Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some par...Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some parameter estimation issues over conventional modulation schemes. In this paper, a novel transform termed as Discrete Sinusoidal Frequency Modulation transform(DSFMT) is proposed. Then, the DSFMT of SNCK signal is deduced and classified into three types, based on which, the time-bandwidth product is estimated by the proposed algorithm. Simulation results show that the noise has a signifi cant impact on the localization of the peak value and the time-bandwidth product can be estimated by using local ratio values when.展开更多
For a specific combustion problem involving calculations of several species at the equilibrium state, it is simpler to write a general computer program and calculate the combustion concentration. Original work describ...For a specific combustion problem involving calculations of several species at the equilibrium state, it is simpler to write a general computer program and calculate the combustion concentration. Original work describes, an adaptation of Newton-Raphson method was used for solving the highly nonlinear system of equations describing the formation of equilibrium products in reacting of fuel-additive-air mixtures. This study also shows what possible of the results. In this paper, to be present the efficient numerical algorithms for. solving the combustion problem, to be used nonlinear equations based on the iteration method and high order of the Taylor series. The modified Adomian decomposition method was applied to construct the numerical algorithms. Some numerical illustrations are given to show the efficiency of algorithms. Comparisons of results by the new Matlab routines and previous routines, the result data indicate that the new Matlab routines are reliable, typical deviations from previous results are less than 0.05%.展开更多
Non-linear crystal materials BBO and LBO stand for the low-temperature phases of barium metaborate beta-BaB<sub>2</sub>O<sub>4</sub> and lithium triborate LiB<sub>3</sub>O<sub>...Non-linear crystal materials BBO and LBO stand for the low-temperature phases of barium metaborate beta-BaB<sub>2</sub>O<sub>4</sub> and lithium triborate LiB<sub>3</sub>O<sub>2</sub>. Both are hi-tech products marketed by the Fujian Castech Crystals Inc., a business entity affiliated to the CAS. The successful development of the two was honoured with a special prize, a first-grade prize and a second-grade prize of the CAS Awards for S&T Progress in 1986, 1989 and 1990 respectively. Also, they were crowned with a prize of the展开更多
As one of the Analysis Centers(AC)of the International GNSS Service(IGS),Wuhan University(WHU)has been contributing to the IGS by providing ultra-rapid as well as rapid orbit and clock solutions for the established GP...As one of the Analysis Centers(AC)of the International GNSS Service(IGS),Wuhan University(WHU)has been contributing to the IGS by providing ultra-rapid as well as rapid orbit and clock solutions for the established GPS and GLONASS since 2012.In the same year,the IGS initiated the Multi-GNSS Experiment(MGEX)to support the analysis of the emerging GNSS systems and prepare the IGS for Multi-GNSS,which includes GPS,GLONASS,the European Galileo system,the Chinese Beidou Navigation Satellite System(BDS),the Japanese Quasi-Zenith Satellite System(QZSS)and the Indian Regional Navigation Satellite System(IRNSS/NaVIC).The major products,i.e.,orbits,Earth Orientation Parameters(EOPs),satellite clock as well as attitude have also been provided by WHU since 2012.More recently,WHU has engaged the third reprocessing of IGS for generating the highly accurate station coordinates as inputs for establishment of the International Terrestrial Reference Frame(ITRF)2020 during 2019—2020.This article presents the recent major advancements of the IGS AC at Wuhan University,including precise products,real-time products,bias products,antenna phase center calibration,and the non-linear motion modeling for GNSS Reference Stations.展开更多
The stability of Non-Linear Feedback Shift Registers(NFSRs)plays an important role in the cryptographic security.Due to the complexity of nonlinear systems and the lack of efficient algebraic tools,the theorems relate...The stability of Non-Linear Feedback Shift Registers(NFSRs)plays an important role in the cryptographic security.Due to the complexity of nonlinear systems and the lack of efficient algebraic tools,the theorems related to the stability of NFSRs are still not well-developed.In this paper,we view the NFSR with periodic inputs as a Boolean control network.Based on the mathematical tool of semi-tensor product(STP),the Boolean network can be mapped into an algebraic form.Through these basic theories,we analyze the state space of non-autonomous NFSRs,and discuss the stability of an NFSR with periodic inputs of limited length or unlimited length.The simulation results are provided to prove the efficiency of the model.Based on these works,we can provide a method to analyze the stability of the NFSR with periodic input,including limited length and unlimited length.By this,we can efficiently reduce the computational complexity,and its efficiency is demonstrated by applying the theorem in simulations dealing with the stability of a non-autonomous NFSR.展开更多
With the global rise of Web 2.0 a completely new type of business models—business platforms has arisen and nowadays Amazon,Apple,Google,Facebook are convincingly taking over the lead in global business world(Simon,20...With the global rise of Web 2.0 a completely new type of business models—business platforms has arisen and nowadays Amazon,Apple,Google,Facebook are convincingly taking over the lead in global business world(Simon,2011).These four flagship business platforms are followed by countless other platforms in all spheres of business and contemporary life(eBay,Airbnb,Uber,etc.).However,the MBA study courses that could cover all sides of business platform microeconomics and explain their enormous economical success are rarely provided in Europe and still not existed in many countries including Latvia.This paper describes the author’s research of specific microeconomics characteristics of business platforms,the different ways of thinking in marketing,competition and money making strategies in business platforms,platform business determinants,detailed comparison of traditional(“pipe”)business models and business platforms,the strengths and weaknesses of platform business models.As the result of this research,author has elaborated the original MBA study course—“Business Platform Microeconomics”and its detailed plan is attached in references of this paper1.In conclusions,author expressed how specifics of business platform microeconomics define completely different main components of the business model in business platforms in comparison to traditional“pipe”type business models,what is explaining the enormous economic success of this new business model—business platforms.展开更多
