Twenty four solar terms is a knowledge system formed by the ancients through long-term observation of the annual activities of the sun.Although it roughly reveals the changing rules of seasons,climate and phenology in...Twenty four solar terms is a knowledge system formed by the ancients through long-term observation of the annual activities of the sun.Although it roughly reveals the changing rules of seasons,climate and phenology in a year,and reflects the influence of the sun on the earth’s climate change on a large scale,because the ancients ignored the influence of the moon’s activities on the earth’s climate change on a small scale,the 24 solar terms they summarized often can not accurately predict the earth's climate change.In order to make the 24 solar terms reflect not only the influence of the sun on the earth's climate change on a large scale,but also the influence of the moon's activities on the earth's climate change on a small scale,we must refer to the key time nodes of the moon's activities to divide the 24 solar terms.That is to say,the first day(the seventh or twenty second day of the lunar calendar)after the“Greater Cold”of the old year should be set as the“Beginning of Spring”of the new year,and then the day after half a month should be the next solar term,which is the first day of the moon’s next visit to the Antarctic or the Arctic,and so on.In this way,the 24 solar terms are consistent with the key nodes of lunar activities,and can accurately predict the changes of the earth's climate.展开更多
China’s“24 Solar Terms”,known as the fifth invention after China’s hour Major Inventions,is a knowledge system and social practice formed through observations of the sun’s annual motion,and cognition of the year...China’s“24 Solar Terms”,known as the fifth invention after China’s hour Major Inventions,is a knowledge system and social practice formed through observations of the sun’s annual motion,and cognition of the year’s changes in season,climate and phenology.More and more people in the world have been eager to know more about it since UNESCO inscribed Chinas“24 Solar Terms”on the Representative List of the Intangible Cultural Heritage of Humanity in 2016.As a way of nurturing life,the Illustrated Daoyin of the 24 Solar Terms includes twenty-four exercise forms,corresponding to the 24 solar terms respectively,which reflects the significant idea of complying with the law of yin-yang changes in the universe.It presents a series of sitting and standing exercises designed to prevent diseases that occur during seasonal changes throughout the year.The ancient Chinese wisdom of time and life nurturing has been witnessed in China’s“24 Solar Terms”and“Illustrated Daoyin of the 24 Solar Terms”This article aims to arouse readers’concern and interest in life nurturing by introducing how to do all the exercises presented by the Illustrated Daoyin of the 24 Solar Terms,which is helpful to the prevention and cure of diseases as well as good for health.展开更多
Solar terms and festivals differ from and relate to each other in terms of application scope and cultural structure.The cultural association and application of the 24 Solar Terms are studied in the areas including phi...Solar terms and festivals differ from and relate to each other in terms of application scope and cultural structure.The cultural association and application of the 24 Solar Terms are studied in the areas including philosophy,farming and society,and are exhibited in the natural convergence of views on space and time,life and customs,as well as the facilitation of agricultural practice.The connotations of traditional Chinese festivals concern basic areas such as beliefs,rites,language,symbols,diets and art,which are exhibited in the co-existent "festival tokens," "festival events," "festival messages," "festival symbols," "festival food" and "festival art forms." Festivals feature fixed and periodic occurrence and multi-channel cultural inheritance.展开更多
The "Twenty-Four Solar Terms" is an integrated knowledge system and functional social practice initiated and developed by ancient Chinese. Appling to their daily lives and agricultural production, based on r...The "Twenty-Four Solar Terms" is an integrated knowledge system and functional social practice initiated and developed by ancient Chinese. Appling to their daily lives and agricultural production, based on records of the periodic motions of the sun, this knowledge system echoes seasonal and climate changes, phenological variation and reflects the features of ancient agricultural activities. As a comprehensive demonstration of their lives and production, it is a phenomenal achievement thanks to the ancient Chinese people's experience and wisdom. The "Twenty-Four Solar Terms" is also a cultural phenomenon unique to China, geographic location, the Yellow River Basin being at a mid-latitude zone with distinctive seasonal climate changes; its long-existing agrarian tradition, advanced agricultural philosophy and a harmonious lifestyle. In the meantime, while China's superior knowledge on astronomy made its formation technically possible, the "agriculture first" governmental policy and the "prefectures and counties" administrative system, introduced by governors from Qin and Han Dynasties, cultivated its formation institutionally. Besides, the "Twenty-Four Solar Terms" is the outcome of the harmonious civilization progress and traditional Chinese culture, which is different from Western Europe's aggressive and predatory industrial expansion. The "Twenty-Four Solar Terms" is still of great cultural and practical significance in China even today. It highlights the "unity of mankind and nature" philosophy and serves as another signature symbol of the Chinese culture. While China is more and more engaging in international affairs, the "Twenty-Four Solar Terms" facilitates the rest of the world to understand China from another angle.展开更多
