The pace of Late Triassic (LT) biodiversity loss is uncertain, yet it could help to decipher causal mechanisms of mass extinction. We investigated relative abundance distributions (RADs) of six LT plant assemblages from the Kap Stewart Group, East Greenland, to determine the pace of collapse of LT primary productivity. RADs displayed not simply decreases ...

Three tests based on fossil data indicate that high rates of extinction recorded in the penultimate (Guadalupian) stage of the Paleozoic era are not artifacts of a poor fossil record. Instead, they represent an abrupt mass extinction that was one of the largest to occur in the past half billion years. The final mass extinction of the ...

Three tests based on fossil data indicate that high rates of extinction recorded in the penultimate (Guadalupian) stage of the Paleozoic era are not artifacts of a poor fossil record. Instead, they represent an abrupt mass extinction that was one of the largest to occur in the past half billion years. The final mass extinction of the ...

... about the potential for abrupt climate changes from global warming during this century. Climate model simulations and observations suggest that rapid and sustained September arctic sea ice loss is likely i...

The assumption that observed mass outflow from a star is due to a magnetically driven wind implies an upper bound on the surface magnetic field strength from regions where the wind originates. Upper bounds for the surface fields in supergiants and Be stars are derived from fast magnetic rotator theory. We report evidence that corroborates Rosendhal's observation of an ...

The association of an electromagnetic signal with the merger of a pair of supermassive black holes would have many important implications. For example, it would provide new information about gas and magnetic field interactions in dynamical spacetimes as well as a combination of redshift and luminosity distance that would enable precise cosmological tests. A proposal first made by Bode and Phinney ...

This paper investigates how SM (essentially continuous monitoring of solution level, density, and temperature in all key process tanks) can improve loss detection in a formal statistical sense. The authors use a simulation code developed at Los Alamos (FACSIM) to simulate data from the Rokkasho Reprocessing Plant (RRP), which is now under construction in Japan. They show the ...

The orbital period of two Algol-type binaries, RW CrB and TU Her, are studied. It is discovered that the orbital period of RW CrB shows a secular decrease at the rate of dP/dt = -4.29�10-8 days yr-1 while the orbital period of TU Her varies in some complex way. Two jumps in the orbital period are found while it undergoes secular decrease at a rate of dP/dt = -2.92�10-6 days yr-1. The rates of ...

... to have freedor only in roll. ... twin-erw;iiie and multicrigine designs � ... unstable condition, the model yawed to a larpe anjrle and then rolled off abruptly ...

Abrupt changes on the Sun can create flares and coronal mass ejections that blast brief but powerful 'solar storms' into space. ...

Fluidization [Leva, 19391 is a physical process by which particles ... fluidization, at which the,character of the mass changes abruptly to a ...

for accurate mass-loss rates We identify #12;ve reasons as to why one should be concerned about the mass-loss for detecting mass loss in these objects, does not concern the mass-loss rate, but rather the mass ux. BasedMass loss ...

Observational evidence for mass loss from cool stars is reviewed. Spectra line profiles are used for the derivation of mass-loss rates with the aid of the equation of continuity. This equation implies steady mass loss with spherical symmetry. Data from bi...

The administration of cortisol, oxyphenylbutazone and indomethacin to rats results in a marked and abrupt loss of cutaneous collagen from these animals. This collagen loss was associated with the appearance of both collagenolytic and proteolytic activitie...

... vehicle. The program calculates the heating rates and total mass loss for a conical vehicle during a hypothetical reentry. This ...

Mitalas's (1980) study is generalized to treat sudden mass loss from a binary syste in an originally

... questions. Understanding mass loss is essential for following the evolution of single stars, binaries, star clusters, and galaxies. ...

We have found that the rate of mass loss M increases with an increase in the period of pulsation for

Evolution and nucleosynthesis of mass loss WR stars is studied, particularly evolution of stars with initial mass between 50 and 100 solar masses, during combustion of H and He. A semi-empirical mass loss formalism, the Roxburgh criterion for convection, ...

The spectra of 83 giant stars obtained by the ISO/SWS covering the wavelength range 2.4 - 45 ?m have been analysed. The stars of our sample have been selected on the basis of their IRAS colors as low mass loss candidates ([12]-[25] < 0 and [25]-[60] < -1.8, where [12]-[25] = 2.5;log(F25/F12) and [25]-[60] = 2.5;log(F60/F25)). The sample includes 10 ...

The distribution of secondary star masses in present-day post-common-envelope binaries (PCEBs) is calculated using four different models for angular momentum loss (AML) during the post-common-envelope phase: only gravitational radiation (GR), GR plus disrupted magnetic braking (DMB), GR plus reduced MB, and GR plus intermediate MB. For the DMB model, we ...

