Reporter: We are delighted to be given an opportunity to interview Madam Huang when China Expo Forum for International Cooperation (CEFCO) is approaching. Mayor Huang, would you please offer an introduction to exhibit...Reporter: We are delighted to be given an opportunity to interview Madam Huang when China Expo Forum for International Cooperation (CEFCO) is approaching. Mayor Huang, would you please offer an introduction to exhibition development in Xia’men?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
The concept of matching energy was proposed by Gutman and Wagner firstly in 2012. Let G be a simple graph of order n and λ1, λ2, . . . , λn be the zeros of its matching polynomial. The matching energy of a graph G ...The concept of matching energy was proposed by Gutman and Wagner firstly in 2012. Let G be a simple graph of order n and λ1, λ2, . . . , λn be the zeros of its matching polynomial. The matching energy of a graph G is defined as ME(G) = Pni=1 |λi|. By the famous Coulson’s formula, matching energies can also be calculated by an improper integral depending on a parameter. A k-claw attaching graph Gu(k) refers to the graph obtained by attaching k pendent edges to the graph G at the vertex u, where u is called the root of Gu(k). In this paper, we use some theories of mathematical analysis to obtain a new technique to compare the matching energies of two k-claw attaching graphs Gu(k) and Hv(k) with the same order, that is, limk→∞[ME(Gu(k)) − ME(Hv(k))] = ME(G − u) − ME(H − v). By the technique, we finally determine unicyclic graphs of order n with the 9th to 13th minimal matching energies for all n ≥ 58.展开更多
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
Jellyfish outbreaks are severely exacerbated by coastal eutrophication,overfishing,and aquaculture.Jellyfish proliferation has been shown closely connected with larval populations during the early stages of their life...Jellyfish outbreaks are severely exacerbated by coastal eutrophication,overfishing,and aquaculture.Jellyfish proliferation has been shown closely connected with larval populations during the early stages of their life cycle.However,the factors affecting larval populations have not been fully explored.The changes in metabolites during the transition from planula larvae to polyps were analyzed using ultra-performance liquid chromatography coupled with a mass spectrometer.In jellyfish planula larvae and polyps,lipids and lipid-like molecules are the most abundant metabolites,followed by organic acids and their derivatives,organic heterocyclic compounds,and organic oxygen compounds.In comparison with planula larvae,13 metabolites were significantly increased while 212 were significantly decreased.Most of these metabolites are involved in lipid metabolism,amino acids metabolism,and nucleotide metabolism.Furthermore,during the jellyfish planula larvae metamorphosis and settlement,five differentially expressed metabolites were identified as candidate metabolites that facilitate larvae attachment and metamorphosis,including glycerol lactate pyruvate,N-stearoyl asparagine,4-methyl-umbelliferyl-N-acetyl-chitobiose,levetiracetam,and 4-amino-1-[(2 R,5 R)-5-(hydroxymethyl)-4-sulfanyloxolan-2-yl]pyrimidin-2-one.This study identified the metabolites and helped understand the metabolic mechanisms underlying the attachment and metamorphosis of jellyfish larvae,which expands our knowledge of jellyfish blooming at the early life stage.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
Plate culture counting and strain isolation methods were utilized to assess the species richness and abundance of planktonic and attached bacteria on glass plates in the surface and bottom seawater of Qingdao Middle H...Plate culture counting and strain isolation methods were utilized to assess the species richness and abundance of planktonic and attached bacteria on glass plates in the surface and bottom seawater of Qingdao Middle Harbor over a year,with monthly and quarterly sampling.Both species richness and bacterial numbers exhibited seasonal variations.Specifically,the abundance of attached bacteria and bacterioplankton peaked in June and July,corresponding to higher water temperatures in summer and autumn,while lower abundances were noted in January and December during cooler periods.Throughout the year,the species richness of attached bacteria consistently exceeded that of planktonic bacteria in both shallow and deep waters.Pseudoalteromonas emerged as the most prevalent genus among both planktonic and attached bacteria in surface and bottom seawater samples.Furthermore,the magnitude of changes in species richness and abundance for attached bacteria(0.66×10^(5)-15.85×10^(5)CFU/cm^(2))was greater than that observed for planktonic bacteria(0.58×10^(8)-5.33×10^(8)CFU/L).We propose that the attached bacterial populations,situated in limited microenvironments within the larger seawater ecosystem,exhibit heightened sensitivity to environmental fluctuations,resulting in more rapid shifts in population dynamics and lower ecological stability.The theoretical implications and potential applications of these findings warrant further investigation.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
