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China's participation in and contribution to IPCC

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Science Bulletin 2019年第4期64卷 213-215页

作者： yun gao Department of Science & Technology and Climate Change China Meteorological Administration

In 1988, the World Meteorological Organization (WMO) and the United Nations Environment Program (UNEP) jointly launched the In tergovern me ntal Panel on Climate Change (IPCC) to bring together scientists recommended by governments to assess the impacts of global climate change based on published literature. Five assessment reports have been released so far. In 2018, it marks the 30th anniversary of IPCC. Its previous reports, which are a collection of the up-to-date findings in climate change science at global level, have undergone rigorous expert and government reviews, hence recognized as an important source of scientific input to the international community in its understanding the climate change issue and devising a mechanism in response to it.

关键词： World WMO UNEP

m Components-Admissible Solutions of Systems of Higher-Order Partial Differential Equations on C^n

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Acta Mathematicae Applicatae Sinica 2008年第2期24卷 211-220页

作者： Ling-yun gao Department of Mathematics Jinan University Cuangzhou 510632 China

Using value distribution theory and techniques in several complex variables,we investigate the problem of existence of m components-admissible solutions of a class of systems of higher-order partial differential equations in several complex variables and estimate the number of admissible components of *** related results will also be obtained.

关键词： m components-admissible solutions several complex variables systems of partial differential equa-tions

Generalized P(N)-graded Lie superalgebras

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Frontiers of Mathematics in China 2021年第3期16卷 647-687页

作者： Jin CHENG yun gao School of Mathematics and Statistics Shandong Normal UniversityJinan250014China Department of Mathematics and Statistics York UniversityTorontoONM3J 1P3Canada

We generalize the P(N)-graded Lie superalgebras of *** generalization is not so restrictive but sufficient enough so that we are able to have a classification for this generalized P(N)-graded Lie *** result is that the generalized P(N)-graded Lie superalgebra L is centrally isogenous to a matrix Lie superalgebra coordinated by an associative superalgebra with a ***,L is P(N)-graded if and only if the coordinate algebra R is commutative and the super-involution is *** recovers Martinez-Zelmanov’s theorem for type P(N).We also obtain a generalization of Kac’s coordinatization via Tits-Kantor-Koecher ***,the motivation of this generalization comes from the Fermionic-Bosonic module construction.

关键词： Root system graded Lie superalgebras associative superalgebra quantum tori representations

A note on finite abelian covers

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Science China Mathematics 2011年第7期54卷 1333-1342页

作者： gao yun Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 China

We prove that any abelian cover over a smooth variety is defined by some cyclic equations. From the defining equations, we compute explicitly the normalization, branch locus, ramification indices, global invariants, and the resolution of singularities. As an application, we construct a new algebraic surface which is the quotient of ball.

关键词： abelian cover normalization irregularity the quotient of ball

Invariant Symmetric Bilinear Forms and Derivation Algebras of Unitary Lie Algebras

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Algebra Colloquium 2016年第3期23卷 I0001-I0002,361-384页

作者： Yelong Zheng Jiwen gao yun gao School of Mathematical Sciences and Wu Wen-Tsun Key Laboratory of Mathematics of Chinese Academy of Sciences University of Science and Technology of China Hefei 230026 China Department of Basic Courses Hefei College of Finance and Economics Hefei 230601 China Department of Mathematics and Statistics York University Toronto Ontario M3J 1P3 Canada

Invariant symmetric bilinear forms and derivation algebras of a unitary Lie algebra L over R are characterized：（L） ≌ （R＋/（[R, R] A R＋））＊ and Der（L） = Inn（L）＋ Der（L）0 = Inn（L）＋ SDer（R）, which recover what of the special linear Lie algebra and Steinberg Lie algebra over R, where R is a unital involutory associative algebra over a field F.

关键词： elementary unitary Lie algebra Steinberg unitary Lie algebra invariant sym-metric bilinear form derivation algebra

The 2 ℃ Global Temperature Target and the Evolution of the Long-TermGoal of Addressing Climate Change-From the United Nations FrameworkConvention on Climate Change to the Paris Agreement

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Engineering 2017年第2期3卷 272-278页

作者： yun gao Xiang gao Xiaohua Zhang Department of Sdence & Technology and Climate Change China Meteorological Administration Beijing 100081 China Energy Research Institute National Development and Reform Commission Beijing 100038 China National Center for Climate Change Strategy and International Cooperation (NCSC) Beijing 100038 China

