Sample records for eu commerce
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Transatlantic Regulatory Cooperation: a Possible Role for Congress
2008-11-07
Contemporary German Studies, 2008. 5 Daniel Hamilton and Joseph Quinlan, The Transatlantic Economy 2008”, American Chamber of Commerce -EU and the Center...See the American Chamber of Commerce to the EU(AMCHAMEU) position paper, “Advancing Transatlantic Economic Integration,” October 2007. 22 Comments...presented by the U.S. Chamber of Commerce and Business Europe to the TEC, October 1, 2008. Rationale for Including the Legislatures Despite the NTA
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2007-12-01
Economic issues also formed the subject of a distinguished event organized by the US Chamber of Commerce , Business Europe and the Federation of German...2007, US Chamber of Commerce , Business... Chamber of Commerce , Business Europe and the Federation of German Industries, website of the Federal Chancellor http://www.bundeskanzlerin.de/Content
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Walker, Randy M
Thousands of shipments of radioisotopes developed in the United States (US) are transported domestically and internationally for medical and industrial applications, including to partner laboratories in European Union (EU) countries. Over the past five years, the Environmental Protection Agency (EPA), the Department of Energy (DOE), and Oak Ridge National Laboratory (ORNL) have worked with state regulatory compliance personnel, key private sector shippers and carriers, the Department of Homeland Security (DHS), the Department of Transportation (DOT), the Department of Defense (DoD) and the Nuclear Regulatory Commission (NRC) on Radio Frequency Identification (RFID) tracking and monitoring of medical and industrial radioisotopes inmore » commerce. The EPA Radiological Source Tracking and Monitoring (RadSTraM) project tested, evaluated, and integrated RFID technologies in laboratory settings, and at multiple private-sector shipping and distribution facilities (Perkin Elmer and DHL) using common radioisotopes used in everyday commerce. The RFID tracking was also tested in association with other deployed technologies including radiation detection, chemical/explosives detection, advanced imaging, lasers, and infrared scanning. At the 2007 EU-US Summit, the leaders of the US Department of Commerce (DOC) and EU European Commission (EC) committed to pursue jointly directed Lighthouse Priority Projects. These projects are intended to 'foster cooperation' and 'reduce regulatory burdens' with respect to transatlantic commerce. The Transatlantic Economic Council (TEC) Lighthouse Project on Radio Frequency Identification (RFID) has been directed to 'develop a joint framework for cooperation on identification and development of best practices for Radio Frequency Identification (RFID) technologies.' The RFID Lighthouse Priority Project commits both sides to endeavor to align U.S. and EU regulatory and policy approaches on RFID technologies, including pilot projects in the public sector. The RadSTraM project was specifically cited as a candidate for a RFID Lighthouse Project by the EU/DOC collaboration in meeting their mutual goal of developing a 'joint framework for cooperation on identification and development of best practices for RFID technologies.' Concurrently, the Universal Postal Union (UPU) identified this project as a candidate for radioisotope packages shipped by the postal service between the United State Postal Service (USPS). and European Post Agencies.« less
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Walker, Randy M.; Kopsick, Deborah A.; Gorman, Bryan L.
Background Thousands of shipments of radioisotopes developed in the United States (U.S.) are transported domestically and internationally for medical and industrial applications, including to partner laboratories in European Union (EU) countries. Over the past five years, the Environmental Protection Agency (EPA), the Department of Energy (DOE), and Oak Ridge National Laboratory (ORNL)1 have worked with state first responder personnel, key private sector supply chain stakeholders, the Department of Homeland Security (DHS), the Department of Transportation (DOT), the Department of Defense (DoD) and the Nuclear Regulatory Commission (NRC) on Radio Frequency Identification (RFID) tracking and monitoring of medical, research and industrialmore » radioisotopes in commerce. ORNL was the pioneer of the international radioisotope shipping and production business. Most radioisotopes made and used today were either made or discovered at ORNL. While most of the radioisotopes used in the commercial sector are now produced and sold by the private market, ORNL still leads the world in the production of exotic, high-value and/or sensitive industrial, medical and research isotopes. The ORNL-EPA-DOE Radiological Source Tracking and Monitoring (RadSTraM) project tested, evaluated, and integrated RFID technologies in laboratory settings and at multiple private-sector shipping and distribution facilities (Perkin Elmer and DHL) to track and monitor common radioisotopes used in everyday commerce. The RFID tracking capability was also tested in association with other deployed technologies including radiation detection, chemical/explosives detection, advanced imaging, lasers, and infrared scanning. At the 2007 EU-U.S. Summit, the leaders of the US Department of Commerce (DOC) and EU European Commission (EC) committed to pursue jointly directed Lighthouse Priority Projects. These projects are intended to foster cooperation and reduce regulatory burdens with respect to transatlantic commerce. The Transatlantic Economic Council (TEC) Lighthouse Project on Radio Frequency Identification (RFID) has been directed to develop a joint framework for cooperation on identification and development of best practices for Radio Frequency Identification (RFID) technologies The RFID Lighthouse Priority Project commits both sides to endeavor to align U.S. and EU regulatory and policy approaches on RFID technologies, including pilot projects in the public sector.« less
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U.S.-EU Cooperation Against Terrorism
2014-12-01
Administration continues to support the VWP as a key facilitator of transatlantic commerce and tourism , and rejects calls from some critics to suspend it...were subject to widespread criticism in Europe; these included the U.S.-run detention facility at Guantánamo Bay, Cuba ; U.S. plans to try enemy
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The impact of the European health and safety directives on engineering in higher education
NASA Astrophysics Data System (ADS)
Crisp, Alan Roy
This thesis examines the effect that six sets of Health and Safety legislation introduced in 1993 have had on working practices at the University, particularly within the Engineering Departments. The legislation, collectively known colloquially as "the six pack", had much in common with extant United Kingdom (UK) law but, because it emanated from the European Union (EU), it appears to be viewed in the UK as unduly restrictive and time consuming. Much of the thesis is therefore devoted to examining this suspicion in which the EU and its legislation is held by UK employers and employees. The thesis begins by examining the general background and recent history of the EU, before going on to look in greater detail at the development of Health and Safety legislation in particular. The area of interest is then further narrowed to look at the impact of this legislation on Higher Education Institutions by comparing recent accident statistics with those for industry and commerce. The main outcome of this section is that Higher Education has a similar accident profile by 'type' to industry and commerce and therefore would act in a similar manner when implementing the legislation. It is argued that industry and commerce can benefit from this similarity by emulating two case studies at the University where legislation is applied to some engineering equipment and procedures. These are described in detail and the point is made that safety is an approach that pervades all stages of an engineering process, commencing with the design or ordering of equipment. This is reinforced with the results of a primary survey of purchasing at similar institutions with regards to observance of current safety practices. It is concluded that suspicion of the "six pack" legislation is largely the result of overloading of those people responsible for safety by the arrival of a plethora of legislation all at once. Ironically this overloading appears to have influenced safety officers to pay attention to one part of the legislation at a time rather than take the integrated approach that was intended. This has further increased the workload with much testing and replacement of equipment taking place unnecessarily, as would be realised if all legislation were being applied simultaneously. The usefulness of this thesis therefore lies in showing that an integrated approach to Health and Safety is simply part of an overall integrated approach by the EU to increasing prosperity through responsible, sustainable economic development and is not intended to restrict productivity.
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2000-01-01
Momentum Fluxes. NOAA Atlas NESDIS 8 vol. 3 US Department of Commerce, NOAA, NESDIS, 413 p. Dietrich, G., Kalle , K ., Krauss, K ., Siedler, G., 1980...depth, hydrodynamic model are given below for layers ks1 . . . n with ks1 for the top layer. In places where k is used to index model interfaces, ks0 is...the surface and ksn is the bottom. EU 1 E U u E V u cosuŽ . Ž . k k k k k q q yV u sinuqaV sin2uŽ . k k Et acosu Ef Eu sqmax 0,yv u qmax 0,v u y max 0
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Montfort, Jean-Philippe
2003-04-01
After years of good service, EU legislation on chemicals is currently subject to a major review. This process, initiated by the Council of Ministers at Chester in April 1998, will soon lead to new legislative proposals. In the meantime, a review of the Commission's White Paper on "Strategy for a Future Chemicals Policy," published in February 2001, clearly shows that the regulatory landscape in this area will be significantly reshaped and that a new burden will be imposed on industry to demonstrate that the production and use of chemicals indeed conform to high standards of protection of human health and the environment. In the view of industry, on both sides of the Atlantic, while the objectives of the proposed reform can be supported, the measures proposed in the White Paper to implement these objectives are not properly balanced and will lead to substantial societal and economic drawbacks, unless significant adjustments are made. The purpose of this article is to present the pitfalls and difficulties of the reform as they are perceived by the EU Committee of the American Chamber of Commerce in Brussels, an organization that regroups about 150 European companies of American parentage, belonging to a broad range of European business sectors, including producers and users of chemicals. In view of the transatlantic and cross-business character of its membership, the EU Committee offers a different perspective on the debate.
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Verma, Rajeshwar P; Matthews, Edwin J
2015-03-01
This is part II of an in silico investigation of chemical-induced eye injury that was conducted at FDA's CFSAN. Serious eye damage caused by chemical (eye corrosion) is assessed using the rabbit Draize test, and this endpoint is an essential part of hazard identification and labeling of industrial and consumer products to ensure occupational and consumer safety. There is an urgent need to develop an alternative to the Draize test because EU's 7th amendment to the Cosmetic Directive (EC, 2003; 76/768/EEC) and recast Regulation now bans animal testing on all cosmetic product ingredients and EU's REACH Program limits animal testing for chemicals in commerce. Although in silico methods have been reported for eye irritation (reversible damage), QSARs specific for eye corrosion (irreversible damage) have not been published. This report describes the development of 21 ANN c-QSAR models (QSAR-21) for assessing eye corrosion potential of chemicals using a large and diverse CFSAN data set of 504 chemicals, ADMET Predictor's three sensitivity analyses and ANNE classification functionalities with 20% test set selection from seven different methods. QSAR-21 models were internally and externally validated and exhibited high predictive performance: average statistics for the training, verification, and external test sets of these models were 96/96/94% sensitivity and 91/91/90% specificity. Copyright © 2014 Elsevier Inc. All rights reserved.
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European and German food legislation facing uncommon foodstuffs.
Grabowski, Nils Th; Klein, Günter; López, Antonio Martínez
2013-01-01
In Europe, uncommon foodstuff (UFS, i.e., traditional foods from specific European regions and uncommon ethnic foods from non-EU countries) have been contributing to a diversification of the food supply. E-commerce and specialized retail shops are the main sources for UFS. This article discusses the legal bases for UFS introduction and evaluation. By means of 35 representative UFS, this article analyses the possibilities of trade and veterinary inspection of these products in Germany, comparing European Union and national food legislation with the many idiosyncrasies the UFS presents. Conservatory legislation bans the trade with endangered species (primates, cetaceans, songbirds), but for many other species, this is a complex matter that may ban only subpopulations from trade. Although introduction of legal UFS is regulated (yet complicated), the lack of appropriate definitions, intra-European trade harmonization, and of sufficient scientific knowledge hampers a satisfactory evaluation of many UFSs, for example, reptile meat or terrestrial insects. In these cases, official inspection would only be very basic.
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15 CFR 19.7 - When will Commerce entities compromise a Commerce debt?
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false When will Commerce entities compromise a Commerce debt? 19.7 Section 19.7 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.7 When will Commerce entities compromise...
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15 CFR 19.7 - When will Commerce entities compromise a Commerce debt?
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false When will Commerce entities compromise a Commerce debt? 19.7 Section 19.7 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.7 When will Commerce entities compromise...
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15 CFR 19.7 - When will Commerce entities compromise a Commerce debt?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false When will Commerce entities compromise a Commerce debt? 19.7 Section 19.7 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.7 When will Commerce entities compromise...
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15 CFR 19.7 - When will Commerce entities compromise a Commerce debt?
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false When will Commerce entities compromise a Commerce debt? 19.7 Section 19.7 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.7 When will Commerce entities compromise...
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15 CFR 19.7 - When will Commerce entities compromise a Commerce debt?
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false When will Commerce entities compromise a Commerce debt? 19.7 Section 19.7 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.7 When will Commerce entities compromise...
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15 CFR 19.14 - How will Commerce entities report Commerce debts to credit bureaus?
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How will Commerce entities report Commerce debts to credit bureaus? 19.14 Section 19.14 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.14 How will Commerce entities...
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15 CFR 19.14 - How will Commerce entities report Commerce debts to credit bureaus?
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How will Commerce entities report Commerce debts to credit bureaus? 19.14 Section 19.14 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.14 How will Commerce entities...
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15 CFR 19.14 - How will Commerce entities report Commerce debts to credit bureaus?
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How will Commerce entities report Commerce debts to credit bureaus? 19.14 Section 19.14 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.14 How will Commerce entities...
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15 CFR 19.14 - How will Commerce entities report Commerce debts to credit bureaus?
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How will Commerce entities report Commerce debts to credit bureaus? 19.14 Section 19.14 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.14 How will Commerce entities...
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15 CFR 19.14 - How will Commerce entities report Commerce debts to credit bureaus?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false How will Commerce entities report Commerce debts to credit bureaus? 19.14 Section 19.14 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.14 How will Commerce entities...
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Liu, Xiaoming; Xie, Weijie; Lü, Ying; Feng, Jingchun; Tang, Xinghua; Lin, Jun; Dai, Yuhua; Xie, Yu; Yan, Liushui
2017-11-20
Up to now, orchestrating the coexistence of Eu 2+ and Eu 3+ activators in a single host lattice has been an extremely difficult task, especially for the appearance of the characteristic emission of Eu 2+ and Eu 3+ in order to generate white light. Nevertheless, here we demonstrate a new Eu 2+ /Eu 3+ coactivated SrAl 3 BO 7 nanocrystalline phosphor with abundant and excellent multichannel luminescence properties. A series of Eu 2+ /Eu 3+ coactivated SrAl 3 BO 7 nanocrystalline phosphors were prepared through a Pechini-type sol-gel method followed by a reduction process. With excitation of UV/NUV light, the prepared SrAl 3 BO 7 :Eu 2+ ,Eu 3+ phosphors show not only the characteristic f-f transitions of Eu 3+ ion ( 5 D J → 7 F J,J' , J, J' = 0-3), but also the 5d → 4f transitions of Eu 2+ ion with comparable intensity from 400 to 700 nm in the whole visible spectral region. The luminescence color of the SrAl 3 BO 7 :Eu 2+ ,Eu 3+ phosphor can be tuned from blue, blue-green, white, and orange to orange-red by changing the excitation wavelength, the overall doping concentration of europium ions (Eu 2+ , Eu 3+ ), and the relative ratio of Eu 2+ to Eu 3+ ions to some extent. A single-phase white-light emission has been realized in SrAl 3 BO 7 :Eu 2+ ,Eu 3+ phosphor. The obtained SrAl 3 BO 7 :Eu 2+ ,Eu 3+ phosphor has potential application in the area of NUV white-light-emitting diodes.
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Lalloo, Drushca; Demou, Evangelia; Kiran, Sibel; Cloeren, Marianne; Mendes, René; Macdonald, Ewan B
2016-07-01
The competencies required of occupational physicians (OPs) have been the subject of peer-reviewed research in Europe and individual countries around the world. In the European Union (EU), there has been development of guidance on training and common competencies, but little research has extended beyond this. The aim of this study was to obtain consensus on and identify the common core competencies required of OPs around the world. A modified Delphi study was carried out among representative organisations and networks of OPs in a range of countries around the world. It was conducted in 2 rounds using a questionnaire based on the specialist training syllabus of a number of countries, expert panel reviews and conference discussions. Responses were received from 51 countries around the world, with the majority from Europe (60%; 59%) and North and South America (24%; 32%) in rounds 1 and 2, respectively. General principles of assessment and management of occupational hazards to health and good clinical care were jointly considered most important in ranking when compared with the other topic areas. Assessment of disability and fitness for work, communication skills and legal and ethical issues completed the top five. In both rounds, research methods and teaching and educational supervision were considered least important. This study has established the current priorities among OPs across 51 countries of the common competencies required for occupational health (OH) practice. These findings can serve as a platform for the development of common core competencies/qualifications within specific geographical regions or internationally. This is particularly pertinent with globalisation of commerce and free movement within the EU. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/
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15 CFR 19.15 - How will Commerce entities refer Commerce debts to private collection agencies?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false How will Commerce entities refer Commerce debts to private collection agencies? 19.15 Section 19.15 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.15 How will...
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15 CFR 19.15 - How will Commerce entities refer Commerce debts to private collection agencies?
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How will Commerce entities refer Commerce debts to private collection agencies? 19.15 Section 19.15 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.15 How will...
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15 CFR 19.15 - How will Commerce entities refer Commerce debts to private collection agencies?
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How will Commerce entities refer Commerce debts to private collection agencies? 19.15 Section 19.15 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.15 How will...
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15 CFR 19.15 - How will Commerce entities refer Commerce debts to private collection agencies?
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How will Commerce entities refer Commerce debts to private collection agencies? 19.15 Section 19.15 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.15 How will...
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15 CFR 19.15 - How will Commerce entities refer Commerce debts to private collection agencies?
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How will Commerce entities refer Commerce debts to private collection agencies? 19.15 Section 19.15 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.15 How will...
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15 CFR 19.8 - When will Commerce entities suspend or terminate debt collection on a Commerce debt?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false When will Commerce entities suspend or terminate debt collection on a Commerce debt? 19.8 Section 19.8 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.8 When will...
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15 CFR 19.16 - When will Commerce entities refer Commerce debts to the Department of Justice?
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false When will Commerce entities refer Commerce debts to the Department of Justice? 19.16 Section 19.16 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.16 When will...
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15 CFR 19.11 - How will Commerce entities use tax refund offset to collect a Commerce debt?
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How will Commerce entities use tax refund offset to collect a Commerce debt? 19.11 Section 19.11 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.11 How will...
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15 CFR 19.11 - How will Commerce entities use tax refund offset to collect a Commerce debt?
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How will Commerce entities use tax refund offset to collect a Commerce debt? 19.11 Section 19.11 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.11 How will...
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15 CFR 19.8 - When will Commerce entities suspend or terminate debt collection on a Commerce debt?
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false When will Commerce entities suspend or terminate debt collection on a Commerce debt? 19.8 Section 19.8 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.8 When will...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How will Commerce entities add interest, penalty charges, and administrative costs to a Commerce debt? 19.5 Section 19.5 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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15 CFR 19.11 - How will Commerce entities use tax refund offset to collect a Commerce debt?
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How will Commerce entities use tax refund offset to collect a Commerce debt? 19.11 Section 19.11 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.11 How will...
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15 CFR 19.8 - When will Commerce entities suspend or terminate debt collection on a Commerce debt?
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false When will Commerce entities suspend or terminate debt collection on a Commerce debt? 19.8 Section 19.8 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.8 When will...
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15 CFR 19.8 - When will Commerce entities suspend or terminate debt collection on a Commerce debt?
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false When will Commerce entities suspend or terminate debt collection on a Commerce debt? 19.8 Section 19.8 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.8 When will...
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15 CFR 19.16 - When will Commerce entities refer Commerce debts to the Department of Justice?
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false When will Commerce entities refer Commerce debts to the Department of Justice? 19.16 Section 19.16 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.16 When will...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false How will Commerce entities add interest, penalty charges, and administrative costs to a Commerce debt? 19.5 Section 19.5 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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15 CFR 19.11 - How will Commerce entities use tax refund offset to collect a Commerce debt?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false How will Commerce entities use tax refund offset to collect a Commerce debt? 19.11 Section 19.11 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.11 How will...
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15 CFR 19.8 - When will Commerce entities suspend or terminate debt collection on a Commerce debt?
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false When will Commerce entities suspend or terminate debt collection on a Commerce debt? 19.8 Section 19.8 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.8 When will...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How will Commerce entities add interest, penalty charges, and administrative costs to a Commerce debt? 19.5 Section 19.5 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How will Commerce entities add interest, penalty charges, and administrative costs to a Commerce debt? 19.5 Section 19.5 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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15 CFR 19.11 - How will Commerce entities use tax refund offset to collect a Commerce debt?
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How will Commerce entities use tax refund offset to collect a Commerce debt? 19.11 Section 19.11 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.11 How will...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How will Commerce entities add interest, penalty charges, and administrative costs to a Commerce debt? 19.5 Section 19.5 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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15 CFR 19.16 - When will Commerce entities refer Commerce debts to the Department of Justice?
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false When will Commerce entities refer Commerce debts to the Department of Justice? 19.16 Section 19.16 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.16 When will...
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15 CFR 19.16 - When will Commerce entities refer Commerce debts to the Department of Justice?
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false When will Commerce entities refer Commerce debts to the Department of Justice? 19.16 Section 19.16 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.16 When will...
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15 CFR 19.16 - When will Commerce entities refer Commerce debts to the Department of Justice?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false When will Commerce entities refer Commerce debts to the Department of Justice? 19.16 Section 19.16 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.16 When will...
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15 CFR 19.4 - What notice will Commerce entities send to a debtor when collecting a Commerce debt?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false What notice will Commerce entities send to a debtor when collecting a Commerce debt? 19.4 Section 19.4 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.4...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How will Commerce entities offset a Federal employee's salary to collect a Commerce debt? 19.12 Section 19.12 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.12...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How will Commerce entities offset a Federal employee's salary to collect a Commerce debt? 19.12 Section 19.12 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.12...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How will Commerce entities offset a Federal employee's salary to collect a Commerce debt? 19.12 Section 19.12 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.12...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How will Commerce entities offset a Federal employee's salary to collect a Commerce debt? 19.12 Section 19.12 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.12...
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Control of Eu Luminescence Centers by Codoping of Mg and Si into Eu-Doped GaN
NASA Astrophysics Data System (ADS)
Lee, Dong-gun; Wakamatsu, Ryuta; Koizumi, Atsushi; Terai, Yoshikazu; Fujiwara, Yasufumi
2013-08-01
The effects of Mg and Si codoping on Eu luminescence properties have been investigated in Eu-doped GaN (GaN:Eu). The Mg codoping into GaN:Eu produced novel luminescence centers consisting of Eu and Mg, and increased photoluminescence (PL) intensity in Eu,Mg-codoped GaN (GaN:Eu,Mg). However, this increased PL intensity was quenched by thermal annealing in N2 ambient, which is due to activation of Mg acceptors. In GaN:Eu,Mg codoped additionally with Si (GaN:Eu,Mg,Si), on the other hand, the Eu-Mg centers disappeared, while an additional luminescence center appeared. Furthermore, the additional luminescence center showed no quenching under N2 annealing because Si donors compensated for the Mg acceptors in GaN. Thermal quenching of the luminescence center was also approximately half of that in GaN:Eu. These results indicate that the codoping with additional impurities in GaN:Eu is a powerful technique to control Eu luminescence centers for realization of improved device performance in red light-emitting diodes using GaN:Eu.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Feng, Li; Li, Ying; Wang, Guofeng, E-mail: wanggf75@gmail.com
2015-01-15
Highlights: • Tetragonal phase BaTiO{sub 3}:Eu nanocrystals were successfully synthesized using a hydrothermal method. • Under 398 nm excitation, the emissions from Eu{sup 2+} and Eu{sup 3+} ions were observed. • The emission band of Eu{sup 2+} from BaTiO{sub 3}:Eu was observed to broaden with increasing Eu concentration. - Abstract: Tetragonal phase BaTiO{sub 3}:Eu nanocrystals were successfully synthesized using a hydrothermal method and a subsequent calcination treatment. The structures and morphologies of nanocrystals were characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and scanning electron microscopy. The photoluminescence properties of BaTiO{sub 3}:Eu were investigated in detail. Under 398 nmmore » excitation, the emissions from Eu{sup 2+} and Eu{sup 3+} ions were observed, indicating that Eu{sup 2+} and Eu{sup 3+} ions coexisted in BaTiO{sub 3}:Eu nanocrystals. Especially, the emission band of Eu{sup 2+} from BaTiO{sub 3}:Eu was observed to broaden with increasing Eu concentration. When the Eu concentration was 0.5 mol%, the {sup 5}D{sub 0} → {sup 7}F{sub 0} and {sup 5}D{sub 1} → {sup 7}F{sub 0} emissions were observed. In addition, under 537 nm excitation, the emission intensity increased with increasing Eu concentration.« less
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Kim, Su Yeon; Won, Yu-Ho; Jang, Ho Seong
2015-01-01
LiYF4:Eu nanophosphors with a single tetragonal phase are synthesized, and various strategies to enhance the Eu3+ emission from the nanophosphors are investigated. The optimized Eu3+ concentration is 35 mol%, and the red emission peaks due to the 5D0 →7FJ (J = 1 and 2) transitions of Eu3+ ions are further enhanced by energy transfer from a sensitizer pair of Ce3+ and Tb3+. The triple doping of Ce, Tb, and Eu into the LiYF4 host more effectively enhances the Eu3+ emission than the core/shell strategies of LiYF4:Eu(35%)/LiYF4:Ce(15%), Tb(15%) and LiYF4:Ce(15%), Tb(15%)/LiYF4:Eu(35%) architectures. Efficient energy transfer from Ce3+ to Eu3+ through Tb3+ results in three times higher Eu3+ emission intensity from LiYF4:Ce(15%), Tb(15%), Eu(1%) nanophosphors compared with LiYF4:Eu(35%), which contains the optimized Eu3+ concentration. Owing to the energy transfer of Ce3+ → Tb3+ and Ce3+ → Tb3+ → Eu3+, intense green and red emission peaks are observed from LiYF4:Ce(13%), Tb(14%), Eu(1-5%) (LiYF4:Ce, Tb, Eu) nanophosphors, and the intensity ratio of green to red emission is controlled by adjusting the Eu3+ concentration. With increasing Eu3+ concentration, the LiYF4:Ce, Tb, Eu nanophosphors exhibit multicolor emission from green to orange. In addition, the successful incorporation of LiYF4:Ce, Tb, Eu nanophosphors into polydimethylsiloxane (PDMS) facilitates the preparation of highly transparent nanophosphor-PDMS composites that present excellent multicolor tunability. PMID:25597900
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false Will Commerce entities issue a refund if money is erroneously collected on a Commerce debt? 19.19 Section 19.19 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.19...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false When will Commerce entities allow a debtor to pay a Commerce debt in installments instead of one lump sum? 19.6 Section 19.6 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false When will Commerce entities allow a debtor to pay a Commerce debt in installments instead of one lump sum? 19.6 Section 19.6 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false When will Commerce entities allow a debtor to pay a Commerce debt in installments instead of one lump sum? 19.6 Section 19.6 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false Will Commerce entities issue a refund if money is erroneously collected on a Commerce debt? 19.19 Section 19.19 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.19...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false Will Commerce entities issue a refund if money is erroneously collected on a Commerce debt? 19.19 Section 19.19 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.19...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false Will Commerce entities issue a refund if money is erroneously collected on a Commerce debt? 19.19 Section 19.19 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.19...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false Will Commerce entities issue a refund if money is erroneously collected on a Commerce debt? 19.19 Section 19.19 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.19...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false When will Commerce entities allow a debtor to pay a Commerce debt in installments instead of one lump sum? 19.6 Section 19.6 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce...
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Rezende, Marcos V. dos S., E-mail: mvsrezende@gmail.com; Valerio, Mário E.G.; Jackson, Robert A.
2015-01-15
Highlights: • The effect of different gas atmospheres on the Eu reduction process was studied. • The Eu reduction was monitored analyzing XANES region at the Eu L{sub III}-edge. • Hydrogen reducing agent are the most appropriate gas for Eu{sup 2+} stabilization. • Only a part of the Eu ions can be stabilized in the divalent state. • A model of Eu reduction process is proposed. - Abstract: The effect of different gas atmospheres such as H{sub 2}(g), synthetic air, carbon monoxide (CO) and nitrogen (N{sub 2}) on the Eu{sup 3+} → Eu{sup 2+} reduction process during the synthesis ofmore » Eu-doped BaAl{sub 2}O{sub 4} was studied using synchrotron radiation. The Eu{sup 3+} → Eu{sup 2+} reduction was monitored analyzing XANES region when the sample are excited at the Eu L{sub III}-edge. The results show that the hydrogen reducing agent are the most appropriate gas for Eu{sup 2+} stabilization in BaAl{sub 2}O{sub 4} and that only a part of the Eu ions can be stabilized in the divalent state. A model of Eu reduction process, based on the incorporation of charge compensation defects, is proposed.« less
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false When will Commerce entities transfer a Commerce debt to the Treasury Department's Financial Management Service for collection? 19.9 Section 19.9 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false When will Commerce entities transfer a Commerce debt to the Treasury Department's Financial Management Service for collection? 19.9 Section 19.9 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false When will Commerce entities transfer a Commerce debt to the Treasury Department's Financial Management Service for collection? 19.9 Section 19.9 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false When will Commerce entities transfer a Commerce debt to the Treasury Department's Financial Management Service for collection? 19.9 Section 19.9 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false When will Commerce entities transfer a Commerce debt to the Treasury Department's Financial Management Service for collection? 19.9 Section 19.9 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How will Commerce entities use administrative wage garnishment to collect a Commerce debt from a debtor's wages? 19.13 Section 19.13 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How will Commerce entities use administrative wage garnishment to collect a Commerce debt from a debtor's wages? 19.13 Section 19.13 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How will Commerce entities use administrative wage garnishment to collect a Commerce debt from a debtor's wages? 19.13 Section 19.13 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How will Commerce entities use administrative wage garnishment to collect a Commerce debt from a debtor's wages? 19.13 Section 19.13 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false How will Commerce entities use administrative wage garnishment to collect a Commerce debt from a debtor's wages? 19.13 Section 19.13 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect...
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NASA Astrophysics Data System (ADS)
Dong, Jin; Lin, Baoping
2017-11-01
In this study, on the basis of complex Eu(DBM)3Phen which was widely applied in polymer matrices, quaternary complex Eu(DBM)2Phen(TA) was synthesized by the introduction of 1-tridecanecarboxylic acid (TA). XRD analyses show that Eu(DBM)2Phen(TA) inclines to amorphization compared with Eu(DBM)3Phen which is crystal. Ethylene-vinyl acetate (EVA) film doped with Eu(DBM)2Phen(TA) was prepared by casting method. SEM and AFM analyses show that the compatibility of Eu(DBM)2Phen(TA) with EVA is better than that of Eu(DBM)3Phen with EVA. Under the same addition amount of Eu3+ complexes, visible light transmittance of Eu(DBM)2Phen(TA)/EVA film is obviously greater than that of Eu(DBM)3Phen/EVA film, and the fluorescence intensity of Eu(DBM)2Phen(TA)/EVA film is only slightly lower than that of Eu(DBM)3Phen/EVA film. With the optimum addition amount of Eu3+ complexes, the energy conversion efficiency of the polycrystalline silicon solar cell coated with Eu(DBM)2Phen(TA)/EVA film is improved to 12.14%, and in comparison, that of the solar cell coated with Eu(DBM)3Phen/EVA film is only 11.98%. Hence Eu(DBM)2Phen(TA)/EVA film has a potential prospect as luminescent down-shifting material.
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Szíjjártó, Csongor; Pershagen, Elias; Borbas, K Eszter
2012-07-07
Cu(I)-catalysed azide-alkyne cycloaddition reactions were used to functionalise lanthanide(III)-complexes (Ln; La, Eu and Tb) incorporating alkyne or azide reactive groups. Microwave irradiation significantly accelerated the reactions, enabling full conversion to the triazole products in some cases in 5 min. Alkyl and aryl azides and alkyl and aryl alkynes could all serve as coupling partners. These reaction conditions proved efficient for cyclen-tricarboxylates and previously unreactive cyclen-tris-primary amide chelates. The synthesis of heterobimetallic (Eu/Tb, EuTb17 and Eu/La, EuLa17) and heterotrimetallic (Eu/La/Eu) complexes was achieved in up to 60% isolated yield starting from coumarin 2-appended alkynyl complexes Tb16 or La16 and an azido-Eu complex Eu4, and bis-alkynyl La-complex La5 and Eu4, respectively. EuTb17 displayed dual Eu(III) and Tb(III)-emission upon antenna-centred excitation.
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Geng, Dongling; Shang, Mengmeng; Zhang, Yang; Lian, Hongzhou; Lin, Jun
2013-11-21
Eu(2+) singly and Eu(2+)/Mn(2+) co-doped Na2SrMg(PO4)2 (NSMP) phosphors have been prepared via a high-temperature solid-state reaction process. Upon UV excitation of 260-360 nm, the NSMP:xEu(2+) phosphors exhibit a violet band located at 399 nm and a blue band centered at 445 nm, which originate from Eu(2+) ions occupying two different crystallographic sites: Eu(2+)(I) and Eu(2+)(II), respectively. Excitation wavelengths longer than 380 nm can selectively excite Eu(2+)(II) to emit blue light. Energy transfer processes in the Eu(2+)(I)-Eu(2+)(II) and Eu(2+)-Mn(2+) pairs have been observed and investigated by luminescence spectra and decay curves. The emission color of as-prepared samples can be tuned by changing the relative concentrations of Eu(2+) and Mn(2+) ions and adjusting the excitation wavelength. Under UV excitation of 323 nm, the absolute quantum yield of NSMP:0.005Eu(2+) is 91%, which is higher than most of the other Eu(2+)-doped phosphors reported previously. The temperature dependent luminescence properties and decay curves (4.3-450 K) of NSMP:Eu(2+) and NSMP:Eu(2+), Mn(2+) phosphors have been studied in detail. Thermal quenching of Eu(2+) has been observed while the emission band of Mn(2+) shows a blue-shift and an abnormal increase of intensity with increasing temperature. The unusual thermal quenching behavior indicates that the NSMP compound can serve as a good lattice host for Mn(2+) ions which can be used as a red-emitting phosphor. Additionally, the lifetimes for Eu(2+)(I) and Eu(2+)(II) increase with increasing temperatures.
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Nwe, Kido; Richard, John P; Morrow, Janet R
2007-11-28
The macrocycles 1,4,7-tris(carbamoylmethyl)-1,4,7,10-tetrazacyclododecane (1), 1,4,7-tris[(N-ethyl)carbamoylmethyl]-1,4,7,10-tetraazacyclododecane (2), 1,4,7-tris[(N,N-diethyl)carbamoylmethyl]-1,4,7,10-tetraazacyclododecane (3) and their Eu(III) complexes are prepared. Studies using direct Eu(III) excitation luminescence spectroscopy show that all three Eu(III) complexes exhibit only one predominant isomer with two bound waters under neutral to mildly basic conditions (Eu(X)(H(2)O)(2) for X = 1-3). There are no detectable ligand ionizations over the pH range 5.0-8.0 for Eu(3), 5.0-8.5 for Eu(2) or 5.0-9.5 for Eu(1). The three Eu(III) complexes show a linear dependence of second-order rate constants for the cleavage of 4-nitrophenyl-2-hydroxyethylphosphate (HpPNP) on pH in the range 6.5-8.0 for Eu(3), 7.0-8.5 for Eu(2) and 7.0-9.0 for Eu(1). This pH-rate profile is consistent with the Eu(III) complex-substrate complex being converted to the active form by loss of a proton and with Eu(III) water pK(a) values that are higher than 8.0 for Eu(3), 8.5 for Eu(2) and 9.0 for Eu(1). Inhibition studies show that Eu() binds strongly to the dianionic ligand methylphosphate (K(d) = 0.28 mM), and more weakly to diethylphosphate (K(d) = 7.5 mM), consistent with a catalytic role of the Eu(III) complexes in stabilizing the developing negative charge on the phosphorane transition state.
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2013-01-01
Eu2O3/Si multilayer nanostructured films are deposited on Si substrates by magnetron sputtering. Transmission electron microscopy and X-ray diffraction measurements demonstrate that multicrystalline Eu silicate is homogeneously distributed in the film after high-temperature treatment in N2. The Eu2+ silicate is formed by the reaction of Eu2O3 and Si layers, showing an intense and broad room-temperature photoluminescence peak centered at 610 nm. It is found that the Si layer thickness in nanostructures has great influence on Eu ion optical behavior by forming different Eu silicate crystalline phases. These findings open a promising way to prepare efficient Eu2+ materials for photonic application. PMID:23618344
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15 CFR 9.7 - Department of Commerce energy conservation mark.
