A generalized nonlinear Baker failure criterion is employed with the upper bound limit analysis to study the surrounding rock stability of underground cavities. A three-dimensional(3D) failure mode is established by e...A generalized nonlinear Baker failure criterion is employed with the upper bound limit analysis to study the surrounding rock stability of underground cavities. A three-dimensional(3D) failure mode is established by extending the two-dimensional(2D) failure mode, which offers an upper bound expression of the surrounding rock pressure. This method is validated with a series of examples before the influence of four parameters of scale parameter, curvature parameter, shift parameter and lateral pressure coefficient, on the surrounding rock pressure is analyzed. According to these results, failure ranges of the underground cavities are determined. The following conclusions are reached:(1) the proposed approach is more accurate to predict surrounding rock pressure than the Mohr-Coulomb failure criterion;(2) the surrounding rock with large scale parameter, curvature parameter, shift parameter, and lateral pressure coefficient can lead to a more stable underground cavity;(3) the failure range in 3D mode can be predicted according to the upper bound solutions.展开更多
The application of ductile rock bolts has been a crucial method for solving the problems of large deformations,energy absorption and stability control issues in deep rock masses.To study the anchoring mechanism of the...The application of ductile rock bolts has been a crucial method for solving the problems of large deformations,energy absorption and stability control issues in deep rock masses.To study the anchoring mechanism of the key expansive structure,this paper proposes a novel type of bolt—the Ductile-Expansion bolt,and conducts research on anchoring mechanics,energy absorption characteristics,and failure modes of the bolt.In addition,this paper defines the concept of load-volume ratio of metal rock bolts and proves the Ductile-Expansion bolt is capable of better improving the unit volume bearing capacity of the bolt material.Furthermore,laboratory and field tests verify the Ductile-Expansion bolt had better anchoring effect than the traditional rebar bolt,with the expansion structure favorably enhancing the ductility and energy absorption performance of the bolt.Finally,this paper microscopically analyzes the crack propagation and distribution morphology of the bolts by establishing a 3D coupled numerical model based on FDM-DEM.Numerical results illustrate the interface at the variable diameter of the Ductile-Expansion bolt serves as the transition zone between high and low stress levels.The expansion structure can impose radial compression on the medium around the bolt,which can improve the bolt anchorage performance.展开更多
The strength and failure characteristics of most natural rock mass are influenced by discontinues such as fissures, joints, and weak surfaces. In the present study, the strength and failure behavior of ubiquitous- joi...The strength and failure characteristics of most natural rock mass are influenced by discontinues such as fissures, joints, and weak surfaces. In the present study, the strength and failure behavior of ubiquitous- joint rock-l!ke specimens under uniaxial loading have been investigated by DIC （digital image correlation） and discrete element numerical method （PFC2D）. The results are obtained. Firstly, the UCSJ of spec- imens with γ= 15° or 30° shows similar tendency while α goes from 0° to 75°. With γ= 45° or 60°, the UCSJ of specimens increases when α goes from 0° to 30° and decreases after α goes beyond 30°. With γ=75°, the peak UCSJ value is reached when α=0°. The UCSJ value shows an increasing trend when α goes from 60° to 75°. Secondly, the ubiquitous-joint specimens present different failure modes for various levels of α and γ（β-α）. Based on the experimental results, the failure mode of ubiquitous-joint specimens can be classified into three categories： stepped path failure, failure through parallel plane, and failure through cross plane.展开更多
目的系统评价食管癌术后患者及家属居家支持性照护需求的质性研究,为食管癌术后患者开展优质延续性护理提供依据。方法计算机检索PubMed、Cochrane Library、Web of Science、Embase、CINAHL、Psych-INFO、中国知网、中国生物医学文献...目的系统评价食管癌术后患者及家属居家支持性照护需求的质性研究,为食管癌术后患者开展优质延续性护理提供依据。方法计算机检索PubMed、Cochrane Library、Web of Science、Embase、CINAHL、Psych-INFO、中国知网、中国生物医学文献数据库、万方数据知识服务平台、维普资讯中文期刊服务平台等有关食管癌患者及家属居家支持性照护需求的质性研究,检索时限为建库至2022年3月。使用JBI循证卫生保健中心质性研究质量评价标准进行评价,采用汇集性整合方法进行整合分析。结果共纳入7篇中英文文献,提炼出23个研究结果,归纳出10个新类别,整合成4个整合结果:生理支持需求、信息支持需求、心理支持需求及社会支持需求。结论食管癌术后患者及家属居家支持性照护需求具有特殊性、复杂性及多样性的特点。医护人员应高度重视食管癌术后患者及家属居家支持性照护需求,根据患者及家属具体需求制定支持性护理计划、完善术后随访体系、提供多样化的延续护理模式,提高患者术后生存质量。展开更多
