检索结果-南通市图书馆

Fundamental Research 2024年第3期4卷 516-526页

作者： jianping huang Li Zhang Bin Chen Xiaoyue Liu Wei Yan Yingjie Zhao Siyu Chen Xinbo Lian Chuwei Liu Rui Wang Shuoyuan Gao Danfeng Wang Collaborative Innovation Center for Western Ecological Safety Lanzhou UniversityLanzhou 730000China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China

Coronavirus disease 2019(COvID-19)is a severe global public health emergency that has caused a major cri-sis in the safety of human life,health,global economy,and social ***,CovID-19 poses significant challenges to healthcare systems *** prediction and early warning of infectious diseases on a global scale are the premise and basis for countries to jointly fight ***,because of the complexity of epidemics,predicting infectious diseases on a global scale faces significant *** this study,we developed the second version of Global Prediction System for Epidemiological Pandemic(GPEP-2),which combines statis-tical methods with a modified epidemiological *** GPEP-2 introduces various parameterization schemes for both impacts of natural factors(seasonal variations in weather and environmental impacts)and human so-cial behaviors(government control and isolation,personnel gathered,indoor propagation,virus mutation,and vaccination).The GPEP-2 successfully predicted the COVID-19 pandemic in over 180 countries with an average accuracy rate of 82.7%.It also provided prediction and decision-making bases for several regional-scale CovID-19 pandemic outbreaks in China,with an average accuracy rate of 89.3%.Results showed that both anthropogenic and natural factors can affect virus spread and control measures in the early stages of an epidemic can effectively control the *** predicted results could serve as a reference for public health planning and policymaking.

关键词： COVID-19 Epidemiological model Prediction GPEP SEIR Statistical-dynamic

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

次季节尺度上的“暖北极-冷欧亚”模态

科学通报 2023年第14期68卷 1721-1722页

作者：黄建平谢永坤兰州大学西部生态安全协同创新中心兰州730000

1979年以来北极地区增暖的速率约为全球平均的4倍[1].从20世纪80年代末到21世纪10年代初,欧亚大陆冬季呈现变冷的趋势[2,3].这种暖-冷对比也存在于年际和年代际尺度[3~6],即“暖北极-冷欧亚”模态.这一模态被认为和中低纬的极端天气气... 详细信息

1979年以来北极地区增暖的速率约为全球平均的4倍[1].从20世纪80年代末到21世纪10年代初,欧亚大陆冬季呈现变冷的趋势[2,3].这种暖-冷对比也存在于年际和年代际尺度[3~6],即“暖北极-冷欧亚”模态.这一模态被认为和中低纬的极端天气气候事件有关[2~9],探索其成因及其在不同时间尺度的变化,已成为当前的研究热点.

关键词：欧亚大陆季节尺度北极中低纬研究热点模态 21世纪

Neuronal tolerance to hypoxia-ischemia through recombinant adeno-associated viral vectors expressing neuronal and inducible nitric oxide synthase An in vivo study

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2008年第2期3卷 157-161页

作者： Chunmei Chen Weizhong Yang Chunhua Wang Songsheng Shi jianping Chen Yong huang Dongsheng Cai Department of Neurosurgery Union Hospital Fujian Medical University Fujian Institute of Neurosurgery Fuzhou 350001 Fujian Province China

BACKGROUND： Studies have confirmed that neuronal nitric oxide synthase （nNOS） mediates neurotoxic effects during the early stages of hypoxia-ischemia, while inducible nitric oxide synthase （iNOS） mediates delayed neurotoxicity during advanced stages of hypoxia-ischemia. OBJECTIVE： This study was designed to observe neuronal apoptosis and the expressions of nNOS, iNOS, p38 mitogen-activated protein kinase （MAPK）, and caspase-3 mRNA following transfection of recombinant adeno-associated viral vectors separately expressing nNOS and iNOS antisense （rAAV-AsnNOS and rAVV-AsiNOS, respectively） into rat brains subjected to cerebral ischemia; to analyze mechanisms underlying elevated neuronal tolerance to hypoxia-ischemia. DESIGN： A randomized controlled in vivo experiment. SETTING： Fujian Institute of Neurosurgery ＆ Department of Neurosurgery, Union Hospital, Fujian Medical University. MATERIALS： Eighty healthy adult male Sprague Dawley rats of clean grade were provided by the Zhejiang Laboratory Animal Center, China. The protocol was performed in accordance with ethical guidelines for the use and care of animals. The following vectors, rAAV-AsnNOS, rAAV-AsiNOS, and rAAV expressing the β -galactosidase gene （rAAV-LacZ）, were successfully constructed by Fujian Institute of Neurosurgery. Rabbit anti-mouse nitrotyrosine （NT） monoclonal antibody （Zhongshan Jinqiao Biotechnology Co., Ltd., Beijing, China） and reverse transcription-polymerase chain reaction （RT-PCR） kit （two-step method）（Promega Company, USA） were used in this study. METHODS： This study was performed at the Fujian Institute of Neurosurgery in December 2003. Sixty rats were randomly divided into 3 groups, with 20 rats in each group： rAAV-AsnNOS group, rAAV-AsiNOS group, and rAAV-LacZ group. The remaining 20 rats served as controls. Pre-treated viral vectors （rAAV-AsnNOS, rAAV-AsiNOS, and rAAV-LacZ, respectively; each 50μL, virus titer of 2×10^9 viral particles/mL） were transfected into the cerebral cortex o

