细长体倾斜出水的实验研究

为了获得细长体倾斜出水空泡生成、发展及溃灭过程,基于高速摄像系统对细长体小倾角倾斜出水过程进行了实验研究。通过对比细长体垂直及倾斜带泡出水过程,分析了倾斜出水过程中体现出的新特征及其影响因素。在此基础上,对不同初始倾角及细长体头型对出水轨迹及姿态的影响规律进行了实验研究:细长体姿态及轨迹变化与其初始倾角并非线性相关,与肩空泡的闭合位置密切相关;细长体头型变钝,其水下运动过程稳定性增加。     

利用Raman相互作用实现未知原子态的传输

利用Λ型三能级原子与单模腔场之间的相互作用,研究简并喇曼相互作用过程中产生场-原子最大纠缠态的方法,实现量子逻辑门的方法,以及如何利用这种方法来实现未知原子态的量子隐形传送.     

A cost-effective structure of a centralized-light-source WDM-PON utilizing inverse-duobinary-RZ downstream and DPSK upstream

In this paper, we propose a new structure of a centralized-light-source wavelength division multiplexed passive optical network (WDM-PON) utilizing inverse-duobinary-return-to-zero (inverse-duobinary-RZ) downstream and DPSK upstream. It reuses downstream light for the upstream modulation, which retrenches lasers assembled at each optical network unit (ONU), and ultimately cuts down the cost of ONUs a great deal. Meanwhile, a 50-km-reach WDM-PON experiment with 10-Gb/s inverse-duobinary-RZ downstream and 6-Gb/s DPSK upstream is demonstrated here. It is revealed to be a novel cost-effective alternative for the next generation access network.     

抗血管生成药物Endostantin作用下实体肿瘤血管生成的数值模拟:考虑基质力学环境及血管生成抑素的影响

为研究抗血管生成药物Endostatin作用下,肿瘤血管生成过程中基质力学环境及血管生成抑素的影响,考虑内皮细胞(EC)和细胞外基质(ECM)两相,耦合抗血管生成药物Endostatin和血管生成抑素Angiostatin的抑制效应,建立肿瘤内外血管生成的二维数值模型.抗血管生成因子Angiostatin和药物Endostatin耦合作用时,可明显降低肿瘤组织内的微血管密度,对肿瘤快速生长起到一定的抑制作用.所给出的模型,可以较好模拟基质力学环境影响下,肿瘤抗血管生成因子对内皮细胞迁移和增殖的抑制作用.     

利用简并Λ型三能级原子与单模腔场的Raman相互作用制备压缩态的叠加态

本文提出利用简并Λ型三能级原子与单模腔场的Raman相互作用制备压缩相干态的叠加态的一种新方案,并对单模压缩相干态光场中有关压缩角(即压缩方向)的控制问题进行了详细讨论.     

相对流量技术及其在电子碰撞微分散射截面测量中的应用

为了提高原子分子动力学参数的测量精度,本文把气体相对流量技术应用到快电子碰撞研究中. 并且在此基础上测量了氙原子6s激发的广义振子强度,所得结果在小动量转移区间与前人的结果符合很好,表明气体相对流量技术在电子碰撞方法中的适用性. 大动量转移区间6s的表观广义振子强度对电子碰撞能量的依赖行为,说明500eV的电子碰撞能量还不满足一阶玻恩近似条件. 与Hartree-Fock方法相比,考虑电子关联效应更全面的随机相移近似计算结果与本文的实验结果符合更好,说明对于像Xe这样的重原子,电子关联效应十分重要.     

3D numerical simulation of avascular tumour growth: effect of hypoxic micro-environment in host tissue

A three-dimensional （3D） mathematical model of tumour growth at the avascular phase and vessel remodelling in host tissues is proposed with emphasis on the study of the interactions of tumour growth and hypoxic micro-environment in host tissues. The hybrid based model includes the continuum part, such as the distributions of oxygen and vascular endothelial growth factors （VEGFs）, and the discrete part of tumour cells （TCs） and blood vessel networks. The simulation shows the dynamic process of avascular tumour growth from a fewinitial cells to an equilibrium state with varied vessel networks. After a phase of rapidly increasing numbers of the TCs, more and more host vessels collapse due to the stress caused by the growing tumour. In addition, the consumption of oxygen expands with the enlarged tumour region. The study also discusses the effects of certain factors on tumour growth, including the density and configuration of pre- existing vessel networks and the blood oxygen content. The model enables us to examine the relationship between early tumour growth and hypoxic micro-environment in host tissues, which can be useful for further applications, such as tumour metastasis and the initialization of tumour angiogenesis.     

电动多通道切换分析系统在溶剂萃取分析中的应用

采用电动多通道切换分析系统,完成了水中铜的在线显色、溶剂萃取和光度测定,并证明了其应用的可行性;通过流路中切换器件的组合和控制软件的编写,该流动分析系统具有简便、灵活、多功能和易控制等特点;本分析系统由1台电渗泵和4个电磁切换阀组成;电渗泵是一种无脉动的液流驱动装置,易于计算机控制,更适用于多通道切换分析系统;本文还对有机泵载流及其添加剂进行了探讨;以水中铜的测定为例．方法的检出限为0．03mg/L．回收率在92％～96％范围．测样频率20样／h。