A thermoviscoelastic modeling approach is developed to predict the recovery behaviors of the thermally activated amorphous shape memory polymers(SMPs)based on the generalized finite deformation viscoelasticity theory....A thermoviscoelastic modeling approach is developed to predict the recovery behaviors of the thermally activated amorphous shape memory polymers(SMPs)based on the generalized finite deformation viscoelasticity theory.In this paper,a series of moduli and relaxation times of the generalized Maxwell model is estimated from the stress relaxation master curve by using the nonlinear regression(NLREG)method.Assuming that the amorphous SMPs are approximately incompressible isotropic elastomers in the rubbery state,the hyperelastic response of the materials is well modeled with a hyperelastic model in Ogden form.In addition,the Williams-Landel-Ferry(WLF)equation is used to describe the horizontal shift factor obtained with time-temperature superposition principle(TTSP).The finite element simulations show good agreement with the experimental thermomechanical behaviors.Moreover,the possibility of developing a temperature-responsive intravascular stent with the SMP studied here is investigated in terms of its thermomechanical property.Therefore,it can be concluded that the model has good prediction capabilities for the recovery behaviors of amorphous SMPs.展开更多
Approaches to the study of formation keeping for multiple mobile robots are analyzed and a behavior-based robot model is built in this paper. And, a kind of coordination architecture is presented, which is similar to ...Approaches to the study of formation keeping for multiple mobile robots are analyzed and a behavior-based robot model is built in this paper. And, a kind of coordination architecture is presented, which is similar to the infantry squad organization and is used to realize multiple mobile robots to keep formations. Simulations verify the validity of the approach to keep formation, which combines the behavior-based method and formation feedback. The effects of formation feedback on the performance of the system are analyzed.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 linear variable separation approach is successfully extended to (1+1)-dimensional Korteweg-de Vries (KdV) type models related to Schrǒdinger system. Some significant types of solitons such as compacton, peakon, a...The linear variable separation approach is successfully extended to (1+1)-dimensional Korteweg-de Vries (KdV) type models related to Schrǒdinger system. Some significant types of solitons such as compacton, peakon, and loop solutions with periodic behavior are simultaneously derived from the (1+1)-dimensional soliton system by entrancing appropriate piecewise smooth functions and multivalued functions.展开更多
The one-dimensional understanding of political efficacy has developed into the two-dimensional understanding,including the internal efficacy and the external efficacy.There are various measurements concerning politica...The one-dimensional understanding of political efficacy has developed into the two-dimensional understanding,including the internal efficacy and the external efficacy.There are various measurements concerning political efficacy researched and acceptable abroad.In China,scholars localize such measurements in order to adapt to the Chinese national conditions.After researches from the perspective of sociology,social psychology,rational choice and participative behavior,scholars continue to research political efficacy from various perspectives.However,as far as the research perspective,research content and research approach are concerned,China still has a long way to go.展开更多
With the help of the Maple symbolic computation system and the projective equation approach,a new family of variable separation solutions with arbitrary functions for the（2＋1）-dimensional generalized Breor-Kaup（GB...With the help of the Maple symbolic computation system and the projective equation approach,a new family of variable separation solutions with arbitrary functions for the（2＋1）-dimensional generalized Breor-Kaup（GBK） system is derived.Based on the derived solitary wave solution,some chaotic behaviors of the GBK system are investigated.展开更多
【目的】开展自然保护地精细化分区和管控,是实现新阶段国家公园和自然保护地精准化、适应性管理的基础,但目前分区方法对于保护对象行为需求,人-野生动物关联性、动态性、适应性认识仍有限。【方法】基于现代生态系统管理理论,采用Max...【目的】开展自然保护地精细化分区和管控,是实现新阶段国家公园和自然保护地精准化、适应性管理的基础,但目前分区方法对于保护对象行为需求,人-野生动物关联性、动态性、适应性认识仍有限。【方法】基于现代生态系统管理理论,采用MaxEnt物种分布模型和多种空间分析模型方法,对保护野生动物行为及保护需求,以及与人类行为空间交互关系进行系统分析,提出自然保护地精细化分区管控的行为分析方法(behavior-based approach for refined zoning and management,BAZM)。【结果】以云南大山包黑颈鹤国家级自然保护区人鹤系统为例,识别出黑颈鹤夜栖地最小接近距离400 m缓冲区及重要湿地恢复区为核心保护区;辨识出保护区45%面积为生境维护区,保证黑颈鹤主要觅食区食源安全和维持人鹤共生系统,将文化体验区、风景展示区、传统生产区、综合服务区共同划定为一般控制区;在此基础上提出外围协调区,协调黑颈鹤区域越冬和迁徙安全;最终提出3+N的细化分区以及精准化管控和适应性管理策略。【结论】该方法具有较强的适应性、科学性和可操作性,对完善中国国家公园和自然保护地规划理论方法、推动精准化保护和适应性管理具有重要意义。展开更多
基金supported by the Natural Science Foundation of Jiangsu Province of China (No. BK20170759)the National Natural Science Foundation of China (No. 11572153)+3 种基金Jiangsu Government Scholarship for Overseas Studiesa project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)Outstanding Scientific and Technological Innovation Team in Colleges and Universities of Jiangsu Provincethe Doctor Special Foundation and the Research Fund of Nanjing Institute of Technology (Nos. ZKJ201603, YKJ201312)
文摘A thermoviscoelastic modeling approach is developed to predict the recovery behaviors of the thermally activated amorphous shape memory polymers(SMPs)based on the generalized finite deformation viscoelasticity theory.In this paper,a series of moduli and relaxation times of the generalized Maxwell model is estimated from the stress relaxation master curve by using the nonlinear regression(NLREG)method.Assuming that the amorphous SMPs are approximately incompressible isotropic elastomers in the rubbery state,the hyperelastic response of the materials is well modeled with a hyperelastic model in Ogden form.In addition,the Williams-Landel-Ferry(WLF)equation is used to describe the horizontal shift factor obtained with time-temperature superposition principle(TTSP).The finite element simulations show good agreement with the experimental thermomechanical behaviors.Moreover,the possibility of developing a temperature-responsive intravascular stent with the SMP studied here is investigated in terms of its thermomechanical property.Therefore,it can be concluded that the model has good prediction capabilities for the recovery behaviors of amorphous SMPs.
