Results 1 to 10 of about 329,068 (264)
Global palaeogeographical implication of acritarchs in the Upper Ordovician [PDF]
Estonian Journal of Earth Sciences, 2023 The EarlyâMiddle Ordovician peri-Gondwana and Baltica acritarch provinces are easily recognizable, illustrating a clear provincialism of global phytoplankton.
Yan Kui +4 more
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Analysis on the characteristics and causes of the "23·7" torrential rainfall event in North China
暴雨灾害, 2023 An historically heavy rainfall event occurred in North China from 29 July to 1 August in 2023, causing serious disasters. In this study, the precipitation characteristics and causes of this heavy rainfall event was investigated utilizing various ...
Shunan YANG +6 more
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Dizhen xuebao, 2021 基于华北地区（37°N—42°N，113.5°E—118.5°E）133个固定地震台站收集到的P波和S波震相数据，利用双差层析成像法反演了该地区地壳三维速度结构并对所用地震进行了重定位。结果显示：地震走时残差均方根的平均值由重定位前的0.265 s下降至0.008 s；重定位后的震源主要分布于6—16 km深度范围内；重定位后的地震在地质构造上主要呈条带状分布于断裂上，在速度结构上主要分布于高低速过渡带上且偏于高速区一侧，其中唐山、邢台震源区中下地壳内低速体的存在可能与深部流体、地幔热物质上涌有关 ...
Mengdan Ma, Aihua Zhao
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Geomatics, Natural Hazards & Risk, 2022 This paper presents an analysis based on the use of historical data of frost/snow disasters in North China in combination with ArcGIS and other technical applications.
Shuoben Bi +5 more
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Childhood Narcolepsy in North China [PDF]
Sleep, 2001 The purpose is to report the results of an effort to diagnose children with narcolepsy in a pediatric referral clinic.Between September 1998 and December 1999, a program was implemented to emphasize recognition of childhood narcolepsy. Patients underwent brain computed tomography (CT) scan and magnetic resonance imaging (MRI) testing.
F, Han +6 more
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You-qi chuyun, 2021 The natural gas pipeline network in North China is well developed, and the demand of natural gas is increasing day by day. However, "1+X" business mode was formed in the intermediate links of transportation by the provincial short-distance pipeline ...
Zishu GAO +3 more
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Hydrology Research, 2020 Urbanization plays an important role in a global change, but there are few studies that combine land use with topography and precipitation. The urbanization in Jinan, a typical city of North China, between the 1980s and 2005 was analyzed by transition ...
Peijun Li +8 more
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Dizhen xuebao, 2021 本文采用基于贝叶斯原理的重力平差方法对华北地区2009—2017年的16期陆地流动重力观测资料进行了统一处理，结合研究区内2009年以来4次M≥4.5 地震活动，分析区域重力场动态演化特征。基于华北地区均衡重力异常、布格重力异常、沉积层重力异常和莫霍面重力异常，研究华北地区三维密度结构特征，分析区域重力场变化与深部密度结构之间的关系。结果表明：研究区内近年来M≥4.5地震均位于区域差分重力场和累积重力场“零值”等值线附近、异常变化剧烈的梯度带及梯度带转弯部位 ...
Weimin Xu, Lei Shi, Shi Chen, Hongyan Lu
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Spatial and seasonal patterns of atmospheric nitrogen deposition in North China
Atmospheric and Oceanic Science Letters, 2020 As one of the regions with intensive agriculture and rapid economic development in China, North China also has a high nitrogen (N) deposition. This study characterized the spatial pattern of N deposition in North China, combining the tropospheric columns
Zhen WANG +4 more
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Gaoyuan qixiang, 2023 To improve the prediction ability for summer precipitation anomalies in North China and determine the indicators of early abnormal signals， this paper uses the summer precipitation data in North and South China from 1961 to 2020， and the reanalysis ...
Lisheng HAO, Yihui DING
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