Determination of Chemical Effect on the Kβ1/Kα, Kβ2/Kα, Kβ2/Kβ1 and Kβ/Kα X-Ray Intensity Ratios of 4d Transition Metals

It is clear that detailed studies performed under identical experimental conditions are desirable to determine the effect of the chemical environment on the value of intensity ratios. To better understand this effect, we conducted measurements on Kβ₁/Kα, Kβ₂/Kα, Kβ₂/Kβ₁ and Kβ/Kα x-ray intensity ratios. The Kα and Kβ_1,2 emission spectra for compounds of 4d transition metals Y, Zr, Nb, and Mo were measured using a Si(Li) solid-state detector. The samples were excited by 22.69 keV x-rays emitted from a ¹⁰⁹Cd radioisotopes source. The experimental results for pure elements are compared with the other experimental and theoretical values.     

ВЛИЯНИЕ СПЕКТРАЛЬНО ГО ПРОФИЛЯ ДУБЛЕТАKα 1 α 2 И ДИФРАКЦИОННОГО РАС ШИРЕНИЯ НА ИНТЕГРАЛЬ НУЮ ИНТЕНСИВНОСТЬ ДИФРА КЦИЙ ПРИ ВЫСОКИХ УГЛА Х БРЭГГА

, K _{1 2} LP . 75°85° K , . , <80°. ( , ) <83°. , 90° , , , . >83° , , .

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The influence of the spectral profile of theK₁₂ doublet and diffraction broadening on the integrated intensities of high angle diffractions

Relations are derived giving the influence of the spectral profile of theK _{1 2} doublet and the influence of diffraction broadening on the productLP of the Lorentz and polarization factor. The relations are used to calculate the numerical values of the corresponding corrections for the theoretical values of the integrated intensities of diffractions in the angular region 75°85° and for the most frequently usedK radiation of copper, cobalt and iron.It follows from the calculated values of the corrections that, due to the accuracy at present attainable in experimental measurements, the influence of the spectral profile in diffractions with an angle<80° can be neglected when calculating the theoretical values of the integrated intensities. The influence of diffraction broadening need not be taken into account in diffractions with an angle<83° even when the broadening is large (e. g. five-fold). As the angle approaches 90°, of eourse, the corrections for both above influences suddenly increase, particularly those for diffraction broadening, and their limitation becomes difficult and is not single-valued. For this reason the use of diffractions with angles>83° does not appear very suitable for solving problems based on exact measurement of the integrated intensities and their comparison with the corresponding theoretical values.

     

鬼针草中维生素K1的研究

样品经丙酮、石油醚提取,用失活磷酸盐处理过的氧化铝进行柱色谱净化处理,用极性不同的洗脱液将样品中VK1分离出来,用C18色谱柱对维生素K1进行定性分析,流动相为甲醇:正己烷(75:25),紫外检测波长为248nm.在流速为1.5mL/min的条件下,用HPLC分析不同生长阶段的鬼针草中维生素K1(VK1)的存在及含量的变化.维生素K1的保留时间为2.18士0.01min,RSD%为2.52%,回收率范围为94.97%-100.49%.鬼针草含有维生素K1,含量随生长阶段的不同有变化.     

获得1K级低温及其热分析

本文报道由液氦(~4Hc)获得1K级低温的减压降温装置技术及其热分析.实验结果已达到1.17 K.测量了实验杜瓦的轴向温度分布.已用于超流氦温度下复合材料导热系数的实验研究和氦λ点温度以下温度计的标定.     

ПРИБОР ДЛЯ РАЗЛОЖЕНИ Я КОМПОНЕНТ Kα1, α2 ДУБЛЕТА НА РЕНТГ ЕНОВСКИХ ДИФФРАКЦИОННЫХ СНИМ КАХ

n ₁, ₂ , -.     

K—K共振态

最近实验指出,在π^-+p→K+K+n以及K^-+p→K+K+A反应中,存在K-K的共振态,共振能量为1.02BeV。不少人对K-K共振态进行了分析,但并没得出一致的结论。本文从场论观点出发,在链式近似下,研究了有关K-K共振的一些问题,计算结果表明,在1.02BeV附近可能存在两个共振态,而1.02BeV的K-K共振对应T=0,J^PG++态较为合理。     

转变宽度为1K的YBaCuO超导体

用Y_2O_3,BaO_2和Cu的粉末为原料备制出性能很好的Y_xBa_(1-x)CuO_(3-y)超导体。用电阻法和交流磁化率法测量了样品的超导性质。x=1/3的样品的超导起始转变温度,零电阻温度和转变宽度分别为97K,93K和1K。而x=0.6的样品分别为95K,90.5K和1K。作者还用持续电流法测量了样品的临界电流与温度的关系。     

