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Search Results: 1 - 10 of 191 matches for " BN;Riadh "
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Embryotoxicity following repetitive maternal exposure to scorpion venom
Hmed, BN;Riadh, B;Serria, H;Kamel, J;Khaled, Z;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2012, DOI: 10.1590/S1678-91992012000300009
Abstract: although it is a frequent accident in a few countries, scorpion envenomation during pregnancy remains scarcely studied. in the present study, the effects of repetitive maternal exposure to buthus occitanus tunetanus venom are investigated and its possible embryotoxic consequences on rats. primigravid rats received a daily intraperitoneal dose of 1 ml/kg of saline solution or 300 μg/kg of crude scorpion venom, from the 7th to the 13th day of gestation. on the 21st day, the animals were deeply anesthetized using diethyl-ether. then, blood was collected for chemical parameter analysis. following euthanasia, morphometric measurements were carried out. the results showed a significant increase in maternal heart and lung absolute weights following venom treatment. however, the mean placental weight per rat was significantly diminished. furthermore, blood urea concentration was higher in exposed rats (6.97 ± 0.62 mmol/l) than in those receiving saline solution (4.94 ± 0.90 mmol/l). many organs of venom-treated rat fetuses (brain, liver, kidney and spleen) were smaller than those of controls. on the contrary, fetal lungs were significantly heavier in fetuses exposed to venom (3.2 ± 0.4 g) than in the others (3.0 ± 0.2 g). subcutaneous blood clots, microphthalmia and total body and tail shortening were also observed in venom-treated fetuses. it is concluded that scorpion envenomation during pregnancy potentially causes intrauterine fetal alterations and growth impairment.
The Psychological Profile of Youth Male Soccer Players in Different Playing Positions  [PDF]
Amira Najah, Riadh Ben Rejeb
Advances in Physical Education (APE) , 2015, DOI: 10.4236/ape.2015.53020
Abstract: The purpose of this study was to investigate selected psychological skills of male youth soccer players in different playing positions. This study examined possible positional differences of 180 male youth Tunisian soccer players between the ages of 15 and 19 years old from different clubs of 1st and 3rd Youth Class divisions. The subjects were divided into three playing positions, namely, forward (n = 60), midfield (n = 60) and defense (n = 60), and compared with regard to twelve psychological skills measured by means of the Ottawa Mental Skills Assessment Tool (OMSAT-3) of Durand Bush et al. (2001). Results yielded significant differences between basic and psychosomatic subscale scores of the players in different playing positions. Forward players consistently outperformed the other positional groups in motivation, confidence and activation. Defense players outperformed the other positional groups in relaxation, while midfield players showed the lowest psychological skill levels. The results of the study provided support for the hypothesis that positional differences in terms of psychological skills existed. More specifically, statistical evidence suggested that youth soccer players could be differentiated as a function of psychological skill and the position that they played on the team.
A Study on the Determinants of Satisfaction with Hedonic Products
Riadh Ladhari
International Business Management , 2012,
Abstract: The purpose of this study is to analyze the interplaying role of cognitive and affective determinants of satisfaction. The proposed conceptual model suggests that perceived performance influences pleasure and arousal, arousal adds activation intensity to pleasure and performance and pleasure impact on satisfaction. The model is supported by the experience of 127 people who saw the 2002 science fiction movie Minority Report. Our results confirm prior findings on the role of affect in satisfaction and highlight the role of arousal as an amplifier of the effect of pleasure on satisfaction with hedonic products.
Strategies for Cultural Adaptation towards Solutions in Childhood Care Facility Design
BN Ifeanyi
African Research Review , 2009,
Abstract: Cultural Inheritance is an indispensable enduring facet of self- identity for both children and adults alike. It is the tradition, custom and way of life that guides and limits life practices. It is a common saying by cultural researchers that cultural understanding is normally established between ages five through to nine. Accommodation of cultural heritage in childhood care facility requires sensitive spatial organization and engagement of the physical environment to support culturally based activities and rituals. This paper outlined the importance of creating cultural reflective childhood care environments. It described the experiences of a design firm in creating schematic design for the model employer supported child care facility including cultural research process needed to create such and the application of cultural principles in a bid to finding solution against challenges encountered in childhood care facility design.
Achieving polio eradication in Nigeria: Prospects and challenges
BN Tagbo
Nigerian Journal of Paediatrics , 2013,
Abstract: The Global polio eradication initiative was launched in 1988 by the international community. Since then, tremendous progress has been made (99%). However, the last 1% of the journey has experienced several setbacks and rate of progress has slowed down in the last few years. Nigeria is one of the remaining 3 endemic countries in the world that has never interrupted the transmission of the poliovirus compared to more than 125 countries in 1988. What are the prospects and challenges to polio eradication in Nigeria? This paper discusses these and other relevant issues regarding polio eradication in Nigeria.
Epidemiology of blinding eye diseases in Cross River State, Nigeria as seen in University Of Calabar Teaching Hospital
BN Ekpenyong
Journal of the Nigerian Optometric Association , 2006,
Abstract: This study was to determine themagnitude anddistributionof blindingeye diseases in Cross River State. A total of 3903 case files of patients who visited the University of Calabar Teaching Hospital (UCTH) from January 2001-September 2003 were reviewed. Secondly 580 patients who visited the hospital within 3 months of the study period October 2003- December 2003 were examined and questionnaires administered on them. The overall prevalence of blindness during the study period was 9.2%. Cataract caused blindness in nearly half of the cases. Other important causes of blindness include refractive error, glaucoma, retinal/macular diseases and corneal diseases. The overall prevalence of these identified blinding eye diseases was 56.3%. Refractive error (62.8%)was the most prevalent followed by cataract (15.4%), glaucoma (11%), retinal/macular diseases (7%) and corneal disease (3.7%). Results of analysis have shown that the prevalence of blinding eye diseases depends on age, sex and occupation. Increasing age and being male characterized the prevalence of cataract, glaucoma and retinal/macular diseases. More females were seen to have refractive error while more males and children had corneal diseases.The prevalence of blinding eye diseases was also seen more among people that do out door jobs.
Lignite zone as an indicator to lost circulation belt: a case study of some locations of Anambra State, Southeastern Nigeria
BN Nfor
Journal of Applied Sciences and Environmental Management , 2006,
Abstract: Eighteen (18) water boreholes were studied for lost circulation. When locations of the boreholes associated with lost circulation were plotted on the map of Anambra State a lost circulation belt was observed around the River Niger – Onitsha – Oba – Nnewi axis. Lost circulation intervals range between 20-50m and 75-90m depth and were found to be associated with lignite and peaty clay members of the Ogwashi-Asaba Formation and/or the Ameki/Bende Formation. This suggests that natural rather than anthropogenic factors are responsible for the widespread occurrence of lost circulation in the State, although the latter could aggravate the former. Lignite and peaty clay of the Ogwashi-Asaba and Ameki/Bende Formation cause lost circulation because they are woody to earthy in nature and are easily eroded when they occur above the water table. These conditions favour the development of vugs, leading to increase in permeability and porosity, making the formation prone to lost circulation. Pre-drilling geophysical, geological and hydrogeological investigations are recommended, since these would go a long way to identify the presence or absence of lignite and thus help to avert possible lost circulation intervals. Journal of Applied Sciences and Environmental Management Vol. 10 (3) 2006: 31-35
De Nederlandsche bovenwindseilanden in het midden der 17de eeuw
Bn Mulert
Nieuwe West-Indische Gids , 1928,
Towards an Intelligent Predictive Model for Analyzing Spatio-Temporal Satellite Image Based on Hidden Markov Chain  [PDF]
Houcine Essid, Imed Riadh Farah, Vincent Barra
Advances in Remote Sensing (ARS) , 2013, DOI: 10.4236/ars.2013.23027

