Chernivtsi, Ukraine

Chernivtsi National University

www.chnu.edu.ua
Chernivtsi, Ukraine

Chernivtsi National University is the leading Ukrainian institution for higher education in northern Bukovina, in Chernivtsi, a city in western Ukraine. Wikipedia.

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Agency: European Commission | Branch: FP7 | Program: CP | Phase: SEC-2007-1.3-01;SEC-2007-4.3-03 | Award Amount: 2.64M | Year: 2008

The proposal concerns the technology development for instruments with the following capabilities: (a) To make spectroscopic measurements with efficiency equivalent to that of NaI detectors and energy resolution close to that of HPGe devices but without using cryogenic systems. (b) To find the direction and the distance of the radioactive source. (c) To localize the source into a cargo and estimate the radioactive source activity taking information about the source environment (shielding, absorption in the surrounding materials) (d) To work at a wide range of absorbed dose rates by adjusting the effective volume of the detector. The above capabilities will improve the quality of the data gathered by the customs officers during the routine inspections at the boarders and will assist the first responders in case of a radiological or nuclear emergency to estimate the exact situation. Basic tasks of the project will be: (a) The growth of high purity, detector grade Cd(Zn)Te crystals. Their performance will be optimized by material purification, selection of right dopants and post-growth processing to obtain high resistivity, high transport properties and homogeneous distribution of these material properties in the grown crystals. The growth of crystals with a diameter up to 75 mm will be performed. (b) The fabrication of pixel detectors having structure of p-n and Schottky diodes. This will permit the application of bias voltage high enough to collect all the induced charge by both electrons and holes. (c) The design of pixel electronics capable for simultaneous imaging and spectroscopy. The electronics will be bump bonded to the pixel detectors. This is essential for the localization and the identification of the radioactive source. (d) The construction of a portable instrument having a stack of detecting elements. This will allow to exploit the Compton Effect for the localization of the radioactive source and also to have variable detection efficiency.


