Local control of improper ferroelectric domains in YMnO3_3

Improper ferroelectrics are described by two order parameters: a primary one, driving a transition to long-range distortive, magnetic or otherwise non-electric order, and the electric polarization, which is induced by the primary order parameter as a secondary, complementary effect. Using low-temperature scanning probe microscopy, we show that improper ferroelectric domains in YMnO$_3$ can be locally switched by electric field poling. However, subsequent temperature changes restore the as-grown domain structure as determined by the primary lattice distortion. The backswitching is explained by uncompensated bound charges occuring at the newly written domain walls due to the lack of mobile screening charges at low temperature. Thus, the polarization of improper ferroelectrics is in many ways subject to the same electrostatics as in their proper counterparts, yet complemented by additional functionalities arising from the primary order parameter. Tailoring the complex interplay between primary order parameter, polarization, and electrostatics is therefore likely to result in novel functionalities specific to improper ferroelectrics

The Grizzly, November 10, 1989

Wismer Staff Pleads Innocence: Verdict? • Museum Safe and Sound • Dinner for Visitors • Letters: Get to the Point!; GDI Tired of Greek Rights at U.C.; Pro-Life Prof Speaks for Babies • U.C.\u27s Very Vibrant Voices • Opinion: Global Warming • Promoting Condom Sensehttps://digitalcommons.ursinus.edu/grizzlynews/1246/thumbnail.jp

Multiple Peer Group Self-identification and Adolescent Tobacco Use

Associations between peer group self-identification and smoking were examined among 2,698 ethnically diverse middle school students in Los Angeles who self-identified with groups such as Rockers, Skaters, and Gamers. The sample was 47.1% male, 54.7% Latino, 25.4% Asian, 10.8% White, 9.1% Other ethnicity, and 59.3% children of immigrant parents. Multiple group self identification was common: 84% identified with two or more groups and 65% identified with three or more groups. Logistic regression analyses indicated that as students endorsed more high risk groups, the greater their risk of tobacco use. A classification tree analysis identified risk groups based on interactions among ethnicity, gender, and group self-identification. Psychographic targeting based on group self-identification could be useful to design more relevant smoking prevention messages for adolescents who identify with high-risk peer groups

Sex-associated effect of CETP and LPL polymorphisms on postprandial lipids in familial hypercholesterolaemia

Background: This study assessed the gender-specific influence of the cholesteryl ester transfer protein (TaqIB, I405V) and lipoprotein lipase (S447X) polymorphisms on the response to an oral fat tolerance test in heterozygotes for familial hypercholesterolaemia.Methods: We selected and genotyped 80 men and postmenopausal women heterozygous for familial hypercholesterolaemia (main group) as well as 11 healthy control subjects. Patients were subgrouped based on their response to oral fat tolerance test. The oral fat tolerance test was defined as pathological when postprandial triglyceride concentration was higher than the highest triglyceride concentration observed in healthy subjects (220 mg/dl) at any time (2, 4, 6 or 8 h).Results: In the pathological subgroup, men had significantly higher incremental area under the curve after oral fat tolerance test than postmenopausal women. Furthermore, multivariate analysis revealed a gender association of TaqIB and I405V influence on postprandial lipaemia in this subgroup.Conclusion: In conclusion, it seems that gender and TaqIB polymorphism of the cholesteryl ester transfer protein gene were both associated with the distribution of triglyceride values after oral fat tolerance test, only in subjects with a pathological response to oral fat tolerance test. Specifically, men carrying the B2 allele of the TaqIB polymorphism showed a higher postprandial triglyceride peak and a delayed return to basal values compared with women carrying B2. However, further investigations in larger populations are required to replicate and confirm these findings

The Grizzly, September 22, 1989

Kane Claiming Greeks Shall Survive • Olin Noise Annoys All • Letters: Boot Booze Begs Senior; Rovers Rotten • DiFeliciantonio: A Mouthful • McNulty Directs Residents • Surprise, surprise! UC Stomps Swarthmore • Ursinus Closes Gap with F&M Diplomats • Commentary; Why Bush War Can\u27t be Won; HPER Lab a Strong Addition • Intramurals: Full Steam Ahead! • One Giant Step • Sports Summary • Pledging: End of an Era? • BWC Causes Electrical Overloadhttps://digitalcommons.ursinus.edu/grizzlynews/1241/thumbnail.jp

