| Records |
| Author |
Arulraj, A.; Murugesan, P.K.; Rajkumar, C.; Zamorano, A.T.; Mangalaraja, R.V. |
| Title |
Nanoarchitectonics of Layered Metal Chalcogenides-Based Ternary Electrocatalyst for Water Splitting |
Type |
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| Year |
2023 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
16 |
Issue |
4 |
Pages |
1669 |
| Keywords |
chalcogenides; nanoarchitectonics; electrocatalyts; water splitting; future perspectives |
| Abstract |
The research on renewable energy is actively looking into electrocatalysts based on transition metal chalcogenides because nanostructured electrocatalysts support the higher intrinsic activity for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). A major technique for facilitating the conversion of renewable and sustainable energy is electrochemical water splitting. The aim of the review is to discuss the revelations made when trying to alter the internal and external nanoarchitectures of chalcogenides-based electrocatalysts to enhance their performance. To begin, a general explanation of the water-splitting reaction is given to clarify the key factors in determining the catalytic performance of nanostructured chalcogenides-based electrocatalysts. To delve into the many ways being employed to improve the HER's electrocatalytic performance, the general fabrication processes utilized to generate the chalcogenides-based materials are described. Similarly, to enhance the OER performance of chalcogenides-based electrocatalysts, the applied complementary techniques and the strategies involved in designing the bifunctional water-splitting electrocatalysts (HER and OER) are explained. As a conclusive remark, the challenges and future perspectives of chalcogenide-based electrocatalysts in the context of water splitting are summarized. |
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| ISSN |
1996-1073 |
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Conference |
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| Notes |
WOS:000939023900001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1741 |
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| Author |
Babonneau, F.; Barrera, J.; Toledo, J. |
| Title |
Decarbonizing the Chilean Electric Power System: A Prospective Analysis of Alternative Carbon Emissions Policies |
Type |
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| Year |
2021 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
14 |
Issue |
16 |
Pages |
4768 |
| Keywords |
ETEM model; 100% renewable; net zero emission; carbon tax; carbon capture and storage |
| Abstract |
In this paper, we investigate potential pathways for achieving deep reductions in CO2 emissions by 2050 in the Chilean electric power system. We simulate the evolution of the power system using a long-term planning model for policy analysis that identifies investments and operation strategies to meet demand and CO2 emissions reductions at the lowest possible cost. The model considers a simplified representation of the main transmission network and representative days to simulate operations considering the variability of demand and renewable resources at different geographical locations. We perform a scenario analysis assuming different ambitious renewable energy and emission reduction targets by 2050. As observed in other studies, we show that the incremental cost of reducing CO2 emissions without carbon capture or offset alternatives increases significantly as the system approaches zero emissions. Indeed, the carbon tax is multiplied by a factor of 4 to eliminate the last Mt of CO2 emissions, i.e., from 2000 to almost 8500 USD/tCO(2) in 2050. This result highlights the importance of implementing technology-neutral mechanisms that help investors identify the most cost-efficient actions to reduce CO2 emissions. Our analysis shows that Carbon Capture and Storage could permit to divide by more than two the total system cost of a 100% renewable scenario. Furthermore, it also illustrates the importance of implementing economy-wide carbon emissions policies that ensure that the incremental costs to reduce CO2 emissions are roughly similar across different sectors of the economy. |
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Edition |
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| ISSN |
1996-1073 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000689092700001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1450 |
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| Author |
Caceres, G.; Fullenkamp, K.; Montane, M.; Naplocha, K.; Dmitruk, A. |
| Title |
Encapsulated Nitrates Phase Change Material Selection for Use as Thermal Storage and Heat Transfer Materials at High Temperature in Concentrated Solar Power Plants |
Type |
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| Year |
2017 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
10 |
Issue |
9 |
Pages |
21 pp |
| Keywords |
EPCM; nitrates; thermal energy storage (TES); heat transfer materials; CSP |
| Abstract |
In the present paper, the finite element method is used to perform an exhaustive analysis of the thermal behavior of encapsulated phase change materials (EPCMs), which includes an assessment of several materials in order to identify the best combination of PCM and shell material in terms of thermal energy storage, heat transfer rate, cost of materials, limit of pressure that they can support and other criteria. It is possible to enhance the heat transfer rate without a considerable decrease of the thermal energy storage density, by increasing the thickness of the shell. In the first examination of thermomechanical coupling effects, the technical feasibility can be determined if the EPCM dimensions are designed considering the thermal expansion and the tensile strength limit of the materials. Moreover, when a proper EPCM shell material and PCM composition is used, and compared with the current storage methods of concentrated solar power (CSP) plants, the use of EPCM allows one to enhance significantly the thermal storage, reaching more than 1.25 GJ/m(3) of energy density. |
