The hindered internal rotations around the partial carbon-carbon double bond, nitrogen-carbon and carbon-carbon single bonds within the 2-(2-chloro-phenothiazine-l-yl)-3-(triphenylphosphoranylidene) butandioate has been experimentally studied by the dynamic H NMR spectroscopic in variable temperatures. The activation (∆H, ∆S, ∆G) and kinetic (kc, Ea) parameters have been calculated in a series ...

This paper presents an experimental investigation of bond-strengthening hooks as a new method to increase bond strength along flexural reinforcing bars in reinforced concrete (RC) beams. The proposed method attempts to increase confining stiffness around the flexural bars by placing U-shaped hooks and to prevent premature bond splitting failure. Ten specimens with different numbers and sizes of...

Bond graph models of an electrical transformer including the nonlinear saturation are presented. These models determine the relation between self and mutual inductances, and the leakage and magnetizing inductances of power transformers with two and three windings using the properties of a bond graph. The modelling and analysis using this methodology to three phase power transformers or transfor...

We have developed a novel oxidant-free direct cross-coupling reaction of 2,6-lutidine and internal alkynes leading to five-membered carbocyclic compounds mediated by nonmetallocene cationic hafnium alkyl complexes. Mechanistic studies of the coupling reaction showed that the reaction begins with C(sp(3))-H bond activation via σ-bond metathesis, after which the coordinatively unsaturated hafnium...

Bond vector construction. Our models are derived from the T=1 and T=3 crystal structures of BMV capsids by associating each twofold or quasi-twofold symmetry axis (the dimer interfaces) with the center of a spherical subunit. We then draw a ‘bond’ at each interface between neighboring subunits, resulting in Fig. 1a. We construct the subunit geometries such that each subunit has a ‘bond-vector’ ...

BACKGROUND Canonical serine protease inhibitors commonly bind to their targets through a rigid loop stabilised by an internal hydrogen bond network and disulfide bond(s). The smallest of these is sunflower trypsin inhibitor (SFTI-1), a potent and broad-range protease inhibitor. Recently, we re-engineered the contact β-sheet of SFTI-1 to produce a selective inhibitor of kallikrein-related peptid...

Strand substitution was evaluated for the core of OSB with chips produced by grinding of recycled particleboards and wood waste. All the boards manufactured under laboratory conditions having a share of small chips in the core had high mechanical parameters, thus meeting the requirements of the standard for OSB/3. No significant effect was found of the applied modification of the core on bendin...

Internal bond strength testing is a widely used approach for testing quality traits of wood based panels. Generally, failure of internal bond specimens is due to adhesion and/or wood failure in the specimen. It has been reported that a composite product with a large variation in the vertical density profile fails in the center part of the board which is either the middle of the core layer or th...

PURPOSE The aim of the present study was to record the metal-ceramic bond strength of a feldspathic dental porcelain and a Co-Cr alloy, using the Direct Metal Laser Sintering technique (DMLS) for the fabrication of metal substrates. MATERIALS AND METHODS Ten metal substrates were fabricated with powder of a dental Co-Cr alloy using DMLS technique (test group) in dimensions according to ISO 96...

We study semiflexible colloidal polymers assembled from di-patch particles via critical Casimir forces. By tuning the bond strength and resulting bending rigidity with temperature, we directly observe elastic relaxation internal friction effects.