Seventh International Conference on Document Analysis and Recognition, 2003. Proceedings., 2003
In this paper we introduce a practical flight coupon automatic processing system for scanning and... more In this paper we introduce a practical flight coupon automatic processing system for scanning and recognition. We discuss the coupon classification, character location and binarization. We emphasize a high performance character segmentation and recognition engine, which are proved very effective. The results of experiment and commercial running applying the system are presented.
The Sr2SiO4 : Dy3+ phosphor was synthesized by the high temperature solid-state reaction method i... more The Sr2SiO4 : Dy3+ phosphor was synthesized by the high temperature solid-state reaction method in air. Dy2O3 (99.9%), SiO2 (99.9%), SrCO3 (99.9%), Li2CO3 (99.9%), Na2CO3 (99.9%) and K2CO3 (99.9%) were used as starting materials, and the Dy3+ doping concentration was 2 mol%. The emission spectrum was measured by a SPEX1404 spectrophotometer, and all the characterization of the phosphors was conducted at room temperature. The emission spectrum of Sr2 SiO4 : Dy3+ phosphor showed several bands centered at 486, 575 and 665 nm under the 365 nm excitation. The effect of Li+, Na+ and K+ on the emission spectra of Sr2SiO4 : Dy3+ phosphor was studied. The results show that the location of the emission spectrum of Sr2SiO4 : Dy3+ phosphor was not influenced by Li+, Na+ and K+. However, the emission spectrum intensity was greatly influenced by Li+, Na+ and K+, and the evolvement trend was monotone with different charge compensation, i. e. the emission spectrum intensity of Sr2SiO4 : Dy3+ phosphor firstly increased with increasing Li+ concentration, then decreased. However the charge compensation concentration corresponding to the maximum emission intensity was different with different charge compensation, and the concentration is 4, 3 and 3 mol% corresponding to Li+, Na+ and K+, respectively. And the theoretical reason for the above results was analyzed.
Deletion of sti on Streptomyces plasmid pIJ101, made its derivative pHZ1358 an efficient vector f... more Deletion of sti on Streptomyces plasmid pIJ101, made its derivative pHZ1358 an efficient vector for gene disruption and replacement. Here, we further optimized pHZ1358 by the construction of a derivative plasmid pJTU1278, in which a cassette carrying multiple cloning sites and a lacZ selection marker was introduced for convenient plasmid construction in E. coli. Furthermore, we also deleted oriT region of the pJTU1278, generated a vector (pJTU1289) that can be used specifically for PCR-targeting. The efficient usage of these vectors was demonstrated by the deletion of a gene involved in avermectin biosynthetic in S. avermitilis.
DNA phosphorothioate modification (DNA sulfur modification, a non-bridging oxygen swapped with a ... more DNA phosphorothioate modification (DNA sulfur modification, a non-bridging oxygen swapped with a sulfur) exists in diverse bacteria. Salmonella enterica serovar Cerro 87 is one of the bacteria that harbor the DNA sulfur modification. The modification is carried out by the products of a four-membered gene cluster, dptBCDE. Transformation of Escherichia coli DH10B with the dptBCDE gene cluster endows the strain with DNA sulfur modification capability. Deletion of dptC abolished the modification. Here, we studied the function of dptC in DNA sulfur modification. Six cysteine residues in dptC were mutated individually within the dptBCDE gene cluster. Mutants were then tested for DNA sulfur modification. Among the 6 cysteine mutations (C39, C146, C262, C273, C280, and C283), 5 abolished DNA modification except for C39, suggesting that C146, C262, C273, C280, and C283 are essential for DNA sulfur modification. Sequence alignment shows that these five cysteine residues are conserved among different strains. Mutation at anyone of C146, C262, C273, C280 and C283 of dptC abolished DNA modification. Our results shed light on further study of DNA sulfur modification biochemical pathway.
A QoS-driven multicast tree generation algorithm is discussed by considering QoS (Quality of Serv... more A QoS-driven multicast tree generation algorithm is discussed by considering QoS (Quality of Service) requirements and network resource constraints in multimedia group communication. Inspired by the successful application of optimization computing methods-GA (Genetic Algorithm) in other combinatorial optimization problems, an algorithm is proposed, which constructs a QoS-driven multicast routing tree based on genetic algorithm. By simulation research, some application parameters of the algorithm are given; meanwhile, the feasibility, effectiveness and robustness of the algorithm are also proved.
