• Arhiiv
    • Eesti füüsikapäevad ja füüsikaõpetajate päevad
      • 2017.a. füüsikapäevad
      • 2016.a. füüsikapäevad
      • 2015. a. füüsikapäevad
      • 2003.a. füüsikaõpetajate päev
    • EFS Täppisteaduste Suve- ja Sügiskoolid
      • 2017.a. sügiskool
      • 2016.a. sügiskool
      • 2015.a. sügiskool
      • 2014.a. sügiskool
      • 2013.a. suvekool
      • 2013.a. sügiskool
      • 2012.a. suvekool
      • 2012.a. sügiskool
      • 2011. a. suvekool
      • 2010. a. suvekool
      • 2010.a. sügiskool
      • 2009.a. sügiskool
      • 2008.a. suvekool
      • 2008.a. sügiskool
      • 2007. a. suvekool
      • 2007.a. sügiskool
      • 2006.a. suvekool
      • 2005.a. suvekool
      • 2005.a. sügiskool
      • 2004.a. suvekool
      • 2004.a. sügiskool
    • Füüsika õpetajate sügisseminarid Voorel
      • Voore 2017
      • Voore 2015
      • Voore 2011
      • Voore 2009
    • EFS aastaraamatud
    • Teaduslaagrid
    • Akadeemiline füüsikaolümpiaad
    • Tähe perepäevad TÄPE

FYYSIKA.EE

Elu, loodus, teadus ja tehnoloogia

  • Eestist endast
    • Arvamus
    • Teated
    • Persoon
    • Eesti füüsikaolümpiaadid
  • Teadusuudised
    • Eesti teadusuudised
      • Tartu Ülikool
      • KBFI
      • Tallinna Tehnikaülikool
      • Tõravere Observatoorium
    • FYYSIKA.EE hoiab silma peal – Teemad
    • Referaadinurgake
    • Päevapilt
  • Eesti Füüsika Selts
    • Teadusbuss
    • Füüsika, keemia ja bioloogia õpikojad
    • Füüsika e-õpikud
    • Eesti Füüsika Seltsi põhikiri
  • Füüsikaõpetajate osakond
    • Füüsikaõpetajate võrgustik
  • Füüsikaüliõpilaste Selts
  • Kontakt

NASA Holds Media Opportunities to Discuss Rising Sea Levels

20.08.2015 by Kaido Reivelt

In a series of media opportunities Wednesday, Aug. 26, through Friday, Aug. 28, NASA experts will present an up-to-date global outlook on current conditions and future projections of sea level rise.

Filed Under: RSS Kosmos

Colorful Calendar Celebrates 12th Anniversary of NASA’s Spitzer

20.08.2015 by Kaido Reivelt

Relive the highlights of NASA’s Spitzer Space Telescope mission with a new digital calendar.

Filed Under: RSS Kosmos

Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube

20.08.2015 by Kaido Reivelt

Author(s): M. G. Aartsen et al. (IceCube Collaboration)

Using Earth as a neutrino filter, the IceCube neutrino experiment strengthens its claim that it has detected neutrinos from powerful astrophysical accelerators outside our Galaxy.


[Phys. Rev. Lett. 115, 081102] Published Thu Aug 20, 2015

Filed Under: RSS Teadus

The tumultuous heart of our Galaxy

20.08.2015 by Kaido Reivelt

This new image of powerful remnants of dead stars and their mighty action on the surrounding gas from ESA’s XMM-Newton X-ray observatory reveals some of the most intense processes taking place at the centre of our galaxy, the Milky Way.

Filed Under: RSS Kosmos

Scientists think “planetary pebbles” were the building blocks for the largest planets

20.08.2015 by Kaido Reivelt

The study shows that pebble accretion can produce the observed structure of the solar system as long as the pebbles formed slowly enough that the growing gas giant planets have time to gravitationally interact with one another.

Filed Under: RSS Kosmos

Mars rover moves onward after “Marias Pass” studies

20.08.2015 by Kaido Reivelt

Curiosity investigated a geological contact zone and rocks that are unexpectedly high in silica and hydrogen content.

