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10,300 | Book Review of Quantum Field Theory by Lewis H. Ryder | physics.pop-ph | Book Review of Quantum Field Theory by Lewis H. Ryder. An observation on
Ryder's derivation of Dirac equation is made. The review ends as, "A rare
combination of a thorough understanding and appreciation of the essential
logical structure of quantum field theory and deep pedagogic skills have
intermingled to create a m... | physics |
10,301 | Aging Random Walks | physics.pop-ph | Aging refers to the property of two-time correlation functions to decay very
slowly on (at least) two time scales. This phenomenon has gained recent
attention due to experimental observations of the history dependent relaxation
behavior in amorphous materials (``Glasses'') which pose a challenge to
theorist. Aging sign... | physics |
10,302 | Quantum-Classical System: Simple Harmonic Oscillator | physics.pop-ph | Problems concerning with application of quantum rules on classical phenomena
have been widely studied, for which lifted up the idea about quantization and
uncertainty principle. Energy quantization on classical example of simple
harmonic oscillator has been reviewed in this paper. | physics |
10,303 | Book Review: The Quantum Theory of Fields, Vol. I and II by S. Weinberg | physics.pop-ph | Review of the two volume set "The Quantum Theory of Fields" by S. Weinberg is
presented. | physics |
10,304 | A Simple Model for Predicting Sprint Race Times Accounting for Energy Loss on the Curve | physics.pop-ph | The mathematical model of J. Keller for predicting World Record race times,
based on a simple differential equation of motion, predicted quite well the
records of the day. One of its shortcoming is that it neglects to account for a
sprinter's energy loss around a curve, a most important consideration
particularly in th... | physics |
10,305 | And the Winner Is . . . Predicting the Outcome of the 150m Showdown | physics.pop-ph | Using the model framework for curve running as described in physics/9704022,
the possible outcome of the 150m "One to One" showdown between sprinters
Donovan Bailey and Michael Johnson are discussed (to be run 01 Jun 1997 at
Skydome in Toronto, Ontario, Canada). | physics |
10,306 | What really are the best 100m performances? | physics.pop-ph | A quick and fun investigation into the effects of correcting for wind
assistance/resistance and drag on 100m sprint performances. Considered are
World 100m rankings, as well as Canadian rankings | physics |
10,307 | Testing the Sprint Curve Model using the 150m Bailey-Johnson Showdown | physics.pop-ph | Recently, a simple model was derived to account for a sprinter's energy loss
around a curve, based on previous sprint models for linear races. This paper
offers a quick test of the model's precision by comparing split times from
Donovan Bailey's 150m ``Challenge of Champions'' race at Skydome on June 1st,
1997. The dis... | physics |
10,308 | What was the fastest 100m final? | physics.pop-ph | In a previous article (physics/9705004), the best 100m performances in track
and field were determined by accounting for wind effects and atmospheric drag.
In this report, I seek to ascertain what was the "fastest" 100m final through a
statistical analysis of the competitors' times. Considered are the 100 finals
from t... | physics |
10,309 | Another Dash into the Record Books (wind: -2.1 m/s) | physics.pop-ph | In the wake of numerous injuries and Donovan Bailey's media-stamped "sub-par"
100m victory of 10.03s at the 1997 Canadian Track and Field Championships, a
medal hope at the 1997 World Championships seems grim for the Olympic Champion
and World Record holder. However, when one considers that the 10.03s was run
into a he... | physics |
10,310 | It's a Wrap! Reviewing the 1997 Outdoor Season | physics.pop-ph | The 100m world rankings of the 1997 outdoor track and field competition
season are reviewed, subject to corrections for wind effects and atmospheric
drag. The rankings and times are compared with those of 1996, and the
improvements of each athlete over the course of a year are discussed.