Optik - International Journal for Light and Electron Optics
A yellow emitting phosphor Sr2ZnMoO6:Dy3+ is synthesized by a solid state reaction at 1250 °C for... more A yellow emitting phosphor Sr2ZnMoO6:Dy3+ is synthesized by a solid state reaction at 1250 °C for 4 h, and its luminescent properties are investigated. Its phase formation is carried out with X-ray powder diffraction analysis, and there has no crystalline phases other than Sr2ZnMoO6. Sr2ZnMoO6:Dy3+ can produce yellow emission under the 272 and 387 nm radiation excitation, and the prominent luminescence in yellow (575 nm) due to the 4F9/2–6H13/2 transition of Dy3+. For the 575 nm emission, the excitation spectrum present one broad band and some narrow bands, and the peaks locate at 272, 324, 350, 365, 387, 426 and 474 nm, respectively. Its emission intensity is influenced by the Dy3+ doping concentration, and the concentration quenching effect is also observed. The CIE chromaticity coordinates values of Sr2ZnMoO6:Dy3+ show the almost same results with the different Dy3+ concentration, and locate in the yellow region.
IOP Conference Series Materials Science and Engineering
Steady-state dendrite growth is controlled by the states of dendrite tips, thus the morphology an... more Steady-state dendrite growth is controlled by the states of dendrite tips, thus the morphology and growth kinetics of dendrite tip have always been a highly-studied issue in the field of dendrite growth. A crucial problem is to find out the factors influencing the morphology of dendrite tip, and to clarify their working mechanism. Since dendrite tip is at micrometer or even atomic scale, interface energy may probably plays an important role during the formation and stabilization of dendrite tips. Investigations of this issue at atomic scale is of significant because it can help us to clearly observe the morphology evolution of dendrite tip fundamentally, and specifically reveal the relationship between interface energy anisotropy and dendrite tip morphology. We investigate growth kinetics and morphology of dendrite tips at atomic scale by using phase-field crystal simulation. Atomic scale steady-state dendrite tips are obtained at different interface energy anisotropy and growth dri...
A novel orange–red emitting phosphor Sr3La(PO4)3:Ce3+, Mn2+ is synthesized by a high temperature ... more A novel orange–red emitting phosphor Sr3La(PO4)3:Ce3+, Mn2+ is synthesized by a high temperature solid state reaction, and its luminescent properties are investigated. The orange–red emission peaked at 605 nm of Mn2+ is greatly enhanced by the sensitizer Ce3+ due to efficient energy transfer from Ce3+ to Mn2+. The energy transfer is demonstrated to belong to a resonant type via a dipole–quadrupole mechanism. The critical distance for Ce3+–Mn2+ energy transfer is calculated to be 1.32 nm by concentration quenching method. The preliminary results indicate that Ce3+ ion may be a optimal sensitizer for the orange–red phosphor Sr3La(PO4)3:Mn2+.
Dalton transactions (Cambridge, England : 2003), Jan 8, 2015
A series of single-composition phosphors LiBaB9O15:Tb(3+),Eu(3+) have been prepared via a high-te... more A series of single-composition phosphors LiBaB9O15:Tb(3+),Eu(3+) have been prepared via a high-temperature solid-state reaction process. The structure and luminescence properties of phosphors are described. The LiBaB9O15:Tb(3+) phosphor shows a characteristic green emission, with the peak located at 551 nm, which corresponds to the (5)D4 → (7)F5 transition of Tb(3+). The LiBaB9O15:Eu(3+) phosphor presents an obvious red emission, with the peak located at 617 nm, which is ascribed to the (5)D0 → (7)F2 transition of Eu(3+). The highly intense red emission peaks of the Eu(3+) ions were attributed to an effective energy transfer from the Tb(3+) to Eu(3+) ions in LiBaB9O15:Tb(3+),Eu(3+), which has been verified through the luminescence spectra and the fluorescence decay dynamics. The results mean that LiBaB9O15:Tb(3+),Eu(3+) phosphors might have potential applications as a red emitting phosphor for white LEDs.
