南极格罗夫山陨石的岩石-矿物学特征及初步分类

我国第16次南极科考队在格罗夫山的蓝色冰表面回收到28块陨石,本文通过详细的显微镜观测和矿物成分的电子探针定量分析,确定28块陨石中的26块为普通球粒陨石,2块为无球粒陨石。在26块球粒陨石中高铁群(H)有11块,低铁群(L)有10块,低铁低金属群(LL)5块。其中H3 5块、H4 2块、H51块和H6 3块;L3 1块、L4 2块、L5 2块、L6 5块。LL4 1块、LL53块、LL6 1块。两块无球粒陨石GRV 99027和GRV 99018具有较高的研究价值,初步确定GRV 99027为二辉橄榄质火星陨石,GRV 99018为钙长辉长无球粒陨石。     

溃坝风险后果研究现状与发展趋势

溃坝风险后果分析是水库大坝风险评估的重要内容。影响溃坝风险后果的因素多,作用机理复杂,导致不同研究方法的分析结果与实际后果之间均存在较大差异。从风险后果的内涵出发,建议风险后果可分为生命损失、经济损失和环境影响3个基础类别;分析国外研究成果与应用情况,明确从基于历史资料构建经验模型到基于致灾机理构建物理模型的发展趋势;分析中国溃坝风险后果评估现状,明确结合致灾机理的经验模型分析、半定量评价和区域损失叠加计算三类研究方法在准确性和实用性方面的优点与不足;提出应从加强致灾机理分析、注重准确性与实用性的结合、重视非工程措施的重要作用和在应用中不断改进等4个方面采取措施,提高风险后果研究水平和实际应用效果。     

从卫星观测数据提取地震前兆信息的震例研究

如何从卫星观测数据中提取地震前兆信息,是近年来一个跨空间物理学、地震学和板块构造学等学科领域的研究焦点.本文回顾和分析了近年来国外学者在震例研究方面的成果,并提出了进行震例研究的思路和步骤.     

丹霞山国家重点保护野生植物丹霞梧桐生态保护红线研究

通过实地考察获取丹霞山核心区丹霞梧桐（Firmiana danxiaensis）数量及其空间分布的经纬度数据,利用ArcGIS10.5的空间分析模块,在分辨率为1 m的DEM数据上叠加,分析丹霞山丹霞梧桐空间分布的坡度、坡向的微地貌环境特征。实地调查表明（2017年12月底）,在丹霞山已开发核心区丹霞梧桐数量不足千株,它们主要分布在海拔100~300 m、坡度大于30°的北西坡和南东坡、有垂直节理或水平层理发育、土壤相对比较贫瘠的崖壁地带。建议在目前丹霞山核心区已发现的怪面石、金龟朝圣、龙角山、锦石岩、双喜台、龙王泉-韶音亭6处丹霞梧桐分布集中的地带,划定丹霞山丹霞梧桐生态保护红线,以便进行重点监测、保护和研究。     

Entanglement of two atoms interacting with a dissipative coherent cavity field without rotating wave approximation

Considering two identical two-level atoms interacting with a single-model dissipative coherent cavity field without rotating wave approximation, we explore the entanglement dynamics of the two atoms prepared in different states using concurrence. Interestingly, our results show that the entanglement between the two atoms that initially disentangled will come up to a large constant rapidly, and then keeps steady in the following time or always has its maximum when prepared in some special Bell states. The model considered in this study is a good candidate for quantum information processing especially for quantum computation as steady high-degree atomic entanglement resource obtained in dissipative cavity.     

Seasonal variations of several main water masses in the southern Yellow Sea and East China Sea in 2011

The seasonal variations of several main water masses in the southern Yellow Sea (SYS) and East China Sea (ECS) in 2011 were analyzed using the in-situ data collected on four cruises. There was something special in the observations for the Yellow Sea Warm Current (YSWC), the Yellow Sea Cold Water Mass (YSCWM) and the Changjiang Diluted Water (CDW) during that year. The YSWC was confirmed to be a seasonal current and its source was closely associated with the Kuroshio onshore intrusion and the northerly wind. It was also found that the YSCWM in the summer of 2011 occupied a more extensive area in comparison with the climatologically-mean case due to the abnormally powerful wind prevailing in the winter of 2010 and decaying gradually thereafter. Resulting from the reduced Changjiang River discharge, the CDW spreading toward the Cheju Island in the summer of 2011 was weaker than the long-term mean and was confined to flow southward in the other seasons. The other water masses seemed normal without noticeable anomalies in 2011. The Yellow Sea Coastal Current (YSCC) water, driven by the northerly wind, flowed southeastward as a whole except for its northeastward surface layer in summer. The Taiwan Warm Current (TWC) was the strongest in summer and the weakest in winter in its northward movement. The Kuroshio water with an enhanced onshore intrusion in autumn was stable in hydrographic features apart from the seasonal variation of its surface layer.     

二维界面流的稳定性及相路方程的椭圆型条件

针对天气实践的一些问题,本文改变了文献[1]的某些作法,分别就上、下行波的稳定性情况,切变邻近区域相路方程的类型条件作了较细致的讨论。结果表明:不稳定极易发生在背急流方向而立的左侧,并在不连续界面的两侧其稳定性是不同的,其相路方程也是有条件的——急流轴及其左侧邻近地区,一般满足椭圆型条件,而其右侧则有可能出现双曲型,从而揭示了扰动沿东西向传播时不稳定易于维持的原因,并与天气实践吻合。     

黑龙江林口西北楞石墨矿地质特征及成矿规律

黑龙江林口西北楞石墨矿位于佳木斯—兴凯(地块)Fe-Au-P-石墨-矽线石成矿带（Ⅲ-53）中部,为一沉积变质超大型晶质石墨矿床。赋矿层位为上元古界兴东岩群大盘道岩组下段(Pt3dp1.),构造较为简单,矿带延展长度约为9.5 km,共圈定石墨矿带6条、石墨矿体73条。矿床地质特征及地球物理特征明显,极具代表性,总结研究其地质特征及成矿规律,对黑龙江东部佳木斯隆起兴东岩群大盘道岩组的区域矿产勘查工作具有一定的参考价值。