Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.430-450
G. Issa, Prepis Alkiviadis
Taking into consideration the increasing need to define the chronology of the churches based on their architectural elements.This paper primarily aims to develop a wider understanding of ecclesiastical characteristics;this is exactly why anindispensable analysis was carried out to understand these architectural features and to make them easily recognizable.Furthermore, this research is an attempt to monitor how the different morphological characteristics of churches affectthe general chronology.For the study of the churches, the methodology of investigation of the architectural elementswas used.This tool of investigation has been applied to the direct analysis of morphological evidencefor a better understandingand to clarify its relationship with the chronology.Thisstudy relates to ecclesiastical templesfrom the 8th century to the 13th centuryin Koura, Batroun and Byblos. Unfortunately, there are no remaining churches before the 8th century, especially after the great earthquake that struck Lebanon in 551 AD. The Crusaderperiod takes place from the end of the eleventh century tothe end of the thirteenth century(between 1095 and 1291AD).In the 13th century, the Fourth Crusade left behind a series of important churches that had a great impact on the architecture of Lebanon.
{"title":"The morphological characteristics of the old Lebanese churches in Koura, Batroun and Byblos, from the 8th Century to the 13th Century","authors":"G. Issa, Prepis Alkiviadis","doi":"10.22453/lsj-020.3.430-450","DOIUrl":"https://doi.org/10.22453/lsj-020.3.430-450","url":null,"abstract":"Taking into consideration the increasing need to define the chronology of the churches based on their architectural elements.This paper primarily aims to develop a wider understanding of ecclesiastical characteristics;this is exactly why anindispensable analysis was carried out to understand these architectural features and to make them easily recognizable.Furthermore, this research is an attempt to monitor how the different morphological characteristics of churches affectthe general chronology.For the study of the churches, the methodology of investigation of the architectural elementswas used.This tool of investigation has been applied to the direct analysis of morphological evidencefor a better understandingand to clarify its relationship with the chronology.Thisstudy relates to ecclesiastical templesfrom the 8th century to the 13th centuryin Koura, Batroun and Byblos. Unfortunately, there are no remaining churches before the 8th century, especially after the great earthquake that struck Lebanon in 551 AD. The Crusaderperiod takes place from the end of the eleventh century tothe end of the thirteenth century(between 1095 and 1291AD).In the 13th century, the Fourth Crusade left behind a series of important churches that had a great impact on the architecture of Lebanon.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42421827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.391-412
J. Stephan, J. Barhoun, E. Maatouk, B. Foucault, Samir Safi
This phytosociological study of the Dreib Region in Akkar-Lebanonis the first on basaltic bedrockin Lebanon. Thesynusial methods isused and compared bynumerical classification. The latter shows satisfactory results when compared to the synusial manual classification. The followingplant associations are defined:Quercetum veneris–ithaburensis, Calicotomo villosae –Rhamnetum punctati, Eryngio cretici –Echietum angustifolii and Sileno aegyptiacae –Isatidetum lusitanicae.Consequently, the alliance Quercion ithaburensi is stated for the first time in Lebanon. Vegetationseries for progressive and regressive successions are also produced. Further relevés are required to consolidate additional associations that are depicted from both synusial and numerical vegetation classifications.
{"title":"Syntaxonomy of open oak forests on basalt formations in north Lebanon","authors":"J. Stephan, J. Barhoun, E. Maatouk, B. Foucault, Samir Safi","doi":"10.22453/lsj-020.3.391-412","DOIUrl":"https://doi.org/10.22453/lsj-020.3.391-412","url":null,"abstract":"This phytosociological study of the Dreib Region in Akkar-Lebanonis the first on basaltic bedrockin Lebanon. Thesynusial methods isused and compared bynumerical classification. The latter shows satisfactory results when compared to the synusial manual classification. The followingplant associations are defined:Quercetum veneris–ithaburensis, Calicotomo villosae –Rhamnetum punctati, Eryngio cretici –Echietum angustifolii and Sileno aegyptiacae –Isatidetum lusitanicae.Consequently, the alliance Quercion ithaburensi is stated for the first time in Lebanon. Vegetationseries for progressive and regressive successions are also produced. Further relevés are required to consolidate additional associations that are depicted from both synusial and numerical vegetation classifications.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44409521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.352-362
Abdelkader Harizia, Abdelkader Benguerai, Y. Boukhari
A commercial formulation of Bacillus thurengiensis var Kurstaki (BTK) (IAB Bt) has been shown to be effective in controlling Tutaabsoluta Zeller larvae under laboratory conditions. Five concentrations are tested ((200, .350;500;650et800ppm)by ingestion, on the various larval stages (L1, L2, L3, L4 and L5). The larval mortality caused by BTK swelledwith increasing concentrations. The high concentrations of 650 and 800 ppm give 100% mortality rates for the early stages L1, L2, L3 and L4. Theacute toxicity (LC50) of BTK calculated for all larvae is 517 ppm. The lethal efficacy of BTK is noted 02 days, after the ingestion treatment, for the young stages (L1 and L2) and 04 at 6 days for the older larvae (L3 and L4) with a LT50, all larval stages combined equal to 2.6 days.
