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- 저자 : Riyas, (검색결과 25 건)
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Polymorphism in TiO2 under the influence of CuO and MnO2
Mohan Das, P.N,Riyas, S.,Krishnan, G. 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.4
Titanium dioxide shows polymorphism on heating to a higher temperature. This transformation is strongly dependent on temperature and time of heating. Pure Titania pulp containing amorphous titania was heated at different temperatures and for different times. Above 650oC the anatase phase evolved and between 900-1000 oC, an anatase-rutile transformation occurred. The anatase-rutile transformation in TiO2 in the presence of CuO and MnO2 was investigated. The different phases of TiO2 were determined using powder XRD. Other methods such as chemical analysis, scanning electron microscopy, surface area measurements and crystallite size calculations were used for the characterization of the samples. The transformation temperature was found to be much lowered in the presence of the above metal oxides. Also the method of preparation of metal oxide doped TiO2 affects the polymorphism. Titanium dioxide shows polymorphism on heating to a higher temperature. This transformation is strongly dependent on temperature and time of heating. Pure Titania pulp containing amorphous titania was heated at different temperatures and for different times. Above 650oC the anatase phase evolved and between 900-1000 oC, an anatase-rutile transformation occurred. The anatase-rutile transformation in TiO2 in the presence of CuO and MnO2 was investigated. The different phases of TiO2 were determined using powder XRD. Other methods such as chemical analysis, scanning electron microscopy, surface area measurements and crystallite size calculations were used for the characterization of the samples. The transformation temperature was found to be much lowered in the presence of the above metal oxides. Also the method of preparation of metal oxide doped TiO2 affects the polymorphism.
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Bachchan Abhitab,Hazra Puspendu,Sundaram Nimala,Kirtan Subhadip,Chaudhary Nakul,Riyas A.,Devan K. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
The early localization of a fuel subassembly with a failed (wet rupture) fuel pin is very important in reactors to limit the associated radiological and operational consequences. This requires a fast and reliable system for failure detection and their localization in the core. In the Prototype Fast Breeder Reactor, the system specially designed for this purpose is Failed Fuel Location Modules (FFLM) housed in the control plug region. It identifies a failed sub-assembly by detecting the presence of delayed neutrons in the sodium from a failed sub-assembly. During the commissioning phase of PFBR, it is mandatory to demonstrate the FFLM effectiveness. The paper highlights the engineering and physics design aspects of FFLM and the integrated simulation towards its function demonstration with a source assembly containing a perforated metallic fuel pin. This test pin mimics a MOX pin of 1 cm2 of geometrical defect area. At 10% power and 20% sodium flow rate, the counts rate in the BCCs of FFLM system range from 75 cps to 145 cps depending upon the position of DN source assembly. The model developed for the counts simulation is applicable to both metal and MOX pins with proper values of k-factor and escape coefficient.
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Riya Sailani,Meneka Bhasin,C.L. Khandelwal,P. D. Sharma 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
The kinetics and mechanism of oxidation of sulfanilic acid by N-chloro-p-toluene sulfonamide (chloramine-T) have been studied in acid medium. The species of chloramine-T were analysed on the basis of experimental observations and predominantly reactive species was taken into account for proposition of most plausible reaction mechanism. The derived rate law (1) conforms to such a mechanism. [수식] (1) All kinetic parameters were evaluated. Activation parameters such as energy and entropy of activation were calculated to be (61.67 ± 0.47) kJ mol-1 and (-62.71 ± 2.48) JK-1 mol-1 respectively employing Eyring equation.
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Use of Edit Distance Algorithm to Search a Keyword in Cloud Environment
Riya Mary,A.Sayali Nishikant,C. Jaya subalakshmi R,N. Ch. S. N. Iyengar 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
Cloud is a heterogeneous group of services and one of that is data storage. Generally the data stored in cloud is in very large amount, retrieval of the same requires precision and accuracy. Many methods are being proposed to retrieve data from cloud and strict match algorithm is one of them. In this paper we use of Levenshtein distance to find out the amount of similarity between two different strings. We compare the keyword given by user with our set of words, find out similarity and provide guesses to the user as accurate as possible.
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Riya Sidhikku Kandath Valappil,Nayef Ghasem,Mohamed Al-Marzouqi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Polymeric gas separation membranes have become a competent technology over the past few decades. This review focuses on the broad classifications of membrane materials and the criteria for the selectionof membrane materials, describes the various synthesis routes adopted for membrane fabrication, andexplains various gas transport mechanisms. A comparison of membrane-based separation technologywith other conventional technologies has also been made. The review also discusses the currentpolymers used for gas separations, current commercially viable membrane-based gas separationprocesses, and various limitations associated with the development of membrane material andseparation processes. Further, various new classes of membranes developed for gas separations,including thermally rearranged polymers, polymers of intrinsic microporosity, room temperature ionicliquids, perfluoro polymers, and mixed matrix membranes, that has high separation performance hasalso been discussed. Some of the emerging membrane-based gas separations are also reviewed.
