Glaciers were solid reservoirs and important water resources in western China,but they were retreating significantly in context of global warming.Laohugou Glacier No.12 was the largest valley glacier in Qilian Mountai...Glaciers were solid reservoirs and important water resources in western China,but they were retreating significantly in context of global warming.Laohugou Glacier No.12 was the largest valley glacier in Qilian Mountains.In this study,realtime kinematic(RTK)data,topographic map and World View-2 satellite imagery were used to measure changes in terminus,extent and volume of Laohugou Glacier No.12.Results showed that Laohugou Glacier No.12 was shrinking significantly since 1957.From1960 to 2015,the terminus reduction of Laohugou Glacier No.12 was 402.96 m(3.99%)in total,and glacier length decreased to 9.7 km from 10.1 km.Reduction of glacier area and volume were the most obvious.From 1957 to 2015,glacier area and volume decreased by 1.54 km^2(7.03%)and 0.1816 km^3,respectively.Reduction trend of terminus and area was slowing in 1950-1980s,even stable for a period in the mid-1980s,and then accelerated.Ice core analysis result and nearly meteorological station data shown an increasing trend of temperature in 1957-2015,it was a main reason of continuous retreating of Laohugou Glacier No.12.展开更多
The net accumulation record of ice core is one of the most reliable indicators for reconstructing precipitation changes in high mountains. A 20.12 m ice core was drilled in 2006 from the accumulation zone of Laohugou ...The net accumulation record of ice core is one of the most reliable indicators for reconstructing precipitation changes in high mountains. A 20.12 m ice core was drilled in 2006 from the accumulation zone of Laohugou Glacier No.12 in the northeastern Tibetan Plateau, China. We obtained the precipitation from the ice core net accumulation during 1960-2006, and found out the relationship between Laohugou ice core record and other data from surrounding sites of the northeastern Tibetan Plateau. Results showed that during 1960-2006, the precipitation in the high mountains showed firstly an increasing trend, while during 1980 to 2006 it showed an obvious decreasing trend. Reconstructed precipitation change in the Laohugou glacier basin was consistent with the measured data from the nearby weather stations in the lower mountain of Subei, and the correlation coefficient was 0.619 （P〈0.001）. However, the precipitation in the high mountain was about 3 times more than that of the lower mountain. The precipitation in Laohugou Glacier No.12 of the western Qilian Mountains corresponded well to the net accumulation of Dunde ice core during the same period, tree-ring reconstructed precipitation, the measured data of multiple meteorological stations in the northeastern Tibetan Plateau, and also the changes of adjacent PDSI drought index. Precipitation changes of the Laohugou glacier basin and other sites of the northeastern Tibetan Plateau had significantly positive correlation with ENSO, which implied that the regional alpine precipitation change was very likely to be influenced by ENSO.展开更多
This study reconstructed the annual mass balance(MB)of Laohugou Glacier No.12 in the western Qilian Mountains during 1961–2015.The annual MB was calculated based on a temperature-index and an accumulation model with ...This study reconstructed the annual mass balance(MB)of Laohugou Glacier No.12 in the western Qilian Mountains during 1961–2015.The annual MB was calculated based on a temperature-index and an accumulation model with inputs of daily air temperature and precipitation recorded by surrounding meteorological stations.The model was calibrated by in-situ MB measurements conducted on the glacier during 2010–2015.Change in constructed annual MB had three phases.During Phase Ⅰ(1961-1984),glacier-wide MB values were slightly positive with an average MB of 24±276 mm w.e.(water equivalent).During Phase Ⅱ(1984-1995),the MB values became slightly negative with an average MB of?50±276 mm w.e..The most negative MB values were found during Phase Ⅲ(1996–2015),with an average MB of?377±276 mm w.e.Climatic analysis showed that the warming led to accelerated glacier mass loss despite a persistent increase of precipitation during the analysis period.However,an increase of black carbon deposited on the glacier surface since the 1980s could have contributed to intensified glacier melt.From simulations and measurements of MB on the Urumqi Glacier No.1,26%of glacier melt caused by black carbon could be identified.展开更多
