6,951 research outputs found
Genomic organization of the mouse T-cell receptor β-chain gene family
We have combined three different methods, deletion mapping of T-cell lines, field-inversion gel electrophoresis, and the restriction mapping of a cosmid clone, to construct a physical map of the murine T-cell receptor β-chain gene family. We have mapped 19 variable (Vβ) gene segments and the two clusters of diversity (Dβ) and joining (Jβ) gene segments and constant (Cβ) genes. These members of the β-chain gene family span ~450 kilobases of DNA, excluding one potential gap in the DNA fragment alignments
Coronal heating in multiple magnetic threads
Context. Heating the solar corona to several million degrees requires the
conversion of magnetic energy into thermal energy. In this paper, we
investigate whether an unstable magnetic thread within a coronal loop can
destabilise a neighbouring magnetic thread. Aims. By running a series of
simulations, we aim to understand under what conditions the destabilisation of
a single magnetic thread can also trigger a release of energy in a nearby
thread. Methods. The 3D magnetohydrodynamics code, Lare3d, is used to simulate
the temporal evolution of coronal magnetic fields during a kink instability and
the subsequent relaxation process. We assume that a coronal magnetic loop
consists of non-potential magnetic threads that are initially in an equilibrium
state. Results. The non-linear kink instability in one magnetic thread forms a
helical current sheet and initiates magnetic reconnection. The current sheet
fragments, and magnetic energy is released throughout that thread. We find
that, under certain conditions, this event can destabilise a nearby thread,
which is a necessary requirement for starting an avalanche of energy release in
magnetic threads. Conclusions. It is possible to initiate an energy release in
a nearby, non-potential magnetic thread, because the energy released from one
unstable magnetic thread can trigger energy release in nearby threads, provided
that the nearby structures are close to marginal stability
Phase-Mixing and Dissipation of Standing Shear Alfven waves
We study the phase mixing and dissipation of a packet of standing shear
Alfv\'en waves localized in a region with non-uniform Alfv\'en background
velocity. We investigate the validity of the exponential damping law in time,
, presented by Heyvaerts & Priest (1983) for different ranges of
Lundquist, , and Reynolds, , numbers. Our numerical results shows that it
is valid for .Comment: 11 pages, 8 figure
Finding the Boundaries of Equitable Disgorgement
The disgorgement of “ill-gotten gains” is a significant mechanism for enforcing the securities laws. By compelling a violator of the securities laws to forfeit their illegal proceeds, disgorgement serves as a strong deterrent for securities fraud and an important method by which investors are compensated for unjust losses in the market—and today accounts for the recovery of billions of dollars annually. Despite its importance, commentators in recent years began to call into question theavailability of the disgorgement remedy for the SEC. The SEC purses disgorgement under the agency’s grant for seeking equitable relief for the benefit of investors; however, courts have arguably applied disgorgement in a manner that renders it a penalty—and thus beyond the scope of SEC enforcement.
In June 2020, the Supreme Court stepped in to provide clarity as to the future of disgorgement as an equitable remedy. In Liu v. SEC, the Court held that while disgorgement remains available for the SEC, a disgorgement award cannot exceed the net proceeds that result from a violation of the securities laws. More specifically, the Court took issue with three instances in which lower court applications of disgorgement had tested the line between equity and penalty. First was the common practice of returning disgorged funds to the Treasury rather than to harmed investors. Second was through the imposition of joint-and-several liability, and third was the practice of denying cost and expense deductions from disgorgement awards.
This Note proposes a method for navigating the boundary of equitable disgorgement. In particular, this Note argues that disgorged funds can be equitably returned to the Treasury to the extent that the method of remittance reflects a focus on investor compensation and an expansive view of “benefitting investors.” Further, joint-and-several liability may be appropriate in the context of a fraudster’s claim toproceeds held by another; and finally, equity requires that legitimate deductions include more than legitimate costs and expenses, but the subsequent disposal of profits as well. This approach to applying disgorgement can result in an equitable imposition of the remedy and the continued efficacy of an important enforcement mechanism for policing securities markets
Lunar magnetization concentrations (MAGCONS) antipodal to young large impact basins
Electron reflection measurements from Apollo 15 and 16 subsatellites show that patches of strong surface magnetic fields ranging in size from less than about 7 km to greater than 500 km are distributed over the surface of the Moon. With the exception of a few regions, no obvious association to surface geology has been found. Researchers examined the antipodes of 23 winged impact basins for which electron reflection measurements are available. It was concluded that the apparent temporal variations for the basin antipodes may reflect real variations in the lunar magnetic field
The Determinants of Home Ownership: An Application of Human Capital Investment Theory To the Home Ownership Decision
The decision to purchase a home is one of the most important financial decisions made by young adults today. This decision is influenced by several factors including the individual\u27s demographics and family characteristics. The purpose of this study is to focus on the influence of these factors on the probability of home ownership for young adults
The effect of the relative orientation between the coronal field and new emerging flux: I Global Properties
The emergence of magnetic flux from the convection zone into the corona is an
important process for the dynamical evolution of the coronal magnetic field. In
this paper we extend our previous numerical investigations, by looking at the
process of flux interaction as an initially twisted flux tube emerges into a
plane parallel, coronal magnetic field. Significant differences are found in
the dynamical appearance and evolution of the emergence process depending on
the relative orientation between the rising flux system and any preexisting
coronal field. When the flux systems are nearly anti-parallel, the experiments
show substantial reconnection and demonstrate clear signatures of a high
temperature plasma located in the high velocity outflow regions extending from
the reconnection region. However, the cases that have a more parallel
orientation of the flux systems show very limited reconnection and none of the
associated features. Despite the very different amount of reconnection between
the two flux systems, it is found that the emerging flux that is still
connected to the original tube, reaches the same height as a function of time.
As a compensation for the loss of tube flux, a clear difference is found in the
extent of the emerging loop in the direction perpendicular to the main axis of
the initial flux tube. Increasing amounts of magnetic reconnection decrease the
volume, which confines the remaining tube flux.Comment: 21 pages, 16 figures Accepted for Ap
Building one molecule from a reservoir of two atoms
Chemical reactions typically proceed via stochastic encounters between
reactants. Going beyond this paradigm, we combine exactly two atoms into a
single, controlled reaction. The experimental apparatus traps two individual
laser-cooled atoms (one sodium and one cesium) in separate optical tweezers and
then merges them into one optical dipole trap. Subsequently, photoassociation
forms an excited-state NaCs molecule. The discovery of previously unseen
resonances near the molecular dissociation threshold and measurement of
collision rates are enabled by the tightly trapped ultracold sample of atoms.
As laser-cooling and trapping capabilities are extended to more elements, the
technique will enable the study of more diverse, and eventually more complex,
molecules in an isolated environment, as well as synthesis of designer
molecules for qubits
- …