火焰原子吸收光谱法测定锁阳中15种金属元素含量

采用浓硝酸-高氯酸(φ∶4∶1)常压微沸条件下消解锁阳样品,应用火焰原子吸收法测定了锁阳中的金属元素Na, K, Mg, Ca, Cu, Zn, Fe, Co, Ni, Mn, Pb, Cr, Cd, Au, Ag含量,研究了测定不同元素的仪器最佳工作条件、方法的准确性和精密度。结果表明,锁阳中Na, K, Mg, Ca, Fe, Zn,Cu, Mn, Pb, Ni, Ag含量分别为13 572.0, 14 260.0, 358.3, 168.3, 238.5, 19.4, 5.9, 3.4, 2.6, 1.3, 0.4 μg·g-1, Co, Cr, Cd, Au未检出。方法的加标回收率为97.8%～104.5%, 相对标准偏差(n=9)为0.2%～5.0%。测定方法简单易行,方便快捷,结果令人满意。     

新疆野生樱桃李及栽培品种果肉中17种元素含量ICP-MS法测定

比较紫色,红色和黄色三种新疆野生樱桃李及栽培品种果肉中无机元素的含量,样品采用微波消解方法进行前处理,ICP-MS法检测其中K,Ca,Mg,Na,Fe,Mn,Cu,Zn,Be,Li,Se,Sr,Cr,Pb,Cd,As,Hg等17种元素。该检测方法快速简便,精密度高且具有较高的灵敏度,17种元素的加标回收率在93.5%～110.4%。分析结果表明紫色,红色和黄色三种新疆野生樱桃李及栽培品种果肉中的17种元素含量均较为接近,均含有极为丰富的K元素,含量高达1‰左右,Ca,Mg,Na,Fe,Mn均为含量较高的金属元素且含量依次降低,Cu,Zn,Li,Se,Sr,Cr也有一定含量,Pb,Cd,As,Hg等有害元素含量极低或未检出。实验结果为研究新疆野生樱桃李与栽培品种果肉中微量元素含量提供参考数据。     

Mo XIV离子精细结构能级和辐射寿命

用全相对论多组态自洽场方法 ,计算了类铜离子MoXIV的 1s ,2s ,2p- ,2p ,3s,3p- ,3p ,3d- ,3d ,4s,4p- ,4p ,4d- ,4d ,4f- ,4f,5s,5p- ,5p ,5d- ,5d ,5f- ,5f ,5g- ,5g ,6s,6p- ,6p ,6d- ,6d ,6f- ,6f,6g- ,6g ,6h- ,6h ,7s,7p- ,7p ,7d- ,7d ,7f- ,7f,7g- 和 7g轨道的 15 0 8个精细结构能级和辐射寿命以及其它各种跃迁参数 ,能级的计算值和实验值符合得很好 .另外还发现了一些寿命较长的能级. Energy levels, radiative lifetime and various transition parameters for allowed transitions among the 1 508 fine-structure levels belong to the (1s 22s 22p 63s 23p 6) 3d 104l, 3d 94l 2, 3d 105l, 3d 94l4m, 3d 106l, 3d 107l and so on configurations of the Cu-like ions Mo XIV have been calculated by using the expanded fully relativistic GRASP code. The results are compared with those available in the literature, and the accuracy of the present data is assessed. En...     

2009年全国高考理综（甲、乙卷）物理试题评析

1 总体评价 2009年全国高考(非课改区)理科综合物理试卷共两套,其中:甲卷供云南,贵州,黑龙江,吉林,甘肃,新疆,内蒙古,青海,西藏等省、自治区使用;乙卷供湖北,湖南,河北,河南,山西,陕西,江西,广西等省、自治区使用.     

