In sheet metal forming, drawbeads are often used to control uneven material flow which may cause defects such as wrinkles, fracture, surface distortion and springback. Appropriate setting and adjusting the drawbead ...In sheet metal forming, drawbeads are often used to control uneven material flow which may cause defects such as wrinkles, fracture, surface distortion and springback. Appropriate setting and adjusting the drawbead force is one of the most important pa- rameters in sheet metal forming process control. This paper derives the model of loop drawbead restraining force (DBRF) using plastic forming theory, and gives the min imum blankholding force. Experiments are carried out to verify the proposed DBRF model. The good agreement between the calculated values and experiments data justi- fies the proposed loop drawbead restraining force model.展开更多
Due to complexities of draw-bead restraining force calculated according to theory and depending on sheet metal forming properties experiment testing system, a simplified method to calculate draw-bead restraining force...Due to complexities of draw-bead restraining force calculated according to theory and depending on sheet metal forming properties experiment testing system, a simplified method to calculate draw-bead restraining force is put forward by experimental method in cup-shaped drawing process. The experimental results were compared with numerical results and proved agreement. It shows the method is effective.展开更多
The extracts from leaves of Manglietia insignis （Wall） Blume, Manglietia chingii Dandy and Manglietia yuyuanensis Law were prepared by organic solvent extraction and their components were analyzed by GC/MS and quant...The extracts from leaves of Manglietia insignis （Wall） Blume, Manglietia chingii Dandy and Manglietia yuyuanensis Law were prepared by organic solvent extraction and their components were analyzed by GC/MS and quantified. Meanwhile, the free radicals restraining activities were detected. The 21 compounds in M. insignis, 36 compounds in M. chigii and 20 compounds in M. yuyuanensis were identified. There were 11 common components in the extracts from three Manglietia species, and 12 components in two Manglietia species. The results of relative contents of every component in three extracts showed that the main constituents of M. insignis were terpenoids and alkene, amounting to 38.93%, followed by alkane （28.18%）, the nitrogen containing compounds （15.73%） and aromatic compounds （7.23 %）. The main constituents of leaf extract from M. chingii were the terpenoids and alkene, carboxylic acid, alkane and aromatic compounds, amounting to 30.22%, 14.17%, 13.87% and 13.29%, respectively, The main constituents of M. yuyuanensis were alcohol compounds, the terpenoids and alkene, and aromatic compounds, amounting to 28.00%, 25.38% and 18.00% respectively. The results showed that the three extracts had strong function of restraining oxygen free radicals. The ultra oxygen anions activity was restrained at the highest level, when the three extracts were diluted by hundred-fold, whereas the restraining capacity of hydroxyl free radicals reached maximum, when the three extracts were diluted by twenty-fold. The above results provide scientific evidences for further approaching the ecological healthy function of three MangUetia species展开更多
The method of planning acceleration is discussed to restrain the residual vibration of flexible arm. Based on the built mathematical model of the flexible arm, the equations of vibration with acceleration,vibration f...The method of planning acceleration is discussed to restrain the residual vibration of flexible arm. Based on the built mathematical model of the flexible arm, the equations of vibration with acceleration,vibration frequency,damping and time are obtained theoretically.According to the vibration frequency and damping, the suitable acceleration is executed experimentally to the flexible arm at the corresponding time. The result shows that this way can give rise to good effect to restrain the residual vibration.展开更多
The effects of various combustion conditions (i. e. particle size of coals, oxygen concentration in combustion gas and coal content in the fuel bed, etc.), on reducing conversion of NO_x during coal combustion were st...The effects of various combustion conditions (i. e. particle size of coals, oxygen concentration in combustion gas and coal content in the fuel bed, etc.), on reducing conversion of NO_x during coal combustion were studied. Under the present combustion conditions, coals with smaller particle size gave the lower conversion of NO_x, and as expected that an decrease in overall stoichiometric ratio, whether by an decrease in O_2 content in combustion gas or by an increase in coal content in fuel bed would lead to a lower conversion of NO_x. In order to investigate the effect of metallic oxide layers on restraining NO_x formation, the combustion experiments for coal granules with adhering layer of various metallic oxides including Fe_2O_3, Ni_2O_3 and mixed oxides Fe-Ni-O_x were conducted in a packed bed combustor. The combustion experiments have shown that most of adhering materials gave considerable effect on reduction of NO_x emission during coal combustion.展开更多
The expansive behaviors of the expensive concrete under different restraining conditions were systemically studied. The experimental results indicate that expansive deformation obviously increases before 10 days and t...The expansive behaviors of the expensive concrete under different restraining conditions were systemically studied. The experimental results indicate that expansive deformation obviously increases before 10 days and tends to be constant after 25 days regardless of the restraining conditions. The mixture ratio of expansive cement and restraining conditions are the main factors affecting expansive deformation. Self-stress can be obtained when the expansive deformation is restrained. The higher self-stress could be obtained when the expensive concrete is restrained by steel tube. For specimens under steel tube restraining, the wall thickness and the length of the steel tube have important influence on self-stress. Both the radial self-stress and axial self-stress in concrete core increase when wall thickness or length of the steel tube increases.展开更多
