|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Hausdorff Operators on Function Spaces显示文摘The authors mainly study the Hausdorff operators on Euclidean space R^n. They establish boundedness of the Hausdorff operators in various function spaces, such as Lebesgue spaces, Hardy spaces, local Hardy spaces and Herz type spaces. The results reveal that the Hausdorff operators have better performance on the Herz type Hardy spaces H Kα,pq (R^n) than their performance on the Hardy spaces H^p(R^n) when 0 < p < 1. Also, the authors obtain some new results and reprove or generalize some known results for the high dimensional Hardy operator and adjoint Hardy operator. | Jiecheng CHEN Dashan FAN Jun LI | 2012 | Chinese Annals of Mathematics,Series B2012，33，4： | 23 |
| 2 | Best constants for Hausdorf operators on n-dimensional product spaces显示文摘In this paper,we study certain Hausdorf operators in the high-dimensional product spaces.We obtain their power weighted boundedness from Lpto Lqand characterize the necessary and sufcient conditions for their boundedness on the power weighted Lpspaces.Moreover,in the case p=q,we obtain the sharp bound constants. | WU XiaoMei CHEN JieCheng | 2014 | Science China Mathematics2014，57，3： | 13 |
| 3 | Boundedness of Hausdorff operators on Lebesgue spaces and Hardy spaces显示文摘In this paper, we study the boundedness of the Hausdorff operator H_? on the real line R. First, we start with an easy case by establishing the boundedness of the Hausdorff operator on the Lebesgue space L^p(R)and the Hardy space H^1(R). The key idea is to reformulate H_? as a Calder′on-Zygmund convolution operator,from which its boundedness is proved by verifying the Hrmander condition of the convolution kernel. Secondly,to prove the boundedness on the Hardy space H^p(R) with 0 < p < 1, we rewrite the Hausdorff operator as a singular integral operator with the non-convolution kernel. This novel reformulation, in combination with the Taibleson-Weiss molecular characterization of H^p(R) spaces, enables us to obtain the desired results. Those results significantly extend the known boundedness of the Hausdorff operator on H^1(R). | Jiecheng Chen Jiawei Dai Dashan Fan Xiangrong Zhu | 2018 | Science China Mathematics2018，61，9： | 5 |
| 4 | A general strategy for one-step fabrication of biocompatible microcapsules with controlled active release显示文摘Fabrication of biocompatible core-shell microcapsules in a controllable and scalable manner remains an important but challenging task.Here,we develop a one-step microfluidic approach for the highthroughput production of biocompatible microcapsules,which utilizes single emulsions as templates and controls the precipitation of biocompatible polymer at the water/oil interface.The facile method enables the loading of various oils in the core and the enhancement of polymer shell strength by polyelectrolyte coating.The resulting microcapsules have the advantages of controllability,scalability,biocompatibility,high encapsulation efficiency and high loading capacity.The core-shell microcapsules are ideal delivery vehicles for programmable active release and various controlled release mechanisms are demonstrated,including burst release by vigorous shaking,pH-triggered release for targeted intestinal release and sustained release of perfume over a long period of time.The utility of our technique paves the way for practical applications of core-shell microcapsules. | Zeyong Sun Chenjing Yang Max Eggersdorfer Jiecheng Cuic Yiwei Li Mingtan Hai Dong Chen David AWeitz | 2020 | Chinese Chemical Letters2020，31，1： | 5 |
| 5 | Littlewood-Paley operators with variable kernels显示文摘In this paper we study a certain directional Hilbert transform and the boundedness on some mixed norm spaces. As one of applications, we prove the Lp-boundedness of the Littlewood-Paley operators with variable kernels. Our results are extensions of some known theorems. | CHEN Jiecheng, DING Yong & FAN Dashan Department of Mathematics, Zhejiang University (Xixi Campus), Hangzhou 310028, China School of Mathematical Sciences, Beijing Normal University, Beijing 100875, China Department of Mathematics, University of Wisconsin-Milwaukee, Milwaukee WI 53201, USA Department of Mathematics, Central China Normal University, Wuhan 430074, China | 2006 | Science China Mathematics2006，49，5： | 4 |