在实验室条件下，一种商业配方的thurengiensis var Kurstaki (BTK) (IAB Bt)已被证明可以有效地控制Tutaabsoluta Zeller幼虫。在不同的幼虫阶段(L1、L2、L3、L4和L5)，通过摄入测试五种浓度((200、0.350、500、650et800ppm)。BTK引起的幼虫死亡率随着浓度的增加而增加。650和800 ppm的高浓度对L1、L2、L3和L4的早期阶段造成100%的死亡率。BTK对所有幼虫的急性毒性(LC50)为517 ppm。BTK对幼虫(L1和L2)的致死作用在摄食处理后的第02天，对大幼虫(L3和L4)的致死作用在第6天，所有幼虫期之和等于2.6天。
{"title":"Larvicidal activity of Bacillus Thuringiensis Kurstaki against Tuta Absoluta (Lepidoptera: Gelechiidae)","authors":"Abdelkader Harizia, Abdelkader Benguerai, Y. Boukhari","doi":"10.22453/lsj-020.3.352-362","DOIUrl":"https://doi.org/10.22453/lsj-020.3.352-362","url":null,"abstract":"A commercial formulation of Bacillus thurengiensis var Kurstaki (BTK) (IAB Bt) has been shown to be effective in controlling Tutaabsoluta Zeller larvae under laboratory conditions. Five concentrations are tested ((200, .350;500;650et800ppm)by ingestion, on the various larval stages (L1, L2, L3, L4 and L5). The larval mortality caused by BTK swelledwith increasing concentrations. The high concentrations of 650 and 800 ppm give 100% mortality rates for the early stages L1, L2, L3 and L4. Theacute toxicity (LC50) of BTK calculated for all larvae is 517 ppm. The lethal efficacy of BTK is noted 02 days, after the ingestion treatment, for the young stages (L1 and L2) and 04 at 6 days for the older larvae (L3 and L4) with a LT50, all larval stages combined equal to 2.6 days.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45255051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.344-351
A. Bougaham
The breeding ecology of the Robin Erithacusrubeculawas studied in Kabylie of Babors from Algeria, during three years (2016, 2017 and 2018). The breeding season was earlier (March 31) and the clutch sizes were lower (4.15 ± 0.36) compared to their congeners in the Iberian Peninsula. The breeding success atfledging was 2.25 chicks per nest and human disturbance accounted for most of the losses. Robins used up to 23 different plant taxa for nest construction, although the number of different plant species varied from 10 to 14.
