Anisotropic Open Cosmological Models of Spin Matter with Magnetic Moment

We have derived a set of field equations for a Weyssenhoff spin fluid including magnetic interacton among the spinning particles prevailling in spatially homogeneous,but anisotropically cosmological models of Bianchi type V based on Einstein-Cartan theory.We analyze the field equations in three different equations of states specified by p=1(1/3)ρand p=0,The analytical solutions found are non-singular provided that the combined energy arising from matter spin and magnetic interaction among particles overcomes the anisotropy energy in the Universe,We have also deduced that the minimum particle numers for the radiation(p=(1/3)ρ) and matter(p=0) epochs are 10^88 and 10^108 respectively.the minimum particle number for the state p=ρ is 10^96,leading to the conclusion that we must consider the existence of neutrinos and other creation of particles and anti-particles under torsion and strong gravitational field in the early Universe.     

引力场中电磁波的传播和光线偏折

The gauge invariance of the electromagnetic field in gravitational field is an important question. We prove d' Alembert equation in gravitational field with gauge invariance under the Lorentz condition. Using the kinematic equation of photon in normal static and spherically symmetric gravitational fields, we deduce the orbital equation of photon. As a special example, we explicate the deduction and discussion about the deviation angular of light in Reissner-Nordstrom space-time.     

Deviation of light path in Born-lnfeld type gravitational field

The discovery of ＂twin quasi-stellar objects＂ arose interests among astronomers and astrophysicists to study gravitational leasing problem. Deviation of light from straight path is caused by the presence of massive objects, i.e., the presence of gravitational field according to the general theory of relativity. It is shown that the low energy effective field theory on D-branes is of the Born-Infeld type. In this work a Born-Infeld type gravitational field is pasttflated. An explicit representation of the angular deviation of light path is derived based on the space time metric in the Born-Infeld theory.     

Global asymptotic stability of positive equilibrium in a 3-species cooperating model with time delay

The asymptotic behavior of the time-dependent solution for a 3-species cooperating model was investigated with the effects of both diffusion and time delay taken into consideration. We proved the global asymptotic stability of a positive steady-state solution to the model problem by using coupled upper and lower solutions for a more general reaction-diffusion system that gives a common framework for 3-species cooperating model problems. The result of global asymptotic stability implies that the model system coexistence is permanent. Some global asymptotic stability results for 2-species cooperating reaction-diffusion systems are included in the discussion, and some known results are extended.     

The Lexical Approach and College English Teaching in China

Traditionally,language is considered to be a grammar vocabulary dichotomy system,and grammar and vocabulary seem to be independent of each other.This deep-rooted notion is particularly prevalent in Chinese English teaching and learning.Michael Lewis,the author of the Lexical Approach challenged the standard view of dividing language teaching into grammar and vocabulary.He believes that language is grammaticalised lexis,not lexicalized grammar,and lexis is the core of language learning while grammar is subordinate to it.This paper intends to explore its theoretical foundations and emphasize the great significance of the Lexical Approach to college English teaching in China.     

Where's the Young. Man Gone?

趣味完形填空 Mr Black has a company (公司) in New York andhis workers are building a 1 over a river near atown. He's strict with the workers and tells them to 2hard and get to the building site (工地) on time. Andseveral of them 3 because they were late. One summer afternoon it was very 4 outside.Mr Black came to the building site. He got off his 5and found all the workers working hard in the sun. He     

Theory and application of system integration for real-time monitoring of core rock-fill dam filling construction quality

The theory and method of system integration for the real-time monitoring of core rock-fill dam filling con- struction quality are studied in this paper. First, the importance analysis of system integration factors is carried out with the analytic hierarchy process. Then, according to the analysis result of integration factors, the conceptual model of system integration is built based on function integration, index integration, technology integration and information integration, the index structure of core rock-fill dam filling construction quality control is constructed and the method of function integration and technology integration is studied. The mathematical model of process monitoring is built according to monitoring objective, process and indexes. Research results have been applied in Nuozhadu core rock-fill dam construction management, realizing system integration through building appropriate monitoring work flow and comprehensive information platform of digital dam.     

克尔介质腔中耦合三能级原子与光场相互作用系统的动力学行为

The Hamiltonian of coupled three-level atoms interacting with light field in the cavity filled with Kerr-like medium is derived. A simplified analytic solution to the Schrodinger equation of the system is obtained. The case of A type atom with degenerate lower levels is discussed in detail. It is shown that the coupling strength between atoms and Kerr coefficient affect the system＇s dynamic behaviors, especially the modulation period and oscillation frequency of the squeezing parameters of the field and the collective dipole moment. Dynamic behaviors of the system are sensitive to the initial state of atoms.     

The Mona Lisa

Leonardo Da Vinci was a famous(著名)artist (艺术家)and (?) in Italy in the fifteenth and sixteenth centuries (世纪).He was a student in Florence, where he (?) paintings (绘画)and design(设计).He began a lot of paintings, (?) he didn't finish many of them. His (?) of the Mona Lisa is the (?) famous one in the world. Leonardo was (?) in many things. He wanted to know about (?) he saw. He thought the sun (?) around the earth. He wrote music. (?) designed a flying machine 400 years before the first one flew. Many people didn't understand his     

Attractor behavior in dilatonic （phantom） dark energy model with an especial potential

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.     

Aladdin And The Wonderful Lamp

Mansur was a magician.He lived in Africa. He read in one of his magic books about a wonderful lamp hidden in a hole in the ground in China.Aladdin and his mother lived in China.They were very poor:They lived in a hut and often had not enough food to eat.One day Aladdin's mother said,"Go out into the field and get some flowers;we will sell the flowers and get money to buy food."So Aladdin went into a field to get flowers.Now the place where the lamp was hidden was in a hole in that field.     

