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Science China Mathematics 2017年第2期60卷 317-344页

作者： ZHAO Hui WENG ChengGuo shen yang ZENG Yan School of Science Tianjin University Tianjin 300072 China Department of Statistics and Actuarial Science University of Waterloo Waterloo ON N2L 3GI Canada Department of Mathematics and Statistics York University Toronto ON M3J IP3 Canada Lingnan (University) College Sun Yat-sen University Guangzhou 510275 China

The present paper studies time-consistent solutions to an investment-reinsurance problem under a mean-variance *** paper is distinguished from other literature by taking into account the interests of both an insurer and a reinsurer *** claim process of the insurer is governed by a Brownian motion with a drift.A proportional reinsurance treaty is considered and the premium is calculated according to the expected value *** the insurer and the reinsurer are assumed to invest in a risky asset,which is distinct for each other and driven by a constant elasticity of variance *** optimal decision is formulated on a weighted sum of the insurer’s and the reinsurer’s surplus *** a verification theorem,which is established with a formal proof for a more general problem,explicit solutions are obtained for the proposed investment-reinsurance ***,numerous mathematical analysis and numerical examples are provided to demonstrate those derived results as well as the economic implications behind.

关键词： investment-reinsurance problem mean-variance analysis time-consistent strategy constant elas-ticity of variance model

Certificateless universal designated verifier signature schemes

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The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 85-90,94页

作者： MING yang shen Xiao-qin WANG Yu-min State Key Laboratory of Integrated Service Network Xidian UniversityXi'an 710071 China

Universal designated verifier signature schemes allows a signature holder to designate the signature to a desire designated verifier, in such a way that only designated verifier can verify this signature, but is unable to convince anyone else of this fact. The previous constructions of universal designated verifier signature rely on the underlying public key infrastructure, that needs both signers and verifiers to verify the authenticity of the public keys, and hence, the certificates are required. This article presents the first model and construction of the certificateless universal designated verifier signature scheme, in which the certificates are not needed. The proposed scheme satisfies all the requirements of the universal designated verifier signature in the certificateless system. Security proofs are provided for the scheme based on the random oracle model, assuming that the Bilinear diffie-hellman （BDH） problem is hard to solve.

关键词： certificateless cryptography universal designated verifier signature bilinear pairing

Development of Transgenic Glyphosate-Resistant Rice with G6 Gene Encoding 5-Enolpyruvylshikimate-3-Phosphate Synthase

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Agricultural Sciences in China 2011年第9期10卷 1307-1312页

作者： ZHAO Te LIN Chao-yang shen Zhi-cheng State Key Laboratory of Rice Biology and Institute of Insect Sciences Zhejiang University Hangzhou 310028 P.R. China

Glyphosate-resistant crops have been a huge economic success for genetic engineering. The creating of new glypbosateresistant plants would increase the available choices for planting and lower the price of genetically modified crop seeds. A novel G6 gene from Pseudomonas putida that encoded 5-enolpyruvylshikimate-3-phosphate synthase （EPSPS） was previously isolated. The G6 gene was transfected into rice via Agrobacterium-mediated transformation. The transgenic rice obtained was confirmed by PCR, Southern, and Western blots. The lab experiment and field trials further confirmed that the transgenic rice can survive glyphosate spraying at a dose of 8 g L^-1. In contrast, conventional rice was killed at a weed control glyphosate spray dose of 1 g L^-1. Altogether, the present study showed that the G6 gene works well in rice in vivo for glyphosate-resistance.

关键词： transgenic rice glyphosate-resistance EPSPS

Single photon response of superconducting nanowire single photon detector

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Chinese Science Bulletin 2010年第4期55卷 441-445页

作者： YOU LiXing shen XiaoFang yang XiaoYan State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China

Single photon detection is one of the key technologies for quantum key distribution in quantum communication. As a novel single photon detection technology, superconducting nanowire single photon detector (SNSPD) surpasses conventional semiconducting single photon detectors with high count rate and low dark count rate. In this article, we introduce SNSPD fabricated from NbN ultrathin superconducting film and lab-based SNSPD system. The characteristics of single photon response pulse of SNSPD are analyzed in detail. Also discussed is the relationship between waveform of single photon response and system bandwidth. Circuit model is made to analyze the performance of SNSPD. The simulation result agrees well with the experimental data. Those results are valuable for understanding the mechanism of SNSPD and building future SNSPD system for quantum communication.

