共查询到20条相似文献，搜索用时 31 毫秒
1.
Batch processes have been increasingly used in the production of low volume and high value added products. Consequently, optimization
control in batch processes is crucial in order to derive the maximum benefit. In this paper, a run-to-run product quality
control based on iterative learning optimization control is developed. Moreover, a rigorous theorem is proposed and proven
in this paper, which states that the tracking error under the optimal iterative learning control (ILC) law can converge to
zero. In this paper, a typical nonlinear batch continuous stirred tank reactor (CSTR) is considered, and the results show
that the performance of trajectory tracking is gradually improved by the ILC.
Project supported by the Science Foundation of Shanghai Municipal Education Commission (Grant No.09Y208), and the Science
Foundation of Science and Technology Commission of Shanghai Municipality (Grant Nos.08DZ2272400, 09DZ2273400) and the “11th
Five-Year Plan” 211 Construction Project of Shanghai University 相似文献
2.
The dilaton in Weyl-Scale induced gravitational theory is regarded as a candidate of dark energy. When the potential of dilaton field is taken as the form Wσ ＋ σ^2e^-βσ2, that there exist attractor solutions to the canonical dilatonic dark energy model and the phontam model, and these attractors correspond to an equation of state ω = -1 and a cosmic density parameter Ωσ = 1, which are important features for a dark energy model and can fit with the current observations. We find a sufficient condition of the existence of a late time de Sitter attractor. The attractor behaviors, the evolutions of the state parameter ω and the cosmic density parameter Ω, the evolution of X （σ/σ0） and Y （σ/σ0^2） with respect to N（ln a）are shown numerically. 相似文献
3.
Stabilization for a class of second-order switched systems with saturation constrains 总被引：1，自引：0，他引：1
This paper proposes a global stabilization method for a class of planar switched systems with input saturation constrains
by using a state feedback and switching strategy. This method is proved to be effective by analyzing the characteristics of
the trajectory of second-order linear systems with input saturation.
Project supported by the China Postdoctoral Science Foundation (Grant No.20070420643), the National Natural Science Foundation
of China (Grant No.60774059), and the Innovation Program of the Shanghai Municipal Science and Technology Commission (Grant
No.08DZ2272400) 相似文献
4.
For an arbitrary subset P of the reals, a function f ： V →P is defined to be a P-dominating function of a graph G = （V, E） if the sum of its function values over any closed neighbourhood is at least 1. That is, for every v ∈ V, f（N[v]） ≥ 1. The definition of total P-dominating function is obtained by simply changing ‘closed＇ neighborhood N[v] in the definition of P-dominating function to ‘open＇ neighborhood N（v）. The （total） P-domination number of a graph G is defined to be the infimum of weight w（f） = ∑v ∈ V f（v） taken over all （total） P-dominating function f. Similarly, the P-edge and P-star dominating functions can be defined. In this paper we survey some recent progress on the topic of dominating functions in graph theory. Especially, we are interested in P-, P-edge and P-star dominating functions of graphs with integer values. 相似文献
5.
In this paper, we discuss a class of piecewise linear hyperbolic maps on the 2-torus. These maps arise in the second-order digital fdter with two＇ s complement arithmetic. By introducing codings underlying the map operations, we give some admissibility conditions for symbolic sequences and find some periodic properties of these symbolic sequences. Then we use these conditions to check the admissibility of periodic symbol sequences. 相似文献
6.
Fluorescence properties of Eu^3 :Y2SiO5 have been investigated.Transitions between ^5D and ^7Fwere were studied with transmission spectra,fluorescence spectra,photoluminescence excitation(or absorption) spectra and site selective fluorescence spectra.The X-ray powder diffraction pattern of Eu^3 :Y2SiO5 shows that the crystal belong to monoclinic,and lattice‘s constants a,b,c and β arc obtaned by a simulation with the measured diffraction angles. 相似文献
7.
