Background:While various factors contributing to delinquency have been explored,the role of selfesteem in this specific context has received little attention.Hence,this study aims to investigate the complex issue of a...Background:While various factors contributing to delinquency have been explored,the role of selfesteem in this specific context has received little attention.Hence,this study aims to investigate the complex issue of adolescent delinquency in Iran by focusing on the mediating role of self-esteem in the relationship between parental attachment and delinquent behavior.Methods:Using the multistage cluster random sampling method,the research involved 528 high school students in Tehran.Each student completed validated scales assessing their parental attachment,self-esteem,and delinquency at school.Multiple regression analyses with the Sobel test and bootstrappingmethod were used to examine mediated effects.Results:Thefindings reveal that self-esteem significantly mediates the relationship betweenmaternal attachment and delinquency(standardized coefficient=−0.0292;p=0.04).Adolescents with secure maternal attachments tend to exhibit higher self-esteem,which reduces the likelihood of delinquent behavior.In contrast,paternal attachment did not show a significant mediating effect in this study.These results underscore the importance of cultivating secure maternal relationships and fostering positive self-esteem to address adolescent delinquency.Conclusion:The study suggests that targeted interventions that strengthen maternal attachment and boost self-esteem could effectively mitigate delinquent behaviors among Iranian adolescents.These interventions should prioritize the emotional support and value of secure maternal bonds as key factors in promoting healthy adolescent development.展开更多
Objectives:Attachment is a profound and enduring connection to the emotion children progressively form with their parents as they mature.It significantly impacts the social and psychological development of kids and te...Objectives:Attachment is a profound and enduring connection to the emotion children progressively form with their parents as they mature.It significantly impacts the social and psychological development of kids and teenagers.This study aimed to explore the latent profiles and longitudinal transition patterns of parent-child and peer attachments among adolescents.Methods:A cohort of 914 participants from China completed the measures with a twelve-month interval.There were 46.8%boys and 53.2%girls in this survey.Latent profile analysis(LPA)was adopted to explore the distinct profiles reflecting different parent-child and peer attachment response patterns at each time point.Latent transition analysis(LTA)was used to examine the membership of distinct latent profiles and how individuals move between profiles over time.Results:Three latent profiles were found:the poor parent-child communication profile,the moderate attachment profile,and the good attachment profile.It was shown that the transition probability from the poor parent-child communication and good attachment profiles to the moderate attachment profile was higher than the transition probability between the poor parent-child communication and good attachment profiles.Patterns of parent-child and peer attachments were associated with depression and anxiety.Conclusion:This study demonstrates differences in adolescents’attachment to fathers,mothers,and peers and the need for targeted interventions for groups of adolescents with moderate levels of parent-child and peer attachment.展开更多
Background:Live streaming has become a globally prevalent form of digital entertainment,particularly among young audiences,fostering new modes of online engagement through real-time interaction.However,excessive use m...Background:Live streaming has become a globally prevalent form of digital entertainment,particularly among young audiences,fostering new modes of online engagement through real-time interaction.However,excessive use may lead to addictive behaviors in certain users.Current research on live-streaming addiction remains limited,with prior studies focusing primarily on socio-psychological drivers rather than the role of technological affordances.To address this gap,this study develops a conceptual model based on socio-technical systems and attachment theory to investigate how emotional and functional attachment mediate the relationship between platform features and addictive behavior.Methods:A total of 533 valid responses were collected in a cross-sectional survey(mean age=26.4 years,standard deviation[SD]=4.7;53.8%female).Data were analyzed using structural equation modeling(SEM)to test the hypothesized relationships.Additionally,the potential mediating effects of emotional and functional attachment between the platform features and live-streaming addiction were examined using the Bootstrap method.Results:Social factors(perceived interactivity,β=0.204,p<0.001;perceived confirmation,β=0.379,p<0.001)and technical factors(perceived customization,β=0.227,p<0.001;perceived amusement,β=0.252,p<0.001;vicarious expression,β=0.352,p<0.001)significantly strengthen both emotional and functional attachment,which in turn positively predict live-streaming addiction(emotional attachment:β=0.468,p<0.001;functional attachment:β=0.393,p<0.001).Furthermore,emotional attachment exerted a stronger influence on addiction than functional attachment.Conclusions:These findings deepen the understanding of live-streaming addiction by integrating socio-technical perspectives and offer practical implications for stakeholders to mitigate negative outcomes through effective strategies.展开更多
