计算机互联网上时间传递的一种设计方案

目前,国内外时间传递方式主要有长波授时、短波地、电话授时、双星比对、ＧＰＳ时间信息等。信息产业的不断发展,使得互联网络已成为一种新的信息传递手段和资源共享方式 。通过计算机网络传输标准时间、频率将是授时领域的新课题,也是时间同步的新手段。讨论了计算机互联网上时间传递的一种设计方案,给出利用计算机网络系统实现标准时间的传递的具体方法,并介绍一种计算机互联网时间传递软件的使用方法等。     

Formation of an Interactive User-Oriented Forecasting System: Experience from Hydrological Application in Linyi, Eastern China

Having provided an overview of the ideas of developing user-oriented interactive forecast system (UIFS) emerging in recent years,the authors proposed an idealized framework of the new-generation meteorological system,which includes the initial user-end module for configuring the forecast target,the physical predictive and downscaling components,and an incessant assessing module in association with decision-making at the user-end.A case study was carried out with a focus on applying the TIGGE (THORPEX Interactive Grand Global Ensemble;THORPEX stands for The Observing System Research and Predictability Experiment) precipitation forecasts for the hydrological users in Linyi,a region richest in rivers and reservoirs in eastern China.The preliminary results exhibited great potential of improvement in applications of weather forecasts by combining the user-end information.Although the TIGGE results provided by existing national/international operating models were independent from the user-end,the case study enlightened ways of establishing an iteratively self-improving UIFS involving user-orientation throughout the forecast process.     

湘南地区锡石结晶控制因素——来自阴极发光图像、微量元素和年龄的证据

湘南是南岭有色、稀有多金属成矿带的重要组成部分,发育多种类型锡多金属矿床,目前对于不同类型锡石的流体来源、成分和物理化学条件差异,尚不清楚。选择湘南地区香花岭、芙蓉和红旗岭锡多金属矿床,采集接触矽卡岩型、远端矽卡岩型、云英岩型、绿泥石脉型和石英脉型5种不同类型锡石,开展阴极发光（CL）显微结构、年龄、原位微量元素等研究,探讨不同类型锡石结晶过程控制因素。红旗岭钨锡矿床锡石LA-ICP-MS U-Pb年龄为153.7±2.4 Ma。湘南不同类型锡石CL图像颜色变化主要与Ti和Nb、Ta相对含量有关,含CL激发剂Ti含量高则CL图像颜色浅,含CL抑制剂Nb、Ta高则CL图像颜色较深。不同类型锡石的Zr/Hf值反映了围岩地层的同化混染和流体演化程度。其中矽卡岩型和石英脉型锡石Zr/Hf值高于成矿岩体,受地层的影响较大,云英岩型和绿泥石脉型锡石Zr/Hf值则低于成矿岩体,表明其具有较高的流体演化程度;绿泥石脉型和石英脉型锡石原生与次生结构发育完全相反的Fe、W、U含量及Zr/Hf值变化趋势,可能分别代表了大气水加入和脉冲式岩浆流体。     

锚杆动测问题的数值解

建立了锚杆动测问题的有限元模型，并对锚杆中的缺陷进行了数值模拟，获得了位移场的数值解。对该解在时域和频域范围内的讨论表明，锚杆中的缺陷将引起动测曲线一系列的变化，为现场动测曲线的识别提供了依据。     

移动空间信息服务系统的研究与实现

介绍了移动空间信息服务系统的概念及其体系结构,对其涉及的移动定位、移动通信、嵌入式系统、移动计算等相关技术背景进行了研究和分析.提出了一种具有创新性的移动空间信息服务系统主体设计方案及具体实现策略,并给出了部分实验结果.     

