一种改进型60GHz双层微带天线的设计与仿真

微带天线和常用的微波天线相比,有体积小、重量轻、低剖面、易共形等特点。但是他的窄频带特性成了限制其广泛应用的主要障碍,因此,展宽微带天线的带宽具有十分重要的意义。本文通过减小介质介电常数,增大介质厚度,并最终采用双层微带天线的方法,设计了一个60GHz的双层微带天线,拓展带宽到6GHz。     

The Comparative Accuracy of Two Hydrologic Models in Simulating Warm‐Season Runoff for Two Small,Hillslope Catchments

This article assesses the performance of two hydrologic models in simulating warm‐season runoff for two upland, low‐yield micro‐catchments near Coshocton, Ohio. The two models, namely the Storm Water Management Model (SWMM) and the Gridded Surface‐Subsurface Hydrologic Analysis (GSSHA), were implemented with contrasting levels of complexity, with the former representing the catchments as lumped spatial units and computing evaporation only from standing water, and the latter incorporating fine‐scale variation in topography and soil properties and computing evapotranspiration from soil based on weather data. Our investigation began with uncalibrated model runs for 1990‐2003 except for 1994 using a priori parameter values. Then a set of calibration experiments were performed wherein the sensitivity of model performance to the length of calibration records was examined. Our results pointed to large errors associated with simulations from both models: even the calibrated models were unable to reproduce the seasonal and between‐catchment contrasts in runoff response. Using a priori parameter values, SWMM attained better results than GSSHA. However, with simple calibration, GSSHA outperformed SWMM in several respects. It was also found that extending the record of calibration rendered relatively minor changes to model performance. The practical and scientific implications of the findings are discussed.     

微污染水体夜间曝气控藻效果研究

设计和开发了一种适用于小城镇的曝气控藻设备,通过底泥围隔实验,研究了夜间曝气对微污染水体的治理效果。结果表明:曝气可以有效抑制氮素循环中反硝化作用和底泥向上覆水中释放磷元素,对氮、磷营养元素的抑制率高达80%;曝气对叶绿素a浓度影响极其显著(p<0.01);曝气能有效抑制藻类增长,并防止围隔内的藻类优势种转变为容易引发"水华"的铜绿微囊藻(Microcystis aeruginosa)。     

曝气条件下微电解-Fenton工艺联合处理模拟染料废水的研究

曝气条件下采用微电解-Fenton工艺处理模拟染料废水。在最佳微电解工艺即铁炭比为45 g∶45 g,pH=3,反应时间为60 min;在Fenton工艺pH值为3,H2O2投加量0.7 mL,反应时间为120 min时,染料废水总脱色率达92%,其色度去除率高于单独微电解工艺时的63%和单独Fenton工艺时的67%。模拟染料废水经微电解及Fenton工艺处理后,废水pH值、Fe2+浓度和色度均发生变化。     

基于S变换的微地震监测中多源信号特征分析

为了提高微地震信号分析的精度,对模拟振动信号进行了试验,得到了时窗因子对ST(S-Transform)时频分辨率的影响,基于ST的良好时窗自适应性和高时频分辨率,进一步将其应用于泸沽铁矿巷道微地震监测数据的处理。结果表明:ST能准确提取信号属性用以构造特征向量,实现了矿山微地震监测中多源信号的量化分类,并为矿山微地震信号的自动识别与分析提出了新思路。     

基于环境安全的微电网技术研究

阐述了环境安全的概念及特征,探讨了我国能源利用给环境安全带来的影响。从环境安全的角度研究了微电网技术发展,重点探讨了微电网产生背景、定义演化过程和微电网发展优势。研究指出,微电网技术发展应尽快制定相关技术标准和实施方案,形成一个环境安全高效灵活的新系统。     

铁炭微电解法降解1-丁基-3-甲基咪唑六氟磷酸盐

使用铁炭微电解法降解1-丁基-3-甲基咪唑六氟磷酸盐([BMIM]PF6),并探讨了铁炭微电解法降解[BMIM]PF6的影响因素、工艺条件及其反应动力学.结果表明,影响铁炭微电解降解[BMIM]PF6的因素按从大到小的顺序为:炭铁比、pH、反应时间;铁炭微电解降解[BMIM]PF6的最佳工艺条件是:铁粉用量3g.l-1、水样pH2.5、炭铁比2、反应时间为60—90min;在此条件下,[BMIM]PF6的去除效率可以达到90%以上且该降解反应为三级反应.     

微絮凝直接纤维过滤去除低浊水中的腐殖质

通过批量和连续动态试验研究了微絮凝直接纤维过滤去除低浊饮用水中微量腐殖质的效能与条件．结果表明,富里酸（ FA） 的去除率与纤维滤料的堆密度、絮凝剂的投加量、过滤速度、原水浊度等有关．对10NTU 以下的模拟低浊水,适宜的纤维堆密度为74.4g/L,滤床高为1.2mｍ ．在此条件下,当过滤速度为30m/h、原水浊度约9NTU 、聚合氯化铝（PAC） 投加量1.75mg/L 时,对水中2mg/L 的FA平均去除率约75 ％ ,工作周期（ 浊度小于0.3NTU 、水头损失小于1.8m ） 在24h以上．     

含油废水处理研究

简要概述了含油废水的特征,介绍了盐析法、絮凝法、电解法、吸附法、浮选法等常规处理含油废水方法及其相应的不足之处,同时介绍了四个处理含油废水的典型流程,并指出了这些传统处理流程的特点及不足之处,重点介绍了微滤、超滤和反渗透等膜分离技术处理含油废水的研究及进展,最后综合阐述了膜分离技术处理含油废水的优点,并指出膜分离技术处理含油废水的研究方向。     

Application of integrated micro sensor in internal measurement of high temperature fuel cell

This study developed an integrated (flow, voltage, and temperature) micro sensor using the micro-electro-mechanical systems (MEMS) technology. It was inserted into the high temperature proton exchange membrane fuel cell (HT-PEMFC) for local real-time measurement. The integrated micro sensor is made of 40 µm thick stainless steel base material, and its protective layer is formed by polyimide (PI) that has better temperature resistance. The integrated micro sensor has three functions, and is favorably characterized by small size, good acid resistance and temperature resistance, quick response, real-time measurement, and being able to be put in any place for measurement. After calibration, and its reliability confirmed, the integrated micro sensor is inserted into the HT-PEMFC for local microcosmic measurement.