检索结果-南通市图书馆

Journal of Environmental Sciences 2020年第1期32卷 163-172页

作者： qing zhou Xu Zhang School of Resources and Environmental Science Wuhan University

The effects of biosolids,ZnO,and ZnO/biosolids on soil microorganism and the environmental fate of coexisting racemic–quizalofop–ethyl(rac-QE)were *** biomass carbon in native soil,soil/biosolids decreased by 62%and 52%in the presence of ZnO(2‰,weight ratio).The soil bacterial community structure differed significantly among native soil,soil/biosolids,soil/ZnO,and soil/biosolids/ZnO based on a principal co-ordinate analysis(PCo A)of OTUs and one-way ANOVA test of bacterial *** transformation caused by ZnO only contributed 4%and 3% of the overall transformation of R-quizalofop-ethyl(R-QE)and S-quizalofop-ethyl(S-QE)in soil/*** inhibition effect of ZnO on the initial transformation rate of R-QE(rR-QE)and S-QE(rR-QE)in soil only observed when enantiomer concentration was larger than 10 mg/*** embedded with ZnO(biosolids/ZnO)caused a 17%–42% and 22%–38%decrease of rR-QE and rS-QE,although rR-QE and rS-QE increased by 0%–17% and 22%–58%by the addition of *** results also demonstrated that the effects of biosolids on agricultural soil microorganism and enantioselective transformation of chiral pesticide was altered by the embedded nanoparticles.

关键词： Bacterial structure Biosolids Chirality Enantiomer fraction ZnO

Cooperative Hedging in the Complete Market under g-expectation Constraint

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2011年第3期27卷 373-380页

作者： qing zhou School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

The paper studies the muiti-agent cooperative hedging problem of contingent claims in the complete market when the g-expected shortfall risks are bounded. We give the optimal cooperative hedging strategy explicitly by... 详细信息

关键词： hedging Neyman Pearson lemma g-probability backward stochastic differential equation

Reflected and Doubly Reflected BSDEs for L'evy Processes:Solutions and Comparison

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2010年第2期26卷 333-344页

作者： qing zhou School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

In this paper we study reflected and doubly reflected backward stochastic differential equations （BSDEs, for short） driven by Teugels martingales associated with L^vy process satisfying some moment condi- tions and by an independent Brownian motion. For BSDEs with one reflecting barrier, we obtain a comparison theorem using the Tanaka-Meyer formula. For BSDEs with two reflecting barriers, we first prove the existence and uniqueness of the solutions under the Mokobodski＇s condition by using the Snell envelope theory and then we obtain a comparison result.

关键词： Backward stochastic differential equation L^vy process Teugels martingale Comparison theorem,Snell envelope

On Comparison Theorem and Solutions of BSDEs for Lévy Processes

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2007年第3期23卷 513-522页

作者： qing zhou School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

In this paper, we consider backward stochastic differential equations driven by a Levy process. A comparison theorem and an existence and uniqueness theorem of BSDEs with non-Lipschitz coefficients are obtained.

关键词： Backward stochastic differential equation Comparison theorem

TWO-AGENT PARETO OPTIMAL COOPERATIVE INVESTMENT IN INCOMPLETE MARKET:AN EQUIVALENT CHARACTERIZATION

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2011年第4期24卷 701-710页

作者： qing zhou School of Science Beijing University of Posts and Telecommunications Beijing 100876 China.

This paper studies the following cooperative investment game with two agents. At the start of the game, both the agents＇ capital are collected. The total capital are then invested according to a certain trading strategy. At a certain time To one agent quits the cooperation and they divide the wealth among themselves. During the remaining period [To, T], the other agent invests his/her capital following a possibly different trading strategy. By stochastic optimization method combined with the theory of Backward Stochastic Differential Equations （BSDEs, for short）, we give an equivalent characterization of the Pareto optimal cooperative strategies.

关键词： Backward stochastic differential equation cooperative investment incomplete market,Pareto optimum stochastic utility.

Reflected SPDEs Driven by Fractional Noises

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2020年第2期36卷 347-360页

作者： Juan YANG qing zhou School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

In this paper,we study the stochastic partial differential equation with two reflecting smooth walls h^1 and h^2,driven by a fractional noise,which is fractional in time and white in *** large deviation principle for the law of the solution to this equation,will be established through developing a classical ***,we obtain the H?lder continuity of the solution.