Ethernet has gained popularity for deploying in Metropolitan Area Networks (MANs) due to its ease... more Ethernet has gained popularity for deploying in Metropolitan Area Networks (MANs) due to its ease of management and highly cost effective. While the flat addressing scheme (i.e., non-hierarchical MAC addresses) and the broadcast based address resolution scheme simplify many aspects of configuration, they also bring poor scalability. This paper aims at developing an efficient and scalable Metro-Ethernet architecture. To achieve this goal, we propose a Distributed Registration based Address Resolution Protocol (DRARP) and an End user enabled Mac-in-Mac (EMiM) encapsulation scheme. DRARP solves an unknown address through unicast, and hence eliminates the broadcast messages. EMiM does Mac-in-Mac (MiM) encapsulation by end users instead of the Provider Edge (PE) nodes, thus significantly reducing the PE node's forwarding table size. The proposed architecture sustains the Ethernet's plug-and-play feature and provides high scalability. The simulation results show that the proposed ...
Metro Ethernet has recently attracted remarkable attention due to its simplicity and low cost. Al... more Metro Ethernet has recently attracted remarkable attention due to its simplicity and low cost. Although Ethernet is the dominant technology in the Local Area Network (LAN) which usually handles small number of nodes, when deploying in Metropolitan Area Networks (MANs), it faces certain challenges. One major challenge is its broadcasting based address resolution scheme. A broadcast-based address resolution scheme triggers many broadcast messages in a network, and hence make the Ethernet unscalable. This paper proposes a cache scheme, called Caching on Forwarding Table (CFT), to reduce broadcast messages for Metro Ethernet. CFT caches end user's Address Resolution Protocol (ARP) entries by inserting an IP address in each forwarding entry. If an ARP request is answered by a cached entry, the broadcast is stopped. Hence CFT can significantly reduce the broadcast messages in the network. We also discuss how to cache ARP entries in a Metro Ethernet using End User Enabled MAC-in-MAC (M...
Seventh International Conference on Document Analysis and Recognition, 2003. Proceedings., 2003
In this paper we introduce a practical flight coupon automatic processing system for scanning and... more In this paper we introduce a practical flight coupon automatic processing system for scanning and recognition. We discuss the coupon classification, character location and binarization. We emphasize a high performance character segmentation and recognition engine, which are proved very effective. The results of experiment and commercial running applying the system are presented.
The Sr2SiO4 : Dy3+ phosphor was synthesized by the high temperature solid-state reaction method i... more The Sr2SiO4 : Dy3+ phosphor was synthesized by the high temperature solid-state reaction method in air. Dy2O3 (99.9%), SiO2 (99.9%), SrCO3 (99.9%), Li2CO3 (99.9%), Na2CO3 (99.9%) and K2CO3 (99.9%) were used as starting materials, and the Dy3+ doping concentration was 2 mol%. The emission spectrum was measured by a SPEX1404 spectrophotometer, and all the characterization of the phosphors was conducted at room temperature. The emission spectrum of Sr2 SiO4 : Dy3+ phosphor showed several bands centered at 486, 575 and 665 nm under the 365 nm excitation. The effect of Li+, Na+ and K+ on the emission spectra of Sr2SiO4 : Dy3+ phosphor was studied. The results show that the location of the emission spectrum of Sr2SiO4 : Dy3+ phosphor was not influenced by Li+, Na+ and K+. However, the emission spectrum intensity was greatly influenced by Li+, Na+ and K+, and the evolvement trend was monotone with different charge compensation, i. e. the emission spectrum intensity of Sr2SiO4 : Dy3+ phosphor firstly increased with increasing Li+ concentration, then decreased. However the charge compensation concentration corresponding to the maximum emission intensity was different with different charge compensation, and the concentration is 4, 3 and 3 mol% corresponding to Li+, Na+ and K+, respectively. And the theoretical reason for the above results was analyzed.