贡嘎山东坡不同海拔高度树轮宽度对气候变化的响应

树木生长对气候变化的响应机制是气候重建的基础,在不同的气候或环境背景下,树轮宽度对气候变化的响应不同,其响应随着地形或海拔等因素的变化而变化。利用采自贡嘎山东坡5个海拔高度的树轮样本建立了树轮宽度年表,并对年表特征、年轮宽度及其对气候要素的响应进行分析,探讨了该区树木径向生长对气候变化的响应关系。结果表明:年轮平均宽度具有随海拔高度的增加而减小的趋势,树轮宽度对气候要素的响应也具有海拔差异。在海拔3700m的森林上限树轮宽度与当年7月份平均温度显著正相关,在海拔3000m高度与3月份平均温度显著正相关,而在海拔2800m树轮宽度与气候因子之间没有显著的响应关系。通过与海螺沟冰川末端进退变化和文献记载的特殊气候年份对比发现,树轮宽度年表与海螺沟冰川进退变化及文献记录的特殊气候年份具有一定的一致性,宽度年表对气候变化具有一定的指示意义。     

辽宁省应急流动测震台网技术系统

本文介绍了辽宁省应急流动测震台网的构成以及供电模式、系统集成、数据传输等内容。     

Feasibility of central loop TEM method for prospecting multilayer water-filled goaf

With deep mining of coal mines, prospecting multilayer water-filled goaf has become a new content that results from geophysical exploration in coalfields. The central loop transient electromagnetic (TEM) method is favorable for prospecting conductive layers because of the coupling relationship between its field structure and formation. However, the shielding effect of conductive overburden would not only require a longer observation time when prospecting the same depth but also weaken the anomalous response of underlying layers. Through direct time domain numerical simulation and horizontal layered earth forward modeling, this paper estimates the length of observation time required to prospect the target, and the distinguishable criterion of multilayer water-filled goaf is presented with observation error according to the effect of noise on observation data. The observed emf curves from Dazigou Coal Mine, Shanxi Province can distinguish multilayer water-filled goaf. In quantitative inversion interpretation of observed curves, using electric logging data as initial parameters restrains the equivalence caused by coal formation thin layers. The deduced three-layer and two-layer water-filled goafs are confirmed by the drilling hole. The result suggests that when observation time is long enough and with the anomalous situation of underlying layers being greater than the observation error, the use of the central loop TEM method to prospect a multilayer water-filled goaf is feasible.     

Metallogenic focus-area and superlarge mineral deposits in the bordering zones between China,Russia and Mongolia

Two deep-sea cores in the northwest Pacific have been analysed for sedimentology, mineralogy and environmental magnetism. The results show that after eliminating the interference from volcanism, several proxies such as quartz content, mass susceptibility and anhysteretic magnetic remanence can be used to indicate the eolian deposit from East Asia, and provide information on paleo-atmospheric circulation. A comparison of eolian record in Cure RC10-175 with its oxygen isotopic curve has revealed that the peaks of eolian accumulation occurred at the climatic “optimum” of the Holocene and the last interglaciation, showing the fairly complex nonlinear relationship between continental/pelagic eolian records and the global glacial cycles as well as within the climatic and environmental system. Project supported by the National Natural Science Foundation of China (Grant No. 9291104)     

川北若尔盖高原表土孢粉的特征及其与现代植被的关系

通过对若尔盖高原不同植被带34个表土样的孢粉分析,研究了各植被带的表土孢粉组合与现代植被的关系。结果显示：表土孢粉组合基本上能够反映出现代植被的整体特征,与现代植被带在空间分布、建群种和优势种属方面基本相同,但不完全等于植被组成,影响其差异的原因可能是人类活动、孢粉保存、孢粉产量、外来孢粉和孢粉鉴定。表土花粉的代表性因种属的不同而各有差异。乔木花粉中,松属具有超代表性,云杉属代表性较好,而桦木属不具有超代表性;草本花粉中,菊科具较好的代表性,蒿属和藜科等具代表性,而禾本科和莎草科具低代表性;蕨类孢子具等代表性。