Pub Date : 2019-04-27DOI: 10.22453/lsj-020.1.122-133
J. Dgheim, A. Chahine, M. Ghazeleh, M. Abdallah
Thermoelectric Graphite sheet has been studied numerically due to their ability to convert directly heat to electricity. Electro-thermal heat transfer equations coupling to initial and boundary conditions, are solved using finite difference and finite element schemes. The obtained results of both numerical techniques show good qualitative and quantitative agreements. In addition, the results of our numerical models present good conformity with the experimental result of Luo et al.. The voltage difference, the temperature variation, the Seebeck coefficient, the figure of merit and the maximum efficiency of graphite sheet are determined numerically. The ZT of the graphite sheet is calculated to be 1.27 at a temperature of 850 K for a graphite sheet surface of 0.26×0.25 cm2.
{"title":"Numerical computation of thermoelectric effiency of graphite sheet optimal dimension","authors":"J. Dgheim, A. Chahine, M. Ghazeleh, M. Abdallah","doi":"10.22453/lsj-020.1.122-133","DOIUrl":"https://doi.org/10.22453/lsj-020.1.122-133","url":null,"abstract":"Thermoelectric Graphite sheet has been studied numerically due to their ability to convert directly heat to electricity. Electro-thermal heat transfer equations coupling to initial and boundary conditions, are solved using finite difference and finite element schemes. The obtained results of both numerical techniques show good qualitative and quantitative agreements. In addition, the results of our numerical models present good conformity with the experimental result of Luo et al.. The voltage difference, the temperature variation, the Seebeck coefficient, the figure of merit and the maximum efficiency of graphite sheet are determined numerically. The ZT of the graphite sheet is calculated to be 1.27 at a temperature of 850 K for a graphite sheet surface of 0.26×0.25 cm2.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45241019","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 : 2019-04-27DOI: 10.22453/LSJ-020.1.055-070
A. Kemassi, A. Herouini, S. Hadj, R. Cherif, M. D. O. Elhadj, Ouargla. Bp Ouargla Algérie Département des hydrocarbures UniversitéKasdi-Merb
L’étude réalisée porte sur l’effet insecticide des extraitsfoliaires et racinaires d’EuphorbiaguyonianaBoiss. &Reut. (Euphorbiaceae), récoltées dans Oued Sebseb, Sahara septentrional Est Algérien sur les imagos de Triboliumcastaneum(Herbst, 1797). (Coleoptera-Tenebrionidae). L’extrait aqueux d’Euphorbiaguyoniana engendre une mortalité de 100% sur la population traitée. Ce pourcentage de mortalité est atteint au bout de moins 10 jours.L’estimation de la concentration d’efficacité 50 (CE50) et 90 (CE90) montrele fort effet insecticide de ces préparationsvis-à-vis des imagos de Triboliumcastaneum. Pour le lot d’insectestraitéspar l’extrait foliaire, lesvaleurs de CE50 et CE90 rapportées sont de l’ordre de 0,0158mg/ml et 0,0322mg/ml respectivement,et de 0,0186 mg/ml et 0,0394mg/ml pour l’extrait racinaire,respectivement. L’évaluation des temps létaux 50 (TL50) montre que les deux extraits d’Euphorbiaguyoniana ont une rapidité d’action particulière vis-à-vis des imagos de Triboliumcastaneum.
