H_2O_2抑制镍阴极长气孔的研究

本文通过对H_2O_2分解动力学性质的研究与溶液表面张力及稳态极化曲线的测定,探讨了H_2O_2在NiSO_4-Na_2SO_4-NaCl-H_3BO_4体系中的行为以及H_2O_2抑制氢气生成的根本原因,并提出有H_2O_2存在时,氢在镍电极表面放电符合均相平行转化机理。     

自电、激电在油气勘探中的应用

文章论述了油气藏上方自电、激电异常的成因和应用。通过实际工作验证,提出了全新的自电工作方法和技术。构制了工作区特殊的油气藏激电异常成因模型。     

氮化40Cr制作潜水泵主轴的研究

研究了40Cr钢经辉光离子氮化处理取代3Cr13钢制作潜水泵轴的可行性。讨论了氮化对40Cr钢组织、耐磨性、耐蚀性及变形的影响。结果表明:40Cr钢经辉光离子氮化处理后,与3Cr13钢相比,具有优良的耐磨性、耐蚀性和尺寸稳定性。采用此种工艺制作潜水泵轴,性能上符合要求,而且成本低,具有明显的经济效益。     

云南大学教育调频广播台的建设与完善

对云南大学教育调频广播台的建台宗旨、发射台址、功率、频率和发射复盖区等作了全面论述，并将复盖区内的实测场强值与设计数值进行了分析对照。     

Watt型机构及其诱导机构的曲柄存在条件

本文采用平面杆机构的三角形划分法及主动杆瞬时凝结法探讨了单自由度平面六杆机构的一种基本型式——Watt型机构的曲柄存在条件;并用取极限的方法得到了其诱导机构(具有一滑块)的曲柄存在条件。     

双光子共振激发钠原子的参量过程

用激光观光子共振激发的原子使４ｄ２Ｄｊ态布居。自该态同时辐射两个光子回到基态，它们在钠蒸汽中传播时增强成为相干辐射，这过程称为参量过程．本文从实验上研究了参量过程谱线所包含的分量数目、各分量的波长和强度随激光波长、蒸汽温度的变化关系，并给出了基于原子极化、耦合波方程和位相匹配条件的理论分析。理论值和实验结果符合。     

单点馈电椭圆形微带贴片圆极化天线的分析与设计

利用椭圆微带贴片的几何轴比接近于1,将椭圆贴片看成是圆形贴片,加上一些微扰⊿S,采用圆形微带腔内的模式分析,推导出了便于工程应用的椭圆形微带贴片圆极化天线的设计公式。井据此设计了三公分椭圆形微带贴片圆极化天线元,获得了满意的结果。     

Measuring the Polarization Parameters of Rain by Inverse Scattering

The theory is presented for one method of determining the effective polarization parameters of the rain medium in the problem of polarization information processing of detecting target. The determination of the effective polarization parameters of the propagation medium is from the data of propagation measurements over a line-of-sight link. The polarization parameters the effective average value, the effective standard deviation and F the effective shape parameter of the propagation medium are obtained by means of the method of inverse scattering, showing a good agreement with the data from direct measurements.     

The Susceptibility of Non-UV Fluorescent Membrane Dyes to Dynamical Properties of Lipid Membranes

Fluorescence spectroscopy and microscopy are powerful techniques to detect dynamic properties in artificial and natural lipid membrane systems. Unfortunately, most fluorescent dyes that sense dynamically relevant membrane parameters are UV sensitive. Their major disadvantage is a high susceptibility to fluorescence bleaching. Additionally, the risk for hazardous damages in biological components generally increases with decreasing excitation wavelength. Therefore the use of non-UV–sensitive membrane dyes would provide significant advantage, particularly for applications in fluorescence microscopy, which usually implies high local excitation intensities. We applied steady-state fluorescence spectroscopy techniques to several UV and non-UV membrane dyes to detect and compare dynamically relevant excitation and emission characteristics. Small unilamellar liposomes (composed of egg yolk phosphatidylcholine) served as a model system for biological membranes. The dynamic properties of the membranes were varied by two independent parameters: the intrinsic cholesterol content (0–50 mol%) and temperature (10–50°C). We tested four non-UV–sensitive membrane dyes: 9-diethylamino-5H-benzophenoxazine-5-one (Nile Red), 4-(dicyanovinyl)julolidine (DCVJ), N-(3-triethylammoniumpropyl)-4-(4-(dibutylamino)styryl) pyridinium dibromide (FM 4-64), and 1,1-dioctadecyl-3,3,3,3-tetramethylindocarbocyanine perchlorate (DiIC₁₈). We also tested three derivatives of DiIC₁₈: DiIC₁₆ and DiIC₁₂ differ in acyl chain length and Fast-DiIC₁₈ provides double bonds between hydrocarbon atoms. The spectral results were compared to established fluorescence characteristics of four UV membrane dyes: the anisotropy of 1-6-phenyl-1,3,5,-hexatrien (DPH), two derivatives of DPH (TMA-DPH and COO^–-DHP), and the generalized polarization of 6-dodecanoyl-2-dimethyl-aminonaphthalene (Laurdan). Our results indicate that the tested non-UV dyes do not reveal dynamically relevant membrane parameters in a direct manner. However, spectral characteristics make DiIC₁₈, Nile Red, and DCVJ promising probes for the microscopic detection of lateral lipid organization, an indirect indicator of membrane dynamics. In particular, DiIC₁₈ showed very selective shifts in the emission spectra at defined temperatures and cholesterol contents that have not been reported elsewhere.