关于T凸函数的不等式

In this paper, the Tφ-convex functions were introduced as a generalizations of convex functions. Then the characteristics of the Tφ-convex functions were discussed. Furthermore, some new inequalities for the Tφ-convex functions were derived.     

A Study of Code-switching in the College English Classroom

Code-switching is an important domain in the sociolingusitics. Since the 1970 s, lots of linguists and experts has attached great importance to it. This paper is a tentative study of code-switching in the teaching English as a second language(TESL) from such aspects: the review of code-switching, principles adhered to the code-switching, factors which leads to the code-switching, and attitudes and functions of code-switching in the TESL.     

The Pragmatic Analysis of English Euphemism

In daily communication, English euphemism is both a common linguistic and cultural phenomenon. In general, those disgusting, terrifying and unpleasant facts can be covered and those defacing, embarrassing things can be hidden by the use of euphemism. The originality of this paper lies in the study of English euphemism from the perspective of pragmatics. It discusses some fundamental knowledge and the pragmatic functions of English euphemism.     

The Analysis of Discourse Marker and its function in Listening Comprehension of CET-6

This paper focuses on the analysis of long conversations,which is the newly added question type after the CET innovation.By analyzing similarity and difference of markers and functions in short and long conversations,the characteristics of long conversations can be further illustrated.More attention should be paid to discourse markers when practicing long conversations so as to grasp the main idea of dialogue.And this paper also provides inspiration for CET teaching and learning.     

无约束全局最优化中的无参数填充函数

The filled function method is an approach for finding a global minimum of multi-dimensional functions.With more and more relevant research,it becomes a promising way used in unconstrained global optimization.Some filled functions with one or two parameters have already been suggested.However,there is no certain criterion to choose a parameter appropriately.In this paper,a parameter-free filled function was proposed.The definition of the original filled function and assumptions of the objective function given by Ge were improved according to the presented parameter-free filled function.The algorithm and numerical results of test functions were reported.Conclusions were drawn in the end.     

Global exponential stability of cellular neural networks with time delays

By using the properties of nonnegative matrices and techniques of differential inequalities, some sufficient conditions for the global exponential stability of cellular neural networks with time delays were obtained. The criteria do not require such conditions as boundedness and differentiability of activation functions. The conditions of the theorem were verified.     

A Family of Exact Solutions fort the Nonlinear Schrodinger Equation

In this paper,the nonlinear Schrodinger(NLS)equation was analytically solved.Firstly,the stationary solutions of NLS equation were explicitly given by the elliptic functions.Then a family of exact solutions of NLS equation were botained from these stationary solutions by a method for finding new exact solutions from the stationary solutions of integrable evolution equations.     

Optimal velocity functions for car-following models

The integral part of the optimal velocity car-following models is the optimal velocity function （OVF）, which can be derived from measured velocity-spacing data. This paper discusses several characteristics of the OVF and presents regression analysis on two classical datasets, the Lincoln and Holland tunnels, with different possible OVFs. The numerical simulation of the formation of traffic congestion is conducted with three different heuristic OVFs, demonstrating that these functions give results similar to those of the famous Bando OVF （Bando et al., 1995）. Also an alternative method is present for determining the sensitivity and model parameters based on a single car driving to a fixed barrier.     

Karl Gustav Jacob Jaeobi

Dec 10 1804 - Feb 18 1851Born Potsdam, Germany. Died Berlin, Germany.Jacobi founded the theory of elliptic functions. Jacobi's father was a banker and his family were prosperous so he received a good education at the University of Berlin. He obtained his Ph.D. in 1825 and taught mathematics at the University of K?nigsberg from 1826 until his death, being appointed to a chair in 1832. He founded the theory of elliptic functions based on four theta functions. His "Fundamenta nova theoria f…     

Smoothing newton algorithm for solving generalized complementarity problem

The generalized complementarity problem includes the well-known nonlinear complementarity problem and linear complementarity problem as special cases.In this paper, based on a class of smoothing functions, a smoothing Newton-type algorithm is proposed for solving the generalized complementarity problem.Under suitable assumptions, the proposed algorithm is well-defined and global convergent.     

Predicting the shrinkage of thermal insulation mortar by probabilistic neural networks

This study explored the potential of using probabilistic neural networks （PNN） to predict shrinkage of thermal insulation mortar.Probabilistic results were obtained from the PNN model with the aid of Parzen non-parametric estimator of the probability density functions （PDF）.Five variables,water-cementitious materials ratio,content of cement,fly ash,aggregate and plasticizer,were employed for input variables,while a category of 56-d shrinkage of mortar was used for the output variable.A total of 192 groups of experimental data from 64 mixtures designed using JMP7.0 software were collected,of which 120 groups of data were used for training the model and the other 72 groups of data for testing.The simulation results showed that the PNN model with an optimal smoothing parameter determined by the curves of the mean square error （MSE） and the number of unrecognized probability densities （UPDs） exhibited a promising capability of predicting shrinkage of mortar.     

