巴音戈壁盆地塔木素铀矿床含矿砂岩成岩作用类型、演化序列及其对铀成矿的约束     

张成勇  夏菲  严兆彬  邓薇  聂逢君  张鹏飞  文振宇  刘波  戴明建  封志兵 《地球学报》2021,42(6):907-920

勘查和研究发现部分砂岩型铀矿床中不仅有表生氧化流体作用还存在深部流体的参与,这类砂岩型铀矿床蚀变类型多样且成因复杂.塔木素砂岩型铀矿表生流体和深部流体活动都很明显,砂岩普遍固结且后生蚀变类型独特,因此,恢复成岩成矿事件及其演化过程,对揭示铀沉淀富集机理至关重要.本文通过镜下鉴定、电子探针、扫描电镜分析等,系统研究了塔木素矿床含矿砂岩成岩作用特征与后生蚀变矿物生成序列,重塑了成岩成矿事件的演化过程.研究结果显示,塔木素矿床砂岩中压实作用较弱而胶结作用很强,重结晶作用普遍,是造成目的层致密的主要原因,赤铁矿、褐铁矿化、碳酸盐化、石膏化是该地区主要的胶结类型.将该地区的成岩演化划分为沉积-早成岩阶段、早期氧化流体作用阶段、热流体改造阶段和晚期氧化流体弱改造阶段.成岩环境由弱碱性向酸性环境转变的过程中的氧化还原过渡部位是造成铀沉淀的关键,大规模的氧化作用是矿床形成的基础,后期热流体活动对早期形成的低品位铀矿石进行叠加改造,是成矿的关键环节.  相似文献   

谈Micaps处理机的软件优化     

聂祥  蒙陈  张寿荣 《贵州气象》2006,30(2):42-43

在9210工程系统中,M icaps处理机的正常与否对及时分析气象资料产生直接影响。PCVSAT下发资料信息量的增加使M icaps处理机运行不正常现象时有发生。指出了处理数值预报资料过程对M icaps运行的影响,讨论M icaps软件中对transdat.exe任务进行分解的必要性,提出分解处理任务的方法思路,将datatim e.tab文件分解后开发各自的处理软件,最后对M icaps处理软件进行界面集成。  相似文献   

结合PS特征点的SBAS地表形变监测     

聂运菊  熊佳诚  程朋根  罗跃 《测绘通报》2020,(4):91-95

针对SARscape SBAS技术存在人工选取地面控制点影响监测结果的问题,本文提出了一种结合PS特征点的SBAS地表形变监测方法。通过设置PS技术中的振幅离差指数与相干性阈值,提取PS监测结果中的特征点作为地面控制点进行轨道精炼与形变反演。以2017年3月至2018年12月覆盖南昌地区的Sentinel-1影像为数据源,进行了地表形变监测与验证。结果表明：①该方法与PS方法监测结果均显示南昌市城区在监测时段内整体呈小幅度上升趋势,年平均沉降速率相关性达到了0.959,具有高度一致性。②将该方法、PS方法、人工选取地面控制点的SBAS方法的监测结果与水准数据进行对比,该方法与水准数据的误差不超过3.5 mm,说明了该方法的有效性。  相似文献   

结合IR-MAD与均值漂移算法的密集城区遥感影像变化检测     

聂倩  赵艳福 《测绘通报》2020,(6):57-62

不同时相遥感影像变化检测已成为土地利用变更调查、城市扩张分析、自然灾害分析及其他环境问题必不可少的技术手段之一。本文提出了一种结合IR-MAD与均值漂移算法的密集城区遥感影像变化检测方法。该方法通过伪不变特征法完成两期影像的相对辐射校正,有效改善影像间的配准误差,并利用IR-MAD算法对校正后的影像进行迭代运算,采用均值漂移算法对迭代后的影像进行分割,同时运用形态学方法处理分割后的影像,最终提取变化图斑。试验结果表明,该方法可以有效检测出变化区域,可应用于城市地表覆盖的变化检测。  相似文献   

