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Development characteristics and failure modes of reactivated ancient landslides in the Sichuan–Tibet transportation corridor,China

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Journal of Mountain Science 2023年第12期20卷 3596-3613页

作者： WU Rui-an ZHANG Yong-shuang guo chang-bao REN San-shao YAO Xin LIU Xiao-yi YANG Zhi-hua DU guo-liang Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesBeijing 100081China China University of Geosciences Beijing 100083China China Aero Geophysical Survey and Remote Sensing Center for Natural Resources Beijing 100083China School of Urban Geology and Engineering Hebei GEO UniversityShijiazhuang 050031China

The risk of reactivated ancient landslides in the Sichuan–Tibet transportation corridor in China is significantly increasing,primarily driven by the intensification of engineering activities and the increased frequency of extreme weather *** escalation has resulted in a considerable number of fatalities and extensive damage to critical engineering ***,the factors contributing to the reactivation and modes of destruction of ancient landslides remain ***,it is imperative to systematically analyze the developmental characteristics and failure modes of reactivated ancient landslides to effectively mitigate disaster *** on a combination of data collection,remote sensing interpretation,and field investigations,we delineated the developmental attributes of typical ancient landslides within the study *** attributes encompass morphological and topographic aspects,material composition,and spatial structure of ancient ***,we identified the key triggers for the reactivation of ancient landslides,including water infiltration,reservoir hydrodynamics,slope erosion,and excavation,by analyzing representative cases in the study *** of ancient landslides is sometimes the result of the cumulative effects of multiple predisposing ***,our investigations revealed that the reactivation of these ancient landslides primarily led to local ***,over extended periods of dynamic action,the entire zone may experience gradual *** categorized the reactivation modes of ancient landslides into three distinct types based on the reactivation sequences:progressive retreat,backward thrusting,and forward pulling–backward *** study is of great significance for us to identify ancient landslides,deepen our understanding of the failure modes and risks of reactivated ancient landslides on the eastern margin of the Tibetan Plateau,and formulate effective disaster prevention and m

关键词： Ancient landslide Reactivation characteristic Triggering factor Failure mode Sichuan-Tibet transportation corridor Eastern Tibetan Plateau

Mechanical Modeling and Analysis of Stability Deterioration of Production Well During Marine Hydrate Depressurization Production

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China Ocean Engineering 2024年第2期38卷 338-351页

作者： SUN Huan-zhao chang Yuan-jiang SUN bao-jiang WANG Kang CHEN guo-ming LI Hao DAI Yong-guo Centre for Offshore Engineering and Safety Technology China University of Petroleum(East China)Qingdao 266580China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Jiangsu Shuguang Oil Tools Co. LtdTaizhou 225532China

Different from oil and gas production,hydrate reservoirs are shallow and unconsolidated,whose mechanical properties deteriorate with hydrate ***,the formations will undergo significant subsidence during depressurization,which will destroy the original force state of the production ***,existing research on the stability of oil and gas production wells assumes the formation to be stable,and lacks consideration of the force exerted on the hydrate production well by formation subsidence caused by hydrate decomposition during *** fill this gap,this paper proposes an analytical method for the dynamic evolution of the stability of hydrate production well considering the effects of hydrate *** on the mechanical model of the production well,the basis for stability analysis has been proposed.A multi-field coupling model of the force state of the production well considering the effect of hydrate decomposition and formation subsidence is established,and a solver is *** analytical approach is verified by its good agreement with the results from the numerical method.A case study found that the decomposition of hydrate will increase the pulling-down force and reduce the supporting force,which is the main reason for the stability *** higher the initial hydrate saturation,the larger the reservoir thickness,and the lower the production pressure,the worse the stability or even *** work can provide a theoretical reference for the stability maintaining of the production well.

