位于鄂尔多斯西北缘的、狼山和河套盆地之间的狼山山前断裂是1条全新世活动断裂。沿狼山山前断裂,从北向南开挖了3个古地震探槽,分别为东升村探槽(TC1)、青山镇探槽(TC2)和乌兰哈少探槽(TC3)。由TC1限定的3次古地震事件(ED1、ED2、ED3)...位于鄂尔多斯西北缘的、狼山和河套盆地之间的狼山山前断裂是1条全新世活动断裂。沿狼山山前断裂,从北向南开挖了3个古地震探槽,分别为东升村探槽(TC1)、青山镇探槽(TC2)和乌兰哈少探槽(TC3)。由TC1限定的3次古地震事件(ED1、ED2、ED3)的发震时间可相应地限定为(6±1. 3) ka BP、(9. 6±2) ka BP和(19. 7±4. 2) ka BP;由TC2揭露的古地震事件EQ1的发震时间可以限定为(6. 7±0. 1) ka BP;由TC3限定的3次古地震事件(EW1、EW2、EW3)的发震时间可相应地限定为(2. 3±0. 4) ka BP、(6±1) ka BP和7ka之前。结合前人的研究,可以确定狼山山前断裂晚更新世以来的古地震序列为2.3～2.43ka BP(E1)、 4.41～3.06ka BP(E2)、 6.71～6.8ka BP(E3)、 7.6～9.81ka BP(E4)和(19.7±4.2) ka BP(E5)。虽然由于事件E5可能包含了多次古地震事件,导致晚更新世以来古地震漏记的可能性仍然无法剔除,但仍可认为狼山山前断裂在全新世期间的古地震历史应该是完整的,强震平均复发周期约为2 500a。与古地震事件E1、E3和E4相关的地震同震位移值明显较其他事件更大,表明这3次古地震事件可能是震级为7. 5～8级甚至>8级的破裂断裂全段的古地震事件,而古地震事件E2可能是较小一点的、仅破裂部分断裂段的古地震事件。狼山山前断裂在乌兰哈少点自15ka BP以来的滑动速率应该大于但接近于0. 66mm/a。狼山山前断裂的古地震研究结果显示,断裂现今是1条倾向于在地表破裂事件中全段破裂的不分段断裂。假设约2 500a的强震复发周期成立,则自最近1次强震事件以来的离逝时间接近或者已经超过了强震复发周期,狼山地区再发生强震事件的危险性是非常大的。展开更多
A first-principles study has been performed to calculate the electronic and optical properties of the SbxSn1xO system.The simulations are based upon the method of generalized gradient approximations with the Perdew-Bu...A first-principles study has been performed to calculate the electronic and optical properties of the SbxSn1xO system.The simulations are based upon the method of generalized gradient approximations with the Perdew-Burke-Ernzerhof form in the framework of density functional theory.The supercell structure shows a trend from expanding to shrinking with the increasing Sb concentration.The increasing Sb concentration induces the band gap narrowing.Optical transition has shifted to the low energy range with increasing Sb concentration.Other important optical constants such as the dielectric function,reflectivity,refractive index,and electron energy loss function for Sb-doped SnO2 are discussed.The optical absorption edge of SnO2 doped with Sb also shows a redshift.展开更多
The general analytic expression of the chirped sampled function is derived based on coupled mode theory. This function can be used to describe how to use uniform period fiber Bragg grating to produce the equal chirp a...The general analytic expression of the chirped sampled function is derived based on coupled mode theory. This function can be used to describe how to use uniform period fiber Bragg grating to produce the equal chirp at will in the specific reflection channel. As an example,the exact sampled function expression that produces a linear chirped at the +4 channel is given. The simulation results by using the transfer-matrix show that the theory is correct.展开更多
We investigate the propagation properties of a multi-layer photonic crystal fiber with novel rhombic air holes using the finite element method,and calculate the dependence of the propagation properties on the waveleng...We investigate the propagation properties of a multi-layer photonic crystal fiber with novel rhombic air holes using the finite element method,and calculate the dependence of the propagation properties on the wavelength in the fiber with different geometrical structural parameters,including the internal angle and the external arrangement of the rhombic air holes.Optimizing these parameters,we design a photonic crystal which exhibits both a small dispersion value and low loss near the wavelength of 1.55μm.展开更多
SPSS13.0 was used to process the data of the 1-6 batch of key cultural relic conservation units promulgated by the State Administration of Cultural Heritage of China;and multi-element evaluation method was used to cal...SPSS13.0 was used to process the data of the 1-6 batch of key cultural relic conservation units promulgated by the State Administration of Cultural Heritage of China;and multi-element evaluation method was used to calculate the composite distribution index.The spatial distribution of cultural relics of provinces in China can be divided into four grades,namely:very rich areas,rich areas,poor areas and very poor areas;the article analyzes the characteristics of cultural resources in spatial