Filed Under: RSS Kosmos

NASA: California Drought Causing Valley Land to Sink

19.08.2015 by Kaido Reivelt

A new NASA report shows land in California’s San Joaquin Valley is sinking faster than ever as Californians continue pumping groundwater in response to the historic drought.

Filed Under: RSS Kosmos

NASA: There is No Asteroid Threatening Earth

19.08.2015 by Kaido Reivelt

NASA scientists provide real science to debunk wild Internet rumors about an alleged September asteroid impact.

Filed Under: RSS Kosmos

Observation of a New Narrow Axial-Vector Meson a_{1} (1420)

19.08.2015 by Kaido Reivelt

Author(s): C. Adolph et al. (COMPASS Collaboration)A new axial-vector meson is observed during the diffractive reaction of pions on a hydrogen target.[Phys. Rev. Lett. 115, 082001] Published Wed Aug 19, 2015

Filed Under: RSS Teadus

Secret of Rosetta’s cool

19.08.2015 by Kaido Reivelt

Technology image of the week: what look like Venetian blinds have been crucial to keep Rosetta’s temperature regulated

Filed Under: RSS Kosmos

Solar system formation doesn’t mean a thing without that spin

19.08.2015 by Kaido Reivelt

New modeling shows that the supernova shock wave that helped form the Sun also could be responsible for the spin of our solar system.

Filed Under: RSS Kosmos

ESA’s next astronaut to go into space arrives at launch site

19.08.2015 by Kaido Reivelt

ESA astronaut Andreas Mogensen, Soyuz spacecraft commander Sergei Volkov and Kazakh cosmonaut Aidyn Aimbetov arrived in Baikonur, Kazakhstan, yesterday. This is their last destination before heading to the International Space Station in th…

Filed Under: RSS Kosmos

Technology CubeSat hitch-hiker on today’s HTV launch

19.08.2015 by Kaido Reivelt

Today’s HTV supply launch from Japan to the International Space Station also marks the arrival in orbit of one of ESA’s smallest missions yet – a CubeSat which will test miniaturised technologies for space, set to be followed by many more in coming years.

Filed Under: RSS Kosmos

Cosmic fire

19.08.2015 by Kaido Reivelt

Human spaceflight and operations image of the week: aurora over Concordia research station in Antarctica

Filed Under: RSS Kosmos

Linear halogen bulb as a powerful light source for physics experiments

19.08.2015 by Kaido Reivelt

The paper describes the usage of a conventional lamp equipped with a linear halogen bulb for physics
experiments. The irradiance gain and limitation of spectral resolution are treated in detail
theoretically and verified experimentally. The analysis …

Filed Under: RSS Füüsikaharidus

Stability of vertical and horizontal axis Levitrons

19.08.2015 by Kaido Reivelt

The stability of the new horizontal axis Levitron 3 is compared with that of the vertical axis
device. The rotation frequency ranges are similar because they are determined by the same
precessional micro-trap, for which some theory is given. But the …

Filed Under: RSS Füüsikaharidus

NASA Mars Rover Moves Onward After ‘Marias Pass’ Studies

18.08.2015 by Kaido Reivelt

After taking a low-angle selfie at its latest drilling site, NASA’s Curiosity Mars rover has departed the area called “Marias Pass,” where it had been working since May.

Filed Under: RSS Kosmos

Send Your Name to Mars on NASA’s Next Red Planet Mission

18.08.2015 by Kaido Reivelt

Mars enthusiasts can participate in NASA’s journey to Mars by adding their names to a silicon microchip headed to Mars aboard NASA’s InSight Mars lander, scheduled to launch next year.

Filed Under: RSS Kosmos

New Area Law in General Relativity

18.08.2015 by Kaido Reivelt

Author(s): Raphael Bousso and Netta Engelhardt

A relation between the area of a novel class of surfaces and the thermodynamic entropy has been proven, extending the results of Hawking’s 1971 area theorem.