Up to now,there are few academic studies on the great astronomer,Luoxia Hong and the English translation of the 24 Solar Terms.Through the study of Luoxia Hong and the 24 Solar Terms and their English translations,thi...Up to now,there are few academic studies on the great astronomer,Luoxia Hong and the English translation of the 24 Solar Terms.Through the study of Luoxia Hong and the 24 Solar Terms and their English translations,this paper aims to,firstly,further reconfirm the historical status of Luoxia Hong and secondly,make a comparative study of the different translation versions of 24 Solar Terms from the perspective of translation studies,so that more people,home and abroad,can get more familiar with the historical and cultural celebrity Luoxia Hong and traditional Chinese culture.展开更多
In the current era of rapid development, excellent culture needs to be inherited and spread to the world. Therefore, it is essential to consider the translation of the 24 solar terms. China persists in the principle o...In the current era of rapid development, excellent culture needs to be inherited and spread to the world. Therefore, it is essential to consider the translation of the 24 solar terms. China persists in the principle of the Belt and Road Initiative, adheres to the guidance of Chinese traditional excellent culture goes global, and enhances the influence of Chinese culture on the words, the culture of the words communicating and developing constantly. This paper analyzes and compares translations of different versions, explores the necessity of translation strategies for translation, then summaries the translation strategy, ultimately figures out the development space, ted texts and promote the exchange of Chinese and foreign cultures.展开更多
This book is the compendium of Chinese meteorologist Song Yingjie's research on the 24 solar terms.It encompasses the author's years of accumulated research,data,and cultural knowledge.From a meteorological pe...This book is the compendium of Chinese meteorologist Song Yingjie's research on the 24 solar terms.It encompasses the author's years of accumulated research,data,and cultural knowledge.From a meteorological perspective,this book applies charts based on climate big data,combined with literary writing techniques and meteorological algorithms,to present the knowledge of the twenty-four solar terms to readers.展开更多
In the traditional Chinese Medicine(TCM), the timing of performing the treatment during the year is always an important factor for maximizing its effectiveness. Based on over half a century of observational and reanal...In the traditional Chinese Medicine(TCM), the timing of performing the treatment during the year is always an important factor for maximizing its effectiveness. Based on over half a century of observational and reanalysis data, a modified calendric system, named the Twenty-four Medical Terms(24-MTs), has been established for China's Mainland following a systematic calibration and geographical adjustment of the classic Twenty-four Solar Terms(24-STs). In view of "adapting the human body to the changing universe", a core philosophy of the TCM, this improved medical calendar is expected to make a significant contribution to the development of precise Chinese Medicine in the big data era. Specifically, two maps of localized timings for the so-called Triple-Fu(TF) and Triple-Jiu(TF) defined using a joint heat index of air temperature and relative humidity are created as an alternative to the two nationwide unified timings representing the warmest and coldest periods of the year. These location-specific medical calendars, with a maximum regional time shift of one week for TJ and a systematic advancing of 3.6–28.2 days for TF in China's Mainland, are thought to be clinically useful for carrying out precise TCM such as"treating winter deceases in summer". In addition, similar maps of localized timings for peak spring and peak autumn defined as the days of fastest warming and cooling around the years are generated for China's Mainland, so as to provide a helpful guidance for practicing season(ST/MT) related and geographically dependent precise health care in the context of "born in spring, grow in summer, harvest in autumn, and preserve in winter", which is a key ideology in the TCM.展开更多
