ABSORPTION OF HYDROGEN BY VANADIUM-TITANIUM ALLOYS

The pressure-composition isotherms for V-Ti alloys containing titanium up to 30 at% were measured and the dependence of hydriding and dehydriding characteristics on titanium content was examined in relation to their structures. V-Ti alloys show great resistance to pulverization on hydriding and dehydriding cycles and titanium as an alloy partner gives advantageous modifications, i. e., easy \u27activation\u27, rapid absorption and desorption of hydrogen and a significant increase in the enthalpy change for the formation and decomposition of the dihydride phase, while the alloys exhibit large hysteresis and sloping plateau which could be ascribed to the inherent nature of vanadium and phase separation due to monotectoid reaction possibly existing at the vanadium-rich side of the phase diagram, respectively

Numerical and Experimental Simulation of Seismic Site Responses

Prediction of seismic site responses has been one of the most important tasks in geotechnical earthquake engineering. Since Kanai used the multiple wave reflection theory to compute horizontal ground movements against seismic shaking, a number of researchers have extended the basic concept proposed by Kanai. Performance of seismic site response methods, however, has always invited open questions for problems involving extreme seismic shaking and large deformation of soils due, for example, to liquefaction and lateral spreading. A new numerical method SRANG3D (Site Response Analysis of Non-linear Ground in 3 Dimensions) has been developed to improve our prediction capabilities for seismic site responses. SRANG3D computes seismic site responses that involve vertical propagation of two horizontally polarized S waves and one P wave. The most distinct feature of SRANG3D is that the stress-strain relationships of soil can be represented by a combination of various elasto-plastic constitutive soil models and discrete element models. This paper introduces the new site-response analysis method SRANG3D and the paper highlights results obtained from this new method. Our study demonstrated that SRANG3D yields improved predictions of the large-scale experimental data than currently available site-response analysis methods

スキーヤーの関節動作と作用力の測定

金沢大学工学

Effect of Alumina Fibers on Fabrication Process and Characteristics of Alumina Fiber Reinforced Aluminum Alloy Composites

In order to develop the alumina fiber reinforcements optimized to FRMMCs, the effect of characteristics of alumina fibers on the fabrication process and the characteristics of the alumina fiber reinforced Al alloy composites was investigated. Alumina fibers which have different alumina content were prepared. Alumina content in the fibers was varied from 80% to 100%. Al-4mass%Cu alloy, Al-12mass%Si alloy and Al-10masss%Mg alloy were used as matrix. The FRMMC specimens were fabricated by a low-pressure infiltration process (LPI process). The formability of the preform was improved with increasing alumina content in the fibers. However, broken fibers were observed in the preform when alumina fibers with high alumina content were used. The number of the broken fibers seemed to be increased with increasing alumina content in the fibers. This result could be attributable to a change of fiber strength resulting from a change of alumina content in the fiber. The FRMMC specimens were characterized by using Vickers hardness test. The Vickers hardness of FRMMC specimens depended on the elasticity or the hardness of the fibers. The results obtained suggest that the characteristics of the FRMMCs largely depend on the intrinsic characteristics of the reinforcement fibers.6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC\u272009; Berlin; 25 August 2009 through 29 August 2009; Code 7924

The HIV-1 Vpr displays strong anti-apoptotic activity

AbstractMutations in the human immunodeficiency virus type 1 (HIV-1) vpr gene only slightly reduce the replication rate of the virus. To study the role of HIV-1 Vpr in biological effects on cells, HEp-2 cells, which express HIV-1 Vpr constitutively but at a low level, were established. While control HEp-2 cells underwent apoptosis when incubated with sorbitol, the morphological and biochemical apoptotic changes were inefficiently induced in the HIV-1 Vpr-expressing cells by the same treatment. These results clearly indicate that HIV-1 Vpr has anti-apoptotic activity, and raise the possibility that Vpr acts as a weak activator of virus replication through anti-apoptosis

Electrodeposition of ZnTe Compound Semiconductors from Aqueous Solution

ZnTe compound semiconductors were synthesized in acidic aqueous solution using a pulsed current electrodeposition technique. The optimum condition to obtain ZnTe deposits was determined by the cathodic polarization curves measured at a wide potential range. During the co-deposition of Zn and Te, under potential deposition (UPD) of Zn was observed. Increasing the solution temperature up to 353 K, UPD of Zn was promoted by the formation of Zn(OH)2. Crystal phase, structure and chemical composition of electrodeposited ZnTe was controlled by the solution composition and electrolysis condition. The band gap energy of ZnTe films annealed at 573 K was close to 2.26 eV

Electrodeposition of Ferromagnetic Metal Nanowires

Ni-Fe alloy films and nanowires were fabricated using electrodeposition technique. The cylindrical shape of nanowires was precisely transferred from the nanochannels of membrane filters and the aspect ratio reached to around 60. Coercive force in in-plan direction of Ni-Fe alloy films decreased to ca. 1 Oe with increasing Fe content in deposits while, in perpendicular direction, the films were hardly magnetized. Magnetic hysteresis loops revealed that the nanowires were spontaneously magnetized to the long axis direction and the coercive force reached to ca. 200 Oe.6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC\u272009; Berlin; 25 August 2009 through 29 August 2009; Code 7924