It has been suggested that text-based computer-mediated communication can help learners to use target language both in classrooms and in social contexts.It’s necessary to investigate the effect of text-based CMC on l...It has been suggested that text-based computer-mediated communication can help learners to use target language both in classrooms and in social contexts.It’s necessary to investigate the effect of text-based CMC on learners’communicative competence by conducting the method of systematic review.The findings implied that text-based CMC settings allowed learners to interact.The interaction provided learners with more opportunities to develop their communicative competence of target language.展开更多
The wide-precision planting pattern has become widely used in the North China Plain as a practice for increasing wheat yield.However,the effects of tilled ng developme nt and light tran smissi on within can opy on whe...The wide-precision planting pattern has become widely used in the North China Plain as a practice for increasing wheat yield.However,the effects of tilled ng developme nt and light tran smissi on within can opy on wheat yield un der differe nt sowi ng widths have not bee n clearly described.Therefore,a two-year experime nt was con ducted,in cludi ng four different seeding widths(6 cm,W6;8 cm,W8;10 cm,W10;12 cm,W12)and the traditional planting pattern with seeding width of 4 cm(W4).The results indicated mainly positive effects by the reduced intraspecific competition,specifically all three yield components of W6 and W8 were higher than those for W4.The configurations with more than 10-cm seeding width were mainly affected by the negative effect of a relative homogeneous canopy,leading to the weakened light transmission,leaf senescence,and reduced grain number per spike.Finally,the yields of W6 and W8 were significantly higher than that of W4,whereas the yield in W12 was lower(though not significantly)than W4.In wheat production,therefore,the appropriate seeding width of 6-8 cm is recommended for farmers,whereas the too wide seeding width,with more than 10 cm,should be avoided.展开更多
Improving listening and speaking competence,the two fundamental communicative skills,has become widely accepted as an important goal of English teaching in China.But due to the grammar-focused teaching method,students...Improving listening and speaking competence,the two fundamental communicative skills,has become widely accepted as an important goal of English teaching in China.But due to the grammar-focused teaching method,students still have great difficulties in listening and speaking.This essay intends to reveal the methods of using the lexical vantage to improve communicative abilities.展开更多
The establishment of China-ASEAN Free Trade Area has promoted the friendly bilateral economic cooperation,and ASEAN has become one of the largest vegetable export markets for China. Using constant market share( CMS) m...The establishment of China-ASEAN Free Trade Area has promoted the friendly bilateral economic cooperation,and ASEAN has become one of the largest vegetable export markets for China. Using constant market share( CMS) model,this paper analyzes the export competitiveness of vegetables from China to ASEAN and the main influencing factors. The results show that competitiveness is the main factor in promoting the export growth of vegetables from China to ASEAN,and compared with demand effect and structure effect,competitiveness effect makes the greatest contribution to export growth.展开更多
With the attendance of over 100 vips from Evonik andother companies,the ribbon of"Evonik Specialties RadiationCuring Competence Center Asia / Pacific" was cut in its openingceremony recently held in Shangh...With the attendance of over 100 vips from Evonik andother companies,the ribbon of"Evonik Specialties RadiationCuring Competence Center Asia / Pacific" was cut in its openingceremony recently held in Shanghai.This remarks an importantmilestone for Evonik to further develop its technicalcore competence of radiation curing silicone in the local marketand expand its foundational research in the region."This RC pilot will support Evonik to penetrate more展开更多
Compliments are great.Maybe someone does well on a test.Praise them for their good work.Say,"Good job!"or"I'm proud of you!"Someone may have a wonderful idea.Then you can say,"That’s a gr...Compliments are great.Maybe someone does well on a test.Praise them for their good work.Say,"Good job!"or"I'm proud of you!"Someone may have a wonderful idea.Then you can say,"That’s a great idea!"展开更多
