China’s rapid industrial development requires more energy consumption based on non-renewable resources. The caused by unnecessary friction accounts for about 4.5% of the GDP in China. Although grease effectively lubricates machines, lubrication failure may occur under severe conditions. Nanomaterials exhibit intriguing tribological performances and have received much attention regarding lubrica...

purpose: comparison of the results of visual evoked potential (vep) in time domain and frequency domain between multiple sclerosis (ms) suspected patients and normal indivisuals. method: eleven ms suspected patients with normal visual findings and 20 normal individuals were tested by vep. results were compared between two groups. results: the time domain results showed no significant difference...

it is well known fact that binary relations are generalized mathematical functions. contrary to functions from domain to range, binary relations may assign to each element of domain two or more elements of range. some basic operations on functions such as the inverse and composition are applicable to binary relations as well. depending on the domain or range or both are fuzzy value fuzzy set, i...

The presented work deals with the investigation of mechanical tribological properties on Inconel 625 superalloy, which is welded a 16Mo3 steel pipe. wall thickness basic pipe was 7 mm, while average layer 3.5 mm. coating made by cold metal transfer (CMT) method. A supercritical bending 180° performed material in this way cold. evaluated were hardness, wear resistance, coefficient friction (COF)...

finding a suitable estimation of stability domain around stable equilibrium points is an important issue in the study of nonlinear dynamical systems. this paper intends to apply a set of analytical-numerical methods to estimate the region of attraction for autonomous nonlinear systems. in mechanical and structural engineering, autonomous systems could be found in large deformation problems or c...

the magnetoresistance of a one-dimensional electron gas in a metallic ferromagnetic nanowire containing two atomic-size domain walls has been investigated in the presence of spin-orbit interaction. the magnetoresistance is calculated in the ballistic regime, within the landauer-büttiker formalism. it has been demonstrated that the conductance of a magnetic nanowire with double domain walls can ...

a time-domain approach is presented to calculate electromagnetic fields inside a large electromagnetic pulse (emp) simulator. this type of emp simulator is used for studying the effect of electromagnetic pulses on electrical apparatus in various structures such as vehicles, a reoplanes, etc. the simulator consists of three planar transmission lines. to solve the problem, we first model the meta...

background : rhoptries are unique secretory/excretory organelles that are found exclusively in the apicomplexa, and their contents are discharged at the time of invasion and are critical in the establishment of productive infection. several rhoptry proteins have been identified in toxoplasma gondii , plasmodium falciparum and neospora caninum and have been linked not only with the parasites’ ad...

L’élevage pastoral s’organise autour de la pratique du pâturage sur des surfaces végétations spontanées. Il revêt formes diverses fait plus ou moins grande importance part végétation spontanée dans l’alimentation troupeau, ce qui le conduit à être qualifié d’agropastoral. Les grands traits communs élevages pastoraux ont été identifiés et discutés avec les partenaires l’Unité Mixte Technologique...

Abstract Novel two-dimensional (2D) Nb 2 C nanosheets were successfully prepared through a simple lultrasonic and magnetic stirring treatment from the original accordion-like powder. To further study their water-lubrication properties deal with common oxidation problems, Nb2C different degrees achieved long-term stability in deionized water. Scanning electron microscope (SEM), transmission (TEM...