BACKGROUND The primary issue in managing edentulous patients is the severely resorbed mandibular ridge,particularly in older individuals with diminished adaptive capacities.This compromised situation leads to the fabr...BACKGROUND The primary issue in managing edentulous patients is the severely resorbed mandibular ridge,particularly in older individuals with diminished adaptive capacities.This compromised situation leads to the fabrication of inadequate dentures that lack retention and stability,potentially causing psychosocial issues.AIM To determine the difference in retentive capacity between three attachment systems in implant-retained overdentures.METHODS Three edentulous mandibular models were fabricated using heat-cured polymethacrylate resin,with two implant replicas placed in the intra-foraminal region of each model.30 acrylic resin mandibular overdentures were fabricated with provisions for three different overdenture attachment systems:A prefabricated ball/O-ring attachment,a locator attachment system,and an equator attachment system.Each model was subjected to 15000 pulls using a universal testing machine to remove the overdenture from the acrylic model and the force data were recorded.RESULTS The ball/O-ring attachment system demonstrated superior retentive capacity for 15 years,while the locator and equator attachment systems maintained excellent retentive capacity for 5 years.CONCLUSION The ball/O-ring attachment system outperformed better than the other two attachment systems regarding retentive capacity.The locator and equator attachment systems presented sufficient retentive abilities until 15000 cycles.After 7500 cycles,significant differences in retentive force between the systems evolved.展开更多
Background:Childhood environmental unpredictability(CEU)is crucial to personal development,profoundly influence physical and psychological growth particularly,and psychopathy is recognized as a dark personality trait....Background:Childhood environmental unpredictability(CEU)is crucial to personal development,profoundly influence physical and psychological growth particularly,and psychopathy is recognized as a dark personality trait.The aim of this study is to investigate the effects of insecure attachment and life history strategy(LHS)on the relationship between CEU and psychopathy by establishing a sequential mediation model based on evolutionary life history theory and cognitive-affective personality system.Methods:A group of 532 undergraduates completed the measurements for CEU,insecure attachment,LHS,and psychopathy,and Bootstrap mediation test through SPSS 25.0 and PROCESS macro tool was used to examine the relationship among these variables.Results:The results revealed positive relations between CEU and insecure attachment(β=0.87,p<0.001),CEU and LHS(β=0.11,p<0.001),and CEU and psychopathy(β=0.14,p<0.001).Insecure attachment was also positively associated with LHS(β=0.62,p<0.001)and psychopathy(β=0.04,p<0.001).In addition,LHS was significantly associated with psychopathy(β=0.08,p<0.001).The relationship between CEU and psychopathy is mediated independently and sequentially by insecure attachment and LHS.Conclusion:The current research shows the relationship between CEU and psychopathy,as well as the mechanism of insecure attachment and life history strategy as mediators.展开更多
The invasion of host cells by the henipavirus is facilitated through the interaction between viral attachment(G)and fusion(F)glycoproteins with receptors on the cell surface.Langya henipavirus(LayV)was newly identifie...The invasion of host cells by the henipavirus is facilitated through the interaction between viral attachment(G)and fusion(F)glycoproteins with receptors on the cell surface.Langya henipavirus(LayV)was newly identified in China in 2022.The G proteins of LayV and Mojiang virus(MojV)exhibit high amino acid homology(86%),while they are located in a unique evolutionary clade within the Henipavirus genus.In this study,the crystal structure of the LayV G protein was resolved at a 3.37Åresolution,revealing a head domain with sixβ-propeller-like domains distinct from other henipavirus G proteins,such as those of Nipah virus(NiV)and Hendra virus(HeV).Furthermore,the prominent loop in the center cavity of the LayV G protein showed unique structural features.In the ELISA and SPR assays,the LayV G protein was unable to bind to the existing henipavirus-neutralizing antibodies or the ephrin-B2 receptor.Immunogenicity studies in mice demonstrated robust antibody responses elicited by the LayV G protein.These antibodies exhibited strong reactivity against both LayV and MojV G proteins.However,only weak cross-reactivity was observed with other henipaviruses.Moreover,eight monoclonal antibodies targeting the LayV G protein were generated,two of which exhibited broad binding activity across different henipavirus G proteins.These findings underscore the need for tailored vaccines and therapeutics for LayV and related novel henipaviruses.展开更多
