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RISS 인기검색어
- 검색키워드
- 저자 : Pradip Nath (검색결과 3 건)
- 무료
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Pradip Nath,Prabir Kumar Sarker 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.6
Sustainability of concrete can be improved by using large volume of fly ash as a replacement of cement and by ensuring enhanced durability of concrete. Durability of concrete containing large volume of class F fly ash is dependent on the design of mixture proportions. This paper presents an experimental study on the effect of mixture proportions on the drying shrinkage and permeation properties of high strength concrete containing large volume of local class F fly ash. Concrete mixtures were designed with and without adjustments in the water to binder ratio (w/b) and the total binder content to take into account the incorporation of fly ash up to 40% of total binder. Concretes, in which the mixture proportions were adjusted for fly ash inclusion achieved equivalent strength of the control concrete and showed enhanced properties of drying shrinkage, sorptivity, water permeability and chloride penetration as compared to the control concrete. The improvement of durability properties was less significant when no adjustments were made to the w/b ratio and total binder content. The results show the necessity of the adjustments in mixture proportions of concrete to achieve improved durability properties when using class F fly ash as a cement replacement.
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Mondal, Gopinath,Bera, Pradip,Santra, Ananyakumari,Jana, Sumanta,Mandal, Tarak Nath,Mondal, Anup,Seok, Sang Il,Bera, Pulakesh The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.10
<P>The reaction of CuCl<SUB>2</SUB>·2H<SUB>2</SUB>O with the methyl ester of 3,5-dimethyl pyrazole-1-dithioic acid (mdpa) yields a blackish brown complex of composition, [Cu(mdpa)<SUB>2</SUB>][CuCl<SUB>2</SUB>]. The complex formed a well-defined crystal and is characterized by single-crystal X-ray diffraction, thermogravimetry (TG), and spectroscopic studies. The molecule possesses a distorted tetrahedral configuration with a CuN<SUB>2</SUB>S<SUB>2</SUB> chromophore with +1 oxidation state of copper. The TG study reveals that the molecule is a suitable precursor for copper sulfide nanoparticles. The low temperature thermal decomposition of the single-source precursor produces hexagonal chalcocite (Cu<SUB>2</SUB>S) nanostructures in ethylene diamine and ethylene glycol. A selective synthesis of copper-rich high chalcocite was obtained using the new precursor. The size and morphology of the synthesized Cu<SUB>2</SUB>S nanoparticles are guided by the precursor and likely to be less dependent on the solvent used in the experiment. The nanoparticles were characterized by X-ray diffraction, scanning electronic microscope, and UV-Vis spectroscopic studies. The optical band gap of the as-synthesized Cu<SUB>2</SUB>S nanoparticles is measured to be 1.80–2.40 eV. The Cu<SUB>2</SUB>S nanoparticles are found to be good catalysts in UV photo catalytic decomposition (90%) of Congo red (CR) dye following first-order reaction kinetics, and the reusability study of the Cu<SUB>2</SUB>S catalyst also shows excellent catalytic performance (80%).</P> <P>Graphic Abstract</P><P>A new single-source precursor, [Cu(mdpa)<SUB>2</SUB>][CuCl<SUB>2</SUB>], is used to prepare selectively high chalcocite (Cu<SUB>2</SUB>S) with excellent photodegradation of Congo red (CR). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00584h'> </P>
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Dhar, Sujit,Dutta, Biswajit,Ghoshroy, Debasmita,Roy, Debabrata,Sadhu, Pradip Kumar,Ganguly, Ankur,Sanyal, Amar Nath,Das, Soumya Techno-Press 2017 Advances in computational design Vol.2 No.4
High frequency full bridge series resonant inverters have become increasingly popular among power supply designers. One of the most important parameter for a High Frequency Full Bridge Series Resonant Inverter is optimal coil design. The optimal coil designing procedure is not a easy task. This paper deals with the New Approach to Optimal Design Procedure for a Real-time High Frequency Full Bridge Series Resonant Inverter in Induction Heating Equipment devices. A new design to experimental modelling of the physical properties and a practical power input simulation process for the non-sinusoidal input waveform is accepted. The design sensitivity analysis with Levenberg-Marquardt technique is used for the optimal design process. The proposed technique is applied to an Induction Heating Equipment devices model and the result is verified by real-time experiment. The main advantages of this design technique is to achieve more accurate temperature control with a huge amount of power saving.
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