Effect of the metal matrix on the probability of the low-energy transition in 234Pa nuclei

AbstractWe report on the metal-organic chemical vapor deposition (MOCVD) of strained layer superlattices (SLSs) of InAsSb/InAs/InPSb/InAs as well as mid-infrared optically pumped lasers grown using a high speed rotating disk reactor (RDR). The devices contain AlAsSb cladding layers and strained, type I, InAsSb/InAs/InPSb/InAs strained layer superlattice (SLS) active regions. By changing the layer thickness and composition of the SLS, we have prepared structures with low temperature (<20K) photoluminescence wavelengths ranging from 3.4 to 4.8 µm. The optical properties of the InAsSb/InPSb superlattices revealed an anomalous low energy transition that can be assigned to an antimony-rich, interfacial layer in the superlattice. This low energy transition can be eliminated by introducing a 1.Onm InAs layer between the InAsSb and InPSb layers in the superlattice. An InAsSb/InAs/InPSb/InAs SLS laser was grown on an InAs substrate with AlAs0.16Sb0.844cladding layers. A lasing threshold and spectrally narrowed laser emission were seen from 80 through 250 K, the maximum temperature where lasing occurred. The temperature dependence of the SLS laser threshold is described by a characteristic temperature, T0 = 39 K, from 80 to 200 K.

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Energy Efficiency Standards of Single-Family Houses: Factors in Homeowners’ Decision-Making in Two Austrian Regions

Energy and Environment Research ◽

10.5539/eer.v5n2p49 ◽

2015 ◽

Vol 5 (2) ◽

pp. 49 ◽

Cited By ~ 1

Author(s):

Katja Bedenik ◽

Ralph Hansmann ◽

Monika Popp ◽

Anne Von Streit ◽

Claudia R. Binder

Keyword(s):

Energy Efficiency ◽

Residential Buildings ◽

Energy Transition ◽

Low Energy ◽

Building Energy Efficiency ◽

Single Family ◽

Building Projects ◽

Federal States ◽

Energy Efficiency Standard ◽

Energy Efficiency Standards

The energy efficiency of residential buildings is a central issue in the widely discussed energy transition. This study investigates which factors influence homeowners´ decisions regarding the energy efficiency standard of their houses. Homeowners who built or renovated their houses between 2008 and 2013 participated in a questionnaire survey in two Austrian “energy regions” within the federal states of Styria and Burgenland. In the majority (66%) of cases, homeowners chose the low-energy house standard B (≤ 50kWh/m2a) for their building or renovation projects, followed by the conventional standard C (≤ 100kWh/m2a) (21%). Only 13% realized ultra-low-energy, passive or plus-energy houses with a higher energy efficiency standard (A (≤ 25kWh/m2a), A+ (≤ 15kWh/m2a), or A++ (≤ 10kWh/m2a)). Expert recommendations on energy standards showed the highest correlation with the selected standards, and on average, new building projects realized better energy efficiency standards than did renovations. Further variables that were significantly related to the realized standards included homeowners’ attitudes and knowledge about building energy efficiency standards and the age of the respondents. Although the homeowners who were surveyed were initially satisfied with the selected energy efficiency standard, many now indicate a preference to implement significantly higher energy efficiency standards than those achieved in their project. Further, they would recommend even significantly higher energy efficiency standards to friends than the standards preferred for their own house. These findings suggest that current preferences and communication in social networks promote higher future energy efficiency standards.

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Implantation of high-energy Si and Be ions in InP and low-energy transition metal ions in InGaAs

[Proceedings 1991] Third International Conference Indium Phosphide and Related Materials ◽

10.1109/iciprm.1991.147348 ◽

2002 ◽

Author(s):

M.V. Rao ◽

R.K. Nadella ◽

S.M. Gulwadi

Keyword(s):

Transition Metal ◽

Metal Ions ◽

Energy Transition ◽

Transition Metal Ions ◽

High Energy ◽

Low Energy

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Low Energy Transition Curve

International Conference on Software Technology and Engineering, 3rd (ICSTE 2011) ◽

10.1115/1.859797.paper59 ◽

2011 ◽

pp. 395-399

Keyword(s):

Energy Transition ◽

Low Energy ◽

Transition Curve

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COVID-19 impacts on energy demand can help reduce long-term mitigation challenge

10.21203/rs.3.rs-155224/v1 ◽

2021 ◽

Author(s):

Jarmo Kikstra ◽

Adriano Vinca ◽

Francesco Lovat ◽

Benigna Boza-Kiss ◽

Bastiaan van Ruijven ◽

...

Keyword(s):

Energy Demand ◽

Energy Use ◽

Ghg Emissions ◽

Energy Transition ◽

Low Energy ◽

Climate Mitigation ◽

Economic Downturn ◽

Demand Side ◽

Final Energy ◽

Final Energy Demand

Abstract The COVID-19 pandemic caused radical temporary breaks with past energy use trends. However, how a post-pandemic recovery will impact the longer-term energy transition is unclear. Here, we present a set of global COVID-19 shock-and-recovery scenarios that systematically explore the demand-side effect on final energy and GHG emissions. Our pathways project final energy demand reductions of 12 to 40 EJ/yr by 2025 and cumulative CO2 emissions reductions by 2030 of 28 to 53 GtCO2, depending on the depth and duration of the economic downturn and demand-side changes. Recovering from the pandemic with low energy demand practices - embedded in new patterns of travel, work, consumption, and production – reduces climate mitigation challenges. A low energy demand recovery reduces carbon prices for a 1.5°C consistent pathway by 19%, lowers energy supply investments until 2030 by 2.1 trillion USD, and lessens pressure on the upscaling of renewable energy technologies.

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Molecular Electrochemical Reductive Splitting of Dinitrogen with a Molybdenum Complex

10.33774/chemrxiv-2021-dwvbg ◽

2021 ◽

Author(s):

Lydia Merakeb ◽

Soukaina Bennaamane ◽

Eric Clot ◽

Nicolas Mézailles ◽

Marc Robert

Keyword(s):

Nitrogen Fixation ◽

Transition State ◽

Atmospheric Pressure ◽

Room Temperature ◽

Energy Transition ◽

Low Energy ◽

Short List ◽

Molybdenum Complex ◽

Nmr Studies ◽

Mild Conditions

Nitrogen reduction in mild conditions (i.e. room temperature and atmospheric pressure) and using a non-fossil source of hydrogen remains a high chemistry challenge. Molecular metal complexes, notably Mo based, have recently shown to be active for such nitrogen fixation. In this work, we report about the electrochemical N2 splitting with MoIII triphosphino com-plex ((PPP)MoI3), at room temperature and a moderately negative potential. A MoIV nitride species was generated, which was confirmed by electrochemistry and NMR studies. The reaction goes through the bi-electronic reduction of the starting Mo species, coordination of an N2 molecule, and further splitting to a MoIV nitride complex. Preliminary DFT investigation supports the intermediacy of a bridging MoIN2MoI dinitrogen dimer evolving to the Mo nitride via a low energy transition state. This example joins a short list of molecular electrochemical complexes for N2 reductive cleavage. It opens a door to molecular electrochemical PCET conversion studies of N2 to NH3.

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