and temporal distribution.The paper holds that(1)the distribution of China's cultural relic tourism resources is relatively concentrated,different sharply from region to region,with more Han nation's heritage,less relics of the ethnic minorities;(2) Henan,Hebei,Shaanxi,Shanxi Province are the main regions with heavy distribution of cultural resources;(3) relics appeared in specific time periods in China's history.Ming and Qing Dynasties,Sui,Tang and Five Dynasties,Song,Liao and Jin,the Western Han,Shang and Zhou dynasties,the New Stone Age are the major periods producing more cultural relics.This paper also analyzes relationships of the emergence of cultural relics with production technology,specific historical process,specific geographical location,political system,religion,national culture,customs,architectural styles and techniques of the traditional cultural educational system.Finally,the paper discusses the development and protection of heritage.展开更多
Boundary faults of the Daxing Uplift and Langgu-Dachang Depression are located in the southeastern region of the Beijing Plain and directly control the sedimentation,tectonic evolution,and strong seismic activity of t...Boundary faults of the Daxing Uplift and Langgu-Dachang Depression are located in the southeastern region of the Beijing Plain and directly control the sedimentation,tectonic evolution,and strong seismic activity of the plain.The Sanhe-Pinggu earthquake of Ms 8.0 occurred in 1679,but the active tectonic deformation characteristics of the boundary have been rarely discussed.In this study,the active tectonic deformation characteristics of the Daxing Uplift and Langgu-Dachang Depression boundary rupture were investigated by collecting and analyzing the results of previous works,supplementing three shallow-seismicexploration control lines at locations where the data are lacking,and carrying out borehole combined profi le exploration and optically stimulated luminescence dating at local breakpoints.Results show that the Daxing Uplift and Langgu-Dachang Depression boundary faults constitute an active tectonic deformation zone with~50 km distance between Mafang and Niubaotun towns and then extends to both ends to form a deep and large fault that cuts through the earth’s crust.The activity of the Daxing Uplift eastern boundary fault may be divided into two sections near Anding town,with the early-to-middle Late Pleistocene gradually weakening in the northwest and the Holocene gradually weakening in the southwest.Moreover,the activity of the Xiadian fault may be divided into two sections near the Chaobai River:the Holocene gradually weakening in the northwest and the early-to-middle Late Pleistocene gradually weakening in the southwest.The boundary fault of the Daxing Uplift and Langgu-Dachang Depression has an~43 km seismic gap around Niubaotun town,which has a high risk of Ms 6.0-7.0 earthquakes.This investigation into the active tectonic deformation characteristics of the boundary fault of the Daxing Uplift and Langgu-Dachang Depression is crucial for analyzing the strong earthquake rupture behavior and the future risk of strong earthquakes in this area.It also contributes greatly to the study of the tectonic pattern evolution of the North China Plain and Beijing Plain.展开更多
Oenethera biennis oil was administered (6 g per day) in 23 chronic renal insufficiency pa-tients over a 4 week period. Changes of serum creatinine, creatinine clearance, plasma lipid, renin activity,and angiatensin ...Oenethera biennis oil was administered (6 g per day) in 23 chronic renal insufficiency pa-tients over a 4 week period. Changes of serum creatinine, creatinine clearance, plasma lipid, renin activity,and angiatensin , urinary thromboxane B2 and 6-keto-prostaglandin F1 were observed before and after thetreatment. Results showed that after treatment. the creatinine clearance increased, serum total cholesterol,triglyceride and low density lipoprotein decreased, high density lipoprotein increased, plasma renin activity,angiotensin and urinary thromboxane B2 decreased significantly. The conclusion was that Oenethera bien-nis oil could improve the pathological process of renal diseases, and has benoficial effects on plasma lipiddisorder and glomerular hemodynamics .展开更多
