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Advanced Aspects of Engineering Research Vol. 1最新文献

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A Representation Scheme for Managing Complex Professional Knowledge 一种管理复杂专业知识的表示方案
Pub Date : 2021-02-18 DOI: 10.9734/BPI/AAER/V1/1506F
Chandra S. Amaravadi
A representation scheme called CKR-1 is introduced to deal with the challenges of representing complex knowledge.  Complex knowledge is defined as deep knowledge concerning a complex object, event, situation or process.  The nature of complex knowledge is identified from samples of professional knowledge drawn from the insurance industry.  These examples highlight efficacy of the scheme as well as its limitations.  CKR-1 is a type of semantic network that supports simple and abstract concepts, events, activities and situations.  It also supports several types of relationships including business, logical, causal, process etc.  It derives its expressivity from ability to support abstractions, elaborations, assertions and alternative points of view.  Usability was tested with a randomized selection of fifty knowledge items from a book for insurance professionals.  The scheme handled 39 of these well.  Despite this, the scheme suffers from limitations stemming from the inherent difficulty in expressing concepts involving several other vaguely defined abstract concepts.
介绍了一种称为CKR-1的表示方案来处理表示复杂知识的挑战。复杂知识被定义为关于复杂对象、事件、情况或过程的深度知识。复杂知识的性质是从保险行业抽取的专业知识样本中识别出来的。这些例子突出了该方案的有效性以及它的局限性。CKR-1是一种语义网络,支持简单和抽象的概念、事件、活动和情景。它还支持多种类型的关系,包括业务、逻辑、因果、过程等。它的表达能力来源于支持抽象、阐述、断言和可选观点的能力。可用性测试随机选择50个知识项目,从保险专业人员的书。该方案很好地处理了其中的39个问题。尽管如此,该方案受到一些固有困难的限制,这些困难来自于表达涉及其他几个模糊定义的抽象概念的概念。
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引用次数: 1
Effect of Boron Trioxide Enriched Fluxes on the Microstructure and Mechanical Properties in Submerged Arc Welded Mild Steel Plates 富三氧化二硼助熔剂对低碳钢埋弧焊板组织和力学性能的影响
Pub Date : 2021-02-18 DOI: 10.9734/BPI/AAER/V1/7077D
Pushpendra Gupta, J. Roy, S. C. Saha
Among the several arc welding methods, the submerged arc welding is the preferred method for welding thick sections in the industry because of its several advantages which include high production rates, good weld quality, ease of automation and minimum operator skill requirement. This paper represents a study on the effect of B2O3 additions in fluxes on the microstructure and mechanical properties of the weld metal formed during Submerged Arc Welding of Mild Steel plates. Five fluxes with about 2.5, 5, 7.5, 10 and 12.5% B2O3 were used with a low carbon electrode. Welding process parameters were kept constant for all the conditions. The microstructure of weld metal for each flux consisted mainly of acicular ferrite, polygonal ferrite, grain boundary ferrites and equiaxed pearlite. It was noted that Vicker’s hardness value was a function of boron content and showed a mixed trend. Impact Energy and Tensile Strength were increased with the increase in boron content in welds this can be attributed to relation with the higher acicular ferrite percentage. However, an optimum level of toughness and tensile strength was available with 7.5% and 5% of B2O3 respectively.  A qualitative comparison has also been made with fresh flux through full metallography and mechanically.
在多种电弧焊方法中,埋弧焊因其生产率高、焊接质量好、易于自动化和对操作人员技能要求低等优点而成为工业上焊接厚型材的首选方法。本文研究了助焊剂中添加B2O3对低碳钢埋弧焊焊缝金属组织和力学性能的影响。B2O3含量分别为2.5、5、7.5、10和12.5%的助焊剂分别用于低碳电极。在所有条件下,焊接工艺参数保持不变。各焊剂焊缝金属组织主要由针状铁素体、多边形铁素体、晶界铁素体和等轴珠光体组成。合金的维氏硬度值是硼含量的函数,呈混合趋势。冲击能和抗拉强度随焊缝中硼含量的增加而增加,这可归因于较高的针状铁素体百分比。然而,当B2O3含量为7.5%和5%时,合金的韧性和拉伸强度达到最佳水平。用全金相法和机械法对新熔剂进行了定性比较。
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引用次数: 0
Critical Study and Performance Improvement of the Drive Systems for a Class of Machine Tools 一类机床驱动系统的关键研究与性能改进
Pub Date : 2021-02-18 DOI: 10.9734/bpi/aaer/v1/7076d
M. Mikhov, M. Zhilevski
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引用次数: 0
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Advanced Aspects of Engineering Research Vol. 1
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