一种高精度RF信号幅相检测电路的设计

本文首先谈论了高精度幅相检测方案的选择,以及带通滤波器的选择和AD8302的主要功能:然后结合f=13.56MH的频率设计了滤波器的参数分析仿真结果:以及AD8302的检测原理的分析.仿真和试验结果证明了这种电路的可行性.     

Nitrogen in SL/RN direct reduced iron: origin and effect on nitrogen control in EAF steelmaking

Abstract

In the steel plant considered here, direct reduced iron (DRI), produced by the coal based Stelco–Lurgi/Republic–National (SL/RN) process, makes up 50% or more of the total iron charge. The SL/RN DRI samples from a kiln cooler had high nitrogen contents (50–250 ppm, depending on particle size), contributing to elevated nitrogen levels in liquid steel produced in the electric arc furnaces. The proposed mechanism of nitriding of SL/RN DRI involves gaseous nitrogen (present within the rotary cooler) diffusing into the solid bed and is supported by a simple diffusion model. A strong correlation was found between the melt-in carbon content of the liquid steel and the final tap nitrogen content, with melt-in carbon of 0·3%C or higher resulting in nitrogen levels below 50 ppm at tap, even when charging DRI material that is high in nitrogen.     

消防设备电源监控传感模块设计

针对市面上消防设备电源监控传感器采样精度差、通信不稳定、不符合国标规范等设计缺陷,以国家标准GB28184-2011《消防设备电源监控系统》为依据研究设计了一款电流电压型监控传感器。设计创新点在于采用RN8209G芯片进行采样,并通过CAN总线进行通信,在0~50 A电流范围内提高采样精度达到1%。设计产品已通过国标GB28184中4.7节表1中的基础实验及高低温试验要求。     

接收机相位差测试系统的设计与实现

同频信号之间的相位差测试是电子测量和信号检测处理的重要内容,在许多领域有着广泛的应用。针对通用检测设备宽范围以及高精度的要求,介绍了一种基于单片集成电路AD8302的接收机相位差测试系统,采用PC104总线结构,具有体积小、结构简单、测量频率范围宽、通用性好等优点,可以用于便携式检测设备中。基于所述方案的相位差测试系统,已经在“便携式雷达性能综合测试仪”实际应用中得到了验证。     

Effect of tumbling and RN genotype on sensory perception of cured-smoked pork loin

Effects of tumbling and RN genotype on sensory perception of cured-smoked loins were studied on loins from 32 crossbred female pigs containing Hampshire blood. Right-side loins were intermittently tumbled during 4 h, whereas left-side loins were left non-tumbled. Tumbled loins were more tender and uniform in cured colour as well as less acidulous in taste compared with non-tumbled loins. Further, the formation of undesirable pores was lower in tumbled loins. Final juiciness tended to be higher and meat taste intensity lower in tumbled loins, whereas initial juiciness did not differ. There were no significant interactions between tumbling and RN genotype for sensory attributes. RN⁻ carriers (RN⁻/rn⁺) were more acidulous in taste, had more pronounced meat taste and were saltier than non-carriers (rn⁺ /rn⁺). Moreover, they tended to have higher initial juiciness and more undesirable pores, and be less homogeneous in cured pink colour. No differences in consumer preference between the four treatments were detected in the ranking test, but most persons ranked non-tumbled loins highest regarding overall liking. Instrumental tenderness measurements agreed well with sensory tenderness scores.     

CC1101无线通信模块的智能开关设计?

为满足智能开关在大型公共建筑物智能用电系统中的功能需要,设计了基于 CC1101无线通信模块的智能开关,介绍了各组成部分的电路原理,利用 STC 单片机全球唯一 ID 研究了一种简单实用的无线组网方法,并详细介绍了电量计量芯片 RN8209G 的校准方法。     

AD8302幅相测量芯片的原理与应用

AD8302是ADI公司生产的用于RF/IF幅度和相位测量的新型芯片 ,可测量两输入信号之间的幅度比和相位差。文中介绍了AD8302的功能及特点 ,给出了此芯片在实际工作中的两种典型测量应用电路。     

Updated estimates of HAL n and RN− effects on pork quality: Fresh and processed loin and ham

A 1000-pig F2 intercross QTL detection experimental population was generated using two commercial sire lines. Independent carriers of HAL n and RN− mutations (10% and 14%, respectively) were included in this population as control genotypes. The effects of HAL n and RN− heterozygous genotypes on fresh and transformed loins and hams were estimated using a mixed model methodology. The results document the unfavorable effects of both mutations on meat quality. Smaller effects of HAL Nn genotype compared to HAL nn or RN−rn+ genotypes were estimated. Interestingly, effects of HAL Nn genotype on meat pH and loin color could be insignificant at 24-h postmortem, but translate into higher water losses on storage and cooking, and result in tougher cooked loin. Using the same methodology, significant effects of the PRKAG3 (RN) I199 allele on ultimate pH values but not on glycolytic potential were observed.     

基于结构的e mail挖掘算法：EHITS*

在总结和分析Web网络中经典的链接分析算法(HITS算法)的基础上,提出了一种从邮件语料中发现全局权威人物的EHITS算法。首先,详细介绍了该算法中选取种子、扩展种子集和迭代计算的方法,并通过实验与其他方法进行了比较;最后,对该算法在安然邮件语料库上的实验结果进行评价。结果表明,该算法在邮件语料库中发现全局权威人物方面是非常有效的。     

新型低成本色散测试仪的研制

介绍了一种新型的基于普通单模光纤的低成本色散测试仪的研制方法,主要讨论了设计原理,硬件电路的实现及实验结果。通过引入波长为1310nm的参考光,不仅以波长间隔大的1310/1550nmWDM(波分复用/解复用器)代替了波长间隔小的1550nm附近的WDM,而且巧妙地消除了系统随机误差,并在软件部分采用自动校准、多次测量求平均值的方法,保证了测量的精度,具有较高的稳定性和抗干扰能力。