The present paper deals with the finite difference scheme with intrinsic parallelism for numerically solving the heat equation. In this procedure, the domain over which the problem is defined is divided into subdomains by introducing interface points. The interface values between subdomains are found by explicit formulas, once these values have been calculated, subdomain problems can be solved in paralledl. The stability conditions and maximum norm error estimates for these procedures have been derived, which demonstrate that our schemes have satisfactory stability and higher convergence order.

Given a C-Z operator T, which satisfies the Hormander Condition, it is proved that if T maps some special atoms to WL¹, then T is continuous from L^p to L^p(1 Related Articles | Metrics

A lattice Boltzamnn model for the Hamilton system is given. By controlling the parameters in the reaction-diffusion lattice Boltzmann model, we obtained the equilibrium distribution functions for the Hamilton system. As an example, we simulated the motion behavior of the pendulum.

The present paper deals with the association of the solution and lagrange multiplier of nonconvex hardly programmed for general nonconvex programming problems.

The present paper deals with the shear flow of Johnson-Segalman fluid. On the basis of the analysis of the steady state solutions, it is obtained that a steady-state solution of JS model corresponds to a point on the steady total stress curve at which the total stress is T(X). When T is sufficiently small or sufficiently large , there is a single steady state solution , while there are three steady state solutions when T is intermediate in value. The steady state solution is judged to be stable or unstable in phase plane in this paper. At last , a new numerical scheme is devised by using backward finite difference method to solve JS model.

This paper deals with the nonlinear oscillations of conservative single-degree-of-freedom systems with odd nonlinearity. By combining the linearization of the governing equation with the method of harmonic balance , we have established analytical approximate formulas for the period and the periodic solution. These formulas are valid for oscillations with small as well as large amplitude. It is illustrated by one example that the proposed formulas can give very satisfactory approximate results.

The present paper presents a minimal subshift which is distributionally chaotic in a sequence but it is not distributionally chaotic , furthermore , it is proved that generally distributional chaos in a sequence and distributional chaos are not equivalent on the measure center.

The present paper deals with the bivariate B-spline functions with integral definition on uniform type- Ⅰ triangulation and type-Ⅱ triangulation , and obtain the M-band refinement equations for any integer M(M ≥2). The result in this paper can sum up the subdivision of bivariate Box splines and bivariate B-splines with the minimal support. Furthermore , our method is simple and easy to be generalized.

For expansive flows with the shadowing property , we have studied some properties of chain recurrent sets. The results can be regarded as the generalization of the correspording conclusion of the homeomorphism.

In this paper an action calculus , having the expressing power for π-calculus , is defined , and the transition semantics of parallel object-oriented language is presented by translating every syntactic entity into the actions of the action calculus.

In the present paper the authors introduce an ant algorithm , a distributed algorithm for the solution of combinatorial optimization problems which has been inspired by the observation of real colonies of ants. Then the authors apply a hybrid approach of ant algorithm with 3-opt and cross-removing to the traveling salesman problem (TSP). The results show that it is able to find good solutions quickly.

The present paper deals with the problems of embedded workflow component in the aspects of process modeling , event driven mechanism , multiple application integration etc. A workflow model is proposed. The static model the describes the static element of the system (such as data , activity , organization ) , it is a relatively steady part in WFMS. The dynamic model describes the dynamic characteristic of the system (such as data flowing , control flowing , element relation and constraint , etc.) , it is often involved in business process optimization and reengineering. The workflow specification language is given , it formalizes the workflow model.

The present paper describes the application of ActiveX controller , and through the principle of creating and applying the controller of Delphi , summarize the distinction between controller and VCL component and , the advantage and defect of them. At last , we give a exemplar of controller in the multiclass discrete Web system.

The present paper covers the theoretical analysis and numerical computation of the acoustic wave in the fluid-model bore-hole and it cones to the significant conclusion that the full wave of the inner well consists of gliding p wave , normal wave and leaky wave. This paper demonstrates the existence of the normal mode , it has been made clear that there is not the normal mode under the situation of the fluid-solid mode of slow stratum , and the popularized conception of slow stratum has been obtained and the range and the rule of leaky mode existence have been found.

The influence of ball-milling on the discharge properties of TiFe alloy electrodes was investigated. The results show that (1) ball-milling treatment for a short time can clearly increase discharge capacity of as-cast TiFe alloy made by vacuum arc melting; (2) the capacity of ball-milling Ti-Fe solid resolution electrode , which contained a small portion of TiFe intermetallic compound , is greater than that of Ti-Fe arc-melting and ball-milling alloy electrode.

By means of the generalized Ginzburg-Landau-Devoshire (GLD) theory , the influence of the interface between two different materials with the second order transition on the properties of ferroelectric thin films with the step-type and slowly varying structures is studied.

The study of the Mossbauer spectrum of FeCrCoVTi permanent magnet alloy containing 1.5％W . The room temperature Mossbauer spectrum of this alloy consists of seven ferromagnetic and one paramagnetic sextet superposition . The seven ferromagnetic spectra belong to α1 phase in the alloy , the magnitude of their internal magnetic field is 309 kOe . The paramagnetic spectrum belongs to α2 phase in the alloy .

Iron nitride films were deposited on glass substrate by DC magnetron sputtering with mixed Ar／N2 as discharge (N2 fraction of 5％) and at different time ( 30 min , 20 min , 10 min , and 5 min , respectively ) . The composition of the films was analyzed by means of X-ray photoelectron spectroscopy experiment (XPS) . The layer phases and the surface morphologies of the films were characterized with the aid of grazing incidence X-ray scattering and X-ray diffraction as well as atomic force microscopy . For the film grown at N2 fraction of 5 ％ , the phase of FeN_0.056appeared . The surface of the films showed the selfaffine character . The values of roughness exponent α≈ 0.65 and growth exponent β≈ 0.53 are in agreement with the improvised KPZ exponents based on Kolmogorov's energy cascade concept .

