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A zero cost experiment on the ‘impulse-momentum theorem’

7.12.2016 by Kaido Reivelt

Impulse-momentum theorem is a basic matter of the mechanics. A zero cost experiment can be used in
the classroom, without any apparatus, in order to verify the fundamental relationship between an
impulsive force and the linear momentum variation. Usi…

Filed Under: RSS Füüsikaharidus

Using smartphone pressure sensors to measure vertical velocities of elevators, stairways, and drones

7.12.2016 by Kaido Reivelt

We measure the vertical velocities of elevators, pedestrians climbing stairs, and drones (flying
unmanned aerial vehicles), by means of smartphone pressure sensors. The barometric pressure obtained
with the smartphone is related to the altitude of th…

Filed Under: RSS Füüsikaharidus

A teaching module about stellar structure and evolution

7.12.2016 by Kaido Reivelt

In this paper, we present a teaching module about stellar structure, functioning and evolution.
Drawing from literature in astronomy education, we designed the activities around three key ideas:
spectral analysis, mechanical and thermal equilibrium, …

Filed Under: RSS Füüsikaharidus

Approaching the brachistochrone using inclined planes—striving for shortest or equal travelling times

7.12.2016 by Kaido Reivelt

The classical brachistochrone problem asks for the path on which a mobile point M just driven by its
own gravity will travel in the shortest possible time between two given points A and B . The
resulting curve, the cycloid, will also be the tautochro…

Filed Under: RSS Füüsikaharidus

Simulating satellite and space probe motion at high school with spreadsheets

7.12.2016 by Kaido Reivelt

This paper gives an account of an experiment in which thirty-three high school students of ages
17–19 developed spreadsheet numerical models of satellite and space probe motion. The models are
free to download. A survey was carried out to find out …

Filed Under: RSS Füüsikaharidus

Utilisation of the magnetic sensor in a smartphone for facile magnetostatics experiment: magnetic field due to electrical current in straight and loop wires

7.12.2016 by Kaido Reivelt

This paper reports on the result of a research into the utilisation of a smartphone for the study of
magnetostatics on the basis of experiments. The use of such a device gives great measurement result
and thus it can replace magnetic sensor tools tha…

Filed Under: RSS Füüsikaharidus

Locating gravitational potential energy

7.12.2016 by Kaido Reivelt

Where does gravitational potential energy reside when a ball is in the air? The perfectly correct
answer is that it is located in the ball-Earth system. Still, mechanical energy conservation
problems are routinely solved by assigning a potential ener…

Filed Under: RSS Füüsikaharidus

Interactive physics apparatus: influence on interest of secondary school students in pursuing a career path in science, technology, engineering and mathematics (STEM)

7.12.2016 by Kaido Reivelt

In this article, we present results of our endeavours as physics educators to facilitate and support
pedagogical change and development in the educational system of a developing country, the
Philippines. We have discovered that the interaction of jun…

Filed Under: RSS Füüsikaharidus

The photoluminescence of a fluorescent lamp: didactic experiments on the exponential decay

7.12.2016 by Kaido Reivelt

The lifetimes of the photoluminescent compounds contained in the coating of fluorescent compact
lamps are usually measured using specialised instruments, including pulsed lasers and/or
spectrofluorometers. Here we discuss how some low cost apparatuse…

Filed Under: RSS Füüsikaharidus

Learning about A level physics students’ understandings of particle physics using concept mapping

7.12.2016 by Kaido Reivelt

This paper describes a small-scale piece of research using concept mapping to elicit A level
students’ understandings of particle physics. Fifty-nine year 12 (16- and 17 year-old) students from
two London schools participated. The exercise took pla…

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How to delude your senses

7.12.2016 by Kaido Reivelt

There are many video recordings of experiments available on the web that look like magic tricks.
These experiments can be very attractive for pupils. However, their explanation can be missing,
wrong or may lead to misconceptions. One of these is a vi…

Filed Under: RSS Füüsikaharidus

Ramp it up and down

7.12.2016 by Kaido Reivelt

We describe a simple experiment about sliding friction of an object moving with non-constant speed
along an inclined plane. This experiment can be used to study the entire dynamical process of force
and motion in various ways, depending on the mathem…

Filed Under: RSS Füüsikaharidus

Cassini Beams Back First Images from New Orbit

6.12.2016 by Kaido Reivelt

NASA’s Cassini spacecraft has sent to Earth its first views of Saturn’s atmosphere since beginning the latest phase of its mission.

Filed Under: RSS Kosmos

Cassini Beams Back First Images from New Orbit

6.12.2016 by Kaido Reivelt

NASA’s Cassini spacecraft has sent to Earth its first views of Saturn’s atmosphere since beginning the latest phase of its mission.

