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Suresh Rai,Ulugbek Shaislamov,Jong Keun Yang,Shirjana Saud,Waqar Ahmed Muhammed,이헌주 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.8
Metallic mirrors are now essential components of the (International Thermonuclear Experiment Reactor) ITER plasma diagnostics system. The optical properties of the first mirror (FM) in the hostile ITER environment have adverse effects due to erosion and deposition owing to high energy charge exchange of neutral (CXN) particles, UV, X-ray, and gamma radiation. Molybdenum (Mo) and rhodium (Rh) are attractive metals for the FM(s) as they can withstand the harsh conditions of the plasma environment and have better reflectivity. However, the high cost of Rh limits its use as a single material in the FM; as a result, it is deposited as a thin film over a metallic substrate. Moreover, due to the different thermal expansion of the coated materials on FM leads to weak adhesion of the thin layers thereby reducing the life of the coated mirror; this eventually leads to the deterioration of the optical properties of the diagnostic mirror. Furthermore, this phenomenon is becoming a problem concerning the stainability and reflectivity of the diagnostic mirror. This study aims to show the performance of niobium (Nb) as an interlayer between Mo and an Rh thin films deposited via DC magnetron sputtering at the deposition power of 40 W. The Mo mirrors were exposed to the high temperature and were left to cool naturally to room temperature. Rougher surfaces, larger grain sizes, and excellent adhesion were observed. The overall reflectance of the mirrors exposed to high temperature was reduced by 10–15%.
Rai, Bhavana,Dhanireddy, Bhaswanth,Patel, Firuza Darius,Kumari, Reena,Oinam, Arun Singh,Simha, Vijai,Sharma, Suresh Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8
Background: The aim of the study was to evaluate the vaginal dose and toxicity in patients of cervical cancer treated with image guided brachytherapy at our institute. Materials and Methods: Thirty-five patients treated with image based brachytherapy for cervical cancer were included. Vaginal contouring was done on MRI at brachytherapy and with CT scans of subsequent brachytherapy fractions. Dose volume parameters (DVH) were reported in accordance with the GEC-ESTRO guidelines. These were correlated with vaginal toxicity (assessed by CTCAE version 3) and quality of sexual life assessed at one year of completion of treatment. Results: Vaginal shortness was observed in 22 out of 30 (62.8%) patients, Nine (25.7%) had vaginal dryness and in 10 (28.5%) patients, there was contact bleeding. No association could be demonstrated between the dose volume parameters and vaginal toxicity in the present study. Conclusions: The lack of association between dose volume parameters of vagina with vaginal morbidity may be due to uncertainties involved in the delineation of vaginal wall and dosimetry. Future research is required to accurately define vaginal dose distribution to study its correlation with vaginal morbidity. Vaginal morbidity needs to be documented in order to improve the sexual outcome in these patients.
A critical review of ferrate(VI)-based remediation of soil and groundwater
Rai, Prabhat Kumar,Lee, Jechan,Kailasa, Suresh Kumar,Kwon, Eilhann E.,Tsang, Yiu Fai,Ok, Yong Sik,Kim, Ki-Hyun Elsevier 2018 Environmental research Vol.160 No.-
<P><B>Abstract</B></P> <P>Over the past few decades, diverse chemicals and materials such as mono- and bimetallic nanoparticles, metal oxides, and zeolites have been used for soil and groundwater remediation. Ferrate (Fe<SUP>VI</SUP>O<SUB>4</SUB> <SUP>2-</SUP>) has been widely employed due to its high-valent iron (VI) oxo compound with high oxidation/reduction potentials. Ferrate has received attention for wide environmental applications including water purification and sewage sludge treatment. Ferrate provides great potential for diverse environmental applications without any environmental problems. Therefore, this paper provides comprehensive information on the recent progress on the use of (Fe<SUP>VI</SUP>O<SUB>4</SUB> <SUP>2-</SUP>) as a green material for use in sustainable treatment processes, especially for soil and water remediation. We reviewed diverse synthesis recipes for ferrates (Fe<SUP>VI</SUP>O<SUB>4</SUB> <SUP>2-</SUP>) and their associated physicochemical properties as oxidants, coagulants, and disinfectants for the elimination of a diverse range of chemical and biological species from water/wastewater samples. A summary of the eco-sustainable performance of ferrate(VI) in water remediation is also provided and the future of ferrate(VI) is discussed in this review.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ferrate(VI) has exhibited promising behavior towards the oxidation of inorganic/organic impurities. </LI> <LI> It has unique properties of strong oxidizing potential and generation of ferric coagulating species. </LI> <LI> It can degrade and/or oxidize organic and inorganic impurities (at least partially). </LI> <LI> It can also disinfect microorganisms and remove suspended/colloidal particulate materials. </LI> <LI> We reviewed on the preparation, properties, and role of ferrate to resolve multifaceted challenges. </LI> </UL> </P>
Radiotherapy for Ovarian Cancers - Redefining the Role
Rai, Bhavana,Bansal, Anshuma,Patel, Firuza Darius,Sharma, Suresh Chander Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.12
Radiation therapy in ovarian cancers has been considered an outdated concept for many years, mainly due to its toxicity and failure to show benefit in terms of survival. Chemotherapy has been extensively used after surgery for these cancers and it has almost replaced radiation therapy as an adjuvant treatment. Nevertheless, failures in ovarian cancers continue to occur even with the use of newer and effective chemotherapy regimens. About 70% patients demonstrate recurrence in the abdomen or pelvis after first line chemotherapy in ovarian cancers. With advances in technology and sophistication of radiation techniques, along with the molecular and biological knowledge of distinct histological subtypes, there is a need to redefine the role of radiation therapy. This review article focuses on the literature on use of radiation in ovarian cancers and its rationale and indications in the present day. For this, a literature pub med/medline search was performed from January 1975 to March 2014 to redefine the role of radiotherapy in ovarian cancers.