127 research outputs found
A randomized controlled trial to evaluate the role of postoperative strict prone positioning for one day versus three days in anatomical closure of idiopathic full thickness macular hole: a preliminary study
No full text<p>A randomized controlled trial to evaluate the role of postoperative strict prone positioning for one day versus three days in anatomical closure of idiopathic full thickness macular hole: a preliminary study. Rajpal Vohra, Rajive Kumar, Koushik Tripathy, Pradeep Venkatesh, S. N. Dwivedi, Rajvardhan Azad<br>The 2nd Asia-Pacific Glaucoma Congress held in conjunction with the 10th International Symposium of Ophthalmology – Hong Kong (APGC-ISOHK 2014 Hong Kong)<br>2014-09 | conference-paper</p>
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Low-rank high-volatile matter sub-bituminous coal grinding versus power plant performance
No full textThesis (M.S.) University of Alaska Fairbanks, 2005The objective of this project was to determine if the power plant performance, characterized by megawatt and steam generation, is reduced when particle size distribution (PSD) of pulverized-coal fed into the burners is made slightly coarser. Tests were conducted in two phases at a Golden Valley Electric Association power plant. During the first phase, two tests were conducted at significantly different PSDs. Results indicated that coarser distribution did not hurt plant performance. Later, the second phase was carried out to test the repeatability of the observed combustion behavior as well as to test hypotheses on mill power consumption, emissions and unburned carbon. Unfortunately, the three tests in this phase did not result in statistically different PSD's, precluding any conclusions on the main objective. Therefore, further tests are needed to establish the effect of coarser PSD on power plant performance, emissions, unburned carbon and mill power consumption.Introduction -- Coal and coal properties -- Coal pulverization and coal firing -- Coal combustion -- Power plant description : Healy no. 1 -- Sample collection and analysis -- Results and discussion -- Conclusions and future recommendations -- References
Three dimensional computational fluid dynamics models of pollutant transport in a deep open pit mine under Arctic air inversion and mitigation measures
No full textDissertation (Ph.D.) University of Alaska Fairbanks, 2015As open pit mines continue to grow deeper and productivity continues to increase, the management of air pollution can become challenging. One of the challenges, common during winter in deep open pit mines operating in the Arctic, is the occurrence of atmospheric inversion. In itself, inversion is not hazardous. However, due to the emission of gases and particulates during the mining process, the air within the pit can be severely contaminated, rather quickly, leading to serious health and safety consequences. The problem is complex and any solution approach will require a good understanding of the interaction of the aerodynamic movement of air, the air inversion process, the meteorology, the pollutant sources, and the application of mechanical ventilators in open pit mines. Scientific literature related to open pit mine ventilation, particularly with respect to air inversion, is practically non-existent in the English literature. This is perhaps the first account of a three dimensional computational fluid dynamics (CFD) model of pollutant transport in an actual open pit mine under an Arctic air inversion. Advanced technology has made computers faster and more powerful, which allows computational fluid dynamics (CFD) procedures to be applied to many air flow problems. Thus, a CFD approach can be used to understand the transport of contaminant in the pit during inversion by using several turbulence models. An array of data is required to develop CFD models for open pit mine ventilation. The meteorological conditions within deep open pit mines are significantly affected by temperature and roughness conditions, which ultimately generate complex dispersion phenomena including separation of air flow and its recirculation. For the application of CFD, various data such as pollutants concentrations, temperature, velocity, pit contours, equipment locations, and radiation (shortwave and longwave) were collected from the selected open pit mine and the weather stations located nearby. Analysis of the weather data showed that inversions are due to elevated inversions in the selected open pit mine. Because an exact flow situation in open pit mines is not known a-priori, open pit air flow simulation and pollution transport are often highly sensitive to the type of flow model employed. It is therefore necessary to investigate various turbulent models to identify the appropriate model that will simulate the flow phenomena with reasonable accuracy and predict the contaminant distributions within the pit. Dispersion models differ in their assumptions and structures as well as in the algorithm used and as a result, predictions vary from model to model. Furthermore, it is also important to investigate the behavior of a CFD model when simulating complex phenomena, such as the transport and distribution of contaminants in an open pit mine under an Arctic air inversion. The simulation of an enhanced period of turbulence in the stable boundary layer (SBL) is of particular interest because traditional air pollution dispersion models cannot explicitly treat intermittent turbulence events, and yet the SBL is often the worst-case scenario in open pit pollution transport.Realizable κ-ε and Large Eddy Simulation (LES) models were used for understanding flow of gaseous contaminants. The 2010 pit configuration was used to develop models for understanding the gaseous transport under air inversion. During an inversion, turbulence is dominant at the bottom of the pit, while in the middle portion of the pit turbulence is intermittent and flow over the upper portion of the pit is mostly laminar. The realizable κ-ε model tends to over-predict the contaminant concentration, whereas, the LES model under-predicts the level of pollutant concentrations. Validation of the developed model was performed using the 2013 pit configuration. Despite the complex synoptic situations, the different meteorological input data and the fast changing conditions, the simulation results from the validation model were in good agreement regarding the dispersion of pollutants and other turbulent variables. Pollutant concentration values in the selected locations showed differences, but remained within the same order of magnitude in most cases. Removal of the harmful pollutants from the pit is significantly important for the health and safety of the mine workers. The mitigation models were developed for both the 2010 and the 2013 pit configurations. Several remedial measures such as the use of mechanical ventilators in forcing and exhaust mode, push-pull ventilation and a novel approach of using cloud cover were considered. Mitigation efforts employing mechanical means were unsuccessful in removing or diluting the contaminants to a safe level. The novel approach of using cloud cover over an open pit mine showed promise. With this approach, the model showed that the inversion could be lifted and pit could be cleared of all pollutants
