共查询到20条相似文献,搜索用时 93 毫秒
1.
XIAO LING 《数学年刊B辑(英文版)》1995,(4)
LARGE-TIMEBEHMIOROFSOLUTIONSFORTHESYSTEMOFCOMPRESSIBLEADIABATICFLOWTHROUGHPOROUSMEDIA¥XIAOLING(L.HSIAO)D.SERRE(InstituteofMat... 相似文献
2.
A NECESSARY AND SUFFICIENT CONDITION OF EXISTENCE OF GLOBAL SOLUTIONS FOR SOME NONLINEAR HYPERBOLIC EQUATIONS 总被引:2,自引:0,他引:2
Zhang Quande 《数学年刊B辑(英文版)》1995,16(4):461-468
ANECESSARYANDSUFFICIENTCONDITIONOFEXISTENCEOFGLOBALSOLUTIONSFORSOMENONLINEARHYPERBOLICEQUATIONS¥ZHANGQUANDE(DepartmentofMathe... 相似文献
3.
FORCEDOSCILLATIONSOFHYPERBOLICDIFFERENTIALEQUATIONSWITHDEVIATINGARGUMENTSCUIBAOTONG(崔宝同)(BinzhouNormalCollege,Binzhou256604,C... 相似文献
4.
EXISTENCEANDUNIQUENESSOFSOLUTIONSFORNONLINEARBOUNDARYVALUEPROBLEMSOFVOLTERRA-HAMMERSTEINTYPEINTEGRODIFFERENTIALEQUATION¥WangG... 相似文献
5.
《高校应用数学学报(英文版)》1997,(1)
EXACTBOUNDSOFTHEMODIFIEDLPTALGORITHMSAPPLYINGTOPARALLELMACHINESSCHEDULINGWITHNONSIMULTANEOUSMACHINEAVAILABLETIMESLINGUOHUI,H... 相似文献
6.
ASYMPTOTICBEHAVIOROFNONOSCILLATORYSOLUTIONSOFASECONDORDERFUNCTIONALDIFFERENTIALEQUATIONS(孟繁伟)曲阜师范大学,邮编:273165MengFanwei(QufuN... 相似文献
7.
卢国富 《应用数学学报(英文版)》1996,(3)
EXISTENCEANDUNIQUENESSOFGLOBALSOLUTIONFORCERTAINNONLINEARDEGENERATEPARABOLIC SYSTEMSLUGUOFU(卢国富)(DepartmentofMathematics,Puti... 相似文献
8.
A NOTE OF UNIFORM EXPONENTIAL STABILIZATION FOR NONCONTRACTIVE SEMIGROUPS UNDER COMPACT PERTURBATION
宋国柱 《数学物理学报(B辑英文版)》1994,(1)
ANOTEOFUNIFORMEXPONENTIALSTABILIZATIONFORNONCONTRACTIVESEMIGROUPSUNDERCOMPACTPERTURBATIONSongGuozhu(宋国柱)(Dept.ofMath.,Nanjing... 相似文献
9.
BOUNDARYLAYERESTIMATIONOFASINGULARPROBLEMWITHLIMITEQUATIONOFORDER2HECHENG(何成)ZHANGWEITAO(张维弢)(InstituteofSystemsScience,Chine... 相似文献
10.
HOPFBIFURCATIONANDOTHERDYNAMICALBEHAVIORSFORAFOURTHORDERDIFFERENTIALEQUATIONINMODELSOFINFECTIOUSDISEASEJINGZHUJUN(井竹君)(Instit... 相似文献
11.
A. N. Vetokhin 《Differential Equations》2016,52(3):272-281
We consider parametric families of differential systems with coefficients that are bounded and continuous on the half-line and uniformly in time continuously depend on a real parameter. For each Lyapunov exponent, we construct a family such that the Lyapunov exponent of its systems treated as a function of the parameter is not a lower semicontinuous function for any value of the parameter. 相似文献
12.
A.P. Markeyev 《Journal of Applied Mathematics and Mechanics》2008,72(3):250-258
The stability in the first approximation of the rotation of a satellite about a centre of mass is investigated. In the unperturbed motion the satellite performs, in absolute space, three rotations around the normal to the orbital plane in a time equal to two periods of rotation of its centre of mass in the orbit (Mercury-type rotation). Three cases of such rotations are considered: the rotations of a dynamically symmetrical satellite and a satellite, the central ellipsoid of inertia of which is close to a sphere, in an elliptic orbit of arbitrary eccentricity, and the rotation of a satellite with three different principal central moments of inertia in a circular orbit. 相似文献
13.
