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Search Results: 1 - 10 of 367 matches for " Preeti Ovartchaiyapong "
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Dynamic strain-mediated coupling of a single diamond spin to a mechanical resonator
Preeti Ovartchaiyapong,Kenneth W. Lee,Bryan A. Myers,Ania C. Bleszynski Jayich
Physics , 2014, DOI: 10.1038/ncomms5429
Abstract: The development of hybrid quantum systems is central to the advancement of emerging quantum technologies, including quantum information science and quantum-assisted sensing. The recent demonstration of high quality single-crystal diamond resonators has led to significant interest in a hybrid system consisting of nitrogen-vacancy center spins that interact with the resonant phonon modes of a macroscopic mechanical resonator through crystal strain. However, the nitrogen-vacancy spin-strain interaction has not been well characterized. Here, we demonstrate dynamic, strain-mediated coupling of the mechanical motion of a diamond cantilever to the spin of an embedded nitrogen-vacancy center. Via quantum control of the spin, we quantitatively characterize the axial and transverse strain sensitivities of the nitrogen-vacancy ground state spin. The nitrogen-vacancy center is an atomic scale sensor and we demonstrate spin-based strain imaging with a strain sensitivity of 3 10^(-6) strain Hz^(-1/2). Finally, we show how this spin-resonator system could enable coherent spin-phonon interactions in the quantum regime.
Scanned probe imaging of nanoscale magnetism at cryogenic temperatures with a single-spin quantum sensor
Matthew Pelliccione,Alec Jenkins,Preeti Ovartchaiyapong,Christopher Reetz,Eve Emmanuelidu,Ni Ni,Ania C. Bleszynski Jayich
Physics , 2015,
Abstract: High spatial resolution magnetic imaging has driven important developments in fields ranging from materials science to biology. However, to uncover finer details approaching the nanoscale with greater sensitivity requires the development of a radically new sensor technology. The nitrogen-vacancy (NV) defect in diamond has emerged as a promising candidate for such a sensor based on its atomic size and quantum-limited sensing capabilities afforded by long spin coherence times. Although the NV center has been successfully implemented as a nanoscale scanning magnetic probe at room temperature, it has remained an outstanding challenge to extend this capability to cryogenic temperatures, where many solid-state systems exhibit non-trivial magnetic order. Here we present NV magnetic imaging down to 6 K with 6 nm spatial resolution and 3 {\mu}T/$\sqrt{\mbox{Hz}}$ field sensitivity, first benchmarking the technique with a magnetic hard disk sample, then utilizing the technique to image vortices in the iron pnictide superconductor BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$ with $T_c$ = 30 K. The expansion of NV-based magnetic imaging to cryogenic temperatures represents an important advance in state-of-the-art magnetometry, which will enable future studies of heretofore inaccessible nanoscale magnetism in condensed matter systems.
Tessier 30 Facial Cleft Associated with Complete Duplication of Tongue: A Rare Entity  [PDF]
Jayanto Tapadar, Preeti Tiwari
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2015, DOI: 10.4236/ijohns.2015.42029
Abstract: Background: Median cleft of mandible and lower lip is a rare anomaly [1]. Only a few cases have been reported in literature with different variations till now. Herein we report a patient with Tessier 30 cleft associated with complete duplication of tongue. Aim: We herein report this rare variant as it posed special challenges for its management by virtue of its uniqueness, late presentation and limited affordability of patient for standard treatment. Case Report: A 12 years old female reported to us with a chief complaint of a midline gap in the lower lip and mandible since birth. On examination under anaesthesia, we found that tongue was not bifid. There was complete duplication of the tongue. The case was planned for staged repair of the defect. In the same sitting, a repair of the soft tissues in the midline was performed. Conclusion: There are no specific guidelines in literature for management of such cases. This makes all these cases worth for reporting in order to guide treating surgeons.
Coupled Fixed Point for (α, Ψ)-Contractive in Partially Ordered Metric Spaces Using Compatible Mappings  [PDF]
  Preeti, Sanjay Kumar
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.68130
Abstract: In this paper, first we introduce notions of (α, Ψ)-contractive and (α)-admissible for a pair of map and prove a coupled coincidence point theorem for compatible mappings using these notions. Our work extends and generalizes the results of Mursaleen et al. [1]. At the end, we will provide an example in support of our result.