| 6 | Estimates for wave and Klein-Gordon equations on modulation spaces显示文摘We prove that the fundamental semi-group eit(m 2I+|Δ|)1/2(m = 0) of the Klein-Gordon equation is bounded on the modulation space M ps,q(Rn) for all 0 < p,q ∞ and s ∈ R.Similarly,we prove that the wave semi-group eit|Δ|1/2 is bounded on the Hardy type modulation spaces μsp,q(Rn) for all 0 < p,q ∞,and s ∈ R.All the bounds have an asymptotic factor tn|1/p 1/2| as t goes to the infinity.These results extend some known results for the case of p 1.Also,some applications for the Cauchy problems related to the semi-group eit(m2I+|Δ|)1/2 are obtained.Finally we discuss the optimum of the factor tn|1/p 1/2| and raise some unsolved problems. | CHEN JieCheng FAN DaShan | 2012 | Science China Mathematics2012，55，10： | 4 |
| 7 | Grassland Degradation and Its Control in Region AroundQinghai Lake显示文摘A quite severe degradation was found in all seven types of grasslands in the study area involving 12counties of the northwestern Qinghai Province. The slightly, moderately and severely degraded grasslandsoccupied 49.7%, 32.0% and 18.3% of the area respectively. The major factors resulting in the degradationwere overgrazing, the damages from mice and grasshopper and blown sands, and improper use of grasslands.The measures to deal with these problems should be: 1) to make livestock development in accordancewith grassland carrying capacity for animals; 2) to build more artificial grasslands with a stable and highergraas yield; 3) to put more widely the rotation grazing system into practice; 4) to clear up the poisonousgrass species; and 5) to adopt more effective measures to deal with the damages to grasslands by mice andgrasshoppers. | JIANG JIANJUN NI SHAOXIANG GONG AIQI WANG WEIJUN ZHA YONG WANG JIECHENG F. VOSS(l College of Geographic Science, Nanjing Normal University, Nanjing 210097 (China))(2 General Grassland Station of Qinghai Province, Xining 810001 (China))(3 Institute of Ceog | 1999 | Pedosphere1999，9，4： | 4 |
| 8 | Three-dimensional DEM-CFD analysis of air-flow-induced detachment of API particles from carrier particles in dry powder inhalers显示文摘Air flow and particle-particle/wall impacts are considered as two primary dispersion mechanisms for dry powder inhalers(DPIs).Hence,an understanding of these mechanisms is critical for the development of DPIs.In this study,a coupled DEM-CFD(discrete element method-computational fluid dynamics)is employed to investigate the influence of air flow on the dispersion performance of the carrier-based DPI formulations.A carrier-based agglomerate is initially formed and then dispersed in a uniformed air flow.It is found that air flow can drag API particles away from the carrier and those in the downstream air flow regions are prone to be dispersed.Furthermore,the influence of the air velocity and work of adhesion are also examined.It is shown that the dispersion number(i.e.,the number of API particles detached from the carrier)increases with increasing air velocity,and decreases with increasing the work of adhesion,indicating that the DPI performance is controlled by the balance of the removal and adhesive forces.It is also shown that the cumulative Weibull distribution function can be used to describe the DPI performance,which is governed by the ratio of the fluid drag force to the pull-off force. | Jiecheng Yang Chuan-Yu Wu Michael Adams | 2014 | Acta Pharmaceutica Sinica B2014，4，1： | 4 |
| 9 | MAXIMAL CALDERóN-ZYGMUND SINGULAR INTEGRAL ON RBMO显示文摘Given a positive Radon measure μ on Rdsatisfying the linear growth conditionμ(B(x,r))≤C 0r n,x∈R d,r>0,(1)where n is a fixed number and 0 | Chen Jiecheng Zhu Xiangrong | 2005 | Applied Mathematics(A Journal of Chinese Universities)2005，20，3： | 4 |