Research Productivity of Scientometrics Journal during 2010-2019
No full textThe present research paper is based on the bibliometric analysis of 3218 documents published in 'Scientometrics' from 2010 to 2019. The paper carried out various parameters of Bibliometrics such as total publications, totally cited publications year wise share of publications top productive authors, top countries in terms of research output, and top cited articles of the journal. The study concluded that the most productive year is 2018 with 398 (12.36%) publications and China produced the highest research output (22.37%) is on top and Bornmann, L. from Germany is the most productive author with 73 publications. KU Leuven is a top institution and produced 114 publications
Graph Cut Based Local Binary Patterns for Content Based Image Retrieval
No full textIn this paper, a new algorithm which is based on the graph cut theory and local binary patterns (LBP) for content based image retrieval (CBIR) is proposed. In graph cut theory, each node is compared with the all other nodes for edge map generation. The same concept is utilized at LBP calculation which is generating nine LBP patterns from a given 3—3 pattern. Finally, nine LBP histograms are calculated which are used as a feature vector for image retrieval. Two experiments have been carried out for proving the worth of our algorithm. It is further mentioned that the database considered for experiments are Brodatz database (DB1), and MIT VisTex database (DB2). The results after being investigated shows a significant improvement in terms of their evaluation measures as compared to LBP and other existing transform domain techniques. Keywords: Feature Extraction; Local Binary Patterns; Image Retrieva
Hybrid Algorithm Using Fuzzy C-Means and Local Binary Patterns for Image Indexing and Retrieval
No full textCultural diversity in Chinua Achebe\u27s Things Fall Apart
No full textWhen we hear about Africa we start thinking about cultural diversity in this region. Here people have special affinity for their own choices and this is one of the prime reasons that they are developing. These all likes and dislikes create their culture and strongly affect their mode of life. However, coming to Africa by Europeans obstructed culture, pollution and in addition of variations. This exploration analysis in Chinua Achebe\u27s "Things Fall Apart" on the basis of masculinity and cultural clash (traditional versus Western) as bought by westernization. The accounting of Investigation is scientific and narrative, using the formalist approach. That is looking at the actions, events, sentences and reciprocal action or influence of the characters in order to recognize and discuss how males are represented, paying attention to the issues of cultural realism, behaviors, actions and statements of the characters. The outcome of the research assured that African viewpoint of masculinity and culture tends to be against that of the Europeans, as the actions and behaviors suitable for a man in its society tend to differ. This led two unlike clashes from cultural, religious, ideological to social beliefs. The analysis reached at the conclusion that cultural clashes enter in the work and contributed to the final playout of the story, where the traditional belief system had to make way for western ones; making Things fall apart. The exploration reveals that the male characters have both individual masculine idiosyncrasies, cultural and that the complications of male roles establish the truth the pluralistic and unreliable nature of masculinity
Knowledge Sharing Idiosyncrasies of Research Scholars at CCS Haryana Agricultural University, Hisar, India
No full textThe main aim of the present study is to investigate the knowledge sharing behaviour of research scholars at Chaudhary Charan Singh Haryana Agricultural University (CCS HAU), Hisar, India. To understand and reveal the knowledge sharing idiosyncrasies of research scholars, various factors have been covered such as knowledge sharing definition, knowledge sharing attitude, communication channels preferred for knowledge sharing, barriers of knowledge sharing, knowledge sharing motivators, and other factors related to knowledge sharing in an academic institution. For the present study, survey method was adopted with the aid of online structured questionnaire for the purpose of data collection. Total 125 research scholars were approached electronically and shared questionnaires through WhatsApp groups and personal e-mails. Out of total 125, 114 valid questionnaires were collected and considered for final analysis, which representing the response rate of about 91.2 per cent. The findings reveals that about 66% of the respondents were in the opinion that sharing knowledge with peers shall benefit all and majority of the respondents possessed a positive attitude towards knowledge sharing and were aware of its importance in their learning process. The face-to-face interaction for sharing knowledge among the respondents is the most preferred communication channel for majority of the respondents (81.58%); however, some major barriers of knowledge sharing among the research scholars have also been noticed. In order to overcome these barriers, the researchers suggest that academic institutions may foster cordial relationship among the research scholars by providing sufficient interaction opportunities. In the end, practical implication of this study has also been discussed
AWARENESS AND USE OF SOCIAL MEDIA AMONG PG STUDENTS OF CCS HARYANA AGRICULTURAL UNIVERSITY, HISAR
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The present paper reflects the status of awareness and use of social media tools among PG students of CCS Haryana Agricultural University, Hisar. For collecting data questionnaire technique was adopted wherein 60 questionnaire were distributed among PG students. The results shows that 100 percent respondants were aware and using social media tools in the University. Facebook, Watsup and Youtube were the most used social media tools; preffered device for using social media was smartphone; prefered place was home or hostel; and main difficulties in using social media tools were academic pressure & restriction of using social media in computer labs of University
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