Concrete is subject to the synergistic effects of physical,chemical and biological processes throughout its life cycle.Among them,the corrosion of concrete by physical and chemical effects has been studied in detail.W...Concrete is subject to the synergistic effects of physical,chemical and biological processes throughout its life cycle.Among them,the corrosion of concrete by physical and chemical effects has been studied in detail.With the advance of various basic engineering facilities to the ocean,the deterioration mechanism of concrete caused by Marine fouling organisms remains to be studied.In particular,the corrosion and damage of Marine concrete by algae have rarely been reported by scholars.Therefore,combined with the current research status,we will review the mechanism of algal corrosion,the damage effect of algal adhesion on concrete and its interior,the factors affecting algal adhesion behavior,and the protection technology of algal adhesion.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
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
The prevalence of cardiometabolic syndrome(CMS)and increasing mortality rate play a significant role in the global increase of cardiovascular disease(CVD)in developing countries.A group of metabolic syndromes that are...The prevalence of cardiometabolic syndrome(CMS)and increasing mortality rate play a significant role in the global increase of cardiovascular disease(CVD)in developing countries.A group of metabolic syndromes that are risk factors for CVDs are referred to as the CMS.Although the exact mechanism(s)behind the development of the CMS are not known,but multi-organ insulin resistance,a prevalent characteristic of the syndrome,is probably one of them.The two most prevalent dental diseases i.e.periodontitis(PD)and dental caries have been re-lated to several systemic diseases and disorders,such as CMS.Age,alcohol con-sumption,being obese,possessing diabetes,as well as smoking are risk factors for periodontal diseases,while both CVD and periodontal diseases are linked to systemic inflammation.It has a multifactorial aetiology and is associated with many systemic diseases.When bacteria and their products attack the periodontal tissues,the tissue raises an immune-inflammatory response against the patho-gens.This acute phase response is a result of the pathogen’s systemic attack and contributes to the overall inflammatory burden of the system.CVD and PD are both diseases associated with systemic inflammation and may be related as they share many common risk factors.Hence,the correlation between these conditions might also have an impact on how dentistry and medicine are practised,thus helping to build a working relationship between the dentist and the physician.展开更多
Since the end of the Cold War,the core goal of U.S.policy toward Africa has been to build its influence on the continent through development assistance and trade preferences attached with political conditionalities,de...Since the end of the Cold War,the core goal of U.S.policy toward Africa has been to build its influence on the continent through development assistance and trade preferences attached with political conditionalities,defined as“assistance for concessions”.After the September 11 attacks,counterterrorism became a priority in U.S.national security strategy,being one of the three pillars of U.S.policy toward Africa alongside assistance and trade.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
Extracellular polymeric substances （EPS） were extracted from Acidithiobacillus ferrooxidans through sonication method associated with centrifugation, which was evaluated tentatively with 2-keto-3-deoxyoctonic acid ...Extracellular polymeric substances （EPS） were extracted from Acidithiobacillus ferrooxidans through sonication method associated with centrifugation, which was evaluated tentatively with 2-keto-3-deoxyoctonic acid （KDO） as the indicator of EPS by spectrophotometry. Then the effect of EPS of A. ferrooxidans on the adhesion on chalcopyrite and pyrite surfaces was studied through a series of comparative experiments. The untreated cells and EPS-free cells of A. ferrooxidans were mixed with EPS suspension, Fe^2＋ or Fe^3＋, respectively. The planktonic cells were monitored in 2 h during bioleaching. The results indicate that the presence of EPS on the cell is an important factor for the adhesion to chalcopyrite and pyrite. A decrease of attachment of A. ferrooxidans to minerals was produced by the deficiency of EPS, which can recover mostly when the EPS was re-added into the EPS-free cells. The restoring extent is more obvious in pyrite than in chalcopyrite. The extent of cell adhesion to chalcopyrite increased when EPS and Fe^3＋ added, and decreased when Fe^2＋ added, which imply the electrostatic interaction plays a main role in initial adhesion between bacteria and minerals and it is a driving force for bacteria to produce EPS probably as a result of regaining their attachment ability to copper sulphides.展开更多
The authors used suspension cells of Populus euphratica to isolate protoplast in the present study. Protoplasts were successfully obtained after 4 hours incubation in enzyme solution containing 1 0% cellulase “o...The authors used suspension cells of Populus euphratica to isolate protoplast in the present study. Protoplasts were successfully obtained after 4 hours incubation in enzyme solution containing 1 0% cellulase “onozuka” R\|10, 0\^01% pectolyase Y\|23,0\^15% macerozyme R\|10 and 0\^1% hemicellulase at 25℃. Outward and inward single channels in plasma membrane were observed using cell\|attached recording of patch\|clamp technique. In this study, single channel records showed that more than one species of channel were obtained. These attempts in protoplast isolation and ion channel recording offers the opportunity to characterize cellular mechanisms of salt tolerance in tree species.展开更多
文摘Reporter: We are delighted to be given an opportunity to interview Madam Huang when China Expo Forum for International Cooperation (CEFCO) is approaching. Mayor Huang, would you please offer an introduction to exhibition development in Xia’men?
