Water splitting powered by clean electricity is a sustainable and promising approach to produce green hydrogen.Currently,noble metal(e.g.Iridium,Ruthenium,Platinum)-based catalysts are most widely used for water split...Water splitting powered by clean electricity is a sustainable and promising approach to produce green hydrogen.Currently,noble metal(e.g.Iridium,Ruthenium,Platinum)-based catalysts are most widely used for water splitting electrolysis.However,noble metal-based catalysts often suffer from multiple disadvantages,including high cost,low selectivity and poor durability.The emergence of metal-organic framework nanosheets(MOFNSs)attracts significant attention due to their unique advantages.Here,a concise,yet comprehensive and critical,review of recent advances in the field of MOFNSs is provided.This review explains the fundamental oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)catalytic mechanisms as well as key characterization techniques for the structure-activity relationship study are discussed.Moreover,it discusses efficient design strategies and the brief research advances of MOFNSs in HER,OER,and bifunctional electrocatalysis,along with some challenges and opportunities.展开更多
The K-COD (K-Complete Orthogonal Decomposition) algorithm for generating adaptive dictionary for signals sparse representation in the framework of K-means clustering is proposed in this paper,in which rank one approxi...The K-COD (K-Complete Orthogonal Decomposition) algorithm for generating adaptive dictionary for signals sparse representation in the framework of K-means clustering is proposed in this paper,in which rank one approximation for components assembling signals based on COD and K-means clustering based on chaotic random search are well utilized. The results of synthetic test and empirical experiment for the real data show that the proposed algorithm outperforms recently reported alternatives: K-Singular Value Decomposition (K-SVD) algorithm and Method of Optimal Directions (MOD) algorithm.展开更多
To collect and share information of projects or products and make it consistent and correct so that the quality and costs of projects can be effectively controlled,an integrative project architecture integrating diffe...To collect and share information of projects or products and make it consistent and correct so that the quality and costs of projects can be effectively controlled,an integrative project architecture integrating different types of breakdown structures is necessary.In this paper,the international research status on work breakdown structure(WBS)was analyzed,and an integrative project architecture for commercial aero-engines was designed,where product breakdown structure(PBS),WBS,organization breakdown structure(OBS)and cost breakdown structure(CBS)were integrated and built.And the architecture was applied in information systems.A transfer from technological views of complex products through their lifecycles to management views has been realized with this standardized architecture,thus development tasks and costs can be controlled.展开更多
This paper has deduced a non-parameter analysis framework that can estimate the sources of economic growth based on provincial data as samples. Result of the estimate indicates that between 1978 and 2010, TFP, labor a...This paper has deduced a non-parameter analysis framework that can estimate the sources of economic growth based on provincial data as samples. Result of the estimate indicates that between 1978 and 2010, TFP, labor and capital contributed to China＇s economic growth by 10.9%, 3.7% and 85.4% respectively. If the impact of global financial crisis is not taken into account, these figures should be 20.70/0, 3.3% and 76.0%. Contribution of labor to economic growth is the smallest, below 8%for most of the years. Share of TFP contribution increased before the 1990s despite wild swings, exceeding 50% in 1992, followed by continuous decline until well below 10% after 2005. Share of capital contribution decreased before 1990s with wild swings and maintained an upward trend after 1992, approaching 90% after 2005.展开更多
Listening comprehension plays a crucial and necessary part in people＇s daily communication and Second Language Acquisition （SLA）. It is an important way to communicate with others; also it is the foundation of mast...Listening comprehension plays a crucial and necessary part in people＇s daily communication and Second Language Acquisition （SLA）. It is an important way to communicate with others; also it is the foundation of mastering a foreign language. However, the higher vocational students usually lack the background information about the listening materials and seldom know how to make inferences according to the specific contexts. The author conducted an empirical study lasting one semester in Higher Vocational College of Dahongying University trying to apply Relevance Theory to listening comprehension and guide listening comprehension learning within the framework of Relevance Theory to finally improve higher vocational students＇ ability of listening comprehension.展开更多
文摘Water splitting powered by clean electricity is a sustainable and promising approach to produce green hydrogen.Currently,noble metal(e.g.Iridium,Ruthenium,Platinum)-based catalysts are most widely used for water splitting electrolysis.However,noble metal-based catalysts often suffer from multiple disadvantages,including high cost,low selectivity and poor durability.The emergence of metal-organic framework nanosheets(MOFNSs)attracts significant attention due to their unique advantages.Here,a concise,yet comprehensive and critical,review of recent advances in the field of MOFNSs is provided.This review explains the fundamental oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)catalytic mechanisms as well as key characterization techniques for the structure-activity relationship study are discussed.Moreover,it discusses efficient design strategies and the brief research advances of MOFNSs in HER,OER,and bifunctional electrocatalysis,along with some challenges and opportunities.
基金Supported by the National Natural Science Foundation of China under Grants (No. 60872123 & U0835001)by Natural Science Foundation of Guangdong Province, China (No. 07006496)
文摘The K-COD (K-Complete Orthogonal Decomposition) algorithm for generating adaptive dictionary for signals sparse representation in the framework of K-means clustering is proposed in this paper,in which rank one approximation for components assembling signals based on COD and K-means clustering based on chaotic random search are well utilized. The results of synthetic test and empirical experiment for the real data show that the proposed algorithm outperforms recently reported alternatives: K-Singular Value Decomposition (K-SVD) algorithm and Method of Optimal Directions (MOD) algorithm.
文摘To collect and share information of projects or products and make it consistent and correct so that the quality and costs of projects can be effectively controlled,an integrative project architecture integrating different types of breakdown structures is necessary.In this paper,the international research status on work breakdown structure(WBS)was analyzed,and an integrative project architecture for commercial aero-engines was designed,where product breakdown structure(PBS),WBS,organization breakdown structure(OBS)and cost breakdown structure(CBS)were integrated and built.And the architecture was applied in information systems.A transfer from technological views of complex products through their lifecycles to management views has been realized with this standardized architecture,thus development tasks and costs can be controlled.
文摘This paper has deduced a non-parameter analysis framework that can estimate the sources of economic growth based on provincial data as samples. Result of the estimate indicates that between 1978 and 2010, TFP, labor and capital contributed to China＇s economic growth by 10.9%, 3.7% and 85.4% respectively. If the impact of global financial crisis is not taken into account, these figures should be 20.70/0, 3.3% and 76.0%. Contribution of labor to economic growth is the smallest, below 8%for most of the years. Share of TFP contribution increased before the 1990s despite wild swings, exceeding 50% in 1992, followed by continuous decline until well below 10% after 2005. Share of capital contribution decreased before 1990s with wild swings and maintained an upward trend after 1992, approaching 90% after 2005.
文摘Listening comprehension plays a crucial and necessary part in people＇s daily communication and Second Language Acquisition （SLA）. It is an important way to communicate with others; also it is the foundation of mastering a foreign language. However, the higher vocational students usually lack the background information about the listening materials and seldom know how to make inferences according to the specific contexts. The author conducted an empirical study lasting one semester in Higher Vocational College of Dahongying University trying to apply Relevance Theory to listening comprehension and guide listening comprehension learning within the framework of Relevance Theory to finally improve higher vocational students＇ ability of listening comprehension.
