1,123 research outputs found
Simultaneous Improvement in the Strength and Formability of Commercially Pure Titanium via Twinning-induced Crystallographic Texture Control
The rolling texture formed in the conventional cold rolling process of commercially pure titanium (CP-Ti) for producing a metal sheet significantly limits the potential applications of CP-Ti sheets in various industrial sectors by impairing the formability. Here, we report that by exploiting a twinning-induced crystallographic texture modification, the rolling texture can be weakened and dispersed effectively, leading to a simultaneous improvement in the formability and yield strength. A two-stage cold rolling process was designed with intermediate annealing at a late stage of the conventional cold rolling process to generate deformation twins. The intermediate annealing drove the activation of {11 (2) over bar2} twin and {11 (2) over bar2}-{10 (1) over bar2} double twin in the second stage of the rolling process by removing the internal reaction stress developed in the first stage of the rolling process through recrystallization, and the crystallographic feature of the {1122} twinned region, i.e., {11 (2) over bar2} twin texture, was effective for type slips and {10 (1) over bar2} twinning to accommodate a through-thickness strain as well as for reducing the planar anisotropy. This enhanced thinning capability and reduced planar anisotropy in the {11 (2) over bar2} twin texture led to an improvement of the formability. We demonstrated the feasibility of the suggested two-stage cold rolling process with ASTM grade 2 CP-Ti.11Ysciescopu
PIN69 Cost Utility Analysis of 13-Valent Pneumococcal Conjugate Vaccine in Malaysia
Farrando Sicilia, Jordi; Lecea, Ignasi de; Fuente Fuente, Carlos; Ribas Seix, Anna; Masana Padrós, Judit; Delgado, José L
Toadfish
24 p. : ill. ; 24 cm.Includes bibliographical references (p. 21-24)."Opsanus phobetron is described from the western Bahamas, Cuba, and the Isle of Pines. It was observed to nest in late December at Bimini, Bahamas. The black mouth functions as a warning mechanism, and under low albedo conditions, as at Bimini, the dark coloration is indicated to be of social significance. Attention is called to unidentified samples of Opsanus from Little Bahama Bank and the Gulf of Campeche. The ranges and recognition characters of O. pardus, O. tau, O. beta, and O. barbatus are discussed. Opsanus vandeuseni Fowler is referred to the synonymy of Opsanus beta (Goode and Bean). Opsanus hildebrandi Breder is placed in Marcgravia Jordan and appears not to be identical with M. ctyptocentra (Cuvier and Valenciennes). The low numbers of dorsal and anal rays attributed to Opsanus in the literature are valid if the Queensland genus Batrachoemus Ogilby is considered identical with Opsanus. Published paleotemperature measurements indicate that the 'tropical' Atlantic and Caribbean regions were not tropical during the last glacial period. The trans-Florida faunal province, now absent from southern Florida, was continuous around the southern tip of the Florida land mass; at the same time coral reefs were absent from most of the West Indies, and the shore fauna was predominantly temperate in the north and predominantly subtropical in the south. It is improbable that the Florida peninsula neck was submerged during Pleistocene interglacial periods. The presence of marine fishes in Florida fresh waters is not considered significant from the standpoint of historical zoogeography, and it is suggested that the elevated chlorinities in Florida fresh waters are maintained by current processes. Even if the neck of the Florida peninsula had been drowned, the Gulf of Mexico populations of trans-Florida fishes probably could not utilize the passage, as the temperatures would have been too high. The Gulf of Mexico disjunct trans-Florida populations are interpreted as glacial rather than interglacial relicts, and a comparison is drawn between the Gulf of Mexico and the Sea of Okhotsk. Because the spawning threshold temperature of Opsanus parallels the minimal thermal tolerance of reef corals, Opsanus is considered to be an 'indicator' of temperate coastal waters. Owing to thermal requirements and tolerances, Opsanus survives as a glacial relict in a few West Indian localities. During the last glacial period, the northern distributional limit for Opsanus may have been as far south as southern Florida. Opsanus, lacking pelagic life-history stages, could have dispersed through the West Indies by passive transport during storms"--P. 20-21
The rare top quark decays in the topcolor-assisted technicolor model
We consider the rare top quark decays in the framework of topcolor-assisted
technicolor (TC2) model. We find that the contributions of top-pions and
top-Higgs predicted by the TC2 model can enhance the SM branching ratios by as
much as 6-9 orders of magnitude. i.e., in the most case, the orders of
magnitude of branching ratios are , , . With the reasonable values of the
parameters in TC2 model, such rare top quark decays may be testable in the
future experiments. So, rare top quark decays provide us a unique way to test
TC2 model.Comment: 14 pages, 4 figure
A study of semi-inclusive charmless decays
We study semi-inclusive charmless decays in detail, such as
, , , where does not contain a charm (anti)quark. We find that
the process () can be particularly
useful for determination of the CKM matrix element . We calculate and
present the branching ratio (BR) of as a function of
, with an estimate of possible uncertainties. It is expected that the
BR is an order of . Our estimation indicates that one can
phenomenologically determine with reasonable accuracy by measuring
the BR of ().Comment: 18 pages, 7 figures; Revtex; version accepted for publication in Eur.