Additionally, the athletes' win... | physics |
10,311 | How Good Can We Get? Using mathematical models to predict the future of athletics | physics.pop-ph | Track and field world records have risen and fallen throughout the history of
the sport. A recent rash of record-breaking performances has prompted the
question: "How good can we get?". This article offers a review of several
attempts to answer this question, based on mathematical modeling of key
physiological processe... | physics |
10,312 | Integers and Fractions | physics.pop-ph | This article briefly reviews the quantum Hall effect and the contributions of
the winners of the 1998 Nobel Prize in Physics. | physics |
10,313 | Physics in a Mirror: The TRIUMF 221 MeV pp Parity Violation Experiment | physics.pop-ph | We measure the difference in the scattering probability when an experiment
scattering longitudinally polarized 221 MeV protons from liquid hydrogen is
replaced by its mirror image. The result depends on the interplay between the
weak and strong interactions in the interesting region near the surface of the
proton. The ... | physics |
10,314 | Night Thoughts of a Quantum Physicist | physics.pop-ph | The most dramatic developments in theoretical physics in the next millennium
are likely to come when we make progress on so far unresolved foundational
questions. In this essay I consider two of the deepest problems confronting us,
the measurement problem in quantum theory and the problem of relating
consciousness to t... | physics |
10,315 | Blind spot may reveal vacuum radiation | physics.pop-ph | This is a Physics World features paper on Chen-Tajima proposal to detect
Unruh radiation by means of high-intensity lasers (PRL 83, 256 (1999)). | physics |
10,316 | 9.84 vs. 9.84: The Battle of Bruny and Bailey | physics.pop-ph | At the recent 1999 World Athletics Championships in Sevilla, Spain, Canada's
Bruny Surin matched Donovan Bailey's National and former World Record 100 m
mark of 9.84 s. The unofficial times for each, as read from the photo-finish,
were 9.833 s and 9.835 s respectively. Who, then, is the fastest Canadian of
all time? A ... | physics |
10,317 | A realistic quasi-physical model of the 100 metre dash | physics.pop-ph | A quasi-physical model (having both physical and mathematical roots) of
sprint performances is presented, accounting for the influence of drag
modification via wind and altitude variations. The race time corrections for
both men and women sprinters are discussed, and theoretical estimates for the
associated drag areas ... | physics |
10,318 | The Legality of Wind and Altitude Assisted Performances in the Sprints | physics.pop-ph | Based on a mathematical simulation which reproduces accurate split and
velocity profiles for the 100 and 200 metre sprints, the magnitudes of altitude
and mixed wind/altitude-assisted performances as compared to their sea-level
equivalents are presented. It is shown that altitude-assisted times for the 200
metre are si... | physics |
10,319 | The Dark Universe: The First Molecules | physics.pop-ph | The dark Universe corresponds to the period between the thermal decoupling
matter-radiation and the formation of the first objects. During this epoq,
molecules can appeared. In this talk, I will recall the nucleosynthesis
processes, then the chemistry of the primordial Universe. I will discuss the
influence of the prim... | physics |
10,320 | Short popular review of quantum electromagnetodynamics | physics.pop-ph | The aim of this note is to give a short and popular review of the ideas which
led to my model of magnetic monopoles (hep-ph/9708394) and my prediction of the
second kind of electromagnetic radiation. I will also point out the many and
far-reaching consequences if these magnetic photon rays would be confirmed. | physics |
10,321 | The quantum mechanical foundations of philosophy | physics.pop-ph | Many of the most familiar features of our everyday environment, and some of
our basic notions about it, stem from Relativistic Quantum Field Theory (RQFT).
We argue in particular that the origin of common names, verbs, adjectives such
as full and empty, the concepts of identity, similarity, Plato's Universals,
natural ... | physics |
10,322 | Key observational tests of the modern cosmology | physics.pop-ph | Over the last decade, cosmological observations have attained a level of
precision which allows for detailed comparison with theoretical predictions. In
this paper, we briefly review some studies of the current and prospected
constraints imposed by measurements of the cosmic microwave background
radiation, of the mass ... | physics |
10,323 | Research News : Direct observation of neutrino oscillations at the Sudbury Neutrino Observatory | physics.pop-ph | A brief description of the path-breaking evidence for the observation of
neutrino oscillations at the Sudbury Neutrino Observatory is presented and the
experimental principles and theory thereof are briefly discussed. | physics |
10,324 | The basis of discontinuous motion | physics.pop-ph | We show that the instant motion of particle should be essentially
discontinuous and random. This gives the logical basis of discontinuous motion.
