Healthy behavior has long been linked to mental health outcomes.However,the role of artificial intelligence(AI)literacy in shaping healthy behaviors and its potential impact on mental health remains underexplored.This...Healthy behavior has long been linked to mental health outcomes.However,the role of artificial intelligence(AI)literacy in shaping healthy behaviors and its potential impact on mental health remains underexplored.This paper presents a scoping review offering a novel perspective on the intersection of healthy behaviors,mental health,and AI literacy.By examining how individuals’understanding of AI influences their choices regarding nutrition and their susceptibility to mental health issues,the current study explores emerging trends in health behavior decision-making.This emphasizes the need for integrating AI literacy into mental health and health behaviors education,as well as the development of AI-driven tools to support healthier behavior choices.It highlights that individuals with low AI literacy may misinterpret or overly depend on AI guidance,resulting in maladaptive health choices,while those with high AI literacy may be more likely to engage reflectively and sustain positive behaviors.The paper outlines the importance of inclusive education,user-centered design,and community-based support systems to enhance AI literacy for digitally marginalized groups.AI literacy may be positioned as a key determinant of health equity,better allowing for interdisciplinary strategies that empower individuals to make informed,autonomous decisions that promote both physical and mental health.展开更多
The comprehension of universal thermodynamic behaviors in the supercritical region is crucial for examining the characteristics of black hole systems under high temperature and pressure.This study is devoted to the an...The comprehension of universal thermodynamic behaviors in the supercritical region is crucial for examining the characteristics of black hole systems under high temperature and pressure.This study is devoted to the analysis of characteristic lines and crossover behaviors within the supercritical region.By making use of the free energy,we introduce three key thermodynamic quantities:scaled variance,skewness,and kurtosis.Our results demonstrate that the Widom line,associated with the maximal scaled variance,can effectively differentiate between small and large black hole-like subphases,each displaying distinct thermodynamic behaviors within the supercritical region.Furthermore,by utilizing quasinormal modes,we identify the Frenkel line,offering a dynamic perspective to distinguish between small and large black hole-like subphases.These contribute to a deeper comprehension of black hole subphases in the supercritical region,thus illuminating new facets of black hole thermodynamics.展开更多
This study aims to explore the characteristics of novice teachers’inappropriate behaviors in classroom teaching and their intervention strategies.With the continuous improvement of education quality,novice teachers f...This study aims to explore the characteristics of novice teachers’inappropriate behaviors in classroom teaching and their intervention strategies.With the continuous improvement of education quality,novice teachers face increasing challenges in teaching practice.Their inappropriate behaviors not only affect the classroom atmosphere but may also negatively impact students’learning outcomes.Therefore,researching the characteristics of novice teachers’inappropriate behaviors and their intervention strategies holds significant scientific and social value.This study employs a combination of quantitative and qualitative methods to analyze the behavioral patterns of novice teachers in classroom teaching and proposes corresponding intervention strategies.The results indicate that novice teachers’inappropriate behaviors mainly manifest as poor classroom management,monotonous teaching methods,and insufficient interaction with students.Based on these findings,the study proposes a series of effective intervention strategies,including enhancing teacher training,optimizing teaching design,and promoting positive interactions between teachers and students.The conclusions of the study not only provide practical guidance for educational practice but also point out directions for future research,emphasizing the crucial role of teacher professional development in improving teaching quality.展开更多
A series of true triaxial unloading tests are conducted on sandstone specimens with a single structural plane to investigate their mechanical behaviors and failure characteristics under different in situ stress states...A series of true triaxial unloading tests are conducted on sandstone specimens with a single structural plane to investigate their mechanical behaviors and failure characteristics under different in situ stress states.The experimental results indicate that the dip angle of structural plane(θ)and the intermediate principal stress(σ2)have an important influence on the peak strength,cracking mode,and rockburst severity.The peak strength exhibits a first increase and then decrease as a function ofσ2 for a constantθ.However,whenσ2 is constant,the maximum peak strength is obtained atθof 90°,and the minimum peak strength is obtained atθof 30°or 45°.For the case of an inclined structural plane,the crack type at the tips of structural plane transforms from a mix of wing and anti-wing cracks to wing cracks with an increase inσ2,while the crack type around the tips of structural plane is always anti-wing cracks for the vertical structural plane,accompanied by a series of tensile cracks besides.The specimens with structural plane do not undergo slabbing failure regardless ofθ,and always exhibit composite tensile-shear failure whatever theσ2 value is.With an increase inσ2 andθ,the intensity of the rockburst is consistent with the tendency of the peak strength.By analyzing the relationship between the cohesion(c),internal friction angle(φ),andθin sandstone specimens,we incorporateθinto the true triaxial unloading strength criterion,and propose a modified linear Mogi-Coulomb criterion.Moreover,the crack propagation mechanism at the tips of structural plane,and closure degree of the structural plane under true triaxial unloading conditions are also discussed and summarized.This study provides theoretical guidance for stability assessment of surrounding rocks containing geological structures in deep complex stress environments.展开更多
Layered rock formations are frequently encountered during the excavation of underground structures. The stability of such structures is influenced not only by the stress concentration caused by the cavities in the str...Layered rock formations are frequently encountered during the excavation of underground structures. The stability of such structures is influenced not only by the stress concentration caused by the cavities in the strata but also by the anisotropy of the layered rock mass. The interaction between them can lead to critical structural failure, such as rupture, collapse, or significant deformation within the adjacent rock mass, thereby jeopardizing operational safety. However, the coupling law and mechanism between the stress concentration resulting from the cavities and the anisotropy of a layered rock mass remain unclear. In this study, a uniaxial compression test was performed on shale specimens containing a circular hole to investigate the effects of layer inclination and circular holes on the mechanical properties, elastic energy storage, and failure behaviors of these specimens. The failure mechanism of the rock surrounding the hole was analyzed on the basis of the single plane of weakness theory and the Kirsch solution. The test results indicated pronounced anisotropy in the compressive strength, elastic modulus, and elastic strain energy of the specimens, with distinct “V”, “M” and “U”-shaped patterns correlated with varying layer inclination angles. In addition, the combined effect of stress concentration and layer inclination resulted in different failure types, which were classified into four groups according to their failure behavior. Theoretical analysis revealed that failure around circular holes in layered rock is affected by a range of variables, such as layer inclination, layer strength, lateral pressure coefficient, azimuth, and loading stress.展开更多