关键词： cerebral ischemia NOS, apoptosis rAAV

Application system and data description of the China Seismo-Electromagnetic Satellite

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2018年第6期2卷 444-454页

作者： jianping huang XuHui Shen XueMin Zhang HengXin Lu Qiao Tan Qiao Wang Rui Yan Wei Chu YanYan Yang DaPeng Liu Song Xu Institute of Crustal Dynamics China Earthquake Administration Institute of Earthquake Forecasting China Earthquake Administration

The China Seismo-Electromagnetic Satellite, launched into orbit from Jiuquan Satellite Launch Centre on February 2 nd, 2018, is China's first space satellite dedicated to geophysical exporation. The satellite carries eight scientific payloads including high-precision magnetometers to detect electromagnetic changes in space, in particular changes associated with global earthquake disasters. In order to encourage and facilitate use by geophysical scientists of data from the satellite's payloads, this paper introduces the application systems developed for the China Seismo-Electromagnetic Satellite by the Institute of Crustal Dynamics, China Earthquake Administration;these include platform construction, data classification, data storage, data format, and data access and acquisition.

关键词： China Seismo-Electromagnetic Satellite application system geophysical field data classification

基于双重孔隙理论的各向异性致密油砂岩地震岩石物理模型

在线全文

学校读者我要写书评

暂无评论

石油学报 2015年第10期36卷 1248-1259页

作者：黄欣芮黄建平李振春中国石油大学地球科学与技术学院山东青岛266580

致密油砂岩储层低孔低渗、矿物组分多样以及孔隙结构复杂,为岩石物理建模带来了较大挑战。基于致密油砂岩的特殊性,从岩石固体组分和孔隙结构2个方面对致密油砂岩地震岩石物理模型做了改进,实现了基于双重孔隙理论的各向异性致密砂岩油... 详细信息

致密油砂岩储层低孔低渗、矿物组分多样以及孔隙结构复杂,为岩石物理建模带来了较大挑战。基于致密油砂岩的特殊性,从岩石固体组分和孔隙结构2个方面对致密油砂岩地震岩石物理模型做了改进,实现了基于双重孔隙理论的各向异性致密砂岩油储层的岩石物理建模方法,并系统研究了新理论模型下泥质含量和泥质类型、孔隙连通性以及孔隙类型4种因素对岩石物理建模的影响。研究结果表明,泥质、孔隙连通性和孔隙类型对致密油砂岩均会产生较大的影响,证实了所提出的岩石物理建模方法的合理性。

关键词：致密油砂岩地震岩石物理模型双重孔隙模型孔隙连通性各向异性

The global response of temperature to high-latitude vegetation greening in a two-dimensional energy balance model

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2020年第1期13卷 80-87页

作者： BI Lu HE Yongli huang jianping LI Yaokun GUAN Xiaodan LIU Xiaoyue Key Laboratory for Semi-Arid Climate Change of the Ministry of Education College of Atmospheric SciencesLanzhou UniversityLanzhouChina College of Global Change and Earth System Science Beijing Normal UniversityBeijingChina

The relationship between vegetation greening and climate change remains unclear due to its complexity, especially in drylands. Against the background of global warming, arid and semi-arid areas, including mid-latitude deserts, are most sensitive to climate change. In recent decades, the mechanisms underlying the relationship between vegetation greening and climate change have been widely discussed in the literature. However, the influence of vegetation greening in high latitudes on regional climate has not been fully studied. In this paper, a two-dimensional energy balance model was used to study the influence of greening in high latitudes on mid-latitude deserts. The authors found that when greening occurs in high latitudes, the mid-latitude desert recedes at the south boundary, while the polar ice belt and low-latitude vegetation belt both expand. Simultaneously, greening in high latitudes can induce a negative temperature anomaly in northern latitudes and a positive temperature anomaly in southern latitudes. The mid-latitude desert expands at its north and south boundaries until the CO2 concentration reaches 600 ppm(saturated state). The greening in high latitudes could result in a lower global-mean temperature in the ‘saturated’ state, due to the stronger cooling in high latitudes.