Phys. J.
New improved Moser-Trudinger inequalities and singular Liouville equations on compact surfaces
We consider a singular Liouville equation on a compact surface, arising from
the study of Chern-Simons vortices in a self dual regime. Using new improved
versions of the Moser-Trudinger inequalities (whose main feature is to be
scaling invariant) and a variational scheme, we prove new existence results.Comment: to appear in GAF
Higgs-Boson Production Associated with a Single Bottom Quark in Supersymmetric QCD
Due to the enhancement of the couplings between Higgs boson and bottom quarks
in the minimal sypersymmetric standard model (MSSM), the cross section of the
process pp(p\bar{p}) \to h^0b(h^0\bar{b})+X at hadron colliders can be
considerably enhanced. We investigated the production of Higgs boson associated
with a single high-p_T bottom quark via subprocess bg(\bar{b}g) \to
h^0b(h^0\bar{b}) at hadron colliders including the next-to-leading order (NLO)
QCD corrections in MSSM. We find that the NLO QCD correction in the MSSM
reaches 50%-70% at the LHC and 60%-85% at the Fermilab Tevatron in our chosen
parameter space.Comment: accepted by Phys. Rev.
R-parity violation effect on the top-quark pair production at linear colliders
We investigate in detail the effects of the R-parity lepton number violation
in the minimal supersymmetric standard model (MSSM) on the top-quark pair
production via both and collision modes at the linear
colliders. We find that with the present experimental constrained
parameters, the effect from interactions on the processes
and could be
significant and may reach -30% and several percent, respectively. Our results
show that the effects are sensitive to the c.m.s. energy and the
relevant parameters. However, they are not sensitive to squark and
slepton masses when (or ) and are almost independent on the Comment: Accepted by Phys.Rev.
Isometric Immersions and Compensated Compactness
A fundamental problem in differential geometry is to characterize intrinsic
metrics on a two-dimensional Riemannian manifold which can be
realized as isometric immersions into . This problem can be formulated as
initial and/or boundary value problems for a system of nonlinear partial
differential equations of mixed elliptic-hyperbolic type whose mathematical
theory is largely incomplete. In this paper, we develop a general approach,
which combines a fluid dynamic formulation of balance laws for the
Gauss-Codazzi system with a compensated compactness framework, to deal with the
initial and/or boundary value problems for isometric immersions in . The
compensated compactness framework formed here is a natural formulation to
ensure the weak continuity of the Gauss-Codazzi system for approximate
solutions, which yields the isometric realization of two-dimensional surfaces
in . As a first application of this approach, we study the isometric
immersion problem for two-dimensional Riemannian manifolds with strictly
negative Gauss curvature. We prove that there exists a isometric
immersion of the two-dimensional manifold in satisfying our prescribed
initial conditions. TComment: 25 pages, 6 figue
Pseudoscalar Higgs boson production associated with a single bottom quark at hadron colliders
We compute the complete next-to-leading order (NLO) SUSY-QCD corrections for
the associated production of a pseudoscalar Higgs boson with a bottom quark via
bottom-gluon fusion at the CERN Large Hadron Collider (LHC) and the Fermilab
Tevatron. We find that the NLO QCD correction in the MSSM reaches
at the LHC and at the Tevatron in our chosen parameter space
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