检索结果-南通市图书馆

Evolvement of microwave spike bursts in a solar flare on 2006 December 13

Research in Astronomy and Astrophysics 2021年第6期21卷 359-368页

作者： jian-Fei Tang De-Jin Wu Jun-Lin Wan Ling chen cheng-Ming Tan Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Planetary Sciences Purple Mountain ObservatoryNanjing 210023China CAS Key Laboratory of Solar Activity National Astronomical ObservatoriesCASBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

Solar radio spikes are one of the most intriguing spectral types of radio *** very short lifetimes,small source size and super-high brightness temperature indicate that they should be involved in some strong energy release,particle acceleration and coherent emission processes closely related to solar *** particular,for the microwave spike bursts,their source regions are much close to the related flaring source region which may provide the fundamental information of the flaring *** this work,we identify more than 600 millisecond microwave spikes which recorded by the Solar Broadband Radio Spectrometer in Huairou(SBRS/Huairou)during an X3.4 solar flare on 2006 December 13 and present a statistical analysis about their parametric evolution *** find that the spikes have nearly the same probability of positive and negative frequency drifting rates not only in the flare rising phase,but also in the peak and decay *** we suppose that the microwave spike bursts should be generated by shockaccelerated energetic electrons,just like the terminational shock(TS)wave produced by the reconnection outflows near the loop *** spike bursts occurred around the peak phase have the highest central frequency and obviously weak emission intensity,which imply that their source region should have the lowest position with higher plasma density due to the weakened magnetic reconnection and the relaxation of TS during the peak *** right-handed polarization of the most spike bursts may be due to the TS lying on the top region of some very asymmetrical flare loops.

关键词： Sun:activity Sun:flares Sun:radio radiation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ecological and Economic System Health Assessment Based on Fuzzy Set Pair Analysis:A Case Study of Northwest Region,China

引用

Chinese Journal of Population,Resources and Environment 2012年第3期10卷 107-115页

作者： chen Junfei zhou Xiaolan Wang Huimin State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing Jiangsu 210098 China Business School Hohai University Nanjing Jiangsu 210098 China

Due to the increasingly serious environmental pollution and destruction,especially humans' unreasonable activities,the ecological and economic system(EES) issues of Northwest region in China have attracted more and more attention of the *** at evaluating its ecological and economic system health,a multi-objective evaluation framework called PressureState-Response(PSR) was established to describe the ecological and economic health ***,an integrative set pair model combining set pair analysis(SPA) and fuzzy analytic hierarchy process(FAHP) was proposed to assess the ecological and economic *** the EES status of five northwest provinces(Shanxi,Gansu,Qinghai,Ningxia and Xinjiang) of Northwest region in China was evaluated during 1985 to *** EES development trends of five provinces are *** general,the health values of five provinces showed a rising *** health values of five provinces grew rapidly during 1985 to *** 2000,the health values of five provinces still followed the present growth trend,but the growth is relatively *** results show that the method proposed is effective for assessing the health of ecological and economic system.

关键词： ecological and economic system (EES) health assess-ment fuzzy analytic hierarchy process (FAHP) set pair analysis(SPA) Pressure-State-Response (PSR)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Metabolic and proteostatic differences in quiescent and active neural stem cells

引用

Neural Regeneration Research 2024年第1期19卷 43-48页

作者： Jiacheng Yu Gang chen Hua Zhu Yi Zhong Zhenxing Yang Zhihong jian Xiaoxing Xiong Department of Neurosurgery Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Adult neural stem cells are neurogenesis progenitor cells that play an important role in ***,neural regeneration may be a promising target for treatment of many neurological *** regenerative capacity of adult neural stem cells can be chara cterized by two states:quiescent and *** adult neural stem cells are more stable and guarantee the quantity and quality of the adult neural stem cell *** adult neural stem cells are chara cterized by rapid proliferation and differentiation into neurons which allow for integration into neural *** review focuses on diffe rences between quiescent and active adult neural stem cells in nutrition metabolism and protein ***,we discuss the physiological significance and underlying advantages of these diffe *** to the limited number of adult neural stem cells studies,we refe rred to studies of embryonic adult neural stem cells or non-mammalian adult neural stem cells to evaluate specific mechanisms.

