Pub Date : 2016-12-27DOI: 10.22453/LSJ-017.2.146165
Dalila Chiheb, Mebarek Belaoura, M. N. Oudjit, A. Bali
{"title":"Incorporation des sables concassés à différents taux de fillers dans la composition des bétons à très hautes performances : Comportement mécanique et Durabilité","authors":"Dalila Chiheb, Mebarek Belaoura, M. N. Oudjit, A. Bali","doi":"10.22453/LSJ-017.2.146165","DOIUrl":"https://doi.org/10.22453/LSJ-017.2.146165","url":null,"abstract":"","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"178 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124408539","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 : 2016-12-27DOI: 10.22453/LSJ-017.2.200216
R. Harkouss, B. Hamad
{"title":"Comparative studies of self-compacting concrete made with different generations of superplasticizers","authors":"R. Harkouss, B. Hamad","doi":"10.22453/LSJ-017.2.200216","DOIUrl":"https://doi.org/10.22453/LSJ-017.2.200216","url":null,"abstract":"","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123422784","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 : 2016-12-27DOI: 10.22453/LSJ-017.2.166176
I. Kassaa, Nancy Safourim, N. Mostafa, M. Hamzé
{"title":"Antimicrobial activity and high thermostability of a novel BLIS secreted by Enterococcus Mundtii isolated from Lebanese cow’s milk","authors":"I. Kassaa, Nancy Safourim, N. Mostafa, M. Hamzé","doi":"10.22453/LSJ-017.2.166176","DOIUrl":"https://doi.org/10.22453/LSJ-017.2.166176","url":null,"abstract":"","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123846190","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 : 2016-12-27DOI: 10.22453/LSJ-017.2.130145
A. Fadel, G. Faour, K. Slim
Fadel, A., Faour, G. and Slim K. 2016. Assessment of the trophic state and chlorophyll-a concentrations using Landsat OLI in Karaoun reservoir, Lebanon. Lebanese Science Journal, 17(2): 130-145. Harmful algal blooms have become a worldwide environmental problem. A regular and cost-effective monitoring of these blooms is highly needed by lakes managers. Satellite remote sensing imagery like Landsat Operational Land Imager (OLI) can be used to assess and monitor chlorophyll-a in water bodies over large areas in a cost-effective way. In this study, the accuracy of Landsat OLI to estimate chlorophyll-a was examined. Four field campaigns and cloud free images of Landsat OLI with 30 m resolution (01 May 2013, 21 August 2013, 10 July 2015, and 11 August 2015) were used in this study to determine the accuracy of Landsat OLI in estimating chlorophyll-a in a 12 km freshwater body, Karaoun reservoir. After atmospheric correction of these images, reflectance of single and multiple band combinations were compared to field chlorophyll-a data. Results of field campaigns showed that the trophic state of Karaoun reservoir is still eutrophic to hypereutrophic with high nutrient concentration and low phytoplankton biodiversity, dominated by cyanobacteria species, Microcystis aeruginosa and Aphanizomenon ovalisporum. On single band level, the in situ chlorophyll-a measurement correlated best with band 5 (0.85 0.88 μm), with R=0.75 and R=0.57. Highest correlation (R=0.84 and R=0.72) was obtained using band combination, B2:B4 band ratio multiplied by B5. Results indicated that Landsat OLI can be used effectively to determine chlorophyll-a concentration in lakes and reservoirs. We recommend the application of Landsat OLI as a satisfactory and cost effective method for monitoring chlorophyll-a in other lakes through-out the world.
