1,720,975 research outputs found
The effect of Tinospora crispa extract against Spodoptera exigua on Spinacia oleracea
No full textThe emergence of biodegradable pesticides as safe option has reduced the problems that result from the use of synthetic insecticides, thus creating a renewed interest in their development and use in integrated pest management of crops. The objective of this study was to investigate the insecticidal properties of the chloroform (CETC), ethanol (EETC), petroleum ether (PEETC) and ethyl acetate (EAETC) extracts of Tinospora crispa on small mottled millow moth (Spodoptera exigua) infesting spinach (Spinacia oleracea). The stem of the plants used in the experiment were collected from the locality, washed, shade dried, grind into powder and exhaustively extracted with four different solventsstarting with petroleum ether, followed by chloroform, ethanol, and ethyl acetate. A commercial pesticide, Cyperin (CCP) was included in the treatments as a standard check alongside the untreated (control). The experiment was laid out in a randomized complete block design (RCBD) with six treatments and four replicates. The efficacy of the treatments was based on reduction in Spodoptera exigua and percentage reduction in population of the pests. The results showed that EETC and PEETC significantly (p < 0.05) reduced the population of Spodoptera exigua at 61.2% and 51.6% respectively. Though the other twoCETC and EAETC were not significant in reducing the population of the pests, they were better than the control. All the extracts of Tinospora crispa tested were not as effective as the commercial pesticide, Cyperin, CCP (91.5%) in reducing Spodoptera exigua population. Among the tested extracts, EETC was found to be more effective, hence its use by resource poor farmers is recommended in the protection of Spinacia oleracea against the infestation of Spodoptera exigua
Methylene blue dye removal from aqueous solution by residue of Malaysian Saccharum officinarum
No full textSaccharum officinarum (sugarcane) is abundant agricultural by-products in Malaysia. In this study, bagasse (the residue of Malaysian saccarhum officinarum) was used as adsorbent for the removal of methylene blue (MB) from aqueous solutions. Batch studies were conducted to evaluate the adsorption capacity of unmodified bagasse (UMB) under different experimental conditions. Effect of various process parameterscontact time, initial metal ion concentration and adsorbent dosage have been studied for the removal of MB. Batch experiments were carried out at various dosage of adsorbent (0.2-2.0 g), initial MB concentration (10-50 mgl-1 and contact time (15-240) min. Then, the optimum conditions were applied to acid-modified bagasse (AMB) and base-modified bagasse (BMB) for the comparative study. The maximum MB removal capacity by UMB, BMB and AMB are 7.274, 5.599 and 5.514 mg g-1 respectively. Adsorption process was expressed by using Langmuir and Freundlich isotherm. A Langmuir isotherm curve was found to be significant compared to Freudlich isotherm. The results indicate that such bagasse without modification could be employed as low cost adsorbent in wastewater treatment for the removal of colour and dyes
FKK’s lecturer biography / Norain Isa
Full text linkWhat were your favorite and least favorite chemical engineering classes?
Favourite: Heat Transfer
Least favourite: Separation process
Other than chemical engineering, what field that you are interested to study?
Foods and music
What was the best memory of your time at UiTM?
My favourite memory at UiTM when / first met my husband at Level 9 during Misi Akademik meeting.
Where you will be in 10 years from now?
Successful lecturer with a balance between teaching and research
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
Synthesis colloidal Kyllinga brevifolia-mediated silver nanoparticles at different temperature for methylene blue removal
No full textDispelling 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
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