Since what quantum mechanics describes is the discontinuous motion of
particles, this may also answer the question 'why the quantum?'. | physics |
10,325 | Science In Trauma | physics.pop-ph | Quantum theory has been proved as an outstanding mystery in modern science.
The predictions of science have turned out to be probabilistic. The principle
of determinism has failed. For systems like weather, earthquakes, rolling dices
etc... and of course human behavior it has proved impossible, for science, to
describe... | physics |
10,326 | Quantum Gravity Phenomenology | physics.pop-ph | I give a brief non-technical review of "Quantum Gravity Phenomenology" and in
particular I describe some studies which should soon allow to establish
valuable data-based constraints on the short-distance structure of spacetime. | physics |
10,327 | World Space Observatory/Ultraviolet (WSO/UV): Progress Report | physics.pop-ph | The World Space Observatory/Ultraviolet (WSO/UV) represents a new mission
implementation model for large space missions for astrophysics. The process has
been brought up to enable, fully scientific needs driven, a logic to be applied
to the demands for large collection powers required to undertake space missions
which ... | physics |
10,328 | Quantitative analysis of directional spontaneous emission spectra from light sources in photonic crystals | physics.pop-ph | We have performed angle-resolved measurements of spontaneous-emission spectra
from laser dyes and quantum dots in opal and inverse opal photonic crystals.
Pronounced directional dependencies of the emission spectra are observed:
angular ranges of strongly reduced emission adjoin with angular ranges of
enhanced emission... | physics |
10,329 | Einstein y la Geometria | physics.pop-ph | This is a semipopular introduction to the Special and General Theory of
Relativity, with special emphasis on the geometrical aspects of both theories
and their physical implications. | physics |
10,330 | Aesthetic complexity | physics.pop-ph | Aesthetics, among other criteria, can be statistically examined in terms of
the complexity required for creating and decrypting a work of art. We propose
three laws of aesthetic complexity. According to the first law of aesthetic
complexity, too condensed encoding makes a decryption of a work of art
impossible and is p... | physics |
10,331 | The Effects of Temperature, Pressure, and Humidity Variations on 100 Meter Sprint Performances | physics.pop-ph | It is well known that ``equivalent'' sprint race times run with different
accompanying wind speeds or at different altitudes are anything but equivalent
races. The drag force acting on a sprinter is a function of air density and the
relative wind speed, where the former has traditionally been calculated using
the race ... | physics |
10,332 | The Effects of Temperature, Humidity and Barometric Pressure on Short Sprint Race Times | physics.pop-ph | A numerical model of 100 m and 200 m world class sprinting performances is
modified using standard hydrodynamic principles to include effects of air
temperature, pressure, and humidity levels on aerodynamic drag. The magnitude
of the effects are found to be dependent on wind speed. This implies that
differing atmospher... | physics |
10,333 | The LHC, shining light on the Dark Side | physics.pop-ph | Starting in the summer of 2007, the Large Hadron Collider (LHC) will collide
proton beams at center-of-mass energies of 14 TeV exceeding by a factor of ten
what was previously achieved. It will be located in the 27km long underground
tunnel, in which the Large Electron Positron collider (LEP) was working until
the year... | physics |
10,334 | Cosmological Singularities | physics.pop-ph | In this expository article we describe the attempt of defining cosmological
singularities and we discuss their meaning in classical and quantum cosmology. | physics |
10,335 | Gamow's bicycle: The Appearance of Bodies at Relativistic Speeds and Apparent Superluminal Velocities | physics.pop-ph | A human creates an image basing on the information delivered by photons that
arrived at his retina simultaneously. Due to finite and constant velocity of
light these photons left the moving body at different times, since not all
points of the body are equidistant. In other words its image represents the
body as it was ... | physics |
10,336 | Interdisciplinary Monte Carlo Simulations | physics.pop-ph | Biological, linguistic, sociological and economical applications of
statistical physics are reviewed here. They have been made on a variety of
computers over a dozen years, not only at the NIC computers. A longer
description can be found in our new book, an emphasis on teaching in
Eur.J.Phys. 26, S 79 and AIP Conf. Pro... | physics |
10,337 | Release angle for attaining maximum distance in the soccer throw-in | physics.pop-ph | We investigated the release angle that maximises the distance attained in a