In the deep geological disposal repository of high-level radioactive waste,buffer/backfill materials typically consist of compacted bentonite block and granular bentonite.As these materials undergo a long-term hydrati...In the deep geological disposal repository of high-level radioactive waste,buffer/backfill materials typically consist of compacted bentonite block and granular bentonite.As these materials undergo a long-term hydration,it is anticipated that the two forms of bentonite materials(i.e.compacted bentonite powder(CBP)and granular bentonite(GB))are expected to exhibit differing hydro-mechanical behaviors due to the differences in their structures.This work aims to investigate the differences in swelling pressure and compressibility through a series of swelling pressure tests,compression tests and mercury intrusion porosimetry(MIP)tests.The experimental results demonstrated that swelling pressure curves of the CBP specimens showed higher first peak values and more pronounced collapse than those of the GB specimens at a given dry density,regardless of vapor-water hydration or liquid-water hydration.The final swelling pressures of the two materials were similar at the same dry density,suggesting an independent correlation between swelling pressure and dry density.At the high suction range,the compression curves exhibited an obvious bi-linear pattern for the CBP specimens and a significant nonlinearity for the GB specimens.Meanwhile,the CBP specimens presented higher pre-consolidation pressures and larger compression indices than the GB specimens at a given suction.As suction decreased,the compression curves of the two materials gradually approached each other and their differences were reduced accordingly.After reaching saturation,a good consistency between them was observed whether for final swelling pressure or compressibility.Pore structure analysis revealed that the two materials both presented an initially double structure,and their differences were primarily manifested at the macrostructural level.Eventually,the differences in swelling pressure or compression curves of the two materials were well interpreted by combining microstructural evolutions.展开更多
ⅢThe superior adaptability of Prussian blue analogues(PBAs)in interacting with potassium ions has shifted research focus toward their potential application as cathodes of potassium-ion batteries(PIBs).The large inter...ⅢThe superior adaptability of Prussian blue analogues(PBAs)in interacting with potassium ions has shifted research focus toward their potential application as cathodes of potassium-ion batteries(PIBs).The large interstitial space formed between metal ions and–C≡N–in PBAs can accommodate large-radius K^(+).However,the rapid nucleation in the co-precipitation synthesis process of PBAs induces many lattice defects of[M(CN)_(6)]^(4-)vacancies(V_([M–C≡N])),interstitial and coordinated H_(2)O molecules,which will directly lead to performance degradation.Moreover,originating from various transition metal elements in low/high-spin electron configuration states,PBAs exhibit diverse electrochemical behaviors,such as low reaction kinetics of low-spin iron(Ⅱ),Jahn-Teller distortion and dissolution of manganese(Ⅲ),and electrochemical inertness of nickel(Ⅱ)and copper(Ⅱ).Here,we summarize recently reported structures and properties of PBAs,classifying them based on the types of transition metals(iron,cobalt,manganese,copper,nickel)employed.Advanced synthesis strategies,including control engineering of crystallinity based on H_(2)O molecules and V_([M–C≡N]),were discussed.Also,the approaches for enhancing the electrochemical performance of PBAs were highlighted.Finally,the challenges and prospects towards the future development of PBAs are put forward.The review is expected to provide technical and theoretical support for the design of high-performance PBAs.展开更多
Four powder metallurgy(PM)Ni-based superalloys with different Hf and Ta contents were creep-tested at 650℃ and 970 MPa,700℃ and 770 MPa,and 750℃ and 580 MPa,respectively.The effect of Hf and Ta on creep deformation...Four powder metallurgy(PM)Ni-based superalloys with different Hf and Ta contents were creep-tested at 650℃ and 970 MPa,700℃ and 770 MPa,and 750℃ and 580 MPa,respectively.The effect of Hf and Ta on creep deformation behaviors of the superalloys was studied from multiple scales by SEM,electron backscatter diffraction(EBSD),and aberration-corrected scanning transmission electron microscope(AC-STEM).The results showed that Hf and Ta suppressed the intergranular fracture and initiation of cracks during the acceleration creep stage,which prolonged the creep rupture time.Hf and Ta inhibited the stacking faults extending and the dislocation climbing and promoted the Suzuki segregation of W during the steady-state creep stage,which reduced the minimum creep rate and delayed the start time of the acceleration creep stage.The Suzuki segregation of Co,Cr,Mo,Ti,Nb,W,and Ta along stacking faults was observed after Hf and Ta addition,leading to the localized phase transformation in the γ′phase,and the stacking fault phase was chemically disordered.This study provided ideas for the composition design of novel PM Ni-based superalloys and theoretical foundations for the combined addition of Hf and Ta.展开更多
This paper examines the travel behaviors of hand-foot-and-mouth disease(HFMD)patients in Nanchang City in central China.Based on the HFMD patients’hospital visitation data from the Center of Disease Control(CDC)of Na...This paper examines the travel behaviors of hand-foot-and-mouth disease(HFMD)patients in Nanchang City in central China.Based on the HFMD patients’hospital visitation data from the Center of Disease Control(CDC)of Nanchang in 2018,a spatial network of patient-to-hospital trip flows is constructed.A Geographic Information Systems(GIS)automated network community detec-tion method,termed‘ScLeiden’,is utilized to delineate the study area into six hospital service areas(HSAs)to represent distinctive health care markets.Patients’travel patterns across these HSAs are compared to highlight the geographic disparity.In two HSAs anchored by major hospitals in the regions,the volume of patients increased up to a travel range and then declined,and thus formed a single peak in the trip volume distribution curve across travel time.Each of the remaining four HSAs exhibited two or more peaks in their trip volume distribution curves.The patterns reflected the split choices of patients for the largest Children Hospital in the region,the second-tier county hospital,or others,which were likely to be stratified by their economic affordability,transportation means,and possible health literacy.The study provides valuable insights into the delineation of HSAs and the unique patients’travel behaviors in China.展开更多
This study explored the dynamic behaviors and fracturing mechanisms of flawed granite under split-Hopkinson pressure bar testing,focusing on factors like grain size and flaw dimensions.By means of digital image proces...This study explored the dynamic behaviors and fracturing mechanisms of flawed granite under split-Hopkinson pressure bar testing,focusing on factors like grain size and flaw dimensions.By means of digital image processing and the discrete element method,Particle Flow Code 2D(PFC2D)models were constructed based on real granite samples,effectively overcoming the limitations of prior studies that mainly relied on randomized parameters.The results illustrate that the crack distribution of granite is significantly influenced by grain size and flaw dimensions.Tension cracks predominate and mineral boundaries,such as between feldspar and quartz,become primary crack sites.Both flaw length and width critically affect the crack density,distribution,and dynamic strength of granite.Specifically,dynamic strength tends to decrease with the enlargement of flaws and increase with an increase in flaw angles up to 90°.展开更多
This study tested a multilevel model of the workplace territorial behaviors and employees’knowledge sharing relationship,with team identification serving as a mediator and task interdependence as a moderator.Data wer...This study tested a multilevel model of the workplace territorial behaviors and employees’knowledge sharing relationship,with team identification serving as a mediator and task interdependence as a moderator.Data were collected from 253 employees(females=128,mean age=28.626,SD=6.470)from 40 work teams from different industries in China.Path analysis results indicated that workplace territorial behaviors were associated with lower employee knowledge sharing.Team identification enhanced employee knowledge sharing and partially mediated the relationship between workplace territorial behaviors and employee knowledge sharing.Task interdependence enhanced knowledge sharing and strengthened the relationship between team identification and knowledge sharing.Thesefindings extend the proposition of social information processing theory by revealing the mediating role of team identification in the relationship between workplace territorial behaviors and knowledge sharing,and clarifying the boundary conditions of team identification.Practical implications of thesefindings include a need for managers to foster collaborative atmospheres,design interdependent tasks,and mitigate territorial behaviors to enhance team identification and knowledge sharing.展开更多
