To investigate the impact of dynamic assessment(DA)on the development of speaking skills,a case study was conducted,recruiting a non-English major undergraduate.DA was constructed following the design combining sandwi...To investigate the impact of dynamic assessment(DA)on the development of speaking skills,a case study was conducted,recruiting a non-English major undergraduate.DA was constructed following the design combining sandwich and cake format with an interactionist approach.To collect data,a profile was designed in accordance with the China’s Standards of English Language Ability(CSE)to record the learner’s changes.A semi-structured interview was conducted to reveal his perspectives on DA.The generated profile with specific mediator-learner’s moves revealed the learner’s microgenetic development in both organizational knowledge and oral expression strategy ability.The thematic analysis of the interview demonstrated the learner’s positive experience with DA,while also unveiling the weak points of DA.Finally,the operational framework for applying interactionist DA in the oral classroom was discussed,and the complementary relationship between DA and traditional teaching and testing practices was highlighted.展开更多
Flower petals have not only diverse macroscopic morphologies but are rich in microscopic surface patterns, which are crucial to their biological functions. Both experimental measurements and theoretical analysis are c...Flower petals have not only diverse macroscopic morphologies but are rich in microscopic surface patterns, which are crucial to their biological functions. Both experimental measurements and theoretical analysis are conducted to reveal the physical mechanisms underlying the formation of minute wrinkles on flower petals. Three representative flowers, daisy, kalanchoe blossfeldiana, and Eustoma grandiflorurn, are investigated as examples. A surface wrinkling model, incorporating the measured mechanical properties and growth ratio, is used to elucidate the difference in their surface morphologies. The mismatch between the anisotropic epidermal cell growth and the isotropic secretion of surficial wax is found to dictate the surface patterns.展开更多
Based on the case of WuXi App Tec,this paper explores the mechanism of private innovative enterprises to realize enterprise value growth through innovation-capital interaction in the framework of life growth cycle.Thi...Based on the case of WuXi App Tec,this paper explores the mechanism of private innovative enterprises to realize enterprise value growth through innovation-capital interaction in the framework of life growth cycle.This paper constructs a mechanism of interactive coexistence of innovation and capital,which has certain enlightenment and reference significance for innovative enterprises to realize technology catch-up and improve their independent innovation ability through capital operation.展开更多
This paper is devoted to a new class of differential games with continuous and dynamic updating.The direct application of resource extraction in a case of dynamic and continuous updating is considered.It is proved tha...This paper is devoted to a new class of differential games with continuous and dynamic updating.The direct application of resource extraction in a case of dynamic and continuous updating is considered.It is proved that the optimal control(cooperative strategies)and feedback Nash equilibrium strategies uniformly converge to the corresponding strategies in the game model with continuous updating as the number of updating instants converges to infinity.Similar results are presented for an optimal trajectory(cooperative trajectory),equilibrium trajectory and corresponding payoffs.展开更多
WOMEN of the Miao ethnic group in China love silver ornaments.In ancient times,the Miao people were always traveling rather than settling down.Legend has it that Miao people reforged their valuables by placing t...WOMEN of the Miao ethnic group in China love silver ornaments.In ancient times,the Miao people were always traveling rather than settling down.Legend has it that Miao people reforged their valuables by placing them into furnaces and crafting them into wearable accessories,enabling them to carry their assets with them when they traveled.This tradition continues to this day.The craftsmanship of silver ornaments by the Miao was rated as one of the representative items of national intangible cultural heritage in 2006.Miao people living in Fenghuang County of Hunan Province excel in this craftsmanship.展开更多
