微波辐射全氟磺酸树脂催化合成柠檬酸三丁酯的研究

以柠檬酸和正丁醇为原料,废弃的全氟磺酸树脂为催化剂,在微波辐射条件下合成柠檬酸三丁酯,对影响合成柠檬酸三丁酯的因素进行研究。结果表明：微波辐射条件下,醇酸摩尔比为6：1、催化剂用量为0．315g、微波辐射时间为40min、微波辐射功率为500W,柠檬酸三丁酯的最高产率可达93．9％。该催化剂绿色环保且易于回收,重复使用六次以上产率仍可达到90％以上。     

强流辐照飞机压气机叶片表层成分分析

在加速电压250 kV、束流密度80 A/cm2和150 A/cm2、脉宽40 ns的强流脉冲离子束辐照下,钛基合金叶片表层烧蚀效果显著.对辐照试样表面进行了卢瑟福背散射(RBS)和能量色散的特征X射线谱(XEDS)分析,结果发现辐照后试样表面成分发生改变,其中Mo元素在表面发生明显的富集现象.Al、Mo元素含量的变化可能导致钛合金相结构的改变,从而影响叶片的某些力学性能.     

Muscle morphology of the vastus lateralis is strongly related to ergometer performance,sprint capacity and endurance capacity in Olympic rowers

Rowers need to combine high sprint and endurance capacities. Muscle morphology largely explains muscle power generating capacity, however, little is known on how muscle morphology relates to rowing performance measures. The aim was to determine how muscle morphology of the vastus lateralis relates to rowing ergometer performance, sprint and endurance capacity of Olympic rowers. Eighteen rowers (12♂, 6♀, who competed at 2016 Olympics) performed an incremental rowing test to obtain maximal oxygen consumption, reflecting endurance capacity. Sprint capacity was assessed by Wingate cycling peak power. M. vastus lateralis morphology (volume, physiological cross-sectional area, fascicle length and pennation angle) was derived from 3-dimensional ultrasound imaging. Thirteen rowers (7♂, 6♀) completed a 2000-m rowing ergometer time trial. Muscle volume largely explained variance in 2000-m rowing performance (R² = 0.85), maximal oxygen consumption (R² = 0.65), and Wingate peak power (R² = 0.82). When normalized for differences in body size, maximal oxygen consumption and Wingate peak power were negatively related in males (r = ?0.94). Fascicle length, not physiological cross-sectional area, attributed to normalized peak power. In conclusion, vastus lateralis volume largely explains variance in rowing ergometer performance, sprint and endurance capacity. For a high normalized sprint capacity, athletes may benefit from long fascicles rather than a large physiological cross-sectional area.     

Wavelength Dependence of Light Induced Changes in Reflectance Spectra of Selected Dyes and Pigments

Historical objects in exhibitions can be subject to light induced damages resulting in a shift of color and brightness. Besides certain ambient influences the main factor governing these effects is the spectral irradiance applied to the surface. As the photochemical efficiency of electromagnetic radiation depends on its wavelength it is desirable to know the effect of individual spectral components in order to estimate the damage potential of a certain light source. In this work the modifications of the reflectance spectra of 40 dyes and pigments relevant in historical book illumination resulting from irradiation by eight narrow band LED light sources are presented. The LED wavelengths cover the visible part of the electromagnetic spectrum. Based on the measured reflectance spectra, color values are calculated and their evolution is studied as a function of the amount of radiation applied.     

电、磁、超声复合场在景观水处理方面的应用研究

阐述了景观水污染特点及危害,介绍电、磁、超声复合场在景观水处理方面的实验研究,研究结果表明其能有效地杀菌灭藻,是一种新型的景观水处理方法.     

Ultrasound imaging in medical student education: Impact on learning anatomy and physical diagnosis

Ultrasound use has expanded dramatically among the medical specialties for diagnostic and interventional purposes, due to its affordability, portability, and practicality. This imaging modality, which permits real‐time visualization of anatomic structures and relationships in vivo, holds potential for pre‐clinical instruction of students in anatomy and physical diagnosis, as well as providing a bridge to the eventual use of bedside ultrasound by clinicians to assess patients and guide invasive procedures. In many studies, but not all, improved understanding of anatomy has been demonstrated, and in others, improved accuracy in selected aspects of physical diagnosis is evident. Most students have expressed a highly favorable impression of this technology for anatomy education when surveyed. Logistic issues or obstacles to the integration of ultrasound imaging into anatomy teaching appear to be readily overcome. The enthusiasm of students and anatomists for teaching with ultrasound has led to widespread implementation of ultrasound‐based teaching initiatives in medical schools the world over, including some with integration throughout the entire curriculum; a trend that likely will continue to grow. Anat Sci Educ 10: 176–189. © 2016 American Association of Anatomists.     

回转窑运行状态监测系统人机界面的设计

针对回转窑运行过程中出现的问题,提出了一种利用超声波传感器对窑体回转误差进行检测,并通过单片机将数据传送给PC机,实现监测回转窑运行状态的设计方案。详细阐述了监测系统人机界面的构建过程及界面程序,为现场技术人员了解回转窑的运行情况提供了直观、有效的帮助。     

基于多系统融合的超声远程教学平台的初步设计与应用

探讨一种基于多系统融合的超声远程教学平台,该平台将音频信号、视频信号及摄像三种现场信号同时进行高效率的采集编码,实现远程直播,并同步实现语音识别生成字幕。我们在开发超声远程教学平台的同时,利用其优势,强化教学及远程的"会诊"作用,取得了很好的实践效果。     

微波辐射加热制备半导体ZnS纳米粒子

在甲醛溶液中，以Zn(Ac)2和TAA为源材料，通过微波辐射加热合成了ZnS半导体纳米粒子，并用XRD、TEM、紫外反射光谱进行了表征。     

微波辐射下淀粉丙烯酸接枝共聚反应

在微波辐射下探讨了玉米淀粉与丙烯酸流变相态的接枝共聚反应，考察了辐射时间、淀粉预糊化温度、引发剂浓度、丙烯酸中和度等因素对聚合反应及聚合物吸水率的影响．结果显示，微波辐射可以得到较高接枝率的玉米淀粉丙烯酸共聚物．