UHF机械调谐器调谐电容片形的程序设计

采用传输线理论可以计算机械式UHF调谐器对应不同频率点的调谐电容量。在进行满足直线频率关系的调谐电容片形设计时,应当求出调谐电容量C_Τ与旋转角θ的显式函数关系。但对于分布参数的电路,这有一定的困难。本文采用数值计算方法完成了具有良好直线频率跟踪特性的调谐电容片形的设计,并由计算机自动绘出了片形。     

石膏模-混凝土组合空腹楼盖用磷石膏力学特性研究

对石膏模-混凝土组合楼盖用磷石膏的抗压强度与含水率的关系、抗压强度取值、弹性模量取值、石膏与混凝土之间两类抗剪连接件受力性能进行了试验研究。研究结果表明,磷石膏的抗压强度随含水率的减小而增大,且随着含水率的降低,磷石膏的强度增加幅值越来越大,大致呈对数函数关系;磷石膏具有较好的抗压性能,其抗压强度较高,抗压强度可取4.8MPa,且受力过程中有明显的弹性阶段,根据曲线,其弹性模量取值约550MPa;对混凝土与石膏间的两类剪力连接件进行推出试验,结果表明两类连接件具有相同的抗剪强度,而B类连接件比A类连接件连接效果优越,试验数据比较稳定,最终以石膏破坏而导致构件破坏,连接件较为可靠。     

Muon Motion Induced by a Superintense Laser in Muon‐Catalyzed Fusion

Considering the mixture after muon‐catalyzed fusion (μ CF) reaction as overdense plasma, we study muon motion in the plasma produced by a superintense linearly polarized femtosecond laser pulse. Muon drift along the propagation of laser radiation remains after the end of the laser pulse. At the peak laser intensity of 10²¹W/cm², muon goes from the skin layer into field‐free matter at short time which is much less than the pulse duration, before the laser pulse reaches its maximum. Besides, the influence of the laser on other particles in the plasma is less. Hence, this work can avoid muon sticking to alpha (α) effectively and reduce muon‐loss probability in μ CF. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

插肩袖的结构设计

分析了插肩袖的结构形式,得出了合体插肩袖型的结构设计方法．为裁好插肩袖提供了理论基础依据．     

滚动轴承力与变形关系试验装置设计

提出了一种测量滚动轴承力与变形关系的试验装置的设计方案,完成了试验原理的拟定、测量方案的设计和结构设计等工作。该装置可用于验证滚动轴承力与变形之间关系的计算公式的正确性,为下一步试验装置的制作和试验测量提供了前提条件。     

Evaluation of image sticking property on liquid crystal displays with polymer layers produced from phenanthrene-carrying monomers

As a model of polymer-sustained-alignment liquid crystal display (PSA-LCD), the liquid crystal (LC) cells having the polymer layers produced from monomers of phenanthrene (Phen)-carrying monomers, 2,7-, 3,8-, 1,8- and 3,6-dimethacryloyl-oxy-phenanthrene (DMAPhen), were prepared and investigated image sticking phenomenon with evaluations of residual direct current voltage (V_rDC) and difference in pretilt angle before and after application of alternate current voltage (Δtilt). The V_rDC values were small for the LC cells with the polymer layers produced from the Phen-carrying monomers used in this study. On the other hand, Δtilt depends on the molecular structure of the Phen-carrying monomer. The Δtilt values became small with increasing the linearity of the monomer structure for the Phen-carrying monomers. The findings would be useful for obtaining the small level of image sticking in the PSA-LCDs produced from the Phen-carrying monomers.     

Block designs signed over groups of order 2n3m

We introduce a new piecewise construction technique for generalised Bhaskar Rao designs and the concepts of generalised Bhaskar Rao block design pieces and holey generalised Bhaskar Rao block designs. We prove composition theorems for these designs. Using this construction technique and the theory of group representations, and the representations of $2$-groups over the field with $3$ elements, we show that the established necessary conditions for the existence of generalised Bhaskar Rao designs of block size $3$ are sufficient for all groups of order $2^n{3}^m$.     

Prediction of particle sticking efficiency for fly ash deposition at high temperatures

The tendency of ash particles to stick under high temperatures is dictated by the ash chemistry, particle physical properties, deposit surface properties and furnace operation conditions. A model has been developed in order to predict the particle sticking efficiency for fly ash deposition at high temperatures. The model incorporates the particle properties relevant to the ash chemistry, particle kinetic energy and furnace operation conditions and takes into consideration the partial sticking behaviour and the deposit layer. To test the model, the sticking behaviours of synthetic ash in a drop tube furnace are evaluated and the slagging formation from coal combustion in a down-fired furnace is modelled. Compared with the measurements, the proposed model presents reasonable prediction performance on the particle sticking behaviour and the ash deposition formation. Through a sensitivity analysis, furnace operation conditions (velocity and temperature), contact angle and particle size have been found to be the significant factors in controlling the sticking behaviours for the synthetic ash particles. The ash chemistry and furnace temperature dictate the wetting potential of the ash particles and the melting ability of the deposit surface; particle size and density not only control the particle kinetic energy, but also affect the particle temperature. The furnace velocity condition has been identified as being able to influence the selective deposition behaviour, where the maximum deposition efficiency moves to smaller particles when increasing the gas velocity. In addition, the thermophoresis effect on the arrival rate of the particles reduces with increasing the gas velocity. Further, increasing the melting degree of the deposit layer could greatly enhance the predicted deposition formation, in particular for the high furnace velocity condition.     

隧洞掘进机预制混凝土管片的生产

介绍了隧洞掘进机预制混凝土管片厂的生产线模式,对管片生产能力的确定和生产线的设计、管片生产工序、管片混凝土质量的控制等关键问题进行了探讨。     

基于遇卡识别的改进Kalman滤波器模型-加速度校正方法

由于FMI成像测井仪器在井下做复杂的非匀速运动,导致成像图像出现严重的畸变现象,需要通过加速校正来恢复采样数据对应的真实深度。针对传统Kalman滤波器模型-加速度校正方法对“遇卡区域”适应性较差的现象,首先对仪器在井下的运动状态进行分析,识别出仪器的遇卡区域,然后利用遇卡识别结果对传统的Kalman滤波器数学模型进行改进,首次考虑了仪器相邻遇卡现象的叠加情况。结果表明:改进后的方法不仅有效地解决了“粘滞滑动区域”的锯齿现象,而且较好地消除了“遇卡区域”的压缩拉伸现象,恢复了地层的原貌。该方法不仅适用于FMI成像测井,同样适用于其他成像测井系列,尤其有助于改善国产成像仪器图像的质量,具有推广应用价值。