Pair production of charged scalars and lepton flavor violating signals in the littlest Higgs model at e+e−e^{+}e^{-} colliders

In this work pair productions of charged and doubly charged scalars in the framework of littlest Higgs model at $e^+e^-$ colliders are studied. In the allowed parameter space of the littlest Higgs model, the production rates of the scalar pairs are calculated. It is obtained that pair productions of charged and doubly charged scalars are reachable at $e^+ e^-$ colliders with energy $\sqrt{S}\geq 1.7TeV$. Using the lepton flavor violating decays of charged scalars calculated in literature, final state analysis is done for pair production processes. This analysis show that depending on the model parameters, lepton number and lepton flavor violations can be observed free from any backgrounds.Comment: 8 pages, 4 figures, version in Nuc Phys

ZLZ_L associated pair production of charged Higgs bosons in the littlest Higgs model at e+e−e^{+}e^{-} colliders

The production of single and doubly charged Higgs bosons associated with standard model gauge boson $Z_L$ in $e^{+}e^{-}$ colliders are examined. The sensitivity of these processes on the littlest Higgs model parameters in the range of compatibility with electroweak precision observables are analyzed. The possibility of detecting lepton flavor violation processes are also discussed.Comment: 20 pages, 5 figures, version published in Physical Review

Contribution of Nanoclays to the Performance of Traditional Flame Retardants in ABS

The purpose of this study was to investigate contribution of nanoclays to the flame retardancy performance of a traditional brominated flame retardant compound with various combinations of antimony trioxide and zinc borate. The matrix polymer acrylonitrile butadiene styrene (ABS) was compounded by melt mixing in a laboratory size twin-screw extruder. X-ray diffraction analysis and transmission electron microscopy revealed that nanoclay silicate layers were mainly intercalated with certain level of exfoliation in ABS matrix. Flammability analysis investigated by mass loss calorimeter, limiting oxygen index, and UL-94 tests indicated that use of nanoclays improved all flame retardancy parameters significantly. For instance, the increase in the limiting oxygen index was up to 32% O-2, while the suppression in peak heat release rate value was as much as 82%, of course in each specimen the highest rating of V-0 in UL-94 test was obtained. Thermogravimetric and other residue analyses pointed out that these contributions were especially due to the condensed phase flame retardancy mechanism of nanoclay which contributes stronger and carbonaceous char formation acting as a barrier to heat and flammable gases and retarding volatilization via tortuous pathway. POLYM. COMPOS., 2012. (c) 2012 Society of Plastics Engineer

Use of zinc borate as the third component of a traditional brominated flame retardant system in acrylonitrile butadiene styrene

Because zinc borate is an effective smoke suppressant and cheaper than antimony trioxide, the main aim of this study was to investigate usability of zinc borate as the third component of a traditional binary Br/Sb2O3 system in acrylonitrile butadiene styrene. Limiting oxygen index, UL-94, and mass loss cone calorimeter studies indicated that almost all flame retardancy parameters were kept when certain percentages of antimony trioxide were replaced with zinc borate. Residue analysis revealed that the predominant flame retardancy mechanism of the traditional system was gas phase action, whereas zinc borate contributes especially in the condensed phase action by forming thicker and stronger char layer. Copyright (c) 2012 John Wiley & Sons, Ltd