Universal description of S-wave meson spectra in a renormalized light-cone QCD-inspired model

A light-cone QCD-inspired model, with the mass squared operator consisting of a harmonic oscillator potential as confinement and a Dirac-delta interaction, is used to study the S-wave meson spectra. The two parameters of the harmonic potential and quark masses are fixed by masses of rho(770), rho(1450), J/psi, psi(2S), K*(892) and B*. We apply a renormalization method to define the model, in which the pseudo-scalar ground state mass fixes the renormalized strength of the Dirac-delta interaction. The model presents an universal and satisfactory description of both singlet and triplet states of S-wave mesons and the corresponding radial excitations.Comment: RevTeX, 17 pages, 7 eps figures, to be published in Phys. Rev.

The Post-Newtonian Limit of f(R)-gravity in the Harmonic Gauge

A general analytic procedure is developed for the post-Newtonian limit of $f(R)$-gravity with metric approach in the Jordan frame by using the harmonic gauge condition. In a pure perturbative framework and by using the Green function method a general scheme of solutions up to $(v/c)^4$ order is shown. Considering the Taylor expansion of a generic function $f$ it is possible to parameterize the solutions by derivatives of $f$. At Newtonian order, $(v/c)^2$, all more important topics about the Gauss and Birkhoff theorem are discussed. The corrections to "standard" gravitational potential ($tt$-component of metric tensor) generated by an extended uniform mass ball-like source are calculated up to $(v/c)^4$ order. The corrections, Yukawa and oscillating-like, are found inside and outside the mass distribution. At last when the limit $f\rightarrow R$ is considered the $f(R)$-gravity converges in General Relativity at level of Lagrangian, field equations and their solutions.Comment: 16 pages, 10 figure

Clinical relevance of circulating tumour cells in the bone marrow of patients with SCCHN

Background: Clinical outcome of patients with head and neck squamous cell carcinoma (SCCHN) depends on several risk factors like the presence of locoregional lymph node or distant metastases, stage, localisation and histologic differentiation of the tumour. Circulating tumour cells in the bone marrow indicate a poor prognosis for patients with various kinds of malignoma. The present study examines the clinical relevance of occult tumour cells in patients suffering from SCCHN. Patients and Methods: Bone marrow aspirates of 176 patients suffering from SCCHN were obtained prior to surgery and stained for the presence of disseminated tumour cells. Antibodies for cytokeratin 19 were used for immunohistochemical detection with APAAP on cytospin slides. Within a clinical follow-up protocol over a period of 60 months, the prognostic relevance of several clinicopathological parameters and occult tumour cells was evaluated. Results: Single CK19-expressing tumour cells could be detected in the bone marrow of 30.7% of the patients. There is a significant correlation between occult tumour cells in the bone marrow and relapse. Uni- and multivariate analysis of all clinical data showed the metastases in the locoregional lymph system and detection of disseminated tumour cells in the bone marrow to be statistically highly significant for clinical prognosis. Conclusion: The detection of minimal residual disease underlines the understanding of SCCHN as a systemic disease. Further examination of such cells will lead to a better understanding of the tumour biology, as well as to improvement of diagnostic and therapeutic strategies

Masses of the physical mesons from an effective QCD--Hamiltonian

The front form Hamiltonian for quantum chromodynamics, reduced to an effective Hamiltonian acting only in the $q\bar q$ space, is solved approximately. After coordinate transformation to usual momentum space and Fourier transformation to configuration space a second order differential equation is derived. This retarded Schr\"odinger equation is solved by variational methods and semi-analytical expressions for the masses of all 30 pseudoscalar and vector mesons are derived. In view of the direct relation to quantum chromdynamics without free parameter, the agreement with experiment is remarkable, but the approximation scheme is not adequate for the mesons with one up or down quark. The crucial point is the use of a running coupling constant $\alpha_s(Q^2)$, in a manner similar but not equal to the one of Richardson in the equal usual-time quantization. Its value is fixed at the Z mass and the 5 flavor quark masses are determined by a fit to the vector meson quarkonia.Comment: 18 pages, 4 Postscript figure

Lukewarm black holes in quadratic gravity

Perturbative solutions to the fourth-order gravity describing spherically-symmetric, static and electrically charged black hole in an asymptotically de Sitter universe is constructed and discussed. Special emphasis is put on the lukewarm configurations, in which the temperature of the event horizon equals the temperature of the cosmological horizon

Density perturbations in general modified gravitational theories

We derive the equations of linear cosmological perturbations for the general Lagrangian density $f (R,\phi, X)/2+L_c$, where $R$ is a Ricci scalar, $\phi$ is a scalar field, and $X=-(\nabla \phi)^2/2$ is a field kinetic energy. We take into account a nonlinear self-interaction term $L_c$ recently studied in the context of "Galileon" cosmology, which keeps the field equations at second order. Taking into account a scalar-field mass explicitly, the equations of matter density perturbations and gravitational potentials are obtained under a quasi-static approximation on sub-horizon scales. We also derive conditions for the avoidance of ghosts and Laplacian instabilities associated with propagation speeds. Our analysis includes most of modified gravity models of dark energy proposed in literature and thus it is convenient to test the viability of such models from both theoretical and observational points of view.Comment: 17 pages, no figure