The new rural cooperative medical system has achieved periodical achievements since its establishment.Nevertheless,there are many factors hampering the development of the new system,such as the high cost,the difficult...The new rural cooperative medical system has achieved periodical achievements since its establishment.Nevertheless,there are many factors hampering the development of the new system,such as the high cost,the difficulties in fund procurement,the lack of management,the narrow coverage of benefit,the ineffective constraint to the designated medical institutions,the high fund balance rate,and the poor medical facilities and services in rural areas.Countermeasures are put forward to solve these problems,including improving the system design,expanding the coverage of the system,expanding the fund sources,reducing the financing costs,strengthening the fund supervision,enhancing the supervision of designated medical institutions,and improving the capacity of health services in rural areas.展开更多
Battery energy storage stations(BESSs)pose sever-al challenges for both phasor-based differential protection and the newly-proposed time-domain differential protection.These challenges include low sensitivity and even...Battery energy storage stations(BESSs)pose sever-al challenges for both phasor-based differential protection and the newly-proposed time-domain differential protection.These challenges include low sensitivity and even rejection.Besides,the negative impact of various nonideal conditions,including current transformer(CT)saturation,errors,and outliers,on the security of differential protection remains an important problem.Motivated by the aforementioned issues,this study accounts for the trajectory distribution discrepancy on Cartesian plane under various conditions and proposes a time-domain differential protection method.In this paper,the trajectory formed by operating and restraining current samples is devel-oped.Subsequently,after considering different operating states,the fault severity levels,and nonideal conditions,the variances in trajectory distribution between internal and external faults are extensively analyzed.On this basis,the Cartesian plane is divided into operating,uncertainty,and restraining zones.Further,the operating and restraining trajectory indices are meticu-lously designed and a protection criterion based on these indices is formed to accurately separate internal faults from other events,unaffected by CT saturation,errors,and outliers.The exceptional performance of the proposed protection method is extensively validated through PSCAD simulations and a hard-ware-in-the-loop testing platform.Regarding the dependability,sensitivity,and security,the proposed protection method outper-forms three state-of-the-art differential protection methods.展开更多
The metabolic state of a cell is closely related to its structure and function in adult mammalian cardiomyocytes.These adult cardiomyocytes primarily use fatty acids as an energy substrate to support heart contraction...The metabolic state of a cell is closely related to its structure and function in adult mammalian cardiomyocytes.These adult cardiomyocytes primarily use fatty acids as an energy substrate to support heart contraction.Recently,Li and his colleagues reported that inhibiting fatty acid oxidation in cardiomyocytes keeps them in an immature state.This influences epigenomic modifications and ultimately increases the proliferation capacity of the cardiomyocytes.展开更多
For years,the study of senescent cells resembled a molecular guessing game.Researchers knew these dormant cells played paradoxical roles-some secreting inflammatory signals that accelerated tissue damage,others releas...For years,the study of senescent cells resembled a molecular guessing game.Researchers knew these dormant cells played paradoxical roles-some secreting inflammatory signals that accelerated tissue damage,others releasing factors to restrain it.Yet traditional tools could only lump all senescent cells into a single category.This blindness persisted until 2024,when Dr.ZHOU Bin’s team at the Shanghai Institute of Biochemistry and Cell Biology(SIBCB).展开更多
Background:Restrained eating,often motivated by the desire to control weight,is prevalent among young female college students and is considered a risk factor for eating disorders.Negative evaluation fear,exacerbated b...Background:Restrained eating,often motivated by the desire to control weight,is prevalent among young female college students and is considered a risk factor for eating disorders.Negative evaluation fear,exacerbated by social pressure,peer comparison,and academic stress,has been identified as a potential contributor to restrained eating behavior.However,research exploring the relationship between negative evaluation fear and restrained eating,particularly in the context of self-esteem and physical appearance perfectionism,remains limited.This study aims to investigate these relationships and design an intervention program to reduce restrained eating behaviors in female college students.Methods:Study 1 involved 617 female college students,using the Physical Appearance Perfectionism Scale,Rosenberg Self-Esteem Scale,Fear of Negative Evaluation Scale,and Dutch Eating Behavior Questionnaire to measure key variables.We examined the relationships between physical appearance perfectionism,self-esteem,fear of negative evaluation,and restrained eating.In Study 2,a 4-week group psychological intervention based on Acceptance and Commitment Therapy(ACT)was implemented with 45 students,divided into experimental,control,and placebo groups.The intervention’s effectiveness was assessed in reducing restrained eating and negative evaluation fear.Results:The study found that fear of negative evaluation significantly predicted