Refine
Year of publication
- 2015 (6) (remove)
Document Type
- Conference Proceeding (2)
- Report (2)
- Article (1)
- Working Paper (1)
Language
- English (6) (remove)
Has Fulltext
- yes (6) (remove)
Keywords
Atom interferometers have a multitude of proposed applications in space including precise measurements of the Earth's gravitational field, in navigation & ranging, and in fundamental physics such as tests of the weak equivalence principle (WEP) and gravitational wave detection. While atom interferometers are realized routinely in ground-based laboratories, current efforts aim at the development of a space compatible design optimized with respect to dimensions, weight, power consumption, mechanical robustness and radiation hardness. In this paper, we present a design of a high-sensitivity differential dual species 85Rb/87Rb atom interferometer for space, including physics package, laser system, electronics and software. The physics package comprises the atom source consisting of dispensers and a 2D magneto-optical trap (MOT), the science chamber with a 3D-MOT, a magnetic trap based on an atom chip and an optical dipole trap (ODT) used for Bose-Einstein condensate (BEC) creation and interferometry, the detection unit, the vacuum system for 10-11 mbar ultra-high vacuum generation, and the high-suppression factor magnetic shielding as well as the thermal control system.
The laser system is based on a hybrid approach using fiber-based telecom components and high-power laser diode technology and includes all laser sources for 2D-MOT, 3D-MOT, ODT, interferometry and detection. Manipulation and switching of the laser beams is carried out on an optical bench using Zerodur bonding technology. The instrument consists of 9 units with an overall mass of 221 kg, an average power consumption of 608 W (819 W peak), and a volume of 470 liters which would well fit on a satellite to be launched with a Soyuz rocket, as system studies have shown.
SInCom 2015
(2015)
Regarding moral concerns in the business sphere, integrity is often mentioned as one of the core values that guides the behavior of companies. Daimler for instance states: “Acting with integrity is the central requirement for sustainable success and a maxim that Daimler follows in its worldwide business practices.”1 Reference to integrity is mostly supposed to signal that the company acts morally responsibly. Although some companies specify what acting with integrity means for them, it generally remains unclear what the concept of integrity entails – both broadly speaking and referring to business. This conceptual gap shall be filled by developing a concept of integrity that can be transferred to the business context. For this purpose, the main criteria that constitute moral integrity will be discussed before reflecting on how these could be integrated into a practical and comprehensive concept of corporate integrity.
Earthquake response spectra as defined by Eurocode 8 (German NAD) are restricted to soils with shear wave velocities greater than 150 m/s. For soft soil layers e.g. of clay underlain by bedrock special investigations are required because resonance effects of the layer significantly influence the shape of the spectrum. Numerical investigations are normally based on a one-dimensional theory of horizontally polarized shear waves propagating in vertical direction. The paper describes a parametric study to define acceleration response spectra for a soft soil over a half-space for a wide range of soil layer heights and material parameters. Based on this study a simplified method to describe response spectra for the model of a soft soil layer underlain by a viscoelastic halfspace is given.
Sabbatical semester report
(2015)