Venusian coronae are large(60-2600 km diameter)tectono-magmatic features characterized by quasi-circular graben-fissure systems and topographic features such as a central dome,central depression,circular rim or circular
Frequencies of frequency standards are shifted by the local static gravity red shifts and also modulated by the tidal relativistic red shifts. We compute the tidal relativistic red shifts using a time-domain method an...Frequencies of frequency standards are shifted by the local static gravity red shifts and also modulated by the tidal relativistic red shifts. We compute the tidal relativistic red shifts using a time-domain method and present the numerical results for the National Institute of Metrology （NIM） in Beijing, Laboratoire National de Metrologie et Essais-Systeme de References Temps-Espaee （LNE-SYRTE） in Paris and Physikalisch-Teehnische Bundesanstalt （PTB） in Braunschweig. The differences of the tidal relativistic red shift approach as large as 1.1 × 10^-16 when frequency standards at NIM are compared with those at SYRTE and PTB. Moreover, the tidal relativistic red shifts of frequency standards in space stations are also computed.展开更多
The authors have proposed a new of magnetic isotope theory of life on Earth. According to this theory the initial impetus for the beginning of the synthesis of organic compounds is the impact of electromagnetic radiat...The authors have proposed a new of magnetic isotope theory of life on Earth. According to this theory the initial impetus for the beginning of the synthesis of organic compounds is the impact of electromagnetic radiation from the sun and energy radioactive isotopes.展开更多
The surface of Venus features a large number(>500)of quasi-circular tectono-magmatic features known as coronae.Coronae are characterized in part by their topographic characteristics,which can be diverse and
HANGZHOU, known as"paradise on earth," has ahumid climate, fresh air,a clean, well-orderedenvironment, and the West Lakeas its back garden. The landaround Hangzhou City is one
The buildup of oxygen in the Earth＇s atmosphere and oceans has fundamentally reshaped the dynamics of nearly all major biogeochemical cycles and ultimately paved the way for the diversification of complex life on Ear...The buildup of oxygen in the Earth＇s atmosphere and oceans has fundamentally reshaped the dynamics of nearly all major biogeochemical cycles and ultimately paved the way for the diversification of complex life on Earth. Over the past decades there have been sustained efforts to develop a more comprehensive understanding of ocean-atmosphere redox evolution and its relationship to the evolution of early life （Fig. 1）. It is generally accepted that the development of oxygenic photosynthesis at ~2.7 Ga may have been responsible for the Great Oxidation Event （GOE） at the beginning of the Proterozoic Eon, whereas a second big O2 rise at the end of the Proterozoic Eon （the so-called Neoproterozoic Oxidation Event or NOE） was responsible for the diversification of metazoans （Lyons et al., 2014）.展开更多
本文的标题有“耸人听闻”的味道,然而,读罢全文,又觉得文章不无道理。文中一个新名词environmental refugees,是否可译“环境难民”?environmental refugees的人数正在增加。其主要原因有二:widespreadmalnutrition(营养不良)and the u...本文的标题有“耸人听闻”的味道,然而,读罢全文,又觉得文章不无道理。文中一个新名词environmental refugees,是否可译“环境难民”?environmental refugees的人数正在增加。其主要原因有二:widespreadmalnutrition(营养不良)and the unprecedented increase in air,water and soilpollutants!文章的另一个观点也具有一定的思想深度:Without internationalcooperation,the researchers predicted"disease prevalence will continue its rapidrise throughout the world and will diminish the quality of life for all humans."这句话让我们想起了美国肯尼迪总统的一句名言:United,there is little wecannot do in a host of co-operative venture.Divided, there is little we can do,for we dare not meet a powerful challenge at odds and split asunder.细心的读者也许已经发现,文章多次提到climate change,这是我们以后考虑地球生存环境时一个不得不考虑的重要因素。国人曾经深受其害的血吸虫病并未在地球上灭绝。schistosomiasis(血吸虫病)causes an estimated 1 million deaths annually 一句又让我们想起了“万户萧疏鬼唱歌”的可怕情景！英语词汇讲究“搭配”。文章有几处非常地道的搭配。展开更多
【选注者言:贵刊去年第4期曾经刊登一文(Australian Scientists Find NewEvidence of Early Life)该文认为:通过对海底化石的研究,科学家们把生命在地球上出现的时间前移了27亿年。更吸引人的是,生命竟然诞生在沸水里！确 实,地球上最...【选注者言:贵刊去年第4期曾经刊登一文(Australian Scientists Find NewEvidence of Early Life)该文认为:通过对海底化石的研究,科学家们把生命在地球上出现的时间前移了27亿年。更吸引人的是,生命竟然诞生在沸水里！确 实,地球上最早的生命的起源问题是一个长期困扰生物学家的问题。现在,一项项新的发现刷“旧”了我们先前所知的生命出现的年代。最新的研究表明:地球最早的生命源于淡水池塘！】展开更多
