NOPR Collection:

Isotherm and Thermodynamic Studies of the Biosorption of Humic Acid from Aqueous Solution by Pine Sawdust based Activated Charcoal

2021-03-01T00:00:00Z

Title: Isotherm and Thermodynamic Studies of the Biosorption of Humic Acid from Aqueous Solution by Pine Sawdust based Activated Charcoal Authors: Ibrahim, Sobhy M; Hassan, Mohamed R; Gad, H M H Abstract: Activated charcoal was prepared from pine tree sawdust by chemical activation by means of phosphoric acid (PSDP) that was used for Humic acid bio sorption from aqueous medium. The influence of humic acid initial concentration, sorbent mass, and solution temperature on sorption process was investigated. Langmuir and Freundlich isotherm models were used to analyze the equilibrium sorption data. The maximum adsorption capacities of PSDP obtained from Langmuir were 170.9, 182.1 and 209.6 mg/g at 25°C, 45°C and 65°C, respectively. Humic acid adsorption onto PSDP was spontaneous, favorable at higher temperature and endothermic in nature. Activated charcoal from pine tree sawdust proves to have high capacity adsorptive to natural organic compound (humic acid). Page(s): 203-209

Utilization of Iron Ore Tailings for Brick Manufacture from Donimalai Mines of Karnataka, India

2021-03-01T00:00:00Z

Title: Utilization of Iron Ore Tailings for Brick Manufacture from Donimalai Mines of Karnataka, India Authors: Singh, Ranjeet Kumar; Pal, Debjit; Signh, Shailendra Kr; Tripathi, Nimisha; Singh, Raj S Abstract: The iron tailings were mixed in various proportions with different combinations of cement, sand, and sodium silicate to obtain or value-added product out of iron tailing waste which is suitable for use in the construction industry. Bricks were made using a variety of compositions of iron tailings, Ordinary Portland Cement, sodium silicate, and sand in cuboid mould (9″X 5″X 3″). The bricks were dried for 24 hours, and then kilned at 115 ± 10°C for 24 hours. Mechanical features such as water absorption, compressive strength, and efflorescence are tested. The maximum compressive strength rating of 8.58 N/mm² was recorded with ratios of 8:2 (Iron tailing and cement). However, in process of making it economical, the ratio of 9:1 has opted and this ratio complies with the requirement of the Indian standard (IS: 1077:1992) of the common burnt clay building bricks. Water absorption for the proposed bricks is less than that of burnt clay bricks. The lower capillary pore can prevent the formation of efflorescence. This process, with the same parameters, can be exchanged commercially, and a large number of wastes of iron ore can be used to make bricks. Therefore, the technological processes identified in this paper can convert large amounts of hazardous waste into the environment into value-added products. Iron tailing can be seen as a stable addition to clay soils, its use when restricted to making bricks. This research helps to open a new area of research. Page(s): 210-220

MPP-MLO: Multilevel Parallel Partitioning for Efficiently Matching Large Ontologies

2021-03-01T00:00:00Z

Title: MPP-MLO: Multilevel Parallel Partitioning for Efficiently Matching Large Ontologies Authors: Yadav, Usha; Duhan, Neelam Abstract: The growing usage of Semantic Web has resulted in an increasing number, size and heterogeneity of ontologies on the web. Therefore, the necessity of ontology matching techniques, which could solve these issues, is highly required. Due to high computational requirements, scalability is always a major concern in ontology matching system. In this work, a partition-based ontology matching system is proposed, which deals with parallel partitioning of the ontologies at multilevel. At first level, the root based ontology partitioning is proposed. Match able sub-ontology pair is generated using an efficient linguistic matcher (IEI-Sub) to uncover anchors and then based on maximum similarity values, pairs are generated. However, a distributed and parallel approach of Map Reduce-based IEI-sub process has been proposed to efficiently handle the anchor discovery process which is highly time-consuming. In second level partitioning, an efficient approach is proposed to form non-overlapping clusters. Extensive experimental evaluation is done by comparing existing approaches with the proposed approach, and the results shows that MPP-MLO turns out to be an efficient and scalable ontology matching system with 58.7% reduction in overall execution time. Page(s): 221-229

ASIC Design of Radix-2,8-Point FFT Processor

2021-03-01T00:00:00Z

Title: ASIC Design of Radix-2,8-Point FFT Processor Authors: Kulkarni, Prasad; Hogade, B G; Kulkarni, Vidula; Turkar, Varsha Abstract: In split radix architecture, large sizes Fast Fourier Transforms (FFT) are decomposed into small independent computations to reduce storage burden. Radix-2, 8-point is one the popular choice in split radix for small independent computation. Authors proposes the FFT processor architecture for this small independent computation i.e. radix-2, 8-point FFT. This paper brief architecture comprising Butterfly Unit (BU), register set and controller. The novelty of this architecture is that it replaces the series of Processing Elements (PE) by single BU. BU computes two halves of the computations concurrently. Arithmetic computations are performed in floating point form to overcome the nonlinearities. All computations are controlled by tailored instruction set. All instructions are of same size and have same execution time. Twiddle constants are implicitly available in the instruction. Internal computations are stored in register set to avoid the load and store operations with memory. The mean square error of the computation is reduced by 41.95% and 55.76% in magnitude and phase respectively as compared with computations performed by rounding the twiddle constant. This FFT processor is synthesized, placed and routed for 45 nm technology of nangate open cell library. The BU of this architecture is 18.89% smaller and 5.13% faster as compared with smallest and fastest BU reported previously. The hardware cost metric i.e. D_p mm² ns²mW of proposed processor is 1.37. This cost metric is also 32.51% less as compared with the previous work. Page(s): 230-238