restrained eating and physical appearance perfectionism.Physical appearance perfectionism,in turn,positively predicted restrained eating and partially mediated the relationship between negative evaluation fear and restrained eating.Self-esteem moderated this mediation effect.Additionally,the ACT-based intervention significantly reduced fear of negative evaluation and restrained eating behavior in the experimental group.Conclusion:This study identifies fear of negative evaluation and physical appearance perfectionism as key predictors of restrained eating in female college students.Fear of negative evaluation significantly predicted restrained eating,with physical appearance perfectionism partially mediating this relationship.The ACT-based intervention effectively reduced both fear of negative evaluation and restrained eating.These findings highlight the importance of addressing negative evaluation fear and appearance perfectionism in interventions for restrained eating.展开更多
The study aims to understand geometry and evolution of accommodation zones along restraining and releasing bends in strike slip systems which is often complex and characterized by sharp change in polarity,resulting in...The study aims to understand geometry and evolution of accommodation zones along restraining and releasing bends in strike slip systems which is often complex and characterized by sharp change in polarity,resulting in a difficult characterization of traps location.A batch of sandbox modelling experiments was performed using a layered scaled sand material.The setup parameters of the wooden baseplates used in the first two experiments(SS1 and SS2)are basement offset of 6.5 cm/3 cm,90/90stepovers in releasing and restraining bends of total 96 cm length and 25 cm width.The third experiment(SS3)was performed with basement offset of 6.5 cm/3 cm,156/126stepovers in releasing and restraining bends of total 96 cm length and 25 cm width.The experiments were performed with special attention to the role of syn-kinematic sedimentation and the pre-existing structure of the basement.A sequence of pop-up and pull-apart structures was produced.Along the main structures,complex fault trend was compatible with a sinistral riedel distribution and a counterclockwise rotation of pre-existent elements.Change of fault's polarity at depth and dip direction flipping of high angle faults in accommodation zones were clearly observed.Even more,progressive propagation of the pop-up structures produces a spectacular inversion of adjacent extensional structures.Comparing results of the model with the Seagap fault zone,it is possible to put in evidence similar fault orientation and distribution.Internal structures developed were strongly influenced by syn-kinematic sedimentation as observed by characteristic helicoidal shape of growth faults.The analogue models clearly describe how boundary faults of the pull-apart basin along a paired bend,initially characterized by a normal kinematic can be subsequently inverted in the later stages,which can potentially have a strong impact on the petroleum system.展开更多
1.Introduction Cities are responsible for approximately 70%of all anthropogenic greenhouse gas(GHG)emissions and about 60%of all anthropogenic methane(CH4)emissions[1,2].Solid waste disposal sites(including landfills ...1.Introduction Cities are responsible for approximately 70%of all anthropogenic greenhouse gas(GHG)emissions and about 60%of all anthropogenic methane(CH4)emissions[1,2].Solid waste disposal sites(including landfills and dumpsites),which are prevalent in global cities,emit CH4 generated from the anaerobic biodegradation of municipal solid waste(MSW).Notably,the proportions of CH4 emissions from disposal sites surpass 50%of the total CH4 emissions in some megalopolises[3].CH4 has a high global warming potential(GWP),being 28 times stronger than carbon dioxide(CO_(2))over a 100-year period and 80 times stronger over a 20-year period[4].Understanding and mitigating CH4 emissions from solid waste disposal sites is particularly pertinent and pressing,considering that the latest Synthesis Report from the Intergovernmental Panel on Climate Change(IPCC)emphasizes that the current pace of mitigation and adaptation policies and measures falls short of restraining global temperature rise to under 1.5℃ within the 21st century[4].More than 150 countries signed the Global Methane Pledge at the United Nations Climate Change Conference in Glasgow(COP26),which aims to reduce global annual CH4 emissions by 30%by 2030,compared with emissions in 2020[5].展开更多
The ultimate strength of platings under compression is one of the most important factors to be addressed in the ship design.Current Rules for ship structural design generally provide explicit strength check criteria a...The ultimate strength of platings under compression is one of the most important factors to be addressed in the ship design.Current Rules for ship structural design generally provide explicit strength check criteria against buckling for simply supported and clamped platings.Nevertheless,ship platings generally exhibit an intermediate behaviour between the simple support and the clamped conditions,which implies that the torsional stiffness of supporting members should be duly considered.Hence,the main aim of this study is the development of new design formulas for the ultimate strength of platings under uniaxial compression,with short and/or long edges elastically restrained against torsion.In this respect,two benchmark studies are performed.The former is devoted to the development of new equations for the elastic buckling coefficients of platings with edges elastically restrained against torsion,based on the results of the eigenvalue buckling analysis,performed by Ansys Mechanical APDL.The latter investigates the ultimate strength of platings with elastically restrained edges,by systematically varying the plate slenderness ratio and the torsional stiffness of supporting members.Finally,the effectiveness of the new formulation is checked against a wide number of finite element(FE)simulations,to cover the entire design space of ship platings.展开更多
