4 résultat(s) recherche sur le tag 'Forest'    

Cartographie de la variabilité thermique des écosystèmes forestiers de l’Est algérien / Ahmed Laala  

Public ISBD Titre : Cartographie de la variabilité thermique des écosystèmes forestiers de l’Est algérien Type de document : texte imprimé Auteurs : Ahmed Laala, Auteur ; Djamel Alatou, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 212 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Variabilité  Température  Forêt  NDVI  SIG  MODIS  Est algérien  Cartographie  Variability  Temperature  Forest  GIS  , Eastern Algeria  Cartography  ????????  ???????  ??????  ???? ?????? ??????? ??????  ???? ????????? ????????  ????? ??????? MODIS  ??? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : Algerian forest patrimony is estimated at 4 million hectares, including forests, Scrub and brush. This forest is exposed to natural and anthropogenic hazards that cause severe degradation resulting mainly in continued regressive evolution and a ubstantial loss of wealth. Among the natural threats is the climate conditions and particularly the temperature of the environment in which forest ecosystems evolve. In addition to its action on life processes, on growth and on phenology of species, temperature can change also the biogeographic areas of ecosystems. In this study we analyzed the temperature to characterize the thermal environment of eastern Algeria and the effects of its variation on the dynamics and photosynthetic activity of forest ecosystems in this vast area. The used data is the temperatures for a period of 30 consecutive years (1982-2011) and spectral index (NDVI) which can detect the photosynthetic signal above the canopy. Statistical analysis of long temperature series reveals that the warming observed worldwide is already noticed in eastern Algeria. The majority of the wilayas exposed to this hazard, where the trend is more pronounced for the annual maximum temperature, may reach 3 °C/30years, an increase of 0.1C°/year. Thus, the estimate of thermal field for each pixel in eastern Algeria was realized by using Geostatistical methods based on multiple regression between temperature and the explanatory variables describing the relief. From these spatial data, the thermal limits have been defined for each forest species. Finally, the technical of GIS and satellite images allowed us to monitor the dynamics of forest vegetation, and to build maps that define the relationship between forest biomass and thermal parameters. These maps helped us to identify 901087 hectares where trees were very sensitive to changes in the average temperature, with a percentage of 53.9% of the total area of the studied forest ecosystems. Thus, the minimum temperature affects photosynthesis of forest species in an area of 852406 ha with 50.8% of the total forest area. This cartographic expression is effective, firstly for forestry in the discrimination of forest plots where the thermal factor is the limiting factor of productivity and secondly for decision makers to define the forest management strategies of country. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/LAA6983.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10412 Cartographie de la variabilité thermique des écosystèmes forestiers de l’Est algérien [texte imprimé] / Ahmed Laala, Auteur ; Djamel Alatou, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 212 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Variabilité  Température  Forêt  NDVI  SIG  MODIS  Est algérien  Cartographie  Variability  Temperature  Forest  GIS  , Eastern Algeria  Cartography  ????????  ???????  ??????  ???? ?????? ??????? ??????  ???? ????????? ????????  ????? ??????? MODIS  ??? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : Algerian forest patrimony is estimated at 4 million hectares, including forests, Scrub and brush. This forest is exposed to natural and anthropogenic hazards that cause severe degradation resulting mainly in continued regressive evolution and a ubstantial loss of wealth. Among the natural threats is the climate conditions and particularly the temperature of the environment in which forest ecosystems evolve. In addition to its action on life processes, on growth and on phenology of species, temperature can change also the biogeographic areas of ecosystems. In this study we analyzed the temperature to characterize the thermal environment of eastern Algeria and the effects of its variation on the dynamics and photosynthetic activity of forest ecosystems in this vast area. The used data is the temperatures for a period of 30 consecutive years (1982-2011) and spectral index (NDVI) which can detect the photosynthetic signal above the canopy. Statistical analysis of long temperature series reveals that the warming observed worldwide is already noticed in eastern Algeria. The majority of the wilayas exposed to this hazard, where the trend is more pronounced for the annual maximum temperature, may reach 3 °C/30years, an increase of 0.1C°/year. Thus, the estimate of thermal field for each pixel in eastern Algeria was realized by using Geostatistical methods based on multiple regression between temperature and the explanatory variables describing the relief. From these spatial data, the thermal limits have been defined for each forest species. Finally, the technical of GIS and satellite images allowed us to monitor the dynamics of forest vegetation, and to build maps that define the relationship between forest biomass and thermal parameters. These maps helped us to identify 901087 hectares where trees were very sensitive to changes in the average temperature, with a percentage of 53.9% of the total area of the studied forest ecosystems. Thus, the minimum temperature affects photosynthesis of forest species in an area of 852406 ha with 50.8% of the total forest area. This cartographic expression is effective, firstly for forestry in the discrimination of forest plots where the thermal factor is the limiting factor of productivity and secondly for decision makers to define the forest management strategies of country. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/LAA6983.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10412