With the widespread adoption of smartphones,parental phubbing behaviors have become increasingly prevalent,potentially affecting preschool children’s development.Current research primarily focuses on adolescent popul...With the widespread adoption of smartphones,parental phubbing behaviors have become increasingly prevalent,potentially affecting preschool children’s development.Current research primarily focuses on adolescent populations,while the mechanisms through which parental phubbing and authoritarian parenting style influence preschool children’s behavioral problems within the Chinese cultural context remain to be explored.Our investigation seeks to examine the factors contributing to behavioral difficulties among children of preschool age and provide theoretical guidance for prevention.Methods In our research,we utilized a convenience sampling approach to collect data from parents whose children(n=612)were between 3 and 7 years of age.The questionnaire distribution was facilitated via the Wenjuanxing online survey platform.Research instruments included the Parental Phubbing Scale,Parent-Child Relationship Scale,Authoritarian Parenting Style Scale,and Conners Child Behavior Rating Scale.For analytical procedures,we employed SPSS 24.0 to generate descriptive statistics and correlation analysis.Chain mediation effects were examined via Process macro,while significance assessment of the mediating effects relied on the Bootstrap method for constructing 95%confidence intervals.Results A statistically significant positive association was observed between parental phubbing and behavioral problems exhibited by children(r=0.251,p<0.001).Parental phubbing exhibited a significant direct effect on children’s behavioral problems(β=0.088,p<0.001).Analysis of sequential mediation demonstrated that authoritarian parenting style together with parent-child conflict functioned as significant intermediary variables in the relationship between parental phubbing and children’s problem behaviors(β=0.163,p<0.001),with these indirect pathways constituting 64.94%of the total effect.Conclusion Parental phubbing significantly contributes to behavioral problems in preschool children.Parents should monitor their media use,improve their parenting approach,and enhance parent-child relationships to reduce behavioral problems in preschool children.展开更多
The shear behavior of fractured rock masses critically infuences engineering stability,particularly in slope engineering.Overcoming limitations of conventional preparation methods,this study utilizes sand-powder 3D pr...The shear behavior of fractured rock masses critically infuences engineering stability,particularly in slope engineering.Overcoming limitations of conventional preparation methods,this study utilizes sand-powder 3D printing to fabricate rocklike specimens with controlled internal fractures.Direct shear tests systematically investigate fracture radius and number efects on strength evolution under constant density,with quantitative analysis revealing their diferential contributions.The results show that:(1)The failure of sand-powder 3D-printed fractured rock-like specimens exhibits brittle characteristics.The shear stress-shear displacement relationship can be divided into fve stages:compaction,elasticity,unstable development,peak,and post-peak.Crack initiation and propagation primarily occur from the late elastic stage to the peak stage.(2)An increase in fracture radius signifcantly reduces pre-peak shear stifness,resulting in a smoother curve progression,while changes in fracture number have minimal impact on the stage-specifc characteristics of the shear curve.(3)Shear strength decreases exponentially with increasing fracture radius,whereas an increase in fracture number leads to a linear reduction in shear strength.Moreover,the weakening efect of fracture number on shear strength becomes more pronounced with larger fracture radius.(4)Quantitative analysis shows that the infuence of fracture radius on shear strength is 2.4 times greater than that of fracture number.This study broadens the understanding of the shear behaviors of fractured rock masses and reveals the key infuence mechanism of fracture density on rock mass deformation and failure,and provides theoretical guidance for slope stability analysis and rock mass engineering design.展开更多
Background:Adverse childhood experiences(ACEs)are a significant issue in adolescent health due to their robust correlation with deficits in executive functions(EF)and health risk behaviors(HRBs).This study aimed to ex...Background:Adverse childhood experiences(ACEs)are a significant issue in adolescent health due to their robust correlation with deficits in executive functions(EF)and health risk behaviors(HRBs).This study aimed to examine the association between ACEs and a range of HRBs,including substance use,sexual risk behavior,suicidal ideation,physical inactivity,and violence.Methods:This cross-sectional study used self-administered questionnaire and cluster sampling in seven junior high schools in Samarinda,Indonesia,with a sample size of 534 students.Data analysis using descriptive statistics,the Chi-square test,the independent t-test,ANOVA,binary logistic regression,and mediation analysis with macro-PROCESS.Results:The most common ACEs were community violence(68.0%),physical neglect(52.8%),psychological/emotional abuse(52.6%),physical abuse(50.4%),and peer bullying(45.9%).Adolescents with more than five ACEs showed significantly higher involvement in smoking/vaping(67.9%),suicidal ideation(75.2%),sexual risk behavior(57.7%),bullying(64.3%),and physical fighting(59.7%)(p<0.001).ACEs were significantly correlated with EF deficits(r=0.471,p<0.01)and HRB(r=0.578,p<0.01).Regression analysis confirmed that ACEs predicted EF deficits(β=0.466,p<0.001)and HRB(β=0.469,p<0.001),with EF deficits partially mediating this relationship(β=0.107,95%CI[0.045,0.094]).In addition,two subdomains of EF deficits,self-motivation(β=0.042)and self-regulation of emotion(β=0.032),significantlymediated the relationship between ACEs and HRBs.Conclusion:These findings suggest an important role for EF deficits in linking childhood adversity to engagement in risky behaviors.Addressing ACEs and EF deficits(self-motivation and self-regulation of emotion)through early intervention may be important in reducing long-term health risks among Indonesian adolescents.展开更多
[Objectives]To observe the effects of Huanglian Jiedu Decoction on pain behaviors in rat models of postherpetic neuralgia(PHN)and analyze potential mechanisms.[Methods]Twenty SD rats with PHN models induced by intrapl...[Objectives]To observe the effects of Huanglian Jiedu Decoction on pain behaviors in rat models of postherpetic neuralgia(PHN)and analyze potential mechanisms.[Methods]Twenty SD rats with PHN models induced by intraplantar injection of 50μL(6×106)varicella-zoster virus(VZV)into the left hind paw were randomly divided into two groups(n=10 each)using a random number table:the model group(PHN group)and the Huanglian Jiedu Decoction group.From day 7 after inoculation,the Huanglian Jiedu Decoction group received oral gavage of Huanglian Jiedu Decoction twice daily for 14 days,while the PHN group received an equal volume of 0.9%saline.Thermal withdrawal latency(TWL)and mechanical withdrawal threshold(MWT)were measured at 1,4,7,14,and 21 d after inoculation.Pain-related behaviors(vocalization,scratching,and licking/biting of the hind paw)were recorded.[Results]Compared with the PHN group,the Huanglian Jiedu Decoction group exhibited significantly prolonged TWL and increased MWT at days 14 and 21(P<0.05).At day 4 post-inoculation,both groups showed marked pain-related behaviors(e.g.,vocalization,scratching,licking/biting).These behaviors persisted until day 21 in the PHN group but significantly decreased in the Huanglian Jiedu Decoction group at days 14 and 21(P<0.05).[Conclusions]Huanglian Jiedu Decoction reduces pain sensitivity and alleviates pain-related behaviors in PHN model rats.The mechanism may involve elevating pain thresholds and decreasing pain conduction velocity.展开更多
