辽东二户来地区滑石矿成矿因素分析

通过对辽东二户来地区已发现矿床中各代表性钻孔资料进行连井对比分析,总结出该地区滑石矿成矿因素主要有3个方面：1）成矿母岩为古元古界大石桥组（Pt1d）白云石大理岩和含硅白云质大理岩;2）成矿热液来自燕山期侵入的硅酸盐热液;3）控制矿体形态、产状和空间分布特征的主导因素为受区域东西向构造影响而产生的层间裂隙、断裂破碎带.并根据对其成矿特征的研究,预测找矿远景靶区.     

DMS and SO2 at Baring Head, New Zealand: Implications for the Yield of SO2 from DMS

Atmospheric dimethyl sulfide (DMS) and sulfur dioxide (SO₂) concentrations were measured at Baring Head, New Zealandduring February and March 2000. Anti-correlated DMS and SO₂ diurnalcycles, consistent with the photochemical production of SO₂ from DMS, were observed in clean southerly air off the ocean. The data is used to infer a yield of SO₂ from DMS oxidation. The estimated yields are highly dependent on assumptions about the DMS oxidation rate. Fitting the measured data in a photochemical box model using model-generated OH levels and the Hynes et al. (1986) DMS + OH rate constant suggests that theSO₂ yield is 50–100%, similar to current estimates for the tropical Pacific.However, the observed amplitude of the DMS diurnal cycle suggests that the oxidation rate is higher than that used by the model, and therefore, that theSO₂ yield is lower in the range of 20–40%.     

Temporal evolution of the focal mechanism consistency of the 2021 Yangbi MS 6.4 earthquake sequence in Yunnan

Using the Cut And Paste (CAP) method, we invert the focal mechanism of 38 moderate earthquakes (M_S ≥ 3.0) recorded by Yunnan seismic network and analyze the corresponding focal mechanism consistency based on the minimum spatial rotation angle. Our results indicate that the M_S 6.4 mainshock is induced by a lateral strike slip fault (with a rake angle of ～ ?165°) and a little normal-faulting component event along a nearly vertical plane (dipping angle～ 79° and strike ～138°). Combining our results with high resolution catalog, we argue that the seismogenic fault of this earthquake sequence is a secondary fault western to the major Weixi-Qiaohou-Weishan fault. The focal mechanism evolution can be divided into three periods. During the first period, the foreshock sequence, the focal mechanism consistency is the highest (KA<36°); during the second period which is shortly after the mainshock, the focal mechanism shows strong variation with KA ranging from 8° to 110°; during the third period, the seismicity becomes weak and the focal mechanism of the earthquakes becomes more consistent than the second period (18°<KA<73°). We suggest that the KA, to some extent, represents the coherence between local tectonic stress regime and the stress state of each individual earthquake. Furthermore, high focal mechanism consistency and high linearity of seismic distribution may serve as indicators for the identification of foreshock sequence.     

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扩频微波网桥在新疆测震网络中的应用

以频率为2.4 GHz和5.8 GHz设备为例,对扩频微波网桥在新疆测震网络中的应用范围进行阐述;根据实际工作中无线网桥的安装架设经验,对在不同条件、不同环境下可能出现的问题提出相应解决方案.     

LiBr溶液从低浓度到高浓度的分子动力学模拟

在 L i Br与水的物质量比分别为 1∶ 64、1∶ 32、1∶ 16、1∶ 8、1∶ 4和 1∶ 3的情况下 ,对 L i Br溶液从低温到高温的分子动力学模拟进行了研究。随浓度增加 ,锂离子的水合数量呈减少趋势但同时又从 L i+- Br-接触离子对的数量增加中得到补偿 ,而 L i离子的第一配位壳层的配位数量保持不变。在高浓度 Li Br溶液中 ,Br- O之间的距离有所增加 ,Br-- O的径向分布的形状更趋于非对称 ,从而很好地确定了 Br离子水合壳层 L i+- Br-接触离子对可以在更稀的溶液中产生 ,但随浓度增加而增加。L i+- Br-距离明显短于溶液中 Li离子与 Br离子的离子半径之和 ,也短于 L i Br晶体中两者离子半径之和。高浓度溶液中水分子的结构几乎被破坏 ,水分子间的氢键明显增加 ,但没有消失。对 L i+、Br-和水的扩数系数计算值与实验值进行了比较     

一类带阻尼项Duffing型方程周期解的存在性

考虑带有阻尼项的Duffing型方程的边值问题,在Banach空间上运用Leray-Schauder度理论证明其周期解的存在性。     

The effect of gas-phase chemistry on aqueous-phase sulfur dioxide oxidation rates

The rates and mechanisms of both gas and liquid phase reactions for the oxidation of sulfur dioxide play an important role in the production of atmospheric acids and aerosol particles. Rhodeet al. (1981) concluded that sulfate production rates were highly non-linear functions of sulfur dioxide emission rates. Their modelling study used an HO _x termination mechanism for the HO—SO₂ reaction in the gas-phase. Stockwell and Calvert (1983) determined that one of the products of the overall reaction of HO with sulfur dioxide was an HO₂ radical. The National Research Council (1983) using a version of the Rhodeet al. (1981) model modified to include HO₂ production from the HO—SO₂ reaction concluded that sulfate production becomes much more linear with respect to reductions in sulfur dioxide emissions. However, the cause of this increased linearity was not explained by the National Research Council report. It is demonstrated that the increased linearity is due to the coupling of gas-phases and aqueous phase chemistry. The gas-phase sulfur dioxide oxidation mechanism has a very significant effect on hydrogen perodide production rates.     

STUDY ON BIOLOGICAL ACTIVITY OF SELENIUM-ENRICHED MUSSEL EXTRACT

ThisworksupportedbytheScienceandTechnologyCommitteeofShandongProvince.Grant(95)50.INTRODUCTIONManyinvestigationsindicatalthatsupplementation0fsuitableseleniumleveIstolowordefidentinseleniumdietcanpreventoccurrenceofvarioustumots(Chen,l990),enhanceorganisminimneability(Wu,l992),maintainthenormalfunCtion0fheart,liv-er,lungandstomach(Schwarzetal,l957),andisgoodpareuti0nsagainstcardiovascularandcerebrovascu1arproblemsinoldpeople.Seleniumisanessentialtraeeelernentfornonnalhumanlife(Balassa…     

水汽方程古典解的适定性研究

对于球坐标系下的水汽方程,当考虑水汽的凝结或凝华过程时,利用水汽方程的特点得到了关于水汽方程的弱极值原理的较强形式。利用该弱极大值原理,证明了对于第一类、第二类和第三类边值问题,水汽方程解的唯一性和稳定性。利用Schauder方法,证明了对于第一类、第二类和第三类边值问题,C2空间连续的水汽方程解的存在性。此外,还严格证明了水汽方程古典解的非负性。