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  • 1
    Online Resource
    Online Resource
    Some remarks on certain classes of semilattices
    Hindawi Limited ; 1982
    In:  International Journal of Mathematics and Mathematical Sciences Vol. 5, No. 1 ( 1982), p. 21-30
    Details
    In: International Journal of Mathematics and Mathematical Sciences, Hindawi Limited, Vol. 5, No. 1 ( 1982), p. 21-30
    Abstract: In this paper the concept of a ∗ -semilattice is introduced as a generalization to distributive ∗ -lattice first introduced by Speed [1]. It is shown that almost all the results of Speed can be extended to a more eneral class of distributive ∗ -semilattices. In pseudocomplemented semilattices and distributive semilattices the set of annihilators of an element is an ideal in the sense of Grätzer [2]. But it is not so in general and thus we are led to the definition of a weakly distributive semilattice. In § 2 we actually obtain the interesting corollary that a modular ∗ -semilattice is weakly distributive if and only if its dense filter is neutral. In § 3 the concept of a sectionally pseudocomplemented semilattice is introduced in a natural way. It is proved that given a sectionally pseudocomplemented semilattice there is a smallest quotient of it which is a sectionally Boolean algebra. Further as a corollary to one of the theorems it is obtained that a sectionally pseudocomplemented semilattice with a dense element becomes a ∗ -semilattice. Finally a necessary and sufficient condition for a ∗ -semilattice to be a pseudocomplemented semilattice is obtained.
    Type of Medium: Online Resource
    ISSN: 0161-1712 , 1687-0425
    URL: Article
    DOI: 10.1155/S0161171282000039
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 1982
    detail.hit.zdb_id: 1492203-4
    SSG: 17,1
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  • 2
    Online Resource
    Online Resource
    Experimental and Thermal Investigation on Powder Mixed EDM Using FEM and Artificial Neural Networks
    Hindawi Limited ; 2021
    In:  Advances in Materials Science and Engineering Vol. 2021 ( 2021-9-6), p. 1-12
    Details
    In: Advances in Materials Science and Engineering, Hindawi Limited, Vol. 2021 ( 2021-9-6), p. 1-12
    Abstract: Electric discharge machining (EDM) process is one of the earliest and most extensively used unconventional machining processes. It is a noncontact machining process that uses a series of electric discharges to remove material from an electrically conductive workpiece. This article is aimed to do a comprehensive experimental and thermal investigation of the EDM, which can predict the machining characteristic and then optimize the output parameters with a newly integrated neural network-based methodology for modelling and optimal selection of process variables involved in powder mixed EDM (PMEDM) process. To compare and investigate the effects caused by powder of differently thermo physical properties on the EDM process performance with each other as well as the pure case, a series of experiments were conducted on a specially designed experimental setup developed in the laboratory. Peak current, pulse period, and source voltage are selected as the independent input parameters to evaluate the process performance in terms of material removal rate (MRR) and surface roughness (Ra). In addition, finite element method (FEM) is utilized for thermal analysis on EDM of stainless-steel 630 (SS630) grade. Further, back propagated neural network (BPNN) with feed forward architecture with analysis of variance (ANOVA) is used to find the best fit and approximate solutions to optimization and search problems. Finally, confirmation test results of experimental MRR are compared using the values of MRR obtained using FEM and ANN. Similarly, the test results of experimental Ra also compared with obtained Ra using ANN.
    Type of Medium: Online Resource
    ISSN: 1687-8442 , 1687-8434
    URL: Article
    DOI: 10.1155/2021/8138294
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2501025-6
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  • 3
    Online Resource
    Online Resource
    Bi-objective Optimization of Process Parameters in Electric Discharge Machining of SS630 Using Grey Relation Analysis
    Hindawi Limited ; 2022
    In:  Journal of Nanomaterials Vol. 2022 ( 2022-6-23), p. 1-11
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2022 ( 2022-6-23), p. 1-11
    Abstract: One of the most former and widely utilized unconventional machining is known as the process of electric discharge machining (EDM). This is a procedure, where a serialized set of electric discharges are applied to eliminate the material from a workpiece (i.e., electrically conductive). This article proposes a bi-objective optimization of process arguments in machining of stainless steel of 630 (SS630) grade using both experimentation and thermal investigation. Here, flushing pressure ( P F ), pulse on-time ( T ON ), peak current ( I p ), and pulse off-time ( T OFF ) are assumed as the input process parameters to conduct a series of experiments on die-sinking EDM (DS-EDM) of SS630 to predict the output characteristics of machining optimization using grey relation analysis (GRA). Both material removal rate (MRR) and surface roughness (SR) are used for evaluating the output response obtained using the machining performance. In addition, thermal investigation is performed using finite element method (FEM) analysis to compute theoretical MRR (T-MRR) for the distribution of temperature on workpiece. Further, GRA is employed to obtain the optimal process parameter combination for best output responses. From the confirmation test results, the optimal combination obtained using GRA approach is at I p = 6 A , T ON = 35   μ s , T OFF = 90   μ s , and P F = 4   MPa .
