A new hydrothermal field(Tianshi)was discovered on the rift valley wall through plume anomaly surveys and geological work conducted in 2012 and 2018 between 2°35′N and 2°43′N of the slow-spreading Carlsber...A new hydrothermal field(Tianshi)was discovered on the rift valley wall through plume anomaly surveys and geological work conducted in 2012 and 2018 between 2°35′N and 2°43′N of the slow-spreading Carlsberg Ridge(CR).Here,the results of two expeditions conducted to detect and characterize the new hydrothermal field are reported.Mineralogical and geochemical data,as well as 14 C ages of a sediment core collected near the field are presented to reveal the hydrothermal history.Results show that the Tianshi field is a basalt-hosted hydrothermal system.Geochemical data of the sediments collected near the field indicate a strong hydrothermal contribution,and hydrothermal Fe and Cu fluxes range from 30 to 155 mg/(cm^(2)·ka)and 0.59 to 11.49 mg/(cm^(2)·ka),respectively.Temporal variations in the fluxes of hydrothermal Fe indicate that there have been at least three amplified hydrothermal venting events(H 1,H 2,and H 3)in the Tianshi field over the last 35.2 ka,in 28.6-35.2 ka BP,22.0-27.6 ka BP,and 1.2-11.4 ka BP,respectively.Hydrothermal event H 2 was driven by an increased magmatic production associated with sea level fall during the Last Glacial Maximum,while event H 3 was promoted by tectonic activity associated with a rapid sea level rise.This study further verified the role of sea level change in modulating hydrothermal activity on mid-ocean ridges.展开更多
At the invitation of the Chinese Association for International Understanding(CAFIU),a delegation headed by Mr.Kurt Beck,President of FriedrichEbert-Stiftung(FES),visited China from 17 to 20,October 2013.As his first v...At the invitation of the Chinese Association for International Understanding(CAFIU),a delegation headed by Mr.Kurt Beck,President of FriedrichEbert-Stiftung(FES),visited China from 17 to 20,October 2013.As his first visit to China since taking the office of FES President,President Beck aimed at keeping abreast of China’s political,economic and social development since the 18th National Congress of the CPC as well as renewing the Memorandum of Understanding between CAFIU and FES.展开更多
In this paper, the nonlinear transient dynamic response of functionally graded material （FGM） sandwich doubly curved shell with homogenous isotropic material core and functionally graded face sheet is analyzed using...In this paper, the nonlinear transient dynamic response of functionally graded material （FGM） sandwich doubly curved shell with homogenous isotropic material core and functionally graded face sheet is analyzed using a new displacement field on the basis of Reddy＇s third-order shear theory for the first time. The equivalent material properties for the FGM face sheet are assumed to obey the rule of simple power law function in the thickness direction. Based on Reddy＇s theory of higher shear deformation, a new displacement field is developed by introducing the secant function into transverse displacement. Four coupled nonlinear differential equations are obtained by applying Hamilton＇s principle and Galerkin method. It is assumed that the FGM sandwich doubly curved shell is subjected to step loading, air-blast loading, triangular loading, and sinusoidal loading, respectively. On the basis of double-precision variable- coefficient ordinary differential equation solver, a new program code in FORTRAN software is developed to solve the nonlinear transient dynamics of the system. The influences of core thickness, volume fraction, core-to-face sheet thickness ratio, width-to-thickness ratio and blast type on the transient response of the shell are discussed in detail through numerical simulation.展开更多
We propose a new two-mode thermo-and squeezing-mixed optical field, described by the new density operator ρ=1-e^f-｜g｜^2 e^ga^＋b^＋e^fa^＋a｜0〉 f_（bb） 〈0｜ e^（g＊ab）, where ｜0〉_（bb） 〈0｜ is the b-mode va...We propose a new two-mode thermo-and squeezing-mixed optical field, described by the new density operator ρ=1-e^f-｜g｜^2 e^ga^＋b^＋e^fa^＋a｜0〉 f_（bb） 〈0｜ e^（g＊ab）, where ｜0〉_（bb） 〈0｜ is the b-mode vacuum, e ^fa^＋arepresents the thermo-field, and e^ga^＋b^＋ indicates squeezing. The photon statistics for ρ is studied by virtue of the method of integration within ordered product（IWOP） of operators. Such a field can be generated when a two-mode squeezed state passes through a one-mode dissipation channel.展开更多
