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Acta Mathematica Sinica,English Series 2017年第7期33卷 1011-1020页

作者： Hong hai liu School of Mathematics and information Science He'nan Polytechnic UniversityJiaozuo 454003P.R.China

Abstract In this paper, we give counterexamples to show that variation and oscillation operators related to rough truncations of the Hilbert transform are not bounded from H1 to L1, and prove variation, oscillation an... 详细信息

关键词： Variation operator oscillation operator A-jump operator the Hilbert transform Hardyspace

A federated learning scheme meets dynamic differential privacy

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CAAI Transactions on Intelligence Technology 2023年第3期8卷 1087-1100页

作者： Shengnan Guo Xibin Wang Shigong Long hai liu liu hai Toong hai Sam State Key Laboratory of Public Big Data College of Computer Science and TechnologyGuizhou UniversityGuiyangChina School of Big Data Key Laboratory of Electric Power Big Data of Guizhou ProvinceGuizhou Institute of TechnologyGuiyangChina School of Information Guizhou University of Finance and EconomicsGuiyangChina Faculty of Business and Communication INTI International UniversityNilaiMalaysia

Federated learning is a widely used distributed learning approach in recent years,however,despite model training from collecting data become to gathering parameters,privacy violations may occur when publishing and sharing models.A dynamic approach is pro-posed to add Gaussian noise more effectively and apply differential privacy to federal deep ***,it is abandoning the traditional way of equally distributing the privacy budget e and adjusting the privacy budget to accommodate gradient descent federation learning dynamically,where the parameters depend on computation derived to avoid the impact on the algorithm that hyperparameters are created *** also incorporates adaptive threshold cropping to control the sensitivity,and finally,moments accountant is used to counting the∈consumed on the privacy‐preserving,and learning is stopped only if the∈_(total)by clients setting is reached,this allows the privacy budget to be adequately explored for model *** experimental results on real datasets show that the method training has almost the same effect as the model learning of non‐privacy,which is significantly better than the differential privacy method used by TensorFlow.

关键词： data privacy machine learning security of data

Ground states of a nonlinear Schrodinger system with nonconstant potentials

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Science China Mathematics 2015年第2期58卷 257-278页

作者： liu hai Dong liu Zhao Li College of Mathematics Physics and Information Engineering Jiaxing University School of Mathematical Sciences Capital Normal University

In the case where either the potentials Vj,μj andβare periodic or Vj are well-shaped andμj andβare anti-well-shaped,existence of a positive ground state of the Schrdinger system -Δu1+V1(x)u1=μ1(x)u31+β(x)u1u22in RN,-Δu2+V2(x)u2=β(x)u21u2+μ2(x)u32in RN,uj∈H1(RN),j=1,2,where N=1,2,3,is proved provided thatβis either small or large in terms of Vj andμ*** system with constant coefficients has been studied extensively in the last ten years,and the nonconstant coefficients case has seldom been *** turns out that new technical machineries in the setting of variational methods are needed in dealing with the nonconstant coefficients case.

关键词：薛定谔非恒定系统非线性基态变分方法 U31 常系数

A thermodynamic hypothesis regarding optimality principles for flow processes in geosystems

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Chinese Science Bulletin 2014年第16期59卷 1880-1884页

作者： Hui-hai liu Earth Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

This paper proposes a new thermodynamic hypothesis that states that a nonlinear natural system that is not isolated and involves positive feedbacks tends to minimize its resistance to the flow process through it that is imposed by its *** demonstrate that the hypothesis is consistent with flow behavior in saturated and unsaturated porous media,river basins,and the Earthatmosphere *** optimization for flow processes has been previously discussed by a number of researchers in the literature,the unique contribution of this work is to indicate that only the driving process is subject to optimality when multiple flow processes are simultaneously involved in a system.

关键词：地球系统流动过程热力学假说饱和多孔介质自然系统江河流域流动行为

Interplay between hydrogen sulfide and other signaling molecules in the regulation of guard cell signaling and abiotic/biotic stress response

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Plant Communications 2021年第3期2卷 11-26页

作者： hai liu Shaowu Xue College of Life Science and Technology Huazhong Agricultural UniversityWuhan 430070China

Stomatal aperture controls the balance between transpirational water loss and photosynthetic carbon dioxide(CO2)*** are surrounded by pairs of guard cells that sense and transduce environmental or stress signals to induce diverse endogenous responses for adaptation to environmental *** a recent decade,hydrogen sulfide(H2S)has been recognized as a signaling molecule that regulates stomatal *** this review,we summarize recent progress in research on the regulatory role of H2S in stomatal movement,including the dynamic regulation of phytohormones,ion homeostasis,and cell structural *** focus especially on the cross talk among H2S,nitric oxide(NO),and hydrogen peroxide(H2O2)in guard cells,as well as on H2S-mediated post-translational protein modification(cysteine thiol persulfidation).Finally,we summarize the mechanisms by which H2S interacts with other signaling molecules in plants under abiotic or biotic *** on evidence and clues from existing research,we propose some issues that need to be addressed in the future.

