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Ordinary and thermal diffusion of moisture in activated alumina are investigated using a new diffusion cell design and scheme of analysis reported earlier. The specific form of the mass flux equation has a pronounced effect on the magnitude of the associated thermal diffusion ratio. In the case of activated alumina-moist air, if a partial pressure gradient is used, then the thermal diffusion term is small if not zero.Free, Knudsen and surface diffusion all play a part in the diffusion through activated alumina. However, surface diffusion makes the major contribution and for this reason the model in this case can be simplified to a two parameter surface model.The activation energy for surface diffusion is constant and is approximately equal to the mean isosteric heat of absorption. In addition, mean pore radius, turtuosity, and other physical constants are computed from the least square fit of experimental data. Furthermore, the model is theoretically consistent over the entire concentration range (0≦ CA ≦ CAsat).A new fact about activated alumina (Grade F1) it that it does not transfer moisture in a nonisothermal condition so long as the partial pressures of moisture on the two sides of the pellet are the same. There appears to be no previous report of this fact in the periodical literature. 相似文献
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Eul‐Kyoo Bae 《Performance Improvement Quarterly》2002,15(2):47-60
Despite the existence of many comprehensive and user‐friendly guides to evaluate training programs, most practitioners have had difficulty assessing training effects on corporate outcomes. Research revealed that trainees, organizational, and training‐related factors might influence the effectiveness of training in terms of organizational performance. The current study examines the effects of trainee characteristics among those factors, specifically what kind of trainee characteristics could affect training effectiveness in terms of job performance in a company. In addition, telephone surveys were conducted to aid in understanding of the reasons for leaving and high turnover of company personnel. The current and terminated employees who went through training programs in the company differed when considering previous sales experience in years and type of sales experience as trainee characteristics factors, with those still employed having a statistically higher average number of years and a higher rated type of sales experience. The current employees demonstrated higher job performance. The implications of these results on the attainment of training effectiveness as well as the selection decisions in the organization are discussed. 相似文献
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Eulàlia Collelldemont 《Paedagogica Historica: International Journal of the History of Education》2014,50(5):651-667
In recent years, visual records have come to be seen as important sources of information in the study of education and its history. However, most of the images used in this way simply provide a glimpse – though admittedly a precise one – of only one moment in the educational process. Graphic verisimilitude is not only to be found in these images; it might also be found in iconographic and symbolic representations that indicate not just the existence of the facts and phenomena represented, but also their significance. An example of this might be the study of the graphic and textual references to educational institutions that appear in maps. It is with the aim of discovering what these primary sources – maps and street plans – can teach us that we have carried out this study of the cartography of the city of Edinburgh in the seventeenth, eighteenth and nineteenth centuries, a period that saw great changes in both the urban geography of the city and in education. This article describes the rationale, processes and results of this study. 相似文献
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Eulàlia P. Abril Magdalena Kupczyk Grant L. Zwicke Ginnifer L. Mastarone Tracy Irwin Andrew Dykens 《Journal of Applied Communication Research》2013,41(2):242-262
Cervical cancer is the leading cause of women's cancer deaths in Senegal, but few medical personnel are trained to perform cervical cancer screening. In rural areas, the situation is worse. To remedy this, a collaborative of researchers and stakeholders trained local health-care workers in cervical cancer screening through the “training-of-trainers” method. However, lack of cancer screening knowledge, barriers, and a hard-to-reach population may jeopardize the collaborative's efforts. The purpose of this study is to map the health communication infrastructure by applying communication infrastructure theory to assess general health and cancer screening knowledge, as well as attitudes and barriers toward screening. Results from focus groups and interviews show that women have minimal knowledge of cervical cancer. Moreover, health workers report detrimental attitudes in menopausal women. Our findings identified routes for information dissemination and attitude change including community radio and local health talks. 相似文献
