San Francisco, CA, United States
San Francisco, CA, United States

URS Corporation was an engineering, design, and construction firm and a U.S. federal government contractor. Headquartered in San Francisco, California, URS was a full-service, global organization with offices located in the Americas, Europe, Africa, and Asia-Pacific. URS was acquired by AECOM on October 17, 2014. Wikipedia.


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News Article | December 5, 2016
Site: www.prweb.com

The Greater Dallas Planning Council (GDPC) continues to recognize excellence in local urban planning and design through their yearly Urban Design Awards Reception. The 2016 winners will be honored this Tuesday, December 6, from 6:00 p.m. to 9:30 p.m. at the Latino Cultural Center. The Awards will highlight individuals, groups and communities for their contribution to making the region a better place to live. A jury comprising professionals in planning, engineering and architecture review the proposals and recommend those projects and individuals that merit special recognition. The 2016 Urban Design Award categories and winners are: BUILT PROJECT AWARD - completed within the last five years and improves the character, sense of place and fabric of the community, and has, or has the potential to, catalyze positive change in the built environment Winner: Garland City Center Design/Firm/Parties of Interest: City of Garland; Oaks Properties, LLC; Consultant Team: VAI Architects; JHP architecture/urban design; David C. Baldwin Incorporated Honorable Mention: Cedar Crest Bridge Design/Firm/Parties of Interest: City of Dallas; Cedar Crest Neighborhood Association; Consultant Team: Halff Associates, Inc. with Bowman-Melton Associates, Inc., Baker Consulting Associates, Salcedo Group, Urban Engineers and Better Block Honorable Mention: DART Blue Line Design/Firm/Parties of Interest: Dallas Area Rapid Transit (DART); City of Dallas, City of Dallas Parks and Recreation Department, Dallas Police Department and University of North Texas at Dallas; Consultant Team: URS Corporation; Blue Alliance Partners (BAP) a Joint Venture which includes HNTB Corporation and Dikita Enterprises, Inc.; South Oak Cliff Alliance (SOCA) a Joint Venture consisting of Archer Western Contractors, Phillips/May Corporation, and Robinson Industries; UNT Dallas Station Artist - Annette Lawrence; Camp Wisdom Station Artist - Anitra Blayton; Ledbetter Station Artist - Johnice Parker Honorable Mention: Durham Neighborhood Park Design/Firm/Parties of Interest: Owner: City of Richardson; Project Stakeholders and Drivers: Richardson Heights Neighborhood Association and Cottonwood Heights Neighborhood Association; Designer: Studio Outside DREAM/UNBUILT PROJECT AWARD - exemplifies best practices in urban design and employs innovative strategies to improve the quality of place and quality of life in the community Winner: Southwestern Medical District Urban Streetscape Master Plan Design/Firm/Parties of Interest: Texas Trees Foundation (TTF); Southwestern Medical District (SWMD); Prime Consultant: Design Workshop; Sub-Consultant: Dahlberg Landscape Design Studio Honorable Mention: Historic Preservation Task Force Report Design/Firm/Parties of Interest: City of Dallas; Downtown Dallas Historic Preservation Task Force Honorable Mention: Neighborhood Plus Design/Firm/Parties of Interest: City of Dallas, Planning and Urban Design Department; Consultant Team: Fregonese Associates; Marquez Community Strategy DUNNIGAN MEDIA AWARD - demonstrates excellence in reporting in any media on issues affecting quality growth of the region KESSLER AWARD - demonstrates a lasting and significant commitment along with sustained sensitivity to the urban environment Winner: Frank Turner, Fellow of the Institute of Certified Planners (FAICP) URBAN PIONEER AWARD - exemplifies risk-taking and innovation in the field A brief annual member meeting will also take place to elect and welcome the 2017 GDPC Board of Directors and Officers, followed by a reception to honor the GDPC's winners and to salute some great design work in DFW. The event is organized by a committee of volunteers and chaired by Brian Keith, Associate Principal at JHP Architecture / Urban Design. Mike Grace, Managing Principal, Metro Development Consulting, is vice chair. Sponsors of the program include, Title Sponsor: HKS, Benefactors and Supporters: AECOM, Halff Associates, JHP Architecture / Urban Design, Lawton Reprographic Centers, AIA Dallas, Allison+Partners, Arredondo, Zepeda & Brunz, LLC, Bowman-Melton Associates, Inc., The College of Architecture, Planning and Public Affairs (CAPPA) at UTA , DRW Planning, DSGN Associates, Kimley-Horn and Associates, Inc., Oncor, PGAL, Ridley Law Firm, P.C., Robert Reeves & Associates, Inc., VAI Architects. About GDPC The Greater Dallas Planning Council (GDPC), founded in 1946, is the oldest Dallas area civic organization that focuses on issues shaping regional growth. The members of the GDPC address a range of issues from a broad range of community and professional perspectives. The GDPC's membership is comprised of a group of successful professionals from architect design firms, planning consultants, construction and engineering firms, developers, real estate industry leaders, community and civic organizations, corporations and municipal entities. The GDPC membership also includes elected or appointed officials. The GDPC members evaluate local and regional policies in order to promote the long-term sustainability of the City of Dallas and surrounding region. To find out more about GDPC visit http://www.gdpc.org.


