“泗滨砭石”地质特征及成因分析

泗水县南部发现了历史上记载的古代名石"泗滨砭石",在泗水县迅速兴起了砭石研究、开发和加工热。该区通过地质测量、放射性测量、地表工程和各类样品的分析测试,大致对泗水县南部地质特征和砭石特征进行了调查了解。"泗滨砭石"产于泗水县南部的低山丘陵区,矿体赋存于寒武纪馒头组石店段地层中,呈层状产出,地表分布3个矿带,10个矿体,矿层产状同围岩产状一致,走向NW,倾向NE,倾角8°~27°,矿层厚度0.5~1.8m,厚度稳定。向NE矿层隐伏于地下,埋深逐渐加大。岩性为紫红色、黄褐色纹层状微晶灰岩,主要矿物成分为方解石,另有少量的泥质、氧化铁质、有机质、石英等。矿床成因为沉积变质型。该文旨在通过对泗水县砭石的成矿地质特征和矿体特征进行分析研究,探讨其控矿作用,总结其成矿规律,以期对泗水县南部砭石的找矿有所启示。     

Observation and simulation of 2-methylisoborneol in the Qingcaosha Reservoir,Changjiang estuary

Journal of Oceanology and Limnology - 2-Methylisoborneol (2-MIB) is a cyanobacterial metabolite that is responsible for many taste and odor (T&O) complaints related to the aesthetics of...     

基于出租车GPS数据的居民就医时空特征分析

城市医疗服务在很大程度上影响着城市居民的生活质量,在公共服务领域中发挥着极其重要的作用。近年来,中国城市化发展过程中产生了海量的大数据,基于这些海量数据分析居民就医出行特征对于优化和改善城市医疗资源布局具有重要意义。本文以北京市主要医疗机构空间位置数据为基础,基于出租车GPS移动轨迹数据,采用时空统计分析方法,研究了出租车出行模式下的居民就医出行时空特征。结果表明,利用医院的OD（Origin-Destination）网络结构特征分析,可以识别出不同医院的服务范围以及受众的时空分布模式。市区尤其是四环以内医院的就医网络密集、紧凑,就医密度较高,而四环以外尤其是郊区周边,就医网络稀疏、分散,医疗资源的级别及地理位置影响了居民的就医倾向。本研究基于浮动车GPS数据开展居民就医时空行为模式挖掘研究,可以为城市医疗资源供需分析和优化配置提供决策支持。     

龙门山前山断裂南段强震崩塌与1327年天全地震

具有强震孕育能力的龙门山前山断裂南段附近地区的强震事件仅有以史料记载的1327年天全地震和仪器记载的1970年大邑6.2级、2013年芦山7.0级地震,这些地震均引发大量的崩塌、滑坡。调查对比发现,沿龙门山断裂南段大川-双石断裂沿线的典型地段分布的历史地震崩塌范围和运移距离都大于芦山地震所触发的崩塌,崩塌的方量和粒径表现为南西往北东逐步减少、减小的趋势。崩塌调查、崩塌体埋藏物和表生地衣相对年代学测试结果、史料记载与震例对比和地震有感半径与震级经验公式计算综合表明,1327年天全地震引起的地面震动大于芦山地震,是天全县“大岩崩”地名和双石镇“晒经书”景观形成的主要原因,1327年天全地震的震中可能位于龙门山断裂南段大川-双石断裂附近的天全响水溪一带,震中烈度≥Ⅸ度,震级≥7.0。     

Analysis of DNA Methylation of Gracilariopsis lemaneiformis Under Temperature Stress Using the Methylation Sensitive Amplification Polymorphism(MSAP) Technique