AUTHOR INDEX TO VOLUME2,2004

Hongjian,171Ablekim,414Aeharya,12lbrsunjanSeeMije七i,Palihati,Chen*Chunhan;Cao,Mingeui;andLuo,ZhixiangPerformanee analysis of oPti-Cui,Cui,Cui,Cul,Haoyang see Li,Houxin see Chen叭飞nliang,411H .N.see Wh七ekar,Pramod R.eal burst switehingunder bursty tra用e,21Ni see Li,Jingjuan,725YIPing seew胡g,Zhuyuan,480An,JunmingXia,Junlei;Li,and Hu,Xionganalysis for lowwaveguides,456Li,Jian;Gao,Dingshan;Jianguang;叭relDesignbirefringenee、丫hng,Hongjie: and numerieal凡iliea on siliConChen…     

内蒙古兴和县育龄妇女头发中矿质元素分布及影响因素研究

使用电感耦合等离子体原子发射光谱(ICP-AES)和原子荧光光谱法(AFS)分别对内蒙古自治区兴和县180名农村育龄妇女头发中21种矿物元素(铝,硼,钡,钙,镉,钴,铬,铜,铁,镁,锰,钼,镍,铅,硒,硅,锡,锶,钛,钒和锌)的含量及年龄、生育史及饮食习惯等对其产生的影响进行了研究。结果表明,大多数矿物元素(硼,镉,铬,钴,铜,铁,镁,锰,钼,镍,铅,硒,硅,锡,锶,钛,钒和锌)含量从青年组(18～29岁)到老年组(40～45岁)依次减少,而中年组(30～39岁)的钙,镁,锰、铅的含量最低。生育二胎的妇女钙,镁,锰,钼,镍,铅,锡,锶和锌含量最低,这可能与生育次数的增加有关,相关性分析证实钙,铅和锡与生育史有显著性相关。此外,饮食习惯也会影响头发中矿物质元素的含量。经常食用酸菜会导致锌,铁,铜,锰,锶含量水平较低,但钼,铅和硒含量水平较高。而且,锌和硒含量随肉类摄入频率增加而增加。规律性摄入蔬菜会增加硅的含量。同时,经常食用水果会增加锰,镍和钛的含量水平。因此,该研究为解决不均衡饮食习惯盛行的农村地区生育和妇女健康提供基础数据和有用的信息。     

物理学咬文嚼字之九十七

Conceive,concept,conceptive,conception,conceptual,conceptualize,conceptualization,conceptualism,conceptualistic等等,这一堆乱麻,岂一个"概念"了得?     

ICP-MS法测定苦杏仁中微量元素的研究

建立了电感耦合等离子体质谱(ICP-MS)法测定用HNO3+H2O2混合酸经微波消解处理苦杏仁样品中B,Na,Mg,Al,P,K,Ca,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Se,Rb,Sr,Mo,Cd,Ba,Pb等24种微量元素的分析方法,优化了仪器的最佳工作条件。通过添加标准进行加标回收,结果表明,24种待测微量元素的相对标准偏差(RSD)均小于4.79%,回收率在90.00%～109.30%之间。该法具有准确度高、精密性好、并能同时进行多种元素测定等优点,该法可为苦杏仁中无机元素的快速检测提供科学依据。     

1980年7月—12月原子光谱文献分类索引

一一f一一一一一一一了文献题录8134一8590的分类索引。按应用分类和按元素字母顺序分类。 应用分类索引农业植物一8169(Pb),5216又AI),521了,5236(As, Sb),8285,8286(Ca.K,Mg,P),829组(AI, Ba,Be,Ca,Cd,Cr,Cu,Fe,Mn,P,pb,Sr, Zn),8310,8391(Ag,AI,Ba,Co,Cr,Cu, Fe,Mg,Mn一Mo,Ni,51,Sn,Sr,Ti,V, Zn),8396(CI),8406(Ge),8419(Sb), 8482(K),8516,8554,5573(Cd,Co,Cr, Cu,Ni,孙,Zn),8579(Cd)土壤一8151(Pb),8155(AI,Fe),8233(Mn), 8255(Ca,K,Mg,P),8266(Hg),8271(Cd, Pb),8274(Cu,Fe,Mn,Zn),8296(Ca,K, Mg,P),830…     