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This study seeks to analyze fear control responses to the 2012 Tips from Former Smokers campaign using the Extended Parallel Process Model (EPPM). The goal is to examine the occurrence of ancillary fear control responses, like humor. In order to explore individuals’ responses in an organic setting, we use Twitter data—tweets—collected via the Firehose. Content analysis of relevant fear control tweets (N = 14,281) validated the existence of boomerang responses within the EPPM: denial, defensive avoidance, and reactance. More importantly, results showed that humor tweets were not only a significant occurrence but constituted the majority of fear control responses. 相似文献
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A complete theory of diffusion of absorbing gases in porous solids is developed. Both ordinary and thermal diffusion are considered. The thermodynamics of irreversible processes is used to derive the general flux equations.A new theoretical model of surface diffusion is presented. Moreover, the proper method of combining surface and gas-phase fluxes is established. The total flux in the pores is represented by a 5 parameter model, which includes the effects of (1) free (gaseous) diffusion, (2) Knudsen diffusion, and (3) surface diffusion.The design of a new diffusion cell is presented along with a stagewise method for analyzing results. The cell is unique in that specimens mounted in copper clad circuit board material permits nonisothermal as well as isothermal operation. Earlier designs were confined to isothermal operation due to mounting specimens in metallic materials such as brass and aluminum. 相似文献
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Eulàlia Bassedas 《Cultura y Educación》2013,25(11-12):87-94
La necesidad de que los conceptos y signos matemáticos estén ligados desde sus inicios a actividades familiares y significativas es la idea que guía esta experiencia didáctica, en que la construcción de los conocimientos matemáticos en niños de 4 a 8 años se realiza en talleres con juegos habituales como la oca, el parchís o los naipes. 相似文献
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This article describes the application of Problem‐Based Learning (PBL) methodology in the context of a student congress, arguing that such new approaches to learning are best‐suited to the goals of the Bologna Process. The Congress in question enabled Spanish graduate students in Psychology, many of them mid‐career professionals, to increase their learning motivation, delve deeper into the learning experience, and further apply their learning and research. By taking an interdisciplinary approach, all the teachers concerned were able to coordinate their involvement. Feedback received from students and professors confirms that the Congress promoted new strategies and skills including self‐directed learning. 相似文献
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Eulàlia Collelldemont Conrad Vilanou 《Paedagogica Historica: International Journal of the History of Education》2017,53(3):228-245
AbstractRevisions of textual and audio-visual materials reveal the educational vision of Spanish anarchists. Through research, we have discovered the importance of aesthetical education and art in general for this protest political party. By studying the three key historical moments of the movement (1868–1939/ 1901–1910/ 1910–1936–1939) we have traced the evolution of the concept and practice of cultural learning. What stands out in the origins of the movement is the concern to introduce art and culture into school subjects while disseminating this knowledge to the whole population. Later, when the Modern School opened, the arts were introduced into the syllabus of teaching-learning. The aesthetic principles defended in the first period were turned into literary works with the aim of educating children from rationalist schools. Finally, we identify a time when the materials created by the Modern School were disseminated to working-class schools as a form of resistance against the politics proposed by government parties. The outbreak of the Civil War turned the corpus of aesthetical education into a cultural programme of demilitarised political resistance. 相似文献
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Eulàlia Hernández-Encuentra Modesta Pousada Beni Gómez-Zúñiga 《Educational gerontology》2013,39(3):226-245
This study examined the use that older, regular users of computers make of information and computer technology in their daily lives. Opinions from such users were obtained regarding what they want these technologies to offer them in the future. By means of a discussion group and an online questionnaire, our critical case examined a group of mature senior students from the Universitat Oberta de Catalunya (online learning) who have used computers and the Internet in their activities. In general, the participants needed to know the function of the tool beforehand and to have continued support and confidence. In particular, they need the certainty that the future technology will allow them to maintain their independence and autonomy. Older people's adoption of IT needs to be treated as more than merely a question of usability. Attitudes, experience of use, and perceived benefits are also key aspects that must be taken into account. 相似文献
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