Proton exchange membrane fuel cells(PEMFCs)are largely used in various applications because of their pollution-free products and high energy conversion efficiency.In order to improve the related design,in the present ...Proton exchange membrane fuel cells(PEMFCs)are largely used in various applications because of their pollution-free products and high energy conversion efficiency.In order to improve the related design,in the present work a new spiral flow field with a bypass is proposed.The reaction gas enters the flow field in the central path and diffuses in two directions through the flow channel and the bypass.The bypasses are arranged incrementally.The number of bypasses and the cross-section size of the bypasses are varied parametrically while a single-cell model of the PEMFC is used.The influence of the concentration of liquid water and oxygen in the cell on the performance of different flow fields is determined by means of Computational fluid dynamics(COMSOL Multiphysics software).Results show that when the bypass number is 48 and its cross-sectional area is 0.5 mm^(2),the cell exhibits the best performances.展开更多
You may still remember the story about the race between the big white rabbit and little tortoise, in which the over-proud rabbit lost. However, the White Rabbit toffees produced by the Shanghai Guansheng Yuan (Group) ...You may still remember the story about the race between the big white rabbit and little tortoise, in which the over-proud rabbit lost. However, the White Rabbit toffees produced by the Shanghai Guansheng Yuan (Group) Co., Ltd. are famous-brand products in China. This White Rabbit not only is the cham-展开更多
We studied a new grain-cash cropping pattern composed of "barley/watermelon + waize-rice", comparing with "barley / watermelon-rice" (CKI), "watermelon-rice", (CK2). The experiment was co...We studied a new grain-cash cropping pattern composed of "barley/watermelon + waize-rice", comparing with "barley / watermelon-rice" (CKI), "watermelon-rice", (CK2). The experiment was conducted in CNRRI’s field for 3 yr, employing completely randomized design with three replications, and each plot occupied 207 m~2. The soil in the experiment field contained: N, 2.48 g. kg, quick effective P 4 mg. kg, and quick effective K 53 mg·kg. The varieties tested were Zhemai 2 (barley), Zhemi 1 (watermelon), Suyu 1 (maize), and Shanyou 63 (hybrid rice).展开更多
According to the idea of class field theory, the possible absolutely normal number fieldsare restricted in nature by the arithmetical properties of rational number field .Becausethe fundamental arithmetical property o...According to the idea of class field theory, the possible absolutely normal number fieldsare restricted in nature by the arithmetical properties of rational number field .Becausethe fundamental arithmetical property of is the distributive law of the prime numbers,展开更多
As a novel material,liquid metal has attracted the attention of scientists for its unique properties and wide potential applications.In this paper,the basic concepts,properties,and behaviors of liquid metals under dif...As a novel material,liquid metal has attracted the attention of scientists for its unique properties and wide potential applications.In this paper,the basic concepts,properties,and behaviors of liquid metals under different conditions are introduced,and the latest advances in their synthesis methods and application felds are discussed.The development status of liquid metal in science and industry is also introduced.The latest research progress of liquid metals is systematically reviewed,and the potential and application prospect of liquid metals in materials science,engineering,and electronic techology are revealed.The research scope covers the wide application of liquid metals in nanotechnology,materials engineering,electronic technology,energy,and other fields,as well as the latest application cases of liquid metals in flexible electronic devices,sensors,catalysts,energy storage,and other fields.At the same time,the core disputes and problems to be solved in the field of liquid metals are discussed.Through the comments on liquid metals,we hope to provide reference and guidance for researchers and promote the further development in the field of liquid metals.This review would help stimulate more people's interest in liquid metals and encourage innovation and application development in this field.展开更多
