仙王座β型变星ν Eri的测光,分光观测及脉动模式的分析     

卢方军  刘学富 《天文学报》1994,35(3):305-317

本文给出了１９９１年１１月在北京天文台兴隆观测站对仙王座β型变星ν Ｅｒｉ进行的ｂ，ｙ波段光电测光结果，及１９９１年１２月在云南天文台观测获得的高分辨、大色散的ＳｉＩＩＩ线附近区的ＣＣＤ光谱，根据光变的多重周期分析结果，计算和分析了ν Ｅｒｉ的理论脉动模式，并以高分辨的ＳｉＩＩＩ线轮廓为例，分析了该星的谱线轮廓变化并计算了谱线的半宽，等值宽度以及视向速度。  相似文献   

东北印度洋深海记录基本特征及其对青藏高原隆升的响应   总被引：14，自引：2，他引：14       下载免费PDF全文

方念乔  陈学方  胡超涌  丁旋  张振芳  刘勇勤 《第四纪研究》2001,21(6):490-499

本文在综合东北印度洋域5支深海钻芯和7支活塞柱状芯资料的基础上,对该区沉积作用及其形成的记录与北部山脉和高原隆升的关系进行讨论.过去有关深海记录对造山带构造活动响应的研究多集中于孟加拉浊积扇,而90°E海岭的远洋沉积记录通过海气相互作用系统作为中介,可能包含响应隆升的重大环境信号.初步研究表明,远洋记录中的碳酸盐含量、有孔虫的形态结构和若干微量元素特征的剧变期与已知的高原构造阶段存在密切的对应关系,其中,距今8Ma、3.7Ma、0.8Ma和0.16Ma所反映的变化尤为突出.  相似文献   

江苏省粮食作物气候—土壤生产力与人口承载量研究   总被引：6，自引：0，他引：6  

刘乃壮  王生明 《南京气象学院学报》1991,14(2):170-178

本文运用经改进的Kassam-Wageningen法,对江苏省4大粮食作物的光、温、水生产潜力与土壤的影响进行了逐级计算,对全省6个农区粮食生产力的地理分布,未来40年的发展,及其满足人口需求的能力做出分析与预测,提出了今后实现粮食生产与人口消耗良性平衡的策略。  相似文献   

钒钛磁铁矿中钛铁连测方法研究     

凌学芳 《矿物岩石》1990,10(2):105-107

本文采用中性红和二苯胺磺酸钠作指示剂,以重铬酸钾标准溶液对钒钛磁铁矿中钛铁连测.经对介质、指示剂、催化剂加入量等的优选试验和分析结果时照,本方法终点敏锐,操作简便、快速,结果可靠.  相似文献   

南阳独山玉的矿物学研究   总被引：3，自引：0，他引：3  

张建洪  李朝晖  汪雪芳 《岩石矿物学杂志》1989,8(1):53-64

南阳独山玉呈脉状产于河南省南阳市独山透闪石化辉长岩岩体内。笔者选择了各种代 表性样品(白玉、绿玉、白绿玉,棕黑色玉),对其进行了光薄片显微镜观察、探针、电镜、X光、红外等分析以及显微硬度测定。研究表明,独山玉在矿物成分上极为独特,以高钙、高铝、贫硅为特征,如:“纯”钙长石、黝帘石、珍珠云母等。除此之外,尚有一系列含铬矿物,如:铬绿帘石、含铬白云母—珍珠云母,含铬黑云母—金云母、铬蒙脱石、铬铁矿。这表明独山玉是在较特殊的地质环境下形成的,起交代作用的热液成分以钙为主,而铬对独山玉呈绿色、翠绿色有很大关系。  相似文献   

主动脉夹层动脉瘤CT诊断与临床应用     

曹连义  李学芳 《CT理论与应用研究》1996,5(3):5-6

１９８７－１９９６年确诊主动脉夹层脉瘤６例，主要临床表现：恶心，呕吐，急腹症状及有高血压病史。其ＣＴ表现：主动脉内膜瓣片为一薄层而且略弯曲的线样结构。增强后主动脉腔内可见弧形线状低密度影，可显示真和假腔；及钙化的内膜向内移位，腔内栓塞。  相似文献   

