Activation energy of diffusion determined from a single in-situ neutron reflectometry experiment

We present a new method for the determination of self-diffusivities in solids and the corresponding activation energy of diffusion using in-situ Neutron Reflectometry. In contrast to the classical ex-situ approach based on a sequence of isothermal measurements at different temperatures, the in-situ method allows one to work with a single experiment based on ramping the temperature with a constant rate. Our experiment demonstrates the success of the method for the model system of amorphous germanium. The activation energy of 2.2 eV and the absolute values of diffusivities achieved by the new method are in good agreement with the results of the classical approach, while a significantly lower amount of experimental time and samples are necessary. The presented method allows for an all-in-one type of experiment which can provide clearer and quicker results than similar methods using isothermal annealing procedures

Longing : Fox-Trot Song

https://digitalcommons.library.umaine.edu/mmb-vp/2023/thumbnail.jp

Volume expansion of amorphous silicon electrodes during potentiostatic lithiation of Li-ion batteries

Large volume modifications during electrochemical cycling of electrodes in Li-ion batteries often limit successful applications due to stress formation, electrode fracture and delamination from the current collector. In this study, we carried out investigations on the volume changes taking place during potentiostatic lithiation of the high capacity electrode material amorphous silicon. Thin film electrodes were investigated at potentials of 0.45, 0.28, 0.19 und 0.06 V vs Li/Li+ during lithiation using in-operando neutron reflectometry. We found a strongly non-linear correlation between volume and state-of-charge for each potential applied in strong contrast to the results of galvanostatic lithiation. A possible explanation might be that for high current densities occurring at the beginning of each potentiostatic lithiation step free volumes are created in the electrode material leading to disproportionate volume expansion

Mother\u27s Love

Illustration of woman looking at moon by pondhttps://scholarsjunction.msstate.edu/cht-sheet-music/6278/thumbnail.jp

Dreamy Carolina Moon

Illustration of houses with field and large moon in backgroundhttps://scholarsjunction.msstate.edu/cht-sheet-music/12463/thumbnail.jp

How should the protection of privacy, threatened by new technologies like radio frequency identification (RFID), be seen from a Judeo-Christian perspective?

Radio Frequency Identification (RFID) is a new technology which allows people to identify objects automatically but there is a suspicion that, if people are tracked, their privacy may be infringed. This raises questions about how far this technology is acceptable and how privacy should be protected. It is also initiated a discussion involving a wide range of technical, philosophical, political, social, cultural, and economical aspects. There is also a need to consider the ethical and theological perspectives. This dissertation takes all its relevant directions from a Judeo-Christian theological perspective. On one side the use of technology is considered, and on the other side the value of privacy, its infringements and protection are investigated. According to Jewish and Christian understanding human dignity has to be respected including the right to privacy. As a consequence of this RFID may only used for applications that do not infringe this right. This conclusion, however, is not limited to RFID; it will be relevant for other, future surveillance technologies as well.Philosophy and Systematic TheologyM. Th. (Theological ethics

The Serine/threonine kinase Stk33 exhibits autophosphorylation and phosphorylates the intermediate filament protein Vimentin

<p>Abstract</p> <p>Background</p> <p>Colocalization of Stk33 with vimentin by double immunofluorescence in certain cells indicated that vimentin might be a target for phosphorylation by the novel kinase Stk33. We therefore tested <it>in vitro </it>the ability of Stk33 to phosphorylate recombinant full length vimentin and amino-terminal truncated versions thereof. In order to prove that Stk33 and vimentin are also <it>in vivo </it>associated proteins co-immunoprecipitation experiments were carried out. For testing the enzymatic activity of immunoprecipitated Stk33 we incubated precipitated Stk33 with recombinant vimentin proteins. To investigate whether Stk33 binds directly to vimentin, an <it>in vitro </it>co-sedimentation assay was performed.</p> <p>Results</p> <p>The results of the kinase assays demonstrate that Stk33 is able to specifically phosphorylate the non-α-helical amino-terminal domain of vimentin <it>in vitro</it>. Furthermore, co-immunoprecipitation experiments employing cultured cell extracts indicate that Stk33 and vimentin are associated <it>in vivo</it>. Immunoprecipitated Stk33 has enzymatic activity as shown by successful phosphorylation of recombinant vimentin proteins. The results of the co-sedimentation assay suggest that vimentin binds directly to Stk33 and that no additional protein mediates the association.</p> <p>Conclusion</p> <p>We hypothesize that Stk33 is involved in the <it>in vivo </it>dynamics of the intermediate filament cytoskeleton by phosphorylating vimentin.</p

Local and Global Trend Bayesian Exponential Smoothing Models

This paper describes a family of seasonal and non-seasonal time series models that can be viewed as generalisations of additive and multiplicative exponential smoothing models. Their development is motivated by fast-growing, volatile time series, and facilitated by state-of-the-art Bayesian fitting techniques. When applied to the M3 competition data set, they outperform the best algorithms in the competition as well as other benchmarks, thus achieving to the best of our knowledge the best results of univariate methods on this dataset in the literature