新锐地产空间形态比较分析

分别介绍了新锐地产兴起的原因及其概念内涵,外延等内容,并通过对不同地域环境中新锐地产空间形态特征与文化语义研究分析,总结出了新锐地产的空间美学意义与社会价值,对传统建筑保护更新工作具有指导意义。     

浅析中国国家博物馆与首都博物馆的设计特点

通过比较分析中国国家博物馆与首都博物馆设计特点,从历史文化、空间形态、传统与现代科技结合等几个方面探讨大型博物馆的创新设计理念和设计方法。     

矿用永磁耦合联轴器过载保护实验研究

 摘要：本文利用Ansoft maxwell有限元模拟分析及实验，研究应用于煤矿井下的磁力耦合联轴器的过载保护问题，并通过实验数据绘制出机械特性曲线。从机械特性曲线可以看出：输出扭矩值在达到磁力耦合器的最大转矩后，随着转差增大，输出转矩、转速降低，电动机的输入功率小于电动机在最大转矩时的功率，说明此磁力耦合联轴器具备过载保护性能。     

The global avalanche characteristics of two Boolean functions and algebraic immunity

The global avalanche characteristics criterion of two Boolean functions was introduced by Zhou et al. [On the global avalanche characteristics criterion of two Boolean functions and the higher order nonlinearity, Inform. Sci. 180(2) (2010), pp. 256–265] to measure the cryptographic behaviour in a global characteristic. The two indicators σ _{f, g} and Δ _{f, g} of Boolean functions f and g were presented. In this paper, a new upper bound on σ _{f, g} is derived, and a technique on constructing Boolean functions to attain the lower bound on the sum-of-squares indicator is described by using the disjoint spectra method. Some new upper bounds on Δ _{f, g} and σ _{f, g} are deduced for two special Boolean functions. Two relationships between σ _{f, g} and algebraic immunity of the two Boolean functions are obtained. Finally, some links among different cryptographic indicators are shown.     

An fully-automated measurement system for identifying magnetization characteristics of switched reluctance motors

Precise understanding of knowledge and behavior of the SRM is needed for the development and verification of advanced control algorithm. An fully-automated measurement system is proposed in this paper to identify the magnetization characteristics of the SRM as functions of the winding current and rotor position. The proposed system can characterize the SRM automatically and take magnetic nonlinearity and static iron losses into account. The post-mortem data processing with a graphical user interface constitutes the measuring procedures and provides easy manipulation and clear presentation of the results. The theoretical sensitivity is derived; error sources and uncertainties of the measurement are also analyzed and discussed. Experimental results with good accuracy conducted on a four-phase SRM show the correctness and practicability of the presented system. Special emphasis is oriented on the suitability for the production line application to on-line determine the saturation behaviors of the SRMs.     

Analysis of deep excavations in clay under the undrained and plane strain condition with small strain characteristics

The nonlinearity and small strain characteristics of clay are predominant factors to affect the analysis accuracy of surface settlement induced by deep excavation in soft clay. In this study, we use a newly developed constitutive model, namely the undrained soft clay model, to simulate the nonlinearity of soft clay and to describe the degradation of elastic Young's modulus with the increasing stress level, ranging from small strain to near failure. The parameters of the formula can be obtained from conventional soil tests. One well-documented case history is then used to show the parameter determination procedure and validate the proposed model. The states of strain and stress paths for the soil in the excavation are also studied to validate the rationality of the model. Besides, two additional case studies are conducted to verify the model further.     

机械结合面动态特性影响因素的研究

基于模态实验分析和有限元分析相结合的方法对固定结合面动态特性参数进行识别。对大量的实验数据进行分析,得出固定结合面在不同粗糙度、有无介质、不同材料及不同螺栓排布方式等不同因素影响下,动态特性参数的变化规律。为进一步的机械系统动力学仿真及其动态优化设计提供了参考依据。在总结实验结果的基础上,提出了结合面改进措施,为结合面的模态分析及优化设计提供了真实有效的数据。     

Biological characteristics of [~(18)F]-THK523 for tau imaging

Reliable and non-invasive diagnostic tools are highly valuable for successful therapeutic strategies for the treatment of Alzheimer's disease(AD). The existence of neurofibrillary tangles(NFTs) consisting of tau protein are one kind of the pathological features of AD, and its level of severity is correlated with the stage of AD.However, no clinically approved positron emission tomography(PET) probe is currently available for selective imaging of neurofibrillary tangles on patients. In this paper, we report our studies on biological characteristics of [18F]-THK523 as a novel tau imaging probe. With low molecular weight, [18F]-THK523 is stable, electrically neutral, lipophilic and non-mass concentration-dependent. Preliminary biological studies have shown the excellent properties of [18F]-THK523 as brain imaging tracer for further research.