关键词： hydrogen sulfide stomatal guard cell phytohormone persulfidation abiotic/biotic stress signaling molecule

Role of platelet-activating factor in pathogenesis of acute pancreatitis

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World Journal of Gastroenterology 2006年第4期12卷 539-545页

作者： Li-Rong liu Shi-hai Xia Department of Gastroenterology Pancreas Center of Affiliated Hospital of Medical College of the Chinese People's Armed Police Forces Tianjin 300162 China

Platelet-activating factor(PAF)is a potentproinflammatory phospholipid mediator that belongsto a family of biologically active,structurally relatedalkyl phosphoglycerides with diverse pathologicaland physiological *** bioactive phospholipidmediates processes as diverse as wound healing,physiological inflammation,angiogenesis,apoptosis,reproduction and long-term *** actsby binding to a specific G protein-coupled receptorto activate multiple intracellular signaling *** most cells both synthesize and release PAFand express PAF receptors,PAF has potent biologicalactions in a broad range of cell types and *** activation of this signaling pathway isassociated with many diseases in which inflammationis thought to be one of the underlying ***(AP)is a common inflammatory *** onset of AP is pancreatic autodigestion mediatedby abnormal activation of pancreatic enzyme caused bymultiple agents,which subsequently induce pancreaticand systemic inflammatory reactions.A number ofexperimental pancreatitis and clinical trials indicatethat PAF does play a critical role in the pathogenesisof *** of PAF receptor antagonist cansignificantly reduce local and systemic events that occurin *** review focuses on the aspects that are morerelevant to the pathogenesis of AP.

关键词： Platelet-activating factor Signal transduction Pancreatitis Pathogenesis

Hydrogen sulfide (H_(2)S) signaling in plant development and stress responses

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aBIOTECH 2021年第1期2卷 32-63页

作者： hai liu Jicheng Wang Jianhao liu Tong liu Shaowu Xue College of Life Science and Technology Huazhong Agricultural UniversityWuhan 430070China

Hydrogen sulfide(H_(2)S)was initially recognized as a toxic gas and its biological functions in mammalian cells have been gradually discovered during the past *** the latest decade,numerous studies have revealed that H_(2)S has versatile functions in plants as *** this review,we summarize H_(2)Smediated sulfur metabolic pathways,as well as the progress in the recognition of its biological functions in plant growth and development,particularly its physiological functions in biotic and abiotic stress *** direct chemical reactions,nitric oxide(NO)and hydrogen peroxide(H_(2)O2)have complex relationships with H_(2)S in plant signaling,both of which mediate protein post-translational modification(PTM)to attack the cysteine *** also discuss recent progress in the research on the three types of PTMs and their biological functions in ***,we propose the relevant issues that need to be addressed in the future research.

关键词： stress sulfide versatile

Quasi-static-dynamic formability of AA5052-O sheet under uniaxial and plane-strain tension

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 318-325页

作者： liu Da-hai YU hai-ping LI Chun-feng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

An experimental study on the quasi-static-dynamic formability specified in electromagnetically assisted sheet metal stamping(EMAS)was presented.A series of uniaxial and plane-strain tensile experiments were carried out on AA5052-O sheet by using a combined quasi-static stretching and pulsed electromagnetic forming(EMF)*** strains representing formability beyond conventional quasi-static forming limits are observed under both uniaxial tensile and plane-strain *** total forming limits of the as-received aluminum alloy undergoing both low and high quasi-static pre-straining are almost similar in quasi-static-dynamic *** total formability seems to depend largely on the high-velocity loading ***, it appears that for quasi-static-dynamic deformation,the quasi-static pre-straining of material is not of primary importance to the additionally useful *** observations will enable to develop forming operations that take advantage of this improvement in formability,and will also enable the use of a quasi-static preform fairly close to the quasi-static forming limits without weakening its total formability for design of an EMAS process in shaping large aluminum shell parts like auto body panels.

关键词： electromagnetically assisted sheet metal stamping(EMAS) aluminum alloy sheet electromagnetic forming(EMF) quasi-static-dynamic deformation

Parametric Anisotropic(p,q)-Neumann Problems

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Acta Mathematicae Applicatae Sinica 2023年第4期39卷 926-942页

作者： Zhen-hai liu Nikolaos S.PAPAGEORGIOU Center for Applied Mathematics of Guangxi Yulin Normal UniversityYulin 537000China Guangxi Key Laboratory of Universities Optimization Control and Engineering Calculation Guangxi Minzu UniversityNanning 530006China Department of Mathematics National Technical UniversityZografou Campus15780 AthensGreece

We consider a Neumann problem driven by a(p(z), q(z))-Laplacian(anisotropic problem) plus a parametric potential term with λ > 0 being the parameter. The reaction is superlinear but need not satisfy the Ambrosetti-Rabinowitz condition. We prove a bifurcation-type theorem describing the changes in the set of positive solutions as the parameter λ moves on R_(+)=(0,+∞).

关键词： variable exponent spaces superlinear reaction bifurcation-type theorem anisotropic regularity strong comparison positive solutions