在阿尔及利亚的Kabylie of Babors进行了为期三年(2016年、2017年和2018年)的Robin erithacusrubecula繁殖生态学研究。繁殖季节较早(3月31日)，产仔数较低(4.15±0.36)。雏鸟的繁殖成功率为2.25只/巢，人为干扰是造成雏鸟损失的主要原因。知更鸟筑巢时使用了多达23种不同的植物类群，尽管不同植物种类的数量从10到14不等。
{"title":"Breeding ecology of the European Robin (Erithacus Rubecula) in the Kabylie of the Babors (Algerian northeast)","authors":"A. Bougaham","doi":"10.22453/lsj-020.3.344-351","DOIUrl":"https://doi.org/10.22453/lsj-020.3.344-351","url":null,"abstract":"The breeding ecology of the Robin Erithacusrubeculawas studied in Kabylie of Babors from Algeria, during three years (2016, 2017 and 2018). The breeding season was earlier (March 31) and the clutch sizes were lower (4.15 ± 0.36) compared to their congeners in the Iberian Peninsula. The breeding success atfledging was 2.25 chicks per nest and human disturbance accounted for most of the losses. Robins used up to 23 different plant taxa for nest construction, although the number of different plant species varied from 10 to 14.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47544317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.413-429
Tartoura Mohamed, Korechi Raouf, K. Abdellah, Ould El Hadj Mohamed Didi Ould El Hadj Mohamed Didi
Le régime alimentaire de cinq espèces de Mantodeacapturées dans différents biotopes de la vallée du M’Zab (Nord du Sahara Algérien) est étudié. Il s’agit de MantisreligiosaLinnaeus., 1758;SphodromantisviridisForskal., 1775, BlepharopsismendicaFabricius., 1775;Iris oratoriaLinnaeus., 1758;EmpusagutullaThunberg., 1815et AmblythespisgranulataSaussure, 1870.La reconnaissance et l'identification des espèces proies contenues dans les fèces des mantes,a permis de dénombrer 27 espèces d’Arthropoda appartenant à 08 catégories d’ordre et 11 familles trophiques. Une prédominance desformicidae (18%)est enregistrée.La prédation chez M. religiosa, S. viridis, I. oratoria, B. mendica,Empusagutulla et A. granulatas’est manifestée visiblement à partir du mois de mai jusqu’au mois de décembre 2014. Elle atteint son maximum en juillet avec 19 espèces. Ce phénomène de prédation s’est incliné dès le mois d’Aout 2014. Mantisreligiosa et Sphodromantisviridis semblent être les espèces de mantes les plus voraces, avec respectivement 51,9%et 48,1%des espèces proies consommées.
{"title":"Etude du régime alimentaire de quelques espèces de Mantodea dans les conditions naturelles de la vallée du M’Zab (Sahara septentrional Est-Algérien)","authors":"Tartoura Mohamed, Korechi Raouf, K. Abdellah, Ould El Hadj Mohamed Didi Ould El Hadj Mohamed Didi","doi":"10.22453/lsj-020.3.413-429","DOIUrl":"https://doi.org/10.22453/lsj-020.3.413-429","url":null,"abstract":"Le régime alimentaire de cinq espèces de Mantodeacapturées dans différents biotopes de la vallée du M’Zab (Nord du Sahara Algérien) est étudié. Il s’agit de MantisreligiosaLinnaeus., 1758;SphodromantisviridisForskal., 1775, BlepharopsismendicaFabricius., 1775;Iris oratoriaLinnaeus., 1758;EmpusagutullaThunberg., 1815et AmblythespisgranulataSaussure, 1870.La reconnaissance et l'identification des espèces proies contenues dans les fèces des mantes,a permis de dénombrer 27 espèces d’Arthropoda appartenant à 08 catégories d’ordre et 11 familles trophiques. Une prédominance desformicidae (18%)est enregistrée.La prédation chez M. religiosa, S. viridis, I. oratoria, B. mendica,Empusagutulla et A. granulatas’est manifestée visiblement à partir du mois de mai jusqu’au mois de décembre 2014. Elle atteint son maximum en juillet avec 19 espèces. Ce phénomène de prédation s’est incliné dès le mois d’Aout 2014. Mantisreligiosa et Sphodromantisviridis semblent être les espèces de mantes les plus voraces, avec respectivement 51,9%et 48,1%des espèces proies consommées.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48383088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.363-379
Mina El Baji, O. Kodad, H. Hanine, Said En-Nahli, Ait Oubahou
Theobjective of thisstudyis to investigate the phenotypic and biochemicalparameters of selectedsweet cherry (Prunus avium) from middle region of Morocco. Themain biochemical composition, contentsof total polyphenols, total flavonoids, total anthocyanins and antioxidant activity, were measured in the fruits of four sweet cherry cultivars (ʻBurlat’, ʻVan’, ʻNapoleon’andʻCerisette’) grown in two locations (“Laanoceur”and “Toufselt”) in the MiddleAtlas. The free radical scavenging activity was evaluated spectrophotometrically using 1,1‒diphenyl‒2‒picrylhydrazine (DPPH)and ABTS assay.The fruit weight, and pulppercentagewerestudied and found to range between 237–329 g, 38.14–42.22%, 39.21–44.36g, and 52.27–57.48%, respectively.The total phenolic and total anthocyanin content rangedfrom305.99 and 306.67 mg EqGal/100g D.W, total flavonoid contents were within the range of 481.73-517.67 mgeqRE/100g D.W, and total anthocyanin contents were between 1.09 and 2.89 mg Eqcyanidin 3-glucoside/100g D.W. Antioxidant activity ranged from 17.18 to 18.11 mg EqTrolox/100g D.W for DPPH assayand from 27.97 to 29.60 mg EqTrolox/100f D.W for ABTS method.The highest values of total anthocyanin content and antioxidant activity (DPPH) were recorded in ʻBurlat’. The highest value of total flavonoid content was found in ʻCerisette’. Cherries from “Laanoceur”and “Toufselt” locations are characterized by similar biochemical composition and antioxidant activity, except for total anthocyanin content that shows slightly elevated values in “Laanoceur”. The close correlation between total phenolic contents and antioxidant activities (r2=0.73) show that antioxidant activity of cherry fruit depends on total polyphenols.
