Density functional theory was used to study the mechanism for the oxidation of methanol to formaldehyde. A vanadium oxide cluster O=V(OH)(3) has been utilized to represent the catalytic system under hydrated conditions, i.e., in the presence of V-OH hydroxyl groups. Two types of methoxy-intermediates have been considered: a penta-coordinate methoxy-intermediate (OH)(4)V(OCH(3)) and a tetrahedra...

SiO2/V2O5/TiO2 catalysts were synthesized for removing elemental mercury (Hg0) from simulated coal-combustion flue gas. Experiments were carried out in fixed-bed reactors using both pellet and powder catalysts. In contrast to the SiO2-TiO2 composites developed in previous studies, the V2O5 based catalysts do not need ultraviolet light activation and have higher Hg0 oxidation efficiencies. For H...

Immediate loading in dental implants ( A literature review ) Dr. Seyedan K.,1 Dr. Hafezeqoran A.,2 Dr. Sazgara H.3 1Assistant Professor, Department of Prosthodentists,Dental School Shahid Beheshti University of Medical Sciences,Tehran, Iran.2Dentist, Post Graduate Student, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran-Iran.3Associate Profess...

Finite element analysis of a tubular T-joint subjected to various loading conditions including pure axial loading, pure in-plane bending (IPB) and different ratios of axial loading to in-plane bending loading has been carried out. This effort has been established to estimate magnitudes of the peak hot spot stresses (HSS) at the brace/chord intersection and to find the corresponding locations as...

s 8 Session 1: Intervertebral Discs 9 Session 2: Spinal Motion Segment: Load Sharing and Failure 16 Session 3: Spinal Loads: In vivo Measurements 20 Session 4: Spinal Biomechanics: Loading-Deformation 25 Session 5: Spinal Posture: Deformation 29 Session 6: Spinal Stability: Perturbations 34 Session 7: Spine Biomechanics: Computational Models 39 Session 8: Spine Biomechanics: Implants 44 Index o...

Experimental investigation of the ultimate resistance of slender, steel-plate girder web panels to combined shear-and-patch loading indicates significant interaction between shear loading and patch loading. However, an existing interaction formula is based on experimental results. Herein, an improved design procedure for slender plate girders subjected to combined shear and patch loading is pro...