The story of the Twenty-four Solar Terms(24-ST_s) is one of the most popular elements in Chinese culture, which has a profound influence on agriculture production, health care, and even daily life in both ancient and ...The story of the Twenty-four Solar Terms(24-ST_s) is one of the most popular elements in Chinese culture, which has a profound influence on agriculture production, health care, and even daily life in both ancient and modern China. This traditional calendric system was invented by the Chinese ancestors through combining fundamental astronomical knowledge with climatic and phenological conditions in the Yellow River Basin some 2000 years ago. Although the basic philosophy of the 24-ST_s remains valid for the country as a whole to date, their regional robustness has been increasingly challenged by accumulating observational data in terms of temporal shift and spatial inhomogeneity. To tackle these issues, we propose to recalibrate the medically related critical timings of Great Heat and Great Cold in the classic ST system by using big meteorological data, and adjust them by introducing geographically correlated analytical models. As a result, a novel calendric system, called the Twenty-four Medical Terms(24-MT_s), has been developed as an upgraded version of the traditional 24-ST_s. The proposed 24-MT_s are characterized by two striking features with respect to the 24-ST_s: A varying duration of each MT instead of a fixed one for the ST, and a geographically dependent timing for each MT instead of a unified one for the entire nation. As such, the updated 24-MT_s are expected to provide a more realistic estimate of these critical timings around the year, and hence, a more precise guidance to agronomic planning and health care activity in China.展开更多
This study focuses on the perspective of solar terms marketing to explore how Chinese culture empowers the transformation of the Liaoning Sea Cucumber marketing model.By exploring the cultural and social values of the...This study focuses on the perspective of solar terms marketing to explore how Chinese culture empowers the transformation of the Liaoning Sea Cucumber marketing model.By exploring the cultural and social values of the twenty-four solar terms,the paper reveals the potential role of this traditional element in modern marketing.Furthermore,this paper examines traditional industries,especially the challenges and opportunities of the sea cucumber industry,which is primarily based on offline sales,in digital transformation.Taking Liaoning Sea Cucumber as an example,it discusses how to leverage online marketing strategies,such as targeting the high-end market,catering to the trend of youthful consumption,and innovating industry models,to assist the industry in achieving digital upgrades in intense market competition.This not only provides practical references and strategic insights for the sea cucumber industry but also for the transformation of other traditional industries in the modern consumer environment.展开更多
The temperature thresholds and timings of the 24 climatic Solar Terms in China are determined from a homogenized dataset of the surface air temperature recorded at 549 meteorological stations for the period 1960-2008 ...The temperature thresholds and timings of the 24 climatic Solar Terms in China are determined from a homogenized dataset of the surface air temperature recorded at 549 meteorological stations for the period 1960-2008 employing the ensemble empirical mode decomposition method.Changes in the mean temperature and timing of the climatic solar terms are illustrated.The results show that in terms of the mean situation over China,the number of cold days such as those of Slight Cold and Great Cold has decreased,especially by 56.8% for Great Cold in the last 10 years(1998-2007) compared with in the 1960s.The number of hot days like those of Great Heat has increased by 81.4% in the last 10 years compared with in the 1960s.The timings of the climatic Solar Terms during the warming period(around spring) in the seasonal cycle have advanced significantly by more than 6 d,especially by 15 d for Rain Water,while those during the cooling period(around autumn) have delayed significantly by 5-6 d.These characteristics are mainly due to a warming shift of the whole seasonal cycle under global warming.However,the warming shift affects the different Solar Terms to various extents,more prominently in the spring than in the autumn.The warming tendencies for Rain Water,the Beginning of Spring,and the Waking of Insects are the largest,2.43?C,2.37?C,and 2.21?C,respectively,for the period 1961-2007 in China as a whole.Four particular phenology-related climatic Solar Terms,namely the Waking of Insects,Pure Brightness,Grain Full,and Grain in Ear,are found to have advanced almost everywhere.In semi-arid zones in northern China,advances of the timings of these four climatic Solar Terms are significant,12-16,4-8,4-8,and 8-12 d,respectively,for the period 1961-2007.These quantitative results provide a scientific base for climate change adaptation,especially in terms of agricultural planning and energy-saving management throughout a year.展开更多