The neritic carbonate reservoir of Middle Permian Maokou Formation in the Sichuan Basin has been always treated as a fractured and fractured-vuggy reservoir.After realizing the breakthrough of natural gas exploration ...The neritic carbonate reservoir of Middle Permian Maokou Formation in the Sichuan Basin has been always treated as a fractured and fractured-vuggy reservoir.After realizing the breakthrough of natural gas exploration in the Lower Cambrian Canglangpu Formation in the Taihe gas bearing area of central-northern Sichuan Basin,Well JT1,a wildcat well,recently discovers a beach facies porous dolomite reservoir in the Maokou Formation above the Canglangpu Formation,and the high-yield industrial gas flow of 112.8×10^(4)m^(3)/d is obtained during the test.And thus,Well JT1 achieves the breakthrough of tridimensional natural gas exploration in multiple gas bearing series of strata in the vertical direction and realizes the new discovery of reservoir type in the Maokou Formation.In order to further clarify the characteristics and control factors of the beach facies porous dolomite reservoir of Maokou Formation in the Taihe gas bearing area,this paper studied its sedimentary evolution,highenergy beach facies characteristics,reservoir characteristics and following natural gas exploration direction.And the following research results were obtained.First,along the syneclise margin of central-northern Sichuan Basin develops a beach facies porous reservoir of the second Member of Maokou Formation,whose lithology is dominated by residual dolarenite and calcsparite calcarenite and reservoir space is mainly acted by intergranular pores and intercrystalline pores,with the average porosity of 4.9%.Second,in the middle and late stage of Maokou period,Guangyuan-Bazhong paleo faulted depression was developed in the northern Sichuan Basin and intraplatform low was developed in the centralnorthern Sichuan Basin.In the central and the northern Sichuan Basin,the high-energy beach of Maokou Formation is distributed around the faulted depression and the syneclise margin in a large scale,and the paleogeographic pattern of“one-margin and three-high belt”is presented.Third,under the control of high-energy beach facies,the Maokou Formation porous reservoir in the central-northern Sichuan Basin is distributed along the“one-margin and three-high belt”in a large scale.The high-energy beach facies of“one-margin and three-high belt”covers the area of 6500 km^(2).In this area,multiple sets of source rocks(Cambrian,Silurian and Permian)are developed vertically,hydrocarbon source fault is developed and carrier system is good,which is favorable for the large-scale hydrocarbon enrichment and accumulation.In conclusion,there are geological conditions for the development of facies controlled porous reservoir in the Maokou Formation of the Sichuan Basin,and the“one-margin and three-high belt”is the favorable area for the exploration of beach facies porous dolomite reservoir.The research results point out the new exploration field and direction for the large-scale increase of natural gas reserves in the Sichuan Basin.展开更多
Mediated by the interactions with quantum vacuum fields,a probe laser field propagating in a nonlinear optical medium can generate new pair of light fields over a broad spectral range via spontaneous parametric proces...Mediated by the interactions with quantum vacuum fields,a probe laser field propagating in a nonlinear optical medium can generate new pair of light fields over a broad spectral range via spontaneous parametric process.Such process is inherently independent of the incident direction of light and reciprocal thus far,due to the directionindependent field-vacuum interactions.In this work,we experimentally demonstrate within sodium atomic vapors that such spontaneous parametric process can be nonreciprocal by unidirectionally coupling it to another pumped four-wave mixing process.Thanks to the broad bandwidth of the spontaneous parametric process,in combination with the Doppler and power-induced broadening of atomic energy levels,we achieve optical isolation with isolation ratio>25 dB over a bandwidth larger than 100 GHz.Considering that both spontaneous parametric processes and the pumped four-wave mixing have been realized in diverse solid photonic platforms,the demonstrated concept can motivate further explorations in the design of integrated magnetic-free broadband optical nonreciprocity via the interactions between nonlinear optical processes.展开更多
With the rapid development of China auto industry, the Chinese Government and the auto industry itself have given more and more attention to the upgrading self-R&D capacity of auto products. Ten years later, it is...With the rapid development of China auto industry, the Chinese Government and the auto industry itself have given more and more attention to the upgrading self-R&D capacity of auto products. Ten years later, it is predicted that the national economy and living standard will be improved greatly, and there will be a peak of the procurement展开更多
