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On the electrostatic equilibrium of charges and cavities in a conductor

22.09.2016 by Kaido Reivelt

We consider a charged conductor of arbitrary shape, in electrostatic equilibrium, with one or more
cavities inside it, and with fixed charges placed outside the conductors and inside the cavities.
The field inside a particular cavity is then only due…

Filed Under: RSS Füüsikaharidus

The Helmholtz theorem and retarded fields

22.09.2016 by Kaido Reivelt

Textbooks frequently use the Helmholtz theorem to derive expressions for electrostatic and
magnetostatic fields but they do not usually apply this theorem to derive expressions for
time-dependent electric and magnetic fields, even when there is no fo…

Filed Under: RSS Füüsikaharidus

On the propagation of Voigt waves in energetically active materials

22.09.2016 by Kaido Reivelt

If Voigt-wave propagation is possible in a dissipative anisotropic dielectric material characterised
by the permittivity dyadic ##IMG##
[http://ej.iop.org/images/0143-0807/37/6/064002/ejpaa3bd4ieqn1.gif] {$\mathop{\varepsilon
}\limits_{\raise{2pt}=}…

Filed Under: RSS Füüsikaharidus

On the changes in optical interferometry induced by the relativistic motion of an optical medium

22.09.2016 by Kaido Reivelt

We investigate the effects of the relativistic movement of an optical medium on the conditions of
constructive and destructive interference, reflection and transmission pattern, and performance of
spectroscopes. First, we consider the case of two bea…

Filed Under: RSS Füüsikaharidus

Investigation of kinetic friction using an iPhone

22.09.2016 by Kaido Reivelt

The iPhone is particularly suitable for mechanics experiments using the in-built acceleration sensor
or accelerometer in-conjunction with the on-board data collection facility and a downloadable
so-called ‘app’. In this work the iPhone has been u…

Filed Under: RSS Füüsikaharidus

Software for teaching refraction of light with the semicircle

22.09.2016 by Kaido Reivelt

Software is presented for teaching elementary optics using a transparent semicircle. We demonstrate
the use of the semicircle to investigate Snell’s lawand students can are presented with the
difficulties involved in experiments. An Excel spreadshe…

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Using the Arduino with MakerPlot software for the display of resonance curves characterisic of a series LCR circuit

22.09.2016 by Kaido Reivelt

This paper shows how very simple circuitry attached to an Arduino microcontroller can be used for
the measurement of both frequency and amplitude of a sinusoidal signal. It is also shown how the
addition of a readily available software package, Maker…

Filed Under: RSS Füüsikaharidus

Magneto-Optical Signature of Massless Kane Electrons in Cd_{3} As_{2}

21.09.2016 by Kaido Reivelt

Author(s): A. Akrap, M. Hakl, S. Tchoumakov, I. Crassee, J. Kuba, M. O. Goerbig, C. C. Homes, O. Caha, J. Novák, F. Teppe, W. Desrat, S. Koohpayeh, L. Wu, N. P. Armitage, A. Nateprov, E. Arushanov, Q. D. Gibson, R. J. Cava, D. van der Marel, B. A. Piot, C. Faugeras, G. Martinez, M. Potemski, and M. Orlita

Optical reflectivity experiments on Cd3As2 indicate the presence of Kane electrons rather than Dirac fermions in this material. The results contradict those from recent ARPES experiments, but agree with recent STM results.


[Phys. Rev. Lett. 117, 136401] Published Wed Sep 21, 2016

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Stress Singularities in Swelling Soft Solids

21.09.2016 by Kaido Reivelt

Author(s): Alain Goriely, Johannes Weickenmeier, and Ellen KuhlA swelling brain bulging out of a circular opening in the skull exhibits a stress singularity (similar to that seen for punch indentation) at the point of contact with the skull.[Phys. Rev….

Filed Under: RSS Teadus

How Isotropic is the Universe?