Two types of molecular and polymer devices employing (2-(4′-biphenyl)-5-(4““““““““-tert-butylphenyl)-1,3,4-oxadiazole) (PBD)and poly(N-vinylcarbazole) (PVK) as electron transport and hole transport materials, respectively, have been fabricated. The structures of these two devices are ITO/PVK( 70 nm)/PBD(60 nm)/A1 and ITO/PVK: PBD (1:1 by mass, 70 nm)/A1. The formation of exciplex is evident by comparing the electroluminescence (EL) of a bi-layer device and the photoluminescence (PL) of a PVK and PBD mixed film.The maximum emission energy of exciplex evaluated is consistent with the peak emission of EL. Blue emissions from both devices are obtained. The type of exicplex is interpreted based on the energy level diagram of the bi-layer device. 相似文献
8.
This paper presents a new elasticity and finite element formulation for different Young‘s modulus when tension and compression loadings in anisotropy meida.The case studies,such as anisotropy and isotropy,were invertigated.A numerical example was shown to find out the changes of neutral axis at the pure bending beams. 相似文献
9.
Based on the traditional theory of fracture, time-dependence of rock fracture is taken into account and the creep fracture
criteria are given. The effect of the microcrack zone on fracture toughness is analyzed. Finally, a model for time prediction
of rheological fracture is derived and its feasibility is proven.
Supported by the National Natural Science Foundation of China (59809005) and the Science Foundation of Shanghai Municipal
Commission of Science and Technology (96QF14009) 相似文献
10.
Let Bnp={x ∈ Rn‖|x ‖p≤l} be the unit ball ofp norm in the n-dimensional normed space p. The formula for the volume of Bnp was obtained and its asymptotic properties were found out as n→∞and p→∞. 相似文献
11.
Single phase Fe5C2 intermetallic compound was prepared by mechanical alloying method. The phase and crystal structure of sample were analyzed with X-ray differaction spectrum. The decomposing temperature of the Fe5C2 compound is 596.4℃ determined by the DSC curve. It is further shown that the size of nanometer crystal grain is an important condition for carrying out the solid state reaction at room temperature and normal pressure. 相似文献
12.
The nonlinear Riemann problems were converted into nonlinear singular integral equations and the existence of the solution for the problem was proved by means of contract principle. 相似文献
13.
In this paper, a class of strongly non-linear generalised Riemann-Hilbert problems for second-order elliptic system is studied.
By means of the theory of integral equations and using an explicit form of the solution, a reduction is made to a nonlinear
boundary value problem for two holomorphic functions. And using an approximation dealing with a solvable perturbed problems
and suitable prior estimates, we prove that the problems possess solution in Hardy class, the solution w(z) belongs to
, p>2.
Project supported by the National Natural Science Foundation of China (19671056) and Shanghai Scientific Foundation (96ZA14020) 相似文献
14.
SHI Yao ming XU Shi Yue CHEN Hang de 《上海大学学报(英文版)》1999,3(4):274-278
１ Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｒｅｃｅｎｔｌｙ,ａｓｅｒｉｅｓｏｆｅｘｐｅｒｉｍｅｎｔｓｂｙＹａｃｏｂｙｅｔａｌ．［１］ａｎｄＢｕｋｓｅｔａｌ．［２］ｒｅｐｏｒｔｅｄｓｏｍｅｍｅａｓｕｒｅｍｅｎｔｓｏｆｅｌｅｃｔｒｏｎｔｒａｎｓｍｉｓｓｉｏｎｐｈａｓｅｉｎｒｅｓｏｎａｎｔｔｕｎｎｅｌｉｎｇｔｈｒｏｕｇｈａｑｕａｎｔｕｍｄｏｔ（ＱＤ）ｗｈｉｃｈｉｓｉｎｓｅｒｔｅｄｉｎｔｏｏｎｅａｒｍｏｆａｎＡｈａｒｏｎｏｖＢｏｈｍ（ＡＢ）ｒｉｎｇ．ＴｈｅｃｏｎｄｕｃｔａｎｃｅｔｈｒｏｕｇｈｔｈｅＡＢｒｉｎｇｗ… 相似文献
15.
