爱立信系统用户分级功能创新优化方案

目前VIP用户和普通用户在网络上得到的待遇一样,享受同样的通话质量和接入性能,VIP没能体现在网络资源上,也没有体现在网络感受上.因此,有必要使用网络用户分级服务功能,让高价值用户优先占用较多资源.本文就实现该目标提出了基于爱立信EMLPP分级服务的自主创新优化方案.     

气体湍流对泡生法生长蓝宝石单晶温场的影响

本文采用专业晶体生长模拟软件CrysVUn对泡生法生长大尺寸蓝宝石单晶进行了计算机模拟.分析了气体压力对泡生法生长蓝宝石单晶的温场、气体速度场的影响.结果发现在气压P≥105Pa时,特别是在引晶初期,容易出现籽晶根部熔化,这在实验中得到了很好的验证,并提出了三种解决方案.     

Cu-Fe-PILC催化C3H6选择性还原NO的性能

采用羟基铁离子柱撑Na-Mont制备出1.0Fe-PILC,通过超声浸渍法合成不同铜负载量的nCu-Fe-PILC,并测试了其在富氧条件下催化C_3H_6选择性催化还原NO的性能。通过N_2吸附脱附、XRD、UV-Vis、H_2-TPR、Py-FTIR等技术手段表征催化剂的微观结构和物化性质,进一步解释其催化反应机理。结果表明,Cu的引入提高了1.0Fe-PILC的中低温活性和抗水硫能力。其中9Cu-Fe-PILC在300℃时NO转化率可达69.8%以上,400℃后NO转化率保持在99%以上且水硫影响较小。XRD、N_2吸附脱附结果表明,催化剂的SCR活性与所负载的活性组分和催化剂的吸附能力有关。UV-Vis结果表明,9Cu-Fe-PILC具有较强的中低温活性,与其含有较多的游离态Cu~(2+)有关。H_2-TPR结果表明,与1.0Fe-PILC相比,经Cu修饰的nCu-Fe-PILC获得了中低温还原能力。Py-FTIR结果表明,nCu-Fe-PILC表面同时含有Lewis酸和Br?nsted酸,Lewis酸是影响催化剂SCR活性的主要因素。     

新型7-乙基-10-羟基喜树碱衍生物的合成及其体外抗肿瘤活性

以乙二醇为起始原料,依次经亲核取代和点击反应合成了一种7-乙基-10-羟基喜树碱(SN38)的新型葡萄糖残基衍生物(FSY02),其结构经¹H NMR, ¹³C NMR和HR-MS(ESI)表征。采用四甲基偶氮唑盐比色法（MTT法）研究了FSY02对人非小细胞肺癌细胞(A549)、人肝癌细胞(HepG2)、人结直肠癌细胞(SW-480)、人宫颈癌细胞(Hela)和人乳腺癌细胞(MDA-MB-231)的生长抑制作用。并采用Hoechst 33258染色和Western blot技术对给药后的结肠癌细胞凋亡情况和相关凋亡信号通路Caspase 3、 Bax和Bcl-2蛋白的表达情况进行了检测。结果表明：FSY02具有广谱抗癌活性,IC₅₀=0.118~4.295 μmol·L^-1,优于对照组伊立替康(IC⁵⁰=14.330~65.353 μmol·L^-1)。 Hoechst 33258染色及Western blot检测结果显示：FSY02通过上调Caspase 3和Bax的表达,下调凋亡抑制蛋白Bcl-2的表达诱导细胞凋亡。     

Dielectronic Recombination of Sn^10＋ Ions and Related Satellite Spectra

Based on the multi-configuration Dirac-Fock method, theoretical calculations are carried out for the dielectronic recombination （DR） rate coefficients and the collision excitation rate coefficients of Sn^10＋ ions. It is found that the total DR rate coefficient has its maximum value between 10eV and 100eV and is greater than either the radiative recombination or three-body recombination rate coefficients （the number of free electrons per unit is 10^21 cm^3） for the ease of Te 〉 1 eV. Therefore, DR can strongly influence the ionization balance of laser produced multi-charged tin ions. The related dieleetronie satellite cannot be ignored at low temperature Te 〈 5 eV.     

Density and Symmetric Potential Dependences of Isoscaling Behaviour in the Lattice Gas Model

Isoscaling behaviour of the statistical emission fragments from the equilibrated sources with Z=30 and N=30, 33, 36 and 39 is investigated in the framework of the isospin-dependent lattice gas model. The dependences of isoscaling parameters α on source isospin asymmetry, temperature andfreeze-out density are studied, and the `symmetry energy' is deduced from isoscaling parameters. The results show that symmetry energy C_sym is insensitive to the change of temperature but follows the power-law dependence on the freeze-out density ρ. The effect of strength of asymmetry of nucleon--nucleon interaction potential on the density dependence of the symmetry energy is discussed.     

Permutation Matrix Method for Dense Coding Using GHZ States

We present a new method called the permutation matrix method to perform dense coding using Greenberger--Horne--Zeilinger (GHZ) states. We show that this method makes the study of dense coding systematically and regularly. It also has high potential to be realized physically.     

Comparison of Laser Performances of 5at.% Yb:Gd2xY2(1-x)SiO5 Crystals between Different Cutting Directions

We investigate the laser actions of 5at.% Yb:Gd_2xY_2(1-x)SiO₅ (Yb:GYSO; x=0.1) crystals with different cutting directions, parallel and vertical to the growth axis. Our results show that the cutting direction of the sample plays an astonished role in the laser operation. The sample cut vertically to the growth axis possesses the favourable lasing characteristics. Its output power reaches 3.13W at 1060nm with a slope efficiency of 44.68% when the absorbed pump power is 8.9,W. In contrast, the sample cut parallel reaches only 1.65W at 1044nm with a slope efficiency of 33.76% with absorbed pump power of 7.99W. The absorption and emission spectra of the two samples are examined and the merit factor M is calculated. Our analysis is in agreement well with the experimental results. The wavelength tuning range of the superior sample covers from 1013.68nm to 1084.82nm.     

Large Magnetoresistance Based on Double Spin Filter Tunnel Barriers

We propose and theoretically analyse a double magnetic tunnel device that takes advantages of the spin filter effect. Two magnetic tunnel barriers are formed by different spin filters which have different barrier heights. The magnetoresistance of the device is low （high） when the magnetic moments of the two spin filters are parallel （antiparallel）. We present a theoretical calculation of the magnetoresistance based on electric tunnel effect. In addition, the effect of the difference barrier heights and exchange splitting energies between the two spin filters are also analysed in detail. The numerical results show that the spin filter in this configuration gives a magnetoresistance larger than that with standard magnetic tunnel junctions.     

掺杂对二硼化镁超导体上临界磁场的影响

采用二带Ginzburg-Landau(GL)理论模型,考虑到能带有效质量的各向异性,讨论了MgB2超导体的上临界磁场对角度、温度和相干长度的依赖关系.结果表明,替代杂质越多,上临界磁场越强,这与实验结果符合.