The influence of thermal treatment on the dielectric properties and energy storage performances of a classical dielectric nanocomposite system(barium titanate/polyvinylidene fluoride PVDF)was discussed systematically....The influence of thermal treatment on the dielectric properties and energy storage performances of a classical dielectric nanocomposite system(barium titanate/polyvinylidene fluoride PVDF)was discussed systematically.The results demonstrated that the permittivity of thermal treated nanocomposites increased and dielectric loss decreased compared with the untreated system.In addition,the energy density was also greatly improved due to the inclined residual polarization.For example,the energy density of the treated nanocomposite with 50 vol.%nanofillers was 3.14 times higher than the untreated nanocomposite at 50 MV/m.Moreover,the charge–discharge efficiency was also promoted from 6.36%to 56.89%.According to the viewpoint of microstructure,the improvement of the dielectric and energy storage properties would be ascribed to the suppression on void defects in the interphase of dielectric nanocomposite by employing the thermal treatment process.Finally,thermal treatment turns out to be a simple and an effective method to improve the dielectric performances and energy storage properties in the dielectric nanocomposites.展开更多
The Nature of Science(NOS)is an important component of scientific literacy.Science teachers'Views of the Nature of Science(VNOS)directly affect their teaching behaviors.Therefore,it is of great significance to exp...The Nature of Science(NOS)is an important component of scientific literacy.Science teachers'Views of the Nature of Science(VNOS)directly affect their teaching behaviors.Therefore,it is of great significance to explore science teachers'VNOs and find ways of improvement.展开更多
This paper is a subsequent work of[Invent.Math.,2013,191:197-253].The second fundamental theorem in Ahlfors covering surface theory is that,for each set E_(q)of q(≥3)distinct points in the extended complex plane C,th...This paper is a subsequent work of[Invent.Math.,2013,191:197-253].The second fundamental theorem in Ahlfors covering surface theory is that,for each set E_(q)of q(≥3)distinct points in the extended complex plane C,there is a minimal positive constant H_(0)(E_(q))(called Ahlfors constant with respect to E_(q)),such that the inequality(q-2)A(Σ)-4π#(f^(-1)(E_(q))∩U)≤H_(0)(E_(q))L(ЭΣ)holds for any simply-connected surfaceΣ=(f,U),where A(Σ)is the area ofΣ,L(ЭΣ)is the perimeter ofΣ,and#denotes the cardinality.It is difficult to compute H_(0)(E_(q))explicitly for general set E_(q),and only a few properties of H_(0)(E_(q))are known.The goals of this paper are to prove the continuity and differentiability of H_(0)(E_(q)),to estimate H_(0)(E_(q)),and to discuss the minimum of H_(0)(E_(q))for fixed q.展开更多
基金supported by the Project of Research on the Evaluation of the Cultivation of Language Talents for International Cultural Communication in Beijing(No.19JDYYB003),which is funded by Beijing Planning Office of Philosophy and Social Science。
文摘To investigate the impact of dynamic assessment(DA)on the development of speaking skills,a case study was conducted,recruiting a non-English major undergraduate.DA was constructed following the design combining sandwich and cake format with an interactionist approach.To collect data,a profile was designed in accordance with the China’s Standards of English Language Ability(CSE)to record the learner’s changes.A semi-structured interview was conducted to reveal his perspectives on DA.The generated profile with specific mediator-learner’s moves revealed the learner’s microgenetic development in both organizational knowledge and oral expression strategy ability.The thematic analysis of the interview demonstrated the learner’s positive experience with DA,while also unveiling the weak points of DA.Finally,the operational framework for applying interactionist DA in the oral classroom was discussed,and the complementary relationship between DA and traditional teaching and testing practices was highlighted.
基金Supports from the National Natural Science Foundation of China(11602027)the National Science Foundation for Post-doctoral Scientists of China(2016M600969)
文摘Flower petals have not only diverse macroscopic morphologies but are rich in microscopic surface patterns, which are crucial to their biological functions. Both experimental measurements and theoretical analysis are conducted to reveal the physical mechanisms underlying the formation of minute wrinkles on flower petals. Three representative flowers, daisy, kalanchoe blossfeldiana, and Eustoma grandiflorurn, are investigated as examples. A surface wrinkling model, incorporating the measured mechanical properties and growth ratio, is used to elucidate the difference in their surface morphologies. The mismatch between the anisotropic epidermal cell growth and the isotropic secretion of surficial wax is found to dictate the surface patterns.
基金One of the research results of national social science fund granted project(16BGL058)Guangdong Natural Science fund granted project(2018A030313103)+2 种基金Project approved by Guangdong University Student Innovation and Entrepreneurship Education Research Center,and funded by Guangdong University of Finance&Economics(2018A052459)2019 University Key Research Projects in Guangdong Province(2019WZDXM015)The Teaching Quality and Teaching Reform Project of University in Guangdong Province in 2019:Teaching Team Project“International Teaching Team for Accounting Major”.
