Crop calendar is an important tool providing relevant information on crops cycles in a specific area for effective agricultural management. Crop calendars vary in different areas given dissimilarities in agro-ecosyst...Crop calendar is an important tool providing relevant information on crops cycles in a specific area for effective agricultural management. Crop calendars vary in different areas given dissimilarities in agro-ecosystems＇ characteristics. This research used multi-temporal MODIS NDVI stratification to assess differences in practiced maize crop calendars in various areas of Rwanda. Four（4） sample NDVI strata dominated by agriculture were purposively chosen, and 433 local farmers were randomly selected from the strata for interviews. The collected information helped to know about their maize planting as well as harvesting dates in order to generate maize calendars per NDVI strata. The generated crop calendars were later classified using k-means unsupervised classification, and produced 4 groupings of practiced maize calendars irrespective of NDVI strata. ANOVA results revealed significant differences between both the generated maize crop calendars by NDVI strata and the practiced crop calendars irrespective of NDVI strata, at p = 0.05. Moreover, chi-square tests and t-tests revealed not only a significant relationship between maize calendars and number of crop growing seasons, but also a significant relationship between maize calendars and NDVI strata, at p = 0.05. Finally, findings of this research contrasted the present conviction that there exist a single general maize calendar all over the country. Instead, the results were in accordance with the fact that Rwanda agro-ecosystems differ from East to West in terms of, mainly, altitude and rainfall patterns variations.展开更多
Asia 2024'Happy Chinese New Year at University of Malaya On January 17,China Cultural Center in Kuala Lumpur launched the"Happy Chinese NewYear"series of activities at the University of Malaya to celebra...Asia 2024'Happy Chinese New Year at University of Malaya On January 17,China Cultural Center in Kuala Lumpur launched the"Happy Chinese NewYear"series of activities at the University of Malaya to celebrate the upcoming Year of the Dragon in the Chinese Lunar Calendar。展开更多
The Chinese New Year celebrations highlight the importance of cultural connections.Africa is not just a geographical location;it’s a mosaic of ancient civilisations and indigenous knowledge blended with the dynamics ...The Chinese New Year celebrations highlight the importance of cultural connections.Africa is not just a geographical location;it’s a mosaic of ancient civilisations and indigenous knowledge blended with the dynamics of a modern society.These attributes create the right platform for growing China-Africa bonds.Many nations in the East celebrate the Spring Festival,or the Chinese New Year,which indicates the arrival of spring,a season that brings new life and reinvigorates one that is dormant.The festival has also been officially listed as a United Nations Floating Holiday in the UN Calendar of Conferences and Meetings starting in 2024.展开更多
Ethiopia-Djibouti Railway Reports Surge in Revenue.The Chinese-built Ethiopia-Djibouti railway has transported 680,000 passengers and 9.5 million tonnes of cargo,with its annual transportation revenue increasing 39 pe...Ethiopia-Djibouti Railway Reports Surge in Revenue.The Chinese-built Ethiopia-Djibouti railway has transported 680,000 passengers and 9.5 million tonnes of cargo,with its annual transportation revenue increasing 39 percent on average over the past six years.The railway’s Chinese management consortium on 17 May disclosed that the 752-km Ethiopia-Djibouti railway has seen the operation of 2,500 passenger trains with a passenger volume of 680,000 since it started commercial operations in January 2018.Data from the railway’s management team also show that the railway has operated 7,700 freighttrains with cargo volume of 9.5 million tonnes,and achieved the total commercial transport revenue of 11.3 billion Ethiopian birr(about$197 million)during the same period.展开更多
Background:Traditional Chinese medicine(TCM)as a traditional Chinese medical practice,has gradually evolved into a coherent and systematic medical science based on natural principles and applied to human beings over t...Background:Traditional Chinese medicine(TCM)as a traditional Chinese medical practice,has gradually evolved into a coherent and systematic medical science based on natural principles and applied to human beings over time.The publication of the“Huangdi Neijing”(The Yellow Emperor’s Classic of Internal Medicine,Written between the Warring States period and the Qin and Han Dynasties,and finally compiled in the Western Han Dynasty,from 475 B.C.E.-8 C.E.)signified the establishment of a comprehensive theoretical framework for Chinese medicine.Due to the perspective of the‘correspondence between heaven and man’in TCM,the purpose of this paper is to explore the origin and development of the basic theories of TCM under the ancient astronomical view and the connection between the two.Methods:This paper emphases on the universe uninty with the humanities,philosophy,and medicine,starting with the forms of stargazing in ancient Chinese astronomy and the natural laws derived by the ancients from their observations of natural celestial phenomena.Results:Astronomy,arts and crafts,divination and medical correlations are based on the sequential changes of natural seasons.Conclusion:The operation of natural celestial phenomena and the characteristics of physical phenomena correspond to human physiology,and the development of the basic theories of Chinese medicine is inextricably linked to ancient astronomy,ancient philosophy,and ancient primeval science.展开更多
