ENSO对亚洲夏季风异常和我国夏季降水的影响

首先对ＥＮＳＯ过程中亚洲夏季风环流的变化进行了诊断分析，结果表明在Ｅｌ Ｎｉｎｏ事件和ＬａＮｉｎａ事件中亚洲夏季风系统各成员均发生不同程度的变化，甚至出现相反的变异特征。其中，对我国东部地区夏季降水进行了ＥＯＦ分析，并在此基础上分析了赤道太平洋ＳＳ－ＴＡ对我国东部地区夏季降水影响的区域和程度，该影响与ＥＮＳＯ循环的发展阶段密切相关，且在长江中下游地区和华南地区最为显著。     

Analysis of Spatial–Temporal Evolution of Mining-Induced Fracture Field: A Case Study Using Image Processing in the Shaqu Coal Mine,China

Natural Resources Research - Mining-induced fracture plays a key role in gas drainage for gas burst-prone underground coal mines, especially for closely multilayered coal seams. The layout and...     

流沙地区沙通量的计算与观测初议

本文在总结野外资料的基础上,讨论了局部沙通量系数、断面通量系数与高度、粒径之间的关系,验证计算沙通量-般公式,结果良好。     

MIS3晚期石笋记录的季风突变事件区域特征及全球联系

末次冰期晚期短尺度气候突变事件异常显著,对其研究有助于认识相似边界条件下气候突变规律。通过MIS3晚期亚洲季风区8支石笋记录总结分析发现,因受洞穴微环境、渗水通道、生长动力等影响,DO5~DO3事件振幅差最大可达0.9 ‰,持续时间差最大达到900年,这可能反映局地环境对同一气候信号的改造作用或与各记录分辨率及测年精度有关。同时,统计分析发现,这些短尺度DO事件具有一定相似性,其持续时间集中分布于特定范围,说明石笋同位素信号在某种程度上可以反映真实气候信号。高、低纬记录对比显示,石笋记录与低纬气候信号呈现诸多相似性,反映亚洲季风区石笋记录具有显著的"低纬特色"。因此,无论亚洲季风突变的"开关"是否归因于北高纬气候,低纬过程确实是不可或缺的"塑造者"。

     

牛心山花岗岩岩体特征及其与成矿的关系

本文较系统地阐述了牛心山花岗岩岩体的地质特征及岩体的成因,并结合华尖金矿区地质矿化特征,探讨了花岗岩体在时间、空间及岩浆演化方面与成矿的关系。     

贵州岩溶区地下河开发利用及其工程地质问题

<正> 一、前言云贵东部贵州高原亚热带岩溶化原野具有层状地貌的特点。岩溶地貌成因类型为溶蚀;溶蚀、侵蚀;溶蚀、构造三种。形成有峄顶齐高的峰丛、峰林与洼地、谷地;有中低山与沟谷、坡立谷、洼地;还有河流深切的峡谷、深谷与两岸阶地、台丘、平台,构成了多种组合类型。这些类型间隔而多级的分布在不同的高程上,总的趋势是由西往东形成阶梯状大斜坡,海拔高程由2900米,下降到400米,从而构成了岩溶地貌景观的“多层性”和“叠加性”。在这个多级型地块上,占全省面积(17.64万平方公里)73％的碳酸盐岩层,所形成的地下河和种类繁多的岩溶形态,主要受控于众所周知的岩性、构造、古水文网和现代水文网。      

桃林闪锌矿的矿物学特征

本文研究了桃林铅锌矿闪锌矿的化学成分、晶胞参数、红外光谱及物理性质《比重、硬度和反射率)等方面的待征。讨论了成分、结构与物理性质之间的关系,并探讨了矿床成因。     

基于孔压静力触探的岩土参数正态性检验方法对比

岩土参数的正态分布是岩土工程可靠分析的基本假定之一。目前,岩土工程参数的正态性检验以KS （Kolmogorov-Smirnov）检验为主,然而诸多研究表明,对于小样本数据,KS检验的正态性检验结果并不可靠。本文以废黄河泛滥沉积相粉土中的孔压静力触探（CPTU）锥尖阻力q_t数据为研究对象,首先采用ANOVA （方差分析）检验,从CPTU测试资料中进行总体的样本筛选,然后应用SW （Shapiro-Wilk）检验、KS检验、LF （Lilliefors）检验和AD （Anderson-Darling）检验等4种正态性检验方法,在不同样本容量条件下,对测试数据进行正态性检验评价。当测试数据的样本容量充足时,分析结果表明：SW检验结果最为严格,KS检验结果最不保守,而LF检验和AD检验的严格性介于两者之间;对于常规岩土工程设计,采用KS检验结果即可满足稳定性分析要求,对于复杂岩土工程设计,采用SW检验对设计参数进行正态性检验,可降低设计的不确定性。     

Corrosion behavior of anodic oxidized TiO<Subscript>2</Subscript> film in seawater

TiO₂ films were formed on metallic titanium substrates by the anodic oxidation method in H₂SO₄ solution under the 80V D.C.. Phase component and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Water contact angles on titanium oxide film surface were measured under both dark and sunlight illumination conditions. Corrosion tests were carried out in seawater under different illumination conditions by electrochemistry impedance spectrum (EIS) and polarization curves. The result showed that the TiO₂ film prepared by the anodic oxidation method was anatase with a uniform structure and without obvious pores or cracks on its surface. The average water contact angle of the film was 116.4° in dark, in contrast to an angle of 42.7° under the UV illumination for 2 hours, which demonstrates good hydrophobic property. The anti-corrosion behavior of the TiO₂ film was declining with the extended immersion time. Under dark conditions, however, the hydrophobic TiO₂ film retarded the water infiltrating into the substrate. The impedance changed slowly and the corrosion current density was 2 orders of magnitude lower than that with the film illuminated by sunlight. All of those mentioned above indicate that the TiO₂ film possesses much better performance under dark condition, and it can be applied as an engineering material under dark seawater environment.     

APPLICATION OF CLAYS TO REMOVAL OF RED TIDE ORGANISMS Ⅰ.COAGULATION OF RED TIDE ORGANISMS WITH CLAYS

Coagulation of red tide organism cells with clays is discussed in theory and the effects of some fac-tors on it are studied.A quantitative model is presented which describes how the coagulation varies withpH in solution.According to the model,within the pH-range between pH_(zpc_a)and pH_(zpc_b),V_R is negativeand the coagulation is strong and strongest at pH=(pH_(zpc_a)+pH_(zpc_b))/2.It is also demonstrated that whenthe diameter of clay particles is close to that of cells,the collision probability is low,resulting in weakercoagulation.The model results have been corroborated by experiments and so are scientific and theoreticalbases for application.