Tag Archives: experiment

Tiefseebergbau hinterlässt tiefe Narben

Gemeinsam mit einem internationalen Team haben Senckenberg-Wissenschaftlerinnen die Auswirkungen von Tiefseebergbau – wie den Abbau von Manganknollen – auf die Artenvielfalt am Meeresboden untersucht. Sie zeigen, dass auch 26 Jahre nach dem Abbau ein erheblicher Verlust bodenlebender Organismen zu verzeichnen ist. Insbesondere filtrierende Tiere sind betroffen – über zwei Jahrzehnte nach dem Abbau bleiben knapp 80 Prozent dieser Arten verschwunden. Die Studie erschien kürzlich im Fachjournal „Biogeosciences“. (more…)

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Mikromechanik und Schaltkreis im Gleichklang

Einen neuen Vorschlag für die Kopplung eines mikromechanischen Oszillators an einen supraleitenden Quantenschaltkreis präsentieren Physiker um Oriol Romero-Isart und Gerhard Kirchmair. Das Experiment soll demnächst umgesetzt werden und neue Einblicke in die Quanteneigenschaften von makroskopischen mechanischen Systemen liefern.

Nicht nur elementare Quantensysteme wie Photonen, Elektronen oder Atome unterliegen den Gesetzen der Quantenphysik. Auch winzige, mechanisch schwingende Objekte sind bei Temperaturen nahe dem absoluten Nullpunkt diesem Regime unterworfen. Physiker in aller Welt versuchen seit Jahren die Eigenschaften solcher mechanischer Systeme experimentell zu erforschen. Der Theoretiker Oriol Romero-Isart und der Experimentalphysiker Gerhard Kirchmair haben nun gemeinsam mit Guillem Via ein Experiment vorgeschlagen, das Unzulänglichkeiten früherer Ansätze überwinden helfen könnte. Während in bisherigen Untersuchungen der mechanische Oszillator über elektrische Felder an den supraleitenden Schaltkreis gekoppelt wurde, schlagen die Innsbrucker Physiker nun eine magnetische Kopplung der beiden Systeme vor. (more…)

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Verbesserte Schnittstelle für Quanten-Internet

Ein Quantennetzwerk benötigt effiziente Schnittstellen, über die Information von Materie auf Licht und umgekehrt übertragen werden kann. Wie dieser Informationstransfer unter Ausnutzung eines kollektiven Quantenphänomens optimiert werden kann, zeigen Innsbrucker Physiker um Rainer Blatt und Tracy Northup nun in der Fachzeitschrift Physical Review Letters. (more…)

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UMass Amherst Nuclear Physicist, with Hundreds Worldwide, Tracks Huge Magnetic Ring across Country for Muon Experiments

Massive device to travel by barge and truck this summer

AMHERST, Mass. – Nuclear physicist David Kawall at the University of Massachusetts Amherst is among scientists from 26 institutions worldwide who are waiting patiently for an electromagnet 50 feet in diameter to be transported from New York to Illinois, where they plan to launch an experiment in 2016 that could open new realms of particle physics.

Kawall’s responsibility will be to measure very precisely the magnetic field inside the ring-shaped magnet when it arrives at its new home sometime in late July. “It’s definitely new territory,” he says, “because we need to measure the field accurately to 70 parts per billion in this huge magnet. The payoff is enormous, however, because we expect the new experiment to yield results four times more precise than the previous effort was able to attain.” (more…)

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Experiments Inform Study of Crowd Motion

To determine how crowd behavior emerges from individual actions, William Warren, professor of cognitive, linguistic, and psychological sciences, assembled his own crowds and engaged them in an unusual four-day experiment in Sayles Hall. The subjects were equipped with motion capture markers affixed like antennae to bike helmets.

PROVIDENCE, R.I. [Brown University] — What must the staid-faced University luminaries in those portraits around Sayles Hall have thought while they watched this scene play out for four days last week? Over and over, two to 20 young men and women in bike helmets adorned with what appeared to be five large antennae walked back and forth across a cardboard-covered floor. En route to goals marked by numbers just beneath the portraits, they dodged each other and arrangements of cardboard pillars. Each time they generated patterns of foot traffic. (more…)

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Diamond in The Rough: Half-Century Puzzle Solved

A Yale-led team of mineral physicists has for the first time confirmed through high-pressure experiments the structure of cold-compressed graphite, a form of carbon that is comparable in hardness to its cousin, diamond, but only requires pressure to synthesize. The researchers believe their findings could open the way for a super hard material that can withstand great force and can be used — as diamond-based materials are now — for many electronic and industrial applications. The study appears in Scientific Reports, a Nature journal.

Under normal conditions, pure carbon exhibits vastly different physical properties depending on its structure. For example, graphite is soft, but diamond is one of the hardest materials known. Graphite conducts electricity, but diamond is an insulator. (more…)

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“Losing Yourself” in A Fictional Character Can Affect Your Real Life

COLUMBUS, Ohio – When you “lose yourself” inside the world of a fictional character while reading a story, you may actually end up changing your own behavior and thoughts to match that of the character, a new study suggests.

Researchers at Ohio State University examined what happened to people who, while reading a fictional story, found themselves feeling the emotions, thoughts, beliefs and internal responses of one of the characters as if they were their own – a phenomenon the researchers call “experience-taking.” (more…)

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