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Special Issue on "Response of Polar Organisms and Natural Environment to Global Changes"
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《Advances in Polar Science》 2016年第2期138-138,共1页
High altitude and high latitude regions on Earth are experiencing rapid changes in climate, with impacts on polar organisms and the environment. The persistent cold and sometimes inhospitable conditions create unique ... High altitude and high latitude regions on Earth are experiencing rapid changes in climate, with impacts on polar organisms and the environment. The persistent cold and sometimes inhospitable conditions create unique ecosystems and habitats for polar organisms. 展开更多
关键词 Special Issue on Response of Polar Organisms and natural Environment to Global Changes
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Inviting Contributions to a Special Issue on "Response of Polar Organisms and Natural Environment to Global Changes"
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《Advances in Polar Science》 2016年第2期138-138,共1页
Dear Colleagues, We would like to invite you to submit manuscripts to a special issue of the journal Advances in Polar Science (APS) on "Response of Polar Organisms and Natural Environment to Global Changes".
关键词 Response of Polar Organisms and natural Environment to Global Changes Inviting Contributions to a Special Issue on
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Soil Organic Carbon Contents and Stocks in Coastal Salt Marshes with Spartina alterniflora Following an Invasion Chronosequence in the Yellow River Delta,China 被引量:9
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作者 ZHANG Guangliang BAI Junhong +4 位作者 JIA Jia WANG Xin WANG Wei ZHAO Qingqing ZHANG Shuai 《Chinese Geographical Science》 SCIE CSCD 2018年第3期374-385,共12页
Plant invasion alters the fundamental structure and function of native ecosystems by affecting the biogeochemical pools and fluxes of materials and energy. Native(Suaeda salsa) and invasive(Spartina alterniflora) salt... Plant invasion alters the fundamental structure and function of native ecosystems by affecting the biogeochemical pools and fluxes of materials and energy. Native(Suaeda salsa) and invasive(Spartina alterniflora) salt marshes were selected to study the effects of Spartina alterniflora invasion on soil organic carbon(SOC) contents and stocks in the Yellow River Delta. Results showed that the SOC contents(g/kg) and stocks(kg/m^2) were significantly increased(P < 0.05) after Spartina alterniflora invasion of seven years, especially for the surface soil layer(0–20 cm). The SOC contents exhibited an even distribution along the soil profiles in native salt marshes, while the SOC contents were gradually decreased with depth after Spartina alterniflora invasion of seven years. The natural ln response ratios(Ln RR) were applied to identify the effects of short-term Spartina alterniflora invasion on the SOC stocks. We also found that Spartina alterniflora invasion might cause soil organic carbon losses in a short-term phase(2–4 years in this study) due to the negative Ln RR values, especially for 20–60 cm depth. And the SOCD in surface layer(0–20 cm) do not increase linearly with the invasive age. Spearman correlation analysis revealed that silt + clay content was exponentially related with SOC in surface layer(Adjusted R^2 = 0.43, P < 0.001), suggesting that soil texture could play a key role in SOC sequestration of coastal salt marshes. 展开更多
关键词 plant invasion soil organic carbon salt marshes Spartina alterniflora natural ln response ratios(LnRR) the Yellow River Delta
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AN APPROXIMATE METHOD OF RESPONSE ANALYSIS OFVIBRATIONS FOR CRACKED BEAMS
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作者 陈梦成 汤任基 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1997年第3期221-228,共8页
In this paper a method based on a line-spring model was proposed to analyze approximately vibration responses of cracked beams. The method is conjunction with the Euler-Bernoulli beam theory, modal analysis and fractu... In this paper a method based on a line-spring model was proposed to analyze approximately vibration responses of cracked beams. The method is conjunction with the Euler-Bernoulli beam theory, modal analysis and fracture mechanics principle was applied to derive a characteristic equation for the cracked beam vibration. As application examples, natural frequency responses for a cracked hinged-hinged beam and a cracked cantilever beam were examined. It was shown that the present solutions obtained are quite in agreement with the solutions or experimental results in available references. 展开更多
关键词 cracked beam line-spring model response of natural frequency
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Quantitative Method of the Structural Damage Identification of Gas Explosion Based on Case Study:The Shanxi “11. 23” Explosion Investigation
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作者 Huanjuan Zhao Yiran Yan Xinming Qian 《Journal of Beijing Institute of Technology》 EI CAS 2018年第1期1-14,共14页