Filed Under: RSS Kosmos

Cassini Beams Back First Images from New Orbit

6.12.2016 by Kaido Reivelt

NASA’s Cassini spacecraft has sent to Earth its first views of Saturn’s atmosphere since beginning the latest phase of its mission.

Filed Under: RSS Kosmos

Tele-proximity: Tele-community of Inquiry Model. Facial Cues for Social, Cognitive, and Teacher Presence in Distance Education

6.12.2016 by Kaido Reivelt

Distance education is expanding in all continents, and the use of video has dominated internet. Synchronous Video Communication (SVC) has not been an option thoroughly investigated and practitioners, who use and design synchronous learning scenarios, are in urgent need of guidance. Distant learners face many barriers, and as a result, they drop out more frequently than on-campus students. Educators seem to be equally affected by the “transactional distance” and the new digital literacies needed for facilitating online learning. This study explores the educators’ perspective on how SVC could offer alternative educational forms and possibilities for distance learning. Findings had indicated that the use of visual communication and human to human contact (prosopogonosia: seeing faces) could have a strong impact on learning and teaching, therefore, a theory called Tele-proximity was formulated. Tele-proximity is defined as online embodiment that explains how instructors and students are connected in synchronous networked environment via tele-operations. SVC creates a sense of place or a stage where online identities perform and highlights recent research on audio-visual signals in communication and team work (Pentland, 2012, 2008).  The theory can be seen as an extension of the Community of Inquiry Model (Garrison, Anderson & Archer, 2000) and a theoretical framework according to which learning objectives could be designed. Transactional distance could be minimized and may be implemented to facilitate more synchronous, visual, and humane options in distance education.

Filed Under: RSS Füüsikaharidus

Ethical Considerations in the Practical Application of the Unisa Socio-Critical Model of Student Success

6.12.2016 by Kaido Reivelt

The prediction and classification of student performance has always been a central concern within higher education institutions. It is therefore natural for higher education institutions to harvest and analyse student data to inform decisions on educat…

Filed Under: RSS Füüsikaharidus

Reading Online in Foreign Languages: A Study of Strategy Use

6.12.2016 by Kaido Reivelt

Scores of studies have established that when learning online, students must be equipped with different sets of strategies and skills than in a physical classroom setting (Anderson, 2003; Broadbent & Poon, 2015; Coiro, 2007; Leu et al., 2007; Michinov, Brunot, Le Bohec, Juhel, & Delaval, 2011; Salmon, 2013).  The present study, by virtue of exploring foreign language learners’ online reading experience, aimed to identify the reading strategies that learners would use when engaged in online reading activities in the target foreign languages.  Thirty-two foreign language learners whose native language was English participated in the study.  The Online Survey of Reading Strategies (OSORS) designed by Anderson (2003) was administered to investigate the following four research questions: (1) What are the strategies that language learners would or would not use when reading online in foreign languages? (2) Would foreign language learners use some of the online reading strategies more frequently than other strategies? (3) Would different levels of foreign language proficiencies influence language learners’ use of the strategies?  (4) What could foreign language teachers do in their instruction to help students acquire and broaden their repertoire of online reading strategies?  Data analysis demonstrated the most and least frequently used strategies of the foreign language learners and uncovered a significant difference in the frequency of use among the strategies.  However, there was no significant difference found between the use of online reading strategies and learners’ foreign language proficiencies.  Implications and suggestions for future research and practice were proposed accordingly.      

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Challenges of Offering a MOOC from an LMIC

6.12.2016 by Kaido Reivelt

Massive open online courses (MOOCs) were initiated in the early 2000s by certain leading American and European universities. An integral part of the MOOC philosophy has been to provide open access to online learning. Despite their potential advantages …

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Assuring Quality in E-Learning Course Design: The Roadmap

6.12.2016 by Kaido Reivelt

Quality Assurance (QA) concepts and applications in Higher Education (HE) emerge from evolving meanings related to HE’s dynamic relationship with social, economic, cultural, and technological developments.  The latter has been redefined by the growth spurred by the forms distance and online education acquired during the last decades.  Creating a roadmap with clearly articulated meanings of quality and consistent key actions fills a need for the involved communities to reground the research, policy-making, and the related discourse.  Our current work consists of a thorough meta-analysis on all available research in every identified pertinent field. It is a qualitative review of the concepts, definitions, and approaches about quality in general, but also specifically, in e-learning in HE, as they have globally appeared in peer-reviewed journals, government reports, and web pages.  As we left no stone unturned in enquiring regarding the meanings, uses, evolution, and applicability of the revealed variables it is our hope that the roadmap we provide here will guide future research and support policy-making in the field. The present study is part of the research project e-learning Quality Assurance Design Standards in Higher Education (e-QADeSHE), which was funded by Laureate International Universities as the winning research project for the International David Wilson Award for Excellence in Teaching and Learning (2015 edition).

