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Arran Curran,Russell J. Barbour,Jessica K. Morrod,Kevin A. Prior,Ajoy K. Kar,Richard J. Warburton 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We report the observation of strong and weak exciton-photon coupling in a variety of ZnSe-based microcavities fabricated using epitaxial liftoff. Molecular-beam-epitaxy grown ZnSe/Zn0.9Cd0.1Se quantum wells with a one-wavelength optical length at the exciton emission were transferred to a SiO2/Ta2O5 mirror with a reflectance of 96 %. Three experiments are presented, evidencing strong exciton-photon coupling in both a fixed and tunable microcavity and lasing at room temperature in a monolithic device. We report the observation of strong and weak exciton-photon coupling in a variety of ZnSe-based microcavities fabricated using epitaxial liftoff. Molecular-beam-epitaxy grown ZnSe/Zn0.9Cd0.1Se quantum wells with a one-wavelength optical length at the exciton emission were transferred to a SiO2/Ta2O5 mirror with a reflectance of 96 %. Three experiments are presented, evidencing strong exciton-photon coupling in both a fixed and tunable microcavity and lasing at room temperature in a monolithic device.
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Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Plants: AMPGas
Gibson, J. A. Arran,Mangano, Enzo,Shiko, Elenica,Greenaway, Alex G.,Gromov, Andrei V.,Lozinska, Magdalena M.,Friedrich, Daniel,Campbell, Eleanor E. B.,Wright, Paul A.,Brandani, Stefano American Chemical Society 2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.55 No.13
<P>The key challenge in postcombustion capture from gas-fired power plants is related to the low CO2 concentration in the flue gas (4-8% by volume). This means that conventional amine processes will result in a relatively high energy penalty, whereas novel adsorbents and adsorption processes have the potential to improve the efficiency of separation. High-selectivity adsorbents are required to achieve relatively high CO2 uptake at low partial pressures, which means that the separation process should be based on either very strong physisorption or chemisorption with thermal regeneration. From the process point of view, the main challenge is to develop efficient separation processes with rapid thermal cycles. In this report we present a detailed overview of the methodology behind the development of novel materials and processes as part of the 'Adsorption Materials and Processes for Gas-fired power plants' (AMPGas) project. Examples from a wide variety of materials tested are presented, and the design of an innovative bench-scale 12-column rotary wheel adsorber system is discussed. The strategy to design, characterize, and test novel materials (zeolites, amine-containing MOFs, amine-based silicas, amine-based activated carbons, and carbon nanotubes), specifically designed for CO2 capture from dilute streams is presented.</P>
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문제해결 추구 교육 : 학생들은 왜, 무엇을, 어떻게 배울 것인가?
이태동 ( Lee Tae Dong ),( Hurley Arran ) 경희대학교 사회과학연구원 2020 社會科學硏究 Vol.46 No.2
학생들은 문제해결 추구 교육 (Solution seeking learning: SSL)에 대해서 왜, 무엇을, 어떻게 배울 수 있을까? 기존의 문제, 프로젝트, 질문 중심 등 실험적 교육 방법은 주로 문제 제기와 인과 관계에 초점을 맞춰 왔다. 새롭게 고안된 문제해결 추구 교육 은 현실문제에 대한 해결 방안을 협력을 통해 모색하고 제시하는 것을 목적으로 한다. 문제해결 추구 교육은 문제의 배경, 이해 관계자를 고려하여 해결 방안을 제시하고, 이를 실현가능성, 효과성, 효율성을 바탕으로 평가하게 한다. 학생들을 교수자와 동료 학생들과의 상호작용 과정에서 지역과 지구적 문제에 대한 손에 잡히는 문제 해결 방안을 찾고 발전시키며, 나누게 된다. 이 연구는 문제해결 추구 교육이 학부와 대학원 환경-에너지 정치 수업에서 어떻게 적용될 수 있는가 사례를 보여준다. 경험적인 연구는 문제해결 추구 교육이 학생들의 문제 정의, 해결 방안 모색뿐만 아니라 협동하여 발표하고 상호작용하는 능력에도 긍정적인 영향이 있음을 밝히고 있다. Why, what, and how do students learn about solution seeking and provision? Existing experiential teaching methods including problem-, project-, and inquiry-based learning focus primarily on problem identification and on discovering causal relationships. The primary aim of our newly developed solution-seeking learning (SSL) is to collaboratively explore and propose solutions to real-world problems. SSL considers the broader contexts in which problems are situated, the interests of relevant stakeholders, and the assessment of proposed solutions based on their feasibility, effectiveness, and efficiency. Through a process of presentation to, and feedback from, instructors and peers, students seek, develop, and share tangible solutions to local and global issues. This study presents how SSL was applied in undergraduate and graduate courses on environmental and energy politics in higher education. The empirical evidence suggests that SSL not only enhances students’ solution-seeking and problem identification capabilities, but also develops essential skills in collaboration, presentation, and feedback.
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MBE Growth and Characterization of MgS-Rich Zinc-Blende ZnxMg1−xS1−ySey Alloys
Richard T. Moug,Christine Bradford,Damien Thuau,Arran Curran,Richard J. Warburton,Kevin A. Prior 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Samples containing ZnMgSSe alloy were grown by using molecular beam epitaxy at 240 ℃ and were analyzed by using X-ray interference. The alloy composition was found to be Zn0.20Mg0.80S0.64Se0.36. The surfaces of these layers were found to be extremely flat, unlike MgS layers of similar thickness grown under identical conditions, which show pronounced ridges. Structures with Zn0.20Mg0.80S0.64Se0.36 barriers were grown with ZnSe quantum wells and showed good quantum confinement with a sharp PL peak. Calculations of the phase stability of ZnMgSSe alloys suggest that an alloy of this composition should phase separate. However, samples with this composition are demonstrably single phase, and the discrepancy with the calculation can be removed if the enthalpy of formation of zinc-blende MgS is reduced by less than 2 % to −231 kJ mol−1.
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