关键词： adult neurogenesis cell metabolic pathway cellular proliferation neural stem cell niches neural stem cells neuronal differentiation nutrient sensing pathway proteostasis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Exploration of the oxidative-inflammatory potential targets of Coicis Semen in osteoarthritis:Data mining and systematic pharmacology

引用

BIOCELL 2023年第7期47卷 1623-1643页

作者： QIAO zhou jian LIU LING XIN YANYAN FANG LEI WAN DAN HUANG jianTING WEN Department of Rheumatism Immunity The First Affiliated HospitalAnhui University of Chinese MedicineHefei230031China Institute of Rheumatism Prevention and Treatment of Traditional Chinese Medicine Anhui Academy of Chinese Medicine SciencesHefei230031China Graduate School Anhui University of Chinese MedicineHefei230012China Department of Rheumatism Immunity The Second Affiliated HospitalAnhui University of Chinese MedicineHefei230061China

On the basis of data mining,systematic pharmacology,molecular docking,and experiment validation,the oxidative-inflammatory molecular targets of Coicis Semen in the therapy of osteoarthritis(OA)were ***:The association rule analysis was effectively applied to highlight the correlation between Coicis Semen and oxidative inflammation *** random walk model was subsequently used to evaluate the clinical efficacy of Coicis *** pharmacology was used to predict network *** binding affinity of the active ingredient in Coicis Semen to the key target of OA was also successfully ***:Coicis Semen showed a significant reduction in oxidative-inflammatory indicators of OA.A total of 108 promising targets were predicted for the 24 bioactive compounds in Coicis *** target genes were considered core target *** enrichment analysis predicts that Coicis Semen may activate the interleukin(IL)-17,mitogen-activated protein kinase(MAPK),and nuclear factor kappa B(NF-kappa B)signaling *** docking demonstrated that stigmasterol,2-monoolein,sitosterol,and sitosterol alpha1 had free binding energies to oxidative and inflammatory targets(MAPK1,Estrogen Receptor 1[ESR1],and Peroxisome Proliferator-Activated Receptor Alpha[PPARA]).Both clinical trials and in vitro cell experiments revealed that Coicis Semen could increase ESR1 and PPAR-αlevels while decreasing MAPK1 ***:Coicis Semen has a remarkable anti-OA ***,the major components of Coicis Semen,including stigmasterol,sitosterol alpha1,sitosterol,and 2-monoolein,specifically inhibit MAPK1,ESR1,and PPARA to reduce the inflammatory response and oxidative damage in OA.

关键词： Pharmacologic actions Chinese herbal medicine Osteoarthritis Random walk model Molecular docking

来源：

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

The CMIP6 Historical Simulation Datasets Produced by the Climate System Model CAMS-CSM

引用

Advances in Atmospheric Sciences 2021年第2期38卷 285-295页

作者： Xinyao RONG jian LI Haoming chen Jingzhi SU Lijuan HUA Zhengqiu ZHANG Yufei XIN State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China

This paper describes the historical simulations produced by the Chinese Academy of Meteorological Sciences(CAMS)climate system model(CAMS-CSM),which are contributing to phase 6 of the Coupled Model Intercomparison Project(CMIP6).The model description,experiment design and model outputs are *** members’historical experiments are conducted by CAMS-CSM,with two members starting from different initial conditions,and one excluding the stratospheric aerosol to identify the effect of volcanic *** outputs of the historical experiments are also validated using observational *** is found that the model can reproduce the climatological mean states and seasonal cycle of the major climate system quantities,including the surface air temperature,precipitation,and the equatorial *** long-term trend of air temperature and precipitation is also reasonably captured by *** are still some biases in the model that need further *** paper can help the users to better understand the performance and the datasets of CAMS-CSM.

