Background:Left atrioventricular coupling index(LACI)is a promising marker for predicting major adverse cardiac events in individuals with acute ST-segment elevation myocardial infarction(STEMI).However,the relationsh...Background:Left atrioventricular coupling index(LACI)is a promising marker for predicting major adverse cardiac events in individuals with acute ST-segment elevation myocardial infarction(STEMI).However,the relationship between LACI and adverse left ventricular(LV)remodeling(ALVR)in patients with STEMI remains to be fully elucidated.Methods:In this retrospective study,143 patients with STEMI who had undergone primary percutaneous coronary inter-vention(PCI)underwent cardiovascular magnetic resonance(CMR)imaging.The examinations were performed at 5±2 days(baseline)after PCI and at 6 months after STEMI.Left atrial and LV structural and functional indicators were evaluated.ALVR was defined as an increase of≥20%in LV end-diastolic volume(LVEDV)or an increase of≥15%in LV end-systolic volume at 6 months on CMR images.The patients were divided into two groups depending on the presence or absence of ALVR,and the CMR features were compared between the two groups.Results:Overall,51 patients(mean age 57±11 years;42 men)experienced ALVR after 6 months.In the univariable regression analysis,LVEDV index and LACI were significantly correlated with ALVR(odds ratio[OR]:0.989,95%confidence interval[CI]:0.979-0.999,p=0.025;OR:1.046,95%CI:1.012-1.080,p=0.007,respectively).Following adjustment for fundamental clinical variables,multivariate logistic regression analysis showed that baseline LACI was an independent predictor of ALVR at 6 months(OR:1.324,95%CI:1.055-1.662,p=0.016).Conclusions:CMR-derived LACI in patients with acute STEMI was an independent predictor of ALVR.展开更多
To comprehensively investigate characteristics of summer droughts and floods in the Yangtze River valley, a meteorological and hydrological coupling index （MHCI） was developed using meteorological and hydro- logical...To comprehensively investigate characteristics of summer droughts and floods in the Yangtze River valley, a meteorological and hydrological coupling index （MHCI） was developed using meteorological and hydro- logical data. The results indicate that： （1） in representing drought/flood information for the Yangtze River valley, the MHCI can reflect composite features of precipitation and hydrological observations; （2） compre- hensive analysis of the interannual phase difference of the precipitation and hydrological indices is important to recognize and predict annual drought/flood events along the valley; the hydrological index contributes more strongly to nonlinear and continuity features that indicate transition from long-term drought to flood conditions; （3） time series of the MHCI from 1960-2009 are very effective and sensitive in reflecting annual drought/flood characteristics, i.e. there is more rainfall or typical flooding in the valley when the MHCI is positive, and vice versa; and （4） verification of the MHCI indicates that there is significant correlation between precipitation and hydrologic responses in the valley during summer; the correlation coefficient was found to reach 0.82, exceeding the 0.001 significance level.展开更多
Transit-oriented development(TOD)is increasingly recognized as a key strategy for enhancing transportation efficiency,environmental sustainability,and economic vitality while fostering inclusive communities in dense,m...Transit-oriented development(TOD)is increasingly recognized as a key strategy for enhancing transportation efficiency,environmental sustainability,and economic vitality while fostering inclusive communities in dense,multifunctional urban areas.However,the relationship between TOD’s economic benefits and social equity remains underexplored.This study critically evaluates TOD in Dalian,China,introducing the expanded Node-Place-Economy(NPE)model,which integrates economic and social dimensions into the traditional Node-Place model.The NPE model offers a comprehensive framework for assessing TOD effectiveness,particularly in balancing economic growth and equitable resource distribution.The research highlights significant disparities between central and peripheral regions,with central areas performing better in both economic and social equity,while peripheral areas exacerbate socio-economic inequalities.Through spatial analysis and the Coupling Coordination Index(CCI),the study identifies factors influencing the synergy between economic vitality and social equity,such as the density of commercial,sports,and entertainment facilities.The findings emphasize the need for more equitable TOD planning,suggesting that future urban developments should prioritize social inclusiveness alongside economic efficiency.This research expands the theoretical foundation of TOD and offers practical insights for urban planners aiming to achieve sustainable and inclusive urban development.展开更多
A novel coupled quantum well structure - quasi-symmetric coupled quantum well （QSCQW） is proposed. In the case of low applied electric field （F = 25 kV/cm） and low absorption loss （a ≈ 100 cm^-1）, a large field...A novel coupled quantum well structure - quasi-symmetric coupled quantum well （QSCQW） is proposed. In the case of low applied electric field （F = 25 kV/cm） and low absorption loss （a ≈ 100 cm^-1）, a large field-induced refractive index change （for TE mode, △n = 0.0106; for TM mode, △n = 0.0115） is obtained in QSCQW structure at operating wavelength λ = 1550 nm. The value is larger by over one to two order of magnitude compared to that in a rectangular quantum well （RQW） and about 50% larger than that of five-step asymmetric coupled quantum well （FACQW） structure under the above work conditions.展开更多
基金supported by the National Natural Science Foundation of China(Grant 82471937)Beijing Hospitals Authority Youth Programme(Grant QML20230610).
