985 resultados para Gigli, Girolamo, 1660-1722.
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This paper proposed a novel control scheme for operating the Single Phase Brushless Doubly-Fed Machine (SPB) based on Stator-Flux-Oriented control algorithm. The SPB is a new type of Brushless Doubly-Fed Machine (BDFM) which shows a potential in applications which require adjustable speed such as Wind Power generation and speed adjustable Drive. The SPB can be applied to single-phase power system and the lower cost of the SPB makes the SPB suitable for low-rated power conversion applications. This paper develops the control scheme of the SPB with explicit mathematical analysis and block diagram of the controller. Experimental verification is also given. © 2011 IEEE.
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借助细胞培养和电镜技术,揭示了鳜球形病毒(Siniperca chuatsi spherical virus,SCSV)与鳜弹状病毒(Siniperca chuatsi rhabdovirus,SCRV)在草鱼鳍细胞(Grass carp fins,GCF)中共感染的现象。在筛选到敏感鱼类细胞系和建立了 鳜病毒体外增殖系统的基础上,取息典型病毒感染出血症的鳜组织,制备组织悬液,接种到GCF细胞中传代培养, 在攻毒后间隔不同时间收集细胞,对攻毒细胞的超薄切片进行电镜观察。揭示两种形态的鳜病毒可在同一个GCF
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根据噶氏斑纹和雄性个体的副性征,对我国的鳅属鱼类进行了分类整理。一直被作为中华鳅Cobitissinensis Sauvageet Dabry,1874同物异名的长吻鳅C.dolichor hynchus Nichols,1918和稀有鳅C.rarusChen,1981不仅在噶氏斑纹上存在差异,而且它们雄性个体的副性征也明显有别,为有效种;而1925年Nichols命名的花斑鳅C.melanoleuca Nichols,1925与北方鳅C.granoeiRendahl,1935或中华鳅不同,也为有效种。因
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A model gas turbine burner was employed to investigate spray flames established under globally lean, continuous, swirling conditions. Two types of fuel were used to generate liquid spray flames: palm biodiesel and Jet-A1. The main swirling air flow was preheated to 350°C prior to mixing with airblast-atomized fuel droplets at atmospheric pressure. The global flame structure of flame and flow field were investigated at the fixed power output of 6 kW. Flame chemiluminescence imaging technique was employed to investigate the flame reaction zones, while particle imaging velocimetry (PIV) was utilized to measure the flow field within the combustor. The flow fields of both flames are almost identical despite some differences in the flame reaction zones. © (2013) Trans Tech Publications, Switzerland.
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This paper studies the excitability properties of a generalized FitzHugh-Nagumo model. The model differs from the classical FitzHugh-Nagumo model in that it accounts for the effect of cooperative gating variables such as activation of calcium currents. Excitability is explored by unfolding a pitchfork bifurcation that is shown to organize five different types of excitability. In addition to the three classical types of neuronal excitability, two novel types are described and distinctly associated to the presence of cooperative variables. © 2012 Society for Industrial and Applied Mathematics.
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A 3(rd) order complex band-pass filter (BPF) with auto-tuning architecture is proposed in this paper. It is implemented in 0.18 mu m standard CMOS technology. The complex filter is centered at 4.092MHz with bandwidth of 2.4MHz. The in-band 3(rd) order harmonic input intercept point (IIP3) is larger than 19dBm, with 50 Omega as the source impedance. The input referred noise is about 80 mu V-rms. The RC tuning is based on Binary Search Algorithm (BSA) with tuning accuracy of 3%. The chip area of the tuning system is 0.28x0.22mm(2), less than 1/8 of that of the main-filter which is 0.92x0.59mm(2). After tuning is completed, the tuning system will be turned off automatically to save power and to avoid interference. The complex filter consumes 2.6mA with a 1.8V power supply.
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提出了一个基于存储层次的新并行计算模型DRAM(h),并在该模型下对两个经典并行数值计算算法的不同实现形式:四种形式并行了三角方程求解(PTRS)和六种形式无列选主元并行LU分解(PLU),进行了分析。模型分析表明,具有近乎相同时间和空间复杂性的同一算法不同实现形式在该模型下会有完全不同的存储复杂度。作者在日立公司SR2201 MPP并行机、曙光3000超级服务器和中国科学院科学与工程计算国家重点实验室(LSEC)的128节点Linux Cluster等三种并行计算平台上对模型分析结果进行了实验验证。结果表明,该模型分析在绝大数情况下都能较好地与不同实验枰台上的实验结果吻合。个别出现偏差的分析结果,在根据计算平台的存储层次特点修改模型分析的假定后,也能够进行解释。这说明了该模型以不同形式的算法实现进行存储访问模式区分的有效性。对在计算模型中加入指令/线程级并行的可行性和方法的研究是下一步的工作。
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动态多层Web系统在运行时会受到许多不确定性因素的影响.同时,在不同的负载模式下具有不同的性能特性,需要不同的性能模型进行描述.为消除不确定性因素对系统性能的影响,基于反馈控制原理设计的性能保障机制主要采用单一、固定的系统性能模型,对动态Web系统变化的性能特征考虑不够.在负载呈波动且具有不可预测特性的Internet环境中,这会降低性能目标的精确性和稳定性.采用自适应控制的思想,以满足请求平均响应时间为目标,提出了一种基于在线评估系统性能模型的保障机制,并采用两个不同类型的事务性Web测试基准,对所提方法进行了评价.结果表明,该方法能够有效减轻变化负载模式下响应时间与预期目标的偏离程度.
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为提高印染污水处理效果,以羧甲基壳聚糖和硝酸镧为絮凝剂,研究了羧甲基壳
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Infrared absorption experiments have been performed on hydrogenated and deuterated bulk boron- and aluminum-doped-Si and implanted P, As, and Sb donors in silicon. A first evidence of complex formation in bulk p-type Si is obtained and the spectra confirm the anomalous 3.3-cm-1 deuterium frequency shift with respect to boron isotopes. The ratio of the D-B-11 and D-B-10 peak areas is found to be the same as that of the two boron isotopes natural abundance. In donor-implanted silicon, a quantitative analysis of the obtained data has allowed a rough estimate of the passivating rate due to diffusing deuterium. While the frequencies of the various vibrational lines are found to be in agreement with those reported in the literature, the data on the broad line at 1660 cm-1 (H) or 1220 cm-1 (D) seem to suggest an assignment of this peak to a complex in the bulk involving some type of defect due to the implantation process.
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This paper presents an SG-DBR with a monolithically integrated SOA fabricated using quantum-well intermixing (QWI) for the first time in mainland China. The wavelength tuning range covers 33nm and the output power reaches 10mW with an SOA current of 50mA. The device can work at available channels with SMSR over 35dB.