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80 articles from PhysOrg

Newly available GPS data helps scientists better understand ionosphere

A new data source to help scientists better understand the ionosphere and its potential impact on communications and positioning, navigation, and timing—an essential utility for many critical operations—is now available to the public. The data, which was collected by sensors on GPS satellites in 2018, was released today through a collaborative effort by Los Alamos National Laboratory and the...

Researchers reach quantum networking milestone in real-world environment

A team from the U.S. Department of Energy's Oak Ridge National Laboratory, Stanford University and Purdue University developed and demonstrated a novel, fully functional quantum local area network, or QLAN, to enable real-time adjustments to information shared with geographically isolated systems at ORNL using entangled photons passing through optical fiber.

Novel quantum effect discovered in naturally occurring graphene

Usually, the electrical resistance of a material depends very much on its physical dimensions and fundamental properties. Under special circumstances, however, this resistance can adopt a fixed value that is independent of the basic material properties and "quantised" (meaning that it changes in discrete steps rather than continuously). This quantisation of electrical resistance normally occurs...

Bacteria enters through natural openings at edges of corn leaves to cause Goss's wilt

Goss's bacterial wilt and leaf blight is one of the most damaging diseases affecting corn. The most effective way to control this disease is to plant corn varieties that are resistant to the disease. In other words, growers avoid the disease by growing certain varieties of corn. In part, this is the easiest method because scientists don't yet know much about Goss's wilt.

New approach to skeletal age-estimation can help identify child remains

Forensic teams challenged with identifying skeletal remains may benefit from a new method of determining age in child remains when traditional methods, such as dental records, aren't available. New research from SFU archeologists finds that measuring cranial bones can provide one of the most comprehensive methods of estimating juvenile age.

Dwarf planet Vesta serves as a window to the early solar system

The dwarf planet Vesta is helping scientists better understand the earliest era in the formation of our solar system. Two recent papers involving scientists from the University of California, Davis, use data from meteorites derived from Vesta to resolve the "missing mantle problem" and push back our knowledge of the solar system to just a couple of million years after it began to form. The papers...

Literature review: Ten years of research on oil and gas industry's methane and health-damaging air pollutant emissions

Oil and gas emissions vary widely throughout the supply chain, making mitigation of both super-emitters and emissions sources near populations top priorities for public health and climate, according to findings from a literature review by the nonprofit energy science and policy institute Physicians, Scientists, and Engineers (PSE) for Healthy Energy. "Methane and Health-Damaging Air Pollutants...

A study of skull growth and tooth emergence reveals that timing is everything

Six, 12, and 18. These are the ages that most people get their three adult molars or large chewing teeth towards the back of the mouth. These teeth come in at a much later age than they do in our closest living relative, the chimpanzee, who get those same adult molars at around three, six, and 12 years old. Paleoanthropologists have wondered for a long time how and why humans evolved molars that...

Line and hook fishing techniques in Epipaleolithic Israel

Humans in the Middle East were using complex fishing tools and techniques by 12,000 years ago, according to a study published October 6, 2021 in the open-access journal PLOS ONE by Antonella Pedergnana of the Archaeological Research Centre and Museum for Human Behavioural Evolution in Mainz, Germany and colleagues.

Just how big was the 2020 Beirut explosion?

On Aug. 4, 2020, one of the largest non-nuclear explosions in history pulverized a Beirut port and damaged more than half the city. The explosion resulted from the detonation of tons of ammonium nitrate, a combustible chemical compound commonly used in agriculture as a high-nitrate fertilizer, but which can also be used to manufacture explosives.

New catalyst helps combine fuel cell, battery into one device

A single device that both generates fuel and oxidant from water and, when a switch is flipped, converts the fuel and oxygen into electricity and water, has a host of benefits for terrestrial, space and military applications. From low environmental impact to high energy density, developing efficient unitized regenerative fuel cells, or URFCs as they are called, has been in researchers' sights for...

Climate change adaptation requires Indigenous knowledge

In rural and Indigenous communities with limited access to weather data, generations of farmers, fishers, herders, hunters and orchardists have relied on indicators such as the first snowfall, emergence of a certain plant or arrival of a bird species to guide when to plant, harvest or perform other tasks. But because of climate change, many of these ecological patterns have shifted.