For the purpose of identifying the stern of the SWATH （Small Waterplane Area Twin Hull） availably and perfecting the detection technique of the SWATH ship＇s performance, this paper presents a novel bidirectional im...For the purpose of identifying the stern of the SWATH （Small Waterplane Area Twin Hull） availably and perfecting the detection technique of the SWATH ship＇s performance, this paper presents a novel bidirectional image registration strategy and mosaicing technique based on the scale invariant feature transform （SIFT） algorithm. The proposed method can help us observe the stern with a great visual angle for analyzing the performance of the control fins of the SWATH. SIFT is one of the most effective local features of the scale, rotation and illumination invariant. However, there are a few false match rates in this algorithm. In terms of underwater machine vision, only by acquiring an accurate match rate can we find an underwater robot rapidly and identify the location of the object. Therefore, firstly, the selection of the match ratio principle is put forward in this paper; secondly, some advantages of the bidirectional registration algorithm are concluded by analyzing the characteristics of the unidirectional matching method. Finally, an automatic underwater image splicing method is proposed on the basis of fixed dimension, and then the edge of the image＇s overlapping section is merged by the principal components analysis algorithm. The experimental results achieve a better registration and smooth mosaicing effect, demonstrating that the proposed method is effective.展开更多
The emergence of Li–Mg hybrid batteries has been receiving attention,owing to their enhanced electrochemical kinetics and reduced overpotential.Nevertheless,the persistent challenge of uneven Mg electrodeposition rem...The emergence of Li–Mg hybrid batteries has been receiving attention,owing to their enhanced electrochemical kinetics and reduced overpotential.Nevertheless,the persistent challenge of uneven Mg electrodeposition remains a significant impediment to their practical integration.Herein,we developed an ingenious approach that centered around epitaxial electrocrystallization and meticulously controlled growth of magnesium crystals on a specialized MgMOF substrate.The chosen MgMOF substrate demonstrated a robust affinity for magnesium and showed minimal lattice misfit with Mg,establishing the crucial prerequisites for successful heteroepitaxial electrocrystallization.Moreover,the incorporation of periodic electric fields and successive nanochannels within the MgMOF structure created a spatially confined environment that considerably promoted uniform magnesium nucleation at the molecular scale.Taking inspiration from the“blockchain”concept prevalent in the realm of big data,we seamlessly integrated a conductive polypyrrole framework,acting as a connecting“chain,”to interlink the“blocks”comprising the MgMOF cavities.This innovative design significantly amplified charge‐transfer efficiency,thereby increasing overall electrochemical kinetics.The resulting architecture(MgMOF@PPy@CC)served as an exceptional host for heteroepitaxial Mg electrodeposition,showcasing remarkable electrostripping/plating kinetics and excellent cycling performance.Surprisingly,a symmetrical cell incorporating the MgMOF@PPy@CC electrode demonstrated impressive stability even under ultrahigh current density conditions(10mAcm^(–2)),maintaining operation for an extended 1200 h,surpassing previously reported benchmarks.Significantly,on coupling the MgMOF@PPy@CC anode with a Mo_(6)S_(8) cathode,the assembled battery showed an extended lifespan of 10,000 cycles at 70 C,with an outstanding capacity retention of 96.23%.This study provides a fresh perspective on the rational design of epitaxial electrocrystallization driven by metal–organic framework(MOF)substrates,paving the way toward the advancement of cuttingedge batteries.展开更多
The Company Law(2023 Revision)must match with the Civil Code.On the one hand,because the Company Law is systematically subordinate to the Civil Code,its internal value and external normative system should highly coord...The Company Law(2023 Revision)must match with the Civil Code.On the one hand,because the Company Law is systematically subordinate to the Civil Code,its internal value and external normative system should highly coordinate with the Civil Code.In addition,the"General Part"Book of the Civil Code provides nearly 3o direct general provisions on legal persons and for-profit legal persons.As a result,the Company Law is subject to a kind of clear and direct limitation within this scope.Accordingly,it may incorporate much more detailed provisions but shall contain no conflicting provisions.On the other hand,the Civil Code has adopted a special open system model,with special space and flexibility for other laws to match with it.Besides,since the Company Law and other specific laws were enacted relatively early and have evolved independently for a long time,they have a space of autonomy to some extent in practice.From the perspective of legislative matching relationship,the Company Law should be revised based on five circumstances by adopting different matching strategies according to different matching requirements.展开更多
Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. A new...Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. A new code match scheme for WCDMA code tree management was proposed. The code match scheme is similar to the existing crowed-first scheme. When choosing a code for a user, the code match scheme only compares the one up layer of the allocated codes, unlike the crowed-first scheme which perhaps compares all up layers. So the operation of code match scheme is simple, and the average time delay is decreased by 5.1%. The simulation results also show that the code match strategy can decrease the average code blocking probability by 8.4%.展开更多