BACKGROUND Gestational anemia is a serious public health problem that affects pregnant women worldwide.Pregnancy conditions and outcomes might be associated with the presence of gestational anemia.This study investiga...BACKGROUND Gestational anemia is a serious public health problem that affects pregnant women worldwide.Pregnancy conditions and outcomes might be associated with the presence of gestational anemia.This study investigated the association of pregnancy characteristics with anemia,exploring the potential etiology of the disease.AIM To assess the association of pregnancy parameters with gestational anemia.METHODS A nested case-control study was conducted based on the Chinese Pregnant Women Cohort Study-Peking Union Medical College Project(CPWCS-PUMC).A total of 3172 women were included.Patient characteristics and gestational anemia occurrence were extracted,and univariable and multivariable logistic regression models were used to analyze the association of pregnancy parameters with gestational anemia.RESULTS Among the 3172 women,14.0% were anemic,46.4% were 25-30 years of age,21.9%resided in eastern,15.7%in middle,12.4%in western 18.0% in southern and 32.0%in northern regions of China.Most women(65.0%)had a normal prepregnancy body mass index.Multivariable analysis found that the occurrence of gestational anemia was lower in the middle and western regions than that in the eastern region[odds ratio(OR)=0.406,95%confidence interval(CI):0.309-0.533,P<0.001],higher in the northern than in the southern region(OR=7.169,95% CI:5.139-10.003,P<0.001),lower in full-term than in premature births(OR=0.491,95% CI:0.316-0.763,P=0.002),and higher in cases with premature membrane rupture(OR=1.404,95% CI:1.051-1.876,P=0.02).CONCLUSION Gestational anemia continues to be a health problem in China,and geographical factors may contribute to the situation.Premature birth and premature membrane rupture may be associated with gestational anemia.Therefore,we should vigorously promote local policy reformation to adapt to the demographic characteristics of at-risk pregnant women,which would potentially reduce the occurrence of gestational anemia.展开更多
In the synovial joint,mechanical force creates an important signal that influences chondrocyte behavior.The conversion of mechanical signals into biochemical cues relies on different elements in mechanotransduction pa...In the synovial joint,mechanical force creates an important signal that influences chondrocyte behavior.The conversion of mechanical signals into biochemical cues relies on different elements in mechanotransduction pathways and culminates in changes in chondrocyte phenotype and extracellular matrix composition/structure.Recently,several mechanosensors,the first responders to mechanical force,have been discovered.However,we still have limited knowledge about the downstream molecules that enact alterations in the gene expression profile during mechanotransduction signaling.Recently,estrogen receptorα(ERα)has been shown to modulate the chondrocyte response to mechanical loading through a ligand-independent mechanism,in line with previous research showing that ERαexerts important mechanotransduction effects on other cell types,such as osteoblasts.In consideration of these recent discoveries,the goal of this review is to position ERαinto the mechanotransduction pathways known to date.Specifically,we first summarize our most recent understanding of the mechanotransduction pathways in chondrocytes on the basis of three categories of actors,namely mechanosensors,mechanotransducers,and mechanoimpactors.Then,the specific roles played by ERαin mediating the chondrocyte response to mechanical loading are discussed,and the potential interactions of ERαwith other molecules in mechanotransduction pathways are explored.Finally,we propose several future research directions that may advance our understanding of the roles played by ERαin mediating biomechanical cues under physiological and pathological conditions.展开更多
A large number of research results show that the synchronizability of complex networks is closely related to the topological structure. Some typical complex network models, such as random networks, small-world network...A large number of research results show that the synchronizability of complex networks is closely related to the topological structure. Some typical complex network models, such as random networks, small-world networks, BA scale-free network, etc, have totally different synchronizability. In this paper, a kind of hierarchical network synchronizability of self-similar module structures was studied, with more focus on the effect of the initial size of the module and network layer to the synchronizability and further research on the problem of network synchronous optimization. The Law of Segmentation Method was employed to reduce the maximum node betweenness and the Law of Parallel Reconnection employed to improve the ability of synchronizability of complex network by reducing the average path length of networks. Meanwhile, the effectiveness of proposed methods was verified through a lot of numerically simulative experiments.展开更多
