Grazing is a main human activity in the grasslands of Xinjiang, China. It is vital to identify the effects of grazing on the sustainable utilization of local grasslands. However, the effects of grazing on net primary ...Grazing is a main human activity in the grasslands of Xinjiang, China. It is vital to identify the effects of grazing on the sustainable utilization of local grasslands. However, the effects of grazing on net primary productivity （NPP）, evapotranspiration （ET） and water use efficiency （WUE） in this region remain unclear. Using the spatial Biome-BGC grazing model, we explored the effects of grazing on NPP, ET and WUE across the different regions and grassland types in Xinjiang during 1979-2012. NPP, ET and WUE under the grazed scenario were generally lower than those under the ungrazed scenario, and the differences showed increasing trends over time. The decreases in NPP, ET and WUE varied significantly among the regions and grassland types. NPP decreased as follows： among the regions, Northern Xinjiang （16.60 g C/（m2·a））, Tianshan Mountains （15.94 g C/（m2·a）） and Southern Xinjiang （-3.54 g C/（m2·a））; and among the grassland types, typical grasslands （25.70 g C/（m2·a））, swamp meadows （25.26 g C/（m2·a））, mid-mountain meadows （23.39 g C/（m2·a））, alpine meadows （6.33 g C/（m2·a））, desert grasslands （5.82 g C/（m2·a）） and saline meadows （2.90 g C/（me.a））. ET decreased as follows： among the regions, Tianshan Mountains （28.95 mm/a）, Northern Xinjiang （8.11 mm/a） and Southern Xinjiang （7.57 mm/a）; and among the grassland types, mid-mountain meadows （29.30 mm/a）, swamp meadows （25.07 mm·a）, typical grasslands （24.56 mm/a）, alpine meadows （20.69 mm/a）, desert grasslands （11.06 mm/a） and saline meadows （3.44 mm/a）. WUE decreased as follows： among the regions, Northern Xinjiang （0.053 g C/kg H2O）, Tianshan Mountains （0.034 g C/kg H2O） and Southern Xinjiang （0.012 g C/kg H2O）; and among the grassland types, typical grasslands （0.0609 g C/kg H2O）, swamp meadows （0.0548 g C/kg H2O）, mid-mountain meadows （0.0501 g C/kg H2O）, desert grasslands （0.0172 g C/kg H2O）, alpine meadows （0.0121 g C/kg H2O） and saline meadows （0.0067 g C/kg H2O）. In general, the decreases in NPP and WUE were more significant in the regions with relatively high levels of vegetation growth because of the high grazing intensity in these regions. The decreases in ET were significant in mountainous areas due to the terrain and high grazing intensity.展开更多
Background: Compulsive behavior, dyskinesias, motor fluctuations, and hallucinations are common Parkinson’s disease (PD) medication side effects. These are yet to be examined in relation to race and level of educatio...Background: Compulsive behavior, dyskinesias, motor fluctuations, and hallucinations are common Parkinson’s disease (PD) medication side effects. These are yet to be examined in relation to race and level of education. The goal of this analysis was to identify socioeconomic or clinical variables that are associated with compulsive behavior, dyskinesias, motor fluctuations, and hallucinations in patients in a safety-net hospital. Methods: A movement disorder patient database containing 452 patients with idiopathic PD was analyzed for differences in PD medication side effects using univariate and multivariate logistic regression analysis. Race, sex, and level of education were evaluated as possible confounders. Results: A greater proportion of the patients in this study were Caucasian males. The only variable associated with compulsive behavior was age, with higher age having a protective effect (p = 0.0336). Disease duration (defined as time since the onset of symptoms), diagnosis duration (time since formal diagnosis), and level of education were significantly associated with dyskinesia inunivariate analysis (p =< 0.0001, <0.0001, 0.1236 respectively). However, diagnosis duration was the only variable significantly associated with dyskinesia in multivariate analysis (p = 0.0038), in addition to a borderline significant association when comparing individuals with graduate degree to those who had completed high school education or less (p = 0.0599), with a protective effect of higher education. Disease duration, diagnosis duration, and use of monoamineoxidase inhibitors were also significantly associated with motor fluctuations in the univariate analysis, while only diagnosis duration was significantly associated with motor fluctuations in multivariate analysis (p = 0.0035) with longer diagnosis duration associated with higher risk of motor fluctuations. Age, disease duration, and diagnosis duration were associated with an increased risk of hallucinations in univariate analysis (p =< 0.0001, <0.0001, <0.0001 respectively), but age and disease duration were the only variables associated with hallucinations in multivariate analysis (p = 0.0009, 0.1196 respectively). Race was not associated with a higher risk of compulsive behavior, dyskinesias, motor fluctuations, or hallucinations. Conclusion: Compulsive behavior, dyskinesias, motor fluctuations, and hallucinations in our PD population may be associated with differences in socioeconomic status and access to care, but not with differences in race.展开更多
Oil is extremely crucial to the development of the modern economy. It is important to forecast the oil supply capacity due to its scarcity and non-renewability. This paper attempts to forecast and analyze thirty-five ...Oil is extremely crucial to the development of the modern economy. It is important to forecast the oil supply capacity due to its scarcity and non-renewability. This paper attempts to forecast and analyze thirty-five current and potential net oil-exporting countries. Integrating both qualitative and quantitative methods, the oil production and consumption are predicted based on historical data, so that the world net oil-exporting capacity can be obtained. The results show that the ＂roof effect＂ of the world net oil-exporting capacity may appear before 2030. Unconventional oil will play an important role in the future world oil market. The competition and cooperation relationships between OPEC and non-OPEC will last for a long time.展开更多
基金supported by the National Key Research and Development Program of China[grant number 2022YFE0106500]the Youth Innovation Promotion Association of the Chinese Academy of Sciences[grant number 2022076]the National Key Scientific and Technological Infrastructure project“Earth System Numerical Simulation Facility”(EarthLab)[grant number 2023-EL-ZD-00012].
