11,622 research outputs found
Social Prosperity Perception in Cultural Tourism Destinations: the Case of Peña de Bernal, Huejotzingo and Yuanhuitlán, México
The present quantitative study with a descriptive design tries to determine the conditions of "social prosperity" of three Mexican cultural tourist destinations, Yanhuitlán, Huejotzingo and Peña de Bernal. These places face similar conditions in aspects like marginalization and poverty but with activities like tourism have tried to reverse these adverse conditions. The objective was to know the perception of their population about the improvement of their living conditions as a result of the tourist activity through the application of surveys carried out in the chosen destinations. The instrument used was a questionnaire with a Likert scale to facilitate the response of the informants and the processing of the information. For the validity and reliability of the measurement instrument a factor reduction analysis and a Cronbach's alpha were elaborated, after which a one-way ANOVA was elaborated to know the differences of means taking the Bonferroni and Scheffe tests. The results show a significant difference between the averages of destinations in how residents perceive prosperity in the selected tourist destinations
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Direct Metal Laser Fabrication of Cu Slabs from Powder Precursor: Surface Depth of Melt and Furnace Temperature Issues
A DMLF processing unit based on a raster-scanned 80 W CO2 laser beam has been
developed to process single layers of metallic powder precursor. The process chamber
provides atmosphere control (high vacuum and inert gas refill) besides temperature
elevation up to 700 o
C. In this work, copper powder precursor is confined inside a
refractory steel mask surrounded by an aluminum oxide jacket that acts as insulator. The
powder layers can have thicknesses of 0,5 and 1 mm. An infrared pyrometer measures
in real time the temperature at one location in the surface of the powder bed. Scan
speed, scan step, and furnace temperature have been varied to find combinations of such
parameters that render surface melting and maximum densification. Partially melted
samples were produced and their mass density was measured. Micro-hardness and
surface roughness were also measured along the resolidified surface, the first rendering
an average of 80,6 HV compared to the 90-105 HV of oxygen free copper, while the
second resulting in an 8 μm Ra value. Maximum melt of depth achieved is ~0,15 mm
followed by a sintered layer.Mechanical Engineerin
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Solidification Morphology Analysis of SLM of Cu Powder
The solidification morphology analysis of fine Cu powder melted by a raster
scanned energy beam from a focused Nd:YAG laser is presented here. The powder was
processed inside of sealed chamber where it was subjected to a high vacuum cycle. The
laser fusion process consisted raster scanning a narrow rectangular pattern with a high
density of scanning lines, the chamber was purged with inert gas during the process. Up
to a 3.3 mm/s laser travel speed and maximum laser power level of 240 W were used to
melt a 2 mm thick bed of loose powder. The resulting solidified ingots were separated
into categories based on their shape integrity. Metallographic analysis by means of
optical microscopy and scanning electron microscopy was performed on the cross section
and longitudinal section of the ingots with homogeneous surface and complete shape
integrity. Characterization revealed an elongated columnar grain structure with a grain
orientation along the direction of the laser travel direction, some degree of porosity was
observed too in some of the specimens. It was observed that grains diameter ranged from
10 to 100 µm and contained a two phase eutectic microstructure of copper and it oxides.
Oxygen content was accounted from a 5.5 up to 8.1 atomic percent, a small percentage of
chlorine was present, too. A 2 to 8 percent variation in the Vickers microhardness values
were found between the different specimens when measured along the longitudinal
section. These HV values corresponded to approximate 20-25% cold rolled oxygen free
copper (80-90 HV). The ingots thus produced suggest that a multilayer structure from Cu
powder could be build by the SLM process having sufficiently adequate compositional,
microstructure and mechanical properties for functional applications.Mechanical Engineerin
Fleur de sel: how does a pinch of suitable choice practices value this sustainable natural resource?
As mechanized processes developed, small producers of traditional sea salt ceased to
be competitive. However, when the valuable salt flower (a.k.a. fleur de sel, flower of salt) market
appeared, it gave new breath to the activity of traditional salt pan production. Salt flower sensitivity
and delicateness became a part of modern food habits. Its crystals present some grain differentiation
and these can fulfill diversified consumer tastes. In cooking art, a regular fine flower of salt can be
used to finish dishes, whereas a longer and thin grain known as ‘scale’ (a.k.a. écaille de fleur de sel in
French) can be used for a more gourmet-like palate. Here a suitable method is presented to sort and
grade flower of salt to satisfy different palates. The method of salt flower selection is based on four
main characteristics, which should be considered: cleansing, moisture, color, and size. It is the grain
size that contributes most to demand allocation. The results show that what is produced (supply)
and the demand from customers do not exactly match. The tiniest types of salt flower are usually
completely absorbed by the market, whereas the largest types have no market at all.info:eu-repo/semantics/publishedVersio
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Mechanical Behavior of SLS Components in Relation to the Build Orientation During the Sintering Process as Measured by ESPI
Selective Laser Sintering (SLS) allows producing real parts from CAD data from materials with
different characteristics compared to the final model, presenting dissimilar mechanical properties
between the prototype and the product. The purpose of this work is to correlate the mechanical
behavior of beam-type specimens produced by SLS with build orientation angle used as a process
parameter, also attempting to demonstrate how this parameter affects the accuracy of the
Empirical Similitude Method (ESM). ESM presents itself as a valuable tool when creating scale
models with SLS, specifically in the framework of evolutionary product design. More
specifically, the Young modulus variation of test specimens of well-known dimensions and
material (DuraformTM PA2
), will be characterized by loading them within the elastic range. The
resulting elastic deformations will be measured using the technique of Electronic Speckle Pattern
Interferometry (ESPI) for small deformations in an out-of-plane configuration, contrasting these
results with the elastic theory of deformations. As a main result, it was found that there exists a
linear correlation between the build angle and the elastic modulus of the parts. Secondly, it was
demonstrated empirically that the ESM predicts better the mechanical response of the part than
TSM. Moreover, a 30% error reduction can be achieved within the ESM when using the build
orientation angle as a process parameter.Mechanical Engineerin
Latent segmentation of older adults in the use of social networks and e-banking services
Introduction. This study analyses heterogeneity in the online behaviour of elderly people.
