Eclogite pebbles are first discovered in late Jurassic conglomerates of the Fenghuangtai Formation from the northern foot of the Dabie Mountains, eastern China. The eclogite shows relatively strong retrograde metamor-...Eclogite pebbles are first discovered in late Jurassic conglomerates of the Fenghuangtai Formation from the northern foot of the Dabie Mountains, eastern China. The eclogite shows relatively strong retrograde metamor-phism. The major remnant minerals are garnet, phengite, quartz, rutile, clinozoisite, fingerprint(or worm)-form sym-plectite and pseudomorphic enclosure of coesite in garnet. End-member components of the garnet mainly made up of grossular (27.7%-37.8%), almandinc (45.5%-49.0%) and pyrope (12.3%-25.7%). End-member components of the pyrope is less than 30%, i.e. equivalent to C type eclogite. Si-cations of the phengite are 3.44-3.54 p.f.u. (taking O=11as standard). It is estimated that the pressures are 2.5-3.2 GPa, the temperatures are 600-900℃. Discovery of the eclogite pebbles in the late Jurassic conglomerates from the northern foot of the Dabie Mountains suggests that the HP-UHP metamorphic rocks of the Dabie Mountains, which were formed in Triassic, had been exposed to the surface in展开更多
Compared with the remains discovered from Jianxin-a Neolithic site in south Shandong province, this paper divided the Dawenkou culture of north Anhui and east Henan provinces into three phases, corresponding with the ...Compared with the remains discovered from Jianxin-a Neolithic site in south Shandong province, this paper divided the Dawenkou culture of north Anhui and east Henan provinces into three phases, corresponding with the early, middle and the late period of the Jianxin site respectively. The time span was believed from 3300 to 2600 B. C.. It belonged to the Dawenkou culture system, but had its own cultural characteris- tics and tradition and developed from its own area rather than migrated from Shandong province. According to historical documents, the founder of the Dawenkou culture of north Anhui and east Henan must have been the tribe of Taihao (太昊)展开更多
目的分析血培养阳性报警时间(time to positive,TTP)对新生儿败血症的临床意义。方法选取2016年8月至2019年6月深圳市宝安区妇幼保健院新生儿科收治的血培养阳性患儿进行回顾性研究,分析患儿临床资料,根据病原菌、早发/晚发型败血症、污...目的分析血培养阳性报警时间(time to positive,TTP)对新生儿败血症的临床意义。方法选取2016年8月至2019年6月深圳市宝安区妇幼保健院新生儿科收治的血培养阳性患儿进行回顾性研究,分析患儿临床资料,根据病原菌、早发/晚发型败血症、污染/非污染进行分组,比较不同组别的TTP,分析TTP的临床意义。结果共10035例进行血培养,阳性307例,排除污染菌162例,确诊败血症145例(1.4%)。145例败血症血培养TTP中,<24 h 131例(90.3%),24~<48 h 11例(7.6%),48~<72 h 2例(1.4%),≥72 h 1例(0.7%)。其中早发型败血症TTP中位数为9.0 h,晚发型败血症TTP中位数为11.5 h。污染菌TTP[24.5(19.9,30.5)h]长于非污染菌TTP[11.1(8.1,16.2)h];革兰阳性菌TTP[14.0(9.4,18.8)h]长于革兰阴性菌TTP[9.6(7.5,11.3)h];真菌TTP[32.5(25.5,39.0)h]较细菌TTP[10.6(8.1,15.5)h]长,差异均有统计学意义(P<0.05)。结论不同病原菌的TTP不同,对于怀疑败血症的新生儿,若血培养72 h仍未报阳,结合临床表现及血液非特异性检查,可考虑停用经验性抗生素。展开更多
The late-time tail of massive Dirac fields in Kerr spacetime is investigated by using the black hole Green function. It is shown that in the intermediate late times there are two kinds of new properties. The one is th...The late-time tail of massive Dirac fields in Kerr spacetime is investigated by using the black hole Green function. It is shown that in the intermediate late times there are two kinds of new properties. The one is that the asymptotic behaviour of the massive Dirac fields is dominated by a decaying tail without any oscillation, which is different from the oscillatory decaying tails of the massive scalar field; the other is that the dumping exponent for the massive Dirac field depends not only on the multiple number of the wave mode and the mass of the Dirac particle but also on the rotating parameter of the black hole.展开更多
A simple Ultra-WideBand(UWB)exponentially-tapered Transverse ElectroMagnetic(TEM)horn antenna is presented for the asphalt detection based on Ground Penetrating Radar(GPR).In order to reduce the reflections from the a...A simple Ultra-WideBand(UWB)exponentially-tapered Transverse ElectroMagnetic(TEM)horn antenna is presented for the asphalt detection based on Ground Penetrating Radar(GPR).In order to reduce the reflections from the antenna aperture,some absorbing material is loaded on the outer surface of the conductor.Comparing with the traditional TEM horn antenna,the proposed antenna has a small size and a large impedance bandwidth.Simulated and measured results show that the proposed TEM horn antenna has a low Voltage Standing Wave Ratio(VSWR)below 2 over the whole band from 0.35 GHz to 12 GHz,good radiation characteristics,and small late-time ringing,which can perfectly meet the requirements of the GPR application.展开更多
By computing and classifying the data of gully offset obtained from field surveys along the Tianjingshan fault zone and estimating the ages of three types of gullies,the strike-slip rates along the fault zone are disc...By computing and classifying the data of gully offset obtained from field surveys along the Tianjingshan fault zone and estimating the ages of three types of gullies,the strike-slip rates along the fault zone are discussed in different time intervals and fault segments.The results suggest that the intensity of activity along the fault zone is not strong,but the differences between different time intervals and fault segments since the late Pleistocene have been obvious.The average rates range from 0.23 mm/a to 1.62 mm/a.The largest average rate is 1.40 mm/a,which occurred in the early and middle of late Pleistocene along the western segment of the fault zone.Since the late stage of the late Pleistocene,the center of faulting activity of the fault zone has shifted to the middle segment,and the average slip rates range have changed from 1.30 mm/a to 1.63 mm/a.展开更多
基金This work was supported by a project (Grant No. KZ951-A1-401-07) of the Chinese Academy of Sciences.