| 10 | The recent advances in constructing designed electrode in lithium metal batteries显示文摘Lithium metal battery, one of the most promising candidates for high-energy-density storage system, has attracted extensive interest due to its extremely high theoretical specific capacity, low gravimetric density and lowest negative redox potential. However, the formation of lithium dendrites, uncontrolled interfacial reactions, and huge volume change during the cycles of charging and discharging lower the Coulombic efficiency and cause harsh safety issues; they are the major hurdles towards the practical applications of lithium metal batteries. This review presents the recent advances in lithium metal battery and focuses on the functional hybrid electrodes, which are constructed to boost the electrochemical performance of metallic lithium and suppress the growth of lithium dendrites. Their general design rules,fabrication strategies, enhanced performances, and potential applications are summarized and analyzed.An outlook of the challenges and the potentials of lithium metal battery is also provided, which facilitates the future development of lithium metal | Jiecheng Cui Tian-Guang Zhan Kang-Da Zhang Dong Chen | 2017 | Chinese Chemical Letters2017，28，12： | 4 |
| 11 | Modulation space estimates for the fractional integral operators显示文摘We obtain the boundedness for the fractional integral operators from the modulation Hardy space μp,q to the modulation Hardy space μr,q for all 0 < p < ∞. The result is an extension of the known result for the case 1 < p < ∞ and it contains a larger range of r than those in the classical result of the Lp → Lr boundedness in the Lebesgue spaces. We also obtain some estimates on the modulation spaces for the bilinear fractional operators. | ZHONG Yong CHEN JieCheng | 2011 | Science China Mathematics2011，54，7： | 3 |
| 12 | CFD-DEM simulation of three-dimensional aeolian sand movement显示文摘A three-dimensional CFD-DEM model is proposed to investigate the aeolian sand movement.The results show that the mean particle horizontal velocity can be expressed by a power function of heights.The probability distribution of the impact and lift-off velocities of particles can be described by a log-normal function,and that of the impact and lift-off angles can be expressed by an exponential function.The probability distribution of particle horizontal velocity at different heights can be described as a lognormal function,while the probability distribution of longitudinal and vertical velocity can be described as a normal function.The comparison with previous two-dimensional calculations shows that the variations of mean particle horizontal velocity along the heights in two-dimensional and three-dimensional models are similar.However,the mean particle density of the two-dimensional model is larger than that in reality,which will result in the overestimation of sand transportation rate in the two-dimensional calculation.The study also shows that the predicted probability distributions of particle velocities are in good agreement with the experimental results. | YANG JieCheng,ZHANG Yu *,LIU DaYou & WEI XiaoLin Key Laboratory of Environmental Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，7： | 3 |
| 13 | A CLASS OF OSCILLATORY SINGULAR INTEGRALS ON TRIEBEL-LIZORKIN SPACES显示文摘. The boundedness on Triebel-Lizorkin spaces of oscillatory singular integral operator T in the form e i|x|a Ω(x)|x| -n is studied,where a∈R,a≠0,1 and Ω∈L1(S n-1 ) is homogeneous of degree zero and satisfies certain cancellation condition.When kernel Ω(x′)∈Llog+L(S n-1 ),the α,q _ p (Rn) boundedness of the above operator is obtained.Meanwhile,when Ω(x) satisfies L1-Dini condition,the above operator T is bounded on 0,1 _ 1 (Rn). | Jiang Liya Chen Jiecheng | 2006 | Applied Mathematics(A Journal of Chinese Universities)2006，21，1： | 3 |
