氟化钡晶体质子辐照的正电子湮没寿命谱研究

采用正电子湮没寿命谱方法研究BaF2晶体质子辐照效应.研究能量为1.5MeV和2.0MeV质子辐照BaF2晶体的正电子湮没寿命谱,比较两种情况下受照晶体的辐照损伤.正电子湮没寿命谱说明BaF2晶体质子辐照的电离效应显著,由于电离会使晶体中少量金属离子产生变价效应,引起位移损伤.1.5MeV能量的质子辐照比2.0MeV能量的质子辐照产生的位移损伤大.     

水泥矿山中深孔爆破震动信号频谱特征分析

为了更好地研究爆破震动波及其对建（构）筑物的影响，用离散小波变换对中深孔爆破震动渡进行消噪处理，井对消噪后的震动信号进行时一能密度分析和频谱分析。分析表明，在此地质条件下震动信号的能量主要集中在5—45Hz频率段的波形中；爆破段间隔时间在100ms左右时降振效果明显。     

Optical properties of CdS sintered film

Chemical method has been used to prepare cadmium sulphide by using cadmium, hydrochloric acid and H₂S. The reflection spectra of covered and uncovered sintered films of CdS have been recorded by ‘Hitachi spectrophotometer’ over the wavelength range 300–700 nm. The energy band gaps of these films have been calculated from reflection spectra. It is found that the energy band gap of both films is same as 2.41 eV. It is indicated that energy band gap of these films does not change. This value of band gap is in good agreement with the value reported by other workers. The measurement of photocurrent has also been carried out using Keithley High Resistance meter/ Electrometer. This film shows the high photosensitivity and high photocurrent decay. Thus so obtained films are suitable for fabrication of photo detectors and solar cells.     

C2H2／H2比率对铝合金上电弧离子镀类金刚石膜的结构和腐蚀性能的影响

本文研究了在2024铝合金衬底上，环境气氛中C2H2／H2比率对电弧离子镀沉积类金刚石膜层的结构和腐蚀性能的影响。Raman谱分析表明，随着C2H2／H2比率的降低，其D峰和G峰的强度比ID／IG值增加，这意味着膜层中sp^3／sp^2键比率减少，膜层的力学性能下降；同时，G峰的峰位向高波数方向移动，峰的半高宽变窄；D峰的峰位也在向高波数方向移动变化，但峰的半高宽变化相反，逐渐宽化。膜层可以进一步提高铝合金试样的抗腐蚀能力，从自腐蚀电位看，随着C2H2／H2比率的降低，膜层试样的抗腐蚀性能略逐渐增加。     

A numerical analysis of the elastic-plastic peel test

The adhesive fracture energy, G_c, is determined from two types of elastic-plastic peel tests (i.e. the single-arm 90° and T-peel methods) and a linear-elastic fracture-mechanics (LEFM) test method (i.e. the tapered double-cantilever beam, TDCB method). A rubber-toughened epoxy adhesive, with both aluminium-alloy and steel substrates, has been used in the present work to manufacture the bonded joints. The peel tests are then modelled using numerical methods. The overall approach to modelling the elastic-plastic peel tests is to employ a finite-element analysis (FEA) approach and to model the crack advance through the adhesive layer via a node-release technique, based upon attaining a critical plastic strain in the element immediately ahead of the crack tip. It is shown that this ‘critical plastic strain fracture model (CPSFM)’ results in predicted values of the steady-state peel loads which are in excellent agreement with the experimentally-measured values. Also, the resulting values of G_c, as determined using the FEA CPSFM approach, have been found to be in excellent agreement with values from previously-reported analytical and direct-measurement methods. Further, it has been found that the calculated values of G_c are independent of whether a standard LEFM test or an elastic-plastic peel test method is employed. Therefore, it has been demonstrated that the value of the adhesive fracture energy, G_c, is independent of the geometric parameters studied and the value of G_c is indeed a characteristic of the joint, in this case for cohesive fracture through the adhesive layer. Finally, it is noted that the FEA CPSFM approach promises considerable potential for the analysis of peel tests which involve very extensive plastic deformation of the peeling arm and for analysing, and predicting, the performance of more complex adhesively-bonded geometries which involve extensive plastic deformation of the substrates.     

