Increasing power demand,penetration of renew-ables,and limitations of necessary grid expansion are proffering new challenges to existing power system protection and control strategies.However,with the advancement in i...Increasing power demand,penetration of renew-ables,and limitations of necessary grid expansion are proffering new challenges to existing power system protection and control strategies.However,with the advancement in intelligent elec-tronic devices and relaying technology,fast,accurate and reliable protection schemes can be developed for smart power systems.In this paper,a new protection scheme based on admittance and power change has been proposed with dual-use line relays to detect symmetrical/asymmetrical faults in power systems.A large number of fault environments have been simulated by varying fault distances from relay location,fault resistance,and power angle in single machine infinite bus and WSCC 9-bus systems.Some crucial decisive fault scenarios e.g.close in/far end faults,faults in series compensated line,faults during asymmetrical swings,switching ON/OFF large loads,single and multi-modal swings have also been verified for the proposed index.In this paper,for the first time,detection of faults during power swings have been examined and verified in the presence of wind farms.The simulation results show the proficiency of the proposed algorithm for detecting faults in the presence or absence of power swings.展开更多
A complex network of factors contributes to neuroinflammation,such as infections,brain injuries and accumulation of toxic metabolites（Gendelman,2002）.Eicosanoids and several cytokines are the main mediators of infla...A complex network of factors contributes to neuroinflammation,such as infections,brain injuries and accumulation of toxic metabolites（Gendelman,2002）.Eicosanoids and several cytokines are the main mediators of inflammatory process;in fact,when an inflammatory condition persists,it can be responsible for the progression of degenerative diseases,展开更多
Dear Editor,Te Veterans Health Administration(VHA)provides healthcare for over 9 million enrolled veterans with approximately 2.7 million of those residing in rural areas[1].Te MISSION Act of 2018 emphasizes VHA colla...Dear Editor,Te Veterans Health Administration(VHA)provides healthcare for over 9 million enrolled veterans with approximately 2.7 million of those residing in rural areas[1].Te MISSION Act of 2018 emphasizes VHA collaboration with Federally Qualifed Healthcare Centers(FQHC)to serve rural residing veterans and nearly all existing collaborations involve arrangement of payment for community-based care by VHA to FQHCs.Unfortunately,there is a paucity of descriptive clinical data on existing cross-system collaborations which may help characterize these veterans and aid understanding of conditions for which they may receive treatment across systems.Such data has implications for workforce training,development,and resource allocation[2].Te objective of this report is to describe diferent clinical profles between two mutually exclusive samples:veterans engaged in FQHC only use,and VHA-enrolled veterans engaged in dual VHA and FQHC use.展开更多
Botanical morphological characteristics of Physalis alkekengi L.is first introduced,and its medicinal and edible value is elaborated.Cultivation techniques of P.alkekengi L.are mainly introduced.The research aims to p...Botanical morphological characteristics of Physalis alkekengi L.is first introduced,and its medicinal and edible value is elaborated.Cultivation techniques of P.alkekengi L.are mainly introduced.The research aims to provide a certain basis for the better development and application of P.alkekengi L.展开更多
In order to protect and develop the local resources of Gardenia jasminoides Ellis with Hunan characteristics,this paper uses the existing technology,analyzes the existing achievements in the cultivation of G.jasminoid...In order to protect and develop the local resources of Gardenia jasminoides Ellis with Hunan characteristics,this paper uses the existing technology,analyzes the existing achievements in the cultivation of G.jasminoides Ellis,investigates and analyzes the actual situation of the seedling base and cooperatives in Hunan,and collects the relevant index data related to the cultivation of G.jasminoides Ellis.This paper summarizes the practical techniques related to land selection,soil preparation,seedling breeding,afforestation technology,tending management,pest control and so on,in order to provide reference basis for planting and cultivateon and industrial development of G.jasminoides Ellis in Hunan.展开更多
