This research introduced the design,analysis and optimization of bionic shrimp chela multi-cell tubes(BSCMTs)in bending by embedding an arthropod's microstructure inside a thin-walled square structure.A three-poin...This research introduced the design,analysis and optimization of bionic shrimp chela multi-cell tubes(BSCMTs)in bending by embedding an arthropod's microstructure inside a thin-walled square structure.A three-point impact bending finite element model was,in the first instance,correlated with physical tests and then modified to assess the energy absorption performance of bionic multi-cell tubes considering initial peak force,specific energy absorption and mean crushing force.Following a complex proportional assessment(COPRAS)approach and optimization phases,results demonstrated that the BSCMT with a W-shape section had the best energy absorption characteristics and should be considered in future as a possible contender for vehicle B-pillar structures that are subjected to bending and require excellent energy absorption properties to protect the occupants in high-speed impact collisions.展开更多
Scorpions are distributed almost all over the world and inhabit rainforests,deserts,mountains,and littoral zones.Their multifunctional chelae play a key role in their biology.The chela is the pincer that has originate...Scorpions are distributed almost all over the world and inhabit rainforests,deserts,mountains,and littoral zones.Their multifunctional chelae play a key role in their biology.The chela is the pincer that has originated from the last two segments of the pedipalp.Many previous studies have focused on the morphology of the chela and the overall pincer force.The knowledge about the material properties of scorpion chelae remains rather poor.In particular,little is known about the spines located on the grasping edge of the chela.In this study,we use a combination of nanoindentation,micro-computer tomography,confocal laser scanning microscopy,scanning electron microscopy and energy-dispersive X-ray elemental analysis,to examine the mechanical properties,relative density,sclerotization level,microstructure and biomineralization of both the regular cuticle and the spine cuticle of the chela in the scorpion Androctonus bicolor.Our results show that the mechanical property values of the spine cuticle are significantly higher than those of the regular cuticle.This can reduce the risk of damage to the chela,increase the chance of indentation into the prey tissue and is very likely to result from both higher sclerotization level and biomineralization due to the accumulation of zinc.The specialized microstructure of the cuticle could contribute to the enhancement of the stiffness,strength and toughness of the chela.This study aids in better understanding the material structure,composition and properties of the scorpion chela cuticle.展开更多
This paper is an attempt to document life of male sex workers as transgender in Pakistan and to describe their cultural practices with reference to ritual performs on different occasion. Qualitative research methods c...This paper is an attempt to document life of male sex workers as transgender in Pakistan and to describe their cultural practices with reference to ritual performs on different occasion. Qualitative research methods combing in-depth interviews, FGDs, and observation were employed to gather information. An effort has been made to investigate the cultural life of the transgender and the pattern of their social interaction within the community as well as with the outsiders. Analysis based on thematic description of the themes generated after reviewing data. The research process revealed that males who were engaged in the sex industry have two types of sociological division: first, young and having male identity with potential to transform in transgender;while other transgender plays dual roles: a) within sex worker community as transgender women, b) male outside the transgender community. These males fulfill their socio-psychological and economic needs through entrance in the transgender community. Most of them consider themselves as having feminine soul and masculine body. The male engaging in sex work is a complex phenomenon with reference to their identity and performance of cultural rituals. An exploratory research study needs to be conducted to unfold the notion of dual identity which male sex workers have.展开更多
基金supported by the 2022 Guangxi University Young and Middle-aged Teachers’Basic Research Ability Improvement Project(Grant No.2022KY0781)Scientific Research Funds of Guilin University of Aerospace Technology(Grant No.XJ21KT18)the Major Special Projects of Liuzhou Science and Technology Plan(Grant No.2022ABA0106).
文摘This research introduced the design,analysis and optimization of bionic shrimp chela multi-cell tubes(BSCMTs)in bending by embedding an arthropod's microstructure inside a thin-walled square structure.A three-point impact bending finite element model was,in the first instance,correlated with physical tests and then modified to assess the energy absorption performance of bionic multi-cell tubes considering initial peak force,specific energy absorption and mean crushing force.Following a complex proportional assessment(COPRAS)approach and optimization phases,results demonstrated that the BSCMT with a W-shape section had the best energy absorption characteristics and should be considered in future as a possible contender for vehicle B-pillar structures that are subjected to bending and require excellent energy absorption properties to protect the occupants in high-speed impact collisions.
基金financially supported by the Grant GO995/48-1 to S.N.G.from the National Priority Program SPP2416″Code-Chi-Chitin,chitosan and chitooligosaccharides and their interaction with proteins of the extracellular matrix and cellular signaling”of the German Science Foundation(DFG).
文摘Scorpions are distributed almost all over the world and inhabit rainforests,deserts,mountains,and littoral zones.Their multifunctional chelae play a key role in their biology.The chela is the pincer that has originated from the last two segments of the pedipalp.Many previous studies have focused on the morphology of the chela and the overall pincer force.The knowledge about the material properties of scorpion chelae remains rather poor.In particular,little is known about the spines located on the grasping edge of the chela.In this study,we use a combination of nanoindentation,micro-computer tomography,confocal laser scanning microscopy,scanning electron microscopy and energy-dispersive X-ray elemental analysis,to examine the mechanical properties,relative density,sclerotization level,microstructure and biomineralization of both the regular cuticle and the spine cuticle of the chela in the scorpion Androctonus bicolor.Our results show that the mechanical property values of the spine cuticle are significantly higher than those of the regular cuticle.This can reduce the risk of damage to the chela,increase the chance of indentation into the prey tissue and is very likely to result from both higher sclerotization level and biomineralization due to the accumulation of zinc.The specialized microstructure of the cuticle could contribute to the enhancement of the stiffness,strength and toughness of the chela.This study aids in better understanding the material structure,composition and properties of the scorpion chela cuticle.
文摘This paper is an attempt to document life of male sex workers as transgender in Pakistan and to describe their cultural practices with reference to ritual performs on different occasion. Qualitative research methods combing in-depth interviews, FGDs, and observation were employed to gather information. An effort has been made to investigate the cultural life of the transgender and the pattern of their social interaction within the community as well as with the outsiders. Analysis based on thematic description of the themes generated after reviewing data. The research process revealed that males who were engaged in the sex industry have two types of sociological division: first, young and having male identity with potential to transform in transgender;while other transgender plays dual roles: a) within sex worker community as transgender women, b) male outside the transgender community. These males fulfill their socio-psychological and economic needs through entrance in the transgender community. Most of them consider themselves as having feminine soul and masculine body. The male engaging in sex work is a complex phenomenon with reference to their identity and performance of cultural rituals. An exploratory research study needs to be conducted to unfold the notion of dual identity which male sex workers have.
