24 research outputs found
Testing Spontaneous Parity Violation at the LHC
We construct a supersymmetric SU(2)_L X SU(2)_R X U(1)_B-L model in which a
discrete symmetry (C-parity) implements strict left-right symmetry in the
scalar (Higgs) sector. Although two electroweak bidoublets are introduced to
accommodate the observed fermion masses and mixings, a natural missing partner
mechanism insures that a single pair of MSSM Higgs doublets survives below the
left-right symmetry breaking scale. If this scale happens to lie in the TeV
range, several new particles potentially much lighter than the SU(2)_R charged
gauge bosons W_R^+- will be accessible at the LHC.Comment: 12 pages, REVTex
Fermion Masses and Mixings in GUTs with Non-Canonical U(1)_Y
We discuss fermion masses and mixings in models derived from orbifold GUTs
such that gauge coupling unification is achieved without low energy
supersymmetry by utilizing a non-canonical U(1)_Y. A gauged U(1)_X flavor
symmetry plays an essential role, and the Green-Schwarz mechanism is invoked in
anomaly cancellations. Models containing vector-like particles with masses
close to M_{GUT} are also discussed.Comment: 18 page
Kaluza-Klein Excitations of W and Z at the LHC?
Deviations from standard electroweak physics arise in the framework of a
Randall-Sundrum model, with matter and gauge fields in the bulk and the Higgs
field localized on the TeV brane. We focus in particular on modifications
associated with the weak mixing angle. Comparison with the electroweak
precision data yields a rather stringent lower bound of about 10 TeV on the
masses of the lowest Kaluza-Klein excitation of the W and Z bosons. With some
optimistic assumptions the bound could be lowered to about 7 TeV.Comment: 11 pages, 5 figures, comments and references adde
Thermal treatment of wood using vegetable oils: a review
Wood is an ideal building material as it is renewable and green. However, low dimensional stability and durability might restrict its usage in structural application. Therefore, modification is needed to improve the aforementioned issues. As an environmentally friendly wood modification method, heat treatment of wood using oil as a heating medium has brought to researcher’s attention to the fact that it might serve as an excellent treatment procedure in treating wood. This paper presents a review about the effects of oil heat treatment on the properties of wood such as colour stability, dimensional stability, mechanical strength and durability against termites and fungi as well as its potential to be used as construction and building materials. The pros and cons of using oil as a heating medium in wood treatment are discussed. This review shows discrepancies between the treatment methods or procedures and its resultant findings. Moreover, the effectiveness of the treatment is governed by several factors such as the type of oils used and wood species. The objective of the present paper is to conduct a review of the published literatures regarding the properties of wood modified by oil heat treatment and the results obtained were compared systematically
Thermal treatment of wood using vegetable oils: a review
Wood is an ideal building material as it is renewable and green. However, low dimensional stability and durability might restrict its usage in structural application. Therefore, modification is needed to improve the aforementioned issues. As an environmentally friendly wood modification method, heat treatment of wood using oil as a heating medium has brought to researcher’s attention to the fact that it might serve as an excellent treatment procedure in treating wood. This paper presents a review about the effects of oil heat treatment on the properties of wood such as colour stability, dimensional stability, mechanical strength and durability against termites and fungi as well as its potential to be used as construction and building materials. The pros and cons of using oil as a heating medium in wood treatment are discussed. This review shows discrepancies between the treatment methods or procedures and its resultant findings. Moreover, the effectiveness of the treatment is governed by several factors such as the type of oils used and wood species. The objective of the present paper is to conduct a review of the published literatures regarding the properties of wood modified by oil heat treatment and the results obtained were compared systematically
Family Unification, Exotic States and Light Magnetic Monopoles
Models with fermions in bifundamental representations can lead naturally to
family unification as opposed to family replication. Such models typically
predict (exotic) color singlet states with fractional electric charge, and
magnetic monopoles with multiple Dirac charge. The exotics may be at the TeV
scale, and relatively light magnetic monopoles (greater than about 10^7 GeV)
can be present in the galaxy with abundance near the Parker bound. We focus on
three family SU(4)XSU(3)XSU(3) models.Comment: 37 page
SU(4)_C X SU(2)_L X SU(2)_R Models With C-parity
We construct supersymmetric SU(4)_C X SU(2)_L X SU(2)_R models with
spontaneously broken left-right symmetry (C-parity). The minimal supersymmetric
standard model (MSSM) can be recovered at low scales by exploiting the missing
partner mechanism. The field content is compatible with realistic fermion
masses and mixings, proton lifetime is close to or exceeds the current
experimental bounds, and supersymmetric hybrid inflation can be implemented to
take care of C-parity domain walls as well as magnetic monopoles, and to
realize the observed baryon asymmetry via non-thermal leptogenesis.Comment: 10 page
Thermal treatment of wood using vegetable oils:a review
Wood is an ideal building material as it is renewable and green. However, low dimensional stability and
durability might restrict its usage in structural application. Therefore, modification is needed to improve
the aforementioned issues. As an environmentally friendly wood modification method, heat treatment of
wood using oil as a heating medium has brought to researcher’s attention to the fact that it might serve as
an excellent treatment procedure in treating wood. This paper presents a review about the effects of oil
heat treatment on the properties of wood such as colour stability, dimensional stability, mechanical
strength and durability against termites and fungi as well as its potential to be used as construction
and building materials. The pros and cons of using oil as a heating medium in wood treatment are discussed.
This review shows discrepancies between the treatment methods or procedures and its resultant
findings. Moreover, the effectiveness of the treatment is governed by several factors such as the type of
oils used and wood species. The objective of the present paper is to conduct a review of the published
literatures regarding the properties of wood modified by oil heat treatment and the results obtained were
compared systematically
Low Energy Consequences of Five Dimensional SO(10)
We consider five dimensional (5D) supersymmetric SO(10) compactified on the
orbifold such that the SO(10) gauge symmetry is broken
on both fixed points (branes), and the residual gauge symmetry is
. We explore one example in
which the gauge symmetries on the two branes are respectively and , and the MSSM gauge symmetry
is recovered by the usual Higgs mechanism. We discuss how fermion masses and
mixings can be understood in this framework by introducing a flavor
symmetry. Unification of the MSSM gauge couplings and proton stability are also
considered. An order of magnitude increase in sensitivity could reveal proton
decay.Comment: 1+23 pages, 2 figures, comments added, version to appear in NP