2,482 research outputs found
Constrained Minimization Under Vector-Valued Criteria in Linear Topological Spaces
Constrained minimization under vector valued criteria in linear topological space
Modelling electric vehicles use: a survey on the methods
In the literature electric vehicle use is modelled using of a variety of approaches in power systems, energy and environmental analyses as well as in travel demand analysis. This paper provides a systematic review of these diverse approaches using a twofold classification of electric vehicle use representation, based on the time scale and on substantive differences in the modelling techniques. For time of day analysis of demand we identify activity-based modelling (ABM) as the most attractive because it provides a framework amenable for integrated cross-sector analyses, required for the emerging integration of the transport and electricity network. However, we find that the current examples of implementation of AMB simulation tools for EV-grid interaction analyses have substantial limitations. Amongst the most critical there is the lack of realism how charging behaviour is represented
Extreme precision in rhythmic interaction is enabled by role-optimized sensorimotor coupling: Analysis and modelling of West African drum ensemble music
Human social interactions often involve carefully synchronized behaviours. Musical performance in particular features precise timing and depends on the differentiation and coordination of musical/social roles. Here, we study the influence of musical/social roles, individual musicians and different ensembles on rhythmic synchronization in Malian drum ensemble music, which features synchronization accuracy near the limits of human performance. We analysed 72 recordings of the same piece performed by four trios, in which two drummers in each trio systematically switched roles (lead versus accompaniment). Musical role, rather than individual or group differences, is the main factor influencing synchronization accuracy. Using linear causal modelling, we found a consistent pattern of bi-directional couplings between players, in which the direction and strength of rhythmic adaptation is asymmetrically distributed across musical roles. This differs from notions of musical leadership, which assume that ensemble synchronization relies predominantly on a single dominant personality and/or musical role. We then ran simulations that varied the direction and strength of sensorimotor coupling and found that the coupling pattern used by the Malian musicians affords nearly optimal synchronization. More broadly, our study showcases the importance of ecologically valid and culturally diverse studies of human behaviour
On the Electronic Transport Mechanism in Conducting Polymer Nanofibers
Here, we present theoretical analysis of electron transport in polyaniline
based (PANi) nanofibers assuming the metalic state of the material. To build up
this theory we treat conducting polymers as a special kind of granular metals,
and we apply the quantum theory of conduction in mesoscopic systems to describe
the transport between metallic-like granules. Our results show that the concept
of resonance electron tunneling as the predominating mechanism providing charge
transport between the grains is supported with recent experiments on the
electrical characterization of single PANi nanofibers. By contacting the
proposed theory with the experimental data we estimate some important
parameters characterizing the electron transport in these materials. Also, we
discuss the origin of rectifying features observed in current-voltage
characteristics of fibers with varying cross-sectional areas.Comment: 5 pages, 1 figure, accepted for publication in Phys. Rev. B, Vol.72,
xxxx (2005
Peningkatan Perekonomian Masyarakat Melalui Pengembangan Lokasi Wisata Desa Waleo Dua
Desa wisata merupakan tempat yang menawarkan daya tarikyang khas dengan menonjolkan keindahan alam, budaya, sertakuliner yang berada di suatulokasi. Korelasi dari semua potensitersebut, desa wisata juga memberikan peluang usaha perekonomian yang dapat digunakan dan dimanifestasikan sebagai penghasil sumber daya manusian(SDM) dan sumber daya alam (SDA) demi mencapai kesejahtraan. Edukasi terkait potensi yang dimiliki desa wisata untuk mengembangkan SDM danSDA yang dimiliki menjadi dasar dasar penggerak bagi masyarakat setempat. Pemahaman serta wawasan mengenai desa wisata dan berbagai macam peluang pekerjaan dalam mengembangkan perekonomian pada masyarkat setempatmenjaditujuanutama agar masyarakat dapat memahami mengapa diperlukan inovasi dalam pengembangan SDM dan SDA serta melihat dan menentukan potensi-potensi sebagai salah satu keberhasilan bersama. Pendekatan ABCD (Asset Based Community-driven Devlopment menjadi metode yang efektif untuk digunakan dalam pengembangan maksud tersebut, sebab pendekatan ini merupakan pengembangan masyarakat dalam upaya mengubah pola pikir atau mind set dengan mengarahkan mereka pada kesadaran bagaimana mengembangkan suatu aset/kekuatan yang dimiliki dengan berproses dalam pemberdayaan, dalam hal ini pemberdayaan desa wisata dan melihat potensi apa yang perlu dilaksanakan.
