Cs 728 nm Laser Spectroscopy and Faraday Atomic Filter

The laser spectroscopy of alkali-metal vapor is widely used in a number of applications, such as the Faraday anomalous dispersion optical fil- ter （FADOF）, the active optical clock, and wavelength references.Is＇ The Cs electrodeless dis- charge vapor lamp has rich spectra, including 455 nm, 459 nm, 728 nm, 852 nm, 1359 nm, and 1470 nm. The 852 nm laser pumping atoms from 6S1/2 to 6P3/2 have been used in FADOF.The 1359nm wave- length transited from 7S1/2 to 6P1/2 of Cs atoms can be used in the field of active optical clocks. The concept of active optical clocks has been proposed since 2005. Due to its good performance in sta- bility, the active optical clock has been extensively in- vestigated theoretically and experimentally in recent years, such as the two-level active optical clock, and three-level active optical clock. When considering the performance of the active optical clock, we hope to reduce the second-order Doppler shift in thermal atomic beam and the light shift induced by the pump- ing laser. To solve this issue, our group has recently proposed a four-level active optical clock, such as K 1252.2nm, Cs 1469nm, Rb 1366.9nm and Rb 728 nm. Moreover, the Rb 728 nm four-level quantum system has potentially a better performance than three long wavelength ones of Rb.     

SiC基中子探测器对热中子的响应

以SiC二极管和中子转换材料6LiF为基础,研制了SiC基中子探测器,并用241Am源与临界装置分别研究了SiC基中子探测器的粒子响应、热中子响应。结果表明:SiC基中子探测器能够满足241Am源粒子的计数测量,但由于SiC二极管灵敏区薄,故不能用于5.48 MeV的粒子能谱测量;SiC基中子探测器对热中子响应良好,不同功率下,脉冲幅度谱中可清晰看到由6Li(n,)3H的反应产物粒子、3H粒子形成的双峰;脉冲幅度甄别法可将射线及电子学噪声甄别掉;在直接测量与符合测量中,SiC基中子探测器的计数率均与临界装置功率成线性关系,且直接测量的线性度比符合测量的线性度好,最好可达0.999 97。研究表明:降低肖特基接触金属的厚度、增加其外延层厚度、提高其外延层品质,可将SiC二极管用于带电粒子能谱测量。     

广义幂级数环上Morita Context环的稳定条件

In this paper, we show that if rings A and B are （s, 2）-rings, then so is the ring of a Morita Context（[[A^S,≤]],[[B^S,≤]],[[M^S,≤]],[[N^S,≤]],ψ^S,Ф^S）of generalized power series. Also we get analogous results for unit 1-stable ranges, GM-rings and rings which have stable range one. These give new classes of rings satisfying such stable range conditions.     

Pt/Cu（001）-p（2×2）-O表面吸附结构的总能计算

采用密度泛函理论（DFT）研究了氧吸附后Pt/Cu（001）表面合金的原子结构和表面性质.计算结果表明,在Pt/Cu（001）-p（2×2）-O表面最稳定结构中,衬底表面原子层不发生再构,氧原子吸附于4重对称的Pt原子谷位,每个氧原子吸附能约为2.303 eV.吸附结构的Cu—O和Pt—O键键长分别为0.202和0.298 nm,氧原子的吸附高度ZCu—O约为0.092 nm.吸附前后Pt/Cu（001）-1ML（monolayer）表面合金的表面功函数分别为4.678和5.355 eV.吸附表面氧原子和衬底的结合主要来自氧原子2p轨道和衬底金属原子d轨道的杂化作用,氧原子吸附形成的表面电子态主要位于费米能级以下约-2.7 eV处.     

5-氟尿嘧啶的三元环类化合物的缀合物的合成及其抗肿瘤活性

基于具有三元环状结构的化合物的广泛生理活性和氟尿嘧啶的抗癌作用机制,本文设计、合成并表征了一系列新型5-氟尿嘧啶（5-FU）的三元碳环缀合物及三元氧杂环缀合物。并对5-FU 的N-1和N-3位的选择性烷基化方法进行了系统研究,发现苄氧甲酰氧甲基保护基具有稳定性高、有效保护性好、制备方便、易于脱除等特点,适宜于在本类反应中应用。测试了所合成的新型5-FU三元环缀合物的体外抗肿瘤活性,化合物7、8、12、13显示了对人食管癌细胞Ec9706不同程度的抑制活性。     

一个铜(Ⅱ)镍(Ⅱ)超分子化合物的合成、晶体结构与磁性

one new complex, [Cu(aeop)Ni(dpt)(H₂O)]·5H₂O, [H₄aeop=N′-(2-Aminoterephthalic acid)-N″-(1,3-Pro-panediamine) Oxamide], has been prepared by the diffusion method, where (aeop)^4- as bridging ligand, dpt as end ligand and characterized by elemental analysis, IR and X-ray crystal structure determination. It crystallizes in the Triclinic system, P1 space group with a=0.885 92(4)nm, b=1.232 53(6)nm, c=1.301 24(6)nm, α=85.593 0(10)°, β=78.753 0(10)°, γ=89.382 0(10)°, V=1.389 43(11) nm³, Z=2. The crystal structure analysis shows that intermolecular O-H…O and N-H…O hydrogen bonds result in a 3D supermolecular construction. The complex was characterized by magnetic susceptibility and presents a antiferromagnetic interaction (J=-46.4 cm^-1, g=2.24). CCDC: 727559.     

多重的非对称核Hardy-Hilbert积分不等式

该文对Hardy-Hilbert积分不等式进行推广, 建立具有最佳常数因子的非对称核Hardy-Hilbert型积分不等式和加权的Hardy-Hilbert型积分不等式,并考虑它们的一些特殊情况.     

高岭土原位晶化产品及全合成Y型沸石的稀土离子的交换平衡

本文测定了钠式高岭土原位晶化产品及全合成Ｙ型沸石与稀土离子铽Ｔｂ（Ⅲ）的离子交换等温线和平衡数据，采用了三种不同的热力学方法处理平衡数据，求得该离子交换反应Ｎｄ→Ｔｂ的选择系数、修正选择系数、热力学平衡常数以及标准自由能、热焓、熵的改变量。对这种离子交换剂的结果及三种热力学处理方法进行了对比及讨论。     

铯蒸汽中受激电子喇曼散射

本文报导了利用微微秒脉冲系列在铯原子蒸汽中产生受激电子喇曼散射,得到强微微秒红外脉冲的实验结果.波长为527nm的绿光经喇曼频移产生2.28μm的红外输出,最大能量达1mJ,量子转换效率为16%.实验测量了红外辐射强度及受激电子喇曼散射的阈值对蒸汽压、泵浦光强度的依赖关系,并进行了分析和讨论.