Polarization Control with Piezoelectric and LiNbO3 Transducers

Several Polarization control transducers have appeared on the market, and now automated, endless polarization control systems using these transducers are becoming available. Unfortunately it is not entirely clear what benchmark performance tests a polarization control system must pass, and the polarization disturbances a system must handle are open to some debate. We present quantitative measurements of realistic polarization disturbances and two benchmark tests we have successfully used to evaluate the performance of an automated, endless polarization control system. We use these tests to compare the performance of a system using piezoelectric transducers to that of a system using LiNbO3 transducers.     

Polarization Control with Piezoelectric and LiNbO3 Transducers

Several Polarization control transducers have appeared on the market, and now automated, endless polarization control systems using these transducers are becoming available. Unfortunately it is not entirely clear what benchmark performance tests a polarization control system must pass, and the polarization disturbances a system must handle are open to some debate. We present quantitative measurements of realistic polarization disturbances and two benchmark tests we have successfully used to evaluate the performance of an automated, endless polarization control system. We use these tests to compare the performance of a system using piezoelectric transducers to that of a system using LiNbO3 transducers.     

Focusing of Surface Acoustic Wave on a Piezoelectric Crystal

We investigate the focusing phenomena of a surface acoustic wave （SAW） field generated by a circular-arc interdigital transducer （IDT） on a piezoelectric crystal. A rigorous vector field theory of surface excitation on the crystal we developed previously is used to evaluate the convergent SAW field instead of the prevalent scalar angular spectrum used in optics. The theoretical results show that the anisotropy of a medium has great impact on the focusing properties of the acoustic beams, such as focal length and symmetrical distributions near the focus. A dark field method is used in experiment to observe the focusing of the SAW tield optically. Although the convergent phenomena of SAW field on the anisotropic media or piezoelectric crystals are very complicated, the experimental data are in agreement with those from the rigorous theory.     

Theoretical and Experimental Investigation of Ultrasonic Focusing with Annular Phased Array

The focused acoustic field generated by an annular array interface are investigated theoretically and experimentally. transducer and its reflection field on a solid-liquid Theoretically, the concise analytic expressions about the radiation and reflection acoustic fields of the annular phased array are obtained by the ray approach method （saddle-point method）. In experiment, an annular transducer with 8 equal-area elements is designed and fabricated, and a series of experiments about the radiation acoustic field and its reflection on the liquid-solid interface are carried out. The experimental characteristics of the transducer are in good agreement with the numerical ones. It shows the correctness of the theoretical result and the feasibility of dynamic focusing of the experiment system. With the maximum amplitude and its emergence time of the reflection wave, we can acquire the information and the imaging of the reflection interface by the annular phased array dynamic focusing.     

New Developments in Laser Diagnostics for Tokamak Plasmas

New types of infrared and far-infrared lasers can be used to make otherwise impossible measurements of plasma parameters in the next generation of large tokamaks. Recent progress in the development of such new diagnostic techniques is reviewed.     

光外差超声无损探伤系统的实验设计和信号处理

对光外差超声无损探伤实验系统的结构、原理进行了说明.分析了系统参数设计中信号光与本振光的光程差、探测器的相对位置和聚焦透镜的焦距这三个要素对外差效率的重要影响,根据理论计算所设计的光外差超声无损探伤系统,外差效率可达0.965.该系统用于由脉冲激励超声工件的内部探伤,观察到距离1 555 mm处钢管微小裂缝的超声反射信号.对零差信号利用三角函数拟合和最小二乘法进行数学处理,可测得裂缝处相对探测点的距离,相对误差为0.19%,可以达到对金属管道远程无损探伤的要求.     

Colloidal,Functional, Piezoelectric BaTiO3-Au Nanohybrid for Wireless Cell Therapy

Ultrasound-assisted reactive oxygen species (ROS) generation from piezoelectric nanomaterial offers unique wireless therapeutic approach in remote places. In the previous work, piezoelectric barium titanate (BaTiO₃) nanorod have been synthesized and used for wireless cell therapy. However, the piezoelectric property of BaTiO₃ nanorod needs further improvement for diverse applications. In this work, it is shown that gold nanoparticle conjugation with BaTiO₃ nanorod (BaTiO₃-Au) can significantly enhance the piezoelectric performance with the piezoelectric constant value of 110 pm V⁻¹. The colloidal BaTiO₃-Au is further functionalized with folate for selective targeting of folate-overexpressed cancer cells and used for wireless cell therapy via intracellular ROS generation under ultrasound exposure. The synthesized colloidal nanohybrid can be used for various therapeutic applications.     

眼镜光学技术的新进展

本文从光学材料、表面处理、镜片设计等方面阐述用于眼镜片的新技术,还简要介绍了液晶和电致变色器件(ECD)在眼镜光学技术中的应用。     

Statefinder and Om Diagnostics for Interacting New Holographic Dark Energy Model and Generalized Second Law of Thermodynamics

In this work, we have considered that the flat FRW universe is filled with the mixture of dark matter and the new holographic dark energy. If there is an interaction, we have investigated the natures of deceleration parameter, statefinder and Om diagnostics. We have examined the validity of the first and generalized second laws of thermodynamics under these interactions on the event as well as apparent horizon. It has been observed that the first law is violated on the event horizon. However, the generalized second law is valid throughout the evolution of the universe enveloped by the apparent horizon. When the event horizon is considered as the enveloping horizon, the generalized second law is found to break down excepting at late stage of the universe.     

HIRFL的辐照治癌终端

为了进行重离子束流的肿瘤治疗和生物效应的研究,HIRFL正在建造一个辐照治癌终端.主要介绍了该终端的束流制备方法和束流线的布局、性能参数和束流光学设计计算结果. A new experimental terminal is being constructed at HIRFL for research program of proton and heavy ion therapies and irradiation effects of living things . The beam preparation method and the layout, performance and beam optics calculation of the beam line are presented.     

