河北丰宁招兵沟铁磷矿原生矿选磷工艺探讨

河北丰宁招兵沟低品位原生磷矿为嵌布较粗磷灰石类型,对2#和4#矿体中低品位磷的综合回收选矿研究,常温和粗磨条件下均获得较好指标,为工业生产提供了技术依据。     

基于卫星和雷达资料的FAST冰雹云特征分析及识别指标初探

利用风云2号卫星TBB资料、多普勒天气雷达和常规观测资料,分析了近10a影响中国天眼FAST的7次冰雹个例的降雹持续时间、冰雹直径、移动速度等特征,揭示了其源地和移动路径,并初步建立基于卫星和雷达的FAST冰雹识别指标。结果表明：影响FAST冰雹主要发生在春季的傍晚到夜间,冰雹云从初生到降雹平均时间为112 min,平均移动速度为45.5 km/h,降雹持续时间主要为2 min左右,冰雹直径以小于等于10 mm的小冰雹和中冰雹为主;冰雹云源地主要在安顺市,移动路径为西北和偏西路径为主。在降雹前1 h,FAST区域TBB呈西南—东北走向分布,云团中心TBB＜46 ℃,TBB梯度密集的对流区会产生降雹;降雹前30 min识别指标为Z_max≥55 dBz,VIL_max≥30 kg/m²,H_{45 dBz}≥8 km,H_45dBz- H_0℃＞4 km,H_45dBz- H_-20℃＞1 km。     

A Note on the Supersonic Convection in Stellar Atmospheres

By using a non-local convection theory, both the local and nonlocal convective envelope models of evolutionary series of stars with masses from 1 to 30 solar masses are calculated. The problem of supersonic convection is reviewed. The results show that the convective velocities in the stellar atmosphere are seriously overestimated by the local mixing-length theory. Convection is strongly supersonic in the atmospheres of yellow giant and super-giants, while the local mixing-length theory is used. However, it becomes subsonic for most stars when convection returns to the normal nonlocal treatment. Convection velocities increase with increase of luminosities of stars. There is still weak supersonic convection in few red and yellow giant and super-giants. It is suspected whether this supersonic convection in stellar atmospheres is true.     

基于1.2m望远镜自适应光学系统激光信标转盘式机械快门的研究

基于激光信标发射和接收共光路系统中探测器受杂散光影响的关键问题,设计了一种新型转盘式机械快门装置,对光信号进行高频率开关控制,从而对自适应光学系统的波前探测器起到彻底保护作用.设计时,分析了瑞利信标的采样厚度以及快门开关与脉冲激光器的发射、探测器探测时间的时序控制.     

川滇地块地壳运动GPS监测

利用中国地壳运动观测网络1999～2006年的观测数据,计算出川滇地块及其邻区内中国地壳运动观测网络中151个监测站在欧亚参考框架下的水平速度,水平运动速度大小在3.44～19.74 mm/a之间,平均为11.68 mm/a。分析川滇地块及其邻区内测站运动方向的变化得出:川滇地块及其邻区在围绕喜马拉雅东结点作顺时针旋转,川滇地块南北方向上存在明显的挤压,东西方向上存在延伸现象。使用最小二乘法求得川滇地块整体运动速度的大小为13.36 mm/a,运动方向为东偏南64.9°,川西北次级块体的运动速度的大小为15.66mm/a,运动的方向为东偏南52.1°。滇中次级块体的运动速度的大小为12.57 mm/a,运动方向为东偏南72.4°。     

深空探测巡视器视觉导航定位方法研究与地面试验场验证

地外天体表面巡视器就位探测是深空探测研究的重要手段,其自主导航定位能力是任务开展的重要前提。本文主要对视觉导航方法中的视觉同时定位与地图构建(SLAM)方案开展应用研究。介绍了当下经典的视觉SLAM框架,并以具有代表性的ORB-SLAM3算法为例开展研究;分别利用公开数据集、深空探测地面模拟场数据进行试验验证,探索视觉导航定位算法在深空探测场景下的有效性。本文研究为我国后续开展长距离连续巡视任务提供参考。     

