Low-voltage direct current(DC)microgrids have recently emerged as a promising and viable alternative to traditional alternating cur-rent(AC)microgrids,offering numerous advantages.Consequently,researchers are explorin...Low-voltage direct current(DC)microgrids have recently emerged as a promising and viable alternative to traditional alternating cur-rent(AC)microgrids,offering numerous advantages.Consequently,researchers are exploring the potential of DC microgrids across var-ious configurations.However,despite the sustainability and accuracy offered by DC microgrids,they pose various challenges when integrated into modern power distribution systems.Among these challenges,fault diagnosis holds significant importance.Rapid fault detection in DC microgrids is essential to maintain stability and ensure an uninterrupted power supply to critical loads.A primary chal-lenge is the lack of standards and guidelines for the protection and safety of DC microgrids,including fault detection,location,and clear-ing procedures for both grid-connected and islanded modes.In response,this study presents a brief overview of various approaches for protecting DC microgrids.展开更多
Employing the method which can be used to demonstrate the infinite conservation laws for the standard Kortewegde Vries （KdV） equation, we prove that the variable-coeFficient KdV equation under the Painlevé test...Employing the method which can be used to demonstrate the infinite conservation laws for the standard Kortewegde Vries （KdV） equation, we prove that the variable-coeFficient KdV equation under the Painlevé test condition also possesses the formal conservation laws.展开更多
This paper presents a Model-Based Design(MBD)approach for the design and control of a customized manipulator intended for drilling and position-ing of dental implants accurately with minimal human intervention.While p...This paper presents a Model-Based Design(MBD)approach for the design and control of a customized manipulator intended for drilling and position-ing of dental implants accurately with minimal human intervention.While performing an intra-oral surgery for a prolonged duration within a limited oral cavity,the tremor of dentist's hand is inevitable.As a result,wielding the drilling tool and inserting the dental implants safely in accurate position and orientation is highly challenging even for experienced dentists.Therefore,we introduce a customized manipulator that is designed ergonomically by taking in to account the dental chair specifications and anthropomorphic data such that it can be readily mounted onto the existing dental chair.The manipulator can be used to drill holes for dental inserts and position them with improved accuracy and safety.Further-more,a thorough multi-body motion analysis of the manipulator was carried out by creating a virtual prototype of the manipulator and simulating its controlled movements in various scenarios.The overall design was prepared and validated in simulation using Solid works,MATLAB and Simulink through Model Based Design(MBD)approach.The motion simulation results indicate that the manipulator could be built as a prototype readily.展开更多
The present paper studies the dynamic pehaviour of a complex piping system containing internal fluid flow.A generalized complex modal decomposition method is proposed for modeling the piping structure.A characteristic...The present paper studies the dynamic pehaviour of a complex piping system containing internal fluid flow.A generalized complex modal decomposition method is proposed for modeling the piping structure.A characteristic impedance transfer matrix of piping flow with a frequency-dependent friction is employed for describing the model of fluid flow,which is coupled to the structural model by means of an approach similar to that used in the structural modal synthesis.The coupled model is practicable for the detecting,monitoring,controlling or predicting of piping vibrations,and for the studying of fluid dynamic characteristics under the influence of structural vibration,also for the diagnosticating of the piping system.展开更多
The aim of this study was to present a systematic approach to select lactic acid bacteria strains to be added in food products and with antimicrobial properties against Listeria monocytogenes and Staphylococcus aureus...The aim of this study was to present a systematic approach to select lactic acid bacteria strains to be added in food products and with antimicrobial properties against Listeria monocytogenes and Staphylococcus aureus.A total of 73 lactic acid bacteria was selected and tested for their antimicrobial activity against the target pathogens.A subgroup of 44 isolates was selected applying the Principal Component Analysis and tested for co-aggregation and inhibition of biofilm forming ability against the two target pathogens.Based on the latter properties and Heat Map Analysis,10 strains were submitted to whole genome sequencing to achieve the species identification and explore the presence of genes coding virulence factors and for bacteriocin.The application of the systematic approach presented in this study resulted in the final selection of one Lactobacillus paracasei and four Lactobacillus fermentum strains promising as strains to be added in food products.展开更多
Remarkable strides have been made in science ever since the scientific revolution in the 17th century, and the scientific community continues to prosper today. In its professional activities and social life, this comm...Remarkable strides have been made in science ever since the scientific revolution in the 17th century, and the scientific community continues to prosper today. In its professional activities and social life, this community has created a scientific culture that is increasingly prosperous and is having a significant impact on the development of human culture. The scientific culture has distinctive features that are different from those of the literary culture. For example, it emphasizes the decisive role of objective examination in the course of enquiry to reduce the impact of the subjectivity of researchers on the results. It also stresses the objectivity of knowledge and testing that objectivity through reproducibility. It favours experimental and mathematical approaches while underestimating the roles of imaginal and intuitive thinking, and advocates the values of utilitarianism. This paper concludes that the distinctive features of the scientific culture should be examined in the course of its current development to eliminate the negative impact of utilitarianism.展开更多
文摘Low-voltage direct current(DC)microgrids have recently emerged as a promising and viable alternative to traditional alternating cur-rent(AC)microgrids,offering numerous advantages.Consequently,researchers are exploring the potential of DC microgrids across var-ious configurations.However,despite the sustainability and accuracy offered by DC microgrids,they pose various challenges when integrated into modern power distribution systems.Among these challenges,fault diagnosis holds significant importance.Rapid fault detection in DC microgrids is essential to maintain stability and ensure an uninterrupted power supply to critical loads.A primary chal-lenge is the lack of standards and guidelines for the protection and safety of DC microgrids,including fault detection,location,and clear-ing procedures for both grid-connected and islanded modes.In response,this study presents a brief overview of various approaches for protecting DC microgrids.
