阳离子改性滑石粉处理OCC纸浆中胶黏物的研究

研究了阳离子改性滑石粉处理废旧瓦楞纸箱(old corrugated containers,OCC)纸浆胶黏物过程的影响因素和作用机理,同时比较了改性前后滑石粉对胶黏物作用效果的差异。结果表明:在一定的滑石粉用量的条件下,适当的纸浆温度和浓度可以促进改性滑石粉的作用效果,当改性滑石粉用量为1.5%,温度80℃,浆浓为20%(wt)时,胶黏物去除率可达到58%;阳离子型助剂能够使滑石粉表面带正电荷,增大滑石粉的比表面积,促进胶黏物吸附改性滑石粉,形成胶黏物―滑石粉微球,有利于胶黏物黏性降低和去除;由OCC手抄片的纸性检测发现:其作用后纸页的紧度、耐破指数、抗张指数和撕裂指数略有下降。     

Development of a dimensionless parameter for characterization of dielectric barrier discharge devices with respect to geometrical features

Non-thermal plasma (NTP) devices produce excited and radical species that have higher energy levels than their ground state and are utilized for various applications.There are various types of NTP devices,with dielectric barrier discharge (DBD) reactors being widely used.These DBD devices vary in geometrical configuration and operating parameters,making a comparison of their performance in terms of discharge power characteristics difficult.Therefore,this study proposes a dimensionless parameter that is related to the geometrical features,and is a function of the discharge power with respect to the frequency,voltage,and capacitance of a DBD.The dimensionless parameter,in the form of a ratio of the discharge energy per cycle to the gap capacitive energy,will be useful for engineers and designers to compare the energy characteristics of devices systematically,and could also be used for scaling up DBD devices.From the results in this experiment and from the literature,different DBD devices are categorized into three separate groups according to different levels of the energy ratio.The larger DBD devices have lower energy ratios due to their lower estimated surface discharge areas and capacitive reactance.Therefore,the devices can be categorized according to the energy ratio due to the effects of the geometrical features of the DBD devices,since it affects the surface discharge area and capacitance of the DBD.The DBD devices are also categorized into three separate groups using the Kriegseis factor,but the categorization is different from that of the energy ratio.     

基于移动社交网络的空间资源利用分析系统*

提出并设计了一个办公环境下室内空间资源利用分析系统。该系统以基于位置的移动社交网络获取用户的位置数据,并以此产生用户活动热度分布图。以热度图形式展示一段时间内各空间处的人员密度高低,进而反映室内空间资源的利用情况。通过对会议室的实际利用情况与对应热度图比较,结果的一致性证明了该方案和系统的有效性及可靠性。     

Stability of non-linear systems via the intrinsic method

A new method, called the intrinsic method, is proposed in this paper to derive suitable Lyapunov functions for a general class of non-linear systems expressed in state variables as n first-order non-linear differential equations. This method, which applies the integration-by-parts procedure, derives a Lyapunov function directly from the differential equations under study.     

A Schematic Urban Street Network-Display Algorithm

The link-node network is the most commonly used model for representing a large-scale urban street system. It is easy to formulate a mathematical model which describes the complicated spatial and temporal urban-street-related problems on such a simplified network representation. However, recently developed microscopic network traffic models contain important details which cannot be depicted on the link-node diagram. This paper describes a computer-graphics algorithm which can generate a lane-detailed schematic urban street network display. The algorithm is very comprehensive, and it can accommodate various types of urban street configurations. The regular four-approach, right-angle intersection can be displayed most accurately. However, intersections with more or less than four approaches and/or links intersecting at an angle other than 90-deg can be generated satisfactorily. One-way streets intersecting two-way or one-way streets can also be depicted. Furthermore, roadways where the number of lanes changes (for example, from two lanes to three lanes, or from two lanes to one lane) can also be plotted. The overall quality of the display generated by this algorithm is satisfactory. The required input data is relatively simple, although the time associated with the input data preparation is short. In addition, applications using this algorithm are also discussed.     

Shearing interference microscope for step‐height measurements

A shearing interference microscope using a Savart prism as the shear plate is proposed for inspecting step‐heights. Where the light beam propagates through the Savart prism and microscopic system to illuminate the sample, it then turns back to re‐pass through the Savart prism and microscopic system to generate a shearing interference pattern on the camera. Two measurement modes, phase‐shifting and phase‐scanning, can be utilized to determine the depths of the step‐heights on the sample. The first mode, which employs a narrowband source, is based on the five‐step phase‐shifting algorithm and has a measurement range of a quarter‐wavelength. The second mode, which adopts a broadband source, is based on peak‐intensity identification technology and has a measurement range up to a few micrometres. This paper is to introduce the configuration and measurement theory of this microscope, perform a setup used to implement it, and present the experimental results from the uses of the setup. The results not only verify the validity but also confirm the high measurement repeatability of the proposed microscope.     

地震地区高速铁路桩基础设计考虑

主要说明台湾高速铁路工程南部段自里程TK188至TK343长约155km松软冲积层中桩基础设计中几个需详细考虑的因素特殊地盘效应、群桩效应、桩帽侧向阻抗及土壤液化地层滑移等。同时利用前期桩载重试验结果探讨桩身向上土壤抗拉拔力与桩身向下土壤正摩擦力的比例。基本上桩基础分析属土壤与基桩互制的行为分析,本文也说明由试验结果所得到的土壤p-y,t-z及q-w曲线如何应用于桩基础设计及分析土壤弹簧对桩基础及桥柱设计的敏感度,以便将设计分析经验供今后类似工程参考。     

Analysis of an electrohydraulic servo system subject to Stribeck-type friction

The main objective of this paper is to study the phenomena of the electrohydraulic servo system under the influence of the Stribeck-type friction. Owing to the nonlinear nature of this friction, a sustained oscillation, or limit cycle, might appear in the system behaviour. The system is first divided into two parts, the linear and the nonlinear. For the nonlinear Stribeck-type friction, a flexible model is proposed to represent the whole friction family, and the describing function of this nonlinear friction is generated. The system characteristic equation is established by correlating the frequency response of the linear part and the describing function of the nonlinear part. The existence and stability of the limit cycle are predicted based on the characteristic equation. Finally, by using the sinusoidal, step and ramp input, respectively, the numerical simulation is adopted to observe the system response. All predicted limit cycles can be verified by the simulation results, and the effects of stable and unstable limit cycles are clarified. The dynamic characteristics obtained in this study help to bring insight into this important engineering configuration and throw some light on the possibilities for improvement.     

The application of harmonic linearization to optimal control problems†

The method of harmonic linearization is used to obtain an approximate optimal control law for a second-order non-linear state-regulator problem.