液烃干燥器改造分析

通过对现有液烃干燥器排液,泄压操作运行状态研究分析,提出可行改造方案,优化液烃干燥器排放,泄压操作,达到液烃干燥器长周期运行,丙烯产品水含量合格,降低生产运行成本,节省能耗。     

基于似然同步方法的非线性脑电信号分析方法

头皮脑电信号具有非平稳特性,相干等传统分析方法并不能很好地检测这些脑电时间序列间的依赖关系。广义同步中的似然同步算法对非平稳信号处理具有较好的效果,该文将它应用到实际脑电信号分析中。基于单向耦合Henon映射系统和实际脑电数据的仿真结果均表明,基于广义同步的似然同步方法适用测量非平稳信号间关系。针对健康被试静息态下,从闭眼到睁眼的过程中脑电信号间同步性的变化进行了研究,发现从闭眼到睁眼过程中,大脑的alpha波在几乎所有电极间的同步强度都显著地减弱,大脑的活动受到一定的抑制。上述结果也表明该方法在脑电数据分析中具有重要的意义,为其他的脑电研究提供一定的参考方法。     

Suspension force control of bearingless permanent magnet slice motor based on flux linkage identification

The control accuracy and dynamic performance of suspension force are confined in the traditional bearingless permanent magnet slice motor (BPMSM) control strategies because the suspension force control is indirectly achieved by adopting a closed loop of displacement only. Besides, the phase information in suspension force control relies on accurate measurement of rotor position, making the control system more complex. In this paper, a new suspension force control strategy with displacement and radial suspension force double closed loops is proposed, the flux linkage of motor windings is identified based on voltage–current model and the flexibility of motor control can be improved greatly. Simulation and experimental results show that the proposed suspension force control strategy is effective to realize the stable operation of the BPMSM.     

深井煤层群首采下保护层工作面瓦斯治理技术

本文以千米深井——朱集煤矿1242(1)首采工作面的瓦斯治理为例,提出并实施了地面钻井、高抽巷和采空区埋管相结合的瓦斯分源治理综合技术,分别抽采上覆13-1煤层卸压瓦斯、顶板瓦斯富集区瓦斯和上隅角瓦斯。实践表明,1242(1)工作面平均绝对瓦斯涌出量为68.8m3/min,地面钻井平均瓦斯抽采量为28.7m3/min,占瓦斯涌出量的42.2%,高抽巷平均瓦斯抽采量为30.7m3/min,占瓦斯涌出量的45.2%,瓦斯抽采率高达87.4%,回风流瓦斯浓度低于0.4%,实现深井高瓦斯煤层群首采下保护层工作面的安全高效开采。研究成果对类似条件矿井首采层工作面的瓦斯治理有指导价值。     

S －次仿紧空间

针对一些广义仿紧空间以及拓扑空间中半开集和半闭集的性质,本文将次仿紧空间的一些结论推广到半闭集的条件下,新定义并研究S －次仿紧空间的基本性质。首先给出一些基本的定义和定理,然后在此基础上定义S－次仿紧空间,最后得出一些主要结果：（1）空间X是S－次仿紧空间,则X的每一开覆盖U,存在半开加细覆盖序列｛Vn｝n∈N使对每一x∈X,存在n∈N,使ord（x,Vn）＝1,这里（ord（x,Vn）＝｜｛V：V∈Vn,x∈V｝｜）;（2）空间X是S－次仿紧空间,则X的每一开覆盖具有σ垫状加细覆盖;（3）如果（X,Fa）是S－次仿紧空间,则（X,F）也是S－次仿紧空间,并给出相应的证明。     