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
LAA/6983	LAA/6983	Thèse	Bibliothèque principale	Thèses	Disponible

Causes et conséquences des feux de forêts sur la production du liège dans les subéraies du Nord-Est algérien / Imane Bouregbi  

Public ISBD Titre : Causes et conséquences des feux de forêts sur la production du liège dans les subéraies du Nord-Est algérien : Essai de valorisation et réhabilitation Type de document : texte imprimé Auteurs : Imane Bouregbi, Auteur ; Mohamed El-Habib Benderredji,, Auteur Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 183 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Incendie  forêt  chêne liège  liège  massifs  subéraies  restauration  sauvegarde  fire  forest  Cork oak  cork  mountains  Cork oak forests  restoration  safeguard  ???????  ?????? ??????? ??????  ?????  ?????? ??????? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : The assessment of forest fires (1975-2013) established in the mountains of Eastern Algeria, shows that the cork oak remains the essence most affected compared to other species, with a burned area of 126,412.88 ha (48%). This region is highly affected by wildfires since recorded a cumulative 18,732 fires, degrading a total forest area of 635,471.55 hectares. The causes attributed to the outbreak of fires are divers . But it seems that the climate factor is the root cause of all disasters. The floristic forest also has a great influence on the development of fire. While 70% of registered claims originate from the human factor. Analysis of the impact of forest fires shows that there is a strong negative correlation between the production of cork, the starting number of fires and the area burned. Examining the evolution of the cork oak survival after passage of fire revealed as snuff into account in forest Collo observations stations, the rate of tree mortality is based on their age so démasclage bark cork. On the other hand during the recovery of our parcels covered by the fires was addressing the themes of economic type and forest type and the choice of intervention was so as to seek the restoration of the tree layer using crop sizes performed immediately after the passage of the fire, with priority to the cork forests and future productions. Diplôme : Magistère En ligne : ../theses/biologie/BOU6648.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9800 Causes et conséquences des feux de forêts sur la production du liège dans les subéraies du Nord-Est algérien : Essai de valorisation et réhabilitation [texte imprimé] / Imane Bouregbi, Auteur ; Mohamed El-Habib Benderredji,, Auteur . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2014 . - 183 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Incendie  forêt  chêne liège  liège  massifs  subéraies  restauration  sauvegarde  fire  forest  Cork oak  cork  mountains  Cork oak forests  restoration  safeguard  ???????  ?????? ??????? ??????  ?????  ?????? ??????? ??????? Index. décimale : 570 Sciences de la vie. Biologie Résumé : The assessment of forest fires (1975-2013) established in the mountains of Eastern Algeria, shows that the cork oak remains the essence most affected compared to other species, with a burned area of 126,412.88 ha (48%). This region is highly affected by wildfires since recorded a cumulative 18,732 fires, degrading a total forest area of 635,471.55 hectares. The causes attributed to the outbreak of fires are divers . But it seems that the climate factor is the root cause of all disasters. The floristic forest also has a great influence on the development of fire. While 70% of registered claims originate from the human factor. Analysis of the impact of forest fires shows that there is a strong negative correlation between the production of cork, the starting number of fires and the area burned. Examining the evolution of the cork oak survival after passage of fire revealed as snuff into account in forest Collo observations stations, the rate of tree mortality is based on their age so démasclage bark cork. On the other hand during the recovery of our parcels covered by the fires was addressing the themes of economic type and forest type and the choice of intervention was so as to seek the restoration of the tree layer using crop sizes performed immediately after the passage of the fire, with priority to the cork forests and future productions. Diplôme : Magistère En ligne : ../theses/biologie/BOU6648.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9800

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
BOU/6648	BOU/6648	Thèse	Bibliothèque principale	Thèses	Disponible

Etude et conception d’antennes à résonateurs diélectriques / Abla Behloul èp Bachkhaznadji  

