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Striving for Carbon Dioxide Peaking and Carbon Neutrality

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Qiu Shi 2022年第3期14卷 43-49页

作者： Wang Jinnan cai bofeng the Chinese Academy of Engineering the Chinese Academy of Enuironmental Planning(CAEP) the Centerfor Research on the Carbon Peak and Carbon Neutrality the Ministry of Ecology and Enuironment

At the Central Economic Work Conference held from December 8 to 10,2021,Presidet Xi Jinping emphasized the need to get to grips with bringing carbon emissions to a peak before 2030 and achieving carbon neutrality before 2060(dual carbon goals,hereafter).This carefully formulated strategy of the Central Committee of the Communist Party of China(CPC)represents a solemn commitment to the international community and is a requirement for China's high-quality development.

关键词： bringing hereafter Carbon

Study on carbon emission in prefecture-level cities of china

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High Technology Letters 2012年第1期18卷 101-106页

作者： Feng Ying cai bofeng Institute of Scientific and Technical Information of China Beijing 100038 P.R. China College of Environmental Sciences and Engineering Peking University Beijing 100871 P.R. China Center for Climate and Environmental Policy Chinese Academy for Environmental Planning Beijing 100012 P.R. China

The study on greenhouse gas inventory in urban China lags far behind the global level. The important factor that curbs the carbon inventory of cities of China is inventory methodology and scope. Given the insufficiency of Chinese cities carbon inventory, a system and accounting model (scope1+ scope2) as well as principles and boundaries were proposed for China. The carbon emissions in scope1 and scope1+ scope2 were calculated in Chinese prefecture-level cities. The EDGAR dataset was used for the calculation of scope1 carbon emissions in cities in China and the level of uncertainty was analyzed as well. The results showed that the direct carbon emission of cities in China was about 31.65% of China total emissions. The scope1+ scope2 carbon emissions in cities of China were calculated based on the GIS and RS model. The results showed that the sum of direct (scope1) and indirect (scope2) carbon emissions of cities in China accounted for 38.80% of total China carbon emissions. © by HIGH TECHNOLOGY LETTERS PRESS.

关键词：中国城市碳排放量地级温室气体会计核算不确定性计算 S模型

Decomposition Analysis of Sectoral Energy Use in Beijing (1981-2005) Using the LMDI Method

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Chinese Journal of Population,Resources and Environment 2008年第2期6卷 49-54页

作者： Liu Chunlan Xie Gaodi cai bofeng Beijing Municipal Research Institute of Environmental Protection Beijing 100037 China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China 不详

This paper aims to identify the main driving force for changes of total primary energy consumption in Beijing during the period of 1981-2005.Sectoral energy use was investigated when regional economic structure changed significantly.The changes of total primary energy consumption in Beijing are decomposed into production effects,structural effects and intensity effects using the additive version of the logarithmic mean Divisia index (LMDI) method.Aggregate decomposition analysis showed that the major contributor of total effect was made by the production effect fol- lowed by the intensity effect,and the structural effect was rela- tively insignificant.The total and production effects were all posi- tive.In contrast,the structural effect and intensity effect were all negative.Sectoral decomposition investigation indicated that the most effective way to slow down the growth rate of total primary energy consumption (TPEC) was to reduce the production of the energy-intensive industrial sectors and improving industrial en- ergy intensity.The results show that in this period,Beijing's economy has undergone a transformation from an industrial to a service economy.However,the structures of sectoral energy use have not been changed yet,and energy demand should be in- creasing until the energy-intensive industrial production to be reduced and energy intensity of the region reaches a peak.As sequence energy consumption data of sub-sectors are not available, only the fundamental three sectors are considered:agriculture, industry and service.However,further decomposition into secon- dary and tertiary sectors is definitely needed for detailed investi- gations.

