Evaluation of the microstructure of Al-Cu-Li-Ag-Mg Weldalite (tm) alloys, part 4

Weldalite (trademark) 049 is an Al-Cu-Li-Ag-Mg alloy designed to have ultrahigh strength and to serve in aerospace applications. The alloy displays significantly higher strength than competitive alloys in both naturally aged and artificially aged tempers. The strengthening phases in such tempers have been identified to, in part, explain the mechanical properties attained. In general, the alloy is strengthened by delta prime Al3Li and Guinier-Preston (GP) zones in the naturally aged tempers. In artificially aged tempers in slightly underaged conditions, strengthening is provided by several phases including GP zones, theta prime Al2Cu, S prime Al2CuMg, T(sub 1) Al2CuLi, and possibly a new phase. In the peak strength artificially aged tempers, T(sub 1) is the predominant strengthening phase

Balancing Environmental Protection and Economic Development: What Do North Carolinians Want?

The latter part of the 1980s saw a revival of concern about environmental issues. These issues began to occupy more of policy makers' time and attention at both the national and local levels. Little has been done to evaluate public opinion about the difficult choices between the environment and growth and development, however. In October 1989, MarketSearch Corporation of Columbia, S.C., conducted a telephone survey of 1500 residents of North and South Carolina, 750 from each state, on economic development and the environment. The purpose of the study was to evaluate public opinions and attitudes about these two important areas and how people in the two Carolinas feel about them. This report focuses on the viewpoints of North Carolinians by highlighting some of the study's key findings

Comparison of mechanistic models in the initial rate enzymatic hydrolysis of AFEX-treated wheat straw

<p>Abstract</p> <p>Background</p> <p>Different mechanistic models have been used in the literature to describe the enzymatic hydrolysis of pretreated biomass. Although these different models have been applied to different substrates, most of these mechanistic models fit into two- and three-parameter mechanistic models. The purpose of this study is to compare the models and determine the activation energy and the enthalpy of adsorption of <it>Trichoderma reesei </it>enzymes on ammonia fibre explosion (AFEX)-treated wheat straw. Experimental enzymatic hydrolysis data from AFEX-treated wheat straw were modelled with two- and three-parameter mechanistic models from the literature. In order to discriminate between the models, initial rate data at 49°C were subjected to statistical analysis (analysis of variance and scatter plots).</p> <p>Results</p> <p>For three-parameter models, the HCH-1 model best fitted the experimental data; for two-parameter models Michaelis-Menten (M-M) best fitted the experimental data. All the three-parameter models fitted the data better than the two-parameter models. The best three models at 49°C (HCH-1, Huang and M-M) were compared using initial rate data at three temperatures (35°, 42° and 49°C). The HCH-1 model provided the best fit based on the F values, the scatter plot and the residual sum of squares. Also, its kinetic parameters were linear in Arrhenius/van't Hoff's plots, unlike the other models. The activation energy (<it>Ea</it>) is 47.6 kJ/mol and the enthalpy change of adsorption (Δ<it>H</it>) is -118 kJ/mol for <it>T. reesei </it>enzymes on AFEX-treated wheat straw.</p> <p>Conclusion</p> <p>Among the two-parameter models, Michaelis-Menten model provided the best fit compared to models proposed by Humphrey and Wald. For the three-parameter models, HCH-1 provided the best fit because the model includes a fractional coverage parameter (ϕ) which accounts for the number of reactive sites covered by the enzymes.</p

Cultural Resources Monitoring/Survey of a JTF-6 Action, Van Horn, Texas Sector

This report presents the results of cultural resources monitoring and survey activities connected with a Department of Defense (DOD) Joint Task Force Six (JTF-6) project in southern Hudspeth and Culberson, western Jeff Davis, and northern Presidio Counties, Texas. These cultural resource activities were prompted by road improvement activities initiated by the U.S. Border Patrol. The road improvement activities were designed to aid the U.S. Border Patrol in their battle against illegal drug trade and smuggling operations along the U.S.-Mexico border. Geo-Marine, Inc. conducted the survey as part of an indefinite delivery contract with the Fort Worth District of the U.S. Army Corps of Engineers. The survey and monitoring were tailored to focus only on those areas to be disturbed by road repair activities and to identify cultural resource sites which were to be avoided during such activities