News Article | February 22, 2017
Site: www.eurekalert.org

LOS ALAMOS, N.M., Feb. 22, 2017--In a new study published today in the journal PLOS ONE, Los Alamos National Laboratory scientists have taken a condensed matter physics concept usually applied to the way substances such as ice freeze, called "frustration," and applied it to a simple social network model of frustrated components. They show that inequality of wealth can emerge spontaneously and more equality can be gained by pure initiative. It's a computer-modeling exploration of the 19th-century Horatio Alger theme, whereby a motivated young person overcomes poor beginnings and lives the "rags to riches" life thanks to strength of character. "Most theories of wealth inequality rely on social stratification due to income inequality and inheritance," said Cristiano Nisoli, of the Physics of Condensed Matter and Complex Systems group at Los Alamos and lead author of the study. "We consider, however, the possibility that in our more economically fluid world, novel, direct channels for wealth transfer could be available, especially for financial wealth." The work stems from Los Alamos research into computational material science, with broader applications to materials physics, energy security and weapons physics. In this case, the study's authors used computer modeling to conceptualize the situation of a set of agents, endowed with opportunities to acquire available wealth. As Nisoli describes it, "we assume that the possession of wealth endows the user with the power to attract more wealth." The team of Benoit Mahault (visiting from Université Paris Saclay), Avadh Saxena and Nisoli divided the problem into three sets of problems: The first set of results shows that in a static society--where the allocation of opportunities does not change in time--the "law of the jungle" allows anyone to gain wealth from or lose it to anyone else. Relative chaos ensues. The second set of results also pertains to static societies, but ones in which transactions of wealth are regulated. People cannot gain or lose wealth from just anybody, but only from their neighbors in the network in which they are linked. This scenario leads to substantially more fairness in the mathematical benchmark cases of Erdös models for random networks and of Barabasi-Albert algorithms for scale-free networks. However, marked differences between the two appear when it comes to overall rather than subjective fairness. The third set of results pertains to dynamic societies. Maintaining the overall wealth level as fixed, the researchers allow agents to freely shift links among themselves as their own initiative drives them. This is where the concepts of power, frustration and initiative, previously benchmarked on static markets, become crucial. Their interplay results in a complex dynamic. At a low level of initiative, results converge to more or less ameliorated inequality where the power of wealth concentrates and wins. At high initiative levels, results converge to strong equality where power never concentrates. For initiative levels somewhere in between, we see the interplay of three emergent social classes: lower, middle and upper. Said Nisoli, "If driven by power alone, the market evolution reaches a static equilibrium characterized by the most savage inequality. Power not only concentrates wealth, but reshapes the market topology to concentrate the very opportunities to acquire wealth on only a few agents, who now amass all the wealth of the society." This equilibrium scenario however, does not take into account personal frustration and initiative to act. If those elements are introduced, at sufficient initiative, a cyclical dynamic of three social classes emerges. "Periodically, a long 'time of inequality' is contrasted by the patient effort of the middle class to rise up, to bring down the upper class and to merge with it. When that finally happens, however, the situation proves unstable: a single egalitarian class forms for a brief time, only to be soon disrupted by the appearance of difficult-to-predict 'black swan' economic events. The power of the latter, now competing against unfrustrated and thus demotivated agents of an egalitarian class, wins easily and a new time of inequality is brought in as a new middle class emerges while the upper-class rises," Nisoli explained. To encapsulate the concept, he said, "We learn from this analysis that in our admittedly simplified model, equality can be improved either by proper engineering of a static market topology, which seems impracticable, or by dynamic emergent reshaping of the market via sufficient individual initiative to act upon frustration." But a successful society, with reduced frustration and improved equality, does not continue for long. "Equality is short lived, we find, as the disappearance of frustration that follows equality removes the fundamental drive toward equality. Perhaps a key element in preventing the cyclical return of inequality would be memory, which is absent from our framework. But then, is it present in a real society?" The paper, "Emergent Inequality and Self-Organized Social Classes in a Network of Power and Frustration," appears in this week's PLOS ONE. Link: http://journals. This research was funded by the U.S. Department of Energy, the Los Alamos National Laboratory Center for Nonlinear Studies, the Los Alamos Institute for Materials Science and Laboratory Directed Research and Development. Los Alamos National Laboratory, a multidisciplinary research institution engaged in strategic science on behalf of national security, is operated by Los Alamos National Security, LLC, a team composed of Bechtel National, the University of California, BWX Technologies, Inc. and URS Corporation for the Department of Energy's National Nuclear Security Administration. Los Alamos enhances national security by ensuring the safety and reliability of the U.S. nuclear stockpile, developing technologies to reduce threats from weapons of mass destruction, and solving problems related to energy, environment, infrastructure, health and global security concerns.