[Phys. Rev. Lett. 115, 081301] Published Tue Aug 18, 2015

Filed Under: RSS Teadus

Formation of Shear Bands in Drying Colloidal Dispersions

18.08.2015 by Kaido Reivelt

Author(s): Pree-Cha Kiatkirakajorn and Lucas GoehringExperiments explain why solidifying colloids sometimes form zigzagging stripes as they dry.[Phys. Rev. Lett. 115, 088302] Published Tue Aug 18, 2015

Filed Under: RSS Teadus

LADEE spacecraft finds neon in lunar atmosphere

18.08.2015 by Kaido Reivelt

The mission confirms that the Moon’s exosphere is made up of mostly helium, argon, and neon.

Filed Under: RSS Kosmos

Dark energy survey finds more celestial neighbors

18.08.2015 by Kaido Reivelt

New dwarf galaxy candidates could mean our sky is more crowded than we thought.

Filed Under: RSS Kosmos

Mirror, mirror…

17.08.2015 by Kaido Reivelt

Space Science Image of the Week: Mirrors like these will help JWST look back 13.5 billion years to see the first stars and galaxies forming.

Filed Under: RSS Kosmos

Celestial firework marks nearest galaxy collision

17.08.2015 by Kaido Reivelt

The newly discovered ring galaxy, dubbed Kathryn’s Wheel, is seven times closer than anything similar found before.

Filed Under: RSS Kosmos

First use of ISS astronaut pictures for light pollution studies

17.08.2015 by Kaido Reivelt

This study not only includes the well-known signatures of cities and streets, but also the effects of faint indirectly scattered light.

Filed Under: RSS Kosmos

Hydrodynamics Beyond the Gradient Expansion: Resurgence and Resummation

14.08.2015 by Kaido Reivelt

Author(s): Michal P. Heller and Michał Spaliński

The method of resurgence used in quantum field theories can address foundational aspects of relativistic hydrodynamics and its applicability to systems having large flow gradients.


[Phys. Rev. Lett. 115, 072501] Published Fri Aug 14, 2015

Filed Under: RSS Teadus

Week In Images

14.08.2015 by Kaido Reivelt

Our week through the lens: 10-14 August 2015

Filed Under: RSS Kosmos

Hubble finds supernovae in “wrong place at wrong time”

14.08.2015 by Kaido Reivelt

In a complicated mystery of double star systems, merging galaxies, and twin black holes, astronomers are explaining a series of unusual supernovae found beyond the typical confines of their galaxies.

Filed Under: RSS Kosmos

Cassini to Make Last Close Flyby of Saturn Moon Dione

13.08.2015 by Kaido Reivelt

NASA’s Cassini spacecraft will zip past Saturn’s moon Dione on Monday, Aug. 17 — the final close flyby of this icy satellite during the spacecraft’s long mission.

Filed Under: RSS Kosmos

Myanmar inundated

13.08.2015 by Kaido Reivelt

The Copernicus Emergency Management Service is using radar images from Sentinel-1A to map the devastating flood in Myanmar

Filed Under: RSS Kosmos

Rosetta’s big day in the Sun

13.08.2015 by Kaido Reivelt

ESA’s Rosetta today witnessed Comet 67P/Churyumov–Gerasimenko making its closest approach to the Sun. The exact moment of perihelion occurred at 02:03 GMT this morning when the comet came within 186 million km of the Sun. 

Filed Under: RSS Kosmos

Four-Dimensional Entropy from Three-Dimensional Gravity

13.08.2015 by Kaido Reivelt

Author(s): S. CarlipThe entropy of a black hole in loop quantum gravity is computed. The four-dimensional boundary term, that must be added to the loop quantum gravity action due to the presence of a black hole, maps to gravity in three dimensional spa…

Filed Under: RSS Teadus

Gravity and the Stability of the Higgs Vacuum

13.08.2015 by Kaido Reivelt

Author(s): Philipp Burda, Ruth Gregory, and Ian G. Moss

In some models, primordial black holes would have acted as seeds of Higgs vacuum decay reducing the Universe’s lifetime from trillions of years to fractions of a second. These regions of parameter space are thus ruled out.