long soccer throw-in. One male soccer player performed maximum-effort throws
using release angles of between 10 and 60 degrees, and the throws were analysed
using 2-D video. The player's optimum release angle was calculated by
substituting math... | physics |
10,338 | Do we really need the Anthropic Principle? | physics.pop-ph | Dalai Lama suggested a healthy dose of skepticism toward religious
pronouncements | physics |
10,339 | Induced order and reentrant melting in classical two-dimensional binary clusters | physics.pop-ph | A binary system of classical charged particles interacting through a dipole
repulsive potential and confined in a two-dimensional hardwall trap is studied
by Brownian dynamics simulations. We found that the presence of small particles
\emph{stabilizes} the angular order of the system as a consequence of radial
fluctuat... | physics |
10,340 | Scattering of a Baseball by a Bat | physics.pop-ph | A ball can be hit faster if it is projected without spin but it can be hit
farther if it is projected with backspin. Measurements are presented in this
paper of the tradeoff between speed and spin for a baseball impacting a
baseball bat. The results are inconsistent with a collision model in which the
ball rolls off th... | physics |
10,341 | The Effect of Spin on the Flight of a Baseball | physics.pop-ph | New measurements are presented of the lift on a spinning baseball. The
experiment utilizes a pitching machine to project the baseball horizontally; a
high-speed motion capture system to measure the initial velocity and angular
velocity and to track the trajectory over ~5 m of flight; and a ruler to
measure the total di... | physics |
10,342 | Quantum mechanics from a universal action reservoir | physics.pop-ph | A heuristic derivation of quantum mechanics using information theory requires
a foundational physical principle: the existence of a universal action
reservoir, analogous to the energy reservoir of a canonical ensemble. | physics |
10,343 | Superstring theories | physics.pop-ph | We briefly review superstring theories, highlighting the important concepts,
developments, and open problems of the subject. | physics |
10,344 | Friendly units for coldness | physics.pop-ph | Measures of temperature that center around human experience get lots of use.
Of course thermal physics insights of the last century have shown that
reciprocal temperature (1/kT) has applications that temperature addresses less
well. In addition to taking on negative absolute values under population
inversion (e.g. of m... | physics |
10,345 | Unification, the Big Bang, and the Cosmological Constant | physics.pop-ph | The two major goals in fundamental physics are: 1) Unification of all forces
incorporating relativity and quantum theory, 2) Understanding the origin and
evolution of the Universe as well as explaining the smallness of the
cosmological constant.
Several efforts have been made in the last few decades towards achieving... | physics |
10,346 | Predicting Baseball Home Run Records Using Exponential Frequency Distributions | physics.pop-ph | A new model, which uses the frequency of individuals' annual home run totals,
is employed to predict future home run totals and records in Major League
Baseball. Complete home run frequency data from 1903--2005 is analyzed,
resulting in annual exponential distributions whose changes can be a used as a
measure of progre... | physics |
10,347 | A novel dual-band balun based on the dual structure of composite right/left handed transmission line | physics.pop-ph | Utilizing the opposite phase shifting property of a standard Composite
Right/Left Handed (CRLH) transmission line (TL) and a dual structure of CRLH
(D-CRLH) TL, a dual-band balun is designed. The dual-band balun is formed by a
1x2 (3-dB) splitter with a D-CRLH phase-shifting line in the top branch and a
CRLH phase-shif... | physics |
10,348 | String Theory and Einstein's Dream | physics.pop-ph | This article contains a short review of the current status of string theory. | physics |
10,349 | Albert Einstein: His Annus Mirabilis 1905 | physics.pop-ph | Einstein in 1905, his year of miracles, wrote five papers which mark a
watershed between classical physics and modern physics. They dealt with problem
of reality of atoms, theory of special relativity which overthrew Newtonian
conceptions of space and time, and his revolutionary light quantum hypothesis
which together ... | physics |
10,350 | On the quality of the Olmec mirrors and its utilization | physics.pop-ph | Archaeological mirrors from the Olmec civilization were analyzed in the
context of bibliography produced in the last two decades. Photographs of its
images are showed as a proof of its good quality. Some suggestions are made on
its probable utilization. | physics |