{"title":"Effet insecticide des extraits aqueux d’Euphorbia Guyoniana (Euphorbiaceae) récoltée dans Oued Sebseb (Sahara algérien) sur le Tribolium Castaneum","authors":"A. Kemassi, A. Herouini, S. Hadj, R. Cherif, M. D. O. Elhadj, Ouargla. Bp Ouargla Algérie Département des hydrocarbures UniversitéKasdi-Merb","doi":"10.22453/LSJ-020.1.055-070","DOIUrl":"https://doi.org/10.22453/LSJ-020.1.055-070","url":null,"abstract":"L’étude réalisée porte sur l’effet insecticide des extraitsfoliaires et racinaires d’EuphorbiaguyonianaBoiss. &Reut. (Euphorbiaceae), récoltées dans Oued Sebseb, Sahara septentrional Est Algérien sur les imagos de Triboliumcastaneum(Herbst, 1797). (Coleoptera-Tenebrionidae). L’extrait aqueux d’Euphorbiaguyoniana engendre une mortalité de 100% sur la population traitée. Ce pourcentage de mortalité est atteint au bout de moins 10 jours.L’estimation de la concentration d’efficacité 50 (CE50) et 90 (CE90) montrele fort effet insecticide de ces préparationsvis-à-vis des imagos de Triboliumcastaneum. Pour le lot d’insectestraitéspar l’extrait foliaire, lesvaleurs de CE50 et CE90 rapportées sont de l’ordre de 0,0158mg/ml et 0,0322mg/ml respectivement,et de 0,0186 mg/ml et 0,0394mg/ml pour l’extrait racinaire,respectivement. L’évaluation des temps létaux 50 (TL50) montre que les deux extraits d’Euphorbiaguyoniana ont une rapidité d’action particulière vis-à-vis des imagos de Triboliumcastaneum.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49360755","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 : 2019-04-27DOI: 10.22453/lsj-020.1.071-088
M. Hattab, A. Gaouar
La population montagnarde algérienne reste tributaire surtout d’une agriculture fragile. À cet effet, le présent travail consiste à effectuer une évaluationapprofondiede la situation actuelle des exploitations agricoles, qui sont fortement fragilisées par différentes contraintesdans les monts de Tlemcen, afin d’évaluer leur potentiel productif. Les résultats obtenus ont montréque les exploitations enquêtées quoiqu’elles appartiennent à un même ensemble montagneux, elles se distinguent par des particularités différentes d’une région à une autre. Certaines exploitations sont orientées vers le modeld’exploitation familiale à cause de leur morcellement répété et du manque de main d’œuvre salariée. D’autres exploitations sont obligées de développer une stratégie de survie basée essentiellement sur une céréaliculture extensive combinée surtout avec l’élevage ovin. Dans l’ensemble, les moyens de production actuels de toutes les exploitations enquêtées sont insuffisants pour qu’elles puissent résister au climat irrégulier, à la configuration difficile des terrains et aux fluctuations du marché.
{"title":"Evaluation du potentiel productif des exploitations agricoles dans les monts de Tlemcen (nord-ouest de l’Algérie)","authors":"M. Hattab, A. Gaouar","doi":"10.22453/lsj-020.1.071-088","DOIUrl":"https://doi.org/10.22453/lsj-020.1.071-088","url":null,"abstract":"La population montagnarde algérienne reste tributaire surtout d’une agriculture fragile. À cet effet, le présent travail consiste à effectuer une évaluationapprofondiede la situation actuelle des exploitations agricoles, qui sont fortement fragilisées par différentes contraintesdans les monts de Tlemcen, afin d’évaluer leur potentiel productif. Les résultats obtenus ont montréque les exploitations enquêtées quoiqu’elles appartiennent à un même ensemble montagneux, elles se distinguent par des particularités différentes d’une région à une autre. Certaines exploitations sont orientées vers le modeld’exploitation familiale à cause de leur morcellement répété et du manque de main d’œuvre salariée. D’autres exploitations sont obligées de développer une stratégie de survie basée essentiellement sur une céréaliculture extensive combinée surtout avec l’élevage ovin. Dans l’ensemble, les moyens de production actuels de toutes les exploitations enquêtées sont insuffisants pour qu’elles puissent résister au climat irrégulier, à la configuration difficile des terrains et aux fluctuations du marché.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48175450","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 : 2019-04-27DOI: 10.22453/lsj-020.1.035-054
K. Bouti, H. Boudjella, N. Bouras, A. Zitouni, F. Mathieu, N. Sabaou
n a continuing search fornew antimicrobial products from actinobacteriacollected in Algerian Saharan soils, an isolateof actinobacteria,designated Sg163, was selected for its interesting antimicrobial activity.The isolate wasidentified to the genus Streptosporangium by phenotypicand molecular criteria. The cultural and physiological characterizations as well as phylogenetic analysis indicated that the isolate was different from known members of the genus Streptosporangium. Analysis of the 16S rRNA sequence showed 97.09to 98.27% similarity with those of Streptosporangium type strains. The strainSg163 produced antifungal and antibacterial activities on several culture media. The highest antimicrobial activities were obtained in ISP2 medium. Three active products C1, C2 and C3 with both antifungal and antibacterial activities were isolated and purified by chromatographic methodswith C2, as the major compound. The data of the infraredspectroscopy andthe chemical revelations, suggested that the active molecules were glycosylatedaromaticcompounds.