The pursuit of high-brightness solid-state lighting(SSL)stimulates the development of all-inorganic color converters with high robustness.It is required that the fluorescent material is able to cope with the extreme c...The pursuit of high-brightness solid-state lighting(SSL)stimulates the development of all-inorganic color converters with high robustness.It is required that the fluorescent material is able to cope with the extreme condition generated from the irradiation of high-power-density excitation light.As such,in this work,we developed a new composite color converter,i,e.,Y_(3)Al_(5)O_(12):Ce^(3+)phosphor-in-silica glass ceramic(YAG:Ce^(3+)PiSGC).Remarkably,the amorphous SiO_(2)matrix spontaneously transforms into tetragonal SiO_(2)crystallites during co-sintering with crystallization fraction reaching up to>90%(almost full ceramization).The activation energy for crystallization E_(c)and Avrami index n of amorphous silica oxide are 298.5 kJ/mol and 1.71,indicating the diffusion-controlled glass crystallization mechanism.The fabricated prototype high-power phosphor-converted white light-emitting diode(pc-wLED)and phosphor-converted white laser diode(pc-wLD)based on YAG:Ce^(3+)PiSGC show satisfactory photometric/colorimetric parameters.The developed color co nverters have combined merits of environmental protection property,cost-effective manufacturing,good luminescent performance,and easy scalability.This study highlights a new kind of opto-functional composite material and its application as an efficient color converter in high-power solid-state lightings.展开更多
Purposes:This study uses the method of qualitative research to conduct in-depth interviews with pregnant women,explore the experiences of pregnant women undertake mindfulness training.Methods:The study adopts a qualit...Purposes:This study uses the method of qualitative research to conduct in-depth interviews with pregnant women,explore the experiences of pregnant women undertake mindfulness training.Methods:The study adopts a qualitative,in-depth interview method.Semi-structured interviews were conducted with 10 pregnant women.Data from semi-structured interviews were analysed by qualitative content analysis using QSR NVivo 12 software.Results:Four themes were generated to show how pregnant women experiences of the mindfulness training.They are Emotion management,Benefits of mindfulness training for childbirth,Challenges and influencing factors of mindfulness training and Different attitudes toward mindfulness training.Conclusions:Pregnant women undertaking mindfulness training can effectively reduce stress and has positive effects on work and life.Mindfulness training can be used as a way to improve the mental health of pregnant women.展开更多
Spinal cord injury (SCI), often resulting from car accidents,falls and violence, represents a complicated trauma affecting multiple tissues, such as the vertebrate, disks of the spinal column, or the spinal cord itsel...Spinal cord injury (SCI), often resulting from car accidents,falls and violence, represents a complicated trauma affecting multiple tissues, such as the vertebrate, disks of the spinal column, or the spinal cord itself. Direct injury to the spinal cord, which is the focus of this insight, may disrupt the neuronal connections between the brain and the periphery,leading to the loss of motor function and paralysis. Consequently, SCI patients suffer neurologic deficits and disability,and are subjected to high healthcare costs for a lifetime.展开更多
While the“amorphous to crystalline”transformation process,which has significant potential for application,has been widely studied,the microscopic mechanism on the nanometer scale is not fully understood.In contrast ...While the“amorphous to crystalline”transformation process,which has significant potential for application,has been widely studied,the microscopic mechanism on the nanometer scale is not fully understood.In contrast to common heat-driven phase transformations,the present study demonstrated the force-driven moisture-mediated nanocrystallization of perovskite CsPbBr_(3)precipitated from a glass matrix.In the present case,the breakage of the glass network under shearing force produces high-energy sites to absorb H2O molecules/clusters from ambient moisture,and the hydration process promotes the crystallization process.Microscratch analysis combined with confocal laser scanning microscopy revealed that the distribution of CsPbBr_(3)nanocrystals almost reproduced that of the localized stress field and clearly reflected the crack propagation pathways.The potential applications of perovskite glass in the optical sensing of force and moisture are also explored.Our findings provide insight into crystal nucleation/growth in glass,as well as understanding the dynamics of crack propagation during the brittle fracture process.展开更多
