Approximate f by a Taylor polynom... | 5 | [
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Distinct eigenvalues of a normal matrix
November 26th 2011, 08:32 AM #1
Newbie
Joined
Nov 2011
Posts
14
Distinct eigenvalues of a normal matrix
Given a matrix $X\in\mathbf{R}^{3\times n}$ and a diagonal matrix $D$ with known positive diagonal entries, what conditions may I impose on the columns of $X$ su... | 4 | [
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Transforming a 3D vector using matrix
Using a single 4x4 matrix to do both rotation and translation, you have to use a "projective" space. That means you are representing the point (x,y,z) as the (column) vector [x y z 1] with the
provision that [a b c d] is the same as [a/d b/d c/d 1] (d can never be 0). In that case ... | 4 | [
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0.0683593... | 17,476 | 17476 | |
Patent US4100599 - Method and apparatus for determining velocity of a moving member
BACKGROUND OF THE INVENTION
This invention relates to a method and apparatus for measuring and displaying in numerical form the speed of a moving member. In high speed document sorters or similar devices wherein documents are
transport... | 4 | [
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Advanced cubic interpolation problem
November 5th 2008, 10:39 PM #1
Newbie
Joined
Oct 2008
Posts
7
Hi everyone.
Ive already posted this problem in the "Calculus" section like week ago, but nobody replied and i assumed that ive chosen a wrong section.
My problem is:
Find the local minima of t... | 4 | [
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0.... | 17,478 | 17478 | |
Exercises on Poisson processes
December 4th 2012, 07:38 AM
Flower90
Exercises on Poisson processes
I need help to solve these exercises about Poisson processes:
1)Arrivals of the Number 1 bus form a Poisson process of rate one bus per hour, and arrivals of the Number 7 bus form an independent Poisson proces... | 5 | [
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-0... | 17,479 | 17479 | |
GBM and wiener process
October 4th 2012, 04:04 PM #1
Newbie
Joined
Oct 2012
From
canada
Posts
14
GBM and wiener process
Wiener Process and GBM process
I have these two problems on hand and I don't think I have the basic idea
Consider the generalized Wiener Process
dx=0.1dt+0.3dz
s... | 4 | [
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-0.141... | 17,480 | 17480 | |
Basic Kinematics Question
I just want to go through your reasoning to make sure I follow:
KingKai
The equation
v[2]^2 = v[o]^2 + 2aΔy
is used to determine the change in position, acceleration, or velocity of a particle under the influence of a quadratic force.
That would be a net unbalanced force which is consta... | 4 | [
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... | 17,481 | 17481 | |
x^4-81=0
If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying x4 + -81 = 0 Reorder the terms: -81 + x4 = 0 Solving -81 + x4 = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of
the e... | 4 | [
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geometry
December 13th 2007, 08:50 AM
jenjen
geometry
plz help...
Suppose we are given an isosceles triangle ABC in the coordinate plane R^2 whose vertices are given by A = (o, h), B= (-x, 0), and C= (x, 0). Then the point J where the angle bisectors meet lies
on the y-axis. Find its
y-coordinate.... | 4 | [
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Complex Vector Spaces
A vector space is a set of objects, called vectors, along with two operations, called addition and scalar multiplication, such that the sum of any two vectors and the scalar multiple of any vector is
also a vector. The complex numbers form a vector space. Those would be the numbers of the form a+b... | 4 | [
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Physics Forums - View Single Post - Solution to the differential equation describing a mass-spring-damper
What is the general solution to the differential equation describing a mass-spring-damper?
t=time
x= extension of spring
M=Mass
K=Spring Constant
C=Damping Constant
g= acceleration due to gravity
Spring has 0 le... | 5 | [
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Homework Help
October 14th 2007, 08:36 AM
vc15ao4
Homework Help
1) The time required for a pendulum to complete one round trip of motion is given by T=2pie(squareroof of (g/32). Solve the formula for g. Assume all variables represent positive quantities.