Brain-Machine Interface System Unveiled at Zhongguancun Forum The NeuCyber Array BMI System,a self-developed brain-machine interface(BMI)system from China,was unveiled at the opening ceremony of the 2024 Zhongguancun ...Brain-Machine Interface System Unveiled at Zhongguancun Forum The NeuCyber Array BMI System,a self-developed brain-machine interface(BMI)system from China,was unveiled at the opening ceremony of the 2024 Zhongguancun Forum(ZGC Forum)on April 25 in Beijing.At the forum,a video demonstration revealed a remarkable feat:a monkey,with its hands restrained and soft electrode filaments implanted in its brain,grasped a strawberry with an isolated robotic arm that was controlled by simply using its"thoughts."展开更多
A Series of Manuscripts of Epic of King Gesar Epic of King Gesar is a long narrative epic about the Tibetan legendary hero King Gesar,who subdued demons and monsters,restrained the powerful and helped the weak,and ben...A Series of Manuscripts of Epic of King Gesar Epic of King Gesar is a long narrative epic about the Tibetan legendary hero King Gesar,who subdued demons and monsters,restrained the powerful and helped the weak,and benefited people.展开更多
Notable differences in the structural characteristics and evolution of three adjacent sub-sags,i.e.,the Wenchang sub-sags A,B,and C,on the downthrown side of the Zhu IlI South Fault in the Wenchang Sag,are significant...Notable differences in the structural characteristics and evolution of three adjacent sub-sags,i.e.,the Wenchang sub-sags A,B,and C,on the downthrown side of the Zhu IlI South Fault in the Wenchang Sag,are significant as they affect the formation and distribution of the oil and gas in these three sub-sags.However,the differences in their tectonic evolutions and formation mechanisms have not yet been adequately explained.In this paper,stress analysis,equilibrium profiles,and paleogeomorphic restora-tion,are used to investigate the dynamic settings,formation mechanisms,and influencing factors of the structural deformation related to the formation of the Wenchang Sag based on interpretation of seismic data.The results of the stress analysis suggest clockwise deflection of the regional tensile stress direction from a WNW-ESE trend during the Early Paleocene to NW-SE and NNW-SSE trends during the Eocene,to a nearly N-S trend during the Oligocene,and finally to a NNE-SSW trend during the Miocene.This clockwise rotation of the regional tensile stress direction led to the formation of a dextral strike-slip stress component parallel to the NE-trending Zhu I South Fault.This strike-slip stress component formed a releasing bend in sub-sag A,and may be associated with the continuous subsidence of a thick sedimentary layer in sub-sag A.It also created a restraining bend in sub-sag B,which underwent multiple structural inversions during its extension and subsidence and has a relatively s mall sedimentary thick-ness.The double restraining bend in sub-sag C is considered to have been strongly uplifted and eroded in response to this strike-slip stress component.Four obvious structural inversions in sub-sag B are iden-tified in this paper.These structural inversions correspond to the last four regional tectonic movements.This interpretation suggests that the formation of the structural inversions was likely related to the strong tensile stress and the small intersection angle between the direction of the regional tensile stress and the pre-existing boundary fault.The rotation of the tensile stress direction was responsible for the strike-slip movement on the pre-existing boundary fault and the formation of the releasing bend and restraining bend,which controlled the structural evolutions of the sub-sags.This reasonably explains the differential tectonic evolution of these three sub-sags in the Wenchang Sag,and provides a crucial idea forstructuralanalysisof similarbasins.展开更多
According to the need of popular land surface process models, characteristics and rules of some key land surface process and soil parameters over Gobi in typical arid region of Northwest China are analyzed by using th...According to the need of popular land surface process models, characteristics and rules of some key land surface process and soil parameters over Gobi in typical arid region of Northwest China are analyzed by using the data observed during the intensive observation period of the Dunhuang Land–Surface Process Field Experiment (DLSPFE) (May–June 2000). Using the relative reflection as weighting factor, the weighted mean of the surface albedo over Dunhuang Gobi in typical arid region is calculated and its values are 0.255 ± 0.021. After canceling the interference of the buildings, the mean values of the roughness length averaged with logarithm is 0.0019 ± 0.00071 m. After removing the influence of the oasis, the soil wetness factor computed with data under condition of no precipitation is 0.0045. After removing the influence of the precipitation , the mean values of the soil heat capacity over Dunhuang Gobi in typical arid region is 1.12 × 10<SUP>6</SUP> J m<SUP>−3</SUP>K<SUP>−1</SUP>, a bit smaller than the values observed in HEIFE. But the soil heat diffusivity and conductivity are about one of those observed in HEIFE. The soil water content over Dunhuang Gobi in typical synoptic condition is very little and does not exceed 1% basically.展开更多
文摘In sheet metal forming, drawbeads are often used to control uneven material flow which may cause defects such as wrinkles, fracture, surface distortion and springback. Appropriate setting and adjusting the drawbead force is one of the most important pa- rameters in sheet metal forming process control. This paper derives the model of loop drawbead restraining force (DBRF) using plastic forming theory, and gives the min imum blankholding force. Experiments are carried out to verify the proposed DBRF model. The good agreement between the calculated values and experiments data justi- fies the proposed loop drawbead restraining force model.
