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Search Results: 1 - 10 of 605788 matches for " M. J. Richard "
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Development of Analytical Model for Modular Tank Vehicle Carrying Liquid Cargo  [PDF]
M. Toumi, M. Bouazara, M. J. Richard
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.32010
Abstract:

The study of dynamics of tank vehicles carrying liquid fuel cargo is complex. The forces and moments due to liquid sloshing create serious problems related to the instability of tank vehicles. In this paper, a complete analytical model of a modular tank vehicle has been developed. The model included all the vehicle systems and subsystems. Simulation results obtained using this model was compared with those obtained using the popular TruckSim software. The comparison proved the validity of the assumptions used in the analytical model and showed a good correlation under single or double lane change and turning manoeuvers.

Do Individual Differences Moderate the Cognitive Benefits of Chewing Gum?  [PDF]
Richard Stephens, Nicola M. J. Edelstyn
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.28127
Abstract: Recent experiments investigating whether chewing gum enhances cognitive performance have shown mixed results and a recent replication failed to reproduce earlier findings. The present experiment aimed to investigate whether participant individual differences underlie the discrepant findings. Therefore, in addition to examining differences in Digit Span and Spatial Span performance across gum and control groups, chronotype, extraversion, habitual tiredness, current stress, current arousal and current thirst were assessed using questionnaires. Task difficulty was also manipulated. While there were no chewing gum effects under standard testing conditions, chewing gum enhanced Digit Span performance in the more difficult dual task condition. Furthermore, Spatial Span performance was improved by chewing gum in introverts but not extraverts and chewing gum was shown to eliminate the negative relationship between thirst and Digit Span performance. In explaining these data it is proposed that chewing gum may act both to reduce stress and to alleviate thirst.
Charmonium singlets, open charm and exotic hadrons
Richard, J. M.
High Energy Physics - Phenomenology , 2007,
Abstract: Caution is suggested on the comparison of the spin-singlet charmonium P-state with the centre of gravity of triplet states, when the mass splitting is of the order of a few MeV. The physics of new hidden-charm states X and Y is briefly reviewed. Perspectives for producing double-charm baryons and double-charm exotic mesons are discussed.
Elusive multiquark spectroscopy
Richard J.-M.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100301015
Abstract: A review is presented of past and recent attempts to build multiquark states within current models already describing ordinary mesons and baryons. This includes: coherence in the chromomagnetic interaction, tetraquarks with two heavy quarks, Steiner-tree models of con nement, and hadronic molecules, in particular in the hidden-charm sector. Some emphasis is put on the di culties encountered when extrapolating toward higher con gurations the dynamics of con ning forces, starting from the simple case of a quark and an antiquark, or three quarks in a colour singlet.
Safe domain and elementary geometry
J. -M. Richard
Physics , 2004,
Abstract: A classical problem of mechanics involves a projectile fired from a given point with a given velocity whose direction is varied. This results in a family of trajectories whose envelope defines the border of a 'safe' domain. In the simple cases of a constant force, harmonic potential and Kepler or Coulomb motion, the trajectories are conic curves whose envelope in a plane is another conic section which can be derived either by simple calculus or by geometrical considerations. The case of harmonic forces reveals a subtle property of the maximal sum of distances within an ellipse.
Recent issues in hadron spectroscopy
J. -M. Richard
Physics , 2004, DOI: 10.1016/j.nuclphysa.2005.02.029
Abstract: A brief survey is presented of recently discovered hadrons, some of them presumably demonstrating a new kind of internal structure. This includes : spin-singlet quarkonium, mesons with unexpected mass or width, baryons with two heavy quarks, and pentaquark candidates. Flavour configurations with a combination of light and heavy quarks appear as particularly promising.
Historical Survey of the Quasi-Nuclear Baryonium
J. M. Richard
Physics , 1999,
Abstract: We review ideas and speculations concerning possible bound states or resonances of the nucleon--antinucleon system.
