Publications

Publications

Long-term strategic planning of inter-city fast charging infrastructure for battery electric vehicles

Journal: Transportation Research Part E: Logistics and Transportation Review

This study introduces a multistage chance-constrained stochastic model for strategic planning of battery electric vehicle (BEV) inter-city fast charging infrastructure. A mixed integer programming model is developed to determine where and when charging stations are opened, and how many chargers are required for each...

A rule-based expert system applied to moisture durability of building envelopes

Journal: SAGE Journals

The moisture durability of an envelope component such as a wall or roof is difficult to predict. Moisture durability depends on all the construction materials used, as well as the climate, orientation, air tightness, and indoor conditions. Modern building codes require more insulation and tighter construction but...

Catalytic Exhaust Gas Recirculation-Loop Reforming for High Efficiency in a Stoichiometric Spark-Ignited Engine through Thermochemical Recuperation and Dilution Limit Extension, Part 2: Engine Performance

Journal: Energy & Fuels

This is the second part of a two-part investigation of on-board catalytic fuel reforming to increase the brake efficiency of a multicylinder, stoichiometric spark-ignited (SI) engine. In Part 1 of the investigation, we analytically and experimentally characterized the energetics and kinetics of a candidate reforming...

A method for determining the optimal delivered hydrogen pressure for fuel cell electric vehicles

Journal: Applied Energy

Fuel cell electric vehicles (FCEVs) are considered an important part of a portfolio of options to address challenges in the transportation sector, including energy security and pollution reduction. The market success of FCEVs depends on standardization of key vehicle and infrastructure parameters, including the...

Evolutionary selection growth of two-dimensional materials on polycrystalline substrates

Journal: Nature Materials

There is a demand for manufacturing 2D materials with the ultimate quality of single crystals and arbitrary size. Usually, epitaxial growth is considered the method of choice1 in prepar-ing single crystalline thin films but it in turn requires single crystal substrates for deposition. Here we present a different...

Implications of Emerging Vehicle Technologies on Rare Earth Supply and Demand in the United States

Journal: Resources

We explore the long-term demand and supply potentials of rare earth elements in alternative energy vehicles (AEVs) in the United States until 2050. Using a stock-flow model, we compare a baseline scenario with scenarios that incorporate an exemplary technological innovation: a novel aluminum–cerium–magnesium alloy. We...

Experimental and analytical evaluation of a hydro-pneumatic compressed-air Ground-Level Integrated Diverse Energy Storage (GLIDES) system

Journal: Applied Energy

In recent times, there has been a significant increase in intermittent renewable electricity capacity additions to the generation mix. This, coupled with an aging electrical grid that is poorly equipped to handle the ensuing mismatch between generation and use, has created a strong need for flexible, advanced bulk...

Sustainable Transportation Program FY 2010 Annual Report

Introduction Oak Ridge National Laboratory leverages its state of the art facilities and its renowned engineering and scientific staff to “attack the fundamental science challenges posed by DOE’s missions and carrying out the translational work required to accelerate the delivery of solutions to the marketplace.”1...

Analyzing the impacts of a biogas-to-electricity purchase incentive on electric vehicle deployment with the MA3T vehicle choice model

Journal: Oak Ridge National Laboratory Report

In 2014, the EPA approved a biogas-to-electricity pathway under the Renewable Fuel Standard (RFS). However, no specific applications for this pathway have been approved to date (EPA, 2017). This analysis helps understand the impact of the pathway by representing the biogas-to-electricity pathway as a point of purchase...

Market-driven automotive industry compliance with fuel economy and greenhouse gas standards: Analysis based on consumer choice

Journal: Energy Policy

This study explored factors that affect market-driven compliance with both Corporate Average Fuel Economy (CAFE) and greenhouse gas (GHG) standards (together called the National Program) in the United States for phase I 2012–2016 and phase II 2017–2025. We considered a consumer-choice-based simulation approach, using...

Nanoscale tomography reveals the deactivation of automotive copper-exchanged zeolite catalysts

Journal: Nature Communications

Copper-exchanged zeolite chabazite (Cu-SSZ-13) was recently commercialized for the selective catalytic reduction of NO X with ammonia in vehicle emissions as it exhibits superior reaction performance and stability compared to all other catalysts, notably Cu-ZSM-5. Herein, the 3D distributions of Cu as well as...

Probing Multiscale Transport and Inhomogeneity in a Lithium-Ion Pouch Cell Using In Situ Neutron Methods

Journal: ACS Energy Letters

We demonstrate the lithiation process in graphitic anodes using in situ neutron radiography and diffraction in a single-layer pouch cell. The variation in neutron absorption contrast in graphite shows a direct correlation between the degree of lithiation and the discharge potential. The experimental neutron...

Fast formation cycling for lithium ion batteries

Journal: Journal of Power Sources

The formation process for lithium ion batteries typically takes several days or more, and it is necessary for providing a stable solid electrolyte interphase on the anode (at low potentials vs. Li/Li+) for preventing irreversible consumption of electrolyte and lithium ions. An analogous layer known as the cathode...

Development of a range-extended electric vehicle powertrain for an integrated energy systems research printed utility vehicle

Journal: Applied Energy

Rapid vehicle and powertrain development has become essential to for the design and implementation of vehicles that meet and exceed the fuel efficiency, cost, and performance targets expected by today’s consumer while keeping pace with reduced development cycle and more frequent product releases. Recently, advances in...

Strategy for Texture Management in Metals Additive Manufacturing

Journal: Journal of Materials

Additive manufacturing (AM) technologies have long been recognized for their ability to fabricate complex geometric components directly from models conceptualized through computers, allowing for complicated designs and assemblies to be fabricated at lower costs, with shorter time to market, and improved function....

Connected and Automated Vehicle Merging at Highway On-Ramps

Recognition of the necessity for connected and automated vehicles (CAVs) is gaining momentum. CAVs can improve both transportation network efficiency and safety through control algorithms that can harmonically use all existing information to coordinate the vehicles. This study addresses the problem of optimally...

Energy Impact of Different Penetrations of Connected and Automated Vehicles: A Preliminary Assessment

Previous research reported in the literature has shown the benefits of traffic coordination to alleviate congestion, and reduce fuel consumption and emissions. However, there are still many remaining challenges that need to be addressed before a massive deployment of fully automated vehicles. This paper aims to...

An Overview of Driver Feedback Systems for Efficiency and Safety

Driver feedback systems have the potential to improve driving safety and efficiency by providing instructions to drivers aimed at improving their driving style. There is already a rich body of available literature devoted to the derivation of energy efficient speed profiles to develop driver feedback or eco-driving...

Development and Evaluation of Speed Harmonization using Optimal Control Theory: A Simulation-Based Case Study at a Speed Reduction Zone

We address the problem of harmonizing the speed of an increasing number of vehicles on a highway in real time. The objective is to derive the optimal acceleration/deceleration of each vehicle that harmonizes the speed of an increasing number of vehicles at a speed reduction zone on the highway, under the hard safety...

Online Optimal Control of Connected Vehicles for Efficient Traffic Flow at Merging Roads

This paper addresses the problem of coordinating online connected vehicles at merging roads to achieve a smooth traffic flow without stop-and-go driving. We present a framework and a closed-form solution that optimize the acceleration profile of each vehicle in terms of fuel economy while avoiding collision with other...

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