Tiny Moment Research Articles

Measurement of tiny moment of inertia based on flexure hinge for automobile collision testing

Abstract The moment of inertia is a critical parameter for determining the motion state of an object and achieving precise control. At present, measurement techniques for the moment of inertia of large and heavy objects (greater than 0.5 kgm2) are very mature. However, it is still a challenge to achieve high precision for smaller objects (less than 0.5 kgm2). In this paper, a measuring device based on flexure hinges is proposed to achieve high-accuracy measurement of tiny moments of inertia, without additional friction. A theoretical model of measurement is developed and optimised to obtain the rotational inertia by measuring swing periods. The experimental results show that the maximum load of the device is 20 kg, and the resolution reaches 4 × 10−5 kgm2. For a 5 kg head model, the moment of inertia was measured to be 0.011 58 kgm2, with a combined standard uncertainty of 0.000 29 kgm2.

"We’ll Always Publish a Good Story": A Chat With Grant Faulkner, Editor of 100 Word Story

For writers who need a warm-up exercise, Grant Faulkner’s got a challenge for you: In 100 words, try to capture a “frisson, a shard, and a tiny moment.” Officially, Grant Faulkner is a recent runner-up for The Southwest Review's 2010 David Nathan Meyerson Fiction Prize. His stories have appeared in The Southwest Review, The Rumpus, Gargoyle, The Berkeley Fiction Review, Word Riot, The Big Ugly Review, Used Furniture Review, Ink, and Transfer. He's currently the managing editor at the National Writing Project and founding editor of 100 Word Story. He's also working on his first novel, Elsewhere, and blogging about books and writing at Lit Matters.

An Idea of Order at St. Francis de Sales

An Idea of Order at St. Francis de Sales Michael McGibney Whelan As we beheld her striding there alone,Knew that there never was a world for herExcept the one she sang and, singing, made. —Wallace Stevens It was as wasHas ever been wont to be—Selective and elusive enigmatic. That tiny moment thatOnly a very newLittle-boy-wonder-capture-senseCould catch. A butterfly of early timeLighting on a flower. And thenOpening the glory of its wingsTo lift away on air. In a gentle net his nascentMemory caughtIt and yet It flew simultaneousAwayInto the void of was As ifIt had two beings,One caught, oneBeyond, unlinked. It teased like the songStevens caughtOut of the nightInsisting it had no link to the worldOver whose sea it carried itself. What the boy caughtNever left him. That sudden blend ofScent and sight. That seaOf flowers on a Saturday afternoonAs he and his friends played inThe empty church of St. Francis de SalesOn East 96th Street. Roses, gardenias andLilies waiting all in white on a wedding. [End Page 272] Seventy years later,That lush luscious blur of whites in glory,And their sumptuous scent in his mindStill vivid freshAs then There for only that momentOn a Saturday afternoon That unlinked itself and liftedIts tiny flighting glory into The void of was. [End Page 273] Michael McGibney Whelan Washington, D.C. Copyright © 2019 Johns Hopkins University Press

Walking as Memorial Ritual: Pilgrimage to the Past

Walking as Memorial Ritual: Pilgrimage to the Past

Neutron scattering studies on URu2Si2

This paper aims to review some of the neutron scattering studies performed on URu2Si2 in Grenoble. This compound has been studied for a quarter of century because of a so-called hidden-order ground state visible by most of the bulk experiments but almost invisible by microscopic probes like neutrons, muons NMR or X-ray. We stress on some aspects that were not addressed previously. Firstly, the comparison of the cell parameters in the 1-2-2 systems seems to point that the magnetic properties of URu2Si2 are leading by an U4+ electronic state. Secondly, a compilation of the different studies of the tiny antiferromagnetic moment indicates that the tiny antiferromagnetic moment has a constant value which may indicate that it is not necessarily extrinsic. We also present the last development on the magnetic form factor measurement in which the magnetic density rotates when entering in the hidden-order state. To end, the thermal dependence of the two most intense magnetic excitations at Q0 = (1,0,0) and Q1 = (0.6,0,0) seems to indicate two different origins or processes for these excitations.

Parasitic Small-Moment Antiferromagnetism and Nonlinear Coupling of Hidden Order and Antiferromagnetism inURu2Si2Observed by Larmor Diffraction

We report for the first time simultaneous microscopic measurements of the lattice constants, the distribution of the lattice constants, and the antiferromagnetic moment in high-purity URu(2)Si(2), combining Larmor and conventional neutron diffraction at low temperatures and pressures up to 18 kbar. Our data demonstrate quantitatively that the small moment in the hidden order (HO) of URu(2)Si(2) is purely parasitic. The excellent experimental conditions we achieve allow us to resolve that the transition line between HO and large-moment antiferromagnetism (LMAF), which stabilizes under pressure, is intrinsically first order and ends in a bicritical point. Therefore, the HO and LMAF must have different symmetry, which supports exotic scenarios of the HO such as orbital currents, helicity order, or multipolar order.

Edward Elgar's Facebook Page

In just a handful of years, social networking tools have become part of our daily work and conversation. In just a handful of years, a tiny moment in human history, we have become a world of social networker. Social networking tools, as seen in the various Internet sites, are part of our daily work and conversation. In embracing these ideas, we are starting to forget that we did not always view society as a nexus of friends and connections. Our ability to recognize and analyze social networks matured in parallel with our ability to build and manage large-scale data networks.

