Investigació
http://hdl.handle.net/10550/53
Wed, 22 Oct 2014 03:14:21 GMT2014-10-22T03:14:21ZEffects of Kinesiotape taping on plantar pressure and impact acceleration during walking
http://hdl.handle.net/10550/39267
Effects of Kinesiotape taping on plantar pressure and impact acceleration during walking
Perez-Soriano, P.; Lucas-Cuevas, A.G.; Aparicio-Aparicio, I.; Llana-Belloch, S.
Objectives: The aim of this study was to analyse the plantar pressure pattern, contact time, stride rate and impact acceleration in the shank during walking with and without Kinesio Tape (KT®) placed on two muscle groups: Peroneus and Triceps surae. Methods: 29 subjects (12 men, 17 women) participated in the study. KT® was placed on the triceps surae and peroneus and participants walked at two different speeds (V1: 0.73 m/s; V2:1.30 m/s) with and without KT®. The pedobarographic system Biofoot IBV® 6.0 was used to analyse plantar pressure (mean peak pressure [kPa]) in 5 foot areas and the kinematic variables of the study (contact time [s]; stride rate [steps/min]). One uni-axial accelerometer (Sportmetrics®) was placed on the shank for the impact loading analysis. Results: No significant difference was observed on plantar pressure (p>0.05), and kinematics variables (p>0.05) between the KT® and noKT® conditions. However, results revealed a relationship of dependence between speed and plantar pressure and kinematics parameters, especially under the rearfoot and the medial part of the foot (p<0.005). Conclusion: The results suggest that application of KT® on peroneus and triceps surae does not have a direct effect on the kinematic pattern of healthy individuals during walking.
Tue, 31 Dec 2013 23:00:00 GMThttp://hdl.handle.net/10550/392672013-12-31T23:00:00ZCombined nonrelativistic constituent quark model and heavy quark effective theory study of semileptonic decays of Lambda(b) and Xi(b) baryons
http://hdl.handle.net/10550/39266
Combined nonrelativistic constituent quark model and heavy quark effective theory study of semileptonic decays of Lambda(b) and Xi(b) baryons
Albertus, Conrado; Hernández Gajate, Eliecer; Nieves Pamplona, Juan Miguel
We present the results of a nonrelativistic constituent quark model study of the semileptonic decays Lambda(b)(0)-->Lambda(c)(+)l(-)(ν) over bar (l) and Xi(b)(0)-->Xi(c)(+)l(-)(ν) over bar (l) (l=e,mu). We work on coordinate space, with baryon wave functions recently obtained from a variational approach based on heavy quark symmetry. We develop a novel expansion of the electroweak current operator, which supplemented with heavy quark effective theory constraints, allows us to predict the baryon form factors and the decay distributions for all q(2) (or equivalently w) values accessible in the physical decays. Our results for the partially integrated longitudinal and transverse decay widths, in the vicinity of the w=1 point, are in excellent agreement with lattice calculations. Comparison of our integrated Lambda(b)-decay width to experiment allows us to extract the V-cb Cabbibo-Kobayashi-Maskawa matrix element for which we obtain a value of \V-cb\=0.040+/-0.005(stat)(-0.002)(+0.001)(theory) also in excellent agreement with a recent determination by the DELPHI Collaboration from the exclusive (B) over bar (0)(d)-->D(*+)l(-)(ν) over bar (l) decay. Besides for the Lambda(b)(Xi(b))-decay, the longitudinal and transverse asymmetries and the longitudinal to transverse decay ratio are <a(L)>=-0.954+/-0.001(-0.945+/-0.002), <a(T)>=-0.665+/-0.002(-0.628+/-0.004), and R-L/T=1.63+/-0.02(1.53+/-0.04), respectively.
Fri, 31 Dec 2004 23:00:00 GMThttp://hdl.handle.net/10550/392662004-12-31T23:00:00ZA heavy quark symmetry approach to baryons
http://hdl.handle.net/10550/39265
A heavy quark symmetry approach to baryons
Albertus, Conrado; Amaro Soriano, José Enrique; Hernández Gajate, Eliecer; Nieves Pamplona, Juan Miguel
We evaluate different properties of baryons with a heavy c or b quark. The use of Heavy Quark Symmetry (HQS) provides with an important simplification of the non relativistic three body problem which can be solved by means of a simple variational approach. This scheme is able to reproduce previous results obtained with more involved Faddeev calculations. The resulting wave functions are parametrized in a simple manner, and can be used to calculate further observables.
Fri, 31 Dec 2004 23:00:00 GMThttp://hdl.handle.net/10550/392652004-12-31T23:00:00ZStudy of the leptonic decays of pseudoscalar B,D and vector B-*,D-* mesons and of the semileptonic B -> D and B -> D-* decays
http://hdl.handle.net/10550/39264
Study of the leptonic decays of pseudoscalar B,D and vector B-*,D-* mesons and of the semileptonic B -> D and B -> D-* decays
Albertus, Conrado; Hernández Gajate, Eliecer; Nieves Pamplona, Juan Miguel; Verde Velasco, José María
We present results for different observables in weak decays of pseudoscalar and vector mesons with a heavy c or b quark. The calculations are done in a nonrelativistic constituent quark model improved at some instances by heavy quark effective theory constraints. We determine pseudoscalar and vector meson decay constants that within a few percent satisfy f(V)M(V)/f(P)M(P)=1, a result expected in heavy quark symmetry when the heavy quark masses tend to infinity. We also analyze the semileptonic B -> D and B -> D-* decays for which we evaluate the different form factors. Here we impose heavy quark effective theory constraints among form factors that are not satisfied by a direct quark model calculation. The value of the form factors at zero recoil allows us to determine, by comparison with experimental data, the value of the vertical bar V(cb)vertical bar Cabibbo-Kobayashi-Maskawa matrix element. From the B -> D semileptonic decay we get vertical bar V(cb)vertical bar=0.040 +/- 0.006, in perfect agreement with our previous determination based on the study of the semileptonic Lambda(b)->Lambda(c) decay and also in excellent agreement with a recent experimental determination by the DELPHI Collaboration. We further make use of the partial conservation of axial current hypothesis to determine the strong coupling constants g(B*B pi)(0)=60.5 +/- 1.1 and g(D*D pi)(0)=22.1 +/- 0.4. The ratio R=(g(B*B pi)(0)f(B*)root M-D/(g(D*D pi)(0)f(D*)root M-B)=1.105 +/- 0.005 agrees with the heavy quark symmetry prediction of 1.
Fri, 31 Dec 2004 23:00:00 GMThttp://hdl.handle.net/10550/392642004-12-31T23:00:00Z