The long-term stability of rocks is crucial for ensuring safety in deep engineering,where the prolonged influence of shear loading is a key factor in delayed engineering disasters.Despite its significance,research on ...The long-term stability of rocks is crucial for ensuring safety in deep engineering,where the prolonged influence of shear loading is a key factor in delayed engineering disasters.Despite its significance,research on time-dependent shear failures under true triaxial stress to reflect in situ stress conditions remains limited.This study presents laboratory shear creep measurements on intact sandstone samples under constant normal load(CNL)and constant normal stiffness(CNS)conditions,which are typical of shallow and deep engineering cases,respectively.Our investigation focuses on the effects of various lateral stresses and boundary conditions on the mechanical behaviors and failure modes of the rock samples.Results indicate that lateral stress significantly reduces shear creep deformation and decreases creep rates.Without lateral stress constraints,the samples are prone to lateral tensile fractures leading to macroscopic spalling,likely due to“shear-induced tensile”stress.This failure behavior is mitigated under lateral stress constraints.Additionally,compared to CNL condition,samples under CNS condition demonstrate enhanced long-term shear resistance,reduced shear creep rates,and rougher shear failure surfaces.These findings suggest the need to improve our understanding of rock mass stability and to develop effective disaster prevention and mitigation strategies in engineering applications.展开更多
Biological neurons exhibit a double-membrane structure and perform specialized functions.Replicating the doublemembrane architecture in artificial neurons to mimic biological neuronal functions is a compelling researc...Biological neurons exhibit a double-membrane structure and perform specialized functions.Replicating the doublemembrane architecture in artificial neurons to mimic biological neuronal functions is a compelling research challenge.In this study,we propose a multifunctional neural circuit composed of two capacitors,two linear resistors,a phototube cell,a nonlinear resistor,and a memristor.The phototube and charge-controlled memristor serve as sensors for external light and electric field signals,respectively.By applying Kirchhoff's and Helmholtz's laws,we derive the system's nonlinear dynamical equations and energy function.We further investigate the circuit's dynamics using methods from nonlinear dynamics.Our results show that the circuit can exhibit both periodic and chaotic patterns under stimulation by external light and electric fields.展开更多
Despite the promising prospects of body-centered cubic iron(BCC Fe)in aerospace,energy transportation,and nuclear applications,the effects of extreme environments on its mechanical behaviors and deformation mechanisms...Despite the promising prospects of body-centered cubic iron(BCC Fe)in aerospace,energy transportation,and nuclear applications,the effects of extreme environments on its mechanical behaviors and deformation mechanisms remain elusive to date.In this work,the mechanical responses and deformation behaviors of BCC Fe single crystals under extreme loading conditions are investigated by performing the three-dimensional discrete dislocation dynamics simulations.It turns out that the yield strength(oy)of BCC Fe can be enhanced by increasing the strain rate()and/or decreasing the deformation temperature(T).With the strain rate increasing from=10^(2)s^(-1)to 106 s^(-1),the yield strength at 300 K rises fromσy=51.14 MPa to 1114.57 MPa.When the strain rate exceeds 10^(3)s^(-1),an elastic overshoot phenomenon appears because the applied stress and the low initial dislocation density at the early tensile stage cannot drive the plastic deformation immediately.With the temperature increasing from T=100 K to 800 K,the yield strength atσ_(y)=10^(3)3 s^(-1)decreases fromσε=64.97 MPa to 59.50 MPa.Such temperature and strain rate sensitivity of deformation behaviors are clarified from variations in the configurations of dislocation evolution and dislocation density fluxes.It is demonstrated that at low strain rate(ε≤10^(3)s^(-1))conditions,the deformation behaviors of BCC Fe are dominated by the dislocation multi-slip mechanism.With increasing strain rate to e.g.,>10^(3)s^(-1),the deformation behaviors are governed by the dislocation single-slip.Our investigation on the temperature and strain rate sensitivity of deformation behaviors provides insightful guidance for optimizing the mechanical performances of BCC Fe based ferritic steels.展开更多
Background:Obesity remains a major global health challenge,closely linked to individuals'health beliefs and lifestyle behaviors.Descriptive and relational research methods were used to ascertain the correlation be...Background:Obesity remains a major global health challenge,closely linked to individuals'health beliefs and lifestyle behaviors.Descriptive and relational research methods were used to ascertain the correlation between health beliefs and healthy lifestyle behaviors in obese individuals based on the Health Belief Model.Methods:The population of the research are obese individuals who are treated in the internal medicine clinic in a state hospital in Diyarbakır and applied to a dietitian.Based on power analysis,the study’s sample consisted of 192 obese people.The health belief model scale in obese individuals(HBMSO),the Healthy Lifestyle Behaviors Scale-II(HLBS-II),and the Personal Information Form were used to gather the data.The data was evaluated using the following methods:mean,standard deviation,linear regression analysis,Mann-Whitney U test,Kruskal-Wallis test,Shapiro Wilk and Kolmogorov Smirnov tests,post-hoc Dunn-Benferronni tests,Pearson and Spearman correlation,and others.Results:It was determined that 26.0%of obese individuals were in the 46–55 age range,63.5%were female,64.6%were married,60.4%had a BMI in the range of 30–34.9 kg/m^(2),and 42.7%partially exercised.All sub-dimensions and HBMSO sub-dimensions had statistically significant correlation with the HLBS-II total score.The linear regression analysis results used to identify the predictors of the HLBS-II total score showed that the increase in the level of education and the HBMSO“Importance of Health”sub-dimension score increased the HLBS-II total score,while not exercising and an increase in the HBMSO“Obstacle Perception”sub-dimension score decreased the HLBS-II total score.Conclusion:Individuals’health attitudes have a major impact on leading a healthy lifestyle,which is consistent with the research results.展开更多
This study investigates the prevalence of HIV high-risk behaviors among university students in S City, Sichuan Province. Using a sampling survey method, a total of 3262 valid questionnaires were collected. Data analys...This study investigates the prevalence of HIV high-risk behaviors among university students in S City, Sichuan Province. Using a sampling survey method, a total of 3262 valid questionnaires were collected. Data analysis revealed ten significant issues related to HIV risk behaviors among university students, leading to suggested intervention strategies to address these behaviors.展开更多
文摘Healthy behavior has long been linked to mental health outcomes.However,the role of artificial intelligence(AI)literacy in shaping healthy behaviors and its potential impact on mental health remains underexplored.This paper presents a scoping review offering a novel perspective on the intersection of healthy behaviors,mental health,and AI literacy.By examining how individuals’understanding of AI influences their choices regarding nutrition and their susceptibility to mental health issues,the current study explores emerging trends in health behavior decision-making.This emphasizes the need for integrating AI literacy into mental health and health behaviors education,as well as the development of AI-driven tools to support healthier behavior choices.It highlights that individuals with low AI literacy may misinterpret or overly depend on AI guidance,resulting in maladaptive health choices,while those with high AI literacy may be more likely to engage reflectively and sustain positive behaviors.The paper outlines the importance of inclusive education,user-centered design,and community-based support systems to enhance AI literacy for digitally marginalized groups.AI literacy may be positioned as a key determinant of health equity,better allowing for interdisciplinary strategies that empower individuals to make informed,autonomous decisions that promote both physical and mental health.