[Phys. Rev. Lett. 115, 071303] Published Thu Aug 13, 2015

Filed Under: RSS Teadus

Astronomers discover “young Jupiter” exoplanet

13.08.2015 by Kaido Reivelt

The new planet, discovered using the Gemini Planet Imager, is a million times fainter than its parent star and shows the strongest methane signature ever detected on an alien world.

Filed Under: RSS Kosmos

Corrected sunspot history suggests climate change since the Industrial Revolution not due to natural solar trends

13.08.2015 by Kaido Reivelt

After uncovering a major calibration error, scientists show that the newly corrected sunspot numbers now provide a homogenous record of solar activity dating back some 400 years.

Filed Under: RSS Kosmos

Measurement of Maxwell’s displacement current

13.08.2015 by Kaido Reivelt

The measurement of Maxwell’s displacement current has remained a veritable challenge. Here we
present a novel approach that allows a detailed verification in a lecture hall-type experiment.

Filed Under: RSS Füüsikaharidus

Spectra generated by a non-central generalized Kratzer potential and explicit expressions for expectation values of r s in N -dimensions

13.08.2015 by Kaido Reivelt

Analytical solutions of the N -dimensional non-relativistic wave equation with the non-central
generalized Kratzer potential with arbitrary angular momentum have been investigated within the
framework of the asymptotic iteration method. In hyperspher…

Filed Under: RSS Füüsikaharidus

On time-dependent perturbation theory in matrix mechanics and time averaging

13.08.2015 by Kaido Reivelt

The time-dependent quantum perturbation theory developed by Born, Heisenberg and Jordan in 1926 is
revisited. We show that it not only reproduces the standard theory formulated in the interaction
picture, but also allows one to construct more accurat…

Filed Under: RSS Füüsikaharidus

Gecko Grippers Moving On Up

12.08.2015 by Kaido Reivelt

Geckos have inspired a technology to make things stick together in space.

Filed Under: RSS Kosmos

Observation of J/ψp Resonances Consistent with Pentaquark States in Λ_{b}^{0} →J/ψK^{−} p Decays

12.08.2015 by Kaido Reivelt

Author(s): R. Aaij et al. (LHCb Collaboration)A new type of particle containing five quarks has been observed by the LHCb experiment.[Phys. Rev. Lett. 115, 072001] Published Wed Aug 12, 2015

Filed Under: RSS Teadus

X-Ray Diffraction of Solid Tin to 1.2 TPa

12.08.2015 by Kaido Reivelt

Author(s): A. Lazicki, J. R. Rygg, F. Coppari, R. Smith, D. Fratanduono, R. G. Kraus, G. W. Collins, R. Briggs, D. G. Braun, D. C. Swift, and J. H. Eggert

Solid tin has been compressed to a record high pressure without undergoing melting.


[Phys. Rev. Lett. 115, 075502] Published Wed Aug 12, 2015

Filed Under: RSS Teadus

Trusty, not rusty, pipelines owe a debt to space

12.08.2015 by Kaido Reivelt

When a Dutch company working on soil pollution teamed up with ESA to build a better, bacteria-based air filter for space, they also created the foundation for a new way of keeping iron pipelines from corroding in the ground. 

Filed Under: RSS Kosmos

Ariane 6 and Vega C begin development

12.08.2015 by Kaido Reivelt

Today, ESA signed contracts for the development of the Ariane 6 new‑generation launcher, its launch base and the Vega C evolution of the current small launcher.

Filed Under: RSS Kosmos

Oxymoronic black hole provides clues to growth

12.08.2015 by Kaido Reivelt

By studying the lightest supermassive black hole found to date, scientists hope to better understand of such objects of different sizes grow.

Filed Under: RSS Kosmos

Rosetta sees comet’s fireworks display ahead of perihelion

12.08.2015 by Kaido Reivelt

The dramatic event on Comet 67P/Churyumov-Gerasimenko was so powerful that it even pushed away the incoming solar wind.

