Prof. Yang Fujia, a nuclearphysicist and educator, hasbeen elected as the Chancel-lor of the University of Nottingham,in the U.K. the first Chinese scholarto hold such a position in a Britishacademic institution, acco...Prof. Yang Fujia, a nuclearphysicist and educator, hasbeen elected as the Chancel-lor of the University of Nottingham,in the U.K. the first Chinese scholarto hold such a position in a Britishacademic institution, according tothe University’s public affairs office. "I feel privileged," said Prof.Yang. "And it is also an honor展开更多
Long-chain alkenones were detected in samples of sea surface sediments from the Chukchi Sea and the Bering Sea areas, the Arctic Pole. The analysis result indicates that C37:3 methylketone is predominate in the long-c...Long-chain alkenones were detected in samples of sea surface sediments from the Chukchi Sea and the Bering Sea areas, the Arctic Pole. The analysis result indicates that C37:3 methylketone is predominate in the long-chain alkenones from the Chukchi and Bering Sea sediments. The abundance of C37 to C39 unsaturated alkenones changes in an order of C37 > C38 > C39. Based on C37 /C38 ratio, the detected organism precursors of the long-chain alkenones are mainly coccolithophrid (Emiliania huxleyi). By the calibration relationship between U37k and U37k indices, the sea surface paleotemperature in these seas is estimated. The estimated values of U37k vary from 4.147℃ to 5.706℃ , with a mean value of 5.092℃.展开更多
The existence of the Cretaceous-Tertiary （K/T） boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Format...The existence of the Cretaceous-Tertiary （K/T） boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Formation in Jiayin were analyzed by the laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb dating and fission-track dating methods. Ages of 64.1±0.7 Ma （U-Pb） and 61.7±1.8 Ma （fission-track dating） were obtained, which allow reevaluation of a previously reported late Maastrichian age for the tuff layer that was in conflict with the paleontological evidence. These results confirm the Danian age of the section in agreement with the paleontological evidence.展开更多
Statistical biases may be introduced by imprecisely quantifying background radiation reference levels. It is, therefore, imperative to devise a simple, adaptable approach for precisely describing the reference backgro...Statistical biases may be introduced by imprecisely quantifying background radiation reference levels. It is, therefore, imperative to devise a simple, adaptable approach for precisely describing the reference background levels of naturally occurring radionuclides (NOR) in mining sites. As a substitute statistical method, we suggest using Bayesian modeling in this work to examine the spatial distribution of NOR. For naturally occurring gamma-induced radionuclides like 232Th, 40K, and 238U, statistical parameters are inferred using the Markov Chain Monte Carlo (MCMC) method. After obtaining an accurate subsample using bootstrapping, we exclude any possible outliers that fall outside of the Highest Density Interval (HDI). We use MCMC to build a Bayesian model with the resampled data and make predictions about the posterior distribution of radionuclides produced by gamma irradiation. This method offers a strong and dependable way to describe NOR reference background values, which is important for managing and evaluating radiation risks in mining contexts.展开更多
AT the 13th Confucius Institute Conference held in Chengdu,capital of southwest China’s Sichuan Province,Professor Sir Keith Burnett,former president and vice chancellor of the University of Sheffield and a member of...AT the 13th Confucius Institute Conference held in Chengdu,capital of southwest China’s Sichuan Province,Professor Sir Keith Burnett,former president and vice chancellor of the University of Sheffield and a member of the Council of Confucius Institute Headquarters,told China Today his experience with China and Chinese people.展开更多
Global abrupt climate change from Marinoan snowball Earth to greenhouse Earth, recorded as cap carbonate overlain on diamictite, had shed the first light on Cambrian bio-radiation. The most documented cap carbonate se...Global abrupt climate change from Marinoan snowball Earth to greenhouse Earth, recorded as cap carbonate overlain on diamictite, had shed the first light on Cambrian bio-radiation. The most documented cap carbonate sections are typical with comprehensive d13 C negative values and ubiquitous sedimentary structures, such as tepee-like, sheet-crack etc., which are associated with successive glacial eustatic variation caused by isostatic rebound in shallow-water facies. Here we report a deepwater basinal cap carbonate section with strong negative δ^(13) C values in the southern margin of the Qinling Orogen,Heyu, Chengkou County, Chongqing in China, which consists of massive dolostone with abundant carbonaceous laminae. However, it lacks the sedimentary structure as mentioned above and is overlain by thin-bedded silicious shales and cherts. A K-bentonite bed was discovered within the base of cap carbonates, about 0.7 m above the top of the Marinoan diamictite. Magmatic zircons that were separated from the K-bentonite bed yield a SIMS concordia U–Pb age of 634.1 ± 1.9 Ma(1 r, MSWDCE= 0.31,ProbabilityCE= 1.000, n = 20). The age is in good agreement with previously reported TIMS U–Pb ages for the termination of Marinoan glaciation and provides ageochronological constraint for the Ediacaran successions in the Qinling Orogen.展开更多
