湖北省罗田县陈林沟金矿床地质特征及矿床成因

陈林沟金矿床矿体呈脉状赋存于近EW向断裂构造中,矿石类型以石英脉型矿石为主,蚀变岩型矿石为次;矿化从浅部向深部出现由金矿化向金银多金属矿化转变,矿体规模逐渐变大,矿化强度逐渐变强;成矿年龄约为130 Ma±,其形成与燕山期岩浆作用具有时空和成因联系,矿床成因类型为中低温岩浆热液型金矿床。     

基于数据挖掘和网络药理学探讨中药治疗化疗相关性恶心呕吐的用药规律和机制

目的：分析和挖掘中医药治疗化疗相关性恶心呕吐（CINV）的用药特点、潜在关联规则及配伍规律,并借助网络药理学和分子对接技术探讨高频药物干预CINV的作用机制。方法：收集中国知网（CNKI）、万方数据（WANFANG DATA）、维普中文科技期刊数据库（VIP）中2000年1月1日至2020年12月31日发表的中医药治疗CINV的随机对照文献,采用统计描述、关联规则、聚类分析等方法探讨中药治疗CINV的用药规律。利用 TCMSP数据库收集相关活性成分,进行靶点预测,利用DAVID数据库进行京都基因与基因组百科全书（KEGG）通路富集分析,使用分子对接技术对核心化学成分与关键靶点进行分子对接验证。结果：共纳入符合要求的文献101篇,涉及中药141味;高频核心药物主要有甘草、半夏、茯苓、白术和陈皮,中药功效以补虚和化痰为主;关联组合提升度较高者为“半夏-大枣-甘草→生姜”等;共筛选得到核心药物活性成分131个,作用靶点151个,认为高频核心药物可能通过神经活性配体-受体相互作用、钙信号通路和5-羟色胺能突触等作用机制对CINV发挥作用。结论：中医药治疗CINV以健脾化痰止呕为法,多采用补虚药、化痰药、理气药,其中甘草、半夏、茯苓、白术、陈皮为高频核心药物,网络药理学和分子对接结果进一步验证了高频核心药物治疗CINV的微观作用机制。     

5 ka BP以来阿尔金山北缘冲洪积扇沉积环境变化和戈壁动力过程初步研究

中国西北干旱区有大面积的戈壁地貌,但对其形成过程的研究不多。阿尔金山北缘的沉积物记录着临近戈壁地貌的发育过程。选择甘肃敦煌南湖绿洲附近的山水沟剖面作为研究对象,在独立的光释光测年基础上,通过对比分析粒度特征、磁化率和有机碳同位素值变化,探讨5 ka BP以来阿尔金山北缘戈壁沉积动力过程及其环境控制因素。结果表明：戈壁发育进程具有波动性,戈壁沉积动力在百（千）年时间尺度上受到环境因素制约,在2.67～3.57 ka BP和1.65～1.95 ka BP干热气候条件下,沉积物搬运动力较弱,戈壁发育受限;在4.27～4.84 ka BP时期水量较大,戈壁发育范围较广,属于扩张阶段。这一结果初步揭示了戈壁地貌演化与气候环境变化的联系。     

Review of research on sonar imaging technology in China

Over the past 20 years, sonar imaging technology particularly for the high-technology sector has been a focus of research, in which many developed countries, especially those with coast lines, have been competing with each other. It has seen a rapid development with increasing widespread applications that has played an important and irreplaceable role in underwater exploration with great prospects for social, economic, scientific, and military benefits. The fundamental techniques underlying sonar imaging, including multi-beamforming, synthetic-aperture and inverse synthetic-aperture sonar, acoustic lensing, and acoustical holography, are described in this paper. This is followed by a comprehensive and systematic review on the advantages and disadvantages of these imaging techniques, applicability conditions, development trends, new ideas, new methods, and improvements in old methods over recent years with an emphasis on the situation in China, along with a bold and constructive prediction to some development characteristics of sonar imaging technology in the near future in China. The perspectives presented in this paper are offered with the idea of providing some degree of guidance and promotion of research on sonar imaging technology.     

福建李坊重晶石矿床形成环境及矿床成因

为了解福建李坊重晶石矿床成因和成矿物质来源,对重晶石单矿物的主量元素、稀土元素、微量元素和硫同位素进行了研究,研究结果显示:重晶石单矿物表现出富Al、Si、Fe的特征;ΣREE总量较低,富集轻稀土元素;δEu呈正异常,δCe呈负异常;微量元素富集Ba、Rb、Nb、Th、P等元素,亏损K、Zr等元素;各个中段δ34S均值大于32.6‰,且直方图中只显示一个主峰。重晶石单矿物成因判别图解、ΣREE-La/Yb图解,分别指示了重晶石单矿物形成于热水沉积区,成矿物质来源于沉积岩区;Si O2/Al2O3、MnO/TFe2O3、U/Th等比值指示了弱碱性—碱性的氧化环境;(La/Ce)N、Al/(Al+Fe)等比值指示大陆边缘环境。研究表明,李坊重晶石矿床形成于大陆边缘构造环境的热水沉积成矿作用,其Ba主要来源于沉积岩区,S主要来源于寒武纪海水,并且有较多陆源物质的输入。     

