Analyse cartographique des sites inondables dans la périphérie de la rivière Yolo à Ngaba

L’objectif de cette étude était d’étudier et analyser les activités anthropiques sur les deux rives de la riviere yolo dans l’axe des ponts munguludiaka et kianza situant dans la commune de Ngab

Secure Message System for Mobile Communication Using A5/1 Algorithm

The messaging system has become the most popular for mobile communication in the world. This paper is intended to implement secure messaging system for mobile communication. To encrypt / decrypt the message between the Mobile Station (MS) and the Base Transceiver Station (BTS), this system applies A5/1 algorithm. This system can be divided into two parts, uplink communication (MS to BTS) and downlink communication (BTS to MS).In this paper, two personal computers are used for BTS and other two personal computers are used for MS instead of real Mobile Station (MS).This system generates keystream before encryption and decryption process .It produces a unique (different) keystream for every frame throughout the call. Therefore this system can support data confidentiality and provide computationally fast and efficient through the use of the symmetric encryption

Reconstitution du couvert végétal et la revalorisation des terrains après la culture sur brûlis dans le district de Muang Fuang, province de Vientiane, R.D.P. Lao

Un problème crucial de la pratique de la culture itinérante sur brûlis dans un district du Laos, district de Muang Fuang, province de Vientiane, a été analysé. Les populations, composées des Lao, Khmou, Hmong et Yao, arrivant des zones environnantes à l'insécurité persistante et pratiquant ce système de culture dans leur ancien habitat, ont été étudiées de leur façon dans ces pratiques culturales ancestrales et les cultures permanentes : rizières inondées, plantations diverses pour l'utilisation locale, le marché du voisinage et l'exportation, incitées par le gouvernement en vue de remplacer progressivement la culture sur brûlis et de promouvoir leur sédentarisation. Les impacts de ces pratiques culturales sur la végétation originellement riche du type forêt dense semi-sempervirente ont été étudiés et ont permis de voir comment la forêt se reconstituait au bout d'une dizaine d'années et tendait vers la forêt climacique correspondant aux conditions écologiques de la région. En vue d'une amélioration économique de la région, les diverses possibilités de la revalorisation des terrains après la culture sur brûlis ont été examinées : installation de cultures pérennes, rizières irriguées ou inondées, exploitation des ressources naturelles, particulièrement des produits sous-forestiers. Ces diverses productions peuvent maintenant être commercialisées et exportées grâce au désenclavement routier de la région. Il en résulte un nouveau genre de vie pour les habitants devenus sédentaires et respectant l'environnement par l'abandon progressif de la culture itinérante sur brûlis.An analysis has been conducted of the crucial problem of shifting slash-and-burn cultivation in the Muang Fuang District of Laos, Vientiane Province. Studies were made on the peoples now living in the district, composed of Lao, Khmou, Hmong and Yao, who immigrated from nearby areas of persistent insecurity where they previously practiced this system of cultivation. The work focused on the traditional farming practices used by these groups, and on the permanent cultivation techniques now being used (flooded rice fields, and plantations of various crops for local use or for sale in markets and for export) with government encouragement in its effort progressively to replace shifting slash-and-burn agriculture with permanent settlement. An analysis of the impact of these agricultural practices on the vegetation, which was originally a rich, dense semi-evergreen tropical forest, shows that forest regenerates after about ten years, with a trend toward a climax forest type corresponding to the ecological conditions of the region. In order to improve the economy of the region, several possibilities were examined for improving land after shifting slash-and-burn agriculture: establishment of perennial cultivation, irrigated and flooded rice production, and natural resources exploitation, especially of non-timber forest products. This array of products can now be brought to market and exported via new roads built in the district. This has resulted in a new way of life for the inhabitants of the study area, who have become sedentary and are now respecting the environment by progressively abandoning shifting slash-and-burn agriculture.PARIS-Museum Hist.Naturelle (751052304) / SudocSudocFranceF

Dietary electrolyte balance for broiler chickens exposed to thermoneutral or heat-stress environments

Ross male broiler chicks (n = 480) on new litter were used in a randomized block design with two blocks (environmental rooms) and four treatments having four replicate pens (1.0 × 2.5 m; 15 chicks) each to evaluate dietary electrolyte balance (DEB; P < 0.05). Two rooms were 1) thermoneutral (Weeks 1 through 6, with decreasing maximum from 32 to 25°C and minimum from 28 to 19°C; relative humidity 49 to 58%) and 2) cyclic daily heat stress (Weeks 1 and 2, thermoneutral; Weeks 2 through 6, maximum temperatures 35, 35, 33, and 33°C, respectively; and minimum temperatures 23, 20, 19, and 19°C, respectively; relative humidity 51 to 54%). The DEB treatments (0, 140, 240, or 340 mEq Na + K - Cl/kg) had NaHCO3 plus NH4Cl, or KHCO3, or both added to corn-soybean meal mash basal diets with 0.30% salt (NaCl). In the thermoneutral room, DEB 240 increased 42-d weight gain and 44-d lymphocyte percentage and decreased heterophil percentage and heterophil to lymphocyte ratio compared to the DEB 40 treatment. The DEB 240 diets had 0.35 and 0.35% Na and 0.37% and 0.29% Cl in starter (0.75% K) and grower (0.67% K) diets, respectively. No DEB treatment differences were found in the heat stress room. For combined rooms, 42-d feed intake was higher for DEB 240 than for DEB 40. The 21-d weight gain was higher for DEB 240 than for DEB 40 or 140; and 21-d feed/gain was lower for DEB 40 than for DEB 340. The predicted maximum point of inflection for 21- and 42-d weight gains were DEB 250 and 201, with highest 42-d feed intake at 220.Department of Zootecnia FCAV/UNESP, Rodovia Carlos Tonanni km 05, Jaboticabal, CEP 14870-000, S. PauloHooge Consulting Service, Inc., 8775 North Cedar Pass Road, Eagle Mountain, UTChurch and Dwight Company, Inc., 469 North Harrison Street, Princeton, NJ 08543-5297Department of Zootecnia FCAV/UNESP, Rodovia Carlos Tonanni km 05, Jaboticabal, CEP 14870-000, S. Paul