Tafen D.N.,U.S. National Energy Technology Laboratory | Tafen D.N.,URS Corporation | Long R.,University College Dublin | Prezhdo O.V.,University of Rochester
Nano Letters | Year: 2014

Assumptions about electron transfer (ET) mechanisms guide design of catalytic, photovoltaic, and electronic systems. We demonstrate that the mechanism of ET from a CdSe quantum dot (QD) into nanoscale TiO2 depends on TiO2 dimensionality. The injection into a TiO2 QD is adiabatic due to strong donor-acceptor coupling, arising from unsaturated chemical bonds on the QD surface, and low density of acceptor states. In contrast, the injection into a TiO2 nanobelt (NB) is nonadiabatic, because the state density is high, the donor-acceptor coupling is weak, and multiple phonons accommodate changes in the electronic energy. The CdSe adsorbant breaks symmetry of delocalized TiO2 NB states, relaxing coupling selection rules, and generating more ET channels. Both mechanisms can give efficient ultrafast injection. However, the dependence on system properties is very different for the two mechanisms, demonstrating that the fundamental principles leading to efficient charge separation depend strongly on the type of nanoscale material. © 2014 American Chemical Society.


A mathematical model based on the advection-dispersion equation, modified to account for growth, decay, attachment, and detachment of microorganisms, was developed to describe the transport and growth of bacteria in aquifers. Column experiments on the transport of a species of sulfate-reducing bacteria through saturated-aquifer sediment were conducted to gain a quantitative knowledge of the attachment and detachment processes. Relevant parameter values such as the attachment-site capacity of the sediment and the attachment and detachment coefficients under different conditions, were obtained by fitting the experimental data with the non-growth condition transport model. The transport model was then refined and improved to incorporate the microbial sulfate reduction mechanism. To evaluate the applicability of this model, bacterial transport in aquifers under both nutrient-rich and oligotrophic environments was modeled by employing the parameters gained from experiments and from available literature; the model results were consistent with observations reported in former studies. In addition, the results revealed that the distribution of bacteria in the aqueous phase and in the sediments is directly related to the attachment-site capacity of the sediment. Thus, the attachment-site capacity of the sediment is a key factor to evaluate the transport and growth of bacteria in aquifers. © 2009 Springer-Verlag.