基金Supported by the National Natural Science Foundation of China(No.41976075)the National Key Research and Development Program of China(No.2021YFF0501302)+1 种基金the Fundamental Research Funds for National Non-profit Institute Grant(No.JG 2103)the China Ocean Mineral Resources R&D Association Project(No.DY135-S 2-1-03)。
文摘A new hydrothermal field(Tianshi)was discovered on the rift valley wall through plume anomaly surveys and geological work conducted in 2012 and 2018 between 2°35′N and 2°43′N of the slow-spreading Carlsberg Ridge(CR).Here,the results of two expeditions conducted to detect and characterize the new hydrothermal field are reported.Mineralogical and geochemical data,as well as 14 C ages of a sediment core collected near the field are presented to reveal the hydrothermal history.Results show that the Tianshi field is a basalt-hosted hydrothermal system.Geochemical data of the sediments collected near the field indicate a strong hydrothermal contribution,and hydrothermal Fe and Cu fluxes range from 30 to 155 mg/(cm^(2)·ka)and 0.59 to 11.49 mg/(cm^(2)·ka),respectively.Temporal variations in the fluxes of hydrothermal Fe indicate that there have been at least three amplified hydrothermal venting events(H 1,H 2,and H 3)in the Tianshi field over the last 35.2 ka,in 28.6-35.2 ka BP,22.0-27.6 ka BP,and 1.2-11.4 ka BP,respectively.Hydrothermal event H 2 was driven by an increased magmatic production associated with sea level fall during the Last Glacial Maximum,while event H 3 was promoted by tectonic activity associated with a rapid sea level rise.This study further verified the role of sea level change in modulating hydrothermal activity on mid-ocean ridges.
文摘At the invitation of the Chinese Association for International Understanding(CAFIU),a delegation headed by Mr.Kurt Beck,President of FriedrichEbert-Stiftung(FES),visited China from 17 to 20,October 2013.As his first visit to China since taking the office of FES President,President Beck aimed at keeping abreast of China’s political,economic and social development since the 18th National Congress of the CPC as well as renewing the Memorandum of Understanding between CAFIU and FES.
基金the support from the National Natural Science Foundation of China(NNSFC) through Grant No.11472056Beijing Key Laboratory Open Research Project KF20171123202
文摘In this paper, the nonlinear transient dynamic response of functionally graded material （FGM） sandwich doubly curved shell with homogenous isotropic material core and functionally graded face sheet is analyzed using a new displacement field on the basis of Reddy＇s third-order shear theory for the first time. The equivalent material properties for the FGM face sheet are assumed to obey the rule of simple power law function in the thickness direction. Based on Reddy＇s theory of higher shear deformation, a new displacement field is developed by introducing the secant function into transverse displacement. Four coupled nonlinear differential equations are obtained by applying Hamilton＇s principle and Galerkin method. It is assumed that the FGM sandwich doubly curved shell is subjected to step loading, air-blast loading, triangular loading, and sinusoidal loading, respectively. On the basis of double-precision variable- coefficient ordinary differential equation solver, a new program code in FORTRAN software is developed to solve the nonlinear transient dynamics of the system. The influences of core thickness, volume fraction, core-to-face sheet thickness ratio, width-to-thickness ratio and blast type on the transient response of the shell are discussed in detail through numerical simulation.
基金Project supported by the National Natural Science Foundation of China(Grant No.11574295)the Natural Science Foundation of Anhui Province,China(Grant No.1408085QA13)the Key project of Anhui Provincial Department of Education,China(Grant No.KJ2017A406)
文摘We propose a new two-mode thermo-and squeezing-mixed optical field, described by the new density operator ρ=1-e^f-｜g｜^2 e^ga^＋b^＋e^fa^＋a｜0〉 f_（bb） 〈0｜ e^（g＊ab）, where ｜0〉_（bb） 〈0｜ is the b-mode vacuum, e ^fa^＋arepresents the thermo-field, and e^ga^＋b^＋ indicates squeezing. The photon statistics for ρ is studied by virtue of the method of integration within ordered product（IWOP） of operators. Such a field can be generated when a two-mode squeezed state passes through a one-mode dissipation channel.