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The Effects of Online Interactions on the Relationship Between Learning-Related Anxiety and Intention to Persist Among E-Learning Students with Visual Impairment

6.12.2016 by Kaido Reivelt

This study explored whether learning-related anxiety would negatively affect intention to persist with e-learning among students with visual impairment, and examined the roles of three online interactions in the relationship between learning-related an…

Filed Under: RSS Füüsikaharidus

Evaluation of Virtual Objects: Contributions for the Learning Process

6.12.2016 by Kaido Reivelt

The constant technological development in education, and the potentiality of the resources offered by Information and Communication Technologies (ICTs), are challenges faced by teaching institutions in Brazil, especially by those institutions, which by…

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Coordinated Implicitly? An Empirical Study on the Role of Social Media in Collaborative Learning

6.12.2016 by Kaido Reivelt

As social media is widely adopted in collaborative learning, which places teams in a virtual environment, it is critical for teams to identify and leverage the knowledge of their members. Yet little is known about how social media influences teams to coordinate their knowledge and collaborate effectively. In this research, we explore the roles of two kinds of social media activity – information processing and social connection in teamwork – by applying communication and transactive memory systems (TMSs) as the mechanisms of explicit and implicit coordination respectively. We test this model using partial least squares (PLS) method by treating team as the unit of analysis. Drawing on the data from a study that involves 40 teams of graduate students performing a complex research report over eight weeks, we find that both TMSs and communication can significantly improve teamwork outcomes, and communication can help teams to better coordinate implicitly. With regard to social media activities, the results reveal that both information processing and social connection can enhance the level of TMSs; however, only social connection is positively related to communication. Unfortunately, information processing cannot significantly strengthen communication quality. The possible reasons are discussed and some theoretical and practical implications are also put forward.

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Open Assessment of Learning: A Meta-Synthesis

6.12.2016 by Kaido Reivelt

Open Assessment of Learning (OAoL) is an emerging educational concept derived from the incorporation of Information and Communication Technologies (ICT) to education and is related with the Open Education Movement. In order to improve understanding of …

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Faculty Members’ Instructional Priorities for Adopting OER

6.12.2016 by Kaido Reivelt

This study aimed to investigate and classify faculty members’ instructional priorities for adopting OER. In-depth interview data were collected from 10 faculty members from different regions and analyzed with NVivo 10. The original supposition was that the well-established instructional priorities, effectiveness, efficiency, and appeal would apply. However, it was found that in adopting OER, these faculty members had four instructional priorities: effectiveness, efficiency, appeal, and extension. Effectiveness was the most important consideration, followed by extension, appeal, and efficiency. Regional differences were also apparent. These findings were drawn upon to propose an elaborated model of instructional priorities for adopting OER.

Filed Under: RSS Füüsikaharidus

The Impact of Contact Sessions and Discussion Forums on the Academic Performance of Open Distance Learning Students

6.12.2016 by Kaido Reivelt

This study investigated the impact of face-to-face contact sessions and online discussion forums on the academic performance of students at an Open Distance Learning (ODL) university (N = 1,015). t-Tests for independent samples indicated that students …

Filed Under: RSS Füüsikaharidus

Online Instructors’ Use of Scaffolding Strategies to Promote Interactions: A Scale Development Study

6.12.2016 by Kaido Reivelt

A great deal of research has documented that interactions among students or between students and instructors are key to student success in an online learning setting. However, very little research has been statistically and systematically conducted to examine online instructors’ conscious and effortful use of scaffolding strategies to promote interactions in online courses. The purpose of this research was to develop a scale assessing online instructors’ use of scaffolding strategies to promote interactions. We employed a scale development method for the study. Exploratory factor analysis revealed one factor structure associated with instructors’ use of scaffolding strategies to promote interactions in online settings. Confirmatory factor analysis conducted with a different group of online students indicated that the one-factor model fits the data well. In addition, significant correlations with social presence and classroom learning community scales further demonstrated convergent validity. The new scale of online instructors’ use of scaffolding strategies to promote interactions demonstrated psychometrically sound validity and reliability.

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In Search for the Open Educator: Proposal of a Definition and a Framework to Increase Openness Adoption Among University Educators

6.12.2016 by Kaido Reivelt

The paper explores the change process that university teachers need to go through in order to become fluent with Open Education approaches. Based on a literature review and a set of interviews with a number of leading experts in the field of Open Educational Resources and Open Education, the paper puts forward an original definition of Open Educator which takes into account all the components of teachers’ work: learning design, teaching resources, pedagogical approaches and assessment methods- of teachers’ activities. Subsequently, to help the development of teachers’ openness capacity, the definition is further developed into a holistic framework for teachers, which takes into account all the dimensions of openness included in the definition and which provides teachers with self-development paths along each dimension. By working on the definition and on the framework with the interviewed experts, the paper concludes that a strong relation exists between the use of open approaches and the networking and collaboration attitude of university teachers, and that in order to overcome the technical and cultural barriers that hinder the use of open approaches in Higher Education, it is important to work on the transition phases – in terms of awareness and of capacity building – that teachers have to go through in their journey towards openness.