Limiting drainage criterion for groundwater of mountain tunnel

Large amount of groundwater discharging from tunnel is likely to cause destruction of the ecological environment in the vicinity of the tunnel, thus an appropriate drainage criterion should be established to balance the tunnel construction and groundwater.To assess the related problems, an limiting drainage standard ranging from 0.5 to 2.0 m3/（m·d） was suggested for mountain tunnels based on survey and comparative analysis. After that, for the purpose of verifying the rationality of the standard, a calculated formula for dewatering funnel volume caused by drainage was deduced on the basis of the groundwater dynamics and experience method.Furthermore, the equation about the relationship between water discharge and drawdown of groundwater table was presented. The permeability coefficient, specific yield and groundwater table value were introduced, and then combined with the above equation, the drawdown of groundwater table under the proposed limiting drainage criterion was calculated. It is shown that the proposed drainage standard can reach the purpose of protecting ecological environment under the following two conditions. One is the permeability coefficient ranges from 10-4 to 10-5 m/s and the specific yield ranges from 0.1 to 0.001. The other is the permeability coefficient varies from 10-6 to 10-8 m/s and the specific yield varies from 0.1 to 0.01. In addition, a majority of common geotechnical layers are involved in the above ranges. Thus, the proposed limiting drainage standard which ranges from 0.5 to 2.0 m3/（m·d） for mountain tunnel is reasonable.     

闭式太阳能系统应用于独立单元的研究

目前,闭式太阳能系统一般应用于整体供热的大系统中,不应用于分散独立的单元中,探讨闭式太阳能系统应用于分散独立单元有较大的实际意义。在居民建筑顶面(或是南方位立面)安装太阳能聚热器、太阳能光伏板、小水泵,在卫生间、厨房等热水应用点安装热水保温箱,通过利用太阳能光伏板电能驱动水泵,对闭式太阳能系统进行强制循环,保证室内保温箱上部充满热水满足使用需求。实践证明闭式太阳能系统应用于独立单元能与建筑有机结合在一起,获得较协调的建筑视角效果,提高太阳能热水的利用效率,有效节约水资源,取得了良好的经济效率。     

城市排水防涝规划编制要点探讨--以常州为例

以常州为例,探讨了平原水网城市排水（雨水）防涝综合规划编制要点,提出了从内涝风险评估、规划标准制定、防涝工程体系完善等方面加强规划研究,着重从河网水系梳理、排涝设施建设、市政雨水通道安排、易淹易涝片区整治、低影响开发等方面构建城市防涝工程体系,保障城市排水安全。     

Microstructure, mechanical and tribological properties of Cr1−xAlxN films deposited by pulsed-closed field unbalanced magnetron sputtering (P-CFUBMS)

Nanocrystallized Cr_1−xAl_xN films with various Al contents (0 to 68 at.%) were deposited by pulsed closed field unbalanced magnetron sputtering (P-CFUBMS). The effects of aluminum content on the microstructure, mechanical and tribological properties of the Cr_1−xAl_xN films have been investigated. It was found that the hardness and elastic modulus of Cr_1−xAl_xN films increased with increasing Al contents in the films and reached the highest value of 36 GPa and 370 GPa, respectively, at an Al content of 58.5 at.%. Addition of Al beyond 64.0 at.% resulted in a change in crystal structure from B1 cubic to B4 hexagonal phase. The wear resistance improved gradually with the increase of Al in the Cr_1−xAl_xN films. A combination of the abrasive and adhesive wear mechanism was proposed based on the SEM and EDS analysis of the wear track. The steady state dry coefficient of friction measured against a WC ball for the Cr_1−xAl_xN films were in the range of 0.36-0.55, and the wear rate was in the 10^− 6 mm³ N^− 1 m^− 1 range.     

热轧生产中重负荷齿轮油净化、除水新型净油机

针对重负荷的齿轮传动装置中齿轮油杂质含量大、含水量高且难以分离等问题，介绍了一种具备自动排水功能的新型离心式净油机。主要介绍了其工作原理、自动排水功能的设计及其附加特殊功能。应用表明，该离心式净油机能够高效地将油液中水、杂质快速分离并自动连续排出；此外，还具有强大的破乳化能力，去除油液中的溶解水，使油液中含水量低于0.05%，排出的水中含油量低至6.99 mg/L，远远低于30 mg/L的国家环保直排水指标要求；还有，对大颗粒杂质和15 μm以下的微小杂质均具有非常好的去除效果。采用新型离心式净油机，可有效提高油品利用率，降低成本消耗，提高设备使用寿命。