Neutron knockout of 12Be populating neutron-unbound states in 11Be

Neutron-unbound resonant states of 11Be were populated in neutron knock-out reactions from 12Be and identified by 10Be-n coincidence measurements. A resonance in the decay-energy spectrum at 80(2) keV was attributed to a highly excited unbound state in 11Be at 3.949(2) MeV decaying to the 2+ excited state in 10Be. A knockout cross section of 15(3) mb was inferred for this 3.949(2) MeV state suggesting a spectroscopic factor near unity for this 0p3/2- level, consistent with the detailed shell model calculations.Comment: 5 pages, 2 figures \pacs{29.38.Db, 29.30.Hs, 24.50.+g, 21.10.Pc, 21.10.Hw, 27.20.+n} \keywords{neutron decay spectroscopy, neutron-unbound states in 11Be

Going Global: The Library as a Critical Player in Internationalizing a University

To support the University of Kentucky’s (UK) strategic plan, UK Libraries created a Director of International Programs (DIP) position in 2010 to plan and manage its international initiatives. In consultation of the UK administration, the DIP identified areas in which the library could make major contributions toward internationalization. The DIP has made significant progress in the areas by participating in the College of Arts and Sciences’ Passport to the World Program. Each year the College celebrates the cultural heritage of a country/region. The DIP and liaison librarians collaborate with faculty from different departments to annotate and showcase relevant materials from the library’s special collections in physical and online exhibits. We also host lectures and movie screenings in which faculty introduce audiences to specific cultural features and practices. Assessment of the events is reported to the Provost’s Office annually. Thanks to positive feedback and faculty recommendations, the library’s involvement in the Passport to the World Program went from peripheral in 2010 to being a major organizer with the appointment of the DIP as a member of the Program’s steering committee in 2013. Meanwhile, the annual library budget for hosting international events jumped from a pittance to $8,000. This poster demonstrates using images and brochures that the library has been a crucial player in executing UK’s internationalization strategy. Liaison librarians have (and will continue to) played a pivotal role in building lasting relationships with various campus constituents to support UK’s strategic goals

Establishing the values for patient engagement (PE) in health-related quality of life (HRQoL) research: an international, multiple-stakeholder perspective

PurposeActive patient engagement is increasingly viewed as essential to ensuring that patient-driven perspectives are considered throughout the research process. However, guidance for patient engagement (PE) in HRQoL research does not exist, the evidence-base for practice is limited, and we know relatively little about underpinning values that can impact on PE practice. This is the first study to explore the values that should underpin PE in contemporary HRQoL research to help inform future good practice guidance. MethodsA modified ‘World Café’ was hosted as a collaborative activity between patient partners, clinicians and researchers: self-nominated conference delegates participated in group discussions to explore values associated with the conduct and consequences of PE. Values were captured via post-it notes and by nominated note-takers. Data were thematically analysed: emergent themes were coded and agreement checked. Association between emergent themes, values and the Public Involvement Impact Assessment Framework were explored. ResultsEighty participants, including 12 patient partners, participated in the 90-min event. Three core values were defined: (1) building relationships; (2) improving research quality and impact; and (3) developing best practice. Participants valued the importance of building genuine, collaborative and deliberative relationships—underpinned by honesty, respect, co-learning and equity—and the impact of effective PE on research quality and relevance. Conclusions An explicit statement of values seeks to align all stakeholders on the purpose, practice and credibility of PE activities. An innovative, flexible and transparent research environment was valued as essential to developing a trustworthy evidence-base with which to underpin future guidance for good PE practice.Peer reviewe

Neutron Correlations in the Decay of the First Excited State of 11Li

The decay of unbound excited 11Li was measured after being populated by a two-proton removal from a 13B beam at 71 MeV/nucleon. Decay energy spectra and Jacobi plots were obtained from measurements of the momentum vectors of the 9Li fragment and neutrons. A resonance at an excitation energy of ∼1.2 MeV was observed. The kinematics of the decay are equally well fit by a simple dineutron-like model or a phase-space model that includes final state interactions. A sequential decay model can be excluded