基金supported financially by the National Natural Science Foundation of China(41361140361,41271126)the Project of State Key Laboratory of Desert and Oasis Ecology(Y471163)
文摘Grazing is a main human activity in the grasslands of Xinjiang, China. It is vital to identify the effects of grazing on the sustainable utilization of local grasslands. However, the effects of grazing on net primary productivity （NPP）, evapotranspiration （ET） and water use efficiency （WUE） in this region remain unclear. Using the spatial Biome-BGC grazing model, we explored the effects of grazing on NPP, ET and WUE across the different regions and grassland types in Xinjiang during 1979-2012. NPP, ET and WUE under the grazed scenario were generally lower than those under the ungrazed scenario, and the differences showed increasing trends over time. The decreases in NPP, ET and WUE varied significantly among the regions and grassland types. NPP decreased as follows： among the regions, Northern Xinjiang （16.60 g C/（m2·a））, Tianshan Mountains （15.94 g C/（m2·a）） and Southern Xinjiang （-3.54 g C/（m2·a））; and among the grassland types, typical grasslands （25.70 g C/（m2·a））, swamp meadows （25.26 g C/（m2·a））, mid-mountain meadows （23.39 g C/（m2·a））, alpine meadows （6.33 g C/（m2·a））, desert grasslands （5.82 g C/（m2·a）） and saline meadows （2.90 g C/（me.a））. ET decreased as follows： among the regions, Tianshan Mountains （28.95 mm/a）, Northern Xinjiang （8.11 mm/a） and Southern Xinjiang （7.57 mm/a）; and among the grassland types, mid-mountain meadows （29.30 mm/a）, swamp meadows （25.07 mm·a）, typical grasslands （24.56 mm/a）, alpine meadows （20.69 mm/a）, desert grasslands （11.06 mm/a） and saline meadows （3.44 mm/a）. WUE decreased as follows： among the regions, Northern Xinjiang （0.053 g C/kg H2O）, Tianshan Mountains （0.034 g C/kg H2O） and Southern Xinjiang （0.012 g C/kg H2O）; and among the grassland types, typical grasslands （0.0609 g C/kg H2O）, swamp meadows （0.0548 g C/kg H2O）, mid-mountain meadows （0.0501 g C/kg H2O）, desert grasslands （0.0172 g C/kg H2O）, alpine meadows （0.0121 g C/kg H2O） and saline meadows （0.0067 g C/kg H2O）. In general, the decreases in NPP and WUE were more significant in the regions with relatively high levels of vegetation growth because of the high grazing intensity in these regions. The decreases in ET were significant in mountainous areas due to the terrain and high grazing intensity.
文摘Background: Compulsive behavior, dyskinesias, motor fluctuations, and hallucinations are common Parkinson’s disease (PD) medication side effects. These are yet to be examined in relation to race and level of education. The goal of this analysis was to identify socioeconomic or clinical variables that are associated with compulsive behavior, dyskinesias, motor fluctuations, and hallucinations in patients in a safety-net hospital. Methods: A movement disorder patient database containing 452 patients with idiopathic PD was analyzed for differences in PD medication side effects using univariate and multivariate logistic regression analysis. Race, sex, and level of education were evaluated as possible confounders. Results: A greater proportion of the patients in this study were Caucasian males. The only variable associated with compulsive behavior was age, with higher age having a protective effect (p = 0.0336). Disease duration (defined as time since the onset of symptoms), diagnosis duration (time since formal diagnosis), and level of education were significantly associated with dyskinesia inunivariate analysis (p =< 0.0001, <0.0001, 0.1236 respectively). However, diagnosis duration was the only variable significantly associated with dyskinesia in multivariate analysis (p = 0.0038), in addition to a borderline significant association when comparing individuals with graduate degree to those who had completed high school education or less (p = 0.0599), with a protective effect of higher education. Disease duration, diagnosis duration, and use of monoamineoxidase inhibitors were also significantly associated with motor fluctuations in the univariate analysis, while only diagnosis duration was significantly associated with motor fluctuations in multivariate analysis (p = 0.0035) with longer diagnosis duration associated with higher risk of motor fluctuations. Age, disease duration, and diagnosis duration were associated with an increased risk of hallucinations in univariate analysis (p =< 0.0001, <0.0001, <0.0001 respectively), but age and disease duration were the only variables associated with hallucinations in multivariate analysis (p = 0.0009, 0.1196 respectively). Race was not associated with a higher risk of compulsive behavior, dyskinesias, motor fluctuations, or hallucinations. Conclusion: Compulsive behavior, dyskinesias, motor fluctuations, and hallucinations in our PD population may be associated with differences in socioeconomic status and access to care, but not with differences in race.
基金support from Key Projects of Philosophy and Social Sciences Research of Ministry of Education(09JZD0038)
文摘Oil is extremely crucial to the development of the modern economy. It is important to forecast the oil supply capacity due to its scarcity and non-renewability. This paper attempts to forecast and analyze thirty-five current and potential net oil-exporting countries. Integrating both qualitative and quantitative methods, the oil production and consumption are predicted based on historical data, so that the world net oil-exporting capacity can be obtained. The results show that the ＂roof effect＂ of the world net oil-exporting capacity may appear before 2030. Unconventional oil will play an important role in the future world oil market. The competition and cooperation relationships between OPEC and non-OPEC will last for a long time.
