1,721,006 research outputs found
Supasorb Adsorbents for Treatment of Dyespolluted Wastewater
No full textSaiful Azhar Saad and his team won bronze for Palm Composite: Composite Products from Palm Ash Waste. ITEX 2007, 18th - 20th May 2007 was held at Kuala Lumpur Convention Centre (KLCC), Kuala LumpurSupasorb is a carbon-based adsorbent designed to treat dyes polluted waterwaste discharge from industry
Sphogsorb: Biodegradable Adsorbent for Oil and Grease Trap
No full textSaiful Azhar Saad and his team won silver at ITEX 2007, 18th - 20th May 2007 was held at Kuala Lumpur Convention Centre (KLCC), Kuala Lumpur.SphogSORB is a carbon-based absorbent that can encapsulate oil and grease as well as most organic compounds on contact
Carbon from agricultural waste as an adsorbent in the removal of chromium and nickel ions from aqueous solution
No full textThe objectives of this study were to produce carbon from sugarcane bagasse and rice
straw by pyrolysis technique as an adsorbent for heavy metal removal and to determine
the optimum condition with respect to contact time, pH of solution, adsorbent doses,
particle sizes of adsorbent, initial metal concentration and temperature. Also adsorption
isotherm and adsorption kinetic behavior of nickel(II) and chromium(VI) removal by each
adsorbent will be determined.
Sugarcane bagasse and rice straw are inexpensive and locally available agricultural
waste. The raw materials were pyrolized at different temperatures ranging from 300 – 700
oC for 30 minutes with the average heating rate of 30 oC/minute.
The adsorbents were characterized for the yield, density, pH, ash content, moisture
content, surface area and porosity by using BET surface area and porosity analyzer,
functional groups by using Fourier Transform Infrared, surface morphology by using
Scanning Electron Microscope and element and chemical composition by using Energy
Dispersive X-ray.
Adsorptions were found to be effected by pyrolyzing temperature and surface area. The
adsorbents that produced at 700 oC have been chosen for this adsorption study because it
produced the highest percentage of removal.The maximum removal efficiency of Ni(II) on
RSC and SBC as 85.65% and 21.79 %, respectively and Cr(VI) on RSC and SBC as 61.81
% and 76.10 %, respectively.
The operation parameters included contact time (15 – 210 minutes), pH of solution (1.0 –
10.0), temperature (25, 30, 45 and 55 oC), particle sizes of adsorbents (1.18 mm, 600 µm,
300 µm and 150 µm), adsorbents doses (0.04, 0.10, 0.20, 0.40, 0.6 and 1.0 g) and initial
concentrations of adsorbates (10, 25, 50, 75 and 100 mg/L). The experimental tests were
conducted in batch process. The contact time, amount of adsorbent, temperature, particle
size of adsorbent and initial concentration of the metal ions solutions affect the adsorption
efficiency but most importantly depended on the pH of solution.
The experimental isotherms data were analyzed by using Langmuir and Freundlich
equation. The applicability of adsorption was described by using the Freundlich and
Langmuir adsorption isotherm. It was found that Langmuir isotherm model fit well the
data for nickel(II) and chromium(VI). The measured high linearity of correlation
coefficient, R2 and the values dimensionless separation factor, RL indicated a favorable
adsorption of both Ni(II) and Cr(VI) onto RSC and SBC, respectively. While, the
adsorption kinetics, pseudo-first order model, pseudo second order model and intra particle diffusion model were analyzed on the experimental kinetics data. It was found that
the pseudo second order kinetic model described the adsorption kinetic of both adsorbent
well. The performance of both adsorbent in the removal of nickel(II) and chromium(VI)
were also compared. It was found that the adsorption capacity of rice straw carbon on
nickel(II) was high may be due to the present of surface oxygen groups, surface charge,
high silica content and the properties of nickel. While, the adsorption capacity of
sugarcane bagasse carbon on chromium(VI) was high was caused by the high surface
area of the adsorbent, surface charge and the properties of chromium
SphosSORB: Formaldehyde-Impregnated Sphagnum Moss for Adsorption of Oil and Grease
No full textSaiful Azhar Saad dan ahli kumpulannya telah memenangi pingat gangsa di PECIPTA 2007 yang telah dianjurkan oleh Kementerian Pengajian Tinggi Malaysia (KPTM) dengan kerjasama Universiti Sains Malaysia Malaysia (USM), 10 - 12 Ogos 2007 di Pusat Konvensyen Kuala Lumpur (KLCC), Kuala LumpurOil and grease from food service facilities are defined as materials either liquid or solid, composed primarily of oil and grease from animal or vegetable sources. Oil and grease have poor solubility in water and tend to separate from the liquid solution. It decreases pipe capacity and requires the piping systems to be cleaned more often and worse, to be replaced sooner than otherwise expected. It also hampers effective treatment at the wastewater treatment plant
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
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