21.09.2016 by Kaido Reivelt

Author(s): Daniela Saadeh, Stephen M. Feeney, Andrew Pontzen, Hiranya V. Peiris, and Jason D. McEwenA new study of the cosmic microwave background places the strictest limits to date on a rotating Universe and other forms of cosmic anisotropy.[Phys. Re…

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Stress Singularities in Swelling Soft Solids

21.09.2016 by Kaido Reivelt

Author(s): Alain Goriely, Johannes Weickenmeier, and Ellen KuhlA swelling brain bulging out of a circular opening in the skull exhibits a stress singularity (similar to that seen for punch indentation) at the point of contact with the skull.[Phys. Rev….

Filed Under: RSS Teadus

Magneto-Optical Signature of Massless Kane Electrons in Cd_{3} As_{2}

21.09.2016 by Kaido Reivelt

Author(s): A. Akrap, M. Hakl, S. Tchoumakov, I. Crassee, J. Kuba, M. O. Goerbig, C. C. Homes, O. Caha, J. Novák, F. Teppe, W. Desrat, S. Koohpayeh, L. Wu, N. P. Armitage, A. Nateprov, E. Arushanov, Q. D. Gibson, R. J. Cava, D. van der Marel, B. A. Piot, C. Faugeras, G. Martinez, M. Potemski, and M. Orlita

Optical reflectivity experiments on Cd3As2 indicate the presence of Kane electrons rather than Dirac fermions in this material. The results contradict those from recent ARPES experiments, but agree with recent STM results.


[Phys. Rev. Lett. 117, 136401] Published Wed Sep 21, 2016

Filed Under: RSS Teadus

How Isotropic is the Universe?

21.09.2016 by Kaido Reivelt

Author(s): Daniela Saadeh, Stephen M. Feeney, Andrew Pontzen, Hiranya V. Peiris, and Jason D. McEwenA new study of the cosmic microwave background places the strictest limits to date on a rotating Universe and other forms of cosmic anisotropy.[Phys. Re…

Filed Under: RSS Teadus

ESA releases striking new photos from Comet 67P

21.09.2016 by Kaido Reivelt

Rosetta’s camera captured images of the comet released earlier this week

Filed Under: RSS Kosmos

This is where space blobs come from

21.09.2016 by Kaido Reivelt

Astrophysicists describe the inner structure of a Lyman-Alpha blob

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JPL Seeks Robotic Spacecraft Development for Asteroid Redirect Mission

20.09.2016 by Kaido Reivelt

JPL issues a request for proposal for design, development and build of the robotic spacecraft to capture an asteroid boulder for the Asteroid Redirect Mission.

Filed Under: RSS Kosmos

NASA Scientists Find ‘Impossible’ Cloud on Titan — Again

20.09.2016 by Kaido Reivelt

The appearance of a mysterious ice cloud suggests that a different process than previously thought could be forming clouds on Saturn’s moon Titan.

Filed Under: RSS Kosmos

NASA Scientists Find ‘Impossible’ Cloud on Titan — Again

20.09.2016 by Kaido Reivelt

The appearance of a mysterious ice cloud suggests that a different process than previously thought could be forming clouds on Saturn’s moon Titan.

Filed Under: RSS Kosmos

JPL Seeks Robotic Spacecraft Development for Asteroid Redirect Mission

20.09.2016 by Kaido Reivelt

JPL issues a request for proposal for design, development and build of the robotic spacecraft to capture an asteroid boulder for the Asteroid Redirect Mission.

Filed Under: RSS Kosmos

Windmill of dust

20.09.2016 by Kaido Reivelt

Human spaceflight and robotic exploration image of the week: Recreating a martian dust storm

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Researchers now know why some minor planets have rings

20.09.2016 by Kaido Reivelt

Computer simulations reveal the factors that play into rings around the centaurs

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Aging and communication in the twin paradox

20.09.2016 by Kaido Reivelt

The twin paradox of the special theory of relativity has given rize to a large body of literature
discussing its implications. In its standard form, the traveler changes velocity only at the
destination of the trip, so that he appears to perceive an …

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Exploring the explaining quality of physics online explanatory videos

20.09.2016 by Kaido Reivelt

Explaining skills are among the most important skills educators possess. Those skills have also been
researched in recent years. During the same period, another medium has additionally emerged and
become a popular source of information for learners: …

