Octupole Deformed Band and Quasi-γ Band in 146Ce Nucleus

High-spin structures in ¹⁴⁶Ce nucleus have been re-investigated by measuring the prompt γ rays from spontaneous fission of ²⁵²Cf. The previously reported level scheme of ¹⁴⁶Ce has been updated. The octupole deformed collective bands have been extended up to higher spin states. A possible quasi-γ band structure was examined and reconstructed according to our data analysis. In addition, the reflection asymmetric shell model was applied to describe the octupole deformed bands in ¹⁴⁶Ce, and the calculated results are in good agreement with the experimental data at lower spins.     

Collective Dand Structures in Doubly Odd 136La Nucleus

Using heavy-ion nuclear reaction and in-beam γ-ray spectroscopy technique,high spin states of ¹³⁶La have been studied. The nuclear reaction used is ¹³⁰Te(¹¹B,5n) with a beam energy 60MeV. The level scheme with three collective band structures has been updated with spin up to 20h. The collective backbending has been observed in $\uppi h_{11/2}\otimes \upnu h_{11/2}$ band. According to the TRS calculations,this backbending is due to the alignment of a pair of h_11/2 neutrons. The signature splitting and inversion for the $\uppi h_{11/2}\otimes \upnu h_{11/2}$ band were also discussed. Other two bands based on $12^-$ and $16^+$ levels were proposed as oblate deformation with $\gamma\approx -60^\circ$. They most probably originate from four- and six- quasiparticle configurations, that is,$\uppi h_{11/2}\otimes\upnu g_{7/2} h_{11/2}^2$ and $\uppi g_{7/2}\otimes\upnu g_{7/2}^2 d_{5/2}h_{11/2}^2$ respectively.     

线阵CCD的调制传递函数

线阵CD作为成像器件得到了日益广泛的应用,因而研究线阵CCD的调制传递函数MTF显得非常必要和重要。本文分析线阵CCD动态MTF及静态MTF,并对其影响因素进行讨论。     

Synthesis and Crystal Structure of a Novel Tetranuclear Complex [Pb4（HQ）6（NO3）2]

Reaction of 8-hydroxyquinoline （HQ） with Pb（NO3）2 in water resulted in the formation of a tetranuclear complex [Pb4（HQ）6（NO3）2] 1. It has been characterized by IR, elemental analyses and X-ray diffraction. Crystal data for this complex： triclinic system, space group P1, a = 9.7399（6）, b = 11.6535（8）, c = 12.6806（8） A, α = 62.8050（10）, β = 78.4910（10）, γ = 80.5490（10）°, C54H36N8O12Pb4, Mr= 1817.67, Z = 1, V = 1250.04（14）A^3, Dc = 2.415 g/cm^3,μ = 13.503 mm^-1, -12≤h≤8, -14≤k≤13, -15≤1≤15, F（000） = 840, Rint = 0.0217, R= 0.0348 and wR = 0.0927. X-ray crystal structure analysis revealed that in 1 each Pb（ II ） contains a stereo- chemically active lone pair of electrons. The Pb…C interaction, C-H……O weak interaction and π…π stacking interactions are observed in the complex. In the solid state, the complex possesses strong photoluminescent emission at 485 and 528 nm.     

HL-2A装置上边界间歇性事件与湍流粒子输运的统计学研究

通过对粒子概率分布函数的计算,发现在高等离子体密度下边界间歇性事件的爆发频率有所增加。通过条件平均的手段,正负间歇性事件得以区分,并发现了二者在空间上的不同特征。不同密度梯度下的湍流粒子输运计算表明,间歇性事件与湍流粒子输运之间存在密切联系,间歇性事件的存在能够大大增加湍流粒子输运的大小。在高等离子体密度时,间歇性事件的强度有所增加,而与之相应地,湍流粒子输运的大小也有所增强。     