关键词：单光子探测器超导薄膜纳米线反应量子通信高计数率 PD系统密钥分配

A DFT/TD-DFT study of effect of different substituent on ESIPT fluorescence features of 2-(2’-hydroxyphenyl)-4-chloromethylthiazole derivatives

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Chinese Physics B 2022年第3期31卷 589-596页

作者： shen-yang Su Xiu-Ning Liang Hua Fang Department of Chemistry and Material Science College of ScienceNanjing Forestry UniversityNanjing 210037China

Based on density functional theory(DFT) and time-dependent density functional theory(TD-DFT), the effects of substituent on the excited-state intramolecular proton transfer(ESIPT) process and photophysical properties of 2-(2’-hydroxyphenyl)-4-chloromethylthiazole(HCT) are studied. The electron-donating group(CH_(3), OH) and electronwithdrawing group(CF_(3), CHO) are introduced to analyze the changes of intramolecular H-bond, the frontier molecular orbitals, the absorption/fluorescence spectra, and the energy barrier of ESIPT process. The calculation results indicate that electron-donating group strengthens the intramolecular H-bond in the S_(1) state, and leads to an easier ESIPT process. The electron-withdrawing group weakens the corresponding H-bond and makes ESIPT process a little harder. Different substituents also affect the photophysical properties of HCT. The electron-withdrawing group(CF_(3), CHO) has a little effect on electronic spectra. The electron-donating group(CH_(3), OH) red-shifts both the absorption and fluorescence emission peaks of HCT, respectively, which causes the Stokes shift to increase.

关键词： excited-state intramolecular proton transfer(ESIPT) TD-DFT substitution

A growing system: Constituent elements and spatial evolution of ancient local Confucian temples in China

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Frontiers of Architectural Research 2023年第5期12卷 966-984页

作者： Bing Xie yang shen Xing Chen School of Architecture Southeast UniversityNanjing210096China Visual Image Research Base of Chinese Nation Southeast UniversityNanjing210096China

Taking the constituent elements other than the main buildings of local Confucian temples as a research object,including memorial archway,screen wall,Pan-chi(pond),worship altar,sacrificial hall,pavilion and tower,this paper combines textual narrative and historical measurement to sort out the production and development history of these constituent *** analyzes the spatial evolution trend of Confucian temples to present the dynamic processes of derivation of constituent elements and spatial evolution of local Confucian *** this basis,this paper surveys the causes of the growth of Confucian temples from a macro historical perspective by considering political,social and cultural *** dynamic development process,sacred and secular as it is,will grow and last forever under the multiple official implications and folk beliefs.

关键词： Confuciantemple Constituent elements Spatial evolution Causes

Gene regulatory network stabilized by pervasive weak repressions: micro RNA functions revealed by the May–Wigner theory

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National Science Review 2019年第6期6卷 1176-1188页

作者： Yuxin Chen yang shen Pei Lin Ding Tong Yixin Zhao Stefano Allesina Xu shen Chung-I Wu School of Life Science Sun Yat-Sen University Target Discovery Research Boehringer Ingelheim Pharma Gmb H & Co KG Department of Biostatistics School of Public Health Yale University Department of Ecology and Evolution University of Chicago