Joints shear strength is a critical parameter during the design and construction of geotechnical engineering structures.The prevailing models mostly adopt the form of empirical functions,employing mathematical regress...Joints shear strength is a critical parameter during the design and construction of geotechnical engineering structures.The prevailing models mostly adopt the form of empirical functions,employing mathematical regression techniques to represent experimental data.As an alternative approach,this paper proposes a new integrated intelligent computing paradigm that aims to predict joints shear strength.Five metaheuristic optimization algorithms,including the chameleon swarm algorithm(CSA),slime mold algorithm,transient search optimization algorithm,equilibrium optimizer and social network search algorithm,were employed to enhance the performance of the multilayered perception(MLP)model.Efficiency comparisons were conducted between the proposed CSA-MLP model and twelve classical models,employing statistical indicators such as root mean square error(RMSE),correlation coefficient(R2),mean absolute error(MAE),and variance accounted for(VAF)to evaluate the performance of each model.The sensitivity analysis of parameters that impact joints shear strength was conducted.Finally,the feasibility and limitations of this study were discussed.The results revealed that,in comparison to other models,the CSA-MLP model exhibited the most appropriate performance in terms of R2(0.88),RMSE(0.19),MAE(0.15),and VAF(90.32%)values.The result of sensitivity analysis showed that the normal stress and the joint roughness coefficient were the most critical factors influencing joints shear strength.This paper presented an efficacious attempt toward swift prediction of joints shear strength,thus avoiding the need for costly in-site and laboratory tests.展开更多
BACKGROUND Major depressive disorder(MDD)with comorbid anxiety is an intricate psychiatric condition,but limited research is available on the degree centrality(DC)between anxious MDD and nonanxious MDD patients.AIM To...BACKGROUND Major depressive disorder(MDD)with comorbid anxiety is an intricate psychiatric condition,but limited research is available on the degree centrality(DC)between anxious MDD and nonanxious MDD patients.AIM To examine changes in DC values and their use as neuroimaging biomarkers in anxious and non-anxious MDD patients.METHODS We examined 23 anxious MDD patients,30 nonanxious MDD patients,and 28 healthy controls(HCs)using the DC for data analysis.RESULTS Compared with HCs,the anxious MDD group reported markedly reduced DC values in the right fusiform gyrus(FFG)and inferior occipital gyrus,whereas elevated DC values in the left middle frontal gyrus and left inferior parietal angular gyrus.The nonanxious MDD group exhibited surged DC values in the bilateral cerebellum IX,right precuneus,and opercular part of the inferior frontal gyrus.Unlike the nonanxious MDD group,the anxious MDD group exhibited declined DC values in the right FFG and bilateral calcarine(CAL).Besides,declined DC values in the right FFG and bilateral CAL negatively correlated with anxiety scores in the MDD group.CONCLUSION This study shows that abnormal DC patterns in MDD,especially in the left CAL,can distinguish MDD from its anxiety subtype,indicating a potential neuroimaging biomarker.展开更多
In this work,we discovered an unexpected mechanoluminescence (ML) phenomena occurring when transforming amorphous into crystalline,due to the stress-induced precipitation of CsPbBr3 perovskite nanocrystals on glass su...In this work,we discovered an unexpected mechanoluminescence (ML) phenomena occurring when transforming amorphous into crystalline,due to the stress-induced precipitation of CsPbBr3 perovskite nanocrystals on glass surface.It is revealed that,unlike the conventional thermal-induced phase transformation mechanism,the breakage of bonding of glass network provides the energy for nucleation and growth,and the shear stress avoids the long-range migration of structural units for crystallization.Such unique ML phenomenon enables the visualization of dynamical force that is inaccessible by common strategy,and so,opens up some novel applications,such as the pressure-sensitive "glassy pencil" to learn people's writing habits,and the pb^2+-detection with good sensitivity and selectivity.These findings not only demonstrate an effective route for the preparation of perovskite materials in a green,time-saving,low cost,and scalable way,enrich the knowledge of glass crystallization mechanism,but also exploit a useful avenue to quantitatively visualize the dynamical force.展开更多
基金Projects(51679117,11772358,51774322,51474249,51404179,51274249)supported by the National Natural Science Foundation of China。
文摘A generalized nonlinear Baker failure criterion is employed with the upper bound limit analysis to study the surrounding rock stability of underground cavities. A three-dimensional(3D) failure mode is established by extending the two-dimensional(2D) failure mode, which offers an upper bound expression of the surrounding rock pressure. This method is validated with a series of examples before the influence of four parameters of scale parameter, curvature parameter, shift parameter and lateral pressure coefficient, on the surrounding rock pressure is analyzed. According to these results, failure ranges of the underground cavities are determined. The following conclusions are reached:(1) the proposed approach is more accurate to predict surrounding rock pressure than the Mohr-Coulomb failure criterion;(2) the surrounding rock with large scale parameter, curvature parameter, shift parameter, and lateral pressure coefficient can lead to a more stable underground cavity;(3) the failure range in 3D mode can be predicted according to the upper bound solutions.
