小孔径蝴蝶型光电导天线太赫兹辐射源的研究

研究了5种小孔径光电导天线的太赫兹发射特性,并且对它们所发射的太赫兹波进行了对比,为研制高效率的太赫兹波发射源提供了参考依据。利用太赫兹时域光谱技术测量了光电导天线发射的太赫兹（THz）脉冲,得到了时域发射光谱,并通过快速傅里叶变换得到相应的频域光谱。结果表明,太赫兹信号强度随偏置电压的增大而增强;随着泵浦激光功率的增大而增强并出现饱和现象。偏置电压与泵浦激光功率相同时,我们对比5种光电导天线产生的太赫兹信号,从中找到了一种发射效率较高的小孔径光电导天线,并且研究了电极形状、电极间距对光电导天线发射效率的     

通过TDS3032B的LAN接口实现信号测量

本文针对如何通过TDS3032B示波器的LAN接口实现网络测量问题,介绍了其LAN接口DHCP、仪器名、用户口令、仪器IP地址、域名、DNSIP地址、网关IP地址、子网模板、Http接口参数的含义、设置方法及利用VISA函数在LabVIEW8。5环境下,实现脉冲参数测量程序设计。该方法利用了仪器本身资源,节约了购买TDS3GV模块几千元的经费,达到了通过GPIB控制示波器的同样效果,读者可以直接利用程序中的原代码,避免程序设计中繁琐调试过程,对程序设计者具有很高参考借鉴价值。     

热脱附谱方法的脱附速率灵敏度与四极质谱仪参数关系的实验研究

为了获得热脱附谱（TDS）方法的脱附速率灵敏度与四极质谱仪（QMS）参数的关系,以优化TDS高灵敏度分析的条件和参数,采用一种特制的通导型校准漏孔,基于QMS对氢同位素释放速率的二次离子检测（SEM）模式,研究了QMS仪器参数对TDS氘气脱附速率灵敏度的影响规律。实验结果表明,QMS的参数对TDS的氘气脱附速率灵敏度具有明显的影响,获得了实现TDS高灵敏度分析的QMS参数范围：发射电流1 000~1 400 μA;离子能量（栅极电压）3~3.5 V;电子能量50~70 V;聚焦电压-100~-60 V;分辨率-5~+5。     

一种双极性调制SPWM逆变器的研究与设计

介绍了一种正弦波逆变器的研究与设计,其主要原理是把直流电压经升压斩波电路变换到另外一种直流电压,再经H桥逆变电路逆变成所需的正弦波交流电。其中升压斩波电路采用PWM控制芯片SG3525作为主控芯片,而H桥逆变电路采用纯正正弦波逆变控制芯片TDS2285作为主控芯片。并针对死区电路、驱动电路进行了合理的设计,使逆变器运行安全高效。     

The temporality of eating behavior as a discriminant tool to characterize consumers: Temporal Dominance of Behavior applied to bread consumption during a restaurant meal in France

Video observation is gaining popularity as a data collection technique to study eating behavior. Traditional approaches to data analysis of video observations are based on static counts reporting the number of times an action occurs, disregarding the dynamic aspects captured in the video. In this paper, we investigate French consumers’ bread consumption patterns during a restaurant meal. We propose a novel approach, the Temporal Dominance of Behavior (TDB), to visualise the dynamic information contained in video material in terms of frequency, duration, sequence and simultaneity of actions based on standard data analysis principles from temporal methods such as Temporal Dominance of Sensations (TDS) and Temporal Check-All-That-Apply (T-CATA). TDB allows reporting hours of videos across several subjects in a single graphical output, providing an efficient summary overview suitable for results interpretation and communication.Regarding bread consumption patterns during a restaurant meal in French consumers, three groups of consumers are drawn: the No-breaders (43%), the Bread-as-a-tool group (48%) and the Bread lovers (9%). Eating behavior varies in the consumed quantity of bread as well as in consumption dynamics throughout the meal, and it is related to both the type of dish that is consumed and to consumer characteristics. The Temporal Observation Curves approach provides a graphical synthesis of the dynamic information.We discuss the added-value of the TDB method compared to single-point analysis, provide recommendations for future developments and suggest potential applications in the consumer and food domain.     

地浸采铀监测井的取样方法与监测结果分析

讨论了地浸采铀中监测井的数量及其影响因素 ,同时 ,还介绍了取样方法、样品处置、指示参量的选择及监测结果的处理     

塔里木盆地南缘地下水勘查EH-4系统应用效果

通过塔里木盆地南缘干旱地区地下水勘查EH-4电导率成像系统应用与示范,总结出示范区第四系孔隙水不同分带区水文地质特征,建立了地层电阻率与地下水矿化度和岩性结构的变化关系,提出了盆地周缘地下水勘查物探技术的应用条件,为西北干旱地区地下水勘查提供了经验。     

Total dissolved solids removal by electrochemical ion exchange (EIX) process

In the present investigation, synthetic wastewater was prepared by the addition of required amount of salts into deionized water. Their performance, on removal of Cl⁻, SO₄²⁻, PO₄³⁻, Ca²⁺, Fe²⁺ and Mg²⁺ in laboratory scale plate and frame type electrochemical ion exchange (EIX) cells, were evaluated under varying operating conditions. Ruthenium dioxide coated titanium plates (RuO₂/Ti) were used as anode and stainless steel plates as cathode in all the four different EIX cells used in the present investigation. All the four EIX cells were run for a maximum of 7 h. Almost complete removal of all the above ionic solids were observed within 4.5-7 h under one or more test conditions.     

Data monitoring system of technical diagnosis system for EAST

<正>Technical diagnosis system(TDS)is an important subsystem to monitor status parameters of EAST (experimental advanced superconducting tokamak).The upgraded TDS data monitoring system is comprised of management floor,monitoring floor and field floor.Security protection,malfunction record and analysis are designed to make the system stable,robust and friendly.During the past EAST campaigns,the data monitoring system has been operated reliably and stably.The signal conditioning system and software architecture are described.     

Soft Sensor design for a Topping process in the case of small datasets

In this paper, a new strategy to cope with the identification of nonlinear models of industrial processes, when a limited number of experimental data is available, is proposed. The approach is intended to improve the generalization capabilities of the model and it is based on the integration of bootstrap resampling, noise injection and neural model stacking. A number of algorithms to stack the first level neural models are also compared. The method proposed has been applied to develop a Soft Sensor for the estimation of the Freezing Point of Kerosene in an atmospheric distillation unit (Topping) working in a refinery in Sicily, Italy. The improvements obtained thanks to the strategy proposed, with respect to a classical neural model, are shown in the paper.