Objective:The current standard D2 lymphadenectomy for gastric cancer(GC)includes dissection of lymph nodes(LNs)along the proper hepatic artery(No.12 a),however,the survival benefit remains controversial.The purpose of...Objective:The current standard D2 lymphadenectomy for gastric cancer(GC)includes dissection of lymph nodes(LNs)along the proper hepatic artery(No.12 a),however,the survival benefit remains controversial.The purpose of this study was to evaluate the pattern of No.12 a LN metastasis(LNM)in GC and explore the indications for No.12 a LN dissection.Methods:Medical records of 413 consecutive GC patients who underwent curative surgery in Zhongshan Hospital,Fudan University between January 2015 and December 2018 were enrolled and reviewed retrospectively.The correlation between No.12 a LNM and clinicopathologic characteristics of patients was analyzed.Results:The overall incidence of No.12 a LNM was 2.67%(11/413).Tumor location(P=0.012),depth of tumor infiltration(P<0.01)and N stage(P=0.018)were significant factors associated with No.12 a LNM.All the tumors with No.12 a LNM involved the lower third of the stomach and were in T3-4 stages.Patients with No.12 a LNM had extensive LNM than those without(20.91±4.25 vs.5.0±0.54,P<0.001).For advanced GC patients(stage III/IV)with tumors involving the lower third of the stomach,the incidence of No.12 a LNM increased to 10.7%(11/103).Patients with No.12 a LNM had a significantly poorer recurrence-free survival(RFS)(P=0.005)and overall survival(OS)(P=0.017).According to the result of multivariable Cox regression,No.12 a LNM was not an independent impact factor on RFS and OS.Conclusions:The overall incidence of No.12 a LNM was low but it was much higher in GC patients who had very advanced tumors involving the lower third of the stomach.No.12 a LN dissection should be considered for these patients to improve the survival outcomes.展开更多
BACKGROUND Controversy over the issue that No.12a lymph node involvement is distant or regional metastasis remains,and the possible inclusion of 12a lymph nodes in D2 lymphadenectomy is unclear.As reported,gastric can...BACKGROUND Controversy over the issue that No.12a lymph node involvement is distant or regional metastasis remains,and the possible inclusion of 12a lymph nodes in D2 lymphadenectomy is unclear.As reported,gastric cancer(GC)located in the lower third is highly related to the metastasis of station 12a lymph nodes.AIM To investigate whether the clinicopathological factors and metastasis status of other perigastric nodes can predict station 12a lymph node metastasis and evaluate the prognostic significance of station 12a lymph node dissection in patients with lower-third GC.METHODS A total of 147 patients with lower-third GC who underwent D2 or D2+lymphadenectomy,including station 12a lymph node dissection,were included in this retrospective study from June 2003 to March 2011.Survival prognoses were compared between patients with or without station 12a lymph node metastasis.Logistic regression analyses were used to clarify the association between station 12a lymph node metastasis and clinicopathological factors or metastasis status of other perigastric nodes.The metastasis status of each regional lymph node was evaluated to identify the possible predictors of station 12a lymph node metastasis.RESULTS Metastasis to station 12a lymph nodes was observed in 18 patients with lowerthird GC,but not in 129 patients.The incidence of station 12a lymph node involvement was reported as 12.2%in patients with lower-third GC.The overall survival of patients without station 12a lymph node metastasis was significantly better than that of patients with station 12a metastasis(P<0.001),which could also be seen in patients with or without extranodal soft tissue invasion.Station 12a lymph node metastasis and extranodal soft tissue invasion were identified as independent predictors of poor prognosis in patients with lower-third GC.Advanced pN stage was defined as independent risk factor significantly correlated with station 12a lymph node positivity.Station 3 lymph node staus was also proven to be significantly correlated with station 12a展开更多
In June 2006,a 20.12 m shallow ice core was recovered from an elevation of 5,040 m in the northern branch firn basin of No.12 Glacier,Great Snow Mountain,in the western part of Qilian Mountain,China.Isotopes(δ 18 O),...In June 2006,a 20.12 m shallow ice core was recovered from an elevation of 5,040 m in the northern branch firn basin of No.12 Glacier,Great Snow Mountain,in the western part of Qilian Mountain,China.Isotopes(δ 18 O),major soluble ions,and radionuclide(β-activity) measurements from the ice core revealed a 46-year record(1960-2006).In this paper,the method of sea-salt ion tracer,correlation analysis and trend analysis were used in this research to confirm the source of the chemical composition.The correlation analysis and HYSPLIT backward trajectory analysis suggests that atmospheric soluble dust species dominate the chemical signature.展开更多
