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Search Results: 1 - 10 of 23128 matches for " Yifan Yuan "
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The Development Status, Problems and Countermeasures of China’s Carbon Financial Market  [PDF]
Yifan Yuan
Low Carbon Economy (LCE) , 2016, DOI: 10.4236/lce.2016.71007
Abstract: In recent years, the global climate governance is not just for a global environmental problem of climate change, more involved in international politics, economy, investment, technology and other fields, and involves the transformation of production and life style. Accompanied by global energy and technology revolution, the development of low carbon is our inevitable requirement. Recently, China submitted to UNFCCC (United Nations Framework Convention on Climate Change) the Secretariat of the national independent contribution plan and set emission reduction targets: carbon dioxide emissions reach the peak in 2030 and strive to reach the peak as early as possible; carbon emission intensity decreased by 60% - 65% compared with that in 2005. This means that our government will intensify its efforts to reduce carbon emissions. In the past, our target was to reduce carbon emissions intensity, but now our country is to realize the reduction of total carbon emissions, or “absolute reduction”. Carbon finance is an important breakthrough in the development of low carbon economy and the promotion of carbon emission reduction. This paper focuses on the analysis of the development status of China’s carbon financial market, the problems and the opportunities and challenges faced, and finally, the relevant countermeasures and suggestions are given from the perspectives of policy, talent, mechanism, international cooperation and so on, in order to promote the development of carbon financial market innovation, to seize the commanding heights of the era of low-carbon economy.
Combined Focusing and Flat-Field Spectrometer System for Extreme Ultraviolet Pulse  [PDF]
Yifan Kang, Chao Wang
Optics and Photonics Journal (OPJ) , 2017, DOI: 10.4236/opj.2017.78B003
For reducing both extreme ultraviolet attosecond pulses energy loss in the focusing reflection process and measurement error caused by pulse focusing aberration, as well as improving the operability of pulse spectroscopy monitoring, a combined focusing and flat-field spectrometer analysis system for attosecond pulse is proposed and designed through step-by-step performance optimization. The focusing and spectrum-analyzing components are gold- coated grazing incidence to roidal mirror and grazing incidence concave focusing grating, respectively. The characteristic parameters of the system are given in details. The system proposed can find application in research platform of attosecond spectroscopy using high energy short attosecond pulse as basic probe tool.
The Curative HCV Treatments in China  [PDF]
Yifan Fei, Jiawen Jiang
Journal of Biosciences and Medicines (JBM) , 2018, DOI: 10.4236/jbm.2018.68004
Abstract: Hepatitis C disease is caused by hepatitis C virus (HCV) which causes chronic infections in about 180 million individuals worldwide. HCV has been identified as the etiologic agent of hepatitis C in 1989 and for the longest time it is very difficult to treat chronic carriers who are at risk of developing severe liver disease. Now there are three main combined treatments which can increase curative ratio from 10% to more than 90%. The advents of so called directly, acting antivirals (DAAs) in the last few years has revolutionized HCV treatment as these drug combinations can effectively cure HCV in the great majority of patients. The impact of DAAs on global disease burden has been limited, however, by the very drug prices. In this paper the situation was analyzed in China, Europe and Australia. DAAs have been made available to patients in Europe and Australia for several years and are generally accessible. The treatment is highly subsidized by the government, thereby making it possible for all patients in need to access therapy. DAAs have only been very recently been adopted for treatment of chronic hepatitis C in China. In our research, only the method of literature search from both Chinese websites and Foreign websites including journals, magazines and internet search is used. We analyze and compare the solutions that each of these countries is providing to their respective patient populations. Given the large number of chronic HCV carriers in China and other less developed countries solutions have to be found to produce DAAs most cost effectively.
Compressing Electron Pulse with Alternating Electric Field  [PDF]
Chao Wang, Yifan Kang
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.611192
A novel technique of symmetric type quasi-linear electron pulse duration modulation is proposed. The salient feature from the conventional photoelectron gun is the introduction of the alternating electric field resonator. The electric field that results is synchronously controlled to generate the desired quasi-linear differential energy modulation on the electron pulse passing through. The effect resulted directly is that the leading electrons undergo negative energy modulation and decelerate, while the rear ones positive energy modulation and accelerate, which eventually leads to electron-pulse-duration modulation. The technical details are demonstrated.
Apery limits and special values of L-functions
Yifan Yang
Mathematics , 2007, DOI: 10.1016/j.jmaa.2008.01.094
Abstract: We describe a general method to determine the Apery limits of a differential equation that have a modular-function origin. As a by-product of our analysis, we discover a family of identities involving the special values of L-functions associated with modular forms. The proof of these identities is independent of differential equations and Apery limits.
Modular unit and cuspidal divisor class groups of X_1(N)
Yifan Yang
Mathematics , 2007,
Abstract: In this article, we consider the group $F_1^\infty(N)$ of modular units on $X_1(N)$ that have divisors supported on the cusps lying over $\infty$ of $X_0(N)$, called the $\infty$-cusps. For each positive integer $N$, we will give an explicit basis for the group $F_1^\infty(N)$. This enables us to compute the group structure of the rational torsion subgroup $C_1^\infty(N)$ of the Jacobian $J_1(N)$ of $X_1(N)$ generated by the differences of the $\infty$-cusps. In addition, based on our numerical computation, we make a conjecture on the structure of the $p$-primary part of $C_1^\infty(p^n)$ for a regular prime $p$.
Modular forms of half-integral weights on SL(2,Z)
Yifan Yang
Mathematics , 2011,
Abstract: In this paper, we prove that, for an integer $r$ with $(r,6)=1$ and $0
Schwarzian differential equations and Hecke eigenforms on Shimura curves
Yifan Yang
Mathematics , 2011, DOI: 10.1112/S0010437X12000371
Abstract: Let $X$ be a Shimura curve of genus zero. In this paper, we first characterize the spaces of automorphic forms on $X$ in terms of Schwarzian differential equations. We then devise a method to compute Hecke operators on these spaces. An interesting by-product of our analysis is the evaluation $$_2F_1(1/24,7/24,5/6, -\frac{2^{10}\cdot3^3\cdot5}{11^4})=\sqrt6 \sqrt[6]{\frac{11}{5^5}} $$ and other similar identities.
A New Family of Surfaces with K^2=7 and p_g=0
Yifan Chen
Mathematics , 2012,
Abstract: We construct a new family of minimal smooth surfaces of general type with K^2=7 and p_g= 0. We show that for a surface in this family, its canonical divisor is ample and its bicanonical morphism is birational. We prove that these surfaces satisfy Bloch's conjecture.
Ramanujan-type identities for Shimura curves
Yifan Yang
Mathematics , 2013,
Abstract: In 1914, Ramanujan gave a list of 17 identities expressing $1/\pi$ as linear combinations of values of hypergeometric functions at certain rational numbers. Since then, identities of similar nature have been discovered by many authors. Nowadays, one of the standard approaches to this kind of identities uses the theory of modular curves. In this paper, we will consider the case of Shimura curves and obtain Ramanujan-type formulas involving special values of hypergeometric functions and products of Gamma values. The product of Gamma values are related to periods of elliptic curves with complex multiplication by Q(\sqrt{-3}) and Q(\sqrt{-4}).
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