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甘雨  隋立芬  肖国锐  段宇  戚国宾 《大地测量与地球动力学》2014,34(3):129-132

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Characteristics and mechanisms of the sudden warming events in the nocturnal atmospheric boundary layer: A case study using WRF          下载免费PDF全文

马媛媛  杨毅  胡小明  甘茹蕙 《Acta Meteorologica Sinica》2015,29(5):747-763

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On the possible mechanism of the first ground level enhancement in cosmic ray intensity of solar cycle 24     

Kazi A. Firoz  W. Q. Gan  Y. P. Li  J. Rodriguez-Pacheco 《Astrophysics and Space Science》2014,350(1):21-32

We have carried out this work to comprehend the possible mechanisms of the first ground level enhancement (GLE71 17 May 2012 01:50 UT) in cosmic ray intensity of the solar cycle 24. For this, the cosmic ray intensities registered by neutron monitors at several sites have been analyzed and studied with concurrent solar flares of different energy channels. To assess empirically whether the GLE might have been caused by the energy released from solar flare or CME-driven shock, we identify the possible time line in terms of the lowest spectral index determined from proton fluxes. If the GLE is caused by the energy released from particle acceleration in solar flare, the intensive phase of the flare representing the extreme emission should exist within/around the possible time line. In this respect, it is observed that the possible time line lies within the prominent phase of CME-driven shock. For better understanding, we have checked the possible relativistic energy with respect to solar flare as well as CME-driven shock. As witnessed, if the extreme emission phase of the flare is considered as the reason for the causation of GLE peak, the flare components procured insufficient amount of energy (≤～0.085 GeV) to produce a GLE. If the extreme emission phase of the flare is also considered as the dominator along GLE onset, the possible energy procurement (≤～0.414 GeV) is still not adequate to produce a GLE. In contrast, the CME-driven shock is capable of procuring enough possible relativistic energy (≥～1.21 GeV) that is sufficient amount of the energy for a GLE production. Any amount of the energy (<0.414 GeV) released from preceding flare components is supposed to have been contributed to the shock process. Thus, it is assumed that the GLE71 was possibly caused by the energy released from the shock acceleration, which might have been boosted by the energy emanated from preceding flare.  相似文献   

地热系统深部热能聚敛理论及勘查实践     

王贵玲  蔺文静  刘峰  甘浩男  王思琪  岳高凡  龙西亭  刘彦广 《地质学报》2023,97(3):639-660

深部热能聚敛及富集过程研究是地热资源探测评价的重要基础。地热壳构热控理论是以地球动力学理论为基础,以构造控热作用研究为主线,通过大地构造学、构造地质学、地热地质学等学科理论和方法,研究深部热能聚敛过程及热异常分布规律,分析各种构造要素间的相互作用及控热机制,探讨地热资源靶区预测方法,从而指导地热勘查的科学。本文系统论述了地热壳构热控理论的内涵与外延,提出了我国不同类型地热资源“同源共生-壳幔生热-构造聚热”的客观自然规律,分析了我国陆区壳幔尺度热流配分格局与不同地质背景条件下影响浅地表温度场的主要控热构造,并以渤海湾盆地、青藏高原、东南沿海等我国主要地热系统为研究对象,以壳构热控理论为指导,以勘查区找热为出发点,以控热作用内生因素(壳幔生热)和外生因素(构造聚热)为切入点,通过研究影响壳幔生热、壳内传热、勘查靶区聚热这一地球物理过程,确定了不同构造背景下地热系统的主要控热构造。从传统的经验式找热到建立构造控热预测标志,再到水热型地热资源-干热型地热资源共生富集认知,理论认识的创新发展,将引领和支撑我国地热资源不断实现高效勘探和开发利用。  相似文献   

Prevalence and risk assessment of antibiotics in riverine estuarine waters of Larut and Sangga Besar River,Perak     

Low  Kyleyoung  Chai  Layching  Lee  Choonweng  Zhang  Gan  Zhang  Ruijie  Vahab  Vaezzadeh  Bong  Chuiwei 《中国海洋湖沼学报》2021,39(1):122-134