{"title":"Taxonomy and antimicrobial activity of streptosporangium strain SG163 isolated from a Saharan soil","authors":"K. Bouti, H. Boudjella, N. Bouras, A. Zitouni, F. Mathieu, N. Sabaou","doi":"10.22453/lsj-020.1.035-054","DOIUrl":"https://doi.org/10.22453/lsj-020.1.035-054","url":null,"abstract":"n a continuing search fornew antimicrobial products from actinobacteriacollected in Algerian Saharan soils, an isolateof actinobacteria,designated Sg163, was selected for its interesting antimicrobial activity.The isolate wasidentified to the genus Streptosporangium by phenotypicand molecular criteria. The cultural and physiological characterizations as well as phylogenetic analysis indicated that the isolate was different from known members of the genus Streptosporangium. Analysis of the 16S rRNA sequence showed 97.09to 98.27% similarity with those of Streptosporangium type strains. The strainSg163 produced antifungal and antibacterial activities on several culture media. The highest antimicrobial activities were obtained in ISP2 medium. Three active products C1, C2 and C3 with both antifungal and antibacterial activities were isolated and purified by chromatographic methodswith C2, as the major compound. The data of the infraredspectroscopy andthe chemical revelations, suggested that the active molecules were glycosylatedaromaticcompounds.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47395979","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 : 2019-04-27DOI: 10.22453/lsj-020.1.148-160
P. Nassiri, A. Abbasi, A. Poornadjaf, P. Jafari Shalkouhi, P. Bahrami
Previous studies havedemonstratedassociation between exposure to occupational(workplace)noiseand blood pressure.The goal of the presentresearch was to investigate arelationshipbetween noise exposure and blood pressure among 1374 workers from 12 companies.Based on a confidence level of 95% (05.0), 175 workers as a case group and 174 as a control group wererandomly selected.In addition, theparticipantsweredivided intodifferent ageand work experiencegroups. The results revealedthat noise levelsin mostof companies exceededthe NIOSH (1998)standard. They also show asignificant statistical relationshipbetween exposuresto occupational noise level≥100 dBA (A-weighted decibel),hypertension andwork experience≥4years.It wasconcluded thatto study anassociationbetween exposure to workplacenoise and blood pressure,length of time on jobmust be taken into consideration.
