Perapechka I.,BSU |
Physical Review D | Year: 2017
We investigate the properties of spherically symmetric black-hole solutions in the generalized Einstein-Skyrme model theory in four-dimensional asymptotically anti-de Sitter spacetime. The dependences of the Skyrmion fields on the cosmological constant and on the strength of the effective gravitational coupling are examined. We show that the increase of the absolute value of the cosmological constant qualitatively yields the same effect as increasing the effective gravitational coupling. We confirm that, similar to the model in asymptotically flat spacetime, a necessary condition for the existence of black holes with Skyrmionic hair is the inclusion of the Skyrme term. © 2017 American Physical Society.
Acus A.,Vilnius University |
Halavanau A.,BSU |
Norvaisas E.,Vilnius University |
Shnir Y.,BSU |
Shnir Y.,Carl von Ossietzky University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012
We study the effect of the canonical quantization of the rotational mode of the charge Q=1 and Q=2 spinning Hopfions. The axially-symmetric solutions are constructed numerically, it is shown the quantum corrections to the mass of the configurations are relatively large. © 2012 Elsevier B.V.
Dikonov V.G.,Russian Academy of Sciences |
Komp'juternaja Lingvistika i Intellektual'nye Tehnologii | Year: 2014
There are areas in computational linguistics, where a word-sense tagged corpus becomes a necessary prerequisite or gives a significant boost to research. Unfortunately, publicly available corpora of this kind are extremely rare and making them from scratch is a very long and costly process. No corpus of Russian with unambiguous word-sense tags has been published so far. This paper describes an experimental approach of creating a virtual equivalent of a Russian sense tagged corpus and putting it to some real use. The virtual corpus was created using two public resources: The English SemCor corpus and our free multilingual semantic pivot dictionary, called the "Universal Dictionary of Concepts". The dictionary provides information sufficient to find sense-specific translations for nearly all sensetagged words in SemCor. However, the pivot dictionary itself is under development and we are looking for the ways to improve it. We used the existing Russian volume of the pivot dictionary to calculate lexical context vectors for individual senses of 13,832 Russian words, supposedly equivalent to the vectors that could be obtained from a real Russian translation of SemCor. Another set of vectors representing real usage of the same Russian words was extracted from a medium-size corpus of Russian without any semantic markup. The vector similarity score proved to be a useful factor in judging the correctness of links between Russian words and word senses similar to ones registered in the Princeton Wordnet. It helped to rank over 21,000 of such links out of 56,000 known and significantly reduce the amount of the manual work required to proofread the dictionary.
Malevich A.E.,BSU |
Mityushev V.V.,Pedagogical University of Cracow |
Adler P.M.,University Pierre and Marie Curie
Journal of Colloid and Interface Science | Year: 2010
Electroosmotic flows are studied in wavy channels by expanding the solution into a double series in terms of the dimensionless amplitudes and of the dimensionless zeta potential for a binary dilute electrolyte. The expansion technique by means of formal calculations is described. Some examples are illustrated and discussed for two- and three-dimensional channels. The importance of the varicose or sinuous character of the channels as well as the role of high frequency roughness are demonstrated. These features may be used for practical purposes in order to amplify or diminish coupling effects in an algebraic way. © 2010 Elsevier Inc. All rights reserved.
Adler P.M.,University Pierre and Marie Curie |
Malevich A.E.,BSU |
Mityushev V.V.,Pedagogical University of Cracow
Acta Mechanica | Year: 2013
For low Reynolds numbers ℝ, the flow of a viscous fluid through a channel is described by the well-known Darcy's law which corresponds to a linear relation between the pressure gradient ∇̄p}} and the average velocity ū. When the channel is not straight and when the Reynolds number is not negligible, additional terms appear in this relation. Some previous authors investigated the first three coefficients in the expansion of |∇̄p| in the powers of ū and they showed that the coefficient of ū2 vanishes for moderate ℝ. Other authors demonstrated that this coefficient can be non-zero. This question is addressed and solved. It is demonstrated that both cases occur; Forchheimer's law has a cubic correction for small ℝ and a quadratic one for large ℝ. Two analytical-numerical algorithms are constructed to prove this property. These algorithms are applied to the Navier-Stokes equations in three-dimensional channels enclosed by two wavy walls whose amplitude is proportional to bε, where 2b is the mean clearance of the channels and ε is a small dimensionless parameter. The first algorithm is applied for small ℝ by representing the velocity and the pressure in terms of a double Taylor series in ℝ and ε. The accuracy O(ℝ2) and O(ε6) following Padé approximations yield analytical approximate formulae for Forchheimer's law. The first algorithm is applied to symmetric channels on the theoretical level (all terms on ℝ and ε are taken into account) to show that |∇̄p| is an odd function of ū. This observation yields, in particular, a cubic correction to Darcy's law. Numerical examples for non-symmetrical channels yield the same cubic correction. The second algorithm is based on the analytical-numerical solution to the Navier-Stokes equations for arbitrary ℝ up to O(ε3). This algorithm yields, in particular, a quadratic correction to Darcy's law for higher ℝ. © 2013 Springer-Verlag Wien.
