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为了提高南二一深度污水站反冲洗效率,改善水质,我站探索实施了自动化反冲洗操作方法。该方法使污水水质指标得到改善的同时,实现了节能降耗、挖潜增效的目标。 相似文献
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Stefan Strasser 《流程工业》2008,(11):42-44
RWF反冲洗过滤器具有极佳的反冲洗效果,它不仅提高了用户的经济效益(节约了流体介质的输送费用,节省了流程泵的能源消耗),而且也开创了反冲洗过滤技术全新的应用领域,可以替代费时费力而且费用昂贵的流程工艺技术,例如竖流式沉淀絮凝、沉积式过滤和横流过滤等。 相似文献
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本文从理论及工程实践角度探讨普通快滤池改造中影响滤池反冲配水均匀性的一些因素。文章中指出具有中间配水渠结构的普通快滤池,做小阻力改造后中间配水渠不同位置由于存在压力差而对滤池反冲洗配水均匀性造成的影响,以及如何避免和减小中间配水渠的配水不均均性。 相似文献
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介绍了一种测量平面度误差的二维最小二乘逐次两点设基分离法,设计了一套自动测量实验系统,并且编制了一套满足最小条件的平面度误差数据处理程序。 相似文献
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一种在线识别转子不平衡量的新方法 总被引:1,自引:0,他引:1
本文采用电磁激励的方法,在线识别转子支承的刚度和阻尼系数,然后根据Ritz法和模态理论的基本思想,提出了一种新的转子不平衡的识别方法,该方法无需改变转子的工作转速,且能在支承随转速变化的条件下,满足全速动平衡的要求,该方法适用于测点数和校正平面数都大于等于3的转子,文中给出了仿真研究结果证明了该方法的有效性。 相似文献
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本文介绍了基于离散哈脱莱变换与离散付里叶变换关系,计算非周期信号的频谱的方法。该方法比利用离散付里叶变换大多数算法能减少运算量,提高运算速度。 相似文献
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螺杆泵井已成为油田生产主要举升方法之一,其应用规模在逐步地扩大,为更好的提高螺杆泵井地管理水平,本文结合了生产中的实际情况,以分析螺杆泵井的工作电流、螺杆泵井的消耗功率及其输出扭矩为着手点,探索这几点因素与螺杆泵井结蜡地量化关系,从而分析应运用何种方法才能科学合理地确定其热洗周期。 相似文献
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超滤在天然甘露醇精制中的应用 总被引:4,自引:1,他引:3
在天然甘露醇的生产中 ,应用中空纤维超滤技术改进传统的精制工艺 ,去除糖胶、颗粒等杂质 .纯化后的产品可改善大输液的生产工艺 ,满足出口产品的要求 .近两年的实际应用表明 ,该新技术的开发和应用是成功的 . 相似文献
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The sustainable development of Internet hospitals and e-health platforms relies on the participation of patients and physicians, especially on the provision of health counseling services by physicians. The objective of our study is to explore the factors motivating Chinese physicians to provide online health counseling services from the perspectives of their online and offline reputation. We collect the data of 141029 physicians from 6173 offline hospitals located in 350 cities in China. Based on the reputation theory and previous studies, we incorporate patients’ feedback as physicians’ online reputation and incorporate physicians’ offline professional status as physicians’ offline reputation. Results show that physicians’ online reputation significantly and positively influence their online counseling behaviors, whereas physicians’ offline reputation significantly and negatively influence their online counseling behaviors. We conclude that physician’s online and offline reputations show a competitive and substitute relationship rather than a complementary relationship in influencing physicians to provide online counseling services in Internet hospitals. One possible explanation for the substitute relationship could be the constraints of limited time and effort of physicians. 相似文献
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Mehdi Ghazanfari Adel Alaeddini Seyed Taghi Akhavan Niaki Mir‐Bahador Aryanezhad 《Quality and Reliability Engineering International》2008,24(7):765-778
Control charts are the most popular statistical process control tools used to monitor process changes. When a control chart indicates an out‐of‐control signal it means that the process has changed. However, control chart signals do not indicate the real time of process changes, which is essential for identifying and removing assignable causes and ultimately improving the process. Identifying the real time of the change is known as the change‐point estimation problem. Most of the traditional methods of estimating the process change point are developed based on the assumption that the process follows a normal distribution with known parameters, which is seldom true. In this paper, we propose clustering techniques to estimate Shewhart control chart change points. The proposed approach does not depend on the true values of the parameters and even the distribution of the process variables. Accordingly, it is applicable to both phase‐I and phase‐II of normal and non‐normal processes. At the end, we discuss the performance of the proposed method in comparison with the traditional procedures through extensive simulation studies. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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A. Hofmann 《低温学》2006,46(11):825-830
It is a normal operating condition for a lot of cryogenic storage vessels that no boil-off gas is vented over long periods, which leads to a simultaneous pressure increase of the stored fluid. One main reason therefore is to avoid product losses during transport or between withdrawals. At transport conditions the mixing of the fluid can be assumed to be ideally, which results in a maximum reachable pressurising period. At stationary conditions the pressurising period is expected to be shorter, because a stratification is rising up, so that the heat capacity of the stored fluid cannot be used completely.In a thermodynamic view, an isochore change of state takes place and the heat flux into the vessel rises the internal energy of the fluid. For the representation of the isochore change of state a new developed Δu/v-v-diagram with the 1 × 105 Pa reference as a basis line is introduced. The basis line is linear for the filling rate and functionally connected with the specific volume.For the fluids He and H2 e.g., Δu/v-v-diagrams are pointed out, using the u- and v-values on the saturation lines for the two phase region and those of some isobar lines for the region above the critical pressure. 相似文献