关键词： natural gas hydrate production well depressurization production formation deformation stability deterioration

Fullerenes and derivatives as electrocatalysts: Promises and challenges

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Green Energy & Environment 2024年第1期9卷 7-27页

作者： Kun guo Ning Li Lipiao bao Xing Lu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

Carbon-based metal-free nanomaterials are promising alternatives to precious metals as electrocatalysts of key energy storage and conversion *** paramount signiﬁcance are the establishment of design principles by understanding the catalytic mechanisms and identifying the active *** from sp2-conjugated graphene and carbon nanotube,fullerene possesses unique characteristics that are growingly being discovered and exploited by the electrocatalysis *** instance,the well-deﬁned atomic and molecular structures,the good electron afﬁnity to tune the electronic structures of other substances,the intermolecular self-assembly into superlattices,and the on-demand chemical modiﬁcation have endowed fullerene with incomparable advantages as electrocatalysts that are otherwise not applicable to other carbon *** increasing studies are being reported on this intriguing topic,it is necessary to provide a state-of-the-art overview of the recent *** review takes such an initiative by summarizing the promises and challenges in the electrocatalytic applications of fullerene and its *** content is structured according to the composition and structure of fullerene,including intact fullerene(e.g.,fullerene composite and superlattices)and fullerene derivatives(e.g.,doped,endohedral,and disintegrated fullerene).The synthesis,characterization,catalytic mechanisms,and deﬁciencies of these fullerene-based materials are explicitly *** conclude it by sharing our perspectives on the key aspects that future efforts shall consider.

关键词： Fullerene Fullerene derivative Metal-free catalyst Structural defect Electrocatalyst

An Online Q-Learning Method for Linear-Quadratic Nonzero-Sum Stochastic Differential Games with Completely Unknown Dynamics

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Journal of Systems Science & Complexity 2024年第5期37卷 1907-1922页

作者： ZHANG bao-Qiang WANG Bing-chang CAO Ying School of Control Science and Engineering Shandong University

In this paper, the authors design a reinforcement learning algorithm to solve the adaptive linear-quadratic stochastic n-players non-zero sum differential game with completely unknown dynamics. For each player, a critic network is used to estimate the Q-function, and an actor network is used to estimate the control input. A model-free online Q-learning algorithm is obtained for solving this kind of problems. It is proved that under some mild conditions the system state and weight estimation errors can be uniformly ultimately bounded. A simulation with five players is given to verify the effectiveness of the algorithm.

关键词： Actor-critic algorithm model-free adaptive control nonzero-sum stochastic game reinforcement learning

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近代文化视域中的鲁迅思想解读

山东社会科学 2010年第8期 43-45,58页

作者：郭长保天津师范大学文学院天津300387

鲁迅思想的形成有着极为深远的近代文化和思想背景,可是长期以来我们并没有把它放在近代文化背景中考察,而往往是置于"五四"新文化的背景下去审视,明显形成了理解鲁迅的文化误区,这是造成误读鲁迅的主要原因之一,也是造成今天的读者难... 详细信息

鲁迅思想的形成有着极为深远的近代文化和思想背景,可是长期以来我们并没有把它放在近代文化背景中考察,而往往是置于"五四"新文化的背景下去审视,明显形成了理解鲁迅的文化误区,这是造成误读鲁迅的主要原因之一,也是造成今天的读者难以读懂他的作品的主要因素,即使鲁迅同时代的许多知识分子也经常因为对鲁迅的误读而产生了对其思想的不理解。所有这些因素,增加了鲁迅本人的"孤独感"和"寂寞心态"。我们要想真正解读鲁迅,就须把他的思想置于近代文化视野中去透视。而其在新文化启蒙背景中的文学作品又恰恰是对他早年留日时期形成的近代"忧患"理念的形象诠释。

关键词：鲁迅误读近代性形象诠释

New process for treating boron-bearing iron ore by flash reduction coupled with magnetic separation

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 473-484页

作者： Qipeng bao Lei guo Hong Yong Sohn Haibin Zuo Feng Liu Yongliang Gao Zhancheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Department of Materials Science&Engineering University of UtahUtah 84112USA China ENFI Engineering Corporation Beijing 100038China