基金supported by the National Natural Science Foundation of China(Grant Nos.12473001,11975072,11875102,11835009,and 11965013)the National SKA Program of China(Grant Nos.2022SKA0110200 and 2022SKA0110203)+1 种基金the National 111 Project(Grant No.B16009)supported by Yunnan High-level Talent Training Support Plan Young&Elite Talents Project(Grant No.YNWR-QNBJ-2018-181).
文摘The comprehension of universal thermodynamic behaviors in the supercritical region is crucial for examining the characteristics of black hole systems under high temperature and pressure.This study is devoted to the analysis of characteristic lines and crossover behaviors within the supercritical region.By making use of the free energy,we introduce three key thermodynamic quantities:scaled variance,skewness,and kurtosis.Our results demonstrate that the Widom line,associated with the maximal scaled variance,can effectively differentiate between small and large black hole-like subphases,each displaying distinct thermodynamic behaviors within the supercritical region.Furthermore,by utilizing quasinormal modes,we identify the Frenkel line,offering a dynamic perspective to distinguish between small and large black hole-like subphases.These contribute to a deeper comprehension of black hole subphases in the supercritical region,thus illuminating new facets of black hole thermodynamics.
文摘This study aims to explore the characteristics of novice teachers’inappropriate behaviors in classroom teaching and their intervention strategies.With the continuous improvement of education quality,novice teachers face increasing challenges in teaching practice.Their inappropriate behaviors not only affect the classroom atmosphere but may also negatively impact students’learning outcomes.Therefore,researching the characteristics of novice teachers’inappropriate behaviors and their intervention strategies holds significant scientific and social value.This study employs a combination of quantitative and qualitative methods to analyze the behavioral patterns of novice teachers in classroom teaching and proposes corresponding intervention strategies.The results indicate that novice teachers’inappropriate behaviors mainly manifest as poor classroom management,monotonous teaching methods,and insufficient interaction with students.Based on these findings,the study proposes a series of effective intervention strategies,including enhancing teacher training,optimizing teaching design,and promoting positive interactions between teachers and students.The conclusions of the study not only provide practical guidance for educational practice but also point out directions for future research,emphasizing the crucial role of teacher professional development in improving teaching quality.
基金supports from the National Natural Science Foundation of China (Grant Nos.52004143 and 52374095)the open fund for the Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines (Grant No.SKLMRDPC21KF06).
文摘A series of true triaxial unloading tests are conducted on sandstone specimens with a single structural plane to investigate their mechanical behaviors and failure characteristics under different in situ stress states.The experimental results indicate that the dip angle of structural plane(θ)and the intermediate principal stress(σ2)have an important influence on the peak strength,cracking mode,and rockburst severity.The peak strength exhibits a first increase and then decrease as a function ofσ2 for a constantθ.However,whenσ2 is constant,the maximum peak strength is obtained atθof 90°,and the minimum peak strength is obtained atθof 30°or 45°.For the case of an inclined structural plane,the crack type at the tips of structural plane transforms from a mix of wing and anti-wing cracks to wing cracks with an increase inσ2,while the crack type around the tips of structural plane is always anti-wing cracks for the vertical structural plane,accompanied by a series of tensile cracks besides.The specimens with structural plane do not undergo slabbing failure regardless ofθ,and always exhibit composite tensile-shear failure whatever theσ2 value is.With an increase inσ2 andθ,the intensity of the rockburst is consistent with the tendency of the peak strength.By analyzing the relationship between the cohesion(c),internal friction angle(φ),andθin sandstone specimens,we incorporateθinto the true triaxial unloading strength criterion,and propose a modified linear Mogi-Coulomb criterion.Moreover,the crack propagation mechanism at the tips of structural plane,and closure degree of the structural plane under true triaxial unloading conditions are also discussed and summarized.This study provides theoretical guidance for stability assessment of surrounding rocks containing geological structures in deep complex stress environments.
基金supported by Beijing Natural Science Foundation of China(Grant No.2244099)the China Postdoctoral Science Foundation(Grant No.2023T0025)the National Natural Science Foundation of China(Grant No.52074020).
文摘Layered rock formations are frequently encountered during the excavation of underground structures. The stability of such structures is influenced not only by the stress concentration caused by the cavities in the strata but also by the anisotropy of the layered rock mass. The interaction between them can lead to critical structural failure, such as rupture, collapse, or significant deformation within the adjacent rock mass, thereby jeopardizing operational safety. However, the coupling law and mechanism between the stress concentration resulting from the cavities and the anisotropy of a layered rock mass remain unclear. In this study, a uniaxial compression test was performed on shale specimens containing a circular hole to investigate the effects of layer inclination and circular holes on the mechanical properties, elastic energy storage, and failure behaviors of these specimens. The failure mechanism of the rock surrounding the hole was analyzed on the basis of the single plane of weakness theory and the Kirsch solution. The test results indicated pronounced anisotropy in the compressive strength, elastic modulus, and elastic strain energy of the specimens, with distinct “V”, “M” and “U”-shaped patterns correlated with varying layer inclination angles. In addition, the combined effect of stress concentration and layer inclination resulted in different failure types, which were classified into four groups according to their failure behavior. Theoretical analysis revealed that failure around circular holes in layered rock is affected by a range of variables, such as layer inclination, layer strength, lateral pressure coefficient, azimuth, and loading stress.
基金funded by the National Natural Science Foundation of China(Grant Nos.42207227)the Natural Science Foundation of Hunan Province,China(Grant No.2022JJ40586)The authors also thank the China Postdoctoral Science Foundation(Grant Nos.2022M722428).
