Velocity curve analysis of the spectroscopic binary stars RZ Cas,CC Cas,HS Her,HD 93917, V921 Her and Y Cygni by the artificial neural networks

We use an Artificial Neural Network (ANN) to derive the orbital parameters ofspectroscopic binary stars. Using measured radial velocity data of six double‐lined spectroscopic binary systems RZ Cas, CC Cas, HS Her, HD 93917, V921 Her and Y Cygni, we find corresponding orbital and spectroscopic elements. Our numerical results are in good agreement with those obtained by others using more traditional methods (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

GPS双频接收机C/A码与P码伪距精度的分析和比较

本文主要研究GPS双频接收机C/A码和P码伪距的精度问题,首先阐述了保密P(Y)码伪距的测量原理,然后采用自行编制的精密单点定位程序,利用大量IGS跟踪站观测数据进行了试算,对该问题进行了探讨和分析,结论认为C/A码和P1码伪距的精度基本相同,而P2码伪距观测值的精度较低。     

厚藤共生真菌(Fusarium oxysporum Y24-2)胞外多糖的化学组成和结构研究

从厚藤共生真菌(Fusarium oxysporum Y24-2)发酵液中提取得到胞外多糖,以Q-Sepharose Fast Flow阴离子交换柱和Superdex S-75凝胶色谱柱对其进行分离纯化,得到纯度高的多糖组分F1S。采用HPGPC和HPLC对F1S的分子量及单糖组成进行分析,结果表明F1S主要由Man、Glc和Gal组成,其摩尔比为1.0∶1.9∶2.1,分子量为37.3kD。F1S的GC-MS和1D,2D-NMR分析表明,该多糖是以→6)-β-Galf(1→为主链,以→2)-α-Glcp(1→,α-Glcp(1→和β-Manp(1→为支链的杂多糖,支链取代于→6)-β-Galf(1→的O-2位。该厚藤共生真菌的胞外多糖为富含呋喃型半乳糖的结构新颖的具有多分支结构的中性杂聚多糖。     

河南省新一代天气雷达业务质量考核管理系统的设计与实施

雷达业务质量的考核对于提升新一代天气雷达的业务运行质量起着重要作用,业务质量的好坏直接影响雷达灾害性天气的监测和预警。根据中国气象局雷达业务质量考核的规定,以C#语言为基础进行开发,采用BS架构,结合SQL数据库设计并实施了河南省新一代天气雷达业务质量考核管理系统,实现了对新一代天气雷达业务运行状况的自动采集和质量的自动化考核。能及时、客观反映雷达业务质量状况,及时发现雷达业务运行中存在的问题,为管理部门解决问题提供依据,以利于雷达的业务管理科学化、自动化、集约化,节约了人力、物力和财力。     

桂西巴马地区极高Ti/Y 值基性岩地球化学特征——来自峨眉山地幔柱高Ti母岩浆？

桂西地区位于扬子地块西南缘,越北地块以北。桂西巴马等地出露层状—似层状基性岩（辉绿岩和玄武岩）,该地区的基性岩成因对于理解该区构造—岩浆作用具有十分重要的意义。对桂西巴马基性岩进行了岩石学和地球化学研究,对其岩石成因和岩浆源区特征进行了讨论。研究表明,桂西巴马基性岩属于碱性玄武质岩,相对富集轻稀土元素和Nb、Ti等微量元素,与峨眉山大火成岩省高Ti玄武岩相似,说明其与峨眉山地幔柱具有相关性。然而,对比峨眉山高Ti玄武岩,巴马基性岩表现出更高的Ti/Y值。不相容元素比值特征表明,桂西巴马基性岩岩浆演化呈现更高的Nb/Y值等演化趋势。结合Dy/Dy?与Dy/Yb、Ti/Y的协变关系,对桂西基性岩与峨眉山玄武岩岩浆源区中稀土元素的分异特征进行判别,揭示出桂西巴马基性岩和峨眉山高Ti玄武岩具有同源性。然而,巴马基性岩地幔熔融程度更低,可能是峨眉山大火成岩省外带的地幔柱岩浆作用延伸的结果,代表了峨眉山地幔柱高Ti玄武岩母岩浆的特征。     

