Evaluation of materials for reversible solid-state and chemical CO 2 storage.

Abstract This study explores the feasibility and potential techno-economic advantages of employing microwaves for direct air capture (DAC) applications. The experimental setup resembles an industrial-scale microwave system, utilizing a single-mode applicator zeolite 13x beads arranged in panel configuration. configuration essentially represents miniaturized version DAC plant based on microwaves. results demonstrate that irradiation rapidly efficiently desorbs CO 2 from sorbents with...

Abstract Past studies on CO 2 utilization in the concrete industry have primarily focused maximizing sequestered , while focusing less avoidance possible by reducing binder use through addition of to formulations. In this paper, we study net reduction and cost benefits achievable loading adding via three approaches: carbonation during curing, mixing, or with recycled aggregate. These techniques are evaluated for a cohort formulations representing diverse mixture designs found US ready-mixed...

Independent of the modal identification techniques employed for damage detection, use measured data limits expectations location. These limitations are examined using distribution strain energy and sensitivity frequency mode shapes to structural stiffness changes. For given information specific accuracy, this examination reveals following: (1) detection is feasible members that contribute significantly modes, (2) modes which most effective in detecting certain critical can be identified, (3)...

Structural damage detection in a twenty-bay planar truss was accomplished using an artificial neural network. Instead of natural frequencies and mode shapes, the frequency response functions (FRF's) experimentally obtained from accelerometers at two locations on were directly used to distinguish among cases train Unlike conventional approaches based system identification techniques, network approach does not require analytical model structure. The direct use FRF's eliminates need for modal...

Abstract This paper examines the scale and costs of using direct air capture (DAC) with CO 2 storage to reduce net emissions from US electric sector by 70% in 2050 relative 2010. Least-cost emission technology trajectories are generated an optimization-based stock-and-flow model electricity generation meet target. The analysis finds that 30%–44% reduction projected under a least cost business-as-usual (BAU) scenario dominated natural gas would fall well short target at 2050. Delaying...

A systematic procedure of placing accelerometers for the on-orbit modal identification large flexible space structures is addressed. Target modes testing are selected by examining cost each mode. Assuming that a time-domain algorithm such as Eigensystem Realization Algorithm employed to identify from measured time response data, sensors placed ensure recovery target modes. As an application example procedure, accelerometer placement study Space Station Freedom On-Orbit Modal Identification...

The sun tracking control system design of the Solar Alpha Rotary Joint (SARJ) and interaction with flexible structure Space Station Freedom (SSF) evolutionary concepts are addressed. significant components space station pertaining to SARJ described is presented. Finite element models representing two concepts, enhanced operations capability (EOC) extended (XOC), employed evaluate influence low frequency on performance. variables synthesized using a constrained optimization technique meet...

An adaptive Ž lter or a neural network concept has been used to develop an algorithmfor real-time system identiŽ cation and control. The algorithmpermits not only of transfer functions linear structural systems but also extraction modal parameters such as natural frequencies, damping ratios, mode shape coefŽ cients in real time. Because the algorithm is capable identifying single at time, bandpass lters are employed make it work properly for with multiplemodes. algorithmhas implemented...

Finding means of storing and transporting captured carbon dioxide (CO2) has become increasingly important. Not all capture technologies (sources) can be co-located with sequestration options (sinks), the development an expansive CO2 pipeline network to connect sources sinks requires significant time capital. Additionally, temporary storage in a solid or liquid state could prove useful for allowing today’s come online before permanent ideally lucrative open up. There are several methods...

The photovoltaic array sun tracking control system of Space Station Freedom is described. A synthesis procedure for determining optimized values the design variables developed using a constrained optimization technique. performed to provide given level stability margin, achieve most responsive performance, and meet other requirements. Performance baseline design, which synthesized predicted structural characteristics, discussed sensitivity margin examined variations frequencies, mode shapes...

This paper presents a detailed description of solar radiation torque modeling for the Full-Sky Astrometric Mapping Explorer (FAME). During science data collection, spinning FAME spacecraft employs generated by its sun shield to precess vehicle spin axis about sun-spacecraft line. The consists surfaces with various geometric shapes and optical properties. A procedure is developed accommodate potential shape errors surface property variations assess their impacts on precession performance....

Using adaptive filtering techniques, on-line system identification algorithms have been investigated to identify simultaneously modal parameters of multiple modes for flexible structures. The existing filter based, parameter algorithm is designed a single mode at time. Thus, the must be supplemented by band-pass extract from measurement signal frequency contents in vicinity desired mode. This approach not effective structures with high density. presented herein are explored mainly overcome...