文摘In the deep geological disposal repository of high-level radioactive waste,buffer/backfill materials typically consist of compacted bentonite block and granular bentonite.As these materials undergo a long-term hydration,it is anticipated that the two forms of bentonite materials(i.e.compacted bentonite powder(CBP)and granular bentonite(GB))are expected to exhibit differing hydro-mechanical behaviors due to the differences in their structures.This work aims to investigate the differences in swelling pressure and compressibility through a series of swelling pressure tests,compression tests and mercury intrusion porosimetry(MIP)tests.The experimental results demonstrated that swelling pressure curves of the CBP specimens showed higher first peak values and more pronounced collapse than those of the GB specimens at a given dry density,regardless of vapor-water hydration or liquid-water hydration.The final swelling pressures of the two materials were similar at the same dry density,suggesting an independent correlation between swelling pressure and dry density.At the high suction range,the compression curves exhibited an obvious bi-linear pattern for the CBP specimens and a significant nonlinearity for the GB specimens.Meanwhile,the CBP specimens presented higher pre-consolidation pressures and larger compression indices than the GB specimens at a given suction.As suction decreased,the compression curves of the two materials gradually approached each other and their differences were reduced accordingly.After reaching saturation,a good consistency between them was observed whether for final swelling pressure or compressibility.Pore structure analysis revealed that the two materials both presented an initially double structure,and their differences were primarily manifested at the macrostructural level.Eventually,the differences in swelling pressure or compression curves of the two materials were well interpreted by combining microstructural evolutions.
基金financially supported by research grants from Innovative Research Group Project of National Natural Science Foundation of China(No.52021004)National Key Research and Development Program of China(2022YFB3803300)+2 种基金National Natural Science Foundation of China(62474026 and 62074022)Natural Science Foundation of Chongqing(CSTB2024NSCQ-MSX1215,cstc2021jcyj-jqX0015 and CSTB2022NSCQ-MSX1183)the Youth Talent Support Program of Chongqing(CQYC2021059206).
文摘ⅢThe superior adaptability of Prussian blue analogues(PBAs)in interacting with potassium ions has shifted research focus toward their potential application as cathodes of potassium-ion batteries(PIBs).The large interstitial space formed between metal ions and–C≡N–in PBAs can accommodate large-radius K^(+).However,the rapid nucleation in the co-precipitation synthesis process of PBAs induces many lattice defects of[M(CN)_(6)]^(4-)vacancies(V_([M–C≡N])),interstitial and coordinated H_(2)O molecules,which will directly lead to performance degradation.Moreover,originating from various transition metal elements in low/high-spin electron configuration states,PBAs exhibit diverse electrochemical behaviors,such as low reaction kinetics of low-spin iron(Ⅱ),Jahn-Teller distortion and dissolution of manganese(Ⅲ),and electrochemical inertness of nickel(Ⅱ)and copper(Ⅱ).Here,we summarize recently reported structures and properties of PBAs,classifying them based on the types of transition metals(iron,cobalt,manganese,copper,nickel)employed.Advanced synthesis strategies,including control engineering of crystallinity based on H_(2)O molecules and V_([M–C≡N]),were discussed.Also,the approaches for enhancing the electrochemical performance of PBAs were highlighted.Finally,the challenges and prospects towards the future development of PBAs are put forward.The review is expected to provide technical and theoretical support for the design of high-performance PBAs.
基金financially supported by the National Science and Technology Major Project of China(No.2017-Ⅵ-0008-0078)。
文摘Four powder metallurgy(PM)Ni-based superalloys with different Hf and Ta contents were creep-tested at 650℃ and 970 MPa,700℃ and 770 MPa,and 750℃ and 580 MPa,respectively.The effect of Hf and Ta on creep deformation behaviors of the superalloys was studied from multiple scales by SEM,electron backscatter diffraction(EBSD),and aberration-corrected scanning transmission electron microscope(AC-STEM).The results showed that Hf and Ta suppressed the intergranular fracture and initiation of cracks during the acceleration creep stage,which prolonged the creep rupture time.Hf and Ta inhibited the stacking faults extending and the dislocation climbing and promoted the Suzuki segregation of W during the steady-state creep stage,which reduced the minimum creep rate and delayed the start time of the acceleration creep stage.The Suzuki segregation of Co,Cr,Mo,Ti,Nb,W,and Ta along stacking faults was observed after Hf and Ta addition,leading to the localized phase transformation in the γ′phase,and the stacking fault phase was chemically disordered.This study provided ideas for the composition design of novel PM Ni-based superalloys and theoretical foundations for the combined addition of Hf and Ta.
文摘This paper examines the travel behaviors of hand-foot-and-mouth disease(HFMD)patients in Nanchang City in central China.Based on the HFMD patients’hospital visitation data from the Center of Disease Control(CDC)of Nanchang in 2018,a spatial network of patient-to-hospital trip flows is constructed.A Geographic Information Systems(GIS)automated network community detec-tion method,termed‘ScLeiden’,is utilized to delineate the study area into six hospital service areas(HSAs)to represent distinctive health care markets.Patients’travel patterns across these HSAs are compared to highlight the geographic disparity.In two HSAs anchored by major hospitals in the regions,the volume of patients increased up to a travel range and then declined,and thus formed a single peak in the trip volume distribution curve across travel time.Each of the remaining four HSAs exhibited two or more peaks in their trip volume distribution curves.The patterns reflected the split choices of patients for the largest Children Hospital in the region,the second-tier county hospital,or others,which were likely to be stratified by their economic affordability,transportation means,and possible health literacy.The study provides valuable insights into the delineation of HSAs and the unique patients’travel behaviors in China.
基金National Natural Science Foundation of China,Grant/Award Number:52274131General Project of China Postdoctoral Science Foundation,Grant/Award Number:2023M742141Talent Introduction Project of Shandong University of Science and Technology,Grant/Award Number:0104060540171。
文摘This study explored the dynamic behaviors and fracturing mechanisms of flawed granite under split-Hopkinson pressure bar testing,focusing on factors like grain size and flaw dimensions.By means of digital image processing and the discrete element method,Particle Flow Code 2D(PFC2D)models were constructed based on real granite samples,effectively overcoming the limitations of prior studies that mainly relied on randomized parameters.The results illustrate that the crack distribution of granite is significantly influenced by grain size and flaw dimensions.Tension cracks predominate and mineral boundaries,such as between feldspar and quartz,become primary crack sites.Both flaw length and width critically affect the crack density,distribution,and dynamic strength of granite.Specifically,dynamic strength tends to decrease with the enlargement of flaws and increase with an increase in flaw angles up to 90°.
