Study of hybrid optical burst networks

We propose the hybrid optical burst switching (HOBS), and investigate the HOBS-based ring topology with numerical simulation. Results indicate that the packet loss ratio in HOBS is much less than that in optical burst switching(OBS) and its performance depends on some parameters such as the packet proportion, the electronic buffer size and the processing speed in the node. __________ Translated from Journal on Communications, 2005, 26(11): 7–11 (in Chinese)     

提高变压器抗短路强度的措施

变压器对抗短路强度的要求是很高的。文中介绍了变压器短路时的电动力的作用情况，结合单位实际情况介绍了提高变压器抗短路能力的措施。     

Influence of grain boundaries on short crack growth behaviour of IGSCC

Understanding short crack behaviour is essential for predicting the lifetime of light water reactor components. However, crack growth rates of short cracks are unsteady due to microstructural obstacles such as grain boundaries. On the other hand, the statistical behaviour of short cracks can be deduced from crack size distributions. Some papers have pointed out that the crack size distributions obtained by stress corrosion cracking tests showed a kink in the distribution line. This kink suggests that the short crack growth rate is slow compared with that of long cracks. And it can be thought that the slow growth rate is caused by the microstructural obstacles. This study investigated the influence of grain boundaries on the short crack growth behaviour of intergranular stress corrosion cracking. A crack growth simulation model, which considered the mechanical effects of the crack kink and bifurcation by grain boundaries, was developed. The crack depth distribution obtained by the simulation also exhibited a kink in the distribution line as seen in the experimental results. This suggests that grain boundaries play an important role in short crack growth behaviour.     

基于PRONY模型的谐波检测

信号的去噪问题一直是信号检测的一大难题,而要检测的信号往往却存在不同的随机噪声。在分析周期信号的基础上,提出了一种基于PRONY模型的周期信号分析法。经过对周期短(窄)脉冲信号的实验,这种直接构造的PRONY算法在周期信号中能达到有效、准确的分析结果。     

循环流化床风室的压力脉动特性分析

针对直径为0.205m,高度为7m的冷态高密度循环流化床(CFB)试验台,在表观气速为6.3m/s的条件下,借助小波理论对不同循环流率、不同出口结构的压力脉动特性进行了分析。结果表明:不管是高密度条件下还是低密度条件下的压力脉动,均属于低频脉动,脉动幅度为0~12.5Hz;在相同的出口结构和同一表观气速下,随着循环流率的增加,风室的压力增加,压力脉动的幅度也增加;在同一表观气速和相同循环流率下,Г型突变出口结构的风室压力和压力脉动幅度的增长速率均比C型光滑出口结构的大。     

Truly Concomitant and Independently Expressed Short‐ and Long‐Term Plasticity in a Bi2O2Se‐Based Three‐Terminal Memristor

Concomitance of diverse synaptic plasticity across different timescales produces complex cognitive processes. To achieve comparable cognitive complexity in memristive neuromorphic systems, devices that are capable of emulating short‐term (STP) and long‐term plasticity (LTP) concomitantly are essential. In existing memristors, however, STP and LTP can only be induced selectively because of the inability to be decoupled using different loci and mechanisms. In this work, the first demonstration of truly concomitant STP and LTP is reported in a three‐terminal memristor that uses independent physical phenomena to represent each form of plasticity. The emerging layered material Bi₂O₂Se is used for memristors for the first time, opening up the prospects for ultrathin, high‐speed, and low‐power neuromorphic devices. The concerted action of STP and LTP allows full‐range modulation of the transient synaptic efficacy, from depression to facilitation, by stimulus frequency or intensity, providing a versatile device platform for neuromorphic function implementation. A heuristic recurrent neural circuitry model is developed to simulate the intricate “sleep–wake cycle autoregulation” process, in which the concomitance of STP and LTP is posited as a key factor in enabling this neural homeostasis. This work sheds new light on the development of generic memristor platforms for highly dynamic neuromorphic computing.     

近距离煤层联合开采技术的应用

葛店煤矿N31采区有两层可采煤层,距离很近,煤层中间岩层平均厚度为2.6 m。葛店煤矿采取了上下两层煤同时开采的方式,实现了安全回采,提高了煤炭回收率,带来显著的经济效益。     

基于Windows环境下数据包截获的设计与实现

主要介绍了基于以太网环境下数据包的截获的设计与实现。数据包截获的实现是防范网络黑客攻击的措施之一。无论是最新的数据包状态分析的防火墙技术,还是智能的分布式的入侵检测技术,均离不开有效的数据截获、数据分析,文章就是为具备智能型入侵检测防火墙的设计与实现而研制的。     

OPGW与ADSS在电力系统中的应用

介绍电力系统特种光缆OPGW(架空地线复合光缆)和APSS(全介质自承式光缆)的特点、结构对性能的影响,同时分析了两种光缆在应用中的差异,并介绍了两种光缆在应用中应注意的一些问题。     

微微网同频干扰对蓝牙数据传输的影响

建立了蓝牙微微网相互之间干扰的数学模型，根据此模型推导了蓝牙数据分组重传概率与微微网个数之间的关系表达式；编程实现了对跳频算法的模拟，得到了碰撞概率与微微网个数的关系曲线．最后得到的实测结果与仿真结果吻合很好．