Polarized magnetic system has a series of features, such as small volume, light weight, low power consumption, high sensitivity, quick movement and so on, widely used in the products of the military aerospace electrom...Polarized magnetic system has a series of features, such as small volume, light weight, low power consumption, high sensitivity, quick movement and so on, widely used in the products of the military aerospace electromagnetic relay. The typical polarized magnetic system has mainly four structures and its simplified equivalent magnetic circuits model is the base of the design of the electromagnetic relay with permanent magnet. In the past, the analysis method that people used was difficult to build the unified mathematical models, which divided the work gap magnetic flux into "permanent magnet flux" and "electromagnetic flux". Based on the analysis method of the work gap magnetic voltage, this paper founds the unified mathematical model of the polarized magnetic system and divides the attractive torque into permanent magnet torque, polarized torque and electromagnetic torque through the energy balance formula. It analyses the influence of permanent magnet sizes on permanent magnet torque, polarized torque and electromagnetic torque through the energy balance formula and the conclusions can direct the design of aerospace electromagnetic relay with permanent magnet.展开更多
To investigated the hemostatic ability of the S and F1-10 methods in clinical and ex vivo studies. METHODSThe hemostatic abilities of the two methods were analyzed retrospectively in all six gastric endoscopic submuco...To investigated the hemostatic ability of the S and F1-10 methods in clinical and ex vivo studies. METHODSThe hemostatic abilities of the two methods were analyzed retrospectively in all six gastric endoscopic submucosal dissection cases. The treated vessel diameter, compressed vessel frequency, and bleeding frequency after cutting the vessels were noted by the recorded videos. The coagulation mechanism of the two power settings was evaluated using the data recording program and histological examination on macro- and microscopic levels in the ex vivo experiments using porcine tissues. RESULTSF1-10 method showed a significantly better hemostatic ability for vessels ≥ 2 mm in diameter and a trend of overall better coagulation effect, evaluated by the bleeding rate after cutting the vessels. F1-10 method could sustain electrical current longer and effectively coagulate the tissue wider and deeper than the S method in the porcine model. CONCLUSIONF1-10 method is suggested to achieve a stronger hemostatic effect than the S method in clinical procedures and ex vivo models.展开更多
This paper attempts to reveal and solve problems in language teaching after discussing the issues of language change. It first discusses different models of English in the context of globalization. With detailed analy...This paper attempts to reveal and solve problems in language teaching after discussing the issues of language change. It first discusses different models of English in the context of globalization. With detailed analysis of their theoretical backgrounds, development and foundations, this paper classifies these models into three groups： dualism （i.e., dualic model）, trinalism （trinalic model） and monism （monic model）. Through comparison, Yoneoka’s English Umbrella Theory is found to be more comprehensive and is improved into a practical Revised English Umbrella （REU） with the notion of English as an International Language （EIL）. Second, the changing models in English education are briefly reviewed. Attention is paid to the Computer and Classroom-Based （CCB） Model of College English education because of new requirements for College English education. Students’ competence in cross-cultural communication is becoming more and more important in the EIL context. Finally, a modified CCB model is promoted with the REU, combining EIL and English Umbrella elements.展开更多
With the development of information technology in the past 10 years, computers have been widely used in the field of English teaching. This paper, based on a computer-mediated communication (CMC) program carried out i...With the development of information technology in the past 10 years, computers have been widely used in the field of English teaching. This paper, based on a computer-mediated communication (CMC) program carried out in Civil Aviation Flight University of China, aims to investigate the effectiveness of the use of online chat in college English teaching practice.展开更多
The need to simultaneously balance security and fairness in quantum key agreement(QKA) makes it challenging to design a flawless QKA protocol, especially a multiparty quantum key agreement(MQKA) protocol. When designi...The need to simultaneously balance security and fairness in quantum key agreement(QKA) makes it challenging to design a flawless QKA protocol, especially a multiparty quantum key agreement(MQKA) protocol. When designing an MQKA protocol,two modes can be used to transmit the quantum information carriers: travelling mode and distributed mode. MQKA protocols usually have a higher qubit efficiency in travelling mode than in distributed mode. Thus, several travelling mode MQKA protocols have been proposed. However, almost all of these are vulnerable to collusion attacks from internal betrayers. This paper proposes an improved MQKA protocol that operates in travelling mode with Einstein-Podolsky-Rosen pairs. More importantly, we present a new travelling mode MQKA protocol that uses single photons, which is more feasible than previous methods under current technologies.展开更多
The morphologies of monolayers containing Eu(TTA)3Phen (TTA=thenoyltrifluoroace-tone, Phen = 1, 10-phenanthroline) were studied at the air/liquid interface on different subphases by fluorescence microscopy (FM). The c...The morphologies of monolayers containing Eu(TTA)3Phen (TTA=thenoyltrifluoroace-tone, Phen = 1, 10-phenanthroline) were studied at the air/liquid interface on different subphases by fluorescence microscopy (FM). The composite subphase was the basic premise for the stable existence of the rare earth compound at air/liquid interface. The process that rare earth compound phase changes from liquid expanded state to liquid condensed state corresponded to a plateau in the π-A isotherm. In the pure Eu(TTA)3Phen monolayer, rod domains of Eu(TTA)3Phen formed and packed with no order. In the mixed monolayers with stearic acid (SA), phase transition of SA occurred first and formed domains with an electric gradient field, which induced the rare earth compound to form luminescent ring domains. Influence of intermolecular interaction on the self-organized microstructure was revealed.展开更多
基金Sponsored by Postdoctoral Fund of Heilongjiang Province (Grant NoLRB05 -002)
文摘Polarized magnetic system has a series of features, such as small volume, light weight, low power consumption, high sensitivity, quick movement and so on, widely used in the products of the military aerospace electromagnetic relay. The typical polarized magnetic system has mainly four structures and its simplified equivalent magnetic circuits model is the base of the design of the electromagnetic relay with permanent magnet. In the past, the analysis method that people used was difficult to build the unified mathematical models, which divided the work gap magnetic flux into "permanent magnet flux" and "electromagnetic flux". Based on the analysis method of the work gap magnetic voltage, this paper founds the unified mathematical model of the polarized magnetic system and divides the attractive torque into permanent magnet torque, polarized torque and electromagnetic torque through the energy balance formula. It analyses the influence of permanent magnet sizes on permanent magnet torque, polarized torque and electromagnetic torque through the energy balance formula and the conclusions can direct the design of aerospace electromagnetic relay with permanent magnet.
