Amorphous forms of C will first be compared and contrasted with amorphous Si, the differences in chemical bonding being emphasized in relation to atomic structure. After a brief discussion of ordered layers of graphit...Amorphous forms of C will first be compared and contrasted with amorphous Si, the differences in chemical bonding being emphasized in relation to atomic structure. After a brief discussion of ordered layers of graphite and of BN, some attention will be focused on BN cages and polymers and on C nanotubes. Finally properties of Na metal clusters will be discussed, including fission of such charged clusters展开更多
special(1y),especial(ly),particular(ly)和 specifical(ly)出现率较高,而且都具有“特殊”的意思,容易混淆,现试辨它们之间的异同。1.special:①特别的,特殊的,表示某物特殊,比其同类事物更重要或更好(more important or better than ...special(1y),especial(ly),particular(ly)和 specifical(ly)出现率较高,而且都具有“特殊”的意思,容易混淆,现试辨它们之间的异同。1.special:①特别的,特殊的,表示某物特殊,比其同类事物更重要或更好(more important or better than other things of its kind)。例如:Would she be prepared to undertake a special job for the organization?她愿意并且能够担任机构的一项特殊工作吗?What is so special about the year 2000?2000年有什么特殊意义吗?I had no special reason to confide in him.展开更多
The Sliding Bike is a patented new product that perfectly combines bike functionality and mechanical principles.Our models before 2014 used only horizontal sliding mechanism,and they were awarded invention golden meda...The Sliding Bike is a patented new product that perfectly combines bike functionality and mechanical principles.Our models before 2014 used only horizontal sliding mechanism,and they were awarded invention golden medals in Seoul,Geneva,Pittsburgh,and Taipei,and the Japan GD展开更多
A father worked as an accountant for the Air National Guard.Despite a regular adequate income hehad a “poor” mindset,always unhappy about money matters and very veal about it.One year at an air show,in a crowd of ma...A father worked as an accountant for the Air National Guard.Despite a regular adequate income hehad a “poor” mindset,always unhappy about money matters and very veal about it.One year at an air show,in a crowd of many close-by people,his daughter looked up at him andsaid,“Dad,what do you do out here?”展开更多
Autism spectrum disorder(ASD)is a group of heterogeneous,multi-factorial,neurodevelopmental disorders resulting from genetic and environmental factors interplay.Infection is a significant trigger of autism,especially ...Autism spectrum disorder(ASD)is a group of heterogeneous,multi-factorial,neurodevelopmental disorders resulting from genetic and environmental factors interplay.Infection is a significant trigger of autism,especially during the critical developmental period.There is a strong interplay between the viral infection as a trigger and a result of ASD.We aim to highlight the mutual relationship between autism and viruses.We performed a thorough literature review and included 158 research in this review.Most of the literature agreed on the possible effects of the viral infection during the critical period of development on the risk of developing autism,especially for specific viral infections such as Rubella,Cytomegalovirus,Herpes Simplex virus,Varicella Zoster Virus,Influenza virus,Zika virus,and severe acute respiratory syndrome coronavirus 2.Viral infection directly infects the brain,triggers immune activation,induces epigenetic changes,and raises the risks of having a child with autism.At the same time,there is some evidence of increased risk of infection,including viral infections in children with autism,due to lots of factors.There is an increased risk of developing autism with a specific viral infection during the early developmental period and an increased risk of viral infections in children with autism.In addition,children with autism are at increased risk of infection,including viruses.Every effort should be made to prevent maternal and early-life infections and reduce the risk of autism.Immune modulation of children with autism should be considered to reduce the risk of infection.展开更多
振荡器的频率稳定度在时域一般用阿伦方差表征,在频域一般用相位噪声谱密度函数表征,两者存在一定的数学转换关系,即可以由频域测量的相位噪声谱密度函数转换为时域的阿伦方差.t<0.1 ms时短期频率稳定度的时域测量非常困难.利用两者...振荡器的频率稳定度在时域一般用阿伦方差表征,在频域一般用相位噪声谱密度函数表征,两者存在一定的数学转换关系,即可以由频域测量的相位噪声谱密度函数转换为时域的阿伦方差.t<0.1 ms时短期频率稳定度的时域测量非常困难.利用两者之间的转换关系对振荡器的时域稳定度进行了间接测量,并用实测数据进行了验证.