Food web and gene regulatory networks(GRNs) are large biological networks, both of which can be analyzed using the May–Wigner theory. According to the theory, networks as large as mammalian GRNs would require dedicated gene products for stabilization. We propose that micro RNAs(mi RNAs) are those products. More than 30% of genes are repressed by mi RNAs, but most repressions are too weak to have a phenotypic consequence. The theory shows that(i) weak repressions cumulatively enhance the stability of GRNs, and(ii) broad and weak repressions confer greater stability than a few strong ones. Hence, the diffuse actions of mi RNAs in mammalian cells appear to function mainly in stabilizing GRNs. The postulated link between m RNA repression and GRN stability can be seen in a different light in yeast, which do not have mi RNAs. Yeast cells rely on non-specific RNA nucleases to strongly degrade m RNAs for GRN stability. The strategy is suited to GRNs of small and rapidly dividing yeast cells, but not the larger mammalian cells. In conclusion, the May–Wigner theory, supplanting the analysis of small motifs, provides a mathematical solution to GRN stability, thus linking mi RNAs explicitly to ’developmental canalization’.

关键词： micro RNAs network stability canalization May–Wigner theory systems biology RNA crosstalk

Fatigue behavior of uncoated and MCrAlY-coated DS nickelbased superalloys pre-exposed in hot corrosion condition

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Rare Metals 2018年第11期37卷 936-941页

作者： Hong-Yu Qi Ji-shen yang Xiao-Guang yang Shao-Lin Li Li-Qiang Ma School of Energy and Power Engineering Beihang UniversityBeijing 100191China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100191China Beijing Key Laboratory of Aero-Engine Structure and Strength Beijing 100191China shenyang Aeroengine Research Institute Shenyang 110015China

The effects of a MCrAlY coating on low-cycle fatigue(LCF) behavior of directionally solidified(DS)nickle-based superalloy DZ125 were investigated. Before the fatigue testings, the specimens were pre-exposed in high-temperature hot corrosion(HTHC) environment generating by a burner rig at 850 ℃. The results show that the coating in hot corrosion condition has beneficial effects on the fatigue resistance of superalloy. Under corrosion condition, the MCrAlY-coated specimens tested have higher fatigue lives than the uncoated specimens at the same stress level. The coating failure results from fatigue process and numerous fatigue cracks were nucleated at the specimen surface, only one main crack propagates inward and the secondary cracks away from the fracture surface are perpendicular to the loading orientation.

关键词： MCrAlY coating Low-cycle fatigue Directionally solidified Ni-based superalloy Hot corrosion Prior exposure

Palladium-Catalyzed Cyclocarbonylation of 2-Halobenzaldehyde and Hydrazines： A Facile Synthesis of 2-Aminoisoindolin-l-ones

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Chinese Journal of Chemistry 2013年第2期31卷 182-186页

作者： Chao Han yang shen Ping Lu yanguang Wang Department of Chemistry Zhejiang University Hangzhou Zhejiang 310027 China

An efficient procedure for the synthesis of 2-aminoisoindolin-l-ones via a palladium-catalyzed three-component reaction of 2-halobenzaldehydes, hydrazines and carbon monoxide is reported. This cyclocarbonylation process can be performed smoothly under 1 atmospheric pressure of carbon monoxide to afford 2-aminoisoindolin- 1-ones in moderate to excellent yields.

关键词： cyclocarbonylation 2-aminoisoindolin-l-ones multicomponent reactions heterocycles

Synthesis of bacillamide 3 and its analogue

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Chinese Chemical Letters 2009年第10期20卷 1195-1197页

作者： Duo Li Hai shen yang Qing Cui shen Jie Mao Xiao Hua Xu State Key Laboratory of Elemento-Organic Chemistry Nankai University Tlanjin 300071 China

The bacillamide 1 is a new algaecide from the marine bacterium Bacillus sp. SY-1. Its analogues bacillamide 3 and alkaloid 4 were firstly synthesized effectively from D-alanine. The key step was a coupling reaction via the mixed anhydride. All structures were confirmed by IH NMR and 13C NMR. The final compounds were confirmed by 1H NMR, 13C NMR and HRMS and the results are consistent with the reported natural products.

关键词： Bacillamide Thiazole rings Tryptamide Synthesis