基金supported by the National Natural Science Foundation of China(Nos.52174101,52474169,and 42477202)Guangdong Basic and Applied Basic Research Foundation(Nos.2023A1515011634 and 2023A1515030243)the Department of Science and Technology of Guangdong Province,China(No.2021ZT09G087).
文摘The application of ductile rock bolts has been a crucial method for solving the problems of large deformations,energy absorption and stability control issues in deep rock masses.To study the anchoring mechanism of the key expansive structure,this paper proposes a novel type of bolt—the Ductile-Expansion bolt,and conducts research on anchoring mechanics,energy absorption characteristics,and failure modes of the bolt.In addition,this paper defines the concept of load-volume ratio of metal rock bolts and proves the Ductile-Expansion bolt is capable of better improving the unit volume bearing capacity of the bolt material.Furthermore,laboratory and field tests verify the Ductile-Expansion bolt had better anchoring effect than the traditional rebar bolt,with the expansion structure favorably enhancing the ductility and energy absorption performance of the bolt.Finally,this paper microscopically analyzes the crack propagation and distribution morphology of the bolts by establishing a 3D coupled numerical model based on FDM-DEM.Numerical results illustrate the interface at the variable diameter of the Ductile-Expansion bolt serves as the transition zone between high and low stress levels.The expansion structure can impose radial compression on the medium around the bolt,which can improve the bolt anchorage performance.
基金funding from Project (Nos.51474249 and 51404179) supported by National Natural Science Foundation of ChinaProject Supported by Innovation Driven Plan of Central South University of China (No.2016CX019)Project (No. SKLGDUEK1405) funded by the Open Projects of State Key Laboratory for Geo-mechanics and Deep Underground Engineering of China University of Mining and Technology,in China
文摘The strength and failure characteristics of most natural rock mass are influenced by discontinues such as fissures, joints, and weak surfaces. In the present study, the strength and failure behavior of ubiquitous- joint rock-l!ke specimens under uniaxial loading have been investigated by DIC （digital image correlation） and discrete element numerical method （PFC2D）. The results are obtained. Firstly, the UCSJ of spec- imens with γ= 15° or 30° shows similar tendency while α goes from 0° to 75°. With γ= 45° or 60°, the UCSJ of specimens increases when α goes from 0° to 30° and decreases after α goes beyond 30°. With γ=75°, the peak UCSJ value is reached when α=0°. The UCSJ value shows an increasing trend when α goes from 60° to 75°. Secondly, the ubiquitous-joint specimens present different failure modes for various levels of α and γ（β-α）. Based on the experimental results, the failure mode of ubiquitous-joint specimens can be classified into three categories： stepped path failure, failure through parallel plane, and failure through cross plane.
文摘目的系统评价食管癌术后患者及家属居家支持性照护需求的质性研究,为食管癌术后患者开展优质延续性护理提供依据。方法计算机检索PubMed、Cochrane Library、Web of Science、Embase、CINAHL、Psych-INFO、中国知网、中国生物医学文献数据库、万方数据知识服务平台、维普资讯中文期刊服务平台等有关食管癌患者及家属居家支持性照护需求的质性研究,检索时限为建库至2022年3月。使用JBI循证卫生保健中心质性研究质量评价标准进行评价,采用汇集性整合方法进行整合分析。结果共纳入7篇中英文文献,提炼出23个研究结果,归纳出10个新类别,整合成4个整合结果:生理支持需求、信息支持需求、心理支持需求及社会支持需求。结论食管癌术后患者及家属居家支持性照护需求具有特殊性、复杂性及多样性的特点。医护人员应高度重视食管癌术后患者及家属居家支持性照护需求,根据患者及家属具体需求制定支持性护理计划、完善术后随访体系、提供多样化的延续护理模式,提高患者术后生存质量。
基金This work is supported by the National Natural Science Foundation of China(No.51774322)Hunan Provincial Key Research and Development Program,China(No.2022SK2082)+3 种基金Hunan Provincial Natural Science Foundation of China(No.2018JJ2500)Fundamental Research Funds for the Central Universities of Central South University,China(No.2021zzts0275)Western Transportation Construction Technology Project,China(No.200631879846)Science and Technology Progress and Innovation Plan of Hunan Provincial Department of Transportation,China(No.2010003).