文摘This study tested a multilevel model of the workplace territorial behaviors and employees’knowledge sharing relationship,with team identification serving as a mediator and task interdependence as a moderator.Data were collected from 253 employees(females=128,mean age=28.626,SD=6.470)from 40 work teams from different industries in China.Path analysis results indicated that workplace territorial behaviors were associated with lower employee knowledge sharing.Team identification enhanced employee knowledge sharing and partially mediated the relationship between workplace territorial behaviors and employee knowledge sharing.Task interdependence enhanced knowledge sharing and strengthened the relationship between team identification and knowledge sharing.Thesefindings extend the proposition of social information processing theory by revealing the mediating role of team identification in the relationship between workplace territorial behaviors and knowledge sharing,and clarifying the boundary conditions of team identification.Practical implications of thesefindings include a need for managers to foster collaborative atmospheres,design interdependent tasks,and mitigate territorial behaviors to enhance team identification and knowledge sharing.
文摘With the widespread adoption of smartphones,parental phubbing behaviors have become increasingly prevalent,potentially affecting preschool children’s development.Current research primarily focuses on adolescent populations,while the mechanisms through which parental phubbing and authoritarian parenting style influence preschool children’s behavioral problems within the Chinese cultural context remain to be explored.Our investigation seeks to examine the factors contributing to behavioral difficulties among children of preschool age and provide theoretical guidance for prevention.Methods In our research,we utilized a convenience sampling approach to collect data from parents whose children(n=612)were between 3 and 7 years of age.The questionnaire distribution was facilitated via the Wenjuanxing online survey platform.Research instruments included the Parental Phubbing Scale,Parent-Child Relationship Scale,Authoritarian Parenting Style Scale,and Conners Child Behavior Rating Scale.For analytical procedures,we employed SPSS 24.0 to generate descriptive statistics and correlation analysis.Chain mediation effects were examined via Process macro,while significance assessment of the mediating effects relied on the Bootstrap method for constructing 95%confidence intervals.Results A statistically significant positive association was observed between parental phubbing and behavioral problems exhibited by children(r=0.251,p<0.001).Parental phubbing exhibited a significant direct effect on children’s behavioral problems(β=0.088,p<0.001).Analysis of sequential mediation demonstrated that authoritarian parenting style together with parent-child conflict functioned as significant intermediary variables in the relationship between parental phubbing and children’s problem behaviors(β=0.163,p<0.001),with these indirect pathways constituting 64.94%of the total effect.Conclusion Parental phubbing significantly contributes to behavioral problems in preschool children.Parents should monitor their media use,improve their parenting approach,and enhance parent-child relationships to reduce behavioral problems in preschool children.
基金supported by the National Key Research and Development Program Young Scientist Project(2024YFC2911000)the Natural Science Foundation of Shandong Province(ZR2024ME031)+1 种基金National Natural Science Foundation of China(52474103)Natural Science Foundation of Shandong Province(ZR2024ZD22).
文摘The shear behavior of fractured rock masses critically infuences engineering stability,particularly in slope engineering.Overcoming limitations of conventional preparation methods,this study utilizes sand-powder 3D printing to fabricate rocklike specimens with controlled internal fractures.Direct shear tests systematically investigate fracture radius and number efects on strength evolution under constant density,with quantitative analysis revealing their diferential contributions.The results show that:(1)The failure of sand-powder 3D-printed fractured rock-like specimens exhibits brittle characteristics.The shear stress-shear displacement relationship can be divided into fve stages:compaction,elasticity,unstable development,peak,and post-peak.Crack initiation and propagation primarily occur from the late elastic stage to the peak stage.(2)An increase in fracture radius signifcantly reduces pre-peak shear stifness,resulting in a smoother curve progression,while changes in fracture number have minimal impact on the stage-specifc characteristics of the shear curve.(3)Shear strength decreases exponentially with increasing fracture radius,whereas an increase in fracture number leads to a linear reduction in shear strength.Moreover,the weakening efect of fracture number on shear strength becomes more pronounced with larger fracture radius.(4)Quantitative analysis shows that the infuence of fracture radius on shear strength is 2.4 times greater than that of fracture number.This study broadens the understanding of the shear behaviors of fractured rock masses and reveals the key infuence mechanism of fracture density on rock mass deformation and failure,and provides theoretical guidance for slope stability analysis and rock mass engineering design.
基金supported by the STI 2030-Major Projects(2021ZD0200500).
文摘Background:Adverse childhood experiences(ACEs)are a significant issue in adolescent health due to their robust correlation with deficits in executive functions(EF)and health risk behaviors(HRBs).This study aimed to examine the association between ACEs and a range of HRBs,including substance use,sexual risk behavior,suicidal ideation,physical inactivity,and violence.Methods:This cross-sectional study used self-administered questionnaire and cluster sampling in seven junior high schools in Samarinda,Indonesia,with a sample size of 534 students.Data analysis using descriptive statistics,the Chi-square test,the independent t-test,ANOVA,binary logistic regression,and mediation analysis with macro-PROCESS.Results:The most common ACEs were community violence(68.0%),physical neglect(52.8%),psychological/emotional abuse(52.6%),physical abuse(50.4%),and peer bullying(45.9%).Adolescents with more than five ACEs showed significantly higher involvement in smoking/vaping(67.9%),suicidal ideation(75.2%),sexual risk behavior(57.7%),bullying(64.3%),and physical fighting(59.7%)(p<0.001).ACEs were significantly correlated with EF deficits(r=0.471,p<0.01)and HRB(r=0.578,p<0.01).Regression analysis confirmed that ACEs predicted EF deficits(β=0.466,p<0.001)and HRB(β=0.469,p<0.001),with EF deficits partially mediating this relationship(β=0.107,95%CI[0.045,0.094]).In addition,two subdomains of EF deficits,self-motivation(β=0.042)and self-regulation of emotion(β=0.032),significantlymediated the relationship between ACEs and HRBs.Conclusion:These findings suggest an important role for EF deficits in linking childhood adversity to engagement in risky behaviors.Addressing ACEs and EF deficits(self-motivation and self-regulation of emotion)through early intervention may be important in reducing long-term health risks among Indonesian adolescents.
文摘[Objectives]To observe the effects of Huanglian Jiedu Decoction on pain behaviors in rat models of postherpetic neuralgia(PHN)and analyze potential mechanisms.[Methods]Twenty SD rats with PHN models induced by intraplantar injection of 50μL(6×106)varicella-zoster virus(VZV)into the left hind paw were randomly divided into two groups(n=10 each)using a random number table:the model group(PHN group)and the Huanglian Jiedu Decoction group.From day 7 after inoculation,the Huanglian Jiedu Decoction group received oral gavage of Huanglian Jiedu Decoction twice daily for 14 days,while the PHN group received an equal volume of 0.9%saline.Thermal withdrawal latency(TWL)and mechanical withdrawal threshold(MWT)were measured at 1,4,7,14,and 21 d after inoculation.Pain-related behaviors(vocalization,scratching,and licking/biting of the hind paw)were recorded.[Results]Compared with the PHN group,the Huanglian Jiedu Decoction group exhibited significantly prolonged TWL and increased MWT at days 14 and 21(P<0.05).At day 4 post-inoculation,both groups showed marked pain-related behaviors(e.g.,vocalization,scratching,licking/biting).These behaviors persisted until day 21 in the PHN group but significantly decreased in the Huanglian Jiedu Decoction group at days 14 and 21(P<0.05).[Conclusions]Huanglian Jiedu Decoction reduces pain sensitivity and alleviates pain-related behaviors in PHN model rats.The mechanism may involve elevating pain thresholds and decreasing pain conduction velocity.