Art students, as a whole, have a variety of learning style of sensory receivers. The Variety of learning styles requires the variety of teaching strategies. The analysis of learners＇ learning styles is one of the fac...Art students, as a whole, have a variety of learning style of sensory receivers. The Variety of learning styles requires the variety of teaching strategies. The analysis of learners＇ learning styles is one of the factors on which the design of learning strategies should be based. Matching teaching strategies and mismatching strategies are chosen intentionally according to the teaching contents, the teaching goals, and the learner＇s learning styles. Matching teaching strategies can reach the best result of teaching and learning. On the contrary, mismatching strategies can remedy the disadvantages caused by learning styles and be helpful for the development of learning styles.展开更多
Required by the supercritical carbon dioxide(s CO_(2))coal-fired power cycle,s CO_(2)entering a boiler has a high temperature and can cause overheating of tubes.To eliminate the pressure drop penalty effect,the s CO_(...Required by the supercritical carbon dioxide(s CO_(2))coal-fired power cycle,s CO_(2)entering a boiler has a high temperature and can cause overheating of tubes.To eliminate the pressure drop penalty effect,the s CO_(2)boiler consists of several modules,each having different heat flux received from the furnace side(q)and different CO_(2)temperature in the cooling wall tube(T_f).We aim to search for the best matching strategy coupling furnace side and tube side to obtain the lowest temperature of tubes.By theoretically analyzing the wall temperature influenced by q,T_f and a comprehensive thermal resistance C,two matching methods are introduced:the heat flux-temperature matching(HTM)which matches higher q with lower T_f,and the heat flux-heat flux matching(HHM)that matches higher q with higher allowable-heat-flux at the temperature limit of tubes.HTM is a conventional method but HHM is newly proposed here.We show that,if C is identical for different modules,the two methods coincide;otherwise,HHM is recommended.For a s CO_(2)boiler driving 1000 MWe power plant,smaller cooling wall temperatures are obtained by HHM than HTM.Based on HHM,the mid-partition wall,heat transfer enhancement,and downward flow are comprehensively used,decreasing the wall temperature significantly.展开更多
Organic vip-host doped systems possessing roomtemperature phosphorescence(RTP)have attracted substantial attention.Conventionally,researchers have primarily focused on the correlation between the electronic properti...Organic vip-host doped systems possessing roomtemperature phosphorescence(RTP)have attracted substantial attention.Conventionally,researchers have primarily focused on the correlation between the electronic properties and energy levels of molecules and their corresponding RTP behavior.While the role of the adaptability of molecular structure in modulating RTP is overlooked,it calls for further exploration.Herein,a series of vip-host systems were designed to realize bright red RTP with precisely structural regulation.Three naphthalimide derivatives with alkyl linkers of different lengths were utilized as vips and doped in hosts of three corresponding phthalimide derivatives.The doped systems with matched structures containing the exact-length alkyl linker exhibited a remarkable enhancement over 100 fold in RTP,analogous to the correct key fitting the right lock.In contrast,doped systems with mismatched structures showed almost undetectable RTP.Experimental results demonstrate that the suppression of nonradiative transition and structuredependent energy transfer of triplet excitons in the doped system play a crucial role in precisely structural matching,given that all vips possess similar electronic configurations and energy levels of excited states.This research may offer a novel insight into understanding the relationship between themolecular morphology and the RTP performance in host-vip systems.展开更多
基金Supported by the "Liaoning Baiqianwan" Talents Program(No.200718625)the Program of Scientific Research Project of Liao Ning Province Education Commission(No.LS2010046)the National Commonweal Industry Scientific Research Project(No.201003024)
文摘For the purpose of identifying the stern of the SWATH （Small Waterplane Area Twin Hull） availably and perfecting the detection technique of the SWATH ship＇s performance, this paper presents a novel bidirectional image registration strategy and mosaicing technique based on the scale invariant feature transform （SIFT） algorithm. The proposed method can help us observe the stern with a great visual angle for analyzing the performance of the control fins of the SWATH. SIFT is one of the most effective local features of the scale, rotation and illumination invariant. However, there are a few false match rates in this algorithm. In terms of underwater machine vision, only by acquiring an accurate match rate can we find an underwater robot rapidly and identify the location of the object. Therefore, firstly, the selection of the match ratio principle is put forward in this paper; secondly, some advantages of the bidirectional registration algorithm are concluded by analyzing the characteristics of the unidirectional matching method. Finally, an automatic underwater image splicing method is proposed on the basis of fixed dimension, and then the edge of the image＇s overlapping section is merged by the principal components analysis algorithm. The experimental results achieve a better registration and smooth mosaicing effect, demonstrating that the proposed method is effective.