基金Thanks to Major Scientific and Technological Innovation Projects in Shandong Province(2018-CXGC0803)for the financial support of this article.
文摘Proton exchange membrane fuel cells(PEMFCs)are largely used in various applications because of their pollution-free products and high energy conversion efficiency.In order to improve the related design,in the present work a new spiral flow field with a bypass is proposed.The reaction gas enters the flow field in the central path and diffuses in two directions through the flow channel and the bypass.The bypasses are arranged incrementally.The number of bypasses and the cross-section size of the bypasses are varied parametrically while a single-cell model of the PEMFC is used.The influence of the concentration of liquid water and oxygen in the cell on the performance of different flow fields is determined by means of Computational fluid dynamics(COMSOL Multiphysics software).Results show that when the bypass number is 48 and its cross-sectional area is 0.5 mm^(2),the cell exhibits the best performances.
文摘You may still remember the story about the race between the big white rabbit and little tortoise, in which the over-proud rabbit lost. However, the White Rabbit toffees produced by the Shanghai Guansheng Yuan (Group) Co., Ltd. are famous-brand products in China. This White Rabbit not only is the cham-
文摘We studied a new grain-cash cropping pattern composed of "barley/watermelon + waize-rice", comparing with "barley / watermelon-rice" (CKI), "watermelon-rice", (CK2). The experiment was conducted in CNRRI’s field for 3 yr, employing completely randomized design with three replications, and each plot occupied 207 m~2. The soil in the experiment field contained: N, 2.48 g. kg, quick effective P 4 mg. kg, and quick effective K 53 mg·kg. The varieties tested were Zhemai 2 (barley), Zhemi 1 (watermelon), Suyu 1 (maize), and Shanyou 63 (hybrid rice).
文摘According to the idea of class field theory, the possible absolutely normal number fieldsare restricted in nature by the arithmetical properties of rational number field .Becausethe fundamental arithmetical property of is the distributive law of the prime numbers,
基金financially supported by Scientific Research Fund of Chongqing Municipal Education Commission[KJQN202201306]Major Cultivation Program of Chongqing University of Arts and Sciences[P2022HH06]Natural Science Foundation of Yongchuan District[2023yc-jckx20067].
文摘As a novel material,liquid metal has attracted the attention of scientists for its unique properties and wide potential applications.In this paper,the basic concepts,properties,and behaviors of liquid metals under different conditions are introduced,and the latest advances in their synthesis methods and application felds are discussed.The development status of liquid metal in science and industry is also introduced.The latest research progress of liquid metals is systematically reviewed,and the potential and application prospect of liquid metals in materials science,engineering,and electronic techology are revealed.The research scope covers the wide application of liquid metals in nanotechnology,materials engineering,electronic technology,energy,and other fields,as well as the latest application cases of liquid metals in flexible electronic devices,sensors,catalysts,energy storage,and other fields.At the same time,the core disputes and problems to be solved in the field of liquid metals are discussed.Through the comments on liquid metals,we hope to provide reference and guidance for researchers and promote the further development in the field of liquid metals.This review would help stimulate more people's interest in liquid metals and encourage innovation and application development in this field.
基金Project supported by National Major Science and Technology Project“Extensive hydrocarbon enrichment and target evaluation in PermianeMiddle Triassic in Sichuan Basin”(No.:2016ZX05007004)Major Science and Technology Project of PetroChina Company Limited“Research and application of key technologies for 30 billion cubic meters of gas productivity in Southwest Oil and Gas Field”(No.:2016E-06).
