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Moments of the spin structure functions g1p and g1d for 0.05<<sup>Q2</sup><3.0<sup> GeV2</sup>
Prok, Y.,Bosted, P.,Burkert, V.D.,Deur, A.,Dharmawardane, K.V.,Dodge, G.E.,Griffioen, K.A.,Kuhn, S.E.,Minehart, R.,Adams, G.,Amaryan, M.J.,Anghinolfi, M.,Asryan, G.,Audit, G.,Avakian, H.,Bagdasaryan, Elsevier 2009 Physics letters: B Vol.672 No.1
<P><B>Abstract</B></P><P>The spin structure functions <SUB>g1</SUB> for the proton and the deuteron have been measured over a wide kinematic range in <I>x</I> and <SUP>Q2</SUP> using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH<SUB>3</SUB> and ND<SUB>3</SUB> targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05<<SUP>Q2</SUP><5<SUP> GeV2</SUP> and W<3 GeV. The first moments of <SUB>g1</SUB> for the proton and deuteron are presented – both have a negative slope at low <SUP>Q2</SUP>, as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ0p is also reported. This quantity shows strong <SUP>Q2</SUP> dependence at low <SUP>Q2</SUP>. Our analysis of the <SUP>Q2</SUP> evolution of the first moment of <SUB>g1</SUB> shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ0p data and Chiral Perturbation calculations for γ0p, even at the lowest <SUP>Q2</SUP>.</P>
Matija Hoić,Mario Hrgetić,Nenad Kranjčević,Milan Kostelac,Joško Deur,Andreas Tissot 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1
The paper presents design of a disc-on-disc-type CNC (Computer Numerical Control) tribometer aimed at experimental characterization of friction and wear behaviors of automotive dry clutches. The torque or ormal force, slip speed, friction interface temperature, and closing time are accurately controlled during tests by employing rotational- and vertical-axis servodrives and a water-cooling system built in both axes. A compact two-axial piezoelectric torque and force sensor is built in between the vertical-axis spindle and the pressure plate, in order to provide direct measurements of friction torque and normal force. The slip speed is sensed by using an encoder placed at the rotating table that carries the friction plate. The disc temperature is controlled by means of imposing a delay between two consecutive clutch closing cycles, variable cooling pump speed, and a valve that can bypass the coolant flow around the pressure plate. The torque control ystem is realized in a cascade structure including inner normal force and vertical axis speed controllers. The closing time is controlled by means of “electrical inertia” implemented through rotational-axis servomotor torque control. The tribometer performances are demonstrated through a study of dry clutch friction plate wear rate characterization.
Moments of the neutron<sub>g2</sub>structure function at intermediate<sup>Q2</sup>
Solvignon, P.,Liyanage, N.,Chen, J.-P.,Choi, Seonho,Slifer, K.,Aniol, K.,Averett, T.,Boeglin, W.,Camsonne, A.,Cates, G. D.,Chang, C. C.,Chudakov, E.,Craver, B.,Cusanno, F.,Deur, A.,Dutta, D.,Ent, R.,F American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.1