微波辐射下ZrO2/S2O82-催化合成芳香磺酰亚胺

微波辐射无溶剂条件下,以ZrO2/S2O82-固体超强酸为催化剂,使芳香醛与芳香磺酰胺作用合成了一系列芳香磺酰亚胺类化合物,收率为75%～94%.此方法具有操作简便,催化剂价廉易得、活性高、对环境友好、可回收重复使用等优点.     

钴-亚硝基R盐体系的电化学研究

钴(Ⅱ)与亚硝基红盐(NRS)、氯代十四烷基吡啶(TPC)所形成的三元络合物在示波器极谱仪上产生一灵敏的二阶导数极谱波,比没有TPC存在时,峰高增加近20倍.在7.0×10-10～6.0×10-6mol/L的范围内,钴(Ⅱ)的浓度与峰电流有良好的线性关系,检出限为1.4×10-10 mol/L(8.0 ng/L).研究了络合物的电化学行为,经计算得到Co(Ⅲ)-NRS-TPC三元络合物的配比为136,稳定常数为6.5×1037,三元络合物在电极表面的吸附符合福兰克林方程,吸附系数(β)为1.21×105 L/mol,饱和吸附量(Гs)为9.8×10-10 mol/cm2,吸引因子(v)为0.96.     

工业企业顾客满意度测评指标体系研究

质量管理已发展到“以顾客为关注焦点”的阶段。了解顾客需求,满足顾客期望,使顾客满意,是企业在激烈的市场竞争中的立足之本。产品是否合格需要检验,顾客是否满意就需要测评,而在顾客满意度测评中,测评指标体系的确定是至关重要的环节。本文根据顾客满意度测评基本模型,介绍了制定顾客满意度测评指标体系的原则、应考虑的主要因素,在此基础上给出了顾客满意度测评指标体系。     

流体包裹体精细分析在塔中志留系油气成藏研究中的应用

利用均一温度、荧光光谱、红外光谱、三维荧光光谱(TSF)、色谱-质谱(GC-MS)等流体包裹体分析技术对塔中志留系油气藏的复杂油气成藏过程进行研究。结果表明:塔中志留系储层中发育3期不同类型的烃类包裹体;确定塔中志留系油气藏的3期成藏过程,即在泥盆纪沉积末期中下寒武统来源的原油第I期成藏,泥盆纪末构造抬升剥蚀遭受破坏形成残余沥青;二叠纪沉积末期中上奥陶统来源的原油第Ⅱ期成藏;喜山期中下寒武统来源的深部调整油气第Ⅲ期成藏;现今油气主要为第Ⅱ期和第Ⅲ期成藏的油气混合。     

LD双端端面泵浦的高功率连续单频Nd:YVO4激光器

研制了高功率连续单频Nd：YVO4激光器。在考虑激光晶体因吸收泵浦光而产生的热透镜效应的基础上，设计了六镜环行激光谐振腔，采用两个光纤耦合输出的高功率激光二极管双端端面泵浦结构，在总泵浦功率为32．3W的情况下，得到10．4W的单频1．064μm红外输出，斜效率为43．7％，长期功率稳走性优于1％(4h)，激光器自由运转时的频率漂移小于150MHz（1min)。     

LD端面泵浦Nd:YAG/BIBO单模蓝光激光器

从理论上分析了准三能级系统946 nmNd:YAG全固态激光器运转的条件,并比较了几种不同的倍频晶体的特性,给出内腔倍频获得473 nm蓝光发射的方案。用波长808 nm、输出功率为2.2 W的半导体激光器泵浦Nd:YAG,采用内腔倍频的方法,在一定的温度下,用Ⅰ类临界相位匹配B IBO晶体倍频获得了473 nm 26.5 mW的单模连续蓝色激光输出,功率波动小于±5%。     

Influence of the randomly varying domain length of quasi—phase—matched crystals on quadrature squeezing performance

During the fabrication of quasi-phase-matched(QPM) devices,errors of periodic structure are usually inevitable.The errors result in the deviation of the actual periodic domain length from the theoretical value.In this paper,we numerically analyse the influence of errors on the quadrature squeezing performance of a degenerate optical parametric amplifier consisting of QPM devices.It is shown that errors significantly degrade the squeezing degree of the quadrature squeezed light.Due to the presence of the errors,the relative phase between the signal and the pump field for obtaining the maximum squezing depends on the propagation distance of light in the crystal and the pump power.     

Investigation on Characteristics and the Improving Method of Double Loop Optical Buffer

We establish an equivalent cascaded semiconductor optical amplifier system model to analyze the characteristics of the double loop optical buffer （DLOB）. The theoretical analysis finds that the performance of the DLOB can be improved by inserted amplifying process in an interval of some cycles. The experiment demonstrates that the buffered cycles can be improved from 20 to 50 and the bit error rate is less than 10-9 by inserting amplifying process in an interval of about 10 cycles.     

Experimental measurement of radiation dose in a dedicated breast CT system

Radiation dose is an important performance indicator of a dedicated breast CT (DBCT). In this paper, the method of putting thermoluminescent dosimeters (TLD) into a breast shaped PMMA phantom to study the dose distribution in breasts was improved by using smaller TLDs and a new half-ellipsoid PMMA phantom. Then the weighted CT dose index (CTDI_w) was introduced to average glandular assessment in DBCT for the first time and two measurement modes were proposed for different sizes of breasts. The dose deviations caused by using cylindrical phantoms were simulated using the Monte Carlo method and a set of correction factors were calculated. The results of the confirmatory measurement with a cylindrical phantom (11 cm/8 cm) show that CTDI_w gives a relatively conservative overestimate of the average glandular dose comparing to the results of Monte Carlo simulation and TLDs measurement. But with better practicability and stability, the CTDI_w is suitable for dose evaluations in daily clinical practice. Both of the TLDs and CTDI_w measurements demonstrate that the radiation dose of our DBCT system is lower than conventional two-view mammography.     

利用马赫-增德尔干涉仪改善光纤激光器输出激光性能的研究

本文设计了马赫-曾德尔干涉仪(MZI)在实验上改善1.5μm光纤激光器的输出性能,研究了MZI分束镜的反射率以及锁定MZI透过率对抑制激光输出噪声的影响。在MZI运转于最佳状态时,1.5μm光纤激光器的功率稳定性由±0.20%提升至±0.09%,激光的强度噪声在10 kHz^35 kHz分析频率范围内得到了抑制,在分析频率为15 kHz处,强度噪声降低了约8 dB,为制备1.5μm非经典光场提供了优质激光光源。