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Synthesis of Ag and Cd nanoparticles by nanosecond-pulsed discharge in liquid nitrogen

Frontiers of Chemical Science and Engineering 2019年第2期13卷 360-368页

作者： Mahmoud Trad Alexandre Nominé Natalie Tarasenka Jaafar Ghanbaja Cédric Noel malek tabbal Thierry Belmonte Universite de Lorraine CNRSIJLF-54000 NancyFrance B.I. Stepanov Institute of Physics National Academy of Sciences of BelarusMinskBelarus Department of Physics American University of BeirutBeirutLebanon

The synthesis of CdO, Ag2O (5nm) and Ag (~20~30 nm) nano-objects is achieved simultaneously by nanosecond-pulsed discharges in liquid nitrogen between one cadmium electrode and one silver electrode. Oxidation occurs when liquid nitrogen is fully evaporated and nanoparticles are in contact with the air. No alloy is formed, whatever the conditions, even though both elements are present simultaneously, as showed by timeresolved optical emission spectroscopy. This lack of reactivity between elements is attributed to the high pressure within the discharge that keeps each metallic vapor around the electrode it comes from. Each element exhibits a specific behavior. Cubic Cd particles, formed at 4 kV, get elongated with filamentary tips when the applied voltage reaches 7 and 10 kV. Cd wires are formed by assembly in liquid nitrogen of Cd nanoparticles driven by dipole assembly, and not by dielectrophoresis. On the contrary, silver spherical particles get assembled into 2D dendritic structures. The anisotropic growth of these structures is assumed to be due to the existence of pressure gradients.

关键词： spark discharges submerged discharges timeresolved optical emission spectroscopy liquid nitrogen

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Phenotypic Variation within a Jordanian Landrace of Durum Wheat ＂Safra Ma＇an＂（Triticum turgidum L, var, Durum）

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Journal of Agricultural Science and Technology(B) 2013年第10期3卷 717-727页

作者： Jalal Ahmad Al-tabbal Mahmud Ayed Duwayri Department of Applied Science AI-Huson University College AL Balqa' Applied University Al-Huson 2151 O Jordan Department of Horticulture and Crop Science Faculty of Agriculture University of Jordan Amman 11942 Jordan

Two hundred and eighty six lines were selected randomly from the tetraploid wheat （Tritieum turgidum *** Durum） landrace ＂Safra Ma＇an＂. The whole population with three check cultivars （ACSAD 65, HOURANI 27 and AMRA） was evaluated at Maru Agriculture Research Station for 16 characters including grain yield per plant. The objectives were to assess the magnitude of phenotypic variations for the traits in ＂Safra Ma＇an＂ and to evaluate the potential usefulness of some of the traits identified. Results showed wide range of phenotypic variation for several traits. Monomorphism was common for juvenile growth habit, whereas, the rest of the characters exhibited polymorphism in varying degrees. Considering all characters, the average diversity （H＇） for ＂Safra Ma＇an＂ landrace was 0.65 ± 0.047. Ten lines were superior to the check （HOURANI 27） for grain yield per plant. Subsequently, the population lines were clustered into six distinct groups at a distance of about 0.55 based on their similarity for all traits, ACSAD 65 and AMRA located in separate clusters, whereas, HOURANI 27 cultivar was presented in cluster with the most lines of ＂Safra Ma＇an＂. Thirteen lines from the population showed a bluish green cast or glaucousness characters. Glaucous lines had greater kernels per spike. In contrast, this character showed no significant association with grain yield per plant despite the greater grain yield per plant obtained for the glaucous lines. The results are important for the breeding and selection in this land race.

关键词： Safra Ma'an landrace Triticum turgidum variation glaucousness.

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大样本阿拉巴马州焊接工帕金森综合征的患病率及其与暴露的关系

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世界核心医学期刊文摘（神经病学分册） 2005年第6期1卷 40-41页

作者： Racette B.A. tabbal S.D. Jennings D. 赵睿 Washington University School of Medicine Box 8111 660 S. Euclid Ave. St. Louis MO 63110 United States Dr.

Objective: To estimate the prevalence of parkinsonism in welders in Alabama and to compare this prevalence with that in a general population sample. Methods: The authors screened 1,423 welders from Alabama who were referred for medical- legal evaluation for Parkinson disease (PD). Standardized videotaped assessments using the Unified Parkinson’ s Disease Rating Scale motor subsection 3 (UPDRS3) were obtained. Patients provided information regarding exposure to welding fumes and job titles. Job titles were matched with Department of Labor Standard Occupational Codes (SOCs). Diagnoses were assigned based on quantitative criteria for the diagnosis of PD using two thresholds for diagnosis. With use of the number of active welders in this screening with parkinsonism as the numerator and the age- adjusted number of welders in each SOC as the denominator, the prevalence of parkinsonism in Alabama welders was estimated using conservative assumptions and compared with general population data from Copiah County, MS. Results: With use of conservative and liberal case definitions of parkinsonism, the estimated prevalence of parkinsonism among active male welders age 40 to 69 statewide was 977 to 1,336 cases/100,000 population. The prevalence of parkinsonism was higher among welders vs age- standardized data for the general population (prevalence ratio = 10.19, 95% CI 4.43 to 23.43). Conclusion: The estimated prevalence of parkinsonism was higher within a sample of male

关键词：帕金森综合征阿拉巴马州焊接工评分量表诊断阈值定量诊断男性居民劳工部密西西比州年龄标准

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