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Generalized Multiobjective Symmetric d.a.ity under Second-Order(F, α, ρ, d)-Convexity

Acta Mathematicae Applicatae Sinica 2015年第2期31卷 529-542页

作者： S.K.Gupta d.dangar department of Mathematics Indian Institute of Technology Roorkee department of Mathematics and Humanities IT Nirma University

In this paper, we first formulate a second-order multiobjective symmetric primal-d.a. pair over arbitrary cones by introducing two different functions f ： R^n × R^m → Rk and g ： R^n × R^m → R^l in each k-objectives as well as l-constraints. Further, appropriate d.a.ity relations are established under second-order（F, α, ρ, d）-convexity assumptions. A nontrivial example which is second-order（F, α, ρ, d）-convex but not secondorder convex/F-convex is also illustrated. Moreover, a second-order minimax mixed integer d.a. programs is formulated.a.d.a.d.a.ity theorem is established using second-order（F, α, ρ, d）-convexity assumptions. A self d.a.ity theorem is also obtained by assuming the functions involved to be skew-symmetric.

关键词： multiobjective symmetric d.a.ity second-order(F α ρ d)-convex d.a.ity theorems minimax self d.a.ity

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激素和代谢控制

激素和代谢控制

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作者： d.a.·怀特(d.a. White)等

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Machine learning assisted design of shape-programmable 3d kirigami metamaterials

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npj Computational Materials 2022年第1期8卷 1817-1828页

作者： Nicolas A.Alderete Nibir Pathak Horacio d.Espinosa Theoretical and.a.plied Mechanics Northwestern UniversityEvanstonIL60208USA department of Mechanical Engineering Northwestern UniversityEvanstonIL60208USA

Kirigami-engineering has become an avenue for realizing multifunctional metamaterials that tap into the instability landscape of planar surfaces embedded with ***,it has been shown that two-dimensional Kirigami motifs can unfurl a rich space of out-of-plane deformations,which are programmable and controllable across spatial *** Kirigami’s versatility,arriving at a cut layout that yields the desired functionality remains a ***,we introduce a comprehensive machine learning framework to shed light on the Kirigami design space and to rationally guide the design and control of Kirigami-based materials from the meta-atom to the metamaterial *** employ a combination of clustering,tandem neural networks,and symbolic regression analyses to obtain Kirigami that fulfills specific design constraints and inform on their control and *** systematic approach is experimentally demonstrated by examining a variety of applications at different hierarchical levels,effectively providing a tool for the discovery of shape-shifting Kirigami metamaterials.

关键词： shape hierarchical shifting

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Increase of Operational Properties of Multilayered Welded from Alloyed Steel 30XΓCA

Increase of Operational Properties of Multilayered Welded fr...

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The Fourth International Conference on Physical and Numerical Simulation of Materials (ICPNS’2004)

作者： Saraev Yu.N. Chinahov d.a. Fedko V.T. Institute of physics of durability and materiology of the Siberian Branch of the Russian Academy of Science 634021 Russia Tomsk prospect Academichesky 2/1. Branches TPU 652000 Russia the Kemerovo region Yurga street Leningradskaya 26t Branches TPU 652000 Russia the Kemerovo region Yurga street Leningradskaya 26

＜正＞One of the important problems of modem manufacture is improvement of technical and economic parameters of welded designs on the basis of reduction in their specific metal consumption, increase in operational reliability and durability. High-strength alloyed steels with a liquid limit 550…950 MPa （30XΓCA, 12X2HhA. etc.） possess a high complex of operational properties and.a.e used for manufacture of crucial welded products. They provide high durability of design at simultaneous reduction in its metal *** main difficulty at welding these steels is prevention of formation of cold cracks in metal of a seam and zone of thermal influence. Solving this problem becomes complicated because welded connections should possess required operational properties in after welding condition without more heat *** resource-saving technology of welding of multilayered connections with slot-hole cutting from steel 30XΓCA by a stationary arch in conditions of two-jet gas protection in CO2, without preheating and subsequent heat treatment is developed. The multilayered welded connections received by developed technology possess high enough and stable operational *** carried out microstructural analysis of samples has shown presence of fine-dyspersated structures of metal in seams with implicitly expressed welded zone, i.e. there is a smooth transition from metal of a seam to the basic metal that provides high serviceability of welded connection. It is proved by a high value of impact strength of samples with a cut in zone of thermal *** preheating and subsequent heat treatment from technological process of welding of multilayered welded connections of steel 30XΓCA allows to save 3-4 m3/h of combustible gas （acetylene, natural gas） and 3-4,5 m3/h of oxygen necessary at local heating of welded products. The economy of gas and oxygen at welding one running metre of multilayered welded connection makes 14,58 roubles in the prices of 2002. du

关键词： Operational properties Multilayered weld

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原子吸收、原子荧光和火焰发射光谱法

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光谱实验室 1990年第Z2期7卷 112-151页

作者： J.A.霍尔库姆 d.a.巴斯李报厚奥斯汀特克萨斯大学化学系中国科学院化工冶金研究所

在两年的时期之末,编写这评论文之前,当阅读完两千多篇文章时,可以用"阿丽丝漫游奇境记"一书中的一句话来抒发感受:"你了解得并不多,而这是事实"。在过去的两年间,发表了一些文章,它们解决

关键词：火焰原子荧光原子吸收改进剂 FAAS 发射光谱法原子化机理电热原子化器

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Effects of deep cryogenic treatment on mechanical and tribological properties of AISI d3 tool steel

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Friction 2015年第3期3卷 234-242页

作者： Nay Win KHUN Erjia LIU Adrian Wei Yee TAN d.SENTHILKUMAR Bensely ALBERT d.MOHAN LAL School of Mechanical and.a.rospace Engineering Nanyang Technological University 50 Nanyang AvenueSingapore 639798Singapore department of Mechanical Engineering P.A.College of Engineering and TechnologyPollachi 642002TNIndia QuEST Global Services-NA Inc.GreenvilleSC 29615USA department of Mechanical Engineering College of EngineeringGuindyAnna University Chennai 600025India

In this study,the effects of deep cryogenic treatment(dCT)on the mechanical and tribological properties of AISI d3 tool steel were investigated together with a systematic correlation between their hardness and wear *** was found that conventionally heat treated.a.SI d3 tool steel samples were significantly hardened via an additional dCT,which was attributed to the more retained.a.stenite elimination,more homogenized carbide distribution and more reduction in carbide size in the *** a result,the hardened.a.SI d3 samples exhibited reductions in their friction and wear during rubbing against alumina and 100Cr6 steel balls under different normal loads due to the effectively hindered removal of surface *** results clearly showed that the dCT was an effective way to improve the mechanical and tribological properties of the AISI d3 tool steel samples as the tribological performance of the tool steel samples was significantly influenced by their hardness.

关键词： AISI d3 tool steel deep cryogenic treatment hardness friction wear

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