Graph-Theoretic Approach for the Dynamic Simulation of Flexible Multibody Systems
M. J. Richard,M. Bouazara
Advances in Mechanical Engineering , 2012, DOI: 10.1155/2012/530132
Abstract: This paper provides a general description of a variational graph-theoretic formulation for simulation of flexible multibody systems (FMSs) which includes a brief review of linear graph principles required to formulate this algorithm. The system is represented by a linear graph, in which nodes represent reference frames on flexible bodies, and edges represent components that connect these frames. The method is based on a simplistic topological approach which casts the dynamic equations of motion into a symmetrical format. To generate the equations of motion with elastic deformations, the flexible bodies are discretized using two types of finite elements. The first is a 2 node 3D beam element based on Mindlin kinematics with quadratic rotation. This element is used to discretize unidirectional bodies such as links of flexible systems. The second consists of a triangular thin shell element based on the discrete Kirchhoff criterion and can be used to discretize bidirectional bodies such as high-speed lightweight manipulators, large high precision deployable space structures, and micro/nano-electromechanical systems (MEMSs). Two flexible systems are analyzed to illustrate the performance of this new variational graph-theoretic formulation and its ability to generate directly a set of motion equations for FMS without additional user input. 1. Introduction Stringent tolerances on mechanical components have created increasingly severe demands on the quality of new mechanical designs. The mathematical models used to simulate the various types of mechanical systems these days need to incorporate an optimization algorithm capable of predicting and improving the efficiency of an FMS design. Since the equations governing the motion of FMS are highly nonlinear and dynamically coupled, one must exploit some kind of linear graph principles [1–4] to properly define the interconnection between the bodies. By combining linear graph theory [5–8] with the principle of virtual [9–11] work and finite elements, a dynamic formulation is obtained that extends graph-theoretic (GT) modelling methods to the analysis of 3D beams and shell surfaces of FMS. The widespread interest in flexible multibody systems is evidenced by the existence of a large number of algorithms [12]. It has been shown [13–15] that for multibody systems, a graph-theoretic formulation can generate a minimal set of equations. GT-based approaches explicitly separate the linear topological equations for the entire system from the nonlinear constitutive equations for individual components, resulting in very
Rapid Method for the Determination of Total Monosaccharide in Enterobacter cloacae Strains Using Fourier Transform Infrared Spectroscopy  [PDF]
Richard J. Delle Bovi, Allan Smits, Harry M. Pylypiw Jr
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22025
Abstract: Fourier Transform Infrared Spectroscopy (FTIR) was used to quantify total monosaccharide content in the bacterium Enterobacter cloacae and several of its biofilm mutants. Bacterial biofilm samples were grown on trypticase soy agar, and 30 µL aliquots of aqueous sample bacterial plus biofilm were deposited into the center of barium fluoride crystals and dried at 50°C for 1-hour before being scanned by FTIR. The total amounts of monosaccharides were estimated using the absorbance of the mono-saccharide peak, 1192 - 958 cm–1, and normalized using the amide II peak, 1585 - 1483 cm–1. This method provided a linear correlation between the absorbance of the monosaccharide peak and concentration of monosaccharide in standard monosaccharides, fructose, glucose, mannose, and rhamnose, over a concentration range of 0.5 - 2.0 mg/mL.
Search for Flavoured Multiquarks in a Simple Bag Model
S. Zouzou,J. -M. Richard
Physics , 1993, DOI: 10.1103/PhysRevLett.71.1332
Abstract: We use a bag model to study flavoured mesonic $(Qq\bar q\bar q)$ and baryonic $({\overline Q}qqqq)$ states, where one heavy quark $Q$ is associated with light quarks or antiquarks, and search for possible stable multiquarks. No bound state is found. However some states lie not too high above their dissociation threshold, suggesting the possibility of resonances, or perhaps bound states in improved models.
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