31,509 research outputs found
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PIM moulding of post consumer mixed plastics
Post consumer plastics from household are highly mixed and contaminated and are thus particularly difficult to recycle. Although advances in sorting and cleaning technologies for waste plastics have enable the relatively pure and clean streams such as bottles to be recycled, there is a increasing need for processing technologies that can utilise the low grade and mixed plastic residues from the plastics recovery facilities (PRF). In this work, potentials of utilisation of such feedstock in Powder Impression Moulding (PIM), a process capable of fabricating lightweight sandwich structures, are investigated in terms effects of loading and size of flakes from PE-rich mixed plastics in the formulations of the core on flexural properties of the sandwich panels. It was demonstrated that sandwich panels can be made by incorporating about 75 wt% of coarse flakes of a low-grade mixed plastics material directly obtained from a PRF
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Influences of impurities in recycled plastics on properties of PIM sandwich panels
Powder impression moulding (PIM) is a novel technology for manufacturing lightweight sandwich panels from plastics in powder form. The process is featured by its high tolerant to impurities or contaminants in the feedstock and thus requires much less materials segregation and cleaning operations when use recycled plastics. This paper investigate the influences of polymer impurities and soil contamination on structure and properties of PIM sandwich panels using compositions that simulate a PE-rich recycled plastic feedstock. It is demonstrated that the PIM process can accommodate considerable impurities (rPET residues or soil contamination) in a core dominated by LDPE/HDPE blendes. The variation of flexural properties can be predicted or controlled through monitoring of impurities. There exist significant scopes for reduction of the degree of sorting and cleaning in recycling systems by using lower grades of recyclates and for reduction of the associated costs and energy consumption
Sigma meson and lowest possible glueball candidate in an extended linear model
We formulate an extended linear model of a quarkonia nonet and a
tetraquark nonet as well as a complex iso-singlet (glueball) field to study the
low-lying scalar meson. Chiral symmetry and symmetry and their
breaking play important role to shape the scalar meson spectrum in our work.
Based on our study we will comment on what may be the mass of the lowest
possible scalar and pseudoscalar glueball states. We will also discuss on what
may be the nature of the sigma or meson.Comment: Contribution to the Proceedings of QCD@work 2012, Lecce, Italy, 18-21
June 2012, 5 pages, 2 figure
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Interface temperatures in friction braking
YesResults and analysis from investigations into the behaviour of the interfacial layer (Tribolayer)
at the friction interface of a brake friction pair (resin bonded composite friction material
and cast iron rotor) are presented in which the disc/pad interface temperature has been
measured using thermocouple methods. Using a designed experiment approach, the interface
temperature is shown to be affected by factors including the number of braking applications,
the friction coefficient, sliding speed, braking load and friction material. The time-dependent
nature of the Tribo-Iayer formation and the real contact area distribution are shown to be
causes of variation in interface temperatures in friction braking. The work extends the
scientific understanding of interface contact and temperature during friction braking
Highly Deformable Graphene Kirigami
Graphene's exceptional mechanical properties, including its highest-known
stiffness (1 TPa) and strength (100 GPa) have been exploited for various
structural applications. However, graphene is also known to be quite brittle,
with experimentally-measured tensile fracture strains that do not exceed a few
percent. In this work, we introduce the notion of graphene kirigami, where
concepts that have been used almost exclusively for macroscale structures are
applied to dramatically enhance the stretchability of both zigzag and armchair
graphene. Specifically, we show using classical molecular dynamics simulations
that the yield and fracture strains of graphene can be enhanced by about a
factor of three using kirigami as compared to standard monolayer graphene. This
enhanced ductility in graphene should open up interesting opportunities not
only mechanically, but also in coupling to graphene's electronic behavior.Comment: 5 pages, 7 figure
Quantum Phase Transitions beyond the Landau's Paradigm in Sp(4) Spin System
We propose quantum phase transitions beyond the Landau's paradigm of Sp(4)
spin Heisenberg models on the triangular and square lattices, motivated by the
exact Sp(4) SO(5) symmetry of spin-3/2 fermionic cold atomic system
with only wave scattering. On the triangular lattice, we study a phase
transition between the spin ordered phase and a
spin liquid phase, this phase transition is described by an O(8) sigma model in
terms of fractionalized spinon fields, with significant anomalous scaling
dimensions of spin order parameters. On the square lattice, we propose a
deconfined critical point between the Neel order and the VBS order, which is
described by the CP(3) model, and the monopole effect of the compact U(1) gauge
field is expected to be suppressed at the critical point.Comment: 6 pages, 3 figure
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