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false Department of Commerce energy conservation mark. 9.7 Section 9.7 Commerce and Foreign Trade Office of the Secretary of Commerce PROCEDURES... § 9.7 Department of Commerce energy conservation mark. The Department of Commerce shall develop an...
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15 CFR 9.7 - Department of Commerce energy conservation mark.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false Department of Commerce energy conservation mark. 9.7 Section 9.7 Commerce and Foreign Trade Office of the Secretary of Commerce PROCEDURES... § 9.7 Department of Commerce energy conservation mark. The Department of Commerce shall develop an...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2010 CFR
2015-01-01
... 15 Commerce and Foreign Trade 2 2015-01-01 2015-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. 1...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. 1...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 2 2013-01-01 2013-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. 1...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 2 2011-01-01 2011-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. 1...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 2 2012-01-01 2012-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. 1...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 2 2014-01-01 2014-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. 1...
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Pressure-induced valence change and moderate heavy fermion state in Eu-compounds
NASA Astrophysics Data System (ADS)
Honda, Fuminori; Okauchi, Keigo; Sato, Yoshiki; Nakamura, Ai; Akamine, Hiromu; Ashitomi, Yosuke; Hedo, Masato; Nakama, Takao; Takeuchi, Tetsuya; Valenta, Jaroslav; Prchal, Jiri; Sechovský, Vladimir; Aoki, Dai; Ōnuki, Yoshichika
2018-05-01
A pressure-induced valence transition has attracted much attention in Eu-compounds. Among them, EuRh2Si2, EuNi2Ge2, and EuCo2Ge2 reveal the valence transition around 1, 2, and 3 GPa, respectively. We have succeeded in growing single crystals of EuT2X2 (T: transition metal, X: Si, Ge) and studied electronic properties under pressure. EuRh2Si2 indicates a first-order valence transition between 1 and 2 GPa, with a large and prominent hysteresis in the electrical resistivity. At higher pressures, the first-order valence transition changes to a cross-over regime with an intermediate valence state. Tuning of the valence state with pressure is reflected in a drastic change of the temperature dependence of the electrical resistivity in EuRh2Si2 single crystals. Effect of pressure on the valence states on EuRh2Si2, EuIr2Si2, EuNi2Ge2, and EuCo2Ge2, as well as an isostructural related compound EuGa4, are reviewed.
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Ferromagnetic behavior in mixed valence europium (Eu2+/Eu3+) oxide EuTi1-xMxO3 (M = Al3+ and Ga3+)
NASA Astrophysics Data System (ADS)
Akahoshi, Daisuke; Horie, Hiroki; Sakai, Shingo; Saito, Toshiaki
2013-10-01
We have investigated the Ti-site substitution effect on the magnetic properties of antiferromagnetic insulator EuTiO3 with a Néel temperature of ˜5 K. Partial substitution of Ti4+ with heterovalent Al3+ or Ga3+ turns the corresponding amount of magnetic Eu2+ into non-magnetic Eu3+. Both EuTi1-xAlxO3 (0.05 ≤ x ≤ 0.10) and EuTi1-xGaxO3 (0.05 ≤ x ≤ 0.10) exhibit ferromagnetic (FM) insulating behavior below ˜4 K. The Eu2+/Eu3+ mixed valence state probably contributes to the emergence of the FM behavior. Fine control of the magneto-electric (ME) phases of EuTi1-xAlxO3 and EuTi1-xGaxO3 would lead to intriguing ME phenomena such as giant ME effect.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Tong, Zhi-Fang, E-mail: tongzhifang1998@126.com; Wei, Zhan-Long; Xiao, Cheng
The crystal structure, electronic structure and optical properties of BaSi{sub 2}O{sub 2}N{sub 2}:Eu{sup 2+} with varying Eu doping concentrations are computed by the density functional theory (DFT) and compared with experimental results. The results show that the lattice parameters of primitive cells of Ba{sub 1−x}Si{sub 2}O{sub 2}N{sub 2}:Eu{sub x} become smaller and Eu–N bond length shortens as Eu concentration increases. The band structure of Ba{sub 1−x}Si{sub 2}O{sub 2}N{sub 2}:Eu{sub x} exhibits a direct optical band gap and it's propitious to luminescence. The energy differences from the lowest Eu 5d state to the lowest Eu 4f state decrease with increasing Eumore » concentrations. The analysis of simulative absorption spectra indicates that the electron transition from Eu 4f states to 5d states of both Eu and Ba atoms contributes to the absorption of Ba{sub 1−x}Si{sub 2}O{sub 2}N{sub 2}:Eu{sub x}. Under the coupling effect between Eu and Ba, Ba in BaSi{sub 2}O{sub 2}N{sub 2} exhibits longer wavelength absorption and increases absorption efficiency. The emission wavelength is deduced by measuring energy differences from the lowest Eu 5d state to the lowest Eu 4f state, and the result is in good agreement with experimental value within experimental Eu{sup 2+} doping range. - Graphical abstract: The structure and optical property of BaSi{sub 2}O{sub 2}N{sub 2}:Eu{sup 2+} are computed by DFT and its absorption mechanism is analysed. Results show that absorption peak α is from the host lattice absorption. The absorption peaks β, γ and δ are from Eu 4f to Eu 5d and Ba 6s 5d states. The absorption is attributed to the coupling effect of Eu and Ba atom. - Highlights: • The crystal, electronic structure and optical properties of BaSi{sub 2}O{sub 2}N{sub 2}:Eu{sup 2+} are computed by DFT. • The lattice parameters of primitive cells reduces and Eu–N bond length shortens as Eu{sup 2+} increases. • The energy gap from Eu 5d state to Eu 4f state decrease with increasing Eu concentrations. • Both Eu and Ba atoms contributes to the absorption of Ba{sub 1−x}Si{sub 2}O{sub 2}N{sub 2}:Eu{sub x}. • The deduced emission wavelength is in good agreement with experimental value.« less
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Massue, Julien; Quinn, Susan J; Gunnlaugsson, Thorfinnur
2008-06-04
1.Eu, a cyclen based Eu(III)-thiol conjugate, was incorporated onto the surface of water-soluble gold nanoparticles to give AuNP-1.Eu. The self-assembly between AuNP-1.Eu and the antenna 2 resulted in the formation of the highly luminescent lanthanide system, AuNP-1.Eu-2, at pH 7.4. The sensing of flavin monophosphate 3 is demonstrated, whereby 3 displaced the antenna 2 in AuNP-1.Eu-2, resulting in the formation of AuNP-1.Eu-3 and quenching of the Eu(III) emission.
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How will Commerce entities use administrative offset (offset of non-tax Federal payments) to collect a Commerce debt? 19.10 Section 19.10 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How will Commerce entities use administrative offset (offset of non-tax Federal payments) to collect a Commerce debt? 19.10 Section 19.10 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How will Commerce entities use administrative offset (offset of non-tax Federal payments) to collect a Commerce debt? 19.10 Section 19.10 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How will Commerce entities use administrative offset (offset of non-tax Federal payments) to collect a Commerce debt? 19.10 Section 19.10 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2010 CFR
2017-01-01
... 15 Commerce and Foreign Trade 2 2017-01-01 2017-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. No. 1...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2010 CFR
2016-01-01
... 15 Commerce and Foreign Trade 2 2016-01-01 2016-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. No. 1...
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15 CFR Supplement No. 1 to Part 774 - The Commerce Control List
Code of Federal Regulations, 2010 CFR
2018-01-01
... 15 Commerce and Foreign Trade 2 2018-01-01 2018-01-01 false The Commerce Control List No. Supplement No. 1 to Part 774 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS THE COMMERCE CONTROL LIST Pt. 774, Supp. No. 1...
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15 CFR 19.2 - Why has the Commerce Department issuing these regulations and what do they cover?
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false Why has the Commerce Department issuing these regulations and what do they cover? 19.2 Section 19.2 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION General Provisions § 19.2 Why has the Commerce...
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15 CFR 19.2 - Why has the Commerce Department issuing these regulations and what do they cover?
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false Why has the Commerce Department issuing these regulations and what do they cover? 19.2 Section 19.2 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION General Provisions § 19.2 Why has the Commerce...
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15 CFR 19.2 - Why has the Commerce Department issuing these regulations and what do they cover?
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false Why has the Commerce Department issuing these regulations and what do they cover? 19.2 Section 19.2 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION General Provisions § 19.2 Why has the Commerce...
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15 CFR 19.2 - Why has the Commerce Department issuing these regulations and what do they cover?
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false Why has the Commerce Department issuing these regulations and what do they cover? 19.2 Section 19.2 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION General Provisions § 19.2 Why has the Commerce...
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15 CFR 19.2 - Why has the Commerce Department issuing these regulations and what do they cover?
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false Why has the Commerce Department issuing these regulations and what do they cover? 19.2 Section 19.2 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION General Provisions § 19.2 Why has the Commerce...
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Wiendlocha, Bartlomiej; Kim, SunPhil; Lee, Yeseul
The Eu atoms in Pb 1-xEu xSe have long been assumed to be divalent. We show that p-type doping of this magnetic semiconductor alloy with Na can modify the effective Eu valence: a mixed, Eu 2+–Eu 3+ state appears in Pb 1-x-yEu xNa ySe at particular values of y. Magnetization, carrier concentration, resistivity, and thermopower of Pb 1-x-yEu xNa ySe are reported for a number of samples with different x and y. A pronounced increase in thermopower at a given carrier concentration was identified and attributed to the presence of enhanced ionized impurity scattering. A strong decrease in the holemore » concentration is observed in Pb1-yNaySe when Eu is added to the system, which we attribute to a Eu 2+–Eu 3+ self-ionization process. This is evidenced by magnetization measurements, which reveal a significant reduction of the magnetic moment of Pb 1-xEu xSe upon alloying with Na. Further, a deviation of magnetization from a purely paramagnetic state, described by a Brillouin function, identifies antiferromagnetic interactions between the nearest-neighbor Eu atoms: a value of J ex/k B = -0.35 K was found for the exchange coupling parameter. The conclusion of a Eu 2+–Eu 3+ self-ionization process being in effect is supported further by the electronic structure calculations, which show that an instability of the 4f 7 configuration of the Eu 2+ ion appears with Na doping. In conclusion, schematically, it was found that the Eu 4f levels form states near enough to the Fermi energy that hole doping can lower the Fermi energy and trigger a reconfiguration of a 4f electronic shell.« less
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Wiendlocha, Bartlomiej; Kim, SunPhil; Lee, Yeseul; ...
2017-03-27
The Eu atoms in Pb 1-xEu xSe have long been assumed to be divalent. We show that p-type doping of this magnetic semiconductor alloy with Na can modify the effective Eu valence: a mixed, Eu 2+–Eu 3+ state appears in Pb 1-x-yEu xNa ySe at particular values of y. Magnetization, carrier concentration, resistivity, and thermopower of Pb 1-x-yEu xNa ySe are reported for a number of samples with different x and y. A pronounced increase in thermopower at a given carrier concentration was identified and attributed to the presence of enhanced ionized impurity scattering. A strong decrease in the holemore » concentration is observed in Pb1-yNaySe when Eu is added to the system, which we attribute to a Eu 2+–Eu 3+ self-ionization process. This is evidenced by magnetization measurements, which reveal a significant reduction of the magnetic moment of Pb 1-xEu xSe upon alloying with Na. Further, a deviation of magnetization from a purely paramagnetic state, described by a Brillouin function, identifies antiferromagnetic interactions between the nearest-neighbor Eu atoms: a value of J ex/k B = -0.35 K was found for the exchange coupling parameter. The conclusion of a Eu 2+–Eu 3+ self-ionization process being in effect is supported further by the electronic structure calculations, which show that an instability of the 4f 7 configuration of the Eu 2+ ion appears with Na doping. In conclusion, schematically, it was found that the Eu 4f levels form states near enough to the Fermi energy that hole doping can lower the Fermi energy and trigger a reconfiguration of a 4f electronic shell.« less
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Kao, Danny Tengti
2009-04-01
Mobile commerce (M-commerce) has been acknowledged as one of the most representative transaction types driving e-commerce worldwide; however, the potential security threats that keep consumers from M-commerce still confound the M-commerce industry. This research attempts to explore two questions: What are the dimensions of transaction trust that may significantly affect consumers' intentions to adopt M-commerce, and what are the cultural dimensions that may significantly moderate the impact of transaction trust on consumers' intentions to adopt M-commerce? A research framework based on the BATE model and Hofstede's cultural dimensions was established to identify how transaction trust and cultural value affect consumers' intentions to adopt M-commerce. Results revealed that transaction trust significantly affects consumers' intentions to adopt M-commerce. However, while uncertainty avoidance moderates the impacts of business trust and security on consumers' intentions of M-commerce adoption, both individualism/collectivism and long-term/short-term orientation moderate the relationship between security trust and consumers' intentions of M-commerce adoption.
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Middle and small manufacture enterprise e-commerce application systems research
NASA Astrophysics Data System (ADS)
Zhu, Mingqiang
2017-04-01
With the extensive application of electronic commerce in manufacturing enterprises, e-commerce the influence of operation is increasingly becoming the focus of academic and business circles on the basis, this paper probes into the influence of e-commerce on the operation of the enterprise for the manufacturing enterprises to correctly understand the performance of e-commerce to provide a little help. The article first analyses e-commerce new environment on medium manufacturing enterprise requires, current medium manufacturing enterprise achieved e-commerce has many difficult, should e-commerce correctly awareness, and full planning, and points step implementation, and e-commerce and enterprise integration, and construction features of e-commerce platform, and procurement and supply chain of collaborative management, and attention customer management, and variety e-commerce of mode mixed, and flexible effective operations, and logistics socialization, views, focus on small and medium manufacturing enterprises in e-commerce applications to be innovative in design, production and management of agile and flexible production strategies.
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false When will Commerce entities allow a debtor to pay a Commerce debt in installments instead of one lump sum? 19.6 Section 19.6 Commerce and... provisions of 31 CFR 901.8 and the Commerce entity's policies and procedures. ...
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Shinde, K N; Dhoble, S J
2013-01-01
A series of Ca6AlP5O20 doped with rare earths (Eu and Ce) and co-doped (Eu, Ce and Eu,Mn) were prepared by combustion synthesis. Under Hg-free excitation, Ca6AlP5O20:Eu exhibited Eu(2+) (486 nm) emission in the blue region of the spectrum and under near Hg excitation (245 nm), Ca6AlP5O20:Ce phosphor exhibited Ce(3+) emission (357 nm) in the UV range. Photoluminescence (PL) peak intensity increased in Ca6AlP5O20:Eu,Ce and Ca6AlP5O20:Eu, Mn phosphors due to co-activators of Ce(3+) and Mn(2+) ions. As a result, these ions played an important role in PL emission in the present matrix. Ca6AlP5O20:Eu, Ce and Ca6AlP5O20:Eu, Mn phosphors provided energy transfer mechanisms via Ce(3+) → Eu(2+) and Eu(2+) → Mn(2+), respectively. Eu ions acted as activators and Ce ions acted as sensitizers. Ce emission energy was well matched with Eu excitation energy in the case of Ca6AlP5O20:Eu, Ce and Eu ions acted as activators and Mn ions acted as sensitizers in Ca6AlP5O20:Eu, Mn. This study included synthesis of new and efficient phosphate phosphors. The impact of doping and co-doping on photoluminescence properties and energy transfer mechanisms were investigated and we propose a feasible interpretation. Copyright © 2012 John Wiley & Sons, Ltd.
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The electronic-commerce-oriented virtual merchandise model
NASA Astrophysics Data System (ADS)
Fang, Xiaocui; Lu, Dongming
2004-03-01
Electronic commerce has been the trend of commerce activities. Providing with Virtual Reality interface, electronic commerce has better expressing capacity and interaction means. But most of the applications of virtual reality technology in EC, 3D model is only the appearance description of merchandises. There is almost no information concerned with commerce information and interaction information. This resulted in disjunction of virtual model and commerce information. So we present Electronic Commerce oriented Virtual Merchandise Model (ECVMM), which combined a model with commerce information, interaction information and figure information of virtual merchandise. ECVMM with abundant information provides better support to information obtainment and communication in electronic commerce.
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37 CFR 102.34 - Specific exemptions.
Code of Federal Regulations, 2012 CFR
2012-07-01
.../DEPT-14; (D) Attorneys and Agents Registered to Practice Before the Office—COMMERCE/PAT-TM-1; (E... OF COMMERCE ADMINISTRATION DISCLOSURE OF GOVERNMENT INFORMATION Privacy Act § 102.34 Specific... are within this exemption are: COMMERCE/PAT-TM-6, COMMERCE/PAT-TM-7, COMMERCE/PAT-TM-8, COMMERCE/PAT...
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37 CFR 102.34 - Specific exemptions.
Code of Federal Regulations, 2013 CFR
2013-07-01
.../DEPT-14; (D) Attorneys and Agents Registered to Practice Before the Office—COMMERCE/PAT-TM-1; (E... OF COMMERCE ADMINISTRATION DISCLOSURE OF GOVERNMENT INFORMATION Privacy Act § 102.34 Specific... are within this exemption are: COMMERCE/PAT-TM-6, COMMERCE/PAT-TM-7, COMMERCE/PAT-TM-8, COMMERCE/PAT...
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Horoz, Sabit; Yakami, Baichhabi; Poudyal, Uma; ...
2016-04-27
Eu-doped ZnS quantum dots (QDs) have been synthesized by wet-chemical method and found to form in zinc blende (cubic) structure. Both Eu 2+ and Eu 3+ doped ZnS can be controllably synthesized. The Eu 2+ doped ZnS QDs show broad photoluminescence emission peak around 512 nm, which is from the Eu2+ intra-ion transition of 4f 6d1 – 4f 7, while the Eu 3+ doped samples exhibit narrow emission lines characteristic of transitions between the 4f levels. The investigation of the magnetic properties shows that the Eu 3+ doped samples exhibit signs of ferromagnetism, on the other hand, Eu 2+ dopedmore » samples are paramagnetic of Curie-Weiss type. The incident photon to electron conversion efficiency is increased with the Eu doping, which suggests the QD solar cell efficiency can be enhanced by Eu doping due to widened absorption windows. This is an attractive approach to utilize benign and environmentally friendly wide band gap ZnS QDs in solar cell technology.« less
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Abnormal Eu behavior at formation of H2O- and Cl-bearing fluids during degassing of granite magmas
NASA Astrophysics Data System (ADS)
Lukanin, Oleg
2010-05-01
One of the important features of REE behavior in the process of decompression degassing of granite melts is the presence of europium anomalies in REE spectrum of forming fluid phase. Negative Eu anomaly in REE spectrum of fluids enriched by chlorine that were formed under high pressures at early stages of degassing relative to REE spectrum of granite melts may take place. Negative Eu anomaly in fluid is replaced by positive one with pressure decrease and decline of Cl concentration in fluid [1, 2]. Observable unique features of europium redistribution between fluid and melt find an explanation in such a fact that Eu in contrast to the other REE under oxidation-reduction conditions, being typical for magmatic process, is present in acidic silica-alumina melts in two valency forms Eu3+ and Eu2+ whereas the dominant form for the other REE in such a melts is (REE)3+ [3, 4]. From the analysis of melt-fluid exchange reactions with participation of two valency forms of europium Eu3+ and Eu2+ follows that the total distribution coefficient of Eu between fluid and melt D(Eu)f-m is equal as a first approximation to [5, 6]: D(Eu)f-m = a1α [C(Cl)f]3 + a2 (1 - α)[C(Cl)f]2, where C(Cl)f - the concentration of Cl in fluid, α = Eu3+/(Eu3+ + Eu2+), i.e. fraction of Eu3+ from the general amount of europium in the melt, and, a1anda2- constants that can be approximately estimated from empirical data upon Eu fluid/melt distribution. The equation given allows to estimate the influence of oxidizing condition of europium on sign and size of Eu anomaly, which is expressed by Eu/Eu# ratio, where Eu is real concentration of europium in fluid being in equilibrium with melt with constant Eu3+/(Eu3+ + Eu2+) ratio, and Eu# is possible "virtual" concentration of europium that could be in the same fluid provided that all europium as other REE as well were exclusively present in trivalent form. The sign and size of Eu anomaly in fluid depends upon Cl concentration in fluid and Eu3+/Eu2+ ratio in melt. The abnormal behavior of Eu shows itself the stronger, the lower fO2and, accordingly, the more fraction of Eu2+is present in melt. The work is supported of the Geosciences Department of the Russian Academy of Science (the program 2- 2010) and RFBR (grant 08-05-00022). References [1] Reed M.J., Candela Ph.A., Piccoli Ph.M. Contrib. Mineral. Petrol. 2000. V. 140. P. 251-262. [2] Lukanin O.A., Dernov-Pegarev V.F. Vestnik Otd. Nauk Zemle RAN, No 1(25)'2007 URL: http://www.scgis.ru/russian/cp1251/h_dgggms/1-2007/informbul-1_2007/term-30e.pdf [3] Drake M.J. Geochim. Cosmochim. Acta. 1975. V. 39. P. 55-64. [4] Wilke M. Behrens H. Contrib. Mineral. Petrol. 1999. V. 137. P. 102-114. [5] Lukanin O.A. Vestnik Otd. Nauk o Zemle RAN, No 1(26)'2008. URL: http://www.scgis.ru/russian/cp1251/h_dgggms/1-2008/informbul-1_2008/magm-20e.pdf [6] Lukanin O.A., Dernov-Pegarev V.F. Geochemistry International, 2010 (in press)
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15 CFR Supplement No. 1 to Part 738 - Commerce Country Chart
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 2 2013-01-01 2013-01-01 false Commerce Country Chart No. Supplement No. 1 to Part 738 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS...
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15 CFR Supplement No. 1 to Part 738 - Commerce Country Chart
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 2 2012-01-01 2012-01-01 false Commerce Country Chart No. Supplement No. 1 to Part 738 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS...
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15 CFR Supplement No. 1 to Part 738 - Commerce Country Chart
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 2 2014-01-01 2014-01-01 false Commerce Country Chart No. Supplement No. 1 to Part 738 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS...
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15 CFR Supplement No. 1 to Part 738 - Commerce Country Chart
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 2 2011-01-01 2011-01-01 false Commerce Country Chart No. Supplement No. 1 to Part 738 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS...
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15 CFR 807.2 - Department of Commerce rules applicable.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Department of Commerce rules applicable. 807.2 Section 807.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF ECONOMIC ANALYSIS, DEPARTMENT OF COMMERCE PUBLIC INFORMATION § 807.2 Department of...
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15 CFR 807.2 - Department of Commerce rules applicable.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Department of Commerce rules applicable. 807.2 Section 807.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF ECONOMIC ANALYSIS, DEPARTMENT OF COMMERCE PUBLIC INFORMATION § 807.2 Department of...
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15 CFR 807.2 - Department of Commerce rules applicable.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Department of Commerce rules applicable. 807.2 Section 807.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF ECONOMIC ANALYSIS, DEPARTMENT OF COMMERCE PUBLIC INFORMATION § 807.2 Department of...
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29 CFR 779.239 - Meaning of “engaged in commerce or in the production of goods for commerce.”
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Meaning of âengaged in commerce or in the production of goods for commerce.â 779.239 Section 779.239 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce.” The term “engaged in commerce or in the production of...
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29 CFR 779.239 - Meaning of “engaged in commerce or in the production of goods for commerce.”
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Meaning of âengaged in commerce or in the production of goods for commerce.â 779.239 Section 779.239 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce.” The term “engaged in commerce or in the production of...
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29 CFR 779.239 - Meaning of “engaged in commerce or in the production of goods for commerce.”
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Meaning of âengaged in commerce or in the production of goods for commerce.â 779.239 Section 779.239 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce.” The term “engaged in commerce or in the production of...
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29 CFR 779.239 - Meaning of “engaged in commerce or in the production of goods for commerce.”
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Meaning of âengaged in commerce or in the production of goods for commerce.â 779.239 Section 779.239 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce.” The term “engaged in commerce or in the production of...
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29 CFR 779.239 - Meaning of “engaged in commerce or in the production of goods for commerce.”
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Meaning of âengaged in commerce or in the production of goods for commerce.â 779.239 Section 779.239 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce.” The term “engaged in commerce or in the production of...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false Will a debtor who owes a Commerce or... licenses, permits or privileges? 19.17 Section 19.17 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.17 Will a debtor who owes a...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false Will a debtor who owes a Commerce or... licenses, permits or privileges? 19.17 Section 19.17 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.17 Will a debtor who owes a...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false Will a debtor who owes a Commerce or... licenses, permits or privileges? 19.17 Section 19.17 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.17 Will a debtor who owes a...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false Will a debtor who owes a Commerce or... licenses, permits or privileges? 19.17 Section 19.17 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.17 Will a debtor who owes a...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false Will a debtor who owes a Commerce or... licenses, permits or privileges? 19.17 Section 19.17 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.17 Will a debtor who owes a...
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Effects of Eu doping and O vacancy on the magnetic and optical properties of ZnO
NASA Astrophysics Data System (ADS)
Ling-Feng, Qu; Qing-Yu, Hou; Xiao-Fang, Jia; Zhen-Chao, Xu; Chun-Wang, Zhao
2018-02-01
We calculated the electronic structure and optical properties of Eu mono-doped ZnO systems with or without O vacancy. We also determined the relative energy of ferromagnetic and antiferromagnetic orders of Eu-double-doped ZnO systems. The double-doped systems possess high Curie temperature and achieve room temperature ferromagnetism. The magnetism in the Eu mono-doped system without O vacancy is caused by the -Eu3+-O2--Eu3+- bound magnetopolaron (BMP) model. The magnetism of Eu mono-doped ZnO systems with O vacancy is more stable than that without O vacancy, and such magnetism is attributed to the -Eu3+-VO++-Eu3+- BMP model. The absorption spectrum for mono-doped systems is red shifted, and this finding confirms that Eu-mono-doped ZnO is a candidate photocatalyst for various applications. Therefore, Eu-double-doped ZnO can be practically used as an unambiguous diluted magnetic semiconductor.
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Luminescence and Site Occupancy of Eu2+ in Ba2 Ca(BO3)2
NASA Astrophysics Data System (ADS)
Li, Pan-Lai; Wang, Zhi-Jun; Yang, Zhi-Ping; Guo, Qing-Lin
2011-01-01
A green phosphor Ba2Ca(BO3)2:Eu2+ was synthesized by a high temperature solid-state reaction method under a reductive atmosphere. The luminescence and site occupancy of Eu2+ in Ba2Ca(BO3)2 are investigated. Ba2Ca(BO3)2:Eu2+ shows one green band (537 nm) under 400 nm near ultraviolet excitation which is suitable for UV LED. Ca2+ and Ba2+ ions in Ba2Ca(BO3)2 are replaced by Eu2+ ions, the Ba2Ca(BO3)2:Eu2+ shows a dissymmetrical emission band. The influence of Eu2+ doping concentrations on the emission intensity of Ba2Ca(BO3)2:Eu2+ is studied. It is found that the emission intensity is influenced by the Eu2+ concentration and reaches the maximum value at 2% Eu2+. According to the Dexter theory, the concentration quenching mechanisms of Eu2+ in Ba2Ca(BO3)2 are the d-dinteraction.
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Fano Resonance of Eu2+ and Eu3+ in (Eu,Gd)Te MBE Layers
NASA Astrophysics Data System (ADS)
Orlowski, B. A.; Kowalski, B. J.; Dziawa, P.; Pietrzyk, M.; Mickievicius, S.; Osinniy, V.; Taliashvili, B.; Kowalik, I. A.; Story, T.; Johnson, R. L.
2006-11-01
Resonant photoemission spectroscopy, with application of synchrotron radiation, was used to study the valence band electronic structure of clean surface of (EuGd)Te layers. Fano-type resonant photoemission spectra corresponding to the Eu 4d-4f transition were measured to determine the contribution of 4f electrons of Eu2+ and Eu3+ ions to the valence band. The resonant and antiresonant photon energies of Eu2+ ions were found as equal to 141 V and 132 eV, respectively and for Eu3+ ions were found as equal to 146 eV and 132 eV, respectively. Contribution of Eu2+4f electrons was found at the valence band edge while for Eu3+ it was located in the region between 3.5 eV and 8.5 eV below the valence band edge.
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Zhang, Kexin; Zhang, Rui; Yu, Yaxin; Sun, Shuqing
2012-04-01
In this paper, we report a facile method to synthesize high quality CdS: Eu nanocrystals (NCs) and CdS: Eu/ZnS NCs with strong photoluminescence (PL). The influence of various experimental variables including the concentration of Eu3+ ions, the reaction time and the reaction temperature were investigated systematically. In addition, the PL properties of CdS: Eu NCs exhibited pH sensitive. Under the acid condition, pH value of the CdS: Eu NCs solution played an important role in determining PL emission intensity. However, under the alkaline condition, the obtained CdS: Eu NCs exhibited a tunable PL emission wavelength (from 490 nm to 610 nm) when pH value was adjusted from pH 7 to 10. After coating with ZnS shell, the CdS: Eu/ZnS NCs showed enhanced PL intensity compare with one of the CdS: Eu NCs. The CdS: Eu NCs and CdS: Eu/ZnS NCs were characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). In addition, the biocompatibility of these NCs was measured by hemolytic test, which indicated that CdS: Eu/ZnS NCs were more biocompatible than CdS: Eu NCs at the same conditions. It can be expected that CdS: Eu/ZnS NCs are promising biolabeling materials.
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15 CFR 16.10 - The Department of Commerce Mark.
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false The Department of Commerce Mark. 16.10 Section 16.10 Commerce and Foreign Trade Office of the Secretary of Commerce PROCEDURES FOR A VOLUNTARY CONSUMER PRODUCT INFORMATION LABELING PROGRAM § 16.10 The Department of Commerce Mark. The Department of...
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15 CFR 16.10 - The Department of Commerce Mark.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false The Department of Commerce Mark. 16.10 Section 16.10 Commerce and Foreign Trade Office of the Secretary of Commerce PROCEDURES FOR A VOLUNTARY CONSUMER PRODUCT INFORMATION LABELING PROGRAM § 16.10 The Department of Commerce Mark. The Department of...
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15 CFR 16.10 - The Department of Commerce Mark.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false The Department of Commerce Mark. 16.10 Section 16.10 Commerce and Foreign Trade Office of the Secretary of Commerce PROCEDURES FOR A VOLUNTARY CONSUMER PRODUCT INFORMATION LABELING PROGRAM § 16.10 The Department of Commerce Mark. The Department of...
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15 CFR 16.10 - The Department of Commerce Mark.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false The Department of Commerce Mark. 16.10 Section 16.10 Commerce and Foreign Trade Office of the Secretary of Commerce PROCEDURES FOR A VOLUNTARY CONSUMER PRODUCT INFORMATION LABELING PROGRAM § 16.10 The Department of Commerce Mark. The Department of...
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Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Commerce. 779.12 Section 779.12 Labor Regulations Relating... OR SERVICES General Some Basic Definitions § 779.12 Commerce. Commerce as used in the Act includes interstate and foreign commerce. It is defined in section 3(b) of the Act to mean “trade, commerce...
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Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Commerce. 779.12 Section 779.12 Labor Regulations Relating... OR SERVICES General Some Basic Definitions § 779.12 Commerce. Commerce as used in the Act includes interstate and foreign commerce. It is defined in section 3(b) of the Act to mean “trade, commerce...
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Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Commerce. 779.12 Section 779.12 Labor Regulations Relating... OR SERVICES General Some Basic Definitions § 779.12 Commerce. Commerce as used in the Act includes interstate and foreign commerce. It is defined in section 3(b) of the Act to mean “trade, commerce...
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Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Commerce. 779.12 Section 779.12 Labor Regulations Relating... OR SERVICES General Some Basic Definitions § 779.12 Commerce. Commerce as used in the Act includes interstate and foreign commerce. It is defined in section 3(b) of the Act to mean “trade, commerce...
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15 CFR 16.10 - The Department of Commerce Mark.
Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false The Department of Commerce Mark. 16.10 Section 16.10 Commerce and Foreign Trade Office of the Secretary of Commerce PROCEDURES FOR A VOLUNTARY CONSUMER PRODUCT INFORMATION LABELING PROGRAM § 16.10 The Department of Commerce Mark. The Department of...
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Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Commerce. 779.12 Section 779.12 Labor Regulations Relating... OR SERVICES General Some Basic Definitions § 779.12 Commerce. Commerce as used in the Act includes interstate and foreign commerce. It is defined in section 3(b) of the Act to mean “trade, commerce...
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Europium gallium garnet (Eu3Ga5O12) and Eu3GaO6: Synthesis and material properties
NASA Astrophysics Data System (ADS)
Sawada, Kenji; Nakamura, Toshihiro; Adachi, Sadao
2016-10-01
Eu-Ga-O ternary compounds were synthesized from a mixture of cubic (c-) Eu2O3 and monoclinic Ga2O3 (β-Ga2O3) raw powders using the solid-state reaction method by calcination at Tc = 1200 °C. The structural and optical properties of the Eu-Ga-O ternary compounds were investigated using X-ray diffraction analysis, photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and Raman scattering measurements. Stoichiometric compounds such as cubic Eu3Ga5O12 (EGG) and orthorhombic Eu3GaO6 were synthesized using molar ratios of x = 0.375 and 0.75 [x≡Eu2O3/(Eu2O3 + Ga2O3)], respectively, together with the end-point binary compounds β-Ga2O3 (x = 0) and monoclinic (m-) Eu2O3 (x = 1.0). The structural change from "cubic" to "monoclinic" in Eu2O3 is due to the structural phase transition occurring at Tc ≥ 1050 °C. In principle, the perovskite-type EuGaO3 and monoclinic Eu4Ga2O9 can also be synthesized at x = 0.5 and 0.667, respectively; however, such stoichiometric compounds could not be synthesized in this study. The PL and PLE properties of EGG and Eu3GaO6 were studied in detail. The temperature dependence of the PL spectra was observed through measurements carried out between T = 20 and 300 K and explained using a newly developed model. Raman scattering measurements were also performed on the Eu-Ga-O ternary systems over the entire composition range from x = 0 (β-Ga2O3) to 1.0 (m-Eu2O3).
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Liu, Wen-Quan; Wu, Dan; Chang, Hugejile; Duan, Ru-Xia; Wu, Wen-Jie; Amu, Guleng; Bao, Fu-Quan; Tegus, Ojiyed
2018-01-01
Synthesizing phosphors with high performance is still a necessary work for phosphor-converted white light-emitting diodes (W-LEDs). In this paper, three series of CaAlSiN3:Eu2+ (denoted as CASN:Eu2+) phosphors using Eu2O3, EuN and EuB6 as raw materials respectively are fabricated by under the alloy precursor normal pressure nitridation synthesis condition. We demonstrate that CASN:Eu2+ using nano-EuB6 as raw material shows higher emission intensity than others, which is ascribed to the increment of Eu2+ ionic content entering into the crystal lattice. An improved thermal stability can also be obtained by using nano-EuB6 due to the structurally stable status, which is assigned to the partial substitution of Eu–O (Eu–N) bonds by more covalent Eu–B ones that leads to a higher structural rigidity. In addition, the W-LEDs lamp was fabricated to explore its possible application in W-LEDs based on blue LEDs. Our results indicate that using EuB6 as raw materials can provide an effective way of enhancing the red emission and improving the thermal stability of the CASN:Eu2+ red phosphor. PMID:29370148
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 7 Agriculture 10 2014-01-01 2014-01-01 false Commerce. 1220.103 Section 1220.103 Agriculture... CONSUMER INFORMATION Soybean Promotion and Research Order Definitions § 1220.103 Commerce. The term commerce means interstate, foreign, or intrastate commerce. ...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 7 Agriculture 10 2010-01-01 2010-01-01 false Commerce. 1220.103 Section 1220.103 Agriculture... CONSUMER INFORMATION Soybean Promotion and Research Order Definitions § 1220.103 Commerce. The term commerce means interstate, foreign, or intrastate commerce. ...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 7 Agriculture 10 2013-01-01 2013-01-01 false Commerce. 1220.103 Section 1220.103 Agriculture... CONSUMER INFORMATION Soybean Promotion and Research Order Definitions § 1220.103 Commerce. The term commerce means interstate, foreign, or intrastate commerce. ...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 7 Agriculture 10 2012-01-01 2012-01-01 false Commerce. 1220.103 Section 1220.103 Agriculture... CONSUMER INFORMATION Soybean Promotion and Research Order Definitions § 1220.103 Commerce. The term commerce means interstate, foreign, or intrastate commerce. ...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 7 Agriculture 10 2011-01-01 2011-01-01 false Commerce. 1220.103 Section 1220.103 Agriculture... CONSUMER INFORMATION Soybean Promotion and Research Order Definitions § 1220.103 Commerce. The term commerce means interstate, foreign, or intrastate commerce. ...