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Corrigendum: Measuring nonlinear oscillations using a very accurate and low-cost linear optical position transducer (2016 Eur. J. Phys. 37 [http://dx.doi.org/10.1088/0143-0807/37/5/055301] 055301 )

20.09.2016 by Kaido Reivelt

Description unavailable

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Relativity, potential energy, and mass

20.09.2016 by Kaido Reivelt

This paper is an exploration of the concept of energy, illuminated by the transformative insights of
the special theory of relativity. Focusing on potential energy ( PE ), it will be shown that PE as
presently defined is in conflict with the tenets o…

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Classical dynamics of the relativistic oscillator

20.09.2016 by Kaido Reivelt

This paper aims at a comprehensive analysis of the dynamics of the classical relativistic
oscillator. Numerical integration of its dynamical equations permits a thorough treatment of its
motion. Both the one-dimensional and two-dimensional cases are …

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Zero-mass limit of a Dirac spinor with general spin orientation

20.09.2016 by Kaido Reivelt

The helicity eigenstates that describe fermions with a special spin orientation (parallel or
antiparallel to the direction of momentum) provide a considerable simplification in calculations.
Hence, it is generally preferred to use the helicity basis …

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Dynamics of students’ epistemological framing in group problem solving

20.09.2016 by Kaido Reivelt

Many studies have investigated students’ epistemological framing when solving physics problems.
Framing supports students’ problem solving as they decide what knowledge to employ and the necessary
steps to solve the problem. Students may frame th…

Filed Under: RSS Füüsikaharidus

The many facets of the Fabry–Perot

20.09.2016 by Kaido Reivelt

We address the response, both in amplitude and intensity, of a Fabry–Perot from a variety of
viewpoints. These complementary pictures conspire to achieve a comprehensive and consistent theory
of the operation of this system.

Filed Under: RSS Füüsikaharidus

Comment on ‘Yet another encounter with the golden ratio: balancing laminar bodies on the edge’

20.09.2016 by Kaido Reivelt

When a circle is excised from a bigger circle so that the center of mass of the remaining portion is
at a point in the inner edge, then the radii of the two circles are in the golden ratio. The same is
true for any even sided regular polygon for exci…

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Pedagogical systematic derivation of Noether point symmetries in special relativistic field theories and extended gravity cosmology

20.09.2016 by Kaido Reivelt

A didactic and systematic derivation of Noether point symmetries and conserved currents is put
forward in special relativistic field theories, without a priori assumptions about the
transformation laws. Given the Lagrangian density, the invariance co…

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Persistence of physics and engineering students via peer mentoring, active learning, and intentional advising

20.09.2016 by Kaido Reivelt

Albion College, a private, undergraduate-only, liberal arts college in Michigan, USA, has developed
and implemented a low-cost peer-mentoring programme that blends personal and academic support to
help students achieve academic success in the introdu…

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A simple derivation for amplitude and time period of charged particles in an electrostatic bathtub potential

20.09.2016 by Kaido Reivelt

An ‘electrostatic bathtub potential’ is defined and analytical expressions for the time period and
amplitude of charged particles in this potential are obtained and compared with simulations. These
kinds of potentials are encountered in linear el…

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Solving ordinary differential equations by electrical analogy: a multidisciplinary teaching tool

20.09.2016 by Kaido Reivelt

Ordinary differential equations are the mathematical formulation for a great variety of problems in
science and engineering, and frequently, two different problems are equivalent from a mathematical
point of view when they are formulated by the same …

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An issue encountered in solving problems in electricity and magnetism: curvilinear coordinates

20.09.2016 by Kaido Reivelt

In physics lectures on electromagnetic theory and mathematical methods, physics teacher candidates
have some difficulties with curvilinear coordinate systems. According to our experience, based on
both in-class interactions and teacher candidates’ …

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A Mixed-reality Trip to Mars

19.09.2016 by Kaido Reivelt

Mixed-reality technology designed by JPL and Microsoft “transports” the public to the Red Planet.

Filed Under: RSS Kosmos

A Mixed-reality Trip to Mars

19.09.2016 by Kaido Reivelt

Mixed-reality technology designed by JPL and Microsoft “transports” the public to the Red Planet.