Previous research has centred on the socio-demographic segmentation of the elderly regarding
their Internet use.
Method. The novelty that this study adds is in determining this segmentation through variables
that have been especially chosen for studies of the elderly and which are related to their
utilitarian use of e-banking, compared to the more hedonic nature of using online social
networks.
Analysis. The sample was collected using 474 students over 55 years old enrolled in a class of
experience in a University in the South of Europe (Spain). We use a latent class cluster model
which is appropriate in situations of a posterior segmentation.
Results. In dealing with such behaviour in situations of the elderly using these technologies, we
have detected the presence of five groups or segments with highly differentiated use-related
profiles concerning the variables analysed: venturesomeness, technology anxiety and selfconfidence
in information and communication technologies use.
Conclusion. We discover the existence of heterogeneity in the behaviour of the elderly
regarding services available in Internet. The results support the idea proposed. The stereotype of
the elderly cut off from technology is mistaken, as is shown by the different segments found
¿No hay eco en el eco?. El memoricidio de la Nakba y sus resistencias
La Nakba de 1948 significó el desarraigo del pueblo palestino, la desmembración de su país y la destrucción de gran parte de la Palestina árabe. Sin embargo, este fenómeno histórico ha sido negado sistemáticamente por el relato oficial sionista-israelí. Se ha llevado a cabo lo que puede denominarse como un 'memoricidio', es decir, la eliminación física de los elementos identitarios del pueblo palestino, el intento de borrar su paso por la tierra y la pretensión de acabar con su memoria colectiva. Pero la Nakba tiene una importancia primordial en las resistencias palestinas, que han desarrollado numerosas estrategias para salvaguardar la cultura palestina y reivindicar el derecho al retorno de los refugiados reconocido por la Asamblea General de la ONU
ISO 9001 Quality Management Systems: Critical Analysis of Literature Review
Purpose and Methodology/Approach: This paper follows a previous one focused on a bibliographic review of motivations,
benefits and difficulties in implementing quality management systems (QMS) based on ISO 9001 standard (Saraiva et al, 2017).
Controversial, conflicting and even contradictory, and/or non-consensual findings in same or different countries have suggested
other dimensions were lacking. So, a further and critical analysis was deepened in order to identify possible flaws in dimensions of
analysis and in methodological issues, which is the scope of this paper.
Findings: Many research works were based on perceptions/opinions (eg. motivations, benefits, difficulties) and tangible results
were missing, being conclusions built only on qualitative data. Quantitative data were not used to objectivize and validated
qualitative findings. Physical or economic indicators rarely were presented. Researchers may not have asked for quantitative data
or even ignore these aspects of organizational reality, or the organizations also do not have this type of data. It is hard to
corroborate statements (from company’s managers) or findings (from researchers) without other objective evidences (examples are:
motivations influence the QMS performance; cost reduction is a benefit; the biggest difficulties in implementation/certification of
QMS are the excessive and complex (bureaucratic) documentation, the weak commitment to quality by management and staff, the
high cost/scarce resources and the time spent with the additional tasks for the implementation process; organizations operating an
ISO 9001 QMS show a better performance).
Another matters such as the relative size of the certification phenomenon in each country or region and their economic and social
development were generally unknown or were not taken into account. These contextual factors can distort findings.
The scientific affiliation of researchers (eg. Industrial engineering, Management, Sociology, Organizational psychology) may also
have implications for the research perspective and aspects that are privileged in analysis and conclusions.
Research Limitation/implication: Additionally, other methodological issues can also be related to data collection instruments (eg.
questionnaires to collect perceptions/opinions) are not the most appropriate for achieving some desired information or data
processing does not validate conclusions. Thus, we will take into account in our future research these limitations we have identified
in this one and strongly recommend to other researchers our conclusions.
Originality/Value of paper:These reflections and findings suggest further and deeper work for research in QMS and other related topics, looking for those
dimensions already identified as missing, and/or considering more dimensions, bearing in mind concerns that quality movement is
losing popularity, because it does not appear to managers consistently with quantitative data proving contributions of quality to
increase productivity and competitiveness. Finally, we raise methodological questions about research on these topics, and other
dimensions of analysis are recommended
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