Abstract：
Frequency stability of oscillator commonly can be denoted by Allan variance in time domain, and by phase noise power spectrum density function in frequency domain. There is a definite transform relation of mathematics, it is to say that Allan variance of time domain can be obtained by transforming phase noise power spectrum density function, especially it is more applicable when τ < 0. 1 ms because it is very difficult to measure short - term frequency stability in time domain. The transformation relation between the two denotations of short-term frequency is used to measure Allan variance indirectly and validated by measured data.展开更多
Through analysis we found that some mesoscale anomalous regions (10 1～10 2 km) of meteorological parameters such as the special drought areas, unusual warm areas, the largest snowfall center, low pressure area toge...Through analysis we found that some mesoscale anomalous regions (10 1～10 2 km) of meteorological parameters such as the special drought areas, unusual warm areas, the largest snowfall center, low pressure area together with the epicenter area of M S=6.2 Zhangbei earthquake on January 10, 1998 are located at the same area, i.e. there appears the ″Five areas corresponding″ phenomenon. Meanwhile, three times of low pressure evolution are generated and develop in the earthquake area in five days after the occurrence of the earthquake. The abnormal variation of the lower limit of frozen soil layer shows indirectly that unusual warm in earthquake areas are related to the upward thermal conduction from the deeper layer of earth surface.展开更多
Exploring the human brain is perhaps the most challenging and fascinating scientific issue in the 21st century.It will facilitate the development of various aspects of the society,including economics,education,health ...Exploring the human brain is perhaps the most challenging and fascinating scientific issue in the 21st century.It will facilitate the development of various aspects of the society,including economics,education,health care,national defense and daily life.The artificial intelligence techniques are becoming useful as an alternate method of classical techniques or as a component of an integrated system.They are used to solve complicated problems in various fields and becoming increasingly popular nowadays.Especially,the investigation of human brain will promote the artificial intelligence techniques,utilizing the accumulating knowledge of neuroscience,brain-machine interface techniques,algorithms of spiking neural networks and neuromorphic supercomputers.Consequently,we provide a comprehensive survey of the research and motivations for brain-inspired artificial intelligence and its engineering over its history.The goals of this work are to provide a brief review of the research associated with brain-inspired artificial intelligence and its related engineering techniques,and to motivate further work by elucidating challenges in the field where new researches are required.展开更多
A majority of contemporary Chinese historians focus on the so-called Capitalist sprouts to analyze the historical trends and potentials of late imperial China until late twentieth century.Some Western historians,on th...A majority of contemporary Chinese historians focus on the so-called Capitalist sprouts to analyze the historical trends and potentials of late imperial China until late twentieth century.Some Western historians,on the other hand,proposed several alternative approaches to overcome the obvious Eurocentric nature of these Capitalist sprouts approaches.Following a brief discussion of the problems with both approaches,this article argues that in terms of social structural and historical trends,late imperial China during the Ming and early Qing period should be taken as an imperial agro-mercantile society with unique structural features and potentials.To present such a hypothesis,this article,first of all,identifies the major novelties as well as irreversible and structural changes in the economic sector during the Ming and early Qing period to confirm that late imperial China was a society with significant development,rather than stagnation.Secondly,it points out that when profound changes were happening,mainly in the economic sector,the imperial rule was enhanced rather than being weakened or disintegrated by these changes in economy.Thirdly,the paper highlights the main features of the agro-mercantile society indicating that this is a changing society profoundly different from the contemporary West in terms of structure and potentials.展开更多