The Grizzly, September 15, 1989

Greek Golden Age Growing Dark • U.C. Slasher Case Finally Closed • Letters: Physics Major Majorly Miffed; Wismer Eggs on Disgusted Diner • SAO Makes Room for Zimmer • Go Abroad: It\u27s Worth It • Mann\u27s Soda Can Hit with Crowd • Bears Upset Hoyas in Season Opener • Grizzlies Take Tourney with Defense • V-ball: Victors! • Endurance is Key • Athletes of the Week • Pledging: Git! • Myrin Booking • Lucas Heads Frosh Seminar • Dumas: Cook of Monte Cristo • Smith Donation • Freshmen Make Necessary Adjustmentshttps://digitalcommons.ursinus.edu/grizzlynews/1240/thumbnail.jp

The Grizzly, May 2, 1989

Greeks Grab Spotlight • Grad. Speakers Tapped • Benedict No.1 • Letter: Racism! Not Just Rednecks • Williams\u27 Farewell • Richter Honored • ISIC\u27s for Going Abroad • The Arena: Seeking Opinions • Trenton Draws First Blood • U.C. Hits Stumbling Block • Positive for MAC\u27s • Crabs and Fries: The Spice of Life • Dance Marathon Coming • Senior Altruism Needed • Seniors\u27 Lasting Impressions: Your Most Memorable Moments at U.C.? • Final Exam Schedulehttps://digitalcommons.ursinus.edu/grizzlynews/1237/thumbnail.jp

Critical Spaces for Critical Times: Global Conversations in Literacy Research as an Open Professional Development and Practices Resource

This paper reflects an OER (Open Educational Resources) critical literacy project, Global Conversations in Literacy Research (GCLR), (www.globalconversationsinliteracy.wordpress.com), now in its fourth year. GCLR annually hosts seven web seminars presented by internationally recognized literacy and education scholars. We outline key dimensions of GCLR not only as an OER but as an open educational practice (OEP) (Andrade et al., 2011) that through its design, not only provides open access to scholarship, but also understands the critical nexus among resources, practices and theory. Informed by data from a longitudinal study, this paper situates these dimensions within professional development literature, and outlines GCLR as a critical space designed for critical times, and the importance of intentionality when accessing OER. Like scholars before us, we argue that that availability is not the only consideration when using OER (Andrade et al., 2011); OER must be considered in relation to pedagogical considerations and how OER are used as a critical component to online professional development

Case report: A complicated course of Collet-Sicard syndrome after internal carotid artery dissection and lenticulo-striatal artery infarction

A 40-year-old Caucasian man presented with sudden onset of left-sided hemiparesis associated with dysphonia, dysphagia, and right-sided weakness on shoulder elevation and head rotation. The clinical examination revealed deviation of the tongue to the right, absence of right-sided gag reflex, right-sided palatal and vocal cord paresis, and weakness of the right trapezius and sternocleidomastoid muscles; all were in addition to left-sided brachiocephalic-accentuated hemiparesis. The diagnostic examination revealed dissection of the right carotid artery with occlusion of the middle cerebral artery and infarction in the lenticular-striatal artery territory. Mechanical thrombectomy with stent angioplasty of the right internal carotid artery was performed. The paresis of the left side of the body completely regressed within a week after symptom onset, but the dysphonia, weakness of the right trapezius and sternocleidomastoid muscles, and especially dysphagia persisted and regressed slowly but gradually. The patient required percutaneous gastric tube feeding for the next 12 weeks, possibly because of involvement of subcortical white matter tracts. The constellation of symptoms and clinical findings were consistent with Collet-Sicard syndrome, an extremely rare disorder caused by direct compression of the caudal cranial nerves at the base of the skull

The Grizzly, March 17, 1989

Pledging Violations Abound: Change Imminent • Approaching Commencement Scares Seniors • Letters: Bermans Ship Garbage Here?; Alumni Concerned About Curtis Fire; Bond Facts Straight?; Collegeville Water Now Non-Toxic; Visser Vicous to Hocsters • CAB Earns Kudos • Bears Look to Bright Furture • Lady Bears Always A Bridesmaid • Track Stars Shine! • Easton\u27s Colonial Genuine Italian • Blues: A+ • Guess Who\u27s Coming for Dinner? • Senior Matters Leave Their Mark • Peruvian Junglehttps://digitalcommons.ursinus.edu/grizzlynews/1232/thumbnail.jp