The environmental problems in the seriously polluted cities in China have been paid attention to by policy makers and foreign and domestic scholars. However, it is very difficult to improve the environmental quality ...The environmental problems in the seriously polluted cities in China have been paid attention to by policy makers and foreign and domestic scholars. However, it is very difficult to improve the environmental quality fundamentally due to its complexity, for example the formation of the seriously deteriorated environment. It is considered that the terminal harnessing is an important way,but the spread of high level terminal treatment is restricted by the limit of funds and technological level. Therefore, the way for a sustainable development of the seriously polluted cities should be multiple sided, which is to correlate the operation of environmental protection with the operation of city construction. To achieve an identity of these opposites, measures should be taken during economic development and environmental protection in every developing stage. In this paper, the authors take Benxi City as a case study.展开更多
Emergency endoscopy studies have shown that the most of seriously ill patients develop acute stress-related mucosal damage and ulceration within 24 hours of admission, which manifest the upper gastrointestinal
A shark expert known for unusual research methods and "pushing the envelope" in his study of the feared marine predator’s behavior was badly bitten by a shark in the Bahamas, colleagues said on Thursday. ...A shark expert known for unusual research methods and "pushing the envelope" in his study of the feared marine predator’s behavior was badly bitten by a shark in the Bahamas, colleagues said on Thursday. 一位鲨鱼专家不仅以超常的研究方式闻名,而且在研究可怕的海洋食肉动物时喜欢“豁出去”。星期二他的同事称。展开更多
AS with the continuous advancement of the low-carbon energy development, the wind power generation experiences fast growth with 441.3 GW installed capacity by Dec. 2023. The high penetration of renewable energy,togeth...AS with the continuous advancement of the low-carbon energy development, the wind power generation experiences fast growth with 441.3 GW installed capacity by Dec. 2023. The high penetration of renewable energy,together with high penetration of power electronic equipment (namely,“double high”),has been altering the steady-state and transient characteristics of wind power generation in a profound way,resulting in the different risk of instability.These stability issues will seriously affect the consumption of renewable energy and threaten the safe supply of electricity.Along with rapid deployment of wind power generation,together with the solar photovoltaic generation,it is expected to be over 1200 GW by 2030.展开更多
十期答案1. Explain the following words and expressions(highlighted in blue) in English.(1) feat, lamentably(Para. 2)a) feat: If you refer to an action, or the result of an action, as a feat, you admire it because it i...十期答案1. Explain the following words and expressions(highlighted in blue) in English.(1) feat, lamentably(Para. 2)a) feat: If you refer to an action, or the result of an action, as a feat, you admire it because it is an impressive and difficult achievement.b) lamentably: very unfortunately or disappointingly(2) farce(Para. 3)a) farce: If you describe a situation or on event as a farce, you mean that it is so disorganised or ridiculous that you cannot take it seriously.展开更多
Looking through any exercise science journals today,in fact any science journals including many top Science Citation Index(SCI) journals,one can easily find examples of the wide-spread "p【0.05/significance"...Looking through any exercise science journals today,in fact any science journals including many top Science Citation Index(SCI) journals,one can easily find examples of the wide-spread "p【0.05/significance" abuse phenomenon,i.e., if the p value from a statistical/hypothesis test is less than 0.05(or 0.01 sometimes),a conclusion that "the results/ findings are significant" is then drawn.The abuse is so severe that it is already seriously threatening the integrity of scientific inquiry.展开更多