关键词： High-latitude greening two-dimensional energy balance model mid-latitude desert remote effect global warming

Development and application of the mo-ment-ratio imaging algorithm

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2006年第5期19卷 569-580页

作者：黄建平马丽张晁军 Institute of Earthquake Sciences China Earthquake Administration Graduate University of Chinese Academy of Sciences Beijing 100049China

In the moment-ratio imaging algorithm, which is based on the theory of healing of a wound, the energy of each strong earthquake is distributed around the epicenter according to certain rules, and the features of the Moment-ratio value R are analyzed as the space and time change, so that the relationships between the moment-ration value R and strong earthquakes can be found. In the present paper, regions divided, hypocenter depths and events completed magnitude analyses were carried out in the Chinese catalogue. By applying the moment-ratio imaging algorithm in which the parameters are adjusted, the processes of anomaly evolution which correspond to the epicenter and the surrounding value R before earthquakes of M≥7.0 since 1966 in different areas of China were analyzed. It was found that the range area and imminent time of a coming earthquake could be confirmed quantita- tively by analyzing the abnormal temporal and spatial variation of the value R The results showed that the temporal and spatial variation of the value R could quantitatively reflect the temporal and spatial factors of a coming strong earthquake as well as the rule of medium rupture.

关键词： moment-ratio imaging algorithm healing, quantitative analysis China strong earthquakes

同方期刊数据库

Estimations of indirect and direct anthropogenic dust emissions at the global scale

在线全文

学校读者我要写书评

暂无评论

Estimations of indirect and direct anthropogenic dust emissi...

Estimation of ground heat flux and its impact on the surface energy budget for a semi-arid grassland

第35届中国气象学会年会

作者： Siyu Chen jianping huang Nanxuan Jiang Xiaorui Zhang Key Laboratory for Semi-Arid Climate Change of the Ministry of Education Lanzhou University

Dust emission is a key process in the dust cycle that determines long-term transport, dry/wet deposition, radiation forcing, and other dust-related processes at both regional and global scales. However, most dust emission schemes only consider natural dust, neglecting anthropogenic dust induced by human activities, which led to large uncertainties in quantitative estimations of dust emissions in numerical modeling. To fully consider the mechanisms of anthropogenic dust emissions, both "indirect" and "direct" anthropogenic dust emission schemes were constructed and developed in the study. Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations（CALIPSO） retrievals were used to constrain the simulations. The results showed that the schemes reasonably reproduced the spatio-temporal distributions of anthropogenic dust at the global scale from 2007 to 2010. The high centers of anthropogenic dust emission flux appeared in India, the east of China, North America, and Africa range from 0.9 to 11 μgms. Compared with natural dust emissions, indirect anthropogenic dust emissions have indistinctive seasonal variation, with differences less than 36.4 μgms. Pasturelands contribute higher anthropogenic dust emissions than croplands, with emissions of approximately 1.2 μgms, accounting for 65.3% of indirect anthropogenic dust emissions. Moreover, average anthropogenic dust emissions in urban areas have values approximately 3.5 μgms, which is higher than those in rural areas(approximately 1.3 μgms). This study demonstrates that the environmental problems caused by anthropogenic dust in urban areas cannot be ignored.

关键词： Anthropogenic dust Indirect anthropogenic dust emission Direct anthropogenic dust emission Dynamic land cover

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Research in Cold and Arid Regions 2011年第1期3卷 41-50页

作者： JinQing Zuo JieMin Wang jianping huang WeiJing Li GuoYin Wang HongLi Ren Key Laboratory for Semi-Arid Climate Change of the Ministry of Education College of Atmospheric Sciences Lanzhou University Lanzhou Gansu 730000 China Laboratory for Climate Studies China Meteorological Administration Beijing 100081 China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China

Three approaches, i.e., the harmonic analysis （HA） technique, the thermal diffusion equation and correction （TDEC） method, and the calorimetric method used to estimate ground heat flux, are evaluated by using observations from the Semi-Arid Climate and Environment Observatory of Lanzhou University （SACOL） in July, 2008. The calorimetric method, which involves soil heat flux measurement with an HFP01SC self-calibrating heat flux plate buried at a depth of 5 cm and heat storage in the soil between the plate and the surface, is here called the ITHP approach. The results show good linear relationships between the soil heat fluxes measured with the HFP01SC heat flux plate and those calculated with the HA technique and the TDEC method, respectively, at a depth of 5 cm. The soil heat fluxes calculated with the latter two methods well follow the phase measured with the HFP01SC heat flux plate. The magnitudes of the soil heat flux calculated with the HA technique and the TDEC method are close to each other, and they are about 2 percent and 6 percent larger than the measured soil heat flux, respectively, which mainly occur during the nighttime. Moreover, the ground heat fluxes calculated with the TDEC method and the HA technique are highly correlated with each other （R2= 0.97）, and their difference is only about 1 percent. The TDEC-calculated ground heat flux also has a good linear relationship with the ITttP-calculated ground heat flux （R2 = 0.99）, but their difference is larger （about 9 percent）. Furthermore, compared to the HFP01SC direct measurements at a depth of 5 cm, the ground heat flux calculated with the HA technique, the TDEC method, and the ITHP approach can improve the surface energy budget closure by about 6 percent, 7 percent, and 6 percent at SACOL site, respectively. Therefore, the contribution of ground heat flux to the surface energy budget is very important for the semi-arid grassland over the Loess Plateau in China. Using turbulent heat fluxes with common

关键词： soil heat flux harmonic analysis TDEC method self-calculating heat flux plate surface energy budget