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Eu(III) uptake on rectorite in the presence of humic acid: a macroscopic and spectroscopic study.
Chen, Changlun; Yang, Xin; Wei, Juan; Tan, Xiaoli; Wang, Xiangke
2013-03-01
This work contributed to the comprehension of humic acid (HA) effect on Eu(III) uptake to Na-rectorite by batch sorption experiments, model fitting, scanning electron microscopy, powder X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure (EXAFS) spectroscopy. At low pH, the presence of HA enhanced Eu(III) sorption on Na-rectorite, while reduced Eu(III) sorption at high pH. The experimental data of Eu(III) sorption in the absence and presence of HA were simulated by the diffuse-layer model well with the aid of FITEQL 3.2 software. The basal spacing of rectorite became large after Eu(III) and HA sorption on Na-rectorite. Some of Eu(III) ions and HA might be intercalated into the interlayer space of Na-rectorite. EXAFS analysis showed that the R(Eu-O) (the bond distance of Eu and O in the first shell of Eu) and N values (coordination number) of Eu(III)-HA-rectorite system were smaller than those of Eu(III)-rectorite system. Copyright © 2012 Elsevier Inc. All rights reserved.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Horoz, Sabit; Poudyal, Uma; Wang, Wenyong
2016-04-15
Eu-doped ZnS quantum dots (QDs) have been synthesized by wet-chemical method and found to form in zinc blende (cubic) structure. Both Eu{sup 2+} and Eu{sup 3+} doped ZnS can be controllably synthesized. The Eu{sup 2+} doped ZnS QDs show broad photoluminescence emission peak around 512 nm, which is from the Eu{sup 2+} intra-ion transition of 4f{sup 6}d{sup 1} – 4f{sup 7}, while the Eu{sup 3+} doped samples exhibit narrow emission lines characteristic of transitions between the 4f levels. The investigation of the magnetic properties shows that the Eu{sup 3+} doped samples exhibit signs of ferromagnetism, on the other hand, Eu{supmore » 2+} doped samples are paramagnetic of Curie-Weiss type. The incident photon to electron conversion efficiency is increased with the Eu doping, which suggests the QD solar cell efficiency can be enhanced by Eu doping due to widened absorption windows. This is an attractive approach to utilize benign and environmentally friendly wide band gap ZnS QDs in solar cell technology.« less
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NASA Astrophysics Data System (ADS)
Guo, Shaoqiang; Shay, Nikolas; Wang, Yafei; Zhou, Wentao; Zhang, Jinsuo
2017-12-01
The fluoride molten salt such as FLiNaK and FLiBe is one of the coolant candidates for the next generation nuclear reactor concepts, for example, the fluoride salt cooled high temperature reactor (FHR). For mitigating corrosion of structural materials in molten fluoride salt, the redox condition of the salts needs to be monitored and controlled. This study investigates the feasibility of applying the Eu3+/Eu2+ couple for redox control. Cyclic voltammetry measurements of the Eu3+/Eu2+ couple were able to obtain the concentrations ratio of Eu3+/Eu2+ in the melt. Additionally, the formal standard potential of Eu3+/Eu2+ was characterized over the FHR's operating temperatures allowing for the application of the Nernst equation to establish a Eu3+/Eu2+ concentration ratio below 0.05 to prevent corrosion of candidate structural materials. A platinum quasi-reference electrode with potential calibrated by potassium reduction potential is shown as reliable for the redox potential measurement. These results show that the Eu3+/Eu2+ couple is a feasible redox buffering agent to control the redox condition in molten fluoride salts.
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NASA Astrophysics Data System (ADS)
Tang, M.; Erdman, M.; Eldridge, G.; Lee, C. T.
2017-12-01
Arc lavas are generally more oxidized than mid-ocean-ridge basalts, but how arc lavas acquire their oxidized signatures remains poorly understood. Iron oxidation state in melts have been used to suggest that fluids released from subducted slab may oxidize the sub-arc mantle and produce oxidized arc magmas from the source (e.g., Carmichael, 1991; Kelley and Cottrell), but redox-sensitive trace element and Fe isotope signatures of basalts also suggest that oxidation may happen during magma differentiation (e.g., Dauphas et al., 2009; Lee et al., 2005, 2010). One potential problem, however, is that all of these studies, represent indirect constraints on the primary, pre-erupted magma oxidation state. Here, we examine the Eu systematics of primitive, deep-seated (>45-80 km) arc cumulates, which provide the most direct constraint on arc magmas before they rise into the crust. The ratio of Eu2+/Eu3+ is a function of fo2, temperature and composition. Eu2+ is more incompatible than Eu3+ except in plagioclase. Combining Eu partitioning in minerals and experimentally calibrated Eu oxybarometer (Burnham et al., 2015) allows the application of mineral Eu anomalies in constraining magma redox conditions. The cumulates are represented by garnet-bearing pyroxenites from Arizona, USA and are arc cumulates. Because they derive from depths > 60 km, plagioclase was never present during their petrogenesis, hence any Eu anomalies reflect the effects of oxygen fugacity. We find that the most primitive cumulates have negative Eu anomalies in garnet and clinopyroxene (Eu/Eu*<1), despite the fact that depths of differentiation were too high to stabilize plagioclase. We further show that garnet and clinopyroxene Eu/Eu* increases with differentiation (decreasing Mg#), consistent with Eu2+ being more incompatible than Eu3+. Based on the Eu oxybarometer calibrated by Burnham et al. (2015), the Eu deficits in the most primitive cumulate (Mg# = 77) suggest crystallization at Dlogfo2 of FMQ-1, similar to that of mid-ocean-ridge basalts. Crystal fractionation modelling shows that the increasing Eu/Eu* in the evolved cumulates require fo2 to increase by at least 2 log units as the fractionated cumulate Mg# decreases from 77 to 53. These observations suggest that the oxidized nature of arc magmas occurs during intracrustal differentiation.
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Induced spin-polarization of EuS at room temperature in Ni/EuS multilayers
DOE Office of Scientific and Technical Information (OSTI.GOV)
Poulopoulos, P., E-mail: poulop@upatras.gr; Materials Science Department, University of Patras, 26504 Patras; Goschew, A.
2014-03-17
Ni/EuS multilayers with excellent multilayer sequencing are deposited via e-beam evaporation on the native oxide of Si(100) wafers at 4 × 10{sup −9} millibars. The samples have very small surface and interface roughness and show sharp interfaces. Ni layers are nanocrystalline 4–8 nm thick and EuS layers are 2–4 nm thick and are either amorphous or nanocrystalline. Unlike for Co/EuS multilayers, all Eu ions are in divalent (ferromagnetic) state. We show a direct antiferromagnetic coupling between EuS and Ni layers. At room temperature, the EuS layers are spin-polarized due to the proximity of Ni. Therefore, Ni/EuS is a candidate for room-temperature spintronics applications.
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A Eu(II)-Containing Cryptate as a Redox Sensor in Magnetic Resonance Imaging of Living Tissue.
Ekanger, Levi A; Polin, Lisa A; Shen, Yimin; Haacke, E Mark; Martin, Philip D; Allen, Matthew J
2015-11-23
The Eu(II) ion rivals Gd(III) in its ability to enhance contrast in magnetic resonance imaging. However, all reported Eu(II)-based complexes have been studied in vitro largely because the tendency of Eu(II) to oxidize to Eu(III) has been viewed as a major obstacle to in vivo imaging. Herein, we present solid- and solution-phase characterization of a Eu(II)-containing cryptate and the first in vivo use of Eu(II) to provide contrast enhancement. The results indicate that between one and two water molecules are coordinated to the Eu(II) core upon dissolution. We also demonstrate that Eu(II)-based contrast enhancement can be observed for hours in a mouse. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Immobilization of folic acid on Eu3+-doped nanoporous silica spheres.
Tagaya, Motohiro; Ikoma, Toshiyuki; Yoshioka, Tomohiko; Xu, Zhefeng; Tanaka, Junzo
2011-08-07
Folic acid (FA) was immobilized on Eu(3+)-doped nanoporous silica spheres (Eu:NPSs) through mediation of the 3-aminopropyltriethoxysilane adlayer. The ordered nanopores of Eu:NPS were preserved by the immobilization. The FA-immobilized Eu:NPSs showed the characteristic photoluminescence peak due to interactions between the FA molecules and Eu(3+) ions, and highly dispersed stability in phosphate buffered saline.
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75 FR 21602 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2010-04-26
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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75 FR 7234 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2010-02-18
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of Open Meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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75 FR 64699 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2010-10-20
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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77 FR 48968 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2012-08-15
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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75 FR 38779 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2010-07-06
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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76 FR 38638 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2011-07-01
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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77 FR 35941 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2012-06-15
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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76 FR 61672 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2011-10-05
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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78 FR 35260 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2013-06-12
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of Open Meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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78 FR 49260 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2013-08-13
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of Open Meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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76 FR 23796 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2011-04-28
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting. SUMMARY: This notice announces a public meeting of the Commerce Spectrum Management Advisory Committee (Committee). The Committee provides...
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29 CFR 779.22 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.22 Section 779.22 Labor Regulations Relating to Labor (Continued) WAGE AND HOUR... Definitions § 779.22 Enterprise engaged in commerce or in the production of goods for commerce. The portions...
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29 CFR 779.22 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.22 Section 779.22 Labor Regulations Relating to Labor (Continued) WAGE AND HOUR... Definitions § 779.22 Enterprise engaged in commerce or in the production of goods for commerce. The portions...
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29 CFR 779.237 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.237 Section 779.237 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce. Under section 3(s) the “enterprise” to be covered must...
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29 CFR 779.237 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.237 Section 779.237 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce. Under section 3(s) the “enterprise” to be covered must...
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29 CFR 779.22 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.22 Section 779.22 Labor Regulations Relating to Labor (Continued) WAGE AND HOUR... Definitions § 779.22 Enterprise engaged in commerce or in the production of goods for commerce. The portions...
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29 CFR 779.237 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.237 Section 779.237 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce. Under section 3(s) the “enterprise” to be covered must...
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29 CFR 779.237 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.237 Section 779.237 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce. Under section 3(s) the “enterprise” to be covered must...
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29 CFR 779.237 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.237 Section 779.237 Labor Regulations Relating to Labor (Continued) WAGE AND... commerce or in the production of goods for commerce. Under section 3(s) the “enterprise” to be covered must...
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29 CFR 779.22 - Enterprise engaged in commerce or in the production of goods for commerce.
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Enterprise engaged in commerce or in the production of goods for commerce. 779.22 Section 779.22 Labor Regulations Relating to Labor (Continued) WAGE AND HOUR... Definitions § 779.22 Enterprise engaged in commerce or in the production of goods for commerce. The portions...
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Subbarao, Udumula; Roy, Soumyabrata; Sarma, Saurav Ch; Sarkar, Sumanta; Mishra, Vidyanshu; Khulbe, Yatish; Peter, Sebastian C
2016-10-17
Single crystals (SCs) of the compounds Eu 3 Ag 2 In 9 and EuCu 2 Ge 2 were synthesized through the reactions run in liquid indium. Eu 3 Ag 2 In 9 crystallizes in the La 3 Al 11 structure type [orthorhombic space group (SG) Immm] with the lattice parameters: a = 4.8370(1) Å, b = 10.6078(3) Å, and c = 13.9195(4) Å. EuCu 2 Ge 2 crystallizes in the tetragonal ThCr 2 Si 2 structure type (SG I4/mmm) with the lattice parameters: a = b = 4.2218(1) Å, and c = 10.3394(5) Å. The crystal structure of Eu 3 Ag 2 In 9 is comprised of edge-shared hexagonal rings consisting of indium. The one-dimensional chains of In 6 rings are shared through the edges, which are further interconnected with other six-membered rings forming a three-dimensional (3D) stable crystal structure along the bc plane. The crystal structure of EuCu 2 Ge 2 can be explained as the complex [CuGe] (2+δ)- polyanionic network embedded with Eu ions. These polyanionic networks present in the crystal structure of EuCu 2 Ge 2 are shared through the edges of the 011 plane containing Cu and Ge atoms, resulting in a 3D network. The structural relationship between Eu 3 T 2 In 9 and EuCu 2 Ge 2 has been discussed in detail, and we conclude that Eu 3 T 2 In 9 is the metal deficient variant of EuCu 2 Ge 2 . The magnetic susceptibilities of Eu 3 T 2 In 9 (T = Cu and Ag) and EuCu 2 Ge 2 were measured between 2 and 300 K. In all cases, magnetic susceptibility data followed Curie-Weiss law above 150 K. Magnetic moment values obtained from the measurements indicate the probable mixed/intermediate valent behavior of the europium atoms, which was further confirmed by X-ray absorption studies and bond distances around the Eu atoms. Electrical resistivity measurements suggest that Eu 3 T 2 In 9 and EuCu 2 Ge 2 are metallic in nature.
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Adsorption of Eu(III) onto roots of water hyacinth
DOE Office of Scientific and Technical Information (OSTI.GOV)
Kelley, C.; Mielke, R.E.; Dimaquibo, D.
1999-05-01
The water hyacinth (Eichhornia crassipes) has drawn attention as a plant capable of removing pollutants, including toxic metals, from water. The authors are interested in the capacity of the water hyacinth to remediate aquatic environments that have been contaminated with the lanthanide metal, europium Eu(III). Using scanning electron microscopy (SEM) they have been able to determine that Eu(III) is adsorbed onto the surface of the roots from water and that the highest concentration of Eu(III) is on the root hairs. X-ray absorption spectroscopy (XAS) techniques were used to speciate the Eu(III) adsorbed onto the surface of the roots. The XASmore » data for Eu-contaminated water hyacinth roots provides evidence of a Eu-oxygen environment and establishes that Eu(III) is coordinated to 10--11 oxygen atoms at a distance of 2.44 {angstrom}. This likely involves binding of Eu(III) to the root via carboxylate groups and hydration of Eu(III) at the root surface.« less
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Mössbauer effect of 151Eu in europium oxalate and fluorides
NASA Astrophysics Data System (ADS)
Wynter, C. I.; Oliver, F. W.; Davis, Alfred; Spijkerman, J. J.; Stadelmaier, H.; Wolfe, E. A.
1993-04-01
In a short communication [C.I. Wynter et al., Radiochimica Acta 55 (1991) 111.] we reported "relative broadening factors" of europium fluoride (EuF 3), europium oxide (Eu 2O 3), europium oxalate decahydrate (Eu 2(C 2O 4) 3.10H 2O and europium benzoate tetrahydrate Eu(C 6H 5COO) 3.4H 2O. Indications of the "relative broadening factor" of the oxalate compared to the fluoride suggested that the oxalate may indeed be a better host for the 21.6-keV gamma ray transition than the fluoride. In a continuing search for a better host matrix for this Mössbauer transition, we have prepared additionally a systematic series of fluorides, namely. EuF 3, NaEuF 4, Na 3EuF 6, and K 3EuF 6 to measure the linewidths and compute the "true" broadening factor using the natural linewidth of 151Eu as 1.31 {mm}/{s}.
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Effects of X-ray irradiation on the Eu3+ → Eu2+ conversion in CaAl2O4 phosphors
NASA Astrophysics Data System (ADS)
Gomes, Manassés A.; Carvalho, Jéssica C.; Andrade, Adriano B.; Rezende, Marcos V.; Macedo, Zélia S.; Valerio, Mário E. G.
2018-01-01
This paper reports structural and luminescence properties of Eu-doped CaAl2O4 produced by an alternative sol-gel method using coconut water. Results of differential thermal analysis (DTA), thermogravimetric analysis (TGA), and X-ray diffraction (XRD) allowed us to identify the best synthesis conditions for sample preparation. Simultaneous measurements of X-ray absorption spectroscopy (XAS) and X-ray excited optical luminescence (XEOL) were also performed in the X-ray energy range of the Eu LIII edge. Results from photoluminescence (PL) showed only the characteristic Eu3+ emission. However, radioluminescence emission spectra from Eu-doped CaAl2O4 shows a process of conversion of Eu3+ to Eu2+, which is induced by X-ray irradiation and is dependent on the radiation dose energy. X-ray absorption near edge structure (XANES) measurements corroborate Eu reduction due to irradiation, showing that only the Eu3+ ion is present in stable form in the CaAl2O4.
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Ternary complex formation of Eu(III) with o-phthalate in aqueous solutions.
Park, K K; Jung, E C; Cho, H-R; Kim, W H
2009-08-15
Ternary hydroxo complex formation of Eu(III) with o-phthalate was investigated by potentiometry and fluorescence spectrophotometry. Curves of the equilibrium pH versus the amount of NaOH added showed that the pH value starting to form a Eu(III) precipitate was decreased due to the formation of a ternary hydroxo complex, EuOHL(s) (L = phthalate). The formation of EuOHL(s) was qualitatively confirmed by the enhancement of the fluorescence intensity of Eu(III) in the precipitate with the light absorbed by phthalate, and was quantitatively confirmed by the measurement of the amounts of Eu(III), OH(-) and phthalate included in the precipitate. The solubility product of EuOHL(s) was determined as pK(sp)(0) = 15.6+/-0.4. Characteristic features in the fluorescence spectra and the solubility product of the Eu(III)-phthalate complex were compared with those of the Eu(III)-PDA (PDA = pyridine-2,6-dicarboxylate) complex. The fluorescence intensity of the EuL(+) complex of L = PDA was about 11 times stronger than that of L = phthalate. The origin of the difference in the fluorescence intensity is discussed based on the intramolecular energy transfer effect from the lowest triplet energy level of the ligand to the resonance energy level of Eu(III).
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Spectroelectrochemistry and Electrochemistry of Europium Ions in Alkali Chloride Melts
NASA Astrophysics Data System (ADS)
Uehara, Akihiro; Shirai, Osamu; Nagai, Takayuki; Fujii, Toshiyuki; Yamana, Hajimu
2007-04-01
In order to investigate the redox equilibrium of europium ions in molten NaCl-2CsCl, UV-Vis absorption spectrophotometry measurements were performed for Eu2+ and Eu3+ in molten NaCl- 2CsCl at 923 K under simultaneous electrolytic control of their ratio. Molar absorptivities of EuCl3 and EuCl2 in NaCl-2CsCl at 923 K were determined to be (420±21) M -1cm-1 at 31200 cm-1 and (1130±56) M-1cm-1 at 30300 cm-1, respectively. The formal redox potential of the Eu2+/Eu3+ couple in NaCl-2CsCl melt at 923 K was determined to be (-0.941 ±0.004) V vs. Cl2/Cl- by electromotive force measurements on varying concentration ratios of Eu2+ and Eu3+, which were performed using a technique based on the combination of electrolysis and spectrophotometry. Cyclic voltammetry was also carried out in order to examine the characteristics of the voltammograms for the Eu2+/Eu3+ couple in NaCl-2CsCl melt. The formal redox potential of the Eu2+/Eu3+ couple determined by a spectroelectrochemical method agreed with that determined by cyclic voltammetry [(-0.946±0.008) V vs. Cl2/Cl-]. The effects of temperature on the redox potential of the Eu2+/Eu3+ couple in NaCl-2CsCl, NaCl-KCl, LiCl-KCl, and CsCl melts were studied by cyclic voltammetry in the range from 923 to 1123 K.
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Comparative adsorption of Eu(III) and Am(III) on TPD.
Fan, Q H; Zhao, X L; Ma, X X; Yang, Y B; Wu, W S; Zheng, G D; Wang, D L
2015-09-01
Comparative adsorption behaviors of Eu(III) and Am(III) on thorium phosphate diphosphate (TPD), i.e., Th4(PO4)4P2O7, have been studied using a batch approach and surface complexation model (SCM) in this study. The results showed that Eu(III) and Am(III) adsorption increased to a large extent with the increase in TPD dose. Strong pH-dependence was observed in both Eu(III) and Am(III) adsorption processes, suggesting that inner-sphere complexes (ISCs) were possibly responsible for the adsorption of Eu(III) and Am(III). Meanwhile, the adsorption of Eu(III) and Am(III) decreased to a different extent with the increase in ion strength, which was possibly related to outer-sphere complexes and/or ion exchange. In the presence of fulvic acid (FA), the adsorption of Eu(III) and Am(III) showed high enhancement mainly due to the ternary surface complexes of TPD-FA-Eu(3+) and TPD-FA-Am(3+). The SCM showed that one ion exchange (≡S3Am/Eu) and two ISCs (≡(XO)2Am/EuNO3 and ≡(YO)2Am/EuNO3) seemed more reasonable to quantitatively describe the adsorption edges of both Eu(III) and Am(III). Our findings obviously showed that Eu(III) could be a good analogue to study actinide behaviors in practical terms. However, it should be kept in mind that there are still obvious differences between the characteristics of Eu(III) and Am(III) in some special cases, for instance, the complex ability with organic matter and adsorption affinity to a solid surface.
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78 FR 60860 - Commerce Spectrum Management Advisory Committee, Call for Applications
Federal Register 2010, 2011, 2012, 2013, 2014
2013-10-02
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Information Administration, U.S. Department of Commerce. ACTION: Notice and call for applications to serve on... seeking applications from persons interested in serving on the Department of Commerce Spectrum Management...
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76 FR 27636 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2011-05-12
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce... Administration, U.S. Department of Commerce. ACTION: Notice of open meeting, room location change. SUMMARY: This notice announces a change in the room location of a public meeting of the Commerce Spectrum Management...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 2 2011-01-01 2011-01-01 false Introduction. 738.1 Section 738.1 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS COMMERCE CONTROL LIST...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 2 2013-01-01 2013-01-01 false Introduction. 738.1 Section 738.1 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS COMMERCE CONTROL LIST...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 2 2014-01-01 2014-01-01 false Introduction. 738.1 Section 738.1 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS COMMERCE CONTROL LIST...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 2 2012-01-01 2012-01-01 false Introduction. 738.1 Section 738.1 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS COMMERCE CONTROL LIST...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false Introduction. 738.1 Section 738.1 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) BUREAU OF INDUSTRY AND SECURITY, DEPARTMENT OF COMMERCE EXPORT ADMINISTRATION REGULATIONS COMMERCE CONTROL LIST...
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78 FR 64196 - Privacy Act Altered System of Records
Federal Register 2010, 2011, 2012, 2013, 2014
2013-10-28
... DEPARTMENT OF COMMERCE [Docket No. 130730666-3877-02] Privacy Act Altered System of Records AGENCY: Department of Commerce. ACTION: Notice; Commerce/Department-20, Biographical Files. SUMMARY: The Department of Commerce (Commerce) publishes this notice to announce the effective date of a Privacy Act System...
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Analysis of Spatial Pattern and Influencing Factors of E-Commerce
NASA Astrophysics Data System (ADS)
Zhang, Y.; Chen, J.; Zhang, S.
2017-09-01
This paper aims to study the relationship between e-commerce development and geographical characteristics using data of e-commerce, economy, Internet, express delivery and population from 2011 to 2015. Moran's I model and GWR model are applied to analyze the spatial pattern of E-commerce and its influencing factors. There is a growth trend of e-commerce from west to east, and it is obvious to see that e-commerce development has a space-time clustering, especially around the Yangtze River delta. The comprehensive factors caculated through PCA are described as fundamental social productivity, resident living standard and population sex structure. The first two factors have positive correlation with e-commerce, and the intensity of effect increases yearly. However, the influence of population sex structure on the E-commerce development is not significant. Our results suggest that the clustering of e-commerce has a downward trend and the impact of driving factors on e-commerce is observably distinct from year to year in space.
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NASA Astrophysics Data System (ADS)
Bai, Jinyuan; Gu, Huiquan; Hou, Yanjun; Wang, Shuhong
2018-05-01
Two series of bis-β-diketonate Eu3+ complex/polymer hybrid fibers, namely, Eu2(BTP)3(H2O)4/PMMA (Eu/PMMA) and Eu2(BTP)3(H2O)4/PVP (Eu/PVP) have been prepared by electrospinning technology (BTP = 1,3-bis(4,4,4-trifluoro-1,3-dioxobutyl)phenyl, PVP = poly (vinyl pyrrolidone) and PMMA = poly (methyl methacrylate)). The effect of complex Eu2(BTP)3(H2O)4 on the luminescence, thermal stability and morphology of composite fibers were studied by characterization techniques. The Judd-Ofelt theory was applied to this study for explaining the effect of the distribution of Eu2(BTP)3(H2O)4 and the mutual effect of the Eu2(BTP)3(H2O)4 coordination compound and neighboring chain segments of PMMA and PVP polymer matrix.
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Chemistry of the Apollo 11 highland component
NASA Technical Reports Server (NTRS)
Laul, J. C.; Papike, J. J.; Simon, S. B.; Shearer, C. K.
1983-01-01
Thirty-eight Apollo 11 lunar highland fragments from coarse fines 10085 have been subjected to petrologic and chemical study. Six major chemical groups are identified: (a) high-K KREEP; (b) anorthosite with a 10X chondrite positive Eu anomaly and anorthosite with 30X positive Eu anomaly; (c) ANT; (d) LKFM; (e) anorthositic gabbro with no Eu anomaly, with a positive Eu anomaly, and with a negative Eu anomaly; and (f) dominant Highland component, 2X-10X chondrite with a positive 10X-14X Eu anomaly. Newly recognized groups are presented based on the REE patterns: (a) ANT group with 5X La and a 22X positive Eu anomaly; (b) 10X flat with 14X positive Eu anomaly; and (c) 2-3X flat with a 10X positive Eu anomaly. The highland suite is very low in K and REE, and is overall quite similar to the Apollo 16 suite.
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Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2 -xSex system
NASA Astrophysics Data System (ADS)
Mizuguchi, Y.; Paris, E.; Wakita, T.; Jinno, G.; Puri, A.; Terashima, K.; Joseph, B.; Miura, O.; Yokoya, T.; Saini, N. L.
2017-02-01
We have studied the effect of Se substitution on Eu valence in a layered Eu0.5La0.5FBiS2 -xSex superconductor using a combined analysis of x-ray absorption near-edge structure (XANES) and x-ray photoelectron spectroscopy (XPS) measurements. Eu L3-edge XANES spectra reveal that Eu is in the mixed valence state with coexisting Eu2 + and Eu3 +. The average Eu valence decreases sharply from ˜2.3 for x =0.0 to ˜2.1 for x =0.4 . Consistently, Eu 3 d XPS shows a clear decrease in the average valence by Se substitution. Bi 4 f XPS indicates that effective charge carriers in the BiCh2 (Ch = S, Se) layers are slightly increased by Se substitution. On the basis of the present results it has been discussed that the metallic character induced by Se substitution in Eu0.5La0.5FBiS2 -xSex is likely to be due to increased in-plane orbital overlap driven by reduced in-plane disorder that affects the carrier mobility.
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Chen, Zhen; Pan, Yuexiao; Xi, Luqing; Pang, Ran; Huang, Shaoming; Liu, Guokui
2016-11-07
In most Eu 3+ activated phosphors, only red luminescence from the 5 D 0 is obtainable, and efficiency is limited by concentration quenching. Herein we report a new phosphor of Ca 4 LaO(BO 3 ) 3 :Eu 3+ (CLBO:Eu) with advanced photoluminescence properties. The yellow luminescence emitted from the 5 D 1,2 states is not thermally quenched at room temperature. The relative intensities of the yellow and red emission bands depend strongly on the Eu 3+ doping concentration. More importantly, concentration quenching of Eu 3+ photoluminescence is absent in this phosphor, and the stoichiometric compound of Ca 4 EuO(BO 3 ) 3 emits stronger luminescence than the Eu 3+ doped compounds of CLBO:Eu; it is three times stronger than that of a commercial red phosphor of Y 2 O 3 :Eu 3+ . Another beneficial phenomenon is that ligand-to-metal charge transfer (CT) transitions occur in the long UV region with the lowest charge transfer band (CTB) stretched down to about 3.67 eV (∼330 nm). The CT transitions significantly enhance Eu 3+ excitation, and thus result in stronger photoluminescence and promote trapping of excitons for persistent afterglow emission. Along with structure characterization, optical spectra and luminescence dynamics measured under various conditions as a function of Eu 3+ doping, temperature, and excitation wavelength are analyzed for a fundamental understanding of electronic interactions and for potential applications.
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15 CFR 19.4 - What notice will Commerce entities send to a debtor when collecting a Commerce debt?
Code of Federal Regulations, 2012 CFR
2012-01-01
... the Commerce entity intends to garnish the debtor's private sector (i.e., non-Federal) wages (see § 19.... 3201(e); 31 U.S.C. 3720B, 31 CFR 285.13, and § 19.17(a) of this Part); (16) If applicable, the Commerce... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false What notice will Commerce entities...
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Code of Federal Regulations, 2011 CFR
2011-01-01
...) of this section. (e) Request for hearing official. A Commerce entity will provide a hearing official... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false What does a Commerce entity do upon receipt of a request to offset the salary of a Commerce entity employee to collect a debt owed by the...
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Code of Federal Regulations, 2014 CFR
2014-01-01
...) of this section. (e) Request for hearing official. A Commerce entity will provide a hearing official... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false What does a Commerce entity do upon receipt of a request to offset the salary of a Commerce entity employee to collect a debt owed by the...
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Code of Federal Regulations, 2012 CFR
2012-01-01
...) of this section. (e) Request for hearing official. A Commerce entity will provide a hearing official... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false What does a Commerce entity do upon receipt of a request to offset the salary of a Commerce entity employee to collect a debt owed by the...
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Code of Federal Regulations, 2010 CFR
2010-01-01
...) of this section. (e) Request for hearing official. A Commerce entity will provide a hearing official... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false What does a Commerce entity do upon receipt of a request to offset the salary of a Commerce entity employee to collect a debt owed by the...
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15 CFR 19.4 - What notice will Commerce entities send to a debtor when collecting a Commerce debt?
Code of Federal Regulations, 2014 CFR
2014-01-01
... the Commerce entity intends to garnish the debtor's private sector (i.e., non-Federal) wages (see § 19.... 3201(e); 31 U.S.C. 3720B, 31 CFR 285.13, and § 19.17(a) of this Part); (16) If applicable, the Commerce... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false What notice will Commerce entities...
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15 CFR 19.4 - What notice will Commerce entities send to a debtor when collecting a Commerce debt?
Code of Federal Regulations, 2011 CFR
2011-01-01
... the Commerce entity intends to garnish the debtor's private sector (i.e., non-Federal) wages (see § 19.... 3201(e); 31 U.S.C. 3720B, 31 CFR 285.13, and § 19.17(a) of this Part); (16) If applicable, the Commerce... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false What notice will Commerce entities...
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15 CFR 19.4 - What notice will Commerce entities send to a debtor when collecting a Commerce debt?
Code of Federal Regulations, 2013 CFR
2013-01-01
... the Commerce entity intends to garnish the debtor's private sector (i.e., non-Federal) wages (see § 19.... 3201(e); 31 U.S.C. 3720B, 31 CFR 285.13, and § 19.17(a) of this Part); (16) If applicable, the Commerce... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false What notice will Commerce entities...
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Code of Federal Regulations, 2013 CFR
2013-01-01
...) of this section. (e) Request for hearing official. A Commerce entity will provide a hearing official... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false What does a Commerce entity do upon receipt of a request to offset the salary of a Commerce entity employee to collect a debt owed by the...
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Event-related potentials elicited by social commerce and electronic-commerce reviews.
Bai, Yan; Yao, Zhong; Cong, Fengyu; Zhang, Linlin
2015-12-01
There is an increasing interest regarding the use of electroencephalography (EEG) in social commerce and electronic commerce (e-commerce) research. There are several reviews in the field of social commerce or e-commerce; these have great potential value and mining them is fundamental and significant. To our knowledge, EEG is rarely applied to study these. In this study, we examined the neural correlates of social commerce reviews (SCRs) and e-commerce reviews (ECRs) by using them as stimuli to evoke event-related potentials. All SCRs were from friends through a social media platform, whereas ECRs were from strangers through an e-commerce platform. The experimental design was similar to that of a priming paradigm, and included 40 pairs of stimuli consisting of product information (prime stimulus) and reviews (target stimulus). The results showed that the P300 component was successfully evoked by SCR and ECR stimuli. Moreover, the P300 components elicited by SCRs had higher amplitudes than those elicited by ECRs. These findings indicate that participants paid more attention to SCRs than to ECRs. In addition, the associations between neural responses and reviews in social commerce have the potential to assist companies in studying consumer behaviors, thus permitting them to enhance their social commerce strategies.
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5 CFR 5001.103 - Impartiality determinations for members of the Interstate Commerce Commission.
Code of Federal Regulations, 2010 CFR
2010-01-01
... of the Interstate Commerce Commission. 5001.103 Section 5001.103 Administrative Personnel INTERSTATE COMMERCE COMMISSION SUPPLEMENTAL STANDARDS OF ETHICAL CONDUCT FOR EMPLOYEES OF THE INTERSTATE COMMERCE COMMISSION § 5001.103 Impartiality determinations for members of the Interstate Commerce Commission. A member...
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Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 2 2014-07-01 2014-07-01 false Commerce. 401.1 Section 401.1 Labor Regulations Relating to Labor OFFICE OF LABOR-MANAGEMENT STANDARDS, DEPARTMENT OF LABOR LABOR-MANAGEMENT STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.1 Commerce. Commerce means trade, traffic, commerce, transportation...
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Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 2 2010-07-01 2010-07-01 false Commerce. 401.1 Section 401.1 Labor Regulations Relating to Labor OFFICE OF LABOR-MANAGEMENT STANDARDS, DEPARTMENT OF LABOR LABOR-MANAGEMENT STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.1 Commerce. Commerce means trade, traffic, commerce, transportation...
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5 CFR 5001.103 - Impartiality determinations for members of the Interstate Commerce Commission.
Code of Federal Regulations, 2012 CFR
2012-01-01
... of the Interstate Commerce Commission. 5001.103 Section 5001.103 Administrative Personnel INTERSTATE COMMERCE COMMISSION SUPPLEMENTAL STANDARDS OF ETHICAL CONDUCT FOR EMPLOYEES OF THE INTERSTATE COMMERCE COMMISSION § 5001.103 Impartiality determinations for members of the Interstate Commerce Commission. A member...
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Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 2 2013-07-01 2013-07-01 false Commerce. 401.1 Section 401.1 Labor Regulations Relating to Labor OFFICE OF LABOR-MANAGEMENT STANDARDS, DEPARTMENT OF LABOR LABOR-MANAGEMENT STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.1 Commerce. Commerce means trade, traffic, commerce, transportation...
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5 CFR 5001.103 - Impartiality determinations for members of the Interstate Commerce Commission.
Code of Federal Regulations, 2014 CFR
2014-01-01
... of the Interstate Commerce Commission. 5001.103 Section 5001.103 Administrative Personnel INTERSTATE COMMERCE COMMISSION SUPPLEMENTAL STANDARDS OF ETHICAL CONDUCT FOR EMPLOYEES OF THE INTERSTATE COMMERCE COMMISSION § 5001.103 Impartiality determinations for members of the Interstate Commerce Commission. A member...
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Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 2 2012-07-01 2012-07-01 false Commerce. 401.1 Section 401.1 Labor Regulations Relating to Labor OFFICE OF LABOR-MANAGEMENT STANDARDS, DEPARTMENT OF LABOR LABOR-MANAGEMENT STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.1 Commerce. Commerce means trade, traffic, commerce, transportation...
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5 CFR 5001.103 - Impartiality determinations for members of the Interstate Commerce Commission.
