In this paper, we discuss a simplified finite element method (FEM) simulation of surface acoustic wave (SAW) delay line hydrogen sensor using COMSOL Multiphysics. A delay line SAW sensor consists of a transmitting interdigital transducer (IDT) and a receiving IDT separated by a few wavelengths. In this paper, the number of degrees of freedom (DOF) to solve for the SAW delay line sensor model is...

Detailed studies have been conducted to determine the activity of palladium catalysts for the amination of five-membered heterocyclic halides and to determine the factors that control the scope of this reaction. Palladium-catalyzed aminations of the electron-rich furanyl, thiophenyl, and indolyl halides and of the related 2-halogenated thiazoles, benzimidazole, and benzoxazole have been shown t...

In typical catalytic organic transformations, transition metals in catalytically active complexes are present in their most stable valence states, such as palladium(0) and (II). However, some dimeric monovalent metal complexes can be stabilized by auxiliary ligands to form diamagnetic compounds with metal-metal bonding interactions. These diamagnetic compounds can act as catalysts while retaini...

Palladium-catalyzed homocoupling reaction of aryl boronic acids has been developed using a protocol similar to the well-documented crosscoupling reaction. -Halocarbonyl compounds are applied to initiate the reaction via oxidative addition to a palladium(0) species. The resulting palladium enolate halide can promote the double transmetallation. Reductive elimination generates the desire homocoup...

Chemical modification techniques are widely used in graphite furnace atomic absorption spectrometry (GFAAS). Palladium is a very effective chemical modifier and can be used to stabilize many elements to several hundred degrees higher than the temperatures possible with current methods [1-9]. Of the elements tested, the greatest temperature shifts are achieved for the semi-metallic elements such...

We report a route to benzosultams that exploits the palladium-catalysed aminsulfonylation of alkenyl iodides as initial step. An (Z)-configured iodide substrate is combined with DABSO, N,N-dialkylhydrazine nucleophile and palladium(0) catalyst achieve aminsulfonylation. A second palladium(0)-catalysed transformation, this time intramolecular, leads benzosultam formation. Good variation starting...

Sawadjoon, S. 2013. Palladium-Catalyzed Nucleophilic Substitution of Alcohols. Mechanistic Studies and Synthetic Applications. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1092. 63 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-8785-0. This thesis deals with the palladium-catalyzed nucleophilic substitution of π-activated alco...

Selected results of investigations focused on the changes to some mechanical properties palladium and several palladium-based alloys caused by exposure hydrogen have been collected presented. The findings indicate that pure are highly susceptible alteration upon hydrogen. In cases alloying with silver copper, alloys, as compared palladium, appear resist properties. case manganese, interesting o...

introduction: ablative and nonablative lasers have been used to treat melasma. we aimed to assess and compare the combining q-switched nd:yag laser (qsnyl) and fractional erbium:yag laser (feyl) with qsnyl alone in treatment of melasma. methods: this randomized controlled clinical trial was performed in our research center during 2013-2014. women with melasma and without a history of keloid for...

Organic light-emitting diodes (OLEDs) with a Ba-doped tris(8-quinolinolato)aluminum(III) (Alq3) layer were fabricated to reduce the barrier height for electron injection and to improve the electron conductivity. In the OLED consisting of glass/ITO/4,4',4"-tris[2-naphthylphenyl-1-phenylamino]triphenylamine (2-TNATA, 30 nm)/4,4'-bis[N-(1-napthyl)-N-phenyl-amino]-biphenyl (NPB, 18 nm)/Alq3 (42 nm)...