Although recent studies have brought new insight into the mechanisms of spatial memory and cognitive strategies during navigation, most of these studies have concerned two-dimensional navigation and little is known regarding the problem of three-dimensional (3D) spatial memory. We found previously that memorizing complex 3D-structured corridors was easier with natural self-motion that included ...

In [l] Bagchi and Bagchi conjectured that one of the hypotheses of their theorem 2(d) is superfluous. This turns out to be true: PROPOSITION. Let 4 = 9 mod 16 be a prime power such that 2 is a fourth power in Fq. Then 1 f fi are nonsquares in Fp. Pruc$ Let p be a primitive eighth root of unity in Fq (note that /3 is a nonsquare). Because of (02 + 1)2 = p4 + 202 + 1 = 202 we obtain that (0 * + 1...

A model combining low-frequency complex conductivity and high-frequency permittivity is developed in the frequency range from 1 mHz to 1 GHz. The low-frequency conductivity depends on pore water and surface conductivities. Surface conductivity is controlled by the electrical diffuse layer, the outer component of the electrical double layer coating the surface of the minerals. The frequency depe...

BACKGROUND High prevalence of depression among primary care patients has increased the need for more research in this field. The objectives of our study were to analyse how depressed patients evaluate their health; which co-morbid diseases are associated with depression; how depression influences the patients' consultation rate in family practice (FP); how disability is associated with depressi...

The paper presents and describes a solution for on-line, in-situ automatic cleaning and calibration of stand alone sensors that measure quantities used in the assessment of rivers and lakes water quality. The system, which was also designed to extract water samples for measurement, includes a set of pumps and electro-valves that are controlled by a microcontroller (PIC17C752) based unit. The co...

This research aims to identify and describe the thinking process of students in solving mathematical problems, both who have a field-independent type cognitive style (GK-FI) field-dependent (GK-FD). The subjects this study were eight people, consisting four GK-FI GK-FD students. Data was collected using Group Embedded Figure Test (GEFT). selecting carried out stages (a) determining class be sub...

ions supplémentaires, nous pouvons synthétiser l’écriture de plusieurs objectifs de test en un schéma de test. Un schéma de test est une abstraction d’objectifs de test. Nous présentons maintenant les différentes abstractions proposées avant d’étudier comment nous pouvons exprimer la couverture des schémas de test vis-à-vis de la spécification. Avant de présenter les différentes abstractions, n...

Let f(d) = (fs, fi, . . . . fd,) be the f-vector of a Cohen-Macaulay complex A. Bjijrner proved that (*) fief++, for any O<ii[d/2] and (**) f0 Q fi < < fr+ i rP1. Recently, Stanley generalized Bjorner’s inequalities (*) and (**) for pure simplicial complexes. In this paper we consider O-sequence analogue of the inequalities (*) and (**). Let (ha, h,, . . . . h,), h,#O, is a pure O-sequence. We ...