Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog – Page 29

In an experiment reminiscent of the “Transformers” movie franchise, engineers at Princeton University have created a type of material that can expand, assume new shapes, move and follow electromagnetic commands like a remotely controlled robot, even though it lacks any motor or internal gears.

“You can transform between a material and a robot, and it is controllable with an ,” said researcher Glaucio Paulino, the Margareta Engman Augustine Professor of Engineering at Princeton.

In an article published in Nature, the researchers describe how they drew inspiration from the folding art of origami to create a structure that blurs the lines between robotics and materials. The invention is a metamaterial, which is a material engineered to feature new and unusual properties that depend on the material’s physical structure rather than its chemical composition.

Read more | >

By breaking a decades-old paradigm and rethinking the role that the dimension of time plays in physics, researchers from the University of Rostock and the University of Birmingham have discovered novel flashes of light that come from and go into nothingness—like magic at first glance but with deep mathematical roots that protect against all kinds of outside perturbations. Their findings have now been published in the journal Nature Photonics.

Time is the strange dimension: Unlike its spatial siblings, it is a one-way street as the clock only ever ticks forward and never backward. Scientists have long been aware of time’s quirks, with the British astrophysicist Sir Arthur Eddington musing about this “arrow of time” in his 1927 lectures. Nevertheless, whether it be because of or despite its uniqueness, time as a dimension for physics to play out in has long received far less attention than space.

Recently though, rapid progress in the research on so-called spatiotemporal crystals, objects with repeating patterns in time and space, has inspired a rethinking of the role time should play in our understanding of physics. Additionally, this has spawned the question of whether the uniqueness of time can be more than a mere quirk and instead lead to new effects ultimately useful in applications.

Read more | >

QUT researchers have identified a new material which could be used as a flexible semiconductor in wearable devices by using a technique that focuses on the manipulation of spaces between atoms in crystals.

In a study published in Nature Communication, the researchers used “vacancy engineering” to enhance the ability of an AgCu(Te, Se, S) semiconductor, which is an alloy made up of silver, copper, tellurium, selenium and sulfur, to convert body heat into electricity.

Vacancy engineering is the study and manipulation of empty spaces, or “vacancies,” in a crystal where atoms are missing, to influence the material’s properties, such as improving its mechanical properties or optimizing its electrical conductivity, or thermal properties.

Read more | >

The relationships between different people can change over time, as the result of their life choices, internal or external experiences and various other factors. Some people develop a greater tendency to avoid others in their lives, including friends, colleagues, family members and acquaintances.

Researchers at Icahn School of Medicine at Mount Sinai recently set out to test the hypothesis that social avoidance could be quantified as people’s navigation in an abstract social space. Their paper, published in Communications Psychology, introduces a new framework for studying and probing people’s social avoidance.

“This work grew out of the idea that the way that people often talk about navigating —’climbing the ladder’ at work, or ‘growing distant’ from a friend—might be more than a metaphor,” Matthew Schafer, first author of the paper, told Phys.org.

Read more | >

People with Alzheimer’s disease may retain their ability to empathize, despite declines in other social abilities, finds a new study led by University College London (UCL) researchers.

The researchers found that people with Alzheimer’s disease scored slightly higher on a measure of empathy than peers of the same age with mild cognitive impairment, despite scoring worse on other measures of such as recognizing facial emotions and understanding the thoughts of others.

The authors of the study, published in Alzheimer’s & Dementia, say this may be the first time a cognitive domain has been found to improve in dementia.

Read more | >

1 State Key Laboratory of Systems Medicine for Cancer, Renji-Med-X Stem Cell Research Center, Department of Urology, Renji Hospital, Shanghai Cancer Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

2Department of Emergency Medicine, Shanghai Seventh People’s Hospital, Seventh People’s Hospital of Shanghai University of Traditional Chinese Medicine, Shanghai, China.

3Med-X Research Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.

Read more | >

We have investigated the rich dynamics of complex wave packets composed of multiple high-lying Rydberg states in He. A quantitative agreement is found between theory and time-resolved photoelectron spectroscopy experiments. We show that the intricate time dependence of such wave packets can be used for investigating quantum defects and performing artifact-free timekeeping. The latter relies on the unique fingerprint that is created by the time-dependent photoionization of these complex wave packets. These fingerprints determine how much time has passed since the wave packet was formed and provide an assurance that the measured time is correct. Unlike any other clock, this quantum watch does not utilize a counter and is fully quantum mechanical in its nature.

Read more | >