[en] River valley profile is one geomorphic feature, which contain relict landforms inherited from past periods with changing intensities of tectonic and climatic parameters. This aspect has been a subject of current research interest, using exposure dating technique. The results of some recent studies from major river valleys across Himalayas are being discussed

[en] In this work we present experimental and theoretical investigations of the directional solidification of Al-36 wt% Ni alloy. A phase-field approach (Folch and Plapp 2005 Phys. Rev. E 72 011602) is coupled with the CALPHAD (calculation of phase diagrams) method to be able to simulate directional solidification of Al-Ni alloy including the peritectic phase Al₃Ni. The model approach is calibrated by systematic comparison to microstructures grown under controlled conditions in directional solidification experiments. To illustrate the efficiency of the model it is employed to investigate the effect of temperature gradient on the microstructure evolution of Al-36 wt% Ni during solidification.

No abstract available

[en] Particles of Al-Ni alloys with different compositions (Al–50 wt-% Ni and Al–36 wt-% Ni) were produced using a drop tube-impulse system, known as Impulse Atomization. The microstructure of these rapidly solidified particles was compared with those solidified in a DSC at low cooling rates (0.083 and 0.33 K/sec). Also, the microstructure of the sample solidified in microgravity on-board of the TEXUS 44 sounding rocket was analyzed. Neutron diffraction was used to investigate the phases formed during different solidification processes. From SEM micrographs and neutron diffraction it was found that the inner parts of the TEXUS sample and the sample that was cooled at 0.083 K/sec contain almost no eutectic structure. The outer rim of the TEXUS sample showed the highest amount of Al₃Ni and lowest amount of Al₃Ni₂ Increasing the cooling rate from 0.083 to 0.33 K/sec increased the Al₃Ni/Al₃Ni₂ ratio. Opposite trend was observed in the impulse-atomized particles, where increasing the cooling rate decreased the Al₃Ni/Al₃Ni₂ ratio.

[en] Nuclear spectroscopic information for experimentally investigated nuclides of mass 36 (Mg, Al, Si, P, S, Cl, Ar, K, Ca) has been evaluated. The principal sources of the ‘adopted levels’ presented for nuclides close to the stability line are Endt's evaluations (1990En08, 1978En02). The data sets for reactions and decays, including all available gamma–ray data, are based mostly on the original literature. The ³⁶Na has been looked for but not yet experimentally detected. There are no data available for the excited states in ³⁶Al, and for ³⁶Mg and ³⁶Ca, only one excited state is known.

No abstract available

[en] The masses of 39 neutron-rich nuclei in the mass range 17 to 37 have been measured using a direct time-of-flight technique following the fragmentation of a ⁴⁸Ca beam at 55 MeV/nucleon. The masses of ^29,30Ne, ^34,35Mg and ^36,37Al are reported for the first time. The very neutron-rich nuclei, ^31-33Na, are found to be 2-4 MeV less bound than previously believed. Comparison is made with recently available large scale shell model calculations encompassing the deformed A∼32 nuclei. Conclusions are drawn regarding the extent of the region of deformation, which is found to include ³⁰Ne

[en] Yields of neutron-rich projectile fragments have been measured at 0⁰ for the reaction of 212-MeV/amu ⁴⁸Ca ions on an 890-mg-cm^-2 beryllium target. Fourteen nuclides have been observed for the first time. The systematics of production cross sections are discussed

[en] Energy integrated reaction cross-section measurements of around sixty neutron-rich nuclei covering the region of closed shells N=20 and N=28 were performed at intermediate energy (30-65 A. MeV) using direct method. In this experiment, silicon detectors were used as active targets. The reduced strong absorption radii, r₀², for 19 new nuclei (²⁷F, ^27,30Ne, ³³Na, ^28,34-35Mg, ^36-38Al, ^38-40Si, ^41-42P, ^42-44S and ⁴⁵Cl) are deduced for the first time. An additional 60 radii, also measured in this experiment, are compared to results from literature. A new quadratic parametrization is proposed for the nuclear radius as a function of the isospin in the region of closed shells N=8 and N=28. According to this parametrization, the skin effect is well reproduced and anomalous behaviour on the radii are observed in ²³N, ²⁹Ne, ³³Na, ³⁵Mg, ⁴⁴S, ⁴⁵Cl and ⁴⁵Ar nuclei. (orig.)