Public ISBD Titre : Etude et conception d’antennes à résonateurs diélectriques : Application à la réalisation d’une antenne reconfigurable Type de document : texte imprimé Auteurs : Abla Behloul èp Bachkhaznadji, Auteur ; Abdelmadjid Benghalia, Directeur de thèse ; Tayeb A Denidni, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 100 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Electronique Tags : Antennes à résonateur diélectrique  méthode des différences finies dans le domaine temporel (FDTD)  effet de couplage  antenne reconfigurable en diagramme de rayonnement  Variability  Temperature  Forest  NDVI  GIS  MODIS  Eastern Algeria  Cartography  ????? ?? ???? ????  ????? ?????? ???????? ?? ?????? ?????? (FDTD)  ????? ????? ????? ??? ??????? ? ????? ???????? Index. décimale : 621 Electronique Résumé : This work consists of a contribution to the modeling and the conception of dielectric resonator antennas with application to the realization of reconfigurable antenna. The dielectric resonator antennas are important antenna for the flexibility and the ease of integration in wireless systems (WLAN), where they allow to use several shapes (rectangular, triangular,etc) and several power supplies (coupling slot, coaxial cable,etc.). We are also interested by the coupling effect due to the presence of another antenna or a presence of a coupling slot. The calculated program based on the FDTD method to modeling a dielectric resonator antenna, we enable to calculate the reflection coefficient, the input impedance electrical and the magnetic fields. The HFSS simulator is used to validate these results. Then, this study has been extended to the conception and the fabrication of a reconfigurable dielectric resonator antenna. For this purpose, we studied and simulated a reconfigurable antenna structure by using two simulator (HFSS, CST), then we proposed another structure which is a triangular reconfigurable dielectric resonator antenna simulated by CST simulator and fabricated in RF laboratory, of the National Institute of Scientific Research, INRS, Canada. The numerical results are presented in terms of the reflection coefficient, radiation pattern, gain, and efficiency. In addition, we have studied an dielectric resonator antenna with reconfigurable by diodes PIN. Two distinct radiation patterns were obtained by maintaining the same resonance frequency, which shows that the insertion of electrically-driven semiconductor components into the antenna base structure provides an effective means for reconfigurability of the radiation Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BEH7084.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10517 Etude et conception d’antennes à résonateurs diélectriques : Application à la réalisation d’une antenne reconfigurable [texte imprimé] / Abla Behloul èp Bachkhaznadji, Auteur ; Abdelmadjid Benghalia, Directeur de thèse ; Tayeb A Denidni, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 100 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Electronique Tags : Antennes à résonateur diélectrique  méthode des différences finies dans le domaine temporel (FDTD)  effet de couplage  antenne reconfigurable en diagramme de rayonnement  Variability  Temperature  Forest  NDVI  GIS  MODIS  Eastern Algeria  Cartography  ????? ?? ???? ????  ????? ?????? ???????? ?? ?????? ?????? (FDTD)  ????? ????? ????? ??? ??????? ? ????? ???????? Index. décimale : 621 Electronique Résumé : This work consists of a contribution to the modeling and the conception of dielectric resonator antennas with application to the realization of reconfigurable antenna. The dielectric resonator antennas are important antenna for the flexibility and the ease of integration in wireless systems (WLAN), where they allow to use several shapes (rectangular, triangular,etc) and several power supplies (coupling slot, coaxial cable,etc.). We are also interested by the coupling effect due to the presence of another antenna or a presence of a coupling slot. The calculated program based on the FDTD method to modeling a dielectric resonator antenna, we enable to calculate the reflection coefficient, the input impedance electrical and the magnetic fields. The HFSS simulator is used to validate these results. Then, this study has been extended to the conception and the fabrication of a reconfigurable dielectric resonator antenna. For this purpose, we studied and simulated a reconfigurable antenna structure by using two simulator (HFSS, CST), then we proposed another structure which is a triangular reconfigurable dielectric resonator antenna simulated by CST simulator and fabricated in RF laboratory, of the National Institute of Scientific Research, INRS, Canada. The numerical results are presented in terms of the reflection coefficient, radiation pattern, gain, and efficiency. In addition, we have studied an dielectric resonator antenna with reconfigurable by diodes PIN. Two distinct radiation patterns were obtained by maintaining the same resonance frequency, which shows that the insertion of electrically-driven semiconductor components into the antenna base structure provides an effective means for reconfigurability of the radiation Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BEH7084.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10517

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
BEH/7084	BEH/7084	Thèse	Bibliothèque principale	Thèses	Disponible