[Objective] The research aimed to understand the high-yielding technique in intersubspecific hybrid rice Yongyou No.12. [Method] The correlation analysis, regression analysis and path analysis of intersubspecific hybr...[Objective] The research aimed to understand the high-yielding technique in intersubspecific hybrid rice Yongyou No.12. [Method] The correlation analysis, regression analysis and path analysis of intersubspecific hybrid rice Yongyou No. 12 were conducted based on the data of its ear, grain and weight with yield higher than 10 500 kg/hm^2. [Result] The enhancement of effective ears would restrain the number of per ear total grains. It was found that the direct contributions of main economic traits to yield were determined to be effective ear〉total grains per ear〉 seed setting rate〉l 000-grain weight. [Conclusion] The high-yielding cultivation techniques were suggested as follows： besides necessary ear number, grain number per ear should be focused with a consideration to 1 000-grain weight.展开更多
Solid precipitation is not only the main supply for glacier mass,but also exerts an important influence on surface albedo and intensifies glacier melting.However,precipitation type observation is very scarce in the hi...Solid precipitation is not only the main supply for glacier mass,but also exerts an important influence on surface albedo and intensifies glacier melting.However,precipitation type observation is very scarce in the high alpine glaciers,which limits the precise simulation of glacier mass balance.This study assessed three discrimination methods of precipitation types including Ding method,Dai method and Froidurot method based on surface albedo observation data on the Laohugou Glacier No.12(LHG Glacier)in western Qilian Mountains.The results showed that Ding method had a best applicability on the LHG Glacier,the other two need to calibrate parameters when they are used in the high elevation glacier region.Then we fitted the relationship between snowfall probability and fresh snow albedo,and put forward a revised formula to simulate fresh snow albedo based on Ding method,which is expected to reduce the uncertainty in glacier mass and energy balance model.Finally,we found a best air temperature threshold of 4℃for discriminating monthly precipitation types.In order to accurately simulate the glacier melt,it is necessary to obtain the threshold temperature appropriately in different glacier region with different elevation and humidity.展开更多
With global warming,glaciers in the high mountains of China are retreating rapidly.However,few data have been reported on whether greenhouse gases from these glaciers are released into the atmosphere or absorbed by gl...With global warming,glaciers in the high mountains of China are retreating rapidly.However,few data have been reported on whether greenhouse gases from these glaciers are released into the atmosphere or absorbed by glacial meltwater.In this study,we collected meltwater and ice samples from Laohugou Glacier No.12 in western China and measured CH_(4)and CO_(2)concentrations.Meltwater from the glacier terminus was continually sampled between 3 and 5 August 2020 to measure CH_(4)and CO_(2)concentrations.The results demonstrated that meltwater is a source of CH_(4)because the average saturations are over 100%.It could be con eluded that CH_(4)in the atmosphere can be released by glacial meltwater.However,the CO_(2)saturations are various,and CO_(2)fluxes exhibit positive(released CO_(2))or negative(absorbed CO_(2))values because the water and atmospheric conditions are variable.More importantly,the CH_(4)and CO_(2)concentrations were higher in meltwater samples from the glacier terminus than in samples from the surface ice(including an ice core)and a surface stream.Although the meltwater effect from the upper part of the glacier cannot be excluded,we speculated that subglacial drainage systems with an anaerobic environment may represent the CH_(4)source,but it needs to be further investigated in the future.However,high mountain glaciers are currently ignored in global carbon budgets,and the increased melting of glaciers with global warming may accelerate the absorption of much more CO_(2)and lead to the release of CH_(4).展开更多