We propose and experimentally demonstrate an ultra-fiat optical frequency comb （OFC） generator by a bal- anced driven dual parallel Mach-Zehnder modulator. Five- and seven-tone OFC with exactly equal intensity can b...We propose and experimentally demonstrate an ultra-fiat optical frequency comb （OFC） generator by a bal- anced driven dual parallel Mach-Zehnder modulator. Five- and seven-tone OFC with exactly equal intensity can be generated theoretically, Experimentally obtained five- and seven-tone OFC with flatness of 0.6 and 1.26 dB are demonstrated, respectively, which agrees well with the theoretical results.展开更多
A Fourier analysis applied to the Mach-Zehnder interferometer （MZI） transmission spectrum for simultaneous refractive index （RI） and temperature measurements is proposed and experimentally demonstrated in this Let...A Fourier analysis applied to the Mach-Zehnder interferometer （MZI） transmission spectrum for simultaneous refractive index （RI） and temperature measurements is proposed and experimentally demonstrated in this Letter. In the fast Fourier transform （FFT） spectrum of the MZI transmission spectrum, several frequency components are generally observed, which means that the transmission spectrum of the MZI is formed by the superposition of some dual-mode interference （DMI） spectra, and each frequency component represents different core-cladding interferences. We can select some dominant frequency components in the FFT spectrum of the MZI transmission spectrum to take the inverse FFT （IFFT）. Then, the corresponding DMI patterns can be obtained. Due to the shift of the wavelength of these DMI spectra with changes in the environmental parameters, we can use the coefficient matrix of these DMI spectra for multi-parameter sensing. In this Letter, two DMI patterns are separated from the resultant transmission spectrum of the MZI. As the RI and temperature change, the shifts of the two DMI patterns with respect to the RI and temperature will be observed. The sensitivities of the RI and temperature are -137.1806 nm/RIU （RI unit） and 0.0860 nm/℃, and -22.9955 nm/RIU and 0.0610 nm/℃ for the two DMIs. Accordingly, it can be used to simultaneously measure RI and temperature changes. The approach can eliminate the influence of multiple interferences and improve the accuracy of the sensor.展开更多
It is usually difficult to measure acoustic velocities through a casing, especially when the casing is poorly bonded with formation. An acoustic logging technique using the dual source of opposite polarity is proposed...It is usually difficult to measure acoustic velocities through a casing, especially when the casing is poorly bonded with formation. An acoustic logging technique using the dual source of opposite polarity is proposed to enhance the Signal to Noise Ratio of the formation signal and to reduce the casing wave in the data acquisition process. In what follows, a theoret- ical modeling is used to caculate the wavefroms of cased wells. And then, a scaled experiment was conducted in the 1：10 scaled experimental well using the proposed technique in the poorly- bonded condition. The results show that this technique can effectively suppress the casing wave and enhance the formation wave, even in the poorly-bonded condition. By analyzing the measured wavefroms, the amplitude of casing wave is reduced to 12% compared to the conventional one-source technique, and the compressional wave velocity can be easily obtained by using this technique. Both the theoretical modeling and experiment results demonstrate the feasibility of the proposed technique. This study establishes the theoretical and experimental foundation for the cased-hole, dual source of opposite polarity, acoustic logging tool development.展开更多
With the extensive development of globalization,biosafety risks exhibit the characteristics of faster speed,more concealed paths,and wider scope.Currently,issues such as the cross-border spread of emerging infectious ...With the extensive development of globalization,biosafety risks exhibit the characteristics of faster speed,more concealed paths,and wider scope.Currently,issues such as the cross-border spread of emerging infectious diseases and major animal and plant epidemics,the accelerated dissemination of antimicrobial resis-tance,the persistent illegal trade of biological resources,the poten-tial threats of misuse and abuse of dual-use biotechnology,the occasional risks of bioterrorism,and the dual risks of safety and security of biosafety laboratories have transcended national bor-ders and become systemic challenges that require urgent global coordination to address.展开更多
