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Léa Elias Mendes Carneiro Zaidan,Joan Manuel Rodriguez-Díaz,Daniella Carla Napoleão,Maria da Conceição Branco da Silva de Mendonça Mon,Alberto da Nova Araújo,Mohand Benachour,Valdinete Lins da Silva 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
We examined the photocatalytic degradation of phenol from laboratory samples under UV radiation by using BiPO4/H2O2 and TiO2/H2O2 advanced oxidation systems. Both catalysts prepared were characterized by scanning electron microscopy, Fourier transform infrared and X-ray diffraction. Surface area tests showed about 3.46 and 31.33m2·g−1, respectively, for BiPO4 and TiO2. A central composite design was developed with the following variables-- catalyst concentration, time and concentration of hydrogen peroxide--to optimize the degradation process. Removal rates of 99.99% for phenol degradation using BiPO4 and TiO2 were obtained, respectively. For mineralization of organic carbon were obtained 95,56% when using BiPO4 and 63,40% for TiO2, respectively. The lumped kinetic model represented satisfactorily the degradation of phenol process, using BiPO4/H2O2/UV (R2=0.9977) and TiO2/H2O2/UV (R2=0.9701) treatments. The toxicity tests using different seed species showed the benefits of the proposed advanced oxidation process when applied to waste waters containing these pollutants.
Dana, Elias D.,Lomas, Juan Garcia De,Sanchez, Jose The Korean Society of Weed Science and The Turfgra 2010 Weed Biology and Management Vol.10 No.3
In this study, the effects of aqueous extracts from Zygophyllum fabago L. on two plant phytopathogenic fungal species (namely, Fusarium oxyosporum f. sp. melonis and Pythium aphanidermatum) were studied under laboratory conditions. The plant extracts (10% w/v) were prepared by using deionized water and fresh tissues. Dilutions (2, 4, 6, and 8% w/v) were obtained to test their effect on the mycelial growth of the phytopathogenic species. Additionally, the recovery of the fungi after their exposure to the Z. fabago extract was analyzed. The plant extracts inhibited the growth of F. oxyosporum and P. aphanidermatum (the maximum mean inhibition that was recorded with the 10% w/v extracts was 42.9% and 85.3%, respectively). A second series of experiments demonstrated the existence of residual effects in both species. The amount of residual inhibition by the 10% w/v extracts was 28.6% in F. oxyosporum and 53.8% in P. aphanidermatum. A dose-response was clearly observed in P. aphanidermatum, while an increase in extract concentration was not associated with a significantly greater reduction in the growth of F. oxyosporum. These findings give insights into the potential of Z. fabago as a growth inhibitor of F. oxyosporum and P. aphanidermatum, thus suggesting an interesting potential role for this common weed as a source of natural fungicides.
Zhao, W.,Shan, C.,Elias, A.L.,Rajukumar, L.P.,O'Brien, D.J.,Terrones, M.,Wei, B.,Suhr, J.,Lu, X.L. Pergamon Press ; Elsevier Science Ltd 2015 Carbon Vol.95 No.-
To expand the applications of carbon nanotubes (CNTs) at macroscale, a heteroatom doping technique has been employed to fabricate isotropic 3-D CNT architectures by inducing elbow-like covalent junctions into multiwalled CNTs. As the junctions modify the topology of each CNT by favoring the stable bends in CNTs, junction stiffness and the consequence of junction-related morphology changes in sponge's hyperelasticity remain largely elusive. In this study, two types of 3-D multiwalled CNT sponges were fabricated by inducing boron-doped or nitrogen-doped covalent junctions into CNTs. Hyperelastic properties of the sponges were experimentally quantified as the functions of CNT morphology. A novel microstructure informed continuum constitutive law was developed specifically for such isotropic CNT sponges with junctions. Analyzing the experimental data with the new theory demonstrated that, for the first time, the effective modulus of boron-doped junctions (~100 GPa) is higher than that of nitrogen-doped junctions (~20 GPa), and the junction stiffness is a key factor in regulating the hyperelastic compressive modulus of the material. Theoretical analysis further revealed that increased number of junctions and shorter segments on each individual CNT chain would result in stronger hyperelastic 3-D CNT networks. This study has established a fundamental knowledge base to provide guidance for the future design and fabrication of 3-D CNT macrostructures.