10,351 | Olmec mirrors: an example of archaeological American mirrors | physics.pop-ph | Archaeological mirrors from the Olmec civilization are described according to
bibliographic references and to personal observations and photographs. | physics |
10,352 | Intelligent Life in Cosmology | physics.pop-ph | I shall present three arguments for the proposition that intelligent life is
very rare in the universe. First, I shall summarize the consensus opinion of
the founders of the Modern Synthesis (Simpson, Dobzhanski, and Mayr) that the
evolution of intelligent life is exceedingly improbable. Second, I shall
develop the Fer... | physics |
10,353 | The Truth About Ballistic Coefficients | physics.pop-ph | The ballistic coefficient of a bullet describes how it slows in flight due to
air resistance. This article presents experimental determinations of ballistic
coefficients showing that the majority of bullets tested have their previously
published ballistic coefficients exaggerated from 5-25% by the bullet
manufacturers.... | physics |
10,354 | An Acoustic Method for Determining Ballistic Coefficients | physics.pop-ph | This paper presents a method for using a PC soundcard, microphone and a
chronograph to determine bullet BC with an accuracy of 6%. This is useful when
a second chronograph is unavailable or when the projectile accuracy is
insufficient to use a far chronograph. | physics |
10,355 | Sending and Searching for Interstellar Messages | physics.pop-ph | There is a close interrelation between Searching for Extraterrestrial
Intelligence (SETI) and Messaging to Extraterrestrial Intelligence (METI). For
example, the answers to the questions "Where to search" and "Where to send" are
equivalent, in that both require an identical selection from the same target
star lists. Si... | physics |
10,356 | Physics in Carnacki's investigations | physics.pop-ph | In the stories of Carnacki, created by the English writer William H. Hodgson
and written between 1910 and 1912, we find an interesting mixture of science
and fantasy. In spite of the fact that Carnacki is a ghost finder, who
investigates in an environment where supernatural is acting, we see the
character using technol... | physics |
10,357 | Tunneling Anisotropic Magnetoresistance in Co/AlOx/Au Tunnel Junctions | physics.pop-ph | We observe spin-valve-like effects in nano-scaled thermally evaporated
Co/AlOx/Au tunnel junctions. The tunneling magnetoresistance is anisotropic and
depends on the relative orientation of the magnetization direction of the Co
electrode with respect to the current direction. We attribute this effect to a
two-step magn... | physics |
10,358 | Fourier optics for polymeric substrates and coating textures analysis | physics.pop-ph | Several devices for substrate texture detection based on diffractive optics,
for paper, textiles and non-wovens have been proposed in the past for direct
inspection during the production processes. In spite of the presence of devices
totally based on image processing, the use of diffractive optics cannot be
considered ... | physics |
10,359 | Plasma treatment advantages for textiles | physics.pop-ph | The textile industry is searching for innovative production techniques to
improve the product quality, as well as society requires new finishing
techniques working in environmental respect. Plasma surface treatments show
distinct advantages, because they are able to modify the surface properties of
inert materials, som... | physics |
10,360 | Paradoxical popups: Why are they hard to catch? | physics.pop-ph | Even professional baseball players occasionally find it difficult to
gracefully approach seemingly routine pop-ups. This paper describes a set of
towering pop-ups with trajectories that exhibit cusps and loops near the apex.
For a normal fly ball, the horizontal velocity is continuously decreasing due
to drag caused by... | physics |
10,361 | Recurrence plots of sunspots, solar flux and irradiance | physics.pop-ph | The paper shows the recurrence and cross recurrence plots of three time
series, concerning data of the solar activity. The data are the sunspot number
and the values of solar radio flux at 10.7 cm and of solar total irradiance,
which are known as highly correlated. To compare the series, the radio flux and
irradiance v... | physics |
10,362 | Putting the Warp into Warp Drive | physics.pop-ph | Over the last decade, there has been a respectable level of scientific
interest regarding the concept of a warp drive. This is a hypothetical
propulsion device that could theoretically circumvent the traditional
limitations of special relativity which restricts spacecraft to sub-light
velocities. Any breakthrough in th... | physics |
10,363 | Role of Compaction Ratio in the Mathematical Model of Progressive Collapse | physics.pop-ph | We derive a mathematical model of progressive collapse and examine role of
compaction. Contrary to a previous result by Ba\v{z}ant and Verdure, J. Engr.