Filed Under: RSS Kosmos

Nuclear Binding Near a Quantum Phase Transition

19.09.2016 by Kaido Reivelt

Author(s): Serdar Elhatisari, Ning Li, Alexander Rokash, Jose Manuel Alarcón, Dechuan Du, Nico Klein, Bing-nan Lu, Ulf-G. Meißner, Evgeny Epelbaum, Hermann Krebs, Timo A. Lähde, Dean Lee, and Gautam Rupak

Simulations predict that the ground states of certain light nuclei lie near a quantum phase transition between a liquid-like phase and a phase involving clusters of alpha particles.


[Phys. Rev. Lett. 117, 132501] Published Mon Sep 19, 2016

Filed Under: RSS Teadus

Continuous Quantum Nondemolition Measurement of the Transverse Component of a Qubit

19.09.2016 by Kaido Reivelt

Author(s): U. Vool, S. Shankar, S. O. Mundhada, N. Ofek, A. Narla, K. Sliwa, E. Zalys-Geller, Y. Liu, L. Frunzio, R. J. Schoelkopf, S. M. Girvin, and M. H. Devoret

The transverse component of a superconducting qubit is continuously measured for the first time, showing quantum jumps between its eigenstates.


[Phys. Rev. Lett. 117, 133601] Published Mon Sep 19, 2016

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Nuclear Binding Near a Quantum Phase Transition

19.09.2016 by Kaido Reivelt

Author(s): Serdar Elhatisari, Ning Li, Alexander Rokash, Jose Manuel Alarcón, Dechuan Du, Nico Klein, Bing-nan Lu, Ulf-G. Meißner, Evgeny Epelbaum, Hermann Krebs, Timo A. Lähde, Dean Lee, and Gautam Rupak

Simulations predict that the ground states of certain light nuclei lie near a quantum phase transition between a liquid-like phase and a phase involving clusters of alpha particles.


[Phys. Rev. Lett. 117, 132501] Published Mon Sep 19, 2016

Filed Under: RSS Teadus

Continuous Quantum Nondemolition Measurement of the Transverse Component of a Qubit

19.09.2016 by Kaido Reivelt

Author(s): U. Vool, S. Shankar, S. O. Mundhada, N. Ofek, A. Narla, K. Sliwa, E. Zalys-Geller, Y. Liu, L. Frunzio, R. J. Schoelkopf, S. M. Girvin, and M. H. Devoret

The transverse component of a superconducting qubit is continuously measured for the first time, showing quantum jumps between its eigenstates.


[Phys. Rev. Lett. 117, 133601] Published Mon Sep 19, 2016

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Titan’s flooded canyons

19.09.2016 by Kaido Reivelt


Space Science Image of the Week: With hydrocarbon seas and methane-flooded canyons, Titan’s landforms show striking similarities to their water-filled Earth counterparts

Filed Under: RSS Kosmos

Celestial navigation is returning to the Naval Academy cirriculum

19.09.2016 by Kaido Reivelt

Why celestial navigation is important in the age of GPS technology

Filed Under: RSS Kosmos

Mathematical Model Explains Pluto’s Frozen Heart

19.09.2016 by Kaido Reivelt

Glaciers flow in Pluto’s heart

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On-Chip Strong Coupling and Efficient Frequency Conversion between Telecom and Visible Optical Modes

16.09.2016 by Kaido Reivelt

Author(s): Xiang Guo, Chang-Ling Zou, Hojoong Jung, and Hong X. Tang

A new device that can potentially be scaled up for quantum computing converts visible light to infrared light suitable for fiber-optic transmission without destroying the light’s quantum state.


[Phys. Rev. Lett. 117, 123902] Published Fri Sep 16, 2016

Filed Under: RSS Teadus

High-Brightness High-Energy Electron Beams from a Laser Wakefield Accelerator via Energy Chirp Control

16.09.2016 by Kaido Reivelt

Author(s): W. T. Wang, W. T. Li, J. S. Liu, Z. J. Zhang, R. Qi, C. H. Yu, J. Q. Liu, M. Fang, Z. Y. Qin, C. Wang, Y. Xu, F. X. Wu, Y. X. Leng, R. X. Li, and Z. Z. Xu

Using a new two-stage acceleration scheme, where electron injection and seeding are controlled in different periods of the laser wakefield, high-quality tunable electron beams are produced with brightnesses close to those achieved in state-of-the-art linac drivers.


