锈苞蒿挥发油的化学成分分析及其抗菌活性研究

采用滤纸片琼脂平板扩散法和微量肉汤稀释法检测了锈苞蒿挥发油对2种真菌和10种细菌(包括5种临床致病菌)的体外抑菌杀菌活性,结果显示,挥发油对大部分微生物均具有很好的抗菌作用,尤其对酵母菌、革兰氏阳性菌的抗菌活性更强,其最低抑菌浓度(minimal inhibitory concentration,MIC)为0.02～0.31 g/L,最低杀菌浓度(minimum bactericidal concentration,MBc)为0.04～1.25 g/LI其次利用气相色谱-质谱法(GC-MS)技术分析了锈苞蒿挥发油的化学组成,确定了28种成分的化学结构与相对含量,约占挥发油总组分的81.41%,主要由单萜和倍半萜组成,其中Vulgarnoe B(26.58%)、1,8-桉叶素(19.89%)和樟脑(7.91%)是主要成分.     

掺锰磷化铟中1.18eV辐射的施主受主对辐射性质的研究

通过对掺锰磷化铟的1.18eV辐射的频率响应谱(FRS)及辐射峰随激发强度的位移的研究得到了明确的证据,确认这个光致发光辐射的施主受主对(DAP)复合的性质。一个和Mn2+相关的复合跃迁过程被提出用以解释有关的实验结果。     

On the structure of split Leibniz triple systems

We study the structure of arbitrary split Leibniz triple systems with a coherent 0-root space. By developing techniques of connections of roots for this kind of triple systems, under certain conditions, in the case of T being of maximal length, the simplicity of the Leibniz triple systems is characterized.     

Load supporting prefabricated wall reinforced by a frame

This load supporting prefabricated wall consists of a thin plate reinforced along its boundaries by a frame. With the loads acting on the frame, the plate has its boundary conditions defined neither by forces nor by displacements. On the basis of satisfying the biharmonic equation of the stress function for the plate, we make the total strain energy to be minimum to ensure the compatibility of displacements for the two elastic bodies. Thus we get a set of infinite simultaneous equations. The results obtained indicate the method of solution is effective.     

PERTURBATION FINITE ELEMENT METHOD FOR SOLVING GEOMETRICALLY NONLINEAR PROBLEMS OF AXISYMMETRICAL SHELL

In analysing the geometrically nonlinear problem of an axisymmetrical thin-walled shell, the paper combines the perturbation method with the finite element method by introducing the former into the variational equation to obtain a series of linear equations of different orders and then solving the equations with the latter. It is well-known that the finite element method can be used to deal with difficult problems as in the case of structures with complicated shapes or boundary conditions, and the perturbation method can change the nonlinear problems into linear ones. Evidently the combination of the two methods will give an efficient solution to many difficult nonlinear problems and clear away some obstacles resulted from using any of the two methods solely. The paper derives all the formulas concerning an axisym-metric shell of large deformation by means of the perturbation finite element method and gives two numerical examples,the results of which show good convergence characteristics.     

Noble gas halides: The B → X and D → X systems of 136Xe35Cl

The B → X (2870–3100 Å) and D → X (2250–2370 Å) band systems of ¹³⁶Xe³⁵Cl are photographed and vibrationally analyzed. A simultaneous least-squares fit of 41 band-heads in the B-X system and 35 in D-X yields, in part, the following constants (in cm^?1): T_eB = 32 405.8, T_eD = 42 347.9, ω_eB = 194.75, ω_eD = 204.34, ω_eX = 26.22. The ground state dissociation energy ($\text{D}$″_e) is estimated to be 281 ± 10 cm^?1. Potential curves are derived for all three states through Franck-Condon calculations. From these curves the D-state internuclear distance is 0.09 ± .02 Å smaller than the B-state distance.     