微波消解/ICP-MS法测定二色补血草中27种元素

采用微波消解及ICP-MS,建立了一种测定二色补血草中Be,B,Na,Al,Mg,P,K,Ca,V,Cr,Mn,Fe,Co,Ni,Cu, Zn,Ga,As,Se,Sr,Mo,Cd,Ba,La,Hg,Pb和Th共27种元素的方法.实验采用国家一级标准物质茶叶(GBW-07605)评价了方法的准确性,通过在线加入Ge,In和Bi三种元素内标液的方法来校正由于基体效应和信号漂移对测量所造成的影响.方法的回收率为92.4%～107.2%,相对标准偏差为1.5%～9.7%,检出限为0.002～0.081 μg·L-2,元素的测定结果表明:二色补血草中含有丰富的Na,K,Ca,Mg和P等常量元素,Fe,Mn,Zn,Cr和Cu等微量元素.实验结果为深入研究二色补血草无机元素与药效的相关性提供了参考数据.     

双模式高精度可调超分辨光瞳滤波器

基于双折射波片的特性,提出了一种具有双调节模式的连续可调超分辨光瞳滤波器。该滤波器通过两种调节模式实现超分辨,且在一定范围内连续可调。在横向旋转模式下,该滤波器为复振幅型光瞳滤波器,纵向倾斜模式下为纯相位型超分辨滤波器。通过对超分辨参量的分析,得到最佳设计参量,可以实现大的视场角,大的超分辨范围、高的调节精度。这种滤波器为实际应用提供了更多的方便。     

高温超导窄带广义切比雪夫函数滤波器

提出了一种用于高温超导滤波器制作的新结构——窄带广义切比雪夫函数高、低通滤波器级联方式．该方式利用高温超导低插损特性，可以有效地降低极陡峭广义切比雪夫函数低通、高通滤波器的带边频滚降．依靠高、低通滤波器级联方式构建新形式的窄带极陡峭低插损高温超导滤波器．并与已有高温超导滤波器进行了比较分析．     

一种级联马赫-曾德尔滤波器设计的新方法

级联马赫—曾德尔干涉仪滤波器可实现平顶化的滤波器频谱响应,但是利用传统的传输矩阵法。并不能方便地得到级联马赫—曾德尔干涉仪滤波器中各耦合器的耦合系数。将级联马赫—曾德尔干涉仪滤波器与数字信号处理中的有限脉冲响应滤波器进行了类比,并将数字滤波器的设计方法引入到级联马赫—曾德尔干涉仪滤波器的设计中,将滤波器的传输函数表示成为各耦合器耦合系数的显式函数,同时利用遗传算法,计算了对于给定的滤波器频谱响应,级联马赫—曾德尔干涉仪光滤波器中各耦合器的耦合系数。通过实例证明了利用数字滤波器的设计方法及遗传算法设计级联马赫—曾德尔干涉仪光滤波器,不仅可以得到理想的结果,而且可以提高光滤波器的设计效率。     

一种带有陷波单元的高温超导滤波器设计

提出了一种带有陷波单元的新型高温超导滤波器设计结构,在输入、输出馈线附近设置陷波单元对特定频率产生陷波作用,在滤波器的传输特性上成传输零点,提高了滤波器设计的灵活性,基于这种新型结构设计了高边缘陡峭度滤波器和邻频双通带滤波器.     