The recent outbreak of COVID-19 has spread rapidly across the world.The pandemic has been seriously affecting public health and national and global economies since the beginning of 2020.By 3 November 2020,the world’s...The recent outbreak of COVID-19 has spread rapidly across the world.The pandemic has been seriously affecting public health and national and global economies since the beginning of 2020.By 3 November 2020,the world’s cumulative reported infections exceeded 46 million and the number of deaths reached 1.2 million(WHO 2020).The rapid spread of COVID-19 and its induced pandemic control through territory lockdown,travel bans and many other restrictions imposed on people’s movements have seriously affected the economy of all countries across the world.Worldwide,the pandemic has significantly affected food systems,particularly agricultural inputs and outputs markets,food processing and employment along food value chains,which has exacerbated poverty and food and nutrition insecurity.The latest FAO report on the State of Food Security and Nutrition in the World estimates that the COVID-19 pandemic could add 130 million people worldwide suffering from chronic hunger in 2020(FAO et al.2020).The pandemic is still serious and even worsening in some countries while it is currently under control in other countries.展开更多
Sexual matters between husband and wifeconcern directly the continuation of the humanrace and harmony of their family.The relationsbetween sexual life and health have been givenspecial attention in traditional medicin...Sexual matters between husband and wifeconcern directly the continuation of the humanrace and harmony of their family.The relationsbetween sexual life and health have been givenspecial attention in traditional medicine.Senileimpotence is a commonly encountered展开更多
Verticillium wilt is a global important disease ofcotton,which threatens the development ofcotton production seriously.Recent years,because of the change in climate and croppingpattern,Verticillium wilt was broke out ...Verticillium wilt is a global important disease ofcotton,which threatens the development ofcotton production seriously.Recent years,because of the change in climate and croppingpattern,Verticillium wilt was broke out incotton production areas in China,which展开更多
Returning biochar to soil is a heavily researched topic because biochar functions well for soil improvement. There is a significant loss of nutrients, which occurs during biochar preparation before biochar is returned...Returning biochar to soil is a heavily researched topic because biochar functions well for soil improvement. There is a significant loss of nutrients, which occurs during biochar preparation before biochar is returned to soil,thereby seriously undermining biochar＇s efficacy. Therefore, the transformation mechanisms of biochar p H,mass, nutrients and metals during pyrolysis under different atmospheres and temperatures were studied such that the best method for biochar preparation could be developed. Several conclusions can be reached：（1） a CO2 atmosphere is better than a N2 atmosphere for biochar preparation, although preparation in a CO2 atmosphere is not a common practice for biochar producers;（2） 350 ℃is the best temperature for biochar preparation because the amount of nutrient loss is notably low based on the premise of straw transferred into biochar; and（3） transforming mechanisms of pH, N, P and K are also involved in the biochar preparation process.展开更多
In limited feedback-based CloudRAN(C-RAN) systems,the inter-cluster and intra-cluster interference together with the quantification error can seriously deteriorates the system spectral efficiency.We,in this paper,prop...In limited feedback-based CloudRAN(C-RAN) systems,the inter-cluster and intra-cluster interference together with the quantification error can seriously deteriorates the system spectral efficiency.We,in this paper,propose an efficient three-phase framework and corresponding algorithms for dealing with this problem.Firstly,a greedy scheduling algorithm based on the lower bound of the ergodic rate is performed for generating an elementary cluster in the first phase.And then the elementary cluster is divided into many small clusters according to the following proposed algorithms based on the short term instantaneous information in the second phase.In the end,based on the limited feedback two zero-forcing(ZF) precoding strategies are adopted for reducing the intra-cluster interference in the third phase.The provided Monte Carlo simulations show the effectiveness of our proposed algorithms in the respect of system spectral efficiency and average user rate.展开更多
