Search results for: John A. Turner

Items from 1 to 20 out of 57 results

article

China’s development of a multi‐tier pension system

Tianhong Chen, John A. Turner

International Social Security Review > 74 > 1 > 35 - 58

China has made a number of major changes to its pension system in the period 2014–2020, and is in the process of establishing a multi‐tier old‐age pension system, consisting of programmes provided by the government, voluntary programmes provided by enterprises, and voluntary programmes established by individuals. Policy objectives are to reduce the fragmentation in its pension system; deal with population...

article

Fragmentation of copper current collectors in Li-ion batteries during spherical indentation

Hsin Wang, Thomas R. Watkins, Srdjan Simunovic, Philip R. Bingham, more

Journal of Power Sources > 2017 > 364 > C > 432-436

Large, areal, brittle fracture of copper current collector foils has been observed by 3D x-ray computed tomography (XCT) of a spherically indented Li-ion cell. This fracture is hidden and non-catastrophic to a degree because the graphite layers deform plastically, and hold the materials together so that the cracks in the foils cannot be seen under optical and electron microscopy. The cracking of copper...

article

Mechanical behavior and failure mechanisms of Li-ion battery separators

Sergiy Kalnaus, Yanli Wang, John A. Turner

Journal of Power Sources > 2017 > 348 > C > 255-263

Anisotropic mechanical properties were experimentally determined and compared for three types of commercially available Li-ion battery separators: Celgard 2325, Celgard PP2075 dry-processed polymer separators, and DreamWeaver Gold 40 non-woven separator. Significant amount of anisotropy of properties was determined, with the Young's modulus being different by up to a factor of 5 and ultimate strength...

article

Progressive mechanical indentation of large-format Li-ion cells

Hsin Wang, Abhishek Kumar, Srdjan Simunovic, Srikanth Allu, more

Journal of Power Sources > 2017 > 341 > C > 156-164

Large format Li-ion cells were used to study the mechanical responses of single cells of thickness 6.5 mm and stacks of three cells under compressive loading. Various sequences of increasing depth indentations were carried out using a 1.0 inch (25.4 mm) diameter steel ball with steel plate as a rigid support surface. The indentation depths were between 0.025″ and 0.250″ with main indentation increments...

article

The Virtual Environment for Reactor Applications (VERA): Design and architecture☆☆Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.

John A. Turner, Kevin Clarno, Matt Sieger, Roscoe Bartlett, more

Journal of Computational Physics > 2016 > 326 > C > 544-568

VERA, the Virtual Environment for Reactor Applications, is the system of physics capabilities being developed and deployed by the Consortium for Advanced Simulation of Light Water Reactors (CASL). CASL was established for the modeling and simulation of commercial nuclear reactors. VERA consists of integrating and interfacing software together with a suite of physics components adapted and/or refactored...

chapter

The Use of Heteropoly Acids in Proton Exchange Fuel Cells

Sonny Sachdeva, John A. Turner, James L. Horan, Andrew M. Herring

Structure and Bonding > Fuel Cells and Hydrogen Storage > 115-168

In this chapter, we discuss the proton conductivity and use of heteropoly acids (HPAs) in proton exchange fuel cells. We first review the fundamental aspects of proton conduction in the HPAs and then review liquid HPA-based fuel cells. Four types of composite proton exchange membranes containing HPAs have been identified: HPAs imbibed perfluorosulfonic acid membranes, HPAs imbibed hydrocarbon membranes,...

article

Longevity insurance annuities: China adopts a benefit innovation from the past

Tianhong Chen, John A. Turner

International Social Security Review > 68 > 2 > 27 - 41

Longevity insurance annuities are deferred annuities that begin payment at advanced older ages, such as at age 80. Such annuities would benefit some older retirees who have drawn down their savings, but the private sector has problems in providing them. Originally, social insurance old‐age benefits programmes in some countries were structured as longevity insurance programmes, with 50 per cent or...

article

Degradation of SS316L bipolar plates in simulated fuel cell environment: Corrosion rate, barrier film formation kinetics and contact resistance

Dionissios D. Papadias, Rajesh K. Ahluwalia, Jeffery K. Thomson, Harry M. Meyer, more

