Currently,more than ten ultrahigh arch dams have been constructed or are being constructed in China.Safety control is essential to long-term operation of these dams.This study employed the flexibility coefficient and ...Currently,more than ten ultrahigh arch dams have been constructed or are being constructed in China.Safety control is essential to long-term operation of these dams.This study employed the flexibility coefficient and plastic complementary energy norm to assess the structural safety of arch dams.A comprehensive analysis was conducted,focusing on differences among conventional methods in characterizing the structural behavior of the Xiaowan arch dam in China.Subsequently,the spatiotemporal characteristics of the measured performance of the Xiaowan dam were explored,including periodicity,convergence,and time-effect characteristics.These findings revealed the governing mechanism of main factors.Furthermore,a heterogeneous spatial panel vector model was developed,considering both common factors and specific factors affecting the safety and performance of arch dams.This model aims to comprehensively illustrate spatial heterogeneity between the entire structure and local regions,introducing a specific effect quantity to characterize local deformation differences.Ultimately,the proposed model was applied to the Xiaowan arch dam,accurately quantifying the spatiotemporal heterogeneity of dam performance.Additionally,the spatiotemporal distri-bution characteristics of environmental load effects on different parts of the dam were reasonably interpreted.Validation of the model prediction enhances its credibility,leading to the formulation of health diagnosis criteria for future long-term operation of the Xiaowan dam.The findings not only enhance the predictive ability and timely control of ultrahigh arch dams'performance but also provide a crucial basis for assessing the effectiveness of engineering treatment measures.展开更多
The importance of nutrient provisions and weaning methods for calves has been well established over the past few years,while as increasing interest has focused on contribution of animal behavior and their overall perf...The importance of nutrient provisions and weaning methods for calves has been well established over the past few years,while as increasing interest has focused on contribution of animal behavior and their overall performance in production regimes.The present study investigated the effects of feeding methods and space allowance on growth performance,individual and social behaviors in Holstein calves.Twenty-four Chinese Holstein male and female calves were allocated to either an individual or group of 6 and fed either with a bucket or a teat.Milk replacer,calf starter,and Chinese wildrye were offered during the experiment.A fecal index used in the present study was defined as the total fecal scores/total number of calves in each treatment.The results showed that there was no significant difference among the 4 treatments in terms of feed intake,body weight,average daily gain,and fecal index.For the feeding behaviors,the ingesting milk time and ingesting milk rate were significantly affected by space allowance,while the feeding methods showed a significant influence on the bunting behavior of the calves.There was no significant difference among the 4 treatments in terms of licking fixtures,self-grooming,and lying down behaviors,irrespective of the feeding method or space allowance.However,sucking an empty bucket or the teat was significantly affected by the feeding method.Several selected group behaviors were examined in the present study,and similar values for sniffing the other calves,social grooming,and cross-sucking behaviors were observed.Overall,the present study demonstrated that different feeding methods and space allowances had a significant effect on the feeding behavior of calves,while the feed intake,growth performance,health condition,individual and group social behaviors were not significantly influenced.Furthermore,under intensified production systems,Holstein calves raised in a group may obtain a similar production performance,thus reducing management input and profitability compared with those kept individually.However,there may be competition during the feeding period.展开更多
The purpose of this paper is to discuss recent findings in neuroscience that can be useful to architecture.Knowing the working patterns of the brain and how space affects cerebral functions can help architects design ...The purpose of this paper is to discuss recent findings in neuroscience that can be useful to architecture.Knowing the working patterns of the brain and how space affects cerebral functions can help architects design buildings that improve the user’s behavior,performance and well-being.The built environment has a direct impact on the human brain.Social relations,focus,cognition,creativity,memory and well-being can be influenced by the surrounding physical space.Although it is not possible to create the perfect room,the space can be used in a strategic way,depending on the task that individuals are supposed to do there and depending on the people(age,gender,culture)who will make use of the space.Schools can be designed in a way to improve cognition,learning and memorization;hospital buildings can help improving recovery;workspaces can improve performance,creativity and collaboration.Above all,all spaces of long occupation should be designed in a way to improve well-being.How can architecture change automatic behaviors and nudge people to behave in a healthier way?Can architects create buildings and cities that improve socialization and happiness?Can criminality levels drop due to changes on the way the environments are designed?These are some of the questions that will be discussed in this paper.展开更多
Behaviors,immunities and growth performances of suckling calves to either fed milk through barrel feeding or artificial nipple feeding were investigated in this study.Seventy-two newborn female suckling Holstein calve...Behaviors,immunities and growth performances of suckling calves to either fed milk through barrel feeding or artificial nipple feeding were investigated in this study.Seventy-two newborn female suckling Holstein calves were selected and divided into two treatments which fed regular milk through milk barrels or artificial nipples.The behaviors′parameters were measured on 14,29 and 44 days.Body weight and body size of the calves were recorded on 15,30 and 45 days.Immune indicators were collected in quiet situation on 15,30 and 45 days.Compared with the barrel feeding method,calves fed by artificial nipples had less non-nutritive behaviors,stronger growth performances and higher immune levels.Artificial nipples gave calves sucking conditions and reduced the motivation of calves to suck each other,which might promote the development of complex stomachs,allow food to be better digested and more effective.It also reduced cross-infection indirectly which increased the calves'immunities.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52079046).