| Address |
[Caceres, Gustavo; Fullenkamp, Karina; Montane, Macarena] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Ave Diagonal Las Torres 2640, Santiago 7941169, Chile, Email: gustavo.caceres@uai.cl; |
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| Publisher |
Mdpi Ag |
Place of Publication |
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| Language |
English |
Summary Language |
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Edition |
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| ISSN |
1996-1073 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000411225200074 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
805 |
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| Author |
Moffat, R.; Caceres, C.; Tapia, E |
| Title |
Rock Pillar Design Using a Masonry Equivalent Numerical Model |
Type |
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| Year |
2021 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
14 |
Issue |
4 |
Pages |
890 |
| Keywords |
rock pillar; design numerical model; mining; underground stability |
| Abstract |
In underground mining, the design of rock pillars is of crucial importance as these are structures that allow safe mining by maintaining the stability of the surrounding excavations. Pillar design is often a complex task, as it involves estimating the loads at depths and the strength of the rock mass fabric, which depend on the intact strength of the rock and the shape of the pillar in terms of the aspect ratio (width/height). The design also depends on the number, persistence, orientation, and strength of the discontinuities with respect to the orientation and magnitude of the stresses present. Solutions to this engineering problem are based on one or more of the following approaches: empirical design methods, practical experience, and/or numerical modeling. Based on the similarities between masonry structures and rock mass characteristics, an equivalent approach is proposed as the one commonly used in masonry but applied to rock pillar design. Numerical models using different geometric configurations and state of stresses are carried out using a finite difference numerical approach with an adapted masonry model applied to rocks. The results show the capability of the numerical approach to replicate common types of pillar failure modes and stability thresholds as those observed in practice. |
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Edition |
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| ISSN |
1996-1073 |
ISBN |
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Medium |
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| Area |
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Conference |
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| Notes |
WOS:000623469900001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1350 |
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| Author |
Nasirov, S.; Cruz, E.; Agostini, C.A.; Silva, C. |
| Title |
Policy Makers' Perspectives on the Expansion of Renewable Energy Sources in Chile's Electricity Auctions |
Type |
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| Year |
2019 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
12 |
Issue |
21 |
Pages |
17 pp |
| Keywords |
renewable energy; auctions; regulator's perspective; Chile |
| Abstract |
Chile has become one of the first few countries where renewable sources compete directly with conventional generation in price-based auctions. Moreover, the results of energy auctions during the last few years show a remarkable transition from conventional fossil fuels to renewable energies. In fact, the energy auction in 2017, to provide energy to customers from distribution companies, achieved a massive expansion in renewable technology at one of the lowest prices in the world. These positive results prompted the question if such results were permanent or temporal due to factors with limited effects. In this regard, this paper studies the key factors that drove the significant rise of renewable technologies in Chilean energy auctions, obtaining valuable lessons for regulators, not only in Chile, but also in the region and the world. For this purpose, we considered a well-proven method based on a hybrid multicriteria decision-making model to examine and prioritize the main drivers of the expansion of renewables in auctions. The results showed that some specific characteristics of the auction design, particularly the hourly supply blocks, the lead time for project construction, and contract duration, were the most significant drivers for the expansion of renewables in energy auctions. Moreover, the results showed that, provided that the auction design accommodates for such drivers, solar energy ends up as the most attractive technology in the Chilean auctions. The research also shows the main findings are robust by the application of a probabilistic sensitivity analysis. |
| Address |
[Nasirov, Shahriyar; Cruz, Eugenio; Silva, Carlos] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Ave Diagonal Las Torres 2640, Santiago 7941169, Chile, Email: shahriyar.nasirov@uai.cl; |
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Mdpi |
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English |
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Edition |
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| ISSN |
1996-1073 |
ISBN |
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Expedition |
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Conference |
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| Notes |
WOS:000512340000128 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
1103 |
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| Author |
Nasirov, S.; Silva, C.; Agostini, C.A. |
| Title |
Investors' Perspectives on Barriers to the Deployment of Renewable Energy Sources in Chile |
Type |
