Molecular Dynamics Simulation of Myoglobin Collision with Low Energy Ions

Collisions of a low energy heavy ion with a myoglobin in water are simulated by molecular dynamics model. The increase of total energy is very small. The mean squared fluctuation decreases at 300 K and increases at 250K. This is an important novel cooling effect that protects the protein from ion damage. The possible collision side effect is the change of tertiary structure that blocks the normal functions of the myoglobin.

Isospin Effects of Threshold Energy of Radial Flow in Heavy Ion Collisions

The threshold energies of radial flow in reactions of ^40 Ca-^40Ca and ^48Ca＋ ^48Ca in central collisions are investigated within an isospin dependent quantum molecular dynamics model by using three different forms of symmetry energy. It is found that the neutron-rich system has smaller threshold energy of radial flow and this quantity depends on the form of symmetry potential. It is indicated that the threshold energy of radial flow can provide a new method to determine the symmetry energy of asymmetric nuclear matter.

Suppression of Instability in Strongly Coupled Dusty Plasmas with Ion Flow

The instability of low-frequency longitudinal modes in strongly coupled dusty plasmas with an ion flow is investigated.The dust charging relaxation is taken into account.It is found that when the ion flow is strong enough,the suppression,even disappearence,of instability can occur.Similar to that of the real frequency of waves,the imaginary part of waves also exhibits a transition,which arises from the sensitive dependences on the system parameters and their competition.

Controlled Teleportation of an Arbitrary Multi-Qudit State in a General Form with d-Dimensional Greenberger-Horne-Zeilinger States

A general scheme for controlled teleportation of an arbitrary multi-qudit state with d-dimensional Greenberger- Horne--Zeilinger （GHZ） states is proposed. For an arbitrary m-qudit state, the sender Alice performs m generalized Bell-state projective measurements on her 2m qudits and the controllers need only take some single-particle measurements. The receiver Charlie can reconstruct the unknown m-qudit state by performing some single-qudit unitary operations on her particles if she cooperates with all the controllers. As the quantum channel is a sequence of maximally entangled GHZ states, the intrinsic efticiency for qudits in this scheme approaches 100% in principle.

A possible mechanism of current in medium under electromagnetic wave

In this paper a possible mechanism of current in medium is presented. Comparison between this current and the magnetization current was made. Expression for this current was derived. This work is helpful to understanding the interaction between medium and electromagnetic wave.

Probabilistic teleportation of an arbitrary GHZ-class state with a pure entangled two-particle quantum channel and its application in quantum state sharing

This paper presents a scheme for probabilistic teleportation of an arbitrary GHZ-class state with a pure entangled two-particle quantum channel. The sender Alice first teleports the coefficients of the unknown state to the receiver Bob, and then Bob reconstructs the state with an auxiliary particle and some unitary operations if the teleportation succeeds. This scheme has the advantage of transmitting much less particles for teleporting an arbitrary GHZ-class state than others. Moreover, it discusses the application of this scheme in quantum state sharing.

Photocatalytic and Photoelectronic Properties of Anatase TiO_2 Modified by Cu Ions Plasma and Its Theoretic Study by the First Principle Study

Highly oxidation. SEM analysis ordered anatase titania nanotube method was used to characterize arrays （TINT） were fabricated by anodic the morphology of the prepared samples. TiNT samples doped with Cu ions were prepared by home-made Metal Vapor Vacuum Arc ions sources （MEVVA, BNU, China） implanter. Photo-electric response and methyl orange decomposition ability of implanted samples under UV and visible light were tested, and the results indicated that the performance of Cu/TiNT enhanced significantly under visible light; it was noteworthy that the photocurrent density of A-Cu/TiNT was 0.102 mA/cm^2, which was 115 times that of pure TINT, and degradation ability of TiNT also strongly enhanced under visible light. In a word, the absorption spectrum of implanted anatase titania shifted to a longer wavelength region. Theoretic study on Cu-doped anatase based on density functional theory was carried out in this paper to validate the experiment results. The calculation results are depicted as follows： Intermittent energy band appeared around the Fermi energy after doping with Cu metal, the width of which was 0.35 eV and the location of valence and conduction bands shifted to the lower energy level by 0.22 eV; more excitation and jump routes were opened for the electrons. The narrowed band gaps allowed the photons with lower energy （at longer wavelength, such as visible light） to be absorbed, which accorded well with the experimental results.

Modified Dust-Acoustic Solitons by Adiabatic Variation of Dust Charges

By the multi-scale expansion method an effect of adiabatic variation of dust charges on dust-acoustic soliton is investigated.It is found that the amplitude of the soliton decreases while its width narrows in comparison with the case of constant dust charges.

Calculation of Electronic Structure of Anatase TiO_2 Doped with Transition Metal V,Cr,Fe and Cu Atoms by the Linearized Augmented Plane Wave Method

The electronic density of states and band structures of doped and un-doped anatase TiO2 were studied by the Linearized Augmented Plane Wave method based on the density functional theory. The calculation shows that the band structures of TiO2 crystals doped with transition metal atoms become narrower. Interesting, an excursion towards high energy level with increasing atomic number in the same element period could be observed after doping with transition metal atoms.