基金Supported by Science and Technology Development Foundation of Shanghai (015211009).
文摘Due to complexities of draw-bead restraining force calculated according to theory and depending on sheet metal forming properties experiment testing system, a simplified method to calculate draw-bead restraining force is put forward by experimental method in cup-shaped drawing process. The experimental results were compared with numerical results and proved agreement. It shows the method is effective.
基金This paper was supported by the National "Eleven .Five" Scientific and Technological Supporting project "Test and demonstration for typical region city forest construction technol-ogy(2006BAD03A19) "
文摘The extracts from leaves of Manglietia insignis （Wall） Blume, Manglietia chingii Dandy and Manglietia yuyuanensis Law were prepared by organic solvent extraction and their components were analyzed by GC/MS and quantified. Meanwhile, the free radicals restraining activities were detected. The 21 compounds in M. insignis, 36 compounds in M. chigii and 20 compounds in M. yuyuanensis were identified. There were 11 common components in the extracts from three Manglietia species, and 12 components in two Manglietia species. The results of relative contents of every component in three extracts showed that the main constituents of M. insignis were terpenoids and alkene, amounting to 38.93%, followed by alkane （28.18%）, the nitrogen containing compounds （15.73%） and aromatic compounds （7.23 %）. The main constituents of leaf extract from M. chingii were the terpenoids and alkene, carboxylic acid, alkane and aromatic compounds, amounting to 30.22%, 14.17%, 13.87% and 13.29%, respectively, The main constituents of M. yuyuanensis were alcohol compounds, the terpenoids and alkene, and aromatic compounds, amounting to 28.00%, 25.38% and 18.00% respectively. The results showed that the three extracts had strong function of restraining oxygen free radicals. The ultra oxygen anions activity was restrained at the highest level, when the three extracts were diluted by hundred-fold, whereas the restraining capacity of hydroxyl free radicals reached maximum, when the three extracts were diluted by twenty-fold. The above results provide scientific evidences for further approaching the ecological healthy function of three MangUetia species
文摘The method of planning acceleration is discussed to restrain the residual vibration of flexible arm. Based on the built mathematical model of the flexible arm, the equations of vibration with acceleration,vibration frequency,damping and time are obtained theoretically.According to the vibration frequency and damping, the suitable acceleration is executed experimentally to the flexible arm at the corresponding time. The result shows that this way can give rise to good effect to restrain the residual vibration.
文摘The effects of various combustion conditions (i. e. particle size of coals, oxygen concentration in combustion gas and coal content in the fuel bed, etc.), on reducing conversion of NO_x during coal combustion were studied. Under the present combustion conditions, coals with smaller particle size gave the lower conversion of NO_x, and as expected that an decrease in overall stoichiometric ratio, whether by an decrease in O_2 content in combustion gas or by an increase in coal content in fuel bed would lead to a lower conversion of NO_x. In order to investigate the effect of metallic oxide layers on restraining NO_x formation, the combustion experiments for coal granules with adhering layer of various metallic oxides including Fe_2O_3, Ni_2O_3 and mixed oxides Fe-Ni-O_x were conducted in a packed bed combustor. The combustion experiments have shown that most of adhering materials gave considerable effect on reduction of NO_x emission during coal combustion.