 
Normal zone in -coated conductors
We consider the distribution of an electric field in YBCO-coated conductors
for a situation in which the DC transport current is forced into the copper
stabilizer due to a weak link -- a section of the superconducting film with a
critical current less than the transport current. The electric field in the
metal substrate is also discussed. The results are compared with recent
experiments on normal zone propagation in coated conductors for which the
substrate and stabilizer are insulated from each other. The potential
difference between the substrate and stabilizer, and the electric field in the
substrate outside the normal zone can be accounted for by a large screening
length in the substrate, comparable to the length of the sample. During a
quench, the electric field inside the interface between YBCO and stabilizer, as
well as in the buffer layer, can be several orders of magnitude greater than
the longitudinal macroscopic electric field inside the normal zone. We
speculate on the possibility of using possible microscopic electric discharges
caused by this large (kV/cm) electric field as a means to detect a
quench.Comment: 8 pages, 4 figure
Finite-temperature effects on the superfluid Bose-Einstein condensation of confined ultracold atoms in three-dimensional optical lattices
We discuss the finite-temperature phase diagram in the three-dimensional
Bose-Hubbard (BH) model in the strong correlation regime, relevant for
Bose-Einstein condensates in optical lattices, by employing a quantum rotor
approach. In systems with strong on site repulsive interactions, the rotor U(1)
phase variable dual to the local boson density emerges as an important
collective field. After establishing the connection between the rotor
construction and the the on--site interaction in the BH model the robust
effective action formalism is developed which allows us to study the superfluid
phase transition in various temperature--interaction regimes
Limits on the Dipole Moments of the -Lepton via the Process $e^{+}e^{-}\to \tau^+ \tau^- \gamma in a Left-Right Symmetric Model
Limits on the anomalous magnetic moment and the electric dipole moment of the
lepton are calculated through the reaction at the -pole and in the framework of a left-right symmetric model.
The results are based on the recent data reported by the L3 Collaboration at
CERN LEP. Due to the stringent limit of the model mixing angle , the
effect of this angle on the dipole moments is quite small.Comment: 15 pages, 3 figure
Modelling the influence of peersâ attitudes on choice behaviour: theory and empirical application on electric vehicle preferences
While the importance of social influence on transport-related choices is commonly acknowledged within the transport and travel behaviour research community, there remain several challenges in modelling influence in practice. This paper proposes a new analytical approach to measure the effects of attitudes of peers on the decision making process of the individual. Indeed, while most of the previous literature focused its attention on capturing conformity to a certain real or hypothetical choice, we investigate the subtle effect of attitudes that underlies this choice. Specifically, the suggested measure enables us to model the correlated effect that might indirectly affect the individualâs choice within a social group. It combines detailed information on the attitudes in the individualâs social network and the social proximity of the individuals in the social network. To understand its behavioural implications on the individualâs choice, the individualâs peer attitude variable is tested in different components of a hybrid choice model. Our results show that the inclusion of this variable indirectly affects the decision making process of the individual as the peersâ attitudes are significantly related to the latent attitude of the individual. On the other hand, it does not seem to directly affect the utility of an alternative as a source of systematic heterogeneity nor does it work as a manifestation of the latent variable, i.e. as an indicator
Scaling property of the critical hopping parameters for the Bose-Hubbard model
Recently precise results for the boundary between the Mott insulator phase
and the superfluid phase of the homogeneous Bose-Hubbard model have become
available for arbitrary integer filling factor g and any lattice dimension d >
1. We use these data for demonstrating that the critical hopping parameters
obey a scaling relationship which allows one to map results for different g
onto each other. Unexpectedly, the mean-field result captures the dependence of
the exact critical parameters on the filling factor almost fully. We also
present an approximation formula which describes the critical parameters for d
> 1 and any g with high accuracy.Comment: 5 pages, 5 figures. to appear in EPJ
- âŠ