Mech. ASCE 133 (2006) 308, we find that compaction slows down the avalanche by
effectively increasing the resistive force. We compare currently available
estimates of ... | physics |
10,364 | Some new reflections on Mr. Palomar | physics.pop-ph | The character Mr. Palomar, the alter-ego of the Italian author Italo Calvino,
appeared for the first time in 1975 on the pages of the "Il Corriere della
Sera", and then more or less regularly till its debut as a book in 1983.
Through illuminating thoughts and reflections based on observations, for
instance, of sea wave... | physics |
10,365 | Time turns the universal kaleidoscope | physics.pop-ph | This (withdrawn) creative essay intended to consider the appearance of time's
arrow in a fully symmetric universe compatible with "pilot wave" or
transactional interpretations (D. Bohm or J.G. Kramer, respectively). The
(unstated) hypothesis was that, despite unitary time evolution, the inherent
Hilbert transform opera... | physics |
10,366 | Acoustic methods for measuring bullet velocity | physics.pop-ph | This article describes two acoustic methods to measure bullet velocity with
an accuracy of 1% or better. In one method, a microphone is placed within 0.1 m
of the gun muzzle and a bullet is fired at a steel target 45 m away. The
bullet's flight time is the recorded time between the muzzle blast and sound of
hitting the... | physics |
10,367 | Book review of SUPERSTITION by Robert Park | physics.pop-ph | The 2008 book Superstition: Belief in the age of science, by Robert Park,
published by Princeton University Press is briefly reviewed. | physics |
10,368 | Luce, Trasparenze e Cinema tra Arte e Scienza - Light, Transparency and Cinema between Art and Science | physics.pop-ph | From light and physical phenomena to cinema, an interdisciplinary percourse
between art and science, from historical and critical references to the
ultimate digital frontiers, including digital movies revolution, stereoscopy,
holography, interfaces.
-----
Dalla luce ed i fenomeni fisici al cinema, un percorso inter... | physics |
10,369 | Measuring thrust and predicting trajectory in model rocketry | physics.pop-ph | Methods are presented for measuring thrust using common force sensors and
data acquisition to construct a dynamic force plate. A spreadsheet can be used
to compute trajectory by integrating the equations of motion numerically. These
techniques can be used in college physics courses, and have also been used with
high sc... | physics |
10,370 | Hubble, Hubble's law and the expanding universe | physics.pop-ph | Hubble's name is associated closely with the idea of an expanding universe as
he discovered the relation between the recession velocity and distances of
galaxies. Hubble also did a lot of pioneering work on the distribution of
galaxies in the universe. In this article we take a look at Hubble's law and
discuss how it r... | physics |
10,371 | States of matter | physics.pop-ph | This is a written version of a popular science talk for school children given
on India's National Science Day 2009 at Mumbai. I discuss what distinguishes
solids, liquids and gases from each other. I discuss briefly granular matter
that in some ways behave like solids, and in other ways like liquids. | physics |
10,372 | The Multiverse Hierarchy | physics.pop-ph | I survey physics theories involving parallel universes, arguing that they
form a natural four-level hierarchy of multiverses allowing progressively
greater diversity. Level I: A generic prediction of inflation is an infinite
ergodic universe, which contains Hubble volumes realizing all initial
conditions -- including a... | physics |
10,373 | Difference Principle and Black-hole Thermodynamics | physics.pop-ph | The heuristic principle that constructive dynamics may arise wherever there
exists a difference, or gradient, is discussed. Consideration of black-hole
entropy appears to provide a clue for setting a lower bound on any extensive
measure of such collective system difference, or potential to give rise to
constructive dyn... | physics |
10,374 | At the root of things | physics.pop-ph | Modern theories of fundamental interactions describe strong, electromagnetic
and weak interactions as quantum field theories with certain kinds of embedded
internal symmetries called `gauge symmetries'. This article introduces quantum
field theories and gauge symmetries to the uninitiated. | physics |
