We demonstrate that near-edge X-ray-absorption fine-structure spectra combined with full-field transmission X-ray microscopy can be used to study the electronic structure of graphite flakes consisting of a few graphene layers. The flake was produced by exfoliation using sodium cholate and then isolated by means of density-gradient ultracentrifugation. An image sequence around the carbon K-edge,...

Archaeologists are increasingly in need of quantitative measures of stone artefact retouch. Existing techniques fail to provide a generic measure of retouching for all chipped stone artefacts. A fast and reliable index is proposed which measures retouch in terms of the invasiveness of flake scars on the surfaces of complete stone artefacts. Unlike other measures, the index of invasiveness is we...

Predicting original flake mass is a major goal of lithic analysis. allows for researchers to make estimations remaining mass, lost and other features. All these measures relate the organization technology by past societies. The present work tests three different models predict log mass: multiple linear regression, random forest artificial neural networks (ANN). Estimations were performed using ...

Abundant novel physical properties have been observed in thin-flake samples of two-dimensional correlated electronic systems prepared by mechanical exfoliation. Developing new methods preparing bulk can further understand the low-dimensional system combining traditional characterization like X-ray diffraction, magnetic susceptibility and specific heat measurements. It is possible to maintain st...

Charge Transport in Organic Field-Effect Transistors In article number 2101701, Lukas Renn, Thomas Weitz, and co-workers develop organic transistor devices consisting of a monolayer-thin perylene-diimide n-type semiconductor on rectangular shaped h-BN flake. For some the semiconducting film is encapsulated between layers by stamping an additional flake top. transport measurements show signs int...

I 2001  U S Immigration and Naturalization Service ordered Rosario Hernandez of Garland, Texas, deported to his native Mexico. Hernandez, a 39-year-old construction worker, had immigrated to Texas from Guadalajara, Mexico, when he was a teenager. His removal was ordered on grounds that he had been convicted three times for driving while intoxicated—twice nearly twenty years ago an...

Two types of graphene oxide fibers are spun from high concentration aqueous dopes. Fibers extruded from large flake graphene oxide dope without drawing show unconventional 100% knot efficiency. Fibers spun from small sized graphene oxide dope with stable and continuous drawing yield in good intrinsic alignment with a record high tensile modulus of 47 GPa.

Background Biomineralization, e.g., in sea urchins or mollusks, includes the assembly of mesoscopic superstructures from inorganic crystalline components and biopolymers. The resulting mesocrystals inspire biophysicists and material scientists alike, because of their extraordinary physical properties. Current efforts to replicate mesocrystal synthesis in vitro require understanding the principl...

By subjecting amorphous flower-like TiO2 to a facile hydrothermal synthesis in the presence of Sr(2+), garden-like perovskite SrTiO3 superstructures were achieved. The amorphous TiO2 was preformed using ZnO flowers as templates. Different three-dimensional SrTiO3 architectures were coexisted in the garden, including SrTiO3 flowers composed of several hollow sword-shaped petals, many sheet-shape...