文摘BACKGROUND Gestational anemia is a serious public health problem that affects pregnant women worldwide.Pregnancy conditions and outcomes might be associated with the presence of gestational anemia.This study investigated the association of pregnancy characteristics with anemia,exploring the potential etiology of the disease.AIM To assess the association of pregnancy parameters with gestational anemia.METHODS A nested case-control study was conducted based on the Chinese Pregnant Women Cohort Study-Peking Union Medical College Project(CPWCS-PUMC).A total of 3172 women were included.Patient characteristics and gestational anemia occurrence were extracted,and univariable and multivariable logistic regression models were used to analyze the association of pregnancy parameters with gestational anemia.RESULTS Among the 3172 women,14.0% were anemic,46.4% were 25-30 years of age,21.9%resided in eastern,15.7%in middle,12.4%in western 18.0% in southern and 32.0%in northern regions of China.Most women(65.0%)had a normal prepregnancy body mass index.Multivariable analysis found that the occurrence of gestational anemia was lower in the middle and western regions than that in the eastern region[odds ratio(OR)=0.406,95%confidence interval(CI):0.309-0.533,P<0.001],higher in the northern than in the southern region(OR=7.169,95% CI:5.139-10.003,P<0.001),lower in full-term than in premature births(OR=0.491,95% CI:0.316-0.763,P=0.002),and higher in cases with premature membrane rupture(OR=1.404,95% CI:1.051-1.876,P=0.02).CONCLUSION Gestational anemia continues to be a health problem in China,and geographical factors may contribute to the situation.Premature birth and premature membrane rupture may be associated with gestational anemia.Therefore,we should vigorously promote local policy reformation to adapt to the demographic characteristics of at-risk pregnant women,which would potentially reduce the occurrence of gestational anemia.
基金supported by the Department of Orthopaedic Surgery at the University of Pittsburghthe Department of Orthopaedic Surgery at Xiangya Hospital,Central South Universitypartially supported by the Pennsylvania Department of Health。
文摘In the synovial joint,mechanical force creates an important signal that influences chondrocyte behavior.The conversion of mechanical signals into biochemical cues relies on different elements in mechanotransduction pathways and culminates in changes in chondrocyte phenotype and extracellular matrix composition/structure.Recently,several mechanosensors,the first responders to mechanical force,have been discovered.However,we still have limited knowledge about the downstream molecules that enact alterations in the gene expression profile during mechanotransduction signaling.Recently,estrogen receptorα(ERα)has been shown to modulate the chondrocyte response to mechanical loading through a ligand-independent mechanism,in line with previous research showing that ERαexerts important mechanotransduction effects on other cell types,such as osteoblasts.In consideration of these recent discoveries,the goal of this review is to position ERαinto the mechanotransduction pathways known to date.Specifically,we first summarize our most recent understanding of the mechanotransduction pathways in chondrocytes on the basis of three categories of actors,namely mechanosensors,mechanotransducers,and mechanoimpactors.Then,the specific roles played by ERαin mediating the chondrocyte response to mechanical loading are discussed,and the potential interactions of ERαwith other molecules in mechanotransduction pathways are explored.Finally,we propose several future research directions that may advance our understanding of the roles played by ERαin mediating biomechanical cues under physiological and pathological conditions.
文摘A large number of research results show that the synchronizability of complex networks is closely related to the topological structure. Some typical complex network models, such as random networks, small-world networks, BA scale-free network, etc, have totally different synchronizability. In this paper, a kind of hierarchical network synchronizability of self-similar module structures was studied, with more focus on the effect of the initial size of the module and network layer to the synchronizability and further research on the problem of network synchronous optimization. The Law of Segmentation Method was employed to reduce the maximum node betweenness and the Law of Parallel Reconnection employed to improve the ability of synchronizability of complex network by reducing the average path length of networks. Meanwhile, the effectiveness of proposed methods was verified through a lot of numerically simulative experiments.