10,375 | Why the Kirnberger Kernel Is So Small | physics.pop-ph | Defining the musical interval of the Kirnberger kernel, or Kirn-kern, to be
one-twelfth the atom of Kirnberger, or the difference between a grad and a
schisma, its natural logarithm, k = (161/12)\ln{2}-7\ln{3}-\ln{5}, is extremely
small, k ~ 0.000000739401. Here an explanation of this coincidence is given by
showing th... | physics |
10,376 | Communicating Science to the Media | physics.pop-ph | It's impossible to anticipate everything a reporter will ask you, but this
media training will teach you how to prepare for interviews with print,
television or radio journalists and increase your understanding of how to
communicate effectively through the media. | physics |
10,377 | Nanotrend : studying nano-districts gives a new view on nanoscience | physics.pop-ph | The emergence of districts in nanotechnology represents a new pattern of
scientific development. The factors affecting their growth are analysed to
understand the drivers of economic development. By analyzing the top 200
nano-districts, Nanotrendchart sheds light on the clusterization process:
academic production is se... | physics |
10,378 | The force, power and energy of the 100 meter sprint | physics.pop-ph | At the 2008 Summer Olympics in Beijing, Usain Bolt broke the world record for
the 100 m sprint. Just one year later, at the 2009 World Championships in
Athletics in Berlin he broke it again. A few months after Beijing, Eriksen et
al. studied Bolt's performance and predicted that Bolt could have run about
one-tenth of a... | physics |
10,379 | Evolution and Earth's Entropy | physics.pop-ph | Entropy decreases on the Earth due to day/night temperature differences. This
decrease exceeds the decrease in entropy on the Earth related to evolution by
many orders of magnitude. Claims by creationists that science is somehow
inconsistent with regard to evolution are thus show to be baseless. | physics |
10,380 | Pseudo-Degeneracy in Handbell Modes | physics.pop-ph | The vibrational modes of handbells exist in nearly-degenerate pairs which
have been split by nonuniformities in the bell. The possibility of
intentionally re-combining a pair into pseudo-degeneracy was explored by adding
mass to various locations on a C4 handbell. Depending on the location and mass
added to the bell, t... | physics |
10,381 | Numerical Solution of Differential Equations by the Parker-Sochacki Method | physics.pop-ph | A tutorial is presented which demonstrates the theory and usage of the
Parker-Sochacki method of numerically solving systems of differential
equations. Solutions are demonstrated for the case of projectile motion in air,
and for the classical Newtonian N-body problem with mutual gravitational
attraction. | physics |
10,382 | Quark Model and multiquark system | physics.pop-ph | The discovery of many particles, especially in the 50's, when the firsts
accelerators appeared, caused the searching for a model that would describe in
a simple form the whole of known particles. The Quark Model, based in the
mathematical structures of group theory, provided in the beginning of the 60's
a simplified de... | physics |
10,383 | Corked Bats, Juiced Balls, and Humidors: The Physics of Cheating in Baseball | physics.pop-ph | Three separate questions of relevance to Major League Baseball are
investigated from a physics perspective. First, can a baseball be hit farther
with a corked bat? Second, is there evidence that the baseball is more lively
today than in earlier years? Third, can storing baseballs in a temperature- or
humidity-controlle... | physics |
10,384 | Conicoid Mirrors | physics.pop-ph | The first order equation relating object and image location for a mirror of
arbitrary conic-sectional shape is derived. It is also shown that the parabolic
reflecting surface is the only one free of aberration and only in the limiting
case of distant sources. | physics |
10,385 | Une Chaine de Mesure Permettant de Caracteriser la Performance en Voile | physics.pop-ph | This paper presents the experimental set-up and the analysis tools developed
for the performance evaluation in sailing. The measurement system is composed
of sensors for the position and attitude of the sail boat, sensors for the wind
measurement and some tools for the coach. | physics |
10,386 | The effect of Mounted Ribs on the Radiation of a Soundboard | physics.pop-ph | The grand piano is one of the most important instruments in western music.
