Archive for April, 2008

Koilodepas; Bentham to distinguish between

Wednesday, April 30th, 2008

Koilodepas is a genus of plant of the family Euphorbiaceae. It comprises 10 species, found from India to Malesia. Half of these species are found in Malesia.


Synonyms

  • Caelodepas Benth. orth. var.
  • Calpigyne Blume
  • Coelodepas Hassk. orth. var.
  • Nephrostylus Gagnep.

Expected utility hypothesis; of ‘expectation utility’

Tuesday, April 29th, 2008

The expected utility hypothesis is the hypothesis in economics that the utility of an agent facing uncertainty is calculated by considering utility in each possible state and constructing a weighted average. The weights are the agent’s estimate of the probability of each state. The expected utility is thus an expectation in terms of probability theory. To determine utility according to this method, the decision maker must rank their preferences according to the outcomes of various decision options. According to the theory, if someone prefers A to B and B to C, then weights for the weighted average must exist such that she is indifferent between receiving B outright and gambling– with the specified weights– between A and C.

Daniel Bernoulli (1738) gave the earliest known written statement of this hypothesis as a way to resolve the St. Petersburg Paradox. In the expected utility theorem, v. Neumann and Morgenstern proved that any “normal” preference relation over a finite set of states can be written as an expected utility. (Therefore, it is also called von-Neumann Morgenstern utility.) Von Neumann and Morgenstern published this in their Theory of Games and Economic Behavior in 1944. It is important because it was developed shortly after the Hicks-Allen “ordinal revolution” of the 1930’s, and it revived the idea of cardinal utility in economic theory. Economics has not resolved whether (and in what cases) utility is cardinal or ordinal.

A related concept is the certainty equivalent of a gamble. The more risk-averse a person is, the more he will be prepared to pay to eliminate risk, for example accepting $1 instead of a 50% chance of $3, even though the expected value of the latter is more. People may be risk-averse or risk-loving depending on the amounts involved and on whether the gamble relates to becoming better off or worse off; this is a possible explanation for why the same person may buy both an insurance policy and a lottery ticket. However, expected utility as a descriptive model of decisions under risk has in recent years been replaced by more sophisticated variants that take irrational deviations from the expected utility model into account; compare Prospect theory and the general article on Behavioral finance.

The concept of risk-aversion comes into play in many gambling scenarios, such as poker strategy. A risk-neutral stance is generally the best strategy under normal conditions, as it attempts to maximize the expected value of each bet. However, there are situations where different strategies will be more beneficial. For example, many experts advocate a risk-averse strategy in the early stages of a poker tournament, when there are still many players left. As the tournament advances, a more risk-neutral or even risk-loving strategy becomes the more optimal play, especially as more players are eliminated. This change in strategy is due to the difference between expected value and expected utility. See M-ratio for more information on this concept as it relates to poker theory.

Preference Reversals over Uncertain Outcomes:
Starting with studies such as Lichtenstein & Slovic (1971), it was discovered that subjects sometimes exhibit signs of preference reversals with regards to their certainty equivalents of different lotteries. Specifically, when eliciting certainty equivalents, subjects tend to value “p bets” (lotteries with a high chance of winning a low prize) lower than “$ bets” (lotteries with a small chance of winning a large prize). When subjects are asked which lotteries they prefer in direct comparison, however, they frequently prefer the “p bets” over “$ bets.” Many studies have examined this “preference reversal,” from both an experimental (e.g., Plott & Grether, 1979) and theoretical (e.g., Holt, 1986) standpoint, indicating that this behavior can be brought into accordance with neoclassical economic theory under certain assumptions.


Further reading

  • Bernoulli, D (1954) “Exposition of a New Theory on the Measurement of Risk” (original: 1738), “Econometrica” 22:23-36.
  • Schoemaker PJH (1982) “The Expected Utility Model: Its Variants, Purposes, Evidence and Limitations”, “Journal of Economic Literature”, 20:529-563.
  • P.Anand (1993) “Foundations of Rational Choice Under Risk”, Oxford, Oxford University Press. ISBN 0198233035
  • K.J. Arrow (1963) “Uncertainty and the Welfare Economics of Medical Care”, American Economic Review, Vol. 53, p.941-73.
  • Scott Plous (1993) “The psychology of judgment and decision making”, Chapter 7 (specifically) and 8,9,10, (to show paradoxes to the theory).

