1,720,965 research outputs found
Influence of seawater pollution on corrosion of Iron-Carbon alloy
No full textOrganized by Malaysian Society of Marines Sciences, National Oceanogrpahy (Ministry of Science, Technology & the Environment Malaysia) & Institute of Biological Sciences (University of Malaya), 12th - 16th May 2002 at Hotel Istana, Kuala Lumpur, Malaysia.Seawater pollution has been identified as a potential danger to metallic materials used under service conditions. Seawater foulants have adequate corrosive environment due to chemical ingredients especially halides compounds. Overall bacterial activity also results in the formation of highly aggressive sulphur bearing compounds, free sulphide, and ammonia in seawater. The corrosion behaviour of Fe-C alloy in the Laboratory has been investigated in presence of seawater. The deposition of fouling debris and biofouling were studied. The foulants have deleterious effect on the protectivity of the surface and rapid degradation of the alloy is noted; The scales morphologies were determined by Scanning Electron Microscopy techniques
Aluminium parts from scrap using new technique
No full textLink to publisher's homepage at http://www.ultrascientist.org/A new method for making aluminium parts using scrap under Asian condition has been suggested. The new technique is known as Powder Metallurgy (P/M) and is the technology of future. The process is economic, clean, requires less energy, creates no waste, gives better properties as compared to conventional shaping processes
Oxidation behaviour of AISI-316 steel in molten ionic salts at 650-1000-C
No full textLink to publisher's homepage at http://www.ultrascientist.org/Sodium sulphate (Na2S04) sodium meta-vanadate (NaV03) and its binary combination on the hot corrosion behaviour of AISI-316 steel in the temperature range 650-1000°C have been studied in flowing air The influence of NaV03-coated steel showed much higher oxidation rates than Na,S04-coated steel. This has been attributed to the decomposition of salt into volatile oxide, V,Os and it appeared to the sole reason for catastrophic corrosion. The addition of Na,S04 to NaV03 lowered the oxidation rate of coated steel due to nonformation of volatile product in the temperature range 650-IOCO°C. The tests included mass change monitoring, and oxide scale analysis by X-ray diffraction studies
Characteristics of corrosion product films of copper alloy in South China Seawater
No full textOrganized by School of Chemical Engineering (USM) & Institution of Chemical Engineers Malaysia, 29th-30th December 2003 at Copthorne Orchid Hotel, Tanjung Bungah, Penang, Malaysia.The corrosion behaviour of Copper-base alloy was investigated in three different states south china seawater at 50 & 70 0 C for the period of 10 h in atmospheric condition. A procedure was applied to measure the pH of the seawater at elevated temperature. The sucesceptibility to suffer a deep attack by internal oxidation increases with increasing temperature and time. A mechanism involving chloride & oxygen dissolution in the alloy matrix as well as internal oxidation, exhibits mass gains throughout the experiment. Immersed in south china seawater, the alloy of incomplete recrytallisation showed thick, loose and porous films, of which the inner layer was metallic oxides/chlorides and the outer layer contained a great amount of seawater species, and of which the underlying substrate was found with severe inter-granular corrosion. Over all, the south china seawater species have deleterious effect on the surface of the alloy and rapid degradation is noted. The scale morphologies were determined by Optical and Scanning Electron Microscopic techniques
MODIFICATION OF THE PREPARATION BISILYLATED TETRATHIOPHENE BY THE COUPLING METHOD WITH CHLOROMETHOXYSILANE
No full textNANOSTRUCTUR STUDIES OF CHARGE TRANSFER COMPLEXES (CTC) IN MATERIALS OF TERTHIOPHENE BISILYLATED AND TCNQBY X-RAY POWDER DIFFRACTION
No full textRemoval of Eriochrome Black T DYE from Aqueous Solution by Nickel/Aluminium Layered Double Hydroxide
No full textBatik industry is well known in the East Coast of Malaysia, particularly in Terengganu and Kelantan. This industry consumes a lot of water for the batik making process which contributes to high discharge of wastewater containing excess dye pollutants. Hence, in this study, an anionic clay of nickel/aluminium-layered double hydroxide (NiAL) was investigated as a potential adsorbent for the removal of anionic dye of Eriochrome Black T (EBT). The NiAL was synthesized via self-assembly method and characterization of NiAL was carried out using powder X-ray diffraction (PXRD) and Fourier transform infrared spectrophotometer (FTIR). The composition and morphology of NiAL was further analyzed using carbon, hydrogen, nitrogen, sulphur elemental analyzer (CHNS), thermogravimetric analyzer (TGA) and scanning electron microscope (SEM). The potential of NiAL as an adsorbent for the removal of EBT in aqueous solution was tested at different dosages of NiAL. The adsorption ability was analyzed by using two common adsorption isotherms, which were Langmuir and Freundlich models. The adsorption of EBT onto NiAL was governed by Freundlich isotherm model indicating that the adsorption occurs in heterogeneous system
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
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