1,474 research outputs found
The Convergence of Abortion Regulation in Germany and the United States: A Critique to Glendon\u27s Rights Talk Thesis
Brownian Particles far from Equilibrium
We study a model of Brownian particles which are pumped with energy by means
of a non-linear friction function, for which different types are discussed. A
suitable expression for a non-linear, velocity-dependent friction function is
derived by considering an internal energy depot of the Brownian particles. In
this case, the friction function describes the pumping of energy in the range
of small velocities, while in the range of large velocities the known limit of
dissipative friction is reached. In order to investigate the influence of
additional energy supply, we discuss the velocity distribution function for
different cases. Analytical solutions of the corresponding Fokker-Planck
equation in 2d are presented and compared with computer simulations. Different
to the case of passive Brownian motion, we find several new features of the
dynamics, such as the formation of limit cycles in the four-dimensional
phase-space, a large mean squared displacement which increases quadratically
with the energy supply, or non-equilibrium velocity distributions with
crater-like form. Further, we point to some generalizations and possible
applications of the model.Comment: 10 pages, 12 figure
The SUMER Data in the SOHO Archive
We have released an archive of all observational data of the VUV spectrometer
Solar Ultraviolet Measurements of Emitted Radiation (SUMER) on SOHO that has
been acquired until now. The operational phase started with 'first light'
observations on 27 January 1996 and will end in 2014. Future data will be added
to the archive when they become available. The archive consists of a set of raw
data (Level 0) and a set of data that are processed and calibrated to the best
knowledge we have today (Level 1). This communication describes step by step
the data acquisition and processing that has been applied in an automated
manner to build the archive. It summarizes the expertise and insights into the
scientific use of SUMER spectra that has accumulated over the years. It also
indicates possibilities for further enhancement of the data quality. With this
article we intend to convey our own understanding of the instrument performance
to the scientific community and to introduce the new, standard-FITS-format
database.Comment: 38 pages, 9 figures, accepted for publication by Solar Physic
Zur Spannungsverteilung in thermisch beanspruchten elastisch-plastischen Kreisscheiben bei einem speziellen nichtlinearen Verfestigungsgesetz
 
Benchmark-Tests mit der IBM DB2 Digital Library unter Einsatz des Java Access Layers [online]
On the attractors of two-dimensional Rayleigh oscillators including noise
We study sustained oscillations in two-dimensional oscillator systems driven
by Rayleigh-type negative friction. In particular we investigate the influence
of mismatch of the two frequencies. Further we study the influence of external
noise and nonlinearity of the conservative forces. Our consideration is
restricted to the case that the driving is rather weak and that the forces show
only weak deviations from radial symmetry. For this case we provide results for
the attractors and the bifurcations of the system. We show that for rational
relations of the frequencies the system develops several rotational excitations
with right/left symmetry, corresponding to limit cycles in the four-dimensional
phase space. The corresponding noisy distributions have the form of hoops or
tires in the four-dimensional space. For irrational frequency relations, as
well as for increasing strength of driving or noise the periodic excitations
are replaced by chaotic oscillations.Comment: 9 pages, 5 figure
LT3 Drive: substitution of differentials in the drivetrain
The basic principle of the LT3 drive system is a planetary gearing with a rotatable ring gear. Rolling piston cylinders enable this rotation by acting on the cam disk shaped outside of the ring gear which fix or loosen the ring gear accordingly.
By fixing the ring gear via the cylinders the gear ratio corresponds to the normal mechanical ratio of the gearing which is given by the combination of the planet gears and the ring gear. By loosening the ring gear completely there is no more power transmission to the carrier; hence, the carrier doesnât rotate anymore. In between, the rotational speed can be adjusted continuously between 0 and the maximum speed within only a few milliseconds, âonlineâ, as it were, depending on the compensatory need.
The technology was verified by the chair of Mobile Machines (Mobima) at Karlsruhe Institute of Technology. During the current second development process, the controlling of the system via high pressure components was elaborated. Furthermore, LT3 was designed for high torques up to 8,000 Nm. A feasibility study for heavy-duty vehicles was completed successfully in 2016.
The LT3 technology thereupon was âdownsizedâ for smaller systems. Possible applications for LT3 are all systems where synchronisation functions or to allow a superposition of the rotation speeds are necessary, especially with the objective to substitute the differential gear in electric vehicles with central motor.
In todayâs differential gears advanced driver-assistance systems normally intervene by brake action on the critical wheel. However, LT3 enables a planned control of each driven wheel. With that, active Torque Vectoring is possible which can operate foresightedly in every driving situation.
Saving potential mainly in production is the result of using the LT3 system. Viscous coupling unit or Haldex unit as well as Torsen differential are dropped. Also, the ASR assistant is no longer needed. In E-mobility application, mainly in small vehicles, space could be used in a better way or rather the packaging could be designed more favourable because the LT3 drive takes two functions at once: speed reduction of the motor and differential compensation of the driven wheels
Noise-Induced Transition from Translational to Rotational Motion of Swarms
We consider a model of active Brownian agents interacting via a harmonic
attractive potential in a two-dimensional system in the presence of noise. By
numerical simulations, we show that this model possesses a noise-induced
transition characterized by the breakdown of translational motion and the onset
of swarm rotation as the noise intensity is increased. Statistical properties
of swarm dynamics in the weak noise limit are further analytically
investigated.Comment: 7 pages, 7 figure
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