Resonant Scattering of Surface Plasmon Polaritons by Dressed Quantum Dots

The resonant scattering of surface plasmon-polariton waves by embedded semiconductor quantum dots above the dielectric/metal interface is explored in the strong-coupling regime. In contrast to non-resonant scattering by a localized dielectric surface defect, a strong resonant peak in the scattering field spectrum is predicted and accompanied by two side valleys. The peak height depends nonlinearly on the amplitude of surface plasmon-polariton waves, reflecting the feedback dynamics from a photon-dressed electron-hole plasma inside the quantum dots. This unique behavior in the scattering field peak strength is correlated with the occurrence of a resonant dip in the absorption spectrum of surface plasmon-polariton waves due to interband photon-dressing effect. Our result on the scattering of surface plasmon-polariton waves may be experimentally observable and applied to spatially selective illumination and imaging of individual molecules.Comment: 15 pages, 3 figure

Controlling quantum-dot light absorption and emission by a surface-plasmon field

The possibility for controlling the probe-field optical gain and absorption switching and photon conversion by a surface-plasmon-polariton near field is explored for a quantum dot above the surface of a metal. In contrast to the linear response in the weak-coupling regime, the calculated spectra show an induced optical gain and a triply-split spontaneous emission peak resulting from the interference between the surface-plasmon field and the probe or self-emitted light field in such a strongly-coupled nonlinear system. Our result on the control of the mediated photon-photon interaction, very similar to the `gate' control in an optical transistor, may be experimentally observable and applied to ultra-fast intrachip/interchip optical interconnects, improvement in the performance of fiber-optic communication networks and developments of optical digital computers and quantum communications.Comment: 7 pages, 15 figure

GRAND CHALLENGE No. 3: DIGITAL ARCHAEOLOGY Technology-Enabled Learning in Archaeology

Archaeology is traditionally a hands-on, in-person discipline when it comes to formal and informal instruction; however, more and more we are seeing the application of blended and online instruction and outreach implemented within our discipline. To this point, much of the movement in this direction has been related to a greater administrative emphasis on filling university classrooms, as well as the increasing importance of public outreach and engagement when it comes to presenting our research. More recently, we have all had to adjust our activities and interactions in reaction to physical distancing requirements during a pandemic. Whether in a physical classroom or online, archaeologists must learn to properly leverage digital technology in order to create enthusiastic, engaging, respectful, and accessible (from-place and in-place) learning environments. This article brings together scholars who are learning to do just that. We apply a usable and easily navigated framework for archaeologists to consider while in either formal or informal educational environments and provide examples of how digital technologies can be applied to satisfy the three “presences”—social/emotional, teaching, and cognitive—required for a successful “community of inquiry” experience in archaeology. Examples are drawn from our personal experiences in North America, Central America, and Europe

Open-front Systems

Dave Serfling and his family live in Preston, Minnesota, which is just north across the border from Decorah. Dave graduated from ISU in 1981 in farm operations. Serflings have a 50 sow farrow-to-finish operation and 80 cows they feed out. They also have sheep, and they own about 350 acres. They love Iowa so much, Dave\u27s wife even works in Iowa, so thanks for helping the economy. (laughter) Steve Williams and his wife live in Villisca, in Page County. Steve is a 1988 ISU business graduate. He has a total livestock operation with beef and a farrow-tofeeder pig operation. He feeds out a few. There are some interesting family ties and partnerships in Page County, and now his operation\u27s up to about 300 sows in a very productive and unique arrangement, which we\u27ll hear more about. Greg Vogel represents the ISU AG 450 Farm, which is located southwest of Ames , about a mile. This is actually a student-managed farm, and many of you are familiar with that concept that the students really manage it, for better or for worse. And they suffer all the advantages and perils of pure agriculture. Greg is the farm operator. He\u27s also an ISU grad (ag business, 1978) and finished a master\u27s in ag business in 1994. The farm is about 950 acres, and they have 200 sows out there. They run both outdoor and confmement operations. Last we\u27ll hear from my good friend, Dick Thompson. Dick and Sharon, of course, farm in Boone County. Dick and Sharon recently were recognized as the 1996 Farm Agricultural Leaders of The Year by the Des Moines Register, which was a tremendous honor for them. There farm is a little under 400 acres, they have been the driving force behind and the inspiration behind Practical Farmers of Iowa. Dick and Sharon have served as mentors for many, many farm families, not only in Iowa but nationwide. I know Dick and Sharon now have a cow-calf operation, and with their son, Rex, they have some of the facilities we\u27re talking about today, and they\u27re trying some new things in agriculture, so we\u27re pleased to have Dick here

A new device for minimally invasive mechano-chemical method of saphenous vein ablation. Report of 12 months of follow up

