模糊神经网络在驾驶员疲劳检测中的应用

针对驾驶员疲劳检测算法中数据量大、高速传输、复杂运算的实际需要,以DSP器件TMS320DM642为核心处理器,开发了嵌入式的驾驶员疲劳驾驶状况实时监测系统;为解决因疲劳/瞌睡驾驶而造成的交通事故,针对国内各种疲劳检测方法大都采用单一的疲劳特征进行疲劳识别的现状,运用模糊神经网络方法,将多个疲劳特征参数:眼睛闭合时间占某特定时间的百分率(PERCLOS)、眼皮的平均闭合速度(AECS)、点头频率(NodFreq)、哈欠频率(YawnFreq)结合起来对驾驶员疲劳状况进行识别,准确率达88.7%.试验结果表明,算法对疲劳检测问题有较好的效果,系统的开发对降低因驾驶疲劳引发交通事故发生率的研究具有重要意义.     

电涡流缓速器制动力矩的实时控制

为了使装有电涡流缓速器的车辆在下坡时能以稳定的速度行驶,以电涡流缓速器的制动力矩和励磁电流的关系为依据,应用脉宽调制(PWM)技术实现电涡流缓速器制动力矩的无级调节.分析了车辆下坡运行的工况,以车辆的速度和瞬时加速度产生的惯性力作为电涡流缓速器制动力矩的控制依据,提出了电涡流缓速器制动力的无级控制策略,并绘制了控制流程.利用实车的不同初始运行工况进行模拟,计算结果表明,对车辆电涡流缓速器制动力矩的实时控制能使车辆在坡道上以稳定的目标速度行驶.     

郑州市技术交易发展现状及对策分析

技术交易是推动科技与经济紧密结合的重要途径。郑州市"十二五"以来,技术交易日益活跃。本文对2017年郑州市技术交易发展现状及特点进行了分析,针对技术交易中存在的问题提出了对策建议,以期促进郑州市技术交易和技术转移转化。     

珊瑚礁灰岩物性特征及工程性质研究进展

 礁灰岩是珊瑚礁岩体的基础和主体部分，其物理力学特征及工程性质的研究在海洋开发建设中具有重要的战略意义。国内外对不同地区礁灰岩的研究表明，礁灰岩具有高孔隙、低密度、低强度的物理性质，且由于成岩作用复杂，其岩石结构发育具有不均匀性，不同胶结程度的礁灰岩具有不同的应力响应，这与其他常规软岩及脆性岩石性质相比明显不同。目前对礁灰岩的研究总体上仍处于初级阶段，尚不能很好地解决珊瑚礁工程建设中的诸多难题，需要系统地开展更加深入的研究。建议首先进行科学的结构分类，加强对不同结构类型礁灰岩的物理力学特征、工程性质、微观胶结机理以及海水侵蚀作用对其物性特征影响等方面的研究。     

Microstructure and improved mechanical properties of ultrafine-grained Mo-12Si-8.5B (at.%) alloys with addition of ZrB2

Multi-hierarchical Mo-12Si-8.5B-x Zr B_2(x=0,0.5,1.0,1.5,2.5 wt%)alloys consisting of three ultrafine-grained(UFG,0.47–0.81μm)phases of Mo_5Si B_2(T2),Mo_3Si and Mo solid solution(α-Mo)were prepared by mechanical alloying following hot pressing.Microstructure observations showed that the intermetallic phases(Mo_3Si and T2)distributed dispersedly in the continuousα-Mo matrix associated with the homogeneously embedded nanoscaled particles(10–225 nm)in the grain interiors and at the grain boundaries.The Mo-12Si-8.5B-x Zr B_2alloys exhibited monotonically increasing compressive strength to 3.13 GPa with increasing content of Zr B_2,and the fracture toughness increased about 27%and reached at 11.5 MPa m~(1/2)at 1.0 wt%Zr B_2,rendering the Mo-12Si-8.5B-1.0 wt%Zr B_2alloy possessing the best combined mechanical properties of high strength and high toughness.The underlying reason for the superior mechanical properties of the Mo-12Si-8.5B-x Zr B_2alloys is that the dispersedly distributed nanosized particles in the UFG multi-phased-matrix can not only effectively block the dislocation motion to increase the strength but also store the dislocations to increase the strain hardening ability during mechanical deformation.     

