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A novel strip-coil-baffle structure used to enhance heat transfer and support the tube bundle for a tube-shell heat exchanger is proposed.The new structure can sleeve the tubes in bundle alternatively to create a vortex flow in a heat exchanger.The numeri
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介绍了一种用于强化管壳式换热器壳侧传热和支撑管束的螺旋折流片新型结构,该结构是对换热器管子相间地套上螺旋折流片以产生旋涡流动.研究模型是在正方形布置的4个管子中的2个对角管子套上螺旋折流片后形成的通道,利用FLUENT软件对该上述四管通道模型的流场和温度分布情况进行了数值模拟;分析了四管通道模型中螺旋折流片对强化传热和流动阻力随雷诺数的变化关系的影响.算例结果显示该新型结构可比相同尺寸的光管通道中的情形传热系数提高约40﹪～55﹪,同时也将伴随较高的流动阻力.可以相信螺旋折流片式换热器将会在许多工业领域有 |
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A novel technique has been developed to diagnose the operating faults of the dry screw vacuum pump by monitoring the vibration and by analyzing spectrum of vibration frequency and the time domain waveform.
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摘要针对干式螺杆真空泵的运行故障，采用振动监测的方法，利用时域波形和频谱分析技术进行故障诊断。 |
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A novel three-level AC chopper is proposed, which is a new multi-level converter applied to high voltage conversion, and utilizes more electric levels to form output voltage and decrease the harmonic content of output waveform.
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摘要提出一种用于高压电能变换的新型三电平交流斩波电路，该电路允许使用低电压等级的器件完成高压电能变换，并采用较多的电平数去逼近所希望的波形，使输出电压或电流的质量大大提高，谐波含量减少。 |
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A novel two-phase genetic-annealing algorithm is proposed to solve the vehicle routing problem with time window (MDVRPTW) and multi-constraint in multiple dispatching centers.
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摘要针对多约束条件的多配送中心有时间窗车辆路径问题，提出了一种二阶段遗传退火算法。 |
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A novel type of magnetic material molecular alloys is described.Such molecular-base materials exhibit many interesting magnetic properties such as photoinduced magnetic pole inversion and transparent colorful magnetic films.
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文章介绍一种新型“分子合金”类磁性材料.通过调控铁磁-亚铁磁混合分子比例得到的这种新型分子基材料呈现了许多有趣的和有重大应用前景的磁性质，如光诱导磁极翻转现象等. |
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A novel virtual metrological verification system of missile aiming equipment based on PXI bus and Virtual instrument is designed and implemented.
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基于PXI总线和虚拟仪器的设计思想,设计并实现了一种新型的导弹瞄准电子设备虚拟计量检定系统。 |
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A novel vocal segments detection approach for singer identification is proposed.
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提出了一种新的语音检测算法。 |
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A novel, simple and cost effective assay for monitoring blood levels of rapamycin (sirolimus) and rapamycin analogues was developed.
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我们开发了一项用于检测血液中雷帕霉素（西罗莫司）和雷帕霉素类似物浓度的简便、经济节省的新型分析方法。 |
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A novelist creates characters and a plot.
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小说家塑造人物并设计作品的情节. |
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A novelist must be able to use the cultural heritage of his nation.
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小说家要善于利用他本国的文化遗产。 |
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A novelty of the test is to link collective decision with relative factor scarcities.
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这一检验的新颖之处在于，它将集体决策与要素的相对稀缺性相联系。 |