This study explores the impact of perceived value,awe,and place attachment on tourists'environmentally responsible behavior(ERB)in desert tourism contexts,using the Singing Sands Mountain and Crescent Spring sceni...This study explores the impact of perceived value,awe,and place attachment on tourists'environmentally responsible behavior(ERB)in desert tourism contexts,using the Singing Sands Mountain and Crescent Spring scenic area in Dunhuang,China as a case study.Data were collected from 315 tourists using a structured questionnaire and analyzed through a structural equation model.Results show that perceived value and awe significantly influence ERB both directly and indirectly via place attachment.Specifically,perceived value has a stronger direct effect on ERB compared to awe,highlighting the importance of tourists'overall evaluation of the destination in promoting sustainable behaviors.The mediating role of place attachment underscores the significance of emotional connections to the environment in fostering ERB.These findings provide valuable insights for sustainable tourism management in fragile desert ecosystems.The study also highlights the importance of enhancing perceived value through high-quality services and leveraging awe-inspiring experiences to promote sustainable behaviors.展开更多
A numerical method is presented to simulate bubble–particle interaction phenomena in particle-laden flows.The bubble surface is represented in an Eulerian framework by a volume-of-fluid(VOF)method,while particle moti...A numerical method is presented to simulate bubble–particle interaction phenomena in particle-laden flows.The bubble surface is represented in an Eulerian framework by a volume-of-fluid(VOF)method,while particle motions are predicted in a Lagrangian framework.Different frameworks for describing bubble surfaces and particles make it difficult to predict the exact locations of collisions between bubbles and particles.An effective bubble,defined as having a larger diameter than the actual bubble represented by the VOFmethod,is introduced to predict the collision locations.Once the collision locations are determined,the attachment of particles to the bubble surface is determined using a novel numerical algorithm based on collision/induction times.The proposed numerical method is validated through simulations of a rising bubble moving through a layer of particles.The validity of the collision detection algorithm is examined by comparing the collision probability predicted by the present numerical method with that predicted from a theoretical relationship based on bubble/particle diameters.The attachment probability predicted by the present algorithm is found to agree well with that of an experiment.展开更多
Background Non-suicidal self-injury(NSSI)is a significant health concern among adolescents and young adults,often resulting from adverse childhood experiences(ACEs).Dissociation,post-traumatic symptoms and attachment ...Background Non-suicidal self-injury(NSSI)is a significant health concern among adolescents and young adults,often resulting from adverse childhood experiences(ACEs).Dissociation,post-traumatic symptoms and attachment style may have a role in shaping such associations.Aims This study aims to provide a unified model of the impact of ACEs on NSSI,exploring complex post-traumatic stress disorder(cPTSD)symptoms and dissociation as potential mediators and the role of the predominant attachment style in affecting such associations.Methods 1010 young individuals attending the last year of high school participated in this cross-sectional study.ACEs,cPTSD,dissociation and NSSI were evaluated using self-report questionnaires.We fitted a path model of NSSI,with ACEs as exogenous variables and cPTSD and dissociation as sequential mediators.Secure,fearful and preoccupied attachment styles were modelled as grouping variables.Results Our findings showed that dissociation mediated the impact of ACEs on NSSI in subjects with a fearful attachment style,as opposed to those with a preoccupied attachment for whom cPTSD symptoms mediated the ACEs-NSSI association.Conclusions Attachment styles moderate the relationship between ACEs and NSSI,with either dissociation or post-traumatic symptomatology mediating the impact of ACEs on NSSI,depending on the predominant attachment style.Our results highlight the importance of attachment as a pathway modifier in the relationships between different psychopathology dimensions,providing a useful framework to better conceptualise the ACEs-NSSI association.展开更多
Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at dif...Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at different conditions were conducted in a single bubble flotation cell. The recovery of cassiterite was found to be affected by cassiterite particle and bubble size. A matching range, in which the best recovery can be obtained, was found between particle and bubble size. Collision, attachment, and detachment of the particle-bubble were observed and captured by a high-speed camera. Particle-bubble collision and attachment were analyzed with the use of particle-bubble interaction theory to obtain the experimental results. An attachment model was introduced and verified through the photos captured by the high-speed camera. A bridge role was observed between the bubbles and particles. Particle-bubble interaction was found to be affected by bubble size and particle size, which significantly influenced not only the collision and attachment behavior of the particles and bubbles but also the flotation recovery of fine cassiterite particles.展开更多
The dissociative electron attachment process for CHCl3 at different electric field have been studied with nitrogen as drift and carrier gas using corona discharge ionization source ion mobility spectrometry （CD-IMS）...The dissociative electron attachment process for CHCl3 at different electric field have been studied with nitrogen as drift and carrier gas using corona discharge ionization source ion mobility spectrometry （CD-IMS）. The corresponding electron attachment rate constants varied from 1.26×10-8 cm3/（molecules s） to 8.24×10-9 cm3/（molecules s） as the electric field changed from 200 V/cm to 500 V/cm. At a fixed electric field in the drift region, the attachment rate constants are also detected at different sample concentration. The ionmolecule reaction rate constants for the further reaction between Cl^- and CHCl3 are also detected, which indicates that the technique maybe becomes a new method to research the rate constants between ions and neural molecules. And the reaction rate constants between Cl- and CHCl3 are the first time detected using CD-IMS.展开更多
The effect of matrix attachment regions (MARs) on foreign gene expression in transgenic plants was studied, The beta-glucuronidase (GUS) gene (uidA) was flanked by the MARs isolated from the genome of maize to form pl...The effect of matrix attachment regions (MARs) on foreign gene expression in transgenic plants was studied, The beta-glucuronidase (GUS) gene (uidA) was flanked by the MARs isolated from the genome of maize to form plant expression vector. The vectors with and without MARs were transferred into tobacco ( Nicotiana tabacum L.) through Agrobacterium-mediated transformation procedure. GUS activity assays indicated that MARs could increase expression level of uidA gene. The mean GUS activity could be increased twofold as compared to that of transformants without MARs, and the highest GUS activity of transformant could reach tenfold. The correspondence between GUS activity and mRNA accumulation was positive and indicated that MARs could improve transcription of foreign gene.展开更多
Octopuses,due to their flexible arms,marvelous adaptability,and powerful suckers,are able to effortlessly grasp and disengage various objects in the marine surrounding without causing devastation.However,manipulating ...Octopuses,due to their flexible arms,marvelous adaptability,and powerful suckers,are able to effortlessly grasp and disengage various objects in the marine surrounding without causing devastation.However,manipulating delicate objects such as soft and fragile foods underwater require gentle contact and stable adhesion,which poses a serious challenge to now available soft grippers.Inspired by the sucker infundibulum structure and flexible tentacles of octopus,herein we developed a hydraulically actuated hydrogel soft gripper with adaptive maneuverability by coupling multiple hydrogen bond-mediated supramolecular hydrogels and vat polymerization three-dimensional printing,in which hydrogel bionic sucker is composed of a tunable curvature membrane,a negative pressure cavity,and a pneumatic chamber.The design of the sucker structure with the alterable curvature membrane is conducive to realize the reliable and gentle switchable adhesion of the hydrogel soft gripper.As a proof-of-concept,the adaptive hydrogel soft gripper is capable of implement diversified underwater tasks,including gingerly grasping fragile foods like egg yolks and tofu,as well as underwater robots and vehicles that station-keeping and crawling based on switchable adhesion.This study therefore provides a transformative strategy for the design of novel soft grippers that will render promising utilities for underwater exploration soft robotics.展开更多
基金supported in part by the Higher Education Sprout Project,Ministry of Education,to the Headquarters of University Advancement at National Cheng Kung University(NCKU).
