无线传感器网络的路灯远程控制系统设计

本设计基于TI公司的CC2480/ZigBee开发系统,设计了无线控制平台,论证了网络的组成、软件流程以及节能模式,旨在提供一种基于ZigBee无线技术的城市路灯照明系统解决方案,从而设计出低成本、高效能、全自动化的城市照明系统。     

沥青带水磺化工艺的研究

通过沥青磺化过程的主反应和副反应，进一步讨论了磺化工艺的原理，磺化试剂的选择，溶剂的组成，带水速度，溶剂的回收方式等各种因素对产品质量的影响。     

A novel and versatile method for the synthesis of soluble fullerenated polymers

Summary A new route for the preparation of soluble fullerenated polymer through the reaction of carbanion intermediates of polymers with fullerenes, particularly C₆₀, is demonstrated. Confirmation of the covalent attachment of C₆₀ to the polystyrene backbone is by a variety of techniques such as UV-Vis, FT-IR, TGA, SEM and ¹³C NMR etc. The product, which has a visibly brownish yellow cast when compared with the unreacted polymer, is soluble in some common organic solvents. The thermal stability of pure polystyrene is enhanced by C₆₀-chemical modification, and no bonds within the carbon sphere are broken.     

基于Creator的战场地形仿真研究

如何解决地形模型精细度、逼真度与仿真速度之间的矛盾是军事仿真的难点问题。本文研究了三维地形生成的关键技术,并详细阐述了利用MultiGen Creator建模工具,采用DEM数据和卫星遥感影像数据构建和优化大面积战场地形的原理和方法,最后结合实例生成战场地形。仿真结果表明,该方法生成的模型达到了精细度高、真实感强、实时性好等仿真要求。     

Evaluation of group effect of pile group under dragload embedded in clay

A simple semi-empirical analysis method for predicting the group effect of pile group under dragload embedded in clay was described assuming an effective influence area around various locations of pile group. Various pile and soil parameters such as the array of pile group, spacing of the piles (S), embedment length to diameter ratio of piles (L/D) and the soil properties such as density (γ), angle of internal friction (φ) and pile-soil interface friction coefficient (μ) were considered in the analysis. Model test for dragload of pile group on viscosity soil layer under surface load consolidation conditions was studied. The variations of dragload of pile, resistance of pile tip and the layered settlement of soil with consolidation time were measured. In order to perform comparative analysis, single pile was tested in the same conditions. The predicted group effect values of pile group under dragload were then compared with model test results carried out as a part of the present investigation and also with the values reported in literatures. The predicted values were found to be in good agreement with the measured values, validating the developed analysis method. The model test results show that negative skin friction of pile shaft will reach 80%–90% of its maximum value, when pile-soil relative displacement reaches 2 mm. Foundation item: Project(50679015) supported by the National Natural Science Foundation of China     

蓄能器在全液压注塑机的应用以及节能效果研究

为了节约传统液压注塑机液压阀溢流损耗能量,对传统的全液压注塑机的油路进行改造,加入自行研制的蓄能器节能模块;对改造完成的节能注塑机进行能耗测试并与未改造的传统注塑机进行能耗比较,发现蓄能器模块加入液压注塑机后的整机能耗有明显降低,能实现预期的节能降耗目的;在不同的塑化注射压力下、不同的塑化背压下、不同保压时间下,对节约能耗数据进行测量分析,并从机理上分析能耗数据的差异,研究蓄能器模块使液压注塑机能耗降低的原因.     

Effects of a strong polyelectrolyte on the rheological properties of concentrated cementitious suspensions

Strong polyelectrolytes, referred to as superplasticizers, are known to improve the initial fluidity of concentrated cement suspensions. To quantify how the polyelectrolytes affect the fluidity, we have studied the effect of a strong anionic polyelectrolyte, melamine formaldehyde sulfonate (MFS), on the zeta potential of cement particles and on the steady-shear and low-amplitude rheological properties of cement suspensions. Adsorption of low concentrations of MFS onto the cement particles leads to an inversion in the sign of the surface potential, causing the electrostatically flocculated particles to become electrostatically dispersed and giving rise to a corresponding decrease in the steady-shear viscosity and storage modulus. At an intermediate MFS concentration, the steady-shear viscosity and the storage modulus each display a minimum. This concentration corresponds to that at which the zeta potential becomes constant. Larger concentrations of MFS result in an increase in the viscosity and storage modulus, which is attributed to depletion flocculation. These results thus relate the interaction between particles to the suspension fluidity through the analysis on the surface potential of particles and microstructure of suspension.     

基于VB和AutoCAD的纸盒辅助设计系统

在总结现有盒型特点并对其进行科学分类的基础上,结合Visual Basic语言与AutoCAD各自优势,开发具有盒型结构的参数化设计、材料使用率与消耗量、数据存储采集等功能的包装纸盒设计系统,达到提高绘图效率,简化开发过程,实现优化设计的目的。     

基于改进的BSMOTE和时序特征的风机故障采样算法

针对风机数据集的不平衡问题,提出了一种BSMOTE-Sequence采样算法,在合成新样本时综合考虑空间和时间特征,并对新样本进行清洗,从而有效减少噪声点的生成。首先,根据每个少数类样本的近邻样本的类别比例,将少数类样本划分为安全类样本、边界类样本和噪声类样本。然后,对每个边界类样本都遴选出空间距离、时间跨度最接近的少数类样本集,利用线性插值法合成新样本,并过滤掉噪声类样本以及类间重叠样本。最后,以支持向量机（SVM）、卷积神经网络（CNN）、长短期记忆（LSTM）人工神经网络作为风机齿轮箱故障检测模型,F1-Score、曲线下面积（AUC）和G-mean作为模型性能评价指标,在真实风机数据集上把所提算法与常用的多种采样算法进行对比,实验结果表明：相比已有算法,BSMOTE-Sequence算法所生成样本的分类效果更好,使得检测模型的F1-Score、AUC和G-mean平均提高了3%,该算法能有效地适用于数据具有时序规律且不平衡的风机故障检测领域。