With the cultural myth that science can only determine the way the world ＂is＂ （facts）, while humanities, social sciences, lawyers, philosophers, and theologians must determine the way the world ＂ought to be＂ （v...With the cultural myth that science can only determine the way the world ＂is＂ （facts）, while humanities, social sciences, lawyers, philosophers, and theologians must determine the way the world ＂ought to be＂ （values）, those in position of global-, national-, and local-political power make major decisions of the use （or non-use） of scientific knowledge and technology. As a result, the human being has created a non-scientifically based cultural environment that is affecting his ability to survive. In effect, cultural evolution is occurring more rapidly than biological evolution that can adapt to the changes brought about in the physical and psycho-social environments. In a pluralistic cultural world, where each society has generated a different view of human nature and different ethical values, the use, misuse, or non-use of scientific and technological advances are derived from these unscientific views of human nature. Since all life depends on limiting interacting environmental and ecological factors, it is imperative that scientific information be used to govern how to minimize irreversible effects on life-sustaining ecological factors, but also scientific information bearing on understanding human nature ought to be integrated into a ＂global bioethics＂. While ethical values cannot be directly derived from scientific factors, it is also true that human values or our ＂ought＂ cannot be maintained in ignorance or defiance of the facts or the ＂is＂.展开更多
The main types of defect in the (Tb_(0.3)Dy_(0.7))Fe_(1.95) alloys with the 'one-step' directional solidification process were investigated. The effect of the dendrite, grain boundaries, twin boundaries, and R...The main types of defect in the (Tb_(0.3)Dy_(0.7))Fe_(1.95) alloys with the 'one-step' directional solidification process were investigated. The effect of the dendrite, grain boundaries, twin boundaries, and REFe_3 precipitates on the magnetostrictive response of the (Tb_(0.3)Dy_(0.7))Fe_(1.95) alloys was analyzed respectively. The experiment results demonstrate that the dendrite, twin boundaries, and REFe_3 precipitates can be avoided by modifying alloying ingredient, solidification parameters and annealing technique. The dendritic growth front often leads to dendrite sheet, rare earth-rich phase, and twin boundaries. The lower proportion of rare earth, or slow solidification rate, results in the occurrence of REFe_3 precipitatates. It is vital for diminishing the defects to control the undercooling of solid-liquid interface at (2.4～5.1)×10~4 K·s·cm^(-2) so that the crystal grows in cellular growth front.展开更多
A new cerium polyoxomolybdate { [Ce （ H2 O） 7 Al （ OH ） 6 Mo6 O18 ] · 4H20 } （ compound 1 ） was synthesized and characterized by X-ray diffraction analysis, elemental analysis, TG analysis and IR spectromet...A new cerium polyoxomolybdate { [Ce （ H2 O） 7 Al （ OH ） 6 Mo6 O18 ] · 4H20 } （ compound 1 ） was synthesized and characterized by X-ray diffraction analysis, elemental analysis, TG analysis and IR spectrometry. Compound 1 exhibits a zigzag chain-like structure, which is constructed from an Anderson type anion and rare earth metal, Ce（ Ⅲ ）. These 1-D chains are further extended into a 3-D network by the aid of muhipoint hydrogen-bonding interactions.展开更多
文摘Venusian coronae are large(60-2600 km diameter)tectono-magmatic features characterized by quasi-circular graben-fissure systems and topographic features such as a central dome,central depression,circular rim or circular
基金Supported by the National Key R&D Program of China under Grant No 2016YFF0200200
文摘Frequencies of frequency standards are shifted by the local static gravity red shifts and also modulated by the tidal relativistic red shifts. We compute the tidal relativistic red shifts using a time-domain method and present the numerical results for the National Institute of Metrology （NIM） in Beijing, Laboratoire National de Metrologie et Essais-Systeme de References Temps-Espaee （LNE-SYRTE） in Paris and Physikalisch-Teehnische Bundesanstalt （PTB） in Braunschweig. The differences of the tidal relativistic red shift approach as large as 1.1 × 10^-16 when frequency standards at NIM are compared with those at SYRTE and PTB. Moreover, the tidal relativistic red shifts of frequency standards in space stations are also computed.
文摘The authors have proposed a new of magnetic isotope theory of life on Earth. According to this theory the initial impetus for the beginning of the synthesis of organic compounds is the impact of electromagnetic radiation from the sun and energy radioactive isotopes.
