高空气象探测数据评定方法研究     

Zhang Yongliang 《河南气象》2007,(Z1)

介绍了高空气象探测中数据不确定度的分析方法,并提出优化测量方案。  相似文献   

Experimental determination of the hydrothermal solubility of ReS₂ and the Re–ReO₂ buffer assemblage and transport of rhenium under supercritical conditions     

Yongliang Xiong  Scott A Wood 《Geochemical transactions》2002,3(1):1

To understand the aqueous species important for transport of rhenium under supercritical conditions, we conducted a series of solubility experiments on the Re–ReO₂ buffer assemblage and ReS₂. In these experiments, pH was buffered by the K–feldspar–muscovite–quartz assemblage; in sulfur-free systems was buffered by the Re–ReO₂ assemblage; and and in sulfur-containing systems were buffered by the magnetite–pyrite–pyrrhotite assemblage. Our experimental studies indicate that the species ReCl₄ ⁰ is dominant at 400°C in slightly acidic to near-neutral, and chloride-rich (total chloride concentrations ranging from 0.5 to 1.0 M) environments, and ReCl₃ ⁺ may predominate at 500°C in a solution with total chloride concentrations ranging from 0.5 to 1.5 M. The results also demonstrate that the solubility of ReS₂ is about two orders of magnitude less than that of ReO₂. This finding not only suggests that ReS₂ (or a ReS₂ component in molybdenite) is the solubility-controlling phase in sulfur-containing, reducing environments but also implies that a mixing process involving an oxidized, rhenium-containing solution and a solution with reduced sulfur is one of the most effective mechanisms for deposition of rhenium. In analogy with Re, TcS₂ may be the stable Tc-bearing phase in deep geological repositories of radioactive wastes.  相似文献   

西北干旱农牧交错带地表基质调查成果经验     

张思源  袁帅  邢怡  刘永新  王永亮 《地质论评》2024,70(S1):331-332

  相似文献   

利用改进的TurboEdit算法与Chebyshev多项式探测与修复周跳   总被引：1，自引：0，他引：1  

刘宁  熊永良  徐韶光 《武汉大学学报(信息科学版)》2011,36(12):1500-1503

根据利用TurboEdit方法对GPS观测数据进行周跳探测的特点,设计了固定弧段长度的滑动窗口拟合模型,对其中的Geometry-Free组合法进行改进;在探测出周跳后,利用最小二乘Chebyshev多项式拟合来修复周跳。实验结果表明,改进后的TurboEdit算法可以探测出等周的1周小周跳、等周的大周跳和连续的小周跳、大周跳,同时,最小二乘Chebyshev多项式拟合可以精确修复以上周跳对。  相似文献   

上海港温室主楼抗震性能分析     

唐玉  郑七振  鲍永亮  王东  康伟 《世界地震工程》2011,27(4)

上海港温室主楼建筑造型新颖、结构体系独特,使其结构动力特性和地震响应十分复杂.为了给结构抗震设计提供可靠的依据,主要研究了结构的自振特性,并应用有限元数值方法分别对结构在多遇和罕遇地震作用下的动力时程响应进行了分析.同时采用弹塑性静力(推覆)分析方法对结构在罕遇地震作用下的地震响应及推覆过程中塑性铰的分布状态进行了研究.结果表明,结构不存在明显的扭转不规则现象,且满足现行规范提出的各项抗震设防要求和既定的各项抗震性能指标,具有可靠的抗震承载力.  相似文献   

Organic species of lanthanum in natural environments: Implications to mobility of rare earth elements in low temperature environments     

Yongliang Xiong 《Applied Geochemistry》2011,26(7):1130-1137

Naturally occurring organic ligands, such as acetate, citrate, malonate, oxalate, and succinate, play important roles in mobility and accumulation of La and other rare earth elements in low temperature systems under Earth surface conditions. However, a comprehensive and consistent thermodynamic database covering the complexes of rare earth elements with those naturally occurring organic ligands is lacking. In this study, thermodynamic data of organic species of rare earth elements (REE) represented by La, with an emphasis on their aqueous complexes with organic ligands, are critically reviewed. The organic ligands covered by this study include acetate, citrate, malonate, oxalate and succinate. In this critical review, the Specific Interaction Theory (SIT) model is adopted for extrapolation to infinite dilution. This model is a reliable activity coefficient model valid for a wide range of ionic strengths. These critically reviewed data, including complex formation constants, SIT interaction coefficients and solubility product constants, would enable accurate modeling of the speciation and solubility of REE in various environments including high ionic strength environments, providing insight into mobility and enrichment of REE in various environments.  相似文献   

Temporal and spatial variations of global solar radiation over the Qinghai–Tibetan Plateau during the past 40 years     