Google Calendar作为一款基于事件的日历系统,以友好的操作界面和实用的功能而著称。在事件的显示方面,通过自适应调整事件宽度的方式进行排列,避免事件之间的重叠,直观地反映事件的时间与分布。该文对Google Calendar中事件排列显示的...Google Calendar作为一款基于事件的日历系统,以友好的操作界面和实用的功能而著称。在事件的显示方面,通过自适应调整事件宽度的方式进行排列,避免事件之间的重叠,直观地反映事件的时间与分布。该文对Google Calendar中事件排列显示的方式进行了解析,对其中的概念进行了抽象与定义,并提出了一种相应的算法实现。展开更多
We report a novel finding that Stonehenge in England and Ales Stones in Sweden were built with the same basic geometry and using the megalithic yard as standard of measure. This opens quite new perspectives into cultu...We report a novel finding that Stonehenge in England and Ales Stones in Sweden were built with the same basic geometry and using the megalithic yard as standard of measure. This opens quite new perspectives into cultural influence, travel and trading in the Bronze Age.展开更多
Double-and triple-cropping in a year have played a very important role in meeting the rising need for food in China.However,the intensified agricultural practices have significantly altered biogeochemical cycles and s...Double-and triple-cropping in a year have played a very important role in meeting the rising need for food in China.However,the intensified agricultural practices have significantly altered biogeochemical cycles and soil quality.Understanding and mapping cropping intensity in China′s agricultural systems are therefore necessary to better estimate carbon,nitrogen and water fluxes within agro-ecosystems on the national scale.In this study,we investigated the spatial pattern of crop calendar and multiple cropping rotations in China using phenological records from 394 agro-meteorological stations(AMSs)across China.The results from the analysis of in situ field observations were used to develop a new algorithm that identifies the spatial distribution of multiple cropping in China from moderate resolution imaging spectroradiometer(MODIS)time series data with a 500 m spatial resolution and an 8-day temporal resolution.According to the MODIS-derived multiple cropping distribution in 2002,the proportion of cropland cultivated with multiple crops reached 34%in China.Double-cropping accounted for approximately 94.6%and triple-cropping for 5.4%.The results demonstrat that MODIS EVI(Enhanced Vegetation Index)time series data have the capability and potential to delineate the dynamics of double-and triple-cropping practices.The resultant multiple cropping map could be used to evaluate the impacts of agricultural intensification on biogeochemical cycles.展开更多
Dear Editor, Lithium-ion(Li-ion) battery has become a promising source to supply and absorb energy/power for many energy-transportation applications. However, Li-ion battery capacity would inevitably degrade over time...Dear Editor, Lithium-ion(Li-ion) battery has become a promising source to supply and absorb energy/power for many energy-transportation applications. However, Li-ion battery capacity would inevitably degrade over time, making its related ageing prediction necessary.展开更多
The airborne pollen grains of Afyon have been studied for a two_year period (1999-2000) with a Durham sampler. A total of 14 367 pollen grains belonging to 40 taxa have been identified and recorded with some unidentif...The airborne pollen grains of Afyon have been studied for a two_year period (1999-2000) with a Durham sampler. A total of 14 367 pollen grains belonging to 40 taxa have been identified and recorded with some unidentified ones. Of them, 6 732 were identified in 1999 and 7 635 in 2000. Of the total pollen grains, 69.67% were arboreal, 26.64% non_arboreal and 3.68 % unidentified. The majority of the investigated pollen grains were from Pinus, Gramineae, Cupressaceae, Platanus , Chenopodiaceae/Amaranthaceae, Quercus, Ailanthus, Moraceae, Juglans , Salix, Cedrus and Rosaceae. The highest level of pollen grains was in May.展开更多
In architecture and urban design,solar energy plays an important role to save fossil energy and preserve environment.Passive or active use of this energy needs especial consideration in the preliminary stage of design...In architecture and urban design,solar energy plays an important role to save fossil energy and preserve environment.Passive or active use of this energy needs especial consideration in the preliminary stage of design to the probable shadows.This work will answer two questions:1) How is it possible to distinguish shadow need periods during a year in a specific climate-2) How is it possible to produce shadow in hot periods without being deprived of pleasant sunshine in cold periods-In this regard,it will introduce the usage process and opportunities of "shading mask" of Olgyay as an easy and useful graphical method in six steps.At the end,different ways of using this method in design will be discussed.Several research projects that have been done in past 30 years will support the argument as examples of this method.展开更多
To address the challenges posed by resource shortage or surplus to enterprises productivity,Internet platforms have been widely used,which can balance shortage and surplus in broader environments. However,the existing...To address the challenges posed by resource shortage or surplus to enterprises productivity,Internet platforms have been widely used,which can balance shortage and surplus in broader environments. However,the existing resource management models lack openness,sharing ability and scalability,which make it difficult for many heterogeneous resources to co-exist in the same system. It is also difficult to resolve the conflicts between distributed self-management and centralized scheduling in the system. This paper analyzes the characteristics of resources in the distributed environment and proposes a new resource management architecture by considering the resource aggregation capacity of cloud computing. The architecture includes a universal resource scheduling optimization model which has been applied successfully in double-district multi-ship-scheduling multi-container-yard empty containers transporting of international shipping logistics. Applications in all these domains prove that this new resource management architecture is feasible and can achieve the expected effect.展开更多
