Wavelet transform coding for MCP error images using quadtree decomposition and ECVQ

This paper proposes a new wavelet transform video coder which employs motion compensation, wavelet decomposition, and entropy-constrained vector quantization (ECVQ), in sequence. Each of layered subimages obtained from wavelet decomposition is segmented into basic blocks, and then the blocks are selectively encoded by ECVQ according to the energy of the samples. We introduce an efficient method to encode the map representing which blocks are encoded, based on inter-band prediction followed by a quadtree encoding. The proposed coder uses a simple forward analyzer in order to optimize the encoding parameters and introduces a preprocessing of signals which normalizes the input vectors of ECVQ in order to reduce the image-dependency of ECVQ codebooks. Simulation results show that our video coder provides good PSNR (peak-to-peak signal-to-noise ratio) performance and efficient rate control.     

Improvement of the Q-factor,for an adjustable inductor using a 90-μm silicon substrate on plastic

This article presents a four-port adjustable inductor with 0.18?µm Complementary Metal-Oxide-Semiconductor (CMOS) technology on plastic. The inductor has a high Q-factor and a small size for multiband UWB applications. When the four-port adjustable inductor, on VLSI-standard Si substrate, operates near 3, 4, 7.5 and 9?GHz, it has a Q-factor of 6.5, 6.7, 8 and 11.5 and an inductance of 2.1, 1.6, 1.1, 0.6?nH, respectively. Reducing the thickness of the Si substrate to 90?µm and mounting it on plastic causes a 25–31% improvement in the Q-factor, without change in the inductance, due to a reduction in the parasitic effect from the Si substrate. This is useful for multiband applications.     

All-spray-coated semitransparent inverted organic solar cells: From electron selective to anode layers

We demonstrated an all-solution-processed electron selective layer, active layer and top electrode for large-area inverted organic solar cells. The fabricated devices are semitransparent, fully spray-coated, highly efficient and air-stable, with power efficiencies of 2.41% and 1.0% for cell areas of 0.36 and 15.25 cm², respectively. The shelf life of the cells in air is demonstrated by the ∼80% retention of original cell efficiency after 30 days.     

网元观点的PDH光传输系统信息模型研究

本文采用在ＩＴＵ－ＴＧ．８０５建议中定义的传送网通用功能结构模型，建立了ＰＤＨ传送网功能结构模型；在这一达网功能结构模型的基础上，结合ＰＤＨ光传输系统的网管要求，建立了网元观点的ＰＤＨ光传输系统信息模型。     

第七届世界军人运动会核与辐射风险评估与控制

武汉市涉核单位众多,存在一定的核与辐射事故风险。通过对武汉市举办第七届世界军人运动会可能存在的核与辐射风险因素进行识别及评价,确定可能发生的12类核与辐射事故类型及风险水平,进而有针对性的制定风险防控措施,做到辐射应急管理关口前移,在保证军运会期间核技术利用单位正常生产活动的基础上有效的保障了核与辐射安全。     

Demonstration of EBR-II power maneuvers without control rod movement

A group of five plant inherent control tests was successfully conducted in November 1987 in the Experimental Breeder Reactor II. These tests demonstrated that the plant power of a metal-fueled reactor can be passively controlled over a large power range by slowly changing the primary flow and the reactor inlet temperature. These variables are, in turn, regulated by the primary pump speed, the secondary flow, and the turbine inlet pressure. In all tests, control rods were not used to regulate power. It was demonstrated that the plant power can be controlled with reasonable accuracy without using control rods when the reactivity feedback characteristics of the reactor are well understood and the plant controllers are adequately designed.     

Performance of FCCI barrier foils for U-Zr-X metallic fuel

Diffusion couple tests of U-Zr or U-Zr-Ce alloys vs. ferritic martensitic steels such as HT9 or T91 were carried out in order to evaluate the performance of the diffusion barrier candidates. Elemental metal foils of Zr, Nb, Ti, Mo, Ta, V and Cr were very effective in inhibiting interdiffusion between these fuels and steels. Eutectic melting between the fuels and steels was not observed in any of the diffusion couples using these diffusion barrier foils at annealing temperatures up to 800 °C. Among the metallic foils evaluated in this study, V and Cr exhibited the most promising performances as a diffusion barrier material for eliminating the fuel cladding chemical interaction problem. However, Zr, Nb and Ti showed an active interaction with the fuel mainly due to the large U solubility.     

白云鄂博主东矿中贫氧化矿铌资源的特点及综合回收

包头白云鄂博主东矿中贫氧化矿中铌有很大的回收价值,本文探讨了主要铌矿物的特点及选矿性质,认为弱磁—强磁是初步富集铌的有效途径。本文还较为详细地介绍了从强磁中矿的稀土浮选尾矿回收铌得到富铌铁精矿的若干浮选工艺条件及浮选药剂。     

Convective instabilities and transport properties in horizontal fluid layers

This paper concerns the analysis of convective instabilities and fully developed transport properties in Bénard convection. The onset of convective instabilities driven by surface-tension variations and buoyancy forces is analyzed theoretically by using the propagation theory we have developed. Based on these stability criteria, the subsequent transport correlations of fully developed buoyancy-driven convection in horizontal fluid layers are suggested. It is found that the present predictions are compared favorably with existing experimental results.     

KINETIC STUDY OF SYNTHESIZING UNSYMMETRIC ACETALS UNDER PHASE TRANSFER CONDITIONS

An effective method was proposed to determine the two organic-phase rate constants of the primary and secondary reactions which have differences in rates. The goal was achieved by employing the reaction of two mixed l-alcohols and dibromomethane in an alkaline solution of KOH/chlorobenzene two-phase medium under phase transfer catalysis. A new product of unsymmetric acetal was obtained in this work. The intermediate ROCH₂Br (a-haloalkyl ether) was not detected during or after the reaction when using high reactive alcohols. This result indicated that ROCH2Br was more reactive than the organic reactant CH₂Br₂. This high reactive a-haloalkyl ether implied that the rate constants of secondary reactions are larger than those of the primary reactions. The resistance of mass transfer of the catalyst ((C₄H₉)₄NBr, QBr) and the active catalyst, ((C₄H₉ )₄NOR, QOR R: c₄h₉and C₈h₁₇) transferring from the aqueous phase to the organic-phase and vice versa were found to be negligible. The organic-phase reaction is a rate-determining step of the phase transfer catalytic reaction, A measured constant concentration of tetrabutylammonium alkoxide (QOR) during the reaction leads to the application of pseudo-first order rate law. The reaction rate constant of ROCh₂Br acts 10⁴ larger than that of CH₂Br₂.