香鱼(Plecoglossus altivelis)脾脏酪氨酸激酶SYK的鉴定及其介导的MAPK信号通路研究     

孙娇  聂力  苗亮  陈炯 《海洋与湖沼》2020,51(5):1182-1193

脾脏酪氨酸激酶(SYK)是一种非受体型酪氨酸激酶(non-receptor tyrosine kinase, NRTK)。在哺乳动物中,SYK是重要的细胞信号通路接头分子,其在免疫细胞活化,胞外刺激的信号转导和病原体识别等多种生命过程中扮演重要角色,然而在鱼类中却鲜有报道。本研究以香鱼(Plecoglossus altivelis)为研究对象,探讨了其SYK(PaSYK)在应对病原微生物感染及在活化免疫信号通路中的作用。我们克隆获得了香鱼SYK的cDNA序列,并利用多重序列比对、构建进化树等生物信息学方法分析PaSYK的进化地位;采用实时荧光定量PCR(RT-qPCR)方法分析PaSYK在健康组织及鳗弧菌(Vibrio anguillarum)感染后的表达变化;亚细胞定位检测PaSYK在HEK293T细胞的分布情况;在香鱼头肾单核/巨噬细胞(Monocyte/macrophage,MO/MΦ)中过表达PaSYK,研究其对炎症细胞因子表达的调控作用并在HEK293T细胞及香鱼头肾MO/MΦ中研究PaSYK对MAPK信号通路的活化作用。多重序列比对结果显示,SYK的蛋白质序列和结构域在进化过程中是高度保守的。系统进化树结果表明, PaSYK与河鳟的亲缘关系密切。RT-qPCR结果表明, SYK基因mRNA在检测的所有组织中均有表达,鳗弧菌感染后免疫相关组织中PaSYK表达量均上调。此外,PaSYK能显著诱导香鱼头肾MO/MΦ中促炎因子TNF-α和IL-1β的表达,但对抑炎因子TGF-β和IL-10的表达起到略微的抑制作用。Western blot结果证明PaSYK可以激活MAPK信号通路。综上所述, SYK分子在进化上高度保守,香鱼SYK与其哺乳动物中的同源物具有保守的功能,均能活化MAPK信号通路并在炎症反应中发挥作用。  相似文献   

Multi-band Solar Full-disk Extreme Ultraviolet Imager     

PENG Ji-long  FENG Tao-jun  SHI En-tao  LI Lin  YU Qian  ZHANG Kai  NIE Xiang-yu  MA Zi-liang 《Chinese Astronomy and Astrophysics》2019,43(3):444-456

Solar Extreme Ultraviolet (EUV) imaging observation is an important measure for the researches of solar activities and coronal plasma physics. But the traditional EUV imager and spectrograph can hardly achieve simultaneously the high spectral resolution and wide field-of-view of solar imaging. This paper has designed a new type of solar EUV multi-band imager, by adopting a kind of slitless grating and grazing incidence structure, it can realize the solar full-disk imaging of high spectral and spatial resolution. The field-of-view of the imager can be as broad as 47′. The spectral resolution is 2×10^?3nm per pixel, and the spatial resolution is 1.4′ per pixel. The temporal resolution of the solar full-disk is better than 60 s. The analysis of the solar full-disk spectral image and system response shows that the imager can observe the morphological evolutions of various solar activities, and can provide more comprehensive data for the researches of solar physics and space weather forecast.  相似文献   

基于MTFC的图像复原结果对比分析     

聂荣娟  刘丹丹  张晓迪 《北京测绘》2019,33(1):116-119

地物在成像过程中,由于受到光学成像系统作用、地物周边环境等影响,会使得到的地物影像存在噪声、模糊等各种影像质量下降的问题,这种现象就是图像退化。根据影像退化机制,利用调制传递函数补偿(Modulation Transfer Function Compensation,MTFC)原理复原图像,提高航空面阵成像系统的成像质量,使航空面阵影像更便于判读解译。采用调制传递函数补偿(MTFC)原理进行图像复原。复原图像与原始影像相比在一定程度上边缘更加清晰,更利于判读解译,但在复原过程中也不可避免的添加了噪声。通过复原图像评价指标对比发现,利用航线方向MTF得到的复原图像效果较差,这与成像系统航线方向成像性能偏低有关。  相似文献   

Extraction of Lithium from Salt Lake Brine using N523-TBP Mixture System   总被引：1，自引：1，他引：0       下载免费PDF全文