Avalonianus; remains always qualitatively

Tuesday, April 29th, 2008

Avalonianus was first believed to be a dinosaur. It was first described in 1898 by Seeley from teeth from the Late Triassic of England, but the name was preoccupied (Walcott, 1889), so Kuhn renamed it in 1961. It was thought to be a prosauropod, as additional, prosauropod postcranial remains were added to it (which would eventually be named Camelotia). Later analysis revealed it was actually a chimera of prosauropod remains (Camelotia) and teeth from a non-dinosaurian archosaur (or possibly an early theropod).


References

  • Go to Camelotia for more information
  • http://www.dinosauria.com/dml/genera.htm
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Priest (tool); The notion

Monday, April 28th, 2008

A priest is a tool, often resembling a blunt weapon, used for quickly killing fish. Priests usually come in the form of a heavy metal head attached to a metal or wooden stick. The name “priest” comes from the notion of administering the “last rites” to the fish. Anglers often use priests to quickly kill fish. [1]

Pairing function; function <math>v

Sunday, April 27th, 2008

In mathematics a pairing function is a process to uniquely encode two natural numbers into a single natural number.

Any pairing function can be used in set theory to prove that integers and rational numbers have the same cardinality as natural numbers. In theoretical computer science they are used to encode a function defined on a vector of natural numbers f:NkN into a new function g:NN.

Every pairing function is primitive recursive.

Contents


Definition

A pairing function is a bijective function

<math>\pi:\mathbb{N} \times \mathbb{N} \to \mathbb{N}.</math>


Cantor pairing function

The Cantor pairing function is a pairing function

<math>\pi:\mathbb{N} \times \mathbb{N} \to \mathbb{N}</math>

defined by

<math>\pi(k_1,k_2) := \frac{1}{2}(k_1 + k_2)(k_1 + k_2 + 1)+k_2.</math>

When we apply the pairing function to <math>k_1</math> and <math>k_2</math> we often denote the resulting number as <math>\langle k_1, k_2 \rangle</math>

This definition can be inductively generalized to the Cantor tuple function

<math>\pi^{(n)}:\mathbb{N}^n \to \mathbb{N}</math>

as

<math>\pi^{(n)}(k_1, \ldots, k_{n-1}, k_n) := \pi ( \pi^{(n-1)}(k_1, \ldots, k_{n-1}) , k_n)</math>


Inverting the Cantor pairing function

Suppose we are given z with

<math> z = \langle x, y \rangle = \frac{(x + y)(x + y + 1)}{2} + y </math>

and we want to find x and y. It is helpful to define some intermediate values in the calculation:

<math> w = x + y \!</math>
<math> t = \frac{w(w + 1)}{2} = \frac{w^2 + w}{2} </math>
<math> z = t + y \!</math>

where t is the triangle number of w. If we solve the quadratic equation

<math> w^2 + w - 2t = 0 \!</math>

for w as a function of t, we get

<math> w = \frac{\sqrt{8t + 1} - 1}{2} </math>

which is a strictly increasing and continuous function when t is non-negative real. Since

<math> t \leq z = t + y < t + (w + 1) = \frac{(w + 1)^2 + (w + 1)}{2} </math>

we get that

<math> w \leq \frac{\sqrt{8z + 1} - 1}{2} < w + 1 </math>

and thus

<math> w = \left\lfloor \frac{\sqrt{8z + 1} - 1}{2} \right\rfloor </math>.

So to calculate x and y from z, we do:

<math> w = \left\lfloor \frac{\sqrt{8z + 1} - 1}{2} \right\rfloor </math>
<math> t = \frac{w^2 + w}{2} </math>
<math> y = z - t \!</math>
<math> x = w - y \!</math>.

Since the Cantor pairing function is invertible, it must be one-to-one and onto.


References

Strength reduction; function for

Sunday, April 27th, 2008

Strength reduction is a compiler optimization where a function of some systematically changing variable is calculated more efficiently by using previous values of the function. In a procedural programming language this would apply to an expression involving a loop variable and in a declarative language it would apply to the argument of a recursive function. E.g.

f x = … (2**x) … (f (x+1)) …

becomes

f x = f’ x (2**x)

where

f ‘ x z = … z … (f’ (x+1) 2*z) …

Here the expensive operation (2**x) has been replaced by the cheaper 2*z in the recursive function f’. This maintains the invariant that z = 2**x for any call to f’.

