Gel casting of large area micro- and sub-micropatterned thin ceramic tapes

In this study an easy-to-use ceramic processing technique based on temperature-controlled ionotropic gelation of alginate is presented. This method is the breakthrough for simultaneously large scale tape casting and high quality patterning of thin ceramic tapes. Alumina powder (d₅₀= 205 nm) is used to cast flexible and on demand shapeable tapes. Compared to conventional ceramic micropatterning, ionotropic gelation combines complexity of the patterned structure over large-scale areas, a high pattern resolution down to sub-µm regime (~400 nm) and tape thickness below 300 µm. Obtained green and sintered (1350 °C) micro- and sub-micropatterns are characterized by SEM and quantitative 3D-profilometry focusing on both, pattern quality and pattern aspect ratio. The results show that reproducible thin ceramic tapes featuring positive and negative patterns maintain their aspect ratios after demolding, drying and sintering. This processing route represents a versatile tool for designing tailored ceramics for e.g. microelectromechanical engineered systems, biomaterial or microfluidic applications.     

智能仪表中96单片机的应用技术

本文介绍了在智能仪表设计中，如何充分利用９６系列单片微机自身的硬件资源实现１２位以上高精度Ａ／Ｄ转换、１０位以上高精度Ｄ／Ａ转换和高精度Ｖ／Ｉ转换的接口技术。同时介绍了利用软定时器实现ＬＥＤ定时动态扫描显示方法。     

Spectral/hp element methods:Recent developments,applications, and perspectives

The spectral/hp element method combines the geometric flexibility of the classical h-type finite element technique with the desirable numerical properties of spectral methods, employing high-degree piecewise polynomial basis functions on coarse finite element-type meshes. The spatial approximation is based upon orthogonal polynomials, such as Legendre or Chebychev polynomials,modified to accommodate a C^0-continuous expansion. Computationally and theoretically, by increasing the polynomial order p,high-precision solutions and fast convergence can be obtained and, in particular, under certain regularity assumptions an exponential reduction in approximation error between numerical and exact solutions can be achieved. This method has now been applied in many simulation studies of both fundamental and practical engineering flows. This paper briefly describes the formulation of the spectral/hp element method and provides an overview of its application to computational fluid dynamics. In particular, it focuses on the use of the spectral/hp element method in transitional flows and ocean engineering. Finally, some of the major challenges to be overcome in order to use the spectral/hp element method in more complex science and engineering applications are discussed.     

Development of a high-precision and wide-range ultrasonic water meter

Ultrasonic water meters offer a number of advantages such as non-intrusiveness, low pressure loss, high accuracy, low power consumption and long service life, which make them a viable option for the next generation of smart water meters. However, the existing ultrasonic water meters have difficulties in balancing the range and accuracy. Therefore, in order to address this issue, this study proposes a novel ultrasonic water meter featured with high-precision and wide-range. First of all, the flow measurement principle of the ultrasonic time difference method is investigated, and a flow measurement model that includes the parameter of radial transit time ($T_D$) is developed. The ultrasonic water meter is designed based on comprehensive consideration of the three aspects of hardware, software and algorithms, and a series of experiments are conducted to verify the performance of the water meter. Eighteen verification test points with the flow range of 0.015–4.509 m³/h are carried out, the results of which suggest that the accuracy level of the ultrasonic water meter reaches 0.5, with the repeatability of 0.09%, and the range ratio of 300:1, indicating the achievement of the design goal of high-precision and wide-range.     

大口径,高精度光学透镜的光胶工艺技术

介绍了大口径、高精度光学透镜光胶对光学元件的技术要求；光胶环境要求；光胶的偏心调整原理及工艺技术方法；并给出了实验结果。     

欧瑞变频器在线切割机床的应用

本文综述了线切割机床的种类、特点和欧瑞线切割机床专用变频器在线切割机床上的具体使用和好处。     

High-precision direct ink writing of Li6.4La3Zr1.4Ta0.6O12

Due to its high ionic conductivity and stability to lithium metal, Li_6.4La₃Zr_1.4Ta_0.6O₁₂ (LLZTO), as an element-doped garnet-type LLZTO material, has become one of the most promising solid electrolyte materials. However, traditional processing technologies of LLZTO materials lack of structural diversity and complexity, and the processing cost is high, making it difficult to be widely used in industrial production. Here, three LLZTO ink formulations are presented which allow for direct ink writing to print complex, cellular 3D structures with an accuracy of 150 µm, including hexagonal honeycombs, triangles and log pile square structures. Based on their tailored rheological properties, such as high modulus G' > 10⁵ Pa, high yield stress σ ≈ 1000 Pa and distinct shear thinning, the inks have excellent printing properties. Based on these inks, LLZTO materials can be printed with three-dimensional freely designable electrolyte structures using common DIW 3D printers.     

三菱运动控制器在机床行业的应用

该文简要分析了我国机床行业及其电控配套的现状，介绍了三菱运动控制产品的特点和它们在机床行业中的一些应用案例。采用多轴运动控制器可实现对机床的高速度和高精度控制。     

高精度零件加工方法探析

以连接件加工为例,介绍了利用通用设备加工高精度零件的多种保证零件精度的方法.并对不同加工方法进行比较,阐述了各种加工方法的优、缺点及适用情况.     

高精度恒温实验室气流模拟分析

借助CFD软件工具，预测高精度恒温房间气流分布的详细情况，通过改变室内各种可能的内扰、边界条件和初始条件，从计算结果中得到全面反映室内气流分布和温度场的变化情况，从而逐步分析以及优化室内的气流分布和温度场，进而指导设计和施工，使室内环境达到良好的空调效果。