基金support from the National Natural Science Foundation of China(Grant No.52209125).
文摘The long-term stability of rocks is crucial for ensuring safety in deep engineering,where the prolonged influence of shear loading is a key factor in delayed engineering disasters.Despite its significance,research on time-dependent shear failures under true triaxial stress to reflect in situ stress conditions remains limited.This study presents laboratory shear creep measurements on intact sandstone samples under constant normal load(CNL)and constant normal stiffness(CNS)conditions,which are typical of shallow and deep engineering cases,respectively.Our investigation focuses on the effects of various lateral stresses and boundary conditions on the mechanical behaviors and failure modes of the rock samples.Results indicate that lateral stress significantly reduces shear creep deformation and decreases creep rates.Without lateral stress constraints,the samples are prone to lateral tensile fractures leading to macroscopic spalling,likely due to“shear-induced tensile”stress.This failure behavior is mitigated under lateral stress constraints.Additionally,compared to CNL condition,samples under CNS condition demonstrate enhanced long-term shear resistance,reduced shear creep rates,and rougher shear failure surfaces.These findings suggest the need to improve our understanding of rock mass stability and to develop effective disaster prevention and mitigation strategies in engineering applications.
基金Project supported by the Gansu Provincial Department of Education University Teacher Innovation Fund Project(Grant No.2024A-168)the Qingyang Science and Technology Plan Project(Grant No.QY-STK-2024B-193)the Horizontal Research Project of Longdong University(Grant No.HXZK2422)。
文摘Biological neurons exhibit a double-membrane structure and perform specialized functions.Replicating the doublemembrane architecture in artificial neurons to mimic biological neuronal functions is a compelling research challenge.In this study,we propose a multifunctional neural circuit composed of two capacitors,two linear resistors,a phototube cell,a nonlinear resistor,and a memristor.The phototube and charge-controlled memristor serve as sensors for external light and electric field signals,respectively.By applying Kirchhoff's and Helmholtz's laws,we derive the system's nonlinear dynamical equations and energy function.We further investigate the circuit's dynamics using methods from nonlinear dynamics.Our results show that the circuit can exhibit both periodic and chaotic patterns under stimulation by external light and electric fields.
基金supported by the National Natural Science Foundation of China(Grant Nos.52171013 and 52130110)the Key Research and Development Program of Shaanxi(Grant No.2025CY-YBXM-127)+1 种基金the Natural Science Foundation of Chongqing(Grant No.CSTB2022NSCQ-MSX0369)the Research Fund of the State Key Laboratory of Solidification Processing(NPU)China(Grant No.2023-QZ-03)。
文摘Despite the promising prospects of body-centered cubic iron(BCC Fe)in aerospace,energy transportation,and nuclear applications,the effects of extreme environments on its mechanical behaviors and deformation mechanisms remain elusive to date.In this work,the mechanical responses and deformation behaviors of BCC Fe single crystals under extreme loading conditions are investigated by performing the three-dimensional discrete dislocation dynamics simulations.It turns out that the yield strength(oy)of BCC Fe can be enhanced by increasing the strain rate()and/or decreasing the deformation temperature(T).With the strain rate increasing from=10^(2)s^(-1)to 106 s^(-1),the yield strength at 300 K rises fromσy=51.14 MPa to 1114.57 MPa.When the strain rate exceeds 10^(3)s^(-1),an elastic overshoot phenomenon appears because the applied stress and the low initial dislocation density at the early tensile stage cannot drive the plastic deformation immediately.With the temperature increasing from T=100 K to 800 K,the yield strength atσ_(y)=10^(3)3 s^(-1)decreases fromσε=64.97 MPa to 59.50 MPa.Such temperature and strain rate sensitivity of deformation behaviors are clarified from variations in the configurations of dislocation evolution and dislocation density fluxes.It is demonstrated that at low strain rate(ε≤10^(3)s^(-1))conditions,the deformation behaviors of BCC Fe are dominated by the dislocation multi-slip mechanism.With increasing strain rate to e.g.,>10^(3)s^(-1),the deformation behaviors are governed by the dislocation single-slip.Our investigation on the temperature and strain rate sensitivity of deformation behaviors provides insightful guidance for optimizing the mechanical performances of BCC Fe based ferritic steels.
文摘Background:Obesity remains a major global health challenge,closely linked to individuals'health beliefs and lifestyle behaviors.Descriptive and relational research methods were used to ascertain the correlation between health beliefs and healthy lifestyle behaviors in obese individuals based on the Health Belief Model.Methods:The population of the research are obese individuals who are treated in the internal medicine clinic in a state hospital in Diyarbakır and applied to a dietitian.Based on power analysis,the study’s sample consisted of 192 obese people.The health belief model scale in obese individuals(HBMSO),the Healthy Lifestyle Behaviors Scale-II(HLBS-II),and the Personal Information Form were used to gather the data.The data was evaluated using the following methods:mean,standard deviation,linear regression analysis,Mann-Whitney U test,Kruskal-Wallis test,Shapiro Wilk and Kolmogorov Smirnov tests,post-hoc Dunn-Benferronni tests,Pearson and Spearman correlation,and others.Results:It was determined that 26.0%of obese individuals were in the 46–55 age range,63.5%were female,64.6%were married,60.4%had a BMI in the range of 30–34.9 kg/m^(2),and 42.7%partially exercised.All sub-dimensions and HBMSO sub-dimensions had statistically significant correlation with the HLBS-II total score.The linear regression analysis results used to identify the predictors of the HLBS-II total score showed that the increase in the level of education and the HBMSO“Importance of Health”sub-dimension score increased the HLBS-II total score,while not exercising and an increase in the HBMSO“Obstacle Perception”sub-dimension score decreased the HLBS-II total score.Conclusion:Individuals’health attitudes have a major impact on leading a healthy lifestyle,which is consistent with the research results.
文摘This study investigates the prevalence of HIV high-risk behaviors among university students in S City, Sichuan Province. Using a sampling survey method, a total of 3262 valid questionnaires were collected. Data analysis revealed ten significant issues related to HIV risk behaviors among university students, leading to suggested intervention strategies to address these behaviors.
