Study of dynamic loads dependence on aircraft engine mount variant after fan blade-out event

A turbofan nonlinear dynamic model is described in the paper. It has been developed for the computation of loads in the engine frame after fan blade-out (FBO) event. The model includes reduced dynamic finite element models of rotors and casings and also nonlinear elements for simulation of “rotor-casing” contact interactions. Thorough attention has been paid to mounts modeling with possible mechanisms taken into account. The engine dynamic behavior during its rotors deceleration to the autorotation mode after the FBO event has been simulated for the following two forward mount arrangement variants: fastening to the inner part of the intermediate casing; fastening to the outer part of the intermediate casing. The effect of load reduction device (LRD) – special elements which are introduced to fan supports, destroyed under certain force and don’t transfer improper loads to the engine casing system after the FBO event, has been studied. The analysis of maximum loads on engine mounts has been performed for the two listed design variants for both cases: with and without an LRD in fan supports

How the online environment can facilitate or hinder Creative Problem Solving process among international students, and how this environment help the recognition of a creative person in international business environment?

This qualitative study investigates how different factors such as cultural and educational backgrounds, timeframes, mood factor, team-bonding, team trust, levels of language and engagement, as well as task and relationship conflicts affect creative problem solving (CPS) processes in two opposing environments: ‘online’ and ‘offline’. Ten respondents from seven different countries were gathered, in order to provide multicultural diversity, for the purpose of this study. They were divided into two groups chosen at random to go through a CPS ‘online’ process. After that, ten semi-structured interviews were conducted with each participant and analyzed. In addition, one more factor was added to the interview protocol: personal estimation of the creative individual, to establish views on how an individual assesses him or herself in a creative group collaboration. Finally, interesting correlations were found between the different factors and two environments. They were discussed, in order to provide a deeper insight for further research and organizational implementations

Djelovanje dodataka arome u kunića

The 45d experiment was conducted to study the effect of aroma supplementation to the diets on growth performance, feed efficiency and carcass characteristics of fattening New Zealand White rabbits. There were two treatment groups: one without a supplement and the other with 0.03% aroma TIMIKO. The body weight gain, feed intake and utilization, and carcass characteristics were determined. Rabbits fed the aroma diet grew faster (P<0.001) than the rabbits fed the control diet (37.3 v/s 34.0 g, respectively). TIMIKO addition increased average daily feed intake by 7.5% (144 v/s 134 g, respectively) and improved feed conversion ratio by 4.0%. No differences in dressing percentage were abserved.Pokus 45d obavljen je radi proučavanja djelovanja doda¬tka arome u obroke na rast, djelotvornost hrane i značajke tov¬ljenja novozelandskih bijelih kunića. Bile su dvije skupine: jedna bez dodatka i jedna s dodatkom 0,03% arome TIMIKO. Određeni su prirast težine, unos i iskorištenost hrane te značajke polovica. Kunići hranjeni obrocima s aromom rasli su brže (P < 0.001) nego kunići u kontrolnoj skupini (37,3 odnosno 34,0 g). Dodavanje TIMIKO-a povećalo je prosječan dnevni unos hrane za 7,5% (144 prema 134 g) i poboljšalo omjer konverzije hrane za 4.0%. Nisu primije¬ćene razlike u postotku randmana

Formation of single crystalline ZnO nanotubes without catalysts and templates

Oxide and nitride nanotubes have gained attention for their large surface areas, wide energy band gaps, and hydrophilic natures for various innovative applications. These nanotubeswere either grown by templates or multistep processes with uncontrollable crystallinity. Here the authors show that single crystal ZnO nanotubes can be directly grown on planar substrates without using catalysts and templates. These results are guided by the theory of nucleation and the vapor-solid crystal growth mechanism, which is applicable for transforming other nanowires or nanorods into nanotubular structures

The impact of tomato fruits containing multi-walled carbon nanotube residues on human intestinal epithelial cell barrier function and intestinal microbiome composition

Carbon nanomaterials (CNMs) can positively regulate seed germination and enhance plant growth. However, clarification of the impact of plant organs containing absorbed CNMs on animal and human health is a critical step of risk assessment for new nano-agro-technology. In this study, we have taken a comprehensive approach to studying the effect tomato fruits derived from plants exposed to multiwalled carbon nanotubes (CNTs) have on gastrointestinal epithelial barrier integrity and their impact on the human commensal intestinal microbiota using an in vitro cell culture and batch human fecal suspension models. The effects of CNTs on selected pure cultures of Salmonella enterica Typhimurium and Lactobacillus acidophilus were also evaluated. This study demonstrated that CNT-containing fruits or the corresponding residual level of pure CNTs (0.001 mu g ml(-1)) was not sufficient to initiate a significant change in transepithelial resistance and on gene expression of the model T-84 human intestinal epithelial cells. However, at 10 mu g ml(-1) concentration CNTs were able to penetrate the cell membrane and change the gene expression profile of exposed cells. Moreover, extracts from CNT-containing fruits had minimal to no effect on human intestinal microbiota as revealed by culture-based analysis and 16S rRNA sequencing

Optimization of parameters of boom lifting mechanism of equipment for repair and development of oil and gas wells

The paper discusses the procedure for calculating the optimal parameters of the boom lifting mechanism for the repair and development of oil and gas wells. Based on the results of the calculation method, graphs were built. A graph of the force developed by the drive versus the boom elevation angle and a graph of the force versus the boom attachment angle is plotted. The results are presented to determine the optimal parameters of the boom lifting mechanism using this method