基金Project supported by the National Natural Science Foundation of China(U2005213,51972303,11974350)Science Fund for Distinguished Young Scholars of Fujian Province(2022J06030)+2 种基金Science Fund of Fujian Province(2022J05091)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR134)the STS Project of Fujian-CAS(2022T3069)。
文摘The pursuit of high-brightness solid-state lighting(SSL)stimulates the development of all-inorganic color converters with high robustness.It is required that the fluorescent material is able to cope with the extreme condition generated from the irradiation of high-power-density excitation light.As such,in this work,we developed a new composite color converter,i,e.,Y_(3)Al_(5)O_(12):Ce^(3+)phosphor-in-silica glass ceramic(YAG:Ce^(3+)PiSGC).Remarkably,the amorphous SiO_(2)matrix spontaneously transforms into tetragonal SiO_(2)crystallites during co-sintering with crystallization fraction reaching up to>90%(almost full ceramization).The activation energy for crystallization E_(c)and Avrami index n of amorphous silica oxide are 298.5 kJ/mol and 1.71,indicating the diffusion-controlled glass crystallization mechanism.The fabricated prototype high-power phosphor-converted white light-emitting diode(pc-wLED)and phosphor-converted white laser diode(pc-wLD)based on YAG:Ce^(3+)PiSGC show satisfactory photometric/colorimetric parameters.The developed color co nverters have combined merits of environmental protection property,cost-effective manufacturing,good luminescent performance,and easy scalability.This study highlights a new kind of opto-functional composite material and its application as an efficient color converter in high-power solid-state lightings.
基金This work is supported by CAMS Innovation Fund for Medical Sciences(CIFMS)(2021-I2M-1-023).
文摘Purposes:This study uses the method of qualitative research to conduct in-depth interviews with pregnant women,explore the experiences of pregnant women undertake mindfulness training.Methods:The study adopts a qualitative,in-depth interview method.Semi-structured interviews were conducted with 10 pregnant women.Data from semi-structured interviews were analysed by qualitative content analysis using QSR NVivo 12 software.Results:Four themes were generated to show how pregnant women experiences of the mindfulness training.They are Emotion management,Benefits of mindfulness training for childbirth,Challenges and influencing factors of mindfulness training and Different attitudes toward mindfulness training.Conclusions:Pregnant women undertaking mindfulness training can effectively reduce stress and has positive effects on work and life.Mindfulness training can be used as a way to improve the mental health of pregnant women.
文摘Spinal cord injury (SCI), often resulting from car accidents,falls and violence, represents a complicated trauma affecting multiple tissues, such as the vertebrate, disks of the spinal column, or the spinal cord itself. Direct injury to the spinal cord, which is the focus of this insight, may disrupt the neuronal connections between the brain and the periphery,leading to the loss of motor function and paralysis. Consequently, SCI patients suffer neurologic deficits and disability,and are subjected to high healthcare costs for a lifetime.
基金supported by the National Natural Science Foundation of China(52372161,51972303,U2005213,and 11974350)the Science Fund for Distinguished Young Scholars of Fujian Province(2022J06030)+1 种基金the STS Project of Fujian-CAS(2022T3069)the 14th Five Year Scientific and Technological Innovation Planning Project of FJIRSM(CXZX-2022-GH11)。
文摘While the“amorphous to crystalline”transformation process,which has significant potential for application,has been widely studied,the microscopic mechanism on the nanometer scale is not fully understood.In contrast to common heat-driven phase transformations,the present study demonstrated the force-driven moisture-mediated nanocrystallization of perovskite CsPbBr_(3)precipitated from a glass matrix.In the present case,the breakage of the glass network under shearing force produces high-energy sites to absorb H2O molecules/clusters from ambient moisture,and the hydration process promotes the crystallization process.Microscratch analysis combined with confocal laser scanning microscopy revealed that the distribution of CsPbBr_(3)nanocrystals almost reproduced that of the localized stress field and clearly reflected the crack propagation pathways.The potential applications of perovskite glass in the optical sensing of force and moisture are also explored.Our findings provide insight into crystal nucleation/growth in glass,as well as understanding the dynamics of crack propagation during the brittle fracture process.