In order to present a retrospective analysis of exposition accidents using input data from investigation processes,data from a specific accident was examined,in which we analyzed possible involved gas species( liquef... In order to present a retrospective analysis of exposition accidents using input data from investigation processes,data from a specific accident was examined,in which we analyzed possible involved gas species( liquefied petroleum gas; nature gas) and computed their concentrations and distributions based on the interactions between the structures and the effects of the explosion. In this study,5 scenarios were created to analyze the impact effect. Moreover,a coupling algorithm was put into practice,with a practical outflow boundary and joint strength are applied. Finally,the damage effects of each scenario were simulated. Our experimental results showed significant differences in the 5 scenarios concerning the damage effects on the building structures. The results from scenario 3 agree with the accident characteristics,demonstrating the effectiveness of our proposed modeling method. Our proposed method reflects gas properties,species and the concentration and distribution,and the simulated results validates the root cause,process,and consequences of accidental explosions. Furthermore,this method describes the evolution process of explosions in different building structures. Significantly,our model demonstrates the quantatative explosion effect of factors like gas species,gas volumes,and distributions of gases on explosion results. In this study,a feasible,effective,and quantitative method for structure safety is defined,which is helpful to accelerate the development of safer site regulations. 展开更多
关键词 mechanics of explosion simulation dynamic response liquefied petroleum gas nature gas quantitative analysis
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A Small “Think Tank” Integrating Foresight,Innovation,and Practicability: A Review on Practice and Reflections on Local Governments' Response to Major Natural Disasters
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作者 Zhou Fayuan Li Caige(译) Tang Yan(校) 《China City Planning Review》 CSCD 2017年第4期75-77,共3页
Practice and Reflections on Local Governments’Response to Major Natural Disasters Authors:He Zhen et al.Year:2014Publisher:People’s Publishing House ISBN:9787010137049(478 pages,in Chinese)China is a countr y with f... Practice and Reflections on Local Governments’Response to Major Natural Disasters Authors:He Zhen et al.Year:2014Publisher:People’s Publishing House ISBN:9787010137049(478 pages,in Chinese)China is a countr y with frequent occur rence of major natural disasters.Especially since the 21st century,natural disasters。 展开更多
关键词 A Review on Practice and Reflections on Local Governments A Small Response to Major natural Disasters Think Tank
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Time domain finite volume method for the transient response and natural characteristics of structural-acoustic coupling in an enclosed cavity
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作者 XUAN Lingkuan MING Pingjian +2 位作者 ZHANG Wenping JIN Guoyong GONG Jingfeng 《Chinese Journal of Acoustics》 2014年第3期212-227,共16页
A time domain finite volume method(TDFVM)based on wave theory is developed to analyze the transient response and natural characteristics of structural-acoustic coupling problems in an enclosed cavity.In the present ... A time domain finite volume method(TDFVM)based on wave theory is developed to analyze the transient response and natural characteristics of structural-acoustic coupling problems in an enclosed cavity.In the present method,the elastic dynamic equations and acoustic equation in heterogeneous medium are solved in solid domains and fluid domains respectively.The structural-acoustic coupling is implemented according to the continuity condition of the particle velocity along the normal direction and the normal traction equilibrium condition on the interface.Several numerical examples are presented to validate the effectiveness and accuracy of the present TDFVM.Then the effects of water depth on the acoustic and vibration characteristics and the natural characteristics of a structural-acoustic coupling system are analyzed.The numerical results show that the increase of water depth leads to a stronger coupling between the water and structure and the decrease of natural frequencies of coupling system,The computational cost and memory of this method are small and it can be applicable to structural-acoustic coupling problems in the heterogeneous fluid. 展开更多
关键词 Time domain finite volume method for the transient response and natural characteristics of structural-acoustic coupling in an enclosed cavity
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CHINA'S EMERGENCY RESPONSE SYSTEM FOR NATURAL DISASTERS
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作者 李吉顺 《Natural Disaster Reduction in China》 1994年第3期127-130,共4页
CHINA'SEMERGENCYRESPONSESYSTEMFORNATURALDISASTERSLiJishun(李吉顺)(officeofChinaNationalCommitteeforfoeIDNDR)Whi... CHINA'SEMERGENCYRESPONSESYSTEMFORNATURALDISASTERSLiJishun(李吉顺)(officeofChinaNationalCommitteeforfoeIDNDR)Whilefollowingthepri... 展开更多
关键词 李吉 CHINA’S EMERGENCY RESPONSE SYSTEM FOR natural DISASTERS
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