The dot product of bases vectors on the super-surface of constraints of the nonlinear non-holonomic space and Mesherskii equations may act as the equations of fundamental dynamics of mechanical system for the variable...The dot product of bases vectors on the super-surface of constraints of the nonlinear non-holonomic space and Mesherskii equations may act as the equations of fundamental dynamics of mechanical system for the variable mass.These are very simple and convenient for computation.From these known equations,the equations of Chaplygin,Nielson,Appell,Mac-Millan et al.are deriv d;it is unnecessary to introduce the definition if Appell-Chetaev or Niu Qinping for the virtual displacement.These are compatible with the D'Alembert-Lagrange's principle.展开更多
We study queueing networks with instantaneous transitions of sequential batch departures and sequential batch arrivals. Unlike most of the existing models, this network is shown not to have a product form solution. An...We study queueing networks with instantaneous transitions of sequential batch departures and sequential batch arrivals. Unlike most of the existing models, this network is shown not to have a product form solution. An "extra arrival condition" is introduced under which the network is shown to possess a product form stationary distribution. Fur- thermore, the product form solution serves as a stochastic upper bound for the original network without the extra arrival process. The results include many queueing network models reported in the literature, e.g. the assembly transfer networks recently introduced by Miyazawa and Taylor, as special cases. We show that the network with the extra arrival process is "structurally reversible" in the sense that its reversed process has the same network structure. Local balances for this network are presented and discussed.展开更多
基金supported by Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory(KX152600015/ITD-U15006)National Natural Science Foundation of China(No.61401196)
文摘Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some parameter estimation issues over conventional modulation schemes. In this paper, a novel transform termed as Discrete Sinusoidal Frequency Modulation transform(DSFMT) is proposed. Then, the DSFMT of SNCK signal is deduced and classified into three types, based on which, the time-bandwidth product is estimated by the proposed algorithm. Simulation results show that the noise has a signifi cant impact on the localization of the peak value and the time-bandwidth product can be estimated by using local ratio values when.
文摘For a specific combustion problem involving calculations of several species at the equilibrium state, it is simpler to write a general computer program and calculate the combustion concentration. Original work describes, an adaptation of Newton-Raphson method was used for solving the highly nonlinear system of equations describing the formation of equilibrium products in reacting of fuel-additive-air mixtures. This study also shows what possible of the results. In this paper, to be present the efficient numerical algorithms for. solving the combustion problem, to be used nonlinear equations based on the iteration method and high order of the Taylor series. The modified Adomian decomposition method was applied to construct the numerical algorithms. Some numerical illustrations are given to show the efficiency of algorithms. Comparisons of results by the new Matlab routines and previous routines, the result data indicate that the new Matlab routines are reliable, typical deviations from previous results are less than 0.05%.
文摘Non-linear crystal materials BBO and LBO stand for the low-temperature phases of barium metaborate beta-BaB<sub>2</sub>O<sub>4</sub> and lithium triborate LiB<sub>3</sub>O<sub>2</sub>. Both are hi-tech products marketed by the Fujian Castech Crystals Inc., a business entity affiliated to the CAS. The successful development of the two was honoured with a special prize, a first-grade prize and a second-grade prize of the CAS Awards for S&T Progress in 1986, 1989 and 1990 respectively. Also, they were crowned with a prize of the
基金National Natural Science Foundation of China(Nos.42030109,42074032)Program for Hubei Provincial Science and Technology Innovation Talants(No.2022EJD010)。
文摘As one of the Analysis Centers(AC)of the International GNSS Service(IGS),Wuhan University(WHU)has been contributing to the IGS by providing ultra-rapid as well as rapid orbit and clock solutions for the established GPS and GLONASS since 2012.In the same year,the IGS initiated the Multi-GNSS Experiment(MGEX)to support the analysis of the emerging GNSS systems and prepare the IGS for Multi-GNSS,which includes GPS,GLONASS,the European Galileo system,the Chinese Beidou Navigation Satellite System(BDS),the Japanese Quasi-Zenith Satellite System(QZSS)and the Indian Regional Navigation Satellite System(IRNSS/NaVIC).The major products,i.e.,orbits,Earth Orientation Parameters(EOPs),satellite clock as well as attitude have also been provided by WHU since 2012.More recently,WHU has engaged the third reprocessing of IGS for generating the highly accurate station coordinates as inputs for establishment of the International Terrestrial Reference Frame(ITRF)2020 during 2019—2020.This article presents the recent major advancements of the IGS AC at Wuhan University,including precise products,real-time products,bias products,antenna phase center calibration,and the non-linear motion modeling for GNSS Reference Stations.
