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Partager le résultat de cette recherche Interroger des sources externesCartographie de la variabilité thermique des écosystèmes forestiers de l’Est algérien. / Ahmed Laala
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
BiologieTags : Ecologie végétale:Ecophysiologie et biotechnologie végétale Variabilité Température Forêt NDVI SIG MODIS Est algérien Cartographie Variability Temperature Forest GIS , Eastern Algeria Cartography التغيرات الحرارة الغابة مؤشر الغطاء النباتي الخضري نظام المعلومات الجغرافي القمر الصناعي MODIS شرق الجزائر رسم الخرائط 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 : Permalink : 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 . - جامعة الإخوة منتوري قسنطينة, 2016 . - 212 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Ecologie végétale:Ecophysiologie et biotechnologie végétale Variabilité Température Forêt NDVI SIG MODIS Est algérien Cartographie Variability Temperature Forest GIS , Eastern Algeria Cartography التغيرات الحرارة الغابة مؤشر الغطاء النباتي الخضري نظام المعلومات الجغرافي القمر الصناعي MODIS شرق الجزائر رسم الخرائط 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 : Permalink : 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
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
BiologieTags : Incendie forêt chêne liège liège massifs subéraies restauration sauvegarde fire forest Cork oak cork mountains Cork oak forests restoration safeguard الحرائق الغابات البلوط الفلیني الفلین غابات البلوط الفلیني استرجاع حمایة 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 : Permalink : 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 [Algérie] : Université Constantine 1, 2014 . - 183 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Incendie forêt chêne liège liège massifs subéraies restauration sauvegarde fire forest Cork oak cork mountains Cork oak forests restoration safeguard الحرائق الغابات البلوط الفلیني الفلین غابات البلوط الفلیني استرجاع حمایة 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 : Permalink : 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
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
ElectroniqueTags : 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 هوائي رو رنان عازل طريقة الفروق المحذودة في المجال انسمني (FDTD) هوائي اعادة تشكيم نمط
الاشعاع و تاثير الاقترانIndex. 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 : Permalink : 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 . - جامعة الإخوة منتوري قسنطينة, 2017 . - 100 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : 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 هوائي رو رنان عازل طريقة الفروق المحذودة في المجال انسمني (FDTD) هوائي اعادة تشكيم نمط
الاشعاع و تاثير الاقترانIndex. 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 : Permalink : 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
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
BiologieTags : Familles algériennes HNPCC Syndrome de Lynch MLH1 MSH2 gènes MMR Variability Temperature Forest , NDVI GIS MODIS Eastern Algeria Cartography العائلات الجزائرية السرطان القولوني المستقيمي الوراثي بدون زوائد متلازمة لينش MLH1و 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 : Permalink : 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 . - جامعة الإخوة منتوري قسنطينة, 2017 . - 157 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : Familles algériennes HNPCC Syndrome de Lynch MLH1 MSH2 gènes MMR Variability Temperature Forest , NDVI GIS MODIS Eastern Algeria Cartography العائلات الجزائرية السرطان القولوني المستقيمي الوراثي بدون زوائد متلازمة لينش MLH1و 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 : Permalink : 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