文摘Background:While various factors contributing to delinquency have been explored,the role of selfesteem in this specific context has received little attention.Hence,this study aims to investigate the complex issue of adolescent delinquency in Iran by focusing on the mediating role of self-esteem in the relationship between parental attachment and delinquent behavior.Methods:Using the multistage cluster random sampling method,the research involved 528 high school students in Tehran.Each student completed validated scales assessing their parental attachment,self-esteem,and delinquency at school.Multiple regression analyses with the Sobel test and bootstrappingmethod were used to examine mediated effects.Results:Thefindings reveal that self-esteem significantly mediates the relationship betweenmaternal attachment and delinquency(standardized coefficient=−0.0292;p=0.04).Adolescents with secure maternal attachments tend to exhibit higher self-esteem,which reduces the likelihood of delinquent behavior.In contrast,paternal attachment did not show a significant mediating effect in this study.These results underscore the importance of cultivating secure maternal relationships and fostering positive self-esteem to address adolescent delinquency.Conclusion:The study suggests that targeted interventions that strengthen maternal attachment and boost self-esteem could effectively mitigate delinquent behaviors among Iranian adolescents.These interventions should prioritize the emotional support and value of secure maternal bonds as key factors in promoting healthy adolescent development.
基金funded by the Shihezi University Innovation and Development Special Project“Research and Application of Knowledge Graph Based Big Data Platform for the Development Trend of College Students’Mental Health”(CXFZSK202205)by the China Young Pioneers Research Topic General Topic(2022YB16).
文摘Objectives:Attachment is a profound and enduring connection to the emotion children progressively form with their parents as they mature.It significantly impacts the social and psychological development of kids and teenagers.This study aimed to explore the latent profiles and longitudinal transition patterns of parent-child and peer attachments among adolescents.Methods:A cohort of 914 participants from China completed the measures with a twelve-month interval.There were 46.8%boys and 53.2%girls in this survey.Latent profile analysis(LPA)was adopted to explore the distinct profiles reflecting different parent-child and peer attachment response patterns at each time point.Latent transition analysis(LTA)was used to examine the membership of distinct latent profiles and how individuals move between profiles over time.Results:Three latent profiles were found:the poor parent-child communication profile,the moderate attachment profile,and the good attachment profile.It was shown that the transition probability from the poor parent-child communication and good attachment profiles to the moderate attachment profile was higher than the transition probability between the poor parent-child communication and good attachment profiles.Patterns of parent-child and peer attachments were associated with depression and anxiety.Conclusion:This study demonstrates differences in adolescents’attachment to fathers,mothers,and peers and the need for targeted interventions for groups of adolescents with moderate levels of parent-child and peer attachment.
基金funded by the Social Science Major Project of Tianjin Municipal Education Commission(Grant No.2025JWZD-GJ26).
文摘Background:Live streaming has become a globally prevalent form of digital entertainment,particularly among young audiences,fostering new modes of online engagement through real-time interaction.However,excessive use may lead to addictive behaviors in certain users.Current research on live-streaming addiction remains limited,with prior studies focusing primarily on socio-psychological drivers rather than the role of technological affordances.To address this gap,this study develops a conceptual model based on socio-technical systems and attachment theory to investigate how emotional and functional attachment mediate the relationship between platform features and addictive behavior.Methods:A total of 533 valid responses were collected in a cross-sectional survey(mean age=26.4 years,standard deviation[SD]=4.7;53.8%female).Data were analyzed using structural equation modeling(SEM)to test the hypothesized relationships.Additionally,the potential mediating effects of emotional and functional attachment between the platform features and live-streaming addiction were examined using the Bootstrap method.Results:Social factors(perceived interactivity,β=0.204,p<0.001;perceived confirmation,β=0.379,p<0.001)and technical factors(perceived customization,β=0.227,p<0.001;perceived amusement,β=0.252,p<0.001;vicarious expression,β=0.352,p<0.001)significantly strengthen both emotional and functional attachment,which in turn positively predict live-streaming addiction(emotional attachment:β=0.468,p<0.001;functional attachment:β=0.393,p<0.001).Furthermore,emotional attachment exerted a stronger influence on addiction than functional attachment.Conclusions:These findings deepen the understanding of live-streaming addiction by integrating socio-technical perspectives and offer practical implications for stakeholders to mitigate negative outcomes through effective strategies.