Filed Under: RSS Kosmos

Space’s Top 40: How CubeSats are Revolutionizing Radio Science

11.08.2015 by Kaido Reivelt

Next time you tune in to public radio or the hottest Top 40 radio station, you’ll be using some of the same tools NASA uses to unravel the mysteries of the universe.

Filed Under: RSS Kosmos

Rosetta Comet Outburst Captured

11.08.2015 by Kaido Reivelt

A dramatic outburst from Rosetta’s target comet is recorded by several instruments, including the Double Focusing Mass Spectrometer, which uses NASA-built electronics.

Filed Under: RSS Kosmos

Lightly thru space

11.08.2015 by Kaido Reivelt


Human spaceflight and operations image of the week: ESA’s Cebreros deep-space tracking station reflecting environmentally friendly light

Filed Under: RSS Kosmos

Astronomers discover a 10th transiting “Tatooine”

11.08.2015 by Kaido Reivelt

With the number of known circumbinary exoplanets now at 10, astronomers can begin to compare different systems and look for trends.

Filed Under: RSS Kosmos

Comet’s firework display ahead of perihelion

11.08.2015 by Kaido Reivelt

In the approach to perihelion over the past few weeks, Rosetta has been witnessing growing activity from Comet 67P/Churyumov–Gerasimenko, with one dramatic outburst event proving so powerful that it even pushed away the incoming solar wind.

Filed Under: RSS Kosmos

Then and now

11.08.2015 by Kaido Reivelt

Space science image of the week: Rosetta’s view upon arrival at the comet, on 6 August 2014, and exactly one year later

Filed Under: RSS Kosmos

Optics laboratory extensions

11.08.2015 by Kaido Reivelt

Most of the optics experiments done in beginning or advanced labs have ultrasonic analogs which can
be used to demonstrate much of what can be done in the optics labs. These analogs can be used as a
substitute for the corresponding optics experiments…

Filed Under: RSS Füüsikaharidus

Finite size effect on classical ideal gas revisited

11.08.2015 by Kaido Reivelt

Finite size effects on classical ideal gas are revisited. The micro-canonical partition function for
a collection of ideal particles confined in a box is evaluated using Euler?Maclaurin?s as well as
Poisson’s summation formula. In Poisson’s summation…

Filed Under: RSS Füüsikaharidus

A note on the Fermi energy of an ideal Fermi gas trapped under a generic power law potential in d -dimension

11.08.2015 by Kaido Reivelt

The average energy per fermion in the case of a Fermi gas with any kinematic characteristic, trapped
under the most general power law potential in d -dimension has been calculated at zero temperature.
In a previous paper (Acharyya M 2010 Eur. J Phys….

Filed Under: RSS Füüsikaharidus

Laplace equation, magnetic recording and the Karlqvist approximation

11.08.2015 by Kaido Reivelt

Magnetic recording head theory is based on the Karlqvist approximation to solve the Laplace equation
over a polygonal domain that originates from a magnetostatic approach to describe the magnetic field
produced by the read/write head in the recording…

Filed Under: RSS Füüsikaharidus

Some problems in applications of the linear variational method

11.08.2015 by Kaido Reivelt

The linear variational method is a standard computational method in quantum mechanics and quantum
chemistry. As taught in most classes, the general guidance is to include as many basis functions as
practical in the variational wave function. However,…

Filed Under: RSS Füüsikaharidus

NASA’s Europa Mission Team Joins Forces for the First Time

10.08.2015 by Kaido Reivelt

Like legendary superheroes, all space missions have origin stories. NASA’s Europa mission team recently wrote the final chapter of theirs, with their first team meeting.

Filed Under: RSS Kosmos

One Decade after Launch, Mars Orbiter Still Going Strong

10.08.2015 by Kaido Reivelt

Ten years after launch, NASA’s Mars Reconnaissance Orbiter has revealed the Red Planet’s diversity and activity, and its work is far from over.

Filed Under: RSS Kosmos

Nature, Chinese Pollution Offset U.S. West Ozone Gains

10.08.2015 by Kaido Reivelt

An expected reduction in atmospheric ozone levels over the western U.S. was offset by natural atmospheric processes and pollutants crossing the Pacific Ocean from China.