基金Funded by the NSFC (No.50578027)the Key Subject Foundation of Henan Province (No.504906)the Doctor Foundation of Henan Polytechnic University (No.B2009-2)
文摘The expansive behaviors of the expensive concrete under different restraining conditions were systemically studied. The experimental results indicate that expansive deformation obviously increases before 10 days and tends to be constant after 25 days regardless of the restraining conditions. The mixture ratio of expansive cement and restraining conditions are the main factors affecting expansive deformation. Self-stress can be obtained when the expansive deformation is restrained. The higher self-stress could be obtained when the expensive concrete is restrained by steel tube. For specimens under steel tube restraining, the wall thickness and the length of the steel tube have important influence on self-stress. Both the radial self-stress and axial self-stress in concrete core increase when wall thickness or length of the steel tube increases.
基金Supported by the School Management Project of Xi an Polytechnic University(09XG38)
文摘The new rural cooperative medical system has achieved periodical achievements since its establishment.Nevertheless,there are many factors hampering the development of the new system,such as the high cost,the difficulties in fund procurement,the lack of management,the narrow coverage of benefit,the ineffective constraint to the designated medical institutions,the high fund balance rate,and the poor medical facilities and services in rural areas.Countermeasures are put forward to solve these problems,including improving the system design,expanding the coverage of the system,expanding the fund sources,reducing the financing costs,strengthening the fund supervision,enhancing the supervision of designated medical institutions,and improving the capacity of health services in rural areas.
基金supported in part by the National Natural Science Foundation of China (No.52277132)in part by the Fundamental Research Funds for the Central Universities (No.2024JCCXJD01)
文摘Battery energy storage stations(BESSs)pose sever-al challenges for both phasor-based differential protection and the newly-proposed time-domain differential protection.These challenges include low sensitivity and even rejection.Besides,the negative impact of various nonideal conditions,including current transformer(CT)saturation,errors,and outliers,on the security of differential protection remains an important problem.Motivated by the aforementioned issues,this study accounts for the trajectory distribution discrepancy on Cartesian plane under various conditions and proposes a time-domain differential protection method.In this paper,the trajectory formed by operating and restraining current samples is devel-oped.Subsequently,after considering different operating states,the fault severity levels,and nonideal conditions,the variances in trajectory distribution between internal and external faults are extensively analyzed.On this basis,the Cartesian plane is divided into operating,uncertainty,and restraining zones.Further,the operating and restraining trajectory indices are meticu-lously designed and a protection criterion based on these indices is formed to accurately separate internal faults from other events,unaffected by CT saturation,errors,and outliers.The exceptional performance of the proposed protection method is extensively validated through PSCAD simulations and a hard-ware-in-the-loop testing platform.Regarding the dependability,sensitivity,and security,the proposed protection method outper-forms three state-of-the-art differential protection methods.
文摘The metabolic state of a cell is closely related to its structure and function in adult mammalian cardiomyocytes.These adult cardiomyocytes primarily use fatty acids as an energy substrate to support heart contraction.Recently,Li and his colleagues reported that inhibiting fatty acid oxidation in cardiomyocytes keeps them in an immature state.This influences epigenomic modifications and ultimately increases the proliferation capacity of the cardiomyocytes.
文摘For years,the study of senescent cells resembled a molecular guessing game.Researchers knew these dormant cells played paradoxical roles-some secreting inflammatory signals that accelerated tissue damage,others releasing factors to restrain it.Yet traditional tools could only lump all senescent cells into a single category.This blindness persisted until 2024,when Dr.ZHOU Bin’s team at the Shanghai Institute of Biochemistry and Cell Biology(SIBCB).
文摘Background:Restrained eating,often motivated by the desire to control weight,is prevalent among young female college students and is considered a risk factor for eating disorders.Negative evaluation fear,exacerbated by social pressure,peer comparison,and academic stress,has been identified as a potential contributor to restrained eating behavior.However,research exploring the relationship between negative evaluation fear and restrained eating,particularly in the context of self-esteem and physical appearance perfectionism,remains limited.This study aims to investigate these relationships and design an intervention program to reduce restrained eating behaviors in female college students.Methods:Study 1 involved 617 female college students,using the Physical Appearance Perfectionism Scale,Rosenberg Self-Esteem Scale,Fear of Negative Evaluation Scale,and Dutch Eating Behavior Questionnaire to measure key variables.We examined the relationships between physical appearance perfectionism,self-esteem,fear of negative evaluation,and restrained eating.In Study 2,a 4-week group psychological intervention based on Acceptance and Commitment Therapy(ACT)was implemented with 45 students,divided into experimental,control,and placebo groups.The intervention’s effectiveness was assessed in reducing restrained eating and negative evaluation fear.Results:The study found that fear of negative evaluation significantly predicted restrained eating and physical appearance perfectionism.Physical appearance perfectionism,in turn,positively predicted restrained eating and partially mediated the relationship between negative evaluation fear and restrained eating.Self-esteem moderated this mediation effect.Additionally,the ACT-based intervention significantly reduced fear of negative evaluation and restrained eating behavior in the experimental group.Conclusion:This study identifies fear of negative evaluation and physical appearance perfectionism as key predictors of restrained eating in female college students.Fear of negative evaluation significantly predicted restrained eating,with physical appearance perfectionism partially mediating this relationship.The ACT-based intervention effectively reduced both fear of negative evaluation and restrained eating.These findings highlight the importance of addressing negative evaluation fear and appearance perfectionism in interventions for restrained eating.