{"title":"Occupational noise and blood pressure variation","authors":"P. Nassiri, A. Abbasi, A. Poornadjaf, P. Jafari Shalkouhi, P. Bahrami","doi":"10.22453/lsj-020.1.148-160","DOIUrl":"https://doi.org/10.22453/lsj-020.1.148-160","url":null,"abstract":"Previous studies havedemonstratedassociation between exposure to occupational(workplace)noiseand blood pressure.The goal of the presentresearch was to investigate arelationshipbetween noise exposure and blood pressure among 1374 workers from 12 companies.Based on a confidence level of 95% (05.0), 175 workers as a case group and 174 as a control group wererandomly selected.In addition, theparticipantsweredivided intodifferent ageand work experiencegroups. The results revealedthat noise levelsin mostof companies exceededthe NIOSH (1998)standard. They also show asignificant statistical relationshipbetween exposuresto occupational noise level≥100 dBA (A-weighted decibel),hypertension andwork experience≥4years.It wasconcluded thatto study anassociationbetween exposure to workplacenoise and blood pressure,length of time on jobmust be taken into consideration.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43057219","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 : 2019-04-27DOI: 10.22453/LSJ-020.1.104-121
B. Talaee, G. Nasiri
There are some interesting relations between submodules of a module and its intuitionistic fuzzy (IF) submodules. In this paper we investigate some relationshipsbetween submodules of a module and its IFsubmodules. Then we introduce a graph structure on IFsubmodules of a module and obtain some properties of it, that is the main goal of this paper. We define the intersection graph of submodules of a module M(G) and we show that a submodule Nof Mis a center in MGif and only if IFNis a center in IFG. We get some relationships between IFsubmodules of a module and their supports, as vertices of IFgraph and crisp graph of a module M, respectively. We show that an IFsubmodule Aof Mis center in IFgraph of Mif and only ifAis a center in crisp graph of M.In prime ring R, we show that every vertex of intersection graph of IFideals of Ris center. In general the nature of intersection graph of IFsubmodules of a module under intersection, homomorphic images, finite sum and other algebraic operations of its vertices, are investigated.
{"title":"On intersection graph of intuitionistic fuzzy submodules of a module","authors":"B. Talaee, G. Nasiri","doi":"10.22453/LSJ-020.1.104-121","DOIUrl":"https://doi.org/10.22453/LSJ-020.1.104-121","url":null,"abstract":"There are some interesting relations between submodules of a module and its intuitionistic fuzzy (IF) submodules. In this paper we investigate some relationshipsbetween submodules of a module and its IFsubmodules. Then we introduce a graph structure on IFsubmodules of a module and obtain some properties of it, that is the main goal of this paper. We define the intersection graph of submodules of a module M(G) and we show that a submodule Nof Mis a center in MGif and only if IFNis a center in IFG. We get some relationships between IFsubmodules of a module and their supports, as vertices of IFgraph and crisp graph of a module M, respectively. We show that an IFsubmodule Aof Mis center in IFgraph of Mif and only ifAis a center in crisp graph of M.In prime ring R, we show that every vertex of intersection graph of IFideals of Ris center. In general the nature of intersection graph of IFsubmodules of a module under intersection, homomorphic images, finite sum and other algebraic operations of its vertices, are investigated.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41632453","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 : 2019-04-27DOI: 10.22453/lsj-020.1.161-172
S. Mohammadi, Kh. Piri, M. Dinarvand
Medicinal plantsused in treatment of diseases earlier times, are potential sources of new drugs. In this study, chemical compositions of Echium khuzestanicum, Marrubium anisodan and Echinops cephalotes were identified by Gas Chromatography-Mass Spectrometry(GC/MS).M.anisodanand E.cephalotes aerial organs and E.khuzistanicum flowers were extracted by maceration method. According to the results, 46 kinds of chemical compounds found in methanol extract of E.khuzestanicum. There are mucilage, fatty acids, flavonoid and diterpenes in the flower of E.khuzestanicum. Seventy sixkinds of chemical compounds were found in methanol extract of E.cephalotesincludingaldehydes (7.9%), phenols (7.5%), fatty acids (5.8%) and furfural (5.4%)and86 kinds of chemical compounds found in M.anisodan extract. Furfural, steroids, vitamin B and flavonoids are the main compounds of M.anisodan.
