6,038 research outputs found
On Electrical Equivalence of Aperture-Body and Transmission-Cavity Resonance Phenomena in Subwavelength Conducting Aperture Systems from an Equivalent Circuit Point of View
For a narrow slit structure backed by a conducting strip which is taken as a
representative example of an aperture-body resonance (ABR) problem, the
transmission resonance condition (i.e., condition for maximum power
transmission) and the transmission width (i.e., normalized maximum transmitted
power through the slit) are found to be the same as those for narrow slit
coupling problem in a thick conducting screen, which is designated as a
transmission-cavity resonance (TCR) problem. From a viewpoint of equivalent
circuit representation for the transmission resonance condition and the
funneling mechanism, the ABR and the TCR problems are thought to be essentially
of the same nature.Comment: 14 pages, 3 figure
An emergent geometric description for a topological phase transition in the Kitaev superconductor model
Resorting to Wilsonian renormalization group (RG) transformations, we propose
an emergent geometric description for a topological phase transition in the
Kitaev superconductor model. An effective field theory consists of an emergent
bulk action with an extra dimension, an ultraviolet (UV) boundary condition for
an initial value of a coupling function, and an infrared (IR) effective action
with a fully renormalized coupling function. The bulk action describes the
evolution of the coupling function along the direction of the extra dimension,
where the extra dimension is identified with an RG scale and the resulting
equation of motion is nothing but a function. In particular, the IR
effective field theory turns out to be consistent with a Callan-Symanzik
equation which takes into account both the bulk and IR boundary contributions.
This derived Callan-Symanzik equation gives rise to a metric structure. Based
on this emergent metric tensor, we uncover the equivalence of the entanglement
entropy between the emergent geometric description and the quantum field theory
in the vicinity of the quantum critical point.Comment: Two figures adde
Effects of acute hypoxia on gene expression and physiology in Atlantic cod (Gadus morhua) after chronic dietary exposure to an organophosphate pesticide
Masteroppgave i biovitenskap og akvakultur - Nord universitet 202
Yttrium-90 Selective Internal Radiation Therapy with Glass Microspheres for Hepatocellular Carcinoma: Current and Updated Literature Review.
Hepatocellular carcinoma is the most common primary liver cancer and it represents the majority of cancer-related deaths in the world. More than 70% of patients present at an advanced stage, beyond potentially curative options. Ytrrium-90 selective internal radiation therapy (Y90-SIRT) with glass microspheres is rapidly gaining acceptance as a potential therapy for intermediate and advanced stage primary hepatocellular carcinoma and liver metastases. The technique involves delivery of Y90 infused glass microspheres via the hepatic arterial blood flow to the appropriate tumor. The liver tumor receives a highly concentrated radiation dose while sparing the healthy liver parenchyma due to its preferential blood supply from portal venous blood. There are two commercially available devices: TheraSphere® and SIR-Spheres®. Although, Y90-SIRT with glass microspheres improves median survival in patients with intermediate and advanced hepatocellular carcinoma and has the potential to downstage hepatocellular carcinoma so that the selected candidates meet the transplantable criteria, it has not gained widespread acceptance due to the lack of large randomized controlled trials. Currently, there are various clinical trials investigating the use of Y90-SIRT with glass microspheres for treatment of hepatocellular carcinoma and the outcomes of these trials may result in the incorporation of Y90-SIRT with glass microspheres into the treatment guidelines as a standard therapy option for patients with intermediate and advanced stage hepatocellular carcinoma
A Faddeev-Niemi Solution that Does Not Satisfy Gauss' Law
Faddeev and Niemi have proposed a reformulation of SU(2) Yang-Mills theory in
terms of a U(1) gauge theory with 8 off-shell degrees of freedom. We present a
solution to Faddeev and Niemi's formulation which does not solve the SU(2)
Yang-Mills Gauss constraints. This demonstrates that the proposed reformulation
is inequivalent to Yang-Mills, but instead describes Yang-Mills coupled to a
particular choice of external charge.Comment: 10 pages, no figure
Analysis of the effect of initial conditions on the initial development of a turbulent jet
The effect of the initial condition at the jet exit on the downstream evolution, particularly within the potential core length, were numerically investigated as well as with available experimental data. In order to select the most dependable computational model for the present numerical experiment, a comparative study has been performed with different turbulence models at k-epsilon level, and it was found that the k-epsilon-gammma model yields superior prediction accuracy over other conventional models. The calculated results show that the potential core length and the spreading rate the initial mixing layer are dependent on the initial length scale as well as the turbulent kinetic energy at the jet exit. Such effect of the initial length scale increases with higher initial turbulence level. An empirical parameter has been devised to collapse the calculated data of the potential core length and the spreading rate with various initial conditions onto a single curve
- …