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Galvan, Sergio,Reggio, Marcelo,Guibault, Francois,Solorio, Gildardo Korean Society for Fluid machinery 2015 International journal of fluid machinery and syste Vol.8 No.4
The effect of the inlet swirling flow in a hydraulic turbine draft tube is a very complex phenomenon, which has been extensively investigated both theoretically and experimentally. In fact, the finding of the optimal flow distribution at the draft tube inlet in order to get the best performance has remained a challenge. Thus, attempting to answer this question, it was assumed that through an automatic optimization process a Genetic Algorithm would be able to manage a parameterized inlet velocity profile in order to achieve the best flow field for a particular draft tube. As a result of the optimization process, it was possible to obtain different draft-tube flow structures generated by the automatic manipulation of parameterized inlet velocity profiles. Thus, this work develops a qualitative and quantitative analysis of these new draft tube flow field structures provoked by the redesigned inlet velocity profiles. The comparisons among the different flow fields obtained clearly illustrate the importance of the flow uniformity at the end of the conduit. Another important aspect has been the elimination of the re-circulating flow area which used to promote an adverse pressure gradient in the cone, deteriorating the pressure recovery effect. Thanks to the evolutionary optimization strategy, it has been possible to demonstrate that the optimized inlet velocity profile can suppress or mitigate, at least numerically, the undesirable draft tube flow characteristics. Finally, since there is only a single swirl number for which the objective function has been minimized, the energy loss factor might be slightly affected by the flow rate if the same relation of the axial-tangential velocity components is maintained, which makes it possible to scale the inlet velocity field to different operating points.
A comparative study between trapezoidal combined footings and T-shaped combined footings
Garcia-Galvan, Marylu,Luevanos-Rojas, Arnulfo,Lopez-Chavarria, Sandra,Medina-Elizondo, Manuel,Rivera-Mendoza, Jose Benito Techno-Press 2022 Coupled systems mechanics Vol.11 No.3
This work presents a comparative study between two different models: trapezoidal and T-shaped combined footings. The comparative study between trapezoidal and T-shaped combined footings presented in this paper generatesresultsthat have an unparalleled accuracy for all foundation engineering problems. The main part of this research is to obtain the optimal area, reinforcing steel, and thickness of the trapezoidal and T-shaped combined footings using the new models. The comparison is made for two trapezoidal combined footings and two T-shaped combined footings ofreinforced concrete subjected to the same load.Themain findings are: themodelfortrapezoidal combined footings can be used for rectangular and triangular, and the T-shaped combined footings can be used for rectangular. The structure of the paper is asfollowsfirst a very complete state of the art with extensive referencesthat describesthe methodology used for the different models clearly, presents different numerical examples, results and at the end conclusions.
Everyday Transnationalism and the Postcolony in West Africa
Dennis Galvan 서울대학교 사회발전연구소 2010 Journal of Asian Sociology Vol.39 No.2
West Africa is a paradoxical region when it comes to the tension between the nationstate and the transnational. It stems from fundamental continuity of state power inherited from colonizers in postcolonial situations. The discursive grid of the postcolony is more robust than most observers would expect to find in a region like West Africa. Everyday, as opposed to formal-institutional, transnationalism turns out to be a more important. In West Africa, transnationalism is a tactical matter with regard to everyday life. There are not so much efforts to alter the discursive grid of the postcolony, but to begin to erect an alternative discursive grid, such as a joking kinship. Joking kinship ignores the discursive grid of the postcolony, and lays down in identity and imagination the basis for an entirely different, more transnational framework for political belonging.