关键词： CMIP6 historical simulation CAMS-CSM climate system model data description

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Online Probabilistic Assessment of Operating Safety for Multi-mode Engineering Systems based on Bayesian methods

Online Probabilistic Assessment of Operating Safety for Mult...

引用

第25届中国控制与决策会议

作者： Yufei Lin Maoyin chen Donghua zhou Department of Automation Tsinghua University

ISBN: (纸本)9781467355339

Operating safety has become more and more important in today’s engineering systems, since the systems become more and more complex. And it is crucial to develop strategies for online operating safety assessment. Although there have been some studies and researches on operating safety assessment, online assessment has not yet been paid sufficient attention, especially for multi-mode engineering systems. This paper proposes a probabilistic framework of online operating safety assessment for multi-mode engineering systems. First, a Gaussian mixture model （GMM） is used to characterize multiple operating modes. Then, based on a kind of definition of safety index （SI）, the SI for one single mode is calculated. A Bayesian method is then presented to calculate the posterior probabilities belonging to each operating mode with consideration of sample dependency.

关键词： Safety assessment Multi-mode engineering systems Bayesian method

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

Evaluation of Reprocessed Fengyun-3B Global Outgoing Longwave Radiation Data:Comparison with CERES OLR

引用

Journal of Meteorological Research 2022年第3期36卷 417-428页

作者： Wanchun ZHANG jian LIU Peng ZHANG Ling SUN Hanlie XU Yanjiao WANG Lin chen Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological CenterChina Meteorological AdministrationBeijing 100081 Fengyun Meteorological Satellite Innovation Center China Meteorological AdministrationBeijing 100081 National Climate Center China Meteorological AdministrationBeijing 100081

Outgoing longwave radiation(OLR)at the top of the atmosphere(TOA)is a key parameter for understanding and interpreting the relationship between clouds,radiation,and climate *** has been one of the operational products of the Fengyun(FY)meteorological *** accuracy has gradually improved with advancements in satellite payload performance and the OLR retrieval *** by the National Key R&D Program Retrospective Calibration of Historical Chinese Earth Observation Satellite data(Richceos)project,a long-term OLR climate data record(CDR)was reprocessed based on the recalibrated Level 1 data of FY series satellites using the latest OLR retrieval *** this study,Fengyun-3B(FY-3B)’s reprocessed global OLR data from 2010 to 2018 were evaluated by using the Clouds and the Earth’s Radiant Energy System(CERES)global daily OLR *** results showed that there was a high consistency between the FY-3B instantaneous OLR and CERES Single Scanner Footprint(SSF)***,between the two CDR datasets,the correlation coefficient reached 0.98,and the rootmean-square error(RMSE)was approximately 8-9 W m^(−2).The bias mainly came from the edge regions of the satellite orbit,which may be related to the satellite zenith angle and cloud cover *** was shown that the longterm FY-3B OLR had temporal stability compared to CERES OLR long-term *** terms of spatial distribution,the mean deviations showed zonal and seasonal characteristics,although seasonal fluctuations were observed in the differences between the two *** of FY-3B OLR application to the South China Sea monsoon region and ENSO were demonstrated and analyzed,and the results showed that the seasonal deviation of FY-3B’s OLR comes mainly from the retrieval ***,it has little effect on the analysis of climate events.

关键词： Fengyun-3B(FY-3B) Clouds and the Earth’s Radiant Energy System(CERES) outgoing longwave radiation(OLR) South China Sea monsoon El Niño-Southern Oscillation(ENSO)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Current Situation, Development, and Prospects of the Iron and Steel Industry in the Process towards the “Dual Carbon” Goals

引用

Chinese Journal of Urban and Environmental Studies 2023年第2期11卷 44-55页

作者： WEI Wei zhou Dianmin chen Zhaohui Baowu Clean Energy Co. Ltd.

