Mechanical, Electrical and Thermal Properties of Nylon-66/Flyash Composites: Effect of Flyash

In the current study, the effect of flyash (FA) on the physic-mechanical, electrical, thermal and morphological behavior of nylon-66 (PA) was investigated. PA/FA composites were prepared by melt mixing via twin screw extruder, with varying weight percent (5 wt %, 10 wt %, 15 wt % and 20 wt %) of flyash. The results of composites were optimized and compared with virgin nylon-66. Mechanical and electrical properties of composites improved up to 10 wt% of FA loading without compromising the properties. The flyash filled nylon-66 composites showed a low abrasive wear rate. Increase the heat distortion temperature of composites with an increase in weight percent of flyash while opposing the melt flow rate. Flyash filler enhances the stiffness of plastics but significantly reduces the impact properties. Dispersion of flyash was examined by impact fracture surface of composites using a scanning electron microscope

Inappropriate patient sexual behavior in physiotherapy: A systematic review

A behavior which is increasing in prevalence is sexual harassment initiated by a client and displayed towards the healthcare professionals and students of these healthcare-related professions. This is termed inappropriate patient sexual behaviour (IPSB). The consequences of IPSB can be significant, including decreased academic and work performance, decreased attention/concentration, reductions in work satisfaction, and a loss of confidence. The primary aim is to evaluate the literature on sexual harassment in physiotherapy. The secondary aim is to report on the incidence, situational factors, and suggested strategies. The databases Pubmed, Ovid MEDLINE, CINAHL Plus, Embase via OVID, ProQuest, and EBM Reviews were searched from inception up to 5 November 2021. Data on the incidence, situations, and strategies were extracted by at least two independent researchers. The quality of included articles was assessed. Nine studies of cohort and cross-sectional design were included. The incidence of IPSB was reported to be between 48–100% of the samples of physiotherapy students and/or therapists. The situational factors are reported, and the recommended educational strategies are discussed. Articles suggest that educating physiotherapists and/or students about sexual harassment would be beneficial. This will help predict potential issues and highlight strategies to empower therapists in the workplace and in training. © 2021 by the authors. Licensee MDPI, Basel, Switzerland

A non-enzymatic amperometric hydrogen peroxide sensor based on iron nanoparticles decorated reduced graphene oxide nanocomposite

© 2016 Elsevier Inc. A simple and facile green process was used for the synthesis of iron nanoparticles (FeNPs) decorated reduced graphene oxide (rGO) nanocomposite by using Ipomoea pes-tigridis leaf extract as a reducing and stabilizing agent. The as-prepared rGO/FeNPs nanocomposite was characterized by transmission electron microscopy, X-ray spectroscopy and Fourier transform infrared spectroscopy. The nanocomposite was further modified on the glassy carbon electrode and used for non-enzymatic sensing of hydrogen peroxide (H2O2). Cyclic voltammetry results reveal that rGO/FeNPs nanocomposite has excellent electro-reduction behavior to H2O2 when compared to the response of FeNPs and rGO modified electrodes. Furthermore, the nanocomposite modified electrode shows 9 and 6 folds enhanced reduction current response to H2O2 than that of rGO and FeNPs modified electrodes. Amperometric method was further used to quantify the H2O2 using rGO/FeNPs nanocomposite, and the response was linear over the concentration ranging from 0.1 μM to 2.15 mM. The detection limit and sensitivity of the sensor were estimated as 0.056 μM and 0.2085 μA μM−1 cm−2, respectively. The fabricated sensor also utilized for detection of H2O2 in the presence of potentially active interfering species, and found high selectivity towards H2O2

The peculiar Type Ia supernova iPTF14atg: Chandrasekhar-mass explosion or violent merger?

iPTF14atg, a subluminous peculiar Type Ia supernova (SN Ia) similar to SN 2002es, is the first SN Ia for which a strong UV flash was observed in the early-time light curves. This has been interpreted as evidence for a single-degenerate (SD) progenitor system where such a signal is expected from interactions between the SN ejecta and the non-degenerate companion star. Here, we compare synthetic observables of multi-dimensional state-of-the-art explosion models for different progenitor scenarios to the light curves and spectra of iPTF14atg. From our models, we have difficulties explaining the spectral evolution of iPTF14atg within the SD progenitor channel. In contrast, we find that a violent merger of two carbon-oxygen white dwarfs with 0.9 and 0.76 M⊙, respectively, provides an excellent match to the spectral evolution of iPTF14atg from 10 d before to several weeks after maximum light. Our merger model does not naturally explain the initial UV flash of iPTF14atg. We discuss several possibilities like interactions of the SN ejecta with the circum-stellar medium and surface radioactivity from a He ignited merger that may be able to account for the early UV emission in violent merger models

Synthesis and characterization of N, N' -aliphatic dicarboxylbis-(hydrazones)

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New Energetic Epoxy Binders

A new class of epoxy resins having N-N bonds in the backbone has been synthesized with a view to explore their properties as energetic binders. The N-epoxidation of bis-dicarbonylhydrazones of adipic, azelaic and sebacic dihydrazides results in the formation of viscous resins having epoxide end groups. The resins have been characterized by the elemental and end group analyses, IR and NMR spectra. Relevant properties for their use as binders in solid propellants, such as thermal stability, heat of combustion, burn rate and performance parameters of AP-based propellant systems, have been evaluated. A significant increase in the burn rate of AP-based propellants noticed, is perhaps related to the exothermicity of the binder decomposition and the reactivity of N-N bonds with perchloric acid formed during the combustion of AP

Characterization of diglycidylamine epoxy resins based on bis-hydrazones

A series of hydrazones based viscous epoxy resins having N-N bonds in their backbones have been developed as energetic binders for composite solid propellants. A few typical resins have been characterized by their molecular weight distribution, $^{13}C$ NMR spectra and glass transition temperature. The gel permeation chromatography studies carried out show the composition profile in the glycidyl amine synthesis. Spectral studies confirm the epoxidation of the hydrazones. The cured dicarboxyl bishydrazone based resins have glass transition temperatures in the range −13 to $55^oC$