基金National Natural Science Foundation of China,Grant/Award Number:31770608Postgraduate Research&Practice Innovation Program of Jiangsu Province,Grant/Award Number:KYCX22_1081Jiangsu Specially‐appointed Professorship Program,Grant/Award Number:Sujiaoshi[2016]20。
文摘The emergence of Li–Mg hybrid batteries has been receiving attention,owing to their enhanced electrochemical kinetics and reduced overpotential.Nevertheless,the persistent challenge of uneven Mg electrodeposition remains a significant impediment to their practical integration.Herein,we developed an ingenious approach that centered around epitaxial electrocrystallization and meticulously controlled growth of magnesium crystals on a specialized MgMOF substrate.The chosen MgMOF substrate demonstrated a robust affinity for magnesium and showed minimal lattice misfit with Mg,establishing the crucial prerequisites for successful heteroepitaxial electrocrystallization.Moreover,the incorporation of periodic electric fields and successive nanochannels within the MgMOF structure created a spatially confined environment that considerably promoted uniform magnesium nucleation at the molecular scale.Taking inspiration from the“blockchain”concept prevalent in the realm of big data,we seamlessly integrated a conductive polypyrrole framework,acting as a connecting“chain,”to interlink the“blocks”comprising the MgMOF cavities.This innovative design significantly amplified charge‐transfer efficiency,thereby increasing overall electrochemical kinetics.The resulting architecture(MgMOF@PPy@CC)served as an exceptional host for heteroepitaxial Mg electrodeposition,showcasing remarkable electrostripping/plating kinetics and excellent cycling performance.Surprisingly,a symmetrical cell incorporating the MgMOF@PPy@CC electrode demonstrated impressive stability even under ultrahigh current density conditions(10mAcm^(–2)),maintaining operation for an extended 1200 h,surpassing previously reported benchmarks.Significantly,on coupling the MgMOF@PPy@CC anode with a Mo_(6)S_(8) cathode,the assembled battery showed an extended lifespan of 10,000 cycles at 70 C,with an outstanding capacity retention of 96.23%.This study provides a fresh perspective on the rational design of epitaxial electrocrystallization driven by metal–organic framework(MOF)substrates,paving the way toward the advancement of cuttingedge batteries.
文摘The Company Law(2023 Revision)must match with the Civil Code.On the one hand,because the Company Law is systematically subordinate to the Civil Code,its internal value and external normative system should highly coordinate with the Civil Code.In addition,the"General Part"Book of the Civil Code provides nearly 3o direct general provisions on legal persons and for-profit legal persons.As a result,the Company Law is subject to a kind of clear and direct limitation within this scope.Accordingly,it may incorporate much more detailed provisions but shall contain no conflicting provisions.On the other hand,the Civil Code has adopted a special open system model,with special space and flexibility for other laws to match with it.Besides,since the Company Law and other specific laws were enacted relatively early and have evolved independently for a long time,they have a space of autonomy to some extent in practice.From the perspective of legislative matching relationship,the Company Law should be revised based on five circumstances by adopting different matching strategies according to different matching requirements.