Strong Orientation Effects in Ionization of H2+_2^+ by Short, Intense, High-Frequency Light Sources

We present three dimensional time-dependent calculations of ionization of arbitrarily spatially oriented H$_2^+$ by attosecond, intense, high-frequency laser fields. The ionization probability shows a strong dependence on both the internuclear distance and the relative orientation between the laser field and the internuclear axis.Comment: 4 pages, 4 figure

Electronic Detection of Gravitational Disturbances and Collective Coulomb Interactions

The cross section for a gravitational wave antenna to absorb a graviton may be directly expressed in terms of the non-local viscous response function of the metallic crystal. Crystal viscosity is dominated by electronic processes which then also dominate the graviton absorption rate. To compute this rate from a microscopic Hamiltonian, one must include the full Coulomb interaction in the Maxwell electric field pressure and also allow for strongly non-adiabatic transitions in the electronic kinetic pressure. The view that the electrons and phonons constitute ideal gases with a weak electron phonon interaction is not sufficiently accurate for estimating the full strength of the electronic interaction with a gravitational wave.Comment: 7 pages LaTeX 1 figure afig1.ep

Gluon Distribution Functions for Very Large Nuclei at Small Transverse Momentum

We show that the gluon distribution function for very large nuclei may be computed for small transverse momentum as correlation functions of an ultraviolet finite two dimensional Euclidean field theory. This computation is valid to all orders in the density of partons per unit area, but to lowest order in $\alpha_s$. The gluon distribution function is proportional to $1/x$, and the effect of the finite density of partons is to modify the dependence on transverse momentum for small transverse momentum.Comment: TPI--MINN--93--52/T, NUC--MINN--93--28/T, UMN--TH--1224/93, LaTex, 11 page

Administración y Gestión de la Calidad Total en la Farmacia Oficinal: "Evaluación preliminar del plan desarrollado". (Parte 2)

To speak of quality pre-supposes that it is both appropriate and possible to verify the distinguishing elements orattributes that are characteristic of an object or entity. The consideration of Quality in pharmaceutical services, impliesthat the service provided fully fulfils the expectations of those using the service.In this report the preliminary results of the first stages of the application of the Quality Scheme and its impact on thegrowth of pharmaceutical service are considered.From the results obtained it became apparent that a successful outcome of the scheme depends upon the consolidationof the pharmacist - patient/client relationship. This factor was found to be of prime importance and was considered asa central element in the process of pharmaceutical care, within the concept of total quality.On the other hand, the analysis of the results of the bookkeeping records (not given in this report), shows that as aconsequence of the management scheme and the planning of the strategic processes of the service, greater efficiency inthe management of financial resources and a restriction on costs had been achieved.In summary, the application of the quality scheme produced an increase in profits, as a direct consequence of thereduction of costs related to non-quality activities (poor attention given to the patient, lack of information, high numberof returned expired drugs, etc.) and an increase in productivity associated with drug dispensing and good pharmaceuticalattention practices.Finally, it may be stated that our hypothesis was correct and that the development of quality and its pursuance go handin hand with the development and professional advancement within the ethical framework of the provision of a service.Hablar de calidad presupone que es oportuno y posible la verificación de las características o atributos que sonpropios de un objeto o entidad. Cuando planteamos la Calidad en un servicio de farmacia estamos diciendo que estecumple plenamente con las expectativas de quién se asiste por él.En este reporte acercamos los resultados preliminares de la primera etapa de aplicación del Plan de Calidad y suimpacto en el crecimiento del servicio farmacéutico.Del análisis de los resultados obtenidos se desprende que para el éxito definitivo del plan, es de suma importanciala consolidación de la relación Farmacéutico – Paciente/usuario como elemento central del proceso de atenciónfarmacéutica dentro de un concepto de calidad total.Por otra parte, el análisis de los resultados contables (no expuestos en este trabajo) ponen de manifiesto el logrode la eficiencia en el manejo de los recursos financieros y en la contención de costos, como consecuencia del plan degestión y el planeamiento de los procesos estratégicos del servicio.En resumen, desde la aplicación del plan de calidad, se produjo un incremento de las ganancias, como consecuenciadirecta de la reducción de costos relacionados con acciones de no calidad (mala atención al paciente, falta deinformación, elevado número de devoluciones de medicamentos por vencimiento, etc.) y por un aumento de laproductividad asociada a la dispensa del medicamento y a las buenas prácticas de atención farmacéutica.Finalmente podemos decir que nuestra hipótesis se cumple y que el desarrollo de la calidad y su búsqueda estánunidos al desarrollo y crecimiento profesional en un marco ético y de servicio