1,721,131 research outputs found
Adaptive signal processing techniques and condition monitoring of rotating machines
No full textThe condition monitoring of complex rotating machines using vibrational signature analysis methods has been given considerable attention in recent years. The ability to diagnose a mechanical fault is enhanced if the monitoring signal can be preprocessed to reduce the effect of unwanted noise. In this work two methods have been suggested for improving the signal to noise ratio of a diagnostic signal from rotating machines. Both methods make use of an adaptive filtering process which is based on the Least Mean Square algorithm of Widrow and Hoff. Apart from the primary input which contains the corrupted signal, both these methods make use of an auxiliary or a reference input. The first method is referred to as conventional Adaptive Noise Cancelling (ANC) and is applicable in those situations where the reference input contains noise correlated with the primary input noise. The second method which is a modified ANC is proposed for those situations where the primary and reference inputs contain correlated signals and uncorrelated or weakly correlated noises. Applying both techniques to simulated as well as actual machine data, it has been shown that conventional statistical and spectral analysis techniques can be made more effective in their diagnostic roles after the application of ANC. The second part of this research is related to the estimation of the structure of the vibrational data. The Widrow-Hoff adaptive algorithm has been used to obtain the coefficients of a linear prediction filter. The structure obtained using this method has been compared with those obtained from the conventional linear prediction, Homomorphic deconvolution and the Maximum Likelihood method. It is shown that the removal of structure from a three dimensional plot may help in the trend analysis of faults in the low frequency region.</p
Review The Overlap between Irritable Bowel Syndrome and Non-Celiac Gluten Sensitivity: A Clinical Dilemma
No full textAbstract: The spectrum of gluten-related disorders has widened in recent times and includes celiac disease, non-celiac gluten sensitivity, and wheat allergy. The complex of symptoms associated with these diseases, such as diarrhea, constipation or abdominal pain may overlap for the gluten related diseases, and furthermore they can be similar to those caused by various other intestinal diseases, such as irritable bowel syndrome (IBS). The mechanisms underlying symptom generation are diverse for all these diseases. Some patients with celiac disease may remain asymptomatic or have only mild gastrointestinal symptoms and thus may qualify for the diagnosis of IBS in the general clinical practice. Similarly, the overlap of symptoms between IBS and non-celiac gluten sensitivity (NCGS) often creates a dilemma for clinicians. While the treatment of NCGS is exclusion of gluten from the diet, some, but not all, of the patients with IBS also improve on a gluten-free diet. Both IBS and NCGS are common in the general population and both can coexist with each other independently without necessarily sharing a common pathophysiological basis. Although the pathogenesis of NCGS is not well understood, it is likely to be heterogeneous with possible contributing factors such as low-grade intestinal inflammation, increased intestinal barrier function and changes in the intestinal microbiota. Innate immunity may also play a pivotal role. One possible inducer of innate immune response has recently been reported to be amylase-trypsin inhibitor, a protein present in wheat endosperm and the source of flour, along with the gluten proteins
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
sj-docx-1-ggm-10.1177_23337214231194965 – Supplemental material for Association Between Cognitive Performance and Nutritional Status: Analysis From LASI-DAD
No full textSupplemental material, sj-docx-1-ggm-10.1177_23337214231194965 for Association Between Cognitive Performance and Nutritional Status: Analysis From LASI-DAD by Manjusha Bhagwasia, Abhijith R. Rao, Joyita Banerjee, Swati Bajpai, Aruna V. Raman, Arunanshu Talukdar, Arvind Jain, Chhaya Rajguru, Lalit Sankhe, Debabrata Goswami, Ganapathy Sankaralingam Shanthi, Govind Kumar, Mathew Varghese, Minakshi Dhar, Monica Gupta, Parvaiz A-Koul, Rashmi Ranjan Mohanty, Sankha Shubhra Chakrabarti, Sathyanarayana Raju Yadati, Sharmistha Dey and Aparajit Ballav Dey in Gerontology and Geriatric Medicine</p
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
M. G. K. Menon (1928–2016)
No full textMambillikalathil Govind Kumar Menon (MGK or Goku to friends) passed away peacefully on 22 November 2016 at his residence in New Delhi, India. He was 88 years old. Menon made pioneering contributions to particle physics and successfully implemented a grand vision for the scientific and technological growth of India
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