{"title":"Identification of chemical compositions in some medicinal plants by GC/MS analysis","authors":"S. Mohammadi, Kh. Piri, M. Dinarvand","doi":"10.22453/lsj-020.1.161-172","DOIUrl":"https://doi.org/10.22453/lsj-020.1.161-172","url":null,"abstract":"Medicinal plantsused in treatment of diseases earlier times, are potential sources of new drugs. In this study, chemical compositions of Echium khuzestanicum, Marrubium anisodan and Echinops cephalotes were identified by Gas Chromatography-Mass Spectrometry(GC/MS).M.anisodanand E.cephalotes aerial organs and E.khuzistanicum flowers were extracted by maceration method. According to the results, 46 kinds of chemical compounds found in methanol extract of E.khuzestanicum. There are mucilage, fatty acids, flavonoid and diterpenes in the flower of E.khuzestanicum. Seventy sixkinds of chemical compounds were found in methanol extract of E.cephalotesincludingaldehydes (7.9%), phenols (7.5%), fatty acids (5.8%) and furfural (5.4%)and86 kinds of chemical compounds found in M.anisodan extract. Furfural, steroids, vitamin B and flavonoids are the main compounds of M.anisodan.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47232472","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 : 2019-04-27DOI: 10.22453/lsj-020.1.089-103
S. Rouphael, F. El Mekdad, A. Mouawad, M. Mjallal, E. Touma, S. El Hajj, A. Hajj, T. Atallah
The effect of the cover crops, narbon vetch (Vicia narbonensis), oat (Avena sativa), forage radish (Raphanus sativus), on weed suppressionandsoil nitrogenwas studied in field conditions overwinter. The impact of their residues on the productivity of a subsequent corn crop was followed in the summerof the same year. Between mid-November andMarch oat produced, on a dry weight basis,915 g m-2against 402 g m-2for narbon vetch and 292 g m-2for radish. Consequently, weeds were suppressed best in the presence of oat. Narbon vetchwas less effective than radishin controlling weeds, as it was slowerto get established. In terms of mineral nitrogen, soils occupied by radish (13.1 mg kg-1soil) presented smaller concentrations of ammonium-Nthanthose by vetch(18.7 mg kg-1soil)and the control(19.7 mg kg-1soil). Following the overwinter covercrops, plots were split intoone half whereroots only were incorporated,and another half receivingwhole plants. Residues of whole plants promoted higher production of corn in the booting and flowering stages, as compared to roots only. At the 50% doughstage, the highest dry matter yield was 7.6 Mgha-1afternarbon vetch. Cornyield was the smallest after oat, due to N immobilization. This was demonstrated, using the litter bag technique, when oat residues (15.6g N kg-1) lost 31% of their N against 66% for radishresidues(21.1g N kg-1).For an effective control of weeds and nutrient recycling a cover crop, such as oat, is most efficient. In this case, the succeeding summer crop needs to receive some extra nitrogen.
在田间越冬条件下，研究了覆盖作物紫金豌豆(Vicia narbonensis)、燕麦(Avena sativa)、饲用萝卜(Raphanus sativus)对杂草抑制和土壤氮素的影响。他们的残留物对随后的玉米作物生产力的影响在同年夏季进行了跟踪研究。11月中旬至3月间，以干重计算，燕麦产量为915克米-2，而野豌豆产量为402克米-2，萝卜产量为292克米-2。因此，燕麦对杂草的抑制效果最好。在控制杂草方面，野豌豆不如萝卜有效，因为它的生长速度较慢。在矿质氮方面，萝卜占用土壤(13.1 mg kg-1)的铵态氮含量低于紫薇占用土壤(18.7 mg kg-1)和对照土壤(19.7 mg kg-1)。在越冬覆盖作物之后，地块被分成一半只种植根，另一半种植整株植物。在孕穗期和开花期，整株秸秆比仅施根秸秆能提高玉米产量。在50%发酵阶段，干物质产量最高，为7.6 mha -1。由于氮的固定作用，玉米产量仅次于燕麦。使用凋落物袋技术证明了这一点，当燕麦秸秆(15.6g N kg-1)损失31%的氮时，萝卜秸秆(21.1g N kg-1)损失66%。为了有效地控制杂草和养分循环，覆盖作物，如燕麦，是最有效的。在这种情况下，接下来的夏季作物需要获得一些额外的氮。