文摘Eclogite pebbles are first discovered in late Jurassic conglomerates of the Fenghuangtai Formation from the northern foot of the Dabie Mountains, eastern China. The eclogite shows relatively strong retrograde metamor-phism. The major remnant minerals are garnet, phengite, quartz, rutile, clinozoisite, fingerprint(or worm)-form sym-plectite and pseudomorphic enclosure of coesite in garnet. End-member components of the garnet mainly made up of grossular (27.7%-37.8%), almandinc (45.5%-49.0%) and pyrope (12.3%-25.7%). End-member components of the pyrope is less than 30%, i.e. equivalent to C type eclogite. Si-cations of the phengite are 3.44-3.54 p.f.u. (taking O=11as standard). It is estimated that the pressures are 2.5-3.2 GPa, the temperatures are 600-900℃. Discovery of the eclogite pebbles in the late Jurassic conglomerates from the northern foot of the Dabie Mountains suggests that the HP-UHP metamorphic rocks of the Dabie Mountains, which were formed in Triassic, had been exposed to the surface in
文摘Compared with the remains discovered from Jianxin-a Neolithic site in south Shandong province, this paper divided the Dawenkou culture of north Anhui and east Henan provinces into three phases, corresponding with the early, middle and the late period of the Jianxin site respectively. The time span was believed from 3300 to 2600 B. C.. It belonged to the Dawenkou culture system, but had its own cultural characteris- tics and tradition and developed from its own area rather than migrated from Shandong province. According to historical documents, the founder of the Dawenkou culture of north Anhui and east Henan must have been the tribe of Taihao (太昊)
文摘目的分析血培养阳性报警时间(time to positive,TTP)对新生儿败血症的临床意义。方法选取2016年8月至2019年6月深圳市宝安区妇幼保健院新生儿科收治的血培养阳性患儿进行回顾性研究,分析患儿临床资料,根据病原菌、早发/晚发型败血症、污染/非污染进行分组,比较不同组别的TTP,分析TTP的临床意义。结果共10035例进行血培养,阳性307例,排除污染菌162例,确诊败血症145例(1.4%)。145例败血症血培养TTP中,<24 h 131例(90.3%),24~<48 h 11例(7.6%),48~<72 h 2例(1.4%),≥72 h 1例(0.7%)。其中早发型败血症TTP中位数为9.0 h,晚发型败血症TTP中位数为11.5 h。污染菌TTP[24.5(19.9,30.5)h]长于非污染菌TTP[11.1(8.1,16.2)h];革兰阳性菌TTP[14.0(9.4,18.8)h]长于革兰阴性菌TTP[9.6(7.5,11.3)h];真菌TTP[32.5(25.5,39.0)h]较细菌TTP[10.6(8.1,15.5)h]长,差异均有统计学意义(P<0.05)。结论不同病原菌的TTP不同,对于怀疑败血症的新生儿,若血培养72 h仍未报阳,结合临床表现及血液非特异性检查,可考虑停用经验性抗生素。
基金Project supported by the National Natural Science Foundation of China （Grant No 10473004）, the FANEDD （Grant No 200317）, the SRFDP （Grant No 20040542003）, the Hunan Provincial Natural Science Foundation of China （Grant No 05JJ0001）.
文摘The late-time tail of massive Dirac fields in Kerr spacetime is investigated by using the black hole Green function. It is shown that in the intermediate late times there are two kinds of new properties. The one is that the asymptotic behaviour of the massive Dirac fields is dominated by a decaying tail without any oscillation, which is different from the oscillatory decaying tails of the massive scalar field; the other is that the dumping exponent for the massive Dirac field depends not only on the multiple number of the wave mode and the mass of the Dirac particle but also on the rotating parameter of the black hole.
基金Supported by the National High Technology Research and Development Program(No.2012AA121901)
文摘A simple Ultra-WideBand(UWB)exponentially-tapered Transverse ElectroMagnetic(TEM)horn antenna is presented for the asphalt detection based on Ground Penetrating Radar(GPR).In order to reduce the reflections from the antenna aperture,some absorbing material is loaded on the outer surface of the conductor.Comparing with the traditional TEM horn antenna,the proposed antenna has a small size and a large impedance bandwidth.Simulated and measured results show that the proposed TEM horn antenna has a low Voltage Standing Wave Ratio(VSWR)below 2 over the whole band from 0.35 GHz to 12 GHz,good radiation characteristics,and small late-time ringing,which can perfectly meet the requirements of the GPR application.
基金This project was sponsored by the State Seismological Bureau (85-02-3-3), China
文摘By computing and classifying the data of gully offset obtained from field surveys along the Tianjingshan fault zone and estimating the ages of three types of gullies,the strike-slip rates along the fault zone are discussed in different time intervals and fault segments.The results suggest that the intensity of activity along the fault zone is not strong,but the differences between different time intervals and fault segments since the late Pleistocene have been obvious.The average rates range from 0.23 mm/a to 1.62 mm/a.The largest average rate is 1.40 mm/a,which occurred in the early and middle of late Pleistocene along the western segment of the fault zone.Since the late stage of the late Pleistocene,the center of faulting activity of the fault zone has shifted to the middle segment,and the average slip rates range have changed from 1.30 mm/a to 1.63 mm/a.