Code of Federal Regulations, 2011 CFR
2011-01-01
... of the Interstate Commerce Commission. 5001.103 Section 5001.103 Administrative Personnel INTERSTATE COMMERCE COMMISSION SUPPLEMENTAL STANDARDS OF ETHICAL CONDUCT FOR EMPLOYEES OF THE INTERSTATE COMMERCE COMMISSION § 5001.103 Impartiality determinations for members of the Interstate Commerce Commission. A member...
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Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 2 2011-07-01 2011-07-01 false Commerce. 401.1 Section 401.1 Labor Regulations Relating to Labor OFFICE OF LABOR-MANAGEMENT STANDARDS, DEPARTMENT OF LABOR LABOR-MANAGEMENT STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.1 Commerce. Commerce means trade, traffic, commerce, transportation...
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5 CFR 5001.103 - Impartiality determinations for members of the Interstate Commerce Commission.
Code of Federal Regulations, 2013 CFR
2013-01-01
... of the Interstate Commerce Commission. 5001.103 Section 5001.103 Administrative Personnel INTERSTATE COMMERCE COMMISSION SUPPLEMENTAL STANDARDS OF ETHICAL CONDUCT FOR EMPLOYEES OF THE INTERSTATE COMMERCE COMMISSION § 5001.103 Impartiality determinations for members of the Interstate Commerce Commission. A member...
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75 FR 44759 - Department of Commerce Business Forum
Federal Register 2010, 2011, 2012, 2013, 2014
2010-07-29
... DEPARTMENT OF COMMERCE Department of Commerce Business Forum AGENCY: U.S. Department of Commerce... Commerce (DOC) is seeking vendors that currently conduct business with, or have previously conducted business with or hope to conduct business with DOC. Interested parties are asked to offer comments on the...
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Steinberg, Simon; Card, Nathan; Mudring, Anja -Verena
2015-08-13
The ternary Eu(Au/In) 2 (EuAu 0.46In 1.54 (2)) (I), EuAu 4(Au/In) 2 (EuAu 4+xIn 2–x with x = 0.75(2) (II), 0.93(2), and 1.03(2)), and Eu 5Au 16(Au/In) 6 (Eu 5Au 17.29In 4.71(3)) (III) have been synthesized, and their structures were characterized by single-crystal X-ray diffraction. I and II crystallize with the CeCu 2-type (Pearson Symbol oI12; Imma; Z = 4; a = 4.9018(4) Å; b = 7.8237(5) Å; c = 8.4457(5) Å) and the YbAl 4Mo 2-type (tI14; I4/ mmm; Z = 2; a = 7.1612(7) Å; c = 5.5268(7) Å) and exhibit significant Au/In disorder. I is composed ofmore » an Au/In-mixed diamond-related host lattice encapsulating Eu atoms, while the structure of II features ribbons of distorted, squared Au 8 prisms enclosing Eu, Au, and In atoms. Combination of these structural motifs leads to a new structure type as observed for Eu 5Au 16(Au/In) 6 (Eu 5Au 17.29In 4.71(3)) (oS108; Cmcm; Z = 4; a = 7.2283(4) Å; b = 9.0499(6) Å; c = 34.619(2) Å), which formally represents a one-dimensional intergrowth of the series EuAu 2–“EuAu 4In 2”. The site preferences of the disordered Au/In positions in II were investigated for different hypothetical “EuAu 4(Au/In) 2” models using the projector-augmented wave method and indicate that these structures attempt to optimize the frequencies of the heteroatomic Au–In contacts. Furthermore, a chemical bonding analysis on two “EuAu 5In” and “EuAu 4In 2” models employed the TB-LMTO-ASA method and reveals that the subtle interplay between the local atomic environments and the bond energies determines the structural and site preferences for these systems.« less
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Zhang, Wei; College of Life Science, Dalian Nationalities University, Dalian, Liaoning 116600; Hua, Ruinian, E-mail: rnhua@dlnu.edu.cn
2014-12-15
Graphical abstract: Rice-shaped BaAlF{sub 5}:Eu{sup 2+} nanophosphors were synthesized via one-pot hydrothermal process. The as-prepared BaAlF{sub 5}:Eu{sup 2+} are composed of many particles with an average diameter of 40 nm. When excited at 260 nm, the sharp line emission located at 361 nm of Eu{sup 2+} was observed. The optimum doping concentration of Eu{sup 2+} was confirmed to be 5 mol%. The strong ultraviolet emission of Eu{sup 2+} ions in BaAlF{sub 5}:Eu{sup 2+} nanoparticles suggests that these nanoparticles may have potential applications for sensing, solid-state lasers and spectrometer calibration. - Highlights: • BaAlF{sub 5}:Eu{sup 2+} nanophosphors were synthesized via amore » mild hydrothermal process. • The Van and Huang models were used to research the mechanism of concentration quenching. • The optimum doping concentration of Eu2+ was confirmed to be 5 mol%. - Abstract: Eu{sup 2+}-doped BaAlF{sub 5} nanophosphors were synthesized via a facile one-pot hydrothermal method. The final products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and photoluminescence (PL) spectroscopy. XRD results showed that the prepared samples are single-phase. The FE-SEM and TEM images indicated that the prepared BaAlF{sub 5}:Eu{sup 2+} nanophosphors are composed of many rice-shaped particles with an average diameter of 40 nm. When excited at 260 nm, BaAlF{sub 5}:Eu{sup 2+} nanophosphors exhibit the sharp line emissions of Eu{sup 2+} at room temperature. The optimum doping concentration of Eu{sup 2+} was confirmed to be 5 mol%. The Van and Huang models were used to study the mechanism of concentration quenching and the electric dipole–dipole interaction between Eu{sup 2+} can be deduced to be a dominant for quenching fluorescence in BaAlF{sub 5}:Eu{sup 2+} nanophosphors. The strong ultraviolet emission of Eu{sup 2+} in BaAlF{sub 5}:Eu{sup 2+} nanophosphors suggests that these nanoparticles may have potential applications for sensing, spectrometer calibration and solid-state lasers.« less
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Steinberg, Simon; Card, Nathan; Mudring, Anja -Verena
The ternary Eu(Au/In) 2 (EuAu 0.46In 1.54 (2)) (I), EuAu 4(Au/In) 2 (EuAu 4+xIn 2–x with x = 0.75(2) (II), 0.93(2), and 1.03(2)), and Eu 5Au 16(Au/In) 6 (Eu 5Au 17.29In 4.71(3)) (III) have been synthesized, and their structures were characterized by single-crystal X-ray diffraction. I and II crystallize with the CeCu 2-type (Pearson Symbol oI12; Imma; Z = 4; a = 4.9018(4) Å; b = 7.8237(5) Å; c = 8.4457(5) Å) and the YbAl 4Mo 2-type (tI14; I4/ mmm; Z = 2; a = 7.1612(7) Å; c = 5.5268(7) Å) and exhibit significant Au/In disorder. I is composed ofmore » an Au/In-mixed diamond-related host lattice encapsulating Eu atoms, while the structure of II features ribbons of distorted, squared Au 8 prisms enclosing Eu, Au, and In atoms. Combination of these structural motifs leads to a new structure type as observed for Eu 5Au 16(Au/In) 6 (Eu 5Au 17.29In 4.71(3)) (oS108; Cmcm; Z = 4; a = 7.2283(4) Å; b = 9.0499(6) Å; c = 34.619(2) Å), which formally represents a one-dimensional intergrowth of the series EuAu 2–“EuAu 4In 2”. The site preferences of the disordered Au/In positions in II were investigated for different hypothetical “EuAu 4(Au/In) 2” models using the projector-augmented wave method and indicate that these structures attempt to optimize the frequencies of the heteroatomic Au–In contacts. Furthermore, a chemical bonding analysis on two “EuAu 5In” and “EuAu 4In 2” models employed the TB-LMTO-ASA method and reveals that the subtle interplay between the local atomic environments and the bond energies determines the structural and site preferences for these systems.« less
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Sorption of Eu(III) on granite: EPMA, LA-ICP-MS, batch and modeling studies.
Fukushi, Keisuke; Hasegawa, Yusuke; Maeda, Koushi; Aoi, Yusuke; Tamura, Akihiro; Arai, Shoji; Yamamoto, Yuhei; Aosai, Daisuke; Mizuno, Takashi
2013-11-19
Eu(III) sorption on granite was assessed using combined microscopic and macroscopic approaches in neutral to acidic conditions where the mobility of Eu(III) is generally considered to be high. Polished thin sections of the granite were reacted with solutions containing 10 μM of Eu(III) and were analyzed using EPMA and LA-ICP-MS. On most of the biotite grains, Eu enrichment up to 6 wt % was observed. The Eu-enriched parts of biotite commonly lose K, which is the interlayer cation of biotite, indicating that the sorption mode of Eu(III) by the biotite is cation exchange in the interlayer. The distributions of Eu appeared along the original cracks of the biotite. Those occurrences indicate that the prior water-rock interaction along the cracks engendered modification of biotite to possess affinity to the Eu(III). Batch Eu(III) sorption experiments on granite and biotite powders were conducted as functions of pH, Eu(III) loading, and ionic strength. The macroscopic sorption behavior of biotite was consistent with that of granite. At pH > 4, there was little pH dependence but strong ionic strength dependence of Eu(III) sorption. At pH < 4, the sorption of Eu(III) abruptly decreased with decreased pH. The sorption behavior at pH > 4 was reproducible reasonably by the modeling considering single-site cation exchange reactions. The decrease of Eu(III) sorption at pH < 4 was explained by the occupation of exchangeable sites by dissolved cationic species such as Al and Fe from granite and biotite in low-pH conditions. Granites are complex mineral assemblages. However, the combined microscopic and macroscopic approaches revealed that elementary reactions by a single mineral phase can be representative of the bulk sorption reaction in complex mineral assemblages.
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NASA Astrophysics Data System (ADS)
Ávila, Janaína N.; Ireland, Trevor R.; Lugaro, Maria; Gyngard, Frank; Zinner, Ernst; Cristallo, Sergio; Holden, Peter; Rauscher, Thomas
2013-05-01
Individual mainstream stardust silicon carbide (SiC) grains and a SiC-enriched bulk sample from the Murchison carbonaceous meteorite have been analyzed by the Sensitive High Resolution Ion Microprobe-Reverse Geometry for Eu isotopes. The mainstream grains are believed to have condensed in the outflows of ~1.5-3 M ⊙ carbon-rich asymptotic giant branch (AGB) stars with close-to-solar metallicity. The 151Eu fractions [fr(151Eu) = 151Eu/(151Eu+153Eu)] derived from our measurements are compared with previous astronomical observations of carbon-enhanced metal-poor stars enriched in elements made by slow neutron captures (the s-process). Despite the difference in metallicity between the parent stars of the grains and the metal-poor stars, the fr(151Eu) values derived from our measurements agree well with fr(151Eu) values derived from astronomical observations. We have also compared the SiC data with theoretical predictions of the evolution of Eu isotopic ratios in the envelope of AGB stars. Because of the low Eu abundances in the SiC grains, the fr(151Eu) values derived from our measurements show large uncertainties, in most cases being larger than the difference between solar and predicted fr(151Eu) values. The SiC aggregate yields a fr(151Eu) value within the range observed in the single grains and provides a more precise result (fr(151Eu) = 0.54 ± 0.03, 95% conf.), but is approximately 12% higher than current s-process predictions. The AGB models can match the SiC data if we use an improved formalism to evaluate the contribution of excited nuclear states in the calculation of the 151Sm(n, γ) stellar reaction rate.
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NASA Astrophysics Data System (ADS)
Matsuda, Toshihiro; Hattori, Fumihiro; Iwata, Hideyuki; Ohzone, Takashi
2018-04-01
Color tunable electroluminescence (EL) from metal-oxide-semiconductor devices with the rare-earth elements Tb and Eu is reported. Organic compound liquid sources of (Tb + Ba) and Eu with various Eu/Tb ratios from 0.001 to 0.4 were spin-coated on an n+-Si substrate and annealed to form an oxide insulator layer. The EL spectra had only peaks corresponding to the intrashell Tb3+/Eu3+ transitions in the spectral range from green to red, and the intensity ratio of the peaks was appropriately tuned using the appropriate Eu/Tb ratios in liquid sources. Consequently, the EL emission colors linearly changed from yellowish green to yellowish orange and eventually to reddish orange on the CIE chromaticity diagram. The gate current +I G current also affected the EL colors for the medium-Eu/Tb-ratio device. The structure of the surface insulator films analyzed by cross-sectional transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, and X-ray photoelectron spectroscopy (XPS) has four layers, namely, (Tb4O7 + Eu2O3), [Tb4O7 + Eu2O3 + (Tb/Eu/Ba)SiO x ], (Tb/Eu/Ba)SiO x , and SiO x -rich oxide. The EL mechanism proposed is that electrons injected from the Si substrate into the SiO x -rich oxide and Tb/Eu/Ba-silicate layers become hot electrons accelerated in a high electric field, and then these hot electrons excite Tb3+ and Eu3+ ions in the Tb4O7/Eu2O3 layers resulting in EL emission from Tb3+ and Eu3+ intrashell transitions.
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Interactions between Eu{sup 3+} ions in inorganic-organic hybrid materials
DOE Office of Scientific and Technical Information (OSTI.GOV)
Pelle, Fabienne, E-mail: fabienne-pelle@chimie-paristech.f; Aschehoug, Patrick; Surble, Suzy
2010-04-15
The optical properties of two-dimensional lanthanide dicarboxylates EuBDC or Eu{sub 2}(H{sub 2}O){sub 2}(O{sub 2}C-C{sub 6}H{sub 4}-CO{sub 2}){sub 3} and EuCDC (denoted also MIL94) or Eu{sub 2}(H{sub 2}O){sub 4}(O{sub 2}C-C{sub 6}H{sub 10}-CO{sub 2}){sub 3}.2H{sub 2}O are reported. The structures are built up from dimers of corner-sharing polyhedra and 1,3-benzenedicarboxylate (BDC) for EuBDC and from dimers of edge-sharing polyhedra and 1,3-benzenedicarboxylate (CDC) for EuCDC. The high Eu{sup 3+} concentration and the weak luminescence quenching allow the study of Eu{sup 3+} interactions. Anti-Stokes spectra from {sup 5}D{sub 1} are observed with excitation in {sup 5}D{sub 0}. These results are very unusual for Eu{supmore » 3+} ions and reflect strong interactions between ions within a dimer. Excitation spectrum of the Eu{sup 3+} luminescence strongly differs in both compounds in the UV range. In case of EuBDC, an efficient sensitization of the luminescence due to the ligand is observed between 250 and 350 nm while only 4f-4f transitions are recorded on the Eu{sup 3+} excitation spectrum in EuCDC. The efficiency of the sensitization of the rare earth by the host is discussed by taking into account the geometrical arrangement and the electronic delocalization of the ligands. - Graphical abstract: Excitation spectra monitoring the {sup 5}D{sub 0}->{sup 7}F{sub 2} transition with a dimer structure.« less
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29 CFR 776.13 - Commerce crossing international boundaries.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Commerce crossing international boundaries. 776.13 Section... Engaging âin Commerceâ § 776.13 Commerce crossing international boundaries. Under the Act, as amended, an employee engaged in “trade commerce, transportation, transmission, or communication” between any State and...
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29 CFR 776.13 - Commerce crossing international boundaries.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Commerce crossing international boundaries. 776.13 Section... Engaging âin Commerceâ § 776.13 Commerce crossing international boundaries. Under the Act, as amended, an employee engaged in “trade commerce, transportation, transmission, or communication” between any State and...
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29 CFR 776.13 - Commerce crossing international boundaries.
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Commerce crossing international boundaries. 776.13 Section... Engaging âin Commerceâ § 776.13 Commerce crossing international boundaries. Under the Act, as amended, an employee engaged in “trade commerce, transportation, transmission, or communication” between any State and...
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29 CFR 776.13 - Commerce crossing international boundaries.
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Commerce crossing international boundaries. 776.13 Section... Engaging âin Commerceâ § 776.13 Commerce crossing international boundaries. Under the Act, as amended, an employee engaged in “trade commerce, transportation, transmission, or communication” between any State and...
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29 CFR 776.13 - Commerce crossing international boundaries.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Commerce crossing international boundaries. 776.13 Section... Engaging âin Commerceâ § 776.13 Commerce crossing international boundaries. Under the Act, as amended, an employee engaged in “trade commerce, transportation, transmission, or communication” between any State and...
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40 CFR 763.169 - Distribution in commerce prohibitions.
Code of Federal Regulations, 2010 CFR
2010-07-01
... 40 Protection of Environment 30 2010-07-01 2010-07-01 false Distribution in commerce prohibitions... Commerce of Certain Asbestos-Containing Products; Labeling Requirements § 763.169 Distribution in commerce prohibitions. (a) After August 25, 1992, no person shall distribute in commerce, either for use in the United...
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40 CFR 763.169 - Distribution in commerce prohibitions.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 40 Protection of Environment 32 2012-07-01 2012-07-01 false Distribution in commerce prohibitions... Commerce of Certain Asbestos-Containing Products; Labeling Requirements § 763.169 Distribution in commerce prohibitions. (a) After August 25, 1992, no person shall distribute in commerce, either for use in the United...
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40 CFR 763.169 - Distribution in commerce prohibitions.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 40 Protection of Environment 32 2013-07-01 2013-07-01 false Distribution in commerce prohibitions... Commerce of Certain Asbestos-Containing Products; Labeling Requirements § 763.169 Distribution in commerce prohibitions. (a) After August 25, 1992, no person shall distribute in commerce, either for use in the United...
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40 CFR 763.169 - Distribution in commerce prohibitions.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 40 Protection of Environment 31 2014-07-01 2014-07-01 false Distribution in commerce prohibitions... Commerce of Certain Asbestos-Containing Products; Labeling Requirements § 763.169 Distribution in commerce prohibitions. (a) After August 25, 1992, no person shall distribute in commerce, either for use in the United...
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15 CFR 9.7 - Department of Commerce energy conservation mark.
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false Department of Commerce energy... FOR A VOLUNTARY LABELING PROGRAM FOR HOUSEHOLD APPLIANCES AND EQUIPMENT TO EFFECT ENERGY CONSERVATION § 9.7 Department of Commerce energy conservation mark. The Department of Commerce shall develop an...
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15 CFR 9.7 - Department of Commerce energy conservation mark.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false Department of Commerce energy... FOR A VOLUNTARY LABELING PROGRAM FOR HOUSEHOLD APPLIANCES AND EQUIPMENT TO EFFECT ENERGY CONSERVATION § 9.7 Department of Commerce energy conservation mark. The Department of Commerce shall develop an...
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15 CFR 9.7 - Department of Commerce energy conservation mark.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false Department of Commerce energy... FOR A VOLUNTARY LABELING PROGRAM FOR HOUSEHOLD APPLIANCES AND EQUIPMENT TO EFFECT ENERGY CONSERVATION § 9.7 Department of Commerce energy conservation mark. The Department of Commerce shall develop an...
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The Ministry of Commerce and Industry
Commerce Minister Participates In The Celebration Of The World Intellectual Property Day Program Deputy Commerce Minister Participates In The Celebration Of The World Intellectual Property Day Program Hon the World Trade Organization at the e-Commerce Week Commerce Minister meets with the Director-General
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NASA Astrophysics Data System (ADS)
Lian, Jingbao; Wang, Bingxin; Liang, Ping; Liu, Feng; Wang, Xuejiao
2014-04-01
La2O2S:Eu3+ translucent ceramic (LOS:Eu) was fabricated by pressureless reaction sintering method. It is found that the (La, Eu)2(OH)4SO4ṡ2H2O precursor is synthesized by co-precipitation using commercially available La(NO3)3, Eu(NO3)3, (NH4)2SO4 and NH3ṡH2O as the starting materials. And this precursor can be converted into pure La2O2SO4:Eu3+ phosphor by calcination at 800 °C for 1 h in air, which is composed of a few small needle agglomerated particles. Then the La2O2SO4:Eu3+ phosphor compact can be sintered into the LOS:Eu at 1500 °C for 2 h in the hybrid atmosphere of flowing hydrogen and argon. Under 387 nm UV light excitation, the LOS:Eu reveals a red light emission at 628 nm as the most prominent peak, which corresponds to the 5D0 → 7F2 transition of Eu3+ ions.
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NASA Astrophysics Data System (ADS)
Nikolaev, Anton; Kolesnikov, Ilya; Frank-Kamenetskaya, Olga; Kuz'mina, Maria
2017-12-01
Series of Eu-apatites were synthesized by precipitation from aqueous solutions with the Eu/Ca atomic ratio from 0.5% to 5% at T = 90 °C. Resulting precipitates were studied using different experimental techniques including X-ray powder diffraction, infrared and raman spectroscopy, scanning elecrton microscopy, EDX and photoluminescent spectroscopy. Eu-doped Ca-deficit nanosized non-stoichiometric hydroxyapatite with high water content has been obtained throughout the experiment. Europium content in the synthesized apatites reaches 0.24 apfu (Eu/Ca = 2.5%). Relations between Eu content is the solution and precipitate have been established. It was shown that Eu-monacite starts to precipitate as secondary phase at Eu/Ca ratio in starting solution 1% or higher. Maximum luminescence is observed in apatite with ∼2% Eu/Ca ratio (which equals to ∼0.2 apfu and corresponds to 3% Eu/Ca ratio in the starting solution). As an important and brand-new result, apatite with 2% Eu/Ca ratio can be considered as the most appropriate material for the producing biolabels for luminescent research in medicine and biology.
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The magnetic structure of EuCu 2Sb 2
Ryan, D. H.; Cadogan, J. M.; Anand, V. K.; ...
2015-05-06
Antiferromagnetic ordering of EuCu 2Sb 2 which forms in the tetragonal CaBe 2Ge 2-type structure (space group P4/nmm #129) has been studied using neutron powder diffraction and 151Eu Mössbauer spectroscopy. The room temperature 151Eu isomer shift of –12.8(1) mm/s shows the Eu to be divalent, while the 151Eu hyperfine magnetic field (B hf) reaches 28.7(2) T at 2.1 K, indicating a full Eu 2+ magnetic moment. B hf(T) follows a smoothmore » $$S=\\frac{7}{2}$$ Brillouin function and yields an ordering temperature of 5.1(1) K. Refinement of the neutron diffraction data reveals a collinear A-type antiferromagnetic arrangement with the Eu moments perpendicular to the tetragonal c-axis. As a result, the refined Eu magnetic moment at 0.4 K is 7.08(15) μ B which is the full free-ion moment expected for the Eu 2+ ion with $$S=\\frac{7}{2}$$ and a spectroscopic splitting factor of g = 2.« less
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NASA Astrophysics Data System (ADS)
Inaba, Tomohiro; Kojima, Takanori; Yamashita, Genki; Matsubara, Eiichi; Mitchell, Brandon; Miyagawa, Reina; Eryu, Osamu; Tatebayashi, Jun; Ashida, Masaaki; Fujiwara, Yasufumi
2018-04-01
In order to investigate the excitation processes in Eu,O-codoped GaN (GaN:Eu,O), the time-resolved photoluminescence signal including the rising part is analyzed. A rate equation is developed based upon a model for the excitation processes in GaN:Eu to fit the experimental data. The non-radiative recombination rate of the trap state in the GaN host, the energy transfer rate between the Eu3+ ions and the GaN host, the radiative transition probability of Eu3+ ion, as well as the ratio of the number of luminescent sites (OMVPE 4α and OMVPE 4β), are simultaneously determined. It is revealed and quantified that radiative transition probability of the Eu ion is the bottleneck for the enhancement of light output from GaN:Eu. We also evaluate the effect of the growth conditions on the luminescent efficiency of GaN:Eu quantitatively, and find the correlation between emission intensity of GaN:Eu and the fitting parameters introduced in our model.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Wang, Jian; Xia, Sheng-Qing, E-mail: shqxia@sdu.edu.cn; Tao, Xu-Tang
2013-09-15
Three new europium pnictides Eu{sub 2}ZnP{sub 2}, Eu{sub 2}Zn{sub 2}P{sub 3} and Eu{sub 2}Cd{sub 2}As{sub 3} have been synthesized and their structures were determined by single-crystal X-ray diffraction. Eu{sub 2}ZnP{sub 2} is isotypic with Yb{sub 2}CdSb{sub 2} (Cmc2{sub 1} (No. 36); cell parameters a=4.1777(7) Å, b=15.925(3) Å, c=7.3008(12) Å), while the latter two compounds crystallize with the Ba{sub 2}Cd{sub 2}Sb{sub 3} structure type (C2/m (No. 12); cell parameters a=15.653(5)/16.402(1) Å, b=4.127(1)/4.445(4) Å, c=11.552(4)/12.311(1) Å and β=126.647(4)/126.515(7)° for Eu{sub 2}Zn{sub 2}P{sub 3} and Eu{sub 2}Cd{sub 2}As{sub 3}, respectively). Magnetic susceptibility measurements in the interval 5–300 K confirm paramagnetic behavior and effectivemore » magnetic moments characteristic of Eu{sup 2+} ([Xe] 4f{sup 7}) ground states. Temperature-dependent electrical conductivity measurements also prove that Eu{sub 2}Cd{sub 2}As{sub 3} is a semiconducting compound with a narrow band gap of 0.059 eV below 100 K. According to TG/DSC analyses, Eu{sub 2}Cd{sub 2}As{sub 3} starts to decompose at about 950 K. - Graphical abstract: A polyhedral view of the crystal structure of new pnictides Eu{sub 2}T{sub 2}Pn{sub 3} (T=Zn or Cd; Pn=P or As). Display Omitted - Highlights: • Three new ternary pnictide Zintl compounds, Eu{sub 2}ZnP{sub 2}, Eu{sub 2}Zn{sub 2}P{sub 3} and Eu{sub 2}Cd{sub 2}As{sub 3}, have been synthesized and characterized. • The europium cations are divalent and ferromagnetically coupled in both Eu{sub 2}Zn{sub 2}P{sub 3} and Eu{sub 2}Cd{sub 2}As{sub 3}. • Eu{sub 2}Cd{sub 2}As{sub 3} has a very small band gap of 0.06 eV and starts to decompose over 950 K.« less
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Lakshminarasimhan, N., E-mail: nlnsimha@gmail.com; Varadaraju, U.V.
2014-12-15
Graphical abstract: Eu{sup 3+} structural probe – difference in Eu{sup 3+} PL emission in (a) NaCa{sub 3}Bi{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F and (b) NaCa{sub 3}La{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F suggests Bi{sup 3+} with preferential site occupancy at M(II) site directing Eu{sup 3+} to M(I) site. - Highlights: • Eu{sup 3+} luminescent probe used for establishing the role of 6s{sup 2} lone pair electrons of Bi{sup 3+} in fluorapatite. • Difference in Eu{sup 3+} PL emission spectral features in NaCa{sub 3}Bi{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F and NaCa{sub 3}La{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F. • Preferential site occupancy of Bi{sup 3+} in M(II)more » site directs Eu{sup 3+} to M(I) site in NaCa{sub 3}Bi{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F. - Abstract: Eu{sup 3+} luminescence was used as a structural probe in understanding the preferential site occupancy of lone pair cation, Bi{sup 3+}, in fluorapatite by comparing the photoluminescence (PL) emission spectral features with that of in analogous La{sup 3+} based fluorapatite. The fluorapatites, NaCa{sub 3}Bi{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F and NaCa{sub 3}La{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F, were synthesized by conventional high temperature solid state reaction method and characterized by powder X-ray diffraction (XRD) and FT-IR spectroscopy. The Eu{sup 3+} PL results revealed a difference in the emission spectral features in NaCa{sub 3}Bi{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F and NaCa{sub 3}La{sub 0.95}Eu{sub 0.05}(PO{sub 4}){sub 3}F. This difference in Eu{sup 3+} PL emission can be attributed to the difference in its site occupancy in the studied fluorapatites.« less
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The effect of X-ray exposure on Ba2SiO4:Eu3+
NASA Astrophysics Data System (ADS)
Volhard, Max-Fabian; Jüstel, Thomas
2018-03-01
The ortho-silicates Ba2SiO4:Eu3+ and Ba2SiO4:Eu2+ are well-established materials for fluorescent light sources, e.g., phosphor converted LEDs. Samples containing Eu2+or Eu3+were synthesised by the solid-state-method, and the phase purity was determined by X-ray powder diffractometry. The photoluminescence of both phosphors was examined as a function of the pre-treatment. Upon irradiation of Ba2SiO4:Eu3+ with X-rays (tungsten target source), the reduction of Eu3+ towards Eu2+ was observed. This reduction behaviour was thoroughly recorded, and the linearity of the process was determined. Furthermore, the relationship between the acceleration voltage and the reduction process is discussed.
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Spectroscopic studies on interaction of BSA and Eu(III) complexes with H5ph-dtpa and H5dtpa ligands.
Kong, Deyong; Qin, Cui; Fan, Ping; Li, Bing; Wang, Jun
2015-04-05
An novel aromatic aminopolycarboxylic acid ligand, N-(2-N,N-Dicarboxymethylaminophenyl) ethylenediamine-N,N',N'-triacetic acid (H5ph-dtpa), was synthesized by improving experimental method and its corresponding Eu(III) complex, Na2[EuIII(ph-dtpa)(H2O)]·6H2O, was successfully prepared through heat-refluxing method. As a comparison, the Eu(III) complex with diethylenetriamine-N,N,N',N',N″-pentaacetic acid (H5dtpa) ligand, Na2[Eu(III)(dtpa)(H2O)]·6H2O, was also prepared by the same method. And then, the interaction between prepared Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) and bovine serum albumin (BSA) in aqueous solution were studied by the combination of ultraviolet-visible (UV-vis), fluorescence and circular dichroism (CD) spectroscopies. In addition, the binding sites of Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) to BSA molecules were also estimated by synchronous fluorescence. Moreover, the theoretical and experimental results show that the Van der Waals, hydrogen bond and π-π stacking interactions are the mainly impulse to the reaction. The binding distances (r) between Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) and BSA were obtained according to Förster's non-radiative energy transfer theory. Also, the determined UV-vis absorption spectroscopy, synchronous fluorescence and circular dichroism (CD) spectra showed that the conformation of BSA could be changed in the presence of Eu(III) complexes. The obtained results can help understand the action mode between rare earth metal complexes of aminopolycarboxylic acid ligands with BSA and they are also expected to provide important information of designs of new inspired drugs. Copyright © 2015 Elsevier B.V. All rights reserved.
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Spectroscopic studies on interaction of BSA and Eu(III) complexes with H5ph-dtpa and H5dtpa ligands
NASA Astrophysics Data System (ADS)
Kong, Deyong; Qin, Cui; Fan, Ping; Li, Bing; Wang, Jun
2015-04-01
An novel aromatic aminopolycarboxylic acid ligand, N-(2-N,N-Dicarboxymethylaminophenyl) ethylenediamine-N,N‧,N‧-triacetic acid (H5ph-dtpa), was synthesized by improving experimental method and its corresponding Eu(III) complex, Na2[EuIII(ph-dtpa)(H2O)]·6H2O, was successfully prepared through heat-refluxing method. As a comparison, the Eu(III) complex with diethylenetriamine-N,N,N‧,N‧,N″-pentaacetic acid (H5dtpa) ligand, Na2[EuIII(dtpa)(H2O)]·6H2O, was also prepared by the same method. And then, the interaction between prepared Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) and bovine serum albumin (BSA) in aqueous solution were studied by the combination of ultraviolet-visible (UV-vis), fluorescence and circular dichroism (CD) spectroscopies. In addition, the binding sites of Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) to BSA molecules were also estimated by synchronous fluorescence. Moreover, the theoretical and experimental results show that the Van der Waals, hydrogen bond and π-π stacking interactions are the mainly impulse to the reaction. The binding distances (r) between Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) and BSA were obtained according to Förster's non-radiative energy transfer theory. Also, the determined UV-vis absorption spectroscopy, synchronous fluorescence and circular dichroism (CD) spectra showed that the conformation of BSA could be changed in the presence of Eu(III) complexes. The obtained results can help understand the action mode between rare earth metal complexes of aminopolycarboxylic acid ligands with BSA and they are also expected to provide important information of designs of new inspired drugs.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Li, Maoying; Zhang, Zhenyi; Cao, Tieping
Graphical abstract: Nanofibers and nanoribbons of poly (methyl methacrylate)/Eu{sup 3+} ions composites were successfully prepared by using a simple electrospinning technique. And the photoluminescence properties of the above PMMA/Eu{sup 3+} ions composites were studied. Highlights: Black-Right-Pointing-Pointer Nanofibers and nanoribbons of PMMA/Eu{sup 3+} ions composites are fabricated by electrospinning. Black-Right-Pointing-Pointer Photoluminescence properties of as-electrospun PMMA/Eu{sup 3+} ions composites are studied. Black-Right-Pointing-Pointer The ratios of electric- and magnetic-dipole transitions are enhanced by increasing electrospinning voltage. -- Abstract: Nanofibers and nanoribbons of poly (methyl methacrylate) (PMMA)/Eu{sup 3+} ions composites with different concentration of Eu{sup 3+} ions were successfully prepared by using a simplemore » electrospinning technique. From the results of scanning electron microscopy and energy-dispersive X-ray spectroscopy, we found that the morphology of the as-electrospun PMMA/Eu{sup 3+} ions composites could be changed from fiber to ribbon structure by adjusting the concentration of Eu{sup 3+} ions in the electrospun precursor solution. The coordination between the Eu{sup 3+} ions and PMMA molecules were investigated by Fourier transform infrared spectroscopy and differential thermal analysis. The photoluminescence (PL) properties of the as-electrospun PMMA/Eu{sup 3+} ions composites were studied in comparison to those of the Eu(NO{sub 3}){sub 3} powder. It was showed that the {sup 5}D{sub 0}-{sup 7}F{sub J} (J = 0, 1, 2, 3, 4) emission appeared in the PL spectra of the as-electrospun PMMA/Eu{sup 3+} ions composites, whereas the {sup 5}D{sub 0}-{sup 7}F{sub 0} emission was completely absent in the PL spectra of Eu(NO{sub 3}){sub 3} powder due to the different local environments surrounding Eu{sup 3+} ions. It was interesting to note that the intensity ratios of the electric-dipole and magnetic-dipole transitions for the PMMA/Eu{sup 3+} ions composites could be enhanced significantly by increasing electrospinning voltage.« less
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Electron tunneling transport across heterojunctions between europium sulfide and indium arsenide
NASA Astrophysics Data System (ADS)
Kallaher, Raymond L.
