稳定层结下近地层垂直风速方差σW／U＊相似性的理论探讨

利用相似性理论，假设在稳定层结下近地层的垂直风速方差σＷ是高度Ｚ的弱函数，推导得到了近地层的σＷ／Ｕ＊与Ｚ／Ｌ的函数关系式。该式可以解释稳定层结下的σＷ／Ｕ＊非常数等事实。     

感热加热对华北及其周边对流活动的影响

利用2006～2017年风云气象卫星资料和气象再分析资料,对华北及周边5～8月对流活动和地面感热加热进行统计分析。分析表明,华北及周边白天平均感热加热和地形关系密切,内蒙古中部和东南部、华北北部和华北西部山区感热加热较强,最强感热加热出现在5月和6月,7月和8月明显减弱。和感热加热强度相对应,对流活动频率较高的月份同样出现在5月和6月,其中5月以弱对流为主,6月华北中北部强对流最活跃,另外,环渤海区域6～7月强对流相对频繁。5～8月日平均感热加热和对流频率趋势呈现一致的减弱对应关系。上午,感热加热引起河北西部和北部对流层低层出现辐合气流,700 hPa以下出现不同程度的增温,上升气流可达对流层中层,东侧的平原地区出现补偿下沉运动,升温和上升运动触发对流,在有利条件下发展东移。不同月份和区域对流频率日变化呈现明显差异,6月对流频率日变化显著,8月最弱,山区对流频率日变化显著,东部渤海及周边对流频率日变化较小。对流频率的月平均分布和日变化均表现出和地形相关的感热加热差异的特征。     

冀鲁豫地区重力场变化与封丘ML4.8地震关系的探讨

利用冀鲁豫测网的流动重力5期观测成果,探讨了重力场变化与封丘地震的关系。研究发现：冀鲁豫交界地区的重力点值在封丘地震前后出现了下降-上升-下降的变化过程,较好地对应了封丘ML4.8地震孕育 发震 震后调整的过程。该重力变化可能是封丘地震的异常反映。     

三角帆蚌对水体悬浮物和叶绿素a消除量的研究

本研究在不同温度条件下分别测定了一龄(△1)和三龄(△3)三角帆蚌对水体中悬浮物和叶绿素a的消除量;研究了三角帆蚌对叶绿素消除效果与水体中藻类生物量之间的关系,并在池塘中挂养1200只三角帆蚌四个月。结果表明:三角帆蚌对水体中悬浮物和叶绿素a的消除率均随水温升高而提高,其中消除效果在总重量相同时△3>△1,较高水温条件下三角帆蚌在悬浮物中优先利用藻类;同一温度下,水体中藻类量增大时,三角帆蚌对叶绿素a的消除量增大而消除率却降低;在池塘挂养测试中与对照池塘比较,四个月后三角帆蚌因大量消除了池塘水中的悬浮物和叶绿素a,使池塘水体透明度提高从26cm提高到了80cm。     

功能CT成像术前评估肺癌生物学行为的研究进展

肺癌是临床常见的恶性肿瘤,有较高的发病率及死亡率.评估肺癌的生物学行为对选择治疗方案、判断疗效及预后具有重要意义,但病理组织标本的获取依赖有创操作且存在诸多问题.目前,应用较先进的功能CT成像技术在术前无创性地评估肺癌的生物学行为已成为当下研究的热点,本文就功能CT成像的一般原理及在评估肺癌生物学行为方面的应用予以综述...     

塔里木盆地北部油气田水文地质及水文地球化学特征

以实测的流体资料为基础，初步揭示了塔北地区油田水文地质和水文地球化学特征。塔北地区存在两股地下水流，南部生油区为压实水流，由南向北流动，北部为重力水流，由北向南流动，这两股水流交汇于雅克拉和轮南地区，向上封闭式内泄。无论重力水流或压实水流，皆为非海相成因、非浓缩成因溶滤水。表明：油气藏的形成绝大部分是寒武－奥陶纪生油层二次成油的结果。     

河南范县M_L4.7级地震的启示

2006年4月9日,在河南省范县(35o40’N,115o24’E)发生ML4.7级地震,地震的宏观震中位于河南省范县的王楼乡、辛庄乡以及濮阳县的濮城镇,震中烈度Ⅴ度。地震的有感范围较大,南起山东省的曹县,北至河北省的大名,西起河南省的濮阳县,东到山东省的郓城县,总面积大约10000余km2。地震虽然没有造成人员伤亡,但是却使许多没有抗震性能的农村房屋和校舍遭到严重破坏,     

陕北南泥湾油田测井方法技术及发展方向

本文着重介绍了陕北南泥湾油田特低渗高阻含油层的测井系列选择及测井解释原则,并利用测井曲线估算储集层参数孔隙度、渗透率、含油饱和度,选择最佳压裂油段,取得了显著的地质效果。文中最后指出陕北石油测井今后应解决的地质问题和测井发展方向——数字测井技术。     

Geology and Genesis of the Mafic—Ultramafic Complexes in the Huangshan—Jingerquan（HJ） Belt,East Xinjiang

More than twenty mafic-ultramafic complexes, which host several mediumor large-sized Cu−Ni deposits, occur along the Huangshan-Jingerquan (HJ) belt in East Xinjiang. Rock types in these complexes are predominated by peridotite, pyroxene peridotite, olivine pyroxenite, gabbronorite, orthopyroxene gabbro, troctolite, gabbro and diorite. The ultramafic rocks are relatively Fe-enriched and are characterized by an assemblage of olivine+orthopyroxene+clinopyroxene+hornblende±plagioclase without obvious metamorphic textures. Chemically, these complexes are relatively Fe-enriched and show a tholeiitic trend of evolution. The complexes in this belt are intruded under the extensional environment in a Mid-Carboniferous back-arc basin. They can be considered as a new type of mafic-ultramafic complexes in orogenic belts, as designated by the name of the East-Xinjiang-type complexes. This project was financially supported by the National Natural Science Foundation of China.     

Scaling and correlation of atmospheric acid deposition evolutions

Detrended fluctuation analysis (DFA) and power spectrum density are applied to verify the presence of temporal scaling behavior and long-range persistence (LRP) of weekly hydrogen ion deposition (WHD), NO₃^- and SO₄^2- deposition series in National Atmospheric Deposition Program, USA, for the period 1978–2001. The results show a common scaling behavior for all sites analyzed. Two distinct scaling regions are identified by DFA1, one corresponding to 1 month to 1 year and the other to 1 year to 5 years. The WHD series obey power-law in two temporal regimes respectively with mean DFA1 scaling exponents α ₁≈0.68 and α ₂≈0.45, implying the presence of LRP in the acid deposition series and there is a tendency for a large deposition event to be followed by another large event, and vice versa. For DFA2–DFA4, however, the annual crossover, which divides the temporal scale into two regimes, disappears gradually with the order q of DFAq increasing, and the two scaling regimes turn to share the same scaling exponent close to α ₁. The result indicates that the scaling behavior exits in the two regimes with the same scaling exponent α ₁, and LRP prevails during the examined 1-month to 5-years scale. NO₃^- and SO₄^2- deposition evolve the same way as WHD does, implying the pollutants involving in acid deposition may share some prominent mechanism controlling their evolutions. We ascribe the long-range power-law scaling of acid deposition evolutions to the self-organized critical behavior of atmosphere under pollution stress and it should be considered in the trend prediction of acid deposition as an important factor.