Modelling of material cutting with a material microstructure-level (MML) model

In this research work a material microstructure-level cutting model (MML cutting model) is presented. The crystal plasticity theory is adopted for modeling the cutting of the titanium alloy Ti–6Al–4V in orthogonal case. In this model, the grains of the studied material are explicitly presented, and their orientation angles and slip system strength anisotropy are considered as the main source of the microstructure heterogeneity in the cutting material. To obtain the material degradation process, the continuum self-consistent intragranular damage model and discrete cohesive zone inter-granular damage model, were developed, wherein the zero thickness cohesive element is implemented to simulate the bond between grain interfaces. This model was validated by a comparison with compression tests from literature. Results demonstrate the possibility to capture the influence of the microstructure on the material removal in terms of chip formation. Particularly, it is demonstrated that the grain orientation angle plays an important role for the chip segmentation and its periodicity during the cutting process

The Relationship Between Domain

The rights of Intellectual property are considered as moral rights. These rights, which come to non-material things, are the product of human thought and mind. They are developed and applied on the ground to become an intellectual product that may be material or moral. Among these ideas and innovations that has been emerged in recent years is Domain names. This term is often related to the domain of intellectual property in its branches. The reason for this is the novelty of this subject and its relevance to the field of information technology, in addition to the similarities that are associated with concepts of intellectual property such as trademarks and trade names. For example, more domain names in the field of intellectual property its disputes under the laws of similar elements such as the trademark. &nbsp

The Contribution of Domestic Investment, Exports and Imports on Economic Growth: A Case Study of Peru

This article has examined the contribution of domestic investment, exports and imports on economic growth in Peru. To achieve this objective, annual data for the period between 1970 and 2017 were used and tested based on Johansen co integration analysis and the vector error correction model. According to the results of the analysis, it has been determined that domestic investment, exports and imports have not any effect on economic growth in the short run and in the long run. These outcomes manifest that trade openness and domestic investments are not beholden as a provenance of economic growth in Peru over this extended period and suffer from many issues and a miserable economic organization

Bearing capacity of a strip footing on a geosynthetic reinforced soil modular block walls after a seismic loading

Geosynthetic reinforced walls are widely used in public works. The aim of this paper is to study the bearing capacity of a strip rough footing on a geosynthetic reinforced soil modular block walls, after a seismic action. The numerical modelling was carried out by using the finite element method implemented in the Plaxis code. The influence of the eccentric vertical load on the bearing capacity of footing was examined considering different distances between the top of the wall and the edge of the footing. The results of this study confirm that the seismic loading does not affect the bearing capacity when the distance d/B is greater than 10

The first record of the invasive Chinese pond mussel Sinanodonta woodiana (Lea, 1834) (Bivalvia: Unionidae) in the African continent

The Chinese pond mussel Sinanodonta woodiana s.l., is a successful global invader. We report its first finding in Morocco, which represents the first record of the species in the African continent. Measures are needed to increase monitoring and management of its invasion process

Random Walk Based Routing Protocol for Wireless Sensor Networks

International audienceIn recent years, design of wireless sensor networks using methodologies and mechanisms from other disciplines has gained popularity for addressing many networking aspects and providing more flexible and robust algorithms. We address in this paper the problem of random walk to model routing for data gathering in wireless sensor networks. While at first glance, this approach may seem to be overly simplistic and highly inefficient, many encouraging results that prove its comparability with other approaches have been obtained over the years. In this approach, a packet generated from a given sensor node performs a random motion until reaching a sink node where it is collected. The objective of this paper is to give an analytical model to evaluate the performance of the envisioned routing scheme with special attention to two metrics: the mean system data gathering delay and the induced spatial distribution of energy consumption. The main result shows that this approach achieves acceptable performance for applications without too stringent QoS requirements provided that the ratio of sink nodes over the total number of sensor nodes is carefully tuned

Biased Random Walk Model to estimate Routing Performance in Wireless Sensor Networks

International audienceLes réseaux de capteurs sans fils sont constitués d'un grand nombre de noeuds assujettis `à de sévères contraintes en terme d'énergie, de capacité de traitement et de communication. Dans ce contexte, afin de réduire la complexité, un des défis majeurs rencontrés dans ce type de réseau est le calcul des routes et la mise en oeuvre de schémas de routage efficaces tout en minimisant la quantité d'information utilisée sur l' état du système. De nombreux travaux ont ́etudié ce compromis de façon qualitative ou grâce à des simulations. Nous proposons un modèle basé sur la théorie de la marche aléatoire pour estimer analytiquement ce compromis en considérant plus particulièrement l'influence du degré de connaissance de l'état du système que posséde un noeud sur le temps moyen de collecte dans un réseau de capteurs sans fils