基金The Natural Science Foundation of China(41561144011,41761144053)International Partnership Program of Chinese Academy of Sciences(121311KYSB20170004)
文摘Crop calendar is an important tool providing relevant information on crops cycles in a specific area for effective agricultural management. Crop calendars vary in different areas given dissimilarities in agro-ecosystems＇ characteristics. This research used multi-temporal MODIS NDVI stratification to assess differences in practiced maize crop calendars in various areas of Rwanda. Four（4） sample NDVI strata dominated by agriculture were purposively chosen, and 433 local farmers were randomly selected from the strata for interviews. The collected information helped to know about their maize planting as well as harvesting dates in order to generate maize calendars per NDVI strata. The generated crop calendars were later classified using k-means unsupervised classification, and produced 4 groupings of practiced maize calendars irrespective of NDVI strata. ANOVA results revealed significant differences between both the generated maize crop calendars by NDVI strata and the practiced crop calendars irrespective of NDVI strata, at p = 0.05. Moreover, chi-square tests and t-tests revealed not only a significant relationship between maize calendars and number of crop growing seasons, but also a significant relationship between maize calendars and NDVI strata, at p = 0.05. Finally, findings of this research contrasted the present conviction that there exist a single general maize calendar all over the country. Instead, the results were in accordance with the fact that Rwanda agro-ecosystems differ from East to West in terms of, mainly, altitude and rainfall patterns variations.
文摘Asia 2024'Happy Chinese New Year at University of Malaya On January 17,China Cultural Center in Kuala Lumpur launched the"Happy Chinese NewYear"series of activities at the University of Malaya to celebrate the upcoming Year of the Dragon in the Chinese Lunar Calendar。
文摘The Chinese New Year celebrations highlight the importance of cultural connections.Africa is not just a geographical location;it’s a mosaic of ancient civilisations and indigenous knowledge blended with the dynamics of a modern society.These attributes create the right platform for growing China-Africa bonds.Many nations in the East celebrate the Spring Festival,or the Chinese New Year,which indicates the arrival of spring,a season that brings new life and reinvigorates one that is dormant.The festival has also been officially listed as a United Nations Floating Holiday in the UN Calendar of Conferences and Meetings starting in 2024.
文摘Ethiopia-Djibouti Railway Reports Surge in Revenue.The Chinese-built Ethiopia-Djibouti railway has transported 680,000 passengers and 9.5 million tonnes of cargo,with its annual transportation revenue increasing 39 percent on average over the past six years.The railway’s Chinese management consortium on 17 May disclosed that the 752-km Ethiopia-Djibouti railway has seen the operation of 2,500 passenger trains with a passenger volume of 680,000 since it started commercial operations in January 2018.Data from the railway’s management team also show that the railway has operated 7,700 freighttrains with cargo volume of 9.5 million tonnes,and achieved the total commercial transport revenue of 11.3 billion Ethiopian birr(about$197 million)during the same period.
基金the support of the Fund’s programme named Yunnan Provincial Science and Technology Department-Applied Basic Research Joint Special Funds of Chinese Medicine(202101AZ070001-061).
文摘Background:Traditional Chinese medicine(TCM)as a traditional Chinese medical practice,has gradually evolved into a coherent and systematic medical science based on natural principles and applied to human beings over time.The publication of the“Huangdi Neijing”(The Yellow Emperor’s Classic of Internal Medicine,Written between the Warring States period and the Qin and Han Dynasties,and finally compiled in the Western Han Dynasty,from 475 B.C.E.-8 C.E.)signified the establishment of a comprehensive theoretical framework for Chinese medicine.Due to the perspective of the‘correspondence between heaven and man’in TCM,the purpose of this paper is to explore the origin and development of the basic theories of TCM under the ancient astronomical view and the connection between the two.Methods:This paper emphases on the universe uninty with the humanities,philosophy,and medicine,starting with the forms of stargazing in ancient Chinese astronomy and the natural laws derived by the ancients from their observations of natural celestial phenomena.Results:Astronomy,arts and crafts,divination and medical correlations are based on the sequential changes of natural seasons.Conclusion:The operation of natural celestial phenomena and the characteristics of physical phenomena correspond to human physiology,and the development of the basic theories of Chinese medicine is inextricably linked to ancient astronomy,ancient philosophy,and ancient primeval science.
