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.     

Set the controls for the heart of the Sun

In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required.     

On the reversibility of the Meissner effect and the angular momentum puzzle

It is generally believed that the laws of thermodynamics govern superconductivity as an equilibrium state of matter, and hence that the normal-superconductor transition in a magnetic field is reversible under ideal conditions. Because eddy currents are generated during the transition as the magnetic flux changes, the transition has to proceed infinitely slowly to generate no entropy. Experiments showed that to a high degree of accuracy no entropy was generated in these transitions. However, in this paper we point out that for the length of times over which these experiments extended, a much higher degree of irreversibility due to decay of eddy currents should have been detected than was actually observed. We also point out that within the conventional theory of superconductivity no explanation exists for why no Joule heat is generated in the superconductor to normal transition when the supercurrent stops. In addition we point out that within the conventional theory of superconductivity no mechanism exists for the transfer of momentum between the supercurrent and the body as a whole, which is necessary to ensure that the transition in the presence of a magnetic field respects momentum conservation. We propose a solution to all these questions based on the alternative theory of hole superconductivity. The theory proposes that in the normal-superconductor transition there is a flow and backflow of charge in direction perpendicular to the phase boundary when the phase boundary moves. We show that this flow and backflow explains the absence of Joule heat generated by Faraday eddy currents, the absence of Joule heat generated in the process of the supercurrent stopping, and the reversible transfer of momentum between the supercurrent and the body, provided the current carriers in the normal state are holes.     

Adam and the Ants: On the Influence of the Optimization Algorithm on the Detectability of DNN Watermarks

As training Deep Neural Networks (DNNs) becomes more expensive, the interest in protecting the ownership of the models with watermarking techniques increases. Uchida et al. proposed a digital watermarking algorithm that embeds the secret message into the model coefficients. However, despite its appeal, in this paper, we show that its efficacy can be compromised by the optimization algorithm being used. In particular, we found through a theoretical analysis that, as opposed to Stochastic Gradient Descent (SGD), the update direction given by Adam optimization strongly depends on the sign of a combination of columns of the projection matrix used for watermarking. Consequently, as observed in the empirical results, this makes the coefficients move in unison giving rise to heavily spiked weight distributions that can be easily detected by adversaries. As a way to solve this problem, we propose a new method called Block-Orthonormal Projections (BOP) that allows one to combine watermarking with Adam optimization with a minor impact on the detectability of the watermark and an increased robustness.     

On the nature of a*kak and the emergence of the Born rule

This paper is intended to show that a review in the concept of the game theoretical utility, the revised utility to be applied to the definition of the utility of a wave function representing an object subsystem relative to its observer subsystem, both within an isolated system, leads to the emergence of Max Born's rule as a profit under a von Neumann good measure game.     

Testing the mechanism for the LSP stability at the LHC

The lightest supersymmetric particle (LSP) is a natural candidate for the cold dark matter of the universe. In this Letter we discuss how to test the mechanism responsible for the LSP stability at the LHC. We note that if R-parity is conserved dynamically one should expect a Higgs boson which decays mainly into two right-handed neutrinos (a “leptonic” Higgs) or into two sfermions. The first case could exhibit spectacular lepton number violating signals with four secondary vertices due to the long-lived nature of right-handed neutrinos. These signals, together with the standard channels for the discovery of SUSY, could help to establish the underlying theory at the TeV scale.     

用晶格玻尔兹曼方法研究血液在分岔管中的栓塞

血液栓塞形成机理一直是学术界研究的热点.本文将以圆形刚性颗粒在分岔管中的运动模拟血液在微血管中的运动,对血液在分岔管中的栓塞现象作了初步研究.重点研究了当血管发生分岔时,血管中血液流速的变化以及血栓形成的概率.得出结论,压积越大越容易发生栓塞,压差越大越不易发生栓塞.分岔管的入口和分岔处最容易发生栓塞.血液经分岔管后,大管中的压积比小管的高.     

折衍混合单透镜替代双胶合望远物镜的设计研究

提出了一种用以替代双胶合望远物镜的折衍混合单透镜的设计方法，由于一般望远物镜相对较大、视场较小，故其球差和色关功效大，校正要求高，而与视场有关的像差本身较小。通过分析初级像差，本文研究了折衍混合单透镜的折射器件（基底）选型、初始结构设计及消色差和球差的方法，仅采用一种玻璃材料Ｋ９，设计的折射混合透镜具有与原传统结构相当的色差和降低了约一半的单色像差，能成功地取代传统双胶合物镜；展示了折衍混合结构在     

Application of the structured illumination method to study the topography of the sole of the foot during a walk

The structured illumination technique consists of projecting a fringe system onto a 3D object from a well defined space point, which results in a pattern that depends on the characteristic of the projected fringes, the viewpoint and the illuminated object morphology. Therefore, the structured illumination method enables to determine the topography of 3D objects. To implement this technique we set up an optoelectronic array that allows studying the sole of the foot during a walk. The method consists of projecting a Ronchi grid and capturing the images generated on the foot by a CCD camera. These obtained images are graphically processed and fringes converted into vectors. A depending algorithm on the experimental setup allows obtaining, from those vectors data, cotes for a discrete profile plotting of the studied object. The method enables the quantitative determination of the sole topography during the walk. Qualitatively, it can be used for diagnosis and control of deformation and injuries caused by accidents or illnesses. It can be introduced in the primary attention health system to study a great number of patients, due to its simplicity and low cost installation, and for being a non-invasive technique.     

On the Possibility of the Implicit Renormalization of the Casimir Energy

We propose a procedure for renormalizing the Casimir energy that makes the steps that are used in the standard renormalization procedure, that is, regularization, subtraction, and deregularization, implicit. The proposed procedure is based on the calculation of a set of convergent sums, each of which is related to the initial divergent sum of the non-renormalized Casimir energy. Next, we construct a system of linear equations that relates this set of convergent sums to the renormalized Casimir energy. The unknown renormalized Casimir energy is obtained as a result of solving this system of equations. In this case, both the calculations of the convergent sums and the subsequent solution of the system of linear equations are performed with a certain (generally speaking, arbitrary) ordered accuracy; thus, the result is also approximate. The proposed procedure is, first, more computationally effective than the standard one, and, second, applicable not only to the problems where a transcendental equation for the spectrum can be written, but also to the problems where the spectrum is known only numerically.     

On the solutions of the hypernetted chain equation inside the gas-liquid coexistence region

We present a detailed study of the solutions of the hypernetted chain integral equation inside the gas-liquid coexistence region for simple Lennard-Jones fluids. The study is performed by means of a hybrid Newton-Raphson algorithm extended to cope with complex solutions. In this way, we have unequivocally confirmed that the origin of the well-known HNC singular behavior inside the coexistence curve is linked to the onset of complex solutions. As density is increased starting from the vapor phase along isotherms inside the coexistence region, another singularity is encountered (very likely linked with the existence of a complex multiple solution point), and correlations start to diverge. Therefore, with the numerical approach here presented it is not feasible to join the liquid and vapor phases through an analytically continuous path of real and complex solutions. Finally, a study of the transition from the mean spherical approximation behavior (characterized by the presence of a spinodal divergence) to the peculiar hypernetted chain sort of singularity is also presented.