测震仪器健康状态数据交换平台的设计与实现   总被引：4，自引：0，他引：4  

董一兵  高景春  刘胜国  毛国良  孙贵成  刘新 《地震研究》2013,36(3)

介绍了测震仪器健康状态数据交换软件平台的设计与实现.在软件开发过程中,主要使用了TCP/IP Socket编程、并发程序设计和JMS消息机制等关键技术,实现了与多种地震数据采集器的并发式网络通信以及健康状态数据的接收和交换.开源的消息中间件ActiveMQ作为统一交换平台,为仪器健康状态的交换共享提供了统一的数据接口,便于实现系统与新业务的无缝集成,提高了系统的弹性和可扩展性.利用本系统的框架模式开发的测震台站远程监视系统在河北测震台网得到了成功的应用,其功能和性能均达到了设计预期效果.  相似文献   

基于WebServices的新农村公共服务平台设计与实现     

卓嵩  蔡国林  黄瑞金  蒋红兵 《测绘科学》2013,38(1):163-165

本文针对新农村公共服务平台在信息交互性方面的需求及WebGIS在此方面的不足,提出基于RIA和WebServices的在线交互空间异构属性数据方法,分析相关空间异构属性数据类型,阐述相应数据模型和自定义WebServices的设计思路和基于该方法的四川省某县新农村公共服务平台主要功能的实现。  相似文献   

A Sensitivity Study of Arctic Ice-Ocean Heat Exchange to the Three-Equation Boundary Condition Parametrization in CICE6     

Lei YU  Jiping LIU  Yongqi GAO  Qi SHU 《大气科学进展》2022,39(9):1398-1416

In this study, we perform a stand-alone sensitivity study using the Los Alamos Sea ice model version 6 (CICE6) to investigate the model sensitivity to two Ice-Ocean (IO) boundary condition approaches. One is the two-equation approach that treats the freezing temperature as a function of the ocean mixed layer (ML) salinity, using two equations to parametrize the IO heat exchanges. Another approach uses the salinity of the IO interface to define the actual freezing temperature, so an equation describing the salt flux at the IO interface is added to the two-equation approach, forming the so-called three-equation approach. We focus on the impact of the three-equation boundary condition on the IO heat exchange and associated basal melt/growth of the sea ice in the Arctic Ocean. Compared with the two-equation simulation, our three-equation simulation shows a reduced oceanic turbulent heat flux, weakened basal melt, increased ice thickness, and reduced sea surface temperature (SST) in the Arctic. These impacts occur mainly at the ice edge regions and manifest themselves in summer. Furthermore, in August, we observed a downward turbulent heat flux from the ice to the ocean ML in two of our three-equation sensitivity runs with a constant heat transfer coefficient (0.006), which caused heat divergence and congelation at the ice bottom. Additionally, the influence of different combinations of heat/salt transfer coefficients and thermal conductivity in the three-equation approach on the model simulated results is assessed. The results presented in this study can provide insight into sea ice model sensitivity to the three-equation IO boundary condition for coupling the CICE6 to climate models.  相似文献   

黄河源高寒草原下垫面土壤冻融过程中陆-气间的水热交换特征分析     

武月月  文军  王作亮  贾东于  刘闻慧  蒋雨芹  陆宣承 《高原气象》2022,(1):132-142

高寒草原水热交换的季节性特征显著,土壤冻融过程对地-气水热交换有着重要的影响.本文利用黄河源区汤岔玛小流域2014年5月至2015年5月陆面过程观测数据,将土壤冻融过程划分为完全融化(TT)和完全冻结(FF)两种状态与融冻(T-F)和冻融(F-T)两个过程,并分析了期间高寒草原下垫面净辐射、感热通量、潜热通量和地表热通...  相似文献   

Cotton Fiber/ZrO2, A New Material for Adsorption of Cr(VI) Ions in Water     

Alfredo Alberto Muxel  Sonia Maria Nobre Gimenez  Flaveli Aparecida de Souza Almeida  Rení Ventura da Silva Alfaya  Antonio Alberto da Silva Alfaya 《洁净——土壤、空气、水》2011,39(3):289-295

