复材网片泥浆加固土坯砌体轴心受压性能试验研究

土坯砌体短柱加固选用GFRP格栅和钢丝网两种材料,对3种GFRP格栅及2种钢丝网的8种加固方式进行了轴压试验,发现GFRP格栅和钢丝网加固能够提高试件的抗压强度,格栅加固试件的抗压强度平均值提升12.33％～37.0％,钢丝网加固试件的抗压强度平均值提升29.33％～56.67％,试件的变形能力和整体性也得到了显著改善;GFRP格栅的单双层加固的效果近似,刚度大的钢丝网比刚度小的加固效果要好,GFRP格栅单层加固效果比单层钢丝网要好;所有加固方法中双层钢丝网加固效果最好.     

纤维增强沙漠砂砂浆砖砌体轴心受压性能试验研究

为了研究沙漠砂砂浆和CBF纤维增强砂浆对砖砌体轴心受压性能的影响,设计了4组砂浆配合比,并砌筑4组砖砌体轴心受压试件,以普通砂砂浆砖砌体作为对比组,研究沙漠砂砂浆和纤维增强砂浆砖砌体轴心受压性能,结果表明：可以配制出与普通砂砂浆相同强度等级的沙漠砂砂浆,沙漠砂砂浆砌体轴心受压性能和普通砂砂浆砖砌体类似,都表现出明显的脆性破坏特征;0.1%CBF纤维掺量和20%沙漠砂替代率为最优组合,其轴心受压脆性破坏程度明显降低,抗压强度和弹性模量明显高于普通砂砂浆砖砌体。     

Phylogenetic and Ontogenetic Learning in a Colony of Interacting Robots

The objective of this paper is to describe the development of a specific theory of interactions and learning among multiple robots performing certain tasks. One of the primary objectives of the research was to study the feasibility of a robot colony in achieving global objectives, when each individual robot is provided only with local goals and local information. In order to achieve this objective the paper introduces a novel cognitive architecture for the individual behavior of robots in a colony. Experimental investigation of the properties of the colony demonstrates its ability to achieve global goals, such as the gathering of objects, and to improve its performance as a result of learning, without explicit instructions for cooperation. Since this architecture is based on representation of the likes and dislikes of the robots, it is called the Tropism System Cognitive Architecture. This paper addresses learning in the framework of the cognitive architecture, specifically, phylogenetic and ontogenetic learning by the robots. The results show that learning is indeed possible with the Tropism Architecture, that the ability of a simulated robot colony to perform a gathering task improves with practice and that it can further improve with evolution over successive generations. Experimental results also show that the variability of the results decreases over successive generations.     

Tropism-based cognition: a novel software architecture for agents in colonies

A novel architecture for agents in colonies has been developed in order to investigate certain forms of group interaction. Specifically, we are interested in the extent to which overall goals for a colony can be achieved when each agent is only aware of limited local goals, whether the architecture allows for emergence of unexpected behaviour, and whether explicit communication among agents facilitates or hinders task performance. The architecture supports several forms of learning. Large colonies of agents (as many as 100) have been studied in simulation experiments, where they carried out fetch-and-carry tasks in the presence of predators and with limited energy reserves. In addition, a physical colony of four agents has been fabricated with the same architecture, to ensure that the behaviours observed in simulation were also present in the hardware implementations.     

土坯砌体单轴受压本构模型研究

通过土体材料的土工试验及泥浆立方体、土坯和土坯砌体单轴抗压试验,分析了土体材料的工程性质和单轴受压下土坯砌体的应力-应变关系。建立了泥浆立方体、土坯和土坯砌体的弹性模量与其抗压强度之间的关系方程,提出了土坯砌体抗压强度的简化计算公式。基于Weibull分布的损伤统计强度理论,利用应力-应变曲线峰值点的特征,建立了损伤修正统计本构模型,并与试验数据进行了比较,验证了损伤修正统计本构模型。研究表明:土坯砌体损伤统计本构模型,在峰值应力前期,损伤修正统计本构模型与试验数据吻合很好;在峰值应力后期,由损伤修正统计本构模型计算的应力值比土坯砌体试验应力值偏小。研究结果可为土坯砌体墙的抗震性能研究提供理论参考。     

Identification of biological systems: a survey

This paper presents a survey of applications of system and parameter identification methods to biological systems, including cardiovascular, respiratory, neural, renal, metabolic, skeletal and other systems. Some recent work on identification of parameters in human operator models is also included. The references are grouped by field of application.