A ball valve is a common mechanical product for connecting and closing a media outlet in equipment. To adapt to pipes of different sizes, a ball valve is often designed into a serial product of standard specifications...A ball valve is a common mechanical product for connecting and closing a media outlet in equipment. To adapt to pipes of different sizes, a ball valve is often designed into a serial product of standard specifications. In accordance with usual routine designing, it is demanded to draw a set of blueprints for every specification and to mark its sizes. We propose using the configuration functions in the three dimensional designing software SolidWords to realize the ball valve product＇s serialization for effective designing. It only requires designing a set of blueprint integrated with a serial parts designing chart. In this way, it can accomplish the designing process of a numeral blueprint. Successful applications proves that this method is practical for serial parts＇ design.展开更多
Buagafuran is a novel drug candidate derived from natural product.Its absolute configuration has been confirmed by electronic circular dichroism combined with modern quantum-chemical calculation using time-dependent d...Buagafuran is a novel drug candidate derived from natural product.Its absolute configuration has been confirmed by electronic circular dichroism combined with modern quantum-chemical calculation using time-dependent density functional theory.The predicted UV absorbance peak is underestimated by several nanometers compared with the experimental data.The applicability of empirical rule for the C=C-C-O system in Buagafuran has also been discussed.Our results show that electronic circular dichroism could be a useful tool for the absolute configuration assignment of chiral drugs,especially for the oily or semisolid substances,whose crystal structures are impossible to obtain.展开更多
Chiroptical properties including electronic circular dichroism（ECD） and optical rotatory dispersion（ORD） of artemisinin and artemether have been fully studied using quantum-chemical calculation based on time-depen...Chiroptical properties including electronic circular dichroism（ECD） and optical rotatory dispersion（ORD） of artemisinin and artemether have been fully studied using quantum-chemical calculation based on time-dependent density functional theory.Both theoretical ECD and ORD of these two compounds were in good match with the experimental data.ECD spectrum of artemether could be totally attributed to the peroxide group,and that of artemisinin was an overlay of contribution from δ-lactone and peroxide moieties,which leading to a positive maximum at 260 nm.Our results showed that peroxide group could produce a broad ECD band in the far-UV region originated from electron transitions of HOMO →LUMO,HOMO-1 →LUMO and HOMO-2 →LUMO in the case of artemether.This work provided a theoretical interpretation of the ECD behavior of peroxide bond.展开更多
This study explores the interaction between spatial configuration,natural mobility,and visual accessibility in exhibition spaces,an area that remains underexplored.By integrating visibility graph analysis(VGA),intelli...This study explores the interaction between spatial configuration,natural mobility,and visual accessibility in exhibition spaces,an area that remains underexplored.By integrating visibility graph analysis(VGA),intelligent agent simulation(IAS),topological analysis,and field observation,the research examines functional layout and accessibility across four museums.Findings indicate that corridors and pathways,second only to exhibition halls,play a crucial role in spatial mobility.Composite layouts(e.g.,circular and L-shaped designs)exhibit superior mean depth and integration,yet connectivity and mean depth demonstrate a nonlinear relationship.Elongated or complex path turns increase cognitive load,complicating navigation,while open passageways promote smoother visitor distribution.Topological analysis effectively identifies optimal nodes,key locations,and path-turn efficiency under accessibility constraints.Visitor dwell time is shaped not only by exhibit content but also by spatial location,entry sequence,and visitor density.Results support the assumption that space syntax models align with realworld visitor flow patterns,yet predictive models fail to fully capture variations in mobility across different timeframes and behavioral contexts.These insights contribute to optimizing museum design for improved visitor experience and spatial efficiency.展开更多
The potential energy curves （PECs） of the 3Π states of GaX （X=F, Cl, and Br） molecules are calculated using the multireference configuration interaction method with a large contracted basis set aug-cc-pV5Z. The P...The potential energy curves （PECs） of the 3Π states of GaX （X=F, Cl, and Br） molecules are calculated using the multireference configuration interaction method with a large contracted basis set aug-cc-pV5Z. The PECs are accurately fitted to analytical potential energy functions （APEFs） using the Murrell–Sorbie potential function. The spectroscopic parameters for the states are determined using the obtained APEFs, and compared with the theoretical and experimental data available presently in the literature.展开更多
The maturity of big data analysis theory and its tools improve the efficiency and reduce the cost of massive data mining.This paper discusses the method of product customer demand mining based on big data,and further ...The maturity of big data analysis theory and its tools improve the efficiency and reduce the cost of massive data mining.This paper discusses the method of product customer demand mining based on big data,and further studies the configuration of product function attributes.Firstly,the Hadoop platform was used to perform product attribute data participle and feature word extraction based on Apriori algorithm was used to mine product customer demand information.And then the MapReduce model on the big data platform was applied into efficient parallel data processing,obtaining product attributes with research value,and their weights and attribute levels.After that,the cloud model and the MNL model were employed to construct the product function attribute configuration model,and the improved artificial bee colony algorithm was used to solve the model.The optimal solution of the product function attribute configuration model was got.Finally,an example was given to illustrate the feasibility of the proposed method in this paper.展开更多
文摘A ball valve is a common mechanical product for connecting and closing a media outlet in equipment. To adapt to pipes of different sizes, a ball valve is often designed into a serial product of standard specifications. In accordance with usual routine designing, it is demanded to draw a set of blueprints for every specification and to mark its sizes. We propose using the configuration functions in the three dimensional designing software SolidWords to realize the ball valve product＇s serialization for effective designing. It only requires designing a set of blueprint integrated with a serial parts designing chart. In this way, it can accomplish the designing process of a numeral blueprint. Successful applications proves that this method is practical for serial parts＇ design.
