UV Degradation of the Optical Properties of Acrylic for Neutrino and Dark Matter Experiments

UV-transmitting (UVT) acrylic is a commonly used light-propagating material in neutrino and dark matter detectors as it has low intrinsic radioactivity and exhibits low absorption in the detectors' light producing regions, from 350 nm to 500 nm. Degradation of optical transmittance in this region lowers light yields in the detector, which can affect energy reconstruction, resolution, and experimental sensitivities. We examine transmittance loss as a result of short- and long-term UV exposure for a variety of UVT acrylic samples from a number of acrylic manufacturers. Significant degradation peaking at 343 nm was observed in some UVT acrylics with as little as three hours of direct sunlight, while others exhibited softer degradation peaking at 310 nm over many days of exposure to sunlight. Based on their measured degradation results, safe time limits for indoor and outdoor UV exposure of UVT acrylic are formulated.Comment: 13 pages, 6 figures, 3 tables; To be submitted to Journal of Instrumentatio

Skiva som stabiliserande element på glespanel.

Målsättningen med detta examensarbete har varit att studera skivverkan och ta fram brottlasten för en innertaks konstruktion. Takkonstruktionen som studerats bestod av gipsskivor på glespanelstomme som i sin tur spikats på en regelstomme. Arbetet har utförts dels som praktiska försök i Väg och Vattensektionens labbhall på LTH och dels som teoretiska beräkningar med hjälp av ett finitelementprogram

Hydro­thermally synthesized α-Ba2P2O7

Single crystals of α-Ba2P2O7, dibarium diphosphate, were obtained under hydro­thermal conditions. The structure belongs to the diphosphate A 2P2O7 series with A being an alkaline earth cation. α-Ba2P2O7 crystallizes isotypically with α-Sr2P2O7. All atomic sites have site symmetry m with the exception of two O atoms which reside on general positions. Both Ba2+ cations are coordinated by nine terminal O atoms from eclipsed diphosphate P2O7 anions to form a three-dimensional network throughout the structure

COVID-19’s Second Wave: How are teachers faring with the return to physical schools?

"Part two of the results of a national teacher survey on resilience andburnout during the coronavirus pandemic."https://edcan.atavist.com/teacher-covid-survey-

Individual- and community-level correlates of cigarette-smoking trajectories from age 13 to 32 in a U.S. population-based sample

Characterizing smoking behavior is important for informing etiologic models and targeting prevention efforts. This study explored the effects of both individual- and community-level variables in predicting cigarette use vs. non-use and level of use among adolescents as they transition into adulthood

The impact of multiplex genetic testing on disease risk perceptions

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/110591/1/cge12403.pd

A moral intervention reduces doping likelihood in British and Greek athletes: evidence from a cluster randomized control trial

Objectives: The authors aimed to develop a moral intervention and to determine whether it was more effective in preventing doping than an educational (i.e., knowledge-based) intervention; their primary outcome was doping likelihood, and the secondary outcomes were moral identity, moral disengagement, moral atmosphere, and anticipated guilt. Methods: Eligible athletes (N = 303) in the United Kingdom and Greece took part in the study. The authors randomly assigned 33 clubs to either the moral or the educational intervention. They measured outcomes pre- and postintervention and at 3- and 6-month follow-up. Results: Athletes in both interventions in both countries reported lower doping likelihood and moral disengagement and higher guilt from pre- to postintervention. These effects were maintained at the 3- and 6-month follow-ups. There were no effects on moral identity or moral atmosphere. Conclusions: In addition to disseminating information about doping, doping prevention programs should include content that focuses on moral variables

Fibrinolysis in a lipid environment: modulation through release of free fatty acids

Background: Thrombolysis is conventionally regarded as dissolution of the fibrin matrix of thrombi by plasmin, but the structure of clots in vivo includes additional constituents (proteins, phospholipids) that modulate their solubilization. Objective: We examined the presence of free fatty acids in thrombi and their effects on distinct stages of fibrinolysis (plasminogen activation, plasmin activity). Methods and Results: Using the fluorescent probe acrylodated intestinal fatty acid-binding protein, variable quantities (up to millimolar concentrations) of free fatty acids were demonstrated in surgically removed human thrombi. Oleic acid at relevant concentrations reversibly inhibits more than 90% of the amidolytic activity of plasmin on a synthetic substrate (Spectrozyme PL), but only partially inhibits its fibrinolytic activity measured using turbidimetry. Chromogenic assays detecting the generated plasmin activity show that plasminogen activation by tissue-type plasminogen activator (t-PA) is completely blocked by oleic acid in the fluid phase, but is accelerated on a fibrin matrix. A recombinant derivative of t-PA (reteplase) develops higher fibrin specificity in the presence of oleic acid, because both the inhibition of plasminogen activation in free solution and its enhancement on fibrin template are stronger than with wild-type t-PA. Conclusion: Through the stimulation of plasminogen activation on a fibrin template and the inhibition of plasminogen activators and plasmin in the fluid phase, free fatty acids confine the action of fibrinolytic proteases to the site of clotting, where they partially oppose the thrombolytic barrier function of phospholipids