In order to build method for measuring of elements in honey, the contents of Ba, Cu, Pb, Cd, As, Hg, Cr, Mn, Se had been determined by microwave diges- tion （MWD） and actively coupled plasma atomic emission spectrom...In order to build method for measuring of elements in honey, the contents of Ba, Cu, Pb, Cd, As, Hg, Cr, Mn, Se had been determined by microwave diges- tion （MWD） and actively coupled plasma atomic emission spectrometry （ICP-AES）. The results show that, the range of heavy metal elements were in the range of 0- 10.0 mg/L, with good linear relationship. In addition, all correlation coefficients kept higher than 0.999, and the recovery rate of ample added with standard solution was in 94.1%-110%. By comparison with the result of chemical experiment, the method was quickly accessible and convenient, widely used in the measurement of elements in honey, with satisfactory results.展开更多
In order to develop a method for measuring of elements in Sipunculus nudus, the contents of Cu, Pb, Cd, Cr, Mn, As, Hg and Ba were determined by actively coupled plasma atomic emission spectrometry （MWD） and microwa...In order to develop a method for measuring of elements in Sipunculus nudus, the contents of Cu, Pb, Cd, Cr, Mn, As, Hg and Ba were determined by actively coupled plasma atomic emission spectrometry （MWD） and microwave digestion （ICP-AES）. The results showed that correlation coefficients al kept higher than 0.999 and the recovery rates of sample added standard solutions were in 98%-114%. The results indicated that the contents of Cu, Pb, Cd, Cr, Mn, As, Hg and Ba were 17.119, 3.781, 0.695, 7.351, 1997.982, 0.620, 0.144, 4.249 mg/kg respectively. The contents of Mn exceeded national limit by hundredfold, Cd sevenfold, Pd fourfold, Cd three-and-a-half-fold, and As onefold. Sipunculs nudus became seriously pol uted. Therefore, it is necessary to formulate robust policies to fol ow closely and pay close attention to coastal areas pol ution around Dongfang City.展开更多
无线随钻测量MWD(Measurement While Drilling)利用泥浆脉冲进行信号的传输可以实时观测井底的相关数据,地面解码系统对接收到的泥浆脉冲信号进行正确的检测与识别是随钻测量的核心技术之一。然而,信道中存在的各种噪声会对信号的传输...无线随钻测量MWD(Measurement While Drilling)利用泥浆脉冲进行信号的传输可以实时观测井底的相关数据,地面解码系统对接收到的泥浆脉冲信号进行正确的检测与识别是随钻测量的核心技术之一。然而,信道中存在的各种噪声会对信号的传输与识别造成干扰与误码。首先对曼彻斯特编码泥浆脉冲信号的噪声进行了分析,在此基础上将归一化最小均方(NLMS)自适应滤波算法去除泥浆脉冲信号的噪声,与传统滤波方法相比,NLMS自适应滤波算法能更有效的去除各种噪声并能有效的消除泵冲基值对波形的影响。然后针对得到的去噪泥浆脉冲信号的特点,建立泥浆脉冲识别模型,将聚类识别算法应用到了泥浆脉冲信号的识别。最后现场试验结果表明,该解码过程简单实用,具有可靠性高、误码率低等特点,符合工程应用的要求。展开更多
遥传技术是随钻测量(MWD,measurement while drilling)系统中的一项关键技术,目前大多数MWD系统均采用泥浆脉冲方式进行数据传输。随着井深的增加,单纯的脉冲调制的传输性能会快速恶化。提出了一种联合卷积编码与脉冲间隔调制,构造出一...遥传技术是随钻测量(MWD,measurement while drilling)系统中的一项关键技术,目前大多数MWD系统均采用泥浆脉冲方式进行数据传输。随着井深的增加,单纯的脉冲调制的传输性能会快速恶化。提出了一种联合卷积编码与脉冲间隔调制,构造出一种网格编码脉冲间隔调制(TC-PIM)方法。TC-PIM最大化调制输出序列之间的最小时间距离,从而获得显著的编码增益。TC-PIM可以用于随钻测量系统,以提高泥浆脉冲遥传系统的传输距离。展开更多
文摘In order to build method for measuring of elements in honey, the contents of Ba, Cu, Pb, Cd, As, Hg, Cr, Mn, Se had been determined by microwave diges- tion （MWD） and actively coupled plasma atomic emission spectrometry （ICP-AES）. The results show that, the range of heavy metal elements were in the range of 0- 10.0 mg/L, with good linear relationship. In addition, all correlation coefficients kept higher than 0.999, and the recovery rate of ample added with standard solution was in 94.1%-110%. By comparison with the result of chemical experiment, the method was quickly accessible and convenient, widely used in the measurement of elements in honey, with satisfactory results.
文摘In order to develop a method for measuring of elements in Sipunculus nudus, the contents of Cu, Pb, Cd, Cr, Mn, As, Hg and Ba were determined by actively coupled plasma atomic emission spectrometry （MWD） and microwave digestion （ICP-AES）. The results showed that correlation coefficients al kept higher than 0.999 and the recovery rates of sample added standard solutions were in 98%-114%. The results indicated that the contents of Cu, Pb, Cd, Cr, Mn, As, Hg and Ba were 17.119, 3.781, 0.695, 7.351, 1997.982, 0.620, 0.144, 4.249 mg/kg respectively. The contents of Mn exceeded national limit by hundredfold, Cd sevenfold, Pd fourfold, Cd three-and-a-half-fold, and As onefold. Sipunculs nudus became seriously pol uted. Therefore, it is necessary to formulate robust policies to fol ow closely and pay close attention to coastal areas pol ution around Dongfang City.
文摘无线随钻测量MWD(Measurement While Drilling)利用泥浆脉冲进行信号的传输可以实时观测井底的相关数据,地面解码系统对接收到的泥浆脉冲信号进行正确的检测与识别是随钻测量的核心技术之一。然而,信道中存在的各种噪声会对信号的传输与识别造成干扰与误码。首先对曼彻斯特编码泥浆脉冲信号的噪声进行了分析,在此基础上将归一化最小均方(NLMS)自适应滤波算法去除泥浆脉冲信号的噪声,与传统滤波方法相比,NLMS自适应滤波算法能更有效的去除各种噪声并能有效的消除泵冲基值对波形的影响。然后针对得到的去噪泥浆脉冲信号的特点,建立泥浆脉冲识别模型,将聚类识别算法应用到了泥浆脉冲信号的识别。最后现场试验结果表明,该解码过程简单实用,具有可靠性高、误码率低等特点,符合工程应用的要求。
文摘遥传技术是随钻测量(MWD,measurement while drilling)系统中的一项关键技术,目前大多数MWD系统均采用泥浆脉冲方式进行数据传输。随着井深的增加,单纯的脉冲调制的传输性能会快速恶化。提出了一种联合卷积编码与脉冲间隔调制,构造出一种网格编码脉冲间隔调制(TC-PIM)方法。TC-PIM最大化调制输出序列之间的最小时间距离,从而获得显著的编码增益。TC-PIM可以用于随钻测量系统,以提高泥浆脉冲遥传系统的传输距离。