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Riya Thomas,Uttkarsha Bhosale,Kriti Shukla,Anupama Kapadia 한국과학학술지편집인협의회 2023 Science Editing Vol.10 No.1
Purpose: This study was conducted to understand the perceptions and awareness of artificial intelligence (AI) in the academic publishing landscape. Methods: We conducted a global survey entitled “Role and impact of AI on the future of academic publishing” to understand the impact of the AI wave in the scholarly publishing domain. This English-language survey was open to all researchers, authors, editors, publishers, and other stakeholders in the scholarly community. Conducted between August and October 2021, the survey received responses from around 212 universities across 54 countries. Results: Out of 365 respondents, about 93% belonged to the age groups of 18–34 and 35–54 years. While 50% of the respondents selected plagiarism detection as the most widely known AI-based application, image recognition (42%), data analytics (40%), and language enhancement (39%) were some other known applications of AI. The respondents also expressed the opinion that the academic publishing landscape will significantly benefit from AI. However, the major challenges restraining the large-scale adoption of AI, as expressed by 93% of the respondents, were limited knowledge and expertise, as well as difficulties in integrating AI-based solutions into existing IT infrastructure. Conclusion: The survey responses reflected the necessity of AI in research and publishing. This study suggests possible ways to support a smooth transition. This can be best achieved by educating and creating awareness to ease possible fears and hesitation, and to actualize the promising benefits of AI.
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Effectiveness of renal denervation in the treatment of hypertension: a literature review
Riya Tejas Shah,Brian Xiangzhi Wang 대한고혈압학회 2022 Clinical Hypertension Vol.28 No.-
Catheter-based renal denervation has been studied as a potential therapeutic option to reduce high blood pressure (BP). Preclinical studies in some experimental models have demonstrated an antihypertensive effect of renal denervation but reports from clinical trials have been mixedWe performed a literature search using combinations of the key terms ‘Cardiovascular diseases, Clinical trial, Pre-clinical trials, Resistant hypertension, Renal denervation, Ablation technique, Radiofrequency ablation, Ultrasound ablation, RADIANCE SOLO, SYMPLICITY HTN, SYPRAL HTN’. The databases searched were PubMed and OVID Medline.The initial SYMPLICITY HTN-1 AND HTN-2 clinical trials reported significant decreases in office BP but results from the more robustly designed SYMPLICITY HTN-3 trial, which included sham controls and ambulatory BP monitoring, showed no significant antihypertensive effect. Interest in the use of renal denervation in hypertension was once again sparked by favourable results from the SPYRAL HTN-OFF Med trialWe provide a thorough, critical analysis of key preclinical and clinical studies investigating the efficacy of catheter-based renal denervation as a treatment for hypertension and highlight future areas for research to allow better translation into clinical practice
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Sailani, Riya,Bhasin, Meneka,Khandelwal, C.L.,Sharma, P.D. Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
The kinetics and mechanism of oxidation of sulfanilic acid by N-chloro-p-toluene sulfonamide (chloramine-T) have been studied in acid medium. The species of chloramine-T were analysed on the basis of experimental observations and predominantly reactive species was taken into account for proposition of most plausible reaction mechanism. The derived rate law (1) conforms to such a mechanism. $$-\frac{d[CAT]}{dt}=\frac{kK_1[RNHCl][SA]}{K_1+[H^+]}$$ (1) All kinetic parameters were evaluated. Activation parameters such as energy and entropy of activation were calculated to be $(61.67{\pm}0.47)kJmol^{-1}$ and $(-62.71{\pm}2.48)kJmol^{-1}$ respectively employing Eyring equation.
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Banerjee Riya,Chakladar Saswati,Mohanty Ashok,Chakravarty Sanchita,Chattopadhyay Shyamal Kumar,Jha M.K. 한국자원공학회 2022 Geosystem engineering Vol.25 No.3
Essential for smartphones, computers, batteries of hybrid and electric cars, medical scanners and weaponry, rare earth elements (REEs) play a pivotal role in every sphere of life globally. The race is on to develop alternative ways to utilize secondary sources, open new mines, reduce waste and recycle more. From being entirely dependent on China’s REE resources, the researchers and entrepreneurs globally are working towards development of alternative strategies to explore their indigenous resources to be self-sufficient. However, the existing strategies to extract these valuables rely on usage of mineral acids/alkalis. Continued effort on development of sustainable leaching methodologies led to the exploration of organic acids as a potential alternative. Lowmolecular- weight carboxylic acids and organosulphonic acids have emerged as highly potent class of lixiviants for REE extraction. The knowledge of their variation in chemical structure and their complex potency towards lanthanides is essential towards development of an industrially viable process. In this review, the efficiency of the different organic acids in leaching REEs from various primary and secondary sources, along with their respective structural relevance has been summarized. This is expected to ameliorate the existing momentum of advancing nature-friendly industrial processes.
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