[Phys. Rev. Lett. 117, 124801] Published Fri Sep 16, 2016

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Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment

16.09.2016 by Kaido Reivelt

Author(s): Andi Tan et al. (PandaX-II Collaboration)The PandaX-II experiment reports results from their first full physics run in search of dark matter. They find none, and their data cut in half the existing upper limit on the scattering cross section…

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Dense Axion Stars

16.09.2016 by Kaido Reivelt

Author(s): Eric Braaten, Abhishek Mohapatra, and Hong ZhangAxions, if they make up the dark mater, could form dense stars balanced by gravity and the mean-field pressure of the axion Bose-Einstein condensate.[Phys. Rev. Lett. 117, 121801] Published Fri…

Filed Under: RSS Teadus

High-Brightness High-Energy Electron Beams from a Laser Wakefield Accelerator via Energy Chirp Control

16.09.2016 by Kaido Reivelt

Author(s): W. T. Wang, W. T. Li, J. S. Liu, Z. J. Zhang, R. Qi, C. H. Yu, J. Q. Liu, M. Fang, Z. Y. Qin, C. Wang, Y. Xu, F. X. Wu, Y. X. Leng, R. X. Li, and Z. Z. Xu

Using a new two-stage acceleration scheme, where electron injection and seeding are controlled in different periods of the laser wakefield, high-quality tunable electron beams are produced with brightnesses close to those achieved in state-of-the-art linac drivers.


[Phys. Rev. Lett. 117, 124801] Published Fri Sep 16, 2016

Filed Under: RSS Teadus

On-Chip Strong Coupling and Efficient Frequency Conversion between Telecom and Visible Optical Modes

16.09.2016 by Kaido Reivelt

Author(s): Xiang Guo, Chang-Ling Zou, Hojoong Jung, and Hong X. Tang

A new device that can potentially be scaled up for quantum computing converts visible light to infrared light suitable for fiber-optic transmission without destroying the light’s quantum state.


[Phys. Rev. Lett. 117, 123902] Published Fri Sep 16, 2016

Filed Under: RSS Teadus

Dense Axion Stars

16.09.2016 by Kaido Reivelt

Author(s): Eric Braaten, Abhishek Mohapatra, and Hong ZhangAxions, if they make up the dark mater, could form dense stars balanced by gravity and the mean-field pressure of the axion Bose-Einstein condensate.[Phys. Rev. Lett. 117, 121801] Published Fri…

Filed Under: RSS Teadus

Week In Images

16.09.2016 by Kaido Reivelt

Our week through the lens: 12-16 September 2016

Filed Under: RSS Kosmos

Proxima

16.09.2016 by Kaido Reivelt

ESA’s next astronaut mission will be launched in November

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Space for inspiration

16.09.2016 by Kaido Reivelt

Replays of the two-day event exploring the benefits of human spaceflight for our world

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App Camp wrap-up

16.09.2016 by Kaido Reivelt


Follow the presentation of projects from this year’s Space App Camp via live webstream at 08:30–12:30 CEST on 19 September, with a special presentation from astronaut Luca Parmitano

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Bringing schools and communities online in Africa

16.09.2016 by Kaido Reivelt

ESA is now working with satellite operator Avanti Communications to bring a swathe of new affordable Internet services to more people across sub-Saharan Africa through the Hylas-4 telecom satellite, due for launch next year.

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Hang out with Rosetta

16.09.2016 by Kaido Reivelt


Watch an ESA Hangout on 19 September at 12:00 GMT / 14:00 CEST with mission experts ahead of Rosetta’s grand #CometLanding finale

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Poyang Lake

16.09.2016 by Kaido Reivelt

Earth observation image of the week: China’s Poyang Lake in radar vision

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Studying meteorites

16.09.2016 by Kaido Reivelt


Human spaceflight and robotic exploration image of the week: astronauts and instructors holding meteorites at ESA’s planetary geology course Pangaea

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Vega releases five satellites in complex mission

16.09.2016 by Kaido Reivelt

Arianespace launched a Vega rocket on a complex mission early this morning that demonstrated the flexibility of its upper stage and multisatellite carrier.