2)A local fitness club is gaining members at a const... | 4 | [
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Make x the subject
August 3rd 2007, 12:32 AM #1
Newbie
Joined
Aug 2007
Posts
5
Make x the subject
Make x the subject of the formula: $v=\frac{1}{k}\sqrt{[1+(\frac{1}{x}+1)^2}/Lg$ In case I made a mistake in the coding, its v=1/k sqrt(1+(1/x +1)^2/Lg)
$\text{Lg}$ as in the logarithm with base 2? The ... | 4 | [
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Patente US4920490 - Process and apparatus for distinguishing conductivities by electric current computed tomography
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates in general to the field of electric current computed tomography or ECCT, and, in particular, to a new and useful method and apparatus f... | 4 | [
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Patent US5790968 - Control system and method for vehicle with continuously variable transmission
TECHNICAL FIELD
The present invention relates to control system and method for a vehicle having a continuously variable transmission between an engine and a continuosly variable drive axle.
BACKGROUND ART
In the case of ... | 4 | [
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ons
HPS 0410 Einstein for Everyone
Back to main course page
Non-Euclidean Geometry and Curved Spaces
John D. Norton
Department of History and Philosophy of Science
University of Pittsburgh
Unfamiliar Geometries Become Familiar
In the last chapter, we explored the geometry induced by the postulate 5^NONE by means ... | 4 | [
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(Probability) The birthday problem...P(at least 2)...DIRECT APPROACH
1. The problem statement, all variables and given/known data
What is the probability that given a group of 5 people, at least 2 will share the same birthday?
2. Relevant equations
I know that 1-P(0 matches) = answer, but there is a reason I am goin... | 4 | [
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More Related Rates
November 24th 2006, 01:36 PM
Jacobpm64
More Related Rates
A ruptured oil tanker causes a circular oil slick on the surface of the ocean. When its radius is 150 meters, the radius of the slick is expanding by 0.1 meter/minute and its thickness is 0.02
meter. At that moment:
(a) How fas... | 5 | [
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Domain and Range
October 20th 2011, 09:47 PM
Stroodle
Domain and Range
Hi,
I'm just wondering if I'm correct and also what notation I should use here.
The question is asking for the domain and range of $f(x,y)=e^{y-x^2}$
I think the domain is $Domain \subset R^2$ and $Range>0$
Thanks for your... | 4 | [
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Countability Question
April 16th 2011, 11:54 AM #1
Member
Joined
Sep 2008
Posts
95
Countability Question
Prove the following assumption:
If C is a countable set and f: A->C is an injection, then A is countable.
I'm stuck on how to prove this, as I originally learnt it as the very definition of ... | 5 | [
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Patent US7970208 - Apparatus to detect homogeneous region of image using adaptive threshold
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims benefit under 35 U.S.C. §119(a) of Korean Patent Application No. 2004-113795, filed Dec. 28, 2004, the disclosure of which is incorporated herein in its entirety b... | 4 | [
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Permutations
March 9th 2013, 01:34 PM #1
Junior Member
Joined
Mar 2010
Posts
25
Permutations
Hey, i'm having a hard time seeing how to do this problem. Any hints?
$\alpha \in S_{n}$ a cycle $(a_{1},a_{2},...,a_{k}) (a_{1},a_{2},...,a_{k} \:distinct \:elements \:from \:the \:set \:\{1,2,..n\})$. Let ... | 5 | [
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.
BOOK II. PROPOSITIONS.
Proposition 1.
If there be two straight lines
,
and one of them be cut into any number of segments whatever
,
the rectangle contained by the two straight lines is equal to the rectangles contained by the uncut straight line and each of the segments
.
Let
A
,
BC
be two straight line... | 4 | [
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Patent US6215915 - Image processing methods and apparatus for separable, general affine transformation of an image
RESERVATION OF COPYRIGHT
The disclosure of this patent document contains material that is subject to copyright protection. The owner thereof has no objection to facsimile reproduction by anyone of the pat... | 4 | [
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Proving Basic Set Operations
February 12th 2009, 12:37 PM #1
Newbie
Joined
Feb 2009
Posts
3
Proving Basic Set Operations
Hello,
Sorry if my questions seem elementary, I am new to real analysis. Anyway I am having trouble with the following:
1. Prove that the empty set is unique. That is, suppos... | 4 | [
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