基金This research paper was prepared from the experimental data simulated with Sandbox analogy modelling machine in the Geomodel laboratory of College of Earth sciences,University of Dodoma.Our appreciation goes to senior LabEngineer Mr Audax Kiwango for his tireless technical support in operating the Sandbox machine and Statoil Tanzania(Equinor)for providing information of structural architecture of their play。
文摘The study aims to understand geometry and evolution of accommodation zones along restraining and releasing bends in strike slip systems which is often complex and characterized by sharp change in polarity,resulting in a difficult characterization of traps location.A batch of sandbox modelling experiments was performed using a layered scaled sand material.The setup parameters of the wooden baseplates used in the first two experiments(SS1 and SS2)are basement offset of 6.5 cm/3 cm,90/90stepovers in releasing and restraining bends of total 96 cm length and 25 cm width.The third experiment(SS3)was performed with basement offset of 6.5 cm/3 cm,156/126stepovers in releasing and restraining bends of total 96 cm length and 25 cm width.The experiments were performed with special attention to the role of syn-kinematic sedimentation and the pre-existing structure of the basement.A sequence of pop-up and pull-apart structures was produced.Along the main structures,complex fault trend was compatible with a sinistral riedel distribution and a counterclockwise rotation of pre-existent elements.Change of fault's polarity at depth and dip direction flipping of high angle faults in accommodation zones were clearly observed.Even more,progressive propagation of the pop-up structures produces a spectacular inversion of adjacent extensional structures.Comparing results of the model with the Seagap fault zone,it is possible to put in evidence similar fault orientation and distribution.Internal structures developed were strongly influenced by syn-kinematic sedimentation as observed by characteristic helicoidal shape of growth faults.The analogue models clearly describe how boundary faults of the pull-apart basin along a paired bend,initially characterized by a normal kinematic can be subsequently inverted in the later stages,which can potentially have a strong impact on the petroleum system.
基金Nanyang Technological University(NTU),Singapore,for providing research scholarships for this study.The authors thank the supports from Debris of the Anthropocene to Resources(DotA2)Lab at NTU.
文摘1.Introduction Cities are responsible for approximately 70%of all anthropogenic greenhouse gas(GHG)emissions and about 60%of all anthropogenic methane(CH4)emissions[1,2].Solid waste disposal sites(including landfills and dumpsites),which are prevalent in global cities,emit CH4 generated from the anaerobic biodegradation of municipal solid waste(MSW).Notably,the proportions of CH4 emissions from disposal sites surpass 50%of the total CH4 emissions in some megalopolises[3].CH4 has a high global warming potential(GWP),being 28 times stronger than carbon dioxide(CO_(2))over a 100-year period and 80 times stronger over a 20-year period[4].Understanding and mitigating CH4 emissions from solid waste disposal sites is particularly pertinent and pressing,considering that the latest Synthesis Report from the Intergovernmental Panel on Climate Change(IPCC)emphasizes that the current pace of mitigation and adaptation policies and measures falls short of restraining global temperature rise to under 1.5℃ within the 21st century[4].More than 150 countries signed the Global Methane Pledge at the United Nations Climate Change Conference in Glasgow(COP26),which aims to reduce global annual CH4 emissions by 30%by 2030,compared with emissions in 2020[5].
文摘The ultimate strength of platings under compression is one of the most important factors to be addressed in the ship design.Current Rules for ship structural design generally provide explicit strength check criteria against buckling for simply supported and clamped platings.Nevertheless,ship platings generally exhibit an intermediate behaviour between the simple support and the clamped conditions,which implies that the torsional stiffness of supporting members should be duly considered.Hence,the main aim of this study is the development of new design formulas for the ultimate strength of platings under uniaxial compression,with short and/or long edges elastically restrained against torsion.In this respect,two benchmark studies are performed.The former is devoted to the development of new equations for the elastic buckling coefficients of platings with edges elastically restrained against torsion,based on the results of the eigenvalue buckling analysis,performed by Ansys Mechanical APDL.The latter investigates the ultimate strength of platings with elastically restrained edges,by systematically varying the plate slenderness ratio and the torsional stiffness of supporting members.Finally,the effectiveness of the new formulation is checked against a wide number of finite element(FE)simulations,to cover the entire design space of ship platings.
