矿井水微量油测定研究进展

叙述了矿井水中微量油的危害，分析总结了工业废水中微量油测定的几种方法：紫外分光光度法、红外分光光度法、荧光法和原子吸收分光光度法，并简要概括了这4种方法在测定微量油时的特点。     

点型红外可燃气体探测技术

介绍一种较新的可燃气体探测技术——点型红外可燃气体探测技术,概述了其工作原理(基于气体的光谱本征吸收原理,利用可燃气体吸收特定波段的红外光,通过传感器件接收红外光光通量的物理变化来实现对可燃气体的探测),分析了探测器具体构成(由气体检测单元和信号处理电路单元两部分组成),并给出具体硬件(电源电路、信号放大电路、输出接口电路)设计思路和软件标定算法。     

红外辐射涂料原理和工艺方法研究

从红外辐射机理角度来研究具有建筑隔热保温作用的红外辐射涂料，包括原料的选配和合成工艺方法。     

复燃对氢氧火箭发动机尾焰流场及辐射特性影响数值研究

为深入研究复燃对氢氧火箭发动机尾焰流场及辐射特性的影响,以氢氧发动机喉部截面参数为入口条件,采用耦合Realizable k-ε湍流模型的三维N-S方程,考虑尾焰复燃反应影响,利用PISO算法求解得到尾焰流场参数。在此基础上,通过气体辐射传输方程和大气透过率计算模型SLG对尾焰辐射特性进行计算,对比复燃反应对尾焰流场及其辐射特性的影响。结果表明,复燃反应对氢氧发动机尾焰流场计算影响较大,使温度场以及燃烧产物的质量分数大幅增加,从而导致尾焰的辐射特性增强,因而在氢氧发动机尾焰流场和辐射计算中,考虑复燃反应是极为必要的。     

多喷管液体火箭动力系统尾焰辐射特性研究

为研究多喷管液体火箭动力系统尾焰辐射特性,以液氢/液氧和液氧/煤油发动机组成的多喷管动力系统为模型,采用CFD技术对尾焰流场进行计算,利用气体辐射传输方程和大气透过率计算模型对尾焰辐射特性进行计算,结果表明:复燃反应主要发生在尾焰的边界与空气掺混区域,导致尾焰的辐射特性增强;随着飞行高度及观测角的增加,尾焰辐射特性逐渐增强;可视化计算可以有效捕捉到尾焰流场的结构。     

无损检测技术在陶瓷材料检测中的应用

本文首先简述陶瓷制品的制作要求及材料制作过程中容易产生的缺陷。介绍超声检测、红外热成像检测技术在陶瓷材料检测中的应用。超声检测术适用于检测陶瓷制品生产过程中的各类缺陷;红外成像检测技术更适合工业生产自动化、大批量检测。为今后陶瓷制品的检测及质量把控奠定了基础。     

红外温度测量系统的应用

介绍了红外测温仪在焦炉上的应用,通过在线自动测量迅速反应焦饼温度,对焦炉的热工调节进行指导,同时减轻了操作强度,提高了测量精度,改善了热工调节。     

XX型一次法轮胎成型机胎体供料架共用模板的设计

通过对XX型半钢丝乘用子午线轮胎一次法成型机胎体供料架共用模板传送皮带的安装方式和纠偏装置的设计,从根本上解决了料的跑偏问题;通过活塞式千层辊的应用,对复合料分不同压力滚压,实现了不同厚度料的无缝搭接;增加精确限位装置和抽真空装置,提高了成型后轮胎的质量,并应用气动设计和安保缸等结构保证了模板的安全可靠。     

Microwave dielectric characteristics of tungsten bronze-type Ba4Nd28/3Ti18-yGa4y/3O54 ceramics with temperature stable and ultra-low loss

A series of high-k Ba₄Nd_28/3Ti_18-yGa_4y/3O₅₄ (0≤y≤2, BNTG) ceramics with temperature stable and ultra-low dielectric loss were synthesized via the conventional solid-state reaction. The main phase of all BNTG ceramics demonstrated an orthorhombic tungsten-bronze structure, but the impurity phase (gallium-rich phase) was found in BNTG (y = 2) ceramic. Partial substitution of Ga³⁺ for Ti⁴⁺ in B-site was a valid method to improve the temperature stability and dielectric loss of BNTG ceramics. The variation of ε_r values of BNTG ceramics was dominated by the ionic polarizability. The ultra-low dielectric loss (ultra-high Q × f values) was associated with grain size, suppression of Ti³⁺ and impurity phase. The decrease of TCF values was highly dependent on the tilting of Ti-O octahedra and impurity phase. Finally, outstanding combination dielectric characteristics were achieved for BNTG microwave ceramics at y = 1.5 (ε_r = 72.8, Q × f = 14,600 GHz, TCF=+4.1 ppm/°C) and at y = 2 (ε_r = 70.3, Q × f = 15,500 GHz, TCF=+3.9 ppm/°C).     

Fabrication and investigation of Ca/Tb co-doped HfO2 infrared coatings

In this study, Ca/Tb co-doped HfO₂ coatings were prepared by atmosphere plasma spraying. The chemical composition, morphology and infrared property of the coatings were characterized. The coatings possessed a layer-stacked morphology. When the Ca/Tb doping atomic ratio was 1:1, the phase of the coatings gradually changed from monoclinic to cubic with increasing the doping mass. The CTH2 coating had the highest emissivity which was 0.820 in 0.75–6.5 µm and 0.902 in 6.5–15 µm respectively. The enhancement in short band was mainly due to the introduction of Ca²⁺ and Tb³⁺ ions that generated oxygen vacancies in the lattice forming impurity levels within the forbidden band, moreover, the transfer of Tb³⁺ to Tb⁴⁺ increased the concentration of free electrons, which promoted the absorption of free carriers. The increase in long band attributed to the lattice distortion that reduced the lattice symmetry and strengthened the absorption of lattice polar vibration.