地震监测预报中的卫星遥感（热红外）图象处理   总被引：2，自引：0，他引：2  

阎民正  郭跃宏 《山西地震》1996,(3):13-22

叙述了用于地震监测预报中的卫星遥感（热红外）图象处理的原理、方法，分析了图象处理的特征，通过实例对图象处理进行了说明，指出了存在的问题  相似文献   

大同－阳高地震前定襄台的水氡异常特征     

范雪芳 《山西地震》1995,(1)

应用水文地球化学分析预报方法指南，对定襄七岩泉１９８６～１９９１年的水氡观测资料进行了处理分析，结果表明该泉在大同－阳高６．１级地震前有明显的短临前兆异常，同时给出相应的差别指标。  相似文献   

Use of Tunisian raw clay to remove dye from aqueous solution     

Chaâri Islem  Jridi Kamel  Fakhfakh Emna  Jamoussi Fakher  Mnif Adel 《Arabian Journal of Geosciences》2016,9(10):564

This paper presents the first attempt to investigate the potential of Tunisian palygorskite-rich clay (Pal-clay) on the effectiveness of a textile dye “Direct orange 34” (DO34) removal. Important parameters which affect adsorption, such as initial solution pH, contact time, adsorbent mass, initial dye concentration, and temperature, were investigated. The raw Pal-clay was characterized using X-ray diffractometer (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), cation exchange capacity (CEC), specific surface area (SSA) analysis, and point of zero charge (PZC) determination. The results showed that the Pal-clay has a high selectivity for DO34 and had maximum removal efficiency reaching up to about 91 %. The highest adsorption capacity was obtained at 25 °C and pH of 2. The dye uptake process fitted well to the pseudo-second-order kinetic expression and was best described by the Langmuir and Freundlich isotherms. Intra-particle diffusion studies showed that the adsorption mechanism was not exclusively controlled by the diffusion step and was more likely to be governed by external mass transfer. Thermodynamic parameters such as change in free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were also calculated. The parameters revealed that the adsorption of dye by the raw clay is spontaneous and exothermic. The results indicate that the Pal-clay has a moderate adsorption capacity towards anionic dye.  相似文献   

Future changes in drought characteristics over South Korea using multi regional climate models with the standardized precipitation index     

Yeon-Woo Choi  Joong-Bae Ahn  Myoung-Seok Suh  Dong-Hyun Cha  Dong-Kyou Lee  Song-You Hong  Seung-Ki Min  Seong-Chan Park  Hyun-Suk Kang 《Asia-Pacific Journal of Atmospheric Sciences》2016,52(2):209-222

In this study, the projection of future drought conditions is estimated over South Korea based on the latest and most advanced sets of regional climate model simulations under the Representative Concentration Pathway (RCP4.5 and RCP8.5) scenarios, within the context of the national downscaling project of the Republic of Korea. The five Regional Climate Models (RCMs) are used to produce climate-change simulations around the Korean Peninsula and to estimate the uncertainty associated with these simulations. The horizontal resolution of each RCM is 12.5 km and model simulations are available for historical (1981-2010) and future (2021-2100) periods under forcing from the RCP4.5 and RCP8.5 scenarios. To assess the characteristics of drought on multiple time scales in the future, we use Standardized Precipitation Indices for 1-month (SPI- 1), 6-month (SPI-6) and 12-month (SPI-12). The number of drought months in the future is shown to be characterized by strong variability, with both increasing and decreasing trends among the scenarios. In particular, the number of drought months over South Korea is projected to increase (decrease) for the period 2041-2070 in the RCP8.5 (RCP4.5) scenario and increase (decrease) for the period 2071-2100 in the RCP4.5 (RCP8.5) scenario. In addition, the percentage area under any drought condition is overall projected to gradually decrease over South Korea during the entire future period, with the exception of SPI-1 in the RCP4.5 scenario. Particularly, the drought areas for SPI-1 in the RCP4.5 scenario show weakly positive long-term trend. Otherwise, future changes in drought areas for SPI-6 and SPI-12 have a marked downward trend under the two RCP scenarios.  相似文献