196,127 research outputs found
Location of chlorogenic acid biosynthesis pathway and polyphenol oxidase genes in a new interspecific anchored linkage map of eggplant
No full text© Gramazio et al.; licensee BioMed Central. 2014. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.NHM Repositor
EXPERIMENTAL RESULTS BY IR-THERMOGRAPHY ON CONVECTIVE HEAT TRANSFER OVER ENHANCED SURFACES
No full textThis paper presents experimental results on convective heat transfer of air flows over a not-thin aluminum plate with transverse, straight ribs for different pitch-to-rib-side ratio values. Data over a flat plate are also reported for comparisons. The plate is 200 mm long and 150 mm wide, and it is heated by a thin foil heater; ribs have a square cross-section of 3-mm side. The paper first reviews the experimental setup and the data processing to recover heat transfer characteristics from IR-thermographic images; then, thermal performances of tested configurations, namely, pitch-to-rib-side ratio ranging from 10 to 40, are presented and discussed. Air flows at room temperature with speed from 2.3 to 11.6 m/s, corresponding to Reynolds numbers at the end of the heated-length between 50000 and 250000, and for a heat flux of near 550 W/m2. For the considered ribbed surfaces, the average Nusselt number shows an increase with respect to the flat plate varying from 45 to 130% as Re increases but with slight differences between them
SDR Technology Applied to Galileo Receivers
No full textIt has been worldwide recognized that under the push of the research activity related to Galileo and to the future GPS (Global Positioning System), the satellite navigation market is growing in importance for different civil applications. In order to deal with future developments and improvements of GNSS, advanced receiver architectures providing the enhanced performances will be needed. For these reasons, it is interesting to devise smart approaches to the design of navigation receivers assuring a certain degree of reconfigurability and portability in order to deal with new GNSS scenarios (e.g., integration between navigation and communication services). In this paper we discuss a receiver architecture based on Software Defined Radio (SDR) technique. The main peculiarity of SDR is to allow for developing of flexible devices in which the receiver functionalities are softwareimplemented in a modular architecture. The present technology does not allow a totally software receiver, but the development of fast and reliable electronics make the SDR approach an interesting perspective. Note that great attention has been devoted to the applicability of SDR techniques in order to design reconfigurable personal communication terminals, leaving unexplored the potentialities of SDR for other terminals as navigation receiver, or integrated hybrid communications/navigation receivers. The main objective of this work is to explore innovative approaches and new technologies in the area of satellite navigation receivers that will allow satisfying the needs and the constraints of future application, presenting the main advantages given by the availability of a SDR navigation terminal. As example, the possibility to design an efficient M-code receiver (based on Binary Offset Carrier modulation – BOC) has been analyzed: on the basis of the Galileo SIS definition (Signal-In-Space), the SDR approach can be used in order to implement a modular structure compliant with an open system architecture concept, based upon high sampling rate Analog to Digital Converters (A/D), reconfigurable hardware (Field Programmable Gate Array - FPGA) and high speed Digital Signal Processors (DSP
Does Sex Really Sell? Paradoxical Effects of Sexualization in Advertising on Product Attractiveness and Purchase Intentions
No full textTo test the “sex sells” assumption, we examined how Italian men and women react to sexualized advertising. Women showed lower product attractiveness and purchase intentions toward products presented with sexualized female models than with neutral ads, whereas men were unaffected by ads’ sexualization (Study 1, n = 251). Study 2 (n = 197) replicated the overall results. Study 3 (n = 198) tested hostile sexism as a moderator as well as negative emotions as a mediator of consumers’ responses. Especially men with higher hostile sexism showed more purchase intentions after viewing female sexualized ads than neutral ads. Moreover, women’s lower consumer responses toward sexualized female ads were due to higher negative emotions. Study 4 (n = 207) included ads with both female and male models, replicating responses to female sexualization and showing that both women and men had lower product attractiveness and purchase intentions toward male sexualized ads than neutral ads. Replicating and extending Study 3’s results, women’s negative emotions was the mediator. The present study has practical implications for marketers because it suggests that “sex does not sell.” In addition, considering both the psychological damage and practical inefficacy of sexualized ads, our findings have important implications for public policy
Personal determinants of pharmaceuticals products online
No full textOur study examines psychological and sociodemographic variables that might influence the intention to
purchase pharmaceuticals online. Online questionnaires examining variables in Ajzen’s (1991) Theory of
Planned Behavior, as well as personal variables such as stimulating risk taking and safety perception (i.e.,
perception of the behavior as safe for health), were used for the purpose of the study. Results of hierarchical
regressions and of structural equation modeling showed that attitude and subjective norm were the main determinants
of future purchase intention. A significant effect was found also for past behavior and for safety
perception. Safety perception, moreover, resulted the more important determinant of attitude and of
subjective norm, thus exerting a significant and great indirect impact on future purchase intention. Propensity
to risk and age showed a significant but moderate direct effect on attitude and subjective norm but only
a modest indirect effect on future purchase intention. Public stakeholders may capitalize on these results to
orient their communication campaigns. In particular, messages stressing the risk of health may lower the
positive attitude toward the purchase of medicines online, and then the intention to purchase those products
online
Accuracy in evaluating convective heat transfer coefficient by RANS CFD simulations in a rectangular channel with high aspect ratio and 60° tilted staggered ribs
No full textA numerical analysis of heat transfer characteristics of an air flow through a narrow rectangular channel of 1:10 aspect ratio with ribbed surfaces has been carried out, by means of a CFD commercial code, exploiting Reynolds Averaged Navier-Stokes (RANS) equations. The channel is 120 mm wide, 840 mm long, with 60° tilted staggered ribs. Ribs have a square cross section with two different side heights (2 mm and 4 mm) and three different values of dimensionless pitch (10, 20 and 40). The numerical results have been compared with experimental data obtained by the authors inside a ribbed channel both with same geometry and operating conditions as one numerically modelled. Agreement between numerical and experimental data on convective global heat transfer coefficient, i.e., averaged over the whole channel, is discussed for the six different configurations considered. Moreover, performances are presented by considering at the same time both heat transfer enhancement and pressure-drop penalization, highlighting strengths and weaknesses per each configuration. This work is aimed at finding a suitable configuration of a CFD model with RANS that will allow authors to apply it to the range of dimensionless pitches and side heights during early design-phases of parametric studies
Morphology and Solidity Optimization of Freeform Surface Turbulators for Heat Exchangers Equipped with Narrow Channels
No full textImproving the thermal performance of compact heat exchangers is a key challenge in the development of energy-efficient systems. This work investigates the use of topology optimization to generate novel surface geometries that enhance thermal efficiency specifically in narrow rectangular channels. A physics-based topology optimization software, ToffeeX, has been employed to explore turbulator designs within defined spatial and material constraints. The optimization process has focused on maximizing heat transfer, with particular attention on the effect of solid volumetric fraction. Simulations have been carried out using the CFD tools of the optimization software to evaluate the thermal behavior of the proposed configurations. Among the tested designs, a solid volumetric fraction of 8% has led to the most effective solution, achieving a 25% increase in outlet fluid temperature compared to a conventional ribbed reference configuration. Validation using CFD simulations with another package, OpenFOAM, has confirmed these results, showing consistent trends across methodologies. These findings highlight the potential of combining topology optimization with numerical simulation to develop advanced geometries for heat transfer enhancement. The proposed approach supports the development of more efficient and compact heat exchangers, paving the way for future experimental studies and broader industrial applications
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Indicazioni delle tecniche da associare agli interventi di artrorisi temporanea della sottoastragalica.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
- …
