失控(上)     

凌晨 《海洋世界》2015,(3):48-51

<正>"13146-K,目标350米。感应雷达自动关闭。"领航员3号报告。"13146-J,目标350米。感应雷达自动关闭。"领航员3号继续报告,十分轻松。"1313 9-I,目标3 5 0米。感应雷达自动关闭。"领航员5号报告,揉揉疲惫的眼睛,继续跟踪下一个目标讯息。面前的显示屏上,代表13139-g的亮点却一动不动。"13139-g,13139-g,13139-g?"领航员5号睁大眼睛,连声呼唤,不断按动鼠标,那亮点却像粘牢在屏幕中了一样,领航员5号拍打键盘。显示屏一分为二,出现13139-g的视野,画面来自13139-g携带的水下摄影仪。视野中尽是混浊黑暗近乎  相似文献   

环境友好型农业技术扩散的时空演化与影响因素——基于社会网络视角     

蔡丽茹  吴昕晖  杜志威 《地理研究》2022,41(1):63-78

面对严峻的农业面源污染问题,环境友好型农业技术的推广和落地对于中国实现乡村生态振兴和农业农村现代化具有重要意义。但现实中,该类型技术在乡村地区一直面临推广难,采纳度低的问题。以往众多研究证明,社会网络是技术扩散的有效途径和支撑。基于此,本文从社会网络的视角构建了农业技术创新扩散的理论框架,通过2016—2020年广东省农业面源污染治理的实践调研及10个县市3015份问卷数据的定量分析,总结出环境友好型农业技术扩散的四个阶段：① 初始阶段：农户间简单离散的技术互动。② 单核阶段：精英农户的点式嵌入与拟亲缘网络扩散。③ 多核阶段：多个精英农户形成与业缘关系网络扩散。④ 高水平互动阶段：农业经济组织的形成与功能性网络扩散。个体资源禀赋、技术有效性及感知度、技术传播方式和外部环境作为技术扩散的四个主要影响因素,在不同的阶段发挥着不同的作用。本研究成果有助于理解中国农业技术扩散的实践逻辑和底层机制,对同类技术推广有重要的政策意义。  相似文献   

吴堡矿区首采地段水文地质特征及矿床充水条件分析   总被引：1，自引：0，他引：1  

高春华  张鹏晖  张俊峰  李成伟 《中国煤炭地质》2010,(5):36-44

从鄂尔多斯盆地东部地下水类型、含水岩组等区域水文地质条件入手,对陕北石炭二叠纪煤田吴堡矿区首期开采地段水文地质条件进行了分析。分析表明,区内第四系松散层含水层在首采区虽然分别较广,但水量相对较小,正常情况下与其下含水层贯通的可能性较小,对于煤矿开采影响较小;基岩风化裂隙潜水、太原组灰岩溶隙裂隙及砂岩裂隙承压水及奥陶系灰岩岩溶承压水是煤矿开采中最为主要的突水类型。从矿坑充水水源、充水通道和充水强度角度对首期开采地段进行了矿床充水因素的研究。研究认为,矿井充水水源为煤层顶底板砂岩裂隙水、灰岩裂隙溶隙承压水及奥陶系岩溶承压水;充水通道主要是煤层开采后顶板形成的冒落带和导水裂隙带以及底板受其承压水的影响而产生的破坏带。建议在矿井设计前对首采地段进行三维地震勘探,进一步查明区内断层性质、规模和易发生矿井涌水的部位,为建井设计、矿坑底板的突水和防治提供依据。  相似文献   

2010年12月15日江西雨雪天气的微物理数值模拟分析     

陈兴旺  刘晓晖  罗国金  胡伟 《气象与减灾研究》2011,34(3):30-35

利用常规观测资料和中尺度数值模式WRF的输出产品,对2010年12月14—15日发生在江西的雨雪过程进行了分析。结果表明,微物理参数化方案输出的物理因子可以较好地揭示本次过程的雨雪转换;在雨转雪阶段,由于中低层冷空气南移较强,没有形成逆温,因此未能形成冻雨,而是由雨转为降雪天气。  相似文献   

黄河口邻近水域中华哲水蚤现场食物组成的分子生物学检测简     

黄有松  徐东晖  陈洪举 《中国海洋大学学报(自然科学版)》2014,(3):83-91

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Diagnostic model construction and example analysis of habitat degradation in enclosed bay: I. diagnostic model construction     

