| 1. |
- Luo, Ziyu, et al.
(författare)
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An Efficient Deep-Subwavelength Second Harmonic Nanoantenna Based on Surface Plasmon-Coupled Dilute Nitride GaNP Nanowires
- 2021
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Ingår i: Nano Letters. - : AMER CHEMICAL SOC. - 1530-6984 .- 1530-6992. ; 21:8, s. 3426-3434
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Tidskriftsartikel (refereegranskat)abstract
- High-index semiconductor nanoantennae represent a powerful platform for nonlinear photon generation. Devices with reduced footprints are pivotal for higher integration capacity and energy efficiency in photonic integrated circuitry (PIC). Here, we report on a deep subwavelength nonlinear antenna based on dilute nitride GaNP nanowires (NWs), whose second harmonic generation (SHG) shows a 5-fold increase by incorporating similar to 0.45% of nitrogen (N), in comparison with GaP counterpart. Further integrating with a gold (Au) thin film-based hybrid cavity achieves a significantly boosted SHG output by a factor of similar to 380, with a nonlinear conversion efficiency up to 9.4 x 10(-6) W-1. In addition, high-density zinc blende (ZB) twin phases were found to tailor the nonlinear radiation profile via dipolar interference, resulting in a highly symmetric polarimetric pattern well-suited for coupling with polarization nano-optics. Our results manifest dilute nitride nanoantenna as promising building blocks for future chip-based nonlinear photonic technology.
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| 2. |
- Stephan, Ute, et al.
(författare)
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Agility or Wait-and-See? : How the Covid-19 Crisis Impacts Entrepreneurs’ Well-being across Countries
- 2021
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Ingår i: Academy of management annual meeting proceedings. - Briarcliff Manor, NY, USA : Academy of Management.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We study how entrepreneurs and their well-being are impacted by crises and which entrepreneurs are able to safeguard their well-being. We examine the impact of the Covid-19 pandemic in a multilevel study of 3,149 entrepreneurs from 20 countries and draw attention to entrepreneur agility (flexible and adaptive action) both as a crisis response strategy and as a possible way for entrepreneurs to protect their well-being. We find that agile entrepreneurs, especially those that recognized new opportunities for their business in the pandemic, had better well-being during the pandemic (life satisfaction and vitality). Our findings offer further insights into agility as a response to adversity and whether it is enabled by cultural contexts supporting agility and entrepreneurs? human capital.
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| 3. |
- Wang, Tao, et al.
(författare)
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The adverse impact of electric vehicles on traffic congestion in the morning commute
- 2021
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Ingår i: Transportation Research, Part C: Emerging Technologies. - : Elsevier BV. - 0968-090X. ; 125
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Tidskriftsartikel (refereegranskat)abstract
- Many governments around the world are striving to promote the development of EVs for EV's sustainability and efficiency. However, EVs may induce extra traffic congestion in the morning commute. To illustrate this point, we incorporate the vehicle's energy consumption (EC) into the classical morning commute model to explore the EV's influence on the morning commute. First, we study the impact of the vehicle's EC on the waiting time in the user equilibrium (UE) state. Second, the properties of commuter's waiting time in the traffic system with EVs and gasoline vehicles (GVs) are analyzed. Finally, two interventions are proposed to alleviate the extra traffic congestion caused by EVs. The analytical and numerical results of this study reveal that i) EVs will induce extra traffic congestion, and ii) we can apply some interventions to alleviate the side effect of EVs and reap more benefits from EVs. The conclusions indicate that some interventions should be conducted when EVs enter the traffic system, which sheds light on the policymaking for the promotion of EVs.
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| 4. |
- Zhou, Hui-Ling, et al.
(författare)
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Optimal timing for carbon capture retrofitting in biomass-coal combined heat and power plants in China
- 2021
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Ingår i: Journal of Cleaner Production. - : ELSEVIER SCI LTD. - 0959-6526 .- 1879-1786. ; 293
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Tidskriftsartikel (refereegranskat)abstract
- Industrial decision-makers may wonder about the optimal timing for investing in carbon capture retrofitting in co-firing power plants, faced with uncertain benefits from upcoming China's carbon trading market and potential cost reductions derived from technology innovation. The decision on investment timing relates to the so-called waiting value, considering multiple uncertainties and trade-offs. This article applies a real options-based framework, adapted to deal with the waiting value in the context of multiple uncertainties of carbon market, technical improvements and biomass availability. The problem is solved through an efficient simulation method. The results suggest that the optimal retrofit timing for CCS (carbon capture and storage) in a co-firing CHP will be the year 2033 considering a basic scenario, in which the carbon price is 98 CNY/tonCO(2) (14.5 USS/tonCO(2)) in 2025, the growth rate and volatility are 5% and 7% respectively, and technical improvements are expected every six years and result in a cost reduction of 50%. In addition, we examine the effects of different sub-dimensions in the carbon market and technical improvement on anticipating the retrofit timing. The conclusions of this article provide decision-makers with strategies of adjusting the investment timing in response to their different expectations of market and technology developments. Further practical applications require judgments of future trends made by decision-makers and extensive data of specific cases.
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