Using a full-vector finite-difference time-domain （FDTD） method, this article explores the propagation characteristics of photonic crystal fiber （PCF） theoretically. The dependence of structural parameters on the ...Using a full-vector finite-difference time-domain （FDTD） method, this article explores the propagation characteristics of photonic crystal fiber （PCF） theoretically. The dependence of structural parameters on the effective index of the fundamental guided mode, effective index of the fundamental cladding mode, mode field diameter, confinement loss, effective mode area, and chromatic dispersion in PCF have been studied, respectively. The research presents a reference for designing of PCF with a specific purpose.展开更多
文摘位于鄂尔多斯西北缘的、狼山和河套盆地之间的狼山山前断裂是1条全新世活动断裂。沿狼山山前断裂,从北向南开挖了3个古地震探槽,分别为东升村探槽(TC1)、青山镇探槽(TC2)和乌兰哈少探槽(TC3)。由TC1限定的3次古地震事件(ED1、ED2、ED3)的发震时间可相应地限定为(6±1. 3) ka BP、(9. 6±2) ka BP和(19. 7±4. 2) ka BP;由TC2揭露的古地震事件EQ1的发震时间可以限定为(6. 7±0. 1) ka BP;由TC3限定的3次古地震事件(EW1、EW2、EW3)的发震时间可相应地限定为(2. 3±0. 4) ka BP、(6±1) ka BP和7ka之前。结合前人的研究,可以确定狼山山前断裂晚更新世以来的古地震序列为2.3～2.43ka BP(E1)、 4.41～3.06ka BP(E2)、 6.71～6.8ka BP(E3)、 7.6～9.81ka BP(E4)和(19.7±4.2) ka BP(E5)。虽然由于事件E5可能包含了多次古地震事件,导致晚更新世以来古地震漏记的可能性仍然无法剔除,但仍可认为狼山山前断裂在全新世期间的古地震历史应该是完整的,强震平均复发周期约为2 500a。与古地震事件E1、E3和E4相关的地震同震位移值明显较其他事件更大,表明这3次古地震事件可能是震级为7. 5～8级甚至>8级的破裂断裂全段的古地震事件,而古地震事件E2可能是较小一点的、仅破裂部分断裂段的古地震事件。狼山山前断裂在乌兰哈少点自15ka BP以来的滑动速率应该大于但接近于0. 66mm/a。狼山山前断裂的古地震研究结果显示,断裂现今是1条倾向于在地表破裂事件中全段破裂的不分段断裂。假设约2 500a的强震复发周期成立,则自最近1次强震事件以来的离逝时间接近或者已经超过了强震复发周期,狼山地区再发生强震事件的危险性是非常大的。
基金Supported by the Fundamental Research Funds for the Central Universities under Grant No. BUPT2009RC0412the National Natural Science Foundation of China under Grant Nos. 60908028 and 60971068
文摘A first-principles study has been performed to calculate the electronic and optical properties of the SbxSn1xO system.The simulations are based upon the method of generalized gradient approximations with the Perdew-Burke-Ernzerhof form in the framework of density functional theory.The supercell structure shows a trend from expanding to shrinking with the increasing Sb concentration.The increasing Sb concentration induces the band gap narrowing.Optical transition has shifted to the low energy range with increasing Sb concentration.Other important optical constants such as the dielectric function,reflectivity,refractive index,and electron energy loss function for Sb-doped SnO2 are discussed.The optical absorption edge of SnO2 doped with Sb also shows a redshift.
基金Supported National "863" High Technology Project of China(No.2003AA311070) andthe National Natural Science Founda-tion of China (No.60377026 ) .
文摘The general analytic expression of the chirped sampled function is derived based on coupled mode theory. This function can be used to describe how to use uniform period fiber Bragg grating to produce the equal chirp at will in the specific reflection channel. As an example,the exact sampled function expression that produces a linear chirped at the +4 channel is given. The simulation results by using the transfer-matrix show that the theory is correct.
基金by the National High-Technology Research and Development Program of China under Grant No 2009AA03Z405the National Natural Science Foundation of China under Grant Nos 60971068 and 60908028.
文摘We investigate the propagation properties of a multi-layer photonic crystal fiber with novel rhombic air holes using the finite element method,and calculate the dependence of the propagation properties on the wavelength in the fiber with different geometrical structural parameters,including the internal angle and the external arrangement of the rhombic air holes.Optimizing these parameters,we design a photonic crystal which exhibits both a small dispersion value and low loss near the wavelength of 1.55μm.