Strength degradation and anchoring behavior of rock mass in the fault fracture zone

Rock mass in the fault fracture zone has some characteristics such as low strength and poor self-stability, so the control mechanism of stability has been a difficulty in the research of underground engineering. A set of laboratory simulation method of fault fractured rock mass is developed to reflect the natural forming process of fault fracture zone. Compared with intact rock mass, the fault fractured rock mass has an obvious degradation in strength and deformation parameters, and the degradation index is between 22.79 and 84.06%. The bolt has a certain supporting effect on the fault fractured rock mass, and in the situation of end anchoring, the greater the pretightening force is, the better the enforcement effect will be. The stress field produced by high pretightening force can relieve the stress concentration around the bolt hole and make the initial cracks of rock mass away from the bolt plate. The evolution curve of bolt axial force in the process of uniaxial compression of large-scale specimen shows four stages, which are the initial compression stage, pre-peak joint load-bearing stage, post-peak joint load-bearing stage and the residual stage. Research results could provide some theory reference for the stability control of rock mass in the fault fracture zone.     

桥梁变形监测数据小波去噪与Kalman滤波研究

针对跨海大桥三维变形监测问题,实施了测量机器人与三维激光扫描仪测量方案,二者三维监测数据最大较差不超过0.5 mm,而且测量机器人监测数据精度高,说明三维激光扫描技术应用于桥梁变形监测是可行的。根据小波分析与Kalman滤波理论,建立小波去噪后的桥梁变形监测Kalman滤波模型。实验表明,经过小波去噪的监测数据再进行Kalman滤波处理,提高了桥梁变形预测与变形分析的可靠性。通过标准Kalman滤波、自适应Kalman滤波桥梁变形观测数据处理,及平方和误差、均方误差、平均相对误差精度分析知,自适应Kalman滤波要优于标准Kalman滤波方法。     

基于Web Services的海洋表面温度场数据应用服务框架与实现

分析了海洋表面温度场数据应用研究现状,结合Web服务技术,提出了海洋表面温度场数据应用服务框架,把海温数据及应用模型均封装成Web服务,从而提高了分布式环境下,数据的互操作性、应用的可移植性及透明性.基于该框架,开发设计了"中国南海海温数据应用服务平台",该平台可以集成异构、分布式环境中的数据服务和应用服务,从而为用户提供透明的、"一站式"的海温数据Web应用,可为其它海洋信息的集成与应用提供借鉴.     

Revealing ecosystem services relationships and their driving factors for five basins of Beijing

A clear understanding of the relationships among multiple ecosystem services(ESs) is the foundation for sustainable urban ecosystem management. Quantitatively identifying the factors that influence ES trade-offs and synergies can contribute to deepening ES research, from knowledge building to decision making. This study simulated soil conservation, water yield and carbon sequestration in Beijing, China, from 2015–2018. The spatial trade-offs and synergies of these three ESs within the five major river basins in Beijing were explored using geographically weighted regression. Furthermore, geographical detector was applied to quantitatively identify the driving mechanism of the environmental factors for the ES trade-offs and synergies. The results show the following:(1) the spatial relationships between soil conservation and water yield, as well as between water yield and carbon sequestration, were mainly trade-offs. There was a spatial synergy between soil conservation and carbon sequestration.(2) Regarding the spatial trade-off/synergy between soil conservation and water yield in Beijing, the dominant influencing factor was temperature/elevation, and the dominant interactions of the spatial trade-off and synergy between these two ESs in Beijing and the Chaobai River Basin are all manifested in the superposition of precipitation and potential evapotranspiration, temperature, and elevation.(3) Topographic factors were the dominant factors influencing the spatial relationship between soil conservation and carbon sequestration in Beijing and its five major river basins. As a result of the distribution of water systems and hydrological characteristics of the basins, differences were observed in the effects of different combinations of interaction factors on the spatial relationship between these two ESs in different basins.(4) Temperature had the strongest explanatory power in terms of the spatial trade-offs and synergies between water yield and carbon sequestration. The interactions between precipitation and temperature and between precipitation and elevation were the dominant interactions affecting the spatial relationship between water yield and carbon sequestration in Beijing. Overall, the explanatory power of influencing factors on the trade-offs and synergies and the degree of interaction between factors coexist in different basins with consistency and differences. Therefore, understanding the quantitative characteristics of basin-scale spatial trade-offs and synergies between ESs is important for ecosystem management and the promotion of synergy in different basins.     

工业近景摄影测量编码标志改进与识别算法研究

为了提高大尺寸工业摄影测量中编码标志点编码容量和解码准确率,本文设计了一种新的用于数字工业摄影测量的编码标志,该标志结合了环形编码标志和圆点编码标志的特点,编码容量可以达到131072.在简单和复杂的场景中,从不同的拍摄角度进行了实验,实验结果表明,该编码标记易于提取和识别,编码容量大,定位精度高,可以用于大尺寸工业摄...