Adsorption and Self-Assembly of Anticancer Antibiotic Doxorubicin on Single-Walled Carbon Nanotubes
Andres Rodríguez-Galvan,Oscar Amelines-Sarria,Margarita Rivera,Maria del Pilar Carreon-Castro,Vladimir A. Basiuk 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.4
We performed a combined experimental and theoretical study of the conjugates obtained from single-walled carbon nanotubes and anticancer antibiotic doxorubicin (DOX). Atomic force microscopy (AFM) imaging at lower magnification revealed, extended regions of single-walled carbon nanotubes (SWNTS) fully covered with DOX adsorbed molecules, along with some bare parts without the adsorbed drug, thus suggesting that the DOX adsorption is a cooperative process. Ambient atmosphere scanning tunneling microscopy (STM) at higher resolutions found that individual SWNTs-DOX conjugates exhibit a periodic texture, whose most important morphological feature is alternating depressions and protrusions along the nanotube. Based on the images and profiles measured, we suggest that doxorubicin molecules self-assemble on SWNTs sidewall according to a helical pattern, in which their tetracyclic fragments are turned with respect to the nanotube axis by about 50°. To provide an additional insight into the structure of noncovalent SWNTs-DOX conjugates, we employed density functional theory (DFT) calculations with three long-range corrected functionals: M05-2X, wB97X-D and LCBLYP, of which M05-2X yielded the most realistic results in terms of geometries and energies.
Katherine G. Holder,Bernardo Galvan,Andrew S. Knight,Freedom Ha,Reagan Collins,Preston E. Weaver,Luis Brandi,Werner T. de Riese 대한비뇨의학회 2021 Investigative and Clinical Urology Vol.62 No.4
Purpose: The negative correlation between BPH-size and incidence of prostate cancer (PCa) is well-documented in the literature, however the exact mechanism is not well-understood. The present study uses histo-anatomical imaging to study prostate volume in correlation to prostate capsule thickness, and glandular epithelial cell density within the peripheral zone (PZ). Materials and Methods: Specimens were selected from radical prostatectomies ranging from 20 to 160 mL based on ease of anatomical reconstruction by the slides. A total of 60 patients were selected and underwent quantitative measurements of prostate capsule thickness and glandular epithelial density within the PZ using computer-based imaging software. Pearson's correlation and a stepwise multiple linear regression analysis was conducted to determine the relationship between these measured parameters and the clinical characteristic of these patients. Results: Pearson's correlation analysis revealed a strongly significant, negative correlation between prostate volume and glandular epithelial cell density (r(58)=−0.554, p<0.001), and a strongly significant, positive correlation between prostate volume and average capsule thickness (r(58)=0.462, p<0.001). Results of multiple regression analysis showed that average glandular epithelial cell density added statistically to this prediction (p<0.05). Conclusions: The results suggest that growth of the transition zone in BPH causes increased fibrosis of the PZ, leading to atrophy and fibrosis of glandular cells. As 80% of PCa originates from the glandular epithelium within the PZ, this observed phenomenon may explain the inverse correlation between BPH and PCa that is well-documented in the literature.
Effects of Technological, Organizational, and Environmental Factors on Social Media Adoption
QALATI, Sikandar Ali,LI, Wenyuan,VELA, Esthela Galvan,BUX, Ali,BARBOSA, Belem,HERZALLAH, Ahmed Muhammad Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10
Electronic commerce is becoming a significant hub for sourcing products/services which helps organizations to connect with potential customers and gain competitive advantages, though little empirical work focuses on small businesses operating in developing countries to date. Increasingly, companies are looking to utilize social media to connect with stakeholders and pursue several benefits. This study aims to investigate the technological, organizational, and environmental (TOE) factors that influence small- and medium-sized enterprises' (SMEs) social media (SM) adoption in developing countries. This study used a closed-ended questionnaire to collect data from randomly-selected respondents (owners, executives, and managers) from SMEs in Pakistan. SMART PLS version 3.2.8 was used for path analysis of 316 responses and for structural equation modeling. The research findings include the direct influence of TOE factors (relative advantage, interactivity, visibility, top management support, and institutional pressure) on SMEs' SM adoption, and in turn SM adoption also has a positive influence on SMEs performance. Moreover, the coefficient of determination of the study showed that 77.7% of the variation in SM adoption occurs because of TOE factors and 29.8% variation in SMEs occurred because of SM adoption. This paper has implications for practitioners and scholars interested in exploring the SM adoption and usage by SMEs.