一种非接触式稀土荧光自参比温度传感器

发展了一种非接触式稀土荧光自参比温度传感器,即将有机稀土配合物K[Yb(Az)₄]包埋在苯乙烯-甲基丙烯酸甲酯共聚物中,并附着在洁净的石英片上制备得到了温度传感薄膜Yb@PSMM。通过研究不同温度下Yb3+的荧光发射光谱,利用其在近红外波段荧光性质随温度变化的规律,开发了一种比率型稀土荧光温度传感方法,其原理是通过不同温度下Yb3+的荧光发射光谱的形状随温度的变化,结合在不同温度下Yb3+的核外电子在外层Stark劈裂亚能级上的分布符合Boltzmann分布律的特点,利用其近红外荧光发射光谱中900 nm~990 nm波长范围内与990~1 150 nm波长范围内的积分峰面积比的自然对数与温度的倒数呈现的线性关系作为温度测量的标准曲线,实现了-195~105 ℃范围内的温度精确测量。经考察,该发光温度传感器在0 ℃附近的温度测量分辨率达到了0.1 ℃。与已报道的发光温度传感器相比,提出的新型温度传感器具有如下几个优势：其一,所选用的发光材料的Stokes位移大于500 nm,有效地避免了环境背景干扰;其二,由于采用荧光积分峰面积而非荧光强度作为考察对象,大大减小了测量中由于仪器或测量次数较少引入的随机误差;其三,采用同一发光材料的荧光发射光谱中两个荧光峰面积的比值,相当于在体系中引入了自参比,有效避免了由于荧光材料的浓度、几何构型以及光源强度等外界因素变化对测量结果产生的影响;其四,利用稀土发光材料作为温度传感材料,可以利用其荧光寿命长、单色性好、强度高的特点;其五,温度传感膜本身不溶于水,也不在水中扩散,便于直接测量原位温度变化;其六,Yb3+的发光位于900~1 150 nm的近红外波长范围,而这个波段的荧光具有较好的穿透性使得该温度传感器有望在复杂体系的温度传感、成像等领域发挥重要作用。在实际测量的装置中,通过调整光路使得辐照在样品上的入射光斑大小仅约为1 mm2,并将Yb@PSMM固体膜样品的放置方向与入射激发光的夹角设置为225°,从而规避了入射光源的反射光对检测器的影响,而具有较好穿透能力的近红外荧光几乎不受影响,从而进一步确保了该温度传感器的测量结果。     

身临其境 无拘无束——自由立体显示技术

 从2009 年底立体电影《阿凡达》在全球同步上映以来, 人们对立体影像的热情被迅速点燃, 《诸神之战》、《爱丽丝梦游仙境》等各类立体影视作品相继推出;美国男子职业篮球联赛（NBA）、南非世界杯以及多项体育赛事也纷纷采用立体转播以吸引眼球;中外各大显示器制造商如夏普、三星、索尼、维度（DTI）、海信、TCL 等更是大力推出各种可以播放立体影像的显示终端, 甚至各大手机厂商也纷纷开始研制立体手机。伴随着与立体相关的显示终端制造、片源设计、信号传输等一系列产业的迅速兴起, 人们不禁惊呼：属于立体显示的时代终于到来了。     

30CrMnSiNi2A晶格参量的测量及回复规律研究

针对X射线衍射领域中晶面衍射峰重叠问题,提出一种新的重叠峰分离方法.采用RU-200V转靶衍射仪对30CrMnSiNi2A晶格参量及其回复规律进行研究,得出不同回火温度下晶格参量与碳含量的变化关系.研究结果发现:由于碳的过饱和度不同以及合金元素的影响,30CrMnSiNi2A与高碳马氏体晶格参量的变化规律虽基本符合,但其变化速率存在差异.在不同回火温度下晶格参量a基本与碳含量无关,随着回火温度升高,a值略有下降.晶格参量c则随碳含量的变化幅度较大,从淬火态到180℃回火态出现一个陡降过程,随着回火温度升高,其变化幅度又趋于平缓.     

谷值V~2控制Boost变换器的精确建模与动力学分析

建立了谷值V2控制Boost变换器的离散迭代映射模型,在此基础上得到了输入电压、输出电容及其等效串联电阻(equivalent series resistance,ESR)变化时的分岔图,推导了不动点处的雅可比矩阵,利用特征值和最大Lyapunov指数对系统进行了稳定性分析,并验证了分岔图的正确性.重点研究了输入电压和输出电容及其ESR对谷值V2控制Boost变换器的动力学特性的影响.研究结果表明,输入电压增大时,变换器从周期1态经历1次倍周期分岔和边界碰撞分岔进入混沌状态;输出电容及其ESR具有相同的分岔路由,随着输出电容及其ESR的逐渐减小,变换器具有从周期1态经历周期2态、周期4态、周期8态、逐渐演变到混沌态的动力学行为.最后,用仿真和实验结果验证了本文理论分析的正确性.