Calendar is an important driving factor of electricity demand. Therefore, many load forecasting models would incorporate calendar information. Frequently used calendar variables include hours of a day, days of a week,...Calendar is an important driving factor of electricity demand. Therefore, many load forecasting models would incorporate calendar information. Frequently used calendar variables include hours of a day, days of a week,months of a year, and so forth. During the past several decades, a widely-used calendar in load forecasting is the Gregorian calendar from the ancient Rome, which dissects a year into 12 months based on the Moon's orbit around the Earth. The applications of alternative calendars have rarely been reported in the load forecasting literature. This paper aims at discovering better means than Gregorian calendar to categorize days of a year for load forecasting.One alternative is the solar-term calendar, which divides the days of a year into 24 terms based on the Sun's position in the zodiac. It was originally from the ancient China to guide people for their agriculture activities. This paper proposes a novel method to model the seasonal change for load forecasting by incorporating the 24 solar terms in regression analysis. The case study is conducted for the eight load zones and the system total of ISO New England.Results from both cross-validation and sliding simulationshow that the forecast based on the 24 solar terms is more accurate than its counterpart based on the Gregorian calendar.展开更多
In recent years, introduction of a renewable energy source such as solar energy is expected. However, solar radiation is not constant and power output of photovoltaic (PV) system is influenced by weather conditions. I...In recent years, introduction of a renewable energy source such as solar energy is expected. However, solar radiation is not constant and power output of photovoltaic (PV) system is influenced by weather conditions. It is difficult for getting to know accurate power output of PV system. In order to forecast the power output of PV system as accurate as possible, this paper proposes a decision technique of forecasting model for short-term-ahead power output of PV system based on solar radiation prediction. Application of Recurrent Neural Network (RNN) is shown for solar radiation prediction in this paper. The proposed method in this paper does not require complicated calculation, but mathematical model with only useful weather data. The validity of the proposed RNN is confirmed by comparing simulation results of solar radiation forecasting with that obtained from other展开更多
In this study, atmospheric visibility (AV) data from Riyadh, Saudi Arabia (24.91<span style="white-space:nowrap;">˚</span>N, 46.41<span style="white-space:nowrap;">&#...In this study, atmospheric visibility (AV) data from Riyadh, Saudi Arabia (24.91<span style="white-space:nowrap;">˚</span>N, 46.41<span style="white-space:nowrap;">˚</span>E, 760 m), for the period 1976-2011 were utilized to investigate the interannual, monthly, and seasonal AV variations and trends. The magnitudes of these trends were characterized and tested using mann-kendall (MK) rank statistics at different significance levels. No significant trend in AV was observed during the 36-year period. However, a significant increase in the annual mean AV by 0.24 km per year for the period between 1976 and 1999 was found. For the period 1999-2011, AV decreased significantly by 0.16 km per year. The potential effects of air temperature and relative humidity on AV were investigated. While these two variables could explain the observed trend of AV over some periods, they failed to do so for the whole study period. To search for extraterrestrial causes for long-term AV variations, correlation analyses between the time series of cosmic ray (CR) data (measured by NM and muon detector) and solar activity (represented by sunspot number) and AV were conducted and showed that these two variables are able to explain the AV variations for the whole study period. Additionally, power spectra analyses were conducted to investigate periodicities in the AV time series. Several significant periodicities, such as 9.8, 5.2, 2.2, 1.7, and 1.3 years were recognized. The obtained periodicities were similar to those reported by several investigators and found in solar, interplanetary, and CR parameters. The spectral and correlation results suggested that, with the expected effects of terrestrial and meteorological conditions on AV, long-term AV variations can also be related to the solar activity and associated CR modulations.展开更多
文摘Twenty four solar terms is a knowledge system formed by the ancients through long-term observation of the annual activities of the sun.Although it roughly reveals the changing rules of seasons,climate and phenology in a year,and reflects the influence of the sun on the earth’s climate change on a large scale,because the ancients ignored the influence of the moon’s activities on the earth’s climate change on a small scale,the 24 solar terms they summarized often can not accurately predict the earth's climate change.In order to make the 24 solar terms reflect not only the influence of the sun on the earth's climate change on a large scale,but also the influence of the moon's activities on the earth's climate change on a small scale,we must refer to the key time nodes of the moon's activities to divide the 24 solar terms.That is to say,the first day(the seventh or twenty second day of the lunar calendar)after the“Greater Cold”of the old year should be set as the“Beginning of Spring”of the new year,and then the day after half a month should be the next solar term,which is the first day of the moon’s next visit to the Antarctic or the Arctic,and so on.In this way,the 24 solar terms are consistent with the key nodes of lunar activities,and can accurately predict the changes of the earth's climate.
