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排序方式: 共有182条查询结果,搜索用时 15 毫秒
1.
Kannapiran Nagarajan Muthusamy Athianna Meena Sher Singh 《Journal of Inorganic and Organometallic Polymers and Materials》2021,31(8):3441-3459
Journal of Inorganic and Organometallic Polymers and Materials - Different concentrations of ZnFe2O4 and manganese substituted ZnFe2O4 nanoparticles (10%, 20% and 30%) dispersed... 相似文献
2.
Kamaraj Premkumar Bairavan Veerayan Manikandan Chellappan Agees Kumar 《电力部件与系统》2017,45(20):2304-2317
In this paper, Antlion algorithm optimized Fuzzy PID supervised on-line Recurrent Fuzzy Neural Network based controller is proposed for the speed control of Brushless DC motor. Learning parameters of the supervised on-line recurrent fuzzy neural network controller, i.e., learning rate (η), dynamic factor (α), and number nodes (Ni) are optimized using Genetic algorithm, Particle Swarm optimization, Ant colony optimization, Bat algorithm, and Antlion algorithm. The proposed controller is tested with different operating conditions of the Brushless DC motor, such as varying load conditions and varying set speed conditions. The time domain specifications such as rise time, overshoot, undershoot, settling time, recovery time, and steady state error and also integral performance indices such as root mean square error, integral of absolute error, integral of squared error, and integral of time multiplied absolute error are measured and compared for above optimized controller. Simulation results show Antlion algorithm optimized Fuzzy PID supervised on-line recurrent fuzzy neural network based controller has proved to be superior than other considered controllers in all aspects. In addition, the experimental verification of proposed control system is presented to test the effectiveness of the proposed controller with different operating conditions of the Brushless DC motor. 相似文献
3.
Angayarkanni J Palaniswamy M Murugesan S Swaminathan K 《Journal of Bioscience and Bioengineering》2002,94(4):299-303
The pectinase enzymes isolated from Aspergillus spp., A. indicus, A. flavus and A. niveus were used for fermentation of tea leaves. The enzymes were purified and characterized. The effect of both crude enzyme preparation and purified pectinase enzymes on the improvement of tea leaf fermentation were determined in terms of theaflavin, thearubigin, high polymerized substances, total liquor colour, dry matter content and total soluble solids of the tea produced. The crude enzyme preparations obtained from ethanol precipitation were found to be more effective in improving tea leaf fermentation than the purified pectinase enzymes. 相似文献
4.
Polyaniline (PANI) was synthesized by chemical oxidative polymerization of aniline dissolved in aqueous phosphoric acid. The polymer was characterized by UV–Visible spectroscopy (UV–Vis), thermal gravimetric analysis (TGA) and Fourier transform infrared spectroscopic (FTIR) techniques. Hardener free epoxy coating was formulated with 10% PANI. The curing process of epoxy resin by PANI was analyzed using FTIR and a suitable mechanism of curing was suggested. The corrosion protective performance of conventional polyamide cured epoxy and PANI cured epoxy coating on steel has been assessed in 3% NaCl by electrochemical impedance spectroscopy (EIS). The self-healing property of the PANI cured epoxy coating on steel in 3% NaCl was studied by scanning vibrating electrode technique (SVET). 相似文献
5.
Fretting fatigue is an adhesive wear mechanism caused by repetitive tangential micro-oscillation between two contacting materials
pressed together under cyclic load. Bioimplants, such as hip joints and bone plates, are prone to undergo fretting fatigue
failures during their service within the body. This article presents the fretting fatigue damage characterization of physical
vapor deposition (PVD) TiN-coated biomedical titanium alloys (Ti-6Al-4V and Ti-6Al-7Nb) subjected to cyclic loads. The PVD
TiN layer delayed the damage because of superior tribological properties compared with uncoated alloys. Delamination and abrasive
wear damage of TiN at contact caused failure of the alloy. Friction coefficient curves of the PVD TiN-coated pair showed an
irregular pattern caused by the influence of wear particulates and Ringer fluid at the contact. 相似文献
6.
S. Dhanasekaran Aravind Vadiraj G. Balachandran M. Kamaraj 《Transactions of the Indian Institute of Metals》2010,63(5):779-785
Austempering of a ferrite-pearlitic grade of ductile iron was carried out to assess the potential use of the material for
crank shaft application reported. A commercial material was austempered at 340°C to realize the properties. The austempered
ductile iron gave good strength although the ductility values were lower. The material developed had complete ausferritric
structure free of pearlite. The various phase constitution and phase transformation associated with the treatment and during
mechanical deformation was examined. Using XRD analysis the volume fraction of the austenite in the matrix was estimated.
The various aspects of processing a commercial cast iron during ausetmpering, the phase transformation, microstructural evolution
have been examined along with the property of the material. The mechanical behaviour of the material and the scope for further
improvement is discussed. 相似文献
7.
Alloyed gray cast iron of varying compositions was studied for their wear behavior. In general, the alloyed gray irons studied have higher graphite volume fraction (∼20%) with Type-A graphite flake morphology. Base cast iron showed two to three times higher wear rates than the alloyed gray irons. Tensile strength and wear rates show decreasing trend with increase in graphite and carbide volume fraction. Wear track analysis shows three body abrasive wear mode resulting in debris generation and smudging along the wear tracks. The graphite gets released during sliding to form films along the wear tracks and then forms irregular debris. 相似文献
8.
9.
Muthupandi Nagaraj Devanathan Perumal Muthusamy Boominathan Nattamai Bhuvanesh 《Journal of Sulfur Chemistry》2014,35(1):24-30
The attempted selenium dioxide oxidation of substituted diphenacyl sulfides in anticipation of further functionalization led to a series of α -ketoacids 3 via oxidation followed by C?S bond cleavage. Two minor products, 5 and 6, have also been isolated and a mechanistic pathway for the formation of 3, 5 and 6 has been proposed. 相似文献
10.
A series of novel aromatic diamines containing cycloaliphatic moieties was synthesized by the reaction of cycloalkanones like cyclohexanone and cycloheptanone with 2,6‐dimethylaniline. The tetrimide diacid was synthesized using the prepared diamine with 3,3′,4,4′‐benzophenonetetracarboxylic acid dianhydride/pyromellitic dianhydride and p‐aminobenzoic acid. The polymers were prepared by treating the tetrimide diacid with different aromatic diamines. The structures of the monomers and polymers were identified using elemental analysis and Fourier transform infrared, 1H NMR and 13C NMR spectroscopy. The polymers show excellent solubility. The polymers are amorphous and have high optical transparency. They also show good thermal stability and their Tg value is found to be in the range 268–305 °C. Copyright © 2007 Society of Chemical Industry 相似文献