36 research outputs found
One pot molten salt synthesis and photocatalytic studies of magnetically separable copper ferrite microcrystals
No full textThe preparation of tetragonal and cubic structured CuFe2O4 microcrystals by the one-pot molten salt synthesis in a eutectic mixture of NaCl - KCl molten salts at 800–900 °C is reported. Phase evolution and single-phase formation of CuFe2O4 on temperature and soaking period effect were studied. The structure and morphology of the synthesized compounds were investigated using techniques such as powder X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. Microscopy studies revealed microcrystals of CuFe2O4 in an octahedron morphology. Photoluminescence and X-ray photoelectron spectroscopy analysis revealed the existence of surface oxygen defects on both prepared compounds. The photocatalytic studies of tetragonal and cubic structured CuFe2O4 catalysts shown 89% and 93% degradation of the Rhodamine-B (RhB) dye, respectively, under UV-A (366 nm) irradiation in 90 min. Photocatalytic and magnetic studies indicate that these CuFe2O4 samples are suitable magnetic separable photocatalysts for efficient dye degradation, and can be reasonably reused.Fil: Koppala, Sivasankar. Kunming University Of Science And Technology; ChinaFil: Balan, Ramdas. Cmr Institute Of Technology; IndiaFil: Litter, Marta Irene. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigación e Ingeniería Ambiental; ArgentinaFil: Xu, Lei. Kunming University Of Science And Technology; ChinaFil: Li, Kangqiang. Beihang University; ChinaFil: Liu, Hua. Ecole Centrale de Lille Cit´e Scientifique; FranciaFil: Lekshmi, I.C.. Cmr Institute Of Technology; IndiaFil: Begam Mohamed, Rigana. No especifíca
Modulation, photoluminescence, and Raman spectroscopy of semiconductor heterostructures
No full textUsing illustrative examples from the investigations of the author and his collaborators, it is shown that (1) piezo-modulated reflectivity (2) photoluminescence and (3) Raman spectroscopy can be effectively used in the study of collective and localized excitations in semiconductor heterostructures. Results on epilayers of Cd1-xMnxTe:In and ZnSe and quantum well structures of GaAs/AlxGa1-xAs; Cd1-xMnxTe/Cd1-yMnyTe; Cd1-xMnxTe/CdTe; Cd1-xMnxTe:In/CdTe are discussed
Perceptions and treatment of cutaneous leishmaniasis in Suriname: a medical-anthropological perspective
Get PDFCutaneous leishmaniasis is a parasitic skin infection, viewed by biomedical professionals as one of the most serious skin diseases in developing countries. It affects between 1 and 1.5 million people globally and is a growing health problem. The disease is caused by parasites that are transmitted via the bite of an infected sand fly. How do people in Suriname, where CL is common in the hinterland, perceive, explain and fight the disease? This study describes and analyses the complex health seeking trajectory of CL patients in Suriname from a medical-anthropological perspective. Using mainly qualitative methods, the author explores people’s illness experiences and treatment decisions (self-medication, herbal traditional medicine, biomedical treatment). She argues that these should be understood from the view point of patients and their direct environment, within the larger historical, social, economic, and environmental contexts. She relates the stunning variety of medicines people use in self-medication with their uncertainty about the cause of the illness, their associative style of reasoning, and the specific context of their daily life. One of the most prominent and disfiguring characteristics of the disease is its extensive ulceration and scar formation from lesions. Cutaneous leishmaniasis is therefore often associated with stigma.The most striking conclusion of the study is that - unlike in some other countries - people with CL are, in general, not stigmatized in Suriname and do not feel inhibited to seek biomedical treatment because of shame
Design of an experiment to investigate superheat effect on gate velocities
No full textThe objective of this thesis investigation was to design an experiment to investigate superheat effect on gate velocities pressurized and unpressurized gating system each having two gates, and to analyze statistically any interrelationship between these variables in CO₂ molds.
A discussion on metal flow through different parts of a gating system, with a minimum of turbulence and gas aspiration, and a discussion of hydrodynamic principles relating to gating systems were given. The realization of these conditions is desirable because it results in improved casting, fewer rejects, and greater economy in a casting production. This was followed by a discussion on metal flow variables. Principle and use of instrumentation used in the experiment was discussed. Split-split-plot type of statistical design was used. Statistical analysis of results were made.
The author concluded that, the type of gating system (pressurized or unpressurized) and individual gate location have significant effect, whereas superheat (100-300°F.) has no significant effect on gate velocities of aluminum - 12 percent silicon in CO₂ molds. Also, all the there variables are independent of each other.Master of Scienc
Bioavailability of metolachlor and glyphosate in aerobic and anaerobic soils
Get PDFMetolachlor and glyphosate are two extensively used herbicides in the USA and throughout the globe. Despite the prevalence of anaerobic wet situations in the soil, the predictive capability for the environmental fate and bioavailability of these herbicides is based primarily on well-drained soil conditions. Anoxic events and flooding ubiquitous to agroecosystems may pose a threat for persistence and transport or conversely may facilitate herbicide degradation. This study was undertaken to explore the knowledge gap in the microbial bioavailability and degradation of metolachlor and glyphosate in aerobic and anaerobic soil conditions.