Journal of Power Sources > 2015 > 273 > C > 1237-1249

A potentiostatic polarization method is used to evaluate the corrosion behavior of SS316L in simulated anode and cathode environments of polymer electrolyte fuel cells. A passive barrier oxide film is observed to form and reach steady state within ∼10 h of polarization, after which time the total ion release rates are low and nearly constant at ∼0.4 μg cm⁻² h⁻¹ for all potentials investigated. The...

article

The economics of complexity: complexity in the allocation of governmental authority for pensions

Gerard Hughes, John A. Turner, Michelle Maher

Journal of Economics and Management > 2015 > 21 > 21-34

Are simpler governmental institutional structures generally better? This paper analyzes the effects of complexity in the allocation of government regulatory authority for pensions on various outcomes, focusing on the ease with which participants, plan sponsors, and the regulated industry have in interacting with the regulator. We argue that the less complex allocation of regulatory authority for private...

article

Complexity in risks facing pension plans: nonmarket financial risk in the United States and Poland

Adam Samborski, John A. Turner

Journal of Economics and Management > 2015 > 21 > 35-57

This paper discusses agency, regulatory capture, counterparty and political risks as aspects of the nonmarket financial risks that pension plans and their participants bear, using as examples the United States and Poland. The intent of the paper is to expand beyond financial market risks the discussion of financial risks that pension plans and participants bear in funded pension systems. Thus, this...

article

Extending social security coverage to the rural sector in China

Tianhong Chen, John A. Turner

International Social Security Review > 67 > 1 > 49 - 70

In late 2009 China launched an innovative, voluntary programme that by 2011 had extended pension coverage to 326.4 million people in the rural sector, including contributors and beneficiaries. It requires one contribution per year and provides a flat‐rate benefit and a contributions‐related benefit through a contributory individual account, with a government guarantee that the benefit will continue...

article

A new open computational framework for highly-resolved coupled three-dimensional multiphysics simulations of Li-ion cells

Srikanth Allu, Sergiy Kalnaus, Wael Elwasif, Srdjan Simunovic, more

Journal of Power Sources > 2014 > 246 > C > 876-886

In this paper we report on the development and demonstration of physically consistent three-dimensional models for Lithium Ion Battery (LIB) cells. The discharge behavior of a LIB is a multiphysics and multiscale problem that is simulated using coupled models for thermal, electrical, and electrochemical phenomena. The individual physics models and software are integrated into a new open computational...

article

Trending in the Wrong Direction: Changes in Sleep Behaviors, Attitudes and Knowledge Over Time

Teri L. Turner, John A. Turner, Linzhi Xu, Mark A. Ward

Academic Pediatrics > 2013 > 13 > 4 > e7

article

Ausweitung der Deckung von Renten‐ und Sparplänen auf den informellen Sektor: Der Mbao Pension Plan in Kenia

Rose Musonye Kwena, John A. Turner

Internationale Revue für Soziale Sicherheit > 66 > 2 > 91 - 114

Der Mbao Pension Plan ist ein freiwilliger Sparplan mit individuellen Konten, an dem alle Arbeitnehmer in Kenia ungeachtet ihres Einkommens oder ihres Alters teilnehmen können. Ziel des Mbao Vorsorgeplans ist es, ein für die spezifischen Eigenschaften des informellen Sektors geeignetes Programm zur Verfügung zu stellen sowie eine Sparkultur bei diesen Arbeitnehmern zu fördern. Die wichtigste Neuerung...

article

Ampliación al sector informal de la cobertura del plan de ahorro y pensiones: el Plan Mbao de pensiones de Kenya

Rose Musonye Kwena, John A. Turner

Revista Internacional de Seguridad Social > 66 > 2 > 89 - 111

El Plan Mbao es un plan de pensiones basado en cuentas de ahorro individuales de carácter voluntario al que pueden contribuir todos los trabadores de Kenya con independencia de su nivel de ingresos o edad. Su finalidad es crear un programa adecuado a las singularidades del sector informal y fomentar la cultura del ahorro para quienes trabajan en él. Su novedad fundamental estriba en la facilidad que...

article

Elargir la couverture des régimes de pension et d'épargne au secteur informel: le régime de pension Mbao du Kenya

Rose Musonye Kwena, John A. Turner

Revue internationale de sécurité sociale > 66 > 2 > 85 - 106

Le régime de pension Mbao est un système de compte individuel d'épargne volontaire, auquel peuvent s’affilier tous les travailleurs kenyans, sans conditions de ressources ni d'âge. Il est conçu pour offrir un dispositif répondant aux particularités du secteur informel et pour encourager ces travailleurs à épargner. La principale innovation de ce régime porte sur le fait que les travailleurs gagnant...