Recognized as a pivotal facet in Beyond Fifth-Generation(B5G)and the upcoming Sixth-Generation(6G)wireless networks,Unmanned Aerial Vehicle(UAV)communications pose challenges due to limited capabilities when serving a...Recognized as a pivotal facet in Beyond Fifth-Generation(B5G)and the upcoming Sixth-Generation(6G)wireless networks,Unmanned Aerial Vehicle(UAV)communications pose challenges due to limited capabilities when serving as mobile base stations,leading to suboptimal service for edge users.To address this,the collaborative formation of Coordinated Multi-Point(CoMP)networks proves instrumental in alleviating the issue of the poor Quality of Service(QoS)at edge users in the network periphery.This paper introduces a groundbreaking solution,the Hybrid Uplink-Downlink Non-Orthogonal Multiple Access(HUD-NOMA)scheme for UAV-aided CoMP networks.Leveraging network coding and NOMA technology,our proposed HUD-NOMA effectively enhances transmission rates for edge users,notwithstanding a minor reduction in signal reception reliability for strong signals.Importantly,the system’s overall sum rate is elevated.The proposed HUD-NOMA demonstrates resilience against eavesdroppers by effectively managing intended interferences without the need for additional artificial noise injection.The study employs a stochastic geometry approach to derive the Secrecy Outage Probability(SOP)for the transmissions in the CoMP network,revealing superior performance in transmission rates and lower SOP compared to existing methods through numerical verification.Furthermore,guided by the theoretical SOP derivation,this paper proposes a power allocation strategy to further reduce the system’s SOP.展开更多
Teaching English as a foreign language is not tantamount to elaborating on syntactic structures or learning new vocabulary and expressions, but should incorporate some cultural elements which are intertwined with the ...Teaching English as a foreign language is not tantamount to elaborating on syntactic structures or learning new vocabulary and expressions, but should incorporate some cultural elements which are intertwined with the language itself. The main premise of the paper is that effective communication is more than a matter of linguistic proficiency and the learner's pragmatic competence is more or less arrested by the negative cultural transfer from the mother tongue, and based on that premise, the paper analyses the reasons behind negative cultural transfer from the lexical dimension, the speech act dimension, and the psychological dimension, and concludes with a tripartite toolkit of alleviating principles respectively corresponding to the classroom instruction, the teachers, and the students.展开更多
随着高速铁路的不断发展和列车速度的不断提高,高铁场景下车地通信的可靠性和高效性引起广泛关注。列车速度的提升导致更加频繁的越区切换,使系统的可靠性得不到保障,因此列车速度的提升对高铁通信网络的安全性和可靠性产生严重影响。...随着高速铁路的不断发展和列车速度的不断提高,高铁场景下车地通信的可靠性和高效性引起广泛关注。列车速度的提升导致更加频繁的越区切换,使系统的可靠性得不到保障,因此列车速度的提升对高铁通信网络的安全性和可靠性产生严重影响。本文提出1种将LTE-A(Long Term Evolution-Advanced)网络应用到高速铁路场景并基于协同多点传输/接收CoMP(Coordinated Multi-Point transmission/reception)技术的切换优化方案模型,方案参考协作集加入模型。对系统切换成功率等进行性能分析,并与传统切换方案进行性能对比。分析表明:本文基于CoMP的切换方案可有效提升高移动性下网络的切换成功概率,明显改善系统的可靠性和效率。展开更多
Influence of high light stress on the photosynthesis of flag leaves of indica subspecies (cv. “Shanyou 63', sensitive to photoinhibition) and japonica subspecies (cv. “Wuyujing', resistant to photoin...Influence of high light stress on the photosynthesis of flag leaves of indica subspecies (cv. “Shanyou 63', sensitive to photoinhibition) and japonica subspecies (cv. “Wuyujing', resistant to photoinhibition) of rice ( Oryza sativa L.) was comparatively investigated. In both cultivars of rice, the excitation energy distribution between two photosystems was altered and the excitation energy transfer from light harvesting chlorophyll protein complexes to PSⅡ was inhibited by high light stress. These decreases were more pronounced in indica rice cultivar as compared to japonica one. The analysis of mild SDS_PAGE showed that in indica rice, high light stress almost disaggregated the trimer of light harvesting chlorophyll protein complexes of PSⅡ (LHC Ⅱ 1). The stress reduced the contents of internal antennae chlorophyll protein complexes of PSⅡ (CPa), light harvesting chlorophyll protein of PSⅠ (CPⅠa) and Chl a protein complex of PSⅠ reaction center (CPⅠ) as well as dimer of LHCⅡ (LHCⅡ 2) in indica rice. In japonica subspecies, however, high light stress depressed the contents of LHCⅡ 1, CPa and CPⅠa, but slightly impacted on CPⅠ content. Moreover, the increase in the contents of monomer of LHCⅡ by high light stress was found in both subspecies. In consistent with above results, analysis of polypeptide indicated that the amounts of 27 kD and 25 kD polypeptide of LHCⅡ in particular, as well as that of 21 kD polypeptide of CPⅠa were reduced by high light stress in both subspecies. It was found that, comparing with japonica rice, the stress pronouncedly diminished 43 kD and 47 kD proteins of CPa and 23 kD extrisic protein in indica rice.展开更多
文摘It has been suggested that text-based computer-mediated communication can help learners to use target language both in classrooms and in social contexts.It’s necessary to investigate the effect of text-based CMC on learners’communicative competence by conducting the method of systematic review.The findings implied that text-based CMC settings allowed learners to interact.The interaction provided learners with more opportunities to develop their communicative competence of target language.