Sankaralingam, Muniyandi,Lee, Yong-Min,Pineda-Galvan, Yuliana,Karmalkar, Deepika G.,Seo, Mi Sook,Jeon, So Hyun,Pushkar, Yulia,Fukuzumi, Shunichi,Nam, Wonwoo American Chemical Society 2019 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.141 No.3
<P>Mononuclear nonheme manganese(IV)-oxo complexes binding calcium ion and other redox-inactive metal ions, [(dpaq)Mn<SUP>IV</SUP>(O)]<SUP>+</SUP>-M<SUP><I>n</I>+</SUP> (<B>1</B>-M<SUP>n+</SUP>, M<SUP><I>n</I>+</SUP> = Ca<SUP>2+</SUP>, Mg<SUP>2+</SUP>, Zn<SUP>2+</SUP>, Lu<SUP>3+</SUP>, Y<SUP>3+</SUP>, Al<SUP>3+</SUP>, and Sc<SUP>3+</SUP>) (dpaq = 2-[bis(pyridin-2-ylmethyl)]amino-<I>N</I>-quinolin-8-yl-acetamidate), were synthesized by reacting a hydroxomanganese(III) complex, [(dpaq)Mn<SUP>III</SUP>(OH)]<SUP>+</SUP>, with iodosylbenzene (PhIO) in the presence of redox-inactive metal ions (M<SUP><I>n</I>+</SUP>). The Mn(IV)-oxo complexes were characterized using various spectroscopic techniques. In reactivity studies, we observed contrasting effects of M<SUP><I>n</I>+</SUP> on the reactivity of <B>1</B>-M<SUP><I>n</I>+</SUP> in redox reactions such as electron-transfer (ET), oxygen atom transfer (OAT), and hydrogen atom transfer (HAT) reactions. In the OAT and ET reactions, the reactivity order of <B>1</B>-M<SUP><I>n</I>+</SUP>, such as <B>1</B>-Sc<SUP>3+</SUP> ≈ <B>1</B>-Al<SUP>3+</SUP> > <B>1</B>-Y<SUP>3+</SUP> > <B>1</B>-Lu<SUP>3+</SUP> > <B>1</B>-Zn<SUP>2+</SUP> > <B>1</B>-Mg<SUP>2+</SUP> > <B>1</B>-Ca<SUP>2+</SUP>, follows the Lewis acidity of M<SUP><I>n</I>+</SUP> bound to the Mn-O moiety; that is, the stronger the Lewis acidity of M<SUP><I>n</I>+</SUP>, the higher the reactivity of <B>1</B>-M<SUP><I>n</I>+</SUP> becomes. In sharp contrast, the reactivity of <B>1</B>-M<SUP><I>n</I>+</SUP> in the HAT reaction was reversed, giving the reactivity order <B>1</B>-Ca<SUP>2+</SUP> > <B>1</B>-Mg<SUP>2+</SUP> > <B>1</B>-Zn<SUP>2+</SUP> > <B>1</B>-Lu<SUP>3+</SUP>> <B>1</B>-Y<SUP>3+</SUP>> <B>1</B>-Al<SUP>3+</SUP> ≈ <B>1</B>-Sc<SUP>3+</SUP>; that is, the higher is Lewis acidity of M<SUP><I>n</I>+</SUP>, the lower the reactivity of <B>1</B>-M<SUP><I>n</I>+</SUP> in the HAT reaction. The latter result implies that the Lewis acidity of M<SUP><I>n</I>+</SUP> bound to the Mn-O moiety can modulate the basicity of the metal-oxo moiety, thus influencing the HAT reactivity of <B>1</B>-M<SUP><I>n</I>+</SUP>; cytochrome P450 utilizes the axial thiolate ligand to increase the basicity of the iron-oxo moiety, which enhances the reactivity of compound I in C-H bond activation reactions.</P> [FIG OMISSION]</BR>