Multiple (mathematics); p w </math>

Sunday, April 27th, 2008

In mathematics, a multiple of an integer is the product of that integer with another integer. In other words, a is a multiple of b if <math>a=nb,</math> where <math>n</math> is an integer. If <math>b</math> is not zero, this is equivalent to saying that <math>a/b</math> is an integer.


Examples

  • 14, 49, and -21 are multiples of 7 whereas -3, 15, and 20 are not multiples of 7.


Properties

  • Every number is a multiple of itself (<math>b=1\cdot b </math>).
  • 0 is a multiple of every number (<math>0=0\cdot b</math>).
  • If <math>a</math> and <math>b</math> are multiples of <math>x,</math> then <math>a+b</math>, <math>a-b</math> and <math>ab</math> are multiples of <math>x.</math>
  • For any integer <math> p > 1,</math> <math>(p-1)!+1</math> is a multiple of <math>p</math> if and only if <math>p</math> is a prime number (Wilson’s theorem).


See also

  • Ideal (ring theory)
  • Decimal and SI prefix

FP (complexity); problem;

Sunday, April 27th, 2008

In computational complexity theory, the complexity class FP is the set of function problems which can be solved by a deterministic Turing machine in polynomial time; it is the function problem version of the decision problem class P. Roughly speaking, it is the class of functions that can be efficiently computed on classical computers without randomization.

FP is formally defined as:

A binary relation P(x,y) is in FP if and only if there is a deterministic polynomial time algorithm that, given x, can find some y such that P(x,y) holds.

The difference between FP and P is that problems in P have one-bit, yes/no answers, while problems in FP can have any output that can be computed in polynomial time. For example, adding two numbers is an FP problem, while determining if their sum is odd is in P. More complex is the relationship between FP and FNP. FNP is defined as follows:

A binary relation P(x,y), where y is at most polynomially longer than x, is in FNP if and only if there is a deterministic polynomial time algorithm that can determine whether P(x,y) holds given both x and y.

That is, instead of merely verifying y, the algorithm for solving an FP problem must find its value. This is similar to the computation/verification relationship between P and NP; it also shows that FP is contained in FNP. In fact, FP = FNP if and only if P = NP.

Polynomial-time function problems are fundamental in defining polynomial-time reductions, which are used in turn to define the class of NP-complete problems.

Because a machine that uses logarithmic space has at most polynomially many configurations, FL, the set of function problems which can be calculated in logspace, is contained in FP. It is not known whether FL = FP; this is analogous to the problem of determining whether the decision classes P and L are equal.


References

  • Complexity Zoo: FP

Global Strategy; pursue their immediate

Sunday, April 27th, 2008

Firms that pursue a Global Strategy are faced with great pressures from cost reductions but with weak pressure for local responsiveness.

Therefore, it allows these firms to sell a standardized product worldwide. However, fixed costs (capital equipment) are substantial. Nevertheless, these firms are able to take advantage of scale economies & experience curve effects, because it is able to mass-produce a standard product which can be exported (providing that demand is greater than the costs involved).


External links

  • Global Strategic Management, QuickMBA

List of people granted honorary French citizenship during the French Revolution; by Bentham to

Saturday, April 26th, 2008

During the French Revolution, France granted honorary French citizenship to those deemed champions of the cause. However, not all were sympathizers with the Revolution.

  • Joel Barlow
  • Ludwig van Beethoven
  • Jeremy Bentham
  • Robert Burns
  • Johann Heinrich Campe
  • Thomas Clarkson
  • Anacharsis Cloots
  • Cornelius de Pauw
  • Giuseppe Gorani
  • Alexander Hamilton
  • Friedrich Gottlieb Klopstock
  • Tadeusz Kosciuszko
  • James Mackintosh
  • James Madison
  • Thomas Paine
  • Johann Heinrich Pestalozzi
  • Joseph Priestley
  • Friedrich Schiller
  • George Washington
  • William Wilberforce
  • David Williams
  • Thomas Muir

Atkinson index; and income;

Saturday, April 26th, 2008

The Atkinson index (also known as the Atkinson measure) is a measure of economic income inequality developed by Anthony Barnes Atkinson. The distinguishing feature of the Atkinson index is its ability to gauge movements in different segments of the income distribution.