An ultra-wide and flat optical frequency comb(OFC) generation scheme using multiple continuous wave(CW) light sources based on electro-absorption modulator(EAM) and frequency modulator(FM) is proposed. In the scheme, ...An ultra-wide and flat optical frequency comb(OFC) generation scheme using multiple continuous wave(CW) light sources based on electro-absorption modulator(EAM) and frequency modulator(FM) is proposed. In the scheme, each CW light source is broadened and modulated by the first EAM and FM, respectively. The second EAM is introduced to flatten the ultra-wide OFC lines. By setting the wavelength spacing of light sources equal to the bandwidth of sub-OFC, an ultra-wide OFC can be obtained. Principle analysis and simulation for the scheme are performed. The results show that in the case of a single light source, a tunable and flat OFC is obtained. With the increase of light sources, the bandwidth of the generated ultra-wide OFC expands rapidly. In the case of 28 light sources, a 22 GHz ultra-wide OFC with bandwidth of 16.52 THz can be generated.展开更多
The precipitation behavior of topological close-packed（TCP）μphase in powder metallurgy（P/M）nickelbased superalloy FGH97 was investigated.The results showed that proper addition of solution strengthening elements,...The precipitation behavior of topological close-packed（TCP）μphase in powder metallurgy（P/M）nickelbased superalloy FGH97 was investigated.The results showed that proper addition of solution strengthening elements,such as Co,Cr,W,Mo,improved tensile strength,while excessive addition of those elements facilitated the precipitation ofμphase,which seriously aggravated the plasticity of the P/M superalloy.For the heat-treated specimens,the relationship between critical aging time（whenμstarted to precipitate）,aging temperature,and the average electron vacancy number ofγmatrix was established.展开更多
The development of satellitecommunications in China started inthe early 1970’s.Total five com-munications satellites have beensuccessfully launched into the geo-stationary orbit.The dual spin sta-bilization bus and C...The development of satellitecommunications in China started inthe early 1970’s.Total five com-munications satellites have beensuccessfully launched into the geo-stationary orbit.The dual spin sta-bilization bus and C band payloadare used for these satellites and twodifferent configurations are in-volved:the experimental communi-cations satellites STW-1 and STW-2,and the CHINASAT-1 domesticcommunications satellite.Nowthere are three domestic communi-cations satellites in orbit,whichhave worked normally up to now.展开更多
孩子是父母生命的延续、希望的寄托。道格拉斯·麦克阿瑟将军以一篇祈祷文道出了多少父母对子女品性的期待：坚强勇敢、志存高远、宽容简朴、谦虚幽默。Build me a son,Lord,who will be strong enough to know when he is weak,and...孩子是父母生命的延续、希望的寄托。道格拉斯·麦克阿瑟将军以一篇祈祷文道出了多少父母对子女品性的期待：坚强勇敢、志存高远、宽容简朴、谦虚幽默。Build me a son,Lord,who will be strong enough to know when he is weak,and brave enough to face himself when he is afraid;one who will be proud and unbending in honest defeat,and humble and gentle in victory.展开更多
The characteristics of two-phase flow and heat transfer in an internal thermosyphon boiling device withchannels of different geometrical shapes and dimensions including straight and helical channels have beeninvestiga...The characteristics of two-phase flow and heat transfer in an internal thermosyphon boiling device withchannels of different geometrical shapes and dimensions including straight and helical channels have beeninvestigated.The swirl-flow boiling device has more stable performance,higher heat transfer coefficientand higher rate of fouling removal than those of straight flow and has been successfully used in severalkinds of vaporizing equipment,such as reboiler,evaporator and closed thermosyphon.展开更多
ANSWER:“Tennis Elbow”is the com-mon name for epicondylitis of the humerus.It is caused by improper torsion of the fore-arm,damaging the origin of musculusextensor carpi.It may seem to be a minordisorder,but seriousl...ANSWER:“Tennis Elbow”is the com-mon name for epicondylitis of the humerus.It is caused by improper torsion of the fore-arm,damaging the origin of musculusextensor carpi.It may seem to be a minordisorder,but seriously affects movements ofthe arm and may become protracted with-out proper treatment.展开更多
文摘The environmental problems in the seriously polluted cities in China have been paid attention to by policy makers and foreign and domestic scholars. However, it is very difficult to improve the environmental quality fundamentally due to its complexity, for example the formation of the seriously deteriorated environment. It is considered that the terminal harnessing is an important way,but the spread of high level terminal treatment is restricted by the limit of funds and technological level. Therefore, the way for a sustainable development of the seriously polluted cities should be multiple sided, which is to correlate the operation of environmental protection with the operation of city construction. To achieve an identity of these opposites, measures should be taken during economic development and environmental protection in every developing stage. In this paper, the authors take Benxi City as a case study.