This dissertation presents research done on utilizing the ferromagnetic semiconductor europium sulfide (EuS) to inject spin polarized electrons into the non-magnetic semiconductor indium arsenide (InAs). There is great interest in expanding the functionality of modern day electronic circuits by creating devices that depend not only on the flow of charge in the device, but also on the transport of spin through the device. Within this mindset, there is a concerted effort to establish an efficient means of injecting and detecting spin polarized electrons in a two dimensional electron system (2DES) as the first step in developing a spin based field effect transistor. Thus, the research presented in this thesis has focused on the feasibility of using EuS, in direct electrical contact with InAs, as a spin injecting electrode into an InAs 2DES. Doped EuS is a concentrated ferromagnetic semiconductor, whose conduction band undergoes a giant Zeeman splitting when the material becomes ferromagnetic. The concomitant difference in energy between the spin-up and spin-down energy bands makes the itinerant electrons in EuS highly spin polarized. Thus, in principle, EuS is a good candidate to be used as an injector of spin polarized electrons into non-magnetic materials. In addition, the ability to adjust the conductivity of EuS by varying the doping level in the material makes EuS particularly suited for injecting spins into non-magnetic semiconductors and 2DES. For this research, thin films of EuS have been grown via e-beam evaporation of EuS powder. This growth technique produces EuS films that are sulfur deficient; these sulfur vacancies act as intrinsic electron donors and the resulting EuS films behave like heavily doped ferromagnetic semiconductors. The growth parameters and deposition procedures were varied and optimized in order to fabricate films that have minimal crystalline defects. Various properties and characteristics of these EuS films were measured and compared to those characteristics found in previous reported work on doped EuS crystals. In particular, the magnetic switching behavior of individual micro-fabricated EuS structures was investigated to determine what types of spintronic devices EuS is best suited for. These studies found that the crystalline anisotropy of EuS dominates the switching behavior in EuS thin film structures with minimum feature sizes greater than ˜5 mum. This, in conjunction with the relatively high resistance of junctions between EuS and semiconductors, restricts the use of two tandem EuS electrodes in all semiconductor spintronic devices that require independently switching ferromagnetic electrodes. Spin transport studies in InAs 2DES are particularly interesting because of the heterostructure's high electron mobility and tunable spin-orbit interactions. Detailed measurements of the electrical transport characteristics across the heterojunction formed between EuS and InAs were taken in order to investigate the spin transport characteristics across the junction. These measurements show that the electrical transport across the heterojunction, below the ferromagnetic transition temperature, is directly related to the magnetization of the EuS layer and thus the transport is dominated by the spin-dependent Schottky barrier formed in EuS. Using a simple theory developed for these junctions, the magnitude of the change in barrier height---half the Zeeman splitting of the conduction band in EuS---as found to be ˜0.22 eV. The electrical transport measurements of the heterojunction between EuS and InAs at temperatures well above the ferromagnetic transition temperature of EuS shows that there are at least two separate scattering mechanisms in these junctions. As expected, critical scattering is the dominate scattering mechanism in the strongly paramagnetic regime; however, unexpectedly, the data show that critical scattering is not the dominate mechanism at temperatures greater than ˜100 K. The high temperature electrical transport measurements of the EuS/InAs heterojunction, in conjunction with low temperature zero-bias conductance measurements on junctions between EuS and gold (Au), suggest that there exists an interfacial layer in series with the magnetic Schottky barrier in these EuS junctions. This interfacial layer is modeled and explained as resulting from a rather high concentration of defects at the interface between EuS and the counter electrode.
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Development and Validation of Shipboard Noise Exposure Data Acquisition Procedures.
1981-11-05
EL6 EL2B __EL7 EL3 _ EL4 - EL5 __ _ __ _ _ __ _ _ ___ _ _ IE 5 PERSONNEL ASSIGNMENT DATA LOC. MEAS.4) BILLET RATEG WEAR1 WATCHO HRS.JDAY AT LOC...Inc. Table 11-9 Sub-Areas used for Noise Level Averages Sub-Area Locations Included . - ELT-Eng. Room, Lower Level ELIB, EL2B, EL3, EL4 , EL5, EL6...Area Locations Included ERT-Engine Room ELIB, EL2B, EL3, EL4 , EL5, EL6, EL7, EUIW, EU2B, EU3, EU4, EU5, EU6, EU7, EU8, ESIW ES2, ES3, ES4, ELT, EUT
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Xu, Qinghu; Gong, Yanjun; Xu, Wenjing; Xu, Jun; Deng, Feng; Dou, Tao
2011-06-01
A seeded approach was developed to synthesize high-silica EU-1 zeolite via inhibiting the co-crystallization of ZSM-48 in the presence of hexamethonium (HM) ions. A systematic study was carried out to determine factors such as seed content and SiO(2)/Al(2)O(3) ratio, which influenced the crystallization of high-silica EU-1 and transformation of EU-1 into ZSM-48. Using EU-1 seeds, not only well-crystallized pure EU-1 zeolites with SiO(2)/Al(2)O(3) ratios more than 500 were synthesized, but also the co-crystalline of ZSM-48/EU-1 or pure ZSM-48 was obtained in control from silica-rich mixture gels. Furthermore, the kinetic features of the seeded synthesis of EU-1 zeolites with SiO(2)/Al(2)O(3) ratios of 55, 190, and 500 were examined. It was found that seeds played crucial roles in the decrease of apparent activation energy of EU-1 nucleation and inhibiting the transformation of EU-1 into ZSM-48. The HM and Al species performed synergistic roles to inhibit the formation ZSM-48 during high-silica EU-1 nucleation and crystal growth. Copyright © 2011 Elsevier Inc. All rights reserved.
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Spectroscopy Study on the Location and Distribution of Eu3+ Ions in TiO2 Nanoparticles
NASA Astrophysics Data System (ADS)
Tsuboi, Taiju; Setiawati, Elly; Kawano, Katsuyasu
2008-09-01
Eu3+- and non-doped TiO2 nanoparticles were synthesized by the sol-gel method at sintering temperatures of 500 or 900 °C. The photoluminescence spectra of these nanoparticles have been investigated at various temperatures between 290 and 12 K. Two kinds of Eu3+ photoluminescence spectra were observed. One spectrum consists of sharp lines; the other consists of broad bands. The former was obtained by indirect excitation into Eu3+ with light of wavelengths shorter than 330 nm, while the latter was obtained by direct excitation into Eu3+ with light of wavelengths longer than 380 nm which correspond to the Eu3+ absorption bands. In the latter case, different spectra were obtained depending on the excitation wavelength even in the same absorption band. It is suggested that the sharp line spectrum is caused by Eu3+ ions substituted for Ti4+ but with some distortion around the Eu3+ ions in the matrix of TiO2 due to the large difference in ionic radius between the Ti4+ and Eu3+ ions, which are mainly present in the interior region of the nanoparticle. The broad band spectrum is caused by the disordered Eu3+ ions with Eu-O-Ti bonds which are predominantly present in the near surface region.
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NASA Astrophysics Data System (ADS)
Suda, Yoriko; Kamigaki, Yoshiaki; Yamamoto, Hajime
2018-04-01
In red phosphor CaAlSiN3:Eu2+, unintentional blue emission occurs with increasing intensity at low Eu2+ concentrations and also at low measurement temperatures. Time-resolved photoluminescence measurements were used to confirm the decrease in red emission and increase in blue emission with the decreasing Eu2+ concentration. The peak timing of blue emission occurred faster than that of red emission, and long lasting luminescence of red emission was observed as well as that of blue emission. The Eu2+ concentration dependences of the red and blue emissions were similar to those of the g values 4.75 (Eu2+) and 2.0025 (nitrogen vacancies), respectively, which were observed from electron spin resonance (ESR) measurements. The origin of the blue emission is proposed to be nitrogen vacancy defects, which had about the same ESR signal intensity as that of Eu2+ ions in CaAlSiN3:Eu2+ containing 0.01 at. % Eu2+. The possibility of red emission also arising from excited electron tunneling or thermal pathways via nitrogen vacancies is discussed. Long lasting red emission was observed, which is proposed to involve trapped electrons remaining at nitrogen vacancies, yielding blue emission and inducing red emission from Eu2+ ions.
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Tuning the luminescence of ZnO:Eu nanoparticles for applications in biology and medicine
NASA Astrophysics Data System (ADS)
Kaszewski, Jarosław; Kiełbik, Paula; Wolska, Ewelina; Witkowski, Bartłomiej; Wachnicki, Łukasz; Gajewski, Zdzisław; Godlewski, Marek; Godlewski, Michał M.
2018-06-01
Zinc oxide nanoparticles were synthesized with microwave hydrothermal technique and tested as luminescent contrast for biological imaging. Luminescence was activated by Eu3+ ions embedded in the nanoparticle matrix in the increasing concentrations of 1, 5 and 10 %mol. It was found that europium did not create a separate crystalline phase up to the concentration as high as 5 %mol. However, Eu3+ ions did not substitute Zn2+ in the host lattice, but allocated in the low symmetry environment. It was proposed that europium was locating in the inter-grain space or on the surface of nanoparticles. The luminescence intensity in ZnO:Eu, as well as the size of particles, increased with the Eu ion concentration. Moreover, in 10 %mol Eu sample, the separate phase of Eu-hydroxide was identified with crystals of micrometre length. Interestingly, in vivo study revealed, that contrary to the in silico experiments, following gastric gavage, the brightest nanoparticle-related luminescence signal was observed at 1 %mol. concentration of Eu. Since the alimentary uptake of nanoparticles was related to their size, we concluded that the increase in luminescence at 5 and 10 %mol. Eu concentrations was associated with the largest ZnO:Eu and Eu-hydroxide particles that did not cross the gastrointestinal barrier.
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Antiferromagnetism in EuCu 2As 2 and EuCu 1.82Sb 2 single crystals
Anand, V. K.; Johnston, D. C.
2015-05-07
Single crystals of EuCu 2As 2 and EuCu 2Sb 2 were grown from CuAs and CuSb self-flux, respectively. The crystallographic, magnetic, thermal, and electronic transport properties of the single crystals were investigated by room-temperature x-ray diffraction (XRD), magnetic susceptibility χ versus temperature T, isothermal magnetization M versus magnetic field H, specific heat C p(T), and electrical resistivity ρ(T) measurements. EuCu 2As 2 crystallizes in the body-centered tetragonal ThCr 2Si 2-type structure (space group I4/mmm), whereas EuCu 2Sb 2 crystallizes in the related primitive tetragonal CaBe 2Ge 2-type structure (space group P4/nmm). The energy-dispersive x-ray spectroscopy and XRD data for themore » EuCu 2Sb 2 crystals showed the presence of vacancies on the Cu sites, yielding the actual composition EuCu 1.82Sb 2. The ρ(T) and C p(T) data reveal metallic character for both EuCu 2As 2 and EuCu 1.82Sb 2. Antiferromagnetic (AFM) ordering is indicated from the χ(T),C p(T), and ρ(T) data for both EuCu 2As 2 (T N = 17.5 K) and EuCu 1.82Sb 2 (T N = 5.1 K). In EuCu 1.82Sb 2, the ordered-state χ(T) and M(H) data suggest either a collinear A-type AFM ordering of Eu +2 spins S = 7/2 or a planar noncollinear AFM structure, with the ordered moments oriented in the tetragonal ab plane in either case. This ordered-moment orientation for the A-type AFM is consistent with calculations with magnetic dipole interactions. As a result, the anisotropic χ(T) and isothermal M(H) data for EuCu 2As 2, also containing Eu +2 spins S = 7/2, strongly deviate from the predictions of molecular field theory for collinear AFM ordering and the AFM structure appears to be both noncollinear and noncoplanar.« less
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Code of Federal Regulations, 2014 CFR
2014-07-01
... commerce; (e) Commerce means trade, traffic, commerce, transportation, or communication among the several... Occupational Safety and Health; (c) Employer means a person engaged in a business affecting commerce who has...
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Code of Federal Regulations, 2012 CFR
2012-07-01
... commerce; (e) Commerce means trade, traffic, commerce, transportation, or communication among the several... Occupational Safety and Health; (c) Employer means a person engaged in a business affecting commerce who has...
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Code of Federal Regulations, 2011 CFR
2011-07-01
... commerce; (e) Commerce means trade, traffic, commerce, transportation, or communication among the several... Occupational Safety and Health; (c) Employer means a person engaged in a business affecting commerce who has...
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Code of Federal Regulations, 2010 CFR
2010-07-01
... commerce; (e) Commerce means trade, traffic, commerce, transportation, or communication among the several... Occupational Safety and Health; (c) Employer means a person engaged in a business affecting commerce who has...
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Code of Federal Regulations, 2013 CFR
2013-07-01
... commerce; (e) Commerce means trade, traffic, commerce, transportation, or communication among the several... Occupational Safety and Health; (c) Employer means a person engaged in a business affecting commerce who has...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false Purpose. 1.1 Section 1.1 Commerce and Foreign Trade Office of the Secretary of Commerce THE SEAL OF THE DEPARTMENT OF COMMERCE § 1.1 Purpose. The purpose of this part is to describe the seal of the Department of Commerce and to delegate...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false Purpose. 1.1 Section 1.1 Commerce and Foreign Trade Office of the Secretary of Commerce THE SEAL OF THE DEPARTMENT OF COMMERCE § 1.1 Purpose. The purpose of this part is to describe the seal of the Department of Commerce and to delegate...
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33 CFR 329.6 - Interstate or foreign commerce.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 33 Navigation and Navigable Waters 3 2012-07-01 2012-07-01 false Interstate or foreign commerce... commerce. (a) Nature of commerce: type, means, and extent of use. The types of commercial use of a waterway... transportation of commerce which is the determinative factor, and not the time, extent or manner of that use. As...
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29 CFR 779.108 - Goods produced for commerce.
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Goods produced for commerce. 779.108 Section 779.108 Labor... Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.108 Goods produced for commerce. Goods are “produced for commerce” if they are “produced, manufactured, mined, handled or...
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29 CFR 779.108 - Goods produced for commerce.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Goods produced for commerce. 779.108 Section 779.108 Labor... Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.108 Goods produced for commerce. Goods are “produced for commerce” if they are “produced, manufactured, mined, handled or...
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7 CFR 800.30 - Foreign commerce grain business.
Code of Federal Regulations, 2013 CFR
2013-01-01
... 7 Agriculture 7 2013-01-01 2013-01-01 false Foreign commerce grain business. 800.30 Section 800.30... § 800.30 Foreign commerce grain business. “Foreign commerce grain business” is defined as the business of buying grain for sale in foreign commerce or the business of handling, weighing, or transporting...
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29 CFR 784.18 - Commerce activities of employees.
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Commerce activities of employees. 784.18 Section 784.18... Exemptions Provisions of the Act § 784.18 Commerce activities of employees. The Fair Labor Standards Act has... foreign commerce or (b) in the production of goods for such commerce, which is defined to include any...
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33 CFR 329.6 - Interstate or foreign commerce.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 33 Navigation and Navigable Waters 3 2013-07-01 2013-07-01 false Interstate or foreign commerce... commerce. (a) Nature of commerce: type, means, and extent of use. The types of commercial use of a waterway... transportation of commerce which is the determinative factor, and not the time, extent or manner of that use. As...
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29 CFR 784.18 - Commerce activities of employees.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Commerce activities of employees. 784.18 Section 784.18... Exemptions Provisions of the Act § 784.18 Commerce activities of employees. The Fair Labor Standards Act has... foreign commerce or (b) in the production of goods for such commerce, which is defined to include any...
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29 CFR 779.108 - Goods produced for commerce.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Goods produced for commerce. 779.108 Section 779.108 Labor... Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.108 Goods produced for commerce. Goods are “produced for commerce” if they are “produced, manufactured, mined, handled or...
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33 CFR 329.6 - Interstate or foreign commerce.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 33 Navigation and Navigable Waters 3 2014-07-01 2014-07-01 false Interstate or foreign commerce... commerce. (a) Nature of commerce: type, means, and extent of use. The types of commercial use of a waterway... transportation of commerce which is the determinative factor, and not the time, extent or manner of that use. As...
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29 CFR 401.3 - Industry affecting commerce.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 2 2012-07-01 2012-07-01 false Industry affecting commerce. 401.3 Section 401.3 Labor... STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.3 Industry affecting commerce. Industry affecting commerce means any activity, business, or industry in commerce or in which a labor dispute would hinder or...
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29 CFR 401.3 - Industry affecting commerce.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 2 2014-07-01 2014-07-01 false Industry affecting commerce. 401.3 Section 401.3 Labor... STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.3 Industry affecting commerce. Industry affecting commerce means any activity, business, or industry in commerce or in which a labor dispute would hinder or...
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7 CFR 800.30 - Foreign commerce grain business.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 7 Agriculture 7 2011-01-01 2011-01-01 false Foreign commerce grain business. 800.30 Section 800.30... § 800.30 Foreign commerce grain business. “Foreign commerce grain business” is defined as the business of buying grain for sale in foreign commerce or the business of handling, weighing, or transporting...
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29 CFR 779.108 - Goods produced for commerce.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Goods produced for commerce. 779.108 Section 779.108 Labor... Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.108 Goods produced for commerce. Goods are “produced for commerce” if they are “produced, manufactured, mined, handled or...
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29 CFR 784.18 - Commerce activities of employees.
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Commerce activities of employees. 784.18 Section 784.18... Exemptions Provisions of the Act § 784.18 Commerce activities of employees. The Fair Labor Standards Act has... foreign commerce or (b) in the production of goods for such commerce, which is defined to include any...
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29 CFR 401.3 - Industry affecting commerce.
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 2 2011-07-01 2011-07-01 false Industry affecting commerce. 401.3 Section 401.3 Labor... STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.3 Industry affecting commerce. Industry affecting commerce means any activity, business, or industry in commerce or in which a labor dispute would hinder or...
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29 CFR 779.108 - Goods produced for commerce.
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Goods produced for commerce. 779.108 Section 779.108 Labor... Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.108 Goods produced for commerce. Goods are “produced for commerce” if they are “produced, manufactured, mined, handled or...
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33 CFR 329.6 - Interstate or foreign commerce.
Code of Federal Regulations, 2011 CFR
2011-07-01
... 33 Navigation and Navigable Waters 3 2011-07-01 2011-07-01 false Interstate or foreign commerce... commerce. (a) Nature of commerce: type, means, and extent of use. The types of commercial use of a waterway... transportation of commerce which is the determinative factor, and not the time, extent or manner of that use. As...
-
29 CFR 401.3 - Industry affecting commerce.
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 2 2010-07-01 2010-07-01 false Industry affecting commerce. 401.3 Section 401.3 Labor... STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.3 Industry affecting commerce. Industry affecting commerce means any activity, business, or industry in commerce or in which a labor dispute would hinder or...
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7 CFR 800.30 - Foreign commerce grain business.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 7 Agriculture 7 2010-01-01 2010-01-01 false Foreign commerce grain business. 800.30 Section 800.30... § 800.30 Foreign commerce grain business. “Foreign commerce grain business” is defined as the business of buying grain for sale in foreign commerce or the business of handling, weighing, or transporting...
-
29 CFR 401.3 - Industry affecting commerce.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 2 2013-07-01 2013-07-01 false Industry affecting commerce. 401.3 Section 401.3 Labor... STANDARDS MEANING OF TERMS USED IN THIS SUBCHAPTER § 401.3 Industry affecting commerce. Industry affecting commerce means any activity, business, or industry in commerce or in which a labor dispute would hinder or...
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29 CFR 784.18 - Commerce activities of employees.
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Commerce activities of employees. 784.18 Section 784.18... Exemptions Provisions of the Act § 784.18 Commerce activities of employees. The Fair Labor Standards Act has... foreign commerce or (b) in the production of goods for such commerce, which is defined to include any...
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29 CFR 784.18 - Commerce activities of employees.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Commerce activities of employees. 784.18 Section 784.18... Exemptions Provisions of the Act § 784.18 Commerce activities of employees. The Fair Labor Standards Act has... foreign commerce or (b) in the production of goods for such commerce, which is defined to include any...
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78 FR 23699 - Implementation of OMB Guidance on Drug-Free Workplace Requirements
Federal Register 2010, 2011, 2012, 2013, 2014
2013-04-22
... Part? The Secretary of Commerce or designee. Subpart F--Definitions [Reserved] Title 15--Commerce and... DEPARTMENT OF COMMERCE Office of the Secretary 2 CFR Part 1329 15 CFR Part 29 [Docket No...: U.S. Department of Commerce. ACTION: Proposed rule. SUMMARY: The U.S. Department of Commerce is...
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7 CFR 800.30 - Foreign commerce grain business.
Code of Federal Regulations, 2014 CFR
2014-01-01
... 7 Agriculture 7 2014-01-01 2014-01-01 false Foreign commerce grain business. 800.30 Section 800.30... § 800.30 Foreign commerce grain business. “Foreign commerce grain business” is defined as the business of buying grain for sale in foreign commerce or the business of handling, weighing, or transporting...
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7 CFR 800.30 - Foreign commerce grain business.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 7 Agriculture 7 2012-01-01 2012-01-01 false Foreign commerce grain business. 800.30 Section 800.30... § 800.30 Foreign commerce grain business. “Foreign commerce grain business” is defined as the business of buying grain for sale in foreign commerce or the business of handling, weighing, or transporting...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false Purpose. 1.1 Section 1.1 Commerce and Foreign Trade Office of the Secretary of Commerce THE SEAL OF THE DEPARTMENT OF COMMERCE § 1.1 Purpose. The purpose of this part is to describe the seal of the Department of Commerce and to delegate...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false Purpose. 1.1 Section 1.1 Commerce and Foreign Trade Office of the Secretary of Commerce THE SEAL OF THE DEPARTMENT OF COMMERCE § 1.1 Purpose. The purpose of this part is to describe the seal of the Department of Commerce and to delegate...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false Purpose. 1.1 Section 1.1 Commerce and Foreign Trade Office of the Secretary of Commerce THE SEAL OF THE DEPARTMENT OF COMMERCE § 1.1 Purpose. The purpose of this part is to describe the seal of the Department of Commerce and to delegate...
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Mutational analysis of the major soybean UreF paralogue involved in urease activation
USDA-ARS?s Scientific Manuscript database
In soybean, mutation at Eu2 or Eu3 eliminates the urease activities of both the embryo-specific and the tissue-ubiquitous (assimilatory) isozymes, encoded by Eu1 and Eu4, respectively. Eu3 encodes UreG, a GTP’ase necessary for proper emplacement of Ni and carbon dioxide in the urease active site. ...
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Education of EU Migrant Children in EU Member States. Research Report
ERIC Educational Resources Information Center
Harte, Emma; Herrera, Facundo; Stepanek, Martin
2016-01-01
This policy brief looks at the education of EU migrant children in the context of intra-EU mobility. It examines some of the literature and data on the topic in order to identify key differences between EU migrant children and non-migrant children. There are disparities in educational performance between migrants and non-migrants. The brief…
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Nagarajan, S; Sudarkodi, R
2009-01-01
Photoluminescence (PL) of thallium co-doped with KCl0.5Br0.5:Eu2+ powder phosphors display emission bands at 320 and 370 nm attributable to centres involving Tl+ ions in addition to characteristic Eu2+ emission around 420 nm. Additional PL excitation and emission bandS observed around 260 and 380 nm, respectively, were observed in the double-doped KCl0.5Br0.5:Eu2+, Tl+ powder phosphors and are attributed to complex centres involving Tl+ and Eu2+ ions. The enhancement observed in the intensity of Eu2+ emission around 420 nm with the addition of TlBr in KCl0.5Br0.5:Eu2+ powder phosphors is attributed to the energy transfer from Tl+ --> Eu2+ ions. Photostimulated luminescence (PSL) studies of gamma-irradiated KCl0.5Br0.5:Eu2+, Tl+ mixed phosphors are reported and a tentative PSL mechanism in the phosphors has been suggested.
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NASA Astrophysics Data System (ADS)
Matsumiya, Masahiko; Takagi, Ryuzo
2000-08-01
For the pyrochemical reprocessing of spent metallic nuclear fuels in molten salt baths it is important to investigate the behavior of the electrochemically negative elements Eu and Sr, which are significant fission products. Voltammetric and chronopotentiometric studies have shown that the reduction of Eu 2+ and Sr 2+ on liquid Pb cathodes in molten chloride baths at 1073 K follows the alloy formation reaction: Eu 2+ + 2e- + 3Pb → EuPb 3 and Sr 2+ + 2e- + 3Pb → SrPb 3 . In the present work these alloy formation reactions were studiedby electrochemical impedance spectroscopy. Analysis of the spectra showed that the electronic exchange of Eu 2+ /Eu and Sr 2+ /Sr is quasi-re-versible. Moreover, the experimental results allowed the determination of the kinetic parameters of EU 2+ /EU and Sr 2+ /Sr, the diffusion coefficients of these species in molten chloride baths, and also the diffusion layer thickness.
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Zheng, Yuanshui; Han, Zhaohui; Driewer, Joseph P.; Low, Daniel A.; Li, H. Harold
2010-01-01
Purpose: The low effective atomic number, reusability, and other computed radiography-related advantages make europium doped potassium chloride (KCl:Eu2+) a promising dosimetry material. The purpose of this study is to model KCl:Eu2+ point dosimeters with a Monte Carlo (MC) method and, using this model, to investigate the dose responses of two-dimensional (2D) KCl:Eu2+ storage phosphor films (SPFs). Methods: KCl:Eu2+ point dosimeters were irradiated using a 6 MV beam at four depths (5–20 cm) for each of five square field sizes (5×5–25×25 cm2). The dose measured by KCl:Eu2+ was compared to that measured by an ionization chamber to obtain the magnitude of energy dependent dose measurement artifact. The measurements were simulated using DOSXYZnrc with phase space files generated by BEAMnrcMP. Simulations were also performed for KCl:Eu2+ films with thicknesses ranging from 1 μm to 1 mm. The work function of the prototype KCl:Eu2+ material was determined by comparing the sensitivity of a 150 μm thick KCl:Eu2+ film to a commercial BaFBr0.85I0.15:Eu2+-based SPF with a known work function. The work function was then used to estimate the sensitivity of a 1 μm thick KCl:Eu2+ film. Results: The simulated dose responses of prototype KCl:Eu2+ point dosimeters agree well with measurement data acquired by irradiating the dosimeters in the 6 MV beam with varying field size and depth. Furthermore, simulations with films demonstrate that an ultrathin KCl:Eu2+ film with thickness of the order of 1 μm would have nearly water-equivalent dose response. The simulation results can be understood using classic cavity theories. Finally, preliminary experiments and theoretical calculations show that ultrathin KCl:Eu2+ film could provide excellent signal in a 1 cGy dose-to-water irradiation. Conclusions: In conclusion, the authors demonstrate that KCl:Eu2+-based dosimeters can be accurately modeled by a MC method and that 2D KCl:Eu2+ films of the order of 1 μm thick would have minimal energy dependence. The data support the future research and development of a KCl:Eu2+ storage phosphor-based system for quantitative, high-resolution multidimensional radiation therapy dosimetry. PMID:20175476
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Molander, Linda; Breitholtz, Magnus; Andersson, Patrik L; Rybacka, Aleksandra; Rudén, Christina
2012-10-01
It is widely acknowledged that the management of risks associated with chemicals in articles needs to be improved. The EU environmental policy states that environmental damage should be rectified at source. It is therefore motivated that the risk management of substances in articles also takes particular consideration to those substances identified as posing a risk in different environmental compartments. The primary aim of the present study was to empirically analyze to what extent the regulation of chemicals in articles under REACH is coherent with the rules concerning chemicals in the Sewage Sludge Directive (SSD) and the Water Framework Directive (WFD). We also analyzed the chemical variation of the organic substances regulated under these legislations in relation to the most heavily used chemicals. The results show that 16 of 24 substances used in or potentially present in articles and regulated by the SSD or the WFD are also identified under REACH either as a substance of very high concern (SVHC) or subject to some restrictions. However, for these substances we conclude that there is limited coherence between the legislations, since the identification as an SVHC does not in itself encompass any use restrictions, and the restrictions in REACH are in many cases limited to a particular use, and thus all other uses are allowed. Only a minor part of chemicals in commerce is regulated and these show a chemical variation that deviates from classical legacy pollutants. This warrants new tools to identify potentially hazardous chemicals in articles. We also noted that chemicals monitored in the environment under the WFD deviate in their chemistry from the ones regulated by REACH. In summary, we argue that to obtain improved resource efficiency and a sustainable development it is necessary to minimize the input of chemicals identified as hazardous to health or the environment into articles. Copyright © 2012 Elsevier B.V. All rights reserved.
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Financial effects of pharmaceutical price regulation on R&D spending by EU versus US firms.
Golec, Joseph; Vernon, John A
2010-01-01
EU countries closely regulate pharmaceutical prices, whereas the US does not. This paper shows how price constraints affect the profitability, stock returns and R&D spending of EU and US firms. Compared with EU firms, US firms are more profitable, earn higher stock returns and spend more on R&D. We tested the relationship between price regulation and R&D spending, and estimated the costs of tight EU price regulation. Although results show that EU consumers enjoyed much lower pharmaceutical price inflation, we estimated that price controls cost EU firms 46 fewer new medicines and 1680 fewer research jobs during our 19-year sample period. Had the US used controls similar to those used in the EU, we estimate it would have led to 117 fewer new medicines and 4368 fewer research jobs in the US.
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Effect of Eu substitution on superconductivity in Ba{sub 8−x}Eu{sub x}Al{sub 6}Si{sub 40} clathrates
DOE Office of Scientific and Technical Information (OSTI.GOV)
Liu, Lihua; Bi, Shanli; Peng, Bailu
2015-05-07
The silicon clathrate superconductor is uncommon as its structure is dominated by strong Si-Si covalent bonds, rather than the metallic bond, that are more typical of traditional superconductors. To understand the influence of large magnetic moment of Eu on superconductivity for type-I clathrates, a series of samples with the chemical formula Ba{sub 8−x}Eu{sub x}Al{sub 6}Si{sub 40} (x = 0, 0.5, 1, and 2) were synthesised in which Eu occupied Ba sites in cage center. With the increase of Eu content, the cubic lattice parameter decreases monotonically signifying continuous shrinkage of the constituting (Ba/Eu)@Si{sub 20} and (Ba/Eu)@Si{sub 24} cages. The temperature dependence ofmore » magnetization at low temperature revealed that Ba{sub 8}Al{sub 6}Si{sub 40} is superconductive with transition temperature at T{sub C} = 5.6 K. The substitution of Eu for Ba results in a strong superconductivity suppression; Eu-doping largely decreases the superconducting volume and transition temperature T{sub C}. Eu atoms enter the clathrate lattice and their magnetic moments break paired electrons. The Curie-Weiss temperatures were observed at 3.9, 6.6, and 10.9 K, respectively, for samples with x = 0.5, 1.0, and 2.0. Such ferromagnetic interaction of Eu can destroy superconductivity.« less
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Fang, C. M.; Biswas, Koushik
2015-07-22
Several rare-earth-doped, heavy-metal halides have recently been identified as potential next-generation luminescent materials with high efficiency at low cost. AB 2I 5:Eu 2+ (A=Li–Cs; B=Sr, Ba) is one such family of halides. Its members, such as CsBa 2I 5:Eu 2+ and KSr 2I 5:Eu 2+, are currently being investigated as high-performance scintillators with improved sensitivity, light yield, and energy resolution less than 3% at 662 keV. Within the AB 2I 5 family, our first-principles-based calculations reveal two remarkably different trends in Eu site occupation. The substitutional Eu ions occupy both eightfold-coordinated B1(VIII) and the sevenfold-coordinated B2(VII) sites in the Sr-containingmore » compounds. However, in the Ba-containing crystals, Eu ions strongly prefer the B2(VII)sites. This random versus preferential distribution of Eu affects their electronic properties. The calculations also suggest that in the Ba-containing compounds one can expect the formation of Eu-rich domains. These results provide atomistic insight into recent experimental observations about the concentration and temperature effects in Eu-doped CsBa 2I 5. We discuss the implications of our results with respect to luminescent properties and applications. We also hypothesize Sr, Ba-mixed quaternary iodides ABa VIIISr VIII 5:Eu as scintillators having enhanced homogeneity and electronic properties.« less
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NASA Astrophysics Data System (ADS)
Seth, Pooja; Swati, G.; Haranath, D.; Rao, S. M. D.; Aggarwal, Shruti
2018-07-01
Europium (Eu) doped LiF crystals have been grown by the Edge-defined film fed growth (EFG) technique. The designing and installation of the furnace used for the growth of the crystals have been discussed in detail. In the present study, Eu (Eu2O3) has been doped in LiF in different concentration (0.02-0.2 wt %). X-ray diffractometry (XRD) and Energy Dispersive X-ray (EDX) spectroscopy confirms the incorporation of Eu in LiF. The influence of Eu on LiF has been investigated through photoluminescence (PL), thermoluminescence (TL) and electron paramagnetic resonance (EPR) in as-grown and annealed crystals. PL emission spectra shows the presence of both Eu3+ and Eu2+ form in the as-grown crystals which is confirmed by EPR results. Whereas, in annealed crystals, Eu is present predominantly as Eu2+ form. This suggests that growing crystals at high temperature (∼900 °C) in argon gas atmosphere through EFG technique favours the reduction of Eu3+ → Eu2+. This reduction phenomenon has been explained on the basis of charge compensation model. TL study of the LiF: Eu (0.02-0.2 wt %) crystals has been done after irradiation with Co60 gamma rays. In this study, it has been observed that the TL intensity as well as glow curve structure of LiF: Eu crystals are a strong function of Eu concentration. The maximum TL is observed at Eu concentration of 0.05 wt% at which a well defined glow curve structure with a prominent peak at 185 °C and a small peak at 253 °C. Beyond this concentration (0.05 wt %), TL intensity decreases due to aggregation of defects in the host. The peak at 185 °C in LiF: Eu (0.05 wt %) is certainly due to the presence of Eu2+ associated defects which is also supported by the PL spectra. It has been observed that Eu doping have a key role in creation of more defect levels which lead to the increased number of electron and hole traps. Further, trapping parameters are analysed using glow curve deconvolution method to have an insight study of TL phenomena. Further, TL glow curve structure of as-grown and annealed crystal are distinct which may be attributed to the nature of defect traps formed inside the LiF.
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E-Commerce and Security Governance in Developing Countries
NASA Astrophysics Data System (ADS)
Sanayei, Ali.; Rajabion, Lila
Security is very often mentioned as one of the preconditions for the faster growth of e-commerce. Without a secure and reliable internet, customer will continue to be reluctant to provide confidential information online, such as credit card number. Moreover, organizations of all types and sizes around the world rely heavily on technologies of electronic commerce (e-commerce) for conducting their day-to-day business transaction. Providing organizations with a secure e-commerce environment is a major issue and challenging one especially in Middle Eastern countries. Without secure e-commerce, it is almost impossible to take advantage of the opportunities offered by e-commerce technologies. E-commerce can create opportunities for small entrepreneurs in Middle Eastern countries. This requires removing infrastructure blockages in telecommunications and logistics alongside the governance of e-commerce with policies on consumer protection, security of transactions, privacy of records and intellectual property. In this paper, we will explore the legal implications of e-commerce security governance by establishing who is responsible for ensuring compliance with this discipline, demonstrating the value to be derived from information security governance, the methodology of applying information security governance, and liability for non-compliance with this discipline. Our main focus will be on analyzing the importance and implication of e-commerce security governance in developing countries.
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29 CFR 779.103 - Employees “engaged in commerce.”
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Employees âengaged in commerce.â 779.103 Section 779.103... and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.103 Employees “engaged in commerce.” Employees are “engaged in commerce” within the meaning of the Act...
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29 CFR 779.103 - Employees “engaged in commerce.”
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Employees âengaged in commerce.â 779.103 Section 779.103... and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.103 Employees “engaged in commerce.” Employees are “engaged in commerce” within the meaning of the Act...
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29 CFR 779.103 - Employees “engaged in commerce.”
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Employees âengaged in commerce.â 779.103 Section 779.103... and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.103 Employees “engaged in commerce.” Employees are “engaged in commerce” within the meaning of the Act...
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29 CFR 779.103 - Employees “engaged in commerce.”
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Employees âengaged in commerce.â 779.103 Section 779.103... and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.103 Employees “engaged in commerce.” Employees are “engaged in commerce” within the meaning of the Act...
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29 CFR 779.103 - Employees “engaged in commerce.”
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Employees âengaged in commerce.â 779.103 Section 779.103... and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.103 Employees “engaged in commerce.” Employees are “engaged in commerce” within the meaning of the Act...
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An Exploratory Investigation of Requisite Skills Needed by Developers of E-Commerce Systems.
ERIC Educational Resources Information Center
Aladwani, Adel M.
The aim of this exploratory study is to identify the skills needed by developers of Electronic Commerce (e-Commerce) systems. The paper proposes a framework pertaining to three categories of e-Commerce development knowledge: technical, human, and organizational. The initial findings reveal that there are some 16 possible e-Commerce skills tapping…
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Cybersecurity: Authoritative Reports and Resources
2013-07-25
Breaches: Is Federal Legislation Needed to Protect Consumers ? July 18, 2013 Energy and Commerce Commerce , Manufacturing and Trade Evaluating Privacy...and Commerce Commerce , Manufacturing and Trade Reporting Data Breaches: Is Federal Legislation Needed to Protect Consumers ? July 18, 2013 Energy... Consumer Credit Cybersecurity: An Overview of Risks to Critical Infrastructure July 26, 2011 Energy and Commerce Oversight and Investigations
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Cybersecurity: Authoritative Reports and Resources
2013-10-25
Security Technologies Reporting Data Breaches: Is Federal Legislation Needed to Protect Consumers ? July 18, 2013 Energy and Commerce Commerce ...Protect Consumers ? July 18, 2013 Energy and Commerce Oversight and Investigation Cyber Espionage and the Theft of U.S. Intellectual Property and...protection for sensitive consumer data and timely notification in case of breach June 15, 2011 Energy and Commerce Commerce , Manufacturing, and
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29 CFR 776.21 - “For” commerce.
