概率一致反应谱的长周期外延

本文针对现行的抗震规范中设计反应谱应用范围只能到结构自振周期Ｔ≤３秒一现实问题，提出应用长周期地脉动的傅立叶振幅谱比值直接推算概率一地表长周期反应谱的方法。     

Ultra low frequeney electromagnetic wave anomaly and its spectrum characteristics before earthquakes

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Modelling of the nighttime nitrogen and sulfur chemistry in size resolved droplets of an orographic cloud

A chemistry module has been incorporated into a Lagrangian type model that computes the dynamics and microphysics of an orographical cloud formed in moist air flowing over the summit of Great Dun Fell (GDF) in England. The cloud droplets grow on a maritime aerosol which is assumed to be an external mixture of sea-salt particles and ammonium-sulfate particles. The dry particle radii are in the range 10 nm<r<1 µm. The gas-phase chemical reaction scheme considers reactions of nitrogen compounds that are important at night. The treatment of scavenging of gases into the aqueous phase in the model takes into account the different solubilities and accommodation coefficients. The chemistry in the aqueous phase focusses on the oxidation of S(IV) via different pathways.Sensitivity analyses have been performed to investigate deviations from gas-liquid equilibria according to Henry's law and also to study the influence of iron and of nitrogen compounds on the aqueous-phase oxidation of dissolved SO₂. When addressing these questions, special attention has been given to the dependence on the droplet size distribution and on the chemical composition of the cloud condensation nuclei on which the droplets have formed. It was found that the oxidation of S(IV) via a chain reaction of sulfur radicals can be important under conditions where H₂O₂ is low. However, major uncertainties remain with respect to the interaction of iron with the radical chain. It was shown that mixing of individual cloud droplets, which are not in equilibrium according to Henry's law, can result in a bulk sample in equilibrium with the ambient air. The dependence of the aqueous-phase concentrations on the size of the cloud droplets is discussed for iron, chloride and NO₃.     

植物冠层动量交换特征的实验研究

使用湍流梯度测试资料，对植物冠层动量交换特征进行了详细研究，结果表明:森林冠层内惯性副区能谱曲线仍可用幂指数描述，但斜率比-2/3更负；森林冠层内湍流尺度有变小的趋势；森林上层的耗散系数比下层大；由植被吸收引起动量及动量通量随冠层深度增加而明显减小；冠层下层的动量通量和耗散系数分别与上层的量有好的正相关；森林冠层内耗散系数和动量通量随大气稳定度有明显变化。     

单自由度陀螺寻北仪寻北数学模型研究

为了实现单自由度陀螺寻北仪自动寻北，通过分析寻北仅运动规律，本文建立了其寻北数学用到，分别为：模型Ⅰ——时间作为观测值，模型Ⅱ——角位置作为观测值，模型Ⅲ——时间及角位正同时作为观测值，楼四Ⅳ——最小二乘谱分析模型．通过模拟实验，认为自国对具有较强的抗干扰能力，适合单自由反陀螺寻北仪的数据采集和处理．     

“频谱分析法”在兰州市地下水水源地水情预报中的应用

利用“频谱分析法”预报地下水位经实际监测结果的误差检验，认为该方法用于地下水水源地水位预报是基本可行的。为今后广泛开展地下水情预测预报提供了一条有效途径。     

^29Si,^27Al Magic—Angle—Spinning Nuclear Magnetic Resonance（MAS NMR） Studies of Kaolinite and Its Thermal Transformation Products

²⁷Al,²⁹Si MAS NMR studies of kaolinite and its thermal transformation products show that in the kaolinite-mullite reaction series there is an extensive segregation of Al₂O₃ and SiO₂ and the reaction of Al₂O₃ with SiO₂ to form mullite is the main path of mullite formation. At about 850° C, the peak intensity of A1(V) reaches its maximum and with the further rise of temperature the A1(V) signal completely disappears. At about 950°C, γ-Al₂O₃ accounts for about 71% of the material phases containing Al atoms. In the series there is no obvious presence of Al-Si spinel. The²⁷Al and²⁹Si MAS NMR spectra show that there is an obvious difference between the temperature points for Al-O₂(OH)₄ octahedral sheet collapsing and Si-O₄ tetrahedral sheet breaking down.     

新型钻井液用广谱护壁剂（GSP）的研究

ＧＳＰ系采用多种组份经特殊工艺化学合成的钻井液用防塌降失水剂，探讨了ＧＳＰ的合成及其作用机理，经测试和应用表明：ＧＳＰ高效多能，集降失水，防塌，润滑于一体，同时还兼有良好的保护油气层功能，使用简便，技术经济效益显著。     

米波分米波太阳射电频谱观测研究

本文介绍了云南天文台米波分米波两个波段射电频谱仪的性能指标及可能的观测研究选题。     

A New Temperature Channel Selection Method Based on Singular Spectrum Analysis for Retrieving Atmospheric Temperature Profiles from FY-4A/GIIRS

Hyperspectral data have important research and application value in the fields of meteorology and remote sensing.With the goal of improving retrievals of atmospheric temperature profiles, this paper outlines a novel temperature channel selection method based on singular spectrum analysis(SSA) for the Geostationary Interferometric Infrared Sounder(GIIRS), which is the first infrared sounder operating in geostationary orbit. The method possesses not only the simplicity and rapidity of the principal component analysis method, but also the interpretability of the conventional channel selection method. The novel SSA method is used to decompose the GIIRS observed infrared brightness temperature spectrum(700-1130 cm~(-1)), and the reconstructed grouped components can be obtained to reflect the energy variations in the temperature-sensitive waveband of the respective sequence. At 700-780 cm~(-1), the channels selected using our method perform better than IASI(Infrared Atmospheric Sounding Interferometer) and Cr IS(Cross-track Infrared Sounder)temperature channels when used as inputs to the neural network retrieval model.