Filed Under: RSS Kosmos

Experimental Observation of Quasicrystal Growth

10.08.2015 by Kaido Reivelt

Author(s): Keisuke Nagao, Tomoaki Inuzuka, Kazue Nishimoto, and Keiichi EdagawaIn situ high-resolution transmission electron microscopy has been used to spot quasicrystals in the act of growing.[Phys. Rev. Lett. 115, 075501] Published Mon Aug 10, 2015

Filed Under: RSS Teadus

Charting the slow death of the universe

10.08.2015 by Kaido Reivelt

Astronomers studying energy output in the nearby universe have confirmed that the energy produced today is only about half what it was 2 billion years ago.

Filed Under: RSS Kosmos

Salt flat indicates some of the last vestiges of surface water on Mars

10.08.2015 by Kaido Reivelt

Digital terrain mapping and mineralogical analysis of the features surrounding the deposit indicate that this one-time lakebed is no older than 3.6 billion years old.

Filed Under: RSS Kosmos

Gravitational constant appears universally constant, pulsar study suggests

8.08.2015 by Kaido Reivelt

The fact that scientists can see gravity perform the same in our solar system as it does in a distant star system helps confirm that the gravitational constant truly is universal.

Filed Under: RSS Kosmos

NASA to Share the Universe with Tumblr Users

7.08.2015 by Kaido Reivelt

NASA is launching an official Tumblr profile that will give Tumblr users a regular dose of space in a blog-like format through text, photos, videos and more.

Filed Under: RSS Kosmos

Week In Images

7.08.2015 by Kaido Reivelt

Our week through the lens: 3-7 August 2015

Filed Under: RSS Kosmos

Hubble finds evidence of galaxy star birth regulated by black hole fountain

7.08.2015 by Kaido Reivelt

The discovery explains the mystery of why many elliptical galaxies in the present-day universe are not ablaze with a higher rate of star birth.

Filed Under: RSS Kosmos

Celebrate perihelion!

7.08.2015 by Kaido Reivelt

Watch a replay of a Google+ Hangout with Rosetta and Philae experts held to celebrate the comet’s closest approach to the Sun

Filed Under: RSS Kosmos

Sentinels catch traffic jam

7.08.2015 by Kaido Reivelt

Low water levels in the Danube river have left ships to queue close to the town of Zimnicea in Romania.

Filed Under: RSS Kosmos

From a million miles away, NASA camera shows Moon crossing face of Earth

6.08.2015 by Kaido Reivelt

The DSCOVR satellite’s series of test images reveals the fully illuminated “dark side” of the Moon never visible from our planet.

Filed Under: RSS Kosmos

In Africa, More Smoke Leads to Less Rain, NASA Shows

6.08.2015 by Kaido Reivelt

Agricultural fires in North Africa reduce the region’s rainfall during the dry season, according to a NASA study.

Filed Under: RSS Kosmos

Cruise Over Ceres in New Video

6.08.2015 by Kaido Reivelt

Striking 3-D detail highlights a towering mountain, the brightest spots and other features on dwarf planet Ceres in a new video from NASA’s Dawn mission.

Filed Under: RSS Kosmos

Cruise over Ceres in new video

6.08.2015 by Kaido Reivelt

A prominent mountain with bright streaks on its steep slopes is especially fascinating to scientists.

Filed Under: RSS Kosmos

Year at a comet

6.08.2015 by Kaido Reivelt


Celebrating Rosetta’s first year at Comet 67P/Churyumov–Gerasimenko with a calendar of NavCam images

Filed Under: RSS Kosmos

Celebrating a year at the comet

6.08.2015 by Kaido Reivelt

ESA’s Rosetta mission today celebrates one year at Comet 67P/Churyumov–Gerasimenko, with its closest approach to the Sun now just one week away.

