Good user interfaces cannot be built on top of representations that ignore cogni-tive issues. This is particularly true for the representation of spatial knowledge, since space plays a preponderant role in human cognition. In this paper, we lay down the theoretical framework for a qualitative representation of space that takes cognitive aspects into consideration. A Knowledge Representation Mod...

We study four-dimensional black hole configurations which result from wrapping M5-branes on a Calabi-Yau manifold, as well as Udual realizations. Our aim is to understand the microscopic degrees of freedom responsible for the existence of bound states of multiple branes. The details depend on the chosen U-frame; in some cases, they are massless string junctions. We also identify a perturbative ...

Case report We present the case of a 41 year-old male, diagnosed with syphilitic encephalitis, in whom cerebral magnetic resonance imaging demonstrated preponderant involvement of bilateral temporal lobes, for this point of view raising differential diagnostic concerns with Herpes virus encephalitis. We also identified multiple encephalitis foci: hippocampus, lentiform nucleus, left thalamus, l...

Regional cerebral blood flow was investigated using single photon emission computed tomography and xenon-133 intravenous injection in six patients with dementia of the Alzheimer type (DAT) with atypical focal clinical presentation, and in 20 age-matched healthy volunteers. The patients had a progressive and preponderant cognitive deficit and a focal hypoperfusion that correlated with the neurop...

Small and informal enterprises are preponderant in Africa’s manufacturing sector. Their growth is negligibly low except when young and small, but little is known beyond this. This paper reports the results of our field study of a metalworking cluster in Nairobi. As competition was intensified by the entry of new enterprises, the education level of entrepreneurs became important in determining e...

Rigorous alkaline hydrolysis of the two primary (cholic and chenodeoxycholic) and of the two preponderant secondary (deoxycholic and lithocholic) bile acids found in bile led to excellent recoveries. Such was not the case with 11 different keto bile acid standards. Recoveries for a number of standards were unacceptably low and a variety of artefactural products were tentatively identified by ga...

Synovial or ganglion cysts are uncommon lesions that may occur within the spinal canal. Over 50 reported cases have demonstrated a preponderant incidence at the L4-L5 level in association with degenerative hypertrophic facet changes ( 1, 2). The typical computed tomography (CT) appearance is that of an epidural lowdensity lesion adjacent to the degenerated facet joint that may or may not have a...

Many of our investigations involving adrenal physiology have been carried out in the rat (14). Since corticosterone is the preponderant adrenal steroid found in rat plasma, l it became essential to develop a rapid, valid method for its determination. The Silber-Porter method (5) is inadequate for studies in the rat because it is neither sensitive nor specific enough. The method of Sweat (B), al...

Abstract Citral is a key component of lemon scented essential oils. In our aromatic plant breeding programs it is necessary to rapidly screen hundreds of samples for their citral content. The current method based on GLC analysis is expensive and time consuming. Here, we describe a colorimetric method for citral determination based on the Schiff’s reaction of citral. The method is rapid, reprodu...

Anxiety depression is the commonest phenomena in preponderant population. Many individuals might have experience it and still not know, very often a state of constant denial negligence with fact knowingly. The causes can vary from psychological, physiological traumatic past experiences. This article incorporate studies anxietydepression their relationship causes. are most common psychological d...