The index can be turned into a normative measure by imposing a coefficient <math>\varepsilon</math> to weight incomes. Greater weight can be placed on changes in a given portion of the income distribution by choosing <math>\varepsilon</math>, the level of “inequality aversion”, appropriately. The Atkinson index becomes more sensitive to changes at the lower end of the income distribution as <math>\varepsilon</math> approaches 1. Conversely, as the level of inequality aversion falls (that is, as <math>\varepsilon</math> approaches 0) the Atkinson becomes more sensitive to changes in the upper end of the income distribution.

The Atkinson index is defined as:

<math>A=

\begin{cases}
1-\frac{1}{\mu}\left(\frac{1}{N}\sum_{i=1}^{N}y_{i}^{1-\varepsilon}\right)^{1/(1-\varepsilon)}
& \mbox{for}\ \varepsilon \in \left[0,1\right) \\
1-\frac{1}{\mu}\left(\prod_{i=1}^{N}y_{i}\right)^{1/N}
& \mbox{for}\ \varepsilon=1,
\end{cases}
</math>

where <math>y_{i}</math> is individual income (i = 1, 2, …, N) and <math>\mu</math> is the mean income.

An entropy measure from Atkinson can be computed from the Theil index, T, (example without using <math>\varepsilon</math>)

<math>A = 1 - e^{-T}.\,</math>


References

  • Paul D. Allison, Measures of Inequality, American Sociological Review, 43 (December 1978), pp. 865-880, presents a technical discussion of the Atkinson measure’s properties.
  • Income Inequality, 1947-1998, from the United States Census Office.


See also

  • Theil index
  • Gini index

Maximum Overdrive (song); maximum

Saturday, April 26th, 2008

Maximum Overdrive” was the fourth single taken from the 2 Unlimited album No Limits. The single reached #15 in the UK.


Remixes

  • X-Out Mix
  • Extended Mainstream Vibe
  • Speedaumatic Remix
  • X-Out In Trance
  • Extended
  • Radio
  • Spanish

Priszm; when income

Friday, April 25th, 2008

Priszm, is the largest restaurant income trust in Canada and the largest operator of Canadian fast food restaurants. The Priszm Canadian Income Fund
(see TSX:QSR market activity at [1]),
an income trust, owns 60.2% of Priszm; the remainder is owned by John Bitove.

Priszm owns four Yum! Brands restaurant franchises chains in Canada, namely KFC, Pizza Hut, Taco Bell, and Long John Silver’s. The majority of its locations are KFC franchises, some of which are co-branded with other Yum! chains.


External links

  • Company website

Deferred compensation; income are

Thursday, April 24th, 2008

Deferred compensation is an arrangement in which a portion of an employee’s income is paid out at a date after which that income is actually earned. Examples of deferred compensation include pensions, retirement plans, and stock options. The primary benefit of most deferred compensation is the deferral of tax to the date(s) at which the employee actually receives the income.


USA

In the US, Section 409A now imposes fairly detailed requirements on the timing of deferral elections and of distributions with the cudgel of imposing additional tax on the taxpayer prior to actual receipt of the deferred income if these requirements are not complied with.

Reference: Dictionary.com

Overall length; maximum so

Tuesday, April 22nd, 2008

The overall length of an ammunition cartridge is a measurement from the base of the brass shell casing to the tip of the bullet, seated into the brass casing.

Handloaded cartridges and commercially available cartridges for firearms are normally created with a maximum length standardized by the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI). A cartridge’s overall length may be shorter than the maximum standard, equal to the standard, or sometimes even longer.

The maximum overall length is dictated by the need to fit into a box magazine of standard manufacture. For example, the .223 Remington cartridge, when loaded for use in the AR-15 rifle (or the military’s M-16 rifle), has to fit into the removable box magazine for that rifle. This dictates that the cartridge’s maximum overall length be no greater than 2.260″. However, for competition purposes during off-hand and slow fire prone match stages, the .223 Remington is loaded one cartridge at a time into the rifle’s receiver. This allows for the cartridge to be longer than the standardized 2.260″ SAAMI maximum overall length. These cartridges can be safely loaded to a length that has the ogive portion of the bullet just touching the rifle’s lands. Many competitive shooters will make these cartridges 0.005″ less than the truly maximum allowable overall length, for the sake of safety.