The mung bean variety Ji Heilv No.12 was bred by Institute of Characteristic Crop Research, Chongqing Academy of Agricultural Sciences and Institute of Food and Oil Crops, Hebei Academy of Agricultural and Forestry Sc...The mung bean variety Ji Heilv No.12 was bred by Institute of Characteristic Crop Research, Chongqing Academy of Agricultural Sciences and Institute of Food and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences. using Jilv 9and Jilv 7 as female and male parent respectively,with pedigree method. Ji Heilv No.12 is a new variety with features of high and stable yield,broad adaptability and strong resistance in yield trails during 2011-2012; it was approved and released by Chongqing Provincial Committee of Crop Variety Identification in 2012,suitable for cultivating in most area of Chongqing.展开更多
Effect of row space and planting density on yield of Miandan No.12 was studied. The test included four row spaces and two planting densities. Specifically, four row spaces were 50, 67, 83 and 100 cm and two planting d...Effect of row space and planting density on yield of Miandan No.12 was studied. The test included four row spaces and two planting densities. Specifically, four row spaces were 50, 67, 83 and 100 cm and two planting densities were 42 000 and 48 000 plant/hm2. The results showed that Miandan No.12 reached the highest yield when row space was 50 cm and planting density was 48 000 plantJhm2 and Miandan No.12 got the lowest yield when row space was 100 cm and planting density was 42 000 plants/hm2.展开更多
Regularity of the Inverse of a Homeomorphism with Finite Inner Distortion Chang Yu GUO Abstract Let f:Ω→f（Ω）R<sup>n</sup> be a W<sup>1,1</sup>-homeomorphism with L<sup>1</sup>...Regularity of the Inverse of a Homeomorphism with Finite Inner Distortion Chang Yu GUO Abstract Let f:Ω→f（Ω）R<sup>n</sup> be a W<sup>1,1</sup>-homeomorphism with L<sup>1</sup>-integrable inner distortion.We show that finiteness of min{lip<sub>f</sub>（x）,k<sub>f</sub>（x）},for every x∈Ω\E,implies that f<sup>-1</sup>∈W<sup>1,n</sup>and has finite distortion,provided that the exceptional set E hasσ-finite H<sup>1</sup>-measure.Moreover,f has finite distortion,differentiable a.e.and the Jacobian J<sub>f</sub>】0 a.e.展开更多
Distances between Elements of a Semigroup and Estimates for Derivatives Zohra BENDOUAD Isabelle CHALENDAR Jean ESTERLE Jonathan R.PARTINGTON Abstract This paper is concerned first with the behaviour of differences T(t...Distances between Elements of a Semigroup and Estimates for Derivatives Zohra BENDOUAD Isabelle CHALENDAR Jean ESTERLE Jonathan R.PARTINGTON Abstract This paper is concerned first with the behaviour of differences T(t) - T(s) near the origin,where(T(t)) is a semigroup of operators on a Banach space,defined either on the positive real line or a sector in the right half-plane(in which case it is assumed analytic).For the non-quasinilpotent case extensions of results in the published literature are provided,with best possible constants;in the case of quasinilpotent semigroups on the half-plane,it is展开更多
基金supported by the National Foundational Scientific and Technological Work Programs of the Ministry of Science and Technology of China (grant No. 2013FY111400)the Project from the State Key Laboratory of Cryospheric Sciences (grant No. SKLCS-ZZ-2017)the National Key Geographic Conditions Monitoring: The Project of Basic National Geographical Conditions Monitoring in 2015
文摘Glaciers were solid reservoirs and important water resources in western China,but they were retreating significantly in context of global warming.Laohugou Glacier No.12 was the largest valley glacier in Qilian Mountains.In this study,realtime kinematic(RTK)data,topographic map and World View-2 satellite imagery were used to measure changes in terminus,extent and volume of Laohugou Glacier No.12.Results showed that Laohugou Glacier No.12 was shrinking significantly since 1957.From1960 to 2015,the terminus reduction of Laohugou Glacier No.12 was 402.96 m(3.99%)in total,and glacier length decreased to 9.7 km from 10.1 km.Reduction of glacier area and volume were the most obvious.From 1957 to 2015,glacier area and volume decreased by 1.54 km^2(7.03%)and 0.1816 km^3,respectively.Reduction trend of terminus and area was slowing in 1950-1980s,even stable for a period in the mid-1980s,and then accelerated.Ice core analysis result and nearly meteorological station data shown an increasing trend of temperature in 1957-2015,it was a main reason of continuous retreating of Laohugou Glacier No.12.
