应用 Adabelief 优化器的 MSDNet 在多工况下 滚动轴承的故障诊断

针对滚动轴承在多工况条件下故障特征难以识别的问题,从数据驱动的角度出发应用一维多尺度密集网络(MSDNet)对轴承进行故障诊断。首先,将时域信号作为MSDNet的直接输入,保持了信号本有的固有特性;其次采用3个并行卷积操作来提取轴承故障信号内部的多尺度信息,密集网络的加入防止了信息传递过程中的特征丢失,适当缓解了模型中的梯度消失问题;然后训练过程中采用Adabelief优化算法优化模型参数,使得模型在快速收敛的同时又提高了其泛化性能;最后通过混淆矩阵和特征可视化图展示出模型的分类性能,在凯斯西储大学轴承实验数据集和西安交通大学数据集上进行了多次实验,应用该算法故障识别率可达到98%以上,证明了该方法的有效性。     

VHDL数据流描述模型的优化设计

基于集成电路进行数字系统设计时,依据电路性能指标的描述,首先构造输入输出关系的真值表,建立算法模型,直接依据行为描述的真值表而设计的电路结构不明确,不利于逻辑综合;在行为域分析基础上优化设计,可得数据流描述模型,使VHDL描述模型简化,但其描述对所设计电路结构不明确,VHDL描述过程中要考虑一系列不适用于逻辑综合的约束条件的限制;门级结构域层次化优化描述模型给出明确的设计电路结构,通过描述模型对逻辑门级仿真可得到精确的电路的时序信息。     

不同重要性结构的抗震设防水准

在分析各国建筑物重要性标定方法弊端的基础上，采用设计基准期TL来标定建筑的重要性类别，并通过分析给出了不同重要性建筑设计基准期的合理建议值，在计算了四类不同重要性建筑常遇、偶遇、罕遇地震相应于50a的超越概率后，通过分析各类建筑各级设防水准的重现期探讨了重现期的合理取值问题，研究表明，该方法物理概念清楚、工程意义明确，正确地体现了结构不同重要性类别的差别。     

Glutathione Deficiency during Early Postnatal Development Causes Schizophrenia-Like Symptoms and a Reduction in BDNF Levels in the Cortex and Hippocampus of Adult Sprague–Dawley Rats

Growing body of evidence points to dysregulation of redox status in the brain as an important factor in the pathogenesis of schizophrenia. The aim of our study was to evaluate the effects of l-buthionine-(S,R)-sulfoximine (BSO), a glutathione (GSH) synthesis inhibitor, and 1-[2-Bis(4-fluorophenyl)methoxy]ethyl]-4-(3-phenylpropyl)piperazine dihydrochloride (GBR 12909), a dopamine reuptake inhibitor, given alone or in combination, to Sprague–Dawley pups during early postnatal development (p5–p16), on the time course of the onset of schizophrenia-like behaviors, and on the expression of brain-derived neurotrophic factor (BDNF) mRNA and its protein in the prefrontal cortex (PFC) and hippocampus (HIP) during adulthood. BSO administered alone decreased the levels of BDNF mRNA and its protein both in the PFC and HIP. Treatment with the combination of BSO + GBR 12909 also decreased BDNF mRNA and its protein in the PFC, but in the HIP, only the level of BDNF protein was decreased. Schizophrenia-like behaviors in rats were assessed at three time points of adolescence (p30, p42–p44, p60–p62) and in early adulthood (p90–p92) using the social interaction test, novel object recognition test, and open field test. Social and cognitive deficits first appeared in the middle adolescence stage and continued to occur into adulthood, both in rats treated with BSO alone or with the BSO + GBR 12909 combination. Behavior corresponding to positive symptoms in humans occurred in the middle adolescence period, only in rats treated with BSO + GBR 12909. Only in the latter group, amphetamine exacerbated the existing positive symptoms in adulthood. Our data show that rats receiving the BSO + GBR 12909 combination in the early postnatal life reproduced virtually all symptoms observed in patients with schizophrenia and, therefore, can be considered a valuable neurodevelopmental model of this disease.     

Capturing Preservice Chemistry Teachers’ Visual Representations of Redox Reactions through Storyboards

This study aimed to identify preservice chemistry teachers’ understanding of redox reactions at the submicroscopic level and how they make connections to macroscopic level. Twenty‐five preservice chemistry teachers first viewed a video of a redox reaction happening between a zinc wire and a copper(II) sulfate solution, then they reflected on their macroscopic observations, and generated storyboards (a sequence of drawings) representing this reaction at the submicroscopic level. Both the reflections and the storyboards were coded, and the categories reflecting the participants’ levels of understanding were determined. Results showed that the participants usually identified the macroscopic evidences, but they had conceptual difficulties in interpreting and representing evidences at the submicroscopic level. Few participants indicated a scientific or a moderate understanding of redox reactions, whereas the majority exhibited either weak or alternative understanding of redox reactions.     

YⅪ一RuXⅥ离子3d^10 4l（l=s，p，d，f）组态能级的逐插计算方法研究

在准相对论HXR方法计算的基础上，分析了等电子序列离子能级结构的特点，提出了一种高剥离态离子能级新的逐插计算方法．计算了YXImRuxⅥ离子3d^10 4l(l=s，p，d，f)组态能级，其结果与已有实验结果相当符合．而TcXV离子的所有能级值纯属预测计算结果．     

我院数学教学改革的实践与探讨

我院数学教学改革的实践是"因材施教,分层教学"。这种多层次、多形式的培养模式,收到了良好的效果,使得一批优秀生脱颖而出,提高了数学教学质量。     

数字水准仪编码标尺图像识别算法

针对数字水准仪编码标尺所包含的信息，设计了一种基于相位差法编制的数字水准仪编码标尺．然后以该数字水准仪编码标尺为识别对象，提出了一种数字水准仪编码标尺图像识别算法．首先识别编码标尺上黑白条码宽度，确定出参考码R和信息码A、B．其次判断CCD中心线与信息码A、B中心线的位置关系，依据已知参考信息A、B码中心线位置对应的高度值，可确定编码标尺读数．模拟测量结果表明：在对数字水准仪编码标尺图像信息完成数据采集和图像处理、边缘检测、二值化数字图像处理后，利用该算法能够准确识别出编码标尺上黑白条码的实际宽度和编码标尺读数．     

雷达装备参数项目测试级别分析

针对雷达装备参数项目测试级别分析中存在的评价因素多、信息模糊等导致评价结果不合理问题,引入模糊综合评判法来构建评价模型.该模型定义了影响参数项目测试级别的因素量化标度,建立了评价因素集、评语集和权重集,通过专家打分方式构建了单因素评判矩阵,采用加权平均法求得模糊综合评价集和综合评价结果,从而确定被评参数项目的测试级别.实例分析表明:该方法的评价结果合理,可信度高,能较好地解决雷达装备参数项目测试级别的确定问题.     

企业资本营运综合评价的

首先从筹资,生产经营,获得利三个环节设定了企业资本营运评价的指标体系,然后运用计算分综合分析法建立企业资本营运评价的数学模型,根据指标体系所具有的层次结构,采用层次分析法确定各层次指标的权数,从而可以计算出企业资本营运综合指数,实现对企业资本营运能力的定量评价。