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false âForâ commerce. 776.21 Section 776.21 Labor Regulations... Goods for Commerceâ § 776.21 “For” commerce. (a) General principles. As has been made clear previously, where “goods” (as defined in the Act) are produced “for commerce,” every employee engaged in the...
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29 CFR 776.21 - “For” commerce.
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false âForâ commerce. 776.21 Section 776.21 Labor Regulations... Goods for Commerceâ § 776.21 “For” commerce. (a) General principles. As has been made clear previously, where “goods” (as defined in the Act) are produced “for commerce,” every employee engaged in the...
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NASA Astrophysics Data System (ADS)
Guo, Ning; Liang, Qimeng; Li, Shuo; Ouyang, Ruizhuo; Lü, Wei
2017-11-01
A family of apatite-type fluorophosphate phosphors with general formula Sr3Gd(1-m-n)Na(PO4)3F:mTb3+,nEu3+ (SGN:mTb3+,nEu3+) have been synthesized via the high-temperature solid-state reaction method. Triple energy transfer processes from Gd3+ in the host to both Tb3+ and Eu3+, as well as from Tb3+ to Eu3+ have been verified by the photoluminescence spectra. Under the excitation of UV light, both green line from the transitions of Tb3+ and red line origin from the transitions of Eu3+ have been simultaneously observed in a single phase phosphor, which makes a promise for tunable color emissions from yellowish-green through yellow and ultimately to reddish-orange by simply adjusting the Eu3+ content (n) in SGN:0.20Tb3+,nEu3+ phosphors. Additionally, the energy transfer from the Tb3+ to the Eu3+ ions has been demonstrated to be a resonant type via a quadrupole-quadrupole mechanism based on the Dexter's theoretical model, and the energy transfer efficiency increases with an increase in Eu3+ concentration.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Im, Hee-Jung, E-mail: imhj@kaeri.re.kr; Park, Kyoung Kyun; Jung, Euo Chang
2014-10-15
Highlights: • Enhanced adsorption of Eu(III) and U(VI) onto TiO{sub 2}-coated silica. • Enhanced Eu(III) luminescence and lifetime on TiO{sub 2}-coated silica. • Energy transfer from TiO{sub 2} of TiO{sub 2}-coated silica to Eu(III) in solutions. - Abstract: To determine the effects of TiO{sub 2} on the adsorption of actinides onto mineral surfaces in groundwater, silica was partially coated with TiO{sub 2}, and Eu(III) and U(VI) were individually adsorbed from separate 0.1 mM concentration solutions. The TiO{sub 2}-coated silica showed higher Eu(III) and U(VI) adsorption capacities for increasing amounts of TiO{sub 2} coated on the silica surfaces, and thus themore » existence of TiO{sub 2} can decrease the mobility of Eu(III) and U(VI) contaminants. In luminescence studies, it was found that TiO{sub 2} considerably enhanced the luminescence of the adsorbed Eu(III) indicating that TiO{sub 2}–Eu(III) forms surface complexes which may decrease the number of water molecules at the inner sphere of Eu(III), but this was not observed for U(VI). An energy transfer from the TiO{sub 2} to the Eu(III) was confirmed in this case of amorphous TiO{sub 2}-coated silica in Eu(III) solutions, and an increase of the luminescence lifetime of Eu(III) for increasing concentrations of coated TiO{sub 2} was also observed.« less
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75 FR 72792 - Commerce Spectrum Management Advisory Committee Meeting
Federal Register 2010, 2011, 2012, 2013, 2014
2010-11-26
... DEPARTMENT OF COMMERCE National Telecommunications and Information Administration Commerce Spectrum Management Advisory Committee Meeting AGENCY: National Telecommunications and Information... comments may be mailed to Commerce Spectrum Management Advisory Committee, National Telecommunications and...
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In Situ Trace Element Measurements on Roda and the Origin of Diogenites
NASA Technical Reports Server (NTRS)
Mittlefehldt, David W.; Herrin, J. S.
2011-01-01
The origin of diogenites remains poorly understood. A recent model interprets many diogenites to have been formed from melts that were derived by remelting initial magma ocean cumulates, and these penultimate parent melts were then contaminated by melts derived from remelting of the basaltic (eucritic) crust to form the ultimate diogenite parent melts [1] (hereafter the remelting model). This is a very complicated petrogenesis that has profound implications for the geological evolution of 4 Vesta if correct. This model was developed based on trace element analyses of bulk rock samples that had been leached in acids to remove phosphates; the compositions of the residues were interpreted to be close to those of cumulus orthopyroxenes plagioclase, chromite and olivine [1]. In situ measurements of phases in diogenites can be used to test this model. We have begun a campaign of laser ablation ICP-MS of orthopyroxene grains in diogenites for this purpose. Here we report our first results on one diogenite, Roda. We have determined a suite of trace lithophile elements on nine, mm-sized pyroxene grains separated from Roda that have previously been studied [2, 3]. A key observation supporting the remelting model is the very low Eu/Eu* of leached residues; values too low to represent orthopyroxene that crystallized from melts with chondritic Sm/Eu and Gd/Eu [1]. (Eu* = Eu interpolated from REE diagrams.) Crustal remelts have low Sm/Eu and Gd/Eu, and orthopyroxenes that crystallized from parent melts contaminated by them would have very low Eu/Eu* [1]. Roda grains have Eu/Eu* of 0.243 to 0.026; the latter a value lower than any measured on bulk diogenite leached residues (0.041) [1]. There is a general negative correlation between Eu/Eu* and some incompatible elements (Zr, Nb, Hf), but not others (LREE). This appears inconsistent with the remelting model as it would suggest an evolving parent melt with La de-creasing as Zr increased and Eu/Eu* decreased. Grain R-15 includes trace-element-rich trapped melt phases [2, 3]. This grain has the highest Eu/Eu* and LREE contents, indicating that the trapped melt had a high Eu/Eu*. Thus, our first data on one diogenite do not provide support for the remelting model [1]. Roda is unusual in that its orthopyroxene grains show wide ranges in trace element contents [4]. Previous in situ REE analyses of grain R-15 did not reveal evidence for subsolidus equilibration with trace-element-rich trapped melt phases, and led to the suggestion that Roda may be polymict, with different grains representing different lithologies of diverse compositions [3]. Thus, based on our results on Roda, it is perhaps premature to abandon the remelting model. In situ measurements on a suite of diogenites is planned to further address this issue.
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Observation of unusual critical region behavior in the magnetic susceptibility of EuSe
NASA Astrophysics Data System (ADS)
Bykovetz, N.; Klein, J.; Lin, C. L.
2018-05-01
The Europium Chalcogenides (EuCh: EuO, EuS, EuSe, and EuTe) have been regarded as model examples of simple, cubic, Heisenberg exchange coupled magnetic systems, with a ferromagnetic nearest-neighbor exchange constant J1 and an antiferromagnetic next-nearest-neighbor constant J2. Unlike the other EuCh, EuSe exhibits a range of complex magnetic behaviors, the latter being attributed to EuSe being near the point where J2=-J1, where its magnetism appears to consist of nearly de-coupled 2D ferromagnetic sheets. Analysis of precision SQUID measurements of the magnetic susceptibility χ in EuSe showed that in the region from ˜Tc to ˜2Tc, a fit of the data to the critical equation χ = χ2Tc(T/Tc-1)-γ gives γ=2.0, an exponent not predicted by any current theory. Additionally, this fit predicts that Tc should be ˜0K. We tentatively interpret this by saying that in the paramagnetic region the system "thinks" EuSe should not order above T=0. Tc=0K is predicted by the Mermin-Wagner theorem (MW) for Heisenberg-coupled 2D magnetic systems, and we can show that when J2=-J1, MW can also be applied to the J1, J2 exchange model of the EuCh to give a rigorous Tc=0 prediction. Under 10 kbar applied pressure EuSe exhibits a different γ and fitted Tc. An additional, and rather strange, critical-region effect was discovered. The EuSe sample was found to exhibit a relaxation effect in a small range of temperatures, just above and just below the actual Tc of 4.7K, with time constants of up to 5 minutes. We cannot yet fully explain this observed macroscopic effect.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Song, Yue; Liu, Quansheng, E-mail: liuqs@cust.edu.cn; School of Physics, JiLin University, No. 2699 Qianjin Street, Changchun 130012
2013-10-15
Graphical abstract: - Highlights: • The concentration quenching mechanism of Sr{sub 3}B{sub 2}O{sub 6}:Eu{sup 2+}can be interpreted by the dipole–dipole (d–d) interaction of Eu{sup 2+} ions. • The average electronegativity of O{sup 2−} ions located around Eu{sup 2+} ion is 1.9991 eV. • The optimum concentration of Eu{sup 2+} ions in Sr{sub 3}B{sub 2}O{sub 6} is 7 mol%. • Sr{sub 3}B{sub 2}O{sub 6}:Eu{sup 2+} is a hexagonal crystal structure. - Abstract: The Sr{sub 3}B{sub 2}O{sub 6}:Eu{sup 2+} yellow phosphors were synthesized by high-temperature solid state reaction method. The crystal structure and optical properties of the Sr{sub 3}B{sub 2}O{sub 6}:Eu{sup 2+}more » phosphor was studied. Results indicate that Sr{sub 3}B{sub 2}O{sub 6}:Eu{sup 2+} has a hexagonal crystal structure. The excitation spectrum indicates that this phosphor can be effectively excited by ultraviolet light of near 390 nm and blue light of 460 nm. The emission spectrum shows a intense broad band spectrum peaking at 566 nm, which corresponds to the 4f{sup 6}({sup 7}F)5d ({sup 2}e{sub g})→{sup 8}S{sub 7/2} (4f{sup 7})transition of Eu{sup 2+} ion. The excitation spectrum is a broad asymmetric excitation band extending from 300 nm to 500 nm and the main excitation peak is at 468 nm. The average electronegativity of O{sup 2−} ions located around Eu{sup 2+} ion is 1.9991 eV. The optimum concentration of Eu{sup 2+} is 7 mol%. The concentration quenching mechanism can be interpreted by the dipole–dipole (d–d) interaction of Eu{sup 2+} ions.« less
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Li, Ling; Noh, Hyeon Mi; Liu, Xiaoguang; Moon, Byung Kee; Choi, Byung Chun; Jeong, Jung Hyun
2015-07-01
Well-crystallized nanorod bundles Ln4O(OH)9NO3:1%Eu(Ln = Y, Lu) have been successfully prepared by hydrothermal method. The crystalline phase, size and optical properties were characterized using powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), infrared (IR) spectrograph and photoluminescent (PL) spectra. Site occupations of Eu3+ in crystals Ln4O(OH)9NO3:Eu(Ln = Y, Lu) were discussed based on excitation spectra and the empirical relationship formula between the charge transfer (CT) energy and the environmental factor. The emission spectra exhibited that the strongest emission peaks with an excitation wavelength of 395 nm were at 617 and 626 nm in crystal Lu4O(OH)9NO3:1%Eu and Y4O(OH)9NO3:1%Eu, respectively, both of which come from 5D0-7F2 transition of the Eu3+ ions. The broad excitation peaks at about 254 and 255 nm were found when monitored at 617 and 628 nm in crystal Lu4O(OH)9NO3:1%Eu and Y4O(OH)9NO3:1%Eu, respectively, which were due to O-Eu CT transition. Based on the dielectric theory of complex crystal, the CT bands at about 254 and 255 nm in Ln4O(OH)9NO3:1%Eu(Ln = Y, Lu) were assigned to the transition of O-Eu at Ln3(Ln = Y, Lu) site, from which we can conclude that Eu3+ ions occupied the site of Ln3(Ln = Y, Lu) in crystal Ln4O(OH)9NO3:1%Eu(Ln = Y, Lu). It put forward a new route to investigate site occupation of luminescent center ions in rare earth doped complex inorganic luminescence materials.
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Chen, Min-Hua; Yoshioka, Tomohiko; Ikoma, Toshiyuki; Hanagata, Nobutaka; Lin, Feng-Huei; Tanaka, Junzo
2014-10-01
Theranostic nanoparticles currently have been regarded as an emerging concept of 'personalized medicine' with diagnostic and therapeutic dual-functions. Eu 3+ doped hydroxyapatite (HAp) has been regarded as a promising fluorescent probe for in vivo imaging applications. Additionally, substitution of Ca 2+ with Fe 3+ in HAp crystal may endow the capability of producing heat upon exposure to a magnetic field. Here we report a preliminary study of doping mechanism and photoluminescence of Eu 3+ and Fe 3+ doped HAp nanoparticles (Eu/Fe:HAp). HAp with varied concentration of Eu 3+ and Fe 3+ doping are presented as Eu(10 mol%):HAp, Eu(7 mol%)-Fe(3 mol%):HAp, Eu(5 mol%)-Fe(5 mol%):HAp, Eu(3 mol%)-Fe(7 mol%):HAp, and Fe(10 mol%):HAp in the study. The results showed that the HAp particles, in nano-size with rod-like morphology, were successfully doped with Eu 3+ and Fe 3+ , and the particles can be well suspended in cell culture medium. Photoluminescence analysis revealed that particles have prominent emissions at 536 nm, 590 nm, 615 nm, 650 nm and 695 nm upon excitation at a wavelength of 397 nm. Moreover, these Eu/Fe:HAp nanoparticles belonged to B-type carbonated HAp, which has been considered an effective biodegradable and biocompatible drug/gene carrier in biological applications.
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Sorption of Eu(III) on attapulgite studied by batch, XPS, and EXAFS techniques.
Fan, Q H; Tan, X L; Li, J X; Wang, X K; Wu, W S; Montavon, G
2009-08-01
The effects of pH, ionic strength, and temperature on sorption of Eu(III) on attapulgite were investigated in the presence and absence of fulvic acid (FA) and humic acid (HA). The results indicated that the sorption of Eu(III) on attapulgite was strongly dependent on pH and ionic strength, and independent of temperature. In the presence of FA/HA, Eu(III) sorption was enhanced at pH < 4, decreased at pH range of 4-6, and then increased again at pH > 7. The X-ray photoelectron spectroscopy (XPS) analysis suggested that the sorption of Eu(III) might be expressed as is identical to X3Eu0, is identical to S(w)OHEu3+, and is identical to SOEu-OOC-/HA in the ternary Eu/HN/attapulgite system. The extended X-ray absorption fine structure (EXAFS) analysis of Eu-HA complexes indicated that the distances of d(Eu-O) decreased from 2.415 to 2.360 angstroms with increasing pH from 1.76 to 9.50, whereas the coordination number (N) decreased from approximately 9.94 to approximately 8.56. Different complexation species were also found for the different addition sequences of HA and Eu(III) to attapulgite suspension. The results are important to understand the influence of humic substances on Eu(III) behavior in the natural environment.
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NASA Astrophysics Data System (ADS)
Chen, Min-Hua; Yoshioka, Tomohiko; Ikoma, Toshiyuki; Hanagata, Nobutaka; Lin, Feng-Huei; Tanaka, Junzo
2014-10-01
Theranostic nanoparticles currently have been regarded as an emerging concept of ‘personalized medicine’ with diagnostic and therapeutic dual-functions. Eu3+ doped hydroxyapatite (HAp) has been regarded as a promising fluorescent probe for in vivo imaging applications. Additionally, substitution of Ca2+ with Fe3+ in HAp crystal may endow the capability of producing heat upon exposure to a magnetic field. Here we report a preliminary study of doping mechanism and photoluminescence of Eu3+ and Fe3+ doped HAp nanoparticles (Eu/Fe:HAp). HAp with varied concentration of Eu3+ and Fe3+ doping are presented as Eu(10 mol%):HAp, Eu(7 mol%)-Fe(3 mol%):HAp, Eu(5 mol%)-Fe(5 mol%):HAp, Eu(3 mol%)-Fe(7 mol%):HAp, and Fe(10 mol%):HAp in the study. The results showed that the HAp particles, in nano-size with rod-like morphology, were successfully doped with Eu3+ and Fe3+, and the particles can be well suspended in cell culture medium. Photoluminescence analysis revealed that particles have prominent emissions at 536 nm, 590 nm, 615 nm, 650 nm and 695 nm upon excitation at a wavelength of 397 nm. Moreover, these Eu/Fe:HAp nanoparticles belonged to B-type carbonated HAp, which has been considered an effective biodegradable and biocompatible drug/gene carrier in biological applications.
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Pyrolytic synthesis and luminescence of porous lanthanide Eu-MOF.
Jin, Guangya; Liu, Zhijian; Sun, Hongfa; Tian, Zhiyong
2016-02-01
A lanthanide metal coordination polymer [Eu2(BDC)3(DMSO)(H2O)] was synthesized by the reaction of europium oxide with benzene-1,3-dicarboxylic acid (H2BDC) in a mixed solution of dimethyl sulfoxide (DMSO) and water under hydrothermal conditions. The crystal structure of Eu2(BDC)3(DMSO)(H2O) was characterized by X-ray diffraction (XRD). Thermo-gravimetric analysis of Eu2(BDC)3(DMSO)(H2O) indicated that coordinated DMSO and H2O molecules could be removed to create Eu2(BDC)3(DMSO)(H2O)-py with permanent microporosity, which was also verified by powder XRD (PXRD) and elemental analysis. Both Eu2(BDC)3(DMSO)(H2O) and Eu2(BDC)3(DMSO)(H2O)-py showed mainly Eu-based luminescence and had characteristic emissions in the range 550-700 nm. Copyright © 2015 John Wiley & Sons, Ltd.
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Hess, Sebastian; Johansson, Helena
2017-01-01
Based on a discrete choice experiment with 336 consumers, this study investigated whether the consumer propensity to choose a simplified European Union (EU) vs. non-EU denomination of origin for beef, instead of a specific country-of-origin (COO) denomination, depends upon the amount and type of credence information provided to the individual. The likelihood of choosing the EU/non-EU denomination of origin depended on the total number of other labelling credence attributes provided and also on the type of detailed credence attributes present in the choice. The presence of cues relating to animal welfare and far-reaching traceability had the highest likelihood of influencing the choice of the EU/non-EU denomination of origin. The compensatory qualities of each credence attribute in relation to the EU/non-EU origin denomination thus differed. PMID:28946674
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The Oxidation State of Europium in Halide Glasses
Weber, J.K.R.; Vu, M.; Paßlick, C.; Schweizer, S.; Brown, D.E.; Johnson, C.E.; Johnson, J.A.
2012-01-01
The luminescent properties of divalent europium ions can be exploited to produce storage phosphors for x-ray imaging applications. The relatively high cost and limited availability of divalent europium halides makes it desirable to synthesize them from the readily available trivalent salts. In this work, samples of pure EuCl3 and fluoride glass melts doped with EuCl3 were processed at 700-800 °C in an inert atmosphere furnace. The Eu oxidation state in the resulting materials was determined using fluorescence and Mössbauer spectroscopy. Heat treatment of pure EuCl3 for 10 minutes at 710 °C resulted in a material comprising approximately equal amounts of Eu2+ and Eu3+. Glasses made using mixtures of EuCl2 and EuCl3 in the starting material contained both oxidation states. This paper describes the sample preparation and analysis and discusses the results in the context of chemical equilibria in the melts. PMID:22101252
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Krishnamurthy, Vemuru; Lang, J. C.; Haskel, D.
2007-03-01
We combine x-ray magnetic circular dichroism spectroscopy at Fe L-2,L-3 edges, at Eu M-4,M-5 edges, x-ray absorption spectroscopy (XAS) investigation of Eu valence, and local spin density calculations, to show that the filled skutterudite Eu0.95Fe4Sb12 is a ferrimagnet in which the Fe 3d moment and the Eu2+ 4f moment are magnetically ordered with dominant antiferromagnetic coupling. From Eu L-3 edge XAS, we find that about 13% of the Eu have a formal valence of 3+. We ascribe the origin of ferrimagnetism at a relatively high transition temperature T-C of 85 K in Eu0.95Fe4Sb12 to f-electron interaction with the nearly ferromagneticmore » [Fe4Sb12](2.2-) host lattice.« less
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false Notice to Department of Commerce organizational units of implementation and procedures. 23.7 Section 23.7 Commerce and Foreign Trade Office of the Secretary of Commerce USE OF PENALTY MAIL IN THE LOCATION AND RECOVERY OF MISSING CHILDREN § 23.7 Notice to...
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29 CFR 779.104 - Employees “engaged in the production of goods for commerce.”
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Employees âengaged in the production of goods for commerce... Apply: Basic Principles and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.104 Employees “engaged in the production of goods for commerce.” The activities...
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29 CFR 779.104 - Employees “engaged in the production of goods for commerce.”
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Employees âengaged in the production of goods for commerce... Apply: Basic Principles and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.104 Employees “engaged in the production of goods for commerce.” The activities...
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29 CFR 779.104 - Employees “engaged in the production of goods for commerce.”
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Employees âengaged in the production of goods for commerce... Apply: Basic Principles and Individual Coverage Employees Engaged in Commerce Or in the Production of Goods for Commerce § 779.104 Employees “engaged in the production of goods for commerce.” The activities...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false Notice to Department of Commerce organizational units of implementation and procedures. 23.7 Section 23.7 Commerce and Foreign Trade Office of the Secretary of Commerce USE OF PENALTY MAIL IN THE LOCATION AND RECOVERY OF MISSING CHILDREN § 23.7 Notice to...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false Notice to Department of Commerce organizational units of implementation and procedures. 23.7 Section 23.7 Commerce and Foreign Trade Office of the Secretary of Commerce USE OF PENALTY MAIL IN THE LOCATION AND RECOVERY OF MISSING CHILDREN § 23.7 Notice to...
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Kwon, Ki Hyuk; Im, Won Bin; Jang, Ho Seong; Yoo, Hyoung Sun; Jeon, Duk Young
2009-12-21
On the basis of the structural information that the host material has excellent charge stabilization, blue-emitting Ca(6-x-y)Mg(x)(PO(4))(4):Eu(y)(2+) (CMP:Eu(2+)) phosphors were synthesized and systematically optimized, and their photoluminescence (PL) properties were evaluated. Depending upon the amount of Mg added, the emission efficiency of the phosphors could be enhanced. The substitution of Eu(2+) affected their maximum wavelength (lambda(max)) and thermal stability because the substitution site of Eu(2+) could be varied. To obtain single-phase two-color-emitting phosphors, we incorporated Mn(2+) into CMP:Eu(2+) phosphors. Weak red emission resulting from the forbidden transition of Mn(2+) could be enhanced by the energy transfer from Eu(2+) to Mn(2+) that occurs because of the spectral overlap between the photoluminescence excitation (PLE) spectrum of Mn(2+) and the PL spectrum of Eu(2+). The energy transfer process was confirmed by the luminescence spectra, energy transfer efficiency, and decay curve of the phosphors. Finally, the optimized Ca(6-x-y)Mg(x-z)(PO(4))(4):Eu(y)(2+),Mn(z)(2+) (CMP:Eu(2+),Mn(2+)) phosphors were applied with green emitting Ca(2)MgSi(2)O(7):Eu(2+) (CMS:Eu(2+)) phosphors to ultraviolet (UV) light emitting diode (LED)-pumped white LEDs. The CMS:Eu(2+)-mixed CMP:Eu(2+), Mn(2+)-based white LEDs showed an excellent color rendering index (CRI) of 98 because of the broader emission band and more stable color coordinates than those of commercial Y(3)Al(5)O(12):Ce(3+) (YAG:Ce(3+))-based white LEDs under a forward bias current of 20 mA. The fabricated white LEDs showed very bright natural white light that had the color coordinate of (0.3288, 0.3401), and thus CMP:Eu(2+),Mn(2+) could be regarded as a good candidate for UV LED-based white LEDs.
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29 CFR 776.1 - General interpretative guides.
Code of Federal Regulations, 2010 CFR
2010-07-01
... commerce and the channels and instrumentalities of commerce to be used to perpetuate such labor conditions... commerce and the free flow of goods in commerce and (e) interferes with the orderly and fair marketing of...
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NASA Astrophysics Data System (ADS)
Cao, Shiwei; Jiao, Yang; Han, Weifang; Ge, Chunhua; Song, Bo; Wang, Jie; Zhang, Xiangdong
2018-02-01
4ZnO·B2O3·H2O:Ln3 + (Ln = Eu, Tb) phosphors with different morphologies have been successfully synthesized via one-step hydrothermal method through regulating the molar amount of Eu3 + and Tb3 +. Comprehensive scanning electron microscopy (SEM), X-ray diffraction (XRD) Fourier transform infrared spectrum (FT-IR) and inductively coupled plasma atomic emission spectrometer (ICP-AES) characterizations all confirm that obtained products are 4ZnO·B2O3·H2O:Ln3 + (Ln = Eu, Tb). The experimental results displayed that the morphology and photoluminescence of compounds is regularly changed with increased the molar amount of rare earth ions. For the Eu3 +-doped, Tb3 +-doped and Eu3 +/Tb3 + co-doped 4ZnO·B2O3·H2O phosphors of morphologies, the rod-like structures gradually changed to flower-like structures, fine wire-like structure and hybrid structure, respectively. To their photoluminescence, the Eu3 + shows a red emission (615 nm); the Tb3 + shows a green emission (545 nm); for the Eu3 +/Tb3 + co-doped 4ZnO·B2O3·H2O phosphors, a combination of blue (5d-4f of Eu2 +), green (5D4-7F5 of Tb3 +) and red (5D0-7F2 of Eu3 +) emissions emerges to achieve white emission. In addition, the energy transfer among Eu3 +, Eu2 + and Tb3 + ions was also discussed.
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Mescoli, Elsa
2018-01-01
Following the financial and economic crisis, welfare policies across the EU are increasingly becoming instruments for limiting the mobility of certain EU migrants. In this article, we focus on EU citizens who see their freedom of movement in the EU being restricted after they have applied for social assistance or unemployment benefits in their country of residence. Doing so, we conceptualize undocumented EU migration by means of the concepts of ‘non-deportability’, ‘deservingness’ and ‘precariousness’. Overall, this article – based on ethnographic fieldwork conducted with Italian migrants in Belgium – expands our understanding of undocumented migration by demonstrating how arbitrary and intimidating bureaucratic processes undermine the exercise of EU citizenship. PMID:29899582
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NASA Astrophysics Data System (ADS)
Hinatsu, Yukio; Doi, Yoshihiro; Wakeshima, Makoto
2018-06-01
Magnetic properties of europium-containing compounds Eu3MO7 (M = Nb, Ta, Ir) with fluorite-related structure have been investigated. Magnetic susceptibility measurements show that all these compounds are paramagnetic and have no magnetic ordering down to 1.8 K. At very low temperatures (T<50 K), the susceptibilities of each compound attain constant values, which is characteristic of the ground state for Eu3+ ions. The results of 151Eu Mössbauer spectroscopic measurements show that the asymmetric parameter for Eu(2) in seven-coordination is much larger than that for Eu(1) in cubic environment, which in accordance with the crystallographic result.
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Enhanced luminescence in Eu-doped ZnO nanocrystalline films
DOE Office of Scientific and Technical Information (OSTI.GOV)
Suzuki, Keigo, E-mail: ksuzuki@murata.com; Murayama, Koji; Tanaka, Nobuhiko
We found an enhancement of Eu{sup 3+} emissions in Eu-doped ZnO nanocrystalline films fabricated by microemulsion method. The Eu{sup 3+} emission intensities were increased by reducing annealing temperatures from 633 K to 533 K. One possible explanation for this phenomenon is that the size reduction enhances the energy transfer from ZnO nanoparticles to Eu{sup 3+} ions. Also, the shift of the charge-transfer band into the low-energy side of the absorption edge is found to be crucial, which seems to expedite the energy transfer from O atoms to Eu{sup 3+} ions. These findings will be useful for the material design of Eu-doped ZnOmore » phosphors.« less
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Varying Eu2+ magnetic order by chemical pressure in EuFe2(As1-xPx)2
NASA Astrophysics Data System (ADS)
Zapf, S.; Wu, D.; Bogani, L.; Jeevan, H. S.; Gegenwart, P.; Dressel, M.
2011-10-01
Based on low-field magnetization measurements on a series of single crystals, we present a scheme of the Eu2+ spin alignment in EuFe2(As1-xPx)2. We explain observations of the Eu2+ ordering previously reported, reconciling different existing phase diagrams. The magnetic moments of the Eu2+ ions are slightly canted, yielding a ferromagnetic contribution along the c direction that becomes stronger with pressure, until superconductivity sets in. The spin-density wave as well as the superconducting phase coexist with an antiferromagnetic interlayer coupling of the canted spins. Reducing the interlayer distance finally leads to a ferromagnetic Eu2+ interlayer coupling and to the suppression of superconductivity.
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Irfanullah, Mir; Bhardwaj, Navneet; Chowdhury, Arindam
2016-08-02
Water dispersible citrate-capped LaF3:Eu(5%) nanocrystals (NCs) have been partially surface-functionalized by 1,10-phenanthroline (phen) via a ligand exchange method to produce novel water dispersed citrate/phen-capped LaF3:Eu(5%) NCs in which citrate ligands preserve the water dispersibility of the NCs and phen ligands act as sensitizers of surface Eu(3+)-dopant sites. The partial ligand exchange and the formation of water dispersed NCs have been monitored by (1)H NMR spectroscopy, as well as luminescence measurements at different time intervals during the reaction. These NCs display a distinct phen-sensitized Eu(3+)-emission profile with enhanced intensity in water as compared to the emission profile and intensity obtained upon direct excitation. Time-resolved (or time-gated) emission spectroscopy (TRES) has been used to probe PL dynamics of Eu(3+)-sites of LaF3:Eu(5%) NCs by taking advantage of selectively sensitizing surface Eu(3+)-dopant sites by phen ligands as well as by exciting all the Eu(3+)-sites in the NCs upon direct excitation. TRES upon direct excitation of the citrate-capped LaF3:Eu(5%) NCs reveals that Eu(3+)-dopants occupy at least three different sites, each with a different emission profile and lifetime, and emission from purely interior Eu(3+)-sites has been resolved due to their long lifetime as compared to the lifetime of purely surface and near surface Eu(3+)-sites. In contrast, the phen-sensitized emission from citrate/phen-capped LaF3:Eu(5%) NCs displays similar emission profiles and lifetimes in TRES measurements, which reveal that phen truly sensitizes purely surface dopant sites of the NCs in water, all of which have nearly the same local environment. The phen-sensitized Eu(3+)-emission of the NCs in water remains stable even upon addition of various buffer solutions at physiological pH, as well as upon addition of water-miscible organic solvents. Furthermore, the two-photon excitation (λex. = 720 nm) of these water-soluble phen-capped NCs produces bright red Eu(3+) emission, which reveals that these NCs are promising for potential applications in biological imaging.
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Eu(III) complexes as Anion-responsive Luminescent Sensors and PARACEST Agents
Hammell, Jacob; Buttarazzi, Leandro; Huang, Ching-Hui; Morrow, Janet R.
2011-01-01
The Eu(III) complex of (1S,4S,7S,10S)-1,4,7,10-tetrakis(2-hydroxypropyl)-1,4,7,10-tetraazacyclododecane (S-THP) is studied as a sensor for biologically relevant anions. Anion interactions produce changes in the luminescence emission spectrum of the Eu(III) complex, in the 1H NMR spectrum, and correspondingly, in the PARACEST spectrum of the complex (PARACEST = paramagnetic chemical exchange saturation transfer). Direct excitation spectroscopy and luminescence lifetime studies of Eu(S-THP) give information about the speciation and nature of anion interactions including carbonate, acetate, lactate, citrate, phosphate and methylphosphate at pH 7.2. Data is consistent with the formation of both innersphere and outersphere complexes of Eu(S-THP) with acetate, lactate and carbonate. These anions have weak dissociation constants that range from 19–38 mM. Citrate binding to Eu(S-THP) is predominantly innersphere with a dissociation constant of 17 μM. Luminescence emission peak changes upon addition of anion to Eu(S-THP) show that there are two distinct binding events for phosphate and methylphosphate with dissociation constants of 0.3 mM and 3.0 mM for phosphate and 0.6 mM and 9.8 mM for methyl phosphate. Eu(THPC) contains an appended carbostyril derivative as an antenna to sensitize Eu(III) luminescence. Eu(THPC) binds phosphate and citrate with dissociation constants that are 10-fold less than that of the Eu(S-THP) parent, suggesting that functionalization through a pendent group disrupts the anion binding site. Eu(S-THP) functions as an anion responsive PARACEST agent through exchange of the alcohol protons with bulk water. The alcohol proton resonances of Eu(S-THP) shift downfield in the presence of acetate, lactate, citrate and methylphosphate, giving rise to distinct PARACEST peaks. In contrast, phosphate binds to Eu(S-THP) to suppress the PARACEST alcohol OH peak and carbonate does not markedly change the alcohol peak at 5 mM Eu(S-THP), 15 mM carbonate at pH 6.5 or 7.2. This work shows that the Eu(S-THP) complex has unique selectivity toward binding of biologically relevant anions and that anion binding results in changes in both the luminescence and PARACEST spectra of the complex. PMID:21548563
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Hammell, Jacob; Buttarazzi, Leandro; Huang, Ching-Hui; Morrow, Janet R
2011-06-06
The Eu(III) complex of (1S,4S,7S,10S)-1,4,7,10-tetrakis(2-hydroxypropyl)-1,4,7,10-tetraazacyclododecane (S-THP) is studied as a sensor for biologically relevant anions. Anion interactions produce changes in the luminescence emission spectrum of the Eu(III) complex, in the (1)H NMR spectrum, and correspondingly, in the PARACEST spectrum of the complex (PARACEST = paramagnetic chemical exchange saturation transfer). Direct excitation spectroscopy and luminescence lifetime studies of Eu(S-THP) give information about the speciation and nature of anion interactions including carbonate, acetate, lactate, citrate, phosphate, and methylphosphate at pH 7.2. Data is consistent with the formation of both innersphere and outersphere complexes of Eu(S-THP) with acetate, lactate, and carbonate. These anions have weak dissociation constants that range from 19 to 38 mM. Citrate binding to Eu(S-THP) is predominantly innersphere with a dissociation constant of 17 μM. Luminescence emission peak changes upon addition of anion to Eu(S-THP) show that there are two distinct binding events for phosphate and methylphosphate with dissociation constants of 0.3 mM and 3.0 mM for phosphate and 0.6 mM and 9.8 mM for methyl phosphate. Eu(THPC) contains an appended carbostyril derivative as an antenna to sensitize Eu(III) luminescence. Eu(THPC) binds phosphate and citrate with dissociation constants that are 10-fold less than that of the Eu(S-THP) parent, suggesting that functionalization through a pendent group disrupts the anion binding site. Eu(S-THP) functions as an anion responsive PARACEST agent through exchange of the alcohol protons with bulk water. The alcohol proton resonances of Eu(S-THP) shift downfield in the presence of acetate, lactate, citrate, and methylphosphate, giving rise to distinct PARACEST peaks. In contrast, phosphate binds to Eu(S-THP) to suppress the PARACEST alcohol OH peak and carbonate does not markedly change the alcohol peak at 5 mM Eu(S-THP), 15 mM carbonate at pH 6.5 or 7.2. This work shows that the Eu(S-THP) complex has unique selectivity toward binding of biologically relevant anions and that anion binding results in changes in both the luminescence and the PARACEST spectra of the complex. © 2011 American Chemical Society
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Wang, Yulong; Zhang, Wentao; Zhang, Peicong; Li, Junfeng; Long, Jianping
2015-08-01
Eu(3+)-doped calcium titanate red phosphors, Ca(1-x)Znx TiO3:Eu(3+), were prepared by the sol-gel method. The structure of prepared Ca(1-x)Znx TiO3:Eu(3+) phosphors were investigated by X-ray diffraction and infrared spectra. Due to the (5) D0 → (7) F1-3 electron transitions of Eu(3+) ions, photoluminescence spectra showed a red emission at about 619 nm under excitation of 397 nm and 465 nm, respectively. When zinc was added to the host, the luminescent intensity of Ca(1-x)ZnxTiO3:Eu(3+) was markedly improved several fold compared with that of CaTiO3:Eu(3+). Ca0.9Zn0.1TiO3:Eu(3+) also had higher luminescence intensity than the commercially available Y2 O3:Eu(3+) phosphors under UV light excitation. Copyright © 2014 John Wiley & Sons, Ltd.
