GIS支持下的山区遥感影像决策树分类研究

以福建省顺昌县为研究区,首先利用光谱、纹理等信息对森林进行初分类;在此基础上,分析各森林类型在不同地形条件下的混淆情况,借助GIS手段,建立再分类规则,实现森林分类精度的提高.从分类总精度看,再分类结果较初分类结果高出9.11%,而Kappa系数则高出0.134 8,说明GIS支持下的决策树分类可较大幅度地提高南方山地丘陵区域的森林分类精度,具有良好的应用前景.     

皮江法炼镁工艺用能状况诊断及节能措施

系统分析了我国金属镁生产过程中广泛应用的皮江法工艺的能源利用状况。分析表明,皮江法炼镁工艺中所使用的热工设备热效率很低。针对这些工艺过程和热设备的用能现状,提出了一些具体的节能措施。     

激光熔覆稀土陶瓷涂层进展

综述了激光熔覆稀土陶瓷涂层研究现状及其最新进展。介绍了激光熔覆工艺特点和影响因素,激光熔覆工艺包括粉末材料的加入方法和激光辐照加工。加入方法分预置法和同步送粉法,工艺参数包括光斑尺寸、扫描速度、熔覆道次、送粉量、涂层厚度和搭接量等。研究认为正确选择工艺参数是保证熔覆层质量和性能的关键。总结了稀土添加剂的强化作用机制,其主要作用为微合金化、净化晶界、细化晶粒、改善晶界状态、抑制柱状晶生长。对激光熔覆稀土陶瓷涂层研究的发展进行了展望。     

莱钢战略客户影响因素分析及保持探讨

根据莱钢战略客户的特点,从分析客户占有率入手,建立客户购买数量趋势模型对市场和客户需求进行分析;利用“企业-客户”价值模型,探讨了影响企业战略客户关系的因素,提出了莱钢应通过增加客户效用、降低客户成本的方法保持战略客户。     

Activity Calculation in Complex Metallurgical Molten Slag Systems Based on Regular Solution Model

 The activity of FetO is very important in ironmaking and steelmaking process. In order to predict the activity of FetO and optimize the operation conditions in ironmaking and steelmaking process, by application of regular solution model in molten slag systems, FeO-Fe2O3-SiO2 ternary system, FeO-Fe2O3-SiO2-CaO and FeO-Fe2O3-SiO2-NiO quaternary systems have been studied by the chemical equilibrium between H2/H2O gas mixture and liquid slag contained in solid iron. The values of interaction energy between cations concerning steelmaking slags have been determined by application of ferric-ferrous iron equilibrium and iron-ferric iron equilibrium. And then the activity of FetO can be calculated. The results show that the relative error is 39% in FeO-Fe2O3-SiO2 system and 18% in FeO-Fe2O3-SiO2-CaO system. The prediction of activities of FetO in the systems are in good agreement with the measurements and the regular solution model is valid for predicting the activity of FetO in complex molten slags systems. The activity of FetO in FeO-Fe2O3-NiO system have not been tested presently, and the calculated result can not be assessed.     

Study on Compound Effect of Bonded Magnets

The compound effect of Nd2Fe14B/Fe3B-Ferrite bonded magnets was studied.The result shows that the value ofβjHC obviously decreases with the ferrite content increasing.In addition, a functional relation between magnetic properties and ferrite content was clearly revealed by the physical relation in the magnetic powders.     

Analysis of Laser Surface Hardened Layers of Automobile Engine Cylinder Liner

 The effects of rare earth (RE) on the microstructures and properties of high carbon high speed steel (HCHSS) were investigated. The results show that when suitable RE is added to the HCHSS, the effect of RE on the austenite and eutectic carbides is obvious. The austenite grain and coarse eutectic structure are refined, and flake carbides in the eutectic structures become short and fine. After heat treatment, most of the eutectic carbides are spheroidized and distributed in a uniform manner. The hardness and red hardness of modified HCHSS are slightly increased; impact toughness is greatly increased by 3781% and reaches 1017 J/cm2. The mechanism by which RE improves the structures and properties of HCHSS is also analyzed.     

钢水温度和碳对镁铝尖晶石质耐火材料侵蚀的影响

根据热力学分析和热态实验研究了钢水温度及其碳质量分数对镁铝尖晶石质耐火材料侵蚀的影响,并探讨了耐火材料的侵蚀机理。研究表明,提高温度将加剧钢水对耐火材料的侵蚀,随钢水中碳质量分数的增加,耐火材料的侵蚀指数先增加后减小。侵蚀机理包括：一是钢水中碳与耐火材料组分氧化镁反应化学侵蚀耐火材料;二是钢水向耐火材料内部的渗入以及低熔点物相在耐火材料颗粒界面的析出,降低了耐火材料颗粒间的结合力,加剧了钢水冲刷对耐火材料的损毁程度。     

碳和磷对热轧带钢氧化铁皮起泡行为的影响

氧化铁皮的起泡行为发生在热轧过程,当铁皮发生起泡现象时,铁皮界面气体压力增加造成铁皮被顶起,在热轧轧制中起泡的铁皮被碾碎易于形成麻点和铁皮压入缺陷.通过热重分析手段和扫描电镜微观观察研究了超低碳钢、超低碳含磷钢、低碳钢、中碳钢在加热过程中铁皮的起泡行为,重点探讨了磷和碳元素对铁皮起泡行为的影响.研究表明,在980℃附近磷元素形成Fe3(PO4)2,此相高温下易于熔融气化造成铁皮起泡;在1050℃以上的高温区间,碳元素活性增高,随着铁皮生长界面碳元素的富集氧化,形成CO和CO2对铁皮起泡影响明显,高温试样铁皮气孔和裂纹密集.     

激光辅助冷喷涂技术应用进展

激光辅助冷喷涂技术是基于冷喷涂的原理,综合冷喷涂和激光熔覆的优点为一体的复合涂层沉积技术,可以沉积致密匀称、孔隙率可控的功能涂层,而且沉积速度快、涂层废品率低。本文主要介绍了该技术的原理及其最新应用范围,阐述了采用该技术在制备Stellite-6合金涂层、Ti涂层、Al-12 wt.%Si涂层、Ni60基金刚石复合涂层、Ti-HAP复合生物涂层等不同领域的应用优势。激光辅助冷喷涂技术的应用是激光用于工程部件表面修饰、涂层制备,提升部件性能的一个新趋势。