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Maintaining Momentum Toward Graduation: OER and the Course Throughput Rate

6.12.2016 by Kaido Reivelt

Open Educational Resources (OER) have the potential to replace traditional textbooks in higher education.  Previous studies indicate that use of OER results in high student and faculty satisfaction, lower costs, and similar or better educational outcomes. In this case study, we compared students using traditional textbooks with those using OER at Tidewater Community College to compare their performance on what we call course throughput rates, which is an aggregate of three variables – drop rates, withdrawal rates, and C or better rates. Two self-selecting cohorts were compared over four semesters, with statistically significant results. The study found that, subject to the limitations discussed, students who use OER perform significantly better on the course throughput rate than their peers who use traditional textbooks, in both face-to-face and online courses that use OER. This suggests that OER are a promising avenue for reducing the costs of higher education while increasing academic success.

Filed Under: RSS Füüsikaharidus

Editorial – Volume 17, Issue 6

6.12.2016 by Kaido Reivelt

Filed Under: RSS Füüsikaharidus

Geometric Resonance of Composite Fermions near Bilayer Quantum Hall States

6.12.2016 by Kaido Reivelt

Author(s): M. A. Mueed, D. Kamburov, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan

A single-layer to bilayer transition is induced in a two-dimensional electron gas by applying a parallel magnetic field, enabling the direct study of composite fermions.


[Phys. Rev. Lett. 117, 246801] Published Tue Dec 06, 2016

Filed Under: RSS Teadus

Large-Scale Patterns in a Minimal Cognitive Flocking Model: Incidental Leaders, Nematic Patterns, and Aggregates

6.12.2016 by Kaido Reivelt

Author(s): Lucas Barberis and Fernando Peruani<br/>We study a minimal cognitive flocking model, which assumes that the moving entities navigate using the available instantaneous visual information exclusively. The model consists of active particles, with no memory, that interact by a short-ranged, position-based, attractive force, which acts inside …<br/>[Phys. Rev. Lett. 117, 248001] Published Tue Dec 06, 2016

Filed Under: RSS Teadus

Large-Scale Patterns in a Minimal Cognitive Flocking Model: Incidental Leaders, Nematic Patterns, and Aggregates

6.12.2016 by Kaido Reivelt

Author(s): Lucas Barberis and Fernando Peruani<br/>We study a minimal cognitive flocking model, which assumes that the moving entities navigate using the available instantaneous visual information exclusively. The model consists of active particles, with no memory, that interact by a short-ranged, position-based, attractive force, which acts inside …<br/>[Phys. Rev. Lett. 117, 248001] Published Tue Dec 06, 2016

Filed Under: RSS Teadus

Geometric Resonance of Composite Fermions near Bilayer Quantum Hall States

6.12.2016 by Kaido Reivelt

Author(s): M. A. Mueed, D. Kamburov, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan

A single-layer to bilayer transition is induced in a two-dimensional electron gas by applying a parallel magnetic field, enabling the direct study of composite fermions.


[Phys. Rev. Lett. 117, 246801] Published Tue Dec 06, 2016

Filed Under: RSS Teadus

ExoMars orbiter images Phobos

6.12.2016 by Kaido Reivelt

The ExoMars Trace Gas Orbiter has imaged the martian moon Phobos as part of a second set of test science measurements made since it arrived at the Red Planet on 19 October.

Filed Under: RSS Kosmos

ExoMars orbiter images Phobos

6.12.2016 by Kaido Reivelt

The ExoMars Trace Gas Orbiter has imaged the martian moon Phobos as part of a second set of test science measurements made since it arrived at the Red Planet on 19 October.

Filed Under: RSS Kosmos

Are we nearing finding the first moon outside our solar system?

6.12.2016 by Kaido Reivelt

A promising candidate could yield an amazing find.

Filed Under: RSS Kosmos

A new instrument could give a clear view of distant exoplanets

6.12.2016 by Kaido Reivelt

Direct imaging may be a whole lot easier.

Filed Under: RSS Kosmos

Electric-blue ice clouds seeded by meteor dust have been spied over Antarctica by a NASA spacecraft

6.12.2016 by Kaido Reivelt

Not to worry, this is normal. But climate change may be playing a role.

Filed Under: RSS Kosmos

Captured moons of the giant planets

6.12.2016 by Kaido Reivelt

Most satellites of the outer solar system didn’t form with their host planets. So where did they come from?

