nowdays, production of high quality engine oils is one of the worries of our country’s engine oil industry. in this study, the behavior of four commercial polymers used in nation motor oil industry in obtaining the best viscosity index improver was investigated. in this regard, viscometric behavior, shear stability and polymers’ performance for engine cranking were compared at low temperature. ...

This research is supported by the tourim that attractive and develop well nowdays. We need to tourism be interested. One of place showes beautiful plantation, nature, education starfruit Starfruit. The problem objective are strategy, constraint, effort management faced during Covid-19 pandemic. study uses a qualitative approach while data taken from method observation, interviews, documentation...

nowdays,  iron  nanoparticles  due  to  their  unique  characteristics  are used  in  all  of  sciences  and  technology.  these  nano  particles  due  to their  electrical, magnetic,  optical  and  catalytic  properties  and  having high  area  and  activity  that  is  promped  by  their  small  size  and most importantly  many  scientists  from  the  entire  world  are  interested  in their  ...

Abstract Soil, is a reclamable and sustainable source. it is the basis of survival and it’s implication, should be performed on the basis of productivity identification according to scientific and technical rules, we can protect this valuable source, and increase it’s productivity and usage. Nowdays, saline soils cover nearly 14.6% of the country area. Study areas (Kashan’ playa) have saline ...

abstract soil, is a reclamable and sustainable source. it is the basis of survival and it’s implication, should be performed on the basis of productivity identification according to scientific and technical rules, we can protect this valuable source, and increase it’s productivity and usage. nowdays, saline soils cover nearly 14.6% of the country area. study areas (kashan’ playa) have saline an...

We use the exact scattering description of the scaling Ashkin-Teller model in two dimensions to compute the two-particle form factors of the relevant operators. These provide an approximation for the correlation functions whose accuracy is tested against exact sum rules. 1. The computation of correlation functions is a central and notoriously difficult problem of quantum field theory and statis...

In developing the network management systems often encountered a situation where there is a need to deal with malicious intrusion attempts aimed at obstructing the work. In this case, methods of management based on fluid models and a discrete controlled random walk model requires certain changes. In this work a generalization of the usual models of single server queue which can describe the att...

The transradial approach (TRA) for treatment of aortoiliac occlusive disease (AIOD) is nowdays a more common approach than several years ago. This is due to less post-procedural bleeding complications and its impact on mortality. The main reason for the growing interest in the TRA is because of the safety profile of this access. Peripheral arterial disease (PAD) is a growing phenomenon. It is a...

If you were to setup a new top-level domain (TLD), how many authoritative servers would you deploy? Figure 1 shows that most TLDs (∼ 50%) nowdays use 4 servers. Where would you deploy them (geographically)? And would you use anycast services (local on CDNs/ISPs, global elsewhere), unicast services or a combination of both? For existing TLDs, how can you optimize your authoritative servers setup...