The natural cotton fiber was used to synthesize an anion exchange, containing ZrO₂ film on its surface, NCFZC (natural cotton fiber/ZrO₂ composite). This anion exchanger was produced by the reaction of the zirconium oxychloride and hydroxyl groups on surface of the natural cotton fiber. The material was used for Cr(VI) ions adsorption studies. Adsorption equilibrium time and optimum pH for Cr(VI) adsorption were found to be 6 h and 4.0, respectively. The Langmuir and Temkin isotherms were used to models adsorption equilibrium data. The adsorption capacity of NCFZC was found to be 1.33 mmol/g. Kinetic studies showed that the rate of adsorption of Cr(VI) on NCFZC obeyed a pseudo‐second‐order kinetic model.  相似文献   

淹水解除后互叶白千层幼苗光合特性的恢复     

靖元孝  刘瑞仙  肖林  李国梁  杨丹菁 《湿地科学》2011,9(4):361-366

为了优选用于河岸、库岸等间歇性淹水地区植被恢复的适生树种,研究了30d完全淹水解除后互叶白干层(Melaleuca alternifolia)幼苗气体交换特性、叶绿素荧光特性和质膜透性的恢复情况.在全淹30d及退水后70d的恢复生长过程中,互叶白干层成活率为100％.经过30d的全淹处理,互叶白干层的叶绿素含量、净光合...  相似文献   

Numerical studies of methane production from Class 1 gas hydrate accumulations enhanced with carbon dioxide injection   总被引：2，自引：0，他引：2  

M.D. White  S.K. WurstnerB.P. McGrail 《Marine and Petroleum Geology》2011,28(2):546-560

Class 1 gas hydrate accumulations are characterized by a permeable hydrate-bearing interval overlying a permeable interval with mobile gas, sandwiched between two impermeable intervals. Depressurization-induced dissociation is currently the favored technology for producing gas from Class 1 gas hydrate accumulations. The depressurization production technology requires heat transfer from the surrounding environment to sustain dissociation as the temperature drops toward the hydrate equilibrium point and leaves the reservoir void of gas hydrate. Production of gas hydrate accumulations by exchanging carbon dioxide with methane in the clathrate structure has been demonstrated in laboratory experiments and proposed as a field-scale technology. The carbon dioxide exchange technology has the potential for yielding higher production rates and mechanically stabilizing the reservoir by maintaining hydrate saturations. We used numerical simulation to investigate the advantages and disadvantages of using carbon dioxide injection to enhance the production of methane from Class 1 gas hydrate accumulations. Numerical simulations in this study were primarily concerned with the mechanisms and approaches of carbon dioxide injection to investigate whether methane production could be enhanced through this approach. To avoid excessive simulation execution times, a five-spot well pattern with a 500-m well spacing was approximated using a two-dimensional domain having well boundaries on the vertical sides and impermeable boundaries on the horizontal sides. Impermeable over- and under burden were included to account for heat transfer into the production interval. Simulation results indicate that low injection pressures can be used to reduce secondary hydrate formation and that direct contact of injected carbon dioxide with the methane hydrate present in the formation is limited due to bypass through the higher permeability gas zone.  相似文献   

Simultaneous solution for water,heat and salt balances in a Mediterranean coastal lagoon (Mar Menor,Spain)     

V. Martínez-Alvarez  B. Gallego-ElviraJ.F. Maestre-Valero  M. Tanguy 《Estuarine, Coastal and Shelf Science》2011

A modelling approach is proposed to evaluate the environmental dynamics of coastal lagoons. The water, heat and salt balances are addressed simultaneously, providing a better estimation of evaporation and water exchanges. Compared to traditional approaches, the model presented accounts for the effects of water salinity, heat storage and net energy advected in the water body. The model was applied daily to the Mar Menor coastal lagoon (SE Spain) from 2003 through 2006. Water exchanges with the Mediterranean Sea were estimated based on the monthly trend of the lagoon salinity and were correlated with monthly averages of wind speed. The mean daily water exchange with the sea was 1.77 hm³ d⁻¹. This exchange accounted for only 1% of the heat losses in the lagoon heat balance, and it is the most important flow in the water balance. The mean annual evaporation flux amounted to 101.3 W m⁻² (3.55 mm d⁻¹), while the sensible heat flux amounted to 19.7 W m⁻², leading to an annual Bowen ratio on the order of 0.19. To validate the model, daily water temperatures were predicted based on the daily heat balance of the water body and were compared with remote sensing data from water surface standard products.  相似文献   