Deletion of sti on Streptomyces plasmid pIJ101, made its derivative pHZ1358 an efficient vector f... more Deletion of sti on Streptomyces plasmid pIJ101, made its derivative pHZ1358 an efficient vector for gene disruption and replacement. Here, we further optimized pHZ1358 by the construction of a derivative plasmid pJTU1278, in which a cassette carrying multiple cloning sites and a lacZ selection marker was introduced for convenient plasmid construction in E. coli. Furthermore, we also deleted oriT region of the pJTU1278, generated a vector (pJTU1289) that can be used specifically for PCR-targeting. The efficient usage of these vectors was demonstrated by the deletion of a gene involved in avermectin biosynthetic in S. avermitilis.
DNA phosphorothioate modification (DNA sulfur modification, a non-bridging oxygen swapped with a ... more DNA phosphorothioate modification (DNA sulfur modification, a non-bridging oxygen swapped with a sulfur) exists in diverse bacteria. Salmonella enterica serovar Cerro 87 is one of the bacteria that harbor the DNA sulfur modification. The modification is carried out by the products of a four-membered gene cluster, dptBCDE. Transformation of Escherichia coli DH10B with the dptBCDE gene cluster endows the strain with DNA sulfur modification capability. Deletion of dptC abolished the modification. Here, we studied the function of dptC in DNA sulfur modification. Six cysteine residues in dptC were mutated individually within the dptBCDE gene cluster. Mutants were then tested for DNA sulfur modification. Among the 6 cysteine mutations (C39, C146, C262, C273, C280, and C283), 5 abolished DNA modification except for C39, suggesting that C146, C262, C273, C280, and C283 are essential for DNA sulfur modification. Sequence alignment shows that these five cysteine residues are conserved among different strains. Mutation at anyone of C146, C262, C273, C280 and C283 of dptC abolished DNA modification. Our results shed light on further study of DNA sulfur modification biochemical pathway.
A QoS-driven multicast tree generation algorithm is discussed by considering QoS (Quality of Serv... more A QoS-driven multicast tree generation algorithm is discussed by considering QoS (Quality of Service) requirements and network resource constraints in multimedia group communication. Inspired by the successful application of optimization computing methods-GA (Genetic Algorithm) in other combinatorial optimization problems, an algorithm is proposed, which constructs a QoS-driven multicast routing tree based on genetic algorithm. By simulation research, some application parameters of the algorithm are given; meanwhile, the feasibility, effectiveness and robustness of the algorithm are also proved.
Optik - International Journal for Light and Electron Optics
A yellow emitting phosphor Sr2ZnMoO6:Dy3+ is synthesized by a solid state reaction at 1250 °C for... more A yellow emitting phosphor Sr2ZnMoO6:Dy3+ is synthesized by a solid state reaction at 1250 °C for 4 h, and its luminescent properties are investigated. Its phase formation is carried out with X-ray powder diffraction analysis, and there has no crystalline phases other than Sr2ZnMoO6. Sr2ZnMoO6:Dy3+ can produce yellow emission under the 272 and 387 nm radiation excitation, and the prominent luminescence in yellow (575 nm) due to the 4F9/2–6H13/2 transition of Dy3+. For the 575 nm emission, the excitation spectrum present one broad band and some narrow bands, and the peaks locate at 272, 324, 350, 365, 387, 426 and 474 nm, respectively. Its emission intensity is influenced by the Dy3+ doping concentration, and the concentration quenching effect is also observed. The CIE chromaticity coordinates values of Sr2ZnMoO6:Dy3+ show the almost same results with the different Dy3+ concentration, and locate in the yellow region.
IOP Conference Series Materials Science and Engineering
Steady-state dendrite growth is controlled by the states of dendrite tips, thus the morphology an... more Steady-state dendrite growth is controlled by the states of dendrite tips, thus the morphology and growth kinetics of dendrite tip have always been a highly-studied issue in the field of dendrite growth. A crucial problem is to find out the factors influencing the morphology of dendrite tip, and to clarify their working mechanism. Since dendrite tip is at micrometer or even atomic scale, interface energy may probably plays an important role during the formation and stabilization of dendrite tips. Investigations of this issue at atomic scale is of significant because it can help us to clearly observe the morphology evolution of dendrite tip fundamentally, and specifically reveal the relationship between interface energy anisotropy and dendrite tip morphology. We investigate growth kinetics and morphology of dendrite tips at atomic scale by using phase-field crystal simulation. Atomic scale steady-state dendrite tips are obtained at different interface energy anisotropy and growth dri...