Introduction. The purpose of the study was to assess the effectiveness of endovascular mechanochemicalablation of the Great Saphenous vein and the Small Saphenous vein (GSV/SSV) using the use of Flebogrif®catheter and method, based on results obtained from the analysis of 200 patients. Material and methods. 200 patients underwent mechanochemical ablation using the Flebogrif® technique,of the 200 patients, 172 patients experienced insufficiency of the GSV and 28 experienced insufficiencies ofthe SSV. Follow-up assessment was established by outpatient appointments at 1, 3, 6, and 12 months postoperatively.During each subsequent visit, the result of the procedure was evaluated with the use of ultrasound.Furthermore, the intensity of clinical manifestations was assessed with the use of VCSS, CEAP, VASP scales. Anycomplications were also noted. Results. During 12-month follow-up the number of participants decreased to 168 (152 female, 16 male).Complete closure of the vein was achieved in 154 patients (140 female, 14 male). According to adoptedcriteria, 15 cases of recanalization were detected (10 complete and 5 partial). Based on the obtained resultsthe effectiveness of the method was assessed at 92%. Conclusions. The statistical analysis of the 12-month follow-up data allowed us to conclude the following theprocedural method had 92% of effectiveness at 12-month follow-up, vein diameter was not a significant limitationfor the application of the technique, there was a low rate of serious complications, and adverse cosmetic effectwas minimal. However , the method requires further long-term follow-up to allow for a complete assessment

Serum microtubule associated protein tau and myelin basic protein as the potential markers of brain ischaemia-reperfusion injury in patients undergoing carotid endarterectomy

Introduction. In the prevention of ischaemic stroke the recommended surgical procedure is carotid endarterectomy (CEA). However, surgical treatment of atherosclerotic stenosis may cause neurological complications. The aim of the study was to investigate consequential brain ischaemia-reperfusion injury by measuring the cerebral specific markers, the microtubule associated protein tau (MAPt) and myelin basic protein (MBP) in the serum of patients that underwent CEA. Material and methods. This study involved 25 participants who underwent CEA due to internal carotid artery stenosis. Blood samples were taken from each patient at three different intervals; within 24 hours prior to surgery, 12 hours after the surgery, and 48 hours after the surgery. Serum MAPt and MBP levels were measured by a commercially available enzyme-linked immunosorbent assay (ELISA). Results. The study showed that serum MAPt and MBP levels were statistically significantly decreased 12 hours after CEA compared to the level before the surgery (p < 0.05), but MAPt and MBP levels were normalized 48 hours after CEA. There was statistically significant correlation in serum MAPt levels with the velocity of blood flow in the internal carotid artery 12 and 48 hours after CEA (p < 0.05). Conclusions. Data from our study showed that CEA affects serum neuromarkers levels, such as MAPt and MBP, in patients with significant internal carotid artery stenosis. MAPt and MBP levels showed characteristic time curve in patients who underwent CEA and did not experience any neurological deficit in perioperative period. Possible alterations of this time curve may potentially be an index of a neurological event occurrence.  Introduction. In the prevention of ischaemic stroke the recommended surgical procedure is carotid endarterectomy (CEA). However, surgical treatment of atherosclerotic stenosis may cause neurological complications. The aim of the study was to investigate consequential brain ischaemia-reperfusion injury by measuring the cerebral specific markers, the microtubule associated protein tau (MAPt) and myelin basic protein (MBP) in the serum of patients that underwent CEA. Material and methods. This study involved 25 participants who underwent CEA due to internal carotid artery stenosis. Blood samples were taken from each patient at three different intervals; within 24 hours prior to surgery, 12 hours after the surgery, and 48 hours after the surgery. Serum MAPt and MBP levels were measured by a commercially available enzyme-linked immunosorbent assay (ELISA). Results. The study showed that serum MAPt and MBP levels were statistically significantly decreased 12 hours after CEA compared to the level before the surgery (p < 0.05), but MAPt and MBP levels were normalized 48 hours after CEA. There was statistically significant correlation in serum MAPt levels with the velocity of blood flow in the internal carotid artery 12 and 48 hours after CEA (p < 0.05). Conclusions. Data from our study showed that CEA affects serum neuromarkers levels, such as MAPt and MBP, in patients with significant internal carotid artery stenosis. MAPt and MBP levels showed characteristic time curve in patients who underwent CEA and did not experience any neurological deficit in perioperative period. Possible alterations of this time curve may potentially be an index of a neurological event occurrence.

The Grizzly, January 30, 2014

Sexual Misconduct Numbers in Security Report Explained • Live Feed From Ritter Stirs Debate • Colleges Soon to Consider the Impact of MOOCs • Non-Traditional Careers for Psychology Majors • School Spirit on the Rise • First Salinger Read-a-Thon Brings Holden Back to Ursinus Campus • Culture Shock: Returning to UC • Opinion: Drug Policy\u27s Punishments are Too Harsh; Netflix Streaming is Hogging our Resources • As Olympics Near, Controversy Grows • Super Bowl: Fierce Competition, Big Personalities • Winter Recap: Wrestling, Women\u27s Swimming Shinehttps://digitalcommons.ursinus.edu/grizzlynews/1895/thumbnail.jp

The Grizzly, April 24, 2014

Ursinus Conducts First Ever ISGP Conference on Pandemic Preparedness • Library Staff Planning for Big Changes • First Schellhase Ursinus Essay Prize Announced on CoSa Day • Annual Charity Art Fair to Support Camp Cranium • Political Activists to Speak at Graduation • Senior Fellows Help to Shape the Incoming Freshman Class • Alumni Weekend to be Held on Campus • Opinion: Parents Influence our Political Beliefs; Fight to Preserve Net Neutrality in the US • Balancing Act for the Ages: Senior Bryn O\u27Neill • Opinion: MLB Must Move on From Steroid Era • Men\u27s Lacrosse Stays Alive, Baseball Splits with JHUhttps://digitalcommons.ursinus.edu/grizzlynews/1905/thumbnail.jp