Home > Press > Brookhaven's Oleg Gang Named a Battelle 'Inventor of the Year': Recognized for work using DNA to guide and regulate the self-assembly of nanoparticles into clusters and arrays with controllable properties Abstract: Oleg Gang, a physicist developing a novel strategy using DNA to guide the self-assembly of nanoparticles at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory, is being honored as an "Inventor of the Year" by Battelle, the global science and technology organization that, together with Stony Brook University, manages Brookhaven Lab through the company Brookhaven Science Associates. The annual awards recognize individuals who have made significant scientific or engineering contributions with important societal or financial impacts. Gang, whose work may lead to the design of new "tunable" materials for applications in energy, medicine, and more, was honored at a "Celebration of Solvers" held by Battelle at the Columbus Museum of Art in Ohio on April 22, 2016. Gang works at Brookhaven's Center for Functional Nanomaterials (CFN, https://www.bnl.gov/cfn/), a DOE Office of Science User Facility where scientists are seeking ways to take advantage of unusual properties that emerge by controlling the arrangements of particles whose dimensions are thousands of times smaller than the diameter of a human hair. Achieving specific arrangements of such small-scale building blocks is a huge challenge. Gang's strategy to overcome this challenge uses chains of synthetic DNA as a type of "glue" that encourages nanoparticles to assemble themselves in a desired way. The work could lead to the design of better catalysts, solar cells, biological sensors, and more. "I am very fortunate to work in the Brookhaven Lab team environment, rich with talented people and state-of-the-art facilities," said Gang. "This environment makes it possible to transfer ideas to realization efficiently, and there is nothing more exciting than to see that happening. " Gang's technique takes advantage of the specificity of binding between the four bases that make up strands of DNA (commonly known by the letters A, T, G, and C) and the ability to program DNA to get complementary strands and their tethered nanoparticles to link up into larger scale, three-dimensional, well-ordered structures. So far, this approach has resulted in a variety of nanoparticle assemblies, including composite structures with switchable phases whose optical, magnetic, or other properties might be put to use in dynamic energy-harvesting or responsive optical materials, and even materials with multifunctional, synergistic properties. "This work has opened a new direction for the self-assembly of nanoparticles, which makes it possible to design and prepare a new class of materials with novel properties, and whose long-term economic impact, though difficult to quantify at the moment, is undeniable," said Emilio Mendez, former director of the CFN and now Director of the Energy Science and Technology Department at Brookhaven Lab. Gang, who lives in Setauket, earned a bachelor's degree in physics from Chernivtsi National University, Ukraine, in 1991, a master's degree in physics and a Ph.D. in soft matter physics, both from Bar-Ilan University, in 1994 and 2000, respectively. He was a postdoctoral Rothschild Fellow at Harvard University from 1999 to 2002, joining BNL as a Goldhaber Fellow in 2002. He became an assistant scientist at the Lab's CFN in 2004, with a promotion to scientist in 2009, and has led the CFN's Soft and Biological Nanomaterials Theme Group since 2006. Gang holds five patents, and he has received several honors for his research, including the University Distinction Award and the University President's Award, both from Bar-Ilan University, a Wolf Foundation Scholarship for outstanding Ph.D. research, and the 2010 Gordon Battelle Prize for Scientific Discovery. In 2014 he was selected as a fellow of the American Physical Society. Gang's work at the CFN is funded by the DOE Office of Science (BES). About Brookhaven National Laboratory DOE's Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov. The Center for Functional Nanomaterials at Brookhaven National Laboratory is one of the five DOE Nanoscale Science Research Centers (NSRCs), premier national user facilities for interdisciplinary research at the nanoscale. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE's Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge and Sandia and Los Alamos national laboratories. One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE's Office of Science by Brookhaven Science Associates, a limited-liability company founded by the Research Foundation for the State University of New York on behalf of Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit applied science and technology organization. For more information, please click If you have a comment, please us. Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.


Zenkova C.Y.,Chernivtsi National University
Applied Optics | Year: 2014

Theoretical and experimental approaches to diagnosing internal spin and orbital optical flows and the corresponding optical forces caused by these flows are offered. These approaches are based on the investigation of the motion of the particles tested in the formed optical field. The dependence of the above-mentioned forces upon the size and optical properties of the particles is demonstrated. The possibility of using kinematic values defining the motion dynamics of particles of the Rayleigh light scattering mechanismto make a quantitative assessment of the degree of coherence ofmutually orthogonal waves that are linearly polarized in the incidence plane is demonstrated. The feasibility of using the above mentioned approach, its shortcomings, and its advantages over the interfering method for estimating the degree of coherence are analyzed. © 2014 Optical Society of America.


Ushenko Y.A.,Chernivtsi National University
Opto-electronics Review | Year: 2011

The optical model of human joints synovial fluid is proposed. The statistic (statistic moments), correlation (autocorrelation function) and self-similar (Log-Log dependencies of power spectrum) structure of polarization two-dimensional distributions (polarization maps) of synovial fluid has been analyzed. It has been shown that differentiation of polarization maps of joint synovial fluid with different physiological state samples is expected of scale-discriminative analysis. To mark out of small-scale domain structure of synovial fluid polarization maps, the wavelet analysis has been used. The set of parameters, which characterize statistic, correlation and self-similar structure of wavelet coefficients' distributions of different scales of polarization domains for diagnostics and differentiation of polycrystalline network transformation connected with the pathological processes, has been determined. © 2011 Versita Warsaw and Springer-Verlag Wien.