An Analysis of Physical Fitness Differences in Soccer,Handball,and Basketball

This study focuses on the evaluation of the differences of physical fitness among soccer players, handball players, and basketball players, and the investigation of the physical fitness structures of those players. The participants consisted of 160 elite players selected from university teams. Fourteen tests related to health and motor fitness were conducted. The results were subjected to a multivariate analysis of variance (MANOVA) to test the mean vector differences among the three groups of different sport. Nine out of the fourteen tests were of significantly discriminating results regarding to different group, which include side step, abdominal strength, shuttle running, 100m running, pull-up, 1,500m running, trunk flexion, grip strength and broad jump, as determined by a stepwise regression approach. MANOVA showed that there was a significant difference (p< 0.001) of the mean vectors of the 9 tests among the three events. Discriminant function analysis showed that three discriminant functions were s     

Relationship of glass forming ability and local structural properties of liquid Cu-Zr alloys

Molecular dynamics (MD) simulations were performed to investigate the glass forming ability (GFA) and microscopic structural properties of liquid Cu-Zr alloys. Based on the analysis of composition dependences of the reduced glass transition temperatures and the excess volume, we found that the Cu-Zr glasses have the largest GFA at Cu65Zr35 composition. To get more detailed information of local structure, we calculated the pair correlation functions, partial pair correlation functions, the excess entropy, chemical order parameter, coordination number, and Voronoi index of Cu-Zr liquids. We found that there exists an obvious and close relationship among the GFA, the excess entropy calculated using the total pair correlation functions, chemical order parameters, and some Cu centered cluster with Voronoi index <0,2,8,1> and Zr centered cluster with Voronoi index <0,3,6,4>, which all have nonlinear dependences on Cu/Zr concentration and have extreme values at liquid Cu65Zr35 composition.     

The Indirect Effect of the Internal Forces on the Linear Angular Momentum of A System of Particles

It is demonstrated that if the vector sum of the external forces and the total external torque are functions of all the positions and the velocities of the particles, the internal forces will affect indirectly the linear momentum and the angular momentum of a system of the particles through the and. In order to ensure that the internal forces have no effect on the and of the system, the external forces must be restricted to a linear function of and. Some examples which show that internal forces do affect the motion of the center of mass and the angular momentum of the system were discussed.     

A genre-based analysis of English research article abstracts and the linguistic feature of personal pronouns for financial economics

This paper presents an empirical study of move structures and personal pronouns of fifty English RA （research article） abstracts based on the model of Bhatia （1990）. It revealed that three other move patterns were ascertained besides ten out of the analyzed abstracts following his move order. The analysis of personal pronouns showed that first-person plural pronouns are used far more frequently than other types of personal pronouns and no presence of the second-person and the third-person pronouns were detected in the abstracts. A further analysis suggests that first-person plural pronouns can perform multiple functions in abstracts. ESP （English as Special Purpose） teachers may benefit from the study to guide students to explore the discourse conventions of the RA abstracts in their own texts.     

Solution of the Dirac equation with the ring-shaped oscillator potential

The ring-shaped oscillator potential, obtained by replacing the Coulomb part of the Hartmann potential by a harmonic oscillator term, was investigated. Under the equal vector potential and scalar potential, the Dirac equation was solved in spherical coordinate. The exact energy spectrum of the bound states was presented as a solution to the confluent hypergeometric equation by boundary conditions. Furthermore, the normalized angular and radial wave functions were presented.     

Generating functions for powers of second-order recurrence sequences

For the sequences satisfying the recurrence relation of the second order,the generating functions for the products of the powers of these sequences are established.This study was from Carlita and Riordan who began a study on closed form of generating functions for powers of second-order recurrence sequences.This investigation was completed by Stnica.Inspired by the recent work of Istva'n about the non-closed generating functions of the products of the powers of the second-order sequences,the authors give s...     

Metal Chlorides Supported Solid Catalysts for F-C Acylations of Arenes

A series of metal chlorides supported solid catalysts were prepared by simple wet impregnation method. Their catalytic performances for Friedel-Crafts acylation of toluene with benzoyl chloride were evaluated and the excellent results were obtained over Fe Cl3/Si O2. These catalysts were characterized by BET, NH3-TPD and FT-IR of pyridine adsorption to clarify the structure-activity relationship. It was found that Fe Cl3/Si O2 has larger pore size and pore volume than other catalysts, which increased the accessibility of the catalyst. In addition, Fe Cl3/Si O2 exhibited higher molar ratio of Lewis acid sites and Brφnsted acid sites, which might be another reason for the increase of toluene conversion. Furthermore, the reaction parameters, including temperature, time and molar ratio, were optimized. Under the optimized conditions, 91.2%, conversion and 82.0%, selectivity were obtained. Meanwhile, the generality of the catalyst was demonstrated by the acylations of alkyl substituted aromatics. Finally, the catalyst was reused for four runs with slight loss in catalytic activity, which attributed to the drain of the active component.     

Axisymmetrical Nonlinear Bending and Buckling of a Circular Plate Under Large Load

With the terms of the exact series solution taken as trial functions, the method of point collocation was used to calculate the large deflection of a circular plate. The axisymmetrical bending formulae were developed for the calculation of a circular plate subjected to polynomial distributed loads, a concentrated load at the center, uniform radial forces and moments along the edge or their combinations. The support may be elastic. The buckling load was calculated. Under action of uniformly distributed load, central load or their compound load, solutions were compared with those obtained by other methods, Buckling beyond critical thrust was compared with that calculated by the power series method. The method presented in this paper has advantages of wide convergent range, high precision and short computing time. Moreover, the computing time is nearly independent of the complexity of the loads.     

A new digital approach to design multivariable robust optimal control systems

This paper presents a new design of robust optimal controller for multivariable system. The row characteristic functions of a linear multivariable system and dynamic decoupling of its equivalent system, were applied to change the transfer function matrix of a closed-loop system into a normal function matrix, so that robust H∞optimal stability is guaranteed. Furthermore, for the decoupled equivalent control system the l∞optimization approach is used to have the closed-loop system embody optimal time domain indexes. A successful application on a heater control system verified the excellence of the new control scheme.