Filed Under: RSS Kosmos

Semiconductor quantum wells with BenDaniel–Duke boundary conditions: approximate analytical results

6.12.2016 by Kaido Reivelt

The Schrödinger equation for a particle moving in a square well potential with BenDaniel–Duke
boundary conditions is solved. Using algebraic approximations for trigonometric functions, the
transcendental equations of the bound states energy are tr…

Filed Under: RSS Füüsikaharidus

The bead on a rotating hoop revisited: an unexpected resonance

6.12.2016 by Kaido Reivelt

The bead on a rotating hoop is a typical problem in mechanics, frequently posed to junior science
and engineering students in basic physics courses. Although this system has a rich dynamics, it is
usually not analysed beyond the point particle approx…

Filed Under: RSS Füüsikaharidus

An elementary approach to electromagnetic momentum in matter

6.12.2016 by Kaido Reivelt

We present an elementary discussion of the momentum transferred to a conducting sheet by an
electromagnetic wave propagating in a linear homogeneous polarisable medium. We show that
conservation of momentum is consistent with Minkowski’s expression…

Filed Under: RSS Füüsikaharidus

On the impedance of infinite LC ladder networks

6.12.2016 by Kaido Reivelt

The subject of electrical impedance is on the syllabi of most undergraduate courses in physics and
electrical engineering. For example, Richard Feynman in his famous undergraduate text Lectures on
Physics shows how to calculate the impedance of an in…

Filed Under: RSS Füüsikaharidus

Semiconductor quantum wells with BenDaniel–Duke boundary conditions: approximate analytical results

6.12.2016 by Kaido Reivelt

The Schrödinger equation for a particle moving in a square well potential with BenDaniel–Duke
boundary conditions is solved. Using algebraic approximations for trigonometric functions, the
transcendental equations of the bound states energy are tr…

Filed Under: RSS Füüsikaharidus

An elementary approach to electromagnetic momentum in matter

6.12.2016 by Kaido Reivelt

We present an elementary discussion of the momentum transferred to a conducting sheet by an
electromagnetic wave propagating in a linear homogeneous polarisable medium. We show that
conservation of momentum is consistent with Minkowski’s expression…

Filed Under: RSS Füüsikaharidus

On the impedance of infinite LC ladder networks

6.12.2016 by Kaido Reivelt

The subject of electrical impedance is on the syllabi of most undergraduate courses in physics and
electrical engineering. For example, Richard Feynman in his famous undergraduate text Lectures on
Physics shows how to calculate the impedance of an in…

Filed Under: RSS Füüsikaharidus

The bead on a rotating hoop revisited: an unexpected resonance

6.12.2016 by Kaido Reivelt

The bead on a rotating hoop is a typical problem in mechanics, frequently posed to junior science
and engineering students in basic physics courses. Although this system has a rich dynamics, it is
usually not analysed beyond the point particle approx…

Filed Under: RSS Füüsikaharidus

Joseph Henry’s role in the discovery of electromagnetic induction

6.12.2016 by Kaido Reivelt

The discovery of electromagnetic induction in the early part of the 19th century is one of the
greatest scientific achievements of all time, and it has had tremendous technological consequences.
The credit for this discovery rightfully goes to the gr…

Filed Under: RSS Füüsikaharidus

Cassini Makes First Ring-Grazing Plunge

5.12.2016 by Kaido Reivelt

NASA’s Saturn-orbiting Cassini spacecraft has made its first close dive past the outer edges of Saturn’s rings.

Filed Under: RSS Kosmos

Spinoff 2017: NASA Tech Makes a Difference on Earth

5.12.2016 by Kaido Reivelt

NASA’s new Spinoff 2017 publication looks at 50 companies that use NASA tech innovations (including JPL technology) in products that will benefit all of us.

Filed Under: RSS Kosmos

Curiosity Rover Team Examining New Drill Hiatus

5.12.2016 by Kaido Reivelt

Mars Curiosity is studying its surroundings and monitoring, not driving or using its arm for science, while the team diagnoses an issue with a motor that moves the drill.

Filed Under: RSS Kosmos

Curiosity Rover Team Examining New Drill Hiatus

5.12.2016 by Kaido Reivelt

Mars Curiosity is studying its surroundings and monitoring, not driving or using its arm for science, while the team diagnoses an issue with a motor that moves the drill.

Filed Under: RSS Kosmos

Spinoff 2017: NASA Tech Makes a Difference on Earth

5.12.2016 by Kaido Reivelt

NASA’s new Spinoff 2017 publication looks at 50 companies that use NASA tech innovations (including JPL technology) in products that will benefit all of us.

Filed Under: RSS Kosmos

Cassini Makes First Ring-Grazing Plunge

5.12.2016 by Kaido Reivelt

NASA’s Saturn-orbiting Cassini spacecraft has made its first close dive past the outer edges of Saturn’s rings.

Filed Under: RSS Kosmos

Vega lofts Turkey’s Earth observation satellite

5.12.2016 by Kaido Reivelt

Arianespace today launched a Vega rocket on a commercial mission to deliver a Turkish Earth observation satellite into orbit.