In this paper, the conditions of modified melaminc-fotmaldchyde resin (MF) used for a flocculent such as the ratio of reactant,
reaction time, reaction temperature and the value of pi I, were studied. The preferable synthetic conditions were melamine:formaldehyde:
acrylamide (mole)=1:5:(2∼3), reaction temperature 70°C, reaction time 4 h, pH9.0.
Supported by the Science Foundation of Shanghai Municipal Commission of Education (97A26) 相似文献
16.
SHENGPing－xing 《上海大学学报(英文版)》2001,5(2):96-103
This paper deals with Hilbert‘s 16th problem and its generalizations.The configurations of all closed branches of an algebraic curve of degreee n are discussed.The maximum number of sheets for an algebraic equation of degree n and the maximum number of limit cycles for a planar algebraic autonomous system are achieved.The author also considers different generalizations and some related problems. 相似文献
17.
In the light of Ф-mapping method and the relationship between entropy and the Euler characteristic, the intrinsic topological structure of entropy of Kerr black holes is studied. From the Ganss-Bonnet-Chem theorem, it is shown that the entropy of Kerr black hole is determined by singularities of the Killing vector field of spacetime. These singularities naturally carry topological numbers, Hopf indices and Brouwer degrees, which can also be viewed as topological quantization of entropy of Kerr black holes. Specific results S = A/4 for non-extreme Kerr black holes and S = 0 for extreme ones are calculated independently by using the above-mentioned methods. 相似文献
18.
粘弹性开敞浅壳的动力学性质 总被引：1，自引：0，他引：1
On the basis of the Kármán-Donnell theory of thin shells with large deflections and the Boltzmann laws for linear viscoelastic
materials, the mathematical model for viscoelastic open shallow shells was formulated. By using the Galerkin average method,
the original integro-partial-differential dynamic system was simplified as a integro-ordinary-differential dynamic system,
which can be transformed into a ordinary differential dynamic system by introducing new variables. The dynamical behavior
was studied by some classical methods. Dynamical properties, such as, chaos, strange attractor, limit cycle etc., were discovered.
Supported by the Development Foundation of Shanghai Municipal Commission of Education (99A01) 相似文献
19.
Ding-hua Xu 《上海大学学报(英文版)》2000,4(4):284-287
This paper deals with a parabolic system in a multi-dimentional bounded domain Ω⊂R
n with the smooth boundary δΩ. We discuss an inverse parabolic problem of determining the indirectly measurable internal heat distribution at any intermediate
moment from the heat distribution measurements in arbitrary accessible subdomain ω⊂Ω at some time-interval. Our main result is the Holder stability estimate in the inverse problem and the proof is completed
with a Carleman estimate and a eigenfunction expansion for parabolic equations.
Supported by the Natural Science Foundation of Jiangxi Province Government (981102) and the Natural Science Foundation of
Shanghai Municipal Commission (99ZA14030) 相似文献
20.
The room temperature tensile properties of cold-rolled and annealed Fe3(Al,Cr,Zr) alloy are similar to those of warm-rolled Fe3Al alloys. The cold-rolled Fe3(Al,Cr,Zr) alloy is also susceptible to test environments. It has been shown that the ductility in various environments decreases
in sequence of oxygen-oil-air-distilled water. The results of X-ray diffraction analysis show that (211) preferred orientation
of B2 phase appears in cold-rolled Fe3(Al,Cr,Zr) alloy after recrystallization annealing.
Supported by the National Natural Science Foundation of China (59895157) and the Natural Science Foundation of Shanghai Municipal
Commission of Science and Technology (98ZE14020) 相似文献