A self-lubricated array film of amorphous carbon nanorods was prepared by chemical catalytic pyrolysis of acetylene on the anodic aluminum oxide membrane fabricated by two-step anodization of aluminum. The tribologica...A self-lubricated array film of amorphous carbon nanorods was prepared by chemical catalytic pyrolysis of acetylene on the anodic aluminum oxide membrane fabricated by two-step anodization of aluminum. The tribological properties of the array film of amorphous carbon nanorods in ambient air were investigated using a ball-on-disk tester at applied loads range from 245 mN to 1960 mN at a sliding velocity of 0.2 m/s. The self-lubricated array film exhibited a small value of the friction coefficient as well as good wear resistance. The friction coefficient of array film of amorphous carbon nanorods decreased gradually with increasing the applied load. The approach proposed demonstrated a new efficient route towards enhanced the friction and wear performances of aluminum.展开更多
A form invariance of Raitzin's canonical equations of relativistie mechanical system is studied. First, the Raitzin's canonical equations of the system are established. Next, the definition and criterion of th...A form invariance of Raitzin's canonical equations of relativistie mechanical system is studied. First, the Raitzin's canonical equations of the system are established. Next, the definition and criterion of the form invariance in the system under infinitesimal transformations of groups are given. Finally,the relation between the form invariance and the conserved quantity of the system is obtained and an example is given to illustrate the application of the result.展开更多
In this paper, the general Marcinkiewicz integral operator μ Ω,α on the H p Sobolev spaces under the proper condition of kernel Ω(x′) is considered. It is obtained that μ Ω,α is bounded from H p ...In this paper, the general Marcinkiewicz integral operator μ Ω,α on the H p Sobolev spaces under the proper condition of kernel Ω(x′) is considered. It is obtained that μ Ω,α is bounded from H p α to L p for some 0<p≤1.展开更多
RNA interference (RNAi) causes degradation of targeted endogenous RNA in many diverse organisms. To investigate the effect of dsRNA on silkworm cells, we trans- fected three kinds of synthetic dsRNAs of 435 bp(Ap1), 3...RNA interference (RNAi) causes degradation of targeted endogenous RNA in many diverse organisms. To investigate the effect of dsRNA on silkworm cells, we trans- fected three kinds of synthetic dsRNAs of 435 bp(Ap1), 300 bp(Ap2) and 399 bp(AH) in length against the various regions of BmNPV’s DNA polymerase gene and DNA helicase gene, which are indispensable for viral replication in silkworm cells by TransMessengerTM transfection Reagent. Results indicated that in the experiment where silkworm cells were infected with wild-strain BmNPV of the three dsRNAs, Ap2 and AH can effectively suppress the replication of virus, but Ap1 had no effect on the inhibition of viral replication. Ap2 and AH can reduce the infective titer of BmNPV with a peak change of approximately 3—4 logs on day 4 post-infection. The results of reverse transcript polymerase chain reaction (RT-PCR) and DNA dot blotting also indicated that the ex- pression level of the two target genes and the quantity of viral DNA both distinctly decreased under the influence of Ap2 or AH. Furthermore, using fluorescence microscopy we analyzed the distribution patterns of dsRNA. Our studies revealed that a majority of dsRNA was localized in the nu- clear periphery discontinuously after 24 h of transfection.展开更多
基金supported by the National Natural Science Foundation of China(No.50271067)Zhejiang Provincial Natural Science Foundation of China(No.ZC0203).
文摘A self-lubricated array film of amorphous carbon nanorods was prepared by chemical catalytic pyrolysis of acetylene on the anodic aluminum oxide membrane fabricated by two-step anodization of aluminum. The tribological properties of the array film of amorphous carbon nanorods in ambient air were investigated using a ball-on-disk tester at applied loads range from 245 mN to 1960 mN at a sliding velocity of 0.2 m/s. The self-lubricated array film exhibited a small value of the friction coefficient as well as good wear resistance. The friction coefficient of array film of amorphous carbon nanorods decreased gradually with increasing the applied load. The approach proposed demonstrated a new efficient route towards enhanced the friction and wear performances of aluminum.
文摘A form invariance of Raitzin's canonical equations of relativistie mechanical system is studied. First, the Raitzin's canonical equations of the system are established. Next, the definition and criterion of the form invariance in the system under infinitesimal transformations of groups are given. Finally,the relation between the form invariance and the conserved quantity of the system is obtained and an example is given to illustrate the application of the result.
基金Jiang and Jia were supported in part by Education Departmentof Zhejiang province
文摘In this paper, the general Marcinkiewicz integral operator μ Ω,α on the H p Sobolev spaces under the proper condition of kernel Ω(x′) is considered. It is obtained that μ Ω,α is bounded from H p α to L p for some 0<p≤1.
文摘RNA interference (RNAi) causes degradation of targeted endogenous RNA in many diverse organisms. To investigate the effect of dsRNA on silkworm cells, we trans- fected three kinds of synthetic dsRNAs of 435 bp(Ap1), 300 bp(Ap2) and 399 bp(AH) in length against the various regions of BmNPV’s DNA polymerase gene and DNA helicase gene, which are indispensable for viral replication in silkworm cells by TransMessengerTM transfection Reagent. Results indicated that in the experiment where silkworm cells were infected with wild-strain BmNPV of the three dsRNAs, Ap2 and AH can effectively suppress the replication of virus, but Ap1 had no effect on the inhibition of viral replication. Ap2 and AH can reduce the infective titer of BmNPV with a peak change of approximately 3—4 logs on day 4 post-infection. The results of reverse transcript polymerase chain reaction (RT-PCR) and DNA dot blotting also indicated that the ex- pression level of the two target genes and the quantity of viral DNA both distinctly decreased under the influence of Ap2 or AH. Furthermore, using fluorescence microscopy we analyzed the distribution patterns of dsRNA. Our studies revealed that a majority of dsRNA was localized in the nu- clear periphery discontinuously after 24 h of transfection.
