1,721,029 research outputs found
Acoustic properties of natural fiber reinforced composite micro-perforated panel (NFRC-MPP) made from cork fiber and polylactic acid (PLA) using 3D printing
Full text linkThe present study investigated the acoustic performance of biodegradable MPP absorbers made of natural fiber-reinforced composites (NFRC) using 3D printing. The novelty of this current research lies in the recent development of a methodology that aids industry professionals in optimizing the production of MPP (Micro-Perforated Panel) at a competitive cost. This is achieved by addressing and eliminating various issues commonly faced in traditional manufacturing processes, such as manual preparation and pressing. The FDM technique was used to fabricate test samples utilizing the PLA/corkwood composite. Using an impedance tube device with two microphones, the acoustic absorption coefficients of MPPs with different perforation diameters, thicknesses, and perforation rates were measured. Maa's analytical model was used to predict the acoustic absorption performance. Moreover, considering the average sound absorption and total cost of fabricating the samples, RSM-CCD was employed to optimize these samples. In the end, the parallel arrangement of MPP double layer and the combination of MPP with kenaf porous material were tested in order to improve the sound absorption performance. The results showed that the average sound absorption coefficient of the NFRC-MPP sound absorber is 25 % more than that of conventional MPP sound absorbers. The sample with a perforation diameter of 0.70 mm, a panel thickness of 0.90 mm, and an 8 mm distance between the perforations was selected as the optimal sound absorber. The measurement and model data for NFRC-MPP panels do not correspond well. The parallel arrangement of two layers of MPP and the addition of an optimized kenaf layer behind the MPP significantly improved the sound absorption performance in the intended frequency range. The findings of this study, coupled with data available in the literature for other types of biocomposite Micro-Perforated Panel (MPP), strongly indicate that Cork fiber-based MPP exhibits substantial promise for application, either independently or in conjunction with Kenaf materials, as a material for acoustic conditioning. Implementing smart manufacturing techniques for acoustic panels not only enhances engineering noise control efforts but also amplifies the overall effectiveness of Hearing Conservation Programs
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Successful Aging into the 21st Century: The Social and Built Environment as Facilitators or Barriers for Individuals Aging with Disability
No full textUp to 21% of Americans are aging with a disability acquired at birth or within the first 4-5 decades of life. Their disability trajectory and life course experiences make them a distinct group of older adults with a disability. They have higher risk of age-related chronic diseases and secondary conditions stemming from their disability, and face barriers to navigating their communities. Their limited mobility means they may be more reliant on their environments to facilitate good health. However, little is known about the role of the environment in successful aging for this population.
This dissertation addressed this gap by examining the relationship between features of the environment and quality of care and health outcomes for individuals aging with a physical disability. The cohort was identified using claims data from a national private health insurance database and linked to neighborhood data from the National Neighborhood Data Archive (NaNDA).
The first Aim examined specific features of the built environment pertinent to this population, and their association with incident cardiometabolic disease. Residence in neighborhoods with a high density of recreational establishments, parks, broadband internet connections, and transit stops was associated with lower risk of any cardiometabolic disease. Neighborhoods with a high density of “health promoting” resources were protective for cardiometabolic health but no significant findings were observed for “health harming” establishments. Density of healthcare establishments was not independently associated with cardiometabolic health, suggesting that other factors such as quality of care experiences, not the presence of healthcare establishments per se, may be important to consider.
The second Aim of this dissertation characterized quality of care, measured using Bice-Boxerman continuity of care (COC) index, and identified the associated individual and community-level factors. This population had low COC scores, indicative of more fragmented care, and saw a variety of provider specialties. Those with high COC had a greater proportion of visits concentrated amongst two specialties (Family & Internal Medicine). Living in less affluent communities, and having less access to transit, broadband internet and health care providers (e.g., Medical Specialists) was associated with more concentrated care patterns. Residence in neighborhoods with fewer healthcare establishments was associated with lower odds of continuous care. Environments that facilitate access to many health care providers afford readily available opportunities to seek care from different sources to meet health preferences and needs; though it may lead to more fragmented care patterns. Examination of health outcomes is required to better understand the effect of these care patterns.
Aim three examined the association between COC and diagnosis of chronic health conditions and receipt of preventive screening. After adjusting for individual and community-level confounders, high continuity was associated with lower odds of pain diagnosis and receipt of preventive screening. Effects were more salient in younger adults (<40 years).
In concert, these dissertation Aims highlight the role of the neighborhood environment in understanding quality of care patterns and health outcomes for individuals aging with a physical disability. Neighborhood-level interventions should focus on investment in health-promoting resources. Innovative policies that consider factors outside the healthcare system are required to avert fragmented care in this population, with important implications for supporting appropriate screening and early disease detection for younger adults aging with disability. This work has the potential to support neighborhood designs, policies and programs that facilitate the ability of this population to age successfully in place.PhDEpidemiological ScienceUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/171429/1/anammk_1.pd
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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