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Decay of Electric Charge on Corona Discharge Polyethylene

100%
Zhang L., Xu Z., Chen G.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1197-1200
EN
In this paper, surface potential decay after corona charge deposition has been investigated for low density polyethylene (LDPE) films. We believe that the three ways of electron charge decay on the surface of insulating polyethylene film is reasonable. The factor of neutralizing with opposite charge in air is negligible, and leakage along insulator surface or through the body is much more important for electron charge decay. Both ways are related with surface voltage of the sample. When the voltage is lower than a critical value, surface leakage contributes most. If the voltage is higher than this value, the electron energy on the surface of the sample exceeds the critical value and it is easy to cross the "deep trap". In this situation, the body leakage is more important, and the decay on the surface of sample speeds. That is why there exists decay curve crossing phenomenon.
2
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Intervalley Transfer of Electrons in ZnS-Type Thin Film Electroluminescent Devices

100%
Zhao H., Wang Y., Xu Z., Xu X.
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vol. 96
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issue 3-4
475-482
EN
Based on the calculation about intervalley scattering rates in ZnS, the intervalley transfer process in ZnS-type thin film electroluminescent devices is investigated through the Monte Carlo simulation. The transient time of intervalley transfer is about 0.2-0.3 ps, it coincides with that of electron average energy. Intervalley distribution shifts to high valleys as the electric field increased. The electron kinetic energy distributions in different valleys are also gained. We propose that high valleys could store energies, which could prolong the decay of the electron average energy as the field was removed. These results could be used as the basic data on the study of electroluminescent process and the citation of valley parameters in analytic models should be carefully considered.
3
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Effect of Mg and Ca on the Characteristics of Inclusions in Sulphur Steel

76%
Tian J., Qu T., Wang D., Wang H., Xu Z., Xinrui E.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 4
4

Cloning a DNA marker associated to wheat scab resistance

76%
Yu G., Ma H., Xu Z., Ren L., Zhou M., Lu W.
Journal of Applied Genetics
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2004
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vol. 45
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issue 1
17-25
EN
Wheat head blight caused mainly by Fusarium graminearum, is an important wheat disease, causing yield and quality losses. The breeding of resistant varieties is the key measure to control this disease, but the conventional breeding method is of low efficiency. The marker-assisted selection (MAS) can significantly improve the breeding efficiency. In this study, four RAPD (randomly amplified polymorphic DNA) markers linked to FHB resistance were obtained and one was cloned and sequenced. F7 recombinant inbred lines (RILs) were derived from the F1 of the cross Ning894037 (resistant)/Alondra (susceptible) by the single-seed descent method. Scab resistance of F7 RILs was evaluated in the greenhouse by injecting conidiospores into a central floret. Scab symptoms were evaluated on the 21st day after inoculation. Disease severity was assessed as the percentage of infected spikelets/spike. The F7 RIL population displayed a normal distribution, transgressive segregation and significant variation for FHB severity. DNA from resistant and susceptible parents was analyzed with 520 RAPD primers. Four markers (S1384-640,S1360-600, S1319-350,S1319-820) linked to FHB resistance were obtained. DNA of S1384-640 was recovered, subjected to re-amplification by using S1384 primer and the same protocol as for RAPD analysis and identified the rightness. The PCR product of S1384-640 was ligated into the pUCm-T vector, and cloned into fresh competent cells of Escherichia coli strain DH5 RAPD anlysis showed that the inserts of the recombinant plasmids were DNA of S1384-640. The sequencing result showed that the cloned fragment was 648 bp.
5
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Molecular cloning, expression, purification and osteoblasts proliferation activity of sika deer thymosin beta10

76%
Zhao D., Zhao Y., Zhang H., Xu Z., Liu M., Wang J., Bai X.
Polish Journal of Veterinary Sciences
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2017
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issue 4
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