Control of the coating layer thickness of TiO2–SiO2 core–shell hybrid particles by liquid phase deposition

This paper describes control of the coating layer thickness and the crystallite size of the core–shell hybrid particles by controlling the process parameter. The core–shell hybrid particles were prepared using liquid phase deposition (LPD). We confirmed that the homogeneous coating was attained from the result of the zeta potential and the transmission electron microscope (TEM) observation. Furthermore, the coating layer microstructure was estimated using Brunauer–Emmett–Teller (BET) method. The obtained coating layer of titania was estimated using the band gap energy. Results indicate that the blue shift of the band gap energy signifies that the physical property of the hybrid particles was controlled by the coating layer thickness and the crystallite size, which are determined by the processing parameters.     

Analysis of field distributions in a GaAs m.e.s.f.e.t. at large drain voltages

Electric-field distributions and carrier-density distributions in a GaAs m.e.s.f.e.t. at large drain voltages are investigated with a new analytical model, which takes account of the electron-drift-velocity saturation with negative differential mobility and the extension of a depletion layer towards the drain electrode.     

Dispersion-free single-mode fibre transmission experiments up to 1.6 Gbit/s

Long-span single-mode fibre transmission experiments at 1.3 ?m have been refined toward higher digit rate and longer fibre span. Error-rate against receiving optical level characteristics showed that optical power penalties at 100 Mbit/s, 1.2 Gbit/s and 1.6 Gbit/s are negligible, even after 30 km, 23 km and 13 km fibre transmission, respectively.     

11 GHz and 12 GHz multiwatt internal matching for power GaAs f.e.t.s

Multiwatt internal-matching techniques for multichip power GaAs f.e.t.s at 11 GHz and 12 GHz bands have been developed, adopting a lumped-element input circuit and a semidistributed output circuit. The internally matched device for the 11 GHz band exhibits 4 W power output with 3.4 dB associated gain, and the 12 GHz device 3.6 W power output with 3 dB associated gain.     

Segmental liver resections, present and future-caudate lobe resection for liver tumors

BACKGROUND/AIMS: Resection of the caudate lobe of the liver is difficult to perform because of a deep location and an adjacency to the major vessels. METHODOLOGY: A total of 30 patients with hepatocellular carcinoma (HCC) originating in the caudate lobe underwent hepatic resection. The lobe was classified to Spiegel's portion, the process portion, and the caval portion. The operative procedure undertaken was chosen on the basis of tumor location as well as hepatic function of each patient. RESULTS: In 14 patients who had an HCC located at Spiegel's portion or the process portion, the tumor was removed by local resection of the caudate lobe (n = 10), or by resection combined with lobectomy (n = 2) or subsegmentectomy (n = 2). In 16 patients with an HCC at the caval portion, caudate lobe resections with preparatory lobectomy (n = 6), segmentectomy (n = 1), or subsegmentectomy (n = 4) were performed. In the other 5, isolated total or partial resection of the caudate lobe was carried out because of the presence of severe cirrhosis. All operations were defined as curative, but produced two operative deaths due to liver failure. The cumulative rate of overall survival was 41% at 5 years after surgery. CONCLUSIONS: Caudate lobe resection for HCC can be performed even in cirrhotic patients with a favorable surgical outcome.     

A spectrometric method for determining the capability of intermolecular interaction: mono- and dideoxynucleotides

A method for detecting the dimer of mono- and oligodeoxynucleotides is presented by using fast atom bombardment mass spectrometry (FAB-MS). The mass spectrum of a mononucleotide dpC showed an intense peak of the dimeric ion dpC:::dpC, compared with those of dpA, dpG and dpT. The mass spectrum of an equimolar mixture of dpC and dpG showed the highest peak of the dimeric ion dpC:::dpG, compared with all other combinations. The dimeric ion peaks in the mass spectra of dinucleotides d(ApT) and d(CpG) were relatively high and it may reflect the base-pairing energy due to hydrogen bonding. The degradation patterns of each dimers for d(ApT) and d(CpG) obtained by using the collision-induced dissociation (CID) technique which reflected the strength of each base-pairing.     

铜阴极电解的EMD的电子微探分析

对EMD的电子微探分析(EPMA),发现有Cu的浓缩点存在,电感耦合等离子体发射光谱(ICP-AES)分析析值为0.8×10-4%.通过EPMA,可以对EMD进行微观解析.     

Graphite-epoxy laminates with almost null coefficient of thermal expansion under a wide range of temperature

A lamination tailoring technique is proposed in order to control a coefficient of thermal expansion of graphite-epoxy composites in a principal direction. This technique consists of two concepts of the thermoelastic invariants and the lamination parameters. The expansion free condition yields to a parabola in the feasible region of the lamination parameters. The calculated curves for a wide range of temperatures intersect almost at a point. A laminate with the lay-up construction corresponding to this point will exhibit an approximately null coefficient of thermal expansion in one direction in that temperature range. Some preliminary experimental results indicate that the present procedure is possible and promising. The tailored material will be appropriate for the space station structure.     

Polysynaptic neuronal pathways from group I and group II afferents innervating tail muscles to hindlimb motoneurons in the cat

Postsynaptic potentials evoked in motoneurons innervating m. posterior biceps and semitendinosus (PBSt) and m. triceps surae (GS) by low threshold afferents from various tail muscles located at the level of the second-third caudal vertebrae were investigated in the non-anesthetized and spinalized cat. Afferent inputs from tail muscles on both sides predominantly evoked depolarizing potential in PBSt motoneurons and hyperpolarizing potential in GS motoneurons. The findings suggest that in general, tail muscle afferents facilitate flexor and inhibit extensor hindlimb motoneurons through polysynaptic pathways, so that the pelvic girdle is kept in a low position to maintain the stability of the body irrespective of different movements or posture of the tail.     

AE behaviors evaluation with bp neural network

This paper reports our experiment on training a three layer forwards neural network with backpropagation algorithm (BP) to memorise acoustic emission (AE) behaviors of magnesium alloy during fatigue test process and perform the mapping from AE behaviors to fatigue crack propagation. This study reveals the potential possibility of using artificial neural networks for automated AE testing. Simulation results are very encouraging and conclusively in favor of this attempt.