Spatial variability and temporal dynamics of surface water pCO₂, ��O₂/Ar and dimethylsulfide in the Ross Sea, Antarctica     

P.D. Tortell  C. Guéguen  M.C. Long  C.D. PayneP. Lee  G.R. DiTullio 《Deep Sea Research Part I: Oceanographic Research Papers》2011,58(3):241-259

We report results from two surveys of pCO₂, biological O₂ saturation (??O₂/Ar) and dimethylsulfide (DMS) in surface waters of the Ross Sea polynya. Measurements were made during early spring (November 2006-December 2006) and mid-summer (December 2005-January 2006) using ship-board membrane inlet mass spectrometry (MIMS) for high spatial resolution (i.e. sub-km) analysis. During the early spring survey, the polynya was in the initial stages of development and exhibited a rapid increase in open water area and phytoplankton biomass over the course of our ∼3 week occupation. We observed a rapid transition from a net heterotrophic ice-covered system (supersaturated pCO₂ and undersaturated O₂) to a high productivity regime associated with a Phaeocystis-dominated phytoplankton bloom. The timing of the early spring phytoplankton bloom was closely tied to increasing sea surface temperature across the polynya, as well as reduced wind speeds and ice cover, leading to enhanced vertical stratification. There was a strong correlation between pCO₂, ??O₂/Ar, DMS and chlorophyll a (Chl a) during the spring phytoplankton bloom, indicating a strong biological imprint on gas distributions. Box model calculations suggest that pCO₂ drawdown was largely attributable to net community production, while gas exchange and shoaling mixed layers also exerted a strong control on the re-equilibration of mixed layer ??₂ with the overlying atmosphere. DMS concentrations were closely coupled to Phaeocystis biomass across the early spring polynya, with maximum concentrations exceeding 100 nM.During the summer cruise, we sampled a large net autotrophic polynya, shortly after the seasonal peak in phytoplankton productivity. Both diatoms and Phaeocystis were abundant in the phytoplankton assemblages during this time. Minimum pCO₂ was less than 100 ppm, while ??O₂/Ar exceeded 30% in some regions. Mean DMS concentrations were ∼2-fold lower than during the spring, although the range of concentrations was similar between the two surveys. There was a significant correlation between pCO₂, ??O₂/Ar and Chl a across the summer polynya, but the strength of these correlations and the slope of O₂ vs. CO₂ relationship were significantly lower than during the early spring. Summertime DMS concentrations were not significantly correlated to phytoplankton biomass (Chl a), pCO₂ or ??O₂/Ar. In contrast to the early spring time, there were no clear temporal trends in summertime gas concentrations. Rather, small-scale spatial variability, likely resulting from mixing and localized sea-ice melt, was clearly evident in surface gas distributions across the polynya. Analysis of length-scale dependent variability demonstrated that much of the spatial variance in surface water gases occurred at scales of <20 km, suggesting that high resolution analysis is needed to fully capture biogeochemical heterogeneity in this system.  相似文献   

乐清湾水交换特征研究   总被引：4，自引：0，他引：4  

罗锋  廖光洪  杨成浩  徐晓华 《海洋学研究》2011,29(2):79-88

采用EFDC模式模拟研究了乐清湾水交换的三维过程和时空变化特征,并通过计算水示踪剂质量浓度分析水体置换过程。结果表明,乐清湾水交换主要是由鹿西岛两侧流入的外海水体与湾内水体的交换,以及乐清湾口门西侧附近的湾内水体与瓯江北口径流冲淡水之间的交换。从口门到湾顶,水交换能力差别较大。以最窄的连屿至打水山断面为界,以南水体1个月基本可以完全交换,而以北水体2个月后仍然无法交换至湾口水平。连屿至打水山断面以北地形复杂,岛屿较多,污染物主要通过岛屿间的潮汐汊道输运,断面的瓶颈效应也使得断面以北的水体交换能力稍弱。在口门附近90%以上的水体被外海置换所需时间不到5 d,而此时湾顶水质未有太大改变;15 d左右,80%湾内水体被外海水置换;90%湾内水体被置换仅需40 d;70 d时的水体置换率达97%。  相似文献