Filed Under: RSS Kosmos

Vega lofts Turkey’s Earth observation satellite

5.12.2016 by Kaido Reivelt

Arianespace today launched a Vega rocket on a commercial mission to deliver a Turkish Earth observation satellite into orbit.

Filed Under: RSS Kosmos

Experimental Rectification of Entropy Production by Maxwell’s Demon in a Quantum System

5.12.2016 by Kaido Reivelt

Author(s): Patrice A. Camati, John P. S. Peterson, Tiago B. Batalhão, Kaonan Micadei, Alexandre M. Souza, Roberto S. Sarthour, Ivan S. Oliveira, and Roberto M. Serra

A new implementation of a Maxwell’s demon can control entropy production in a quantum-mechanical system that is driven out of thermal equilibrium.


[Phys. Rev. Lett. 117, 240502] Published Mon Dec 05, 2016

Filed Under: RSS Teadus

Nuclear Excitation by Two-Photon Electron Transition

5.12.2016 by Kaido Reivelt

Author(s): A. V. Volotka, A. Surzhykov, S. Trotsenko, G. Plunien, Th. Stöhlker, and S. Fritzsche

An alternative mechanism for inducing nuclear excitation may provide a sensitive tool for probing metastable states of nuclei.


[Phys. Rev. Lett. 117, 243001] Published Mon Dec 05, 2016

Filed Under: RSS Teadus

Experimental Rectification of Entropy Production by Maxwell’s Demon in a Quantum System

5.12.2016 by Kaido Reivelt

Author(s): Patrice A. Camati, John P. S. Peterson, Tiago B. Batalhão, Kaonan Micadei, Alexandre M. Souza, Roberto S. Sarthour, Ivan S. Oliveira, and Roberto M. Serra

A new implementation of a Maxwell’s demon can control entropy production in a quantum-mechanical system that is driven out of thermal equilibrium.


[Phys. Rev. Lett. 117, 240502] Published Mon Dec 05, 2016

Filed Under: RSS Teadus

Nuclear Excitation by Two-Photon Electron Transition

5.12.2016 by Kaido Reivelt

Author(s): A. V. Volotka, A. Surzhykov, S. Trotsenko, G. Plunien, Th. Stöhlker, and S. Fritzsche

An alternative mechanism for inducing nuclear excitation may provide a sensitive tool for probing metastable states of nuclei.


[Phys. Rev. Lett. 117, 243001] Published Mon Dec 05, 2016

Filed Under: RSS Teadus

A ‘Star Trek’-like anti-matter engine could power humanity to the nearest star

5.12.2016 by Kaido Reivelt

This potential travel method could be the key to interstellar travel

Filed Under: RSS Kosmos

Could there really be life under Pluto’s ice?

5.12.2016 by Kaido Reivelt

It’s a long shot, but it may still push the boundaries of the habitable zone

Filed Under: RSS Kosmos

Stormy skies

5.12.2016 by Kaido Reivelt


Space Science Image of the Week: A storm in Saturn’s atmosphere that raged for over 200 days

Filed Under: RSS Kosmos

Students Test Their Concepts in JPL Invention Challenge

2.12.2016 by Kaido Reivelt

Now in its 19th year, the competition drew students from across Southern California — and even as far away as Tanzania.

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Students Test Their Concepts in JPL Invention Challenge

2.12.2016 by Kaido Reivelt

Now in its 19th year, the competition drew students from across Southern California — and even as far away as Tanzania.

Filed Under: RSS Kosmos

European ministers ready ESA for a United Space in Europe in the era of Space 4.0

2.12.2016 by Kaido Reivelt

ESA today concluded a two-day Council meeting at ministerial level in Lucerne, Switzerland. Ministers in charge for space  matters from ESA’s 22 member states plus Slovenia and Canada allocated €10.3 billion for space activities and programmes based on the vision of a United Space in Europe in the era of Space 4.0.

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United Space in Europe

2.12.2016 by Kaido Reivelt

European ministers ready ESA for a United Space in Europe in the era of Space 4.0

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Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide

2.12.2016 by Kaido Reivelt

Author(s): J. S. Hummelt, X. Lu, H. Xu, I. Mastovsky, M. A. Shapiro, and R. J. Temkin

A system that produces radiation by sending electrons through a metamaterial waveguide could potentially generate high-power microwaves with high efficiency.


