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Search Results: 1 - 10 of 404979 matches for " M. Martinez "
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Recent Results on Jet Physics at the Tevatron
M. Martinez
Physics , 2009,
Abstract: In this contribution, a comprehensive review of the main aspects of high pt jet physics in Run II at the Tevatron is presented. Recent measurements on inclusive jet and dijet production are discussed using different jet algorithms and covering a wide region of jet transverse momentum and jet rapidity. Several measurements, sensitive to a proper description of soft gluon radiation and the underlying event in hadron collisions, are also shown.
Study of Jet Properties at the Tevatron
M. Martinez
Physics , 2005,
Abstract: Study of Jet Properties at the Tevatron (Proceedings of the XIX Rencontres de Physique de La Vallee d'Aoste) In this contribution, a number of new QCD results on jet production from the CDF and D0 experiments in Run II are discussed in detail.
High Pt Jet Physics
M. Martinez
Physics , 2006,
Abstract: In this contribution, a comprehensive review of the main aspects of high $\pt$ jet physics in Run II at the Tevatron is presented. Recent measurements on inclusive jet production are discussed using different jet algorithms and covering a wide region of jet transverse momentum and jet rapidity. Several measurements, sensitive to a proper description of soft gluon radiation and the underlying event in hadron collisions, are shown. Finally, high $\pt$ prompt photon measurements and studies on the production of electroweak bosons in association with jets in the final state are discussed.
Jet Physics at 2 Tev
M. Martinez
Physics , 2004,
Abstract: In this contribution, a review of some of the most important QCD jet preliminary results from both CDF and D0 experiments in Run II is presented, together with future prospects as the integrated luminosity increases.
Colloid Centrifugation of Semen: Applications in Assisted Reproduction  [PDF]
Jane M. Morrell, Heriberto Rodriguez-Martinez
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.78055
Abstract: Colloid centrifugation can be used to separate heterogeneous populations of cells particularly semen samples, which typically contain mixtures of spermatozoa at different stage of maturity together with dead and dying spermatozoa and also non-sperm cells. Colloids can be used to enrich the population of spermatozoa that are viable and functional; these are the spermatozoa that are needed for fertilization in Assisted Reproduction. Sperm samples obtained after colloid centrifugation may be enriched for motile, morphologically normal spermatozoa with intact chromatin. Insemination of mares with stallion sperm samples prepared by colloid centrifugation resulted in a higher pregnancy rate per cycle than controls, confirming that the good sperm attributes observed in the laboratory were indicative of functional spermatozoa. The method does not simply enrich for viable spermatozoa by inhibiting dead or dying spermatozoa from passing through the colloid since emerging evidence shows that colloid centrifugation can select for spermatozoa with certain properties such as metabolic activity. Other reproductive cells, such as spermatids or progenitor cells, may also be purified by colloid centrifugation. This review describes the history of colloid centrifugation for selecting spermatozoa, compares colloid centrifugation with alternative techniques, and finally describes some of the applications of the technique within the animal breeding industry.
A Novel Approach to a Piezoelectric Sensing Element
M. Martinez,A. Artemev
Journal of Sensors , 2010, DOI: 10.1155/2010/816068
Abstract: Piezoelectric materials have commonly been used in pressure and stress sensors; however, many designs consist of thin plate structures that produce small voltage signals when they are compressed or extended under a pressure field. This study used finite element methods to design a novel piezoelectric pressure sensor with a C-shaped piezoelectric element and determine if the voltage signal obtained during hydrostatic pressure application was enhanced compared to a standard thin plate piezoelectric element. The results of this study demonstrated how small deformations of this C-shaped sensor produced a large electrical signal output. It was also shown that the location of the electrodes for this sensor needs to be carefully chosen and that the electric potential distribution varies depending on the poling of the piezoelectric element. This study indicated that the utilization of piezoelectric materials of different shapes and geometries embedded in a polymer matrix for sensing applications has several advantages over thin plate solid piezoelectric structures. 1. Introduction Pressure gauges of different design types (e.g., U-shaped tube gauges, piston gauges, aneroid gauges, Bourdon tube, or diaphragm gauge [1, 2], optical fiber sensors [3, 4], different electronic sensors) are currently used in different applications. Electronic sensors are convenient because they allow for easy, direct integration into electronic control schemes which can be easily miniaturized and have a short response time when used under dynamic conditions. Electronic pressure sensors can be designed by using different electromechanical or magnetomechanical effects. Electronic sensor types include piezoelectric [5], piezoresistive [6], capacitive, magnetic (inductive), potentiometric, resonant, and surface acoustic wave sensors. In the fields of robotics and orthotics the McKibben actuators have been utilized to mimic the behavior of biological muscles. Son and Goulbourne, 2009 [7] showed how the use of the two electrical parameters capacitance or resistance could be used to measure the large strains/pressure of the actuating device. MEMS based on piezoresistive pressure sensors have also been considered for pressure measurement applications; however they posses low sensitivity and suffer thermal drift [6, 8]. Piezoelectric pressure sensors are commonly used in sensor designs due to their high reliability and robustness, large range of measurable pressure, and low sensitivity to the electro-magnetic field. In traditional piezoelectric pressure sensor designs, the piezoelectric
About the relevance of the Imaginary components of the effective couplings in the Asymmetry measurements
M. Martinez,F. Teubert
Physics , 1994, DOI: 10.1007/BF01571883
Abstract: The effect coming from imaginary parts of effective couplings in the $e^+ e^-$ asymmetries is investigated. It is shown that for the present level of experimental accuracy, in some asymmetries the imaginary parts of the effective couplings cannot be neglected and moreover that the use of different prescriptions on how to handle them in quoting just real effective couplings from the data may produce sizable differences. A definition of the real effective couplings specifying how to handle the imaginary parts is advocated.
Statistical fluctuations of the parametric derivative of the transmission and reflection coefficients in absorbing chaotic cavities
M. Martinez-Mares
Physics , 2004, DOI: 10.1103/PhysRevE.72.036202
Abstract: Motivated by recent theoretical and experimental works, we study the statistical fluctuations of the parametric derivative of the transmission T and reflection R coefficients in ballistic chaotic cavities in the presence of absorption. Analytical results for the variance of the parametric derivative of T and R, with and without time-reversal symmetry, are obtained for both asymmetric and left-right symmetric cavities. These results are valid for arbitrary number of channels, in completely agreement with the one channel case in the absence of absorption studied in the literature.
Exploring the Gamma Ray Horizon with the next generation of Gamma Ray Telescopes. Part 1: Theoretical predictions
O. Blanch,M. Martinez
Physics , 2001, DOI: 10.1016/j.astropartphys.2005.03.008
Abstract: The physics potential of the next generation of Gamma Ray Telescopes in exploring the Gamma Ray Horizon is discussed. It is shown that the reduction in the Gamma Ray detection threshold might open the window to use precise determinations of the Gamma Ray Horizon as a function of the redshift to either put strong constraints on the Extragalactic Background Light modeling or to obtain relevant independent constraints in some fundamental cosmological parameters.
On the existence of a time inhomogeneous skew Brownian motion and some related laws
Pierre Etore,M. Martinez
Mathematics , 2011,
Abstract: This article is devoted to the construction of a solution for the "skew inhomogeneous Brownian motion" equation, which first appear in a seminal paper by Sophie Weinryb (1983). We investigate some laws related to the constructed process. In particular, using the description of the straddling excursion above a deterministic time, we compute the joint law of the process, its local time and its straddling time.
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