文摘Currently,more than ten ultrahigh arch dams have been constructed or are being constructed in China.Safety control is essential to long-term operation of these dams.This study employed the flexibility coefficient and plastic complementary energy norm to assess the structural safety of arch dams.A comprehensive analysis was conducted,focusing on differences among conventional methods in characterizing the structural behavior of the Xiaowan arch dam in China.Subsequently,the spatiotemporal characteristics of the measured performance of the Xiaowan dam were explored,including periodicity,convergence,and time-effect characteristics.These findings revealed the governing mechanism of main factors.Furthermore,a heterogeneous spatial panel vector model was developed,considering both common factors and specific factors affecting the safety and performance of arch dams.This model aims to comprehensively illustrate spatial heterogeneity between the entire structure and local regions,introducing a specific effect quantity to characterize local deformation differences.Ultimately,the proposed model was applied to the Xiaowan arch dam,accurately quantifying the spatiotemporal heterogeneity of dam performance.Additionally,the spatiotemporal distri-bution characteristics of environmental load effects on different parts of the dam were reasonably interpreted.Validation of the model prediction enhances its credibility,leading to the formulation of health diagnosis criteria for future long-term operation of the Xiaowan dam.The findings not only enhance the predictive ability and timely control of ultrahigh arch dams'performance but also provide a crucial basis for assessing the effectiveness of engineering treatment measures.
基金supported by the Earmarked Fund for Beijing Dairy Industry Innovation Consortium of Agriculture Research System (BAIC06-2016)the Beijing Key Laboratory for Dairy Cow Nutrition, the National Key Technology R&D Program of China (2012BAD12B06)the Key Laboratory of Feed Biotechnology, the Ministry of Agriculture of the People’s Republic of China
文摘The importance of nutrient provisions and weaning methods for calves has been well established over the past few years,while as increasing interest has focused on contribution of animal behavior and their overall performance in production regimes.The present study investigated the effects of feeding methods and space allowance on growth performance,individual and social behaviors in Holstein calves.Twenty-four Chinese Holstein male and female calves were allocated to either an individual or group of 6 and fed either with a bucket or a teat.Milk replacer,calf starter,and Chinese wildrye were offered during the experiment.A fecal index used in the present study was defined as the total fecal scores/total number of calves in each treatment.The results showed that there was no significant difference among the 4 treatments in terms of feed intake,body weight,average daily gain,and fecal index.For the feeding behaviors,the ingesting milk time and ingesting milk rate were significantly affected by space allowance,while the feeding methods showed a significant influence on the bunting behavior of the calves.There was no significant difference among the 4 treatments in terms of licking fixtures,self-grooming,and lying down behaviors,irrespective of the feeding method or space allowance.However,sucking an empty bucket or the teat was significantly affected by the feeding method.Several selected group behaviors were examined in the present study,and similar values for sniffing the other calves,social grooming,and cross-sucking behaviors were observed.Overall,the present study demonstrated that different feeding methods and space allowances had a significant effect on the feeding behavior of calves,while the feed intake,growth performance,health condition,individual and group social behaviors were not significantly influenced.Furthermore,under intensified production systems,Holstein calves raised in a group may obtain a similar production performance,thus reducing management input and profitability compared with those kept individually.However,there may be competition during the feeding period.
文摘The purpose of this paper is to discuss recent findings in neuroscience that can be useful to architecture.Knowing the working patterns of the brain and how space affects cerebral functions can help architects design buildings that improve the user’s behavior,performance and well-being.The built environment has a direct impact on the human brain.Social relations,focus,cognition,creativity,memory and well-being can be influenced by the surrounding physical space.Although it is not possible to create the perfect room,the space can be used in a strategic way,depending on the task that individuals are supposed to do there and depending on the people(age,gender,culture)who will make use of the space.Schools can be designed in a way to improve cognition,learning and memorization;hospital buildings can help improving recovery;workspaces can improve performance,creativity and collaboration.Above all,all spaces of long occupation should be designed in a way to improve well-being.How can architecture change automatic behaviors and nudge people to behave in a healthier way?Can architects create buildings and cities that improve socialization and happiness?Can criminality levels drop due to changes on the way the environments are designed?These are some of the questions that will be discussed in this paper.
基金Supported by the National Science and Technology Support Project(2012BAD12B05)。
文摘Behaviors,immunities and growth performances of suckling calves to either fed milk through barrel feeding or artificial nipple feeding were investigated in this study.Seventy-two newborn female suckling Holstein calves were selected and divided into two treatments which fed regular milk through milk barrels or artificial nipples.The behaviors′parameters were measured on 14,29 and 44 days.Body weight and body size of the calves were recorded on 15,30 and 45 days.Immune indicators were collected in quiet situation on 15,30 and 45 days.Compared with the barrel feeding method,calves fed by artificial nipples had less non-nutritive behaviors,stronger growth performances and higher immune levels.Artificial nipples gave calves sucking conditions and reduced the motivation of calves to suck each other,which might promote the development of complex stomachs,allow food to be better digested and more effective.It also reduced cross-infection indirectly which increased the calves'immunities.