基金National Natural Science Foundation of China, No.41371091 No.41201067+1 种基金 No.41301064 National Basic Research Program of China, No.2013CBA01801
文摘The net accumulation record of ice core is one of the most reliable indicators for reconstructing precipitation changes in high mountains. A 20.12 m ice core was drilled in 2006 from the accumulation zone of Laohugou Glacier No.12 in the northeastern Tibetan Plateau, China. We obtained the precipitation from the ice core net accumulation during 1960-2006, and found out the relationship between Laohugou ice core record and other data from surrounding sites of the northeastern Tibetan Plateau. Results showed that during 1960-2006, the precipitation in the high mountains showed firstly an increasing trend, while during 1980 to 2006 it showed an obvious decreasing trend. Reconstructed precipitation change in the Laohugou glacier basin was consistent with the measured data from the nearby weather stations in the lower mountain of Subei, and the correlation coefficient was 0.619 （P〈0.001）. However, the precipitation in the high mountain was about 3 times more than that of the lower mountain. The precipitation in Laohugou Glacier No.12 of the western Qilian Mountains corresponded well to the net accumulation of Dunde ice core during the same period, tree-ring reconstructed precipitation, the measured data of multiple meteorological stations in the northeastern Tibetan Plateau, and also the changes of adjacent PDSI drought index. Precipitation changes of the Laohugou glacier basin and other sites of the northeastern Tibetan Plateau had significantly positive correlation with ENSO, which implied that the regional alpine precipitation change was very likely to be influenced by ENSO.
基金The work were supported by the Chinese Academy of Sciences(No.QYZDJ-SSW-DQC039)the National Natural Science Foundation of China(Nos.41630754,41721091)+2 种基金the Science and Technology planning Project of Gansu Province(No.18JR4RA002)the Project of the State Key Laboratory of Cryospheric Sciences(Nos.SKLCS-OP-2018-06,SKLCS-OP-2019-01)Open Foundation of State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering(No.2017490711).
文摘This study reconstructed the annual mass balance(MB)of Laohugou Glacier No.12 in the western Qilian Mountains during 1961–2015.The annual MB was calculated based on a temperature-index and an accumulation model with inputs of daily air temperature and precipitation recorded by surrounding meteorological stations.The model was calibrated by in-situ MB measurements conducted on the glacier during 2010–2015.Change in constructed annual MB had three phases.During Phase Ⅰ(1961-1984),glacier-wide MB values were slightly positive with an average MB of 24±276 mm w.e.(water equivalent).During Phase Ⅱ(1984-1995),the MB values became slightly negative with an average MB of?50±276 mm w.e..The most negative MB values were found during Phase Ⅲ(1996–2015),with an average MB of?377±276 mm w.e.Climatic analysis showed that the warming led to accelerated glacier mass loss despite a persistent increase of precipitation during the analysis period.However,an increase of black carbon deposited on the glacier surface since the 1980s could have contributed to intensified glacier melt.From simulations and measurements of MB on the Urumqi Glacier No.1,26%of glacier melt caused by black carbon could be identified.
基金supported by National Natural Science Fund(No.31842033)。
文摘Objective:The current standard D2 lymphadenectomy for gastric cancer(GC)includes dissection of lymph nodes(LNs)along the proper hepatic artery(No.12 a),however,the survival benefit remains controversial.The purpose of this study was to evaluate the pattern of No.12 a LN metastasis(LNM)in GC and explore the indications for No.12 a LN dissection.Methods:Medical records of 413 consecutive GC patients who underwent curative surgery in Zhongshan Hospital,Fudan University between January 2015 and December 2018 were enrolled and reviewed retrospectively.The correlation between No.12 a LNM and clinicopathologic characteristics of patients was analyzed.Results:The overall incidence of No.12 a LNM was 2.67%(11/413).Tumor location(P=0.012),depth of tumor infiltration(P<0.01)and N stage(P=0.018)were significant factors associated with No.12 a LNM.All the tumors with No.12 a LNM involved the lower third of the stomach and were in T3-4 stages.Patients with No.12 a LNM had extensive LNM than those without(20.91±4.25 vs.5.0±0.54,P<0.001).For advanced GC patients(stage III/IV)with tumors involving the lower third of the stomach,the incidence of No.12 a LNM increased to 10.7%(11/103).Patients with No.12 a LNM had a significantly poorer recurrence-free survival(RFS)(P=0.005)and overall survival(OS)(P=0.017).According to the result of multivariable Cox regression,No.12 a LNM was not an independent impact factor on RFS and OS.Conclusions:The overall incidence of No.12 a LNM was low but it was much higher in GC patients who had very advanced tumors involving the lower third of the stomach.No.12 a LN dissection should be considered for these patients to improve the survival outcomes.