Study of Heavy Metal Accumulation in Sewage Irrigated Vegetables in Different Regions of Agra District, India  [PDF]
Preeti Parashar, Fazal Masih Prasad
Open Journal of Soil Science (OJSS) , 2013, DOI: 10.4236/ojss.2013.31001

Heavy metal contamination of soil resulting from sewage irrigation is a cause of serious concern due to the potential health impacts of consuming contaminated products. In this study an assessment made of the impact of sewage irrigation on heavy metal contamination of Spinach, Cabbage, Beetroot, Reddish, Okra, Tomato, and Cucumber is widely cultivated and consumed in urban India, particularly by the poor. A field study was conducted at seven major sites that were irrigated by either treated, (Dhandupura) or untreated wastewater in the suburban areas of Agra, India. Samples of irrigation water, soil, and the edible portion of all the vegetables were collected monthly during the winter seasons and were analyzed for Fe, Cd, Cu, Zn, and Pb. Heavy metals in irrigation water were below the internationally recom- mended (WHO) maximum permissible limits set for agricultural use for all heavy metals except Cd at all the sites. Similarly, the mean heavy metal concentrations in soil were below the Indian standards for all heavy metals, but the maximum value of Cd recorded during January was higher than the standard. However, in the edible portion of spinach, the Cd concentration was higher than the permissible limits of the Indian standard during summer, whereas Pb concentrations were higher in winter seasons. Results of correlation analysis were computed to assess the relationship between individual heavy metal concentration in the vegetable samples. The study concludes that the use of treated and untreated wastewater for irrigation has increased the contamination of Cd, Pb in edible portion of vegetables causing potential health risk in the long term from this practice. The study also points to the fact that adherence to standards for heavy metal contamination of soil and irrigation water does not ensure safe food. Fe was measured abundant in soil whereas Pb and Cd were found more in untreated sites as compared to treated site. Correlation, paired T-test and ANOVA were also carried out for pre post harvested soil and vegetables.

Molecular Significance of lon and cpxR Genes in the Pathogenicity of Salmonella  [PDF]
Rahul M. Nandre, Preeti Mahajan
Open Journal of Animal Sciences (OJAS) , 2015, DOI: 10.4236/ojas.2015.54045
Abstract: The important foodborne zoonotic pathogen Salmonella causes gastroenteritis. The dynamics of host-pathogen Salmonella interaction and infection might enhance the development of novel tar-geted preventative measures and drug regimens. The lon and cpxR are virulence associated genes, which have an important role in the Salmonella pathogenesis. However, the deletions of lon and cpxRlead to the construction of genetically engineered live Salmonella vaccine candidate. In this review, lon and cpxR genes are focused for their involvement in Salmonella pathogenesis. Furthermore, the importance of these genes was briefly emphasized during the construction of Salmonella vaccine candidate.
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Understanding the grey marketing…….Gray markets occur when a product is designed and destined for a particular market, and an intermediary known as a 'gray marketer' brings that product to a second market to sell it for less than its list price in that second market. (David Soberman, 2012)The grey market has been escalating rapidly, leading to a number of problems including loss of revenue and margin, damage to the carrier affiliation, depreciation of the brand, possible liability and safety concerns, misalignment of budgets, and reduced inventory turnover. Grey market products are generally sold at lower prices than those offered by authorized distribution partners.
Tinospora cordifolia (Amrita)-A miracle herb and lifeline to many diseases
International Journal of Medicinal and Aromatic Plants , 2011,
Abstract: Medicinal plants have been used to cure human illness since time immemorial. Some of these drugs are believed to promote positive health and maintain organic resistance against infections by re-establishing body’s immune system and thus help in maintaining body equilibrium and conditioning of body tissues. Immuno-modulating and immune-potentiating agents have been reported to act primarily on cellular rather than humoral immune responses and to restore the aired host tissues without hyperstimulating the normals. It augments macrophage chemotaxis, phagocytosis and promotes interaction with other immunoregulatory lymphoid cells. Tinospora cordifolia (family Menispermaceae) is a large glabrous, deciduous climbing shrub typically growing in deciduous and dry forests. It is distributed throughout tropical Indian subcontinent ascending from Himalayas down to the southern part of Peninsular India at an altitude of 300 m asl. It is also reported in neighboring countries like Bangladesh, Pakistan and Sri Lanka. It is rightly called the magical herb due to its property of curing a lot of diseases. The present investigation provides evidences that support the ethnomedicinal properties of Tinospora cordifolia in the light of various researches.
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Honour killing is the oppression and murder carried out in the name of culture, tradition, or religion, and the consequential confusion many Indians experience in the name of social familial honour. 'Honour killing' also known as 'customary killing' is the murder of a family or clan member by one or more family members where the murderers, essentially the community at wider scope thinks that the victim through his/her actions has brought disgrace to the family honour. This concept of honour is so deeply rooted in the traditional society that it acquires importance larger than the life of the family member itself. It is a crime which originates from the culture or race or one might even call it a cultural tradition.1 Indeed, recent research has made it amply clear that crimes committed to uphold honour are fairly widely spread not only across India but also in the entire Asian subcontinent. The phenomenon is unbelievable that in the 21st century, where India takes pride over its largest democracy, families murder their kith and kin for allegedly saving their honor. This paper is an attempt to highlight: 1)The concept of honour killing; 2) honour killing in India, how it took its shape, and why its so hard to tackle with it 3)the present legal system that stands to swipe this menace, and the views of Honorable courts on the subject.
Savardekar Preeti
Indian Journal of Dermatology, Venereology and Leprology , 2007,
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