文摘We report a novel finding that Stonehenge in England and Ales Stones in Sweden were built with the same basic geometry and using the megalithic yard as standard of measure. This opens quite new perspectives into cultural influence, travel and trading in the Bronze Age.
基金Under the auspices of Strategic Priority Research Program-Climate Change:Carbon Budget and Relevant Issues of Chinese Academy of Sciences(No.XDA05050602)Major State Basic Research Development Program of China(No.2010CB950904)+1 种基金National Natural Science Foundation of China(No.40921140410,41071344)Land Cover and Land Use Change Program of National Aeronautics and Space Administration,USA(No.NAG5-11160,NNG05GH80G)
文摘Double-and triple-cropping in a year have played a very important role in meeting the rising need for food in China.However,the intensified agricultural practices have significantly altered biogeochemical cycles and soil quality.Understanding and mapping cropping intensity in China′s agricultural systems are therefore necessary to better estimate carbon,nitrogen and water fluxes within agro-ecosystems on the national scale.In this study,we investigated the spatial pattern of crop calendar and multiple cropping rotations in China using phenological records from 394 agro-meteorological stations(AMSs)across China.The results from the analysis of in situ field observations were used to develop a new algorithm that identifies the spatial distribution of multiple cropping in China from moderate resolution imaging spectroradiometer(MODIS)time series data with a 500 m spatial resolution and an 8-day temporal resolution.According to the MODIS-derived multiple cropping distribution in 2002,the proportion of cropland cultivated with multiple crops reached 34%in China.Double-cropping accounted for approximately 94.6%and triple-cropping for 5.4%.The results demonstrat that MODIS EVI(Enhanced Vegetation Index)time series data have the capability and potential to delineate the dynamics of double-and triple-cropping practices.The resultant multiple cropping map could be used to evaluate the impacts of agricultural intensification on biogeochemical cycles.
文摘Dear Editor, Lithium-ion(Li-ion) battery has become a promising source to supply and absorb energy/power for many energy-transportation applications. However, Li-ion battery capacity would inevitably degrade over time, making its related ageing prediction necessary.
文摘The airborne pollen grains of Afyon have been studied for a two_year period (1999-2000) with a Durham sampler. A total of 14 367 pollen grains belonging to 40 taxa have been identified and recorded with some unidentified ones. Of them, 6 732 were identified in 1999 and 7 635 in 2000. Of the total pollen grains, 69.67% were arboreal, 26.64% non_arboreal and 3.68 % unidentified. The majority of the investigated pollen grains were from Pinus, Gramineae, Cupressaceae, Platanus , Chenopodiaceae/Amaranthaceae, Quercus, Ailanthus, Moraceae, Juglans , Salix, Cedrus and Rosaceae. The highest level of pollen grains was in May.
文摘In architecture and urban design,solar energy plays an important role to save fossil energy and preserve environment.Passive or active use of this energy needs especial consideration in the preliminary stage of design to the probable shadows.This work will answer two questions:1) How is it possible to distinguish shadow need periods during a year in a specific climate-2) How is it possible to produce shadow in hot periods without being deprived of pleasant sunshine in cold periods-In this regard,it will introduce the usage process and opportunities of "shading mask" of Olgyay as an easy and useful graphical method in six steps.At the end,different ways of using this method in design will be discussed.Several research projects that have been done in past 30 years will support the argument as examples of this method.
基金Support by the National Key Technology Research and Development Program of China(No.2012BAA13B01,2014BAF07B02)the National Natural Science Foundation of China(No.61273038)+1 种基金Natural Science Foundation of Shandong Province(No.ZR2015FM006)Science and Technology Major Project of the Ministry of Science and Technology of Shandong Province(No.2015ZDXX0201B02)
文摘To address the challenges posed by resource shortage or surplus to enterprises productivity,Internet platforms have been widely used,which can balance shortage and surplus in broader environments. However,the existing resource management models lack openness,sharing ability and scalability,which make it difficult for many heterogeneous resources to co-exist in the same system. It is also difficult to resolve the conflicts between distributed self-management and centralized scheduling in the system. This paper analyzes the characteristics of resources in the distributed environment and proposes a new resource management architecture by considering the resource aggregation capacity of cloud computing. The architecture includes a universal resource scheduling optimization model which has been applied successfully in double-district multi-ship-scheduling multi-container-yard empty containers transporting of international shipping logistics. Applications in all these domains prove that this new resource management architecture is feasible and can achieve the expected effect.