Ren Li  Lin Zhao  Tonghua Wu  Yongjian Ding  Yufei Xin  Defu Zou  Yao Xiao  Yongliang Jiao  Yanhui Qin  Linchan Sun 《Theoretical and Applied Climatology》2013,113(3-4):573-583

Global solar radiation is of great significance to the balance of ground surface radiation, the energy exchange between the Earth’s surface and atmosphere, and the development of weather and climate systems in various regions. In this study, the monthly global radiation recorded at 23 stations over the Qinghai–Tibetan Plateau (QTP) was utilized to estimate global solar radiation (Q) from sunshine duration and to obtain improved fits to the variation coefficients of the monthly Angström–Prescott model (APM). The modeling results were evaluated by calculating the statistical errors, including mean bias error, mean absolute error, root mean square error, and mean relative error. We demonstrate that the monthly Q values can be predicted accurately by APM over the QTP. We also assess the variations of Q values at 116 meteorological stations by APM over the QTP during 1961–2000. The analysis shows that the annual mean sunshine duration amounted to more than 3,000 h over the whole plateau, implying promising prospects for economic applications of solar energy. During the past 40 years, the mean global solar radiation has been relatively high in the western QTP, extending northward to the Inner Mongolian Plateau. Although its decadal variations in the QTP and surrounding regions were inconsistent, the anomaly values of global solar radiation were generally positive during the 1960s and 1970s, indicating that the QTP’s global solar radiation has increased during those periods. The anomaly values were negative during the 1980s and 1990s, showing that the plateau’s global solar radiation has decreased during those periods. Global solar radiation over the QTP is negatively proportional to latitude but positively proportional to altitude and relative sunshine duration. Three factors, the sunshine duration, latitude, and altitude, exert great influence on global surface radiation, of which sunshine duration is most significant. A high-variation-coefficient zone of global solar radiation occurred in the western part of the QTP but, on average, the variation coefficient of the plateau’s global solar radiation was only 0.031, suggesting that the variation in global radiation was relatively stable over the whole QTP.  相似文献   

科技兴农在宁南     

杨永良 《山地学报》1990,(4)

宁南县重视农业技术的推广,促进了农业生产的发展,农业总产值1989年达5208万元,比1976年增长1.2倍。这表明依靠科技进步,振兴山区农业,是发展经济的必由之路。本县将采取有力措施,大搞科技兴农,争取更上一层楼。  相似文献   

Analysis of Wave Distributions Using the WAVEWATCH-Ⅲ Model in the Arctic Ocean     

SHAO Weizeng  YU Wupeng  JIANG Xingwei  SHI Jian  WEI Yongliang  JI Qiyan 《中国海洋大学学报(英文版)》2022,21(1):15-27

In this work, we examined long-term wave distributions using a third-generation numerical wave model called WAVE- WATCH-Ⅲ(WW3) (version 6.07). We also evaluated the influence of sea ice on wave simulation by using eight parametric switches. To select a suitable ice-wave parameterization, we validated the simulations from the WW3 model in March, May, September, and December 2017 against the measurements from the Jason-2 altimeter at latitudes of up to 60?N. Generally, all parameterizations ex-hibited slight differences, i.e., about 0.6 m root mean square error (RMSE) of significant wave height (SWH) in May and September and about 0.9 m RMSE for the freezing months of March and December. The comparison of the results with the SWH from the European Centre for Medium-Range Weather Forecasts for December 2017 indicated that switch IC4_M1 performed most effec-tively (0.68 m RMSE) at high latitudes (60?– 80?N). Given this finding, we analyzed the long-term wave distributions in 1999 – 2018 on the basis of switch IC4_M1. Although the seasonal variability of the simulated SWH was of two types, i.e., 'U' and 'sin' modes, our results proved that fetch expansion prompted the wave growth. Moreover, the interannual variability of the specific regions in the 'U' mode was found to be correlated with the decade variability of wind in the Arctic Ocean.  相似文献   

音频大地电磁法在怀化方石坪村红层找水中的应用研究   总被引：1，自引：1，他引：0  

邬健强  甘伏平  张伟  刘永亮  魏巍  朱超强 《中国岩溶》2018,37(6):918-924

文章采用音频大地电磁法,在怀化方石坪村红层进行找水应用研究。结果表明:（1）音频大地电磁法在该红层区是一种有效的物探方法,虽然该红层区电阻率值低,电性差异小,但音频大地电磁法是综合利用岩土层（体）的电性特征和磁性特征来分辨异常,电性差异对其影响相对较小;（2）数据处理的结果能很好地指示出异常特征和比较具体的异常位置,推断结果与钻井验证结果基本一致,最大涌水量为82.94 m3·d-1 ;（3）钻孔处视电阻率测深曲线ρs能有效地对地下电性结构进行评价,其K曲线将ρs 曲线中的微弱变化进行放大,突出异常,标示该红层区地下异常比较具体的深度和分层位置,分层结果与钻孔结果基本一致。   相似文献