Antiferromagnetic Ordering of CeOs4Sb12 below 1 K

Neutron diffraction measurements were performed on single-crystal samples to study the nature of the exotic order phase of CeOs4Sb12 below the transition temperature 0.9 K. An antiferromagnetic ordering with propagation vector q = (1 0 0), and a tiny moment is determined as the magnetic ground state. Our neutron data provide direct evidence for a spin-density-wave (SDW) ground state as first proposed by Yogi et al.

Evidence of spin density wave of CeOs 4Sb 12

Elastic neutron diffraction measurements were performed on single crystals to study the ground state below the mysterious exotic transition temperature 0.86 K. An antiferromagnetic order with a tiny moment of 0.027 μB per formula is formed as the ground state for CeOs 4Sb 12 below the transition point. Our neutron data gives the evidence of spin density wave state for CeOs 4Sb 12 in this work.

Evidence for a hidden order parameter in URu2Si2

We have measured the field dependence of the ordered antiferromagnetic moment and the magnetic excitations in URu2Si2 for fields up to 17T applied along c axis, using neutron scattering. The decrease of the magnetic intensity of the tiny moment m with increasing field does not follow a simple power law, but shows a clear inflection point, suggesting that the moment m is connected to a hidden order parameter Ψ. The magnetic excitation gap at Q=(1,0,0) increases continuously with increasing field, while that at Q=(1.4,0,0) is nearly constant.

Inflection point in the magnetic field dependence of the ordered moment of URu2Si2 observed by neutron scattering in fields up to 17 T.

We have measured the magnetic field dependence of the ordered antiferromagnetic moment and the magnetic excitations in the heavy-fermion superconductor URu2Si2 for fields up to 17 T applied along the tetragonal c axis, using neutron scattering. The decrease of the magnetic intensity of the tiny moment with increasing field does not follow a simple power law, but shows a clear inflection point, indicating that the moment disappears first at the metamagnetic transition at approximately 40 T. This suggests that the moment m is connected to a hidden order parameter psi which belongs to the same irreducible representation breaking time-reversal symmetry. The magnetic excitation gap at the antiferromagnetic zone center Q = (1,0,0) increases continuously with increasing field, while that at Q = (1.4,0,0) is nearly constant. This field dependence is opposite to that of the gap extracted from specific-heat data.

195Pt NMR study in U(Pt 1 − xPd x) 3

195Pt NMR study has been performed in U(Pt 1 − x Pd x ) 3. The hyperfine coupling constant of 195Pt was obtained to be −85kOe/μ B in U(Pt 1 − x Pd x ) 3 for0 ⩽ × ⩽ 0.05. The large transferred field arises from the spin polarization of the Pt 4d-electron induced by the magnetic moment of U 5f-electrons. In the antiferromagnetically ordered (AF) state of U(Pt 0.95Pd 0.05) 3, which has the ordered moment of 0.65 μ B , the NMR spectrum in zero field has shown the existence of an internal field of about 30 kOe. Since the magnetic structures of UPt 3 and U(Pt 0.95Pd 0.05) 3 proposed by the neutron diffraction experiment are the same, an appearance of the internal field is also expected in UPt 3. However, the internal field associated with a tiny moment ( 0.02 μ B ) has never been observed in UPt 3. This result has shown that the AF order in UPt 3 is not static but fluctuating.

Tiny moment magnetism and thermal fluctuations in UPt 3

The tiny moment antiferromagnetic correlations in UPt 3 are interpreted within the crystal field singlet-doublet scheme. Ginzburg-Landau equation for a spatial variation of the staggered magnetic moment is obtained and the correlation length is shown to be ∼ 10 2 interatomic distances. It is shown also that, within the suggested scheme, thermal fluctuations play a dominant role practically in a whole temperature region, where the correlations are observed.

6Li elastic form factors and antisymmetrization

In the framework of the Resonating-Group Model elastic longitudinal and transverse6Li form factors are calculated. The form factors and the tiny quadrupole moment are reproduced simultaneously by a fully antisymmetric wave function consisting of three clusters. We demonstrate that complete antisymmetrization is a necessary ingredient for these results.

Evidence of magnetic order of Cu moments in the superconducting and normal region of La2−Sr CuO4: Observation of Cu-NQR for 0.12≦x≦0.40

The observation of Cu-NQR in La2−xSrxCuO4 revealed that the spectra were splitted into two peaks at low temperatures and that its separation decreased with increasing x. This fact indicates that the well-defined hyperfine field due to magnetic ordering of Cu moments exists in the superconducting and normal metallic regions. The nuclear spin-lattice relaxation rate, 1/T1 of the Cu spectra is suppressed apparently by the superconducting energy gap for x≦0.20, while its temperature dependence obeys the Korringa relation for the normal region of x≧0.25. The nuclear spin-spin relaxation rate, 1/T2 increases proportionally with increasing hyperfine field, indicating the dominant indirect unclear spin coupling via virtual excitation of antiferromagnetic spin waves. The coexistence of superconductivity and the magnetic order of Cu d-electrons with a tiny moment is demonstrated by the NQR study in the La-Sr-Cu-O system