{"title":"Phenotypic and biochemical parameters of four sweet cherry (Prunus Avium L.) cultivars grown in agro-ecological conditions of middle Atlas of Morocco","authors":"Mina El Baji, O. Kodad, H. Hanine, Said En-Nahli, Ait Oubahou","doi":"10.22453/lsj-020.3.363-379","DOIUrl":"https://doi.org/10.22453/lsj-020.3.363-379","url":null,"abstract":"Theobjective of thisstudyis to investigate the phenotypic and biochemicalparameters of selectedsweet cherry (Prunus avium) from middle region of Morocco. Themain biochemical composition, contentsof total polyphenols, total flavonoids, total anthocyanins and antioxidant activity, were measured in the fruits of four sweet cherry cultivars (ʻBurlat’, ʻVan’, ʻNapoleon’andʻCerisette’) grown in two locations (“Laanoceur”and “Toufselt”) in the MiddleAtlas. The free radical scavenging activity was evaluated spectrophotometrically using 1,1‒diphenyl‒2‒picrylhydrazine (DPPH)and ABTS assay.The fruit weight, and pulppercentagewerestudied and found to range between 237–329 g, 38.14–42.22%, 39.21–44.36g, and 52.27–57.48%, respectively.The total phenolic and total anthocyanin content rangedfrom305.99 and 306.67 mg EqGal/100g D.W, total flavonoid contents were within the range of 481.73-517.67 mgeqRE/100g D.W, and total anthocyanin contents were between 1.09 and 2.89 mg Eqcyanidin 3-glucoside/100g D.W. Antioxidant activity ranged from 17.18 to 18.11 mg EqTrolox/100g D.W for DPPH assayand from 27.97 to 29.60 mg EqTrolox/100f D.W for ABTS method.The highest values of total anthocyanin content and antioxidant activity (DPPH) were recorded in ʻBurlat’. The highest value of total flavonoid content was found in ʻCerisette’. Cherries from “Laanoceur”and “Toufselt” locations are characterized by similar biochemical composition and antioxidant activity, except for total anthocyanin content that shows slightly elevated values in “Laanoceur”. The close correlation between total phenolic contents and antioxidant activities (r2=0.73) show that antioxidant activity of cherry fruit depends on total polyphenols.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42447651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.503-523
N. Chabni, A. Metri, Abdellatif Moussouni, Ahlem Fatmi, Hafsa Azzaoui, S. Otmani, Sidi Smahi, Kaouel Meguenni
L’objectif de ce travail est de déterminer la place des infections nosocomiales dans la morbi-mortalité néonatale, leur profil épidémiologique, dans une unité de néonatologie polyvalente située à l’ouest algérien. Les critères du CDC d’Atlanta pour les enfants moins de 12 mois ont été utilisés pour une étude prospective portant sur une cohorte de nouveau-nés admis entre 2009 et 2010. Les maladies et les causes de décès ont été codées par la classification internationale des maladies et les problèmes de santé connexes, dixième révision (CIM-10). Durant deux années, 3 955 nouveau-nés ont été admis avec un sex-ratio de 1,39. L’âge moyen à l’admission était de 3 ± 0.15jours. La durée moyenne d’hospitalisation était de 5 ± 0.16 jours. Les diagnostics d’infection néonatale, de prématurité et de souffrance respiratoire représentaient la majorité des cas documentés, soit 68%.Un total de 471 décès a été recensé avec un taux de mortalité de 119,34 pour 1000 hospitalisations dont La prématurité est la première cause de mortalité (48%).Un total de 97 épisodes infectieux a été enregistré, soit une densité d'incidence de 6.27 pour 1000 jours d’hospitalisations (IC à 95% : 5,07-7,51 jours) et, une incidence cumulée de 34pour 1000 patients (2,83% - 4,23%) ; un sex-ratio de 0,9. La septicémie représentait la forme prédominante (76%). La létalité était de 36 %. La moyenne de la durée de séjours retrouvée est de 18 jours (3- 70j). Les données concernant les infections nosocomiales chez les nouveau-nés sont à ce jour encore très imprécises dans notre pays. La mise en place d’un système de surveillance adéquat pour leur évaluation périodique serait intéressante.