We fabricated single layer photovoltaic devices with poly[2-methoxy-5-(2＇-ethyl-hexyloxy)-1,4-phenylene vinylene](MEH-PPV) and the photovoltaic properties of them were investigated .

Interleukin 2(IL-2) and its receptor(IL-2R) constitute one of the most extensively studied cytokine receptor systems. Thus ,we used MT-2 cells that could specifically express IL-2R α on the surface to screen a random hexa-peptide library and obtained the phage clones which had good combinative activities studied by Elisa. After DNA sequencing , three groups of relative peptide sequences were founded. The two groups were respectively similar to the sequence of IL-2(N-terminal) at amino acids 17-24 (LLLDLQMI) and the sequence of IL-2(C-terminal) at amino acids 114-124 (IVEFLNRW). In addition , the other group was similar to the motif (WSXWS) of IL-2R β,γ. Therefore ,it is inferred that these sequences might have mimicked the interaction site of IL-2 ／IL-2R and the binding site of IL-2R αand β,γ. Further the synthesized peptide(AIVEFLNRW) could inhibit the T lymphocyte proliferation. These results provided the basis for the research and the development of the small peptide immunosuppressant drugs.

The technique of the flow injection on-line separation and preconcentration with VS-Ⅱ type anion exchange fabric combined with flame atomic absorption spectrometry was used to determine the trace elements Pt , Pd , and Rh in complicated samples. The analyzed solution with acidity 3﹪(HCL) passed through the column at a flow rate of 4.8mL／min , the enrichment time was 40 s , Pt , Pd , and Rh on the column was eluted with thiourea at a flow rate of 2.0mL／min , and introduced into the nebulizer system of FAAS. The detection limit is 0.064 μg／mL for Pt , 0.074 μg／mL for Pd and 0.025 μg／mL for Rh , the relative standard deviation(n＝6) is less than 3﹪ , at least 55 samples can be analyzed in an hour. The method has been applied to determining trace Pt , Pd , and Rh in complicated samples with satisfactory results.

The photodegradation rate constants and the half-lives of phenol and aniline in the water of the Second Songhua River were determined by means of outdoor simulation experiments. The quantum yield of the photoreactions of aniline in the river water was determined also. On the basis of the quantum yield , the theory half-lives of the photodegradation of it were calculated , which were coincident with the actually determined values.

With sodium persulfate as the initiator and sodium hydrosulfite as the reducer , maleic anhydride and acrylic acid were copolymerized in an aqueous solution to synthesize the tittle copolymer , which can be used as STPP substitute in laundry powder. The weight ratio of maleic anhydride to acrylic acid was 1:2. The weight percentages of the initiator and the reducer to the monomers were respectively 4.0％ and 1.9％. The polymerization was carried out 90 oC for 1h. The production was a transparent liquid with a low viscosity and at light colour. It has good dispersivity and the chelating power was 518 mg CaCO3/g.

The adsorption thermodynamics of loam paddy soil to adsorb Cu , Ni , Pb and As were studied. The results show that the adsorption thermodynamics accords with Freundlich equation. The order of adsorb ability is Pb " Cu ＞ As ＞ Ni. The adsorbing ability is not affected by the coexisting elements. According to Langmuir equation the chemical capacities of the four elements were calculated.

The toxicities of each and their binary mixtures of 2 ,4-DNT and five derivatives of nitro benzenes to vibrio fischeri were determined respectively. Toxicity unit ( TU ) , additive index ( AI ) , similarity parameter (λ) and mixture toxicity index( MTI ) were used to evaluate the joint toxicity. The results show that the five binary mixtures showed all synergistic action. The abilities of synergistic action of the five mixtures were compared. The result by MTI was a little different from those by other three methods , but in general , when mixed with 2 ,4-DNT , p-chloronitrobenzene had the weakest synergistic action.

The NMR spectra are reported for troglitazone (5-[[4-[(6-hydroxy-2 ,5 ,7 ,8-tetramethyl-3 ,4-dihydrobenzopyran-2-yl-) methoxy ] pheny1 ] methy1] 2,4-thiazolidinedione) that is used as an oral hypoglycemic drug. By using DEPT , ¹H-¹H COSY , ¹³C-¹H HETCOSY and ¹³C-¹H LC-HETCOSY techniques along with IR , UV and MS , the proton and ¹³C spectra of troglitazone are assigned completely. This result also provides a basis analysis for the NMR characterization of the similar new drugs.

The changing pattern of Aneurolepidium chinense fuel moisture was studied in order to discover the changing pattern of Aneurolepidium chinense fuel flammability in Songnen Plain. In the process of withering , there is a trend for plant flammability to ascend , by the end of October the plant flammability reaches the maximum value in this period , in the latter period , there is an insignificant change in plant flammability. The post-rainfall flammability of Aneurolepidium chinense fuel goes down , but restores the pre-rainfall level after 7～8 h. In addition , the flammability is related with climatic factors.

We mensurated the lipase activity of Plancoccus Migula fermentation liquid , and studied the effects of all kinds of growth elements on the lipase yield. The result shows that the optimum conditions to yield lipase are that carbon source is glucose ; nitrogen source is peptone ; initial pH is 6.0 , and while K²HPO⁴, KH²PO⁴ ,CaCl² , ZnSO⁴ and NaCl can promote lipase production ; CuSO⁴ and MgSO⁴ can partly decrease lipase output ; FeCl³ , BaCl² , CoSO⁴ and MnSO⁴ inhibit lipase production completely. In addition non-ionic surface-active agents for instance Tween also promote lipase production.