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Adsorption of Eu(III) onto TiO2: effect of pH, concentration, ionic strength and soil fulvic acid.
Tan, Xiaoli; Fang, Ming; Li, Jiaxing; Lu, Yi; Wang, Xiangke
2009-08-30
The effects of pH, initial Eu(III) concentration, ionic strength and fulvic acid (FA) on the adsorption of Eu(III) on TiO(2) are investigated by using batch techniques. The results indicate that the presence of FA strongly enhances the adsorption of Eu(III) on TiO(2) at low pH values. Besides, the adsorption of Eu(III) on TiO(2) is significantly dependent on pH values and independent of ionic strength. The adsorption of Eu(III) on TiO(2) is attributed to inner-sphere surface complexation. The diffuse layer model (DLM) is applied to simulate the adsorption data, and fits the experimental data well with the aid of FITEQL 3.2. X-ray photoelectron spectroscopy (XPS) is performed to study the species of Eu(III) adsorbed on the surfaces of TiO(2)/FA-TiO(2) hybrids at a molecular level, which suggest that FA act as "bridge" between Eu(III) and TiO(2) particles to enhance the ability to adsorb Eu(III) in solution.
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Formation of nanostructures in Eu3+ doped glass-ceramics: an XAS study.
Pellicer-Porres, J; Segura, A; Martínez-Criado, G; Rodríguez-Mendoza, U R; Lavín, V
2013-01-16
We describe the results of x-ray absorption experiments carried out to deduce structural and chemical information in Eu(3+) doped, transparent, oxyfluoride glass and nanostructured glass-ceramic samples. The spectra were measured at the Pb and Eu-L(III) edges. The Eu environment in the glass samples is observed to be similar to that of EuF(3). Complementary x-ray diffraction experiments show that thermal annealing creates β-PbF(2) type nanocrystals. X-ray absorption indicates that Eu ions act as seeds in the nanocrystal formation. There is evidence of interstitial fluorine atoms around Eu ions as well as Eu dimers. X-ray absorption at the Pb-L(III) edge shows that after the thermal treatment most lead atoms form a PbO amorphous phase and that only 10% of the lead atoms remain available to form β-PbF(2) type nanocrystals. Both x-ray diffraction and absorption point to a high Eu content in the nanocrystals. Our study suggests new approaches to the oxyfluoride glass-ceramic synthesis in order to further improve their properties.
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Wang, X; Xu, D; Chen, L; Tan, X; Zhou, X; Ren, A; Chen, Ch
2006-04-01
The effects of pH (pH=2-12), ionic strength (0.01-2 mol/l NaNO(3)) and humic acid on the sorption and complexation of Eu(III) on alumina were investigated by using batch techniques. The experiments were carried out at room temperature and under ambient conditions. The results indicate that the sorption of Eu(III) on alumina is strongly influenced by humic acid. The sorption of Eu(III) on alumina is significantly dependent on pH values and independent of ionic strength. The sorption of Eu(III) on alumina may be attributed to surface complexation. The species of Eu(III) on HA-alumina colloids is dominated by both HA and alumina, and the addition sequences of HA or Eu(III) to the ternary system do not influence the sorption of Eu(III) to HA-coated alumina. Kinetic dissociation of Eu(III) from bare and HA-coated alumina was also studied by using the chelating resin. The result was discussed by a pseudo-first-order kinetics model.
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Kephalopoulos, Stylianos; Paviotti, Marco; Anfosso-Lédée, Fabienne; Van Maercke, Dirk; Shilton, Simon; Jones, Nigel
2014-06-01
The Environmental Noise Directive (2002/49/EC) requires EU Member States to determine the exposure to environmental noise through strategic noise mapping and to elaborate action plans in order to reduce noise pollution, where necessary. A common framework for noise assessment methods (CNOSSOS-EU) has been developed by the European Commission in co-operation with the EU Member States to be applied for strategic noise mapping as required by the Environment Noise Directive (2002/49/EC). CNOSSOS-EU represents a harmonised and coherent approach to assess noise levels from the main sources of noise (road traffic, railway traffic, aircraft and industrial) across Europe. This paper outlines the process behind the development of CNOSSOS-EU and the parts of the CNOSSOS-EU core methodological framework which were developed during phase A of the CNOSSOS-EU process (2010-2012), whilst focusing on the main scientific and technical issues that were addressed, and the implementation challenges that are being faced before it can become fully operational in the EU MS. Copyright © 2014. Published by Elsevier B.V.
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Huang, Xiaoyong; Wang, Shaoying; Li, Bin; Sun, Qi; Guo, Heng
2018-03-15
In this work, we reported on high-brightness Eu 3+ -activated Ca 3 Lu(AlO) 3 (BO 3 ) 4 (CLAB) red-emitting phosphors. Under 397 nm excitation, the CLAB:Eu 3+ phosphors showed intense red emissions at around 621 nm with CIE coordinates of (0.657, 0.343). The optimal doping concentration of Eu 3+ ions was found to be 30 mol. %, and the CLAB:0.3Eu 3+ sample possessed high-color purity of 93% and ultra-high internal quantum efficiency as great as 98.5%. Importantly, the CLAB:0.3Eu 3+ also had good thermal stability. Finally, a white-light-emitting diode (WLED) lamp with good color-rendering index was fabricated by using a 365 nm ultraviolet chip and the phosphor blends of CLAB:0.3Eu 3+ red-emitting phosphors, (Ba,Sr) 2 SiO 4 :Eu 2+ green-emitting phosphors, and BaMgAl 10 O 7 :Eu 2+ blue-emitting phosphors.
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NO-assisted molecular-beam epitaxial growth of nitrogen substituted EuO
NASA Astrophysics Data System (ADS)
Wicks, R.; Altendorf, S. G.; Caspers, C.; Kierspel, H.; Sutarto, R.; Tjeng, L. H.; Damascelli, A.
2012-04-01
We have investigated a method for substituting oxygen with nitrogen in EuO thin films, which is based on molecular beam epitaxy distillation with NO gas as the oxidizer. By varying the NO gas pressure, we produce crystalline, epitaxial EuO1 -xNx films with good control over the films' nitrogen concentration. In situ x-ray photoemission spectroscopy reveals that nitrogen substitution is connected to the formation Eu3+4f6 and a corresponding decrease in the number of Eu2+4f7, indicating that nitrogen is being incorporated in its 3- oxidation state. While small amounts of Eu3+ in over-oxidized Eu1-δO thin films lead to a drastic suppression of the ferromagnetism, the formation of Eu3+ in EuO1-xNx still allows the ferromagnetic phase to exist with an unaffected Tc, thus providing an ideal model system to study the interplay between the magnetic f7 (J = 7/2) and the non-magnetic f6 (J = 0) states close to the Fermi level.
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Europium and strontium anomalies in the MORB source mantle
NASA Astrophysics Data System (ADS)
Tang, Ming; McDonough, William F.; Ash, Richard D.
2017-01-01
Lower crustal recycling depletes the continental crust of Eu and Sr and returns Eu and Sr enriched materials into the mantle (e.g., Tang et al., 2015, Geology). To test the hypothesis that the MORB source mantle balances the Eu and Sr deficits in the continental crust, we carried out high precision Eu/Eu∗ and Sr/Sr∗ measurement for 72 MORB glasses with MgO >8.5% from the Pacific, Indian, and Atlantic mid-ocean ridges. MORB glasses with MgO ⩾ 9 wt.% have a mean Eu/Eu∗ of 1.025 ± 0.025 (2 σm, n = 46) and Sr/Sr∗ of 1.242 ± 0.093 (2 σm, n = 41) and these ratios are positively correlated. These samples show both positive and negative Eu and Sr anomalies, with no correlations between Eu/Eu∗ vs. MgO or Sr/Sr∗ vs. MgO, suggesting that the anomalies are not produced by plagioclase fractionation at MgO >9 wt.% and, thus, other processes must be responsible for generating the anomalies. We term these MORB samples primitive MORBs, as they record the melt Eu/Eu∗ and Sr/Sr∗ before plagioclase fractionation. Consequently, the mean oceanic crust, including cumulates, has a bulk Eu/Eu∗ of ∼1 and 20% Sr excess. Considering that divalent Sr and Eu(II) diffuse faster than trivalent Pr, Nd, Sm, and Gd, we evaluated this kinetic effect on Sm-Eu-Gd and Pr-Sr-Nd fractionations during spinel peridotite partial melting in the MORB source mantle. Our modeling shows that the correlated Eu and Sr anomalies seen in primitive MORBs may result from disequilibrium mantle melting. Melt fractions produced during early- and late-stage melting may carry positive and negative Eu and Sr anomalies, respectively, that overlap with the ranges documented in primitive MORBs. Because the net effect of disequilibrium melting is to produce partial melts with bulk positive Eu and Sr anomalies, the MORB source mantle must have Eu/Eu∗ < 1.025 ± 0.025 (2 σm) and Sr/Sr∗ < 1.242 ± 0.093 (2 σm). Although we cannot rule out the possibility that recycled lower continental crustal materials, which have positive Eu and Sr anomalies, are partially mixed into the upper mantle (i.e., MORB source region), a significant amount of this crustal component must have been sequestered into the deep mantle, as supported by the negative 206Pb/204Pb-Eu/Eu∗ and 206Pb/204Pb-Sr/Sr∗ correlations in ocean island basalts.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Li, Kai; Chen, Daqin, E-mail: dqchen@fjirsm.ac.cn; Xu, Ju
2014-01-01
Graphical abstract: We have synthesized Eu{sup 2+} doped and Eu{sup 2+}/Mn{sup 2+} co-doped Ca{sub 3}(PO{sub 4}){sub 2} phosphors. The emitting color varies from blue to green with increasing of Eu{sup 2+} content for the Eu{sup 2+}-doped phosphor, and the quantum yield of the 0.05Eu{sup 2+}: Ca{sub 2.95}(PO{sub 4}){sub 2} sample reaches 56.7%. Interestingly, Mn{sup 2+} co-doping into Eu{sup 2+}: Ca{sub 3}(PO{sub 4}){sub 2} leads to its phase transition from orthorhombic to rhombohedral, and subsequently generates tunable multi-color luminescence from green to red via Eu{sup 2+} → Mn{sup 2+} energy transfer. - Highlights: • A series of novel Eu{sup 2+}: Ca{submore » 3}(PO{sub 4}){sub 2} phosphors were successfully synthesized. • Phase transition of Ca{sub 3}(PO{sub 4}){sub 2} from orthorhombic to rhombohedral occurred when Mn{sup 2+} ions were doped. • The phosphors exhibited tunable multi-color luminescence. • The quantum yield of 0.05Eu{sup 2+}: Ca{sub 2.95}(PO{sub 4}){sub 2} phosphor can reach 56.7%. • The analyses of phosphors were carried out by many measurements. - Abstract: Intense blue-green-emitting Eu{sup 2+}: Ca{sub 3}(PO{sub 4}){sub 2} and tunable multicolor-emitting Eu{sup 2+}/Mn{sup 2+}: Ca{sub 3}(PO{sub 4}){sub 2} phosphors are prepared via a solid-state reaction route. Eu{sup 2+}-doped orthorhombic Ca{sub 3}(PO{sub 4}){sub 2} phosphor exhibits a broad emission band in the wavelength range of 400–700 nm with a maximum quantum yield of 56.7%, and the emission peak red-shifts gradually from 479 to 520 nm with increase of Eu{sup 2+} doping content. Broad excitation spectrum (250–420 nm) of Eu{sup 2+}: Ca{sub 3}(PO{sub 4}){sub 2} matches well with the near-ultraviolet LED chip, indicating its potential applications as tri-color phosphors in white LEDs. Interestingly, Mn{sup 2+} co-doping into Eu{sup 2+}: Ca{sub 3}(PO{sub 4}){sub 2} leads to its phase transition from orthorhombic to rhombohedral, and subsequently generates tunable multi-color luminescence from green to red via Eu{sup 2+} → Mn{sup 2+} energy transfer, under 365 nm UV lamp excitation.« less
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User acceptance of mobile commerce: an empirical study in Macau
NASA Astrophysics Data System (ADS)
Lai, Ivan K. W.; Lai, Donny C. F.
2014-06-01
This study aims to examine the positive and negative factors that can significantly explain user acceptance of mobile commerce (m-commerce) in Macau. A technology acceptance model for m-commerce with five factors is constructed. The proposed model is tested using data collected from 219 respondents. Confirmatory factor analysis is performed to examine the reliability and validity of the model, and structural equation modelling is performed to access the relationship between behaviour intention and each factor. The acceptance of m-commerce is influenced by factors including performance expectancy, social influence, facilitating conditions and privacy concern; while effort expectancy is insignificant in this case. The results of the study are useful for m-commerce service providers to adjust their strategies for promoting m-commerce services. This study contributes to the practice by providing a user technology acceptance model for m-commerce that can be used as a foundation for future research.
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Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Amount of activities which constitute engaging in commerce or in the production of goods for commerce. 779.109 Section 779.109 Labor Regulations Relating to... Engaged in Commerce Or in the Production of Goods for Commerce § 779.109 Amount of activities which...
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Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Amount of activities which constitute engaging in commerce or in the production of goods for commerce. 779.109 Section 779.109 Labor Regulations Relating to... Engaged in Commerce Or in the Production of Goods for Commerce § 779.109 Amount of activities which...
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Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Amount of activities which constitute engaging in commerce or in the production of goods for commerce. 779.109 Section 779.109 Labor Regulations Relating to... Engaged in Commerce Or in the Production of Goods for Commerce § 779.109 Amount of activities which...
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Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Amount of activities which constitute engaging in commerce or in the production of goods for commerce. 779.109 Section 779.109 Labor Regulations Relating to... Engaged in Commerce Or in the Production of Goods for Commerce § 779.109 Amount of activities which...
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Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Amount of activities which constitute engaging in commerce or in the production of goods for commerce. 779.109 Section 779.109 Labor Regulations Relating to... Engaged in Commerce Or in the Production of Goods for Commerce § 779.109 Amount of activities which...
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Electronic Commerce: A National Performance Review Initiative.
1995-09-01
This study of the National Information Infrastructure (NII) was conducted as part of IDA’s Central Research Program. Electronic commerce is one of... commerce is nothing more than conducting business via electronic means. An outgrowth of the NPR, the electronic commerce initiative, commits the...private, and public sectors are committed to implementing electronic commerce throughout the United States. The objective ol this paper is to enhance
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Multiple magnetic transitions in EuNiSi3
NASA Astrophysics Data System (ADS)
Patil, Sujata M.; Paulose, P. L.
2018-04-01
EuNiSi3 undergoes multiple magnetic transitions below 50K. We have studied this system using low field ac susceptibility and 151Eu Mössbauer spectroscopy to understand the nature of multiple magnetic transitions. The estimated hyperfine field (hf) at Eu site at 5K is 45 Tesla which is unusually large compared to the normal observed hf of 33T in most of the Eu intermetallics.
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NASA Astrophysics Data System (ADS)
Van, Hoang Nhu; Hoan, Bui Thi; Nguyen, Khoi Thi; Tam, Phuong Dinh; Huy, Pham Thanh; Pham, Vuong-Hung
2018-03-01
Tunable light emission from europium (Eu2+)/manganese (Mn2+)-codoped beta-tricalcium phosphate [β-Ca3(PO4)2 (TCP)] has been investigated as a function of the Mn2+ and Eu2+ concentrations and annealing temperature. Eu2+/Mn2+-doped TCP phosphor (Eu/Mn-TCP) was synthesized by coprecipitation method followed by thermal annealing at temperature up to 1100°C. The Eu2+/Mn2+-doped TCP particles have diameter of about 1 μm. The light emission from TCP is enhanced in the sample with 7.5 mol.% Mn2+ and 0.3 mol.% Eu2+ annealed in Ar + 5% H2 atmosphere at 1100°C. The blue band at 430 nm is attributed to the 4f 6 5d 1-4f 7 transition of Eu2+. The sharp peak at 660 nm is ascribed to the 4T1-6A1 transition of Mn2+ in TCP. These results suggest codoping of Eu2+/Mn2+ to TCP phosphor to obtain β-Ca3(PO4)2:Eu2+,Mn2+ phosphors with tunable luminescence, having potential applications in agricultural lighting.
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Luminomagnetic Eu3+- and Dy3+-doped hydroxyapatite for multimodal imaging.
Tesch, Annemarie; Wenisch, Christoph; Herrmann, Karl-Heinz; Reichenbach, Jürgen R; Warncke, Paul; Fischer, Dagmar; Müller, Frank A
2017-12-01
Multimodal imaging has recently attracted much attention due to the advantageous combination of different imaging modalities, like photoluminescence (PL) and magnetic resonance imaging (MRI). In the present study, luminescent and magnetic hydroxyapatites (HAp) were prepared via doping with europium (Eu 3+ ) and dysprosium (Dy 3+ ), respectively. Co-doping of Eu 3+ and Dy 3+ was used to combine the desired physical properties. Both lanthanide ions were successfully incorporated in the HAp crystal lattice, where they preferentially occupied calcium(I) sites. While Eu-doped HAp (Eu:HAp) exhibits dopant concentration dependent persistent PL properties, Dy-doped HAp (Dy:HAp) shows paramagnetic behavior due to the high magnetic moment of Dy 3+ . Co-doped HAp (Eu:Dy:HAp) nanoparticles combine both properties in one single crystal. Remarkably, multimodal co-doped HAp features enhanced PL properties due to an energy transfer from Dy 3+ sensitizer to Eu 3+ activator ions. Eu:Dy:HAp exhibits strong transverse relaxation effects with a maximum transverse relaxivity of 83.3L/(mmol·s). Due to their tunable PL, magnetic properties and cytocompatibility Eu:-, Dy:- and Eu:Dy:HAp represent promising biocompatible ceramic materials for luminescence imaging that simultaneously may serve as a contrast agent for MRI in permanent implants or functional coatings. Copyright © 2017 Elsevier B.V. All rights reserved.
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Transport of europium colloids in vadose zone lysimeters at the semiarid Hanford site.
Liu, Ziru; Flury, Markus; Zhang, Z Fred; Harsh, James B; Gee, Glendon W; Strickland, Chris E; Clayton, Ray E
2013-03-05
The objective of this study was to quantify transport of Eu colloids in the vadose zone at the semiarid Hanford site. Eu-hydroxy-carbonate colloids, Eu(OH)(CO3), were applied to the surface of field lysimeters, and migration of the colloids through the sediments was monitored using wick samplers. The lysimeters were exposed to natural precipitation (145-231 mm/year) or artificial irrigation (124-348 mm/year). Wick outflow was analyzed for Eu concentrations, supplemented by electron microscopy and energy-dispersive X-ray analysis. Small amounts of Eu colloids (<1%) were detected in the deepest wick sampler (2.14 m depth) 2.5 months after application and cumulative precipitation of only 20 mm. We observed rapid transport of Eu colloids under both natural precipitation and artificial irrigation; that is, the leading edge of the Eu colloids moved at a velocity of 3 cm/day within the first 2 months after application. Episodic infiltration (e.g., Chinook snowmelt events) caused peaks of Eu in the wick outflow. While a fraction of Eu moved consistent with long-term recharge estimates at the site, the main mass of Eu remained in the top 30 cm of the sediments. This study illustrates that, under field conditions, near-surface colloid mobilization and transport occurred in Hanford sediments.
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Energy transfer and color tunable emission in Tb3 +,Eu3 + co-doped Sr3LaNa(PO4)3F phosphors
NASA Astrophysics Data System (ADS)
Li, Shuo; Guo, Ning; Liang, Qimeng; Ding, Yu; Zhou, Huitao; Ouyang, Ruizhuo; Lü, Wei
2018-02-01
A group of color tunable Sr3LaNa(PO4)3F:Tb3 +,Eu3 + phosphors were prepared by conventional high temperature solid state method. The phase structures, luminescence properties, fluorescence lifetimes and energy transfer were investigated in detail. Under 369 nm excitation, owing to efficient energy transfer of Tb3 + → Eu3 +, the emission spectra both have green emission of Tb3 + and red emission of Eu3 +. An efficient energy transfer occur in Tb3 +, Eu3 + co-doped Sr3LaNa(PO4)3F phosphors. The most possible mechanism of energy transfer is dipole-dipole interaction by Dexter's theoretical model. The energy transfer of Tb3 + and Eu3 + was confirmed by the variations of emission and excitation spectra and Tb3 +/Eu3 + decay lifetimes in Sr3LaNa(PO4)3F:Tb3 +,Eu3 +. The color tone can tuned from yellowish-green through yellow and eventually to reddish-orange with fixed Tb3 + content by changing Eu3 + concentrations. The results show that the prepared Tb3 +, Eu3 + co-doped color tunable Sr3LaNa(PO4)3F phosphor can be used for white LED.
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Large negative magnetoresistance of a nearly Dirac material: Layered antimonide EuMnS b2
NASA Astrophysics Data System (ADS)
Yi, Changjiang; Yang, Shuai; Yang, Meng; Wang, Le; Matsushita, Yoshitaka; Miao, Shanshan; Jiao, Yuanyuan; Cheng, Jinguang; Li, Yongqing; Yamaura, Kazunari; Shi, Youguo; Luo, Jianlin
2017-11-01
Single crystals of EuMnS b2 were successfully grown and their structural and electronic properties were investigated systematically. The material crystallizes in an orthorhombic-layered structure (space group: Pnma, No. 62) comprising a periodic sequence of -MnSb/Eu/Sb/Eu/- layers (˜1 nm in thickness), and massless fermions are expected to emerge in the Sb layer, by analogy of the candidate Dirac materials EuMnB i2 and A Mn P n2 (A =Ca or Sr or Ba, P n =Sb or Bi). The magnetic and specific heat measurements of EuMnS b2 suggest an antiferromagnetic ordering of Eu moments near 20 K. A characteristic hump appears in the temperature-dependent electrical resistivity curve at ˜25 K . A spin-flop transition of Eu moments with an onset magnetic field of ˜15 kOe (at 2 K) was observed. Interestingly, EuMnS b2 shows a negative magnetoresistance (up to -95 % ) in contrast to the positive magnetoresistances observed for EuMnB i2 and A Mn P n2 (A =Ca or Sr or Ba, P n =Sb or Bi), providing a unique opportunity to study the correlation between electronic and magnetic properties in this class of materials.
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Thermal decomposition of europium sulfates Eu2(SO4)3·8H2O and EuSO4
NASA Astrophysics Data System (ADS)
Denisenko, Yu. G.; Khritokhin, N. A.; Andreev, O. V.; Basova, S. A.; Sal'nikova, E. I.; Polkovnikov, A. A.
2017-11-01
Reactions of europium sulfates Eu2(SO4)3·8H2O and EuSO4 complete decomposition were studied by Simultaneous Thermal Analysis. It was revealed that one-step dehydratation of Eu2(SO4)3·8H2O crystallohydrate is accompanied by the formation of amorphous anhydrous europium sulfate Eu2(SO4)3. Crystallization of amorphous europium (III) sulfate occurs at 381.1 °C (in argon) and 391.3 °C (in air). The average enthalpy values for dehydratation reaction of Eu2(SO4)3·8H2O (ΔH° = 141.1 kJ/mol), decomposition reactions of Eu2(SO4)3 (ΔH = 463.1 kJ/mol), Eu2O2SO4 (ΔH = 378.4 kJ/mol) and EuSO4 (ΔH = 124.1 kJ/mol) were determined. The step process mechanisms of thermal decomposition of europium (III) sulfate in air and europium (II) sulfate in inert atmosphere were established and justified. The kinetic parameters of complete thermal decomposition of europium (III) sulfate octahydrate were calculated by Kissinger model. The standard enthalpies of compound formation were calculated using thermal effects and formation enthalpy data for binary compounds.
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View looking from the top of the Commerce Department building ...
View looking from the top of the Commerce Department building to the Interstate Commerce Commission (right) and Ariel Rios Federal Building (left) - Interstate Commerce Commission, Constitution Avenue between Twelfth and Fourteenth streets, Washington, District of Columbia, DC
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Electronic commerce: beyond the euphoria.
Healy, J L; DeLuca, J M
2000-01-01
As the center of considerable media attention, case study articles, vendor research, and development efforts, electronic commerce technology is entering healthcare and having a profound effect. The simple truth, however, is that after the drama and excitement begins to wear off, completing a successful e-commerce implementation remains good old-fashioned hard, sometimes monotonous work. To be successful, e-commerce technologies must be planned and implemented with rigorous project standards, and incorporated with significant process and workflow reengineering to actually return significant value to the organization. This article briefs readers on the organizational issues they must consider in evaluating e-commerce readiness--cultural, executive and technological factors that either support or inhibit project and technology success. Readers will be left with the tools to conduct an electronic commerce "readiness assessment" to evaluate the immediate, mid- and long-term potential of electronic commerce; practical remediation strategies for better preparing the organization for the changes inherent in moving to an e-commerce-enabled business model; and comments from the field--advice from organizations that have successfully implemented e-commerce technologies into their ongoing operations.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Cho, Young-Sik; Huh, Young-Duk, E-mail: ydhuh@dankook.ac.kr
Highlights: • Red-emitting BaWO{sub 4}:Eu phosphors were prepared in hexane-water bilayer system. • The hydrophobic nanometer-sized BaWO{sub 4}:Eu phosphors were obtained in hexane. • The hydrophilic micrometer-sized BaWO{sub 4}:Eu dendrites were obtained in water. - Abstract: BaWO{sub 4}:Eu phosphors were prepared by performing a solvothermal reaction in a water–hexane bilayer system. A barium oleate (and europium oleate) complex was obtained in hexane via a phase transfer reaction involving Ba{sup 2+} (and Eu{sup 3+}) ions in an aqueous solution of sodium oleate. The outer surfaces of the nanometer-sized BaWO{sub 4}:Eu phosphors were capped by the long alkyl chain of oleate; therefore,more » the hydrophobic nanometer-sized BaWO{sub 4}:Eu phosphors preferentially dissolved in the hexane layer. The micrometer-sized BaWO{sub 4}:Eu phosphors were obtained in the water layer. The BaWO{sub 4}:Eu phosphors prepared in hexane and water yielded sharp strong absorption and emission peaks at 464 and 615 nm, respectively, due to the {sup 7}F{sub 0} → {sup 5}D{sub 2} and the {sup 5}D{sub 0} →{sup 7} F{sub 2} transitions of the Eu{sup 3+} ions. The BaWO{sub 4}:Eu phosphors are good candidate red-emitting phosphors for use in InGaN blue-emitting diodes, which have an emission wavelength of 465 nm.« less
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NASA Astrophysics Data System (ADS)
Zhang, Yu; Wang, Xinzhi; Tang, Jianguo; Wang, Wei; Wang, Jinping; Belfiore, Laurence A.
2017-04-01
In this contribution, we obtained the strong enhancement effect of silver nanowires(AgNWs) on fluorescent property of Eu3+-antenna complexes through the function of the surface plasmon resonance(SPR) effect. The key structural characteristics are: (1) AgNWs are covered by the Eu3+-ligand complex and spaced by SiO2 nano-layer between AgNWs and Eu3+-ligand complex (this structure is marked as AgNWs@SiO2@EuTP), and (2) AgNWs as nano-material with large ratio of length to diameter show their good dispersion and processability in isotactic polypropylene (iPP). We obtained the important data about the optimal spacer thickness of SiO2 is 15 nm that was not found in previous publications. The enhanced intensity of fluorescence of EuTP by AgNWs in AgNWs@SiO2@EuTP is 9 times compared with that of EuTP. All of these outstanding properties and fine structures were characterized by TEM, FT-IR, XRD, and fluorescence spectrophotometer. On the other hand, the desired fluorescent iPP composite material was obtained through blending AgNWs@SiO2@EuTP into iPP host. Very importantly, the enhancement effect of AgNWs on EuTP fluorescence in AgNWs@SiO2@EuTP is refrained from the quenching caused by host polymer of iPP.
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Effect of Eu-doping on optical, structural and morphological properties of BaI2·nH2O powders
NASA Astrophysics Data System (ADS)
Salamakha, T.; Buryi, M.; Tratsiak, Y.
2018-04-01
The two-step approach to the Eu2+ doped BaI2·nH2O powders synthesis in Ar atmosphere from precursors containing different concentration of Eu3+ ions is reported. According to X-ray diffraction analysis the powders mainly consist of BaI2·2H2O phase. Their morphological, structural and luminescent properties depend on the Eu-ions concentration. The luminescence spectra are composed of broad and strong emission band peaking at 420 nm, which was related to the Eu2+ 5d-4f transition. Its intensity reaches maximum in the 2 at. % Eu2+ doped sample. Detailed analysis of the measured electron paramagnetic resonance spectra in the samples with different doping level confirms them belong to the Eu2+ ions substituting for the regular Ba2+ site in the BaI2 lattice. A sample exposed to the 330 nm UV irradiation exhibited an increase of the Eu2+ spectral intensity occurred exclusively due to the Eu3+ to Eu2+ transformation. No other signals either prior to or after the irradiation which might be attributed to the ions resided in e.g., interstitial positions or in any secondary phases were observed. Possible mechanisms of the Eu3+ stabilization in the host lattice with only divalent cation sites during the synthesis without additional treatment in reducing atmosphere are discussed as well.
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NASA Astrophysics Data System (ADS)
Sobolev, B. P.; Turkina, T. M.; Sorokin, N. I.; Karimov, D. N.; Komar'kova, O. N.; Sulyanova, E. A.
2010-07-01
The nonstoichiometric phase EuF2+ x has been obtained via the partial reduction of EuF3 by elementary Si at 900-1100°C. Eu{0.916/2+}Eu{0.084/3+}F2.084 (EuF2.084) single crystals have been grown from melt by the Bridgman method in a fluorinating atmosphere. These crystals belong to the CaF2 structure type (sp. gr. Fm bar 3 m) with the cubic lattice parameter a = 5.8287(2) Å, are transparent in the spectral range of 0.5-11.3 μm, and have microhardness H μ = 3.12 ± 0.13 GPa and ionic conductivity σ = 1.4 × 10-5 S/cm at 400°C with the ion transport activation energy E a = 1.10 ± 0.05 eV. The physicochemical characteristics of the fluorite phases in the EuF2 - EuF3 systems are similar to those of the phases in the SrF2 - EuF3 and SrF2 - GdF3 systems due to the similar lattice parameters of the EuF2 and SrF2 components. Europium difluoride supplements the list of fluorite components MF2 ( M = Ca, Sr, Ba, Cd, Pb), which are crystal matrices for nonstoichiometric (nanostructured) fluoride materials M 1 - x R x F2 + x ( R are rare earth elements).
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Eu oxidation state in fluorozirconate-based glass ceramics
DOE Office of Scientific and Technical Information (OSTI.GOV)
Henke, B.; Passlick, C.; Keil, P.
2009-12-01
The influence of InF{sub 3} doping and remelting on Eu-doped fluorozirconate-based glass ceramics was investigated using near-edge x-ray absorption and optical spectroscopy. It was found that the addition of InF{sub 3} to the melt decreases the Eu{sup 2+}/Eu{sup 3+} mole ratio, while remelting leads to a significant change in the Eu{sup 2+}/Eu{sup 3+} ratio in favor of Eu{sup 2+}. Photoluminescence spectroscopy shows that additional annealing steps lead to the formation of BaCl{sub 2} nanoparticles in the glass. In as-made glass ceramics containing InF{sub 3}, a phase transition of the nanoparticles from hexagonal to orthorhombic structure is observed. This phase transitionmore » is not observed in the remelted glasses studied here.« less
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Synthesis, energy transfer and tunable emission properties of SrSb2O6:Eu3 +, Bi3 + phosphor
NASA Astrophysics Data System (ADS)
Cao, Renping; Fu, Ting; Peng, Dedong; Cao, Chunyan; Ruan, Wen; Yu, Xiaoguang
2016-12-01
Host SrSb2O6, SrSb2O6:Bi3 +, SrSb2O6:Eu3 +, and SrSb2O6:Eu3 +, Bi3 + phosphors are synthesized by solid state reaction method in air. Host SrSb2O6 with excitation 254 nm shows weak green-yellow emission in the range of 320-780 nm due to Sb5 + → O2- transition. SrSb2O6:Bi3 + phosphor with excitation 365 nm emits green light within the range 400-650 nm owing to the 3P1 → 1S0 transition of Bi3 + ion. SrSb2O6:Eu3 + phosphor with excitation 254 nm exhibits a systematically varied hue from green to orange-red light by increasing Eu3 + concentration from 0 to 7 mol%, and that with excitation 394 nm only shows orange-red light. The optimal Eu3 + concentration is 4 mol% in SrSb2O6:Eu3 + phosphor. SrSb2O6:Eu3 +, Bi3 + phosphor with excitation 254 and 394 nm emits orange-red light. Emission intensity of SrSb2O6:Eu3 + phosphor may be enhanced > 2 times by co-doping Bi3 + ion because of the fluxing agent and energy transfer roles of Bi3 + ion in SrSb2O6:Eu3 +, Bi3 + phosphor. The luminous mechanism of SrSb2O6:Eu3 +, Bi3 + phosphor is analyzed and explained by the simplified energy level diagrams of Sb2O62 - group, Bi3 + and Eu3 + ions, and energy transfer processes between them.
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Synthesis and luminescent properties of CaCO3:Eu3+@SiO2 phosphors with core-shell structure
NASA Astrophysics Data System (ADS)
Liu, Min; Kang, Ming; Chen, Kexu; Mou, Yongren; Sun, Rong
2018-03-01
Integrating the processes of preparation of CaCO3:Eu3+ and its surface-coating, core-shell structured CaCO3:Eu3+@SiO2 phosphors with red emission were synthesized by the carbonation method and surface precipitation procedure using sodium silicate as silica source. The phase structure, thermal stability, morphology and luminescent property of the as-synthesized samples were characterized by X-ray diffraction, Fourier transform infrared spectrum, thermal analysis, field-emission scanning electron microscopy, transmission electron microscope and photoluminescence spectra. The experimental results show that Eu3+ ions as the luminescence center are divided into two types: one is at the surface of the CaCO3 and the other inhabits the site of Ca2+. For CaCO3:Eu3+@SiO2 phosphors, the SiO2 layers are continuously coated on the surface of CaCO3:Eu3+ and show a typical core-shell structure. After coated with SiO2 layer, the luminous intensity and the compatibility with the rubber matrix increase greatly. Additionally, the luminous intensity increases with the increasing of Eu3+ ions concentration in CaCO3 core and concentration quenching occurs when Eu3+ ions concentration exceeds 7.0 mol%, while it is 5.0 mol% for CaCO3:Eu3+ phosphors. Therefore, preparation of CaCO3:Eu3+@SiO2 phosphors can not only simplify the experimental process through integrating the preparation of CaCO3:Eu3+ and SiO2 layer, but also effectively increase the luminous intensities of CaCO3:Eu3+ phosphors. The as-obtained phosphors may have potential applications in the fields of optical materials and functional polymer composite materials, such as plastics and rubbers.
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The synthesis and luminescence properties of a novel red-emitting phosphor: Eu3+-doped Ca9La(PO4)7
NASA Astrophysics Data System (ADS)
Liang, Zehui; Mu, Zhongfei; Wang, Qiang; Zhu, Daoyun; Wu, Fugen
2017-10-01
A series of novel red-emitting phosphors Ca9La1- x (PO4)7: xEu3+ were synthesized by high-temperature solid state reactions. The photoluminescence excitation and photoluminescence spectra of these phosphors were investigated in detail. O2--Eu3+ charge transfer band peaking at about 261 nm is dominant in the PLE spectra of Eu3+-doped Ca9La(PO4)7, indicating that the phosphors are suitable for tricolor fluorescent lamps. The phosphors also show a good absorption in near ultraviolet (around 395 nm) and blue (around 465 nm) spectral region, which indicates that it can be pumped with NUV and blue chips for white light-emitting diodes. The transition of 5D0 → 7F2 of Eu3+ in this lattice can emit bright red light. Ca9La(PO4)7 could accommodate a large amount of Eu3+ with an optimal concentration of 60 mol%. The dipole-dipole interaction between Eu3+ is the dominant mechanism for concentration quenching of Eu3+. The calculated color coordinates lie in red region ( x = 0.64, y = 0.36), which is close to Y2O3: 0.05Eu3+ ( x = 0.65, y = 0.34). The integral emission intensity of Ca9La0.4(PO4)7: 0.6Eu3+ is 1.9 times stronger than that of widely used commercial red phosphor Y2O3: 0.05Eu3+. All these results indicate that Eu3+-doped Ca9La(PO4)7 is a promising red-emitting phosphor which can be used in tricolor fluorescent lamps and white light-emitting diodes.