文摘To investigated the hemostatic ability of the S and F1-10 methods in clinical and ex vivo studies. METHODSThe hemostatic abilities of the two methods were analyzed retrospectively in all six gastric endoscopic submucosal dissection cases. The treated vessel diameter, compressed vessel frequency, and bleeding frequency after cutting the vessels were noted by the recorded videos. The coagulation mechanism of the two power settings was evaluated using the data recording program and histological examination on macro- and microscopic levels in the ex vivo experiments using porcine tissues. RESULTSF1-10 method showed a significantly better hemostatic ability for vessels ≥ 2 mm in diameter and a trend of overall better coagulation effect, evaluated by the bleeding rate after cutting the vessels. F1-10 method could sustain electrical current longer and effectively coagulate the tissue wider and deeper than the S method in the porcine model. CONCLUSIONF1-10 method is suggested to achieve a stronger hemostatic effect than the S method in clinical procedures and ex vivo models.
文摘This paper attempts to reveal and solve problems in language teaching after discussing the issues of language change. It first discusses different models of English in the context of globalization. With detailed analysis of their theoretical backgrounds, development and foundations, this paper classifies these models into three groups： dualism （i.e., dualic model）, trinalism （trinalic model） and monism （monic model）. Through comparison, Yoneoka’s English Umbrella Theory is found to be more comprehensive and is improved into a practical Revised English Umbrella （REU） with the notion of English as an International Language （EIL）. Second, the changing models in English education are briefly reviewed. Attention is paid to the Computer and Classroom-Based （CCB） Model of College English education because of new requirements for College English education. Students’ competence in cross-cultural communication is becoming more and more important in the EIL context. Finally, a modified CCB model is promoted with the REU, combining EIL and English Umbrella elements.
文摘With the development of information technology in the past 10 years, computers have been widely used in the field of English teaching. This paper, based on a computer-mediated communication (CMC) program carried out in Civil Aviation Flight University of China, aims to investigate the effectiveness of the use of online chat in college English teaching practice.
基金supported by the National Natural Science Foundation of China(Grant Nos.61501414,61602045,61601171,61309029,11504024 and 61502041)
文摘The need to simultaneously balance security and fairness in quantum key agreement(QKA) makes it challenging to design a flawless QKA protocol, especially a multiparty quantum key agreement(MQKA) protocol. When designing an MQKA protocol,two modes can be used to transmit the quantum information carriers: travelling mode and distributed mode. MQKA protocols usually have a higher qubit efficiency in travelling mode than in distributed mode. Thus, several travelling mode MQKA protocols have been proposed. However, almost all of these are vulnerable to collusion attacks from internal betrayers. This paper proposes an improved MQKA protocol that operates in travelling mode with Einstein-Podolsky-Rosen pairs. More importantly, we present a new travelling mode MQKA protocol that uses single photons, which is more feasible than previous methods under current technologies.
基金the Award Foundation for Excellent Young Scientists in Shandong Province and the Climbing Program.
文摘The morphologies of monolayers containing Eu(TTA)3Phen (TTA=thenoyltrifluoroace-tone, Phen = 1, 10-phenanthroline) were studied at the air/liquid interface on different subphases by fluorescence microscopy (FM). The composite subphase was the basic premise for the stable existence of the rare earth compound at air/liquid interface. The process that rare earth compound phase changes from liquid expanded state to liquid condensed state corresponded to a plateau in the π-A isotherm. In the pure Eu(TTA)3Phen monolayer, rod domains of Eu(TTA)3Phen formed and packed with no order. In the mixed monolayers with stearic acid (SA), phase transition of SA occurred first and formed domains with an electric gradient field, which induced the rare earth compound to form luminescent ring domains. Influence of intermolecular interaction on the self-organized microstructure was revealed.