A novel orange–red emitting phosphor Sr3La(PO4)3:Ce3+, Mn2+ is synthesized by a high temperature ... more A novel orange–red emitting phosphor Sr3La(PO4)3:Ce3+, Mn2+ is synthesized by a high temperature solid state reaction, and its luminescent properties are investigated. The orange–red emission peaked at 605 nm of Mn2+ is greatly enhanced by the sensitizer Ce3+ due to efficient energy transfer from Ce3+ to Mn2+. The energy transfer is demonstrated to belong to a resonant type via a dipole–quadrupole mechanism. The critical distance for Ce3+–Mn2+ energy transfer is calculated to be 1.32 nm by concentration quenching method. The preliminary results indicate that Ce3+ ion may be a optimal sensitizer for the orange–red phosphor Sr3La(PO4)3:Mn2+.
Dalton transactions (Cambridge, England : 2003), Jan 8, 2015
A series of single-composition phosphors LiBaB9O15:Tb(3+),Eu(3+) have been prepared via a high-te... more A series of single-composition phosphors LiBaB9O15:Tb(3+),Eu(3+) have been prepared via a high-temperature solid-state reaction process. The structure and luminescence properties of phosphors are described. The LiBaB9O15:Tb(3+) phosphor shows a characteristic green emission, with the peak located at 551 nm, which corresponds to the (5)D4 → (7)F5 transition of Tb(3+). The LiBaB9O15:Eu(3+) phosphor presents an obvious red emission, with the peak located at 617 nm, which is ascribed to the (5)D0 → (7)F2 transition of Eu(3+). The highly intense red emission peaks of the Eu(3+) ions were attributed to an effective energy transfer from the Tb(3+) to Eu(3+) ions in LiBaB9O15:Tb(3+),Eu(3+), which has been verified through the luminescence spectra and the fluorescence decay dynamics. The results mean that LiBaB9O15:Tb(3+),Eu(3+) phosphors might have potential applications as a red emitting phosphor for white LEDs.
Ethernet has gained popularity for deploying in Metropolitan Area Networks (MANs) due to its ease... more Ethernet has gained popularity for deploying in Metropolitan Area Networks (MANs) due to its ease of management and highly cost effective. While the flat addressing scheme (i.e., non-hierarchical MAC addresses) and the broadcast based address resolution scheme simplify many aspects of configuration, they also bring poor scalability. This paper aims at developing an efficient and scalable Metro-Ethernet architecture. To achieve this goal, we propose a Distributed Registration based Address Resolution Protocol (DRARP) and an End user enabled Mac-in-Mac (EMiM) encapsulation scheme. DRARP solves an unknown address through unicast, and hence eliminates the broadcast messages. EMiM does Mac-in-Mac (MiM) encapsulation by end users instead of the Provider Edge (PE) nodes, thus significantly reducing the PE node's forwarding table size. The proposed architecture sustains the Ethernet's plug-and-play feature and provides high scalability. The simulation results show that the proposed ...
Metro Ethernet has recently attracted remarkable attention due to its simplicity and low cost. Al... more Metro Ethernet has recently attracted remarkable attention due to its simplicity and low cost. Although Ethernet is the dominant technology in the Local Area Network (LAN) which usually handles small number of nodes, when deploying in Metropolitan Area Networks (MANs), it faces certain challenges. One major challenge is its broadcasting based address resolution scheme. A broadcast-based address resolution scheme triggers many broadcast messages in a network, and hence make the Ethernet unscalable. This paper proposes a cache scheme, called Caching on Forwarding Table (CFT), to reduce broadcast messages for Metro Ethernet. CFT caches end user's Address Resolution Protocol (ARP) entries by inserting an IP address in each forwarding entry. If an ARP request is answered by a cached entry, the broadcast is stopped. Hence CFT can significantly reduce the broadcast messages in the network. We also discuss how to cache ARP entries in a Metro Ethernet using End User Enabled MAC-in-MAC (M...
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