含水率对路用水泥混凝土的影响及微波在线测湿系统

在讨论了含水率对路用土质量的影响因素后，通过对不同种类测试器的分析，确定了较为适用的微波传感器，并给出了微波传感器的输出电压与集料含水率之间的关系式，进而对测试准确度进行计算。     

VTS系统中数字微波通信子系统参考标准的探讨

针对船舶交管系统中数字微波通信子系统应用方案进行探讨，通过理论分析和计算，并联系VTS系统实际情况，在数字微波通信子系统工程设计和设备选择方面提出一些建议及参考标准。     

微波通信在铁通城域网建设中的应用

结合铁通通信城域网建设的实际情况,提出了数字微波通信技术在城域网建设中应用的方案.对今后铁通通信网络建设及通信市场的发展有一定的参考价值.     

微波溶样/原子吸收法测定铁路危货站固体废弃物中的重金属

参照美国ＥＰＡＳＷ８４６规定的标准方法，采用Ｑ－４５型微波溶样系统消解样品，原子吸收法测定铁路桃浦危险品货站固体废渣原样、浸滤渣样、浸提液样中的重金属Ｂｅ、Ｃｄ、Ｃｒ、Ｃｕ、Ｎｉ、Ｐｂ、Ｚｎ。研究了样品的消解条件、分析的最佳条件。各元素精密度实验的相对标准偏差在０．５４％～１２．８％，标准土样的测定回收率在７６．４９％～１０３．３３％。并报告了对上海铁路局桃浦危货站现场样品的测定结果。     

Contrasting the direct use of data from traffic radars and video-cameras with traffic simulation in the estimation of road emissions and PM hotspot analysis

This study investigates the effect of traffic volume and speed data on the simulation of vehicle emissions and hotspot analysis. Data from a microwave radar and video cameras were first used directly for emission modelling. They were then used as input to a traffic simulation model whereby vehicle drive cycles were extracted to estimate emissions. To reach this objective, hourly traffic data were collected from three periods including morning peak (6–9 am), midday (11–2 pm), and afternoon peak (3–6 pm) on a weekday (June 23, 2016) along a high-volume corridor in Toronto, Canada. Traffic volumes were detected by a single radar and two video cameras operated by the Southern Ontario Centre for Atmospheric Aerosol Research. Traffic volume and composition derived from the radar had lower accuracy than the video camera data and the radar performance varied by lane exhibiting poorer performance in the remote lanes. Radar speeds collected at a single point on the corridor had higher variability than simulated traffic speeds, and average speeds were closer after model calibration. Traffic emissions of nitrogen oxides (NOx) and particulate matter (PM₁₀ and PM_2.5) were estimated using radar data as well as using simulated traffic based on various speed aggregation methods. Our results illustrate the range of emission estimates (NO_x: 4.0–27.0 g; PM₁₀: 0.3–4.8 g; PM_2.5: 0.2–1.3 g) for the corridor. The estimates based on radar speeds were at least three times lower than emissions derived from simulated vehicle trajectories. Finally, the PM₁₀ and PM_2.5 near-road concentrations derived from emissions based on simulated speeds were two or three times higher than concentrations based on emissions derived using radar data. Our findings are relevant for project-level emission inventories and PM hot-spot analysis; caution must be exercised when using raw radar data for emission modeling purposes.     

微波路径衰落测试

本文通过具体工程实例，介绍了微波路径衰落的测试方法和步骤，以供大家参考。     

Fe(OH)2热解制备γ-Fe2O3

用硫酸亚铁为原料,加NH_3·H_2O得到的氢氧化亚铁作前驱物经干燥后,在有CO_3~(2-)存在下热解可得γ-Fe_2O_3。实验结果显示:前驱物经微波干燥得到的产物分散性比真空干燥法好且粒径减小;而前驱物在无CO_3~(2-)存在时热解产物却为α-Fe_2O_3。并采用XRD、TEM等方法对产物进行了表征。     

Synthesis of Novolacs under Microwave Irradiation

Novolacs were successfully synthesized using oxalic acid as the catalyst in a self-designed device based on a domestic microwave oven, The fundamental characteristics of the synthesis of novolacs under microwave irradiation （MI） were investigated, and the properties of the resins polymerized and dehydrated under microwave irradiation and conventional heating （CH） were analyzed comparatively, The results show that MI reduced the polymerization and dehydration time greatly; and that the resins polymedzed and dehydrated under MI presented longer flow distances （ i. e., higher flowability） and shorter cure time than those obtained under CH.     

微波炉厂微波辐射监测结果分析

对广东三家微波炉厂的生产场所及１５种型号的成品微波炉漏能进行了监测。结果显示：６名检测岗位工人距离微波炉（未上外壳）４０ｃｍ处，微波辐射的功率密度平均为１７μＷ／ｃｍ２（４μＷ／ｃｍ２～６０μＷ／ｃｍ２），仅一个点超标；６种型号（未上外壳）微波炉５ｃｍ处，微波辐射的功率密度平均为１９４μＷ／ｃｍ２（１μＷ／ｃｍ２～１００２μＷ／ｃｍ２），只有一种型号超标；在１５种型号的成品微波炉５ｃｍ处，微波辐射的功率密度平均为１２６μＷ／ｃｍ２（１μＷ／ｃｍ２～８６０μＷ／ｃｍ２），均未超标。微波炉的不同部位微波泄漏主要是视屏窗、门缝的位置。     

微波消解-ICP—MS测定汽车塑料中的汞

为保证人体健康,应严格限制汽车用塑料中汞的含量,采用微波消解技术作为前处理手段,用电感耦合等离子体质谱法（ICP-MS）测定汽车塑料材料中的汞元素。试验中对仪器的参数设置和内标元素进行了优化,考察了微波消解方法与体系的影响。试验证明硝酸／过氧化氢的混和介质能快速有效地消解聚乙烯塑料样品,方法的检出限低,相对标准偏差小,加标回收率高,该方法具有良好的可行性和可靠性。