It is desirable for these single-loaded cartridges to have as little bullet jump as possible before the bullet’s ogive begins to be engraved by the rifle’s lands. This minimized bullet jump increases the accuracy of the rifle, all else being equal. This practice of long-loading a cartridge must be adjusted for each individual rifle, since there are variations from rifle to rifle as to how far down the barrel the rifling begins.

Pleasure EP; to pleasure remains

Tuesday, April 22nd, 2008

Pleasure EP was the first release by rock band Semisonic. It was originally released in 1995 under their original name, Pleasure, and rereleased with bonus tracks following the success of their song “Closing Time” under their Semisonic name.


Track listing

  1. “The Prize” – 3:54
  2. “Brand New Baby” – 3:31
  3. “In The Veins” – 3:48
  4. “Wishing Well” – 4:40
  5. “Star” – 3:43
  6. “Sculpture Garden” – 2:49
  7. “Drum Lesson (Interlude)” – 0:20
  8. “The Gift” – 2:37
  9. “Shuffle Fragments (Interlude)” – 0:09
  10. “…Shuffle Fragments” – 0:09
  11. “Shuffle Fragments (Interlude)” – 0:17
  12. “Shuffle Fragments (Interlude)” – 0:22
  13. “Shuffle Fragments (Interlude) – 0:04
  14. “…Shuffle Fragments” – 0:24

Faggot (wood); available bundle that

Tuesday, April 22nd, 2008
This article refers to a kind of firewood; for other uses, see Faggot

A faggot or fagot is a bundle of sticks or branches, usually meant for use as firewood.
It derives [1] through the Old French fagot and the Italian diminutive fagotto from the Latin Fasces (”bundle”, also the origin of the word Fascism), coming into Middle English no later than 1279.
It has also been used on occasion to refer more specifically (attested from 1555 in English) to wood for funeral pyres or a burning at the stake, and recanting heretics had to wear an embroidered figure of a faggot on their sleeve.

When a faggot is wrapped in only one band or withe, instead of the traditional two, it is also referred to as a bavin.


Use in popular culture

Sylvia Plath starts her poem “Wuthering Heights” with the line “The horizons ring me like faggots”, likening herself to someone being burnt at a stake, adding that if they are “[t]ouched by a match, they might warm me.”

In The Simpsons episode “The Haw-Hawed Couple”, while discussing a plan to unite against Nelson Muntz, Martin Prince states: “individually we are weak, like a single twig. But as a bundle we form a mighty faggot”. A dictionary definition of the word then appears on screen to clear up the audience intended confusion with the epithet faggot.

The word for bassoon is das Fagott in German, fagót in Spanish, and il fagotto in Italian.

Norway at the 1976 Summer Olympics; A qualification

Tuesday, April 22nd, 2008

Norway was represented at the 1976 Summer Olympics in Montreal by the Norwegian Olympic Committee and Confederation of Sports.

Contents


Medals

Norway finished in 21st position in the final medal rankings, with one gold medal and one silver medal.


Gold

  • Alf Hansen and Frank Hansen — Rowing, Men’s Double Sculls


Silver

  • Finn Tveter, Rolf Andreassen, Arne Bergodd, and Ole Nafstad — Rowing, Men’s Coxless Fours


Results by event


Archery

In the second appearance by the nation in the archery competition at the Olympics, Norway was represented by only one man. A veteran of the 1972 Summer Olympics, Jan Erik Humlekjær shot two points less than his performance of four years before. Nevertheless, he moved up eight places in the ranking.

Men’s Individual Competition:

  • Jan Erik Humlekjær — 2337 points (→ 24th place)


Athletics

Men’s 1500 metres

  • Lars Martin Kaupang
  • Heat — 3:44.59 min (→ did not advance)

Women’s 1500 metres

  • Grete Waitz
  • Heat — 4:07.20 min (→ advanced to the semi final)
  • Semi final — 4:04.80 min (→ did not advance)

Men’s 5000 metres

  • Knut Kvalheim
  • Heat — 13:20.60 min (→ advanced to the final)
  • Final — 13:30.33 min (→ 9th place)

Men’s 10.000 metres

  • Knut Børø
  • Heat — 28:23.07 min (→ advanced to the final)
  • Final — did not finish (→ no ranking)

Men’s High Jump

  • Terje Totland
  • Qualification — 2.16 m (→ advanced to the final)
  • Final — 2.18m (→ 9th place)
  • Leif Roar Falkum
  • Qualification — 2.16 m (→ advanced to the final)
  • Final — 2.10m (→ 14th place)

