in this study, friction stir spot welding (fssw) is applied to join the tial6v4 titanium alloy with 1.5 mm thickness and then the effect of rotational speed and tool dwell time on microstructure and mechanical properties is investigated. in this regard, the speed of the tool rotation was considered as 800, 1000, and 1200 rpm, as well as the tool dwell time was set at 7 and 12s. microstructural ...

We develop the theory of nuclear ring currents induced by external magnetic fields in torsional molecules. The is applied to toluene, whose torsion axis oriented along field. obtain magnetically diatropic and paratropic contributions current flowing classical nonclassical directions, respectively. In electronic rotational ground state strengths ring-current susceptibilities are $\ensuremath{-}1...

Rotablation (rotational atherectomy) is an acknowledged method of percutaneous treatment of highly calcified coronary artery lesions that cannot be treated with traditional angioplasty. The complexity of the technique and usage of very specific equipment can contribute to the development of uncommon complications. We present a case of percutaneous retrieval of a damaged rotational atherectomy b...

The insertions of metal-bound CH, into M-H and M 4 H 3 bonds have been proposed as the chain initiation and propagation steps, respectively, in the Fischer-Tropsch reductive polymerization of CO to form alkanes. As a model for this important elementary reaction, we have examined the properties and migratory insertion reactivity of a prototypical coordinatively saturated complex ClRuH(CH2) using...

– The fine structure of the 0.7 MeV resonance in the 230 Th neutron-induced cross section is investigated within the hybrid model. A very good agreement with experimental data is obtained. It is suggested that fine structure of the cross section quantify the changes of the intrinsic states of the nucleus during the disintegration process. Introduction. – The neutron-induced cross sections of 23...

The structure and barrier to internal rotation of 4-fluorophenol in the ground state and the electronically excited S1-state has been examined by resonantly enhanced two photon ionization spectroscopy and by rotationally resolved laser induced fluorescence spectroscopy of 4-fluorophenol and 4-fluorophenol-d1 . The rotationally resolved spectrum of the electronic origin of 4-fluorophenol is comp...

Actin performs its myriad cellular functions by the growth and disassembly of its filamentous form. The hydrolysis of ATP in the actin filament has been shown to modulate properties of the filament, thus making it a pivotal regulator of the actin life cycle. Actin has evolved to selectively hydrolyze ATP in the filamentous form, F-actin, with an experimentally observed rate increase over the mo...

The first diagonalization step in a rho-axis-method treatment of methyl-top internal rotation problems involves finding eigenvalues and eigenvectors of a torsional Hamiltonian, which depends on the rotational projection quantum number K as a parameter. Traditionally the torsional quantum number vt = 0, 1, 2···is assigned to eigenfunctions of given K in order of increasing e...

A high-quality mass-analyzed threshold ionization (MATI) spectrum of 2-chloropropene, 2-C3H5Cl, is reported. Its ionization energy determined for the first time from the 0-0 band position was 9.5395+/-0.0006 eV. Almost all the peaks in the MATI spectrum could be vibrationally assigned utilizing the frequencies calculated at the B3LYP6-311++G(3df,3pd) level and the Franck-Condon factors calculat...