Behavior of Calcia-Stabilized Zirconia Coating at High Temperature, Deposited by Air Plasma Spraying System

Thermal barrier coatings (TBCs) are employed to protect metallic components from heat, oxidation, and corrosion in hostile environments. In this paper Ni-20Cr bond coat followed by CaZrO₃ top coat was deposited on 316 stainless steel substrates by air plasma spray coating technique. Isothermal treatment of coated samples was carried out to investigate the effect of heat exposure on the microstructure and metallurgical phase changes of TBCs system. The fractured surface of as-sprayed and delaminated CaZrO₃ coatings was also studied to observe the splats morphology, structural defects, and lamellas internal microstructure. CaZrO₃ coating was found to be stable for 100 h at 700 °C but accelerated degradation was observed at 900 °C even at 20 h and lead to delamination after 60 h of exposure time. Chromium rich oxide formation was found to be responsible for the complete delamination of the top coat. Further, the formation of meta-stable monoclinic phase was also observed on the top surface of the top coat.     

Angular velocity dynamics identification of small unmanned helicopter using fuzzy model

Attitude identification method for unmanned helicopter based on fuzzy model at hovering is presented.The dynamical attitude model is considered as basis for attitude control and it is very complex.To reduce the complexity of model,nonlinear model of unmanned helicopter with unknown parameters are to be determined by fuzzy system first and then derivative based gradient method is used to identify unknown parameters of model.Gradient method is used due to ability that fuzzy system is not necessarily to be linear in parameters,therefore all fuzzy sets for input and output can be adjusted.The validity of the proposed model was verified using experimental data obtained by the commercially available flight simulator X-Plane.The simulation results showed high accuracy of the modeling method and attitude dynamics data matched well with experimental data.     

Composition of the oil of asphodelus fistulosus (piazi) seeds

The seed oil ofAsphodelus fistulosus (piazi) contains 0.5% myristic, 5.7% palmitic, 3.6% stearic, 33.1% oleic, and 54.9% linoleic acids. The 1.8% nonsaponifiable matter appeared to contain fucosterol and a yellow, unidentified substance.     

Comparisons of good- and poor-cooking lentils

Good- and poor-cooking Canadian cultivars of lentils, CDC Richlea, Rose and Laird, were compared for shear force, seed phosphorus (P), phytic acid (PA), water uptake and for seed coat composition and structure. Good-cooking CDC Richlea and Rose lentils (shear force 4.9 kg g^?1) contained 24–33% more P and 48% more PA than poor-cooking lentils (shear force 7.0–8.1 kg g^?1). The poor-cooking CDC Richlea lentil (shear force 8.1 kg g^?1) had smaller hydration coefficients, solids lost, and water absorption than the good-cooking ientil (shear force 4.9 kg g^?1), but differences disappeared in dehulled good- and poor-cooking lentils of the same cultivar. Regression analysis showed that the good- and poor-cooking lentils absorbed water at the same rate. Therefore, smaller water-uptake was not responsible for the poor-cooking condition. Seed coat compositions of good- and poor-cooking Laird lentils were generally similar; the major components of the seed coats were cellulose and hemicellulose, forming about 56% of the non-starch polysaccharide and lignin fractions. Light microscopy of isolated seed coats showed a more tightly packed epidermis layer and a larger, thicker cell-walled hypodermis layer in the poor-cooking lentil than in the good-cooking lentil.     

Biosynthesis of silver nanoparticles using endophytic Fusarium oxysporum strain NFW16 and their in vitro antibacterial potential

Nanotechnology has provided a platform for altering, modifying, and developing metal properties to nanoparticles with promising applications. This study aimed to produce functionalized and biocompatible silver nanoparticles (AgNPs) using cellular extracts of endophytic Fusarium oxysporum-NFW16 isolated from Taxus fauna and evaluate its antibacterial potential. Under optimized reaction conditions, well-dispersed and extremely stable AgNPs were synthesized in 1 hr. AgNPs were characterized through UV–visible spectrophotometry (at 423 nm), and scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The obtained AgNPs were spherical, monodispersed, and size was ~30–36.1 nm. Strong peaks of XRD (311), (220), (200), and (111) matched to silver plane's diffraction facets. FTIR spectra at 1,650, 2,950, and 1,400 cm⁻¹ confirmed the capping of AgNPs with phenolic compounds and compounds having primary amines. The AgNPs showed 100 μg/ml of minimum inhibitory concentration against methicillin-resistant Staphylococcus aureus (MRSA). In addition, AgNPs showed a synergistic effect with both vancomycin and ciprofloxacin against MRSA (25%), Pseudomonas aeruginosa (50%), and pus isolated Escherichia coli (50%). Moreover, AgNPs impregnated cotton and bandage showed in vitro antibacterial potential against American Type Culture Collection and skin-associated clinical pathogenic bacteria. Findings showed that endophytic fungi are the potential source for AgNPs synthesis that are effective against multidrug-resistant bacteria and the development of antimicrobial textile finishes.