[Phys. Rev. Lett. 117, 237701] Published Fri Dec 02, 2016

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Mutation at Expanding Front of Self-Replicating Colloidal Clusters

2.12.2016 by Kaido Reivelt

Author(s): Hidenori Tanaka, Zorana Zeravcic, and Michael P. BrennerThe emergence of mutations is studied in a system of self-replicating colloids, showing behavior similar to that seen in growing bacterial colonies.[Phys. Rev. Lett. 117, 238004] Publis…

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Experimental Observation of a Topological Band Gap Opening in Ultracold Fermi Gases with Two-Dimensional Spin-Orbit Coupling

2.12.2016 by Kaido Reivelt

Author(s): Zengming Meng, Lianghui Huang, Peng Peng, Donghao Li, Liangchao Chen, Yong Xu, Chuanwei Zhang, Pengjun Wang, and Jing ZhangThe topological band gap in a Fermi gas is controlled by tuning the polarization of Raman lasers that create a perpend…

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Proving Nontrivial Topology of Pure Bismuth by Quantum Confinement

2.12.2016 by Kaido Reivelt

Author(s): S. Ito, B. Feng, M. Arita, A. Takayama, R.-Y. Liu, T. Someya, W.-C. Chen, T. Iimori, H. Namatame, M. Taniguchi, C.-M. Cheng, S.-J. Tang, F. Komori, K. Kobayashi, T.-C. Chiang, and I. MatsudaCharacterization of the nontrivial topology in bism…

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Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide

2.12.2016 by Kaido Reivelt

Author(s): J. S. Hummelt, X. Lu, H. Xu, I. Mastovsky, M. A. Shapiro, and R. J. Temkin

A system that produces radiation by sending electrons through a metamaterial waveguide could potentially generate high-power microwaves with high efficiency.


[Phys. Rev. Lett. 117, 237701] Published Fri Dec 02, 2016

Filed Under: RSS Teadus

Experimental Observation of a Topological Band Gap Opening in Ultracold Fermi Gases with Two-Dimensional Spin-Orbit Coupling

2.12.2016 by Kaido Reivelt

Author(s): Zengming Meng, Lianghui Huang, Peng Peng, Donghao Li, Liangchao Chen, Yong Xu, Chuanwei Zhang, Pengjun Wang, and Jing ZhangThe topological band gap in a Fermi gas is controlled by tuning the polarization of Raman lasers that create a perpend…

Filed Under: RSS Teadus

Proving Nontrivial Topology of Pure Bismuth by Quantum Confinement

2.12.2016 by Kaido Reivelt

Author(s): S. Ito, B. Feng, M. Arita, A. Takayama, R.-Y. Liu, T. Someya, W.-C. Chen, T. Iimori, H. Namatame, M. Taniguchi, C.-M. Cheng, S.-J. Tang, F. Komori, K. Kobayashi, T.-C. Chiang, and I. MatsudaCharacterization of the nontrivial topology in bism…

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Mutation at Expanding Front of Self-Replicating Colloidal Clusters

2.12.2016 by Kaido Reivelt

Author(s): Hidenori Tanaka, Zorana Zeravcic, and Michael P. BrennerThe emergence of mutations is studied in a system of self-replicating colloids, showing behavior similar to that seen in growing bacterial colonies.[Phys. Rev. Lett. 117, 238004] Publis…

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Media briefing replay

2.12.2016 by Kaido Reivelt

Replay of the media briefing at the close of ESA’s Council meeting at Ministerial level, Lucerne, 2 December 2016

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Week In Images

2.12.2016 by Kaido Reivelt

Our week through the lens: 28 November – 2 December 2016

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When meteors confront a Full Moon

2.12.2016 by Kaido Reivelt

Despite the brightness of our lone natural satellite, observers still may see some of this year’s brightest Geminid meteors.

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Nordic entrepreneurial spirit boosted by space

2.12.2016 by Kaido Reivelt

More than 17 000 people converged on Helsinki in Finland this week to create businesses – and ESA was there to add its space expertise.   

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Nordic entrepreneurial spirit boosted by space

2.12.2016 by Kaido Reivelt

More than 17 000 people converged on Helsinki in Finland this week to create businesses – and ESA was there to add its space expertise.   

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Interevent Correlations from Avalanches Hiding Below the Detection Threshold

1.12.2016 by Kaido Reivelt

Author(s): Sanja Janićević, Lasse Laurson, Knut Jørgen Måløy, Stéphane Santucci, and Mikko J. Alava

A study of bursting phenomena like earthquakes suggests that events appear to cluster in time because of the way that small events like aftershocks are identified.


[Phys. Rev. Lett. 117, 230601] Published Thu Dec 01, 2016

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Magnetorotational Turbulence and Dynamo in a Collisionless Plasma

1.12.2016 by Kaido Reivelt

Author(s): Matthew W. Kunz, James M. Stone, and Eliot QuataertThe evolution of magnetorotational turbulence is tracked in 3D kinetic simulations for the first time.[Phys. Rev. Lett. 117, 235101] Published Thu Dec 01, 2016

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Magnetorotational Turbulence and Dynamo in a Collisionless Plasma

1.12.2016 by Kaido Reivelt

Author(s): Matthew W. Kunz, James M. Stone, and Eliot QuataertThe evolution of magnetorotational turbulence is tracked in 3D kinetic simulations for the first time.[Phys. Rev. Lett. 117, 235101] Published Thu Dec 01, 2016

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Interevent Correlations from Avalanches Hiding Below the Detection Threshold

1.12.2016 by Kaido Reivelt

Author(s): Sanja Janićević, Lasse Laurson, Knut Jørgen Måløy, Stéphane Santucci, and Mikko J. Alava

A study of bursting phenomena like earthquakes suggests that events appear to cluster in time because of the way that small events like aftershocks are identified.


