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Search Results: 1 - 10 of 46660 matches for " Di LU "
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Relevant Enzymes, Genes and Regulation Mechanisms in Biosynthesis Pathway of Stilbenes  [PDF]
Di LU, Wei ZHAO, Shujin ZHAO
Open Journal of Medicinal Chemistry (OJMC) , 2012, DOI: 10.4236/ojmc.2012.22003
Abstract: Stilbenes are natural phenolic compounds which function as antimicrobial phytoalexins in plants and affect human health as cardioprotective, antibaceteria, antioxidative and antineoplastic agents. In this review, the progresses of study on relevant enzymes, genes, and regulation mechanism in biosynthesis pathway of stilbenes are described. Here we introduce a holistic and systematic method of researching relevant enzymes, genes and other regulatory factors in biosynthesis pathway of stilbenes—Systems biology. The application of knowledge of relative enzymes, genes and regulation mechanisms in stilbenes biosynthesis in metabolic engineering which is used as a tool of improving the disease resistance of plants and health caring quality of crops is also discussed.

by LU Jinsheng,DI Xiuxuan,

金属学报 , 1983,
Abstract: An improved method for the quantitative X-ray phase analysis is developed. The reference intensity ratio is first calculated theoretically, then modified by the analogue specimens with the true physical state and the testing conditions including microabsorption, preferred orientation, monochromator and automatic divergence slit. Thus, its accuracy can be much improved. Result of experiment showed that this modification is available for those samples which are hard to analyse by conventional method if their crystalline structure parameters associated with the phase are given. It may be also used to verify the accuracy of the reference intensity ratio measurement and to judge by what reason the error caused.
Contraction and incremental stability of switched Carathéodory systems using multiple norms
Wenlian Lu,Mario di Bernardo
Mathematics , 2015,
Abstract: In this paper, incremental exponential asymptotic stability of a class of switched Caratheodory nonlinear systems is studied based on a novel concept of matrix measure of switched matrices via multiple norms and the transaction coefficients between these norms. This model is rather general and include the case of staircase function of switching signal as a special case. Thus, sufficient conditions are derived for incremental stability. In particular, these conditions allow that the system is incrementally exponential asymptotically stable even if some subsystem is unstable in some time periods. As applications and extensions, asymptotic periodicity and networked systems are investigated by the methodology of matrix measure of multiple norms.
Stochastic Geometry Modeling of Cellular Networks: Analysis, Simulation and Experimental Validation
Wei Lu,Marco Di Renzo
Mathematics , 2015,
Abstract: Due to the increasing heterogeneity and deployment density of emerging cellular networks, new flexible and scalable approaches for their modeling, simulation, analysis and optimization are needed. Recently, a new approach has been proposed: it is based on the theory of point processes and it leverages tools from stochastic geometry for tractable system-level modeling, performance evaluation and optimization. In this paper, we investigate the accuracy of this emerging abstraction for modeling cellular networks, by explicitly taking realistic base station locations, building footprints, spatial blockages and antenna radiation patterns into account. More specifically, the base station locations and the building footprints are taken from two publicly available databases from the United Kingdom. Our study confirms that the abstraction model based on stochastic geometry is capable of accurately modeling the communication performance of cellular networks in dense urban environments.

Zu Di LU,

系统科学与数学 , 1997,
Abstract: By 2], it is known that the higher-order moment structure is necessary for the moment estimation of doubly stochastic AR-MA models. In this paper, for the fourthorder stationary solution, {xt}, of AR(1)-MA(q) model, it is proved that the auto-covariance structure of {x~2_t} is of AREA(3q, 3q - 1) type. On the bests of 10] and this paper, the moment estimate of the model may be constructed.
Slow Light in Artificial Hybrid Molecules
Zhien Lu,Ka-di Zhu
Physics , 2008,
Abstract: The optical properties of hybrid molecules composed of semiconductor and metal nanoparticles with a weak probe in a strong pump field are investigated theoretically. Excitons in such a hybrid molecule demonstrate novel optical properties due to the coupling between exciton and plasmon. It is shown that a non-absorption hole induced by coherent population oscillation appears at the absorption spectrum of the probe field and there exists slow light effect resulting in the great change of the refractive index. The numerical results indicate that with the different center-to-center distance between the two nanopaticles the slow light effects are greatly modified in terms of exciton-plasmon couplings.
Uniqueness and short time regularity of the weak K?hler-Ricci flow
Eleonora Di Nezza,Chinh H. Lu
Mathematics , 2014,
Abstract: Let $X$ be a compact K\"ahler manifold. We prove that the K\"ahler-Ricci flow starting from arbitrary closed positive $(1,1)$-currents is smooth outside some analytic subset. This regularity result is optimal meaning that the flow has positive Lelong numbers for short time if the initial current does. We also prove that the flow is unique when starting from currents with zero Lelong numbers.
Complex Monge-Ampère equations on quasi-projective varieties
Eleonora Di Nezza,Chinh H. Lu
Mathematics , 2014,
Abstract: We introduce generalized Monge-Amp\`ere capacities and use these to study complex Monge-Amp\`ere equations whose right-hand side is smooth outside a divisor. We prove, in many cases, that there exists a unique normalized solution which is smooth outside the divisor.
Generalized Monge-Ampère capacities
Eleonora Di Nezza,Chinh H. Lu
Mathematics , 2014,
Abstract: We study various capacities on compact K\"{a}hler manifolds which generalize the Bedford-Taylor Monge-Amp\`ere capacity. We then use these capacities to study the existence and the regularity of solutions of complex Monge-Amp\`ere equations.
A note on algebraic Riccati equations associated with reducible singular M-matrices
Di Lu,Chun-Hua Guo
Mathematics , 2015,
Abstract: We prove a conjecture about the minimal nonnegative solutions of algebraic Riccati equations associated with reducible singular M-matrices. The result enhances our understanding of the behaviour of doubling algorithms for finding the minimal nonnegative solutions.
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