基金Research Base Projects of Beijing Social Science Foundation(No.17JDYYB002)。
文摘China’s“24 Solar Terms”,known as the fifth invention after China’s hour Major Inventions,is a knowledge system and social practice formed through observations of the sun’s annual motion,and cognition of the year’s changes in season,climate and phenology.More and more people in the world have been eager to know more about it since UNESCO inscribed Chinas“24 Solar Terms”on the Representative List of the Intangible Cultural Heritage of Humanity in 2016.As a way of nurturing life,the Illustrated Daoyin of the 24 Solar Terms includes twenty-four exercise forms,corresponding to the 24 solar terms respectively,which reflects the significant idea of complying with the law of yin-yang changes in the universe.It presents a series of sitting and standing exercises designed to prevent diseases that occur during seasonal changes throughout the year.The ancient Chinese wisdom of time and life nurturing has been witnessed in China’s“24 Solar Terms”and“Illustrated Daoyin of the 24 Solar Terms”This article aims to arouse readers’concern and interest in life nurturing by introducing how to do all the exercises presented by the Illustrated Daoyin of the 24 Solar Terms,which is helpful to the prevention and cure of diseases as well as good for health.
基金a staged research result of "Studies on China’s Newly Emerged Festival Activities"funded by the Central Research Institute of Culture and History
文摘Solar terms and festivals differ from and relate to each other in terms of application scope and cultural structure.The cultural association and application of the 24 Solar Terms are studied in the areas including philosophy,farming and society,and are exhibited in the natural convergence of views on space and time,life and customs,as well as the facilitation of agricultural practice.The connotations of traditional Chinese festivals concern basic areas such as beliefs,rites,language,symbols,diets and art,which are exhibited in the co-existent "festival tokens," "festival events," "festival messages," "festival symbols," "festival food" and "festival art forms." Festivals feature fixed and periodic occurrence and multi-channel cultural inheritance.
文摘The "Twenty-Four Solar Terms" is an integrated knowledge system and functional social practice initiated and developed by ancient Chinese. Appling to their daily lives and agricultural production, based on records of the periodic motions of the sun, this knowledge system echoes seasonal and climate changes, phenological variation and reflects the features of ancient agricultural activities. As a comprehensive demonstration of their lives and production, it is a phenomenal achievement thanks to the ancient Chinese people's experience and wisdom. The "Twenty-Four Solar Terms" is also a cultural phenomenon unique to China, geographic location, the Yellow River Basin being at a mid-latitude zone with distinctive seasonal climate changes; its long-existing agrarian tradition, advanced agricultural philosophy and a harmonious lifestyle. In the meantime, while China's superior knowledge on astronomy made its formation technically possible, the "agriculture first" governmental policy and the "prefectures and counties" administrative system, introduced by governors from Qin and Han Dynasties, cultivated its formation institutionally. Besides, the "Twenty-Four Solar Terms" is the outcome of the harmonious civilization progress and traditional Chinese culture, which is different from Western Europe's aggressive and predatory industrial expansion. The "Twenty-Four Solar Terms" is still of great cultural and practical significance in China even today. It highlights the "unity of mankind and nature" philosophy and serves as another signature symbol of the Chinese culture. While China is more and more engaging in international affairs, the "Twenty-Four Solar Terms" facilitates the rest of the world to understand China from another angle.
基金This paper is funded by Luoxia Hong Research Center Project 2019,the Education Department of Sichu an Province(Project No.:LXHYJB1901).
文摘Up to now,there are few academic studies on the great astronomer,Luoxia Hong and the English translation of the 24 Solar Terms.Through the study of Luoxia Hong and the 24 Solar Terms and their English translations,this paper aims to,firstly,further reconfirm the historical status of Luoxia Hong and secondly,make a comparative study of the different translation versions of 24 Solar Terms from the perspective of translation studies,so that more people,home and abroad,can get more familiar with the historical and cultural celebrity Luoxia Hong and traditional Chinese culture.
文摘In the current era of rapid development, excellent culture needs to be inherited and spread to the world. Therefore, it is essential to consider the translation of the 24 solar terms. China persists in the principle of the Belt and Road Initiative, adheres to the guidance of Chinese traditional excellent culture goes global, and enhances the influence of Chinese culture on the words, the culture of the words communicating and developing constantly. This paper analyzes and compares translations of different versions, explores the necessity of translation strategies for translation, then summaries the translation strategy, ultimately figures out the development space, ted texts and promote the exchange of Chinese and foreign cultures.
文摘This book is the compendium of Chinese meteorologist Song Yingjie's research on the 24 solar terms.It encompasses the author's years of accumulated research,data,and cultural knowledge.From a meteorological perspective,this book applies charts based on climate big data,combined with literary writing techniques and meteorological algorithms,to present the knowledge of the twenty-four solar terms to readers.
