Results 81 to 90 of about 2,167,580 (346)

Oriented matroids

Journal of Combinatorial Theory, Series B, 1978
AbstractIn this paper, the basic properties of oriented matroids are examined. A topological representation theorem for oriented matroids is proven, utilizing the notion of an “arrangement of pseudo-hemispheres”. The duality theorem of linear programming is extended to oriented matroids.
Folkman, Jon, Lawrence, Jim
openaire   +1 more source

Low‐Activation Compositionally Complex Alloys for Advanced Nuclear Applications—A Review

Advanced Engineering Materials, EarlyView.
Low‐activation compositionally complex alloys (LACCAs) are advanced metallic materials primarily composed of low‐activation elements, offering advantages such as rapid compliance with operational standards and safe recyclability. This review highlights their potential for extreme high‐temperature irradiation environments as structural materials for ...
Yangfan Wang, Hanliang Zhu, Zhiyang Wang, Zhijun Qiu, Xiao Wang, Zengxi Pan, Hongtao Zhu, Mingxing Zhang, Huijun Li   +8 more
wiley   +1 more source

Enhancing Corrosion Resistance and Mechanical Strength of 3D‐Printed Iron Polylactic Acid for Marine Applications via Laser Surface Texturing

Advanced Engineering Materials, EarlyView.
Laser surface texturing significantly improves the corrosion resistance and mechanical strength of 3D‐printed iron polylactic acid (Ir‐PLA) for marine applications. Optimal laser parameters reduce corrosion by 80% and enhance tensile strength by 25% and ductility by 15%.
Mohammad Rezayat, Mojtaba Karamimoghadam, Mohammadreza Lalegani Dezaki, Ali Zolfagharian, Giuseppe Casalino, Antonio Mateo, Mahdi Bodaghi   +6 more
wiley   +1 more source

Assessment and Comparing the Performance of Divested Firms to Non-governmental Public Sector and Private sector in Tehran Security Exchange after the Notification of the General Policies of Article 44 [PDF]

تحقیقات مالی اسلامی (پیوسته), 2012
This article tries to study the increase or decrease in the performance of the divested companies to the non-governmental public sector and the private sector compared to the period before the divestiture and then it tries compare the private sector and ...
Adel Azar, Ali Eslamjoo
doaj  

Multiscale Modeling of Process‐Induced Defects in Fused Filament Fabrication‐Printed Materials

Advanced Engineering Materials, EarlyView.
This study presents a predictive multiscale modeling tool for defect analysis of fused filament fabricated‐printed materials and their performance prediction using a mechanistic data science‐based reduced‐order modeling approach. Process‐induced defects are inherent to additively manufactured parts and significantly influence the performance of printed
Satyajit Mojumder, Derick Suarez, Trevor Abbott, Wing Kam Liu   +3 more
wiley   +1 more source

Direct Consolidation of Copper–Graphene Composite by Rotary Swaging

Advanced Engineering Materials, EarlyView.
The applicability of the rotary swaging method for preparation of electroconductive copper–graphene composite by direct consolidation of powders is proven. The consolidated material features advantageous microstructure featuring fine grains and twins, with homogeneous distribution of graphene, primarily along the twin boundaries, which contribute to ...
Radim Kocich, Lenka Kunčická, Pavel Czernek   +2 more
wiley   +1 more source

Effect of Water Aging on the Mechanical Properties of Hybrid Carbon/Aramid Reinforced Thermoplastic Composites

Advanced Engineering Materials, EarlyView.
This study investigates the mechanical properties of Carbon/Aramid intraply hybrid fiber‐reinforced Elium composites under 6 months of water aging. After aging, flexural strength decreases by 25.89%, tensile strength by 4.40%, and fracture toughness by 21.56%.
Muhammed Huseyin Guzel, Gurol Onal
wiley   +1 more source

Déterminants de la recrudescence de la malnutrition aigüe chez les enfants de 6 à 59 mois, étude menée dans la zone de santé rurale de Wanierukula/Tshopo, République Démocratique du Congo

Revue Congolaise des Sciences et Technologies
La malnutrition sous toutes ces formes continue de toucher plusieurs régions du monde en général, et particulièrement certains pays d’Afrique. En République démocratique du Congo, selon les données de la Direction Provinciale de la Santé de Tshopo ...
Faustin Ayubi Kesse, Steve Botomba Ntambwe, Marra Dourma, Gérard Eloko Eya Matangelo, Leyka Mukandu Basua Babintu   +4 more
doaj   +1 more source

On the orientation of graphs

Journal of Combinatorial Theory, Series B, 1980
AbstractLet G(V, E) be a finite, undirected graph, and let l(X) be a set function on 2V. When can the edges of G be oriented so that the indegree of every subset X is at least l(X)? A necessary and sufficient condition is given for the existence of such an orientation when l(X) is “convex”.
openaire   +3 more sources

3D‐Printed Architected Material for the Generation of Foam‐Based Protective Equipment

Advanced Engineering Materials, EarlyView.
This study investigates 3D‐printed architected structures as alternatives to traditional foams in protective gear. It focuses on customizing impact strength and damping through design and manufacturing integration. Testing shows these structures outperform conventional foams, offering enhanced customizability, lower weight, and tunable performance ...
Ali Zolfagharian, Gerard Bel Català, Daniel Saakes, Bernard Rolfe, Ian Gibson, Mehrshad Mehrpouya   +5 more
wiley   +1 more source