The parallel algorithm of the evolutionary distance between different species is implemented by using OpenMP parallel technique in this paper.In order to get the best degree of algorithm parallelism,the method of maki...The parallel algorithm of the evolutionary distance between different species is implemented by using OpenMP parallel technique in this paper.In order to get the best degree of algorithm parallelism,the method of making loop variable corresponding to the rower and column labels of distance matrix is adopted.It is to say that the double loop can be converted into single loop to improve the parallel efficiency.The serial algorithm and parallel algorithm are compared in this paper.The experiment result shows that the highest speedup is 14.1.It improves the running efficiency of the program.It is a great significance to dealing with massive bioinformatics展开更多
In this paper, Ni-Co coatings were electrodeposited onto carbon steel substrates with the aid of ultrasonic agitation. The coatings were analyzed by energy dispersive X-ray analysis （EDX）, X-ray diffraction analysis...In this paper, Ni-Co coatings were electrodeposited onto carbon steel substrates with the aid of ultrasonic agitation. The coatings were analyzed by energy dispersive X-ray analysis （EDX）, X-ray diffraction analysis （XRD） and scanning electron microscopy （SEM）. The effects of the ultrasonic frequency on the roughness, hardness and corrosion resistance of the Ni-Co coatings were also investigated. The results indicated that the increase of the ultrasonic frequency from 20 to 120 kHz reduced the Ni content and the grain size of Ni-Co coatings. Moreover, the phase structure of the electrodeposited coatings was influenced by the ultrasonic frequency. Under 55 kHz ultrasonic agitation, the Ni-Co coating was single fcc phase and showed the finest roughness and the strongest corrosion resistance in 5 wt.% NaCl solution at the ambient temperature. Under ultrasonic agitation with frequency of 90 kHz, the coating was a mixture of fcc and hcp structure and showed the maximal hardness of about 420 HV. Therefore, ultrasonic agitation helped decrease the roughness, and enhance hardness and corrosion resistance of Ni-Co coatings.展开更多
文摘The parallel algorithm of the evolutionary distance between different species is implemented by using OpenMP parallel technique in this paper.In order to get the best degree of algorithm parallelism,the method of making loop variable corresponding to the rower and column labels of distance matrix is adopted.It is to say that the double loop can be converted into single loop to improve the parallel efficiency.The serial algorithm and parallel algorithm are compared in this paper.The experiment result shows that the highest speedup is 14.1.It improves the running efficiency of the program.It is a great significance to dealing with massive bioinformatics
基金financially supported by the National Nature Science Fund of China(No.51204115)
文摘In this paper, Ni-Co coatings were electrodeposited onto carbon steel substrates with the aid of ultrasonic agitation. The coatings were analyzed by energy dispersive X-ray analysis （EDX）, X-ray diffraction analysis （XRD） and scanning electron microscopy （SEM）. The effects of the ultrasonic frequency on the roughness, hardness and corrosion resistance of the Ni-Co coatings were also investigated. The results indicated that the increase of the ultrasonic frequency from 20 to 120 kHz reduced the Ni content and the grain size of Ni-Co coatings. Moreover, the phase structure of the electrodeposited coatings was influenced by the ultrasonic frequency. Under 55 kHz ultrasonic agitation, the Ni-Co coating was single fcc phase and showed the finest roughness and the strongest corrosion resistance in 5 wt.% NaCl solution at the ambient temperature. Under ultrasonic agitation with frequency of 90 kHz, the coating was a mixture of fcc and hcp structure and showed the maximal hardness of about 420 HV. Therefore, ultrasonic agitation helped decrease the roughness, and enhance hardness and corrosion resistance of Ni-Co coatings.