关键词：北京能源消耗能源管理经济结构

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基于锥角控制的下风向风力机功率调节策略

东南大学学报（自然科学版） 2024年第3期54卷 747-753页

作者：许波峰石腾李振肖航马远卓蔡新河海大学可再生能源发电技术教育部工程研究中心南京211100 河海大学江苏省风电机组结构工程研究中心南京211100 河海大学苏州研究院苏州215100 中国船舶集团海装风电股份有限公司重庆401123

针对中小型下风向风力机开展了功率调节策略研究.首先,对100 W下风向风力机进行了仿真计算和风洞实验,探究了下风向风力机的气动性能;然后,分析了风轮锥角对风力机输出功率和叶根载荷的影响机制,归纳出输出功率与锥角余弦值的三次方正相... 详细信息

针对中小型下风向风力机开展了功率调节策略研究.首先,对100 W下风向风力机进行了仿真计算和风洞实验,探究了下风向风力机的气动性能;然后,分析了风轮锥角对风力机输出功率和叶根载荷的影响机制,归纳出输出功率与锥角余弦值的三次方正相关,叶根载荷与锥角余弦值的平方正相关;最后,形成了一套基于锥角控制的下风向风力机功率主/被动调节策略.研究结果表明:采用主动调节策略可在超额定风速运行时有效控制风轮输出功率,并可使叶根载荷极值降低14.2%;较控制前,采用被动调节策略可使得在超额定风速运行时,输出功率与额定功率的平均偏差减小20.84 W.两种调节策略皆可实现超额定风速运行时下风向风力机输出功率的有效控制.

关键词：下风向风力机气动性能风轮锥角功率调节风洞实验

A Deeper Understanding of the CO_(2)Emission Pathway Under China’s Carbon Emission Peak and Carbon Neutrality Goals

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Engineering 2023年第11期30卷 27-29页

作者： bofeng cai Li Zhang Yu Lei Jinnan Wang Center for Carbon Neutrality Chinese Academy of Environmental PlanningBeijing 100043China Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China

Achieving carbon neutrality is crucial in dealing with climate change and containing the increase in global temperature at below 1.5℃compared with preindustrial levels.During the general debate at the 75th session of the United Nations General Assembly in September 2020,President Xi Jinping announced that China would adopt more vigorous policies and measures against climate change.

关键词： dealing measures Carbon

Spatial-temporal changes of Tianjin urban spatial morphology from 1978 to 2004

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Journal of Geographical Sciences 2007年第4期17卷 500-510页

作者： cai bofeng ZHANG Zengxiang LIU Bin ZHOU Quanbin Institute of Remote Sensing Applications CAS Beijing 100101 China

Taken fractal dimension, compact ratio, urban centroid and urban principal axis as the urban spatial characteristic indices, Tianjin city＇s urban area is investigated in the last 26 years in a quantitative perspective, and its traits and changes during different periods are also analyzed. It is clear that these indices can not only scientifically and explicitly assess the urban morphology, urban direction and its changes and trends, but also uncover long-term effects of economy and urban planning on urban morphology.

关键词： urban spatial morphology fractai dimension compact ratio urban centroid urban principal axis Tianjin

Electro-optic lithium niobate metasurfaces

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Science China(Physics,Mechanics & Astronomy) 2021年第4期64卷 28-33页

作者： bofeng Gao MengXin Ren Wei Wu Wei cai JingJun Xu The Key Laboratory of Weak-Light Nonlinear Photonics Ministry of EducationSchool of Physics and TEDA Applied Physics InstituteNankai UniversityTianjin 300071China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Many applications of metasurfaces require an ability to dynamically change their properties in the time domain. Electrical tuning techniques are of particular interest, since they pave a way to on-chip integration of metasurfaces with optoelectronic devices.In this work, we propose and experimentally demonstrate an electro-optic lithium niobate(EO-LN) metasurface that shows dynamic modulations to phase retardation of transmitted light. Quasi-bound states in the continuum(QBIC) are observed from this metasurface. By applying external electric voltages, the refractive index of lithium niobate(LN) is changed by Pockels EO nonlinearity, leading to efficient phase modulations to the transmitted light around the QBIC wavelength. The EO-LN metasurface developed in this study opens up new routes for potential applications in the field of displaying, pulse shaping, and spatial light modulating.

