In this paper, Fe-Cr-C-N-Al-Y wear-resistant surfacing alloy was prepared by open-arc with self-shielded flux-cored wire. The wear properties of the were analyzed using an MLS-23 rubber wheel wet sand tester. phase composition and microstructure X-ray diffraction, scanning electron microscope, backscatter diffraction transmission microscope; strengthening mechanism discussed. results show that ...

Introduction While the vast majority of clinical MRI sequences utilize Cartesian sampling strategies, in a growing number of applications nonCartesian schemes are being employed for a variety of technical reasons. For example, our own motivation is diffusion tensor imaging (DTI) wherein we use spiral trajectories [1], in part because they facilitate efficient self-navigation schemes for artifac...

tm is a program designed to test systems by simulating over-exaggerated use. The program can be used to check the accuracy of shared resources of a system or determine if a system will fail under intensive use. The simulation of users is done by threads running scripts. The configuration of tm and a description of the scripting language is included. A real test using tm is described and the res...

The sheer complexity of Web applications and inadequate approaches to analyze, design or update such projects generate incorrect environments, which are the source of potential risks. Poor applications reflect low availability, maintenance difficult and questionable efficiency in the services they provide. At present the quality assurances schemes still performed manually. A group of evaluators...

The martensitic transformation and the solidification structures of Mn49.3Ni43.7Sn7.0 alloy ribbons prepared by melt-spinning were investigated by means of scanning electron microscopy, X-ray diffraction and differential scanning calorimetry. In those experiments special attention was given to melt spinning processing parameters such as the linear surface speed of the copper wheel rotating, the...

Based on heavy aircraft main landing gear tires touchdown skidding process, patents have been registered since the 1940s to improve tire safety, decrease the substantial wear and smoke that results from every landing by spinning the rear wheels before touchdown. A single wheel has been modeled as a mass-spring-damper system using ANSYS mechanical transient simulation to analyze static and pre-r...

We describe a new architecture for passive robots and haptic displays, which we call a programmable constraint machine (PCM). An n-dof PCM can, under computer control, exhibit constraints (smooth, impenetrable virtual surfaces of dimensionality < n), or it can allow free n-dof motion. At the heart of the PCM is a nonholonomic element, which is used as a continuously variable transmission (CVT)....

In this study we present a technique for testing robustness of Real-time systems described as Component-Based System having timing constraints. Each component is modeled as a Timed Input-Output Automaton (TIOA). For robustness issue, we handle two specifications : a nominal one (the more detailed specification) and a degraded one (considering only vitale functionnalities). We derive test sequen...

This study tested the generalizability of the consistency effect to real-world settings. The consistency effect refers to the finding that items inconsistent with expectations are better recalled and recognized than items consistent with expectations. In two experiments, subjects walked into a graduate student's office or a preschool classroom. Half of the items in each setting were consistent ...

Typical rovers with wheels equipped with conventional grousers are prone to getting stuck in unconsolidated sandy dune inclines as the wheels tend to sink into the sand. This phenomenon is caused by the motion of the grouser through the sand during the latter half of the rotation, in which the grouser pushes the sand from underneath the wheel upwards and towards the backside of the wheel. This ...