基金supported by the National Natural Science Foundation of China(Grant No.61361136001)
文摘In the traditional Chinese Medicine(TCM), the timing of performing the treatment during the year is always an important factor for maximizing its effectiveness. Based on over half a century of observational and reanalysis data, a modified calendric system, named the Twenty-four Medical Terms(24-MTs), has been established for China's Mainland following a systematic calibration and geographical adjustment of the classic Twenty-four Solar Terms(24-STs). In view of "adapting the human body to the changing universe", a core philosophy of the TCM, this improved medical calendar is expected to make a significant contribution to the development of precise Chinese Medicine in the big data era. Specifically, two maps of localized timings for the so-called Triple-Fu(TF) and Triple-Jiu(TF) defined using a joint heat index of air temperature and relative humidity are created as an alternative to the two nationwide unified timings representing the warmest and coldest periods of the year. These location-specific medical calendars, with a maximum regional time shift of one week for TJ and a systematic advancing of 3.6–28.2 days for TF in China's Mainland, are thought to be clinically useful for carrying out precise TCM such as"treating winter deceases in summer". In addition, similar maps of localized timings for peak spring and peak autumn defined as the days of fastest warming and cooling around the years are generated for China's Mainland, so as to provide a helpful guidance for practicing season(ST/MT) related and geographically dependent precise health care in the context of "born in spring, grow in summer, harvest in autumn, and preserve in winter", which is a key ideology in the TCM.
基金supported by the National Natural Science Foundation of China (Grant No. 61361136001)
文摘The story of the Twenty-four Solar Terms(24-ST_s) is one of the most popular elements in Chinese culture, which has a profound influence on agriculture production, health care, and even daily life in both ancient and modern China. This traditional calendric system was invented by the Chinese ancestors through combining fundamental astronomical knowledge with climatic and phenological conditions in the Yellow River Basin some 2000 years ago. Although the basic philosophy of the 24-ST_s remains valid for the country as a whole to date, their regional robustness has been increasingly challenged by accumulating observational data in terms of temporal shift and spatial inhomogeneity. To tackle these issues, we propose to recalibrate the medically related critical timings of Great Heat and Great Cold in the classic ST system by using big meteorological data, and adjust them by introducing geographically correlated analytical models. As a result, a novel calendric system, called the Twenty-four Medical Terms(24-MT_s), has been developed as an upgraded version of the traditional 24-ST_s. The proposed 24-MT_s are characterized by two striking features with respect to the 24-ST_s: A varying duration of each MT instead of a fixed one for the ST, and a geographically dependent timing for each MT instead of a unified one for the entire nation. As such, the updated 24-MT_s are expected to provide a more realistic estimate of these critical timings around the year, and hence, a more precise guidance to agronomic planning and health care activity in China.
文摘This study focuses on the perspective of solar terms marketing to explore how Chinese culture empowers the transformation of the Liaoning Sea Cucumber marketing model.By exploring the cultural and social values of the twenty-four solar terms,the paper reveals the potential role of this traditional element in modern marketing.Furthermore,this paper examines traditional industries,especially the challenges and opportunities of the sea cucumber industry,which is primarily based on offline sales,in digital transformation.Taking Liaoning Sea Cucumber as an example,it discusses how to leverage online marketing strategies,such as targeting the high-end market,catering to the trend of youthful consumption,and innovating industry models,to assist the industry in achieving digital upgrades in intense market competition.This not only provides practical references and strategic insights for the sea cucumber industry but also for the transformation of other traditional industries in the modern consumer environment.