文摘BACKGROUND The primary issue in managing edentulous patients is the severely resorbed mandibular ridge,particularly in older individuals with diminished adaptive capacities.This compromised situation leads to the fabrication of inadequate dentures that lack retention and stability,potentially causing psychosocial issues.AIM To determine the difference in retentive capacity between three attachment systems in implant-retained overdentures.METHODS Three edentulous mandibular models were fabricated using heat-cured polymethacrylate resin,with two implant replicas placed in the intra-foraminal region of each model.30 acrylic resin mandibular overdentures were fabricated with provisions for three different overdenture attachment systems:A prefabricated ball/O-ring attachment,a locator attachment system,and an equator attachment system.Each model was subjected to 15000 pulls using a universal testing machine to remove the overdenture from the acrylic model and the force data were recorded.RESULTS The ball/O-ring attachment system demonstrated superior retentive capacity for 15 years,while the locator and equator attachment systems maintained excellent retentive capacity for 5 years.CONCLUSION The ball/O-ring attachment system outperformed better than the other two attachment systems regarding retentive capacity.The locator and equator attachment systems presented sufficient retentive abilities until 15000 cycles.After 7500 cycles,significant differences in retentive force between the systems evolved.
基金supported by the Guangdong Basic and Applied Basic Research Foundation(2020A1515110608)Department of Education of Guangdong Province-Guangdong Province General University Youth Innovative Talent Project(2019KQNCX039).
文摘Background:Childhood environmental unpredictability(CEU)is crucial to personal development,profoundly influence physical and psychological growth particularly,and psychopathy is recognized as a dark personality trait.The aim of this study is to investigate the effects of insecure attachment and life history strategy(LHS)on the relationship between CEU and psychopathy by establishing a sequential mediation model based on evolutionary life history theory and cognitive-affective personality system.Methods:A group of 532 undergraduates completed the measurements for CEU,insecure attachment,LHS,and psychopathy,and Bootstrap mediation test through SPSS 25.0 and PROCESS macro tool was used to examine the relationship among these variables.Results:The results revealed positive relations between CEU and insecure attachment(β=0.87,p<0.001),CEU and LHS(β=0.11,p<0.001),and CEU and psychopathy(β=0.14,p<0.001).Insecure attachment was also positively associated with LHS(β=0.62,p<0.001)and psychopathy(β=0.04,p<0.001).In addition,LHS was significantly associated with psychopathy(β=0.08,p<0.001).The relationship between CEU and psychopathy is mediated independently and sequentially by insecure attachment and LHS.Conclusion:The current research shows the relationship between CEU and psychopathy,as well as the mechanism of insecure attachment and life history strategy as mediators.
基金the funding support from the National Natural Science Foundation of China(32200762).
文摘The invasion of host cells by the henipavirus is facilitated through the interaction between viral attachment(G)and fusion(F)glycoproteins with receptors on the cell surface.Langya henipavirus(LayV)was newly identified in China in 2022.The G proteins of LayV and Mojiang virus(MojV)exhibit high amino acid homology(86%),while they are located in a unique evolutionary clade within the Henipavirus genus.In this study,the crystal structure of the LayV G protein was resolved at a 3.37Åresolution,revealing a head domain with sixβ-propeller-like domains distinct from other henipavirus G proteins,such as those of Nipah virus(NiV)and Hendra virus(HeV).Furthermore,the prominent loop in the center cavity of the LayV G protein showed unique structural features.In the ELISA and SPR assays,the LayV G protein was unable to bind to the existing henipavirus-neutralizing antibodies or the ephrin-B2 receptor.Immunogenicity studies in mice demonstrated robust antibody responses elicited by the LayV G protein.These antibodies exhibited strong reactivity against both LayV and MojV G proteins.However,only weak cross-reactivity was observed with other henipaviruses.Moreover,eight monoclonal antibodies targeting the LayV G protein were generated,two of which exhibited broad binding activity across different henipavirus G proteins.These findings underscore the need for tailored vaccines and therapeutics for LayV and related novel henipaviruses.
