Multisim仿真软件在发动机电控设计中的应用

概述了Multisim7．O仿真软件的功能与特点，并以发动机喷油器驱动电路设计为例，说明了软件的使用方法。利用Multisim7．O加速了硬件电路的开发进程，使用其功能齐全的仿真功能保证了电路的正确性。     

Blind Source Separation of Instantaneous Mixture of Delayed Sources Using High‐Order Taylor Approximation

This paper deals with the problem of blind source separation (BSS), where observed signals are a mixture of delayed sources. In reference to a previous work, when the delay time is small such that the first‐order Taylor approximation holds, delayed observations are transformed into an instantaneous mixture of original sources and their derivatives, for which an extended second‐order blind identification (SOBI) approach is used to recover sources. Inspired by the results of this previous work, we propose to generalize its first‐order Taylor approximation to suit higher‐order approximations in the case of a large delay time based on a similar version of its extended SOBI. Compared to SOBI and its extended version for a first‐order Taylor approximation, our method is more efficient in terms of separation quality when the delay time is large. Simulation results verify the performance of our approach under different time delays and signal‐to‐noise ratio conditions, respectively.     

Hole Transport Materials Based on 6,12‐Dihydroindeno[1,2‐b]fluorine with Different Periphery Groups: A New Strategy for Dopant‐Free Perovskite Solar Cells

Although several hole‐transporting materials (HTMs) have been designed to obtain perovskite solar cells (PSCs) devices with high performance, the dopant‐free HTMs for efficient and stable PSCs remain rare. Herein, a rigid planar 6,12‐dihydroindeno[1,2‐b]fluorine (IDF) core with different numbers of bulky periphery groups to construct dopant‐free HTMs of IDF‐SFXPh, IDF‐DiDPA, and IDF‐TeDPA is modified. Thanks to the contributions of the planar IDF core and the twisted SFX periphery groups, the dopant‐free IDF‐SFXPh‐based PSCs device achieves a device performance of 17.6%, comparable to the doped 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD)‐based device (17.6%), with much enhanced device stability under glovebox and ambient conditions.     

Rear‐Passivated Ultrathin Cu(In,Ga)Se2 Films by Al2O3 Nanostructures Using Glancing Angle Deposition Toward Photovoltaic Devices with Enhanced Efficiency

In this work, for the first time, the addition of aluminum oxide nanostructures (Al₂O₃ NSs) grown by glancing angle deposition (GLAD) is investigated on an ultrathin Cu(In,Ga)Se₂ device (400 nm) fabricated using a sequential process, i.e., post‐selenization of the metallic precursor layer. The most striking observation to emerge from this study is the alleviation of phase separation after adding the Al₂O₃ NSs with improved Se diffusion into the non‐uniformed metallic precursor due to the surface roughness resulting from the Al₂O₃ NSs. In addition, the raised Na concentration at the rear surface can be attributed to the increased diffusion of Na ion facilitated by Al₂O₃ NSs. The coverage and thickness of the Al₂O₃ NSs significantly affects the cell performance because of an increase in shunt resistance associated with the formation of Na₂Se_X and phase separation. The passivation effect attributed to the Al₂O₃ NSs is well studied using the bias‐EQE measurement and J–V characteristics under dark and illuminated conditions. With the optimization of the Al₂O₃ NSs, the remarkable enhancement in the cell performance occurs, exhibiting a power conversion efficiency increase from 2.83% to 5.33%, demonstrating a promising method for improving ultrathin Cu(In,Ga)Se₂ devices, and providing significant opportunities for further applications.     

光伏电站设计智能优化

由于目前光伏电站设计目前没有相应的标准,因此以个人经验为指导的情况,无法保证电站建设的成本最优,鉴于此问题,本文提出了一种光伏电站优化设计方法,基于模拟退火算法,通过对光伏区域中的组件进行最优分组来实现两级电缆成本的最优。并通过实际项目对该算法进行检验,达到比较理想效果。     

联合多分组接收和模糊逻辑控制功率策略

针对无线网络节约能耗的要求,提出了一种联合多分组接收和模糊逻辑控制功率策略,采用串行干扰消除法,根据无线节点的传输功率等级,将功率等级划分为多分组接收能够正常解码的功率等级,并以任一无线节点到邻接节点的距离、邻接节点的个数和无线节点的剩余能耗为模糊逻辑控制的输入参数来控制各无线节点的功率选择。仿真结果表明,与现有的几种经典的基于功率控制的串行干扰消除算法方案相比,联合多分组接收和模糊逻辑控制功率策略的无线网络具有更大的有效吞吐量及更长的生存时间。     

数据中心环境要求发展动态

介绍了ASHRAE关于数据中心环境要求的变更过程,分析了数据中心温湿度对IT设备的性能和效率的影响,以及机房环境条件对节能的影响。建议数据中心设计者和建造者应根据IT业务的重要程度、IT设备形式、节能目标等多种因素综合考虑,选择合适的空调形式和环境温湿度设置点。     

一种基于道路约束的变结构多模型跟踪算法

有效使用道路信息能显著提高地面运动目标跟踪性能。针对复杂道路网运动目标跟踪,给出了一种道路约束下的滤波和建模方法。首先描述了道路网的数学模型和道路约束条件下的过程噪声修正方法,根据道路约束最大后验概率估计准则给出了一种路段切换时状态和协方差修正公式;接着提出一种根据目标当前所处路段自适应滤波模型生成的变结构多模型(VSMM)方法,有效减小道路运动目标的模型动态误差,提高跟踪性能。仿真结果证明了该算法的优越性能。     

基于以太网络的宇航用高清摄像机的硬件设计

由于目前现有工业用摄像机无法满足空间大温度范围、强振动环境等要求,提出了能够适应空间环境的基于以太网络视频传输的高清一体摄像机.该摄像机在完成包括H.264,JPEG2000,MPEG4等图像编码算法的同时,支持空间以太网络协议进行传输和控制.针对宇航环境使用要求,从结构设计、力学设计、热设计、电磁兼容设计等方面进行可靠性设计和仿真验证,满足质量轻、温度适应性好、可靠性高等要求.经过鉴定试验验证,所设计的高清一体摄像机可以可靠地在空间严苛环境中工作.     

Using nano-scale QCA technology for designing fault-tolerant 2:1 multiplexer

Recently, Quantum-dot Cellular Automata (QCA) has appeared as a noteworthy substitution to CMOS technology. It contains ultra-high-velocity, efficient energy, low area for design circuits, one potential computational fabric for Nano computing systems, and integration density. On the other hand, fault-tolerant circuits promise reliability circuits by computation redundancy cells. This work targets to form two designs of fault-tolerant 2:1 multiplexer in the QCA framework. This proposed QCA multiplexer designs use cell redundancy on the wire, NOT gates, and majority gates. The coplanar structures for the proposed 2:1 QCA fault-tolerant multiplexers are provided and operated based on cell interactions. Four types of faults, cell misalignment, cell missing, cell displacement, and extra cell, are essential in analyzing the fault attributes. The proposed fault-tolerant multiplexers can attain 100% fault-tolerance while extra cell deficiencies or single missing exist in the layout of the QCA. The simulation outcomes reached by the software, QCA Designer 2.0.3, approve that the suggested multiplexers work correctly and can be utilized in QCA technology as a high-performance schematization. The outcomes show that the proposed construct outperforms any prior schematization.