Its functioning and details are investigated and understood to a reasonable
level, however, differences between manufacturers exist which are hard to
explain. To add a new piece of understanding, we decided to investigate the
effect of ribs moun... | physics |
10,387 | Relativistically speaking: Let's walk or run through the rain? | physics.pop-ph | We analyse under a simple approach the problem one must decide the best
strategy to minimize the contact with rain when moving between two points
through the rain. The available strategies: walk (low speed boost $<<$ $c$) or
run (relativistic speed boost $\approx$ $c$). | physics |
10,388 | Fazendo 3D com uma camera so | physics.pop-ph | A simple system to make stereo photography or videos based in just two
mirrors was made in 1989 and recently adapted to a digital camera setup. | physics |
10,389 | The heavy spring at work | physics.pop-ph | Springs are used in simple demonstrations for the students of Physics classes
to illustrate the Hooke's Law and harmonic oscillations. The spring is usually
considered as a light object that does not possess a mass. What happens if the
spring is heavy, that is, if its mass is not negligible? This paper aims to
discuss ... | physics |
10,390 | On the Paradox of Chilling Water: Crossover Temperature in the Mpemba Effect | physics.pop-ph | Unlike most of the research on the Mpemba effect which has focused on
verifying the observation that warm water freezes faster than cold water, our
work quantitatively investigates the rates at which hot and cold water cool and
the point at which hot water reaches a lower temperature than cold water under
a set of exte... | physics |
10,391 | High-speed measurement of rifle primer blast waves | physics.pop-ph | This article describes a method and results for direct high-speed
measurements of rifle primer blast waves employing a high-speed pressure
transducer located at the muzzle to record the blast pressure wave produced by
primer ignition. Our key findings are: 1) Most of the primer models tested show
5-12% standard deviati... | physics |
10,392 | Why is the earth not burning ? The earth radiative energy balance | physics.pop-ph | The concept of energy balance is a key one in climate science. Yet, students
may find it counterintuitive: while it is obvious that some energy comes in
from the sun, the part coming out is more elusive. Asking them why the earth is
not burning after billions of years of exposure to the sun, takes them to the
question ... | physics |
10,393 | How does a drinking straw balance work? | physics.pop-ph | We examine working mechanism of a drinking straw balance. Unlike the usual
horizontal level balances which rely on the pivotal rotation, a drinking straw
balance shows rolling motion. Because of this rolling and relative position
between the pin and the center line of a straw, a new equilibrium state is
possible after ... | physics |
10,394 | Quantum Entanglement and Teleportation | physics.pop-ph | Even Einstein has to be wrong sometimes. However, when Einstein was wrong he
created a 70 year debate about the strange behavior of quantum mechanics. His
debate helped prove topics such as the indeterminacy of particle states,
quantum entanglement, and a rather clever use of quantum entanglement known as
quantum telep... | physics |
10,395 | On the maximum sufficient range of interstellar vessels | physics.pop-ph | This paper considers the likely maximum range of space vessels providing the
basis of a mature interstellar transportation network. Using the principle of
sufficiency, it is argued that this range will be less than three parsecs for
the average interstellar vessel. This maximum range provides access from the
Solar Syst... | physics |
10,396 | Would contact with extraterrestrials benefit or harm humanity? A scenario analysis | physics.pop-ph | While humanity has not yet observed any extraterrestrial intelligence (ETI),
contact with ETI remains possible. Contact could occur through a broad range of
scenarios that have varying consequences for humanity. However, many
discussions of this question assume that contact will follow a particular
scenario that derive... | physics |
10,397 | Fernando Sanford and the "Kirlian effect" | physics.pop-ph | In 1894 Fernando Sanford discussed in a paper published by the Physical
Review an electric photography technique, which he developed starting from
1891. The images that he published in the paper are clearly showing some
fringes about the objects he photographed. Several years after, the fringes
appearing in the electri... | physics |
10,398 | Mystery of the Cosmological Constant | physics.pop-ph | The 2011 Nobel prize in physics has been awarded to S. Perlmutter, A. Riess
and B. Schmidt for their path breaking discovery that the rate of expansion of
the universe is increasing with time. The trio used Type Ia supernovae (SNe Ia)
as standard candles to estimate their luminosity-distances. To appreciate some
of the... | physics |
10,399 | Is Reality Digital or Analog? | physics.pop-ph | A report of a discussion with Isaac Newton. | physics |
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