Molecular mechanisms of photochemotherapy (Review)

Mechanisms of photophysical, photobiological, and therapeutic action of light on blood in vivo are discussed based on results of spectral and clinical studies of blood, plasma, and erythrocytes. Spectral manifestations of photochemical reactions initiated in blood by therapeutic doses of radiation in vivo with light of different wavelengths are considered. Spectral and clinical results of blood investigations are compared for patients whose complex treatment included intravenous blood irradiation and magnetotherapy. Mechanisms for secondary (dark) reactions induced by the action of light on blood in vivo are discussed. The radiation of laser and non-laser light sources used at present for intravenous blood irradiation (365, 405, 450, 530, 632, 635, 808 nm) is shown to fall within hemoglobin absorption bands. The conclusion is made that blood absorption of laser and non-laser light radiation results in functional alteration of hemoglobin as a possible primary photoacceptor absorbing light radiation of the above wavelengths. The therapeutic effect of intravenous blood irradiation is initiated by hemoglobin functional activity modulation. Phototherapy is a means to correct it. Intravenous phototherapy should be considered as a therapeutic method that changes (provided that the dosage is correct) the balance of active oxygen species production and their inhibition by antioxidants. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 1, pp. 51–75, January–February, 2009.     

离子束合成钇硅化物的结构及红外谱特征

将稀土金属钇离子注入到n型单晶Si(111)中制备出钇硅化物埋层.利用x射线衍射、卢瑟福背散射和傅里叶红外吸收谱测量分析了样品的结构、原子的埋层分布和振动模式.结果表明，Y离子在注入过程中已与基底中的Si原子形成了YSi2结构相.真空下的红外光辐照处理促使YSi2择优取向生长，埋层中Si与Y的平均原子浓度比由24下降为20，与六方YSi2的化学计量比一致.还给出了钇硅化物的特征红外吸收谱.     

高温注氦及随后230MeV的208Pb27+辐照Al2O3的光致发光谱的研究

主要研究了110keV的He⁺高温注入Al₂O₃单晶及1.1MeV/u的²⁰⁸Pb²⁷⁺辐照注氦Al₂O₃样品的光致发光的特性. 从测试结果可以清楚地看到在375nm, 413nm和450nm处出现了强烈的发光峰. 并且在600K, 5×10sup>16ions/cm²剂量点, 样品的发光峰是最强的. 这 表明He⁺注入Al₂O₃后使带隙中深的辐射中心复合的效率大幅度提高, 极大的增强了其发光强度,而且发光伴随着蓝移现象. 而经过高能²⁰⁸Pb²⁷⁺辐照后的样品, 在390nm出现了新的发光峰,从FTIR谱中我们能够看到, 可能是²⁰⁸Pb²⁷⁺辐照相对沉积膜出现一定的晶化, 其中含有许多纳米尺寸的Al₂O₃晶粒所致.     

A new technique for the identification of ultrasonic flaw signals using deconvolution

The identification of ultrasonic flaw signals is a difficult task in the angle beam ultrasonic testing of welded joints due to the presence of non-relevant signals from the geometric reflectors such as weld-roots and counter-bores. This paper describes a new approach to identify ultrasonic flaw signals in such a problematic situation. A similarity function is defined as the deconvolution of a target signal by a reference signal. The similarity functions for the same type of flaws/references are symmetric bandlimited impulse-like patterns with larger amplitudes while those for different types of flaws/references are asymmetrical broad patterns with relatively smaller amplitudes. Therefore, ultrasonic signals could be identified by the pattern of the similarity function. In the initial experiments, the proposed technique showed great potential for identifying ultrasonic flaw signals in the inspection of weld joints.     

