A5030748404- Thermal Radiation and Cooling Technologies
- solar cell performance optimization
- Advanced Thermodynamics and Statistical Mechanics
- Solar Thermal and Photovoltaic Systems
- Photovoltaic System Optimization Techniques
- Radiation Dose and Imaging
- Atmospheric Ozone and Climate
- Aerogels and thermal insulation
- Quantum Electrodynamics and Casimir Effect
- Solar-Powered Water Purification Methods
- Transition Metal Oxide Nanomaterials
- Metamaterials and Metasurfaces Applications
- Advanced Radiotherapy Techniques
- Thermal properties of materials
- Iron oxide chemistry and applications
- Material Science and Thermodynamics
- Copper-based nanomaterials and applications
- Building Energy and Comfort Optimization
- Radiative Heat Transfer Studies
- Strong Light-Matter Interactions
- Greenhouse Technology and Climate Control
- Health, Environment, Cognitive Aging
- Catalytic Processes in Materials Science
- Advanced Thermodynamic Systems and Engines
- Advanced Photocatalysis Techniques
Memorial Sloan Kettering Cancer Center
2022-2024
Massachusetts Institute of Technology
2013-2021
A high‐temperature stable solar absorber based on a metallic 2D photonic crystal (PhC) with high and tunable spectral selectivity is demonstrated optimized for range of operating temperatures irradiances. In particular, PhC absorptance 0.86 thermal emittance = 0.26 at 1000 K, using material properties, achieved resulting in transfer efficiency more than 50% higher that blackbody absorber. Furthermore, an integrated double‐sided absorber/emitter pair high‐performance thermophotovoltaic (STPV)...
The study of One Million U.S. Radiation Workers and Veterans, the Person Study (MPS), examines health consequences, both cancer non-cancer, exposure to ionizing radiation received gradually over time. Recently MPS has focused on mortality patterns from neurological behavioral conditions, e.g., Parkinson's disease, Alzheimer's dementia, motor neuron disease such as amyotrophic lateral sclerosis. A fuller picture radiation-related late effects comes studying occurrence (incidence) conditions...
Utilizing the full solar spectrum is desirable to enhance conversion efficiency of a power generator. In practice, this can be achieved through spectral splitting between multiple converters in parallel. However, it unclear which wavelength bands should directed each converter order maximize efficiency. We developed model an ideal hybrid utilizes both single-junction photovoltaic cell and thermal engine. determined limiting efficiencies strategy corresponding optimum bandwidth cell. This...
To bridge the gap between theoretically predicted and experimentally demonstrated efficiencies of solar thermophotovoltaics (STPVs), we consider impact spectral non-idealities on efficiency optimal design STPVs over a range PV bandgaps (0.45-0.80 eV) optical concentrations (1-3,000x).On emitter side, show that suppressing or recycling sub-bandgap radiation is critical.On absorber relative importance high absorptance versus low thermal emittance depends energy balance.Both results are...
Radioactive seed localization (RSL) provides a precise and efficient method for removing non-palpable breast lesions. It has proven to be valuable addition surgery, improving perioperative logistics patient satisfaction. This retrospective review examines the lessons learned from high-volume cancer center's RSL program after 10 years of practice over 25 000 cases. We provide an updated model assessing patient's radiation dose implantation demonstrate safety staff members. Additionally, we...
Hematite holds promise for photoelectrochemical (PEC) water splitting due to its stability, low-cost, abundance and appropriate bandgap. However, it suffers from a mismatch between the hole diffusion length light penetration length. We have theoretically designed characterized an ultrathin planar hematite/silver nanohole array/silver substrate photoanode. Due supported destructive interference surface plasmon resonance, photons are efficiently absorbed in hematite film. Compared with...
Thermal runaway occurs when a rise in system temperature results heat generation rates exceeding dissipation rates. Here we demonstrate that thermal radiative systems, given sufficient level of negative differential emission. By exploiting the insulator-to-metal phase transition vanadium dioxide, show small increase (e.g., 10 nW/mm2) can result large change surface ~35 K), as emitter switches from high emissivity to low emissivity. While is typically associated with catastrophic failure...
We have demonstrated world-record thermophotovoltaic (TPV) conversion efficiency in two materials systems operating at different thermal emitter temperatures. A GaAs-based PV device under a 2330 °C produced an of (31 ± 2)%, and In <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.53</sub> Ga xmlns:xlink="http://www.w3.org/1999/xlink">0.47</sub> As -based 1300 (30 2)%. The electrical output power densities the cells were 2.45 W/cm <sup...
Abstract External dose rates were measured 1 m away from 230 Lu-177 patients to characterise the variability in normalised as a function of administered activity, body mass index (BMI) and sex. The largest rate observed was 0.07 mSv/h associated with an activity 7.2 GBq. Substantial found distribution that had average 0.0037 per GBq 95% confidence interval 0.0024–0.0058 Based on this study, estimating patient based gamma exposure factor overestimates by 2. A statistically significant inverse...
We present a novel solar thermophotovoltaic (STPV) device, which for the first time, incorporates two-dimensional photonic-crystal (2D PhC) absorber-emitter to achieve spectral conversion efficiencies >10%. These results were achieved by tailoring properties of through surface nanostructuring tantalum (Ta) and minimizing parasitic thermal losses an innovative vacuum-enclosed experimental setup. By incorporating sub-bandgap photon reflecting filter on PV optimizing ratio, we how demonstrated...
Thermophotovoltaic (TPV) devices convert thermal radiation directly into electricity using semiconductor diodes and have a variety of uses from waste heat recovery to energy storage primary power conversion. Recent results demonstrated promising cells nearing surpassing 30% conversion efficiency. As TPV continue increase in efficiency, they become attractive for wider range applications. Their efficiencies must be quantified standardized fashion compare accurately across research groups....
Solar energy has been an important component of the world's infrastructure for many years, but certain limitations have hindered its ability to become a primary source of renewable energy. In particular, intermittency and fundamental limitations on conversion efficiency restricted adoption of direct photovoltaic with PV cells. Recent developments in more advanced cell chemistries concentrated solar power systems (CSP) seek address some these limitations enable higher grid penetration derived...
We provide an overview of the impact using nanostructured surfaces to improve performance solar thermophotovoltaic (STPV) energy conversion and condensation systems. demonstrated STPV system efficiencies up 3.2%, compared ≤1% reported in literature, made possible by nanophotonic engineering absorber emitter. For systems, we showed enhanced scalable superhydrophobic nanostructures via jumping-droplet condensation. Furthermore, observed that these jumping droplets carry a residual charge which...
Thermophotovoltaics are promising solid-state energy converters for a variety of applications such as grid-scale storage, concentrating solar-thermal power, and waste heat recovery. Here, we report the design, fabrication, testing large area (0.8 cm$^2$), scalable, single junction 0.74-eV GaInAs thermophotovoltaic devices reaching an efficiency 38.8$\pm$2.0% electrical power density 3.78 W/cm$^2$ at emitter temperature 1850{\deg}C. Reaching high without sacrificing is direct result combining...