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Quantum public-key crypto via EPR pairs

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 58-63页

作者： xiang-qun Fu Hong-Wei Li Jian-Hong Shi Tan Li Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography Information Engineering University Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China

With the development of quantum computing technology, quantum public-key cryptography is gradually becoming an alternative to the existing classical public-key cryptography. This paper designs a quantum trapdoor one-way function via EPR pairs and quantum measurements. Based on this, a new quantum public-key cryptosystem is presented, which offers forward security,and can resist the chosen-plaintext attack and chosen-ciphertext attack. Compared with the existing quantum public-key cryptos,eavesdropping can be automatically detected in this new quantum public-key cryptosystem under a necessary condition, which is also detailed in the paper.

关键词： quantum public-key crypto trapdoor one-way function EPR pairs

基于硫酸钠溶液电解的废旧镍氢电池全金属回收

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Transactions of Nonferrous Metals Society of China 2023年第12期33卷 3860-3870页

作者：方加虎何雨林诸葛祥群罗志虹罗鲲丁正平刘晓腾李义兵常州大学材料科学与工程学院常州动力电池智能制造与先进技术重点实验室常州213164 桂林理工大学有色金属与材料新加工技术教育部重点实验室桂林541004

提出废旧镍氢(Ni-MH)电池全金属可持续回收的方法,分别用硫酸钠溶液电解获得的H_(2)SO_(4)和NaOH溶液作为浸出剂和沉淀试剂。电极材料在温和条件下浸出,超过99%的稀土元素在pH1.0时以双硫酸盐的形式从溶液中沉淀,进而通过与NaOH反应转... 详细信息

提出废旧镍氢(Ni-MH)电池全金属可持续回收的方法,分别用硫酸钠溶液电解获得的H_(2)SO_(4)和NaOH溶液作为浸出剂和沉淀试剂。电极材料在温和条件下浸出,超过99%的稀土元素在pH1.0时以双硫酸盐的形式从溶液中沉淀,进而通过与NaOH反应转化为氢氧化物。在后续浸出液的纯化过程中,Al^(3+)和Fe^(3+)在pH 5.5时沉积,Zn^(2+)和Mn^(2+)用皂化D2EHPA-煤油从浸出液中萃取出来,形成两种具有工业价值的氢氧化物副产品。Ni^(2+)和Co^(2+)在pH9.5时沉淀,总回收率为97.5%。Na_(2)SO_(4)的总回收率达97%。这种金属回收方法可带来明显的经济效益,且闭环处理过程中无固体或液体废弃物。

关键词：废旧镍氢电池金属回收电解硫酸钠闭环过程

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On a BMAP/G/1 G-queue with Setup Times and Multiple Vacations

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Acta Mathematicae Applicatae Sinica 2011年第4期27卷 625-638页

作者： Yi PENG xiang-qun YANG School of Mathematical Science and Computing Technology Central South University Changsha 410075 Hunan China College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China

In this paper, we consider a BMAP/G/1 G-queue with setup times and multiple vacations. Arrivals of positive customers and negative customers follow a batch Markovian arrival process （BMAP） and Markovian arrival process （MAP） respectively. The arrival of a negative customer removes all the customers in the system when the server is working. The server leaves for a vacation as soon as the system empties and is allowed to take repeated （multiple） vacations. By using the supplementary variables method and the censoring technique, we obtain the queue length distributions. We also obtain the mean of the busy period based on the renewal theory.

关键词： G-queues batch Markovian arrival process (BMAP) setup times multiple vacations censoring technique Markov chains

Canonical Quantum Teleportation of Two-Particle Arbitrary State

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Communications in Theoretical Physics 2005年第2X期44卷 353-355页

作者： HAO xiang ZHU Shi-qun School of Physical Science and Technology Suzhou University Suzhou 215006 China

The canonical quantum teleportation of two-particle arbitrary state is realized by means of phase operator and number operator. The maximally entangled eigenstates between the difference of phase operators and the sum of number operators are considered as the quantum channels. In contrast to the standard quantum teleportation, the different unitary local operation of canonical teleportation can be simplified by a general expression.