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    URL: Article
    DOI: 10.1155/2022/1165750
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2229480-6
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  • 4
    Online Resource
    Online Resource
    Effect of Dwell Time on Fracture Load of Friction Stir Spot Welded Dissimilar Metal Joints
    Hindawi Limited ; 2022
    In:  Advances in Materials Science and Engineering Vol. 2022 ( 2022-8-21), p. 1-7
    Details
    In: Advances in Materials Science and Engineering, Hindawi Limited, Vol. 2022 ( 2022-8-21), p. 1-7
    Abstract: The dissimilar materials joining in heavy structural fabrication industries is tedious work for welding and design engineers, since the weld region’s criticality is encountered by hot cracking and its associated problems. Moreover, dissimilar materials are joined by mechanical locking such as rivets, bolt and nuts, and screws. Nowadays, the fasteners are eliminated by friction stir welding (FSW). The friction stir spot welding (FSSW) is a variant of FSW; it can be avoided by seam welding. Hence, in this investigation, FSSW is used for joining AA6061 aluminum alloy with mild steel using tool rotation speed, plunge depth and rate, and shoulder to pin diameter ratio. The experimental method observed that the joint fabricated with a rotational speed of 1000 rpm, plunge rate of 5 mm/min, plunge depth of 6 mm/min, and shoulder diameter to pin diameter ration of 3.0 yielded highest fracture load The optimum heat input could obtain the improvement in FSSW joint strength. Recrystallized grains and favorable intermetallic compound formation are the primary factors for sound welding.
    Type of Medium: Online Resource
    ISSN: 1687-8442 , 1687-8434
    URL: Article
    DOI: 10.1155/2022/2163507
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2501025-6
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  • 5
    Online Resource
    Online Resource
    Solar device for the candle industry
    Hindawi Limited ; 1982
    In:  International Journal of Energy Research Vol. 6, No. 3 ( 1982), p. 297-302
    Details
    In: International Journal of Energy Research, Hindawi Limited, Vol. 6, No. 3 ( 1982), p. 297-302
    Type of Medium: Online Resource
    ISSN: 0363-907X , 1099-114X
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.1002/er.v6:3
    DOI: 10.1002/(ISSN)1099-114X
    DOI: 10.1002/er.4440060311
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 1982
    detail.hit.zdb_id: 1480879-1
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  • 6
    Online Resource
    Online Resource
    Design, development and testing of an improved multipurpose solar energy device
    Hindawi Limited ; 1986
    In:  International Journal of Energy Research Vol. 10, No. 1 ( 1986-01), p. 91-96
    Details
    In: International Journal of Energy Research, Hindawi Limited, Vol. 10, No. 1 ( 1986-01), p. 91-96
    Type of Medium: Online Resource
    ISSN: 0363-907X , 1099-114X
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.1002/er.v10:1
    DOI: 10.1002/(ISSN)1099-114X
    DOI: 10.1002/er.4440100111
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 1986
    detail.hit.zdb_id: 1480879-1
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  • 7
    Online Resource
    Online Resource
    Electrochemical Behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones
    Hindawi Limited ; 2012
    In:  E-Journal of Chemistry Vol. 9, No. 4 ( 2012), p. 1864-1874
    Details
    In: E-Journal of Chemistry, Hindawi Limited, Vol. 9, No. 4 ( 2012), p. 1864-1874
    Abstract: The electrochemical behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones has been investigated at dme and gc electrodes in buffer solutions of pH 2.0, 4.0, 6.0, 8.0 and 10.0 using dc polarography and cyclic voltammetry and coulometry. The compounds exhibit one well defined wave in the entire pH range of study. The process is irreversible and diffusion controlled. Controlled potential electrolysis indicates the involvement of four electrons in the reduction process. The effect of solvent, cations and anions, temperature and substitutents on the mechanism of reduction has been studied. Based on the results obtained the mechanism of reduction has been suggested.
    Type of Medium: Online Resource
    ISSN: 0973-4945 , 2090-9810
    URL: Article
    DOI: 10.1155/2012/598905
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2012
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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