Potapenko T.A.,Power Engineering Institute |
Shtifanov A.I.,BSU |
Potapenko A.N.,Power Engineering Institute
2014 International Conference on Lightning Protection, ICLP 2014 | Year: 2014
Paper presents statement of problem and the results of mathematical modeling of different schemes of lightning protection system (LPS) on example of launch pads and steel towers of power transmission lines (PTL). The method of mathematical modeling based on solving an elliptic equation (method MMSEE) with respect to the electric flow function is used for the calculation of family of force lines of electric field. The features of the applied MMSEE for problems of practical importance with a goal to calculate the electric force lines with respect to the grounding electrode near the buried part of a reinforced concrete pole are presented at the condition of rain. © 2014 IEEE.
Halavanau A.,BSU |
Romanczukiewicz T.,Jagiellonian University |
Shnir Y.,BSU |
Shnir Y.,Carl von Ossietzky University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012
We present a numerical study of the process of the kink-antikink collisions in the coupled one-dimensional two-component φ4 model. Our results reveal two different soliton solutions which represent double kink configuration and a kink-nontopological soliton (lump) bound state. Collision of these solitons leads to reveal very rich structure which is related to the reversible energy exchange between the kinks, nontopological solitons and the internal vibrational modes. Various channels of the collisions are discussed; it is shown there is a new type of self-similar fractal structure which appears in the collisions of the relativistic kinks. There the width of the resonance windows increases with the increase of the impact velocity. An analytical approximation scheme is discussed in the limit of the perturbative coupling between the sectors. Considering the spectrum of linear fluctuations around the solitons we found that the double kink configuration is unstable if the coupling constant between the sectors is negative. © 2012 American Physical Society.
News Article | December 7, 2016
SILICON VALLEY, CA--(Marketwired - Dec 7, 2016) - Proxim Wireless Corporation ( : PRXM), a pioneer and global leader in point to point (PtP) and point to multipoint (PtMP) wireless systems and advanced Wi-Fi, today announced the worldwide availability of its Tsunami® 10100L series supporting up to 400Mbps data rate and upgradeable to 866Mbps. With the Tsunami 10100L product line, Proxim continues to offer more for less. Operating at 256QAM in a 40Mhz channel, combined with our WORP protocol, means end users will see 300Mbps of useable data in a 40MHz channel. Offered at a price that continues to push the cost/performance metric, the Tsunami 10100L is a leader in the carrier class wireless infrastructure market in $/bit. The 10100L is based on the same hardware platform as the Tsunami 10100 series, meaning customers get the features they have come to expect from Proxim -- a rugged IP67 design, PoE out, Proxim Clear Connect, Fast Connect and more. The 10100L series includes several product variants including -- BSU, SUA, SUR, and QBs. This provides customers with a wide variety of applications and deployment options across the series. With the ability to software upgrade the 10100L to a full 10100 series, customers can "pay as they grow" by deploying the less expensive 10100L product, and upgrading to the full 866Mbps capacity when needed for a small upgrade fee. In addition, as always with Proxim products, Proxim maintains two generations of backwards compatibility. This means the 10100L, as well as the 10100, can interoperate with the Tsunami 800 and 8200 series products. Mixed networks are supported allowing existing networks to add the additional capacity supported by the 10k series when needed, or to start with a 10100 BSU and deploy the lower capacity, more cost effective 800 series products as subscriber units. "The Tsunami® 10100L has been designed for markets that are looking for carrier class communications but with moderate bandwidth requirements. This series makes our high performance solutions now more affordable with no compromises on quality," said Greg Marzullo, CEO and President, Proxim Wireless. To find out more about Proxim Wireless, please visit www.proxim.com or follow us on Twitter, LinkedIn and Google+. Like us on Facebook or go to our YouTube page for latest videos. About Proxim Wireless Proxim Wireless Corporation ( : PRXM) provides Wi-Fi®, Point-to-Point and Point-to-Multipoint 4G wireless network technologies for wireless Internet, video surveillance and backhaul applications. Our ORiNOCO® and Tsunami® product lines are sold to service providers, governments and enterprises with over 2.5 million devices shipped to 250,000+ customers in more than 90 countries worldwide. Proxim is ISO 9001:2008 certified. For more information, visit www.proxim.com. For investor relations information, e-mail