光动力学疗法新型光敏剂的光谱特性研究

实验研究了用于光动力学诊断和治疗的新型光敏剂二磺基二邻苯二甲酰亚胺甲基酞菁锌（ZnPcS2P)癌光啉（PsD-007)、血啉甲醚（HMME）以及早期应用于临床的血卟啉衍生物（HpD)分别在生理盐水和含10％人血清生理盐水中的光谱特性。结果表明：除ZnPcS2P2的最大吸收峰位于670nm之外，其余三种光敏剂在人血清环境中的最大吸收峰都位于405nm处，但与生理盐水环境相比索瑞（Soret)峰发生了12nm的红移。在波长为413和514.5nm光源激发下，HMME，HpD和PsD-007在人血清环境中的荧光发射峰都分别位于625和690nm，但413nm光源的激发效率比514.5nm光源高出3倍左右，而且HEEM的荧光激发效率最高，HpD次之，PsD-007最低。     

压电陶瓷压电特性的激光调制法测量研究

介绍可测量压电陶瓷压电特性的激光干涉调制测量方法.采用相干检测原理对信号进行提取,不仅可以抑制噪声对干涉信号的影响,而且还可以大大降低光电探测器和电路的1/f噪声.与通常干涉仪测量方法相比,这种方法具有测量灵敏度高等优点.利用该方法对压电陶瓷压电特性进行了测量,讨论了激励电压信号的频率、幅度对压电陶瓷压电常数d₃₁的影响,并对其压电迟滞曲线进行了测量.     

L波段射频加速器电子束微脉冲诊断

 利用切伦柯夫辐射的瞬时发光机理,把相对论电子束打在熔石英靶片上转化为可见光,再用皮秒扫描相机进行测量,就可得到射频直线加速器皮秒电子束微脉冲的峰值电流及微脉冲束团。采用该方法,对L波段射频直线加速器的电子束微脉冲宽度和束团结构进行了诊断。由此构建了一套加速器电子束微脉冲的在线测量系统,该系统对调整加速器工作状态、提高束流品质使之适应自由电子激光要求起到了重要作用。     

New Opportunities for Colorectal Cancer Diagnostics Using an Optical Cell Detection System Based on Dielectrophoresis

Optics and Spectroscopy - The possibilities of using electrical and viscoelastic parameters of erythrocytes in patients with colorectal cancer (CRC) of different stages were demonstrated using...     

THz电磁场的新型电光探测技术及应用

介绍了一种基于线电光效应和适用于探测自由空间传播ＴＨｚ是磁辐射场的新型电光技术及潜在应用，给出最新的实验研究成果，综合比较得出用电光晶体探测ＴＨｚ电磁辐射波形明显优于传统光导偶极天线探测技术，并指出该新型电光探测系统在实时二维远红外成像技术应用中有很好的发展前景。     

A New Fluorescent Probe, ABM: Properties and Application in Clinical Diagnostics

Properties of benzanthrone aminoderivative ABM (conditional name) as a potential fluorescent probe were investigated. Spectral characteristics of the compound in different solvents as well as their binding to model lipid membranes (liposomes) and human peripheral blood mononuclear cells (lymphocytes; ly) were determined. The fluorescence was found to be sensitive polarity changes to the environment. Distinctions were observed in the spectral characteristics of the investigated compound when bounded to liposomes. It was established that spectral characteristics of ABM in cell suspension qualitatively characterize the structural and functional alterations of ly during pathological phenomena and correlate directly with the clinical view of disease. The ABM is shown to be a perspective in the screening for various pathologies.     

新型光动力学疗法光敏剂5-ALA-GNPs的制备及其光谱分析

通过聚二烯丙基二甲基胺盐酸盐和氯金酸制备阳离子纳米金,将纳米金和5-氨基乙酰丙酸(5-aminolevulinic acid, 5-ALA)通过静电吸附作用有效结合得到新型光敏剂。应用共振瑞利散射光谱, 紫外-可见吸收光谱, 透射电镜和激光散射等方法对其进行了表征。结果表明通过这种方法纳米金与5-ALA可以有效结合。这种新型光敏剂对提高光动力学疗法临床疗效具有重要指导意义。     

CiADS固态功率源的可用性设计与分析

ADS加速器面临的一大技术挑战是高可用性要求,进行固态功率源可用性设计是为ADS加速器的可用性设计与分析做准备。首先对CiADS的可用性要求进行了分配,固态功率源的分配结果为0.999;然后对固态功率源进行了初步可用性设计,分析的结果无法满足要求;最后对固态功率源进行了冗余设计,使用Reliasoft软件建立了固态功率源的可靠性框图,分析结果显示:满足一定的维修条件下,当其他元件的平均故障间隔时间（MTBF）达到171 702 h,25/28冗余设计可以满足0.999的可用性要求。One of the challenging technologies of ADS is the high availability requirement. The availability design of the solid-state amplifier is the preparation for ADS. Firstly the availability requirement of CiADS is proposed as 0.8. The distribution result of the solid-state amplifier is 0.999 according to this requirement. Then the availability result shows the preliminary design of solid-state amplifiers can not reach the availability requirement. At last the power loss is considered to build the k/N redundancy model of the main amplifier and the mean time between failure (MTBF) is calculated for various redundancy models. The reliability block diagram of the solid-state amplifier is set up by Reliasoft and the simulation results show that the 25/28 redundancy model can meet the requirement 0.999 when MTBF of other components reaches 171 702 hours with the certain maintenance.