排序方式: 共有35条查询结果,搜索用时 15 毫秒
1.
Models for weather and climate prediction are complex, and each
model typi-cally has at least a small number of phenomena that are
poorly represented, such as perhaps the Madden-Julian Oscillation
(MJO for short) or El Ni\~{n}o-Southern Oscillation (ENSO for short)
or sea ice. Furthermore, it is often a very challenging task to
modify and improve a complex model without creating new
deficiencies. On the other hand, it is sometimes possible to design
a low-dimensional model for a particular phenomenon, such as the MJO
or ENSO, with significant skill, although the model may not
represent the dynamics of the full weather-climate system. Here a
strategy is proposed to mitigate these model errors by taking
advantage of each model''s strengths. The strategy involves
inter-model data assimilation, during a forecast simulation, whereby
models can exchange information in order to obtain more faithful
representations of the full weather-climate system. As an initial
investigation, the method is examined here using a simplified
scenario of linear models, involving a system of stochastic partial
differential equations (SPDEs for short) as an imperfect tropical
climate model and stochastic differential equations (SDEs for short)
as a low-dimensional model for the MJO. It is shown that the MJO
prediction skill of the imperfect climate model can be enhanced to
equal the predictive skill of the low-dimensional model. Such an
approach could provide a route to improving global model forecasts
in a minimally invasive way, with modifications to the prediction
system but without modifying the complex global physical model
itself. 相似文献
2.
3.
It is shown that an n × n matrix of continuous linear maps from a pro-C^*-algebra A to L(H), which verifies the condition of complete positivity, is of the form [V^*TijФ(·)V]^n i,where Ф is a representation of A on a Hilbert space K, V is a bounded linear operator from H to K, and j=1,[Tij]^n i,j=1 is a positive element in the C^*-algebra of all n×n matrices over the commutant of Ф(A) in L(K). This generalizes a result of C. Y.Suen in Proc. Amer. Math. Soc., 112(3), 1991, 709-712. Also, a covariant version of this construction is given. 相似文献
4.
Bo Chen Fangyue Chen Junbiao Guan Genaro J. Mart ''{ i}nez 《Journal of Applied Analysis & Computation》2016,6(4):1164-1179
By introducing a sequence-block transformation and vector-block transformation, we explore the dynamical properties of hybrid cellular automation (HCA) and hybrid cellular automation with memory (HCAM) in the framework of symbolic dynamics. As the local evolution rules of HCA and HCAM are not-uniform, the new uniform cellular automata (CAs) with multiple states are constructed by specifical the block transformations. Furthermore, because the new CA rules are topologically conjugate with the originals, the complex dynamics of the HCA and HCAM rules can be investigated via the new CA rules. 相似文献
5.
Existence of $\mu$-pseudo almost automorphic solutions to abstract partial neutral functional differential equations with infinite delay 下载免费PDF全文
Yong-Kui Chang G. M. N''Gu ''{e}r ''{e}kat Rui Zhang 《Journal of Applied Analysis & Computation》2016,6(3):628-664
In this article, we introduce and investigate the concept of $\mu$-Stepanov-like pseudo almost automorphic functions of class $h$ and class infinity via measure theory. We present new results on completeness and composition theorems for the space of such functions. To illustrate our main results, we provide some applications to an abstract partial neutral functional differential equation with infinite delay. 相似文献
6.
Most results on crossing numbers of graphs focus on some special graphs, such as the Cartesian products of small graphs with path, star and cycle. In this paper, we obtain the crossing number formula of Cartesian products of wheel Wm with path Pn, for arbitrary m ≥ 3 and n≥ 1. 相似文献
7.
A ring R is called orthogonal if for any two idempotents e and f in R, the condition that e and f are orthogonal in R implies the condition that [eR] and [fR] are orthogonal in K0(R)^+, i.e., [eR]∧[fR] = 0. In this paper, we shall prove that the K0-group of every orthogonal, IBN2 exchange ring is always torsion-free, which generalizes the main result in [3]. 相似文献
8.
This paper deals with the spatial vibration of an elastic string
with masses at the endpoints. The authors derive the corresponding
quasilinear wave equation with dynamical boundary conditions, and
prove the exact boundary controllability of this system by means of
a constructive method with modular structure. 相似文献
9.
分别采用共沉淀法和溶胶-凝胶法制备了Fe-V-O催化剂,用DTA-TG、TEM、XRD、IR和TPR等方法对微粒的组成、表面结构及晶格氧活性进行了表征.用化学吸附-IR和TPD方法考察了乙烷在Fe-V-O催化剂表面上的吸附性能.结果表明:溶胶-凝胶法制备的Fe-V-O催化剂为超细微粒,粒子大小为10-20nm,其比表面、晶格氧的活泼性均大于共沉法制备的Fe-V-O催化剂.乙烷能够以-CH3中的H原子吸附于催化剂表面Lewis碱位V=O链的端氧上形成两种分子吸附态,随吸附温度的升高,乙烷的吸附强度逐渐增大,其乙烷吸附量远大于共沉法制备的Fe-V-O催化剂. 相似文献
10.
通过正丁基锂(BL)引发甲基丙烯酰氧丙基纳米氧化硅(MAMSN)与苯乙烯共聚,制备了聚苯乙烯表面接枝纳米氧化硅(PS—g—Silica),并考察了正丁基锂加入量对苯乙烯转化率(C)、接枝率(PG)以及聚苯乙烯分子量(Mn)的影响。实验结果表明,阴离子聚合可以获得比自由基聚合更大的分子量和更高的转化率以及接枝率。 相似文献