于格  孙芃  刘光兴  徐东晖  丁光茂  黄东仁 《中国海洋湖沼学报》2014,32(3):626-635

Presently, research is lacking regarding the diagnosis and evaluation of habitat degradation in enclosed bay systems. We established a diagnostic model for enclosed bay habitat degradation （EBHD model） using a multi-approach integrated diagnostic method in consideration of driving force-pressure- state-influence-response. The model optimizes the indicator standardization with annual average change rate of habitat degradation as the basic element, to reflect accurately the impact of the change and speed of degradation on the diagnostic results, to quantify reasonably the contribution of individual diagnostic indicator to habitat degradation, and to solve the issue regarding the influence of subjective factors on the evaluation results during indicator scoring. We then applied the EBHD model for the Sansha Bay in Fujian Province, China, evaluated comprehensively the situation of habitat degradation in the bay, and screened out the major controlling factors in the study area. Results show that the diagnostic results are consistent in overall with the real situation of the study area. Therefore, the EBHD model is advantageous in terms of objectivity and accuracy, making a breakthrough in diagnosis and evaluation for habitat degradation in enclosed bay systems.  相似文献   

Diagnostic model construction and example analysis of habitat degradation in enclosed bay: II. spatiotemporal variations in habitat degradation in Sansha Bay   总被引：1，自引：0，他引：1  

于格  孙芃  刘光兴  徐东晖  丁光茂  黄东仁 《中国海洋湖沼学报》2014,32(3):636-644

The process of habitat degradation varies in habitat type and driving force which shows certain spatial and temporal heterogeneity on regional scales. In the present study, a new diagnostic model for enclosed bay habitat degradation was established, with which the spatial and temporal variation patterns of habitat degradation during 1991–2012 in Sansha Bay, Fujian, China was investigated. The results show that anthropogenic disturbance is the major controlling factor for the habitat degradation in large temporal heterogeneity in the bay. On the other hand, the habitat degradation experienced signifi cant spatial variations among six sub-bays. Under the joint action of temporal and spatial heterogeneity, the degradation trend in growing scale shows a more signifi cant correlation with the distribution of local leading industries along shorelines. Therefore, we quantifi ed the main characters of habitat degradation in Sansha Bay, and have understood the relationship between the status of habitats spatio-temporal variation value and the main controlling factor leading to the changes. However, a defi ciency of this research is the lack of or inaccessible to the detailed data, which shall be better solved in the future study for accessing more data from more sources.  相似文献   

基于G/S的应急管理应用     

陈垦  苗放  程付超  杨文晖  王方 《中国地质灾害与防治学报》2013,24(2):102-106

城市化、新型工业化及全球化进程的进一步融合,公共安全问题发生频度将大大增加.由于防范意识的淡薄,以及预警不力等因素导致对突发事件类别和级别较难合理的判识,对应急管理机构和平台资源较难高效的应用.给人民生命财产安全带来极大的隐患.通过以数据为核心、标识为主线,提出G/S模式,在此基础上实现应急预案建模,结合四川省应急指挥系统进行验证,建立一套原型系统,为应急管理的高可用性、高安全性服务;为国家的产业化推广提供理论基础与技术支持.  相似文献   

Transient response of a beam on viscoelastic foundation under an impact load during nondestructive testing   总被引：1，自引：1，他引：0  

孙璐罗飞全  陈东晖 《地震工程与工程振动(英文版)》2005,4(2):325-333

Beam responses under an impact NDT load are studied using the Fourier and Laplace transforms. Numerical computation is performed for a parametric study of beam and load parameters. It is shown that under an impact load, the time duration for displacement to vanish is ten times longer than that for velocity and acceleration. The maximum response is achieved first in acceleration, followed by velocity, and finally displacement, all of which occur before the impact load is removed. At the moment that the impact load is removed from the beam, there is a discontinuity in the velocity and acceleration responses, but not in displacement response. The effect of K and ph on beam response is much less significant than that of El and C, which have similar effect on beam response. As El increases, peak values of displacement, velocity and acceleration response decrease. The effect of K on beam response only becomes appreciable after the impact load is removed. While the peak of displacement remain almost unchanged as K increases, the displacement response decays to zero faster for large K values than for small K values.  相似文献   

旁压试验成果应用   总被引：2，自引：0，他引：2  

顾国荣  陈晖 《上海国土资源》1996,(4):20-30

通过几项工程对旁压试验的应用及其资料的整理分析,给出了估算软土不排水抗剪强度,砂土内摩擦角等参数的经验关系式以及应用旁压试验成果估算地基土强度、单桩承载力和基础沉降量等。  相似文献