Reverse genetics via targeted modification of gene sequences to obtain a phenotype and the inference of a gene's function or regulatory mechanism is widely used as a potent tool in viral biology and application.Ho...Reverse genetics via targeted modification of gene sequences to obtain a phenotype and the inference of a gene's function or regulatory mechanism is widely used as a potent tool in viral biology and application.However,while reverse genetics has contributed significantly to our understanding of molecular biology and the pathogenesis of viruses,its accessibility(operation)and openness(data)have raised many concerns regarding biosafety and biosecurity.In this review,we retrospectively examine the development of reverse genetics and its applications in virology,then emphasize global biosafety and biosecurity concerns regarding reverse genetics,and summarize global regulations,governance,and laws on reverse genetics.This review seeks to enhance our understanding and rational application of reverse genetics technology for the benefit of humankind.展开更多
文摘Increasing power demand,penetration of renew-ables,and limitations of necessary grid expansion are proffering new challenges to existing power system protection and control strategies.However,with the advancement in intelligent elec-tronic devices and relaying technology,fast,accurate and reliable protection schemes can be developed for smart power systems.In this paper,a new protection scheme based on admittance and power change has been proposed with dual-use line relays to detect symmetrical/asymmetrical faults in power systems.A large number of fault environments have been simulated by varying fault distances from relay location,fault resistance,and power angle in single machine infinite bus and WSCC 9-bus systems.Some crucial decisive fault scenarios e.g.close in/far end faults,faults in series compensated line,faults during asymmetrical swings,switching ON/OFF large loads,single and multi-modal swings have also been verified for the proposed index.In this paper,for the first time,detection of faults during power swings have been examined and verified in the presence of wind farms.The simulation results show the proficiency of the proposed algorithm for detecting faults in the presence or absence of power swings.
文摘A complex network of factors contributes to neuroinflammation,such as infections,brain injuries and accumulation of toxic metabolites（Gendelman,2002）.Eicosanoids and several cytokines are the main mediators of inflammatory process;in fact,when an inflammatory condition persists,it can be responsible for the progression of degenerative diseases,
基金supported in part by an award from the VHA Office of Rural Health,Veterans Rural Health Resource CenterDIowa City(VRHRC-IC),Iowa City VA Health Care System,Iowa City,IA(Award#7345)。
文摘Dear Editor,Te Veterans Health Administration(VHA)provides healthcare for over 9 million enrolled veterans with approximately 2.7 million of those residing in rural areas[1].Te MISSION Act of 2018 emphasizes VHA collaboration with Federally Qualifed Healthcare Centers(FQHC)to serve rural residing veterans and nearly all existing collaborations involve arrangement of payment for community-based care by VHA to FQHCs.Unfortunately,there is a paucity of descriptive clinical data on existing cross-system collaborations which may help characterize these veterans and aid understanding of conditions for which they may receive treatment across systems.Such data has implications for workforce training,development,and resource allocation[2].Te objective of this report is to describe diferent clinical profles between two mutually exclusive samples:veterans engaged in FQHC only use,and VHA-enrolled veterans engaged in dual VHA and FQHC use.
文摘Botanical morphological characteristics of Physalis alkekengi L.is first introduced,and its medicinal and edible value is elaborated.Cultivation techniques of P.alkekengi L.are mainly introduced.The research aims to provide a certain basis for the better development and application of P.alkekengi L.
基金Supported by Changsha Science and Technology Project(kq1801028)Major Landmark Innovation Demonstration Project(2019XK2002).
文摘In order to protect and develop the local resources of Gardenia jasminoides Ellis with Hunan characteristics,this paper uses the existing technology,analyzes the existing achievements in the cultivation of G.jasminoides Ellis,investigates and analyzes the actual situation of the seedling base and cooperatives in Hunan,and collects the relevant index data related to the cultivation of G.jasminoides Ellis.This paper summarizes the practical techniques related to land selection,soil preparation,seedling breeding,afforestation technology,tending management,pest control and so on,in order to provide reference basis for planting and cultivateon and industrial development of G.jasminoides Ellis in Hunan.
文摘We propose and experimentally demonstrate an ultra-fiat optical frequency comb （OFC） generator by a bal- anced driven dual parallel Mach-Zehnder modulator. Five- and seven-tone OFC with exactly equal intensity can be generated theoretically, Experimentally obtained five- and seven-tone OFC with flatness of 0.6 and 1.26 dB are demonstrated, respectively, which agrees well with the theoretical results.