基金This work was supported by the Special Fund for Agroscientific Research in the Public Interest,China(201503130).
文摘The wide-precision planting pattern has become widely used in the North China Plain as a practice for increasing wheat yield.However,the effects of tilled ng developme nt and light tran smissi on within can opy on wheat yield un der differe nt sowi ng widths have not bee n clearly described.Therefore,a two-year experime nt was con ducted,in cludi ng four different seeding widths(6 cm,W6;8 cm,W8;10 cm,W10;12 cm,W12)and the traditional planting pattern with seeding width of 4 cm(W4).The results indicated mainly positive effects by the reduced intraspecific competition,specifically all three yield components of W6 and W8 were higher than those for W4.The configurations with more than 10-cm seeding width were mainly affected by the negative effect of a relative homogeneous canopy,leading to the weakened light transmission,leaf senescence,and reduced grain number per spike.Finally,the yields of W6 and W8 were significantly higher than that of W4,whereas the yield in W12 was lower(though not significantly)than W4.In wheat production,therefore,the appropriate seeding width of 6-8 cm is recommended for farmers,whereas the too wide seeding width,with more than 10 cm,should be avoided.
文摘Improving listening and speaking competence,the two fundamental communicative skills,has become widely accepted as an important goal of English teaching in China.But due to the grammar-focused teaching method,students still have great difficulties in listening and speaking.This essay intends to reveal the methods of using the lexical vantage to improve communicative abilities.
文摘The establishment of China-ASEAN Free Trade Area has promoted the friendly bilateral economic cooperation,and ASEAN has become one of the largest vegetable export markets for China. Using constant market share( CMS) model,this paper analyzes the export competitiveness of vegetables from China to ASEAN and the main influencing factors. The results show that competitiveness is the main factor in promoting the export growth of vegetables from China to ASEAN,and compared with demand effect and structure effect,competitiveness effect makes the greatest contribution to export growth.
文摘With the attendance of over 100 vips from Evonik andother companies,the ribbon of"Evonik Specialties RadiationCuring Competence Center Asia / Pacific" was cut in its openingceremony recently held in Shanghai.This remarks an importantmilestone for Evonik to further develop its technicalcore competence of radiation curing silicone in the local marketand expand its foundational research in the region."This RC pilot will support Evonik to penetrate more
文摘Compliments are great.Maybe someone does well on a test.Praise them for their good work.Say,"Good job!"or"I'm proud of you!"Someone may have a wonderful idea.Then you can say,"That’s a great idea!"
基金supported in part by the National Key R&D Program of China under Grant 2022YFB3104503in part by the National Natural Science Foundation of China under Grant 62202054,and Grant 61931001+2 种基金in part by the National Natural Science Foundation of China No.62202054the Young Elite Scientists Sponsorship Program of the China Association for Science and Technology under Grant 2023QNRC001in part by the U.S.National Science Foundation under Grant 2136202.