文摘Emergency endoscopy studies have shown that the most of seriously ill patients develop acute stress-related mucosal damage and ulceration within 24 hours of admission, which manifest the upper gastrointestinal
文摘A shark expert known for unusual research methods and "pushing the envelope" in his study of the feared marine predator’s behavior was badly bitten by a shark in the Bahamas, colleagues said on Thursday. 一位鲨鱼专家不仅以超常的研究方式闻名,而且在研究可怕的海洋食肉动物时喜欢“豁出去”。星期二他的同事称。
文摘AS with the continuous advancement of the low-carbon energy development, the wind power generation experiences fast growth with 441.3 GW installed capacity by Dec. 2023. The high penetration of renewable energy,together with high penetration of power electronic equipment (namely,“double high”),has been altering the steady-state and transient characteristics of wind power generation in a profound way,resulting in the different risk of instability.These stability issues will seriously affect the consumption of renewable energy and threaten the safe supply of electricity.Along with rapid deployment of wind power generation,together with the solar photovoltaic generation,it is expected to be over 1200 GW by 2030.
文摘十期答案1. Explain the following words and expressions(highlighted in blue) in English.(1) feat, lamentably(Para. 2)a) feat: If you refer to an action, or the result of an action, as a feat, you admire it because it is an impressive and difficult achievement.b) lamentably: very unfortunately or disappointingly(2) farce(Para. 3)a) farce: If you describe a situation or on event as a farce, you mean that it is so disorganised or ridiculous that you cannot take it seriously.
文摘Looking through any exercise science journals today,in fact any science journals including many top Science Citation Index(SCI) journals,one can easily find examples of the wide-spread "p【0.05/significance" abuse phenomenon,i.e., if the p value from a statistical/hypothesis test is less than 0.05(or 0.01 sometimes),a conclusion that "the results/ findings are significant" is then drawn.The abuse is so severe that it is already seriously threatening the integrity of scientific inquiry.
文摘The recent outbreak of COVID-19 has spread rapidly across the world.The pandemic has been seriously affecting public health and national and global economies since the beginning of 2020.By 3 November 2020,the world’s cumulative reported infections exceeded 46 million and the number of deaths reached 1.2 million(WHO 2020).The rapid spread of COVID-19 and its induced pandemic control through territory lockdown,travel bans and many other restrictions imposed on people’s movements have seriously affected the economy of all countries across the world.Worldwide,the pandemic has significantly affected food systems,particularly agricultural inputs and outputs markets,food processing and employment along food value chains,which has exacerbated poverty and food and nutrition insecurity.The latest FAO report on the State of Food Security and Nutrition in the World estimates that the COVID-19 pandemic could add 130 million people worldwide suffering from chronic hunger in 2020(FAO et al.2020).The pandemic is still serious and even worsening in some countries while it is currently under control in other countries.
文摘Sexual matters between husband and wifeconcern directly the continuation of the humanrace and harmony of their family.The relationsbetween sexual life and health have been givenspecial attention in traditional medicine.Senileimpotence is a commonly encountered
文摘Verticillium wilt is a global important disease ofcotton,which threatens the development ofcotton production seriously.Recent years,because of the change in climate and croppingpattern,Verticillium wilt was broke out incotton production areas in China,which
基金Supported by the National Natural Science Foundation of China(No.41571283)
文摘Returning biochar to soil is a heavily researched topic because biochar functions well for soil improvement. There is a significant loss of nutrients, which occurs during biochar preparation before biochar is returned to soil,thereby seriously undermining biochar＇s efficacy. Therefore, the transformation mechanisms of biochar p H,mass, nutrients and metals during pyrolysis under different atmospheres and temperatures were studied such that the best method for biochar preparation could be developed. Several conclusions can be reached：（1） a CO2 atmosphere is better than a N2 atmosphere for biochar preparation, although preparation in a CO2 atmosphere is not a common practice for biochar producers;（2） 350 ℃is the best temperature for biochar preparation because the amount of nutrient loss is notably low based on the premise of straw transferred into biochar; and（3） transforming mechanisms of pH, N, P and K are also involved in the biochar preparation process.