firstname.lastname@example.org or call +1(408) 383 7615. Safe Harbor Statement Statements in this press release that are not statements of historical facts are forward-looking statements that involve risks, uncertainties, and assumptions. Our actual results may differ materially from the results anticipated in these forward-looking statements. The forward-looking statements involve risks and uncertainties that could contribute to such differences, including difficulties in overcoming the network installation and operational challenges relating to any specific customer or geographical area; factors beyond our control such as weather, geographic, governmental, and interference issues that may increase the costs and difficulties of wireless deployments; specific requirements of a given customer in their specific situations; whether the deployment will achieve the desired objectives of any given customer; changes in the timing, features, and other characteristics of products Proxim expects to introduce; and difficulties or delays in supplying products with the features, performance, compliances, certifications, cost, price, quality, and other characteristics desired by customers. Further information on these and other factors that could affect Proxim's actual results is contained in the filings made by Proxim with the OTC Markets (available at www.otcmarkets.com), including without limitation in the Annual Report filed by Proxim on March 30, 2010, and is and will be contained in its other public statements, which may be available on Proxim's website (www.proxim.com).
News Article | December 1, 2016
WILMINGTON, NC, December 01, 2016-- Rico Austin, author of 'My Bad Tequila', has been named as a finalist in the '50 Great Writers You Should Be Reading' Book Awards Contest. His honors came as a result of his appearance on The Authors Show. Rico Austin was chosen from a field of hundreds of authors through a public voting process. 'My Bad Tequila' details one man's epic journey across two continents and four countries with 50 years of adventure. But 1986 changed everything forever, when one event devastated the lives of 19 students, three chaperones and one bus driver. Was it the tequila?"I wrote this book," Austin stated, "because I had to purge myself of this fateful Spring Break trip of 1986. I felt the need to share the perils of binge drinking, engaging in irresponsible sex and what happens when college and high school students don't think twice about what happens when bad decisions are made and acted upon.""Thinking about sending your 'Kids' to paradise unsupervised? THINK AGAIN.""You'll see the true reflection of me when the tequila bottle is empty." - Rico AustinAustin has won numerous writing awards throughout his writing career:Hollywood Book Festival - Honorable Mention (Wild Card genre 2011)Readers Favorite Book Awards - Silver (Fiction - Mystery - General genre 2011)Amazon eKindle - #1 Top Rated Kindle eBooks (Mexico Travel genre 2011)"Five Parrots in a Palm Tree" - Superb Island Reading award 2011#1 Book to Read, June 2011 - NY Professional Reviewer, Fran LewisReaders Favorite Book Awards - Finalist (Fiction - General genre 2011)Arizona Authors Association - 3rd Place (Fiction Book of the Year 2011 - 2012)London Book Festival - Honorable Mention (Wild Card genre 2012)Los Angeles Book Festival - Honorable Mention (Wild Card genre 2011-2012)New York Beach Book Festival - Honorable Mention (General Non-Fiction genre 2012)New Mexico - Arizona Book Awards - Finalist (Fiction - Mystery genre 2012)Bibliocracy.com - Author of the Month (June 2012)Suspense Magazine - Review & Article (July 2012 issue)tBook Town - February's Book of the Month (March 2013)Austin is also the author of a number of other books:'In the Shadow of ELVIS, Perils of a Ghostwriter' - Autobiography, Memoir; This is the true story of how and when Rico met the legitimate, illegitimate son of the King of Rock 'n' Roll, Mr. Elvis Presley. These are the trials and tribulations of ghostwriting John Dennis Smith's epic and incredible mystery of being adopted and discovering his birthright.'ARIZONA Is Where I Live' - Children's book; ARIZONA Is Where I Live is a masterful and learning display of the Sonoran Desert, the mountains, the lakes, the Grand Canyon and of the animals that make Arizona one of the most unique and interesting states in the Union.'Son of the KING, an ELVIS Paradox Unveiled' - Biography; This biography is the true story of Elvis the King of Rock n' Roll and his legitimate, illegitimate son. This book explores the relationships of those closest to Elvis Presley and the influences each of them had that kept Elvis from claiming his first born John Smith Presley.'MEXICO Got LUCKY' - Non Fiction; Lucky, the most famous dog in all of Sonora, Mexico was dog napped on March 1st, 2014. Was it a prank gone bad by teenagers? Did it involve the ruthless, Sinaloa Drug Cartel, deadliest in the world? Or was it just a lowlife dog thief?'Author, Artist & Anyone's Personal Marketing Guide: Financial Success with 11 Proven Promotions Including Blogs & Social Media' is Rico's sixth book.'Entrepreneur, Realtor & Anyone's Personal Marketing Guide: Financial Success with 10 Proven Promotions Including Blogs & Social Media' was Rico's seventh book published.'BAJA LOCO, 4 Racing Days & Tequila Nights on the NORRA Mexican 1000' - Memoir: This is the true adventure of the Azunia Tequila / General Tire race team and author Rico Austin's journey of the 2014 Mexican BAJA 1000 which was published this last November 2016.Members of the public who want to vote for Rico Austin in the '50 Great Writers You Should Be Reading' Book Awards can access his entry and vote at The Authors Show site at http://www.TheAuthorsShow.com . Rico Austin is available for media interviews and can be reached using the information below, or by email at email@example.com . All of Austin's books are available at online retail book outlets. More information is available at Rico Austin's website at http://blog.mybadtequila.com Rico Austin earned an Associate Degree in Marketing and Sales from BSU. Rico moved to the Phoenix/Scottsdale area and continued his education receiving a Bachelors of Business Administration in International Business at Grand Canyon University, named the "Outstanding International Business Graduate of 1995." That same year he was also selected as "Mr. Future Business Executive" at the State Leadership Conference which included all universities in the State of Arizona.The summer before graduating, Rico went to Vilnius, Lithuania, and taught English (ESL). During fall semester of his senior year at GCU, Rico attended Staffordshire University in England where he also started on the American Football Team for the Staffordshire Stallions. Rico finished his Masters, an MBA in International Management at Thunderbird School of Global Management with a focus on the Latin America Region and the Spanish language. He appeared in a cameo appearance on Baywatch where he played the role of a drug lord.Rico was selected for the May 19th, 2013 issue to represent Arizona in fellow author, Annette Synder's popular blog, Fifty Authors from Fifty States, which spotlights writing professionals across the Fifty United States. He was again chosen to represent his home state of Idaho on March 23rd, 2014, and was named for writing about Arizona on January 17th, 2016. Rico was also chosen from among several hundred writers and bloggers to help compile a booklet with 13 other prominent authors. 'How to Create Credibility as a Freelancer - 70 Tips from a Collection of Experts' was published in December 2009.
News Article | December 7, 2016
Rasheed Auguste remembers the exact moment he fell in love with nuclear engineering. As a freshman in high school, Auguste participated in the Junction summer program offered by the MIT Educational Studies Program. For two weeks he took classes in the afternoon, ate dinner, and then attended an evening seminar. One was given by a graduate student in the Department of Nuclear Science and Engineering. “It was the most interesting hour that I’ve spent in my life. I don’t think I blinked,” says the MIT senior. “I was sold on MIT, and I was sold on nuclear engineering from that one seminar. So now I’m here, living the dream.” Auguste, who is double majoring in nuclear science and engineering and physics and minoring in energy studies, has spent the last three years researching nuclear reactors, and is eager to continue this path in graduate school. Both of his parents emigrated from Haiti to Boston as teenagers and completed master’s degrees in the U.S. “When I was born, the standard was, ‘we have master’s degrees; a PhD is the next step for this next generation.’ That was always the bar,” says Auguste. “It just so happens I got lucky. I actually do want this PhD that was prescribed from birth.” But Auguste hasn’t let this plan keep him restricted to the lab; he has also become interested in the policies that underlie scientific research and higher education. Last year, he advocated for federal funding of basic science research and drafted nuclear energy policy in Washington. And at MIT, as one of the leaders of the Black Students’ Union, Auguste helped create and present 11 recommendations for making MIT more welcoming for all members of its community, especially underrepresented and minority students. By the time he started his first semester of classes, Auguste had already secured a grant through the Undergraduate Research Opportunities Program (UROP) in the lab of Mike Short, an assistant professor of nuclear science and engineering. There, Auguste has spent the last three years studying the accumulation of CRUD — chalk river unidentified deposits — on the sides of the cooling loops of nuclear reactors. CRUD reduces the efficiency of a reactor by preventing heat transfer, in some cases making it necessary to shut down the reactor for cleaning. Auguste began by