关键词： stochastic partial differential equations with two reflecting walls fractional Brownian motion large deviation principle Holder continuity

The glucosinolate regulation in plant: A new view on lanthanum stimulating the growth of plant

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2019年第5期37卷 555-564页

作者： qing Yang Lihong Wang Li zhou Zhenbiao Yang qing zhou Xiaohua Huang National and Local Joint Engineering Research Center of Biomedical Functional Materials Jiangsu Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University State Key Laboratory of Food Science and Technology Jiangnan University Center for Plant Cell Biology Institute for Integrative Genome Biology University of California

The harmful effect of low-concentration lanthanum [La(Ⅲ)] on plants was investigated by choosing horseradish as a representative of plants and using the methods of physics, analytical chemistry and biology. The results show that the genetic expressions related to glucosinolates(GLS, the marker of plant resisting harmful effects) synthesis are significantly increased after the endocytosis in leaf cells is initiated by low-concentrations La(Ⅲ). Consequently, the activities in the key enzymes for catalyzing the GLS synthesis are promoted. Meanwhile, the contents of the precursors and substrates in GLS synthesis are increased. All the above changes accelerate the GLS synthesis and result in the maximum increase in GLS content by 14%. Finally, the uptake of nutrient elements in horseradish is enhanced, and the yield of horseradish is maximally increased by 25%. Therefore, low-concentration La(Ⅲ) is harmful to plants, and plants can promote growth to resist the harmful effects of low-concentration La(Ⅲ) by regulating GLS content. The results show a new insight into how rare earth elements stimulate plant growth, and provide a reference for the risk assessment of rare earth elements.

关键词： Low-concentration rare earth elements Glucosinolates Genetic expression Response Harmful effect Environmental adaptation

Fully Quantized Theory of Six-Wave Mixing with Matter Waves

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第2期49卷 477-478页

作者： zhou qing Ping Department of Information and Automatization Jishou University Zhangjiajie 427000 China Department of Physics Hunan Normal University Changsha 410081 China

We show that Wu-Yang theory of fully quantized four-wave mixing can be generalized to the six-wave mixing and derive the analytical solution of the coupled equations describing the quantum dynamics of six-wave mixing.

关键词： multiwave mixing fully quantized theory matter waves

Population Dynamics and Emission Spectrum of a Cascade Three-Level Jaynes-Cummings Model with Intensity-Dependent Coupling in a Kerr-like Medium

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第4期45卷 727-731页

作者： zhou qing-Chun Department of Mathematics and Physics Jiangsu University of Science and Technology Zhenjiang 212003 China

By using the method of eigenvectors, the atomic populations and emission spectrum are investigated in a system that consists of a cascade three-level atom resonantly interacting with a single-mode tield in a Kerr-like medium. The atom and the field are assumed to be initially in the upper atomic state and the Fock state, respectively. Results for models with intensity-dependent coupling and with intensity-independent coupling are compared. It is found that both population dynamics and emission spectrum show no indications of atom-field decoupling in the strong field limit if the intensity-dependent coupling is taken into account.

关键词： population emission spectrum cascade three-level atom Kerr-like medium

A Computer Graphics-Based Framework for 3D Pose Estimation of Pedestrians

在线全文

学校读者我要写书评

暂无评论

Automotive Innovation 2021年第3期4卷 338-349页

作者： Jisi Tang qing zhou State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing 100084China

In pedestrian-to-vehicle collision accidents,adapting safety measures ahead of time based on actual pose of pedestrians is one of the core objectives for integrated *** can significantly enhance the performance of passive safety system when active safety maneuvers fail to avoid *** study proposes a deep learning model to estimate 3D pose of pedestrians from *** conventional pedestrian image datasets do not have available pose features to work with,a computer graphics-based(CG)framework is established to train the system with synthetic *** 3D meshes of standing males are first transformed into several walking poses,and then rendered as images from multiple view ***,a matrix of 50 anthropometries,10 gaits and 12 views is built,in total of 6000 images.A two-branch convolutional neural network(CNN)was trained on the synthetic *** model can simultaneously predict 16 joint landmarks and 14 joint angles of pedestrian for each image with high *** errors of the predictions are 0.54 pixels and−0.06°,*** specific pose can then be completely reconstructed from the ***,the current study has established a CG-based pipeline to generate photorealistic images with desired features for the training;it demonstrates the feasibility of leveraging CNN to estimate the pose of a walking pedestrian from synthesized *** proposed framework provides a starting point for vehicles to infer pedestrian poses and then adapt protection measures accordingly for imminent impact to minimize pedestrian injuries.

关键词： Pose estimation Pedestrian safety Computer graphics Convolutional neural network