Ultrafast operation of Vth-adjustedp+-n+ double-gate SOI MOSFET's

To optimize the V_th of double-gate SOI MOSFET's, we fabricated devices with p⁺ poly-Si for the front-gate electrode and n⁺ poly-Si for the back-gate electrode on 40-nm-thick direct-bonded SOI wafers. We obtained an experimental V_th of 0.17 V for nMOS and -0.24 V for pMOS devices. These double-gate devices have good short-channel characteristics, low parasitic resistances, and large drive currents. For gates 0.19 μm long, front-gate oxides 8.2 nm thick, and back-gate oxides 9.9 nm thick, we obtained ring oscillator delay times of 43 ps at 1 V and 27 ps at 2 V. To our knowledge, these values are the fastest reported for this gate length with suppressed short-channel effects     

Granulocyte superoxide anion and elastase release during cardiopulmonary bypass

Cardiopulmonary bypass (CPB) is known to induce several pathogenic responses in cardiovascular surgery. To explore leukocyte activation during PCB, we investigated superoxide anion (O2-) production by granulocytes in 6 patients undergoing aortocoronary bypass surgery. O2- production was determined with chemiluminescence amplified by a cypridina luciferin analogue. Granulocytes collected from the blood in the arterial site of the CPB circuit were stimulated by phorbol myristate acetate, n-formyl-methionyl-leucyl-phenylalanine, and opsonized zymosan. All the stimulators failed to disclose a significant difference between the magnitude of chemiluminescence during and after CPB. However, significant complement activation was detected, and the plasma level of granulocyte elastase increased gradually during and after CPB. This discrepancy between the unchanged O2- production by stimulated granulocytes and the increase in inflammatory mediators including granulocyte elastase may be due to sequestration of activated granulocytes in extravascular tissues. Namely, it was highly likely that activated granulocytes responsible for the increased plasma elastase level were sequestered and remained outside the blood circulation.     

Low Temperature Phase Transition in C70 and Solvation Effects

The heat capacity of C₇₀ has been measured by adiabatic calorimetry between 14 and 320 K. The orientational phase transition is observed as a broad hump in the heat capacity curve, which is strongly influenced by small amount of solvent remaining in the sample.     

Motions of alloying additions during furnace tapping in steelmaking processing operations

Numerical computations were carried out to describe the subsurface trajectories of spherically shaped particles (alloy additions) during simulated furnace to ladle tapping operations in steel-making. Complementing this, experiments in a 0.15 scale water model ladle of a 250 ton teeming ladle were also carried out so as to simulate the subsurface trajectories and total immersion times of various alloy additions as a function of (steel) jet orientation, jet entry locations, particle (alloy additions) entry location, particle shape, density,etc. Similarity criteria for model and prototype were deduced on the basis of Froude modeling. The possibilities of additions of various density being entrained into the bulk liquid and under-going prolonged subsurface motion were examined for a variety of operating conditions. It was found, however, that buoyant spherical particles with apparent densities ranging between 0.4 and 0.9 would, when projected into a recirculating water bath at velocities of 2.7 m/s, record total immersion times of only 0.1 to 40 seconds. The implications of the water model study, together with some idealized sets of computations for an industrial size 250 ton ladle, are analyzed from the viewpoint of industrial alloy addition practices. Finally, the results are examined with reference to different shaped particles and multi-particle addition procedures, since the latter are more typical of industrial practice. Formerly Doctoral Candidate, Department of Mining and Metallurgical Engineering, McGill University Formerly Assistant Professor, Department of Metallurgical Engineering, Indian Institute of Technology, Kanpur, 208016, India     

Absence of linkage disequilibrium at amyloid precursor protein gene locus in Japanese familial Alzheimer's disease with 717Val-->Ile mutation

To date, eleven independent early onset familial Alzheimer's disease (EOFAD) pedigrees with the 717Val-->Ile mutation of amyloid precursor protein (APP) gene have been identified. Interestingly, five pedigrees have been of Japanese origin. The apparent ethnic prediction of this mutation raises the possibility that there is a founder effect in Japan. If the hypothesis holds true, we can expect the presence of linkage disequilibrium at the APP locus. We did not, however, observe any significant linkage disequilibrium at any locus of APP or the adjacent GT12 locus in the five Japanese EOFAD probands with the 717Val-->Ile mutation. The result indicates that a founder effect would probably not be present in Japanese EOFAD pedigrees with the 717Val-->Ile mutation.     

The development of a diagnostic and monitoring system for vibrating pipe branches

This paper deals with a diagnostic and monitoring system for assessing the integrity of pipe branches, during the operation of the nuclear power plant. This system have been developed under the concept of “easy to use without any sophisticated analysis” and “portable”. The accuracy of the diagnosis is based on the model optimization subsystem, which automatically modifies the numerical vibration model so as to fit its natural frequency to the actual natural frequency. The information obtained by this system may be reflected to a maintenance program of the plant to assure more reliable operation of the plant.     

Proton decay measurement with RIPS for astrophysical interest

The decay property of ²⁰Na was studied using a ²⁰Mg beam to obtain a better understanding of the onset mechanism of the rapid proton process. The delayed protons were successfully measured, which correspond to one of the known 1⁺ states. There is no clear beta decay to the first excited 1⁺ state above the proton threshold in ²⁰Na, suggesting that this state would not be the s-wave resonance as was expected before. The present result is preliminary; the final result will be published elsewhere.     

Dural-pial arteriovenous malformation after sinus thrombosis

BACKGROUND: We report an unusual case of acquired dural-pial arteriovenous malformation (AVM) following sinus thrombosis. CASE DESCRIPTION: Initial angiography performed in a 39-year-old man showed thrombosis of the superior sagittal sinus (SSS) and the right transverse sinus (TS) but no vascular malformations. Follow-up angiography 29 months later revealed recanalization of the SSS and the TS, retrograde cortical venous drainage which suggested that thrombosis of the sinuses probably propagated into the adjacent parietal cortical veins, and development of a dural-pial AVM at or near the site of thrombi in more than one cortical vein. Complete surgical excision of the lesion was accomplished without neurological deterioration. CONCLUSIONS: The present case suggests the possibility that the pial AVM is not only a congenital condition but also may develop as an acquired lesion.     

Failure characteristics of osteoporotic vertebral bodies monitored by acoustic emission

The third lumbar vertebrae of nine elderly subjects (average age, 81.4 +/- 6.7 years) graded osteoporotic and the second to fifth lumbar vertebrae of a 37-year-old man graded as normal were used to investigate microdamage accumulation during quasi-static compression loading with an acoustic emission detection system. Mechanical parameters (apparent elastic modulus, stress, and strain) and acoustic emission event count rates were measured simultaneously. The normalized mean value of any mechanical parameters of normal group was significantly high with respect to that of osteoporotic group. The normalized mean value of cumulative acoustic emission event counts to maximum stress of the normal vertebrae was substantially small with respect to that of the osteoporotic vertebrae (p < 0.0005, z-test). Postloading microradiographs displayed fracture lines adjacent to the end plates in six vertebrae of osteoporotic group. These results are consistent with the hypotheses that microdamages of osteoporotic vertebral bodies are generated and accumulate at lower strains than those of normal vertebrae at a specific site.