文摘Brain-Machine Interface System Unveiled at Zhongguancun Forum The NeuCyber Array BMI System,a self-developed brain-machine interface(BMI)system from China,was unveiled at the opening ceremony of the 2024 Zhongguancun Forum(ZGC Forum)on April 25 in Beijing.At the forum,a video demonstration revealed a remarkable feat:a monkey,with its hands restrained and soft electrode filaments implanted in its brain,grasped a strawberry with an isolated robotic arm that was controlled by simply using its"thoughts."
文摘A Series of Manuscripts of Epic of King Gesar Epic of King Gesar is a long narrative epic about the Tibetan legendary hero King Gesar,who subdued demons and monsters,restrained the powerful and helped the weak,and benefited people.
基金supported by the National Natural Science Foundation of China(Grant No.9132820142006068)Shandong Special Fund of Qingdao National Laboratory of Marine Science and Technology(No.2021QNLM020001-1).
文摘Notable differences in the structural characteristics and evolution of three adjacent sub-sags,i.e.,the Wenchang sub-sags A,B,and C,on the downthrown side of the Zhu IlI South Fault in the Wenchang Sag,are significant as they affect the formation and distribution of the oil and gas in these three sub-sags.However,the differences in their tectonic evolutions and formation mechanisms have not yet been adequately explained.In this paper,stress analysis,equilibrium profiles,and paleogeomorphic restora-tion,are used to investigate the dynamic settings,formation mechanisms,and influencing factors of the structural deformation related to the formation of the Wenchang Sag based on interpretation of seismic data.The results of the stress analysis suggest clockwise deflection of the regional tensile stress direction from a WNW-ESE trend during the Early Paleocene to NW-SE and NNW-SSE trends during the Eocene,to a nearly N-S trend during the Oligocene,and finally to a NNE-SSW trend during the Miocene.This clockwise rotation of the regional tensile stress direction led to the formation of a dextral strike-slip stress component parallel to the NE-trending Zhu I South Fault.This strike-slip stress component formed a releasing bend in sub-sag A,and may be associated with the continuous subsidence of a thick sedimentary layer in sub-sag A.It also created a restraining bend in sub-sag B,which underwent multiple structural inversions during its extension and subsidence and has a relatively s mall sedimentary thick-ness.The double restraining bend in sub-sag C is considered to have been strongly uplifted and eroded in response to this strike-slip stress component.Four obvious structural inversions in sub-sag B are iden-tified in this paper.These structural inversions correspond to the last four regional tectonic movements.This interpretation suggests that the formation of the structural inversions was likely related to the strong tensile stress and the small intersection angle between the direction of the regional tensile stress and the pre-existing boundary fault.The rotation of the tensile stress direction was responsible for the strike-slip movement on the pre-existing boundary fault and the formation of the releasing bend and restraining bend,which controlled the structural evolutions of the sub-sags.This reasonably explains the differential tectonic evolution of these three sub-sags in the Wenchang Sag,and provides a crucial idea forstructuralanalysisof similarbasins.
基金This research was sponsored by the National Key Program for Developing Basic Sciences Research on the Formation Mechanism and Pr
文摘According to the need of popular land surface process models, characteristics and rules of some key land surface process and soil parameters over Gobi in typical arid region of Northwest China are analyzed by using the data observed during the intensive observation period of the Dunhuang Land–Surface Process Field Experiment (DLSPFE) (May–June 2000). Using the relative reflection as weighting factor, the weighted mean of the surface albedo over Dunhuang Gobi in typical arid region is calculated and its values are 0.255 ± 0.021. After canceling the interference of the buildings, the mean values of the roughness length averaged with logarithm is 0.0019 ± 0.00071 m. After removing the influence of the oasis, the soil wetness factor computed with data under condition of no precipitation is 0.0045. After removing the influence of the precipitation , the mean values of the soil heat capacity over Dunhuang Gobi in typical arid region is 1.12 × 10<SUP>6</SUP> J m<SUP>−3</SUP>K<SUP>−1</SUP>, a bit smaller than the values observed in HEIFE. But the soil heat diffusivity and conductivity are about one of those observed in HEIFE. The soil water content over Dunhuang Gobi in typical synoptic condition is very little and does not exceed 1% basically.
