Efcient and accurate monitoring and early warning of coal dynamic disaster and other disasters can provide guarantee for the efcient operation of mine transportation system.However,the traditional threshold early warn...Efcient and accurate monitoring and early warning of coal dynamic disaster and other disasters can provide guarantee for the efcient operation of mine transportation system.However,the traditional threshold early warning method often fails to warning some accidents.To address above issues,a new early warning method was proposed based on"quiet period"phenomenon of AE and EMR during fracture.It is found that,a"quiet period"of AE and EMR was present before the load reaches the peak stress,which could be used as one of the precursors to warn the imminent failure of coal and rock specimens.MS and AE signals increased abnormally followed by the phenomenon of"quiet period"before the occurrence of coal dynamic disaster on site,and the decrease of MS events in the"quiet period"is about 57%–88%compared with that in previous abnormal increase stage.During the damage evolution of coal and rock,"quiet period"phenomenon usually occurred at 85%–90%of the peak stress,where the slope of damage parameter curve is almost zero.The"quiet period"of the AE-EMR signals and the low change rate of damage parameter before failure provide a theoretical foundation for the coal dynamic disaster warning based on the"quiet period"precursor found in MS-AE-EMR monitoring system.These fndings will help reduce the number of under-reported events and improve early warning accuracy.展开更多
The goal of this research is to describe and analyze women’s wear in the late Qing Dynasty andearly Republic Period(late 19th c.—early 20th c.),with an emphasis on the daily informal orsemi-formal wear,though some f...The goal of this research is to describe and analyze women’s wear in the late Qing Dynasty andearly Republic Period(late 19th c.—early 20th c.),with an emphasis on the daily informal orsemi-formal wear,though some formal or ceremonial costumes such as wedding dress will also beincluded.This study will use Chinese costumes and textiles from many museums to fill in theblanks left by previous research and to give a more detailed and accurate description.It will alsouse historical documents to find the original names of these items and to illustrate a general conceptof their usage on different occasions.The different categories of women’s wear will be described in the following order:①robes orcoats;②jackets;③waistcoats or vests;④skirts;⑤pants and leggings;⑥shoes and socks;⑦headdresses;and⑧others.Of every category,the textiles,decoration,cut,form,style,colourand motif will be discussed.The way in which these items were combined will also be discussed.The comparison between women’s wear and men’s wear,women’s and children’s informal andformal dress will be given.Here are some tentative conclusions.First,the Manchu and Han style coexisted and mixedwith each other and were worn by both Manchu and Han women.Second,the basic silhouettesand cuts were relatively stable and conventional,while the decorations and details(openings,fasten-ings,pleats,vents,collars and hemlines)were different.The former represented accepted socialstandards while the latter could be a matter of personal taste.Third,women’s wear in that periodwere highly stylized,miscellaneous,elaborate,detailed,multicolored and multi-thematic.展开更多
The goal of this research is to analyze and discuss the origin of Qipao as women's fashionable wear in the early Republic Period (1911-1949).The origin of Qipao fashion will be discussed in three aspects:1) discus...The goal of this research is to analyze and discuss the origin of Qipao as women's fashionable wear in the early Republic Period (1911-1949).The origin of Qipao fashion will be discussed in three aspects:1) discussion of the original time,place and consumer group of Qipao fashion;2) analysis of initial style and wear combination of Qipao,3) deduction of the origin of the name Qipao.Besides,the analysis will also be given about Qipao's aesthetic characters,its production,consumption guarantee as well as its social backgrounds.The research will be made on the basis of the principles and methods of history,social psychology of clothing and design,and will use many materials especially historical writings and publications to give a more detailed discussion.Here are some tentative conclusions. Firstly, Qipao as a kind of one-piece dress was not inherited directly from the robe of Banner Style. It was a new fashion in the 1920s, which combined the elements of long vest called Qipao Majia, Wenming Xin Zhuang and the Western dress. Secondly, the Shanghai female students were the pioneering group wearing Qipao in 1925. Thirdly, the gradual acceptance of Qipao was mainly due to its aesthetic characters, production, consumption as well as social backgrounds at that time. And it was the kind of daily wear of many Chinese women after 1927. Fourthly, since Qipao represents the special clothing which integrated Chinese traditional style and the Western fashion in the early Republic Period, Qipao is advised to be taken as a special term to take the place of the previous ones like Mandarin Dress, Chipau and Cheongsam and so on.展开更多
