feed info

77 articles from PhysOrg

Diverse landcover boosts yields for major U.S. crops, study finds

Monoculture—or specializing in a single crop, covering larger fields that can be harvested with bigger machines on a simplified landscape—is widely assumed to boost a farm's production capacity. A major study encompassing the mainland United States, however, suggests that the opposite is true. Nature Food published the research.

Wing shape determines how far birds disperse

Bird dispersal movements are thought to depend on complex demographic and genetic factors. Dr. Santiago Claramunt, Associate Curator of Birds at the Royal Ontario Museum (ROM) and Assistant Professor in the Department of Ecology and Evolutionary Biology of the University of Toronto, shows that there may be a simpler explanation: bird dispersal distances depend on the morphology and flight...

NASA works to give satellite swarms a hive mind

Swarms of small satellites could communicate amongst themselves to collect data on important weather patterns at different times of the day or year, and from multiple angles. Such swarms, using machine learning algorithms, could revolutionize scientists' understanding of weather and climate changes.

Examining asteroid Ryugu in opposition to Hayabusa2: A starkly lit distribution of dust and rock

New analysis of Hayabusa2 data of the asteroid Ryugu reveals much of the surface reflects and scatters light in ways that are consistent with studies of carbonaceous chondrite meteorites in the lab. This research looks specifically at data taken while Ryugu was in opposition to the spacecraft and Sun, and utilizes Hayabusa2's near infrared spectrometer, NIRS3, and Optical Navigation Camera, ONC,...

Putting a new theory of many-particle quantum systems to the test

New experiments using trapped one-dimensional gases—atoms cooled to the coldest temperatures in the universe and confined so that they can only move in a line—fit with the predictions of the recently developed theory of "generalized hydrodynamics." Quantum mechanics is necessary to describe the novel properties of these gases. Achieving a better understanding of how such systems with many...

Researchers sequence genome of drug-resistant Salmonella enteritidis strain that can sicken poultry

Researchers from North Carolina State University have sequenced the genome of a virulent Salmonella Enteritidis strain that sickened two poultry flocks in consecutive years and found that it was both antibiotic resistant and could potentially infect humans. Characterizing the strain, designated SE_TAU19, will aid public health agencies in tracing outbreaks and preventing exposures.

Do we need an IPCC for food?

The first United Nations Food Systems Summit (UNFSS), scheduled for September, could be as historic to food system transformation as the Rio Earth Summit of 1992 was to climate change. Rio sparked the creation of the Intergovernmental Panel on Climate Change, or IPCC, which has brought scientists and governments around the world together and has greatly increased consensus and understanding of the...

A surprise result for solid state physicists hints at an unusual electron behavior

While studying the behavior of electrons in iron-based superconducting materials, researchers at the University of Tokyo observed a strange signal relating to the way electrons are arranged. The signal implies a new arrangement of electrons the researchers call a nematicity wave, and they hope to collaborate with theoretical physicists to better understand it. The nematicity wave could help...

Study reveals extreme winter weather is related to Arctic change

A new study shows that the frequency of polar vortex disruptions that is most favorable for extreme winter weather in the United States is increasing, and that Arctic change is likely contributing to the increasing trend. Led by Atmospheric and Environmental Research (AER), University Massachusetts Lowell and the Hebrew University of Jerusalem, the study is published in the September 3 issue of...

Stellar collision triggers supernova explosion

Astronomers have found dramatic evidence that a black hole or neutron star spiraled its way into the core of a companion star and caused that companion to explode as a supernova. The astronomers were tipped off by data from the Very Large Array Sky Survey (VLASS), a multi-year project using the National Science Foundation's Karl G. Jansky Very Large Array (VLA).

High hopes for lowly pond scum

Pond scum generally isn't looked upon kindly. But the microalgae that make up these floating green mats of slime could get newfound respect as renewable sources of fuel, specialty chemicals, dietary supplements and other valued products.