Batu V.,URS Corporation
Ground Water | Year: 2010

Using a steady-state mass conservative solute transport analytical solution that is based on the third-type (or flux-type or Cauchy) source condition, a method is developed to estimate the degradation parameters of solutes in groundwater. Then, the inadequacy of the methods based on the first-type source-based analytical solute transport solution is presented both theoretically and through an example. It is shown that the third-type source analytical solution exactly satisfies the mass balance constraint at the inlet location. It is also shown that the first-type source (or constant source concentration or Dirichlet) solution fails to satisfy the mass balance constraint at the inlet location and the degree of the failure depends on the value of the degradation as well as the flow and solute transport parameters. The error in the first-type source solution is determined with dimensionless parameters by comparing its results with the third-type source solution. Methods for estimating the degradation parameter values that are based on the first-type steady-state solute transport solution may significantly overestimate the degradation parameter values depending on the values of flow and solute transport parameters. It is recommended that the third-type source solution be used in estimating degradation parameters using measured concentrations instead of the first-type source solution. Copyright © 2010 The Author(s). Journal compilation © 2010 National Ground Water Association.


An improvement in the method for preventing re-emissions of mercury from a wet flue gas desulfurization (FGD) system by addition of an additive to the FGD scrubber liquor which interacts in the system scrubber with mercury present in the flue gas to curtail the mercury re-emissions; the mercury re-emissions are reduced to substantially zero by use of an additive selected from one or more members of the group consisting of a dithiol, a dithiolane, and a thiol having a single thiol group and either an oxygen or a hydroxyl group.


A novel solar heat collector (1) is presented for heating a circulating fluid with an inner glass tube (3) and an outer glass tube (6). The glass tubes are connected at their open ends (4, 7), and the space between the inner tube (3) and the outer tube (6) being evacuated, whereas the inner space of the inner tube (3) being divided by an insert (10) to define a first channel (11) and a second channel (12). Said channels are connected at the closed end (5) of the inner tube. The inner glass tube (3) and the outer glass tube (6) have smooth inner and outer surfaces and the insert (10) is provided such that the first and second channels (11, 12) and a space (13) between the end of the insert (10) and the closed end (5) of the inner tube (3) define the same cross-section.


An improvement in the method for preventing re-emissions of mercury from a wet flue gas desulfurization (FGD) system by addition of an additive to the FGD scrubber liquor which interacts in the system scrubber with mercury present in the flue gas to curtail the mercury re-emissions; the mercury re-emissions are reduced to substantially zero by use of an additive selected from one or more members of the group consisting of a dithiol, a dithiolane, and a thiol having a single thiol group and either an oxygen or a hydroxyl group.


Patent
URS Corporation | Date: 2015-08-12

Processes and methods exist for decreasing emissions of mercury upon combustion of fossil fuels such as coal. Halide salts can be effective when used at locations where they are thermally decomposed to form reactive halogen species, or in combination with an adsorbent material such as activated carbon. Halide salts, such as calcium bromide and sodium bromide, are not typically used at locations downstream of the economizer, where the temperature is typically below around 500 C, because these salts are non-thermolabile and do not decompose to produce reactive halogen species. However, in flue gas streams that certain flue gas constituents, such as sulfur trioxide or sulfuric acid, reactive halogen species can be produced via chemical reaction. These species react with elemental mercury through various means to form an oxidized form of mercury that is more easily captured in downstream pollution control devices such as particulate control devices or SO2 scrubbers.


Ross J.A.,URS Corporation
African journal of reproductive health | Year: 2012

National surveys show a remarkable upsurge in the use of injectable contraceptives in east and South Africa, in contrast to central and West Africa and certain other regions. Data are analyzed here from 95 surveys conducted since 1980 in 38 sub-Saharan African countries, to determine past injectable trends in the context of alternative methods and to explore related issues. In eastern and southern countries injectable use has risen to about 15%-20% of married women, equaling about 40% of all contraceptive use, with some countries above that. Increases in total use have followed increases in injectable use; that and other evidence is clear that the injectable has not merely substituted for the use of pre-existing methods but has given a net increase to total use. Rural use patterns are not much different from urban ones; however the middle and higher wealth quintiles have especially moved toward injectable use. In west and central countries traditional methods are still paramount, with modern methods increasing slightly, but total use remains quite low there. So far no plateau has appeared in total injectable use, though one may be emerging in its share of all use as other methods also increase. Most use is supplied through the public sector, which raises long-term cost issues for health ministries and donors. Many sexually active, unmarried women use the method Discontinuation rates are quite high, and alternative methods need to be kept readily available.

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