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Cassini Begins Epic Final Year at Saturn

15.09.2016 by Kaido Reivelt

After more than 12 years studying Saturn, its rings and moons, NASA’s Cassini spacecraft has entered the final year of its epic voyage.

Filed Under: RSS Kosmos

Studies Find Echoes of Black Holes Eating Stars

15.09.2016 by Kaido Reivelt

Supermassive black holes, with their immense gravitational pull, are notoriously good at clearing out their immediate surroundings by eating nearby objects.

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Some Ancient Mars Lakes Came Long After Others

15.09.2016 by Kaido Reivelt

Lakes and snowmelt-fed streams on Mars formed much later than previously thought possible, according to new findings using data primarily from a NASA orbiter.

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Cassini Begins Epic Final Year at Saturn

15.09.2016 by Kaido Reivelt

After more than 12 years studying Saturn, its rings and moons, NASA’s Cassini spacecraft has entered the final year of its epic voyage.

Filed Under: RSS Kosmos

Studies Find Echoes of Black Holes Eating Stars

15.09.2016 by Kaido Reivelt

Supermassive black holes, with their immense gravitational pull, are notoriously good at clearing out their immediate surroundings by eating nearby objects.

Filed Under: RSS Kosmos

Torsional Optomechanics of a Levitated Nonspherical Nanoparticle

15.09.2016 by Kaido Reivelt

Author(s): Thai M. Hoang, Yue Ma, Jonghoon Ahn, Jaehoon Bang, F. Robicheaux, Zhang-Qi Yin, and Tongcang LiResearchers characterize the rotational jiggling of an optically levitated nanoparticle, showing how this motion could be cooled to its quantum gr…

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Torsional Optomechanics of a Levitated Nonspherical Nanoparticle

15.09.2016 by Kaido Reivelt

Author(s): Thai M. Hoang, Yue Ma, Jonghoon Ahn, Jaehoon Bang, F. Robicheaux, Zhang-Qi Yin, and Tongcang LiResearchers characterize the rotational jiggling of an optically levitated nanoparticle, showing how this motion could be cooled to its quantum gr…

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Earth from Space

15.09.2016 by Kaido Reivelt


Join us Friday, 16 September, at 10:00 CEST for the ‘Earth from Space’ video programme. This week features Poyang Lake in China – home to the finless porpoise

Filed Under: RSS Kosmos

Kitchen control

15.09.2016 by Kaido Reivelt

Operations image of the week: Checking on satellite health at the weekend and after-hours from the kitchen

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Cosmic microwaves show reionization happened later than thought

15.09.2016 by Kaido Reivelt

Later reionization fingers first stars as the culprit

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Cool scene for MetOp-C

15.09.2016 by Kaido Reivelt

Technology image of the week: A complex cryogenic structure set up in advance of testing Europe’s next weather satellite

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A taster of Gaia’s sky

15.09.2016 by Kaido Reivelt


Media briefing replay: Gaia scientists present stellar catalogues obtained during the first year of ESA’s star surveyor

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Work?energy theorem and friction forces: two experiments

15.09.2016 by Kaido Reivelt

Several studies have showed the subsistence, even in students enrolled in scientific degree courses,
of spontaneous ideas regarding the motion of bodies that conflict with Newton?s laws. One of the
causes is related to the intuitive preconceptions th…

Filed Under: RSS Füüsikaharidus

Two different looks at Kepler?s refraction experiment

15.09.2016 by Kaido Reivelt

Most refraction experiments are theory-laden and far from everyday experience. Accordingly, many
students fail to apply the law of refraction to phenomena. To guide students from phenomena to
theory, teachers can use a refraction experiment proposed …

Filed Under: RSS Füüsikaharidus

Work–energy theorem and friction forces: two experiments

15.09.2016 by Kaido Reivelt

Several studies have showed the subsistence, even in students enrolled in scientific degree courses,
of spontaneous ideas regarding the motion of bodies that conflict with Newton’s laws. One of the
causes is related to the intuitive preconceptions …

