Non-adiabatic Current Excitation in Quantum Rings

We investigate the difference in the response of a one-dimensional semiconductor quantum ring and a finite-width ring to a strong and short-lived time-dependent perturbation in the THz regime. In both cases the persistent current is modified through a nonadiabatic change of the many-electron states of the system, but by different mechanisms in each case.Comment: LaTeX, 5 pages with 6 embedded postscript figures, submitted to 20th Nordic Semiconductor Meeting, Tampere (2003

Pengaruh Aspek Sosial Budaya Pada Desain Interior Hotel Niagara Di Lawang

The Influence of culture and social aspects in the interior design of Niagara hotel in Lawang is a research taking the time perspective of the Colonial phase (1900-1942), the phase when Niagara hotel began to be build. During that phase, there was a social penal system that triggered competitions among the people to receive appreciation or recognition of social honor among the middle class (the Chinese) society. The form of competitive interactions in the Chinese community is to get appreciation or honorable recognition by revealing their life aspects to the high class community, the Europeans. As a case study in this subject matter, Liem Sian Yu, a part of the middle class society, built the Niagara Hotel. All his competitive experiences to achieve appreciation or social recognition from the society during that time were actualized through the style, the choosing and processing of materials, and the balanced design principles applied in the Niagara Hotel

Carrier scattering, mobilities and electrostatic potential in mono-, bi- and tri-layer graphenes

The carrier density and temperature dependence of the Hall mobility in mono-, bi- and tri-layer graphene has been systematically studied. We found that as the carrier density increases, the mobility decreases for mono-layer graphene, while it increases for bi-layer/tri-layer graphene. This can be explained by the different density of states in mono-layer and bi-layer/tri-layer graphenes. In mono-layer, the mobility also decreases with increasing temperature primarily due to surface polar substrate phonon scattering. In bi-layer/tri-layer graphene, on the other hand, the mobility increases with temperature because the field of the substrate surface phonons is effectively screened by the additional graphene layer(s) and the mobility is dominated by Coulomb scattering. We also find that the temperature dependence of the Hall coefficient in mono-, bi- and tri-layer graphene can be explained by the formation of electron and hole puddles in graphene. This model also explains the temperature dependence of the minimum conductance of mono-, bi- and tri-layer graphene. The electrostatic potential variations across the different graphene samples are extracted.Comment: 18 pages, 7 figure

Bulk and shear relaxation in glasses and highly viscous liquids

The ratio between the couplings of a relaxational process to compression and shear, respectively, is calculated in the Eshelby picture of structural rearrangements within a surrounding elastic matrix, assuming a constant density of stable structures in distortion space. The result is compared to experimental data for the low-temperature tunneling states in glasses and to Prigogine-Defay data at the glass transition from the literature.Comment: 6 pages, 2 figures, 53 references; version after understanding the Prigogine-Defay ratio at the glass transition in the accompanying paper arXiv:1203.3555 [cond-mat.dis-nn

Coherent transport through graphene nanoribbons in the presence of edge disorder

We simulate electron transport through graphene nanoribbons of experimentally realizable size (length L up to 2 micrometer, width W approximately 40 nm) in the presence of scattering at rough edges. Our numerical approach is based on a modular recursive Green's function technique that features sub-linear scaling with L of the computational effort. We identify the influence of the broken A-B sublattice (or chiral) symmetry and of K-K' scattering by Fourier spectroscopy of individual scattering states. For long ribbons we find Anderson-localized scattering states with a well-defined exponential decay over 10 orders of magnitude in amplitude.Comment: 8 pages, 6 Figure

Desain Dan Kasus Pembajakan Karya Intelektual Di Indonesia

Design piracy, though considered as serious problems, is often overlooked. This phenomenoncommonly found in Third World countries. The government have been have been employing many ways to reduce piracy, such as adopting Intellectual Property Rights. But the effort to combat piracy was challenged by some parties which benefited from such activities. Piracy, in micro perspective, eliminates fair competition and creates unfair competition. The culture of piracy also harassed and submerged the role of law. Law enforcement toward Intellectual Property Rights is a must. The challenge is how to awaken members of society toward the importance of Intellectual Property Rights

Pengaruh Panjang Entres Terhadap Keberhasilan Sambung Pucuk Dan Pertumbuhan Benih Jambu Mete

The research was to obtain proper length of upper stem to the success rate of grafting and grwoth of the seedling cashew nut plants have been conducted in the Garden Experiments Cikampek, Karawang regency, West Java. Soil types was rocky laterite andesite, type C climate and altitude of 50 meters above sea level. The research was conducted in August 2009 until April 2010. While the materials used cashew seed type B 02 for both rootstock and to the upper stem. Grafting was done after 3 months old seedlings with seedlings about 60 cm high and 0.6 cm diameter stems of seedlings. Experiments prepared following the randomized block design was repeated three times that consisting of 10 plants. The treatments were tested namely long scion 10, 15 and 20 cm. Plants grew in polybags with size 15 x 25 cm. The indicators were observed covering the base of the cuttings scion diameter, cutting the base color of entres, the percentage of shoots continued success, increased plant height, leaf number and stem diameter of the seed.The results showed that the length of entres effect on continued success grafting of seedling cashew. Scion length was 20 cm which gave the highest grafting success is as much as 78%