Étude des gènes de prédisposition aux cancers colorectaux / Hedia Ziada-Bouchaar  

Public ISBD Titre : Étude des gènes de prédisposition aux cancers colorectaux : Syndrome de Lynch Type de document : texte imprimé Auteurs : Hedia Ziada-Bouchaar, Auteur ; Nourredine Abadi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 157 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Familles algériennes  HNPCC  Syndrome de Lynch  MLH1  MSH2  gènes MMR  Variability  Temperature  Forest  , NDVI  GIS  MODIS  Eastern Algeria  Cartography  ???????? ?????????  ??????? ???????? ????????? ??????? ???? ?????  ??????? ????  MLH1? MMR Index. décimale : 570 Sciences de la vie. Biologie Résumé : Colorectal cancer (CRC) is currently a major public health problem in Algeria. Among the hereditary forms of this cancer, Hereditary Non-Polyposis Colorectal Cancer (HNPCC) is an autosomal dominant disorder characterized by the early onset of CRC. This syndrome is linked to germline defects in Mismatch Repair (MMR) genes. The work we have done has been devoted to studying the molecular correlation between CRC and mutations occurring in the MLH1, MSH2 and MSH6 repair genes in 27 unrelated Algerian families. The search for germline mutations was tested by sequencing all exons and adjacent intronic sequences. Multiplex ligand-dependent probe amplification (MLPA) technique was used for testing large genomic rearrangements (deletion / duplication), when we observed no point mutations. Pathogenic mutations were identified in 15 % of families with clinical suspicion on HNPCC. Two novel variants described for the first time in Algerian families were identified in MLH1, c.881_884delTCAGinsCATTCCT and a large deletion in MSH6 gene from a young onset of CRC. Moreover, the variants of MSH2 gene: c.942+3A>T et c.1030C>T, the most described ones, were also detected in our families. Furthermore, the families HNPCC caused by MSH6 germline mutation may show an age of onset that is comparable to this of patients with MLH1 and MSH2 mutations. According to our results, we confirmed that MSH2, MLH1, and MSH6 contribute to CRC susceptibility. This work represents the implementation of a diagnostic algorithm for the identification of Lynch syndrome patients in Algerian families, which can assist in the management of these patients and the medical supervision of their relatives at risk. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/ZIA7080.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10521 Étude des gènes de prédisposition aux cancers colorectaux : Syndrome de Lynch [texte imprimé] / Hedia Ziada-Bouchaar, Auteur ; Nourredine Abadi, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 157 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Familles algériennes  HNPCC  Syndrome de Lynch  MLH1  MSH2  gènes MMR  Variability  Temperature  Forest  , NDVI  GIS  MODIS  Eastern Algeria  Cartography  ???????? ?????????  ??????? ???????? ????????? ??????? ???? ?????  ??????? ????  MLH1? MMR Index. décimale : 570 Sciences de la vie. Biologie Résumé : Colorectal cancer (CRC) is currently a major public health problem in Algeria. Among the hereditary forms of this cancer, Hereditary Non-Polyposis Colorectal Cancer (HNPCC) is an autosomal dominant disorder characterized by the early onset of CRC. This syndrome is linked to germline defects in Mismatch Repair (MMR) genes. The work we have done has been devoted to studying the molecular correlation between CRC and mutations occurring in the MLH1, MSH2 and MSH6 repair genes in 27 unrelated Algerian families. The search for germline mutations was tested by sequencing all exons and adjacent intronic sequences. Multiplex ligand-dependent probe amplification (MLPA) technique was used for testing large genomic rearrangements (deletion / duplication), when we observed no point mutations. Pathogenic mutations were identified in 15 % of families with clinical suspicion on HNPCC. Two novel variants described for the first time in Algerian families were identified in MLH1, c.881_884delTCAGinsCATTCCT and a large deletion in MSH6 gene from a young onset of CRC. Moreover, the variants of MSH2 gene: c.942+3A>T et c.1030C>T, the most described ones, were also detected in our families. Furthermore, the families HNPCC caused by MSH6 germline mutation may show an age of onset that is comparable to this of patients with MLH1 and MSH2 mutations. According to our results, we confirmed that MSH2, MLH1, and MSH6 contribute to CRC susceptibility. This work represents the implementation of a diagnostic algorithm for the identification of Lynch syndrome patients in Algerian families, which can assist in the management of these patients and the medical supervision of their relatives at risk. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/ZIA7080.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10521

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
ZIA/7080	ZIA/7080	Thèse	Bibliothèque principale	Thèses	Disponible