In this study,we report an unusual homing behavior of the Sichuan Partridge(Arborophila rufipectus)at the Laojunshan National Nature Reserve,Sichuan Province,China.Hen Sichuan Partridges led the chicks back to the nes...In this study,we report an unusual homing behavior of the Sichuan Partridge(Arborophila rufipectus)at the Laojunshan National Nature Reserve,Sichuan Province,China.Hen Sichuan Partridges led the chicks back to the nests where they hatched in the evening and roosted there over night.This behavior lasted 6.7±4.3 nights(range=1–15;n=13)after the chicks hatched.At this stage,the hens became very vigilant to predators and human disturbance.If disturbed,they often abandoned the nests immediately and no longer returned thereafter.The ambient temperature at night during the early brooding period of Sichuan Partridge at our study site was^12.4°C.Our findings suggest that hen Sichuan Partridges may make trade-offs between nest predation risks versus the thermoregulatory needs of their young.展开更多
Whether children should learn English as early as possible has been a controversial topic, and one of the focal point is the credibility of the critical period hypothesis.Does critical period hypothesis really exist?H...Whether children should learn English as early as possible has been a controversial topic, and one of the focal point is the credibility of the critical period hypothesis.Does critical period hypothesis really exist?How does child's age factor influence English acquisition?Analyzing the problems existing in the early English education based on the critical period hypothesis theory, secondly, investigating child's characteristics and psychological characteristics based on a case study.The research results show that learning English is not the sooner the better; the emphasis is how to ensure the quality.We should Specify children's English education market, and providence environment of language acquisition, attach great importance to the interest, and give full play to children in different stages of learning advantage.Parents and society should correctly treat the early English education, reduce misunderstanding and promote the healthy development of children's English education.展开更多
基金supported by Grants from the National Natural Science Foundation of China(No.52004016)the Postdoctoral Research Foundation of China(No.2021M700371)+3 种基金the Major Science and Technology Innovation Project of Shandong Province(No.2019SDZY02)the Open Fund Project of Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard(No.2021SKMS05)Science and Technology Support Plan Project of Guizhou Province(No.[2021]515)The authors are grateful to the anonymous referees for their precious comments and suggestions.
文摘Efcient and accurate monitoring and early warning of coal dynamic disaster and other disasters can provide guarantee for the efcient operation of mine transportation system.However,the traditional threshold early warning method often fails to warning some accidents.To address above issues,a new early warning method was proposed based on"quiet period"phenomenon of AE and EMR during fracture.It is found that,a"quiet period"of AE and EMR was present before the load reaches the peak stress,which could be used as one of the precursors to warn the imminent failure of coal and rock specimens.MS and AE signals increased abnormally followed by the phenomenon of"quiet period"before the occurrence of coal dynamic disaster on site,and the decrease of MS events in the"quiet period"is about 57%–88%compared with that in previous abnormal increase stage.During the damage evolution of coal and rock,"quiet period"phenomenon usually occurred at 85%–90%of the peak stress,where the slope of damage parameter curve is almost zero.The"quiet period"of the AE-EMR signals and the low change rate of damage parameter before failure provide a theoretical foundation for the coal dynamic disaster warning based on the"quiet period"precursor found in MS-AE-EMR monitoring system.These fndings will help reduce the number of under-reported events and improve early warning accuracy.