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Cao, Shiwei; Jiao, Yang; Han, Weifang; Ge, Chunhua; Song, Bo; Wang, Jie; Zhang, Xiangdong
2018-02-05
4ZnO·B 2 O 3 ·H 2 O:Ln 3+ (Ln=Eu, Tb) phosphors with different morphologies have been successfully synthesized via one-step hydrothermal method through regulating the molar amount of Eu 3+ and Tb 3+ . Comprehensive scanning electron microscopy (SEM), X-ray diffraction (XRD) Fourier transform infrared spectrum (FT-IR) and inductively coupled plasma atomic emission spectrometer (ICP-AES) characterizations all confirm that obtained products are 4ZnO·B 2 O 3 ·H 2 O:Ln 3+ (Ln=Eu, Tb). The experimental results displayed that the morphology and photoluminescence of compounds is regularly changed with increased the molar amount of rare earth ions. For the Eu 3+ -doped, Tb 3+ -doped and Eu 3+ /Tb 3+ co-doped 4ZnO·B 2 O 3 ·H 2 O phosphors of morphologies, the rod-like structures gradually changed to flower-like structures, fine wire-like structure and hybrid structure, respectively. To their photoluminescence, the Eu 3+ shows a red emission (615nm); the Tb 3+ shows a green emission (545nm); for the Eu 3+ /Tb 3+ co-doped 4ZnO·B 2 O 3 ·H 2 O phosphors, a combination of blue (5d-4f of Eu 2+ ), green ( 5 D 4 - 7 F 5 of Tb 3+ ) and red ( 5 D 0 - 7 F 2 of Eu 3+ ) emissions emerges to achieve white emission. In addition, the energy transfer among Eu 3+ , Eu 2+ and Tb 3+ ions was also discussed. Copyright © 2017. Published by Elsevier B.V.
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15 CFR 325.14 - Submitting reports.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false Submitting reports. 325.14 Section 325.14 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) INTERNATIONAL TRADE ADMINISTRATION, DEPARTMENT OF COMMERCE MISCELLANEOUS REGULATIONS EXPORT TRADE CERTIFICATES...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false Definitions. 335.2 Section 335.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) INTERNATIONAL TRADE ADMINISTRATION, DEPARTMENT OF COMMERCE MISCELLANEOUS REGULATIONS IMPORTS OF WORSTED WOOL FABRIC...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false Purpose. 303.15 Section 303.15 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) INTERNATIONAL TRADE ADMINISTRATION, DEPARTMENT OF COMMERCE MISCELLANEOUS REGULATIONS WATCHES, WATCH MOVEMENTS AND...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Purpose. 1160.20 Section 1160.20 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic Partnership Initiative...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Appearances. 904.5 Section 904.5 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE GENERAL REGULATIONS CIVIL PROCEDURES General...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Appearances. 904.5 Section 904.5 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE GENERAL REGULATIONS CIVIL PROCEDURES General...
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15 CFR 1160.4 - Antitrust considerations.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Antitrust considerations. 1160.4 Section 1160.4 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Purpose. 1160.1 Section 1160.1 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of Private Sector...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Definitions. 1160.21 Section 1160.21 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic Partnership Initiative...
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15 CFR 1160.6 - Proprietary data.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Proprietary data. 1160.6 Section 1160.6 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of...
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15 CFR 1160.6 - Proprietary data.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Proprietary data. 1160.6 Section 1160.6 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of...
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15 CFR 1160.4 - Antitrust considerations.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Antitrust considerations. 1160.4 Section 1160.4 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Purpose. 1160.1 Section 1160.1 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of Private Sector...
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Code of Federal Regulations, 2013 CFR
2013-01-01
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Definitions. 1160.2 Section 1160.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of Private Sector...
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15 CFR 1160.4 - Antitrust considerations.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Antitrust considerations. 1160.4 Section 1160.4 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of...
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Code of Federal Regulations, 2010 CFR
2010-01-01
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15 CFR 1160.26 - Proprietary data.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Proprietary data. 1160.26 Section 1160.26 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic...
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15 CFR 1160.26 - Proprietary data.
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 3 2013-01-01 2013-01-01 false Proprietary data. 1160.26 Section 1160.26 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic...
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15 CFR 1160.6 - Proprietary data.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Proprietary data. 1160.6 Section 1160.6 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 3 2013-01-01 2013-01-01 false Purpose. 1160.20 Section 1160.20 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic Partnership Initiative...
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15 CFR 1160.24 - Antitrust considerations.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Antitrust considerations. 1160.24 Section 1160.24 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic...
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15 CFR 1160.26 - Proprietary data.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Proprietary data. 1160.26 Section 1160.26 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Purpose. 1160.20 Section 1160.20 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic Partnership Initiative...
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15 CFR 1160.24 - Antitrust considerations.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Antitrust considerations. 1160.24 Section 1160.24 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic...
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15 CFR 1160.26 - Proprietary data.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Proprietary data. 1160.26 Section 1160.26 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Definitions. 1160.21 Section 1160.21 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic Partnership Initiative...
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15 CFR 1160.24 - Antitrust considerations.
Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 3 2013-01-01 2013-01-01 false Antitrust considerations. 1160.24 Section 1160.24 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 3 2012-01-01 2012-01-01 false Definitions. 1160.2 Section 1160.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Promotion of Private Sector...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 3 2011-01-01 2011-01-01 false Purpose. 1160.20 Section 1160.20 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) TECHNOLOGY ADMINISTRATION, DEPARTMENT OF COMMERCE PRODUCTIVITY, TECHNOLOGY AND INNOVATION Strategic Partnership Initiative...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false Definitions. 325.2 Section 325.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) INTERNATIONAL TRADE ADMINISTRATION, DEPARTMENT OF COMMERCE MISCELLANEOUS REGULATIONS EXPORT TRADE CERTIFICATES OF...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... facilitates electronic commerce (E-commerce) and allows Farm Credit System (System) institutions and their customers to use new technologies. System institutions may use E-commerce but must establish good business... Banking FARM CREDIT ADMINISTRATION FARM CREDIT SYSTEM ELECTRONIC COMMERCE General Rules § 609.905...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... facilitates electronic commerce (E-commerce) and allows Farm Credit System (System) institutions and their customers to use new technologies. System institutions may use E-commerce but must establish good business... Banking FARM CREDIT ADMINISTRATION FARM CREDIT SYSTEM ELECTRONIC COMMERCE General Rules § 609.905...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... facilitates electronic commerce (E-commerce) and allows Farm Credit System (System) institutions and their customers to use new technologies. System institutions may use E-commerce but must establish good business... Banking FARM CREDIT ADMINISTRATION FARM CREDIT SYSTEM ELECTRONIC COMMERCE General Rules § 609.905...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... facilitates electronic commerce (E-commerce) and allows Farm Credit System (System) institutions and their customers to use new technologies. System institutions may use E-commerce but must establish good business... Banking FARM CREDIT ADMINISTRATION FARM CREDIT SYSTEM ELECTRONIC COMMERCE General Rules § 609.905...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... facilitates electronic commerce (E-commerce) and allows Farm Credit System (System) institutions and their customers to use new technologies. System institutions may use E-commerce but must establish good business... Banking FARM CREDIT ADMINISTRATION FARM CREDIT SYSTEM ELECTRONIC COMMERCE General Rules § 609.905...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... Assistant Secretary for Export Development, International Trade Administration, Department of Commerce. (e... 15 Commerce and Foreign Trade 2 2010-01-01 2010-01-01 false Definitions. 310.2 Section 310.2 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) INTERNATIONAL...
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29 CFR 779.243 - Goods that have been “produced for commerce by any person.”
Code of Federal Regulations, 2011 CFR
2011-07-01
... 29 Labor 3 2011-07-01 2011-07-01 false Goods that have been âproduced for commerce by any person.â... Moved in Or Produced for Commerce by Any Person § 779.243 Goods that have been “produced for commerce by... that have been “produced for commerce by any person” within the meaning of section 3(s), if he is...
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29 CFR 779.243 - Goods that have been “produced for commerce by any person.”
Code of Federal Regulations, 2012 CFR
2012-07-01
... 29 Labor 3 2012-07-01 2012-07-01 false Goods that have been âproduced for commerce by any person.â... Moved in Or Produced for Commerce by Any Person § 779.243 Goods that have been “produced for commerce by... that have been “produced for commerce by any person” within the meaning of section 3(s), if he is...
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29 CFR 779.243 - Goods that have been “produced for commerce by any person.”
Code of Federal Regulations, 2013 CFR
2013-07-01
... 29 Labor 3 2013-07-01 2013-07-01 false Goods that have been âproduced for commerce by any person.â... Moved in Or Produced for Commerce by Any Person § 779.243 Goods that have been “produced for commerce by... that have been “produced for commerce by any person” within the meaning of section 3(s), if he is...
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29 CFR 779.243 - Goods that have been “produced for commerce by any person.”
Code of Federal Regulations, 2014 CFR
2014-07-01
... 29 Labor 3 2014-07-01 2014-07-01 false Goods that have been âproduced for commerce by any person.â... Moved in Or Produced for Commerce by Any Person § 779.243 Goods that have been “produced for commerce by... that have been “produced for commerce by any person” within the meaning of section 3(s), if he is...
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29 CFR 779.243 - Goods that have been “produced for commerce by any person.”
Code of Federal Regulations, 2010 CFR
2010-07-01
... 29 Labor 3 2010-07-01 2010-07-01 false Goods that have been âproduced for commerce by any person.â... Moved in Or Produced for Commerce by Any Person § 779.243 Goods that have been “produced for commerce by... that have been “produced for commerce by any person” within the meaning of section 3(s), if he is...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... action will be taken to collect a debt from a payment issued by a Commerce entity. (e) Review. A Commerce... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How do other Federal agencies use the offset process to collect debts from payments issued by a Commerce entity? 19.20 Section 19.20 Commerce...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... action will be taken to collect a debt from a payment issued by a Commerce entity. (e) Review. A Commerce... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How do other Federal agencies use the offset process to collect debts from payments issued by a Commerce entity? 19.20 Section 19.20 Commerce...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How does a debtor request a special....18 Section 19.18 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.18 How does a debtor request a special review based on a...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... action will be taken to collect a debt from a payment issued by a Commerce entity. (e) Review. A Commerce... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How do other Federal agencies use the offset process to collect debts from payments issued by a Commerce entity? 19.20 Section 19.20 Commerce...
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Code of Federal Regulations, 2014 CFR
2014-01-01
... action will be taken to collect a debt from a payment issued by a Commerce entity. (e) Review. A Commerce... 15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01 false How do other Federal agencies use the offset process to collect debts from payments issued by a Commerce entity? 19.20 Section 19.20 Commerce...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... action will be taken to collect a debt from a payment issued by a Commerce entity. (e) Review. A Commerce... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false How do other Federal agencies use the offset process to collect debts from payments issued by a Commerce entity? 19.20 Section 19.20 Commerce...
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Code of Federal Regulations, 2013 CFR
2013-01-01
... 15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01 false How does a debtor request a special....18 Section 19.18 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.18 How does a debtor request a special review based on a...
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Code of Federal Regulations, 2011 CFR
2011-01-01
... 15 Commerce and Foreign Trade 1 2011-01-01 2011-01-01 false How does a debtor request a special....18 Section 19.18 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.18 How does a debtor request a special review based on a...
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Code of Federal Regulations, 2012 CFR
2012-01-01
... 15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01 false How does a debtor request a special....18 Section 19.18 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.18 How does a debtor request a special review based on a...
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Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 1 2010-01-01 2010-01-01 false How does a debtor request a special....18 Section 19.18 Commerce and Foreign Trade Office of the Secretary of Commerce COMMERCE DEBT COLLECTION Procedures To Collect Commerce Debts § 19.18 How does a debtor request a special review based on a...
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Sakaida, Satoshi; Shimokawa, Yohei; Asaka, Toru
2015-07-15
Highlights: • Eu{sup 3+}-doped CaZrO{sub 3}-based compounds were synthesized by the solid state reaction. • PL emission intensity at 614 nm was changed by the second dopant cations. • The site substituted by Eu{sup 3+} cations was investigated by using XRD and ALCHEMI technique. • The dominant Eu{sup 3+} substitution site was found as the B site (Zr{sup 4+}) in the CaZrO{sub {sup 3}}. • The dominant Eu{sup 3+} substitution site could be strongly influenced by the co-dopants. - Abstract: Eu{sup 3+}-doped CaZrO{sub 3}, SrZrO{sub 3}, and Mg{sup 2+}- or Sr{sup 2+}-co-doped CaZrO{sub 3} were synthesized by conventional solid statemore » reaction and their photoluminescence (PL) properties were characterized. The Eu{sup 3+}-doped CaZrO{sub 3}-based compounds exhibited characteristic emissions of Eu{sup 3+} (f–f transition). The intensity of the main PL emission peak at 614 nm increased with Mg{sup 2+} co-doping, while it decreased with the amount of co-doped Sr{sup 2+}. The site substituted by Eu{sup 3+} cations in the CaZrO{sub 3}-based compounds was investigated by X-ray diffraction analysis and energy-dispersive X-ray analysis based on the electron channeling effects in transmission electron microscopy. The Eu{sup 3+} cations were determined to occupy mainly the B site (Zr{sup 4+}) in CaZrO{sub 3}. The dominant Eu{sup 3+} substitution site was also strongly influenced by the co-dopant, and the ionic radius of the co-dopant was identified as an important factor that determines the dominant Eu{sup 3+} substitution site.« less
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Ghorai, Shyamal Kr; Samanta, Swarna Kamal; Mukherjee, Manini; Saha Sardar, Pinki; Ghosh, Sanjib
2013-02-04
A simple ternary system containing a protein [human serum albumin (HSA)/bovine serum albumin (BSA)], tetracycline hydrochloride (TC), and Eu(III) in suitable aqueous buffer medium at physiological pH (= 7.2) has been shown to exhibit highly efficient "antenna effect" compared to the binary complex of TC with Eu(III) (Eu(3)TC). The ternary system containing E. coli alkaline phosphatase (AP), TC, and Eu(III), however, shows a slight enhancement of Eu(III) emission, although the binding constant of AP with TC is 2 orders of magnitude greater than with BSA/HSA. The enhanced emission of bound TC in the binary systems containing proteins and TC gets quenched in the ternary systems containing HSA/BSA, showing the efficient energy transfer (ET) from TC to Eu(III). Steady state and time-resolved emission studies of each component in all the ternary systems in H(2)O and in D(2)O medium reveal that Eu(III) is very well protected from the O-H oscillator in the ternary system containing HSA/BSA compared to that containing AP. The docking studies locating the binding site of TC in the proteins suggest that TC binds near the surface of AP. In the case of HSA/BSA, TC resides in the interior of the protein resulting in a large shielding effect of Eu(III). The rotational correlation time (θ(c)) determined from the anisotropy decay of bound TC in the complexes and the accessible surface area (ASA) of the ligand in the complexes obtained from the docking studies also support the contention that Eu(3)TC is more exposed to solvent in the case of the ternary system consisting of AP, TC, and Eu(III). The calculated radiative lifetime and the sensitization efficiency ratio of Eu(III) in all the systems clearly demonstrate the protein mediated tuning of "antenna effect" in Eu(III).
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Zhang, Xinguo, E-mail: sysuzxg@gmail.com; School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004; Fu, Xionghui
Highlights: • A series of color-tunable LuBO{sub 3}: Ce{sup 3+}/Tb{sup 3+}/Eu{sup 3+} phosphors were synthesized. • Phosphors exhibit strong blue/green/red emission under UV excitation. • The reason of high Tb{sup 3+} content required for Ce{sup 3+} → Tb{sup 3+} → Eu{sup 3+} energy transfer is unveiled. • Green and red LED prototypes were fabricated and characterized. - Abstract: A series of LuBO{sub 3}: Ce{sup 3+}/Tb{sup 3+}/Eu{sup 3+} phosphors were synthesized via solid state reaction. The Ce{sup 3+}/Tb{sup 3+} co-doped and Ce{sup 3+}/Tb{sup 3+}/Eu{sup 3+} tri-doped phosphors absorb near UV light through 4f-5d transitions of Ce{sup 3+}, followed by sensitized Tb{supmore » 3+} green and Eu{sup 3+} red emission. Decay curves investigations for samples with various Tb{sup 3+} and Eu{sup 3+} contents reveal the occurrence of Ce{sup 3+} → Tb{sup 3+} → Eu{sup 3+} energy transfer. It is found that due to relative low Tb{sup 3+} → Eu{sup 3+} energy transfer rate, a high Tb{sup 3+} content (>40%) is required for efficient Ce{sup 3+} → Tb{sup 3+} → Eu{sup 3+} energy transfer. Emission color of LuBO{sub 3}: Ce{sup 3+}, Tb{sup 3+}, Eu{sup 3+} varies from blue through green to red with Ce{sup 3+}/Tb{sup 3+}/Eu{sup 3+} ratio. The quantum efficiency of LuBO{sub 3}: Ce{sup 3+}, Tb{sup 3+} green phosphor and LuBO{sub 3}: Ce{sup 3+}, Tb{sup 3+}, Eu{sup 3+} red phosphor is 50% and 30%, respectively. Green and red LED prototypes were fabricated. The results show that the obtained phosphors are potential candidates as down-converted phosphors for NUV LEDs.« less
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NASA Astrophysics Data System (ADS)
Rodríguez-Carvajal, David A.; Meza-Rocha, A. N.; Caldiño, U.; Lozada-Morales, R.; Álvarez, E.; Zayas, Ma. E.
2016-11-01
Eu3+, Dy3+ and Dy3+/Eu3+ doped CdO-GeO2-TeO2 glasses were prepared using the melt-quenching process and analyzed by X-diffraction, Raman spectroscopy, excitation and emission spectra, and emission decay time profiles. The lack of X ray diffraction peaks revealed that all samples are amorphous. Vibrational modes associated with Tesbnd Osbnd Te and Gesbnd Osbnd Ge related bonds and molecular oxygen were detected by Raman spectroscopy. The luminescence characteristics were studied upon excitations that correspond with the emission of InGaN (370-420 nm) based LEDs. The Eu3+ singly doped glass displayed reddish-orange global emission, with x = 0.601 and y = 0.349 CIE1931 chromaticity coordinates, upon 393 nm excitation. Neutral emission with x = 0.373 and y = 0.412 CIE1931 chromaticity coordinates and correlated color temperature (CCT) of 4400 K, was achieved in the Dy3+ singly doped glass excited at 388 nm. The Dy3+/Eu3+ co-doped glass exhibited warm, neutral and soft warm white emissions with CCT values of 3435, 4153 and 2740 K, under excitations at 382, 388 and 393 nm, respectively, depending mainly on the Dy3+ and Eu3+ relative excitation. The Dy3+ excitation bands observed in the Dy3+/Eu3+ glass by monitoring the 611 nm Eu3+ emission, suggest that Dy3+ → Eu3+ energy transfer takes place, despite the fact that the Dy3+ emission decays in the Dy3+ and Dy3+/Eu3+ doped glass, remain without changes. The shortening of Eu3+ decay in presence of Dy3+ was attributed to an Eu3+ → Dy3+ non-radiative energy transfer process, which according with the Inokuti-Hirayama model might be dominated through an electric quadrupole-quadrupole interaction, with efficiency and probability of 5.5% and 51.6 s-1, respectively.
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NASA Astrophysics Data System (ADS)
Singh, N. Shanta; Ningthoujam, R. S.; Devi, L. Romila; Yaiphaba, N.; Sudarsan, V.; Singh, S. Dorendrajit; Vatsa, R. K.; Tewari, R.
2008-11-01
Nanoparticles of GdVO4 doped with Eu3+ and core/shell of GdVO4:Eu3+/GdVO4 are prepared by urea hydrolysis method using ethylene glycol as capping agent as well as reaction medium at 130 °C. Unit cell volume increases when GdVO4 is doped with Eu3+ indicating the substitution of Gd3+ lattice sites by Eu3+. From luminescence study, it is confirmed that there is no particle size effect on emission positions of Eu3+. Optimum luminescence intensity is found to be in 5-10 at. % Eu3+. Above these concentrations, luminescence intensity decreases due to concentration quenching effect. There is an enhancement in luminescence intensity of core/shell nanoparticles. This has been attributed to the reduction in surface inhomogenities of Eu3+ surroundings by bonding to GdVO4 shell. The lifetime for D50 level increases with annealing and core/shell formation.
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Red Luminescent Eu(III) Coordination Bricks Excited on Blue LED Chip.
Koizuka, Toru; Yanagisawa, Kei; Hirai, Yuichi; Kitagawa, Yuichi; Nakanishi, Takayuki; Fushimi, Koji; Hasegawa, Yasuchika
2018-06-18
Three types of red luminescent Eu(III) complexes with Schiff base and hfa ligands (hfa: hexafluoroacetylacetonate), mononuclear [Eu(hfa) 2 (OAc)(salen) 2 ] (OAc: acetate anion, salen: N,N'-bis(salicylidene)ethylenediamine), brick-type [Eu 2 (hfa) 4 (OAc) 2 (salbn) 2 ] (salbn: N,N'-bis(salicylidene)-1,4-butanediamine), and polynuclear [Eu(hfa) 2 (OAc)(salhen)] n (salhen: N,N'-bis(salicylidene)-1,6-hexanediamine) are reported for white light-emitting diode (LED) devices. Among these complexes, brick-type [Eu 2 (hfa) 4 (OAc) 2 (salbn) 2 ] excited by blue light (460 nm) exhibits the photosensitized quantum yield (Φ π-π* = 47%) and remarkably high efficiency of sensitization (η sens = 96%). The efficiency of sensitization is caused by the excited state based on ligand-ligand interaction between the Schiff base and hfa ligands in Eu(III) complexes. To fabricate LED devices, the red luminescent [Eu 2 (hfa) 4 (OAc) 2 (salbn) 2 ] was mounted on an InGaN blue LED chip.
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Effect of annealing on structural and luminescence properties of Eu3+ doped NaYF4 phosphor
NASA Astrophysics Data System (ADS)
Pathak, Trilok K.; Kumar, Ashwini; Swart, H. C.; Kroon, R. E.
2018-04-01
Eu3+ doped NaYF4 phosphors have been synthesized by the combustion method. The effect of annealing on the structural, morphological and luminescence properties has been investigated. X-ray diffraction analysis revealed that the Eu3+ doped NaYF4 phosphors consisted of mixed phases: α-phase and β-phase which were affected by the annealing of the phosphor. The surface morphology showed a significant change with annealing in the Eu3+ doped NaYF4 phosphors. The elemental mapping and energy dispersive X-ray spectroscopy spectra proved the formation of the desired materials. The photoluminescence spectra illustrated the optical properties of Eu3+ in the as-prepared and annealed Eu3+ doped NaYF4 phosphors. The intensity of the peaks 5D0 → 7F2 and 5D0 → 7F1 varied in as-prepared and annealed samples. The lifetime of the Eu3+ luminescence at 615 nm was also weakly affected by the Eu3+ doping and annealing temperature.
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Why study EU foreign policy at all? A response to Keuleers, Fonck and Keukeleire
Dijkstra, Hylke; Vanhoonacker, Sophie
2016-01-01
In an important article on the state of European Union (EU) foreign policy research, Keuleers, Fonck and Keukeleire show that academics excessively focus on the study of the EU foreign policy system and EU implementation rather than the consequences of EU foreign policy for recipient countries. While the article is empirical, based on a dataset of 451 published articles on EU foreign policy, the normative message is that it is time to stop ‘navel-gazing’ and pay more attention to those on the receiving end of EU foreign policy. We welcome this contribution, but wonder why certain research questions have been privileged over others. We argue that this has primarily to do with the predominant puzzles of the time. We also invite Keuleers, Fonck and Keukeleire to make a theoretical case for a research agenda with more attention to outside-in approaches. We conclude by briefly reflecting on future research agendas in EU foreign policy. PMID:28546641
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Sheaff, R
1997-12-01
European Union (EU) policy on mobility requires ensuring healthcare access for EU residents who travel between EU states. This case-study investigates how this policy has been implemented in respect of EU visitors to the UK. EU visitors to the UK have similar access to 'immediately needed' National Health Service (NHS) healthcare to UK residents. For non-urgent healthcare, the NHS has official systems to discourage 'medical tourism' and divert such patients to the private sector or to reclaim the costs of NHS hospital treatment for EU visitors. Yet these official systems contrast with the flexibility and liberality of actual NHS practice towards EU visitors. Research on health policy implementation mostly examines reasons for 'implementation failure'. However, the present study indicates a health policy being implemented more fully than policy-makers may have anticipated. In the case of healthcare access for EU visitors to the UK, an implementation surplus is evident rather than an implementation deficit.
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Ho, Wen-Jeng; Shen, Yu-Tang; Liu, Jheng-Jie; You, Bang-Jin; Ho, Chun-Hung
2017-10-21
This paper demonstrates the application of a broadband luminescent downshifting (LDS) layer with multiple species of europium (Eu)-doped silicate phosphors using spin-on film technique to enhance the photovoltaic efficiency of crystalline silicon solar cells. The surface morphology of the deposited layer was examined using a scanning electron microscope (SEM). The chemical composition of the Eu-doped silicate phosphors was analyzed using energy-dispersive X-ray spectroscopy (EDS). The fluorescence emission of the Eu-doped silicate phosphors was characterized using photoluminescence (PL) measurements at room temperature. We also compared the optical reflectance and external quantum efficiency (EQE) response of cells with combinations of various Eu-doped phosphors species. The cell coated with two species of Eu-doped phosphors achieved a conversion efficiency enhancement (∆ η ) of 19.39%, far exceeding the ∆ η = 15.08% of the cell with one species of Eu-doped phosphors and the ∆ η = 8.51% of the reference cell with the same silicate layer without Eu-doped phosphors.
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Mutational analysis of the major soybean UreF paralogue involved in urease activation.
Polacco, Joe C; Hyten, David L; Medeiros-Silva, Mônica; Sleper, David A; Bilyeu, Kristin D
2011-06-01
The soybean genome duplicated ∼14 and 45 million years ago and has many paralogous genes, including those in urease activation (emplacement of Ni and CO(2) in the active site). Activation requires the UreD and UreF proteins, each encoded by two paralogues. UreG, a third essential activation protein, is encoded by the single-copy Eu3, and eu3 mutants lack activity of both urease isozymes. eu2 has the same urease-negative phenotype, consistent with Eu2 being a single-copy gene, possibly encoding a Ni carrier. Unexpectedly, two eu2 alleles co-segregated with missense mutations in the chromosome 2 UreF paralogue (Ch02UreF), suggesting lack of expression/function of Ch14UreF. However, Ch02UreF and Ch14UreF transcripts accumulate at the same level. Further, it had been shown that expression of the Ch14UreF ORF complemented a fungal ureF mutant. A third, nonsense (Q2*) allelic mutant, eu2-c, exhibited 5- to 10-fold more residual urease activity than missense eu2-a or eu2-b, though eu2-c should lack all Ch02UreF protein. It is hypothesized that low-level activation by Ch14UreF is 'spoiled' by the altered missense Ch02UreF proteins ('epistatic dominant-negative'). In agreement with active 'spoiling' by eu2-b-encoded Ch02UreF (G31D), eu2-b/eu2-c heterozygotes had less than half the urease activity of eu2-c/eu2-c siblings. Ch02UreF (G31D) could spoil activation by Chr14UreF because of higher affinity for the activation complex, or because Ch02UreF (G31D) is more abundant than Ch14UreF. Here, the latter is favoured, consistent with a reported in-frame AUG in the 5' leader of Chr14UreF transcript. Translational inhibition could represent a form of 'functional divergence' of duplicated genes.
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DOE Office of Scientific and Technical Information (OSTI.GOV)
Li, Ting; Li, Panlai, E-mail: li_panlai@126.com; Fu, Nian, E-mail: funian3678@163.com
A series of Dy{sup 3+}, Ce{sup 3+}/Dy{sup 3+}, Eu{sup 2+}/Dy{sup 3+} and Ce{sup 3+}/Eu{sup 2+}/Dy{sup 3+} doping LiBaB{sub 9}O{sub 15} (LBB) phosphors were synthesized via a high temperature solid-state method. LBB:Dy{sup 3+} cannot create light under ultraviolet radiation, however, LBB:Ce{sup 3+}, Dy{sup 3+} can produce yellow emission under 295 nm excitation. The energy transfer occurs from Ce{sup 3+} to Dy{sup 3+} ions via electric dipole-dipole interaction and the critical distance is estimated to be 21.15 Å based on concentration quenching model. Generally, Eu{sup 2+} ion is a sensitizer to Dy{sup 3+} ion, however, there is only the emission of Eu{supmore » 2+} in LBB:Eu{sup 2+}, Dy{sup 3+}, which means there is no energy transfer from Eu{sup 2+} to Dy{sup 3+} ions. Interestingly enough, when doping Eu{sup 2+} ion into LBB:Ce{sup 3+}, Dy{sup 3+}, white emission can be achieved by increase the blue (350–425 nm) emission intensity. The spectral property, quantum efficiency, CIE chromaticity coordinates and thermal quenching property of LBB:Ce{sup 3+}, Eu{sup 2+}, Dy{sup 3+} are investigated. The results indicate that LBB:Ce{sup 3+}, Eu{sup 2+}, Dy{sup 3+} may be a potential application to white light emitting diodes. - Graphical abstract: LBB:Ce{sup 3+}, Dy{sup 3+} can create white emission by doping Eu{sup 2+} ions. - Highlights: • LBB:Ce{sup 3+}, Dy{sup 3+} can produce white emission by doping Eu{sup 2+} ion. • There is no energy transfer from Eu{sup 2+} to Dy{sup 3+} ions. • Energy transfer occurs from Ce{sup 3+} to Dy{sup 3+} ions. • LBB:Ce{sup 3+}, Eu{sup 2+}, Dy{sup 3+} may be a potential application for white LEDs.« less
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Mutational analysis of the major soybean UreF paralogue involved in urease activation
Polacco, Joe C.; Hyten, David L.; Medeiros-Silva, Mônica; Sleper, David A.; Bilyeu, Kristin D.
2011-01-01
The soybean genome duplicated ∼14 and 45 million years ago and has many paralogous genes, including those in urease activation (emplacement of Ni and CO2 in the active site). Activation requires the UreD and UreF proteins, each encoded by two paralogues. UreG, a third essential activation protein, is encoded by the single-copy Eu3, and eu3 mutants lack activity of both urease isozymes. eu2 has the same urease-negative phenotype, consistent with Eu2 being a single-copy gene, possibly encoding a Ni carrier. Unexpectedly, two eu2 alleles co-segregated with missense mutations in the chromosome 2 UreF paralogue (Ch02UreF), suggesting lack of expression/function of Ch14UreF. However, Ch02UreF and Ch14UreF transcripts accumulate at the same level. Further, it had been shown that expression of the Ch14UreF ORF complemented a fungal ureF mutant. A third, nonsense (Q2*) allelic mutant, eu2-c, exhibited 5- to 10-fold more residual urease activity than missense eu2-a or eu2-b, though eu2-c should lack all Ch02UreF protein. It is hypothesized that low-level activation by Ch14UreF is ‘spoiled’ by the altered missense Ch02UreF proteins (‘epistatic dominant-negative’). In agreement with active ‘spoiling’ by eu2-b-encoded Ch02UreF (G31D), eu2-b/eu2-c heterozygotes had less than half the urease activity of eu2-c/eu2-c siblings. Ch02UreF (G31D) could spoil activation by Chr14UreF because of higher affinity for the activation complex, or because Ch02UreF (G31D) is more abundant than Ch14UreF. Here, the latter is favoured, consistent with a reported in-frame AUG in the 5' leader of Chr14UreF transcript. Translational inhibition could represent a form of ‘functional divergence’ of duplicated genes. PMID:21430294
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High-Precision Measurement of Eu/Eu* in Geological Glasses via LA-ICP-MS Analysis
NASA Technical Reports Server (NTRS)
Tang, Ming; McDonough, William F.; Arevalo, Ricardo, Jr.
2014-01-01
Elemental fractionation during laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis has been historically documented between refractory and volatile elements. In this work, however, we observed fractionation between light rare earth elements (LREEs) and heavy rare earth elements (HREEs) when using ablation strategies involving large spot sizes (greater than 100 millimeters) and line scanning mode. In addition: (1) ion yields decrease when using spot sizes above 100 millimeters; (2) (Eu/Eu*)(sub raw) (i.e. Europium anomaly) positively correlates with carrier gas (He) flow rate, which provides control over the particle size distribution of the aerosol reaching the ICP; (3) (Eu/Eu*)(sub raw) shows a positive correlation with spot size, and (4) the changes in REE signal intensity, induced by the He flow rate change, roughly correlate with REE condensation temperatures. The REE fractionation is likely driven by the slight but significant difference in their condensation temperatures. Large particles may not be completely dissociated in the ICP and result in preferential evaporation of the less refractory LREEs and thus non-stoichiometric particle-ion conversion. This mechanism may also be responsible for Sm-Eu-Gd fractionation as Eu is less refractory than Sm and Gd. The extent of fractionation depends upon the particle size distribution of the aerosol, which in turn is influenced by the laser parameters and matrix. Ablation pits and lines defined by low aspect ratios produce a higher proportion of large particles than high aspect ratio ablation, as confirmed by measurements of particle size distribution in the laser induced aerosol. Therefore, low aspect ratio ablation introduces particles that cannot be decomposed and/or atomized by the ICP and thus results in exacerbated elemental fractionation. Accurate quantification of REE concentrations and Eu/Eu* requires reduction of large particle production during laser ablation. For the reference materials analyzed in this work, the 100 millimeters spot measurements of Eu/Eu* agreed with GeoRem preferred values within 3 percent. Our long-term analyses of Eu/Eu* in MPI-DING glass KL-2G and USGS glass BIR-1G were reproducible at 3 percent (2 RSD).
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15 CFR 990.13 - Rebuttable presumption.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Rebuttable presumption. 990.13 Section 990.13 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE OIL POLLUTION ACT REGULATIONS...
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15 CFR 990.26 - Emergency restoration.
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2010-01-01
... 15 Commerce and Foreign Trade 3 2010-01-01 2010-01-01 false Emergency restoration. 990.26 Section 990.26 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued) NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE OIL POLLUTION ACT REGULATIONS...
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Code of Federal Regulations, 2010 CFR
2010-01-01
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15 CFR 806.5 - Confidentiality.
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15 CFR 325.15 - Relinquishing a certificate.
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15 CFR 325.16 - Protecting confidentiality of information.
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15 CFR 325.4 - Calculating time periods.
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15 CFR 325.7 - Amending the certificate.
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15 CFR 325.5 - Issuing the certificate.
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15 CFR 325.11 - Judicial review.
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15 CFR 752.15 - Export clearance.
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15 CFR 752.15 - Export clearance.
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15 CFR 752.15 - Export clearance.
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DOT National Transportation Integrated Search
1997-10-01
In order to provide waterborne commerce information as soon as possible, the Waterborne Commerce Statistics Center (WCSC) has prepared this summary document of estimated waterborne commerce statistics for calendar year 1996. The foreign import and ex...
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DOT National Transportation Integrated Search
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15 CFR 1160.7 - Amendment of procedures.
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15 CFR 1160.27 - Amendment of procedures.
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15 CFR 1160.27 - Amendment of procedures.
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15 CFR 1160.7 - Amendment of procedures.
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15 CFR 700.60 - General provisions.
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49 CFR 171.2 - General requirements.
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