文摘BACKGROUND Controversy over the issue that No.12a lymph node involvement is distant or regional metastasis remains,and the possible inclusion of 12a lymph nodes in D2 lymphadenectomy is unclear.As reported,gastric cancer(GC)located in the lower third is highly related to the metastasis of station 12a lymph nodes.AIM To investigate whether the clinicopathological factors and metastasis status of other perigastric nodes can predict station 12a lymph node metastasis and evaluate the prognostic significance of station 12a lymph node dissection in patients with lower-third GC.METHODS A total of 147 patients with lower-third GC who underwent D2 or D2+lymphadenectomy,including station 12a lymph node dissection,were included in this retrospective study from June 2003 to March 2011.Survival prognoses were compared between patients with or without station 12a lymph node metastasis.Logistic regression analyses were used to clarify the association between station 12a lymph node metastasis and clinicopathological factors or metastasis status of other perigastric nodes.The metastasis status of each regional lymph node was evaluated to identify the possible predictors of station 12a lymph node metastasis.RESULTS Metastasis to station 12a lymph nodes was observed in 18 patients with lowerthird GC,but not in 129 patients.The incidence of station 12a lymph node involvement was reported as 12.2%in patients with lower-third GC.The overall survival of patients without station 12a lymph node metastasis was significantly better than that of patients with station 12a metastasis(P<0.001),which could also be seen in patients with or without extranodal soft tissue invasion.Station 12a lymph node metastasis and extranodal soft tissue invasion were identified as independent predictors of poor prognosis in patients with lower-third GC.Advanced pN stage was defined as independent risk factor significantly correlated with station 12a lymph node positivity.Station 3 lymph node staus was also proven to be significantly correlated with station 12a
基金supported by the National Basic Research Program of China (2007CB411501)the National Essential Scientific Program of the Ministry of Scienceand Technology of the People’s Republic of China(2006FY110200)
文摘In June 2006,a 20.12 m shallow ice core was recovered from an elevation of 5,040 m in the northern branch firn basin of No.12 Glacier,Great Snow Mountain,in the western part of Qilian Mountain,China.Isotopes(δ 18 O),major soluble ions,and radionuclide(β-activity) measurements from the ice core revealed a 46-year record(1960-2006).In this paper,the method of sea-salt ion tracer,correlation analysis and trend analysis were used in this research to confirm the source of the chemical composition.The correlation analysis and HYSPLIT backward trajectory analysis suggests that atmospheric soluble dust species dominate the chemical signature.
基金Suppored by the Science and Technology Plan of Taizhou City(121KY15)~~
文摘[Objective] The research aimed to understand the high-yielding technique in intersubspecific hybrid rice Yongyou No.12. [Method] The correlation analysis, regression analysis and path analysis of intersubspecific hybrid rice Yongyou No. 12 were conducted based on the data of its ear, grain and weight with yield higher than 10 500 kg/hm^2. [Result] The enhancement of effective ears would restrain the number of per ear total grains. It was found that the direct contributions of main economic traits to yield were determined to be effective ear〉total grains per ear〉 seed setting rate〉l 000-grain weight. [Conclusion] The high-yielding cultivation techniques were suggested as follows： besides necessary ear number, grain number per ear should be focused with a consideration to 1 000-grain weight.
基金supported by the National key research and development project(2022YFF0711704)the Science Fund for Creative Research Groups of Gansu Province(Grant No.23JRRA567)+2 种基金China Meteorological Administration Climate Change Special Program(CMA-CCSP:QBZ202308)Innovation and Development Project of China Meteorological Administration(CXFZ2022J039)the Gansu Provincial Science and Technology Program(22ZD6FA005)。
文摘Solid precipitation is not only the main supply for glacier mass,but also exerts an important influence on surface albedo and intensifies glacier melting.However,precipitation type observation is very scarce in the high alpine glaciers,which limits the precise simulation of glacier mass balance.This study assessed three discrimination methods of precipitation types including Ding method,Dai method and Froidurot method based on surface albedo observation data on the Laohugou Glacier No.12(LHG Glacier)in western Qilian Mountains.The results showed that Ding method had a best applicability on the LHG Glacier,the other two need to calibrate parameters when they are used in the high elevation glacier region.Then we fitted the relationship between snowfall probability and fresh snow albedo,and put forward a revised formula to simulate fresh snow albedo based on Ding method,which is expected to reduce the uncertainty in glacier mass and energy balance model.Finally,we found a best air temperature threshold of 4℃for discriminating monthly precipitation types.In order to accurately simulate the glacier melt,it is necessary to obtain the threshold temperature appropriately in different glacier region with different elevation and humidity.