Women’s High Jump

  • Astrid Tveit
  • Qualification — 1.70 m (→ did not advance)

Men’s Discus Throw

  • Qualification — 61.30 m (→ advanced to the final)
  • Final — 63.06 m (→ 7th place)

Men’s Javelin Throw

  • Terje Thorslund
  • Qualification — 82.52 m (→ advanced to the final)
  • Final — 78.24 m (→ 11th place)
  • Bjørn Grimnes
  • Qualification — 80.32 m (→ advanced to the final)
  • Final — 74.88 m (→ 14th place)


Cycling

Men’s Individual Road Race

  • Thorleif Andresen — 4:49:01 (→ 38th place)
  • Geir Digerud — 5:04:42 (→ 55th place)
  • Pål Henning Hansen — did not finish (→ no ranking)
  • Stein Bråthen — did not finish (→ no ranking)

Men’s 1.000m Time Trial

  • Harald Bundli — 1:08.093 (→ 7th place)

Men’s 4.000m Individual Pursuit

  • Jan Georg Iversen — 7th place
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Distillers dried grains; sources

Monday, April 21st, 2008

Distillers dried grains is a cereal byproduct of the distillation process. There are two main sources of these grains. The traditional sources were from brewers. More recently, ethanol plants are a growing source. It is created in distilleries by drying mash, and is subsequently sold for a variety of purposes, usually as fodder for livestock (especially ruminants).

In beer or whiskey production, or in an ethanol plant, grains such as corn are ground to a coarse consistency and added to hot water. After cooling, yeast is added and the mixture ferments for several days to a week. The solids remaining after fermentation are the distillers grains.


External links

page from the University of Minnesota

  • Magazine about producing Ethanol
  • Transverse Doppler effect; always qualitatively the

    Monday, April 21st, 2008

    In special relativity, the transverse Doppler effect is the nominal redshift component associated with transverse (i.e. lateral) observation, and is important both theoretically and experimentally.

    Contents


    Overview

    If the predictions of special relativity are compared to those of a simple flat nonrelativistic light medium that is stationary in the observer’s frame (“classical theory”), SR’s physical predictions of what an observer sees are always “redder”, by the Lorentz factor

    <math>\gamma = \frac{1}{\sqrt{1-v^2/c^2\,}}.</math>

    The transverse Doppler effect is a direct consequence of the relativistic Doppler effect

    <math>f_o = \frac{f_s}{\gamma\left(1+\frac{v\cos\theta_o}{c}\right)}</math>

    In the particular case when <math>\cos\theta_o=0 \,</math> one obtains the transverse Doppler effect

    <math>f_o=\frac {f_s} {\gamma} \,</math>

    For receding or approaching objects, the redshift factor <math> \frac{1}{\gamma}</math> modifies the redshift or blueshift predictions of “classical theory”. Where the two effects act against each other, the propagation-based effects are stronger. But for the case of an object passing directly across the observer’s line of sight, special relativity’s predictions are qualitatively different to “classical theory” – a redshift where the “classical theory” reference model would have predicted no shift effect at all for the case that the observer is at rest in the aether.

    Because of this, the transverse Doppler effect is sometimes held up as one of the main new predictions of the special theory. As Einstein put it in 1907: according to special relativity the moving object’s emitted frequency is reduced by the Lorentz factor, so that - in addition to the classical Doppler effect - the received frequency is reduced by the same factor.


    Reciprocity

    Sometimes the question arises as to how the transverse Doppler effect can lead to a redshift as seen by the “observer” whilst another observer moving with the emitter would also see a redshift of light sent (perhaps accidentally) from the receiver.

    It is essential to understand that the concept “transverse” is not reciprocal.
    Each participant understands that when the light reaches her/him transversely as measured in terms of that person’s rest frame, the other had emitted the light aftward as measured in the other person’s rest frame. In addition, each participant measures the other’s frequency as reduced (”time dilation”). These effects combined make the observations fully reciprocal, thus obeying the principle of relativity.


    Experimental verification

    In practice, experimental verification of the transverse effect usually involves looking at the longitudinal changes in frequency or wavelength due to motion for approach and recession: by comparing these two ratios together we can rule out the relationships of “classical theory” and prove that the real relationships are “redder” than those predictions.


    longitudinal tests

    The first of these experiments was carried out by Ives and Stilwell in (1938) and although the accuracy of this experiment has since been questioned, many other longitudinal tests have been performed since with much higher precision [1],[2]. These usually claim greater certainty than Ives-Stilwell, but also tend to be more complicated.

