Thiourea:diethyl oxalate(2:1) complex: Single crystal diffraction at 100K

The crystal structure of thiourea:diethyl oxalate at 100k was solved using single crystal x-ray diffraction. The system crystallized in triclinic system, similar to that at room temeperature. No phase transition is observed at low temperature. The R-factor obtained was R[F2 > 2Σ(F2)] = 0.03. The crystal structure at low temperature induces closer packing of the molecules and general shrinkage of the unit cell and shortening of the hydrogen bonds to the by about 2%

Refractive elastic scattering of carbon and oxygen nuclei: The mean field analysis and Airy structures

The experimental data on the $^{16}$O$+^{12}$C and $^{18}$O$+^{12}$C elastic scatterings and their optical model analysis are presented. Detailed and complete elastic angular distributions have been measured at the Strasbourg Vivitron accelerator at several energies covering the energy range between 5 and 10 MeV per nucleon. The elastic scattering angular distributions show the usual diffraction pattern and also, at larger angles, refractive effects in the form of nuclear rainbow and associated Airy structures. The optical model analysis unambiguously shows the evolution of the refractive scattering pattern. The observed structure, namely the Airy minima, can be consistently described by a nucleus-nucleus potential with a deep real part and a weakly absorptive imaginary part. The difference in absorption in the two systems is explained by an increased imaginary (mostly surface) part of the potential in the $^{18}$O$+^{12}$C system. The relation between the obtained potentials and those reported for the symmetrical $^{16}$O$+^{16}$O and $^{12}$C$+^{12}$C systems is drawn.Comment: 10 pages, 9 figures, Phys. rev. C in pres

Wavy Strings: Black or Bright?

Recent developments in string theory have brought forth a considerable interest in time-dependent hair on extended objects. This novel new hair is typically characterized by a wave profile along the horizon and angular momentum quantum numbers $l,m$ in the transverse space. In this work, we present an extensive treatment of such oscillating black objects, focusing on their geometric properties. We first give a theorem of purely geometric nature, stating that such wavy hair cannot be detected by any scalar invariant built out of the curvature and/or matter fields. However, we show that the tidal forces detected by an infalling observer diverge at the `horizon' of a black string superposed with a vibration in any mode with $l \ge 1$. The same argument applied to longitudinal ($l=0$) waves detects only finite tidal forces. We also provide an example with a manifestly smooth metric, proving that at least a certain class of these longitudinal waves have regular horizons.Comment: 45 pages, latex, no figure

Crystal Structure Of 4-Aminopyridinium 3-(4-aminopyridinium) Succinate Tetra Hydrate: A New Complex From 4-Aminopyridine and Maleic Acid Crystallization

International audienc

Crystal structure of 4-aminopyridinium 3-(4-aminopyridinium) succinate tetra hydrate: A new salt from 4-aminopyridine and maleic acid crystallization

International audienc

2-Aminopyridinium maleate: A structural study

International audienc

Molecular interactions in the anomalous salt: 2-Aminopyridinium maleate maleic acid

International audienc

Innovation business plan at Siemens: Portfolio-based roadmapping to focus on promising innovation projects right from the beginning

Roadmapping is an effective tool for supporting innovation projects and business strategies. It is easy to implement and can be used in many different ways. In an international and globally operating company like Siemens, roadmapping offers senior management a valuable aid for decision-making that is easy to understand in any language. Siemens has developed a supportive approach to decision-making known as the innovation business plan. The core of this innovation business plan consists of a portfolio-based roadmapping process. The purpose of this paper is to provide an overview of the above-mentioned portfolio-based roadmapping approach within the innovation business plan and its compilation in the organization