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中央空调用水的处理技术 总被引:3,自引:0,他引:3
中央空调是一种高精密度、价格昂贵的设备,结垢及腐蚀是危害空调的"第一杀手".不仅会影响中央空调的制冷效率,而且会缩短设备的使用寿命,严重的会造成管线和设备腐蚀穿孔现象.因此,要定期检查中央空调机组及循环水系统,若有污垢产生,应及时进行清洗.此外,制定适当的水处理方案是维持系统正常运行的关键. 相似文献
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Cooperative spectrum sensing in cognitive radio is investigated to improve the detection performance of Primary User(PU).Meanwhile,cluster-based hierarchical cooperation is introduced for reducing the overhead as well as maintaining a certain level of sensing performance.However,in existing hierarchically cooperative spectrum sensing algorithms,the robustness problem of the system is seldom considered.In this paper,we propose a reputation-based hierarchically cooperative spectrum sensing scheme in Cognitive Radio Networks(CRNs).Before spectrum sensing,clusters are grouped based on the location correlation coefficients of Secondary Users(SUs).In the proposed scheme,there are two levels of cooperation,the first one is perfonned within a cluster and the second one is carried out among clusters.With the reputation mechanism and modified MAJORITY rule in the second level cooperation,the proposed scheme can not only relieve the influence of the shadowing,but also eliminate the impact of the PU emulation attack on a relatively large scale.Simulation results show that,in the scenarios with deep-shadowing or multiple attacked SUs,our proposed scheme achieves a better tradeoff between the system robustness and the energy saving compared with those conventionally cooperative sensing schemes. 相似文献
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随机动态规划(SDP)方法是水库优化调度的基本方法,但将其应用于包含有多年调节水库的水库群的优化调度时会引起"维数灾"问题,并且难以反映多年调节水库调节周期不定的特点。针对这种情况,本文提出多层次的改进遗传模拟退火优化算法(IGA-SA),把库群优化问题分解为第1层次的SDP优化与第2层次的IGA-SA优化,从而获得库群的优化调度结果,并应用于贵州乌江梯级水库群中长期发电优化调度研究中,取得较好的结果。实践表明,该方法可以克服随机动态规划应用中遇到的"维数灾"问题,并给包含有多年调节水库的水库群的优化调度问题研究提供了有效的工具。 相似文献
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中央空调是一种高精密度、价格昂贵的设备、结垢及腐蚀是危害空调的“第一杀手”,不仅会影响中央空调的制冷效率,而且会缩短设备的使用寿命,严重的会造成管线和设备腐蚀穿孔现象。因此,要定期检查中央空调机组及循环水系统,若有污垢产生,应及时进行清洗。此外,制定适当的水处理方案是维持系统正常运行的关键。 相似文献
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