    • Herbert E. Ives and G.R. Stilwell, “An experimental study of the rate of a moving clock”
    J. Opt. Soc. Am 28 215-226 (1938) and part II. J. Opt. Soc. Am. 31, 369-374 (1941)


    Transverse Tests

    To date, only one inertial experiment seems to have verified the redshift effect for a detector actually aimed at 90 degrees to the object.

    • D. Hasselkamp, E. Mondry, and A. Scharmann, “Direct Observation of the Transversal Doppler-Shift”
    Z. Physik A 289, 151-155 (1979).


    See also

    • Doppler effect
    • Relativistic Doppler effect
    • Ives-Stilwell experiment
    • Time dilation


    References

    • A. Einstein (1907), “Über die Möglichkeit einer neuen Prüfung des Relativitätsprinzips”, Annalen der Physik SER.4, no.23
    • J. Jackson, Classical Electrodynamics, 3rd ed. (Wiley, New York, 1999).

    Utility Storage; indirect utility function

    Monday, April 21st, 2008

    Utility Storage is a highly virtualized high-end and midrange disk array. It is designed as the building block for utility computing. Utility Computing is the third generation of IT architecture that has emerged over the last few years to challenge traditional mainframe and Distributed Computing (client-server) IT architectures. Utility Computing uses fine-grain virtualization and automation technologies built into server, storage and networking systems to allow organizations to achieve more with less. This in turn lets them improve service responsiveness while driving up utilization efficiency and driving down costs.

    Utility Storage is a new type of disk storage platform that offers improved:

    • simplicity through ease-of-use
    • utilization efficiency
    • massive scalability to hundreds of terabytes in a single system
    • multiple tiers of storage Quality of Service in a single system

    Gary Hudson; for long-term projects

    Monday, April 21st, 2008

    Gary Hudson has been involved in private spaceflight development for over 25 years.

    Hudson is best known as the founder of Rotary Rocket Company, which attempted to build a unique single stage to orbit launch vehicle known as the Roton.

    He also helped found Transformational Space (T/Space) in 2004.

    Previous projects included designs of the Phoenix SSTO and other single stage to orbit rockets, founder of Pacific American Launch Systems, and various consulting projects.


    See also

    • Roton SSTO
    • T/space
    • Ansari X Prize


    External links

    • T/Space
    • HMX Inc consulting company
    • Gary Hudson entry in Spacefuture Who’s Who

    Conservative Libertarianism; to distinguish between

    Monday, April 21st, 2008


    Conservative libertarianism has a number of different meanings related to libertarianism:

    • It can be used to distinguish libertinism from other forms of libertarianism
    • It can be a synonym for classical liberalism
    • It can be used to refer to libertarians that hold some conservative views, such as Republitarians and Hans-Hermann Hoppe.

    Proof of insurance; that would provide

    Sunday, April 20th, 2008

    Proof of insurance (POI) is any type of documentation that a person can provide to another individual proving that the person has valid insurance with an insurance company.

    The most common form of a POI is a paper card provided by the insurance company listing policy information and effective dates.

    Many states require that a person carry proof of insurance in their automobiles or on their person while driving. If a person is questioned by a law enforcement official, they must provide proof of insurance. A citation is generally issued if the person cannot provide such documentation.


    See also

    • no fault insurance

    Paul Check; are future-regarding and thus

    Sunday, April 20th, 2008

    Paul Ramon Check is a New Zealand political candidate. He is the leader of Outdoor Recreation New Zealand, a party based around the hunting and fishing lobbies.

    Check initially worked as a marine engineer in the Royal New Zealand Navy, and then served in the United States Merchant Marine in Brazil. He later worked as an engineer in other parts of Latin America and in New Zealand. He currently manages a company in Taupo.

    In the 2002 election, Check was third on Outdoor Recreation New Zealand’s list, but the party did not win enough votes to enter Parliament. Later, the party affiliated itself with United Future, a larger party. In the 2005 election, Outdoor Recreation stood candidates under the United Future banner. Check, as the new leader of Outdoor Recreation, was been placed seventh, the highest position for an Outdoor Recreation candidate. He also contested the Taupo electorate.