Nowadays remote sensing is an important technique for observing Earth surface applied to different areas such as, land use, urban planning, remote monitoring, real time deformation of the soil that can be associated with earthquakes or landslides, the variations in thickness of the glaciers, the measurement of volume changes in the case of volcanic eruptions, deforestation, etc. To follow the evolution of these phenomena and to predict their future states, many approaches have been proposed. However, these approaches do not respond completely to the specialists who process yet more commonly the data extracted from the images in their studies to predict the future. In this paper, we propose an innovative methodology based on hidden Markov models (HMM). Our approach exploits temporal series of satellite images in order to predict spatio-temporal phenomena. It uses HMM for representing and making prediction concerning any objects in a satellite image. The first step builds a set of feature vectors gathering the available information. The next step uses a Baum-Welch learning algorithm on these vectors for detecting state changes. Finally, the system interprets these changes to make predictions. The performance of our approach is evaluated by tests of space-time interpretation of events conducted over two study sites, using different time series of SPOT images and application to the change in vegetation with LANDSAT images.

Verification of Duration Systems Using an Approximation Approach
Riadh Robbana,

计算机科学技术学报 , 2003,
Abstract: We consider the verification problem of invariance properties for timed systems modeled by (extended) Timed Graphs with duration variables. This problem is in general case undecidable. Nevertheless we give in this paper a technique extending a given system into another one containing the initial computations as well as additional ones. Then we define a digitization technique allowing the translation from the continuous case to the discrete one. Using this digitization, we show that to each real computation in the initial system corresponds a discrete computation in the extended system. Then, we show that the extended system corresponds to a very close approximation of the initial one, allowing per consequent, a good analysis of invariance properties of the initial system.
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