文摘Based on the case of WuXi App Tec,this paper explores the mechanism of private innovative enterprises to realize enterprise value growth through innovation-capital interaction in the framework of life growth cycle.This paper constructs a mechanism of interactive coexistence of innovation and capital,which has certain enlightenment and reference significance for innovative enterprises to realize technology catch-up and improve their independent innovation ability through capital operation.
基金supported by Postdoctoral International Exchange Program of China,and corresponding author’work is also supported by the National Natural Science Foundation of China(No.72171126).
文摘This paper is devoted to a new class of differential games with continuous and dynamic updating.The direct application of resource extraction in a case of dynamic and continuous updating is considered.It is proved that the optimal control(cooperative strategies)and feedback Nash equilibrium strategies uniformly converge to the corresponding strategies in the game model with continuous updating as the number of updating instants converges to infinity.Similar results are presented for an optimal trajectory(cooperative trajectory),equilibrium trajectory and corresponding payoffs.
文摘WOMEN of the Miao ethnic group in China love silver ornaments.In ancient times,the Miao people were always traveling rather than settling down.Legend has it that Miao people reforged their valuables by placing them into furnaces and crafting them into wearable accessories,enabling them to carry their assets with them when they traveled.This tradition continues to this day.The craftsmanship of silver ornaments by the Miao was rated as one of the representative items of national intangible cultural heritage in 2006.Miao people living in Fenghuang County of Hunan Province excel in this craftsmanship.
基金supported by National Nature Science Foundation of China(Grant No.51622701)State Grid Corporation Technology Project(5202011600UK)and the Fundamental Research Funds for the Central Universities(No.FRF-TP-16-001C1).
文摘The influence of thermal treatment on the dielectric properties and energy storage performances of a classical dielectric nanocomposite system(barium titanate/polyvinylidene fluoride PVDF)was discussed systematically.The results demonstrated that the permittivity of thermal treated nanocomposites increased and dielectric loss decreased compared with the untreated system.In addition,the energy density was also greatly improved due to the inclined residual polarization.For example,the energy density of the treated nanocomposite with 50 vol.%nanofillers was 3.14 times higher than the untreated nanocomposite at 50 MV/m.Moreover,the charge–discharge efficiency was also promoted from 6.36%to 56.89%.According to the viewpoint of microstructure,the improvement of the dielectric and energy storage properties would be ascribed to the suppression on void defects in the interphase of dielectric nanocomposite by employing the thermal treatment process.Finally,thermal treatment turns out to be a simple and an effective method to improve the dielectric performances and energy storage properties in the dielectric nanocomposites.
基金The authors disclosed receipt of the following financial support for the research,authorship,and/or publication of this article:We gratefully acknowledge the Social Sciences and Humanities Research Council of Canada(SSHRC)for its financial support of Canada-China partnership grant program on reciprocal learning in teacher education and school education(No.895-2012-1011).
文摘The Nature of Science(NOS)is an important component of scientific literacy.Science teachers'Views of the Nature of Science(VNOS)directly affect their teaching behaviors.Therefore,it is of great significance to explore science teachers'VNOs and find ways of improvement.
基金the National Natural Science Foundation of China(Grant No.12071047).
文摘This paper is a subsequent work of[Invent.Math.,2013,191:197-253].The second fundamental theorem in Ahlfors covering surface theory is that,for each set E_(q)of q(≥3)distinct points in the extended complex plane C,there is a minimal positive constant H_(0)(E_(q))(called Ahlfors constant with respect to E_(q)),such that the inequality(q-2)A(Σ)-4π#(f^(-1)(E_(q))∩U)≤H_(0)(E_(q))L(ЭΣ)holds for any simply-connected surfaceΣ=(f,U),where A(Σ)is the area ofΣ,L(ЭΣ)is the perimeter ofΣ,and#denotes the cardinality.It is difficult to compute H_(0)(E_(q))explicitly for general set E_(q),and only a few properties of H_(0)(E_(q))are known.The goals of this paper are to prove the continuity and differentiability of H_(0)(E_(q)),to estimate H_(0)(E_(q)),and to discuss the minimum of H_(0)(E_(q))for fixed q.
