葛花中异黄酮类化学成分的RRLC-Q-TOF MS/MS研究

采用快速分离液相色谱-四极杆-飞行时间质谱联用(RRLC-Q-TOF MS/MS)技术对葛花中的异黄酮类成分进行了研究, 得到了相应化合物的保留时间、 分子量及结构信息. 研究结果表明, 葛花水提取液的主要成分为异黄酮类及其苷类化合物, 并含有皂苷类和酚类化合物. 在葛花中首次发现同属植物狐尾葛特有化合物Alopecuroides A和葛根中的化合物3'-甲氧基大豆苷元-7-O-甲醚. 讨论了异黄酮类化合物的质谱碎裂途径及规律.     

商代墓向的统计分析

本文采用系统聚类分析等方法 ,对河南、河北两省部分地域内发掘出的商代墓葬的方向进行统计分析发现 ,商代墓葬具有非常明显的埋葬规律性。并判断出这部分地域内商代墓葬的墓主人至少可归属于 1 3个主要族属。此结论恰好与《左传》定公四年记载的分鲁公和分康叔殷族属数之和相一致。     

钽和LY12铝的高压声速测量

应用两种不同的实验装置钽飞片/LY12铝缓冲层/LiF窗口和钽飞片/LiF窗口,采用逆向碰撞法测量了钽在110~131 GPa冲击压力下的纵波声速。实测的钽的声速结果与文献\[5\]报道的数据有较好的一致性。研究结果表明,作为缓冲层的LY12铝与LiF窗口的阻抗比较接近,使用缓冲层对钽的声速测量结果没有明显影响。实验测量同时获得了LY12铝在110 GPa和131 GPa冲击压力下的纵波声速。结合文献\[4\]的数据表明LY12铝在125～150 GPa冲击压力范围内,纵波声速随冲击压力的增加逐渐降低至体波声速。     

求高阶非齐次微分方程(组)特解的矩阵解法

给出了求一类高阶非齐次线性微分方程(组)特解的矩阵解法.即由对应齐次微分方程(组)的n个特解以及非齐次微分方程(组)的自由项构成某线性方程组的增广矩阵,并对该增广矩阵进行初等行变换,即可求得非齐次微分方程(组)特解的一种简便方法.     

用于太阳能推进的可折叠展开式伞状龙骨聚光器

为有效提高空间太阳能聚光器的聚光效率,提出了一种用于太阳能热推进器的具有伞状龙骨结构的可折叠展开式抛物面太阳能聚光器设计方案,该方案可以克服充气展开式抛物面聚光器和刚性固定抛物面聚光器具有的技术难题。设计了一个聚光功率100 kW,开口圆半径4.9 m的可折叠展开式伞状龙骨结构正焦抛物面聚光器,利用Fluent软件,对太阳能热推进器进行了模拟和性能预示,以氢气为工质气体,得到系统的推力和比冲可以分别到达10.23 N和701.4 s。结果表明:这种推进器具有比冲高、推力适中的特点,可以用于微小卫星、纳卫星的轨道转换及姿态控制。     

发动机气门尺寸计算机视觉检测软件系统的设计

介绍了一种基于Visual C#的发动机气门尺寸计算机视觉检测软件系统。根据发动机气门尺寸计算机视觉检测的功能需求,采用Visual C#开发平台,设计开发了检测软件整体结构。通过调用运动控制卡中的运动函数库,在闭环控制状态下实现对伺服电机的控制。设计了控制线阵CCD进行图像采集程序和检测结果输出控制程序。实现了对各软件功能模块的调用与管理,并已实际应用于汽车发动机气门尺寸自动光电检测系统中,取得了良好的应用效果。     

A Modified Free Volume Model for Characterizing of Rate Effect in Bulk Metallic Glasses

We investigate the plastic deformation and constitutive behaviour of bulk metallic glasses （BMGs）. A dimensionless Deborah number DeiD = tr/ti is proposed to characterize the rate effect in BMGs, where tr is the structural relaxing characteristic time of BMGs under shear load, ti is the macroscopic imposed characteristic time of applied stress or the characteristic time of macroscopic deformation. The results demonstrate that the modified free volume model can characterize the strain rate effect in BMGs effectively.     

Influence of Misalignment on High-Order Aberration Correction for Normal Human Eyes

Although a compensation device can correct aberrations of human eyes, the effect will be degraded by its misalignment, especially for high-order aberration correction. We calculate the positioning tolerance of correction device for high-order aberrations, and within what degree the correcting effect is better than low-order aberration （defocus and astigmatism） correction. With fixed certain misalignment within the positioning tolerance, we calculate the residual wavefront rms aberration of the first-6 to first-35 terms along with the 3rd-Sth terms of aberrations corrected, and the combined first-13 terms of aberrations are also studied under the same quantity of misalignment. However, the correction effect of high-order aberrations does not meliorate along with the increase of the high-order terms under some misalignment, moreover, some simple combined terms correction can achieve similar result as complex combinations. These results suggest that it is unnecessary to correct too much the terms of high-order aberrations which are difficult to accomplish in practice, and gives confidence to correct high-order aberrations out of the laboratory.     

Exact Periodic Solitary-Wave Solution for KdV Equation

A new technique, the extended homoclinic test technique, is proposed to seek periodic solitary wave solutions of integrable systems. Exact periodic solitary-wave solutions for classical KdV equation are obtained using this technique. This result shows that it is entirely possible for the （l ＋ l）-dimensional integrable equation that there exists a periodic solitary-wave.     

Periodic Homoclinic Wave of （1＋1）-Dimensional Long-Short Wave Equation

The exact periodic homoclinic wave of （1＋1）D long-short wave equation is obtained using an extended homoclinic test technique. This result shows complexity and variety of dynamical behaviour for a （1＋1）-dimensional long-short wave equation.