Boron is an important industrial raw material often sourced from minerals containing different compounds that cocrystallize,which makes it difficult to separate the mineral phases through conventional *** study proposed a new treatment called flash reduction-melting separation(FRMS)for boron-bearing iron *** this method,the concentrates were first flash-reduced at the temperature under which the particles melt,and the slag and the reduced iron phases disengaged at the particle *** reduc-tion and melting effects were achieved above 1550℃.The B_(2)O_(3) content in the separated slag was over 18wt%,and the B content in the iron was less than 0.03wt%.The proposed FRMS method was tested to investigate the effects of factors such as ore particle size and tem-perature on the reduction and melting steps with and without pre-reducing the raw *** mineral phase transformation and morphology evolution in the ore particles during FRMS were also comprehensively analyzed.

关键词： ludwigite boron-bearing iron concentrate flash reduction melting separation boron

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论《尚书》诰体的文化背景

北京师范大学学报（社会科学版） 2008年第4期 38-44页

作者：过常宝北京师范大学文学院北京100875

《尚书》六体皆与宗教仪式有关。"诰"并非仅仅产生于册命仪式,它实际上是各类宗庙祭仪中主祭者假祖先之名义而发的训诫辞。周初主祭者具有神性身份,诰辞中的"王若曰"就是其具有神性特征的标志;而"小子"是宗庙祭仪中特有的称谓,也能说明... 详细信息

《尚书》六体皆与宗教仪式有关。"诰"并非仅仅产生于册命仪式,它实际上是各类宗庙祭仪中主祭者假祖先之名义而发的训诫辞。周初主祭者具有神性身份,诰辞中的"王若曰"就是其具有神性特征的标志;而"小子"是宗庙祭仪中特有的称谓,也能说明主祭者处于祖神代言人的地位。周公是西周初期的宗教领袖,他凭借神性身份摄政称王,并利用宗教的形式进行政治文化变革,即神道设教。"诰"即周公在宗庙仪式中以祖先之名阐发礼乐政治思想而保存下来的文本。

关键词：尚书诰祭祖仪式神道设教

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论先秦“辞”的演变及特征

北京师范大学学报（社会科学版） 2015年第5期 50-57页

作者：过常宝北京师范大学文学院北京100875

先秦"辞"是一种独特的语言、文体、文化现象。西周中期,"辞"从综合性的宗教行为中分化出来,指祭祀仪式中的言语,有着程式化、规范化的特点。最为典型的就是"六祝之辞",它是太祝沟通鬼神的专业性语言。此外,太祝另有"六辞",假借神意对人... 详细信息

先秦"辞"是一种独特的语言、文体、文化现象。西周中期,"辞"从综合性的宗教行为中分化出来,指祭祀仪式中的言语,有着程式化、规范化的特点。最为典型的就是"六祝之辞",它是太祝沟通鬼神的专业性语言。此外,太祝另有"六辞",假借神意对人进行教诫,体现了周公神道设教文化改革的成果。春秋时期,通过任何方式与礼仪传统相联系,并具有教诫意义的话都被称为"辞","有辞"或"辞顺"成为一种新的社会价值。春秋"有辞"观念和君子"立言"的思潮紧密相关,是大夫阶层主体意识的体现。孔子认为"辞"的特征为"文"。"文"指的是"辞"与传统仪式的关联性表征,如韵文、程式化的结构、特殊用语、"信而有征"的话语方式、仪式性场合等。而"诚"和"巧"是从情感和美学两个方面对"辞"的总体要求。

关键词：辞祭辞教辞有辞文

Confluence of asymmetric catalysis and electrosynthesis in sustainable chemical transformations

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Science China Chemistry 2024年第3期67卷 755-758页

作者： Qinglin Zhang Kang Liang chang guo Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of ChinaHefei 230026China

Electrosynthesis has gained widespread recognition for its extraordinary ability to precisely control the redox *** outstanding capability enables the direct conversion of non-functionalized substrates into reactive intermediates by utilizing easily accessible starting materials, eliminating the need for preliminary functionalization procedures and allowing for unconventional bond activations.

关键词： Confluence of asymmetric catalysis and electrosynthesis in sustainable chemical transformations