基金supported by the National Natural Science Foundation of China(NSFC) under Grant(No. 61461136001)
文摘In limited feedback-based CloudRAN(C-RAN) systems,the inter-cluster and intra-cluster interference together with the quantification error can seriously deteriorates the system spectral efficiency.We,in this paper,propose an efficient three-phase framework and corresponding algorithms for dealing with this problem.Firstly,a greedy scheduling algorithm based on the lower bound of the ergodic rate is performed for generating an elementary cluster in the first phase.And then the elementary cluster is divided into many small clusters according to the following proposed algorithms based on the short term instantaneous information in the second phase.In the end,based on the limited feedback two zero-forcing(ZF) precoding strategies are adopted for reducing the intra-cluster interference in the third phase.The provided Monte Carlo simulations show the effectiveness of our proposed algorithms in the respect of system spectral efficiency and average user rate.
基金supported by the Specialized Research Fund for the National Natural Science Foundation of China(Nos.61275067 and 61302026)the Provincial Natural Foundation of Jiangsu(Nos.BK2012830 and BK2012432)
文摘An ultra-wide and flat optical frequency comb(OFC) generation scheme using multiple continuous wave(CW) light sources based on electro-absorption modulator(EAM) and frequency modulator(FM) is proposed. In the scheme, each CW light source is broadened and modulated by the first EAM and FM, respectively. The second EAM is introduced to flatten the ultra-wide OFC lines. By setting the wavelength spacing of light sources equal to the bandwidth of sub-OFC, an ultra-wide OFC can be obtained. Principle analysis and simulation for the scheme are performed. The results show that in the case of a single light source, a tunable and flat OFC is obtained. With the increase of light sources, the bandwidth of the generated ultra-wide OFC expands rapidly. In the case of 28 light sources, a 22 GHz ultra-wide OFC with bandwidth of 16.52 THz can be generated.
基金Item Sponsored by International Science and Technology Cooperation Program of China(2014DFR50330)
文摘The precipitation behavior of topological close-packed（TCP）μphase in powder metallurgy（P/M）nickelbased superalloy FGH97 was investigated.The results showed that proper addition of solution strengthening elements,such as Co,Cr,W,Mo,improved tensile strength,while excessive addition of those elements facilitated the precipitation ofμphase,which seriously aggravated the plasticity of the P/M superalloy.For the heat-treated specimens,the relationship between critical aging time（whenμstarted to precipitate）,aging temperature,and the average electron vacancy number ofγmatrix was established.
文摘The development of satellitecommunications in China started inthe early 1970’s.Total five com-munications satellites have beensuccessfully launched into the geo-stationary orbit.The dual spin sta-bilization bus and C band payloadare used for these satellites and twodifferent configurations are in-volved:the experimental communi-cations satellites STW-1 and STW-2,and the CHINASAT-1 domesticcommunications satellite.Nowthere are three domestic communi-cations satellites in orbit,whichhave worked normally up to now.
文摘孩子是父母生命的延续、希望的寄托。道格拉斯·麦克阿瑟将军以一篇祈祷文道出了多少父母对子女品性的期待：坚强勇敢、志存高远、宽容简朴、谦虚幽默。Build me a son,Lord,who will be strong enough to know when he is weak,and brave enough to face himself when he is afraid;one who will be proud and unbending in honest defeat,and humble and gentle in victory.
文摘The characteristics of two-phase flow and heat transfer in an internal thermosyphon boiling device withchannels of different geometrical shapes and dimensions including straight and helical channels have beeninvestigated.The swirl-flow boiling device has more stable performance,higher heat transfer coefficientand higher rate of fouling removal than those of straight flow and has been successfully used in severalkinds of vaporizing equipment,such as reboiler,evaporator and closed thermosyphon.
文摘ANSWER:“Tennis Elbow”is the com-mon name for epicondylitis of the humerus.It is caused by improper torsion of the fore-arm,damaging the origin of musculusextensor carpi.It may seem to be a minordisorder,but seriously affects movements ofthe arm and may become protracted with-out proper treatment.