文摘Background:Left atrioventricular coupling index(LACI)is a promising marker for predicting major adverse cardiac events in individuals with acute ST-segment elevation myocardial infarction(STEMI).However,the relationship between LACI and adverse left ventricular(LV)remodeling(ALVR)in patients with STEMI remains to be fully elucidated.Methods:In this retrospective study,143 patients with STEMI who had undergone primary percutaneous coronary inter-vention(PCI)underwent cardiovascular magnetic resonance(CMR)imaging.The examinations were performed at 5±2 days(baseline)after PCI and at 6 months after STEMI.Left atrial and LV structural and functional indicators were evaluated.ALVR was defined as an increase of≥20%in LV end-diastolic volume(LVEDV)or an increase of≥15%in LV end-systolic volume at 6 months on CMR images.The patients were divided into two groups depending on the presence or absence of ALVR,and the CMR features were compared between the two groups.Results:Overall,51 patients(mean age 57±11 years;42 men)experienced ALVR after 6 months.In the univariable regression analysis,LVEDV index and LACI were significantly correlated with ALVR(odds ratio[OR]:0.989,95%confidence interval[CI]:0.979-0.999,p=0.025;OR:1.046,95%CI:1.012-1.080,p=0.007,respectively).Following adjustment for fundamental clinical variables,multivariate logistic regression analysis showed that baseline LACI was an independent predictor of ALVR at 6 months(OR:1.324,95%CI:1.055-1.662,p=0.016).Conclusions:CMR-derived LACI in patients with acute STEMI was an independent predictor of ALVR.
基金supported by project GYHY201106050the National"973"Program of China under Grant No.2011CB403404,and Project No.2009Y002
文摘To comprehensively investigate characteristics of summer droughts and floods in the Yangtze River valley, a meteorological and hydrological coupling index （MHCI） was developed using meteorological and hydro- logical data. The results indicate that： （1） in representing drought/flood information for the Yangtze River valley, the MHCI can reflect composite features of precipitation and hydrological observations; （2） compre- hensive analysis of the interannual phase difference of the precipitation and hydrological indices is important to recognize and predict annual drought/flood events along the valley; the hydrological index contributes more strongly to nonlinear and continuity features that indicate transition from long-term drought to flood conditions; （3） time series of the MHCI from 1960-2009 are very effective and sensitive in reflecting annual drought/flood characteristics, i.e. there is more rainfall or typical flooding in the valley when the MHCI is positive, and vice versa; and （4） verification of the MHCI indicates that there is significant correlation between precipitation and hydrologic responses in the valley during summer; the correlation coefficient was found to reach 0.82, exceeding the 0.001 significance level.
基金supported by the National Natural Science Foundation of China(Grant No.52308011).
文摘Transit-oriented development(TOD)is increasingly recognized as a key strategy for enhancing transportation efficiency,environmental sustainability,and economic vitality while fostering inclusive communities in dense,multifunctional urban areas.However,the relationship between TOD’s economic benefits and social equity remains underexplored.This study critically evaluates TOD in Dalian,China,introducing the expanded Node-Place-Economy(NPE)model,which integrates economic and social dimensions into the traditional Node-Place model.The NPE model offers a comprehensive framework for assessing TOD effectiveness,particularly in balancing economic growth and equitable resource distribution.The research highlights significant disparities between central and peripheral regions,with central areas performing better in both economic and social equity,while peripheral areas exacerbate socio-economic inequalities.Through spatial analysis and the Coupling Coordination Index(CCI),the study identifies factors influencing the synergy between economic vitality and social equity,such as the density of commercial,sports,and entertainment facilities.The findings emphasize the need for more equitable TOD planning,suggesting that future urban developments should prioritize social inclusiveness alongside economic efficiency.This research expands the theoretical foundation of TOD and offers practical insights for urban planners aiming to achieve sustainable and inclusive urban development.
基金This work was supported by the National NaturalScience Foundation of China under Grant No. 60277034,60436020.
文摘A novel coupled quantum well structure - quasi-symmetric coupled quantum well （QSCQW） is proposed. In the case of low applied electric field （F = 25 kV/cm） and low absorption loss （a ≈ 100 cm^-1）, a large field-induced refractive index change （for TE mode, △n = 0.0106; for TM mode, △n = 0.0115） is obtained in QSCQW structure at operating wavelength λ = 1550 nm. The value is larger by over one to two order of magnitude compared to that in a rectangular quantum well （RQW） and about 50% larger than that of five-step asymmetric coupled quantum well （FACQW） structure under the above work conditions.
