卷烟厂废水处理工程研究

武汉卷烟厂采用序列间歇式活性污泥法(SBR)结合增氧器CWJ-10处理卷烟综合废水,经过3年的运行实践表明,工艺运行稳定可靠,在进水COD为300～1 000 mg/L、SS为100～500 mg/L、BOD5为100～500 mg/L,NH3-N为10～20 mg/L,TP为1.0 mg/L时,出水COD＜70 mg/L、BOD5＜20 mg/L、SS＜30 mg/L、NH3-N＜5 mg/L,TP＜0.5 mg/L,完全实现达标排放.     

单纯形法中确定主元素的两个新法则

给出了单纯形法中确定主元素的两个新法则,即"按使目标函数值增加得最多的原则确定主元素"和"按使目标函数值增加得最快的原则确定主元素",并以实例说明了应用这两个法则来确定主元素较应用"最大口法则"来确定主元素.具有迭代次数更少、收敛速度更快的特点.     

Effect of the Three Gorges Reservoir on vertical distribution of suspended sediment concentration and estimation accuracy of depth-average concentration in downstream reaches

The sediment regime in the middle Yangtze River has been significantly changed from quasi-equilibrium to nonequilibrium since the impoundment of the Three Georges Reservoir (TGR). To understand the effects of the TGR on vertical distribution of suspended sediment concentration (SSC) and estimation accuracy of mean concentration, vertical sediment concentration and flow velocity data at the Shashi and Jianli hydrological stations in the reach before and after the impoundment were collected. Comparisons and analysis of vertical profiles of SSC before and after the TGR impoundment show that after the impoundment of the TGR, due to the coarsening of sediment particle size, the reduction in sediment load, and the significant decrease in sediment saturation, the vertical distribution of SSC in the downstream reaches became more uneven under medium and low water flows, which was reflected in the vertical gradient and the fluctuation degree of SSC significantly increased. In addition, the depth-average sediment concentrations were calculated by the selected-point method and the mean values calculated by the “multi-point method” were regarded as the “true mean” to evaluate the accuracy of the mean value calculated by the “few-point method.” It was found that the relative errors for the selected-point method were mainly positive before impoundment but mainly negative after impoundment. Additionally, the correction factors of one-point, two-point, and three-point methods and the position of the near-bed substituted point for the five-point method were given to reduce the error when the point measurements were used to calculate the depth-average sediment concentration in the downstream reaches.     

基于超网络的集成工艺决策与调度问题研究

针对多工艺产品的加工路线决策与车间调度方案不能同步制定的问题,在制造车间数字化背景下,提出集成车间不同要素信息的特征—工序—机器—工人的超网络结构,建立基于超网络的加工路线决策与车间调度模型,设计一种集成工艺决策与车间调度的两阶段混合遗传算法求解模型。在工艺决策阶段,设计特征—工序双层矩阵编码染色体保持加工路线的多样性,并在遗传算法的执行过程中使用变邻域搜索方法增强算法的局部搜索能力;在车间调度阶段,采用NSGA-Ⅱ算法优化调度模型,将得到的调度方案多目标值返回至工艺决策阶段用于加工路线的适应度评价。最后通过仿真实验验证了该算法的可行性与有效性。     

压缩感知算法在阵列测向中的相干信号分辨

现有算法在进行信号重建时,需要原始信号的稀疏信息来控制初始原子集的大小和算法迭代的最大次数,这削弱了重建精度,增加了计算复杂度,限制了其实际应用能力。为了克服这个问题,提出了基于正交匹配追踪算法的改进算法。该算法将阵元个数作为假设稀疏度,在稀疏度未知的初始阶段扩展初始原子集。最后通过对测量信号的幅度进行阈值过滤以实现信号的分辨和信源数的估计。为解决测向人员面对监测软件所指示的多个信号示向度中,无法分辨哪些指示方向是同一个信号源所产生的折反射信号的问题,首次提出了基于压缩感知算法的相干关系分析和相干信号分辨的模型。实测数据结果表明,该算法在不同环境下可以清晰分辨相干信号,并且能够适应多种实验平台。     

利用局部监督的跨模态行人重识别研究

跨模态行人重识别技术旨在从非重叠视域不同模态的摄像头捕获的行人图像中,识别出特定行人,行人图像间存在巨大的跨模态差异以及模态内部差异,导致识别率不高。为此,提出了一种利用局部监督的跨模态行人重识别方法(LSN)。首先将可见光图像转换成与红外图像更为接近的灰度图像,在图像层面缓解跨模态的差异,并使用共享参数的双流网络,提取具有判别性的共享特征,在特征层面缓解跨模态差异;其次,设计了局部监督网络,增强了对背景、遮挡等噪声的鲁棒性,缓解了模态内部差异;最后,设计了跨模态分组损失、联合身份损失对网络进行约束。实验结果显示,在SYSU-MM01数据集上,评价指标rank-1和mAP分别达到了53.31%、50.88%;在RegDB数据集上,达到了73.51%、68.55%,实验结果优于同类方法,验证了该方法的有效性和先进性。     

“EM”水玻璃自硬砂的应用

本文介绍了一种可用于大型铸铜件的“EM”水玻璃自硬砂.通过实验及实际生产验证,该砂在满足强度要求的同时还可明显减少水玻璃的加入量,且该砂的溃散性很好,各方面均优于传统的水玻璃砂.     

A precipitate phase in AA2124

A new precipitate phase (designated X phase) other than the S(Al₂CuMg) precipitate phase has been discovered in the 2124 aluminium alloy. Using selected-area electron diffraction analysis, dynamical diffraction simulation, energy dispersion analysis of X-rays and high-resolution electron microscopy, it is suggested that the X phase has an orthorhombic crystal structure witha=0.492 nm,b=0.852 nm andc=0.701 nm. The space group of the phase is Cmmm. There are 10 atoms in a cell with AlCuMg=244. The orientation relationship between the X phase and the matrix is determined as (1–10)_m(010)_x, [–1–1–1]_m [001]_x.     

基于GPS数据和压缩栅格算法的城市路网电子地图快速构建方法

路网电子地图对城市交通管理领域有重要的作用,但是地图服务机构提供的接口功能有限,商用地图一般价格高昂;而一些基于GPS数据的地图生成算法非常复杂、速度慢,在一些实际应用中受到限制,如区域地图即时更新、道路临时管制、应急路线规划等.为此提出一种直观、可扩展、操作灵活的城市道路地图构建方式.通过奥赛罗坐标化的方式,对单位栅格的表示方式进行重新设计,在改善栅格地图的拓扑表达能力、弥补栅格地图存储空间较大和处理时运算资源需求较多等弊端的同时,实现了地图的快速构建.文章以公共交通服务评估和路网韧性评价为例,展示了这一方法的应用潜力.     

基于人工智能的儿童坐姿监测系统

近年来,我国儿童青少年的近视率呈上升趋势,引起近视的原因有很多,不正确的学习姿势也会增加近视发病的风险,可能还会影响儿童的成长发育。许多家长都十分重视儿童的学习坐姿问题,但却由于各种原因难以做到时刻的监督。针对这一问题,设计了一个基于人工智能的儿童坐姿监测系统。系统的核心为微型电脑,控制摄像头拍摄照片,再通过坐姿识别模型识别照片中的坐姿,在儿童保持低头等错误坐姿时,发出语音提醒其纠正。系统能利用卷积神经网络识别坐姿,及时且有针对性地提醒纠正,并且程序移植到了嵌入式平台,体积小巧,操作简便。