This paper describes the Virtual Prototype of a Dielectric Window (DW) for High Power Microwave Vacuum Tubes and Linear Accelerators (LINAC). Design formulas are provided and Computer Aided Design techniques based on COMSOL Multiphysics are proposed. The virtual prototype considers the Thermo-mechanical effects due to the joule effect induced by the power which crosses the DW and the Thermal co...

0026-2714/$ see front matter 2012 Elsevier Ltd. A http://dx.doi.org/10.1016/j.microrel.2012.06.025 ⇑ Corresponding author. Tel.: +41 567 1525; fax: +4 E-mail address: [email protected] (P. Pfäffli). Using TCAD tools, many reliability issues can be studied quantitatively. Examples are hot carrier degradation of interfaces, threshold voltage shifts during NBTI stress, radiation effects and so...

This paper investigates the morphology, thermal, and electrical properties of LDPE (low-density polyethylene)-based nanocomposites after thermal aging. The FTIR (Fourier transform infrared spectroscopy) spectra results show that thermo-oxidative reactions occur in neat LDPE and LDPE/SiO₂ nanocomposites when the aging time is 35 days and in LDPE/MgO nanocomposites when the aging time is 77 days....

A series of heteroleptic strontium complexes (1-9) using a combination of different aminoalkoxides and 2,2,6,6-tetramethyl-3,5-heptanedionate (tmhd) were prepared to examine the effect of the bulkiness and coordination ability of the aminoalkoxide ligand in these complexes as well as potential strontium precursors. All complexes were characterized by FT-IR, FT-NMR, elemental analyses, and therm...

The degradation of the epoxy system was studied for the prepared six blend samples with the incorporation of 0 wt% 25 wt% carboxyl terminated butadiene acrylonitrile (CTBN) copolymer, on a dynamic basis using Thermo gravimetric analysis (TGA) technique under a nitrogen atmosphere. The blends were prepared by physical mixing and were cured with diamine. The degradation of each sample followed se...

Perfluoropolyethers (PFPE) are a class of frequently used lubricants in space applications due to their high stability under demanding conditions. However, they susceptible aging, with the aging mechanism being dependent on specific material combination and storage condition. A Lewis-acid-induced thermo-catalytic degradation is concern, for example, steel-on-steel sliding contact, can be releva...

pH-Degradable PVA nanogels, which are prepared by photo-crosslinking thermo-preinduced PVA nanoaggregates in water without any surfactants or toxic organic solvents, are used for intracellular PTX release and anticancer treatment. These nanogels fast degraded at mildly acidic conditions with a pH-triggered PTX release, and the degradation products are only native PVA and poly(hydroxyethyl acryl...

A general framework for the thermodynamics of open systems is presented. The theory is fundamentally based on the generalized balance of mass, which is enhanced by additional surface-°ux and volume-source terms. The presentation highlights the in°uence of the enhanced mass balance on the remaining balance equations. To clarify the impact of the variable reference density, we introduce the notio...

Autologous chondrocyte implantation for cartilage repair represents a challenge because strongly limited by chondrocytes' poor expansion capacity in vitro. Mesenchymal stem cells (MSCs) can differentiate into chondrocytes, while mechanical loading has been proposed as alternative strategy to induce chondrogenesis excluding the use of exogenous factors. Moreover, MSC supporting material selectio...