文摘The surface of Venus features a large number(>500)of quasi-circular tectono-magmatic features known as coronae.Coronae are characterized in part by their topographic characteristics,which can be diverse and
文摘HANGZHOU, known as"paradise on earth," has ahumid climate, fresh air,a clean, well-orderedenvironment, and the West Lakeas its back garden. The landaround Hangzhou City is one
文摘The buildup of oxygen in the Earth＇s atmosphere and oceans has fundamentally reshaped the dynamics of nearly all major biogeochemical cycles and ultimately paved the way for the diversification of complex life on Earth. Over the past decades there have been sustained efforts to develop a more comprehensive understanding of ocean-atmosphere redox evolution and its relationship to the evolution of early life （Fig. 1）. It is generally accepted that the development of oxygenic photosynthesis at ~2.7 Ga may have been responsible for the Great Oxidation Event （GOE） at the beginning of the Proterozoic Eon, whereas a second big O2 rise at the end of the Proterozoic Eon （the so-called Neoproterozoic Oxidation Event or NOE） was responsible for the diversification of metazoans （Lyons et al., 2014）.
文摘本文的标题有“耸人听闻”的味道,然而,读罢全文,又觉得文章不无道理。文中一个新名词environmental refugees,是否可译“环境难民”?environmental refugees的人数正在增加。其主要原因有二:widespreadmalnutrition(营养不良)and the unprecedented increase in air,water and soilpollutants!文章的另一个观点也具有一定的思想深度:Without internationalcooperation,the researchers predicted"disease prevalence will continue its rapidrise throughout the world and will diminish the quality of life for all humans."这句话让我们想起了美国肯尼迪总统的一句名言:United,there is little wecannot do in a host of co-operative venture.Divided, there is little we can do,for we dare not meet a powerful challenge at odds and split asunder.细心的读者也许已经发现,文章多次提到climate change,这是我们以后考虑地球生存环境时一个不得不考虑的重要因素。国人曾经深受其害的血吸虫病并未在地球上灭绝。schistosomiasis(血吸虫病)causes an estimated 1 million deaths annually 一句又让我们想起了“万户萧疏鬼唱歌”的可怕情景！英语词汇讲究“搭配”。文章有几处非常地道的搭配。
文摘【选注者言:贵刊去年第4期曾经刊登一文(Australian Scientists Find NewEvidence of Early Life)该文认为:通过对海底化石的研究,科学家们把生命在地球上出现的时间前移了27亿年。更吸引人的是,生命竟然诞生在沸水里！确 实,地球上最早的生命的起源问题是一个长期困扰生物学家的问题。现在,一项项新的发现刷“旧”了我们先前所知的生命出现的年代。最新的研究表明:地球最早的生命源于淡水池塘！】
文摘With the cultural myth that science can only determine the way the world ＂is＂ （facts）, while humanities, social sciences, lawyers, philosophers, and theologians must determine the way the world ＂ought to be＂ （values）, those in position of global-, national-, and local-political power make major decisions of the use （or non-use） of scientific knowledge and technology. As a result, the human being has created a non-scientifically based cultural environment that is affecting his ability to survive. In effect, cultural evolution is occurring more rapidly than biological evolution that can adapt to the changes brought about in the physical and psycho-social environments. In a pluralistic cultural world, where each society has generated a different view of human nature and different ethical values, the use, misuse, or non-use of scientific and technological advances are derived from these unscientific views of human nature. Since all life depends on limiting interacting environmental and ecological factors, it is imperative that scientific information be used to govern how to minimize irreversible effects on life-sustaining ecological factors, but also scientific information bearing on understanding human nature ought to be integrated into a ＂global bioethics＂. While ethical values cannot be directly derived from scientific factors, it is also true that human values or our ＂ought＂ cannot be maintained in ignorance or defiance of the facts or the ＂is＂.
文摘The main types of defect in the (Tb_(0.3)Dy_(0.7))Fe_(1.95) alloys with the 'one-step' directional solidification process were investigated. The effect of the dendrite, grain boundaries, twin boundaries, and REFe_3 precipitates on the magnetostrictive response of the (Tb_(0.3)Dy_(0.7))Fe_(1.95) alloys was analyzed respectively. The experiment results demonstrate that the dendrite, twin boundaries, and REFe_3 precipitates can be avoided by modifying alloying ingredient, solidification parameters and annealing technique. The dendritic growth front often leads to dendrite sheet, rare earth-rich phase, and twin boundaries. The lower proportion of rare earth, or slow solidification rate, results in the occurrence of REFe_3 precipitatates. It is vital for diminishing the defects to control the undercooling of solid-liquid interface at (2.4～5.1)×10~4 K·s·cm^(-2) so that the crystal grows in cellular growth front.
文摘A new cerium polyoxomolybdate { [Ce （ H2 O） 7 Al （ OH ） 6 Mo6 O18 ] · 4H20 } （ compound 1 ） was synthesized and characterized by X-ray diffraction analysis, elemental analysis, TG analysis and IR spectrometry. Compound 1 exhibits a zigzag chain-like structure, which is constructed from an Anderson type anion and rare earth metal, Ce（ Ⅲ ）. These 1-D chains are further extended into a 3-D network by the aid of muhipoint hydrogen-bonding interactions.