自制氢化物发生系统与电感耦合等离子体发射光谱法联用测定土壤和水系沉积物中的砷锑铋

氢化物发生法-电感耦合等离子体发射光谱(ICP-OES)联用可以提高仪器测定的灵敏度,但氢化物发生的化学反应过程不稳定,导致检测精密度变差。本文设计了一套简易氢化物发生系统,将样品进样管内径由0.32 mm扩大为0.76 mm,与还原剂(硼氢化钾)管路通过三通混合,混合后反应管内径由0.76 mm扩大为1.14 mm,反应管长度由30 cm延长至50 cm,显著增加了待测元素氢化反应的空间和时间,使氢化反应达到平衡态从而提高了氢化物的稳定性。土壤和水系沉积物样品用盐酸-硝酸水浴浸提、硫脲-抗坏血酸预还原后利用此套系统与ICP-OES联用测定了砷锑铋的含量。砷锑铋的检出限分别为0.35μg/g、0.33μg/g、0.25μg/g,测定范围分别为1.1~300μg/g、1.0~100μg/g、0.75~100μg/g,均满足了相关分析要求。     

‘There’s no future here’: The time and place of children’s migration aspirations in Peru

This article examines young Peruvians’ aspirations and the role of migration in their imagined futures, from a generational perspective. The data come from Young Lives, a long-term study of childhood poverty combining survey and qualitative approaches with children and their parents. The paper uses a biographical approach that sees migration as part of individual biographies as well as social structures and life course processes. The aim is to deepen understanding of the social contexts in which aspirations for and by children are generated, paying close attention to family migration histories, dynamic household contexts, and children’s migration networks. The analysis focuses on the time-spaces of migration aspirations, showing the way past, present and future are interconnected. It also emplaces aspirations by focusing on the way aspirations by and for children are constituted in and through particular places. The conclusion reflects on the role of poverty and argues that ‘aspirations’ are about much more than abstract ‘futures’; they orient actions in the present and say a great deal about young people’s current realities and relationships.     

ARE ASTEROID 2003 EH1 AND COMET C/1490 Y1 DYNAMICALLY RELATED?

The orbit of asteroid 2003 EH1 is very similar to the mean orbit of the Quadrantid meteoroid stream so that a close relationship between the two is very likely. It has already been suggested that Comet C/1490 Y1 could be the parent of the Quadrantids. If this is the case, then some relationship between the comet and the asteroid might be expected. The orbit of C/1490 Y1 is based on a short observing arc of about 6 weeks and all the observations were with the naked eye, so that its elements are very poorly determined. Hence, forward integration to determine whether asteroid 2003 EH1 represents the re-discovery of the dormant nucleus of C/1490 Y1 is not feasible. Instead we choose to integrate back in time the orbit of 2003 EH1, which is far better determined, and a family of 3500 clones, all of which are moving on an orbit that is consistent with the present known orbit of 2003EH1. We compare the results primarily with the recorded observations of the comet rather than the orbit of the comet derived by Hasegawa. We find that one clone is consistent with these observations.     

基于活动地块边界带的加卸载响应比参数对海城地震中短期预测的应用

地震构造是强震发生的必要基础，强震的孕育和发生与构造密切相关。强震的孕育和发生不仅与震中周围构造有关，而且与孕震区所在的整个构造带有关。这就表明整个构造带的地震活动性与未来强震都有关联，因此，我们在做测震学参数异常预测地震时，必须考虑整个构造带的地震活动。过去我们常以震中周围地区的地震活动资料来做测震学参数的异常分析，可能会丢失部分信息。本文进行了地震构造分区和构造单元的划分，把加卸载响应比参数和张家口一渤海边界带有机结合，对基于活动地块边界带的加卸载响应比参数在海城地震预测中的应用进行了研究，结果预测效果很好。这种方法对边界带的地震危险性判定有某种参考价值。     

法国阿根特拉花岗岩中锆石的微量元素地球化学特征及地质意义

本文以法国阿根特拉花岗岩中的锆石群为例,系统地阐述了锆石的微量元素地球化学的研究方法及其在花岗岩成因探索中的应用。电子探针分析结果表明,阿根特拉花岗岩中的锆石可以划分为四个相:残留相、析离相、主体相和残余相。它们的微量元素(Hf、U、Y、Th、P)配分一方面表明了各自形成环境的不同,再现了岩浆的产生、定位和结晶等阶段的演化机制;另一方面又反映了该岩体的物质以上地壳的组份为主,含有部分深源物质(上地幔或下地壳)。