{"title":"Assessment of The trophic state and Chlorophyll-a concentrations using Landsat OLI in Karaoun reservoir, Lebanon","authors":"A. Fadel, G. Faour, K. Slim","doi":"10.22453/LSJ-017.2.130145","DOIUrl":"https://doi.org/10.22453/LSJ-017.2.130145","url":null,"abstract":"Fadel, A., Faour, G. and Slim K. 2016. Assessment of the trophic state and chlorophyll-a concentrations using Landsat OLI in Karaoun reservoir, Lebanon. Lebanese Science Journal, 17(2): 130-145. Harmful algal blooms have become a worldwide environmental problem. A regular and cost-effective monitoring of these blooms is highly needed by lakes managers. Satellite remote sensing imagery like Landsat Operational Land Imager (OLI) can be used to assess and monitor chlorophyll-a in water bodies over large areas in a cost-effective way. In this study, the accuracy of Landsat OLI to estimate chlorophyll-a was examined. Four field campaigns and cloud free images of Landsat OLI with 30 m resolution (01 May 2013, 21 August 2013, 10 July 2015, and 11 August 2015) were used in this study to determine the accuracy of Landsat OLI in estimating chlorophyll-a in a 12 km freshwater body, Karaoun reservoir. After atmospheric correction of these images, reflectance of single and multiple band combinations were compared to field chlorophyll-a data. Results of field campaigns showed that the trophic state of Karaoun reservoir is still eutrophic to hypereutrophic with high nutrient concentration and low phytoplankton biodiversity, dominated by cyanobacteria species, Microcystis aeruginosa and Aphanizomenon ovalisporum. On single band level, the in situ chlorophyll-a measurement correlated best with band 5 (0.85 0.88 μm), with R=0.75 and R=0.57. Highest correlation (R=0.84 and R=0.72) was obtained using band combination, B2:B4 band ratio multiplied by B5. Results indicated that Landsat OLI can be used effectively to determine chlorophyll-a concentration in lakes and reservoirs. We recommend the application of Landsat OLI as a satisfactory and cost effective method for monitoring chlorophyll-a in other lakes through-out the world.","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115961404","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 : 2016-12-27DOI: 10.22453/LSJ-017.2.104116
K. Garah, Chaouki Chafai, A. Bentouati
{"title":"Évolution spatio-temporelle des écosystèmes forestiers à pin D’Alep de L’Aurès oriental en Algérie","authors":"K. Garah, Chaouki Chafai, A. Bentouati","doi":"10.22453/LSJ-017.2.104116","DOIUrl":"https://doi.org/10.22453/LSJ-017.2.104116","url":null,"abstract":"","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123486419","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 : 2016-12-01DOI: 10.22453/LSJ-017.2.233239
Ranin Bechara, M. Hosny, Imad Al-Kassaa, F. Dabboussi, H. Mallat, M. Hamzé
{"title":"Detection of pathogenic bacteria in diarrheal stool collected from children in North Lebanon by using conventional stool culture and microarray technique « CLART® Enterobac »","authors":"Ranin Bechara, M. Hosny, Imad Al-Kassaa, F. Dabboussi, H. Mallat, M. Hamzé","doi":"10.22453/LSJ-017.2.233239","DOIUrl":"https://doi.org/10.22453/LSJ-017.2.233239","url":null,"abstract":"","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123511693","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}
A. Neo, T. Kakue, Yutaka Endo, T. Shimobaba, T. Ito
1.2 研究背景 ホログラフィを用いた3次元表示システムの開発を 行っている.本システムは3次元の物体を点群として捉 えた物体情報をあらかじめ計算機内に保有し,計算機上 でホログラムを生成し,表示デバイスを用いることで, 空間上に3次元物体像を得るシステムである(Fig. 2).こ こで,物体情報は点群を構成する全ての点(物体点)の3次 元座標から構成され,計算機上で生成するホログラムを 計算機合成ホログラム(Computer Generated Hologram: CGH)という. 計算負荷の高いCGH生成を従来はC言語を用いたマル チスレッド処理やGPU(Graphics Processing Unit)処理を 適用し,高速に計算していた. しかし,MATLABも2007年にマルチスレッド処理, We calculate computer-generated holograms (CGHs), whose calculation load is very heavy in MATLAB, which has abundant analysis functions. In this study, we developed four methods to speed up CGH calculation: (1) processing of point clouds as a matrix, (2) construction of a column-pixel matrix, (3) calculation of CGHs with GPU, and (4) construction of a row-pixel matrix. As a result, there was 453 times speeding up in comparison with that with the conventional method.