The Paris Agreement proposed to keep the increase in global average temperature to well below 2 ℃ abovepre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 ℃ above pre-industriallevels. It was thus the first international treaty to endow the 2 ℃ global temperature target with legal *** qualitative expression of the ultimate objective in Article 2 of the United Nations Framework Conventionon Climate Change （UNFCCC） has now evolved into the numerical temperature rise target in Article 2 of theParis Agreement. Starting with the Second Assessment Report （SAR） of the Intergovernmental Panel on Cli-mate Change （IPCC）, an important task for subsequent assessments has been to provide scientific informa-tion to help determine the quantified long-term goal for UNFCCC negotiation. However, due to involvementin the value judgment within the scope of non-scientific assessment, the IPCC has never scientifically af-firmed the unacceptable extent of global temperature rise. The setting of the long-term goal for addressingclimate change has been a long process, and the 2 ℃ global temperature target is the political consensuson the basis of scientific assessment. This article analyzes the evolution of the long-term global goal foraddressing climate change and its impact on scientific assessment, negotiation processes, and global low-carbon development, from aspects of the origin of the target, the series of assessments carried out by the 1PCCfocusing on Article 2 of the UNFCCC, and the promotion of the global temperature goal at the political level.

关键词： Climate change International negotiationln tergovernmental Panel on Climate Change United Nations Framework Convention on Climate ChangeLong-term goal Critical vulnerability Intuitive building

Contrastive Studies on Theories of Chinese Complex Sentences, Sentence Group and the SDRT

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学术界 2013年第9期 281-287页

作者： gao yun School of Foreign Languages Yichun University Yichun Jiangxi 336000

Theories of Chinese complex sentences and sentence groups refer to the research of complex sentences and sentence groups in modern Chinese. The SDRTrefers to a dynamic semantic theory of discourse interpretation proposed in 1990s by *** contrastive studies on theories of Chinese complex sentences,sentence groups and the SDRT,we find that they have much in common.

关键词：中国子集动态语义句子

Spectrum of a class of fourth order left-definite differential operators

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Applied Mathematics(A Journal of Chinese Universities) 2008年第1期23卷 51-56页

作者： gao yun-lan SUN Jiong Dept. of Math. Inner Mongolia Univ. of Tech. Hohhot 010051 China. Dept. of Math. Inner Mongolia Univ. Hohhot 010021 China.

The spectrum of a class of fourth order left-definite differential operators is studied. By using the theory of indefinite differential operators in Krein space and the relationship between left-definite and right-definite operators, the following conclusions are obtained： if a fourth order differential operator with a self-adjoint boundary condition that is left-definite and right-indefinite, then all its eigenvalues are real, and there exist countably infinitely many positive and negative eigenvalues which are unbounded from below and above, have no finite cluster point and can be indexed to satisfy the inequality …≤λ-2≤λ-1≤λ-0〈0〈λ0≤λ1≤λ2≤…

关键词： left-definite differential operator right-definite differential operator Krein space spectrum,eigenvalue.

A collaborative strategy for enhanced reduction of Cr(Ⅵ) by Fe(0) in the presence of oxalate under sunlight:Performance and mechanism

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Journal of Environmental Sciences 2020年第4期32卷 385-394页

作者： Qi Zhou Yang Li Heng Yang yun gao College of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Chengdu Integrated Testing Center of Rocks and Ores Sichuan Geology and Mineral Exploration and Development BureauChengdu 610081China Anhui Electric Power Construction Second Engineering Co.Ltd. China Energy Construction GroupHefei 230000China

Nanometer-size zero-valent iron(NZVI)is an efficient reducing agent,but its surface is easily passivated with an oxide layer,leading to reaction *** our study,oxalate(OA)was introduced into this heterogeneous system of NZVI,which could form ferrioxalate complexes with the NZVI surface-bound Fe3+and dissolved Fe3+in the *** of ferrioxalate complexes can facilitate the generation of Fe2+from Fe3+and CO2·-radical,both species have strong reduction ***,a"photo-oxalate-Fe(0)"system through sunlight induction was established,which not only prohibited the formation of a surface passivation layer,but also displayed a synergetic mechanism of ferrioxalate photolysis to enhance reduction,exhibiting remarkably higher degradation activity(several times faster)toward the model pollutant Cr(Ⅵ)than the mechanism with NZVI *** tests suggested that both NZVI dosage and OA content markedly affected the reduction *** pH was beneficial to the reduction ***,recyclability experiment showed that the reduction rate decreased from 0.21706 to 0.03977 min-1 after three cycles of reuse due to the NZVI losing reaction activity generally,but the system still maintained considerable reduction ***,a mechanism was revealed whereby NZVI would transform to Fe oxides after the exhaustion of its reductive power,and the photolysis of ferrioxalate to promote the cycling of iron species played the predominant role in providing extra reduction *** features confirm that introduction of OA into Cr(Ⅵ)reduction by NZVI through sunlight induction is advantageous and promising.

关键词： Nanometer-size zero-valent iron Oxalate Sun irradiation Photolysis of ferrioxalate Cycling of surface iron Synergetic mechanism