A distinguishing feature of hypermedia applications is the possibility of navigational access by the user. Although this type of access can be an advantage, there many problems associated with it, for example user disorientation ("lost in hyperspace"). This paper presents the concept of navigational context, which is used to design the navigation structure of a hypermedia application. Navigatio...

Jesus’ kind of leaders have influence because they are learners. Their classwork with The Rabbi is never dismissed. Jesus invites, “Take my yoke upon you and learn from me, for I am gentle and humble in heart...” (Matt. 11:29, italics mine). Because the “take my yoke” command gets more attention than the “learn from me” command, it’s worth considering a few points as to how learning relates to ...

Maloney and Ahumada [9] have proposed a network learning algorithm that allows the visual system to compensate for irregularities in the positions of its photoreceptors. Weights in the network are adjusted by a process tending to make the internal image representation translationinvariant. We report on the behavior of this translation-invariance algorithm calibrating a visual system that has lo...

Both nulling and subpulse drifting are poorly understood phenomena. We probe their mechanisms by investigating how they interact in PSR B0809+74. We find that the subpulse drift is not aliased but directly reflects the actual motion of the subbeams. The carousel-rotation time must then be over 200 s, which is much longer than theoretically predicted. The drift pattern after nulls differs from t...

INTRODUCTION Skin of cattle is often affected by Stephano-filarial infection in the Indian subcontinent and is commonly known as ‘Humpsore’. Nine species of the Stephanofilarial parasites have been reported from different parts of the world, but only Stephanofilaria assamensis has been reported as the causal agent of hump sore in eastern India. Though the name ‘Hump sore’ implies appearance of ...

The Petrova (2000) model to calculate pulse profiles is extended to a variable emission height model to make it physically self-consistent. In this context variable means that the emission height is no longer considered to be the same for different magnetic field lines. The pulse profiles calculated using this new model seem to be less realistic due to a focusing effect and cannot be used to fi...

The breakdown of Lorentz’s and CPT invariance, as described by the Extension of the Standard Model, gives rise to a modification of the dispersion relation of particles. Consequences of such a modification are reviewed in the framework of pulsar kicks induced by neutrino oscillations (activesterile conversion). A peculiar feature of the modified energy-momentum relations is the occurrence of te...

X–rays are detected from the pulsar–Be star binary PSR 1259−63 only after apastron passage. We suggest that the X–rays result from accretion on to the pulsar magnetosphere of matter captured from the Be star wind. The capture efficiency changes markedly at this phase, in line with the observations, provided that the wind is slow (∼ sonic) at large distances from the Be star. Accepted by The Ast...

In this paper, we present a study of orthogonal polarization modes in the radio emission of PSR B1133+16, conducted within the frame of simultaneous, multi-frequency, single-pulse observations. Simultaneously observing at two frequencies (1.41 GHz and 4.85 GHz) provides the means to study the bandwidth of polarization features such as the polarization position angle. We find two main results. F...

It is no longer necessary to “sell” the idea of pulsar kicks, the notion that neutron stars receive a large velocity (a few hundred to a thousand km s) at birth. However, the origin of the kicks remains mysterious. We review the physics of different kick mechanisms, including hydrodynamically driven, neutrino and magnetically driven kicks.