Author
Elena Velichko
Bio: Elena Velichko is an academic researcher from Saint Petersburg State Polytechnic University. The author has contributed to research in topics: Ferrofluid & Magnetic field. The author has an hindex of 15, co-authored 117 publications receiving 797 citations.
Papers
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TL;DR: In this article, a technique for studying the magnetic susceptibility of colloidal solutions in a hermetically sealed glass volume (a ferrofluidic cell) is proposed, which is based on the fact that the thermal motion of molecules destroys conglomerates with antiparallel magnetic moments of nanoparticles that have a binding energy of the order of k−ε.
Abstract: A technique for studying the magnetic susceptibility of colloidal solutions in a hermetically sealed glass volume (a ferrofluidic cell) is proposed. Experimental investigations have shown that Curie’s law holds in the temperature range of 283–323 K at which ferrofluidic cells are used. A further increase in the temperature of a colloidal solution in a ferrofluidic cell leads to an increase in the Curie constant C, which is due to the fact that the thermal motion of molecules destroys conglomerates with antiparallel magnetic moments of nanoparticles that have a binding energy of the order of kТ.
53 citations
TL;DR: In this paper, a method of measuring weak magnetic fields by a nutation nuclear-magnetic teslameter in a flowing fluid is considered and the technical requirements both for the different components of the construction of the tesrameter itself, and for the parameters of the flowing fluid, are determined experimentally and theoretically.
Abstract: A method of measuring weak magnetic fields by a nutation nuclear-magnetic teslameter in a flowing fluid is considered The technical requirements both for the different components of the construction of the teslameter itself, and for the parameters of the flowing fluid, are determined experimentally and theoretically The proposed working fluids are investigated The operation of the measuring sensor of the teslameter in pure water is tested Further ways of improving the teslameter and its accuracy characteristics are determined
47 citations
TL;DR: In this article, the design of a compact nuclear magnetic relaxometer is described, which is capable of measuring longitudinal T 1 and transverse T 2 relaxation times of condensed media in a weak magnetic field with B 0 = 62 mT.
Abstract: The design of a compact nuclear magnetic relaxometer is described. This relaxometer is capable of measuring longitudinal T
1 and transverse T
2 relaxation times of condensed media in a weak magnetic field with B
0 = 62 mT. The Giulotto method in a weak magnetic field is used in the relaxometer design to measure T
1. The NMR signal accumulation circuit has been developed for measuring relaxation times of small-volume samples (1.0–1.5 mL) at a signal-to-noise ratio of 1.2.
47 citations
01 Nov 2016
TL;DR: In this paper, a new algorithm for the solution of the inverse problem of laser correlation spectroscopy is proposed, which allows one to analyse sizes of nanoparticles in polydisperse solutions.
Abstract: A new algorithm for the solution of the inverse problem of laser correlation spectroscopy is suggested. The algorithm allows one to analyse sizes of nanoparticles in polydisperse solutions. Experimental results demonstrating the efficiency of our approach are presented.
44 citations
TL;DR: The results obtained in the experimental studies of the factors that affect the intensity and spatial distribution of the laser radiation scattered by magnetic particles and their agglomerates in a magnetic field are reported in this article.
31 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
01 Jan 2016
TL;DR: The regularization of inverse problems is universally compatible with any devices to read and is available in the book collection an online access to it is set as public so you can download it instantly.
Abstract: Thank you for downloading regularization of inverse problems. Maybe you have knowledge that, people have search hundreds times for their favorite novels like this regularization of inverse problems, but end up in malicious downloads. Rather than reading a good book with a cup of tea in the afternoon, instead they juggled with some infectious bugs inside their computer. regularization of inverse problems is available in our book collection an online access to it is set as public so you can download it instantly. Our book servers spans in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the regularization of inverse problems is universally compatible with any devices to read.
1,097 citations
TL;DR: In this article, the design, fabrication, and performance of chip-scale atomic clocks, magnetometers, and gyroscopes are discussed and many applications in which these novel instruments are being used.
Abstract: Chip-scale atomic devices combine elements of precision atomic spectroscopy, silicon micromachining, and advanced diode laser technology to create compact, low-power, and manufacturable instruments with high precision and stability. Microfabricated alkali vapor cells are at the heart of most of these technologies, and the fabrication of these cells is discussed in detail. We review the design, fabrication, and performance of chip-scale atomic clocks, magnetometers, and gyroscopes and discuss many applications in which these novel instruments are being used. Finally, we present prospects for future generations of miniaturized devices, such as photonically integrated systems and manufacturable devices, which may enable embedded absolute measurement of a broad range of physical quantities.
288 citations
13 Mar 2007
TL;DR: In this article, the design, fabrication, and performance of chip-scale atomic clocks, magnetometers, and gyroscopes are discussed and many applications in which these novel instruments are being used.
Abstract: Chip-scale atomic devices combine elements of precision atomic spectroscopy, silicon micromachining, and advanced diode laser technology to create compact, low-power, and manufacturable instruments with high precision and stability. Microfabricated alkali vapor cells are at the heart of most of these technologies, and the fabrication of these cells is discussed in detail. We review the design, fabrication, and performance of chip-scale atomic clocks, magnetometers, and gyroscopes and discuss many applications in which these novel instruments are being used. Finally, we present prospects for future generations of miniaturized devices, such as photonically integrated systems and manufacturable devices, which may enable embedded absolute measurement of a broad range of physical quantities.
118 citations
01 Jan 2011
TL;DR: Saliva has the potential to become a first-line diagnostic sample of choice owing to the advancements in detection technologies coupled with combinations of biomolecules with clinical relevance.
Abstract: *This article is free to read on the publisher's website*
BACKGROUND:
Over the past 10 years, the use of saliva as a diagnostic fluid has gained attention and has become a translational research success story. Some of the current nanotechnologies have been demonstrated to have the analytical sensitivity required for the use of saliva as a diagnostic medium to detect and predict disease progression. However, these technologies have not yet been integrated into current clinical practice and work flow.
CONTENT:
As a diagnostic fluid, saliva offers advantages over serum because it can be collected noninvasively by individuals with modest training, and it offers a cost-effective approach for the screening of large populations. Gland-specific saliva can also be used for diagnosis of pathology specific to one of the major salivary glands. There is minimal risk of contracting infections during saliva collection, and saliva can be used in clinically challenging situations, such as obtaining samples from children or handicapped or anxious patients, in whom blood sampling could be a difficult act to perform. In this review we highlight the production of and secretion of saliva, the salivary proteome, transportation of biomolecules from blood capillaries to salivary glands, and the diagnostic potential of saliva for use in detection of cardiovascular disease and oral and breast cancers. We also highlight the barriers to application of saliva testing and its advancement in clinical settings.
SUMMARY:
Saliva has the potential to become a first-line diagnostic sample of choice owing to the advancements in detection technologies coupled with combinations of biomolecules with clinical relevance. (C) 2011 American Association for Clinical Chemistry
112 citations