Hazem Ali Attia 《Applied Mathematical Modelling》2005,29(12):1182-1195
This paper presents a two-step generation of the equations of motion of planar mechanisms using point and joint coordinates. First, the formulation replaces a rigid body by a dynamically equivalent constrained system of particles and uses Newton’s second law to study the motion of the particles without introducing any rotational coordinates. Then, the equations of motion are transformed to a reduced set in terms of selected relative joint variables using a velocity transformation matrix. For an open-chain, this process automatically eliminates all of the non-working constraint forces and leads to an efficient integration of the equations of motion. For a closed-chain, suitable joints should be cut and few cut-joints constraint equations are included. An example of a closed-chain is used to demonstrate the generality and efficiency of the proposed method. 相似文献
14.
In problems of topology and analysis, well-known theorem on the preservation by any continuous homotopy of the property of a mapping to have a fixed point and the property of a pair of mappings to have a coincidence point are extensively applied. Thus, for contraction mappings and some of their generalizations, Frigon’s results on the preservation of the property to have a fixed point by a homotopy of a special type are known. This paper presents theorems on the preservation by order homotopy of the property of a pair of mappings to have a coincidence point. As a corollary, conditions under which such a homotopy preserves the property of a mapping to have a fixed point are obtained. 相似文献
15.
Piotr Je¸drzejewicz 《代数通讯》2013,41(4):1500-1508
Let A be a UFD of characteristic p > 0, let 𝒵 be a set of some eigenvectors of a derivation of A. We prove, under some additional assumptions, a necessary and sufficient condition for 𝒵 to be a p-basis of the minimal ring of constants containing 𝒵. The main preparatory result is the unique decomposition theorem with respect to a factor from a given subalgebra containing Ap. 相似文献
16.
Olga Ziemiańska 《Journal of Pure and Applied Algebra》2012,216(2):456-467
A twisted diagram of groups assigns a group to every object of an indexing category and a homomorphism of groups to every morphism. However, it does not have to be completely functorial — it preserves composition only up to a compatible family of inner automorphisms. A. Haefliger defined a special case: the complex of groups. We prove that there exists a natural bijective correspondence between equivalence classes of epimorphisms of twisted diagrams of groups and elements of the second cohomology group of a certain small category. If this category is defined by a discrete group, then we obtain the well known classification of extensions of groups. 相似文献
17.
《Journal de Mathématiques Pures et Appliquées》2005,84(10):1427-1454
We consider a spectral problem for a system of second order (in the spectral parameter) abstract pencils in a Hilbert space and prove the completeness and the Abel basis property of a system of eigenvectors and associated vectors. In some special cases, we obtain the expansion of vectors with respect to eigenvectors. Further, it is considered a relevant application of these abstract results to boundary-value problems for second and fourth order ordinary differential equations with a quadratic spectral parameter both in the equation and in boundary-value conditions. 相似文献
18.
Takemi Yanagimoto David G. Hoel 《Annals of the Institute of Statistical Mathematics》1980,32(1):465-480
Summary Procedures to estimate a dose of which the incidence probability is very small (e.g. 10−6) have been developed to evaluate the safety of chemical compounds. To compare models for estimation of safe doses quantitatively,
a measure of the heaviness of tail of a distribution and a measure of tail at the origin are introduced. These measures have
a theoretical basis for the comparison of tail behavior between distributions. Using the two measures, a tail ordering is
defined to present a criterion for the comparison of models and is discussed for the probit, the logit, the Weibull, the (generalized)
multihit, the (generalized) multitarget and the multistage models.
The multistage model is most conservative among them, while the probit model has the reverse property. The Weibull model is
more conservative than the logit. The multihit and multitarget models are found to be more sensitive than the Weibull and
the logit.
The Institute of Statistical Mathematics National Institute of Environmental Health Sciences 相似文献
19.
M. S. Rybnikov 《Journal of Mathematical Sciences》1994,70(5):2028-2030
A mathematical model of space motion of a mechanical system that consists of a load and a parachute is presented. With the help of the apparatus of the Lyapunov functions, a particular case of the model is studied when the load can be considered as a mass point that does not have resistance. A sufficient condition of stability is obtained. The results can be applied to the model/ing and construction of parachute systems.Translated from Dinamicheskie Sistemy, No. 9, pp. 99–102, 1990. 相似文献
20.
Let G be a finite group, let π be a set of primes and let p be a prime. We characterize the existence of a normal Hall π‐subgroup in G in terms of the order of products of certain elements of G. This theorem generalizes a characterization of A. Moretó and the second author by using the orders of products of elements for those groups having a normal Sylow p‐subgroup 6 . As a consequence, we also give a π‐decomposability criterion for a finite group also by means of the orders of products. 相似文献