This experiment was conducted in order to verify the role of Vitamin K1 as a cell growth inhibitor on the U937 cell line. This experiment was performed in two parts—one with a lesser concentration of Vitamin K1, and ...This experiment was conducted in order to verify the role of Vitamin K1 as a cell growth inhibitor on the U937 cell line. This experiment was performed in two parts—one with a lesser concentration of Vitamin K1, and the other with a range of concentrations from low-to-high. Through the remaining number of U937 cells, as well as cell areas, it was concluded that the presence of Vitamin K1 reduces the number of cancer cells. It was also concluded that as Vitamin K1 concentration increases, so does the frequency and effects of apoptosis.展开更多
Background:The coronavirus disease 2019(COVID-19)pandemic has led to a paradigm shift in global health,casting a previously niche academic discipline into a headline dominating field of research.However,accurate infor...Background:The coronavirus disease 2019(COVID-19)pandemic has led to a paradigm shift in global health,casting a previously niche academic discipline into a headline dominating field of research.However,accurate information on the delivery of global health education(GHE)at a university level is lacking.This study aims to assess current GIIE practices in U.K.universities,by identifying the availability of dedicated global health qualifications,as well as the breadth of inclusion of GHE topics across university course content.Methods:Universities selected were the top 25 recipients of MRC funding in 2015-2016,as well as universities who were included in previous iterations of the“Global Health League Table”.We used the Consortium of Universities for Global Health“GHE Competencies Toolkit”to identify the presence of global health content across university global health and other course offerings.Universities were additionally judged on opportunities available in global health and on the presence of sustainable partnerships.Results:Our results showed that 20 universities(74%)offer a post-graduate global health related course,with 9(33%)offering an undergraduate global health related course.13(48%)were identified as centers of global health excellence.Just 12(44%)universities had registered sustainable partnerships with Tropical Health and Education Trust.The London School of Hygiene and Tropical Medicine was identified as the top deliverer of GHE,with the Universities of Leicester and the Universities of Exeter joint bottom.We were unable to standardize quality assessments in this iteration of the project,but the release of student feedback to future assessors would help to improve the reliability of this study methodology.Additionally,much of our data was based on information available online,and thus some aspects of degree courses not published publicly may not have been accounted for in our scoring.Conclusion:Those institutions wishing to improve their delivery of GHE should consider the establishment of a postgraduate or undergraduate degree course.Breadth of global health content across curricular was a major discriminating factor between institutions,and we would advise universities to consider including more global health topics across their curricular-especially in light of the intersectional impacts of the COVID-19 pandemic.展开更多
The Huanghe River(Yellow River)Delta has a wide distribution of fine-grained soils.Fluvial alluviation,erosion,and wave loads affect the shoal area,resulting complex physical and mechanical properties to sensitive fin...The Huanghe River(Yellow River)Delta has a wide distribution of fine-grained soils.Fluvial alluviation,erosion,and wave loads affect the shoal area,resulting complex physical and mechanical properties to sensitive finegrained soil located at the river-sea boundary.The cone penetration test(CPT)is a convenient and effective in situ testing method which can accurately identify various soil parameters.Studies on undrained shear strength only roughly determine the fine content(FC)without making the FC effect clear.We studied four stations formed in different the Huanghe River Delta periods.We conducted in situ CPT and corresponding laboratory tests,examined the fine content influence on undrained shear strength(S_(u)),and determined the cone coefficient(N_(k)).The conclusions are as follows.(1)The fine content in the area exceeded 90%,and the silt content was high,accounting for more than 70%of all fine particle compositions.(2)The undrained shear strength gradually increased with depth with a maximum of approximately 250 kPa.When the silt content was lower than 60%–70%,the undrained shear strength decreased.(3)The silt and clay content influenced undrained shear strength,and the fitted f_(s)h/q_(t) function model was established,which could be applied to strata with a high fine content.The cone coefficients were between 20 and 25,and the overconsolidated soil layer had a greater cone coefficient.展开更多