Coulomb Correction to Keldysh-Faisal-Reiss Theory for Photoionization of Atoms

In this paper,the Coulomb correction to Keldysh-Faisal-Reiss theory is derived in A-gauge.An application of the Coulomb correction to the photoelectric effect of H-atom is presented and the role of the gauge choice and the Coulomb correction are discussed.It is shown that the Coulomb correction plays an importaht role in the explanation of the recent energetic photoelectron spectra of He.

Transmission Efficiency of X-Rays Through a Cylinder Capillary

A new model for calculating the transmission efficiency of x-rays through a cylinder capillary is proposed.The model is based on some reasonable physical and mathematical assumptions.The calculation results given by the model have satisfactory intrinsic consistency and can get quite a good fit to the experimental results.

Microstructure and mechanical properties of TiN/AlN multilayers deposited by filtered vacuum arc deposition

Nanometer TiN/AlN multilayers were prepared on silicon substrate by filtered vacuum arc deposition.The structures of the nanometer TiN/AlN multilayer were studied by using X-ray diffraction. The 12 nm TiN/AlN multiplayer is composed of cubic TiN structure and hexagonal wurzite AlN structure, but the 2 nm period multilayer is composed of face centered cubic structure TiN and AlN with strong (200) texture. The surface roughness, hardness and elastic modulus of multilayer are dependent on the period of multilayer. The hardness of the TiN/AlN multilayers is higher than that suggested by a simple rule of mixture. The peaking hardness of nanometer TiN/AlN multilayers at period of 2 nm is about 42 GPa, much higher than that of 12 nm. The wear resistance of the nanometer TiN/AlN multilayers was also studied.

Study on Production of Exotic 0^＋ Meson D＇^＊aj（2317） in Decays of ψ（4415）

The newly observed D^＊aj family containing D^＊aj（2317）, Daj（2460）, and Daj（2632） attracts great interests. Determining their structures may be an important task for both theorists and experimentalists. In this work we use a non-relativistic model （the harmonic oscillator model） to evaluate the production rate of D^＊aj （2317） from the decays of ψ（4415）. For a comparison, we a/so employ the widely adopted heavy quark effective theory to repeat the calculation. We lind that the rate is sizable and may be observed at BES III and CLEO, if it is a p-wave excited state of Da（1968）. Unfortunately, the other two members of the family cannot be observed through decays of charmonia, because of the constraints from the final state phase space.

New Approaches and Solutions of Nonlinear Force-Free Magnetic Field

Some new approaches for nonlinear force-free magnetic field are presented and new exact solutions are found analytically. Examples are given and some implications of results to astrophysical solar plasmas as well as tokamak or/and spheromak plasmas are discussed.

Third-Harmonic Generated in EH32 Mode of a Gas-Filled WavegUide by fs Laser Pulses

In this paper it is reported for the first time that the third harmonic generated in EH32 mode of a gas-filled waveguide by fs pulses has higher generation efficiency. The new finding contrasts with the experiment in It. G. Durfee Ⅲ, S. Backus, M.M. Murnane, and H.C. Kapteyn, Opt. Left. 22 （1997） 1565]. Some possible factors, which produce the contradiction, are discussed briefly.

In situ Observation of Mo Implanted HI3 Steel by Transmission Electron Microscopy

In situ observation in high voltage transmission electron microscope(HVEM)was used to investigate the structure of Mo implanted HI3 steel.Instead of tempered Martensite structure,the implanted layer has a fine grain structure.When the implanted specimen is heated inside the HVEM,the fine grain structure does not change until 500℃.The electron diffraction pattern of precipitates FeMo appears at 500℃.Recrystallization and grain growth occur at 650℃.

Above Threshold Ionization Spectra of He in a Circularly Polarized Laser Field

A new analytic model for the above threshold ionization spectrum of He in a circularly polarized laser field is proposed.The experimental spectrum obtained by Mohideen et al.can be quite well described by this model.The spectra predicted by our model agree with experiment better than those of Reiss when the spatiotemporal profile of the laser pulse is taken into account and better than those of the Keldysh-Faisal-Reiss theory when the profile is not taken into account.At the same time,we find that the experimental value of the peak laser intensity was overstated by a factor of about 5.This result supports the previous similar claim by Reiss.

A NEW DERIVATION OF KELDYSHS FORMULA

In this letter,a new derivation of Keldysh's formula is presented and a brief discussion about the comparison between the new derivation and the original one is given.

Effects of H^(+)-Implantation on the Formation of Secondary Defects in Self-Implanted Si(100)

By using the plan-view transmission electron microscopy,cross-sectional transmission electron microscopy,and Rutherford backscattering(and channeling)spectrometry technology,the effects of H^(+)-implantation on the formation of secondary defects in self-implanted Si(100)were investigated.Experiments indicate that the H^(+)-implantation can reduce the formation of secondary defects and improve the perfection of crystal in self-implanted Si(100).

Deflection and Re-focusing of Relativistic Electrons in a Cylindrical Condenser

The relativistic equation of motion for electrons in a Cylindrical condenser is presented precisely.The analytical expression for the trajectory of electrons in the vicinity of the circular trajectory is given approximately,which has an error of about 1%in comparison with numerical calculations.The properties of the focuses are discussed with the theoretical results of this paper.