抗菌素阿莫西林荧光分析法的研究

本文提出了阿莫西林［（2S,5R,6R）-3,3-二甲基-6-［(R)-(-)-2-氨基-2-(4-羟基苯基)乙酰氨基］-7-氧化-4-硫杂-1-氮杂双环［3,2,0］庚烷-2-甲酸三水化合物］荧光分析的方法。并对影响阿莫西林荧光性质(光谱和光谱强度)的各种因素,包括pH值、表面活性剂的增效作用、无机离子的配合作用以及其他介质条件等进行了较为详细的研究。实验结果表明,阿莫西林具有良好的荧光性质,在微碱性条件下荧光发射最强,CTAB对其有增效作用,与无机离子(Mg     

Lifetimes of Excited Levels in ^131Ce

The fusion-evaporation reaction ^116Sn (^19F, p3n)^131 Ce at projectile energy of 95 MeV is used to populate high spin states in ^131Ce. The de-exciting γ-rays are detected in γ-γ coincidence measurement with Compton-suppressed BGO-HPGe detectors. Level lifetimes of ^131 Ce were determined by using the Doppler shift attenuation method.The experimental results indicate that collectivity of ^131 Ce is reduced relative to that of ^130Ce and it follows that deformation decreases with increase of the neutron number on the basis of systematic comparison of transition quadrupole moments for the light cerium isotopes.     

Dynamic Mechanism of Sustainable Molecular Orientation Generated From Cyclic Rotational States

Recently, two papers presented by Ortigoso et al. [Phys. Rev. Lett. 93 （2004） 073001 and Phys. Rev. A 72 （2005） 053401] develop a novel strategy in which the best sustainable molecular alignment/orientation has been achieved. We intend to analyse the dynamic mechanisms, including those Ortigoso et al. have not clarified.     

Compact Single-Stage Femtosecond Multipass Ti：Sapphire Amplifier at 1 kHz with High Beam Quality

A compact femtosecond Ti：sapphire amplifier system is reported using single-stage multipass configuration with high beam quality. A high dispersion glass stretcher and a pair of double prisms for compression are introduced based on broadband femtosecond seed pulses. The non-grating-based pulse stretcher and compressor are advantageous to increase high beam quality and to reduce the high-order dispersion. A Gaussian filter is used to reduce the gain narrowing effect in amplification. The compact femtosecond Ti：sapphire nine-pass amplifier delivers pulses with a duration of 26 fs and an energy of 800μJ at 7mJ pumping pulses energy at I kHz. The 1-kHz femtosecond amplifier with high beam quality and high stability is very suitable for ultrafast physics research applications, such as attosecond science, ultra-precision micromachining, and THz wave generation.     

锑化铟单晶的小平面生长及孪晶

采用切克劳斯基技术,观察了按不同晶向从熔态生长InSb单晶时固液界面的形貌。实验表明,结晶面上{111}小平面的发展和性质与单晶体的外形及孪晶的形成有着密切的关系,采用一个闪锌矿结构的{1ll}面八面协及双八面体模型能成功地解释各种实验现象。 关键词：     

Realization of Toffoli gate operation using four-level atoms in cavity QED system

This paper proposes a scheme for realization of a three-qubit Toffoli gate operation using three four-level atoms by a selective atom--field interaction in a cavity quantum electrodynamics system. In the proposed protocol, the quantum information is encoded on the stable ground states of atoms, and atomic spontaneous emission is negligible as the large atom--cavity detuning effectively suppresses the spontaneous decay of the atoms. The influence of the dissipation on fidelity and success probability of the three-qubit Toffoli gate is also discussed. The scheme can also be applied to realize an N-qubit Toffoli gate and the interaction time required does not rise with increasing the number of qubits.     

Ronchi光栅光密度的一种测试方法

本文提出利用衍射光栅的反射特性,在自光图像处理系统中对光栅进行实时无损伤检验.这种方法灵敏度高、简便易行,有较高的实用价值.理论与实验结果一致.     

球面高速精磨模的修正

<正> 球面高速精磨模加工面的径向跳动量除依靠机床的跳动控制在0.01mm外,还要依靠基体模的径向定位基面保证主轴螺纹与基体模之间的同轴性。当机床的主轴径向跳动量达不到0.01mm,或机械加工的基体模球面径向跳动达不到适合高速精磨的精度时,可修正基体模球面和高速精磨模加工面,达到所要求的精度。修正的方法是先将基体模装到高速精磨机床主轴上,用百分表测量出要修正最大值方向,在钢球模与基体模用金刚砂对磨时,在最大值方向用手加压(凸凹基体模置钢模之上),加压之后再对     

稀磁半导体Cd_（1－x）Fe_xTe的磁光光谱

在７０－３００Ｋ温度范围内测量了组分ｘ为０．０１和０．０４的Ｃｄ１－ｘＦｅｘＴｅ及ＣｄＴｅ的法拉第效应随入射光子能量的变化，首次获得了Ｃｄ１－ｘＦｅｘＴｅ在布里渊区Γ点和Ｌ点的有效ｇ因子及其与温度的关系。给出了Ｆｅ２＋离子与载流子间的ｓｐ－ｄ交换作用常数Ｎ０（β－α）＝（－１．５７±０．０３）ｅＶ。