文摘Prof. Yang Fujia, a nuclearphysicist and educator, hasbeen elected as the Chancel-lor of the University of Nottingham,in the U.K. the first Chinese scholarto hold such a position in a Britishacademic institution, according tothe University’s public affairs office. "I feel privileged," said Prof.Yang. "And it is also an honor
基金This study was supported by the First Chinese National Scientific Observation for the Arctic the Development Program of NKBR
文摘Long-chain alkenones were detected in samples of sea surface sediments from the Chukchi Sea and the Bering Sea areas, the Arctic Pole. The analysis result indicates that C37:3 methylketone is predominate in the long-chain alkenones from the Chukchi and Bering Sea sediments. The abundance of C37 to C39 unsaturated alkenones changes in an order of C37 > C38 > C39. Based on C37 /C38 ratio, the detected organism precursors of the long-chain alkenones are mainly coccolithophrid (Emiliania huxleyi). By the calibration relationship between U37k and U37k indices, the sea surface paleotemperature in these seas is estimated. The estimated values of U37k vary from 4.147℃ to 5.706℃ , with a mean value of 5.092℃.
基金the Project NSFC No30220130698the Project "111" of China for their support the National Science Council,Taiwan(grant 97-2811-M- 002-040)
文摘The existence of the Cretaceous-Tertiary （K/T） boundary in the non-marine succession is expected at Jiayin in the Heilongjiang River area, China. Zircons from a tuff sample from the Baishantou Member of Wuyun Formation in Jiayin were analyzed by the laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb dating and fission-track dating methods. Ages of 64.1±0.7 Ma （U-Pb） and 61.7±1.8 Ma （fission-track dating） were obtained, which allow reevaluation of a previously reported late Maastrichian age for the tuff layer that was in conflict with the paleontological evidence. These results confirm the Danian age of the section in agreement with the paleontological evidence.
文摘Statistical biases may be introduced by imprecisely quantifying background radiation reference levels. It is, therefore, imperative to devise a simple, adaptable approach for precisely describing the reference background levels of naturally occurring radionuclides (NOR) in mining sites. As a substitute statistical method, we suggest using Bayesian modeling in this work to examine the spatial distribution of NOR. For naturally occurring gamma-induced radionuclides like 232Th, 40K, and 238U, statistical parameters are inferred using the Markov Chain Monte Carlo (MCMC) method. After obtaining an accurate subsample using bootstrapping, we exclude any possible outliers that fall outside of the Highest Density Interval (HDI). We use MCMC to build a Bayesian model with the resampled data and make predictions about the posterior distribution of radionuclides produced by gamma irradiation. This method offers a strong and dependable way to describe NOR reference background values, which is important for managing and evaluating radiation risks in mining contexts.
文摘AT the 13th Confucius Institute Conference held in Chengdu,capital of southwest China’s Sichuan Province,Professor Sir Keith Burnett,former president and vice chancellor of the University of Sheffield and a member of the Council of Confucius Institute Headquarters,told China Today his experience with China and Chinese people.
基金supported by the National Natural Science Foundation of China(Grant Nos.41072054,40672053,41462001)
文摘Global abrupt climate change from Marinoan snowball Earth to greenhouse Earth, recorded as cap carbonate overlain on diamictite, had shed the first light on Cambrian bio-radiation. The most documented cap carbonate sections are typical with comprehensive d13 C negative values and ubiquitous sedimentary structures, such as tepee-like, sheet-crack etc., which are associated with successive glacial eustatic variation caused by isostatic rebound in shallow-water facies. Here we report a deepwater basinal cap carbonate section with strong negative δ^(13) C values in the southern margin of the Qinling Orogen,Heyu, Chengkou County, Chongqing in China, which consists of massive dolostone with abundant carbonaceous laminae. However, it lacks the sedimentary structure as mentioned above and is overlain by thin-bedded silicious shales and cherts. A K-bentonite bed was discovered within the base of cap carbonates, about 0.7 m above the top of the Marinoan diamictite. Magmatic zircons that were separated from the K-bentonite bed yield a SIMS concordia U–Pb age of 634.1 ± 1.9 Ma(1 r, MSWDCE= 0.31,ProbabilityCE= 1.000, n = 20). The age is in good agreement with previously reported TIMS U–Pb ages for the termination of Marinoan glaciation and provides ageochronological constraint for the Ediacaran successions in the Qinling Orogen.