{"title":"Performance of overwinter cover crops in coastal Lebanon","authors":"S. Rouphael, F. El Mekdad, A. Mouawad, M. Mjallal, E. Touma, S. El Hajj, A. Hajj, T. Atallah","doi":"10.22453/lsj-020.1.089-103","DOIUrl":"https://doi.org/10.22453/lsj-020.1.089-103","url":null,"abstract":"The effect of the cover crops, narbon vetch (Vicia narbonensis), oat (Avena sativa), forage radish (Raphanus sativus), on weed suppressionandsoil nitrogenwas studied in field conditions overwinter. The impact of their residues on the productivity of a subsequent corn crop was followed in the summerof the same year. Between mid-November andMarch oat produced, on a dry weight basis,915 g m-2against 402 g m-2for narbon vetch and 292 g m-2for radish. Consequently, weeds were suppressed best in the presence of oat. Narbon vetchwas less effective than radishin controlling weeds, as it was slowerto get established. In terms of mineral nitrogen, soils occupied by radish (13.1 mg kg-1soil) presented smaller concentrations of ammonium-Nthanthose by vetch(18.7 mg kg-1soil)and the control(19.7 mg kg-1soil). Following the overwinter covercrops, plots were split intoone half whereroots only were incorporated,and another half receivingwhole plants. Residues of whole plants promoted higher production of corn in the booting and flowering stages, as compared to roots only. At the 50% doughstage, the highest dry matter yield was 7.6 Mgha-1afternarbon vetch. Cornyield was the smallest after oat, due to N immobilization. This was demonstrated, using the litter bag technique, when oat residues (15.6g N kg-1) lost 31% of their N against 66% for radishresidues(21.1g N kg-1).For an effective control of weeds and nutrient recycling a cover crop, such as oat, is most efficient. In this case, the succeeding summer crop needs to receive some extra nitrogen.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47341266","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 : 2019-01-01DOI: 10.22453/lsj-020.1.134-147
M. Moussallem, J. Jocmek
Smoking remains a worldwide health hazard. Smokers don't only put themselves at risk of serious health problems, but people around them arealso exposed to such potential danger. This passive exposition iscalled: Second Hand Smoke (SHS).To limit the SHS contamination in an Environmental Tobacco Smoke a new “Healthy Second Hand Smoke (HSHS)” device was developed. In this paper,we will explainthe functioningbasics of the HSHS device. It ismainly based on an insulatedsmoke compartment with transparent view, placed in the area where smokers and non-smokers exist together. Smoker inhalesand exhalessmoke through an“HSHS”accessory called “hand”which is related to the compartment by two hoses.In this compartment, an aspiration system is used to evacuate the smoke. Theefficiencyof the “HSHS”deviceis thenevaluated. For four hookah smokers, the Carbonemonoxide gas concentration was measured during 30 min in a5.3m3unventilatedexperimentalroom. A comparison was made between the smoke concentration in the unventilated room, with and without the use of the HSHS device.Statistical tests were performed in order to insure the validity of the results thatwere taken for four smokers only.The results showthat the use of HSHS device reduces second hand hookahinhalationsmoke, in a 5.3 m3unventilated room, by95.9% ± 28.2%, 91.8% ± 37.5%, 97.8% ± 15.7% and 98.5% ± 66.2% during 10, 15, 20 and 25 minutesrespectively.As aconclusion, this new smoking concept opens the way forless invasive smoking habitsin crowded environments.
