Effect of cooling rate on dynamic magnetization of Fe86Zr7B6Cu nanocrystalline alloy

The complex permeability spectra in Fe₈₆Zr₇B₆Cu nanocrystalline alloy are studied by varying ac field amplitude and the cooling rate after annealing. It is shown that the initial permeability and the relaxation frequency strongly depend on the extent of domain wall pining. Slow cooling may result in the nucleation of the short-range atomic ordering in domain walls, whereas fast cooling may induce internal stress. Both the too slow cooling and the too fast cooling would make the additional pinning sites form in domain walls, which may strengthen the domain wall pining and make the permeability decrease and the relaxation frequency increase. The control of cooling rate is one of most important factors to improve the soft magnetic properties of Fe₈₆Zr₇B₆Cu nanocrystalline alloy.     

网格状网络的设计探讨

网格状网络正日益成为核心传送网首选的建网方式。着重介绍了网格状网络的特点和优势，构建网格状网络需考虑的因素及步骤。     

中国徽州地区农村传统村落街区空间构造的形成——对古徽州地区呈坎村与卢村的调查

街区是构成中国传统村落的基本组团单位，其潜在的含义是居住者的社会组成。本文从社会构成的角度分析街区所反映出来的村落空间形式。     

对煤炭营销中信息的认识及建议

随着社会经济的快速发展,企业为应对市场的挑战,在激烈的市场竞争中求得生存与发展,掌握及时的、灵通的市场信息,显得极为重要.     

Performance analysis of two‐way MAC layer network coding under finite relay buffer and non‐negligible signalling overhead

Two‐way exclusive OR (XOR) relay can enable hidden nodes to exchange data with low delays and high data rate, while keeping signal processing simple. In this paper, we analyse practical two‐way XOR relaying systems, where finite relay buffer, non‐negligible signalling overhead, and lossy wireless channels are all captured. A two‐layer model is developed to characterise such practical two‐way relay systems, which is then reformulated into a Markov process after we project and combine inter‐layer state transitions of the two‐layer model. Using Markov techniques, we evaluate the steady state probabilities of the Markov process and, in turn, the key performance measures of two‐way XOR relaying, such as throughput, delay, and packet loss. The accuracy of our model is validated by simulations. Our model can also be used as an online tool to configure the buffer resources, adapting to wireless channel conditions and signalling requirements. Copyright © 2016 John Wiley & Sons, Ltd.     

On the Effect of Exposed Timber on the Severity of Structural Fires in a Compartment and Required Firefighting Resources

Fire Technology - Estimation of design fires and thermal exposure conditions is an important step in structural fire engineering procedures. Mass timber, as a combustible material, may contribute...     

基于COBRA的角接触球轴承仿真分析

借助COBRA软件对某角接触球轴承的游隙和结构参数进行了仿真分析,大大减少轴承的接触应力和滚道磨损发热量,缩短了设计周期,提高了生产效率。