Metolachlor retention pattern in the soils were significantly influenced by anaerobic conditions. Anaerobic soil incubations induced better degradation and mineralization of metolachlor in the range of soils evaluated, despite the differences in soil properties. The findings also confirmed the activity of microorganisms in the degradation and mineralization of metolachlor in the soils in spite differences in their soil properties and redox conditions. The anaerobic degradation and mineralization of metolachlor coincided with the iron (Fe) reducing conditions in soil namely Fe2+ formation and suggested a probable role of Fe in the microbial fate of metolachlor under such soil environmental conditions. Stable isotope probing (SIP) facilitated the identification of microorganisms responsible for the mineralization of metolachlor in aerobic and anaerobic soils. The 16S rRNA gene sequences of clones implied the role of organisms closely related to Bacillus spp. in aerobic and Acidobacteria in anaerobic mineralization of metolachlor in soils.
Glyphosate also was influenced by soil redox conditions for bioavailability and mobility in soils. Contrary to metolachlor, the degradation and mineralization of glyphosate exhibited a slower kinetics in anaerobic soils compared to corresponding aerobic soils in all the soil types investigated. Glyphosate degradation was also deduced as a purely microbiological process as almost no degradation or mineralization occurred in sterile control soils. The addition of phosphate suppressed the adsorption of glyphosate in both aerobic and anaerobic soils and confirmed the widespread competition between glyphosate and phosphate for adsorption sites in soils.
In summary, the results from this dissertation research clearly highlight the significance of aerobic versus anaerobic soil conditions as an important factor affecting the bioavailability of metolachlor and glyphosate in soils. The information generated from the current study could be applied towards efficacious use of metolachlor and glyphosate in soils and also for framing a viable strategy for the efficient clean-up of soils contaminated by these herbicides.Item withdrawn by Mark Zulauf ([email protected]) on 2014-04-21T20:18:23Z
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On the optimality of coin-betting for mean estimation
No full textWe consider the problem of testing the mean of a bounded real random variable. We introduce a notion of optimal classes for e-variables and e-processes, and establish the optimality of the coin-betting formulation among e-variable-based algorithmic frameworks for testing and estimating the (conditional) mean. As a consequence, we provide a direct and explicit characterisation of all valid e-variables and e-processes for this testing problem. In the language of classical statistical decision theory, we fully describe the set of all admissible e-variables and e-processes, and identify the corresponding minimal complete class.The author would like to thank Gergely Neu, Peter D. Grünwald, Nishant A. Mehta, Hamish E. Flynn, and Claudia M. Chanu, for the insightful discussions that inspired this work. I would also like to thank Nick W. Koning and Aditya Ramdas for their constructive feedback, which helped improve this work following its initial appearance, and Wouter M. Koolen for helpful discussions on e-processes. Finally, I thank the anonymous reviewers for the insightful comments and feedback that helped improving this work. GPT-4o was used during the redaction of this paper to polish the presentation. All AI-generated text was reviewed and edited by the author, who takes full responsibility for the content of this manuscript. This project was funded by the European Research Council (ERC), under the European Union's Horizon 2020 research and innovation programme (grant agreement 950180)
Molten Salt Synthesis of Nanocrystalline ZnFe 2 O 4 and Its Photocatalytic Dye Degradation Studies
No full textRecurrence of membranous nephropathy three weeks' postrenal transplant: A surprise in store
No full textMembranous nephropathy (MN) may occur in the transplanted kidney, either as recurrent disease in patients who had MN as the cause of end-stage renal disease (ESRD) in the native kidney or de novo, in patients who had another cause of ESRD initially. The reported incidence of recurrent MN ranges between 10% and 45%. Clinical manifestations of recurrent MN are typically observed 13-15 months after transplantation, although they may be observed much earlier (within weeks). Our patient had a recurrence in three weeks. Recurrent disease can lead to loss of the allograft
Web-Based Bibliographic Services Offered by Top World and Indian University Libraries
No full textBibliographical services are services related to the library collection and access to those collections, whether print or online. In modern libraries, these services are provided online through website. Many studies have been carried out to study application of web 2.0 tools and web-based services offered by the libraries. There is need to study the basic fundamental library services offered via the web or websites in modern libraries. In this paper author studied tops world and Indian libraries and prepared inventory of web-based bibliographic services offered by these libraries and analyzed the data in a quantitative way.</p