关键词： canonical teleportation phase operator number operator general expression

DEM investigation of strain behaviour and force chain evolution of gravel-sand mixtures subjected to cyclic loading

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Particuology 2022年第9期20卷 13-28页

作者： Zhihong Nie qun Qi xiang Wang Yangui Zhu School of Civil Engineering Central South UniversityChangsha 410075China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China China Railway First Survey and Design Institute Group Co. Ltd.Xi'an 710043China

The strain characteristic and load transmission of mixed granular matter are different from those of homogeneous granular *** loading renders the mechanical behaviours of mixed granular mat-ter more *** investigate the dynamic responses of gravel-sand mixtures,the discrete element method(DEM)was used to simulate the cyclic loading of gravel-sand mixtures with low fines ***,the evolution of the axial strain and volumetric strain was ***-cally,the coordination number and contact force anisotropy were studied,and the evolution of strong and weak contacts was explored from two dimensions of loading time and local *** simulation results show that increasing fines content can accelerate the development of the axial strain and vol-umetric strain but has little effect on the evolution of contact *** contacts tend to develop along the loading boundary,presenting the spatial *** contacts are firstly controlled by confining pressure and then controlled by axial stress,while strong contacts are mainly controlled by axial stress throughout the whole cyclic *** compression failure occurs,the release of axial stress causes the reduction of strong contact proportion in all local *** findings are helpful to understand the dynamic responses of gravel-sand mixtures,especially in deformation behaviours and the Spatio-temporal evolution of contact forces.

关键词： Gravel-sand mixture Cyclic loading DEM Strain Contact force

Unified Characteristic Numbers and Solutions of Equations for Birth and Death Processes with Barriers

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Acta Mathematicae Applicatae Sinica 2010年第3期26卷 443-454页

作者： xiang-qun Yang He-song Wang College of Mathematics and Computer Science Hunan Normal University. Changsha 410081 China College of Mathematics and Computer Science Changsha University of Science and Technology Changsha410076 China

The state 0 of a birth and death process with state space E = {0, 1, 2,....} is a barrier which can be classified into four kinds： reflection, absorption, leaping reflection, quasi-leaping reflection. For the first, second and fourth barriers, the characteristic numbers of different forms have been introduced. In this paper unified characteristic numbers for birth and death processes with barriers were introduced, the related equations were solved and the solutions were expressed by unified characteristic numbers. This paper concerns work solving probability construction problem of birth and death processes with leaping reflection barrier and quasi-leaping reflection barrier.

关键词： birth and death process with barrier reflection and absorption leaping reflection andquasi-reflection characteristic numbers solutions of equations

Optimal Dividend Strategy in Compound Binomial Model with Bounded Dividend Rates

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 859-870页

作者： Ji-yang TAN xiang-qun YANG School of Mathematics and Computational Science Xiangtan University College of Mathematics and Computer Science Hunan Normal University

We consider the compound binomial model, and assume that dividends are paid to the shareholders according to an admissible strategy with dividend rates bounded by a *** company controls the amount of dividends in order to maximize the cumulative expected discounted dividends prior to ruin. We show that the optimal value function is the unique solution of a discrete HJB equation. Moreover, we obtain some properties of the optimal payment strategy, and offer a simple algorithm for obtaining the optimal strategy. The key of our method is to transform the value function. Numerical examples are presented to illustrate the transformation method.

关键词： compound binomial model optimal dividend strategy transformation

Criterion of Semi-Markov Dependent Risk Model

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Acta Mathematica Sinica,English Series 2014年第7期30卷 1273-1280页

作者： Xiao Yun MO xiang qun YANG Department of Basic Subjects Hu’nan University of Finance and Economics College of Mathematics and Computer Science Hu’nan Normal University

A rigorous definition of semi-Markov dependent risk model is given. This model is a generalization of the Markov dependent risk model. A criterion and necessary conditions of semi- Markov dependent risk model are obtained. The results clarify relations between elements among semi-Markov dependent risk model more clear and are applicable for Markov dependent risk model.

关键词： Semi-Markov dependent risk model Markov dependent risk model criterion necessarycondition Markov chain

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Research in Astronomy and Astrophysics 2014年第9期14卷 1055-1060页

作者： Ding-Qiang Su xiang-qun Cui Department of Astronomy Nanjing University Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education National Astronomical Observatories/Nanjing Institute of Astronomical Optics and Technology(NIAOT) Chinese Academy of Sciences

China will establish a 2-meter space-based astronomical telescope. Its main science goals are performing a sky survey for research about dark matter and dark energy, and high resolution observations. Some experts suggest that this space telescope should be installed inside the Chinese space station. In accord with this suggestion we put forward our first configuration, i.e., to adopt a coude system for this telescope. This coude system comes from the Chinese 2.16 m telescope＇s coude system, which includes a relay mirror so that excellent image quality can be obtained. In our second configuration, we suggest that the whole space telescope fly freely as an independent satellite outside the space station. When it needs servicing, for example, changing in- struments, refilling refrigerant or propellant, etc., this space telescope can fly near or even dock with the core space station. Although some space stations have had accom- panying satellites, the one we propose is a space telescope that will be much larger than other accompanying satellites in terms of weight and volume. On the basis of the second configuration, we also put forward the following idea： the space station can be composed of several large independent modules if necessary.

关键词： instruments -- space telescope -- space station -- survey -- high angu- lar resolution