从地球测绘到地外天体测绘

随着人类空间探测技术的不断发展,月球与深空探测已成为测绘遥感科学与技术的前沿和新战场。在多类型深空探测任务的驱动下,测绘遥感技术也得到了新的发展。本文结合国内外深空探测的各类任务,对地外天体环绕遥感测图、着陆导航遥感避障、巡视环境感知与视觉导航定位方面的研究现状和成果进行了系统总结;结合未来月球与深空探测任务需求,对深空遥感测绘技术的发展,包括地外天体海量全球遥感数据智能处理、全球控制网精化、月球南极精细三维形貌测绘、多传感器融合的着陆导航避障和巡视环境感知与定位等进行了探讨。     

低应变反射波法在岩溶地区灌注桩检测的初步探讨

根据基桩低应变反射波法的基本原理,结合低应变反射波法在岩溶地区灌注桩检测工程实例,对岩溶地区灌注桩检测的经验进行总结。     

基于科学知识图谱的水文化变迁研究方法探析简

Cultural transformation (including knowledge innovation, ideological emancipation and slogan publicity, etc.) is one of the most important drivers of changes in water management policies. Earlier studies into water culture were mainly based on qualitative methods. However, using only qualitative methods, it is difficult to reveal the stage characteristics of water culture evolution objectively and accurately. Mapping knowledge domains, a rising knowledge discovery method, can holistically reveal the sources of knowledge and the laws of its development. This paper is devoted to exploiting its potential as a quantitative method for researches targeting at water culture evolution. By extracting the key words related to water from People’s Daily, knowledge domains on water culture evolution in China during 1946 2012 are mapped and interpreted, based on which the water culture evolution is unveiled. By comparing the water culture evolution with changes in water policies, stages of water resource development and extreme hydrological events, it is found that there exist clear relationships. This convinces us that mapping knowledge domains could play an effective role in quantitative research on water culture evolution. Further steps towards better quantitative researches on water culture evolution using this method include the enhancement of the universality of newspapers, improvement on the accuracy of key words extraction, and increase in the precision of visualization analysis.     

湘中印支期关帝庙岩体地球化学特征及成因

关帝庙岩体位于湘中盆地,据年龄资料可分为中三叠世末和晚三叠世中期两个形成时期。中三叠世花岗岩中发育闪长质暗色微粒包体,自早至晚依次为细中粒角闪石黑云母花岗闪长岩、细中粒斑状角闪石黑云母二长花岗岩、细-细中粒(斑状)黑云母二长花岗岩。晚三叠世花岗岩自早至晚依次为细中粒-粗中粒斑状二云母二长花岗岩、细粒二云母二长花岗岩。岩石高硅、富铝、高钾,(Na2O+K2O)含量为6.80%~8.87%,平均7.74%;K2O/Na2O比值在1.35~2.66之间,平均为1.58;ASI值为0.99~1.40。总体属镁质、高钾钙碱性系列过铝质花岗岩类。中三叠世花岗岩Ba、Nb、Sr、P、Ti表现为明显亏损,Rb、(Th+U+K)、(La+Ce)、Nd、(Zr+Hf+Sm)、(Y+Yb+Lu)等则相对富集。中、晚三叠世花岗岩ΣREE含量为121.60~197.56μg/g,平均为158.70μg/g;δEu值0.28~0.68,平均为0.53;(La/Yb)N值为5.94~17.53,平均13.80。中三叠世花岗岩ISr值为0.71302~0.71758,εSr(t)值为121~186,εNd(t)值为-9.95~-8.74,t2DM为1.72~1.82Ga。C/MF-A/MF图解显示源岩主要为碎屑岩、少量基性岩和泥质岩。地质地球化学特征表明,印支期关帝庙花岗岩属S型花岗岩,形成于碰撞-后碰撞构造环境。