文摘The goal of this research is to describe and analyze women’s wear in the late Qing Dynasty andearly Republic Period(late 19th c.—early 20th c.),with an emphasis on the daily informal orsemi-formal wear,though some formal or ceremonial costumes such as wedding dress will also beincluded.This study will use Chinese costumes and textiles from many museums to fill in theblanks left by previous research and to give a more detailed and accurate description.It will alsouse historical documents to find the original names of these items and to illustrate a general conceptof their usage on different occasions.The different categories of women’s wear will be described in the following order:①robes orcoats;②jackets;③waistcoats or vests;④skirts;⑤pants and leggings;⑥shoes and socks;⑦headdresses;and⑧others.Of every category,the textiles,decoration,cut,form,style,colourand motif will be discussed.The way in which these items were combined will also be discussed.The comparison between women’s wear and men’s wear,women’s and children’s informal andformal dress will be given.Here are some tentative conclusions.First,the Manchu and Han style coexisted and mixedwith each other and were worn by both Manchu and Han women.Second,the basic silhouettesand cuts were relatively stable and conventional,while the decorations and details(openings,fasten-ings,pleats,vents,collars and hemlines)were different.The former represented accepted socialstandards while the latter could be a matter of personal taste.Third,women’s wear in that periodwere highly stylized,miscellaneous,elaborate,detailed,multicolored and multi-thematic.
文摘The goal of this research is to analyze and discuss the origin of Qipao as women's fashionable wear in the early Republic Period (1911-1949).The origin of Qipao fashion will be discussed in three aspects:1) discussion of the original time,place and consumer group of Qipao fashion;2) analysis of initial style and wear combination of Qipao,3) deduction of the origin of the name Qipao.Besides,the analysis will also be given about Qipao's aesthetic characters,its production,consumption guarantee as well as its social backgrounds.The research will be made on the basis of the principles and methods of history,social psychology of clothing and design,and will use many materials especially historical writings and publications to give a more detailed discussion.Here are some tentative conclusions. Firstly, Qipao as a kind of one-piece dress was not inherited directly from the robe of Banner Style. It was a new fashion in the 1920s, which combined the elements of long vest called Qipao Majia, Wenming Xin Zhuang and the Western dress. Secondly, the Shanghai female students were the pioneering group wearing Qipao in 1925. Thirdly, the gradual acceptance of Qipao was mainly due to its aesthetic characters, production, consumption as well as social backgrounds at that time. And it was the kind of daily wear of many Chinese women after 1927. Fourthly, since Qipao represents the special clothing which integrated Chinese traditional style and the Western fashion in the early Republic Period, Qipao is advised to be taken as a special term to take the place of the previous ones like Mandarin Dress, Chipau and Cheongsam and so on.
基金This work was supported by the National Natural Science Foundation of China(31872961 and 31272330)the biodiversity survey and assessment project of the Ministry of Ecology and Environment of China(2019HB2096001006)the National Forestry and Grassland Administration of China.
文摘In this study,we report an unusual homing behavior of the Sichuan Partridge(Arborophila rufipectus)at the Laojunshan National Nature Reserve,Sichuan Province,China.Hen Sichuan Partridges led the chicks back to the nests where they hatched in the evening and roosted there over night.This behavior lasted 6.7±4.3 nights(range=1–15;n=13)after the chicks hatched.At this stage,the hens became very vigilant to predators and human disturbance.If disturbed,they often abandoned the nests immediately and no longer returned thereafter.The ambient temperature at night during the early brooding period of Sichuan Partridge at our study site was^12.4°C.Our findings suggest that hen Sichuan Partridges may make trade-offs between nest predation risks versus the thermoregulatory needs of their young.
文摘Whether children should learn English as early as possible has been a controversial topic, and one of the focal point is the credibility of the critical period hypothesis.Does critical period hypothesis really exist?How does child's age factor influence English acquisition?Analyzing the problems existing in the early English education based on the critical period hypothesis theory, secondly, investigating child's characteristics and psychological characteristics based on a case study.The research results show that learning English is not the sooner the better; the emphasis is how to ensure the quality.We should Specify children's English education market, and providence environment of language acquisition, attach great importance to the interest, and give full play to children in different stages of learning advantage.Parents and society should correctly treat the early English education, reduce misunderstanding and promote the healthy development of children's English education.
