Some q-rung orthopair uncertain linguistic aggregation operators and their application to multiple attribute group decision making

q-Rung orthopair fuzzy sets (q-ROFSs), originally presented by Yager, are a powerful fuzzy information representation model, which generalize the classical intuitionistic fuzzy sets and Pythagorean fuzzy sets and provide more freedom and choice for decision makers (DMs) by allowing the sum of the $q\mathrm{t}\mathrm{h}$ power of the membership and the $q\mathrm{t}\mathrm{h}$ power of the nonmembership to be less than or equal to 1. In this paper, a new class of fuzzy sets called q-rung orthopair uncertain linguistic sets (q-ROULSs) based on the q-ROFSs and uncertain linguistic variables (ULVs) is proposed, and this can describe the qualitative assessment of DMs and provide them more freedom in reflecting their belief about allowable membership grades. On the basis of the proposed operational rules and comparison method of q-ROULSs, several q-rung orthopair uncertain linguistic aggregation operators are developed, including the q-rung orthopair uncertain linguistic weighted arithmetic average operator, the q-rung orthopair uncertain linguistic ordered weighted average operator, the q-rung orthopair uncertain linguistic hybrid weighted average operator, the q-rung orthopair uncertain linguistic weighted geometric average operator, the q-rung orthopair uncertain linguistic ordered weighted geometric operator, and the q-rung orthopair uncertain linguistic hybrid weighted geometric operator. Then, some desirable properties and special cases of these new operators are also investigated and studied, in particular, some existing intuitionistic fuzzy aggregation operators and Pythagorean fuzzy aggregation operators are proved to be special cases of these new operators. Furthermore, based on these proposed operators, we develop an approach to solve the multiple attribute group decision making problems, in which the evaluation information is expressed as q-rung orthopair ULVs. Finally, we provide several examples to illustrate the specific decision-making steps and explain the validity and feasibility of two methods by comparing with other methods.     

The analysis for morphological evolution and crystallography of degenerate pearlite in 100Mn13 steel

During approximate 773 K aging treatment of 100Mn13 steel, degenerate pearlite will occur and evolve into lamellar pearlite during growth process. The microstructures of degenerate pearlite and its evolutionary lamellar pearlite are observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that after 748 K, 773 K and 798 K aging, degenerate pearlites occur at grain boundary. At growth front of degenerate pearlite forming at 773 K and 798 K, pearlite presents a morphology of short lamellae of carbide and ferrite, indicating a trend of developing into lamellar pearlite. The higher the temperature is, the more obvious the trend is, and even a conventional lamellar pearlite has developed. However, there is no morphological evolution for degenerate pearlite forming at 748 K aging. Besides, the constituents of degenerate pearlite is identified as M₂₃C₆ and ferrite, and Kurdjumov-Sachs orientation relationship exists between them, (01 )_α//( 1 )_M23C6, [111]_α//[110]_M23C6. This orientation relationship maintains in morphological evolution from degenerate pearlite to lamellar pearlite.     

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通过现场实测研究，查明谢一矿深部巷道失稳破坏的主导因素是底臌，因而对巷道底臌的机理进行了分析，提出了防治底臌的综合技术措施，取得了较好的效果。     

工程塑料系列泵的设计及在矿山等行业的应用

介绍了可输送含颗粒介质的HTB型、大流量工程塑料泵的材质、水力模型、压制、轴封结构研制设计，及在矿山等行业中的应用。     

用计算机对地质结构面进行统计的算法

本文根据 Schmidt 网的一般制作原理,设计了一套既能在 Schmidt 网上统计出地质结构面的极点数,又能绘制出极点密度等值线图的算法和计算机程序。利用这套程序制作图件,不仅可成倍提高工效而且可以提高制图精度。由于该套程序是用 BASIC 语言编写,故操作使用方便,而且易于移植到 PC—1500或 PB—700这类微型计算机上去。     

大采深综采放顶煤条件下地表移动规律初探

本文通过对阳泉矿务局二矿地表移动观测站观测资料的分析研究 ,初步揭示了大采深综采放顶煤地表移动规律 ,为进行类似条件下的“三下”采煤奠定了基础。     

浅议煤矿井下漏电保护

通过对选择性漏电保护与两零序电流互感器的零序电流方向的漏电保护分析,说明两零电流互感器漏电保护更易判断保护范围内的漏电故障.