The period variations of three Algol-type binaries, TT Del, BO Mon, and Y Psc, are studied based on the analysis of the O-C observations. The orbital period of TT Del is discovered to be decreasing at a rate dP/dt=-2.20�10-6 days yr-1, while the orbital periods of BO Mon and Y Psc vary in some complex ways. For BO Mon, three abrupt changes in its orbital period are found ...

It has long been clear that most, if not all, of the mass loss experienced by stars from 0.8 to 8 solar masses occurs near the tip of the AGB and/or the RGB. Evolutionary studies have incorporated empirical mass loss laws but theoretical models suggest quite different dependence of ...

... further discussion will be based on 500 microsecond intervals providing larger average mass loss per interval than balance mass resolution. ...

dynamic history during atmospheric entry. By ... mass losses since the mass fraction devoted to heat ... low-mass-loss probe entry in the meteoric speed ...

As part of continuing study of steady state and transient two-phase pressure drop across abrupt area changes, steady state pressure losses across restrictions of varying geometries were determined using Freon and Freon vapor. The results obtained are cons...

Interferometric synthetic-aperture radar data collected by ERS-1/2 and Radarsat-1 satellites show that Antarctic Peninsula glaciers sped up significantly following the collapse of Larsen B ice shelf in 2002. Hektoria, Green and Evans glaciers accelerated eightfold between 2000 and 2003 and decelerated moderately in 2003. Jorum and Crane glaciers accelerated twofold in early 2003 and threefold by ...

specific choice for the law of magnetic braking, and for the loss of mass and angular momentum during mass and especially the laws for magnetic braking and system mass loss that we implemented. We then show which grids the system is by non- conservative mass transfer. We ...

We present extensive radio observations of the nearby Type Ibc supernovae 2004cc, 2004gq, and 2004dk spanning ? t? 8-1800 days after explosion. Using a dynamical model developed for synchrotron emission from a slightly decelerated blastwave, we estimate the velocity and energy of the fastest ejecta and the density profile of the circumstellar medium. The blastwaves for all three supernovae are ...

The pressure loss in a high pressure vessel of a piston-cylinder press was studied at the bismuth (I-II) and (II-III) transitions. This was accomplished by measuring the abrupt diminution of volume of bismuth, which was surrounded by a solid pressure tran...

Stress fractures represent mechanical disturbances and develop over a period of days or weeks, in contrast to traumatic fractures which develop abruptly at the moment of injury. They are generally not fractures in the usual sense of loss of structural con...

Several alternative methods for establishing alarm thresholds to detect an abrupt loss of bulk nuclear material have been evaluated. Both parametric and non-parametric statistical procedures have been used to characterize the cumulative distribution funct...

The daily food intake in human subjects can be maintained after abrupt exposure to high altitude. Under these conditions, it has been observed that (a) positive nitrogen balances can be achieved at altitude; (b) body weight losses are greatly reduced; (c)...

Long length vacuum insulated lines are used to carry flowing liquid nitrogen in several high temperature superconducting cable projects. An important, but rare, failure scenario is the abrupt or catastrophic loss of the thermal insulating vacuum producing a rapid increase in heat transfer to the liquid nitrogen stream. In this experimental investigation, a ...

The results for the control run for a single particle are shown in Figure 1. The figure, which includes other thermolytic data for Illinois No. 6 coal, shows that the particle was stable in size to around 440{degree}C. At that point it contracted very rapidly to about half its size over the next 15{degrees}. Also shown are data for the same coal from SRI`s field ionization ...

The results for the control run for a single particle are shown in Figure 1. The figure, which includes other thermolytic data for Illinois No. 6 coal, shows that the particle was stable in size to around 440[degree]C. At that point it contracted very rapidly to about half its size over the next 15[degrees]. Also shown are data for the same coal from SRI's field ionization ...

GEMSIS (Geospace Environment Modeling System for Integrated Studies) of Solar Terrestrial Environment Laboratory, Nagoya University, is the modeling project for understanding energy and mass transportation from the Sun to the Earth in the geospace environment. Aiming at understanding the dynamics of the inner magnetosphere during the geospace storms, we have developed ...

We report extensive radio and X-ray observations of SN 2003bg whose spectroscopic evolution shows a transition from a broad-lined Type Ic to a hydrogen-rich Type II and later to a typical hydrogen-poor Type Ibc. We show that the extraordinarily luminous radio emission is well described by a self-absorption dominated synchrotron spectrum while the observed X-ray emission is adequately fit by ...

Radiatively driven mass loss is an important factor in the evolution of massive stars. The mass loss rates depend on a number of stellar parameters, including the effective temperature and luminosity. Massive stars are also often rapidly rotating, which affects their structure and evolution. In sufficiently rapidly ...

Radiatively driven mass loss is an important factor in the evolution of massive stars. The mass-loss rates depend on a number of stellar parameters, including the effective temperature and luminosity. Massive stars are also often rapidly rotating, which affects their structure and evolution. In sufficiently rapidly rotating stars, ...