A one–parameter family of five dimensional nonfactorisable spacetimes is discussed. These spacetimes have Ricci scalar, R = 0. The warp factors, in general, are asymmetric (i.e. different warp factors for the spatial and temporal parts of the 3–brane section), though, with a specific choice of a parameter (denoted here by ν), the asymmetry can be avoided. Over a range of values of ν the energy ...

SIAM J. Matrix Anal Appl. 26 (2005) 748–757 Abstract. Let R ∈ C and S ∈ C be nontrivial involutions; i.e., R = R 6= ±Im and S = S 6= ±In. We say that A ∈ C is (R,S)-symmetric ((R,S)-skew symmetric) if RAS = A (RAS = −A). We give an explicit representation of an arbitrary (R,S)-symmetric matrix A in terms of matrices P andQ associatedwith R and U and V associatedwith S. If R = R, then the least ...

This paper presents a cognitive model that simulates how the reliance on automation in a simple tracking task, which represents vehicle operation, changes as the success probabilities of automatic and manual mode vary. The model was developed by using ACT-R, and we also introduce three methods of reinforcement learning: the synchronization of utilities in the same mode, the summation of rewards...

In this work we define a scalar product " weighted " with the scalar factor R and show how to find a normalized wave function for the supersymmetric quantum FRW cosmological model using the idea of supersymmetry breaking selection rules under local n=2 conformal supersymmetry. We also calculate the expectation value of the scalar factor R in this model and its corresponding behaviour.

The number and diameter of strands to minimize loss in a litz-wire transformer winding is determined. With fine stranding, the ac resistance factor can be decreased, but dc resistance increases as a result of the space occupied by insulation. A power law to model insulation thickness is combined with standard analysis of proximity-effect losses to find the optimal stranding. Suboptimal choices ...

ABSTRACT: Recently, limit state design (LSD) in geotechnical engineering has been developed through LRFD in North America and Eurocode 7 in Europe. LRFD is an approach that estimates resistance by design model and that multiplies resistance factor by calculated resistance to reflect the uncertainty of materials and design models. Whereas, Eurocode 7 employs the partial resistance factor applied...

This paper describes the development of a parameterized model for a small-scale unmanned helicopter (Yamaha R-50 with 10 ft rotor diameter) and its identification using a frequency domain identification technique. The model explicitly accounts for the stabilizer bar, which has a strong influence on the flight dynamics characteristics. The accuracy of the identified model is verified by comparin...

In this paper, we compile the network of software packages with regulatory interactions (dependences and conflicts) from Debian GNU/Linux operating system and use it as an analogy for a gene regulatory network. Using a trace-back algorithm we assemble networks from the pool of packages with both scale-free (real data) and exponential (null model) topologies. We record the maximum number of pack...

With the Basel ban, imposing restrictions on Trans-boundary movement of hazardous wastes, coming into force with effect from 1.1.1998, the concept of treatment and safe disposal of hazardous wastes (HWs) assumes paramount significance. The annual HW generation in India is estimated at 0.3-0.5 million tonnes. As per the ideal industrial siting criteria in India, the industry should have enough l...

background : the implementation of hse programs is so complicated in tunneling industry which is considered as one of the risky industries. this study aims at investigating the relationship between employees' safety attitudes and status of their belief in destiny, chance and perceived importance of hse programs in occurrence of occupational accidents. methods : this research is a cross-sectiona...