Antibiotics released into the environment through anthropogenic activities exert selective pressure,driving bacteria towards increasing antimicrobial resistance.The prevalence of antibiotics and the ecological risks posed in the riverine estuarine of Larut River and Sangga Besar River,which included wastewater effluents from hospital,zoo,and poultry slaughterhouse sources were investigated.Solid phase extraction(SPE) followed by high-performance liquid chromatography tandem mass chromatography(HPLC-MS/MS) were used to extract and quantify the antibiotic residues from 22 antibiotics belonging to six major antibiotic classes(sulfonamide,macrolide,fluoroquinolone,phenicol,trimethoprim,and tetracycline).Sixteen antibiotic residues were detected with concentrations ranging from limit of detection(LOD) to 1 262.3 ng/L.Fluoroquinolones and macrolides were the most frequently detected compounds.Erythromycin,clarithromycin and ofloxacin detected in hospital and zoo effluents posed a high risk to algae while tetracycline had low to medium ecological risks toward all the relevant organisms from aquatic environments(algae,invertebrate Daphnia magna,and fish).  相似文献   

两种贯通潜孔锤反循环钻头应用效果及理论分析     

吴冬宇  殷琨  甘心  张鑫鑫  殷其雷 《吉林大学学报(地球科学版)》2017,47(1)

对于矿区钻孔作业存在的粉尘污染严重、岩矿心采取困难等问题,常规金刚石钻进取心难以满足现场施工要求。采用贯通式潜孔锤反循环连续取心技术替代常规金刚石取心工艺,在保证了较高钻进效率的同时,可有效解决干旱缺水矿区存在的取心及其引起的污染问题,保障施工人员的身体健康。为此,笔者所在课题组研发了两种新型潜孔锤反循环钻头并进行了野外试验,同时,运用LSDYNA数值模拟对设计的两种反循环钻头进行了强度分析。试验结果表明,两种钻头均具有较好的碎岩钻进效果,但花键内喷孔式反循环钻头易发生断裂;数值模拟分析结果显示,钻头的最大应力远高于材料疲劳极限是造成钻头破坏的根本原因,数值模拟结果与试验结果取得了较好的一致性。由此证实了花键内喷孔式反循环钻头结构存在缺陷,设计时应尽量避免在内喷孔周围设置环槽,以保证钻头体强度。  相似文献   

New record of the genus Phycocaris Kemp, 1916 (Decapoda: Caridea: Hippolytidae) from Hainan Island,China     

Gan  Zhibin  Li  Xinzheng 《中国海洋湖沼学报》2017,35(3):664-667

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Seasonal variability of eddy characteristics and energetics in the Kuroshio Extension     

Yang  Chen  Yang  Haiyuan  Chen  Zhaohui  Gan  Bolan  Liu  Yongzheng  Wu  Lixin 《Ocean Dynamics》2023,73(8):531-544

Ocean Dynamics - Based on the eddy-resolving Four-dimensional variational Ocean Re-Analysis for the Western North Pacific over 30&nbsp;years (FORA-WNP30) product, this study investigates the...  相似文献   

2020年1月24—25日贵州冰雹、雨雪共存天气机理分析          下载免费PDF全文

王芬  唐浩鹏  杨帆  罗旋  王兴菊  杨春艳  张淦 《沙漠与绿洲气象(新疆气象)》2021,15(4):17-25

利用常规观测、NCEP再分析及FY-2G TBB等资料,对贵州2020年1月24—25日的冰雹、雨雪共存天气进行分析,结果表明:(1)此次复杂天气主要由南支槽前强上升运动把低空急流带来的充沛水汽强迫抬升至-10℃以上,前期能量集聚使得大气不稳定度迅速加大,滇黔静止锋触发贵州南部不稳定能量释放,共同造成了此次天气。(2)冰雹是由高架雷暴造成的,暖湿逆温层、强垂直风切变、强不稳定层结和合适的温度垂直分布是发生强对流的主要原因。(3)冷锋及深厚南支槽是降雪发生的主要环流形势,中层水汽辐合的强度及厚度不断增长、槽前动力抬升使得水汽伸展到-10℃以上,配合气温不断下降共同造成了暴雪天气。(4)贵州西部较充沛的外部水汽输送为降雨提供有利条件,高低空急流的有效叠加及典型的低层辐合、高层辐散加大降水强度。(5)强上升运动在降雪前8 h出现、涡度平流在降雪前24 h出现跃增,低层辐合的强度大于高层辐散;较之冰雹、暴雪区,大暴雪区饱和区伸展更高、上升运动更强、涡度平流更强,但水汽辐合稍弱;大暴雪区表现为稳定的低冷高暖,冰雹区、暴雪区则表现为由低到高的"冷—暖—冷"结构。(6)降雪区TBB纹理较均匀,大部在-20～-32℃,TBB低值区对应降雪强度较大,降雪最强时段TBB达-52℃。  相似文献