An improved type of elliptical jacket polarization maintaining fiber was developed by using a modified chemical vapor deposition method with special treatment. Different from conventional elliptical jacket, the shape ...An improved type of elliptical jacket polarization maintaining fiber was developed by using a modified chemical vapor deposition method with special treatment. Different from conventional elliptical jacket, the shape of the stress jacket was transmuted. The cross-section of fiber consists of 5 layers: substrate, outer cladding, stress jacket, inner cladding and core. The cross sectional component distribution was investigated by electron probe microscopy and energy dispersive spectrum. The finite element method was used to calculate the stress birefringence. Based on the analyses of the microstructure, the technological process is improved. The temperature cycling test of the fiber wound into gyroscope coils was performed. The results show that the fiber possesses superior performance at high and low temperatures compared with other fibers. The high homogeneity is achieved by well-controlled modified chemical vapor deposition process. A homogeneous length of 8 km fiber is obtained. With advantages in homogeneity and length, the fiber has great potential in applications such as fiber gyroscopes, fiber hydrophone and other optical fiber sensors.展开更多
1/4λ wave plate is a key element in the fiber-optic current sensor system. When a retardation error or an orientation error of birefringence axes of 1/4λ wave plate with respect to the hi-bi fiber axes occurs in the...1/4λ wave plate is a key element in the fiber-optic current sensor system. When a retardation error or an orientation error of birefringence axes of 1/4λ wave plate with respect to the hi-bi fiber axes occurs in the 1/4λ wave plate, the sensor system will output a wrong result of the measured current. The contributions of these two errors to the final result of the whole system were studied and the errors functions were deduced by establishing the measurement function of the current sensor system with Jones matrixes of the optical elements. The results show that that the greater the orientation error or the retardation error, the larger the final error, and that these two errors cannot be compensated each other.展开更多
Background:Cotton is the source of natural fibers globally,fulfilling 90%of the textile industry’s requirements.However,fiber development is a complex biological process comprising four stages.Fiber develops from a s...Background:Cotton is the source of natural fibers globally,fulfilling 90%of the textile industry’s requirements.However,fiber development is a complex biological process comprising four stages.Fiber develops from a single cell,and cell elongation is a vital process in fiber development.Therefore,it is pertinent to understand and exploit mechanisms underlying cell elongation during fiber development.A previous report about cell division control protein 42(CDC-42)with its key role in cell elongation in eukaryotes inspired us to explore its homologs Rho GTPases for understanding of cell elongation during cotton fiber development.Result:We classified 2066 Rho proteins from 8 Gossypium species into 5 and 8 groups within A and D sub-genomes,respectively.Asymmetric evolution of Rho members was observed among five tetraploids.Population fixation statistics between two short and long fiber genotypes identified highly diverged regions encompassing 34 Rho genes in G.hirustum,and 31 of them were retained through further validation by genome wide association analysis(GWAS).Moreover,a weighted gene co-expression network characterized genome-wide expression patteren of Rho genes based on previously published transcriptome data.Twenty Rho genes from five modules were identified as hub genes which were potentially related to fiber development.Interaction networks of 5 Rho genes based on transcriptional abundance and gene ontology(GO)enrichment emphasized the involvement of Rho in cell wall biosynthesis,fatty acid elongation,and other biological processes.Conclusion:Our study characterized the Rho proteins in cotton,provided insights into the cell elongation of cotton fiber and potential application in cotton fiber improvement.展开更多
基金Project(50272019) supported by the National Natural Science Foundation of China project supported by China Postdoc toral Science Foundation
文摘An improved type of elliptical jacket polarization maintaining fiber was developed by using a modified chemical vapor deposition method with special treatment. Different from conventional elliptical jacket, the shape of the stress jacket was transmuted. The cross-section of fiber consists of 5 layers: substrate, outer cladding, stress jacket, inner cladding and core. The cross sectional component distribution was investigated by electron probe microscopy and energy dispersive spectrum. The finite element method was used to calculate the stress birefringence. Based on the analyses of the microstructure, the technological process is improved. The temperature cycling test of the fiber wound into gyroscope coils was performed. The results show that the fiber possesses superior performance at high and low temperatures compared with other fibers. The high homogeneity is achieved by well-controlled modified chemical vapor deposition process. A homogeneous length of 8 km fiber is obtained. With advantages in homogeneity and length, the fiber has great potential in applications such as fiber gyroscopes, fiber hydrophone and other optical fiber sensors.
文摘1/4λ wave plate is a key element in the fiber-optic current sensor system. When a retardation error or an orientation error of birefringence axes of 1/4λ wave plate with respect to the hi-bi fiber axes occurs in the 1/4λ wave plate, the sensor system will output a wrong result of the measured current. The contributions of these two errors to the final result of the whole system were studied and the errors functions were deduced by establishing the measurement function of the current sensor system with Jones matrixes of the optical elements. The results show that that the greater the orientation error or the retardation error, the larger the final error, and that these two errors cannot be compensated each other.
基金supported by Funds of the National Key Research and Development Program(2016YFD0101006,2018YFD0100402)National Natural Science Foundation of China(31621005 and 31901581)Central Public-interest Scientific Institution Basal Research Fund(1610162021013).
文摘Background:Cotton is the source of natural fibers globally,fulfilling 90%of the textile industry’s requirements.However,fiber development is a complex biological process comprising four stages.Fiber develops from a single cell,and cell elongation is a vital process in fiber development.Therefore,it is pertinent to understand and exploit mechanisms underlying cell elongation during fiber development.A previous report about cell division control protein 42(CDC-42)with its key role in cell elongation in eukaryotes inspired us to explore its homologs Rho GTPases for understanding of cell elongation during cotton fiber development.Result:We classified 2066 Rho proteins from 8 Gossypium species into 5 and 8 groups within A and D sub-genomes,respectively.Asymmetric evolution of Rho members was observed among five tetraploids.Population fixation statistics between two short and long fiber genotypes identified highly diverged regions encompassing 34 Rho genes in G.hirustum,and 31 of them were retained through further validation by genome wide association analysis(GWAS).Moreover,a weighted gene co-expression network characterized genome-wide expression patteren of Rho genes based on previously published transcriptome data.Twenty Rho genes from five modules were identified as hub genes which were potentially related to fiber development.Interaction networks of 5 Rho genes based on transcriptional abundance and gene ontology(GO)enrichment emphasized the involvement of Rho in cell wall biosynthesis,fatty acid elongation,and other biological processes.Conclusion:Our study characterized the Rho proteins in cotton,provided insights into the cell elongation of cotton fiber and potential application in cotton fiber improvement.