Gracilariopsis lemaneiformis is an economically important agarophyte, which contains high quality gel and shows a high growth rate. Wild population of G. lemaneiformis displayed resident divergence, though with a low genetic diversity as was revealed by amplified fragment length polymorphism(AFLP) and simple sequence repeat(SSR) analyses. In addition, different strains of G. lemaneiformis are diverse in morphology. The highly inconsistence between genetic background and physiological characteristics recommends strongly to the regulation at epigenetic level. In this study, the DNA methylation change in G. lemaneiformis among different generation branches and under different temperature stresses was assessed using methylation sensitive amplified polymorphism(MSAP) technique. It was shown that DNA methylation level among different generation branches was diverse. The full and total methylated DNA level was the lowest in the second generation branch and the highest in the third generation. The total methylation level was 61.11%, 60.88% and 64.12% at 15℃, 22℃ and 26℃, respectively. Compared with the control group(22℃), the fully methylated and totally methylated ratios were increased in both experiment groups(15℃ and 26℃). All of the cytosine methylation/demethylation transform(CMDT) was further analyzed. High temperature treatment could induce more CMDT than low temperature treatment did.     

大范围GPS水准的综合模型解法

函数模型逼近和统计模型逼近是GPS水准拟合中常用的方法,前者对趋势性和规律性变化参数求解较为理想,后者对随机变化的逼近较为合适。对大范围的GPS水准拟合,综合模型法兼顾二者优点,将获得更高精度,给出了具体模型和计算方法,并对一个大测区的GPS水准数据进行解算,获得了满意的结果。     

A photogrammetric application in virtual sport training

The paper discusses an application of close range photogrammetry for the development of a virtual training system for rugby football, and the use of the technique for the evaluation of rugby players' performance. NuView, a stereo-imaging device, and a digital high-definition video (HDV) camera were used to capture stereoscopic video footage of players during field training. The left view and the right view were colour-tinted cyan and red, respectively. The tinted stereo (anaglyph) views were projected onto a white screen, and players were instructed to practise ball-throwing at the screen. A custom-built laser device (TAM) measured the accuracy of the virtual throws. In addition, a photogrammetric system was used to track the movement of body segments, for example, the angle of shoulder orientation and the trunk flexion of the thrower. The measurements determined the parameters needed for an accurate throw and these parameters would be used in the training of new players. The study shows statistically significant differences in the values of these parameters between experienced and inexperienced players.     

四川汶川地震灾区应急测绘基准精度检测

本文详细介绍了四川汶川地震灾区应急测绘基准精度检测的内容、方法、结果分析等,尤其是在灾区等特殊地域没有已知点可利用的情况下,精度检测采取的具体措施。     

拉萨河谷爬坡沙丘沉积物特征

分析了青藏高原拉萨河谷爬坡沙丘表层及不同深度沉积物的粒度和地球化学元素特征。结果表明：(1)爬坡沙丘表层沉积物以细沙为主,平均粒径为2.51Φ(细沙),分选中等,粒度分布曲线为正偏、窄峰。随海拔升高,表层沉积物逐渐变细;随深度增加,沉积物粒径逐渐变细。(2)爬坡沙丘沉积物常量元素中SiO₂含量最高,微量元素中Ba含量最高。常量元素含量多随深度增加而减少,且在0—10 cm深度内变化幅度最大。与上部陆壳平均化学组成相比,除Na₂O、MnO、Cr、Co、Mo、SiO₂外,其余元素均处于亏损状态。拉萨河谷爬坡沙丘经历了中等的化学风化,处于大陆风化的早期阶段。     

Distribution of Changjiang Diluted Water detected by satellite chlorophyll-a and its interannual variation during 1998–2007

Sea-viewing Wide Field-of-view Sensor (SeaWiFS) chlorophyll-a distribution in summer in the East China Sea during 1998–2007 was analyzed. Statistical analysis with K-means clustering technique allowed us to define the proper satellite chlorophyll-a concentration indicating the Changjiang Diluted Water (CDW). The spatial distributions of the higher satellite chlorophyll-a concentrations (>0.48 mg m⁻³) corresponded well with the distributions of lower salinity CDW (<30–32) every year. Interannual variation of the CDW area, indicated by the high satellite chlorophyll-a, correlated with the interannual variation of the Changjiang summer freshwater discharge. The correlation analysis indicated that the CDW spread eastward in the East China Sea with a time lag of 1 to 2 months after the discharge.