基金supported by the National Natural Science Foundation of China(Nos.61327012 and 61275088)the Research Foundation of Education Bureau of Shaanxi Province,China(No.14JS073)+2 种基金the Youth Science and Technology Innovation Fund of Xi’an Shiyou University(No.2014QN005)the Excellent MA Theses Fund of Xi’an Shiyou University(No.2014yp130816)the Graduate Student Innovation Fund(No.2014cx130842)
文摘A Fourier analysis applied to the Mach-Zehnder interferometer （MZI） transmission spectrum for simultaneous refractive index （RI） and temperature measurements is proposed and experimentally demonstrated in this Letter. In the fast Fourier transform （FFT） spectrum of the MZI transmission spectrum, several frequency components are generally observed, which means that the transmission spectrum of the MZI is formed by the superposition of some dual-mode interference （DMI） spectra, and each frequency component represents different core-cladding interferences. We can select some dominant frequency components in the FFT spectrum of the MZI transmission spectrum to take the inverse FFT （IFFT）. Then, the corresponding DMI patterns can be obtained. Due to the shift of the wavelength of these DMI spectra with changes in the environmental parameters, we can use the coefficient matrix of these DMI spectra for multi-parameter sensing. In this Letter, two DMI patterns are separated from the resultant transmission spectrum of the MZI. As the RI and temperature change, the shifts of the two DMI patterns with respect to the RI and temperature will be observed. The sensitivities of the RI and temperature are -137.1806 nm/RIU （RI unit） and 0.0860 nm/℃, and -22.9955 nm/RIU and 0.0610 nm/℃ for the two DMIs. Accordingly, it can be used to simultaneously measure RI and temperature changes. The approach can eliminate the influence of multiple interferences and improve the accuracy of the sensor.
基金supported by the National Natural Science Foundation for the Youth of China(41204070)
文摘It is usually difficult to measure acoustic velocities through a casing, especially when the casing is poorly bonded with formation. An acoustic logging technique using the dual source of opposite polarity is proposed to enhance the Signal to Noise Ratio of the formation signal and to reduce the casing wave in the data acquisition process. In what follows, a theoret- ical modeling is used to caculate the wavefroms of cased wells. And then, a scaled experiment was conducted in the 1：10 scaled experimental well using the proposed technique in the poorly- bonded condition. The results show that this technique can effectively suppress the casing wave and enhance the formation wave, even in the poorly-bonded condition. By analyzing the measured wavefroms, the amplitude of casing wave is reduced to 12% compared to the conventional one-source technique, and the compressional wave velocity can be easily obtained by using this technique. Both the theoretical modeling and experiment results demonstrate the feasibility of the proposed technique. This study establishes the theoretical and experimental foundation for the cased-hole, dual source of opposite polarity, acoustic logging tool development.
文摘With the extensive development of globalization,biosafety risks exhibit the characteristics of faster speed,more concealed paths,and wider scope.Currently,issues such as the cross-border spread of emerging infectious diseases and major animal and plant epidemics,the accelerated dissemination of antimicrobial resis-tance,the persistent illegal trade of biological resources,the poten-tial threats of misuse and abuse of dual-use biotechnology,the occasional risks of bioterrorism,and the dual risks of safety and security of biosafety laboratories have transcended national bor-ders and become systemic challenges that require urgent global coordination to address.
文摘Reverse genetics via targeted modification of gene sequences to obtain a phenotype and the inference of a gene's function or regulatory mechanism is widely used as a potent tool in viral biology and application.However,while reverse genetics has contributed significantly to our understanding of molecular biology and the pathogenesis of viruses,its accessibility(operation)and openness(data)have raised many concerns regarding biosafety and biosecurity.In this review,we retrospectively examine the development of reverse genetics and its applications in virology,then emphasize global biosafety and biosecurity concerns regarding reverse genetics,and summarize global regulations,governance,and laws on reverse genetics.This review seeks to enhance our understanding and rational application of reverse genetics technology for the benefit of humankind.