The basic concepts about the active structures and some attributes of the modes were presented in paper “Liner Active Structures and Modes]( I) ". The characteristics of the active discrete systems and active be...The basic concepts about the active structures and some attributes of the modes were presented in paper “Liner Active Structures and Modes]( I) ". The characteristics of the active discrete systems and active beams were discussed, especially, the stability of the active structures and the orthogonality of the eigenvectors. The notes about modes were portrayed by a model of a seven-storeyed building with sensors and actuators. The concept of the adjoint active structure was extended from the discrete systems to the beams that were the representations of the continuous structures. Two types of beams with different placements of the measuring and actuating systems were discussed in detail. One is the beam with the discrete sensors and actuators, and the other is the beam with distributed sensor and actuator function. The orthogonality conditions were derived with the modal shapes of the active beam and its adjoint active beam. An example shows that the variation of eigenvalues with feedback amplitude for the homo-configuration and non-homo-configuration active structures.展开更多
文摘Amorphous forms of C will first be compared and contrasted with amorphous Si, the differences in chemical bonding being emphasized in relation to atomic structure. After a brief discussion of ordered layers of graphite and of BN, some attention will be focused on BN cages and polymers and on C nanotubes. Finally properties of Na metal clusters will be discussed, including fission of such charged clusters
文摘special(1y),especial(ly),particular(ly)和 specifical(ly)出现率较高,而且都具有“特殊”的意思,容易混淆,现试辨它们之间的异同。1.special:①特别的,特殊的,表示某物特殊,比其同类事物更重要或更好(more important or better than other things of its kind)。例如:Would she be prepared to undertake a special job for the organization?她愿意并且能够担任机构的一项特殊工作吗?What is so special about the year 2000?2000年有什么特殊意义吗?I had no special reason to confide in him.
文摘The Sliding Bike is a patented new product that perfectly combines bike functionality and mechanical principles.Our models before 2014 used only horizontal sliding mechanism,and they were awarded invention golden medals in Seoul,Geneva,Pittsburgh,and Taipei,and the Japan GD
文摘A father worked as an accountant for the Air National Guard.Despite a regular adequate income hehad a “poor” mindset,always unhappy about money matters and very veal about it.One year at an air show,in a crowd of many close-by people,his daughter looked up at him andsaid,“Dad,what do you do out here?”
文摘Autism spectrum disorder(ASD)is a group of heterogeneous,multi-factorial,neurodevelopmental disorders resulting from genetic and environmental factors interplay.Infection is a significant trigger of autism,especially during the critical developmental period.There is a strong interplay between the viral infection as a trigger and a result of ASD.We aim to highlight the mutual relationship between autism and viruses.We performed a thorough literature review and included 158 research in this review.Most of the literature agreed on the possible effects of the viral infection during the critical period of development on the risk of developing autism,especially for specific viral infections such as Rubella,Cytomegalovirus,Herpes Simplex virus,Varicella Zoster Virus,Influenza virus,Zika virus,and severe acute respiratory syndrome coronavirus 2.Viral infection directly infects the brain,triggers immune activation,induces epigenetic changes,and raises the risks of having a child with autism.At the same time,there is some evidence of increased risk of infection,including viral infections in children with autism,due to lots of factors.There is an increased risk of developing autism with a specific viral infection during the early developmental period and an increased risk of viral infections in children with autism.In addition,children with autism are at increased risk of infection,including viruses.Every effort should be made to prevent maternal and early-life infections and reduce the risk of autism.Immune modulation of children with autism should be considered to reduce the risk of infection.
文摘振荡器的频率稳定度在时域一般用阿伦方差表征,在频域一般用相位噪声谱密度函数表征,两者存在一定的数学转换关系,即可以由频域测量的相位噪声谱密度函数转换为时域的阿伦方差.t<0.1 ms时短期频率稳定度的时域测量非常困难.利用两者之间的转换关系对振荡器的时域稳定度进行了间接测量,并用实测数据进行了验证.
