1,253 research outputs found
Security and Interoperable Medical Device Systems: Part 1
Interoperable medical devices (IMDs) face threats due to the increased attack surface presented by interoperability and the corresponding infrastructure. Introducing networking and coordination functionalities fundamentally alters medical systems\u27 security properties. Understanding the threats is an important first step in eventually designing security solutions for such systems. Part 1 of this two-part article provides an overview of the IMD environment and the attacks that can be mounted on it
Spin symmetry breaking in bilayer quantum Hall systems
Based on the construction of generalized Halperin wave functions, we predict
the possible existence of a large class of broken spin symmetry states in
bilayer quantum Hall structures, generalizing the recently suggested canted
antiferromgnetic phase to many fractional fillings. We develop the appropriate
Chern-Simons theory, and establish explicitly that the low-lying neutral
excitation is a Goldstone mode and that the charged excitations are bimerons
with continuously tunable (through the canted antiferromagnetic order
parameter) electric charge on the individual merons.Comment: 4 page
Magna Carta Then and Now: A Symbol of Freedom and Equal Rights for All
This article was published in Today (19 November 2015) at 16-17, and is available online at http://www.todayonline.com/commentary/magna-carta-then-and-now (archived at https://perma.cc/5UHJ-GJBS). It may also be obtained from SelectedWorks at http://works.bepress.com/jacklee/58/ and the Social Sciences Research Network at http://ssrn.com/abstract=2693161.</p
Searching for physics beyond the Standard Model through the dipole interaction
The magnetic dipole interaction played a central role in the development of
QED, and continued in that role for the Standard Model. The muon anomalous
magnetic moment has served as a benchmark for models of new physics, and the
present experimental value is larger than the standard-model value by more than
three standard deviations. The electric dipole moment (EDM) violates parity
({}) and time-reversal ({}) symmetries, and in the context of the
theorem, the combination of charge conjugation and parity (). Since a new
source of {} violation outside of that observed in the and meson
systems is needed to help explain the baryon asymmetry of the universe,
searches for EDMs are being carried out worldwide on a number of systems. The
standard-model value of the EDM is immeasurably small, so any evidence for an
EDM would signify the observation of new physics. Unique opportunities exist
for EDM searches using polarized proton, deuteron or muon beams in storage
rings. This talk will provide an overview of the theory of dipole moments, and
the relevant experiments. The connection to the transition dipole moment that
could produce lepton flavor violating interactions such as is also mentioned.Comment: Invited Plenary talk at the 19th International Spin Physics
Symposium, Juelic
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Nanofluidic devices for rapid detection of virus particles.
Technologies that could quickly detect and identify virus particles would play a critical role in fighting bioterrorism and help to contain the rapid spread of disease. Of special interest is the ability to detect the presence and movement of virions without chemically modifying them by attaching molecular probes. This would be useful for rapid detection of pathogens in food or water supplies without the use of expensive chemical reagents. Such detection requires new devices to quickly screen for the presence of tiny pathogens. To develop such a device, we fabricated nanochannels to transport virus particles through ultrashort laser cavities and measured the lasing output as a sensor for virions. To understand this transduction mechanism, we also investigated light scattering from virions, both to determine the magnitude of the scattered signal and to use it to investigate the motion of virions
A Case of Primary Paraganglioma that Arose in the Pancreas: the Color Doppler Ultrasonography and Dynamic CT Features
Paragangliomas rarely originate from the pancreas and they are characterized on imaging studies as well-marginated, hypervascular masses with cystic areas. We herein report on a case report of pancreatic paraganglioma in a 57-year-old woman, which was confirmed on pathology. Color Doppler ultrasonography and dynamic CT demonstrated a well-demarcated, extremely hypervascular mass with prominent intratumoral vessels and early contrast filling of the draining veins from the mass. Endoscopic retrograde cholangiopancreatography showed that the main pancreatic duct was displaced and mildly dilated
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