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.
基金Supported by the National Natural Science Foundation of China(Nos.12271439,11871398)the National College Students Innovation and Entrepreneurship Training Program(No.201910699173)。
文摘The concept of matching energy was proposed by Gutman and Wagner firstly in 2012. Let G be a simple graph of order n and λ1, λ2, . . . , λn be the zeros of its matching polynomial. The matching energy of a graph G is defined as ME(G) = Pni=1 |λi|. By the famous Coulson’s formula, matching energies can also be calculated by an improper integral depending on a parameter. A k-claw attaching graph Gu(k) refers to the graph obtained by attaching k pendent edges to the graph G at the vertex u, where u is called the root of Gu(k). In this paper, we use some theories of mathematical analysis to obtain a new technique to compare the matching energies of two k-claw attaching graphs Gu(k) and Hv(k) with the same order, that is, limk→∞[ME(Gu(k)) − ME(Hv(k))] = ME(G − u) − ME(H − v). By the technique, we finally determine unicyclic graphs of order n with the 9th to 13th minimal matching energies for all n ≥ 58.
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.
基金Supported by the National Natural Science Foundation of China(NSFC)-Shandong Joint Fund(No.U 2106208)the NSFC(No.41976147)the Doctoral Fund of Yantai University(No.2222017)。
文摘Jellyfish outbreaks are severely exacerbated by coastal eutrophication,overfishing,and aquaculture.Jellyfish proliferation has been shown closely connected with larval populations during the early stages of their life cycle.However,the factors affecting larval populations have not been fully explored.The changes in metabolites during the transition from planula larvae to polyps were analyzed using ultra-performance liquid chromatography coupled with a mass spectrometer.In jellyfish planula larvae and polyps,lipids and lipid-like molecules are the most abundant metabolites,followed by organic acids and their derivatives,organic heterocyclic compounds,and organic oxygen compounds.In comparison with planula larvae,13 metabolites were significantly increased while 212 were significantly decreased.Most of these metabolites are involved in lipid metabolism,amino acids metabolism,and nucleotide metabolism.Furthermore,during the jellyfish planula larvae metamorphosis and settlement,five differentially expressed metabolites were identified as candidate metabolites that facilitate larvae attachment and metamorphosis,including glycerol lactate pyruvate,N-stearoyl asparagine,4-methyl-umbelliferyl-N-acetyl-chitobiose,levetiracetam,and 4-amino-1-[(2 R,5 R)-5-(hydroxymethyl)-4-sulfanyloxolan-2-yl]pyrimidin-2-one.This study identified the metabolites and helped understand the metabolic mechanisms underlying the attachment and metamorphosis of jellyfish larvae,which expands our knowledge of jellyfish blooming at the early life stage.
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The National Natural Science Foundation of China under contract Nos 42206126 and 42076044the Natural Science Foundation of Shandong Province under contract No.ZR2021QD099.
文摘Plate culture counting and strain isolation methods were utilized to assess the species richness and abundance of planktonic and attached bacteria on glass plates in the surface and bottom seawater of Qingdao Middle Harbor over a year,with monthly and quarterly sampling.Both species richness and bacterial numbers exhibited seasonal variations.Specifically,the abundance of attached bacteria and bacterioplankton peaked in June and July,corresponding to higher water temperatures in summer and autumn,while lower abundances were noted in January and December during cooler periods.Throughout the year,the species richness of attached bacteria consistently exceeded that of planktonic bacteria in both shallow and deep waters.Pseudoalteromonas emerged as the most prevalent genus among both planktonic and attached bacteria in surface and bottom seawater samples.Furthermore,the magnitude of changes in species richness and abundance for attached bacteria(0.66×10^(5)-15.85×10^(5)CFU/cm^(2))was greater than that observed for planktonic bacteria(0.58×10^(8)-5.33×10^(8)CFU/L).We propose that the attached bacterial populations,situated in limited microenvironments within the larger seawater ecosystem,exhibit heightened sensitivity to environmental fluctuations,resulting in more rapid shifts in population dynamics and lower ecological stability.The theoretical implications and potential applications of these findings warrant further investigation.