Abstract：
Frequency stability of oscillator commonly can be denoted by Allan variance in time domain, and by phase noise power spectrum density function in frequency domain. There is a definite transform relation of mathematics, it is to say that Allan variance of time domain can be obtained by transforming phase noise power spectrum density function, especially it is more applicable when τ < 0. 1 ms because it is very difficult to measure short - term frequency stability in time domain. The transformation relation between the two denotations of short-term frequency is used to measure Allan variance indirectly and validated by measured data.
文摘Through analysis we found that some mesoscale anomalous regions (10 1～10 2 km) of meteorological parameters such as the special drought areas, unusual warm areas, the largest snowfall center, low pressure area together with the epicenter area of M S=6.2 Zhangbei earthquake on January 10, 1998 are located at the same area, i.e. there appears the ″Five areas corresponding″ phenomenon. Meanwhile, three times of low pressure evolution are generated and develop in the earthquake area in five days after the occurrence of the earthquake. The abnormal variation of the lower limit of frozen soil layer shows indirectly that unusual warm in earthquake areas are related to the upward thermal conduction from the deeper layer of earth surface.
文摘Exploring the human brain is perhaps the most challenging and fascinating scientific issue in the 21st century.It will facilitate the development of various aspects of the society,including economics,education,health care,national defense and daily life.The artificial intelligence techniques are becoming useful as an alternate method of classical techniques or as a component of an integrated system.They are used to solve complicated problems in various fields and becoming increasingly popular nowadays.Especially,the investigation of human brain will promote the artificial intelligence techniques,utilizing the accumulating knowledge of neuroscience,brain-machine interface techniques,algorithms of spiking neural networks and neuromorphic supercomputers.Consequently,we provide a comprehensive survey of the research and motivations for brain-inspired artificial intelligence and its engineering over its history.The goals of this work are to provide a brief review of the research associated with brain-inspired artificial intelligence and its related engineering techniques,and to motivate further work by elucidating challenges in the field where new researches are required.
文摘A majority of contemporary Chinese historians focus on the so-called Capitalist sprouts to analyze the historical trends and potentials of late imperial China until late twentieth century.Some Western historians,on the other hand,proposed several alternative approaches to overcome the obvious Eurocentric nature of these Capitalist sprouts approaches.Following a brief discussion of the problems with both approaches,this article argues that in terms of social structural and historical trends,late imperial China during the Ming and early Qing period should be taken as an imperial agro-mercantile society with unique structural features and potentials.To present such a hypothesis,this article,first of all,identifies the major novelties as well as irreversible and structural changes in the economic sector during the Ming and early Qing period to confirm that late imperial China was a society with significant development,rather than stagnation.Secondly,it points out that when profound changes were happening,mainly in the economic sector,the imperial rule was enhanced rather than being weakened or disintegrated by these changes in economy.Thirdly,the paper highlights the main features of the agro-mercantile society indicating that this is a changing society profoundly different from the contemporary West in terms of structure and potentials.
文摘The basic concepts about the active structures and some attributes of the modes were presented in paper “Liner Active Structures and Modes]( I) ". The characteristics of the active discrete systems and active beams were discussed, especially, the stability of the active structures and the orthogonality of the eigenvectors. The notes about modes were portrayed by a model of a seven-storeyed building with sensors and actuators. The concept of the adjoint active structure was extended from the discrete systems to the beams that were the representations of the continuous structures. Two types of beams with different placements of the measuring and actuating systems were discussed in detail. One is the beam with the discrete sensors and actuators, and the other is the beam with distributed sensor and actuator function. The orthogonality conditions were derived with the modal shapes of the active beam and its adjoint active beam. An example shows that the variation of eigenvalues with feedback amplitude for the homo-configuration and non-homo-configuration active structures.
