The robust phase locking of a linear diode array consisting of 49 broad-area emitters was demonstrated. The single lobe in the far field with output power of 0.83 W was observed. The far-field divergence was reduced t...The robust phase locking of a linear diode array consisting of 49 broad-area emitters was demonstrated. The single lobe in the far field with output power of 0.83 W was observed. The far-field divergence was reduced to 2.0 mrad. The spectral bandwidth was reduced from 1.7 to 0.13 nm.展开更多
The monomer agglomeration of nonmetallic inclusions was simulated with a diffusion limited aggregation （DLA） model of the fractal theory. The simulation study with a random two-dimensional diffusion was carried out....The monomer agglomeration of nonmetallic inclusions was simulated with a diffusion limited aggregation （DLA） model of the fractal theory. The simulation study with a random two-dimensional diffusion was carried out. The results indicate that the DLA model can be used for the simulation of agglomeration behavior of the cluster-type inclusions. The morphology of clusters was observed with SEM and compared with the simulated agglomerates. The modelling procedure of the DLA model is applicable for the agglomeration process. The uncertainty of agglomeration process and the persuasive average agglomerative ratio was analyzed. The factors about the agglomerative ratio with the collision path distance and the size of particles or seed were discussed. The adherence of the nonmetallic inclusions on the dam, the weir and the walls of a tundish, and the absorption of inclusions by stopper or nozzle were also discussed.展开更多
A planar fractal model for simulation of frost formation and growth was proposed based on diffusion limited aggregation(DLA)model and the computational simulation was carried out in this paper.By changing the times of...A planar fractal model for simulation of frost formation and growth was proposed based on diffusion limited aggregation(DLA)model and the computational simulation was carried out in this paper.By changing the times of program running circulation and the ratio of random particles generated,the simulation figures were gained under different conditions.A microscope is used to observe the shape and structure of frost layer and a digital camera with high resolution is used to record the pattern of frost layer at different time.Through comparing the simulation figures with the experimental images,we find that the simulation results agree well with the experimental images in shape and the fractal dimension of simulation figures is nearly equal to that of experimental images.The results indicate that it is reasonable to represent frost layer growth time with the program circulation times and to simulate the frost layer density variation during its growth process by reducing the random particle generation probability.The feasibility of using the suggested model to simulate the process of frost formation and growth was justified.The insufficiencies and its causes of this fractal model are also discussed.展开更多
The polymerase chain reaction based restriction fragment length polymorphism (FCR-RFLP)method was used to study DLA class Ⅱgene n dogs.Genomic DNA from 11 DLA homozygous reference dogs representing 8 different haplot...The polymerase chain reaction based restriction fragment length polymorphism (FCR-RFLP)method was used to study DLA class Ⅱgene n dogs.Genomic DNA from 11 DLA homozygous reference dogs representing 8 different haplotypes and 2 families with a total of 16 animals were amplified by the oligonuclectide primer pair (HLA-DRB-AMP-A/B) cross-hybriding HLA-DRB specific and fit for the amplification of DLA-DRE1 gene.The corresponding amplified DNA products were 235 base pairs[1].Amplified DNA was digested by 32 different restriction endonucleasts,whith could recognize allelic variations within DLA-DRB.After digesting only with Hae Ⅲ,HhaI,HitfI,RsaIand Sau96 high polymorphism was revealed respectively and 9 distinct RFLP pattern wert shown, which could be correate to the DLA haplotypes studied. The 8 cellular established DLA-D specificities presentin the reference panel were defined unequivocally by PCR-RFLP and correlated with DLADw5 and Dw6 two subtypes.The segregation pattern of four different DLA-DRE types could be demonstrated in two families.Based on these data we conclude that PCRRFLP typing utilizing the above mentioned priiner pair and endonuleases is a valuable tool to define DLA class Ⅱ types in the dog.展开更多
基金This work was supported by the National Natural Science Foundation of China (No. 10276003) the Nat ural Science Foundation of Beijing (No. 4051001).
文摘The robust phase locking of a linear diode array consisting of 49 broad-area emitters was demonstrated. The single lobe in the far field with output power of 0.83 W was observed. The far-field divergence was reduced to 2.0 mrad. The spectral bandwidth was reduced from 1.7 to 0.13 nm.
文摘The monomer agglomeration of nonmetallic inclusions was simulated with a diffusion limited aggregation （DLA） model of the fractal theory. The simulation study with a random two-dimensional diffusion was carried out. The results indicate that the DLA model can be used for the simulation of agglomeration behavior of the cluster-type inclusions. The morphology of clusters was observed with SEM and compared with the simulated agglomerates. The modelling procedure of the DLA model is applicable for the agglomeration process. The uncertainty of agglomeration process and the persuasive average agglomerative ratio was analyzed. The factors about the agglomerative ratio with the collision path distance and the size of particles or seed were discussed. The adherence of the nonmetallic inclusions on the dam, the weir and the walls of a tundish, and the absorption of inclusions by stopper or nozzle were also discussed.
基金supported by the National Nature Science Foundation of China(Grant No.50376001)the Beijing Natural Science Foundation(Grant No.3073014)the 6th Graduate Science and Technology Foundation Program of BJUT(Grant No.ykj-2007-1512)
文摘A planar fractal model for simulation of frost formation and growth was proposed based on diffusion limited aggregation(DLA)model and the computational simulation was carried out in this paper.By changing the times of program running circulation and the ratio of random particles generated,the simulation figures were gained under different conditions.A microscope is used to observe the shape and structure of frost layer and a digital camera with high resolution is used to record the pattern of frost layer at different time.Through comparing the simulation figures with the experimental images,we find that the simulation results agree well with the experimental images in shape and the fractal dimension of simulation figures is nearly equal to that of experimental images.The results indicate that it is reasonable to represent frost layer growth time with the program circulation times and to simulate the frost layer density variation during its growth process by reducing the random particle generation probability.The feasibility of using the suggested model to simulate the process of frost formation and growth was justified.The insufficiencies and its causes of this fractal model are also discussed.
文摘The polymerase chain reaction based restriction fragment length polymorphism (FCR-RFLP)method was used to study DLA class Ⅱgene n dogs.Genomic DNA from 11 DLA homozygous reference dogs representing 8 different haplotypes and 2 families with a total of 16 animals were amplified by the oligonuclectide primer pair (HLA-DRB-AMP-A/B) cross-hybriding HLA-DRB specific and fit for the amplification of DLA-DRE1 gene.The corresponding amplified DNA products were 235 base pairs[1].Amplified DNA was digested by 32 different restriction endonucleasts,whith could recognize allelic variations within DLA-DRB.After digesting only with Hae Ⅲ,HhaI,HitfI,RsaIand Sau96 high polymorphism was revealed respectively and 9 distinct RFLP pattern wert shown, which could be correate to the DLA haplotypes studied. The 8 cellular established DLA-D specificities presentin the reference panel were defined unequivocally by PCR-RFLP and correlated with DLADw5 and Dw6 two subtypes.The segregation pattern of four different DLA-DRE types could be demonstrated in two families.Based on these data we conclude that PCRRFLP typing utilizing the above mentioned priiner pair and endonuleases is a valuable tool to define DLA class Ⅱ types in the dog.
