Science & Technology

Displaying 21 - 30 of 692 articles
Penn Physicists Shed Light on How Wetness Affects a Phenomenon in Foams
December 4, 2017
Whether drinking beer, eating ice cream or washing the dishes, it’s fair to say that many people come across foam on a day-to-day basis. It’s in everything from detergents to beverages to cosmetics. Outside of everyday life, it has applications in areas such as firefighting, isolating toxic materials and distributing chemicals. But there’s still a lot to be learned about this ubiquitous material.
New Dental Material Resists Plaque and Kills Microbes, Penn Dental Team Finds
December 4, 2017
Dentists rely on composite materials to perform restorative procedures, such as filling cavities. Yet these materials, like tooth enamel, can be vulnerable to the growth of plaque, the sticky biofilm that leads to tooth decay.
Penn Study: To Drop CO2 Emissions, Look to Local Transportation and Housing
November 30, 2017
Local efforts in the transportation and residential-housing sectors could help the United States meet the greenhouse gas reduction commitment it made as a Paris Climate Accord signatory, according to research from John Landis and Erick Guerra of the School of Design.
Penn Researchers Develop an Injectable Gel that Helps Heart Muscle Regenerate after a Heart Attack
November 29, 2017
In mammals, including humans, the cells that contract the heart muscle and enable it to beat do not regenerate after injury. After a heart attack, there is a dramatic loss of these heart muscle cells and those that survive cannot effectively replicate. With fewer of these contractile cells, known as cardiomyocytes, the heart pumps less blood with each beat, leading to the increased mortality associated with heart disease.
Penn Researchers Establish Universal Signature Fundamental to How Glassy Materials Fail
November 28, 2017
Dropping a smartphone on its glass screen, which is made of atoms jammed together with no discernible order, could result in it shattering. Unlike metals and other crystalline materials, glass and many other disordered solids cannot be deformed significantly before failing and, because of their lack of crystalline order, it is difficult to predict which atoms would change during failure.
Penn Junior Jack Stack Is Pursuing His Paleontological Dream
November 28, 2017
Some paleontologists travel far and wide to seek new fossils — to the desert Southwest of the United States, remote regions of China or the farthest tip of Argentina. University of Pennslyvania student Jack Stack, on the other hand, made his first paleontological discoveries much closer to home. At home, in fact.
Penn Neuroscientists Construct First Whole-brain Map Showing Electrical Connections Key to Forming Memories
November 22, 2017
A team of neuroscientists at the University of Pennsylvania has constructed the first whole-brain map of electrical connectivity in the brain based on data from nearly 300 neurosurgical patients with electrodes implanted directly on the brain. The researchers found that low-frequency rhythms of brain activity, when brain waves move up and down slowly, primarily drive communication between the frontal, temporal and medial temporal lobes, key brain regions that engage during memory processing. 
Four Penn Professors Among 2017 Class of AAAS Fellows
November 20, 2017
Four members of the University of Pennsylvania faculty have been named Fellows of the American Association for the Advancement of Science. Election as an AAAS Fellow is an honor bestowed upon members of AAAS, the world’s largest general scientific society, by their peers.
Penn Engineers Develop Microchip Laser Stabilizer, Enabling Faster Data Transfer
November 20, 2017
With streaming movies and UltraHD television taking more and more bandwidth, there is a race to deliver data into people’s homes as quickly as possible. Light-based fiber optic connections promise far faster data rates than standard electricity-based coaxial cables, so making laser sources smaller, cheaper and more stable is a high priority for engineers.
‘Brazil Nut Effect’ Helps Explain How Rivers Resist Erosion, Penn Team Finds
November 20, 2017
Pop the top off a can of mixed nuts and, chances are, Brazil nuts will be at the top. This phenomenon, of large particles tending to rise to the top of mixtures while small particles tend to sink down, is popularly known as the “Brazil nut effect” and more technically as granular segregation. Look down at the top of a riverbed and it’s easy to draw a parallel: the top of a riverbed is typically lined with larger cobbles, while finer sand and small gravel particles make up the deeper layers.