SHI Dong  LI Li-juan  LI Jin-feng  JI Lian-min  SONG Fu-gen  PENG Xiao-wu  ZHANG Li-cheng  ZHANG Yu-ze  LI Hui-fang  SONG Xue-xue  NIE Feng  ZENG Zhong-min  LIU Zhi-qi  GUO Fan 《盐湖研究》2019,27(2):95-110

In this work,problems encountered by tri-butyl phosphate( TBP) in the industrialization of lithium extraction from salt lake brine were discussed in detail. The behavior of N,N-bi-( 2-ethylhexyl) acetamide( N523) during lithium extraction was investigated,and its disadvantages were analyzed in the view of practical application. An N523-TBP mixture extraction system was proposed to alleviate or avoid the defects that N523 and TBP met when they were used separately. The optimal composition of this mixture extraction system was determined to be 20% N523-30% TBP-50% kerosene.The effects of brine acidity,Fe/Li molarity ratio,phase ratio and chloride ion concentration on lithium extraction efficiency were discussed. The operation conditions in single-stage extraction were optimized as brine acidity = 0. 05 mol/L,Fe/Li molarity ratio = 1. 3,and phase ratio = 2. The high concentration of chloride ions in brine was beneficial for the extraction of lithium. The structure of the extracted complex was proposed as( LiFeCl_4·n N523·m TBP)·( 2-n) N523·( 2-m) TBP( m + n = 2) by chemical analysis and slope-fitting methods. The extraction thermodynamic functions were calculated preliminarily,and the results suggested that the extraction process was an exothermic( ΔH 0) and spontaneous( ΔG 0) reaction,and the degree of disorder increased( ΔS 0) during the extraction process. This work will give some guidance to the lithium industry of Qinghai in both the fundamental theory and practical application.  相似文献   

中国半干旱草原施氮梯度下的土壤激发效应（英文）     

李悦  聂成  邵蕊  杜薇  刘颖慧 《资源与生态学报(英文版)》2019,(2):147-154

为了探究施氮对土壤有机质(SOM)的激发效应,本研究在施氮梯度样地(0、4和16 g N m^–2 yr^–1)上进行了¹³C标记葡萄糖的原位添加实验,并对土壤CO_2排放量和磷脂脂肪酸(PLFA)含量进行了测定。研究发现施氮降低了土壤CO_2排放、土壤PLFA含量以及土壤真菌细菌比。在0 g N m^–2 yr^–1样地上葡萄糖添加导致的正向激发效应最强,同时4 g N m^–2 yr^–1样地释放的葡萄糖来源的碳最多。因此,施氮减少了土壤中SOM转化产生的CO_2,微生物碳的来源由SOM转变为添加的易分解碳。本研究采样早期土壤微生物生物量和群落结构稳定,表明该草原存在"表观激发效应",因此未来研究应着重对微生物功能的多样性进行探讨。  相似文献   

Soil Respiration Dynamics and Influencing Factors in Typical Steppe of Inner Mongolia under Long-term Nitrogen Addition     

DU Wei  WU Shanmei  NIE Cheng  LI Yue  SHAO Rui  LIU Yinghui  SUN Nan 《资源与生态学报(英文版)》2019,10(2):155-162

We investigated soil respiration (Rs) dynamics and influencing factors under different nitrogen (N) addition levels (0, 2, 4, 8, 16, 32 g m^-2 yr^-1) on typical grassland plots in Inner Mongolia. We measured soil respiration, temperature, moisture and nutrients. We found that N addition did not change dynamic characteristics of Rs; daily and seasonal dynamics followed a single peak curve. N addition reduced Rs during the growing season. Rs under N2, N4, N8, N16 and N32 treatments decreased by 24.00%, 21.93%, 23.49%, 30.78% and 28.20% in the growing season, respectively, compared to the N0 treatment. However, Rs in the non-growing season was not different across treatments. Rs was significantly positively correlated with soil temperature and moisture and these two factors accounted for 72%-97% and 74%-82% of variation in Rs, respectively. The soil respiration temperature sensitivity (Q₁₀) was between 2.27 and 4.16 and N addition reduced Q₁₀ except in the N8 treatment.  相似文献