正交设计-紫外分光光度法测定青蒿中的青蒿素

以干青蒿叶为原料,考察石油醚萃取青蒿素的工艺条件,如温度、时间、溶剂量及超声功率等因素,正交法确定了最佳萃取工艺条件为温度40℃,超声功率90W,时间20min（两次）,液固比120∶1（mL.g-1）。紫外分光光度法直接测定不同产地青蒿中青蒿素的含量,结果表明：用超声波强化石油醚萃取青蒿素与常规浸泡法石油醚萃取比较,用超声波可以大大缩短萃取时间,提高了萃取率。     

Microstructure change in deuterium implanted CLAM steel induced by electron irradiation

As Reduced Activation Ferritic/Martensitic (RAFM) steel is considered the primary candidate for use as a structural material in fusion power reactors,many countries are developing different kinds of RAFM.China is developing new CLAM (China Low Activation Martensitic) steel.The study investigates microstructural changes in CLAM steel implanted with deuterium ions induced by 1250 keV electron irradiation from R.T.to 873 K,and observes both the growth and shrinkage of the defect clusters produced by deuterium ...     

p型金属氧化物半导体场效应晶体管低剂量率辐射损伤增强效应模型研究

对一种非加固4007电路中p型金属氧化物半导体场效应晶体管(PMOSFET)在不同剂量率条件下的电离辐射损伤效应及高剂量率辐照后的退火效应进行了研究. 通过测量不同剂量率条件下PMOSFET的亚阈I-V特性曲线,得到阈值电压漂移量随累积剂量、退火时间的变化关系. 实验发现,此种型号的PMOSFET具有低剂量率辐射损伤增强效应. 通过描述H⁺在氧化层中的输运过程,解释了界面态的形成原因,初步探讨了非加固4007电路中PMOSFET低剂量率辐射损伤增强效应模型. 关键词： p型金属氧化物半导体场效应晶体管 60Co γ射线')" href="#">⁶⁰Co γ射线 电离辐射损伤 低剂量率辐射损伤增强效应     

母线含非圆曲线的超声变幅杆精确加工的研究

介绍在普通数控车床上准确加工母线含非圆曲线的超声变幅杆的两种通用程序的编制方法及应用。方法一以等弦长划分待加工曲线决定节点,以平均曲率半径作为插补圆半径,以C语言编制出加工代码生成软件。方法二采用VB6编程,使用双圆弧法进行插补,伸缩步长法进行误差控制和决定节点,可设定并控制插补误差理论值,运行时生成的NC代码指令条数少,适应任何超声变幅杆的加工,界面友好易用。上述两程序在进行切削加工前,均可全程模拟加工过程。两软件经分别在GSK-928和G-CNC6135A(G)数控车床上应用,效果良好。而第一软件较完善。     

Stability analysis of the rotor of ultrasonic motor driving fluid directly

The stability of the rotor of ultrasonic motor driving fluid directly is a key to its applications and control. This paper introduced the acoustic streaming and acoustic viscous stress near the boundary layer. Following this, the effect of acoustic viscous force on the stability of the rotor of ultrasonic motor driving fluid directly was presented in detail. The result showed that this system can be equivalent to a mass-spring and the spring constant can be used to weigh the stability of the rotor. By this model and relevant experiments, factors that affect the stability of the rotor such as the driving frequency, the rotor's weight and radius, the saturated acoustic streaming velocity, the mode number of stator vibration, the fluid's height and type are investigated and useful guidelines for design and application are obtained.     

基于超声波测量技术的颗粒尺寸分布模型的研究

提出了一种利用单颗粒背向散射信号来进行粒径分布估算的超声波测量技术,系统阐述了其 理论基础及基本工作原理。被测颗粒的散射信号幅度与它在探测区中的位置、颗粒尺寸和形状有关。 通过理论分析,建立了一个可用于描述散射信号幅度概率分布与颗粒系尺寸分布之间关系的数学模 型,对该模型的反演计算便可得到颗粒系的尺寸分布信息。为了避免求解过程中的病态系数矩阵问 题,将模型求解转化成了易于解决的最优化问题。仿真实例结果验证了该技术的可行性。