Symmetry-restoring interactions for Kπ = 1+ isovector vibrations

The low-lying isovector 1⁺ states are studied by a symmetry-restoring RPA approach in some rare-earth nuclei. A new velocity-dependent residual interaction is proposed in order to restore the rotational invariance of the hamiltonian in the quasiparticle random-phase approximation with an axially-symmetric Woods-Saxon potential. A new quadrupole interaction is introduced with a self-consistently determined coupling strength. Calculations for six rare-earth nuclei (¹⁵⁴Sm, ^156,158Gd,¹⁶⁴Dy,¹⁶⁸Er,¹⁷⁴Yb) show a good agreement with the experimental energies and B(M1) values. The M1 transitions, corresponding to the experimental strong magnetic dipole states, have in all apart from one case a predominant orbital contribution. The largest orbital contribution (90%) is found in ¹⁵⁴Sm. About half of the low-energy (E < 5MeV, B(M1)↑>0.1μ_N²) states in each nucleus have an orbital character with a (10–40)% spin admixture. The M1 strength is concentrated in the region 2–9 MeV with a maximum around 5 MeV and corresponds to ΔN_osc = 0 transitions.     

K α L 1 satellite multiplet structure of photon-excited chlorine atoms

Summary An attempt is made to study theK _α L ¹ satellite multiplet structure of chlorine atoms in different compounds by photon excitation. A comparison of the averageK _α L ¹ group energy shift from the diagram line with those based on Dirac-Fock evaluations with different number ofM-shell electrons shows a reasonable agreement. The intensity ratios are found to be higher than those studied in Mg compounds in general.     

A New 1×K Tunable Multi-wavelength Router and its Features

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｗａｖｅｌｅｎｇｔｈｒｏｕｔｅｒｓ (ＷＲｓ)ａｒｅｋｅｙｄｅｖｉｃｅｓｉｎｗａｖｅｌｅｎｇｔｈ ｒｏｕｔｉｎｇａｌｌ ｏｐｔｉｃａｌｎｅｔｗｏｒｋｓ.Ｒｅｃｅｎｔｌｙ ,ｒｅｓｅａｒｃｈｆｏｒｔｈｅＷＲｓｈａｓｂｅｅｎｏｎｅｏｆｈｏｔｓｐｏｔｓｉｎｗａｖｅｌｅｎｇｔｈｄｉｖｉｓｉｏｎｍｕｌｔｉｐｌｅｘｉｎｇ (ＷＤＭ )ｎｅｔｗｏｒｋｔｅｃｈｎｏｌｏｇｉｅｓ[1,2 ] .Ｂｙｄｉｆｆｅｒｅｎｔｒｏｕｔｉｎｇｐａｔｔｅｒｎｓ,ｔｈｅＷＲｓｃａｎｂｅｄｉｖｉｄｅｄｉｎｔｏｔｗｏｋｉｎｄ…     

Structure of iron to 1 Gbar and 40, 000 K

First-principles calculations show that compression-induced electronic transitions produce a rich phase diagram featuring reentrant stability of the fcc phase with an extremum on the fcc to hcp boundary at 23?Mbar and 19?000?K, conditions similar to those expected at the center of super-Earth exoplanets. Transformations of hcp to fcc at 57?Mbar due to 4s to 3d electron transfer and from fcc to a body-centered structure at 320?Mbar due to hybridization of the 3d with the core 3p band are experimentally observable along a quasi-isentrope generated by laser-induced ramp compression.     

K=1形变HF态的近似角动量投影

应用我们的单参量近似角动量投影方法, 研究了K=1轴对称HF内秉态的角动量投影能谱, 比较了严格的和近似的投影矩阵元, 给出了角动量等于1到11的投影积分曲线, 计算了⁴⁴Ti和⁵⁰Ti的能谱, 结果是满意的.     

Homogeneous Kähler manifolds and flat-potential N=1 supergravities

Given a homogeneous Kähler manifold, with trivial Kähler class, there is at least one (usually infinitely many) homogeneous Kähler metric and superpotential such that the scalar potential of the corresponding N=1 SUGRA vanishes identically. We give the explicit form of the function G for the general case.     

193T1超形变带K=1/2的可能性

分析了脱耦合项对于原子核转动惯量的重要影响.总结了奇质量核K=1/2带转动惯量变化规律的新特点.在此基础上讨论了¹⁹³T1中3条新的超形变带的内部结构.目前尚无足够证据能够确认它们都是K=1/2带.