In this paper, ANSYS finite element software is used to analyze the finite element analysis of four different members with different height-diameter ratio. The influence of height ratio on the ultimate bearing capacity of GFRPdouble concrete-filled steel tubular columns is investigated. The results show that the ultimate bearing capacity of the specimen decreases with the increase of slenderness ratio, and the variation range of bearing capacity is different in different slenderness interval.

In this paper, ANSYS finite element software was used, and the 3 kinds of reinforcement ratio of the specimens were analyzed by finite element method. The effect of reinforcement ratio on the mechanical properties of GFRP cloth reinforced concrete columns under axial compression was studied. The results showed that the ultimate compressive strength of reinforced concrete columns confined by GFRP cloth was improved with the increase of reinforcement ratio, and the size effect of GFRP steel bar was slightly improved.

Drilling fluid -mud - is usually composed by water, clay, weighing material and a few chemicals. The drilling fluids are applied extensively in the upstream oil and gas industry, and are critical to ensuring a safe and productive oil or gas well. During drilling process, a large volume of drilling fluid is circulated in an open or semi enclosed system, at elevated temperatures, with agitation, preparing an important potential for chemical exposure and subsequent health effects. The role of the mud engineer or more properly Drilling Fluids Engineer is very critical to the entire drilling operation because even small problems with mud can stop the whole operations on rig.

The performance assessment of nano ferric oxide and mixtures of it (10 and 15 gr/lit) which contain mineral coagulants (5 and 10 mg/lit for evaluation of acidity of wastewater and 15 and 20 mg/lit for measuring of zeta potential) as auxiliary coagulants in pre-treatment of drilling waste water was considered, in this pilot scale experimental work. Major parameters in coagulation and flocculation such as initial and final pH, zeta potential and resident time were evaluated in two pre-treatment reactors.

The ground breaking impact of VoIP or IP Telephony in contemporary society‟s telecommunication is monumental, colossal, abysmal, enormous and massive. This work presents controversies, issues, and problems bordering on the deployment and management of voice over internet protocol (VoIP) quality of service (QoS) over wireless local area network (WLAN) and suggests very significant ways of addressing such issues. The methodology used in this work is quantitative. Review of related work was conducted through evaluation of scholarly works (books, journals, articles, etc.), of scholars in telecommunication VoIP raises a number of new possibilities to explore the telecommunication world. This exploration only requires a willingness to entertain new paradigms in telecommunication. Our commitment to growth in the telecommunication industry demands that we take this journey. Our homes and our businesses deserve nothing less.

Antifungal properties of ozone (O3) gas were evaluated in stored naturally contaminated dry maize grains. An experimental design was applied at three concentrations (20, 40, 60 μmol/mol) and different exposure times (30 to 180 min) for Groups I to III, respectively. O3 gas had evaluated its antifungal efficiency at Day zero and after 30 days of storage, at the lower and upper layers of each silo. Regarding O3 concentration, it was observed with the increase of its concentration (from 20 to 60 µmol/mol) a decrease of 2.5x10(16.2%) and 0.5x10(3.2%) CFU/g in the silo upper and the lower layers, respectively. On the other hand, regarding O3 time of exposure, when the ozonation time increased (from 30 to 180 min) on contaminant mycoflora there was a total fungi load decrease of 1.0x10(6.5%) and 0.5x10(3.2%) CFU/g in the upper and lower layers, respectively exposed to O3 gas. The response surface presented the maximum of 94.5% of spores inhibition. After 30 days of storage no statistical difference was observed between the applied treatments. Therefore, both treatments were effective. It was observed at Control silo (no gas treatment) at day 30th a total fungi load of 22x10 CFU/g.

A given work proposes a method of balanced shared explicit reservation for multicast routing in communication network. A mathematical model for multicast routing supporting shared explicit reservation of link resource was presented, which is introduced by linear expressions that are responsible for ensuring the connectivity of the calculated multicast routes, as well as the absence of loops in them. The analysis of the solutions for the multicast routing tasks and the shared explicit reservation of network resources using the proposed model for different network structures, flow characteristics and the used optimality criteria is conducted. The use of the proposed model ensured the improvement of the obtained results on average by 45-65% compared to the distributed (uncoordinated) solution of multicast routing tasks and reservation of link resources used in modern network protocols. According on the results of the conducted studies it is recommended to implement the complex optimality criterion, the use of which is most effective from the point of view of both balanced use of the network resource and in terms of ensuring the maximum productivity of the network as a whole.