共查询到19条相似文献,搜索用时 78 毫秒
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本文应用模糊数学相关理论,结合教学质量综合评估指标体系,利用层次分析方法,建立了一种能够对教学质量进行有效定量评估的新系统——教学质量模糊评价系统。 相似文献
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固体热容激光器连续运转一段时间后,需要进行冷却,以进行下一次运转,因此冷却速度直接影响着热容激光器运转的效率和实用性。从热传导方程出发,以沉积热为内热源模型,利用有限元分析方法对激光二极管阵列从4个方向对称泵浦的板条Nd:GGG激光介质的温度场和和热应力场进行了数值模拟。并对冷却阶段分别采用过冷气体、水循环、喷雾、相变冷却方式时的介质温度和应力随时间变化过程进行了模拟。结果表明在相同条件下采用相变冷却方式能在较短时间内将介质冷却到初始温度。 相似文献
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压缩空气蓄能电站综合效益评价研究 总被引:1,自引:0,他引:1
压缩空气蓄能(CAES)电站是一种新型电能存储系统,具有动态响应快、经济性能高、环境污染小等优点,可起到负荷平衡、战略规划、提高供电质量的作用.其经济效益的来源可分为两部分,静态效益和动态效益.本文将通过容量效益、能量转换效益、环保效益和动态效益等进行综合性量化评价研究. 相似文献
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研究由辐射压力与驱动Fabry-Perot光学腔相耦合而产生的腔光机械动力学行为. 通过量子朗之万方程具体研究了机械振子的涨落光谱、机械阻尼与共振频移和基态冷却. 随着输入激光功率的增加,振子的涨落光谱呈现简正模式分裂的现象,并且数值模拟结果和实验结果相符合. 同时推导了有效机械阻尼和共振频移. 红移边带导致了机械模的冷却,蓝移边带引起了机械模的放大. 此外,引入一种近似机制来研究振子的基态冷却,并且考虑在解析边带机制下简正模式分裂对机械振子冷却的影响. 最后,数值讨论了初始浴温度、输入激光功率和机械品质因数这三个因素对机械振子冷却的影响.
关键词:
腔光机械
辐射压力
简正模式分裂
冷却 相似文献
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Normal mode splitting and ground state cooling in a Fabry-Perot optical cavity and transmission line resonator 下载免费PDF全文
Optomechanical dynamics in two systems which are a transmission line resonator and Fabrya-Perot optical cavity via radiation-pressure are investigated by linearized quantum Langevin equation. We work in the resolved sideband regime where the oscillator resonance frequency exceeds the cavity linewidth. Normal mode splittings of the mechanical resonator as a pure result of the coupling interaction in the two optomechanical systems is studied, and we make a comparison of normal mode splitting of mechanical resonator between the two systems. In the optical cavity, the normal mode splitting of the movable mirror approaches the latest experiment very well. In addition, an approximation scheme is introduced to demonstrate the ground state cooling, and we make a comparison of cooling between the two systems dominated by two key factors, which are the initial bath temperature and the mechanical quality factor. Since both the normal mode splitting and cooling require working in the resolved sideband regime, whether the normal mode splitting influences the cooling of the mirror is considered. Considering the size of the mechanical resonator and precooling the system, the mechanical resonator in the transmission line resonator system is easier to achieve the ground state cooling than in optical cavity. 相似文献
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城市公园声景观危险度评价研究 总被引:4,自引:3,他引:1
针对城市公园声景观易受周围环境影响而损耗其景观价值这一问题,应用模糊层次分析法,通过自然、生活和机械3个准则层因素和17个指标层因素构建城市公园声景观危险度评价体系,以福州市闽江公园为例,研究城市公园声景观受负面影响因子损耗的可能性大小。结果表明,闽江公园声景观危险度总体评价结果为中度危险Ⅲ。指标层中,隶属极度危险Ⅴ的指标为修建施工声;隶属重度危险Ⅳ的为电闪雷鸣声;隶属中度危险Ⅲ的有:清洁机器声、大雨瓢泼声、车辆交通声、说话嬉戏声、狂风呼啸声、猫叫犬吠声、鞭炮烟花声、跳舞音响声和练嗓唱歌声;其余指标危险度均低于中度危险Ⅲ。评价结果符合实际,为今后城市公园声景观危险度研究提供了有效方法。 相似文献
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为了对一维掺杂声子晶体的缺陷模进行解析研究,利用多波束干涉原理和布洛赫定理,推导出一维掺杂声子晶体的缺陷模频率的解析公式.利用它对一维掺杂声子晶体的缺陷模进行了解析研究,得到了缺陷模频率的变化规律.该方法克服了其他方法不能对缺陷模进行解析研究的不足,是一种研究一维掺杂声子晶体的缺陷模的精确、有效方法.
关键词:
声子晶体
声波
缺陷模
解析方法 相似文献
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将模糊层次分析法(FAHP)应用于项目的选择中来,根据相关因素对项目的重要程度进行排序,改变了靠决策者主观选择项目这一现状,使项目的决择更科学. 相似文献
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In order to deal with the new threat of low altitude slow small (LSS) targets in air defense operations and provide support for LSS target interception decision, we propose a simple and reliable LSS target threat assessment method. Based on the detection capability of LSS targets and their threat characteristics, this paper proposes a threat evaluation factor and threat degree quantization function in line with the characteristics of LSS targets. LSS targets not only have the same threat characteristics as traditional air targets but also have the unique characteristics of flexible mobility and dynamic mission planning. Therefore, we use analytic hierarchy process (AHP) and information entropy to determine the subjective and objective threat factor weights of LSS targets and use the optimization model to combine them to obtain more reliable evaluation weights. Finally, the effectiveness and credibility of the proposed method are verified by experimental simulation. 相似文献