外光反馈静态和动态特性研究概况

Sb外光反馈现象一直是学术界十分关注的课题,并得到大量研究。其中,影响最深远的是Lang和Kobayashi在1980年所做的工作。他们利用复合腔模型建立了现在广为使用的Lang—Kobayashi速率方程,用以描述外部光反馈下SLs的动态行为,并利用该模型解释了绝大部分实验现象。     

Toxicity to the normal hemocytes by ALA-PDT for the ex vivo purging of hematopoietic stem cell grafts

Objective To study the toxic effects of 5-amionlevulinic acid-based photodynamic therapy (ALA-PDT) on human peripheral blood mononuclear cells (PBMCs), cord blood mononuclear cells (CBMCs) and peripheral blood stem cells (PBSCs), and furthermore, to understand the possible causes of this response. Methods We used MTT assay to detect the survival rate of PBMCs, CBMCs and PBSCs after treated by ALA-PDT under the optimum experiment conditions with U937 as control;Annexin V-FITC/PI was used to detect the pattern of cell death induced by ALA-PDT. By using flow cytometry, we detected intracellular PpIX fluorescence intensity. Results After ALA-PDT treatment the survival rate of PBMCs had no significant change;however in PBSCs and CBMCs, the survival rate reduced to 70%, and the survival rate of leukemia cell U937 was the lowest, about 30%. After incubation with ALA,except for PBMCs, intraceUuiar PplX fluorescence intensity of the other two kinds of normal haemocytes and U937 increased obviously. These results combined with the flow cytometry suggested that the main pattern of cell death here was apoptosts. Conclusion Under the optimum experiment conditions, ALA-PDT has a slight effect on normal haemocytes but excellent depletions of leukemia cells. Therefore, it can effectively purify autologons bone marrow or stem cell grafts.     

基于测距声纳与光视觉的水下目标定位方法研究

针对无人水下航行器作业环境的特殊性以及任务需求,为提高光视觉的定位精度,提出了一种基于测距声纳与光视觉的水下目标定位方法。该方法根据摄像机成像的特点,利用测距声纳与摄像机的几何关系设计水下目标定位算法。本文针对规则的水下目标进行定位算法设计,然后通过对水池试验采集的图像中的目标进行定位验证以及误差分析,证明了该定位系统具有较高的定位精度,满足水下作业的需求。     

某型调距桨装置桨毂组件光弹性试验研究

针对某型调距桨装置桨毂组件进行了三维光弹性实验研究。实验中,采用环氧树脂材料制成了桨毂组件缩比模型。加载与冻结实验后,对样件切片并在光弹性仪的圆偏振光场中进行数据采集。根据切片上的条纹级数并结合应力—光学定律,得到各测点应力值及应力分布。桨毂组件光弹性实验结果可以对桨毂组件应力进行全局性研究,对桨毂组件优化设计提供了有效依据。     

潜射弹道导弹传递对准方法研究

针对潜射弹道导弹如何快速完成传递对准的问题,分析潜射弹道导弹传递对准模式,建立基于速度和框架角匹配的传递对准模型,结合平方根滤波和H＿∞滤波中状态更新方程的特点,提出一种平方根/H＿∞混合滤波算法。结合潜艇可能的机动方式,分析变速直航机动、C型机动和S型机动过程中3种滤波算法的收敛性和传递对准误差。研究表明,潜射弹道导弹在进行传递对准时应该采用S型机动的方式,而且平方根/H＿∞混合滤波算法具有鲁棒性好的优点。     

相关法律法规在船舶登记中的应用

在办理船舶登记过程中,往往会遇到一些根据船舶登记条例无法解决的问题,必须要依据相关法律法规来确保其具备法律效力,解决问题顺利完成船舶登记工作。     

齿轮静态应力的光弹性实验研究

根据实验要求,设计了一套齿轮静态加载装置,利用光弹性法研究了一对聚碳酸脂全齿轮模型在啮合情况下的应力情况,采用计算机控制图象采集卡工作的采集方式采集等差线条纹图,并对等差线条纹图进行了图象处理。     

Wavelength reservation scheme with switch fabric status in distributed mesh optical networks

A new wavelength reservation scheme is proposed to mitigate the connection setup time and minimize the reconfiguration times of optical cross-connects (OXCs) for WDM optical networks in this study. In this scheme, we consider the reconfiguration information of switch fabrics in the signaling protocol, which is designated as the signaling with switch fabric status (SWFS). Distributed reservation algorithms will reserve the wavelength with minimum of reconfiguration times of OXCs along the route. Simulation results indicate that the proposed schemes with switch fabrics status have shorter setup time, lower switching ratio as well as better blocking performance than those of the traditional classic schemes. Moreover, the proposed schemes with SWFS significantly reduce the number of switch fabrics that need to be reconfigured. Foundation item: the National Natural Science Foundation of China (Nos. 60632010 and 60572029) and the National High Technology Research and Development Program (863) of China (No. 2006AA01Z251)     

ELVEX推出型号“RX-200”双光自行车眼镜

毫无疑问地,每个人都会越变越老,一旦我们到达了45岁左右,当面临一些小型印刷体时,眼睛就不那么好使了,与其在骑行过程中带上两付眼镜,还不如拥有这款Elvex出品的型号为“RX-200”的自行车运动眼镜。据悉,这款眼镜采用双光技术（远景及近物两用）,售价为12．60美金。     

NaCl：Eu^2＋的电子俘获机制研究

采用固相反应法制备了ＮａＣｌ：Ｅｕ＾２＋粉末样品,测量了发光和光激励发光特必上材料可记录用紫外光写入的信息,用绿光读出,读出信号的蓝光,本文初步探讨了这材料的电子俘获的机制。