Kistler, H. C.,Alabouvette, C.,Baayen, R. P.,Bentley, S.,Brayford, D.,Coddington, A.,Correll, J.,Daboussi, M.-J.,Elias, K.,Fernandez, D.,Gorden, T. R.,Katan, T.,Kim, H. G.,Leslie, J. F.,Martyn, R. D. 충남대학교 생물공학연구소 1999 생물공학연구지 Vol.7 No.-
Fusarium oxysporum Schlechtend.:Fr is a cosmopolitan fungal pathogen (4) responsible for wit and cortical rot diseases of more than 100 economically important plant hosts (3). Genetic diversity within F. oxysporum has been categorized extensively by vegetative compatibility grouping in laboratories around the world. Detailed studies indicate that isolates belonging to the same vegetative compatibility group (VCG) typically possess very similar or identical multilocus haplotypes and belong to the same clonal lineage(19). VCG. therefore, can be good predictors of genetic similarity, clonal lineage. or both. In this communication, we propose a standardization of the system currently used for categorizing genetic diversity within this taxon. Our primary objective is to make the system more understandable and useful by reducing ambiguity and increasing the rigor with which the current system is applied. A secondary goal of this undertaking is to promote international communication and cooperation in this endeavor.
Elias Towe,D Pal,L L. Chen 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
This paper addresses two issues in the use of quantum dots in the active regions of optoelectronic devices. The first issue is the observed blue-shift of the emission wavelength of structures that are otherwise characterized to be suitable for laser action at the long wavelength of 1.3 $\mu$m. Because of subsequent heating of the quantum-dot layers at much higher temperatures than they were originally synthesized at, the emission wavelength of the dots is changed. The second issue relates to the requirement for absorbing carriers in the active region of mid-infrared detectors. Introduction of these carriers by impurity doping may not necessarily be the best approach since it is difficult to precisely incorporate just the right density of dopant impurity atoms. An alternative approach that utilizes carrier injection from the device ohmic contact layers is suggested.
An Advanced Lithium–Air Battery Exploiting an Ionic Liquid-Based Electrolyte
Elia, G. A.,Hassoun, J.,Kwak, W.-J.,Sun, Y.-K.,Scrosati, B.,Mueller, F.,Bresser, D.,Passerini, S.,Oberhumer, P.,Tsiouvaras, N.,Reiter, J. American Chemical Society 2014 NANO LETTERS Vol.14 No.11
<P>A novel lithium–oxygen battery exploiting PYR<SUB>14</SUB>TFSI–LiTFSI as ionic liquid-based electrolyte medium is reported. The Li/PYR<SUB>14</SUB>TFSI–LiTFSI/O<SUB>2</SUB> battery was fully characterized by electrochemical impedance spectroscopy, capacity-limited cycling, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The results of this extensive study demonstrate that this new Li/O<SUB>2</SUB> cell is characterized by a stable electrode–electrolyte interface and a highly reversible charge–discharge cycling behavior. Most remarkably, the charge process (oxygen oxidation reaction) is characterized by a very low overvoltage, enhancing the energy efficiency to 82%, thus, addressing one of the most critical issues preventing the practical application of lithium–oxygen batteries.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-11/nl5031985/production/images/medium/nl-2014-031985_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5031985'>ACS Electronic Supporting Info</A></P>
Salah Khardani,Elias Ould Saïd,Mohamed Lemdani 한국통계학회 2010 Journal of the Korean Statistical Society Vol.39 No.4
Let (Ti)1≤i≤n be a sample of independent and identically distributed (iid) random variables (rv) of interest and (Xi)1≤i≤n be a corresponding sample of covariates. In censorship models the rv T is subject to random censoring by another rv C. Let θ(x) be the conditional mode function of the density of T given X = x. In this work we define a new smooth kernel estimator ˆθn(x) of θ(x) and establish its almost sure convergence and asymptotic normality. An application to prediction and confidence bands is also given. Simulations are drawn to lend further support to our theoretical results for finite sample sizes.
Luigi Petramala,D’Elia Lorenzo,Gino Iannucci,Antonio Concistré,Laura Zinnamosca,Cristiano Marinelli,Giuseppe De Vincentis,Antonio Ciardi,Giorgio De Toma,Claudio Letizia 대한내분비학회 2015 Endocrinology and metabolism Vol.30 No.4
Background: Cushing syndrome (CS) has been described as a killing disease due its cardiovascular complications. In fact, chronic cortisol excess leads to a constellation of complications, including hypertension, hyperglycemia, adiposity, and thromboembolism. The main vascular alteration associated with CS is atherosclerosis. Methods: Aim of this study was to analyze carotid intima-media thickness (cIMT) and ankle-brachial index (ABI), two surrogate markers of subclinical atherosclerosis in a consecutive series of CS patients, compared to patients with essential hypertension (EH) and health subjects (HS). Results: Patients with CS showed a significant increase (P<0.05) of cIMT (0.89±0.17 mm) compared to EH (0.81±0.16 mm) and HS (0.75±0.4 mm), with a high prevalence of plaque (23%; P<0.03). Moreover, CS patients showed a mean ABI values (1.07±0.02) significantly lower respect to HS (1.12±0.11; P<0.05), and a higher percentage (20%) of pathological values of ABI (≤0.9; P<0.03). Conclusion: In conclusion, we confirmed and extended the data of cIMT in CS, and showed that the ABI represent another surrogate marker of subclinical atherosclerosis in this disease.