Filed Under: RSS Füüsikaharidus

Two different looks at Kepler’s refraction experiment

15.09.2016 by Kaido Reivelt

Most refraction experiments are theory-laden and far from everyday experience. Accordingly, many
students fail to apply the law of refraction to phenomena. To guide students from phenomena to
theory, teachers can use a refraction experiment proposed …

Filed Under: RSS Füüsikaharidus

DIY soundcard based temperature logging system. Part II: applications

15.09.2016 by Kaido Reivelt

This paper demonstrates some simple applications of how temperature logging systems may be used to
monitor simple heat experiments, and how the data obtained can be analysed to get some additional
insight into the physical processes.

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DIY soundcard based temperature logging system. Part I: design

15.09.2016 by Kaido Reivelt

This paper aims to enable schools to make their own low-cost temperature logging instrument and to
learn a something about its calibration in the process. This paper describes how a thermistor can be
integrated into a simple potential divider circuit…

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Fighting Cancer with Space Research

14.09.2016 by Kaido Reivelt

JPL and the National Cancer Institute renewed a partnership to extend development of data science that originated in space exploration and now supports cancer discoveries.

Filed Under: RSS Kosmos

Fighting Cancer with Space Research

14.09.2016 by Kaido Reivelt

JPL and the National Cancer Institute renewed a partnership to extend development of data science that originated in space exploration and now supports cancer discoveries.

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Revisit Open Science

14.09.2016 by Kaido Reivelt


Watch the replay videos of the EO Open Science 2016 conference held at ESA’s ESRIN establishment in Italy 12–14 September

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Observation of the Quantum Anomalous Hall Insulator to Anderson Insulator Quantum Phase Transition and its Scaling Behavior

14.09.2016 by Kaido Reivelt

Author(s): Cui-Zu Chang, Weiwei Zhao, Jian Li, J. K. Jain, Chaoxing Liu, Jagadeesh S. Moodera, and Moses H. W. Chan

A quantum phase transition between two insulating phases of a magnetic topological insulator is observed experimentally by tuning the material’s chemical potential.


[Phys. Rev. Lett. 117, 126802] Published Wed Sep 14, 2016

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Detectability of Light Dark Matter with Superfluid Helium

14.09.2016 by Kaido Reivelt

Author(s): Katelin Schutz and Kathryn M. ZurekSuperconducting aluminum or superfluid helium could be used to detect superlight dark matter particles.[Phys. Rev. Lett. 117, 121302] Published Wed Sep 14, 2016

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Observation of the Quantum Anomalous Hall Insulator to Anderson Insulator Quantum Phase Transition and its Scaling Behavior

14.09.2016 by Kaido Reivelt

Author(s): Cui-Zu Chang, Weiwei Zhao, Jian Li, J. K. Jain, Chaoxing Liu, Jagadeesh S. Moodera, and Moses H. W. Chan

A quantum phase transition between two insulating phases of a magnetic topological insulator is observed experimentally by tuning the material’s chemical potential.


[Phys. Rev. Lett. 117, 126802] Published Wed Sep 14, 2016

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Detectability of Light Dark Matter with Superfluid Helium

14.09.2016 by Kaido Reivelt

Author(s): Katelin Schutz and Kathryn M. ZurekSuperconducting aluminum or superfluid helium could be used to detect superlight dark matter particles.[Phys. Rev. Lett. 117, 121302] Published Wed Sep 14, 2016

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Gaia’s billion-star map hints at treasures to come

14.09.2016 by Kaido Reivelt

The first catalogue of more than a billion stars from ESA’s Gaia satellite was published today – the largest all-sky survey of celestial objects to date.

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‘It’s Just Too Perfect’: Inside the First Gravitiational Wave Detection

14.09.2016 by Kaido Reivelt

A year ago today, a select group of scientists became the first people on the planet to learn that, after a century of theory and experiments, Albert Einstein was right all along.

Researchers at the Laser Interferometer Gravitational-Wave Observatory …

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Can the moon make an earthquake worse?