1.2研究正在进行使用背景全息成像的三维显示系统的开发。该系统是将捕捉到的三维物体作为点群的物体信息预先保存在计算机内，在计算机上生成全息图像，通过使用显示设备，是在空间上得到三维物体像的系统(Fig. 2).在这里，物体信息由构成点群的所有点(物体点)的三次元坐标构成，在计算机上生成全息图。被称为计算机合成全息图(Computer Generated Hologram, CGH)。对于计算负荷高的CGH生成，过去采用使用C语言的multi线程处理和GPU(Graphics Processing Unit，图形处理单元)处理进行高速计算。但是，MATLAB也在2007年推出了多线程处理，We calculate computer-generated holograms (CGHs)，whose calculation load is very heavy in MATLAB，which has abundant analysis functions. In this study，we developed four methods to speed up CGH calculation:(1) processing of point clouds as a matrix， (2) construction of a column-pixel matrix，calculation of CGHs with GPU, and (4) construction of a law -pixel matrix. As a result，there was 453 times speeding up in comparison with that with the conventional method。
{"title":"Speeding Up the Calculation of Computer-Generated Holograms Using MATLAB","authors":"A. Neo, T. Kakue, Yutaka Endo, T. Shimobaba, T. Ito","doi":"10.2184/LSJ.44.7_458","DOIUrl":"https://doi.org/10.2184/LSJ.44.7_458","url":null,"abstract":"1.2 研究背景 ホログラフィを用いた3次元表示システムの開発を 行っている.本システムは3次元の物体を点群として捉 えた物体情報をあらかじめ計算機内に保有し,計算機上 でホログラムを生成し,表示デバイスを用いることで, 空間上に3次元物体像を得るシステムである(Fig. 2).こ こで,物体情報は点群を構成する全ての点(物体点)の3次 元座標から構成され,計算機上で生成するホログラムを 計算機合成ホログラム(Computer Generated Hologram: CGH)という. 計算負荷の高いCGH生成を従来はC言語を用いたマル チスレッド処理やGPU(Graphics Processing Unit)処理を 適用し,高速に計算していた. しかし,MATLABも2007年にマルチスレッド処理, We calculate computer-generated holograms (CGHs), whose calculation load is very heavy in MATLAB, which has abundant analysis functions. In this study, we developed four methods to speed up CGH calculation: (1) processing of point clouds as a matrix, (2) construction of a column-pixel matrix, (3) calculation of CGHs with GPU, and (4) construction of a row-pixel matrix. As a result, there was 453 times speeding up in comparison with that with the conventional method.","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125557531","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 : 2016-06-27DOI: 10.22453/LSJ-017.1.045056
Z. A. Khattar, S. Gaudriault, A. Givaudan
Abi Khattar Z., S. Gaudriault and A. Givaudan. 2016. A functional msbB acyltransferase of Photorhabdus luminescens, required for secondary lipid a acylation in gram-negative bacteria, confers resistance to anti-microbial peptides. Lebanese Science Journal, 17(1): 45-56. Lipid A is a potent endotoxin, and its fatty acids (lauric, myristic, and sometimes palmitic acid) anchors lipopolysaccharide (LPS) into the outer leaflet of the outer membrane of most Gram-negative bacteria. The highly anionic charge of the glucosamine lipid A moiety makes the LPS a powerful attractant for cationic antimicrobial peptides (AMPs). AMPs are major component of innate immunity that kill bacteria by permeabilization of lipid bilayers. Secondary lipid A acylation of Klebsiella pneumoniae, involving the acyltransferase LpxM (formally, msbB or WaaN) that acylates (KDO)2-(lauroyl)-lipid IV-A with myristate during lipid A biosynthesis, has been associated with bacterial resistance to AMPs contributing to virulence in animal models. We investigated here the role of the msbB gene of the entomopathogenic bacterium Photorhabdus luminescens in AMP resistance, by functional complementation of the AMP susceptible K. pneumoniae lpxM mutant with the P. luminescens msbB gene. We showed that msbB (lpxM) gene of P. luminescens is able to enhance polymyxin B, colistin and cecropin A resistance of K. pneumoniae lpxM mutant, compared to the non-complemented mutant. However, we could not obtain any msbB mutant of Photorhabdus by performing allelic exchange experiments based on positive selection of sucrose highly resistant mutants. We thus suggest that msbB-mediated Photorhabdus lipid A acylation is essential for outer membrane low-permeability and that modification of lipid A composition, fluidity and osmosis-resistance have an important role in the ability of Photorhabdus to grow in sucrose at high concentrations.