基金supported by the National Basic Research Program of China (2011CB952000 and 2009CB421401)the "Strategic Priority Research Program" of the Chinese Academy of Sciences (XDA05090100)the National Natural Science Foundation of China (41005039 and 40810059003)
文摘The temperature thresholds and timings of the 24 climatic Solar Terms in China are determined from a homogenized dataset of the surface air temperature recorded at 549 meteorological stations for the period 1960-2008 employing the ensemble empirical mode decomposition method.Changes in the mean temperature and timing of the climatic solar terms are illustrated.The results show that in terms of the mean situation over China,the number of cold days such as those of Slight Cold and Great Cold has decreased,especially by 56.8% for Great Cold in the last 10 years(1998-2007) compared with in the 1960s.The number of hot days like those of Great Heat has increased by 81.4% in the last 10 years compared with in the 1960s.The timings of the climatic Solar Terms during the warming period(around spring) in the seasonal cycle have advanced significantly by more than 6 d,especially by 15 d for Rain Water,while those during the cooling period(around autumn) have delayed significantly by 5-6 d.These characteristics are mainly due to a warming shift of the whole seasonal cycle under global warming.However,the warming shift affects the different Solar Terms to various extents,more prominently in the spring than in the autumn.The warming tendencies for Rain Water,the Beginning of Spring,and the Waking of Insects are the largest,2.43?C,2.37?C,and 2.21?C,respectively,for the period 1961-2007 in China as a whole.Four particular phenology-related climatic Solar Terms,namely the Waking of Insects,Pure Brightness,Grain Full,and Grain in Ear,are found to have advanced almost everywhere.In semi-arid zones in northern China,advances of the timings of these four climatic Solar Terms are significant,12-16,4-8,4-8,and 8-12 d,respectively,for the period 1961-2007.These quantitative results provide a scientific base for climate change adaptation,especially in terms of agricultural planning and energy-saving management throughout a year.
文摘Calendar is an important driving factor of electricity demand. Therefore, many load forecasting models would incorporate calendar information. Frequently used calendar variables include hours of a day, days of a week,months of a year, and so forth. During the past several decades, a widely-used calendar in load forecasting is the Gregorian calendar from the ancient Rome, which dissects a year into 12 months based on the Moon's orbit around the Earth. The applications of alternative calendars have rarely been reported in the load forecasting literature. This paper aims at discovering better means than Gregorian calendar to categorize days of a year for load forecasting.One alternative is the solar-term calendar, which divides the days of a year into 24 terms based on the Sun's position in the zodiac. It was originally from the ancient China to guide people for their agriculture activities. This paper proposes a novel method to model the seasonal change for load forecasting by incorporating the 24 solar terms in regression analysis. The case study is conducted for the eight load zones and the system total of ISO New England.Results from both cross-validation and sliding simulationshow that the forecast based on the 24 solar terms is more accurate than its counterpart based on the Gregorian calendar.
文摘In recent years, introduction of a renewable energy source such as solar energy is expected. However, solar radiation is not constant and power output of photovoltaic (PV) system is influenced by weather conditions. It is difficult for getting to know accurate power output of PV system. In order to forecast the power output of PV system as accurate as possible, this paper proposes a decision technique of forecasting model for short-term-ahead power output of PV system based on solar radiation prediction. Application of Recurrent Neural Network (RNN) is shown for solar radiation prediction in this paper. The proposed method in this paper does not require complicated calculation, but mathematical model with only useful weather data. The validity of the proposed RNN is confirmed by comparing simulation results of solar radiation forecasting with that obtained from other
文摘In this study, atmospheric visibility (AV) data from Riyadh, Saudi Arabia (24.91<span style="white-space:nowrap;">˚</span>N, 46.41<span style="white-space:nowrap;">˚</span>E, 760 m), for the period 1976-2011 were utilized to investigate the interannual, monthly, and seasonal AV variations and trends. The magnitudes of these trends were characterized and tested using mann-kendall (MK) rank statistics at different significance levels. No significant trend in AV was observed during the 36-year period. However, a significant increase in the annual mean AV by 0.24 km per year for the period between 1976 and 1999 was found. For the period 1999-2011, AV decreased significantly by 0.16 km per year. The potential effects of air temperature and relative humidity on AV were investigated. While these two variables could explain the observed trend of AV over some periods, they failed to do so for the whole study period. To search for extraterrestrial causes for long-term AV variations, correlation analyses between the time series of cosmic ray (CR) data (measured by NM and muon detector) and solar activity (represented by sunspot number) and AV were conducted and showed that these two variables are able to explain the AV variations for the whole study period. Additionally, power spectra analyses were conducted to investigate periodicities in the AV time series. Several significant periodicities, such as 9.8, 5.2, 2.2, 1.7, and 1.3 years were recognized. The obtained periodicities were similar to those reported by several investigators and found in solar, interplanetary, and CR parameters. The spectral and correlation results suggested that, with the expected effects of terrestrial and meteorological conditions on AV, long-term AV variations can also be related to the solar activity and associated CR modulations.
