Pinning of Dislocation Motion in bcc Solid 3He

We have measured the dissipation of dislocation motion in bcc solid ³ He using the high-Q torsional oscillator technique at 1079 Hz. We observed a broad maximum in the temperature dependence of the dissipation. The maximum of the dissipation can be explained by the theory of Granato and Lucke in which the dislocation mobility depends upon the interactions of dislocations with point defects. ⁴ He impurities tend to bind to the dislocation lines at low temperatures and pin this dislocation motion. The maximum of the dissipation corresponds to the depinning of the dislocation motion. From the amplitude dependence of the depinning temperature we first obtained the activation energy of 1.03 K of the impurity ⁴ He atom trapped on the dislocations in bcc solid ³ He at a molar volume of 24.30 cm ³ /mol. The activation energy of the impurity atom in bcc ³ He was found to be larger than the value of 0.7 Kin hcp ⁴ He.     

An approach for quantum mechanical modeling and simulation for MOS devices, covering the whole operation region

A quantum mechanical (QM) approach for modeling and simulation of MOS devices, covering the whole operation region, was proposed. This formulation is applicable continuously from the subthreshold to the saturation regions, since it exactly treats the QM effects on the in-depth distribution of the gate induced carriers in the channel by solving one dimensional Poisson equation and Schrödinger equation self-consistently and it treats the lateral drift–diffusion transport using quasi-Fermi potential. A QM simulator was implemented using this QM approach. This QM simulator was verified by classical three-dimensional device simulator, CADDETH, in the whole range of operation of bulk MOSFET with low dopant density where QM effect is negligible. The QM simulation elucidated that the threshold voltage shift in thin SOI MOSFETs in saturation region as well as in linear region results from energy shift of the lowest conduction electron level and effective increase of gate oxide thickness.     

Dynamic interaction of attractors across multiple cortical networks as a neural basis for intersensory facilitation

I propose a neural network model for intersensory facilitation and investigate its essential neuronal mechanisms. The model consists of sensory networks (SI, SII) and an integration network (IT). The integration network binds information derived from the sensory networks and sends feedback signals to them. Through a Hebbian learning process, point attractors representing individual features and objects are created in the dynamics of the sensory networks and integration network, respectively. The ongoing state of each network is a randomly itinerant state among these point attractors. When the SI network is stimulated with a feature (I_ n ) belonging to an object (O_ n ) with suprathreshold intensity, the point attractor corresponding to I_ n emerges in the SI network, but does not when stimulated with subthreshold intensity. Intersensory facilitation occurs when associate feature II_ n derived from the other modality belonging to the same object (O_ n ) is simultaneously presented to other sensory network SII, where the point attractor corresponding to feature I_ n emerges even when the sensory networks are stimulated with subthreshold intensity. I suggest here that the dynamic interaction of relevant point attractors across multiple neural networks is essential for intersensory facilitation, and that self-organized synaptic modulation effectively contributes to intersensory facilitation when crossmodal stimuli are separated in time.     

PFC emission‐reduction strategy for the LCD industry

Abstract— The perfluorocarbons (PFCs) used as etching‐process and chamber‐cleaning gases in the manufacture of LCD devices have a high global‐warming potential and a long atmospheric lifetime. Thus, to voluntarily reduce these environmentally harmful PFCs, in 2001 the Japanese LCD association established the World LCD Industry Cooperation Committee (WLICC), together with its counterpart associations in the Republic of Korea and Taiwan. Since that time involving many discussions, the WLICC reached a consensus on reducing the aggregate absolute PFC emissions to the equivalent of less than 0.82 million metric tons of carbon by 2010. Each association has been taking whatever emission reduction steps it considers best to achieve this goal. Thanks to these measures, the PFC emissions from the Japanese LCD industry have remained at the same level, or less, than those of the year 2000, in spite of the fact that PFC purchases have continually increased. In the interim, the Japanese LCD association has been obtaining experimental data for the 2006 IPCC Inventory Guidelines, which will give the emission factors needed to estimate the PFC emissions. As a result, some data are quite different from emission factors given in the current 2000 Inventory Guidelines. All the data obtained have been submitted to the IPCC to be adopted in the new 2006 Guidelines.     

Assessment of regional sympathetic nerve activity in vasospastic angina: analysis of iodine 123-labeled metaiodobenzylguanidine scintigraphy

Injury of the normal central nervous system is a major concern in the radiotherapy of brain tumors, but the pathogenesis of injury remains poorly understood. Modulation of the production of growth factors is associated with ischemia and traumatic injury in the central nervous system. Ionizing radiation has been shown to induce basic fibroblast growth factor in endothelial cells and in cells of a human breast carcinoma cell line. The inducibility of basic fibroblast growth factor after irradiation and its potential role in the recovery response of the central nervous system led us to investigate the effects of radiation on the expression of this growth factor in primary cultures of normal rat type 1 astrocytes. Astrocyte monolayers were exposed to ionizing radiation (1 to 10 Gy). Northern blot analysis revealed that doses of 2 to 10 Gy markedly reduced the expression of basic fibroblast growth factor as early as 1 h after irradiation, and that it remained below levels in unirradiated cells for at least 24 h. The effect was not associated with astrocyte cytotoxicity, and it appears to have some specificity for basic fibroblast growth factor since the levels of mRNA coding for ciliary neurotrophic factor and glial fibrillary acidic protein were not affected.     

Reliability of rare-earth-doped fluoride fibers for optical fiberamplifier application

We have clarified the strength and estimated lifetime of fluoride fibers for optical amplifier use. We fabricated a UV-curable epoxy-acrylate coated fluoride fiber with a strength of 542 MPa. We estimated the lifetime of the fluoride fiber to be longer than 25 years at 80°C and 50% RH     

Development of XLPE insulated DC cable

This paper describes the development of dc XLPE cable. Through a series of material investigations, an XLPE compound containing highly purified special filler was developed. To check the dc insulation performance of the cable insulated with this new material, a prototype cable with 9 mm insulation thickness was manufactured. It was confirmed that the performance of the prototype cable was excellent. Based on the study of the prototype cable, a 250-kV dc cable with 20 mm insulation thickness was designed and manufactured. Through a series of voltage tests, excellent dc insulation performance of the developed cable was verified.     

Design of an adaptive observer for sensorless vector control of induction machines under regenerating conditions

The objective of this investigation is to stabilize a sensorless vector control system of induction motors by means of an adaptive observer in regenerating mode at very low speed. The adaptive observer gain is designed by means of the Routh–Hurwitz criterion. It is verified by simulation and experiment that the proposed system is stable. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 145(4): 78–87, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10202     

A case of primary malignant lymphoma of the bladder

There are few reports of the sonographic appearance of Meckel's diverticulum. We present a case of torsion of a Meckel's diverticulum that was suggested by sonography and confirmed pathologically. We discuss the sonographic differential diagnosis, which includes acute appendicitis, enteric duplication cyst and intestinal volvulus.