文摘The neritic carbonate reservoir of Middle Permian Maokou Formation in the Sichuan Basin has been always treated as a fractured and fractured-vuggy reservoir.After realizing the breakthrough of natural gas exploration in the Lower Cambrian Canglangpu Formation in the Taihe gas bearing area of central-northern Sichuan Basin,Well JT1,a wildcat well,recently discovers a beach facies porous dolomite reservoir in the Maokou Formation above the Canglangpu Formation,and the high-yield industrial gas flow of 112.8×10^(4)m^(3)/d is obtained during the test.And thus,Well JT1 achieves the breakthrough of tridimensional natural gas exploration in multiple gas bearing series of strata in the vertical direction and realizes the new discovery of reservoir type in the Maokou Formation.In order to further clarify the characteristics and control factors of the beach facies porous dolomite reservoir of Maokou Formation in the Taihe gas bearing area,this paper studied its sedimentary evolution,highenergy beach facies characteristics,reservoir characteristics and following natural gas exploration direction.And the following research results were obtained.First,along the syneclise margin of central-northern Sichuan Basin develops a beach facies porous reservoir of the second Member of Maokou Formation,whose lithology is dominated by residual dolarenite and calcsparite calcarenite and reservoir space is mainly acted by intergranular pores and intercrystalline pores,with the average porosity of 4.9%.Second,in the middle and late stage of Maokou period,Guangyuan-Bazhong paleo faulted depression was developed in the northern Sichuan Basin and intraplatform low was developed in the centralnorthern Sichuan Basin.In the central and the northern Sichuan Basin,the high-energy beach of Maokou Formation is distributed around the faulted depression and the syneclise margin in a large scale,and the paleogeographic pattern of“one-margin and three-high belt”is presented.Third,under the control of high-energy beach facies,the Maokou Formation porous reservoir in the central-northern Sichuan Basin is distributed along the“one-margin and three-high belt”in a large scale.The high-energy beach facies of“one-margin and three-high belt”covers the area of 6500 km^(2).In this area,multiple sets of source rocks(Cambrian,Silurian and Permian)are developed vertically,hydrocarbon source fault is developed and carrier system is good,which is favorable for the large-scale hydrocarbon enrichment and accumulation.In conclusion,there are geological conditions for the development of facies controlled porous reservoir in the Maokou Formation of the Sichuan Basin,and the“one-margin and three-high belt”is the favorable area for the exploration of beach facies porous dolomite reservoir.The research results point out the new exploration field and direction for the large-scale increase of natural gas reserves in the Sichuan Basin.
基金supported by National Natural Science Foundation of China(Grant Nos.62475209,62022066,12074306 and 92365107)the National Key R&D Program of China(Grant No.2019YFA0308700)+2 种基金Qinchuangyuan“Scientist+Engineer”Team Construction of Shaanxi Province(Grant No.2024QCY-KXJ-178)Key Scientific and Technological Innovation Team of Shaanxi Province(2021TD-56)the Program for Innovative Talents and Teams in Jiangsu(Grant No.JSSCTD202138).
文摘Mediated by the interactions with quantum vacuum fields,a probe laser field propagating in a nonlinear optical medium can generate new pair of light fields over a broad spectral range via spontaneous parametric process.Such process is inherently independent of the incident direction of light and reciprocal thus far,due to the directionindependent field-vacuum interactions.In this work,we experimentally demonstrate within sodium atomic vapors that such spontaneous parametric process can be nonreciprocal by unidirectionally coupling it to another pumped four-wave mixing process.Thanks to the broad bandwidth of the spontaneous parametric process,in combination with the Doppler and power-induced broadening of atomic energy levels,we achieve optical isolation with isolation ratio>25 dB over a bandwidth larger than 100 GHz.Considering that both spontaneous parametric processes and the pumped four-wave mixing have been realized in diverse solid photonic platforms,the demonstrated concept can motivate further explorations in the design of integrated magnetic-free broadband optical nonreciprocity via the interactions between nonlinear optical processes.
文摘With the rapid development of China auto industry, the Chinese Government and the auto industry itself have given more and more attention to the upgrading self-R&D capacity of auto products. Ten years later, it is predicted that the national economy and living standard will be improved greatly, and there will be a peak of the procurement