关键词： lithium niobate metasurfaces electro-optic modulation bound states in the continuum resonance

Specific patterns of XC02 observed by GOSAT during 2009-2016and assessed with model simulations over China

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Science China Earth Sciences 2020年第3期63卷 384-394页

作者： Nian BIE Liping LEI Zhonghua HE Zhaocheng ZENG Liangyun LIU Bing ZHANG bofeng cai Key Laboratory of Digital Earth Science Institute ofRemote Sensing and Digital EarthChinese Academy of SciencesBeijing 100094China University of Chinese Academy of Sciences Beijing 100094China Division of Geological and Planetary Sciences California Institute of TechnologyPasadena CA91125USA The Center for Climate Change and Environmental Policy Chinese Academy for Environmental PlanningMinistry of Environmental ProtectionBeijing 100012China

Spatiotemporal patterns of column-averaged dry air mole fraction of CO2(XCO2)have not been well characterized on a regional scale due to limitations in data availability and precision.This paper addresses these issues by examining such patterns in China using the long-term mapping XCO2 dataset(2009-2016)derived from the Greenhouse gases Observing SATellite(GOSAT).XCO2 simulations are also constructed using the high-resolution nested-grid GEOS-Chem model.The following results are found:Firstly,the correlation coefficient between the anthropogenic emissions and XCO2 spatial distribution is nearly zero in summer but up to 0.32 in autumn.Secondly,on average,XCO2 increases by 2.08 ppm every year from2010 to 2015,with a sharp increase of 2.6 ppm in 2013.Lastly,in the analysis of three typical regions,the GOSAT XCO2 time series is inbetter agreement with the GEOS-Chem simulation of XCO2 in the Taklimakan Desert region(the least difference with bias 0.65±0.78 ppm),compared with the northern urban agglomerationregion(-1.3±1.2 ppm)and the northeastern forest region(-1.4±1.4 ppm).The results are likely attributable to uncertainty in both the satellite-retrieved XCO2 data and the model simulation data.

关键词： GEOS-Chem GOSAT OCO-2 Specific pattern XCO2

Angiogenesis in a 3D model containing adipose tissue stem cells and endothelial cells is mediated by canonical Wnt signaling

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Bone Research 2017年第4期5卷 330-342页

作者： Xiaoxiao cai Jing Xie Yang Yao Xiangzhu Cun Shiyu Lin Taoran Tian bofeng Zhu Yunfeng Lin State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengdu 610041China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi'an Jiaotong UniversityXi'an 710004China Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases College of StomatologyXi'an Jiaotong UniversityXi'an 710004China Department of Forensic Genetics School of Forensic MedicineSouthern Medical UniversityGuangzhou 510515China

Adipose-derived stromal cells （ASCs） have gained great attention in regenerative medicine. Progress in our understanding of adult neovascularization further suggests the potential of ASCs in promoting vascular regeneration, although the specific cues that stimulate their angiogenic behavior remain controversial In this study, we established a three-dimensional （3D） angiogenesis model by co-culturing ASCs and endothelial cells （ECs） in collagen gel and found that ASC-EC-instructed angiogenesis was regulated by the canonical Wnt pathway. Furthermore, the angiogenesis that occurred in implants collected after injections of our collagen gel- based 3D angiogenesis model into nude mice was confirmed to be functional and also regulated by the canonical Wnt pathway. Wnt regulation of angiogenesis involving changes in vessel length, vessel density, vessel sprout, and connection numbers occurred in our system. Wnt signaling was then shown to regulate ASC- mediated paracrine signaling during angiogenesis through the nuclear translocation of β-catenin after its cytoplasmic accumulation in both ASCs and ECs. This translocation enhanced the expression of nuclear cofactor Lef-1 and cyclin D1 and activated the angiogenic transcription of vascular endothelial growth factor A （VEGFA）, basic fibroblast growth factor （bFGF）, and insulin-like growth factor 1 （IGF-1）. The angiogenesis process in the 3D collagen model appeared to follow canonical Wnt signaling, and this model can help us understand the importance of the canonical Wnt pathway in the use of ASCs in vascular regeneration.

关键词： Angiogenesis in a 3D model containing adipose tissue stem cells and endothelial cells is mediated by canonical Wnt signaling Wnt