基金financed by 2024 Gansu Province College Teachers'Innovation Fund Project(2024B-051)Northwest Normal University Young Teachers'Research Ability Enhancement Program Project(NWNU-LKQN2019-25)Grant number Gansu Provincial Social Science Planning Youth Project"Research on the Construction of Tourism Safety Guarantee System for Scenic Spots in Gansu Province"(2021QN008).
文摘This study explores the impact of perceived value,awe,and place attachment on tourists'environmentally responsible behavior(ERB)in desert tourism contexts,using the Singing Sands Mountain and Crescent Spring scenic area in Dunhuang,China as a case study.Data were collected from 315 tourists using a structured questionnaire and analyzed through a structural equation model.Results show that perceived value and awe significantly influence ERB both directly and indirectly via place attachment.Specifically,perceived value has a stronger direct effect on ERB compared to awe,highlighting the importance of tourists'overall evaluation of the destination in promoting sustainable behaviors.The mediating role of place attachment underscores the significance of emotional connections to the environment in fostering ERB.These findings provide valuable insights for sustainable tourism management in fragile desert ecosystems.The study also highlights the importance of enhancing perceived value through high-quality services and leveraging awe-inspiring experiences to promote sustainable behaviors.
基金supported by the National Research Foundation of Korea(NRF)under the Grant Numbers NRF-2021R1A2C2092146 and RS-2023-00282764.
文摘A numerical method is presented to simulate bubble–particle interaction phenomena in particle-laden flows.The bubble surface is represented in an Eulerian framework by a volume-of-fluid(VOF)method,while particle motions are predicted in a Lagrangian framework.Different frameworks for describing bubble surfaces and particles make it difficult to predict the exact locations of collisions between bubbles and particles.An effective bubble,defined as having a larger diameter than the actual bubble represented by the VOFmethod,is introduced to predict the collision locations.Once the collision locations are determined,the attachment of particles to the bubble surface is determined using a novel numerical algorithm based on collision/induction times.The proposed numerical method is validated through simulations of a rising bubble moving through a layer of particles.The validity of the collision detection algorithm is examined by comparing the collision probability predicted by the present numerical method with that predicted from a theoretical relationship based on bubble/particle diameters.The attachment probability predicted by the present algorithm is found to agree well with that of an experiment.
基金supported by #NEXTGENERATIONEU(NGEU)and funded by the Ministry of University and Research(MUR),National Recovery and Resilience Plan(NRRP),project MNESYS(PE0000006)-(DN.155311.10.2022)supported by Sapienza Grant 2021(RM12117A60BDF685).
文摘Background Non-suicidal self-injury(NSSI)is a significant health concern among adolescents and young adults,often resulting from adverse childhood experiences(ACEs).Dissociation,post-traumatic symptoms and attachment style may have a role in shaping such associations.Aims This study aims to provide a unified model of the impact of ACEs on NSSI,exploring complex post-traumatic stress disorder(cPTSD)symptoms and dissociation as potential mediators and the role of the predominant attachment style in affecting such associations.Methods 1010 young individuals attending the last year of high school participated in this cross-sectional study.ACEs,cPTSD,dissociation and NSSI were evaluated using self-report questionnaires.We fitted a path model of NSSI,with ACEs as exogenous variables and cPTSD and dissociation as sequential mediators.Secure,fearful and preoccupied attachment styles were modelled as grouping variables.Results Our findings showed that dissociation mediated the impact of ACEs on NSSI in subjects with a fearful attachment style,as opposed to those with a preoccupied attachment for whom cPTSD symptoms mediated the ACEs-NSSI association.Conclusions Attachment styles moderate the relationship between ACEs and NSSI,with either dissociation or post-traumatic symptomatology mediating the impact of ACEs on NSSI,depending on the predominant attachment style.Our results highlight the importance of attachment as a pathway modifier in the relationships between different psychopathology dimensions,providing a useful framework to better conceptualise the ACEs-NSSI association.