Brus V.V.,Chernivtsi National University | Maryanchuk P.D.,Chernivtsi National University
Carbon | Year: 2014

We proposed a simple, low-cost and environmentally friendly method for the reproducible fabrication of high quality next-generation pencil-on-semiconductor electronic, optoelectronic and photovoltaic devices by the transfer of dry drawn graphite films on arbitrary planar or nanostructured semiconductor substrates. The proposed transfer technique avoids damage of the surface of semiconductor substrates during the deposition of the drawn graphite films, which is critical for the fabrication of novel electronic and optoelectronic devices. © 2014 Elsevier Ltd. All rights reserved.


We investigate the processes of laser radiation transformation by biological crystal networks using the singular optics techniques. The obtained results show a distinct correlation between the points of " characteristic" values of coordinate distributions of Mueller matrix (M ik = 0, ±1) elements and polarization singularities (L- and C-points) in laser images of biological crystal networks with the following possibility of Mueller-matrix selection of polarization singularity. The technique of Mueller-matrix singular diagnostics of pathological changes in a woman's reproductive sphere tissue (myometrium) is proposed. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).


Cherkez R.,Chernivtsi National University
Applied Thermal Engineering | Year: 2012

This study presented the thermoelectric air conditioner unit based on permeable cooling thermoelements. In the thermoelectric air conditioner unit the air flow is cooled due to a combined action of thermoelectric effects and the Joule-Thomson effect. On the basis of the optimal control theory the method of designing permeabler thermoelement is described, which makes it possible to determine the optimal structural and thermophysical parameters, including the applied electrical current and the heat carrier velocity in the channels of thermoelements in the mode of maximum coefficient of performance (COP). Methods for calculation of temperature distribution, cooling capacity, determination of power conversion energy characteristics and thermoelement design in maximum COP mode when thermoelectric materials based on solid solutions of Bi 2Te 3 are given. Results of computer studies for the case of thermoelement legs based on Bi 2Te 3 material have shown the possibility of COP increase by a factor of 1.6-1.7 as compared to conventional thermoelectric systems. © 2012 Elsevier Ltd. All rights reserved.


Kosyachenko L.,Chernivtsi National University | Toyama T.,Osaka University
Solar Energy Materials and Solar Cells | Year: 2014

A comparison of the calculated results with the experimental data shows that the measured dark I-V characteristics of efficient thin-film CdS/CdTe cells are quantitatively described in terms of the Sah-Noyce-Shockley theory of generation-recombination in the space-charge region of the heterostructure. The expressions for the quantum efficiency spectra, taking into account the drift and diffusion components and recombination on the front and rear surfaces of the CdTe absorber layer, also describe the observed spectra in detail. The process of comparison and adjustment of the calculated results with the actual measurements provides a quite accurate determination of the main parameters of the CdTe layer and the diode structure, which in turn enables us to make some recommendations to correct these parameters to increase the efficiency of CdS/CdTe solar cells. © 2013 Elsevier B.V.


Linchuk Yu.S.,Chernivtsi National University
Complex Analysis and Operator Theory | Year: 2014

In this paper, we describe all derivation pairs of linear operators that act in spaces of functions analytic in domains. © 2014 Springer Basel.


Ushenko Y.A.,Chernivtsi National University
Journal of Biomedical Optics | Year: 2012

The complex technique of concerted polarization-phase and spatial-frequency filtering of blood plasma laser images is suggested. The possibility of obtaining the coordinate distributions of phases of linearly and circularly birefringent protein networks of blood plasma separately is presented. The statistical (moments of the first to fourth orders) and scale self-similar (logarithmic dependences of power spectra) structure of phase maps of different types of birefringence of blood plasma of two groups of patients-healthy people (donors) and those suffering from rectal cancer-is investigated. The diagnostically sensitive parameters of a pathological change of the birefringence of blood plasma polycrystalline networks are determined. The effectiveness of this technique for detecting change in birefringence in the smears of other biological fluids in diagnosing the appearance of cholelithiasis (bile), operative differentiation of the acute and gangrenous appendicitis (exudate), and differentiation of inflammatory diseases of joints (synovial fluid) is shown. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE).

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