基金supported by the Fundamental Research Funds for the Central Institutes(No.2012ZD03)
文摘Buagafuran is a novel drug candidate derived from natural product.Its absolute configuration has been confirmed by electronic circular dichroism combined with modern quantum-chemical calculation using time-dependent density functional theory.The predicted UV absorbance peak is underestimated by several nanometers compared with the experimental data.The applicability of empirical rule for the C=C-C-O system in Buagafuran has also been discussed.Our results show that electronic circular dichroism could be a useful tool for the absolute configuration assignment of chiral drugs,especially for the oily or semisolid substances,whose crystal structures are impossible to obtain.
基金supported by the Fundamental Research Funds for the Central Institutes of China(No.2012ZD03)
文摘Chiroptical properties including electronic circular dichroism（ECD） and optical rotatory dispersion（ORD） of artemisinin and artemether have been fully studied using quantum-chemical calculation based on time-dependent density functional theory.Both theoretical ECD and ORD of these two compounds were in good match with the experimental data.ECD spectrum of artemether could be totally attributed to the peroxide group,and that of artemisinin was an overlay of contribution from δ-lactone and peroxide moieties,which leading to a positive maximum at 260 nm.Our results showed that peroxide group could produce a broad ECD band in the far-UV region originated from electron transitions of HOMO →LUMO,HOMO-1 →LUMO and HOMO-2 →LUMO in the case of artemether.This work provided a theoretical interpretation of the ECD behavior of peroxide bond.
基金funded by the 2024 Individual Academic Enhancement Project of the University Project Pool,entitled“Reproduction and Reconstruction of Historical and Cultural Spaces in the Theoretical Perspective of the Field of Memory(Grant No.24XSC14)”the R&D Program of Beijing Municipal Education Commission(Grant No.SZ202110009003).
文摘This study explores the interaction between spatial configuration,natural mobility,and visual accessibility in exhibition spaces,an area that remains underexplored.By integrating visibility graph analysis(VGA),intelligent agent simulation(IAS),topological analysis,and field observation,the research examines functional layout and accessibility across four museums.Findings indicate that corridors and pathways,second only to exhibition halls,play a crucial role in spatial mobility.Composite layouts(e.g.,circular and L-shaped designs)exhibit superior mean depth and integration,yet connectivity and mean depth demonstrate a nonlinear relationship.Elongated or complex path turns increase cognitive load,complicating navigation,while open passageways promote smoother visitor distribution.Topological analysis effectively identifies optimal nodes,key locations,and path-turn efficiency under accessibility constraints.Visitor dwell time is shaped not only by exhibit content but also by spatial location,entry sequence,and visitor density.Results support the assumption that space syntax models align with realworld visitor flow patterns,yet predictive models fail to fully capture variations in mobility across different timeframes and behavioral contexts.These insights contribute to optimizing museum design for improved visitor experience and spatial efficiency.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11174117 and 10974078)the Program for Scientific Research Innova-tion Team in Colleges and Universities of Shandong Province,China
文摘The potential energy curves （PECs） of the 3Π states of GaX （X=F, Cl, and Br） molecules are calculated using the multireference configuration interaction method with a large contracted basis set aug-cc-pV5Z. The PECs are accurately fitted to analytical potential energy functions （APEFs） using the Murrell–Sorbie potential function. The spectroscopic parameters for the states are determined using the obtained APEFs, and compared with the theoretical and experimental data available presently in the literature.
基金the National Natural Science Foundation of China granted 71961005the Guangxi Science and Technology Program granted 1598007-15.
文摘The maturity of big data analysis theory and its tools improve the efficiency and reduce the cost of massive data mining.This paper discusses the method of product customer demand mining based on big data,and further studies the configuration of product function attributes.Firstly,the Hadoop platform was used to perform product attribute data participle and feature word extraction based on Apriori algorithm was used to mine product customer demand information.And then the MapReduce model on the big data platform was applied into efficient parallel data processing,obtaining product attributes with research value,and their weights and attribute levels.After that,the cloud model and the MNL model were employed to construct the product function attribute configuration model,and the improved artificial bee colony algorithm was used to solve the model.The optimal solution of the product function attribute configuration model was got.Finally,an example was given to illustrate the feasibility of the proposed method in this paper.