{"title":"Place de l’infection nosocomiale dans la morbi-mortalité néonatale “hôpital mère enfant Tlemcen Algérie”","authors":"N. Chabni, A. Metri, Abdellatif Moussouni, Ahlem Fatmi, Hafsa Azzaoui, S. Otmani, Sidi Smahi, Kaouel Meguenni","doi":"10.22453/lsj-020.3.503-523","DOIUrl":"https://doi.org/10.22453/lsj-020.3.503-523","url":null,"abstract":"L’objectif de ce travail est de déterminer la place des infections nosocomiales dans la morbi-mortalité néonatale, leur profil épidémiologique, dans une unité de néonatologie polyvalente située à l’ouest algérien. Les critères du CDC d’Atlanta pour les enfants moins de 12 mois ont été utilisés pour une étude prospective portant sur une cohorte de nouveau-nés admis entre 2009 et 2010. Les maladies et les causes de décès ont été codées par la classification internationale des maladies et les problèmes de santé connexes, dixième révision (CIM-10). Durant deux années, 3 955 nouveau-nés ont été admis avec un sex-ratio de 1,39. L’âge moyen à l’admission était de 3 ± 0.15jours. La durée moyenne d’hospitalisation était de 5 ± 0.16 jours. Les diagnostics d’infection néonatale, de prématurité et de souffrance respiratoire représentaient la majorité des cas documentés, soit 68%.Un total de 471 décès a été recensé avec un taux de mortalité de 119,34 pour 1000 hospitalisations dont La prématurité est la première cause de mortalité (48%).Un total de 97 épisodes infectieux a été enregistré, soit une densité d'incidence de 6.27 pour 1000 jours d’hospitalisations (IC à 95% : 5,07-7,51 jours) et, une incidence cumulée de 34pour 1000 patients (2,83% - 4,23%) ; un sex-ratio de 0,9. La septicémie représentait la forme prédominante (76%). La létalité était de 36 %. La moyenne de la durée de séjours retrouvée est de 18 jours (3- 70j). Les données concernant les infections nosocomiales chez les nouveau-nés sont à ce jour encore très imprécises dans notre pays. La mise en place d’un système de surveillance adéquat pour leur évaluation périodique serait intéressante.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48017942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.451-467
Oula El Korhani, Maher Souaidan, D. Zaouk, Randa Khoury, D. Cornu
The potentiality of natural Lebanon minerals for the fabrication of ceramics membranes has been investigated for the first time, opening new perspectives for the development of local, low-cost and sustainable processes for water filtration. Natural clay deposits, originated from North (Kousba, El-Koura), South (Hasbaya) and East (Rashaya, south of the Beqaa valley) regions of Lebanon were collected and investigated in terms of chemical, mineralogical and thermal features. The phase and chemical transformations occurring during heat treatments of these clays were studied by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron spectroscopy (SEM), and X-ray fluorescence (XRF), in view of their uses as membranes for water purification. Flat membranes were prepared by roll-pressing of clay pastes followed by pyrolysis. The mineral membranes were characterized in terms of porosity and water flux.
{"title":"Characterization of natural Lebanese clays for the preparation of ceramic membranes designed to water filtration","authors":"Oula El Korhani, Maher Souaidan, D. Zaouk, Randa Khoury, D. Cornu","doi":"10.22453/lsj-020.3.451-467","DOIUrl":"https://doi.org/10.22453/lsj-020.3.451-467","url":null,"abstract":"The potentiality of natural Lebanon minerals for the fabrication of ceramics membranes has been investigated for the first time, opening new perspectives for the development of local, low-cost and sustainable processes for water filtration. Natural clay deposits, originated from North (Kousba, El-Koura), South (Hasbaya) and East (Rashaya, south of the Beqaa valley) regions of Lebanon were collected and investigated in terms of chemical, mineralogical and thermal features. The phase and chemical transformations occurring during heat treatments of these clays were studied by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron spectroscopy (SEM), and X-ray fluorescence (XRF), in view of their uses as membranes for water purification. Flat membranes were prepared by roll-pressing of clay pastes followed by pyrolysis. The mineral membranes were characterized in terms of porosity and water flux.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49361065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-27DOI: 10.22453/lsj-020.3.495-502
R. Baydoun, Z. El Morr
Radiocarbon dating is a crucial tool for studying national cultural heritage and reconstructing ancient human history. Uncalcined bones, alongside seeds and charcoal, are one of the most reliable materials to be dated, and more precisely the collagen which constitutes around 30% by weight of the whole bone. However, this collagen may not be well preserved due to the effect of physical and chemical properties of the burial environment. Radiocarbon dating of low-collagen bones could be costly, time consuming and cause destruction of valuable archaeological samples without getting reliable ages. Many techniques were developed to test the state of collagen in bone samples. In this work, an Elemental Analyzer was used on twenty-one bone samples to determine %N, C/N ratio and to calculate %C excess as indicator parameters of collagen preservation. All samples were collected from four coastal Lebanese archeological sites. Percentage nitrogen in 15 samples was below the threshold value 0.7% and hence they were not adequate for radiocarbon dating. The ratio C/N in the majority of the samples was higher than 5 indicating extensive diagenetic alteration or contamination by exogenous carbon. The percentages excess carbon were lower than maximum acceptable values 5-10%. Our results emphasize on the importance of collagen prescreening when dating local bone samples which are in many cases degraded.