基金This paper gets its funding from Projects(42277175)supported by National Natural Science Foundation of China,Project(2023JJ30657)+2 种基金supported by Hunan Provincial Natural Science Foundation of China and the National Key Research,Hunan Provincial Department of natural resources geological exploration project(BSDZSB43202403)The First National Natural Disaster Comprehensive Risk Survey in Hunan Province(2022-70the National Key Research and Development Program of China-2023 Key Special Project(No.2023YFC2907400).
文摘Joints shear strength is a critical parameter during the design and construction of geotechnical engineering structures.The prevailing models mostly adopt the form of empirical functions,employing mathematical regression techniques to represent experimental data.As an alternative approach,this paper proposes a new integrated intelligent computing paradigm that aims to predict joints shear strength.Five metaheuristic optimization algorithms,including the chameleon swarm algorithm(CSA),slime mold algorithm,transient search optimization algorithm,equilibrium optimizer and social network search algorithm,were employed to enhance the performance of the multilayered perception(MLP)model.Efficiency comparisons were conducted between the proposed CSA-MLP model and twelve classical models,employing statistical indicators such as root mean square error(RMSE),correlation coefficient(R2),mean absolute error(MAE),and variance accounted for(VAF)to evaluate the performance of each model.The sensitivity analysis of parameters that impact joints shear strength was conducted.Finally,the feasibility and limitations of this study were discussed.The results revealed that,in comparison to other models,the CSA-MLP model exhibited the most appropriate performance in terms of R2(0.88),RMSE(0.19),MAE(0.15),and VAF(90.32%)values.The result of sensitivity analysis showed that the normal stress and the joint roughness coefficient were the most critical factors influencing joints shear strength.This paper presented an efficacious attempt toward swift prediction of joints shear strength,thus avoiding the need for costly in-site and laboratory tests.
基金Supported by Hubei Provincial Department of Science and Technology Natural Fund,No.2024AFC056the Open Fund of the Mental Health Research Institute at Three Gorges University,No.YCXL-23-11.
文摘BACKGROUND Major depressive disorder(MDD)with comorbid anxiety is an intricate psychiatric condition,but limited research is available on the degree centrality(DC)between anxious MDD and nonanxious MDD patients.AIM To examine changes in DC values and their use as neuroimaging biomarkers in anxious and non-anxious MDD patients.METHODS We examined 23 anxious MDD patients,30 nonanxious MDD patients,and 28 healthy controls(HCs)using the DC for data analysis.RESULTS Compared with HCs,the anxious MDD group reported markedly reduced DC values in the right fusiform gyrus(FFG)and inferior occipital gyrus,whereas elevated DC values in the left middle frontal gyrus and left inferior parietal angular gyrus.The nonanxious MDD group exhibited surged DC values in the bilateral cerebellum IX,right precuneus,and opercular part of the inferior frontal gyrus.Unlike the nonanxious MDD group,the anxious MDD group exhibited declined DC values in the right FFG and bilateral calcarine(CAL).Besides,declined DC values in the right FFG and bilateral CAL negatively correlated with anxiety scores in the MDD group.CONCLUSION This study shows that abnormal DC patterns in MDD,especially in the left CAL,can distinguish MDD from its anxiety subtype,indicating a potential neuroimaging biomarker.
基金the National Natural Science Foundation of China (Nos.11674318, 11774346, 5187228& and 51472242)the National Key R&D Program of China (No. 2016YFB0701003)the Chunmiao Project of the Haixi Institute of the Chinese Academy of Sciences (No.CMZX-2017-002).
文摘In this work,we discovered an unexpected mechanoluminescence (ML) phenomena occurring when transforming amorphous into crystalline,due to the stress-induced precipitation of CsPbBr3 perovskite nanocrystals on glass surface.It is revealed that,unlike the conventional thermal-induced phase transformation mechanism,the breakage of bonding of glass network provides the energy for nucleation and growth,and the shear stress avoids the long-range migration of structural units for crystallization.Such unique ML phenomenon enables the visualization of dynamical force that is inaccessible by common strategy,and so,opens up some novel applications,such as the pressure-sensitive "glassy pencil" to learn people's writing habits,and the pb^2+-detection with good sensitivity and selectivity.These findings not only demonstrate an effective route for the preparation of perovskite materials in a green,time-saving,low cost,and scalable way,enrich the knowledge of glass crystallization mechanism,but also exploit a useful avenue to quantitatively visualize the dynamical force.
