186,209 research outputs found
Trace Metals in Water, Fish and Sediments from Elechi Creek, Port Harcourt, Rivers State, Nigeria
No full textThe concentration of trace metals: Cadmium (Cd), Lead (Pb), magnesium (Mn), Nickel (Ni) and Zinc (Zn) were determined in water, sediment and in the tissues of Sarontheron melanotheron, Tympanotonus fuscatus and Tilapia guineensis collected from Elechi creek in Port Harcourt, Nigeria. In sediments, the order of concentration was Cd=Ni<Mn<Pb<Zn while the order in water was Mn<Cd=Zn<Ni<Pd. The mean concentrations of the trace metals (mg/kg dry weight) in fin and shell fish samples ranged from 0.003–0.18 (Cd), <0.001 –2.3 (Pb), 0.004 -1.21 (Mn), 0.16-0.70 (Ni) and 0.09 –7.04 (Zn). Tympanotonus fuscatus recorded the lowest concentration of all the metals. The Pearson product moment correlation among the metals in water, fish and sediment samples showed that all metals positively correlated well (p<0.05). Fishes from Elechi creek were not heavily burdened with these trace metals, but aquatic environment should be monitored periodically to avoid excessive intake of trace metals by human.Keywords: Trace metals, Elechi creek, shell and fin fishes, Sediment
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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
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
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
Author Rights and Scholarly Publishing
Full text linkOriginally posted at
http://blog.library.gsu.edu/2014/10/24/author-rights-and-scholarly-publishing/</p
Förord [Elektronisk resurs]
No full textElechi Amadi’s (b. 1934) novel The Great Ponds is a stylized, only seemingly simple, story about a conflict between two Ikwerre villages (Niger Delta, today Rivers State, Nigeria). The conflict concerns to begin with an internal local wrestling match, a male skirmish, about fishing rights between ‘strong men’ and the leaders’ manipulative handling of the god systems, to escalate into an apocalyptic pandemonium of death with wonjo (1918), the Spanish Flu (La Grippe) as the catalyst. References to wonjo occur only at the very end of The Great Ponds, as if Amadi had resolved to position his story in a de-contextualized exclusive African enclave on the Atlantic coast, outside the history of the white man’s two century-long colonization of Ikwerre land and neighboring Igboland. This may have been his decision, only that a writer’s decision can be jammed by his book, which is the case here. Amadi wrote his story in 1969 while the Nigerian civil war, the Biafran War (1967-1970), was on going; the writer staunchly loyal with the Federal side throughout. The absence in The Great Ponds of ‘white men,’ ‘white religions,’ and the ’white decease’ (as the Spanish Flue has been identified as, only that it was global; 40,000 thousand died in Sweden and even more in Finland), it needs to be pointed out, only has a formal significance. The cruelties that embodied the breaking down of the two villages in the novel were underpinned by a series of ‘events’: one, the wonjo; second, the colonial wars that had been waged in the Niger Delta between the British and the Igbo ever since the first missionaries arrived in the 1850s; third, the Biafran War that positioned, sadly, Amadi– in theory – against Chinua Achebe, his colleague and friend. They were born and bred 150 km from each other; Achebe four years his older; they had been to the same prestigious colonial school, Government College, Umuahio; and were alumni at University College, Ibadan. An Ikwerre against an Igbo. No!Achebe’s Things Fall Apart (1958) engages the ‘white men’ and their religion; Achebe wrote a history about the colonial encounter. Amadi erased the Europeans. Amadi wrote an ethnographic allegory from within local belief systems. But more importantly, the two share the vision of what constitutes the foundation for not ‘falling apart,’ whether it is a group or an individual and a village like Chiolu (Amadi) or Umuofia (Achebe): the ability to talk, to negotiate, to compromise, and when rule systems violate the dynamism of change (impacted by neighbors, foreigners, or women), disobey the ‘rules,’ replace them! No god can breathe for long within the pages of a single volume! The once commensurate patriarchal system in The Great Ponds, based on concord and solidarity, disintegrated into religious fundamentalism, brutal violence, greed, and mercilessness, with the gods and their adjuncts in recalcitrant partnership. It was not wonjo’s fault!</p
Application of QPSK-OFDM for Improved Underwater Wireless Communication System
No full textThe problems of signal loss and poor channel estimation are inherent in underwater communication. In this work, underwater communication system has been improved using Orthogonal Frequency Division Multiplexing (OFDM) system with quadrature phase shift keying (QPSK) based on modulation scheme. The modern choice of underwater communication system, where the available bandwidth was divided into many overlapping sub-channels, such that the symbol duration was compared to the multipath spread of the channe
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