三区复振幅光瞳滤波器

利用光瞳滤波器来改变光在焦斑处的分布,是实现光学超分辨的有效途径。由于受到制作上的影响,现有的光瞳滤波器大都是纯相位型或者纯振幅型的。与纯相位或者纯振幅型光瞳滤波器相比较,复振幅型光瞳滤波器能够实现更好的滤波效果。不过由于制作上的困难,影响了复振幅的光瞳滤波器在实际中的应用。为此给出了一种相对容易实现的复振幅型光瞳滤波器,通过计算表明：在横向具有相同的第一零点比和斯特雷尔比下,该复振幅型光瞳滤波器的旁斑强度比优于纯相位型光瞳滤波器50％,并且有效地降低了纯相位型光瞳滤波器的轴向加宽。     

A new shunt DC active filter of power supply in a steady high magnetic field facility

A DC active power filter is an indispensable part in a high power and high stability power supply system, especially in the power supply system of the Steady High Magnetic Field Facility, which requires that the current ripple should be limited to 50 parts per million. In view of the disadvantages of the series DC active power filter and shunt Pulse Width Modulation DC active filter, this paper puts forward a novel DC active filter by combining the advantages of the transistor regulator and the shunt type. The structure and principle of the new shunt linear active filter are introduced. Meanwhile, the design of several key components that construct the new shunt linear active filter is also analyzed. The simulation model and an experimental prototype of the shunt linear active filter are developed, and the results verify that the parameter design is reasonable and the shunt active filter has a good filter effect.     

Performance analysis of WDM-PON architecture using different receiver filters

In this paper the performance effect of a 40 Gb/s Wavelength-Division-Multiplexed Passive Optical Network (WDM-PON) is analyzed using different receiver filters namely Integrator filter, Bessel filter, Butterworth filter, Chebyshev filter, Inverse Chebyshev filter, Elliptic filter, Gaussian filter and Rectangular filter. The data rate and channel spacing are taken as 10 Gb/s per channel and 100 GHz, respectively. Among all the investigated filters, Bessel filter is considered to be the best one for WDM-PON network by the obtained BER and Q factor values.     

光学小波匹配滤波器与图形识别

小波变换弥补了傅里叶变换的不足，在信号及图像处理方面具有广阔的应用前景。文章深入讨论了小波变换匹配滤波器的理论基础及光学实现方法，并将其用于图形识别，给出了计算机模拟结果，与传统的匹配滤波器进行了比较，证实了小波变换在光学信息处理中的优越性。     

Denoising 3D MR images by the enhanced non-local means filter for Rician noise

The non-local means (NLM) filter removes noise by calculating the weighted average of the pixels in the global area and shows superiority over existing local filter methods that only consider local neighbor pixels. This filter has been successfully extended from 2D images to 3D images and has been applied to denoising 3D magnetic resonance (MR) images. In this article, a novel filter based on the NLM filter is proposed to improve the denoising effect. Considering the characteristics of Rician noise in the MR images, denoising by the NLM filter is first performed on the squared magnitude images. Then, unbiased correcting is carried out to eliminate the biased deviation. When performing the NLM filter, the weight is calculated based on the Gaussian-filtered image to reduce the disturbance of the noise. The performance of this filter is evaluated by carrying out a qualitative and quantitative comparison of this method with three other filters, namely, the original NLM filter, the unbiased NLM (UNLM) filter and the Rician NLM (RNLM) filter. Experimental results demonstrate that the proposed filter achieves better denoising performance over the other filters being compared.     

Design of a Composite Wavelet Matched Filter Using Breeder Genetic Algorithm

We outline a method to design a composite wavelet matched filter using the breeder genetic algorithm. The composite filter consists of a linear combination of wavelet and matched filters. Breeder genetic algorithm has been used to find the optimal weighting coefficients for the wavelet and the matched filters that constitute the composite filter. For the breeder genetic algorithm, the geometric mean has been used as the crossover operator and the creep has been used as the mutation operator. The performance of the filter is tested in the presence of additive white Gaussian noise. The performance of the composite wavelet matched filter has also been compared with that of the phase only filter and the classical matched filter. The designed filter can be used in an optical correlator to separate two classes of input images for fingerprint-based user identification in security systems.