我国电价时间序列混沌特性分析及电价预测

本文在分析电价时间序列形成机理的基础上,分析了我国电价时间序列的的混沌特性,通过国内外电价时间序列的比较,证明了传统的基于电价时间序列周期性的预测方法在我国电力市场不能取得较好结果的原因。并利用我国电力市场电价时间序列和负荷时间序列的混沌相关性建立模型,该模型可以很好的解决我国四川电网日前市场和实时市场的电价预测问题,该改进模型对“价格钉”具有一定的预测能力,并为“价格钉”预测提供一种思路。     

炉膛火焰检测与燃烧诊断

对炉膛火焰特征与火焰检测和诊断的关系进行了分析；对火焰检测的基本原理和方法以及燃烧诊断理论和技术进行了论述；并对目前火电厂燃煤锅炉应用的各种火焰检测器和燃烧诊断系统进行了分析比较，最后讨论了火焰检测和燃烧诊断技术的进一步研究方向。     

两株海洋聚球蓝细菌(Synechococcus spp.)的16s rDNA系统发生及生理生态特征分析

利用流式细胞仪分析了黄海近海水样中聚球蓝细菌(Synechococcus)种群的组成,发现主要由藻红蛋白含量不同的两个类群组成.流式细胞仪分选后,用SN培养基培养纯化得到两株聚球蓝细菌IOCAS0401和IOCAS0402.荧光显微镜下镜检,两株菌在蓝色激发光(450～490nm)下发橘红色荧光,并且IOCAS0401的荧光较IOCAS0402强.扫描电镜观察发现IOCAS0401呈椭圆形,长轴大约1.2μm;IOCAS0402近似球形,直径约0.6μm.吸收光谱的检测表明,两者都有叶绿素a和藻红蛋白的特征吸收峰.其中IOCAS0401有藻尿胆素(PUB)和藻红胆素(PEB)吸收锋,而IOCAS0402只有PEB的吸收峰,两者均无藻蓝蛋白(PC)吸收锋.通过16s rDNA测序分析,结果表明两株菌都位于MC-A中的clade II类群,与从日本海域分离获得的MBIC10224菌株有较高的亲缘关系,虽然这三株菌都归为clade II,但单独成一分支,表明它们带有明显的西太平洋特色.     

Electrochemical impedance spectra of V_2O_5 xerogel films with intercalation of lithium ion

1INTRODUCTION Vanadiumpentoxidexerogel(VXG)filmshavereceivedsignificantattentionduringthelasttwo decadesduetotheirbroadindustrialapplicationsespeciallyinopticalswitchingdevices[1,2],electro chromicdevices[3]andreversiblecathodesforlithi umrechargeablebatteries.ThecommonmethodsofpreparingVXGfilmsareconventionaltech niques,includingpulsedlaserdeposition[4],sput tering[5]andvacuum deposition[6].However,suchmethodsalwaysinvolveconditionsofhightemper atureandvacuum,whichrequirecomplicated…     

Mechanism of flue gas simultaneous desulfurization and denitrification using the highly reactive absorbent

Using slurry mixed by fly ash and alkaline material, removal of SO2 in industrial waste gas had been reported in the 1970s, which was named the wet scrubbing[1]. Sincethen, there have been many reports about flue gas desulfurization using the reactive ab- sorbent prepared with flying ash. There are four kinds as follows: (1) Using slurry of fly ash as absorbent[2―4], which mainly utilize the property of fly ash for desulphurization, but the removal efficiency is not high. (2) Using fly ash a…