323 research outputs found
Razine cirkulirajuÄeg histamina i testovi pluÄne funkcije u radnika iz predionice pamuka
Circulating histamine level and forced expiratory volume in one second (FEY1) were measured by conventional methods in 39 selected workers (24 exposed and 15 controls) employed in a local cotton mill. There were 12 workers with byssinosis, who complained of breathlessness and tightness in the chest, showed elevated histamine concentrations in blood and a diminished percentage of predicted FEY1 values. Non-byssinotic subjects who were exposed to cotton dust had lower blood histamine concentrations and a higher percentage of predicted FEY1 values. Both exposed groups exhibited enhanced histamine levels and a lower percentage of predicted FEV1 values than unexposed subjects. The circulating histamine concentrations were negatively correlated with FEV1 among exposed workers.Razine cirkulirajuÄeg histamina i testovi pluÄne funkcije u radnika iz predionice pamuk
Phase transitions in neutron star and magnetars and their connection with high energetic bursts in astrophysics
The phase transition from normal hadronic matter to quark matter in neutron
stars (NS) could give rise to several interesting phenomena. Compact stars can
have such exotic states up to their surface (called strange stars (SS)) or they
can have quark core surrounded by hadronic matter, known as hybrid stars (HS).
As the state of matter of the resultant SS/HS is different from the initial
hadronic matter, their masses also differ. Therefore, such conversion leads to
huge energy release, sometimes of the order of ergs. In the present
work we study the qualitative energy released by such conversion. Recent
observations reveal huge surface magnetic field in certain stars, termed
magnetars. Such huge magnetic fields can modify the equations of state (EOS) of
the matter describing the star. Therefore, the mass of magnetars are different
from normal NS. The energy released during the conversion process from neutron
magnetar (NM) to strange magnetar/hybrid magnetar (SS/HS) is different from
normal NS to SS/HS conversion. In this work we calculate the energy release
during the phase transition in magnetars. The energy released during NS to
SS/HS conversion exceeds the energy released during NM to SM/HM conversion. The
energy released during the conversion of NS to SS is always of the order of
ergs. The amount of energy released during such conversion can only
be compared to the energy observed during the gamma ray bursts (GRB). The
energy liberated during NM to HM conversion is few times lesser, and is not
likely to power GRB at cosmological distances. However, the magnetars are more
likely to lose their energy from the magnetic poles and can produce giant
flares, which are usually associated with magnetars.Comment: 14 pages, 4 figures, 4 table
Global Search for New Physics with 2.0/fb at CDF
Data collected in Run II of the Fermilab Tevatron are searched for
indications of new electroweak-scale physics. Rather than focusing on
particular new physics scenarios, CDF data are analyzed for discrepancies with
the standard model prediction. A model-independent approach (Vista) considers
gross features of the data, and is sensitive to new large cross-section
physics. Further sensitivity to new physics is provided by two additional
algorithms: a Bump Hunter searches invariant mass distributions for "bumps"
that could indicate resonant production of new particles; and the Sleuth
procedure scans for data excesses at large summed transverse momentum. This
combined global search for new physics in 2.0/fb of ppbar collisions at
sqrt(s)=1.96 TeV reveals no indication of physics beyond the standard model.Comment: 8 pages, 7 figures. Final version which appeared in Physical Review D
Rapid Communication
Observation of Orbitally Excited B_s Mesons
We report the first observation of two narrow resonances consistent with
states of orbitally excited (L=1) B_s mesons using 1 fb^{-1} of ppbar
collisions at sqrt{s} = 1.96 TeV collected with the CDF II detector at the
Fermilab Tevatron. We use two-body decays into K^- and B^+ mesons reconstructed
as B^+ \to J/\psi K^+, J/\psi \to \mu^+ \mu^- or B^+ \to \bar{D}^0 \pi^+,
\bar{D}^0 \to K^+ \pi^-. We deduce the masses of the two states to be m(B_{s1})
= 5829.4 +- 0.7 MeV/c^2 and m(B_{s2}^*) = 5839.7 +- 0.7 MeV/c^2.Comment: Version accepted and published by Phys. Rev. Let
Nail lacquer filmsâ surface energies and in vitro water-resistance and adhesion do not predict their in vivo residence
The in vivo residence of nail lacquers (which are ideal topical drug carriers for the treatment of nail diseases) determines their frequency of application, and is thereby expected to influence patient adherence and success of treatment. Thus in vitro measurements to indicate lacquersâ in vivo residence are routinely conducted during formulation development. However the literature on in vitro-in vivo correlations is severely limited. Thus, the aim of the work discussed in this paper was to investigate correlations between in vivo residence and in vitro film resistance to water, in vitro film adhesion and surface energy of lacquer films. In vivo measurements were conducted on fingernails in six volunteers. Seven commercially available nail lacquers were tested in commonly-used measurements. Correlations between in vivo residence and in vitro water resistance and adhesion were found to be extremely poor. The surface energies of the lacquer films (which were between 33 and 39 mJ/m2) were also not predictive of in vivo residence. High density polyethylene (HDPE) sheet â whose surface energy was determined to be similar to that of the human nailplate â was found to be a suitable model for the nailplate (when investigating surface energy) and was used in a number of experiments
Acoustic Diagnostics of Electrical Origin Fault Modes with Readily Available Consumer-Grade Sensors
Acoustic diagnostics, traditionally associated with mechanical fault modes, can potentially solve a wider range of monitoring applications. Typically, fault modes are induced purposefully by the researcher through physical component damage whilst the system is shutdown. This paper presents low-cost real-time fault diagnostics of a previously unreported acute electrical origin fault that manifests sporadically during system operation with no triggering intervention. A suitability study into acoustic measurements from readily available consumer-grade sensors for low-cost real-time diagnostics of audible faults, and a brief overview of the theory and configuration of the wavelet packet transform (including optimal wavelet selection methods) and empirical mode decomposition processing algorithms is also included. The example electrical origin fault studied here is an unpredictable current instability arising with the PWM-controller of a BrushLess DC motor. Experimental trials positively detect 99.9 % of the 1160 resultant high-bandwidth torque transients using acoustic measurements from a USB microphone and a smartphone. While the use of acoustic techniques for detecting emerging electrical origin faults remains largely unexplored, the techniques demonstrated here can be readily adopted for the prevention of catastrophic failure of drive and power electronic components
Cianoacrilato na colagem de BrĂĄquetes ortodĂŽnticos em resina acrĂlica: hĂĄ maior adesĂŁo?