| 14 | Singular integral operators on product Triebel-Lizorkin spaces显示文摘In this paper, we consider the rough singular integral operators on product Triebel-Lizorkin spaces and prove certain boundedness properties on the Triebel-Lizorkin spaces. We also use the same method to study the fractional integral operator and the Littlewood-Paley functions. The results extend some known results. | Chen JieCheng Wang Hui | 2010 | Science China Mathematics2010，53，2： | 3 |
| 15 | Sand storms:CFD analysis of Reynolds stress and collision stress of particles near sand bed显示文摘Sand storm is a serious environmental threat to humans.Sand particles are transported by saltation and suspension,causing soil erosion in one place and deposition in another.In order to prevent and predict sand storms,the causes and the manners of particle motions must be studied in detail.In this paper a standard k-ε model is used for the gas phase simulation and the discrete element method(DEM) is used to predict the movements of particles using an in-house procedure.The data are summarized in an Eulerian-Eulerian regime after simulation to get the statistical particle Reynolds stress and particle collision stress.The results show that for the current case the Reynolds stress and the air shear stress predominate in the region 20-250 mm above the initial sand bed surface.However,in the region below 3 mm,the collision stress must be taken into account in predicting particle movement. | Yu Zhang Jiecheng Yang Dayou Liu Xiaolin Wei Lixin Yu | 2010 | Particuology2010，8，4： | 2 |
| 16 | SOME ROUGH OPERATORS ON PRODUCT SPACES显示文摘In this survery report,we shall mainly summarize some recent progress,interesting problems and typi- cal methods used in the theory related to rough Marcinkiewicz integrals and rough singular integrals on product spaces .Inaddition, we give new proofs for some known results. | Chen Jiecheng and Wang Silei (Zhejiang University, China) | 2001 | Analysis in Theory and Applications2001，17，1： | 2 |
| 17 | The Cauchy Integral Operator on Weighted Hardy Space显示文摘The authors show that the Cauchy integral operator is bounded from Hωp(R1) to hωp(R1) (the weighted local Hardy space). To prove the results, a kind of generalized atoms is introduced and a variant of weighted 'Tb theorem' is considered. | Jianmiao RUAN Jiecheng CHEN | 2010 | Chinese Annals of Mathematics,Series B2010，31，4： | 2 |
| 18 | Adenovirus-mediated co-expression of ING4 and PTEN cooperatively enhances their antitumor activity in human hepatocellular carcinoma cells显示文摘在染色体 10 上删除的生长 4 的禁止者(ING4 )(PTEN ) 和磷酸酶和 tensin 相当或相同的事物作为是的肿瘤 suppressors 众所周知仔细与肿瘤出现和前进有关。ING4 和 PTEN 在鼻咽的癌房间显示出 synergistic antitumor 活动,这被报导。二肿瘤 suppressors 在生长抑制和 apoptosis 激活上表明了 synergistic 效果。在这研究,我们在 hepatocellular 癌调查了他们的治疗学的潜力 ?(HCC ) 房间。Recombinant 侵入人体气管粘膜的病菌共同表示 ING4 和 PTEN (Ad-ING4-PTEN ) 被构造,并且 SMMC-7721 和 HepG2 HCC 房间上的 antitumor 效果被评估。Ad-ING4-PTEN 合作地禁止了房间生长,刺激了 apoptosis,并且压制了在 HCC 房间,和在 SMMC-7721 的调整房间周期的侵略。进一步的研究证明由 Ad-ING4-PTEN 的 ING4 和 PTEN 的联合合作地提高了房间的表示的改变周期相关的蛋白质( p53 , p21 ,和 cyclin D1 )和 apoptotic 因素(坏, Bcl-2 , Bcl-XL ,和 Bax ),它涉及房间周期的规定和 apoptotic 小径的激活,导致 synergistic antitumor 效果。这些结果显示 ING4 和 PTEN 的联合可以为 HCC 提供有效治疗学的策略。 | Nargis Rakshit Sijun Yang Wei Zhou Yi Xu Chenghui Deng Jiecheng Yang Huijun Yu Wenxiang Wei | 2016 | Acta Biochimica et Biophysica Sinica2016，48，8： | 2 |
| 19 | A REPRESENTATION THEOREM OF HARMONIC FUNCTIONS AND ITS APPLICATION TO BMO ON MANIFOLDS显示文摘In this paper a representation theorem of harmonic functions on manifolds is set up. As an application, a characterization of BMO in terms of Carleson measures is obtained. | Chen Jiecheng of Math.,Zhejiang Univ. (Xixi Campus), Hangzhou 310028. | 2001 | Applied Mathematics(A Journal of Chinese Universities)2001，16，3： | 2 |
| 20 | Oscillatory hyper Hilbert transforms along general curves显示文摘我们认为摆动的亢奋的 Hilbert 变换 H 是 ,, f (x)=0 f (x -(t)) e 它 -- t -(1+) dt;在哪儿(t)=(t,(t)) 在 2 是一条一般曲线。什么时候是凸的,我们给一个简单条件在上以便 H ,, 在 L 2 上被围住什么时候 > 3, > 0:作为推论,在这个条件下面,我们获得 H 的 L p -boundedness,, 什么时候 2/(2 - 3 ) p /(3 ) 。什么时候是一条一般 nonconvex 曲线,我们给一些更复杂的条件在上以便 H ,, 在 L 2 上被围住:作为一个应用程序,我们构造沿着 H 的严格地凸的曲线的一个类,, 在 L 2 上被围住仅当 > 2 > 0。 | Jiecheng CHEN Belay Mitiku DAMTEW Xiangrong ZHU | 2017 | Frontiers of Mathematics in China2017，12，2： | 2 |
您所在的机构暂未开通此部分的功能，请联系管理员