Mercury(1)

1.Mercury is the planet closest to the sun.It is thefastest moving planet.And it is the second smallestplanet in our solar system. 2.Mercury is very difficult to see.Its orbit isbetween us and the sun.So,we have to look toward thebright light of the sun to see it.The sunlight usuallyhides Mercury.When we can see it,it appears as a fuzzyball.     

周与唱歌的女孩

He was up before the sun, as usual. Standing out, in the field, he went through the slow chore-ographed movements of the tai chi regime that     

A Review of Studies on Interlanguage Pragmatics in China in the Last Decade

The present paper has reviewed the interlanguage pragmatics studies published in the core magazines of foreign study in China in order to outline the state of art at home.Meanwhile,the limitations of studies in the field are also discussed and suggestions for further research are proposed.     

Critical Review on Malcolm S.Knowles’s Work

Malcolm Shepherd Knowles(August 24,1913-November 27,1997) was an American Adult Educator,famous for the adoption of the theory of Andragogy.He is regarded as the first educator who contributes greatly to the foundation of adult education theoretical system in western world.He has contributed much to the development of the education field of the whole world.Thus,it becomes a vital issue to research Knowles’s works as an adult educater.     

Influence of Magnetic Field on the Rectification Process of Binary Heterogeneous Azeotrope

To improve separate effect of binary heterogeneous azeotrope in the magnetic field with different magnetic induction intensity, the influence of magnetic field on the rectification process of binary heterogeneous azeotrope was investigated with l-butanol-water system. The results show that the composition of liquid-liquid phase equilibrium of l-butanol-water system has definitely changed, the composition of l-butanol in light phase （l-butanol layer） increases by 1. 17%-1.63% and the composition of water in heavy phase （water layer） increases by 1.21%-1.58% under the influence of magnetic field. By separation of magnetization, the composition of l-butanol increases by 0.8%-1.2% and the recovery ratio of 1 -butanol increases by 1.6%-2.5%. Magnetic field has positive effect, however, the magnetized effect is not in proportion to magnetic induction intensity and has an optimum condition, in the range of 0.25 T-0. 3 T.     

Switchable 2,3-dithienylmaleimide bonded to different fluorophores:synthesis and photochromic properties

A series of photochromic diarylethene derivatives containing different fluorophores was synthesized by the Sonogashira coupling reaction and characterized by ^1H nuclear magnetic resonance （NMR）, ^13C NMR and mass spectroscopy. Photochromic conversion of Cz-MS was observed and its structural change was confirmed by proton NMR, Switchable absorption and emission phenomena were observed for these molecules. These phenomena were attributed to the reversible photochromic fluorescence resonance energy transfer （pcFRET） process. The design of this novel photochromic system of Py-4MS enables information to be processed in a non-destructive manner. This overcomes the problem of the destructive nature of tracking photochromism using ultraviolet （UV）-vis spectroscopy.     

The contribution of system and control theory to new technologies

Over the last five decades, modem directions in technological areas such as wireless networks and communications, complex robotic systems, satellites and space structures have been immensely benefited by the use of system and control＇s conceptual framework. Estimation, stability, controllability, robustness, optimality, adaptation, information and statistical engineering are only some of the fundamental ingredients of the so-called new and emerging technologies, which are within the collective preview of this paper. Furthermore, these two, contrarily to technological trends, well established fields of science have been continuously supported by formal modelling techniques, and advanced computational and simulation tools, which enable the analysis and design of new powerful and effective methodologies. Consequently, in this article the authors＇ aim follows two equal directions. At first, the authors would like to provide a profusion of many practical examples and real life problems arising in different application areas that may have in the past abstractly engaged the authors＇ attention and have offer a wealth of opportunities for creative system modelling and practical solutions development. That is the core of our paper. However, in order to be more explicit, and to further illustrate the authors＇ thoughts, the case of a tele-medicine-assisted home support system is used; a system of great interest in the emerging field of information technology and medical health care. Secondly, by developing the necessary conceptual framework and some more efficient methods, important and straightforwardly challenges are inevitably derived. Moreover, a strong effort to develop a formal approach requires the definition of a generic system framework. It is a central objective of this paper to clarify and unify the alternative notions of a ＂conceptual model＂ and thus, to create a basis for the systematic development of formal methods, control/information architectures and decision-making strategies. AMS （Classification）： 97U50, 97U70, 97U80, 97D99.     

A Brave Cock

Who welcomes the sun first in the morning? It’s the cock.He likes to show his golden clothes and a big,red cap in the sunshine. In September,all fruits and vegetables become red and golden.The cock begins to sing:     

Eccentricity and thermoviscous effects on ultrasonic scattering from a liquid-coated fluid cylinder

Calculation of the scattered field of the eccentric scatterers is an old problem with numerous applications. This study considers the interaction of a plane compressional sound wave with a liquid-encapsulated thermoviscous fluid cylinder submerged in an unbounded viscous thermally conducting medium. The translational addition theorem for cylindrical wave functions, the appropriate wave field expansions and the pertinent boundary conditions are employed to develop a closed-form solution in the form of infinite series. The analytical results are illustrated with a numerical example in which the compound cylinder is insonified by a plane sound wave at selected angles of incidence in a wide range of dimensionless frequencies. The backscattered far-field acoustic pressure amplitude and the spatial distribution of the total acoustic pressure in the vicinity of the cylinder are evaluated and discussed for representative values of the parameters characterizing the system. The effects of incident wave frequency, angle of incidence, fluid thermoviscosity, core eccentricity and size are thoroughly examined. Limiting case involving an ideal compressible liquid-coated cylinder is considered and fair agreement with a well-known solution is established.