基金Supported by the Key Project of Chinese Ministry of Education under Grant No 106033, the National Natural Science Foundation of China under Grant Nos 60372095 and 60772023, Open Fund of the State Key Laboratory of Software Development Environment under Grant No SKLSDE-07-001, Beijing University of Aeronautics and Astronautics, the National Basic Research Programme of China under Grant No 2005CB321901, the Green Path Programme of Air Force of the Chinese People＇s Liberation Army, the Cheung Kong Scholars Programme of the Ministry of Education of China and Li Ka Shing Foundation of Hong Kong.
文摘Employing the method which can be used to demonstrate the infinite conservation laws for the standard Kortewegde Vries （KdV） equation, we prove that the variable-coeFficient KdV equation under the Painlevé test condition also possesses the formal conservation laws.
文摘This paper presents a Model-Based Design(MBD)approach for the design and control of a customized manipulator intended for drilling and position-ing of dental implants accurately with minimal human intervention.While performing an intra-oral surgery for a prolonged duration within a limited oral cavity,the tremor of dentist's hand is inevitable.As a result,wielding the drilling tool and inserting the dental implants safely in accurate position and orientation is highly challenging even for experienced dentists.Therefore,we introduce a customized manipulator that is designed ergonomically by taking in to account the dental chair specifications and anthropomorphic data such that it can be readily mounted onto the existing dental chair.The manipulator can be used to drill holes for dental inserts and position them with improved accuracy and safety.Further-more,a thorough multi-body motion analysis of the manipulator was carried out by creating a virtual prototype of the manipulator and simulating its controlled movements in various scenarios.The overall design was prepared and validated in simulation using Solid works,MATLAB and Simulink through Model Based Design(MBD)approach.The motion simulation results indicate that the manipulator could be built as a prototype readily.
文摘The present paper studies the dynamic pehaviour of a complex piping system containing internal fluid flow.A generalized complex modal decomposition method is proposed for modeling the piping structure.A characteristic impedance transfer matrix of piping flow with a frequency-dependent friction is employed for describing the model of fluid flow,which is coupled to the structural model by means of an approach similar to that used in the structural modal synthesis.The coupled model is practicable for the detecting,monitoring,controlling or predicting of piping vibrations,and for the studying of fluid dynamic characteristics under the influence of structural vibration,also for the diagnosticating of the piping system.
基金supported by EU program,Partnership on Research and Innovation in the Mediterranean Area,PRIMA.ARTISANEFOOD Project,PRIMA-S2-2018-PCI2019-103453 CALL:PRIMA-S2-2018-PCI2019:Innovative Bio interventions and Risk Modelling Approaches for Ensuring Microbial Safety and Quality of Mediterranean Artisanal Fermented Foods。
文摘The aim of this study was to present a systematic approach to select lactic acid bacteria strains to be added in food products and with antimicrobial properties against Listeria monocytogenes and Staphylococcus aureus.A total of 73 lactic acid bacteria was selected and tested for their antimicrobial activity against the target pathogens.A subgroup of 44 isolates was selected applying the Principal Component Analysis and tested for co-aggregation and inhibition of biofilm forming ability against the two target pathogens.Based on the latter properties and Heat Map Analysis,10 strains were submitted to whole genome sequencing to achieve the species identification and explore the presence of genes coding virulence factors and for bacteriocin.The application of the systematic approach presented in this study resulted in the final selection of one Lactobacillus paracasei and four Lactobacillus fermentum strains promising as strains to be added in food products.
文摘Remarkable strides have been made in science ever since the scientific revolution in the 17th century, and the scientific community continues to prosper today. In its professional activities and social life, this community has created a scientific culture that is increasingly prosperous and is having a significant impact on the development of human culture. The scientific culture has distinctive features that are different from those of the literary culture. For example, it emphasizes the decisive role of objective examination in the course of enquiry to reduce the impact of the subjectivity of researchers on the results. It also stresses the objectivity of knowledge and testing that objectivity through reproducibility. It favours experimental and mathematical approaches while underestimating the roles of imaginal and intuitive thinking, and advocates the values of utilitarianism. This paper concludes that the distinctive features of the scientific culture should be examined in the course of its current development to eliminate the negative impact of utilitarianism.