基金supported by Science Research Program of Hainan Provincial Education Bureau (Grant No Hj2008-79)funded by the National Natural Science Foundation of China (Grant Nos 40963001, 40061003, 40661013)Key Course Program of Natural Geography of Hainan Normal University and First-degree Course Program of Geographical Science of Hainan Province
文摘SPSS13.0 was used to process the data of the 1-6 batch of key cultural relic conservation units promulgated by the State Administration of Cultural Heritage of China;and multi-element evaluation method was used to calculate the composite distribution index.The spatial distribution of cultural relics of provinces in China can be divided into four grades,namely:very rich areas,rich areas,poor areas and very poor areas;the article analyzes the characteristics of cultural resources in spatial and temporal distribution.The paper holds that(1)the distribution of China's cultural relic tourism resources is relatively concentrated,different sharply from region to region,with more Han nation's heritage,less relics of the ethnic minorities;(2) Henan,Hebei,Shaanxi,Shanxi Province are the main regions with heavy distribution of cultural resources;(3) relics appeared in specific time periods in China's history.Ming and Qing Dynasties,Sui,Tang and Five Dynasties,Song,Liao and Jin,the Western Han,Shang and Zhou dynasties,the New Stone Age are the major periods producing more cultural relics.This paper also analyzes relationships of the emergence of cultural relics with production technology,specific historical process,specific geographical location,political system,religion,national culture,customs,architectural styles and techniques of the traditional cultural educational system.Finally,the paper discusses the development and protection of heritage.
文摘Boundary faults of the Daxing Uplift and Langgu-Dachang Depression are located in the southeastern region of the Beijing Plain and directly control the sedimentation,tectonic evolution,and strong seismic activity of the plain.The Sanhe-Pinggu earthquake of Ms 8.0 occurred in 1679,but the active tectonic deformation characteristics of the boundary have been rarely discussed.In this study,the active tectonic deformation characteristics of the Daxing Uplift and Langgu-Dachang Depression boundary rupture were investigated by collecting and analyzing the results of previous works,supplementing three shallow-seismicexploration control lines at locations where the data are lacking,and carrying out borehole combined profi le exploration and optically stimulated luminescence dating at local breakpoints.Results show that the Daxing Uplift and Langgu-Dachang Depression boundary faults constitute an active tectonic deformation zone with~50 km distance between Mafang and Niubaotun towns and then extends to both ends to form a deep and large fault that cuts through the earth’s crust.The activity of the Daxing Uplift eastern boundary fault may be divided into two sections near Anding town,with the early-to-middle Late Pleistocene gradually weakening in the northwest and the Holocene gradually weakening in the southwest.Moreover,the activity of the Xiadian fault may be divided into two sections near the Chaobai River:the Holocene gradually weakening in the northwest and the early-to-middle Late Pleistocene gradually weakening in the southwest.The boundary fault of the Daxing Uplift and Langgu-Dachang Depression has an~43 km seismic gap around Niubaotun town,which has a high risk of Ms 6.0-7.0 earthquakes.This investigation into the active tectonic deformation characteristics of the boundary fault of the Daxing Uplift and Langgu-Dachang Depression is crucial for analyzing the strong earthquake rupture behavior and the future risk of strong earthquakes in this area.It also contributes greatly to the study of the tectonic pattern evolution of the North China Plain and Beijing Plain.
文摘Oenethera biennis oil was administered (6 g per day) in 23 chronic renal insufficiency pa-tients over a 4 week period. Changes of serum creatinine, creatinine clearance, plasma lipid, renin activity,and angiatensin , urinary thromboxane B2 and 6-keto-prostaglandin F1 were observed before and after thetreatment. Results showed that after treatment. the creatinine clearance increased, serum total cholesterol,triglyceride and low density lipoprotein decreased, high density lipoprotein increased, plasma renin activity,angiotensin and urinary thromboxane B2 decreased significantly. The conclusion was that Oenethera bien-nis oil could improve the pathological process of renal diseases, and has benoficial effects on plasma lipiddisorder and glomerular hemodynamics .
基金supported by the National Natural Science Foundation of China(60644004)the National Basic Research Program of China(2003CB314901)
文摘Using a full-vector finite-difference time-domain （FDTD） method, this article explores the propagation characteristics of photonic crystal fiber （PCF） theoretically. The dependence of structural parameters on the effective index of the fundamental guided mode, effective index of the fundamental cladding mode, mode field diameter, confinement loss, effective mode area, and chromatic dispersion in PCF have been studied, respectively. The research presents a reference for designing of PCF with a specific purpose.
