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Spin asymmetries in jet-hyperon production at LHC
Boer, D.,Bomhof, C.J.,Hwang, D.S.,Mulders, P.J. North-Holland Pub. Co 2008 Physics letters: B Vol.659 No.1
We consider polarized Λ hyperon production in proton-proton scattering, pp->(Λ<SUP>&</SUP>uarr;jet)jetX, in the kinematical region of the LHC experiments, in particular the ALICE experiment. We present a new Λ polarization observable that arises from the Sivers effect in the fragmentation process. It can be large even at midrapidity and therefore, is of interest for high energy hadron collider experiments. Apart from its potential to shed light on the mechanisms behind the phenomenon of Λ polarization arising in unpolarized hadronic collisions, the proposed observable in principle also allows to test the possible color flow dependence of single spin asymmetries and the (non)universality of transverse momentum dependent fragmentation functions.
Bhupathi, Pradeep,Hwang, Jungseek,Martin, Rodica M.,Blankstein, Jackson,Jaworski, Lukas,Mulders, Norbert,Tanner, David B.,Lee, Yoonseok The Optical Society 2009 Optics express Vol.17 No.13
<P>Optical transmission measurements were made on 98% porosity silica aerogel samples under various degrees of uniaxial strain. Uniaxially compressed aerogels exhibit large birefringence, proportional to the amount of compression, up to the 15% strain studied. The birefringence is mostly reversible and reproducible through multiple compression-decompression cycles. Our study demonstrates that uniaxially strained high porosity aerogels can be used as tunable waveplates in a broad spectral range.</P>
Polymer Modelling in Wall Ironing Simulations of a PET-Steel Laminate
J. Mulder,G.T. Nagy,P. ?u?tari?,T. ?u?tar,T. Rodi? 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Steel laminates with a poly(ethylene terephthalate) coating can provide an environmental friendlier solution for packaging applications than current lacquered processes. One of the most challenging applications is the beer and beverage can where the PET layer is subjected to high temperatures (> 100°C), high strain rates (> 3000 1/s) and high hydrostatic pressure (> 500 MPa) in the wall ironing process. Specific issues to be solved are polymer hairs in the process and scuffing or scraping of the coating. A realistic simulation of the wall ironing process is needed to understand the processing conditions that influence these phenomena. The Arruda-Boyce model proved to be a good constitutive model for PET in the as supplied state as well as the deformed state of the coating. An improvement can be made by a full thermomechanical coupling of strain rate, temperature and pressure. The major factor of influence in the wall ironing process is the entry angle of the ironing die. To overcome issues with the required small entry angle and high expansion forces in the die a special die profile has been patented.
Mathematical Biodynamic Feedthrough Model Applied to Rotorcraft
Venrooij, Joost,Mulder, Mark,Abbink, David A.,van Paassen, Marinus M.,Mulder, Max,van der Helm, Frans C. T.,Bulthoff, Heinrich H. IEEE 2014 IEEE transactions on cybernetics Vol.44 No.7
<P>Biodynamic feedthrough (BDFT) occurs when vehicle accelerations feed through the human body and cause involuntary control inputs. This paper proposes a model to quantitatively predict this effect in rotorcraft. This mathematical BDFT model aims to fill the gap between the currently existing black box BDFT models and physical BDFT models. The model structure was systematically constructed using asymptote modeling, a procedure described in detail in this paper. The resulting model can easily be implemented in many typical rotorcraft BDFT studies, using the provided model parameters. The model's performance was validated in both the frequency and time domain. Furthermore, it was compared with several recent BDFT models. The results show that the proposed mathematical model performs better than typical black box models and is easier to parameterize and implement than a recent physical model.</P>