文摘This experiment was conducted in order to verify the role of Vitamin K1 as a cell growth inhibitor on the U937 cell line. This experiment was performed in two parts—one with a lesser concentration of Vitamin K1, and the other with a range of concentrations from low-to-high. Through the remaining number of U937 cells, as well as cell areas, it was concluded that the presence of Vitamin K1 reduces the number of cancer cells. It was also concluded that as Vitamin K1 concentration increases, so does the frequency and effects of apoptosis.
基金supported by Association of Medical Education Europe's Students Initiative Grant.
文摘Background:The coronavirus disease 2019(COVID-19)pandemic has led to a paradigm shift in global health,casting a previously niche academic discipline into a headline dominating field of research.However,accurate information on the delivery of global health education(GHE)at a university level is lacking.This study aims to assess current GIIE practices in U.K.universities,by identifying the availability of dedicated global health qualifications,as well as the breadth of inclusion of GHE topics across university course content.Methods:Universities selected were the top 25 recipients of MRC funding in 2015-2016,as well as universities who were included in previous iterations of the“Global Health League Table”.We used the Consortium of Universities for Global Health“GHE Competencies Toolkit”to identify the presence of global health content across university global health and other course offerings.Universities were additionally judged on opportunities available in global health and on the presence of sustainable partnerships.Results:Our results showed that 20 universities(74%)offer a post-graduate global health related course,with 9(33%)offering an undergraduate global health related course.13(48%)were identified as centers of global health excellence.Just 12(44%)universities had registered sustainable partnerships with Tropical Health and Education Trust.The London School of Hygiene and Tropical Medicine was identified as the top deliverer of GHE,with the Universities of Leicester and the Universities of Exeter joint bottom.We were unable to standardize quality assessments in this iteration of the project,but the release of student feedback to future assessors would help to improve the reliability of this study methodology.Additionally,much of our data was based on information available online,and thus some aspects of degree courses not published publicly may not have been accounted for in our scoring.Conclusion:Those institutions wishing to improve their delivery of GHE should consider the establishment of a postgraduate or undergraduate degree course.Breadth of global health content across curricular was a major discriminating factor between institutions,and we would advise universities to consider including more global health topics across their curricular-especially in light of the intersectional impacts of the COVID-19 pandemic.
基金The National Natural Science Foundation of China under contract Nos S42177153,U2006213 and 41806075the Shandong Province Focused Research and Development Program under contract No.2019GHY112075the National Major Scientific Research Instrument Development Project under contract No.41627801.
文摘The Huanghe River(Yellow River)Delta has a wide distribution of fine-grained soils.Fluvial alluviation,erosion,and wave loads affect the shoal area,resulting complex physical and mechanical properties to sensitive finegrained soil located at the river-sea boundary.The cone penetration test(CPT)is a convenient and effective in situ testing method which can accurately identify various soil parameters.Studies on undrained shear strength only roughly determine the fine content(FC)without making the FC effect clear.We studied four stations formed in different the Huanghe River Delta periods.We conducted in situ CPT and corresponding laboratory tests,examined the fine content influence on undrained shear strength(S_(u)),and determined the cone coefficient(N_(k)).The conclusions are as follows.(1)The fine content in the area exceeded 90%,and the silt content was high,accounting for more than 70%of all fine particle compositions.(2)The undrained shear strength gradually increased with depth with a maximum of approximately 250 kPa.When the silt content was lower than 60%–70%,the undrained shear strength decreased.(3)The silt and clay content influenced undrained shear strength,and the fitted f_(s)h/q_(t) function model was established,which could be applied to strata with a high fine content.The cone coefficients were between 20 and 25,and the overconsolidated soil layer had a greater cone coefficient.
