Dental impression is an important step in the preparation of prostheses since it provides the reproduction of anatomic and surface details of teeth and adjacent structures. The objective of this study was to evaluate the linear dimensional alterations in gypsum dies obtained with different elastomeric materials, using a resin coping impression technique with individual shells. A master cast mad...

The thermoacidophile and obligate elemental sulfur (S(8)(0))-reducing anaerobe Acidilobus sulfurireducens 18D70 does not associate with bulk solid-phase sulfur during S(8)(0)-dependent batch culture growth. Cyclic voltammetry indicated the production of hydrogen sulfide (H(2)S) as well as polysulfides after 1 day of batch growth of the organism at pH 3.0 and 81°C. The production of polysulfide ...

Many materials have been explored as potential hydrogen evolution reaction (HER) electrocatalysts to generate clean hydrogen fuel via water electrolysis, but none so far compete with the highly efficient and stable (but cost prohibitive) noble metals. Similarly, noble metals often excel as electrocatalytic counter electrode materials in regenerative liquid-junction photoelectrochemical solar ce...

This investigation elucidates the electrochemical reaction process occurring within lithium-sulfur battery cells in detail, which has been unclear even after a half century of study primarily due to the very high reactivity of the polysulfide species. The polysulfide intermediates were deactivated by organic conversion - benzylization, and LC/MS and NMR analyses were first applied. The results ...

A polymer-based mechanical low-pass filter(m-LPF) for high-g accelerometers makes it possible to remove high-frequency transient noises from acceleration signals, thus ensuring repeatable and reliable measurement on acceleration. We establish a prediction model performance of m-LPF by combining fundamental vibration with the fractional derivative standard linear solid(FD SLS) describing storage...

Sub-1 nm nanowires (SNWs) can not only be processed like polymers due to their polymer-analogue properties but also show multifunctions owing well-manipulated compositions and structures. Rationally designed engineered multicomponent heterostructure SNWs further enhance multifunction performance while it is very challenging achieve such at sub-nanoscale. Herein, we synthesized Bi2O3-polyoxometa...

The use of monolithic carbons with structural hierarchy and varying amounts of nitrogen and oxygen functionalities as sulfur host materials in high-loading lithium-sulfur cells is reported. The primary focus is on the strength of the polysulfide/carbon interaction with the goal of assessing the effect of (surface) dopant concentration on cathode performance. The adsorption capacity - which is a...

Recently cadmium selenide (CdSe) photoelectrodes attract­ ed interest concerning solar energy conversion because of their good stability and high efficiency. Investigations were per­ formed with CdSe single crystals [1, 2], sintered pellets [3], pastes [4, 5] as well as thin films, obtained by different meth­ ods, e.g. electrochemical deposition [6-8], spray pyrolysis [9], vacuum deposition [10...