Filed Under: RSS Kosmos

Expanding the simple pendulum’s rotation solution in action-angle variables

6.08.2015 by Kaido Reivelt

Integration of Hamiltonian systems by reduction to action-angle variables has proven to be a
successful approach. However, when the solution depends on elliptic functions, the transformation to
action-angle variables may need to remain in implicit fo…

Filed Under: RSS Füüsikaharidus

Expanding the simple pendulum’s rotation solution in action-angle variables

6.08.2015 by Kaido Reivelt

Integration of Hamiltonian systems by reduction to action-angle variables has proven to be a
successful approach. However, when the solution depends on elliptic functions, the transformation to
action-angle variables may need to remain in implicit fo…

Filed Under: RSS Füüsikaharidus

Mechanical analog of an over-damped Josephson junction

6.08.2015 by Kaido Reivelt

An over-damped pendulum can be adopted as a mechanical analogue of an over-damped Josephson junction
(JJ). The basic equations leading to the driving torque versus the time average of the angular
frequency are studied. The mechanical analogue can be …

Filed Under: RSS Füüsikaharidus

Mechanical analog of an over-damped Josephson junction

6.08.2015 by Kaido Reivelt

An over-damped pendulum can be adopted as a mechanical analogue of an over-damped Josephson junction
(JJ). The basic equations leading to the driving torque versus the time average of the angular
frequency are studied. The mechanical analogue can be …

Filed Under: RSS Füüsikaharidus

Large deviations of the maximum of independent and identically distributed random variables

6.08.2015 by Kaido Reivelt

A pedagogical account of some aspects of extreme value statistics (EVS) is presented from the
somewhat non-standard viewpoint of large deviation theory. We address the following problem: given a
set of N independent and identically distributed (i.i.d…

Filed Under: RSS Füüsikaharidus

Large deviations of the maximum of independent and identically distributed random variables

6.08.2015 by Kaido Reivelt

A pedagogical account of some aspects of extreme value statistics (EVS) is presented from the
somewhat non-standard viewpoint of large deviation theory. We address the following problem: given a
set of N independent and identically distributed (i.i.d…

Filed Under: RSS Füüsikaharidus

Coherent scattering in non relativistic quantum mechanics

6.08.2015 by Kaido Reivelt

In this paper we give a pedagogical explanation of coherence effects in non relativistic scattering
processes. Coherent scattering is important not only because it is a clear manifestation of the wave
character of the interaction in these regimes, bu…

Filed Under: RSS Füüsikaharidus

Coherent scattering in non relativistic quantum mechanics

6.08.2015 by Kaido Reivelt

In this paper we give a pedagogical explanation of coherence effects in non relativistic scattering
processes. Coherent scattering is important not only because it is a clear manifestation of the wave
character of the interaction in these regimes, bu…

Filed Under: RSS Füüsikaharidus

Advanced undergraduate RC circuits: an experimentalist’s perspective

6.08.2015 by Kaido Reivelt

In this paper, an advanced undergraduate RC circuit is studied in two different ways. The circuit is
a typical series RC circuit with a time-varying voltage source. The temporal profile of the voltage
is an isolated, Gaussian shaped pulse. The voltag…

Filed Under: RSS Füüsikaharidus

Advanced undergraduate RC circuits: an experimentalist’s perspective

6.08.2015 by Kaido Reivelt

In this paper, an advanced undergraduate RC circuit is studied in two different ways. The circuit is
a typical series RC circuit with a time-varying voltage source. The temporal profile of the voltage
is an isolated, Gaussian shaped pulse. The voltag…

Filed Under: RSS Füüsikaharidus

New Online Exploring Tools Bring NASA Journey’s to Mars to New Generation

5.08.2015 by Kaido Reivelt

On the three-year anniversary of the Mars landing of NASA’s Curiosity rover, NASA is unveiling two new online tools, inviting the public to help with its journey to Mars.

Filed Under: RSS Kosmos

Researchers Use ‘Seafloor Gardens’ to Switch on Light Bulb

5.08.2015 by Kaido Reivelt

How did the very first life forms on Earth get an electrical boost? New laboratory experiments offer clues.

Filed Under: RSS Kosmos

Jupiter’s Great Red Spot: a swirling mystery

5.08.2015 by Kaido Reivelt

Scientists are performing laboratory studies to try to decipher what causes the giant storm’s swirl of reddish hues.