基金Project(60202005) supported by the National Natural Science Foundation of China
文摘Orthogonal variable spreading factor channelization codes are widely used to provide variable data rates for supporting different bandwidth requirements in wideband code division multiple access (WCDMA) systems. A new code match scheme for WCDMA code tree management was proposed. The code match scheme is similar to the existing crowed-first scheme. When choosing a code for a user, the code match scheme only compares the one up layer of the allocated codes, unlike the crowed-first scheme which perhaps compares all up layers. So the operation of code match scheme is simple, and the average time delay is decreased by 5.1%. The simulation results also show that the code match strategy can decrease the average code blocking probability by 8.4%.
文摘Art students, as a whole, have a variety of learning style of sensory receivers. The Variety of learning styles requires the variety of teaching strategies. The analysis of learners＇ learning styles is one of the factors on which the design of learning strategies should be based. Matching teaching strategies and mismatching strategies are chosen intentionally according to the teaching contents, the teaching goals, and the learner＇s learning styles. Matching teaching strategies can reach the best result of teaching and learning. On the contrary, mismatching strategies can remedy the disadvantages caused by learning styles and be helpful for the development of learning styles.
基金support of the National Key R&D Program of China(2017YFB0601801)the National Natural Science Foundation of China(No.51776064)。
文摘Required by the supercritical carbon dioxide(s CO_(2))coal-fired power cycle,s CO_(2)entering a boiler has a high temperature and can cause overheating of tubes.To eliminate the pressure drop penalty effect,the s CO_(2)boiler consists of several modules,each having different heat flux received from the furnace side(q)and different CO_(2)temperature in the cooling wall tube(T_f).We aim to search for the best matching strategy coupling furnace side and tube side to obtain the lowest temperature of tubes.By theoretically analyzing the wall temperature influenced by q,T_f and a comprehensive thermal resistance C,two matching methods are introduced:the heat flux-temperature matching(HTM)which matches higher q with lower T_f,and the heat flux-heat flux matching(HHM)that matches higher q with higher allowable-heat-flux at the temperature limit of tubes.HTM is a conventional method but HHM is newly proposed here.We show that,if C is identical for different modules,the two methods coincide;otherwise,HHM is recommended.For a s CO_(2)boiler driving 1000 MWe power plant,smaller cooling wall temperatures are obtained by HHM than HTM.Based on HHM,the mid-partition wall,heat transfer enhancement,and downward flow are comprehensively used,decreasing the wall temperature significantly.
基金the financial support from the National Natural Science Foundation of China(grant nos.52373199,52073315,and 52473195)Scientific Research Platforms and Projects of University of Department of Education of Guangdong Province(grant no.2024KCXTD009)+1 种基金Key Discipline Research Capability Enhancement Project of Department of Education of Guangdong Province(grant no.2024ZDJS037)Fundamental Research Funds for the Central Universities,Sun Yat-sen University(grant no.23yxqntd002)。
文摘Organic vip-host doped systems possessing roomtemperature phosphorescence(RTP)have attracted substantial attention.Conventionally,researchers have primarily focused on the correlation between the electronic properties and energy levels of molecules and their corresponding RTP behavior.While the role of the adaptability of molecular structure in modulating RTP is overlooked,it calls for further exploration.Herein,a series of vip-host systems were designed to realize bright red RTP with precisely structural regulation.Three naphthalimide derivatives with alkyl linkers of different lengths were utilized as vips and doped in hosts of three corresponding phthalimide derivatives.The doped systems with matched structures containing the exact-length alkyl linker exhibited a remarkable enhancement over 100 fold in RTP,analogous to the correct key fitting the right lock.In contrast,doped systems with mismatched structures showed almost undetectable RTP.Experimental results demonstrate that the suppression of nonradiative transition and structuredependent energy transfer of triplet excitons in the doped system play a crucial role in precisely structural matching,given that all vips possess similar electronic configurations and energy levels of excited states.This research may offer a novel insight into understanding the relationship between themolecular morphology and the RTP performance in host-vip systems.