文摘Approaches to the study of formation keeping for multiple mobile robots are analyzed and a behavior-based robot model is built in this paper. And, a kind of coordination architecture is presented, which is similar to the infantry squad organization and is used to realize multiple mobile robots to keep formations. Simulations verify the validity of the approach to keep formation, which combines the behavior-based method and formation feedback. The effects of formation feedback on the performance of the system are analyzed.
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.
基金The project supported by National Natural Science Foundation of China under Grant No. 10172056, and the Natural Science Foundation of Zhejiang Province of China under Grant No. Y604106 and the Natural Science Foundation of Zhejiang Lishui University unde
文摘The linear variable separation approach is successfully extended to (1+1)-dimensional Korteweg-de Vries (KdV) type models related to Schrǒdinger system. Some significant types of solitons such as compacton, peakon, and loop solutions with periodic behavior are simultaneously derived from the (1+1)-dimensional soliton system by entrancing appropriate piecewise smooth functions and multivalued functions.
基金the phased achievement of the youth project of the humanities and social science research of the Ministry of Education-Empirical Analysis of the Village Committee Election of A County in 2011.(No.:10YJC810020)
文摘The one-dimensional understanding of political efficacy has developed into the two-dimensional understanding,including the internal efficacy and the external efficacy.There are various measurements concerning political efficacy researched and acceptable abroad.In China,scholars localize such measurements in order to adapt to the Chinese national conditions.After researches from the perspective of sociology,social psychology,rational choice and participative behavior,scholars continue to research political efficacy from various perspectives.However,as far as the research perspective,research content and research approach are concerned,China still has a long way to go.
基金Project supported by the Natural Science Foundation of Zhejiang Province,China (Grant Nos. Y6100257,Y6090545,and Y6110140)the Scientific Research Fund of Zhejiang Provincial Education Department,China (Grant No. Z201120169)
文摘With the help of the Maple symbolic computation system and the projective equation approach,a new family of variable separation solutions with arbitrary functions for the（2＋1）-dimensional generalized Breor-Kaup（GBK） system is derived.Based on the derived solitary wave solution,some chaotic behaviors of the GBK system are investigated.
文摘【目的】开展自然保护地精细化分区和管控,是实现新阶段国家公园和自然保护地精准化、适应性管理的基础,但目前分区方法对于保护对象行为需求,人-野生动物关联性、动态性、适应性认识仍有限。【方法】基于现代生态系统管理理论,采用MaxEnt物种分布模型和多种空间分析模型方法,对保护野生动物行为及保护需求,以及与人类行为空间交互关系进行系统分析,提出自然保护地精细化分区管控的行为分析方法(behavior-based approach for refined zoning and management,BAZM)。【结果】以云南大山包黑颈鹤国家级自然保护区人鹤系统为例,识别出黑颈鹤夜栖地最小接近距离400 m缓冲区及重要湿地恢复区为核心保护区;辨识出保护区45%面积为生境维护区,保证黑颈鹤主要觅食区食源安全和维持人鹤共生系统,将文化体验区、风景展示区、传统生产区、综合服务区共同划定为一般控制区;在此基础上提出外围协调区,协调黑颈鹤区域越冬和迁徙安全;最终提出3+N的细化分区以及精准化管控和适应性管理策略。【结论】该方法具有较强的适应性、科学性和可操作性,对完善中国国家公园和自然保护地规划理论方法、推动精准化保护和适应性管理具有重要意义。