article

Extending pension and savings scheme coverage to the informal sector: Kenya's Mbao Pension Plan

Rose Musonye Kwena, John A. Turner

International Social Security Review > 66 > 2 > 79 - 99

The Mbao Pension Plan is a voluntary individual account savings plan to which all workers in Kenya may contribute without regard to income or age. It is designed to provide a programme that is suitable for the unique nature of the informal sector and to encourage a savings culture for those workers. The key innovation is that low‐income workers can easily make small contributions at relatively low...

article

The stability of illuminated p-GaInP2 semiconductor photoelectrode

Heli Wang, Todd Deutsch, Adam Welch, John A. Turner

International Journal of Hydrogen Energy > 2012 > 37 > 19 > 14009- 14014

Thin p-GaInP ₂ films were tested 24 h in pH1 NH ₄ NO ₃ solution at AM 1.5 G, and compared to that tested in 3 M H ₂ SO ₄ . Optical, SEM and EDX investigations confirmed that the surface of the tested sample in pH1 NH ₄ NO ₃ was kept almost as that of an as-received one, while the sample tested in 3 M H ₂ SO ₄ experienced extensive...

article

Electrochemical nitridation of a stainless steel for PEMFC bipolar plates

Heli Wang, John A. Turner

International Journal of Hydrogen Energy > 2011 > 36 > 20 > 13008- 13013

AISI446 steel has been electrochemically nitrided in 0.1 M HNO ₃ + 0.5 M KNO ₃ solution at room temperature. XPS analysis revealed surface NH ₃ and a deeper nitride layer. The surface layer of the stainless steel modified by electrochemical nitridation was thus composed of a nitrogen-incorporated oxide film. The nitrided steel showed very low interfacial contact resistance...

article

Characterization and performance of UNS S63019 (21-4N) as bipolar plate material in a simulated polymer electrolyte membrane fuel cell environment

Andrew G. Howell, Heli Wang, Scott W. Cowley, John A. Turner

Journal of Power Sources > 2011 > 196 > 14 > 5922-5927

The austenitic stainless steel UNS S63019 was evaluated regarding its potential as bipolar plate material in a polymer electrolyte membrane fuel cell (PEMFC) environment. Segregated grains of niobium carbide (NbC _x ) were identified in polished cross-sections of the alloy, offering a possible pathway for enhanced electrical conductivity through the passive surface oxide. Additionally, the...

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INFONA - science communication portal

Search results for: John A. Turner

China’s development of a multi‐tier pension system

Fragmentation of copper current collectors in Li-ion batteries during spherical indentation

Mechanical behavior and failure mechanisms of Li-ion battery separators

Progressive mechanical indentation of large-format Li-ion cells

The Use of Heteropoly Acids in Proton Exchange Fuel Cells

Longevity insurance annuities: China adopts a benefit innovation from the past

Degradation of SS316L bipolar plates in simulated fuel cell environment: Corrosion rate, barrier film formation kinetics and contact resistance

The economics of complexity: complexity in the allocation of governmental authority for pensions

Complexity in risks facing pension plans: nonmarket financial risk in the United States and Poland

Extending social security coverage to the rural sector in China

A new open computational framework for highly-resolved coupled three-dimensional multiphysics simulations of Li-ion cells

Trending in the Wrong Direction: Changes in Sleep Behaviors, Attitudes and Knowledge Over Time

Ausweitung der Deckung von Renten‐ und Sparplänen auf den informellen Sektor: Der Mbao Pension Plan in Kenia

Ampliación al sector informal de la cobertura del plan de ahorro y pensiones: el Plan Mbao de pensiones de Kenya

Elargir la couverture des régimes de pension et d'épargne au secteur informel: le régime de pension Mbao du Kenya

Extending pension and savings scheme coverage to the informal sector: Kenya's Mbao Pension Plan

The stability of illuminated p-GaInP2 semiconductor photoelectrode

Electrochemical nitridation of a stainless steel for PEMFC bipolar plates

Characterization and performance of UNS S63019 (21-4N) as bipolar plate material in a simulated polymer electrolyte membrane fuel cell environment

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