基金This work is supported by the National Natural Science Foundation of China(Grants Nos.61672020,U1803263,61662069,61762068,31560622,31260538,30960246,31672385,71761029)Project funded by China Postdoctoral Science Foundation(2013M542560,2015T81129)+6 种基金A Project of Shandong Province Higher Educational Science and Technology Program(No.J16LN61)Inner Mongolia Colleges and Universities Scientific and Technological Research Projects(Grant No.NJZC17148)CERNET Innovation Project(No.NGII20161209)Natural Science Foundation of Inner Mongolia Autonomous Region of china(No.2017MS0610,No.2017MS717)Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region(No.NJYT-18-A13)Inner Mongolia Key Laboratory of economic data analysis and mining China-Mongolia Scientific Research Capacity Building of Incubator,Joint Laboratory and Technology Transfer Center,Education research project of national finance and economics(No.MZCJYB1803)Postgraduate research and innovation project of Inner Mongolia university of finance and economics.
文摘The stability of Non-Linear Feedback Shift Registers(NFSRs)plays an important role in the cryptographic security.Due to the complexity of nonlinear systems and the lack of efficient algebraic tools,the theorems related to the stability of NFSRs are still not well-developed.In this paper,we view the NFSR with periodic inputs as a Boolean control network.Based on the mathematical tool of semi-tensor product(STP),the Boolean network can be mapped into an algebraic form.Through these basic theories,we analyze the state space of non-autonomous NFSRs,and discuss the stability of an NFSR with periodic inputs of limited length or unlimited length.The simulation results are provided to prove the efficiency of the model.Based on these works,we can provide a method to analyze the stability of the NFSR with periodic input,including limited length and unlimited length.By this,we can efficiently reduce the computational complexity,and its efficiency is demonstrated by applying the theorem in simulations dealing with the stability of a non-autonomous NFSR.
文摘With the global rise of Web 2.0 a completely new type of business models—business platforms has arisen and nowadays Amazon,Apple,Google,Facebook are convincingly taking over the lead in global business world(Simon,2011).These four flagship business platforms are followed by countless other platforms in all spheres of business and contemporary life(eBay,Airbnb,Uber,etc.).However,the MBA study courses that could cover all sides of business platform microeconomics and explain their enormous economical success are rarely provided in Europe and still not existed in many countries including Latvia.This paper describes the author’s research of specific microeconomics characteristics of business platforms,the different ways of thinking in marketing,competition and money making strategies in business platforms,platform business determinants,detailed comparison of traditional(“pipe”)business models and business platforms,the strengths and weaknesses of platform business models.As the result of this research,author has elaborated the original MBA study course—“Business Platform Microeconomics”and its detailed plan is attached in references of this paper1.In conclusions,author expressed how specifics of business platform microeconomics define completely different main components of the business model in business platforms in comparison to traditional“pipe”type business models,what is explaining the enormous economic success of this new business model—business platforms.
文摘The dot product of bases vectors on the super-surface of constraints of the nonlinear non-holonomic space and Mesherskii equations may act as the equations of fundamental dynamics of mechanical system for the variable mass.These are very simple and convenient for computation.From these known equations,the equations of Chaplygin,Nielson,Appell,Mac-Millan et al.are deriv d;it is unnecessary to introduce the definition if Appell-Chetaev or Niu Qinping for the virtual displacement.These are compatible with the D'Alembert-Lagrange's principle.
基金Research partially supported by NSF under grants DMI-9908294 and DMI-0196084.
文摘We study queueing networks with instantaneous transitions of sequential batch departures and sequential batch arrivals. Unlike most of the existing models, this network is shown not to have a product form solution. An "extra arrival condition" is introduced under which the network is shown to possess a product form stationary distribution. Fur- thermore, the product form solution serves as a stochastic upper bound for the original network without the extra arrival process. The results include many queueing network models reported in the literature, e.g. the assembly transfer networks recently introduced by Miyazawa and Taylor, as special cases. We show that the network with the extra arrival process is "structurally reversible" in the sense that its reversed process has the same network structure. Local balances for this network are presented and discussed.