improving a model system that artificially generated CRUD. After creating what is essentially a boiler to heat water, Auguste tested different materials to see which ones, when boiled over time, gave rise to CRUD. He then used atomic force spectroscopy to quantify how strongly individual CRUD particles adhered to the container. Auguste’s interest in renewable energy — produced by nuclear reactors and other sources — also led him to science policy. Last April he went to Washington with the Science Policy Initiative to the annual Science-Technology-Engineering Congressional Visits Day to advocate for basic-science research funding. “I liked that because it was using the research, but advocating for funding to people who have very limited scientific backgrounds. The language that you use changes, but the point has to be the same,” Auguste says. “That was a really cool opportunity for me to branch out from research in the lab and think about how that should be done, and can be done,” he adds. “It’s super important to make sure [funding] is stable and actually conducive to innovation.” He went back to Washington this July with the Nuclear Engineering Student Delegation. This program brought together a group of students from across the country to draft a policy agenda that they presented to Congress. “At the end of the day, it’s going to be ‘Fund nuclear research, please, thanks. So I can get a PhD, thanks,’” Auguste jokes. Auguste has consulted on policies at MIT, too. As a sophomore, he served as the secretary of the Black Students’ Union (BSU), and as a junior he became the BSU’s political action co-chair. Every year, the political action committee organizes a leadership initiative, but “I didn’t know what I wanted to do,” says Auguste, who felt anxious about the high bar set by former committee chairs. “Then came everything happening at Yale and University of Missouri, which was near the Black Lives Matter stuff that had gone on, but fine-tuned to college campuses, so it was even more pressure. Now it’s not just being a black person, but a black person in an institution of higher learning, specifically at a predominantly white institution. It was definitely like ‘ok what does MIT want to do?’ It was up to me to coordinate that response.” Students across the country began bringing lists of demands to their administrations, and as Auguste thought about how the BSU would respond, he and the leaders of the Black Graduate Student Association (BGSA) received an email from MIT President L. Rafael Reif, wanting to meet in the BSU lounge. “It’s great because it is our space, and [he] asked how we are doing during this time of national focus,” Auguste says. At the end of the meeting, Reif inquired about what he and the MIT administration could to do improve the lives of underrepresented minority students at MIT. In the following weeks, Auguste and his friend and fellow senior Alberto Hernandez joined with others from Chocolate City, the student community and living group that Auguste has been a part of since his first year. They began interviewing offices that deal with various aspects of student life — mental health, research, advising and academic programming — about specific things MIT could do to support minority students. But they also turned to students for recommendations. “You have to ask people what they can do, and you have to ask people what they want,” Auguste says. He and Hernandez held office hours, circulated Google forms, and visited student groups. “MIT does a lot of things well. We do data very very well, we listen to data very very well, and we like numbers. A pretty big chunk of the recommendations had to do with data, and how we are going to act on it,” Auguste says. He was one of five students who presented the final set of 11 recommendations to the Institute’s Academic Council in December 2015, and he served last year on a dedicated Academic Council working group convened by Vice President Kirk Kolenbrander and consisting of students, faculty, and senior officers. The council has been working to address these recommendations as well as a related set of recommendations from the BGSA, which were also presented last December. “An important piece of these recommendations is that they don’t exclusively focus on black students. They focus on students of all minority groups, race, religion, and creed,” Auguste says. Many of the recommendations have already been implemented, or pilot programs are underway. For the recommendations, which involve changes at the department level, Kolenbrander and Institute Community and Equity Officer Edmund Bertschinger are working with school deans to establish school-based approaches to these recommendations. “Everybody was very respectful and receptive to the ideas we were getting across, and very open to listening to the reasons why we had the suggestions that we did,” he says. Auguste’s efforts were recognized with the Dr. Martin Luther King Jr. Leadership Award this year.