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Funded by the National Natural Science Foundation of China(Nos.52278269,52278268,and 52178264)the Tianjin Outstanding Young Scholars Science Fund Project(No.22JCJQJC00020)+1 种基金the Key Project of Tianjin Natural Science Foundation(No.23JCZDJC00430)the Joint Research Center of China and Foreign Countries Special Fund of Tianjin Innovation Platform(No.24PTLYHZ00240)。
文摘Concrete is subject to the synergistic effects of physical,chemical and biological processes throughout its life cycle.Among them,the corrosion of concrete by physical and chemical effects has been studied in detail.With the advance of various basic engineering facilities to the ocean,the deterioration mechanism of concrete caused by Marine fouling organisms remains to be studied.In particular,the corrosion and damage of Marine concrete by algae have rarely been reported by scholars.Therefore,combined with the current research status,we will review the mechanism of algal corrosion,the damage effect of algal adhesion on concrete and its interior,the factors affecting algal adhesion behavior,and the protection technology of algal adhesion.
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.
文摘The prevalence of cardiometabolic syndrome(CMS)and increasing mortality rate play a significant role in the global increase of cardiovascular disease(CVD)in developing countries.A group of metabolic syndromes that are risk factors for CVDs are referred to as the CMS.Although the exact mechanism(s)behind the development of the CMS are not known,but multi-organ insulin resistance,a prevalent characteristic of the syndrome,is probably one of them.The two most prevalent dental diseases i.e.periodontitis(PD)and dental caries have been re-lated to several systemic diseases and disorders,such as CMS.Age,alcohol con-sumption,being obese,possessing diabetes,as well as smoking are risk factors for periodontal diseases,while both CVD and periodontal diseases are linked to systemic inflammation.It has a multifactorial aetiology and is associated with many systemic diseases.When bacteria and their products attack the periodontal tissues,the tissue raises an immune-inflammatory response against the patho-gens.This acute phase response is a result of the pathogen’s systemic attack and contributes to the overall inflammatory burden of the system.CVD and PD are both diseases associated with systemic inflammation and may be related as they share many common risk factors.Hence,the correlation between these conditions might also have an impact on how dentistry and medicine are practised,thus helping to build a working relationship between the dentist and the physician.
文摘Since the end of the Cold War,the core goal of U.S.policy toward Africa has been to build its influence on the continent through development assistance and trade preferences attached with political conditionalities,defined as“assistance for concessions”.After the September 11 attacks,counterterrorism became a priority in U.S.national security strategy,being one of the three pillars of U.S.policy toward Africa alongside assistance and trade.
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Project (2010CB630901) supported by the National Basic Research Program of ChinaProject (50621063) supported by the National Natural Science Foundation of China
文摘Extracellular polymeric substances （EPS） were extracted from Acidithiobacillus ferrooxidans through sonication method associated with centrifugation, which was evaluated tentatively with 2-keto-3-deoxyoctonic acid （KDO） as the indicator of EPS by spectrophotometry. Then the effect of EPS of A. ferrooxidans on the adhesion on chalcopyrite and pyrite surfaces was studied through a series of comparative experiments. The untreated cells and EPS-free cells of A. ferrooxidans were mixed with EPS suspension, Fe^2＋ or Fe^3＋, respectively. The planktonic cells were monitored in 2 h during bioleaching. The results indicate that the presence of EPS on the cell is an important factor for the adhesion to chalcopyrite and pyrite. A decrease of attachment of A. ferrooxidans to minerals was produced by the deficiency of EPS, which can recover mostly when the EPS was re-added into the EPS-free cells. The restoring extent is more obvious in pyrite than in chalcopyrite. The extent of cell adhesion to chalcopyrite increased when EPS and Fe^3＋ added, and decreased when Fe^2＋ added, which imply the electrostatic interaction plays a main role in initial adhesion between bacteria and minerals and it is a driving force for bacteria to produce EPS probably as a result of regaining their attachment ability to copper sulphides.
文摘The authors used suspension cells of Populus euphratica to isolate protoplast in the present study. Protoplasts were successfully obtained after 4 hours incubation in enzyme solution containing 1 0% cellulase “onozuka” R\|10, 0\^01% pectolyase Y\|23,0\^15% macerozyme R\|10 and 0\^1% hemicellulase at 25℃. Outward and inward single channels in plasma membrane were observed using cell\|attached recording of patch\|clamp technique. In this study, single channel records showed that more than one species of channel were obtained. These attempts in protoplast isolation and ion channel recording offers the opportunity to characterize cellular mechanisms of salt tolerance in tree species.
