Investigation of emulsion and effect on emission in CI engine by using diesel and bio-diesel fuel: A review

The exhaust of diesel engine is a main significant air pollution source which affects the environment and human life. A number of researchers have contributed their valuable efforts from each and every perspective to reduce air pollution. In the present work in-depth analysis is done on the recent investigation which is carried out in the field of alternative Fuels. The study examines the result of several aspects of emulsion stability and also investigated variables such as type of surfactant, mixing speed, mixing time and various additives and its effect on emission. Higher mixing speed with less water percentage increases emulsion stability. The objective of this paper is to highlight the analysis on W/D emulsion fuel, emulsion fuel stability and effect of W/D fuel on combustion, performance and emission characteristic. The results disclose an enhancement in engine performance and reduction of harmful emission for various additives compared to diesel.     

HC轧机板形控制系统的设计

本文以武钢冷轧薄板厂的六辊 HC轧机为对象 ,给出了液压弯辊调整量及中间辊横移量与板形偏差关系的模型 ,并将模糊控制应用于冷却液分段控制中 ,以消除高次波形 ,从而提高了整个板形控制系统的控制质量     

电子探针参数设置对钢板表面富集元素表征的影响

以HC300W热成型钢为研究对象,摸索了电子束流、加速电压和束斑尺寸等电子探针分析参数对钢板表面富集元素表征的影响,并考察了不同露点下试样表面元素的分布情况和变化趋势.结果表明:随着电子束流从50 nA、100 nA增大到200 nA时,电子探针所表征的钢板表面平均颗粒尺寸从3.66μm、5.72μm增大到7.91μm...     

几种烟幕对CO2激光的衰减性能研究

分析了CO2激光在军事上应用的主要特性及烟幕对激光的衰减原理,阐述了在烟幕试验柜中测试烟幕对激光的质量消光系数的试验方法和主要步骤。测试了红磷、HC和石墨烟幕对CO2激光器发射的10．6μm激光的消光系数,并绘制了激光功率随时间变化的曲线。依据实验结果,石墨烟幕对CO2激光具有良好的消光作用,质量消光系数为1．284m^2／g;红磷烟幕对该波段激光具有较为明显的削弱作用,质量消光系数为0．603m^2／g;HC烟幕对该波段激光几乎没有衰减作用,质量消光系数小于0．1m^2／g。分析表明,烟幕对10．6μm激光的消光系数随入射光的功率增加而下降,空气湿度增加,则红磷和HC因幕的消光系数将明显增大。     

HC08系列单片机C语言的若干编程技术

讨论MC68HC08系列单片机的C语言编程技术,分析了08C语言在寄存器和I／O口的使用、嵌入汇编及中断处理上与标准C的区别,并论述．1st文件在08C语言编程中的重要作用,探讨了规范编程、精简和优化代码等08C语言编程技术。     

M68HC908系列单片机编程器研究

M68HC908系列8位单片机,是由MOTOROLA公司的产品.它具有价格低、速度快、功能强和功耗低等优点,有广阔的应用前景.但MOTOROLA单片机的开发平台较贵,限制了它的应用推广.针对M68HC908系列中的小RAM单片机,介绍了一种简易高效编程器的软件实现方法.本文用VB编写编程器软件界面与通信软件,控制PC机与目标单片机的通信,底层软件用摩托罗拉专用汇编语言编写,利用固化在单片机内部的例程进行编程,实现了简化程序设计、提高编程效率的目的,大大降低了开发成本.     

Liquid crystalline elastomer actuators with dynamic covalent bonding: Synthesis,alignment, reprogrammability,and self-healing

Liquid crystalline elastomers (LCEs) have demonstrated tremendous potential in applications such as soft robotics, biomedical materials, electronics, sensors, and biomimetic systems. The physical properties of LCEs are controlled by the degree of crosslinking, nature of the mesogens, and mesogen orientation in the LCE network structure. A wide range of dynamic covalent bonds (DCBs) capable of dynamic bond exchange reactions (DBERs) have been introduced into LCE structures to obtain intelligent materials in recent decades. In this review article, we discuss the molecular constitution, macrostructure, morphing mechanism, recent advances in LCEs with dynamic covalent bonds, the influence of DCBs on self-healing, reprogramming and reprocessing properties of LCE actuators, and challenges and opportunities in incorporating dynamic chemistry in the field of LCE actuators.     

基于改进自注意力机制的金字塔场景解析网络

金字塔场景解析网络存在图像细节信息随着网络深度加深而丢失的问题，导致小目标与物体边缘语义分割效果不佳、像素类别预测不够准确。提出一种基于改进自注意力机制的金字塔场景解析网络方法，将自注意力机制的通道注意力模块与空间注意力模块分别加入到金字塔场景解析网络的主干网络和加强特征提取网络中，使网络中的两个子网络能够分别从通道和空间两个方面提取图像中更重要的特征细节信息。针对现有的图像降维算法无法更好地提高自注意力机制计算效率的问题，在分析“词汇”顺序对自注意力机制计算结果影响的基础上，利用希尔伯特曲线遍历设计新的图像降维算法，并将该算法加入到空间自注意力模块中，以提高其计算能力。仿真实验结果表明，该方法在PASCAL VOC 2012和息肉分割数据集上的精度均有提高，小目标与物体边缘分割更加精细，其中在VOC 2012训练集中平均交并比与平均像素精度分别达到75.48%、85.07%，较基准算法分别提升了0.68、1.35个百分点。     

HC340/590DP钢板激光焊可行性分析

HC340/590DP双相钢在氧化性介质中具有优良的耐蚀性能和高温力学性能,其塑性和韧性较高,且不可淬硬,焊接性能较好。通过分析其化学成分、力学性能和焊接性,利用激光焊技术的1k W激光发生器、激光头、光学系统、机器人、控制系统、夹具系统和外围周边集成等组成的系统进行大量试验、检测及焊接过程控制,确定焊接参数为:焊接速度40 mm/s、功率1 k W、光斑直径0.6~0.8 mm,获得的焊接接头既能焊透又不塌陷,表面成形较好,熔宽合适,确保试件的焊接接头性能满足实际需要,达到生产化的目的。