14.09.2016 by Kaido Reivelt

When an earthquake occurs, it represents the release of years, sometimes decades or centuries, of pent-up stress. Somewhere along the fault line, a section of rock can take the strain no longer and gives way, allowing a tectonic plate to jerk into moti…

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Charon is flecked with a smudgy layer of Pluto’s atmosphere

14.09.2016 by Kaido Reivelt

As Pluto’s atmosphere becomes an aerosol called tholin, Charon is there to catch a good brunt of the planetary “sneeze.”

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Low cost Michelson?Morley interferometer

14.09.2016 by Kaido Reivelt

The Michelson?Morley interferometer is an important and challenging experiment in many undergraduate
as well as post-graduate physics laboratories. The apparatus required for this experiment is costly
and delicate to handle. It also requires consider…

Filed Under: RSS Füüsikaharidus

Deriving the time-independent Schr?dinger equation

14.09.2016 by Kaido Reivelt

A discussion of the physical meaning of the Schr?dinger wave equation can not only constitute an
exciting introduction to some of the more abstract ideas of quantum mechanics, but serves more
generally as a useful demonstration of the application of …

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Experiments with a differential transformer

14.09.2016 by Kaido Reivelt

An experiment with an electric transformer based on single coils shows how electromagnetic induction
changes when the magnetic coupling between coils is adjusted. This transformer has two secondary
outputs which are taken differentially. This is the …

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Problems based on phenomena and experiments in secondary school involving a digital camera

14.09.2016 by Kaido Reivelt

It is well known that secondary school pupils have lost their interest toward the subject physics.
This goes especially for problem solving, though understanding nature by physics requires the use of
mathematics and solving problems. The negative opi…

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Low cost Michelson–Morley interferometer

14.09.2016 by Kaido Reivelt

The Michelson–Morley interferometer is an important and challenging experiment in many undergraduate
as well as post-graduate physics laboratories. The apparatus required for this experiment is costly
and delicate to handle. It also requires consid…

Filed Under: RSS Füüsikaharidus

Deriving the time-independent Schrödinger equation

14.09.2016 by Kaido Reivelt

A discussion of the physical meaning of the Schrödinger wave equation can not only constitute an
exciting introduction to some of the more abstract ideas of quantum mechanics, but serves more
generally as a useful demonstration of the application of…

Filed Under: RSS Füüsikaharidus

NASA Begins Study of Australia’s Great Barrier Reef

13.09.2016 by Kaido Reivelt

A NASA airborne mission designed to transform our understanding of Earth’s ecologically sensitive coral reefs has arrived in Australia to investigate the Great Barrier Reef.

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NASA Begins Study of Australia’s Great Barrier Reef

13.09.2016 by Kaido Reivelt

A NASA airborne mission designed to transform our understanding of Earth’s ecologically sensitive coral reefs has arrived in Australia to investigate the Great Barrier Reef.

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Anomalous Dynamical Behavior of Freestanding Graphene Membranes

13.09.2016 by Kaido Reivelt

Author(s): M. L. Ackerman, P. Kumar, M. Neek-Amal, P. M. Thibado, F. M. Peeters, and Surendra Singh

The random quivering of graphene membranes could be exploited to generate electricity.


[Phys. Rev. Lett. 117, 126801] Published Tue Sep 13, 2016

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Giant Rashba Splitting in CH_{3} NH_{3} PbBr_{3} Organic-Inorganic Perovskite

13.09.2016 by Kaido Reivelt

Author(s): Daniel Niesner, Max Wilhelm, Ievgen Levchuk, Andres Osvet, Shreetu Shrestha, Miroslaw Batentschuk, Christoph Brabec, and Thomas FausterThe alignment of spins in an organic-inorganic perovskite semiconductor is directly observed via photoemis…

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Anomalous Dynamical Behavior of Freestanding Graphene Membranes

13.09.2016 by Kaido Reivelt

Author(s): M. L. Ackerman, P. Kumar, M. Neek-Amal, P. M. Thibado, F. M. Peeters, and Surendra Singh

The random quivering of graphene membranes could be exploited to generate electricity.


[Phys. Rev. Lett. 117, 126801] Published Tue Sep 13, 2016

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