Hexacoordinated Co(III) complexes bearing three C,O-bidentate ligands (9a and 9b) were prepared from 1-bromo-2-(p-tolyloxymethyl)benzene (8a) and 1-bromo-2,6-bis(p-tolyloxymethyl)benzene (8b), respectively. Both complexes were stable in air at room temperature. X-ray analyses revealed that the structures of both complexes were essentially the same. According to variable temperature H NMR study,...

This paper presents both the dynamic modelling and study of variation certain physical parameters (pole area, gap base current) that change magnetic stiffness a radial heteropolar Rotor Magnetic Bearing (RMB) aiming at analysis magnitude its control current for three different equilibrium points. The RMB is modelled as fully uncoupled symmetric active 8-pole bearing. performed using spectral cu...

Combined magnetic bearing with radial and axial unites is an important supporting element for high speed energy density motor. Accurate calculation of the field a key to design optimise Radial Axial Magnetic Bearing (CRAMB). This study focuses on analytical method Unite CRAMB. The model based subdomain method. Laplace's equations in air-gap are solved by variable separation large diameter rotor...

The chemical variations of the essential oil from the aerial parts of Laurus nobilis L. (Lauraceae) have been studied. Plant material has been harvested at each phenological status (vegetative, before anthesis, full flowering and seed-bearing). The oils were obtained by hydrodistillation of the air-dried samples. Analysis by GC and GC-MS of the essential oils has allowed to identify 39 compound...

This theory sees the growth of mastoid as a response to its muscle bearing duties resulting in a separation of the inner and outer plates due to pull of Muscles. In the potential space thus formed air enters simply as a result of atmospheric communication via eustachian tube. Blockage of this middle ear communication before completion of pneumatisation will result in variations or loss of pneum...

There are many types of bearings available, each used for different purposes and different conditions. Two major types of bearings are contact bearings and noncontact bearings. By considering the ball material, I separate the contact bearings to steel bearings and ceramic ball bearings. On the other hand, there are bearings that can run without any contact between the sliding surfaces in the be...

An elevation in levels of circulating microparticles (MPs) due to high air pressure exposure and the associated inflammatory changes and vascular injury that occur with it may be due to oxidative stress. We hypothesized that these responses arise due to elevated partial pressures of N2 and not because of high-pressure O2. A comparison was made among high-pressure air, normoxic high-pressure N2,...

The newest advancement in the realm of bearing technology, Air Foil Bearings (AFB) is a marvel that allows for operation at both incredibly low and high temperatures without fail. Their minimalistic design eliminates requirement lubrication sealing systems, making them not only more efficient but also eco-friendly. When it comes to speed, these bearings give no quarter - they can handle even mo...

This paper presents the experimental research into high mechanical efficiency at thrust bearings of low-side scroll compressors for air conditioners with the new refrigerant R407C and Polyolester (POE) lubricant. In order to examine the friction loss at the thrust bearing under a test condition which is close to the actual running condition of compressors, the authors developed a friction test ...