热解温度对酸沉淀工业木质素快速热解液体产物的影响

利用快速热解和气质联用技术,研究了酸沉淀工业木质素在400℃～700℃下快速热解液体产物的主要组分及其含量的变化。酸沉淀工业木质素快速热解液体产物中主要包括,与木质素的三种苯丙烷结构单元结构相似的苯酚、愈疮木酚和2,6 二甲氧基苯酚等酚类化合物,以及它们的甲基、乙基或丙基的单取代或多取代衍生物。在400℃～600℃,热解液体产物的组分及其相对含量的变化不显著;而在600℃～700℃,芳环上含甲氧基的酚类物质的相对含量急剧减少甚至消失,而苯酚的相对含量却急剧增加,达到27.81％,比400℃的增加了近2.5倍,同时芳烃化合物的相对含量增加,并出现苯丙呋喃、茚和萘等芳环化合物。     

固相萃取-反相高效液相色谱法测定隐形眼镜护理液中聚胺丙基双胍

建立了固相萃取-反相高效液相色谱法测定隐形眼镜护理液中聚胺丙基双胍的方法.用Spe-ed WCX固相萃取柱(500 rag/3 mL)将样品浓缩富集后,以Shiseido C18色谱柱(150 min×4.6 mm,5 pm)为分离柱,以pH 4.0的乙腈-20 mm01.L-1乙酸铵(体积比16比84)为流动相,检测波长为235 nm,7 min内测定样品中聚胺丙基双胍.方法检出限(S/N=3)为0.046 mg·L-1,相对标准偏差为3.3%(n=7),线性范围为100～800 mg·L-1,加标回收率93.5%～110.9%.     

一场科学的辩论赛——谣言有罪盐无罪

Amid five tastes, only salt is indispensable. As a kind of essential nutrition, salt plays a vital role in our daily life. Although the salt is in small particle size, yet it received a lot of rumors. In recent years, rumors on salt have sprung like mushrooms including sea salt, iodized salt, low sodium salt, additive in salt and so on. To stop the rumors from spreading and to clarify that the salt is innocent, a debate competition was applied to tell the truth:rumors are guilty rather than salt!     

新系列超导相TlBaCan-1CunO2n+2.5(n=2,3)的晶体结构和超导电性

本文用粉末烧结法合成了Tl-Ba-Ca-Cu-O体系TlBa₂Ca_n-1Cu_nO_2n+2.5新系列超导相,用粉末衍射法测定了n=2和3的晶体结构,属简单四方单胞,空间群为D_4h¹-P4/mmm,点阵常数a相同,而c值不同,随n值而增大。a=3.847?,c分别为12.73?和15.89?,每单胞含一个化合式单位,阳离子沿四方晶系的(0,0,z)和(1/2,1/2,z)位置交替排列,排列的顺序相同,n=3比n=2依次多增加Ca和Cu及相应的氧离子。TlBa₂Ca_nCu_nO_2n+2.5,n=3时,零电阻超导转变温度T_c(0)=112K;n=2时,T_c(0)=101K,与Tl₂Ba₂Ca_n-1Cu_nO_2n+4型体心四方晶胞超导相不同,TlBa₂Ca_n-1Ca_nO_2n+2.5结构中缺氧类钙钛矿型结构单元[Ba₂Ca_n-1Cu_nO_2n+1]仅被TI-O单层所隔开,当n相同时,Tl-O双隔层的体心四方单胞比Tl-O单层的简单四方单胞的超导转变温度高10K左右,这说明Tl-Ba-Ca-Cu-O体系中超导相的转变温度不仅与类钙钛矿结构单元的[CuO₄]和[CuO₅]的数目有关,而且与Tl-O的隔层数目有关。 关键词：     

C60的激发态光谱S1→Sn,T1→Tn与反饱和吸收

用ＩＮＤＯ／ＣＴ方法研究了Ｃ６０分子的电子结构及基态和激发态光谱（Ｓ０→Ｓｎ，Ｓ１→Ｓｎ，Ｔ１→Ｔｎ），激发态分子动态学和反饱和吸收的微观机制，用动态模型解速率方程，实现反饱和吸收的必要条件是激发态对激光的吸收截面，在波长５３２ｎｍ的激光作用下，Ｃ６０满足该条件，故Ｃ６０呈现反饱合吸收特征，理论分析与实验结果一致。