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85 articles from PhysOrg

Satellite data record shows climate change's impact on fires

"Hot and dry" are the watchwords for large fires. In just seconds, a spark in hot and dry conditions can set off an inferno consuming thick, dried-out vegetation and almost everything else in its path. While every fire needs a spark to ignite and fuel to burn, hot and dry conditions in the atmosphere play a significant role in determining the likelihood of a fire starting, its intensity and the...

New method of analyzing networks reveals hidden patterns in data

A new way of measuring how relationships in a network change over time can reveal important details about the network, according to researchers at Penn State and the Korean Rural Economic Institute. For example, when applied to the world economy, the method detected the greatest amount of network change during 2008-2009, the time of the global financial crisis.

Government housing voucher program effectively reduces homeless veteran population

Homelessness is a persistent and significant public policy and public health challenge, disproportionately affecting veterans. However, the fiscal year 2020 budget negotiated between President Donald Trump and Speaker Nancy Pelosi includes no growth in funding for the Housing and Urban Development-Veterans Affairs Supportive Housing (HUD-VASH) voucher program.

Promising mobile technologies find methane leaks quickly, study finds

On trucks, drones and airplanes, 10 promising technologies for finding natural gas leaks swiftly and cheaply competed in the Mobile Monitoring Challenge, the first independent assessment of moving gas leak detectors at well sites. The organizers of the contest—Stanford University's Natural Gas Initiative and the Environmental Defense Fund—describe the outcomes in a study published Sept. 10 in...

A little kindness goes a long way for worker performance and health

Small gestures of kindness by employers can have big impacts on employees' health and work performance, according to an international team of researchers. The team specifically examined the effects of employers enhancing the lunches of bus drivers in China with fresh fruit and found that it reduced depression among the drivers and increased their confidence in their own work performance.

From New York to Chile, lead contamination project develops citizen science

If you live in an industrial-era urban setting, chances are that soil in your vicinity is contaminated with lead, arsenic, or other heavy metals. With support from the National Science Foundation, a team of researchers is developing a "citizen science" soil research project in Troy, New York and Tierra Amarilla, Chile that engages residents in greater understanding of contaminants in their midst...

Tides don't always flush water out to sea, study shows

By area, tidal flats make up more than 50 percent of Willapa Bay in southwest Washington state, making this more than 142-square-mile estuary an ideal location for oyster farming. On some parts of these flats, oysters grow well, filling their shells with delicacies for discerning diners. But according to experienced oyster farmers, oysters raised in other parts of Willapa Bay don't yield as much...

Mathematical model could help correct bias in measuring bacterial communities

Researchers from North Carolina State University have developed a mathematical model that shows how bias distorts results when measuring bacterial communities through metagenomic sequencing. The proof-of-concept model could be the first step toward developing calibration methods that could make metagenomic measurements more accurate.

Microorganisms reduce methane release from the ocean

Next to CO2, methane is the greenhouse gas that contributes most to the man-made greenhouse effect. Of the methane sources caused by human activity, rice fields and cattle are among the most important. Furthermore, methane is released from swamp areas on land, melting permafrost in the Arctic tundra, and from areas with oxygen depletion in the oceans.

Chicken study reveals that environmental factors, not just chance, could drive species evolution

In the version of evolutionary theory most of us are familiar with, randomly occurring variation in traits, caused by mutations in our DNA, can be fixed in a population through natural selection. However, writing in Epigenetics journal, a team of Swedish researchers from Linköping University suggests that mutations that can be caused by environmental changes, not just random chance, might be...

New insights help to explain why same-sex sexual interactions are so important for female bonobos

Among our two closest phylogenetic relatives, chimpanzees remain by far the more thoroughly-studied and widely-recognized species, known for their high levels of cooperation especially among males, which includes sharing food, supporting each other in aggressive conflicts and defending their territories against other communities. In contrast, insights into the social dynamics of wild bonobos are...

Future of portable electronics: Novel organic semiconductor with exciting properties

Semiconductors are substances that have a conductivity between that of conductors and insulators. Due to their unique properties of conducting current only in specific conditions, they can be controlled or modified to suit our needs. Nowhere is the application of semiconductors more extensive or important than in electrical and electronic devices, such as diodes, transistors, solar cells, and...