Deng Zhiwei

Polymer modification by MEVVA source deposited and ion implantation

Polyethylene terephthalate (PET) has been modified by Ti, Ni and W deposition using a metal vapor vacuum arc (MEVVA) source and implantation. The surface resistance of deposited PET could decrease to several hundred ohms. The adhesion of metal coating on polymers is very strong. The thickness of the deposited metal coating could be controlled from tens of nanometers to 1 μm. The hardness for thick Ti and W deposited PET is 3.81 and 2.54 GPa, which are several times greater than that of PET. The elastic modulus of deposited PET increases also. Similar results have been observed for other metal implanted PET. The thickness and atomic distribution of deposited metal coating was analyzed using RBS. The surface structure has varied after deposition and implantation. It is believed that the change would cause the improvement of the conductive properties and wear resistance.

Implementation of a multiple round quantum dense coding using nuclear magnetic resonance

A multiple round quantum dense coding scheme based on the quantum phase estimation algorithm is proposed and implemented in a three qubit nuclear magnetic resonance (NMR) quantum computer. Using anm+1 qubit system, Bod can transmit one of 2m+1 messages to Alice, through manipulating only one qubit and exchanging it between Alice and Bob form rounds. The information capacity is enhanced tom+1 bits as compared tom bits in a classical scheme. The scheme has been demonstrated in NMR system, and the experimental results show a good agreement between theory and experiment.

The ternary Ti (Zr, N) phases formation and modification of TiN coatings by Zr+ MEVVA ion implantation

Abstract The TEM observation shows that TiN coating changed over from columnar structure to compact texture after Zr + implantation. X-Ray analysis indicates that combining of N with Zr, Ti atoms and Ti 2 N would be transformed into TiN and ternary Ti (Zr, N) phases during Zr-implantation with high doses, high ion flux and annealing. Therefore, the wear resistance had improved obviously, the hardness of the TiN coating increased by 1.3–1.7 times after Zr + implantation. The wear resistance of implanted TiN coatings increased obviously. As an attractive procedure, the MEVVA source ion implantation of the TiN coatings would find new applications in many fields.

Cycloartane triterpenes from marine green alga Cladophora fascicularis

Six cycloartanes were isolated from ethanol extract of marine green algaCladophora fascicularis by column chromatography. Procedure of isolation and description of these compounds are given in this paper. The structures were elucidated as (1). 24-hydroperoxycycloart-25- en-3β-ol; (2). cycloart-25-en-3β 24-diol; (3). 25-hydroperoxycycloart-23-en-3β-ol; (4). cycloart-23-en-3β, 25-diol; (5). cycloart-23, 25-dien-3β-ol; and (6). cycloart-24-en-3β-ol by spectroscopic (MS, ID and 2D NMR) data analysis. Cycloartane derivatives are widely distributed in terrestrial plants, but only few were obtained in the alga. All these compounds that have been isolated from terrestrial plants, were found in the marine alga for the first time.

NMR analogue of the generalized Grover's algorithm of multiple marked states and its application

The generalized Grovers algorithm for the case in which there are multiple marked states is demonstrated on a nuclear magnetic resonance (NMR) quantum computer. The Walsh-Hadamard transform and the phase inversion are all replaced. NMR analogues of Einstein-Podolsky-Rosen states (pseudo-EPR states) are synthesized using the above algorithm.

Modification of TiN Coatings by N+ and C+ Implantation with High Ion Flux

The TiN coating changed from columnar structure to compact texture after N+ and C+ implantation. X-ray analysis showed that combining with N atoms, Ti and Ti2N would be transformed into TiN Phases during N implantation. The ternary solid solution mixtures TiCN have been formed, while Ti, Ti2N would be transformed into TiC and TiCN phases combining with C atoms after C implantation. The hardness of the TiN coating increased by 2.3-2.4 times after N+ or C+ implantation. The wear resistance of implanted TiN coatings is 2-3 times higher than that of unimplanted TiN coatings. When the drills were treated with the method, their lifetime would increase by 7 times comparing with unimplanted ones. As an attractive procedure, the ion implantation of the TiN coatings would find new applications in many fields.

Properties of corrosion resistance in C++W+ dual implanted steel with nanometer phases

Abstract The property of corrosion resistance for C + +W + dual-implanted H13 steel was studied using multi-sweep cyclic voltammetry. The phase formation conditions for corrosion resistance and its effects were researched. The super-saturation solid station solution of W + and C + atoms was formed in tungsten plus carbon dual-implanted steel. Nanometer size precipitates consisting of the phases of Fe 2 W, FeW, WC, Fe 5 C 3 and Fe 7 C 3 were formed in the dual-implanted layer. The passivation layer consisted of the nanometer phases. The corrosion resistance of the dual implanted layer is better than that of single implantation. The corrosion resistance of the dual implantation was enhanced following increase of ion dose. When the W + ion dose was 6×10 17 /cm 2 in the dual implantation, J p of the dual implanted sample is 17–33 times less than that of J p in H13 steel.

Demonstration of Quantum Entanglement Control Using Nuclear Magnetic Resonance

With the two forms of the quantum entanglement control, the quantum entanglement swapping and preservation are demonstrated in a three-qubit nuclear magnetic resonance quantum computer. The pseudopure state is prepared to represent the quantum entangled states through macroscopic signals. Entanglement swapping is directly realized by a swap operation. By controlling the interactions between the system and its environment, we can preserve an initial entangled state for a longer time. The experimental results are in agreement with the experiment.

Realization of a Quantum Scheduling Algorithm Using Nuclear Magnetic Resonance

The quantum scheduling algorithm proposed by Grover is generalized to extend its scope of applications. The generalized algorithm proposed here is realized on a nuclear magnetic resonance quantum computer. The experimental results show that the generalized algorithm can work efficiently in the case that Grovers scheduling algorithm is completely invalid, and represent the quantum advantages when qubits replace classical bits.

Anomalous Diffusion of Mo Implanted into Aluminium

Mo ions are implanted into aluminium with a high ion flux and high dose at elevated temperatures of 300°C, 400°C and 500°C, respectively. X-ray diffraction spectra show that the Al12Mo phases are formed. Rutherford backscattering spectroscopy indicates that a profile of Mo appears in Al around the depth of 550 nm and with an atomic concentration of ~7%, when Mo is implanted to the dose of 3×1017/cm2 with an ion flux of 45 µA/cm2 (400°C). If the dose increases to 1×1018/cm2 at the same ion flux, the penetration of Mo ions in Al can reach a depth of 2000 nm, which is greater than the ion project range Rp (52.5 nm). The results show that anomalous diffusion takes place. Owing to the intense atom collision cascades, the diffusion coefficient increases greatly with the increase of the ion flux and dose. The Mo diffusion coefficients in Al are calculated. The Mo retained dose in Al increases obviously with the increase of the ion flux. PACS: 61. 10. -i, 61. 72. Ww, 66. 30. -h, 68. 55. Ln