An Inverse Power Generation Mechanism Based Fruit Fly Algorithm for Function Optimization

As a novel population-based optimization algorithm, fruit fly optimization(FFO) algorithm is inspired by the foraging behavior of fruit flies and possesses the advantages of simple search operations and easy implementation. Just like most population-based evolutionary algorithms, the basic FFO also suffers from being trapped in local optima for function optimization due to premature convergence.In this paper, an improved FFO, named IPGS-FFO, is proposed in which two novel strategies are incorporated into the conventional FFO. Specifically, a smell sensitivity parameter together with an inverse power generation mechanism(IPGS) is introduced to enhance local exploitation. Moreover,a dynamic shrinking search radius strategy is incorporated so as to enhance the global exploration over search space by adaptively adjusting the searching area in the problem domain. The statistical performance of FFO, the proposed IPGS-FFO, three state-of-the-art FFO variants, and six metaheuristics are tested on twenty-six well-known unimodal and multimodal benchmark functions with dimension 30, respectively. Experimental results and comparisons show that the proposed IPGS-FFO achieves better performance than three FFO variants and competitive performance against six other meta-heuristics in terms of the solution accuracy and convergence rate.     

页岩自支撑裂缝导流能力预测方法研究

页岩气井的产能主要取决于支撑剂充填层裂缝和储层剪切滑移形成的自支撑裂缝提供的导流能力，目前对页岩自支撑裂缝导流能力变化规律和影响机理的认识仍不够充分，采用分形理论方法，引入裂缝开度分形维数和迂曲度分形维数对裂缝空间进行定量表征，建立了考虑闭合应力作用的自支撑裂缝导流能力数学模型。开展自支撑裂缝导流能力实验，结果显示初期裂缝导流能力可达30~50 D·cm，在40 MPa的闭合压力下仍可保持在1 D·cm以上；理论模型预测的结果与实验测试结果基本吻合；模型敏感性分析表明，裂缝开度分形维数与导流能力呈正相关关系；迂曲度分形维数与导流能力呈负相关关系。利用此方法可实现自支撑裂缝导流能力的快速、准确预测，为合理预测气井产能提供支撑。     

宇宙、“基本粒子”及其联系

本文以现代最新、最可靠的数据和理论对宇宙、“基本粒子”及其联系进行了论述。     

DIFFERENTIAL PULSE VOLTAMMETRIC DETERMINATION OF 3,3''''5,5''''-TETRAMETHYLBENZIDINE AND ITS ANALOGUES WITH A GLASSY CARBON ELECTRODE

The differential pulse voltammetric (DPV) method-with a glassy carbon electrode was used for the determination of 3,3' 5,5'-tetramethy lbenzidine (TMB), o-tolidine and benzidine in the acidic media. The pulse amplitude, interval time and scan rate of DPV are optimized to be 50 mV, 0. 5 s and 10 mV/s, respectively. The peak current, is proportional to the concentration of TMB and its analogues, the linear range is from 10~(-6)mol/l to 10~(-4)mol/l. The electrochemical behaviour of the compounds is discussed. The chemical poisons can be determined directly, or indirectly by the extraction in the waste water of chemical industry and laboratory.     

应用折返式拉丝机生产冷轧带肋钢筋的工艺研究

研究了在折返式拉丝机上应用反张力拉拨技术生产冷轧带肋钢筋的工艺，从理论和实践的两方面揭示了反张力与金属变形能耗的关系，还就如何控制和提高产品机械性能进行了讨论。