基金Project(50774094)supported by the National Natural Science Foundation of ChinaProject(2011BAB05B01)supported by the National Key Technology Research and Development Program of ChinaProject(2013M542076)supported by the Postdoctoral Science Foundation of China
文摘Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at different conditions were conducted in a single bubble flotation cell. The recovery of cassiterite was found to be affected by cassiterite particle and bubble size. A matching range, in which the best recovery can be obtained, was found between particle and bubble size. Collision, attachment, and detachment of the particle-bubble were observed and captured by a high-speed camera. Particle-bubble collision and attachment were analyzed with the use of particle-bubble interaction theory to obtain the experimental results. An attachment model was introduced and verified through the photos captured by the high-speed camera. A bridge role was observed between the bubbles and particles. Particle-bubble interaction was found to be affected by bubble size and particle size, which significantly influenced not only the collision and attachment behavior of the particles and bubbles but also the flotation recovery of fine cassiterite particles.
基金ACKNOWLEDGMENTS The work was support by the National Natural Science Foundation of China （No.20707025 and No.20907054） and the Excellent Youth Foundation of Anhui Province Scientific Committee （No.06045098）.
文摘The dissociative electron attachment process for CHCl3 at different electric field have been studied with nitrogen as drift and carrier gas using corona discharge ionization source ion mobility spectrometry （CD-IMS）. The corresponding electron attachment rate constants varied from 1.26×10-8 cm3/（molecules s） to 8.24×10-9 cm3/（molecules s） as the electric field changed from 200 V/cm to 500 V/cm. At a fixed electric field in the drift region, the attachment rate constants are also detected at different sample concentration. The ionmolecule reaction rate constants for the further reaction between Cl^- and CHCl3 are also detected, which indicates that the technique maybe becomes a new method to research the rate constants between ions and neural molecules. And the reaction rate constants between Cl- and CHCl3 are the first time detected using CD-IMS.
文摘The effect of matrix attachment regions (MARs) on foreign gene expression in transgenic plants was studied, The beta-glucuronidase (GUS) gene (uidA) was flanked by the MARs isolated from the genome of maize to form plant expression vector. The vectors with and without MARs were transferred into tobacco ( Nicotiana tabacum L.) through Agrobacterium-mediated transformation procedure. GUS activity assays indicated that MARs could increase expression level of uidA gene. The mean GUS activity could be increased twofold as compared to that of transformants without MARs, and the highest GUS activity of transformant could reach tenfold. The correspondence between GUS activity and mRNA accumulation was positive and indicated that MARs could improve transcription of foreign gene.
基金the financial support from the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB0470303)the National Key Research and Development Program of China (2022YFB4600101)+5 种基金the National Natural Science Foundation of China (52175201)the Research Program of Science and Technology Department of Gansu Province (24JRRA059, 24JRRA044, and 24YFFA014)the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai (AMGM2024F12)the Major Program (ZYFZFX-2) of the Lanzhou Institute of Chemical Physics, CASthe Special Research Assistant Project of the Chinese Academy of Sciencesthe Oasis Scholar of Shihezi University
文摘Octopuses,due to their flexible arms,marvelous adaptability,and powerful suckers,are able to effortlessly grasp and disengage various objects in the marine surrounding without causing devastation.However,manipulating delicate objects such as soft and fragile foods underwater require gentle contact and stable adhesion,which poses a serious challenge to now available soft grippers.Inspired by the sucker infundibulum structure and flexible tentacles of octopus,herein we developed a hydraulically actuated hydrogel soft gripper with adaptive maneuverability by coupling multiple hydrogen bond-mediated supramolecular hydrogels and vat polymerization three-dimensional printing,in which hydrogel bionic sucker is composed of a tunable curvature membrane,a negative pressure cavity,and a pneumatic chamber.The design of the sucker structure with the alterable curvature membrane is conducive to realize the reliable and gentle switchable adhesion of the hydrogel soft gripper.As a proof-of-concept,the adaptive hydrogel soft gripper is capable of implement diversified underwater tasks,including gingerly grasping fragile foods like egg yolks and tofu,as well as underwater robots and vehicles that station-keeping and crawling based on switchable adhesion.This study therefore provides a transformative strategy for the design of novel soft grippers that will render promising utilities for underwater exploration soft robotics.