[Phys. Rev. Lett. 117, 230601] Published Thu Dec 01, 2016

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Earth from Space

1.12.2016 by Kaido Reivelt


Join us Friday, 2 December, at 10:00 CET for the ‘Earth from Space’ video programme. This week, take a tour of Switzerland with Sentinel-2

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Future power

1.12.2016 by Kaido Reivelt


Operations image of the week: Young and ‘young at heart’ engineers and scientists visit ESA’s mission control

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Super-Galaxies Don’t Become Cannibals Until Later in Life

1.12.2016 by Kaido Reivelt

In their early years, the largest galaxies in the universe feed on recycled material from dead stars.

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From Monterey Bay to Europa

30.11.2016 by Kaido Reivelt

Underwater drone research could change how we study the ocean — and could eventually look for life on other planets.

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From Monterey Bay to Europa

30.11.2016 by Kaido Reivelt

Underwater drone research could change how we study the ocean — and could eventually look for life on other planets.

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Forces on Rigid Inclusions in Elastic Media and Resulting Matrix-Mediated Interactions

30.11.2016 by Kaido Reivelt

Author(s): Mate Puljiz, Shilin Huang, Günter K. Auernhammer, and Andreas M. Menzel

Theorists correctly predict the change in position of paramagnetic particles embedded in a gel and subject to a magnetic field by considering the effective elastic interparticle interactions.


[Phys. Rev. Lett. 117, 238003] Published Wed Nov 30, 2016

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Forces on Rigid Inclusions in Elastic Media and Resulting Matrix-Mediated Interactions

30.11.2016 by Kaido Reivelt

Author(s): Mate Puljiz, Shilin Huang, Günter K. Auernhammer, and Andreas M. Menzel

Theorists correctly predict the change in position of paramagnetic particles embedded in a gel and subject to a magnetic field by considering the effective elastic interparticle interactions.


[Phys. Rev. Lett. 117, 238003] Published Wed Nov 30, 2016

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Time-Reversal-Breaking Weyl Fermions in Magnetic Heusler Alloys

30.11.2016 by Kaido Reivelt

Author(s): Zhijun Wang, M. G. Vergniory, S. Kushwaha, Max Hirschberger, E. V. Chulkov, A. Ernst, N. P. Ong, Robert J. Cava, and B. Andrei Bernevig

Weyl materials with only two Weyl nodes are predicted in a time-reversal-breaking system.


[Phys. Rev. Lett. 117, 236401] Published Wed Nov 30, 2016

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Time-Reversal-Breaking Weyl Fermions in Magnetic Heusler Alloys

30.11.2016 by Kaido Reivelt

Author(s): Zhijun Wang, M. G. Vergniory, S. Kushwaha, Max Hirschberger, E. V. Chulkov, A. Ernst, N. P. Ong, Robert J. Cava, and B. Andrei Bernevig

Weyl materials with only two Weyl nodes are predicted in a time-reversal-breaking system.


[Phys. Rev. Lett. 117, 236401] Published Wed Nov 30, 2016

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Laser tuning fork

30.11.2016 by Kaido Reivelt

Technology image of the week: What looks like an abstract sculpture is actually the laser equivalent of a tuning fork

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Cold plasma freshens up French fries

30.11.2016 by Kaido Reivelt

Bad smells from deep-fat frying in restaurants and take-away food venues could soon be eradicated thanks to experiments funded by ESA on the International Space Station.

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Cold plasma freshens up French fries

30.11.2016 by Kaido Reivelt

Bad smells from deep-fat frying in restaurants and take-away food venues could soon be eradicated thanks to experiments funded by ESA on the International Space Station.

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Living with Space 4.0

30.11.2016 by Kaido Reivelt

Faster Internet, forecasting our weather, navigation, safer air traffic, telemedicine, precision farming, natural disaster monitoring – just some of the benefits for us all

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Living with Space 4.0

30.11.2016 by Kaido Reivelt

Faster Internet, forecasting our weather, navigation, safer air traffic, telemedicine, precision farming, natural disaster monitoring – just some of the benefits for us all

Filed Under: RSS Kosmos

This asteroid is so small, it could fit in your living room

30.11.2016 by Kaido Reivelt

At 2 meters in diameter, it’s a small, bright piece of natural space debris.

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