基金This research has been supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XAD19070103)the National Key Research and Development Program of China(2020YFA0608501)+2 种基金the State Key Laboratory of Cryospheric Science(SKLCS-ZZ-2021)the Youth Innovation Promotion Association,CAS(2020419)the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0605).
文摘With global warming,glaciers in the high mountains of China are retreating rapidly.However,few data have been reported on whether greenhouse gases from these glaciers are released into the atmosphere or absorbed by glacial meltwater.In this study,we collected meltwater and ice samples from Laohugou Glacier No.12 in western China and measured CH_(4)and CO_(2)concentrations.Meltwater from the glacier terminus was continually sampled between 3 and 5 August 2020 to measure CH_(4)and CO_(2)concentrations.The results demonstrated that meltwater is a source of CH_(4)because the average saturations are over 100%.It could be con eluded that CH_(4)in the atmosphere can be released by glacial meltwater.However,the CO_(2)saturations are various,and CO_(2)fluxes exhibit positive(released CO_(2))or negative(absorbed CO_(2))values because the water and atmospheric conditions are variable.More importantly,the CH_(4)and CO_(2)concentrations were higher in meltwater samples from the glacier terminus than in samples from the surface ice(including an ice core)and a surface stream.Although the meltwater effect from the upper part of the glacier cannot be excluded,we speculated that subglacial drainage systems with an anaerobic environment may represent the CH_(4)source,but it needs to be further investigated in the future.However,high mountain glaciers are currently ignored in global carbon budgets,and the increased melting of glaciers with global warming may accelerate the absorption of much more CO_(2)and lead to the release of CH_(4).
基金Supported by Chongqing Science&Technology Commission(cstc2016shmszx80116csct2012jj A80042+5 种基金cstc2013yykfc800022015cstc-jbky-005072015cstc-jbky-00508)National Modern Agricultural Industry Technology System(CARS-09)Chongqing Finance Program(NKY-2016AB009NKY-2016AA002)
文摘The mung bean variety Ji Heilv No.12 was bred by Institute of Characteristic Crop Research, Chongqing Academy of Agricultural Sciences and Institute of Food and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences. using Jilv 9and Jilv 7 as female and male parent respectively,with pedigree method. Ji Heilv No.12 is a new variety with features of high and stable yield,broad adaptability and strong resistance in yield trails during 2011-2012; it was approved and released by Chongqing Provincial Committee of Crop Variety Identification in 2012,suitable for cultivating in most area of Chongqing.
基金Supported by National Food High-yield Science and Technology Project(2012BAD04B13-3)~~
文摘Effect of row space and planting density on yield of Miandan No.12 was studied. The test included four row spaces and two planting densities. Specifically, four row spaces were 50, 67, 83 and 100 cm and two planting densities were 42 000 and 48 000 plant/hm2. The results showed that Miandan No.12 reached the highest yield when row space was 50 cm and planting density was 48 000 plantJhm2 and Miandan No.12 got the lowest yield when row space was 100 cm and planting density was 42 000 plants/hm2.
文摘Regularity of the Inverse of a Homeomorphism with Finite Inner Distortion Chang Yu GUO Abstract Let f:Ω→f（Ω）R<sup>n</sup> be a W<sup>1,1</sup>-homeomorphism with L<sup>1</sup>-integrable inner distortion.We show that finiteness of min{lip<sub>f</sub>（x）,k<sub>f</sub>（x）},for every x∈Ω\E,implies that f<sup>-1</sup>∈W<sup>1,n</sup>and has finite distortion,provided that the exceptional set E hasσ-finite H<sup>1</sup>-measure.Moreover,f has finite distortion,differentiable a.e.and the Jacobian J<sub>f</sub>】0 a.e.
文摘Distances between Elements of a Semigroup and Estimates for Derivatives Zohra BENDOUAD Isabelle CHALENDAR Jean ESTERLE Jonathan R.PARTINGTON Abstract This paper is concerned first with the behaviour of differences T(t) - T(s) near the origin,where(T(t)) is a semigroup of operators on a Banach space,defined either on the positive real line or a sector in the right half-plane(in which case it is assumed analytic).For the non-quasinilpotent case extensions of results in the published literature are provided,with best possible constants;in the case of quasinilpotent semigroups on the half-plane,it is