{"title":"First screening of collagen quality in Lebanese archaeological bones","authors":"R. Baydoun, Z. El Morr","doi":"10.22453/lsj-020.3.495-502","DOIUrl":"https://doi.org/10.22453/lsj-020.3.495-502","url":null,"abstract":"Radiocarbon dating is a crucial tool for studying national cultural heritage and reconstructing ancient human history. Uncalcined bones, alongside seeds and charcoal, are one of the most reliable materials to be dated, and more precisely the collagen which constitutes around 30% by weight of the whole bone. However, this collagen may not be well preserved due to the effect of physical and chemical properties of the burial environment. Radiocarbon dating of low-collagen bones could be costly, time consuming and cause destruction of valuable archaeological samples without getting reliable ages. Many techniques were developed to test the state of collagen in bone samples. In this work, an Elemental Analyzer was used on twenty-one bone samples to determine %N, C/N ratio and to calculate %C excess as indicator parameters of collagen preservation. All samples were collected from four coastal Lebanese archeological sites. Percentage nitrogen in 15 samples was below the threshold value 0.7% and hence they were not adequate for radiocarbon dating. The ratio C/N in the majority of the samples was higher than 5 indicating extensive diagenetic alteration or contamination by exogenous carbon. The percentages excess carbon were lower than maximum acceptable values 5-10%. Our results emphasize on the importance of collagen prescreening when dating local bone samples which are in many cases degraded.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47099253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-27DOI: 10.22453/lsj-020.2.262-271
O. Chaar, G. Jarjoura, Z. Farhat, R. Nader
In this research, coatings with various particles contents will be co-deposited within Ni–P deposits on AISI 1012 steel samples by electroless coating process. As a result, structural changes were evaluated, surface and cross-section morphology of composite deposits have been investigated by scanning electron microscopy (SEM), volumetric percentage of co-deposited particles have been determined using EDS analysis system, corrosion resistance of various EN coatings and current density were studied through potentiodynamic polarization, and mechanical properties were evaluated using wear and nano-indentation tests. The results showed that Alumina can give the best compromise between surface smoothness and deposition rate, Titanium can reach the highest levels of volumetric incorporation whereas Carbon can improve further lubrication effect on wear action, finally hardness and corrosion behavior had the best results with the existence of Alumina.
{"title":"Development of novel corrosion resistant electroless NI-P composite coatings for pipeline steel","authors":"O. Chaar, G. Jarjoura, Z. Farhat, R. Nader","doi":"10.22453/lsj-020.2.262-271","DOIUrl":"https://doi.org/10.22453/lsj-020.2.262-271","url":null,"abstract":"In this research, coatings with various particles contents will be co-deposited within Ni–P deposits on AISI 1012 steel samples by electroless coating process. As a result, structural changes were evaluated, surface and cross-section morphology of composite deposits have been investigated by scanning electron microscopy (SEM), volumetric percentage of co-deposited particles have been determined using EDS analysis system, corrosion resistance of various EN coatings and current density were studied through potentiodynamic polarization, and mechanical properties were evaluated using wear and nano-indentation tests. The results showed that Alumina can give the best compromise between surface smoothness and deposition rate, Titanium can reach the highest levels of volumetric incorporation whereas Carbon can improve further lubrication effect on wear action, finally hardness and corrosion behavior had the best results with the existence of Alumina.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44405293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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