{"title":"A functional msbB acyltransferase of Photorhabdus luminescens, required for secondary lipid a acylation in gram-negative bacteria, confers resistance to anti-microbial peptides","authors":"Z. A. Khattar, S. Gaudriault, A. Givaudan","doi":"10.22453/LSJ-017.1.045056","DOIUrl":"https://doi.org/10.22453/LSJ-017.1.045056","url":null,"abstract":"Abi Khattar Z., S. Gaudriault and A. Givaudan. 2016. A functional msbB acyltransferase of Photorhabdus luminescens, required for secondary lipid a acylation in gram-negative bacteria, confers resistance to anti-microbial peptides. Lebanese Science Journal, 17(1): 45-56. Lipid A is a potent endotoxin, and its fatty acids (lauric, myristic, and sometimes palmitic acid) anchors lipopolysaccharide (LPS) into the outer leaflet of the outer membrane of most Gram-negative bacteria. The highly anionic charge of the glucosamine lipid A moiety makes the LPS a powerful attractant for cationic antimicrobial peptides (AMPs). AMPs are major component of innate immunity that kill bacteria by permeabilization of lipid bilayers. Secondary lipid A acylation of Klebsiella pneumoniae, involving the acyltransferase LpxM (formally, msbB or WaaN) that acylates (KDO)2-(lauroyl)-lipid IV-A with myristate during lipid A biosynthesis, has been associated with bacterial resistance to AMPs contributing to virulence in animal models. We investigated here the role of the msbB gene of the entomopathogenic bacterium Photorhabdus luminescens in AMP resistance, by functional complementation of the AMP susceptible K. pneumoniae lpxM mutant with the P. luminescens msbB gene. We showed that msbB (lpxM) gene of P. luminescens is able to enhance polymyxin B, colistin and cecropin A resistance of K. pneumoniae lpxM mutant, compared to the non-complemented mutant. However, we could not obtain any msbB mutant of Photorhabdus by performing allelic exchange experiments based on positive selection of sucrose highly resistant mutants. We thus suggest that msbB-mediated Photorhabdus lipid A acylation is essential for outer membrane low-permeability and that modification of lipid A composition, fluidity and osmosis-resistance have an important role in the ability of Photorhabdus to grow in sucrose at high concentrations.","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114717959","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 : 2016-06-27DOI: 10.22453/LSJ-017.1.037043
Imad Al Kassaa, Khaled El Omari, Marwa Saati, Bachar Ismail, M. Hamze
{"title":"Activités biologiques des extraits aqueux de Pergularia tomentosa L. (Asclepiadaceae)","authors":"Imad Al Kassaa, Khaled El Omari, Marwa Saati, Bachar Ismail, M. Hamze","doi":"10.22453/LSJ-017.1.037043","DOIUrl":"https://doi.org/10.22453/LSJ-017.1.037043","url":null,"abstract":"","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132734651","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 : 2016-06-27DOI: 10.22453/LSJ-017.1.075090
Sharif Jemaa, Perrine Cuvilliers, M. Bacha, G. Khalaf, R. Amara
{"title":"Étude du régime alimentaire de l’anchois européen (Engraulis encrasicolus) en Atlantique nord-est et en Méditerranée","authors":"Sharif Jemaa, Perrine Cuvilliers, M. Bacha, G. Khalaf, R. Amara","doi":"10.22453/LSJ-017.1.075090","DOIUrl":"https://doi.org/10.22453/LSJ-017.1.075090","url":null,"abstract":"","PeriodicalId":308244,"journal":{"name":"The Review of Laser Engineering","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133313262","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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