The iron and steel industry is the largest carbon emitter in China’s manufacturing sector and one of the most important fields in the country’s response to climate change. This paper aims to explain the current situation, technological pathways, and future direction of green and lowcarbon development of the iron and steel industry. According to the carbon emissions of the iron and steel industry, this paper analyzes the relationship between steelmaking technologies and carbon emissions, as well as the transformation trend of the world’s iron and steel industry,finding that China’s iron and steel industry faces both opportunities and challenges. Steel scrap recycling and electric furnace steelmaking technologies, re-electrification, hydrogen metallurgy,resource recycling and by-products, and carbon capture and utilization(CCU) are the main technologies tailored to the transformation pathways, and the optimization of energy consumption structure is an important direction for future development. Therefore, this paper believes that clean energy, as a guarantee for carbon mitigation, will play an increasingly important role in the process towards achieving carbon peaking and carbon neutrality goals(the “dual carbon” goals),in addition to the transformation of metallurgical technologies.

关键词： Iron and steel industry carbon peaking carbon neutrality green development

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Linear and Nonlinear Optical Properties of Micrometer-Scale Gold Nanoplates

引用

Chinese Physics Letters 2011年第5期28卷 263-266页

作者： LIU Xiao-Lan PENG Xiao-Niu YANG Zhong-jian LI Min zhou Li Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072

Micrometer-scale gold nanoplates have been synthesized in high yield through a polyol *** morphology,crystal structure and linear optical extinction of the gold nanoplates have been *** gold nanoplates are single-crystalline with triangular,truncated triangular and hexagonal shapes,exhibiting strong surface plasmon resonance(SPR)extinction in the visible and near-infrared(NIR)*** linear optical properties of gold nanoplates are also investigated by theoretical *** further investigate the nonlinear optical properties of the gold nanoplates in solution by Z-scan *** nonlinear absorption(NLA)coefficient and nonlinear refraction(NLR)index are measured to be 1.18×10^(2)cm/GW and-1.04×10^(-3)cm^(2)/GW,respectively.

关键词： process plates extinction

来源：

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

Multi-scale Incremental Analysis Update Scheme and Its Application to Typhoon Mangkhut(2018)Prediction

引用

Advances in Atmospheric Sciences 2023年第1期40卷 95-109页

作者： Yan GAO Jiali FENG Xin XIA jian SUN Yulong MA Dongmei chen Qilin WAN Guangdong-Hong Kong-Macao Greater Bay Area Weather Research Center for Monitoring Warning and Forecasting Shenzhen 518038China CMA Earth System Modeling and Prediction Centre China Meteorological AdministrationBeijing 100081China

In the traditional incremental analysis update(IAU)process,all analysis increments are treated as constant forcing in a model’s prognostic equations over a certain time *** approach effectively reduces high-frequency oscillations introduced by data ***,as different scales of increments have unique evolutionary speeds and life histories in a numerical model,the traditional IAU scheme cannot fully meet the requirements of short-term forecasting for the damping of high-frequency noise and may even cause systematic ***,a multi-scale IAU scheme is proposed in this *** increments were divided into different scale parts using a spatial filtering *** each scale increment,the optimal relaxation time in the IAU scheme was determined by the skill of the forecasting ***,different scales of analysis increments were added to the model integration during their optimal relaxation *** multi-scale IAU scheme can effectively reduce the noise and further improve the balance between large-scale and small-scale increments in the model initialization *** evaluate its performance,several numerical experiments were conducted to simulate the path and intensity of Typhoon Mangkhut(2018)and showed that:(1)the multi-scale IAU scheme had an obvious effect on noise control at the initial stage of data assimilation;(2)the optimal relaxation time for large-scale and small-scale increments was estimated as 6 h and 3 h,respectively;(3)the forecast performance of the multi-scale IAU scheme in the prediction of Typhoon Mangkhut(2018)was better than that of the traditional IAU *** results demonstrate the superiority of the multi-scale IAU scheme.

关键词： multi-scale incremental analysis updates optimal relaxation time 2-D discrete cosine transform GRAPES_Meso Typhoon Mangkhut(2018)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：