{"title":"Development of a novel second-hand smoke reduction device","authors":"M. Moussallem, J. Jocmek","doi":"10.22453/lsj-020.1.134-147","DOIUrl":"https://doi.org/10.22453/lsj-020.1.134-147","url":null,"abstract":"Smoking remains a worldwide health hazard. Smokers don't only put themselves at risk of serious health problems, but people around them arealso exposed to such potential danger. This passive exposition iscalled: Second Hand Smoke (SHS).To limit the SHS contamination in an Environmental Tobacco Smoke a new “Healthy Second Hand Smoke (HSHS)” device was developed. In this paper,we will explainthe functioningbasics of the HSHS device. It ismainly based on an insulatedsmoke compartment with transparent view, placed in the area where smokers and non-smokers exist together. Smoker inhalesand exhalessmoke through an“HSHS”accessory called “hand”which is related to the compartment by two hoses.In this compartment, an aspiration system is used to evacuate the smoke. Theefficiencyof the “HSHS”deviceis thenevaluated. For four hookah smokers, the Carbonemonoxide gas concentration was measured during 30 min in a5.3m3unventilatedexperimentalroom. A comparison was made between the smoke concentration in the unventilated room, with and without the use of the HSHS device.Statistical tests were performed in order to insure the validity of the results thatwere taken for four smokers only.The results showthat the use of HSHS device reduces second hand hookahinhalationsmoke, in a 5.3 m3unventilated room, by95.9% ± 28.2%, 91.8% ± 37.5%, 97.8% ± 15.7% and 98.5% ± 66.2% during 10, 15, 20 and 25 minutesrespectively.As aconclusion, this new smoking concept opens the way forless invasive smoking habitsin crowded environments.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68676149","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 : 2019-01-01DOI: 10.22453/lsj-020.2.248-261
K. Slim, A. Fadel
The planktonic organisms are characterized by their strong capacity of reproduction as well as a high death rate. The factors that intervene simultaneously and result in the seasonal succession and change in the planktonic community are not well studied, especially in Middle East fresh water bodies. Stratification, nutrients, oxygen and light intensity can lead to an increase in phytoplankton and cyanobacteria biomass. In this study, we monitor the interaction between zooplankton and cyanobacteria in Karaoun Reservoir, the largest freshwater body in Lebanon. Karaoun Reservoir has gone through a degradation of its water quality and eutrophication with a very low phytoplankton biodiversity and a dominance of two toxic cyanobacteria species (Microcystis aeruginosa and Aphanizomenon ovalisporum) forming a thick bloom that persisted during the years 2016 and 2017. This spring bloom assured the development of small cladoceran, rotifers that were replaced progressively by big cladoceran such as Daphnia and by copepods Calanoides. Having strongly contributed to the exhaustion of their food resources and being equally submitted to a strong predation from the zooplankton feeding fish such as the carps, the zooplanktonic species decrease gradually till their total disappearance at the beginning of summer. The lake's zooplankton does not proliferate until the end of spring and disappears completely after. The environment rich in cyanotoxins does not seem to be responsible for this decrease. This was attributed to the grazing by Cyprinus carpio. The cycle of these species pass through a period of spring reproduction which allows the zooplankton to develop without being reduced by these fish species.
{"title":"A first study on the zooplankton-cyanobacteria interactions in Karaoun reservoir (Lebanon) during 2016-2017","authors":"K. Slim, A. Fadel","doi":"10.22453/lsj-020.2.248-261","DOIUrl":"https://doi.org/10.22453/lsj-020.2.248-261","url":null,"abstract":"The planktonic organisms are characterized by their strong capacity of reproduction as well as a high death rate. The factors that intervene simultaneously and result in the seasonal succession and change in the planktonic community are not well studied, especially in Middle East fresh water bodies. Stratification, nutrients, oxygen and light intensity can lead to an increase in phytoplankton and cyanobacteria biomass. In this study, we monitor the interaction between zooplankton and cyanobacteria in Karaoun Reservoir, the largest freshwater body in Lebanon. Karaoun Reservoir has gone through a degradation of its water quality and eutrophication with a very low phytoplankton biodiversity and a dominance of two toxic cyanobacteria species (Microcystis aeruginosa and Aphanizomenon ovalisporum) forming a thick bloom that persisted during the years 2016 and 2017. This spring bloom assured the development of small cladoceran, rotifers that were replaced progressively by big cladoceran such as Daphnia and by copepods Calanoides. Having strongly contributed to the exhaustion of their food resources and being equally submitted to a strong predation from the zooplankton feeding fish such as the carps, the zooplanktonic species decrease gradually till their total disappearance at the beginning of summer. The lake's zooplankton does not proliferate until the end of spring and disappears completely after. The environment rich in cyanotoxins does not seem to be responsible for this decrease. This was attributed to the grazing by Cyprinus carpio. The cycle of these species pass through a period of spring reproduction which allows the zooplankton to develop without being reduced by these fish species.","PeriodicalId":31081,"journal":{"name":"Lebanese Science Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68675906","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：