Filed Under: RSS Kosmos

Jupiter’s Great Red Spot: a swirling mystery

5.08.2015 by Kaido Reivelt

Scientists are performing laboratory studies to try to decipher what causes the giant storm’s swirl of reddish hues.

Filed Under: RSS Kosmos

Tracking a mysterious group of asteroid outcasts

5.08.2015 by Kaido Reivelt

A new study has traced some members of the near-Earth object population back to their likely source — the Euphrosyne family of dark asteroids in the outer asteroid belt.

Filed Under: RSS Kosmos

First MSG-4 image

4.08.2015 by Kaido Reivelt


Europe’s latest weather satellite images Earth today

Filed Under: RSS Kosmos

Ghostly remnants of galaxy interactions uncovered in nearby galaxy group

4.08.2015 by Kaido Reivelt

As part of a galactic archaeology study, astronomers discovered that the spatial distribution of the young stars around M81, M82, and NGC 3077 follows very closely that of their distribution of neutral hydrogen.

Filed Under: RSS Kosmos

Neutron stars strike back at black holes in jet contest

4.08.2015 by Kaido Reivelt

Astronomers have discovered that some neutron stars may rival black holes in their ability to accelerate powerful jets of material to nearly the speed of light.

Filed Under: RSS Kosmos

Tracking downunder

4.08.2015 by Kaido Reivelt


Human spaceflight and operations image of the week: ESA’s New Norcia deep-space tracking station illuminated against the Australian night sky

Filed Under: RSS Kosmos

Sackur?Tetrode equation in the lab

4.08.2015 by Kaido Reivelt

We present a review of some aspects related to the experimental validity of the Sackur?Tetrode
equation for the entropy of monatomic ideal gases. First, we examine the main theoretical
assumptions which underlie the statistical derivation of the equa…

Filed Under: RSS Füüsikaharidus

Impedance function calculation for the study of waves in locally periodic arrangements

4.08.2015 by Kaido Reivelt

In this paper, we study theoretically the propagation of waves in locally periodic systems. To this
end, we employ a simple method based on the impedance function which is similar to the one used in
the transmission line theory. Results are presented…

Filed Under: RSS Füüsikaharidus

Sackur–Tetrode equation in the lab

4.08.2015 by Kaido Reivelt

We present a review of some aspects related to the experimental validity of the Sackur–Tetrode
equation for the entropy of monatomic ideal gases. First, we examine the main theoretical
assumptions which underlie the statistical derivation of the eq…

Filed Under: RSS Füüsikaharidus

Sound resonance in pipes with discrete Fourier transform

4.08.2015 by Kaido Reivelt

Sound resonance in pipes is investigated using a readily available setup consisting of a pipe,
loudspeaker, microphone, and laptop. Discrete Fourier transform is used to extract the amplitude and
phase spectra from the recorded sound enabling determi…

Filed Under: RSS Füüsikaharidus

A simple way of approximating the canonical partition functions in statistical mechanics

4.08.2015 by Kaido Reivelt

We propose a simple pedagogical way of introducing the Euler–MacLaurin summation formula in an
undergraduate course on statistical mechanics. The reason is that the students may feel more
comfortable and confident if they are able to deduce the mai…

Filed Under: RSS Füüsikaharidus

No-faster-than-light-signaling implies linear evolution. A re-derivation

4.08.2015 by Kaido Reivelt

There is a growing interest, both from the theoretical as well as experimental side, to test the
validity of the quantum superposition principle, and of theories which explicitly violate it by
adding nonlinear terms to the Schrödinger equation. We r…

Filed Under: RSS Füüsikaharidus

Characterizing the movement of a falling rigid rod

4.08.2015 by Kaido Reivelt

In this paper we present a simple experimental set-up to study the fall of a rigid rod, which can
freely rotate around an articulated joint at the lowest point. The experimental set-up permits
preparation of a laboratory session for physics or engine…

Filed Under: RSS Füüsikaharidus

« Previous Page
Next Page »

Copyright © 2026 · Eesti Füüsika Selts · Log in