Pacientes em tratamento ortodĂŽntico apresentam restauraçÔes provisĂłrias com frequĂȘncia. No entanto, poucos estudos avaliam a influĂȘncia dos adesivos na resistĂȘncia ao cisalhamento dos brĂĄquetes nessas superfĂcies. A resina acrĂlica Ă© comumente indicada para colagem de brĂĄquetes, porĂ©m o uso do cianoacrilato como adesivo ortodĂŽntico Ă© uma opção analisada. O objetivo do presente trabalho foi avaliar o desempenho do cianoacrilato associado aos materiais comumente utilizados para a fixação de brĂĄquetes metĂĄlicos em restauraçÔes provisĂłrias de resina acrĂlica. Quarenta amostras em resina acrĂlica foram preparadas e as superfĂcies homogeinizadas com lixas de carboneto de silĂcio (320 e 600). Em seguida, as amostras foram divididas aleatoriamente em quatro grupos (n=10) com base no tratamento de superfĂcie e agente de uniĂŁo: G1 - brĂĄquetes colados com resina acrĂlica; G2 - brĂĄquetes colados com resina acrĂlica e aplicação de cianoacrilato; G3 - brĂĄquetes colados com Transbond(tm) XT; G4 - brĂĄquetes colados com Transbond(tm) XT e aplicação de cianoacrilato. Foram utilizados brĂĄquetes ortodĂŽnticos de aço inoxidĂĄvel, prescrição Roth, Kirium (3M/Abzil) para incisivos centrais superiores direitos, slot 022. ApĂłs colagem, as amostras foram submetidas ao teste de cisalhamento a uma velocidade de 0,5mm/min em uma mĂĄquina de ensaios universal (EMIC DL-1000). Os dados foram coletados e submetidos Ă anĂĄlise estatĂstica pelo teste ANOVA com nĂvel de significĂąncia de 5%. A associação de resina acrĂlica ao cianoacrilato (G2) resultou na maior resistĂȘncia ao cisalhamento (13,76 MPa), mas nĂŁo significativa em comparação aos valores obtidos para a resina acrĂlica (G1= 7,76 MPa). O mesmo pĂŽde ser observado para a associação Transbond(tm) XT e cianoacrilato (G4= 4,03 MPa) em relação a utilização da Transbond(tm) XT de forma isolada (G3= 3,87 MPa) e resina acrĂlica. O tratamento de superfĂcie tem efeito significativo na resistĂȘncia da uniĂŁo dos brĂĄquetes colados aos materiais provisĂłrios. A associação de cianoacrilato ao monĂŽmero de metilmetacrilato apresentou maior resistĂȘncia ao cisalhamento, sendo mais indicada clinicamente
Search for chargino-neutralino production in ppbar collisions at sqrt(s) = 1.96 TeV
We present the results of a search for associated production of the chargino
and neutralino supersymmetric particles using up to 1.1 fb-1 of integrated
luminosity collected by the CDF II experiment at the Tevatron ppbar collider at
a center-of-mass energy of 1.96 TeV. The search is conducted by analyzing
events with a large transverse momentum imbalance and either three charged
leptons or two charged leptons of the same electric charge. The numbers of
observed events are found to be consistent with standard model expectations.
Upper limits on the production cross section are derived in different
theoretical models. In one of these models a lower limit on the mass of the
chargino is set at 129 GeV/c^2 at the 95% confidence level.Comment: To be submitted to Phys.Rev.Let
Search for charged Higgs bosons in decays of top quarks in p-pbar collisions at sqrt(s) = 1.96 TeV
7 pages, 2 figuresWe report the recent charged Higgs search in top quark decays in 2.2/fb CDF data. This is the first attempt to search for charged Higgs using fully reconstructed mass assuming H->c-sbar in small tan beta region. No evidence of a charged Higgs is observed in the CDF data, hence 95% upper limits are placed at B(t->H+b)We report on the first direct search for charged Higgs bosons decaying into csÌ
in ttÌ
events produced by ppÌ
collisions at âs=1.96ââTeV. The search uses a data sample corresponding to an integrated luminosity of 2.2ââfb-1 collected by the CDF II detector at Fermilab and looks for a resonance in the invariant mass distribution of two jets in the lepton+jets sample of ttÌ
candidates. We observe no evidence of charged Higgs bosons in top quark decays. Hence, 95% upper limits on the top quark decay branching ratio are placed at B(tâH+b)< 0.1 to 0.3 for charged Higgs boson masses of 60 to 150ââGeV/c2 assuming B(H+âcsÌ
)=1.0. The upper limits on B(tâH+b) are also used as model-independent limits on the decay branching ratio of top quarks to generic scalar charged bosons beyond the standard model.Peer reviewe
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