2,731 research outputs found
Codebook and Raw Data for: Wacker, J. & Albrecht, M. Probing the association of a behavioral measure of optimistic bias with depressive symptoms and reward sensitivity
No full textCodebook and Raw Data for: Wacker, J. & Albrecht, M. Probing the association of a behavioral measure of optimistic bias with depressive symptoms and reward sensitivityunknow
J+S-Vermitteln: Störungen vorbeugen: J+S-Podcast
No full textSouverän unterrichten – auch wenn’s mal stört. Störungen gehören zum Training dazu – sie sind unvermeidlich, aber handhabbar. In dieser Episode spricht Tim Hartmann mit erfahrenen Fachpersonen darüber, wie man Störungen besser versteht und mit gezielter Vorbereitung, klaren Ritualen und Selbstreflexion vorbeugen kann. Mit dabei: Sarah Wacker (Dozentin an der PHTG, J+S-Expertin), Fabian Kopp (J+S Leiter), Barbara Schneckenburger und Lena Wälly (Kindergärtnerinnen), sowie Noah Mutzner (Schiedsrichter)
Der Kommandant der Lebensversicherungs-Truppen [Theodor Ab Yberg] : Kläber
No full textZu haben bei J. Pfister Lith. in ZürichBildüberschrift: "Sie schie[ss?]en wacker!!?
Left frontal anodal tDCS increases approach motivation depending on reward attributes
No full textOhmann HA, Kuper N, Wacker J. Left frontal anodal tDCS increases approach motivation depending on reward attributes. Neuropsychologia. 2018;119:417-423
On Existence and Uniqueness of Maximum Log-Likelihood Parameter Estimation for Two-Parameter Weibull Distributions
No full textOn Existence and Uniqueness of Maximum Log-Likelihood Parameter Estimation for Two-Parameter Weibull Distributions
No full textUnraveling the Wacker Oxidation Mechanisms
No full textThe mechanisms for the aqueous PdCl2 mediated olefin oxidation reaction (the Wacker process) have been studied with density functional theory, with special emphasis on determining competitive pathways that explain the product distribution's dependence on reaction conditions. Surprisingly, our results indicate that the previously suggested inner-sphere rate-determining step for this process is incompatible with the experimental observations. We describe three key steps, all with barriers between 22.7 and 23.3 kcal/mol. These results, together with literature experimental data, were used to construct a model that explains the observations in the Wacker process. We find that the rate-determining step under low [Cl^-] conditions is not hydroxypalladation as generally believed, but intermolecular isomerization after a lower-energy water-catalyzed internal nucleophilic attack. The pathway under high [Cl^-] leading to anti-addition aldehyde products is only accessible when CuCl_2 is available to selectively stabilize associative chloride exchange. The controversial switch in mechanisms is caused by both this selective stabilization from CuCl_2, and the prerequisite dissociation of Cl^- prior to internal attack. Finally, we suggest that the previously published rate expression for the Wacker process under high [Cl^-] is incomplete and should be replaced with a two-term expression, featuring one term first-order and one term second- (or higher) order in [CuCl_2]
Unraveling the Wacker Oxidation Mechanisms
No full textThe mechanisms for the aqueous PdCl2 mediated olefin oxidation reaction (the Wacker process) have been studied with density functional theory, with special emphasis on determining competitive pathways that explain the product distribution's dependence on reaction conditions. Surprisingly, our results indicate that the previously suggested inner-sphere rate-determining step for this process is incompatible with the experimental observations. We describe three key steps, all with barriers between 22.7 and 23.3 kcal/mol. These results, together with literature experimental data, were used to construct a model that explains the observations in the Wacker process. We find that the rate-determining step under low [Cl-] conditions is not hydroxypalladation as generally believed, but intermolecular isomerization after a lower-energy water-catalyzed internal nucleophilic attack. The pathway under high [Cl-] leading to anti-addition aldehyde products is only accessible when CuCl2 is available to selectively stabilize associative chloride exchange. The controversial switch in mechanisms is caused by both this selective stabilization from CuCl2, and the prerequisite dissociation of Cl- prior to internal attack. Finally, we suggest that the previously published rate expression for the Wacker process under high [Cl-] is incomplete and should be replaced with a two-term expression, featuring one term first-order and one term second- (or higher) order in [CuCl2]
Missile Injury by A Weed Wacker Resulting in a False Aneurysm of the Brachial Artery
No full textA novel now commonly used device in many countries called a “weed-wacker” is a mechanical rotating device with a cord used to trim lawns and grass. A case of a 14-year old boy with a false aneurysm of the brachial artery is presented; he sustained a missile injury by a piece of rusty steel projected by use of a weed wacker. Missile injuries by nail guns and bullets have been documented in the literature; however, this mechanism of injury by a weed-wacker has never been previously described and is presented as a unique mechanism of injury and brings attention the issue of safety with the use of the weed-wacker.</jats:p
Application of an additive structured copula regression on the joint wind speed and wind direction distribution
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