文摘Recognized as a pivotal facet in Beyond Fifth-Generation(B5G)and the upcoming Sixth-Generation(6G)wireless networks,Unmanned Aerial Vehicle(UAV)communications pose challenges due to limited capabilities when serving as mobile base stations,leading to suboptimal service for edge users.To address this,the collaborative formation of Coordinated Multi-Point(CoMP)networks proves instrumental in alleviating the issue of the poor Quality of Service(QoS)at edge users in the network periphery.This paper introduces a groundbreaking solution,the Hybrid Uplink-Downlink Non-Orthogonal Multiple Access(HUD-NOMA)scheme for UAV-aided CoMP networks.Leveraging network coding and NOMA technology,our proposed HUD-NOMA effectively enhances transmission rates for edge users,notwithstanding a minor reduction in signal reception reliability for strong signals.Importantly,the system’s overall sum rate is elevated.The proposed HUD-NOMA demonstrates resilience against eavesdroppers by effectively managing intended interferences without the need for additional artificial noise injection.The study employs a stochastic geometry approach to derive the Secrecy Outage Probability(SOP)for the transmissions in the CoMP network,revealing superior performance in transmission rates and lower SOP compared to existing methods through numerical verification.Furthermore,guided by the theoretical SOP derivation,this paper proposes a power allocation strategy to further reduce the system’s SOP.
文摘Teaching English as a foreign language is not tantamount to elaborating on syntactic structures or learning new vocabulary and expressions, but should incorporate some cultural elements which are intertwined with the language itself. The main premise of the paper is that effective communication is more than a matter of linguistic proficiency and the learner's pragmatic competence is more or less arrested by the negative cultural transfer from the mother tongue, and based on that premise, the paper analyses the reasons behind negative cultural transfer from the lexical dimension, the speech act dimension, and the psychological dimension, and concludes with a tripartite toolkit of alleviating principles respectively corresponding to the classroom instruction, the teachers, and the students.
文摘随着高速铁路的不断发展和列车速度的不断提高,高铁场景下车地通信的可靠性和高效性引起广泛关注。列车速度的提升导致更加频繁的越区切换,使系统的可靠性得不到保障,因此列车速度的提升对高铁通信网络的安全性和可靠性产生严重影响。本文提出1种将LTE-A(Long Term Evolution-Advanced)网络应用到高速铁路场景并基于协同多点传输/接收CoMP(Coordinated Multi-Point transmission/reception)技术的切换优化方案模型,方案参考协作集加入模型。对系统切换成功率等进行性能分析,并与传统切换方案进行性能对比。分析表明:本文基于CoMP的切换方案可有效提升高移动性下网络的切换成功概率,明显改善系统的可靠性和效率。
文摘Influence of high light stress on the photosynthesis of flag leaves of indica subspecies (cv. “Shanyou 63', sensitive to photoinhibition) and japonica subspecies (cv. “Wuyujing', resistant to photoinhibition) of rice ( Oryza sativa L.) was comparatively investigated. In both cultivars of rice, the excitation energy distribution between two photosystems was altered and the excitation energy transfer from light harvesting chlorophyll protein complexes to PSⅡ was inhibited by high light stress. These decreases were more pronounced in indica rice cultivar as compared to japonica one. The analysis of mild SDS_PAGE showed that in indica rice, high light stress almost disaggregated the trimer of light harvesting chlorophyll protein complexes of PSⅡ (LHC Ⅱ 1). The stress reduced the contents of internal antennae chlorophyll protein complexes of PSⅡ (CPa), light harvesting chlorophyll protein of PSⅠ (CPⅠa) and Chl a protein complex of PSⅠ reaction center (CPⅠ) as well as dimer of LHCⅡ (LHCⅡ 2) in indica rice. In japonica subspecies, however, high light stress depressed the contents of LHCⅡ 1, CPa and CPⅠa, but slightly impacted on CPⅠ content. Moreover, the increase in the contents of monomer of LHCⅡ by high light stress was found in both subspecies. In consistent with above results, analysis of polypeptide indicated that the amounts of 27 kD and 25 kD polypeptide of LHCⅡ in particular, as well as that of 21 kD polypeptide of CPⅠa were reduced by high light stress in both subspecies. It was found that, comparing with japonica rice, the stress pronouncedly diminished 43 kD and 47 kD proteins of CPa and 23 kD extrisic protein in indica rice.