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| Year |
2015 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
8 |
Issue |
5 |
Pages |
3794-3814 |
| Keywords |
renewables; energy; investors; Chile; barriers |
| Abstract |
In the last decade, the importance of exploiting Chile's Renewable Energy Sources (RESs) has increased significantly, as fossil fuel prices have risen and concerns regarding climate change issues grown, posing an important threat to its economy. However, to date, the advancement of Renewable Energy Technologies (RETs) in the country has been very limited due to various barriers. For this reason, identifying and mitigating the main barriers that hamper the advancement of RETs is necessary to allow the successful deployment of these technologies. Based on data collected from a questionnaire survey and interviews conducted among the major renewable project developers, the authors identify and rank the major barriers to the adoption of renewable energy technologies in Chile. Our findings show that the most significant barriers include grid connection constraints and lack of grid capacity, longer processing times for a large number of permits, land and/or water lease securement and limited access to financing. Furthermore, we discuss the most critical barriers in detail together with policy recommendations to overcome them. |
| Address |
[Nasirov, Shahriyar; Silva, Carlos] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 7941169, Chile, Email: shahriyar.nasirov@uai.cl; |
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| Publisher |
Mdpi Ag |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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| ISSN |
1996-1073 |
ISBN |
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Conference |
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| Notes |
WOS:000356879600026 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
512 |
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| Author |
Veliz-Tejo, A.; Travieso-Torres, J.C.; Peters, A.A.; Mora, A.; Leiva-Silva, F. |
| Title |
Normalized-Model Reference System for Parameter Estimation of Induction Motors |
Type |
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| Year |
2022 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
15 |
Issue |
13 |
Pages |
4542 |
| Keywords |
parameter estimation; adaptive systems; induction motors; nonlinear dynamical systems; persistent excitation |
| Abstract |
This manuscript proposes a short tuning march algorithm to estimate induction motors (IM) electrical and mechanical parameters. It has two main novel proposals. First, it starts by presenting a normalized-model reference adaptive system (N-MRAS) that extends a recently proposed normalized model reference adaptive controller for parameter estimation of higher-order nonlinear systems, adding filtering. Second, it proposes persistent exciting (PE) rules for the input amplitude. This N-MRAS normalizes the information vector and identification adaptive law gains for a more straightforward tuning method, avoiding trial and error. Later, two N-MRAS designs consider estimating IM electrical and mechanical parameters. Finally, the proposed algorithm considers starting with a V/f speed control strategy, applying a persistently exciting voltage and frequency, and applying the two designed N-MRAS. Test bench experiments validate the efficacy of the proposed algorithm for a 10 HP IM. |
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1996-1073 |
ISBN |
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| Notes |
WOS:000825676800001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1616 |
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| Author |
Werlinger, F.; Segura, C.; Martinez, J.; Osorio-Roman, I.; Jara, D.; Yoon, S.J.; Gualdron-Reyes, A.F. |
| Title |
Current Progress of Efficient Active Layers for Organic, Chalcogenide and Perovskite-Based Solar Cells: A Perspective |
Type |
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| Year |
2023 |
Publication |
Energies |
Abbreviated Journal |
Energies |
| Volume |
16 |
Issue |
16 |
Pages |
5868 |
| Keywords |
light harvest; ingorganic molecules; metal chalcogenides; metal halide perovskites; active layer |
| Abstract |
Photovoltaics has become one of the emerging alternatives to progressively supply/replace conventional energy sources, considering the potential exploitation of solar energy. Depending on the nature of the light harvester to influence on its light-absorption capability and the facility to produce electricity, different generations of solar devices have been fabricated. Early studies of organic molecules (dye sensitizers) with good absorption coefficients, going through metal chalcogenides and, lastly, the timely emergence of halide perovskites, have promoted the development of novel and low-cost solar cells with promising photoconversion efficiency (PCE), close to the well-established Si-based devices. However, main drawbacks such as the degradation/photocorrosion of the active layer, the existence of intrinsic defect sites, and the inherent toxicity of the material due to the presence of some harmful elements have blocked the future commercialization of the above kind of solar cells. In this review, we highlight the current progress in achieving efficient photomaterials for organic, chalcogenides and halide perovskites-based solar cells with the purpose of achieving high PCE values, some of which are breakthroughs in this research topic, and the diverse approaches used to extend the stability of the active layer and improve the performance of the solar devices. |
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Edition |
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| ISSN |
1996-1073 |
ISBN |
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Conference |
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| Notes |
WOS:001057161000001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1884 |
| Permanent link to this record |
