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Crisp, Ryan W.,Pach, Gregory F.,Kurley, J. Matthew,France, Ryan M.,Reese, Matthew O.,Nanayakkara, Sanjini U.,MacLeod, Bradley A.,Talapin, Dmitri V.,Beard, Matthew C.,Luther, Joseph M. American Chemical Society 2017 Nano letters Vol.17 No.2
<P>We developed a monolithic CdTe–PbS tandem solar cell architecture in which both the CdTe and PbS absorber layers are solution-processed from nanocrystal inks. Due to their tunable nature, PbS quantum dots (QDs), with a controllable band gap between 0.4 and ∼1.6 eV, are a promising candidate for a bottom absorber layer in tandem photovoltaics. In the detailed balance limit, the ideal configuration of a CdTe (<I>E</I><SUB>g</SUB> = 1.5 eV)–PbS tandem structure assumes infinite thickness of the absorber layers and requires the PbS band gap to be 0.75 eV to theoretically achieve a power conversion efficiency (PCE) of 45%. However, modeling shows that by allowing the thickness of the CdTe layer to vary, a tandem with efficiency over 40% is achievable using bottom cell band gaps ranging from 0.68 and 1.16 eV. In a first step toward developing this technology, we explore CdTe–PbS tandem devices by developing a ZnTe–ZnO tunnel junction, which appropriately combines the two subcells in series. We examine the basic characteristics of the solar cells as a function of layer thickness and bottom-cell band gap and demonstrate open-circuit voltages in excess of 1.1 V with matched short circuit current density of 10 mA/cm<SUP>2</SUP> in prototype devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2017/nalefd.2017.17.issue-2/acs.nanolett.6b04423/production/images/medium/nl-2016-04423k_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl6b04423'>ACS Electronic Supporting Info</A></P>
Ryan Urban,Justin Wong,Peter Lim,Susan Zhang,Ingrid Spadinger,Robert Olson,Francois Bachand,Clement Ho,Anna V. Tinker,Lovedeep Gondara,Sarah Nicole Hamilton 대한부인종양학회 2022 Journal of Gynecologic Oncology Vol.33 No.5
Objective: To evaluate gastrointestinal (GI) patient reported outcomes (PROs) in cervical cancer patients treated with definitive radiotherapy (RT), comparing 3D conformal RT (3DCRT) vs. intensity modulated/volumetric modulated arc therapy (IMRT/VMAT). Methods: An analysis of patients treated with definitive RT between 2015–2018 was performed. GI PROs were prospectively collected at baseline, during RT (acute), ≤12 weeks after RT (subacute), and >12 weeks after RT (late). GI PROs evaluated three symptom domains: bowel problems (BPs), bowel bother (BB), and abdominal problems (APs). Multiple linear regression analysis was performed to investigate associations between mean changes of symptom scores with clinical and dosimetric variables. Results: The cohort included 167 patients. A total of 100 (60%) patients were treated with IMRT/VMAT and 67 (40%) with 3DCRT. In the subacute phase, the mean change of symptom scores from baseline in 3DCRT vs. IMRT/VMAT were +0.9 vs. −1.15 (p=0.004) for BP, +2.18 vs. −0.10 (p=0.019) for BB, and +1.41 vs. −0.38 (p=0.021) for AP. Likewise, in the late phase, mean changes were +0.72 vs. −0.82 (p=0.014) for BP, +1.98 vs. −0.03 (p=0.008) for BB, and +1.29 vs. −0.31 (p<0.001) for AP. On multiple linear regression, use of 3DCRT vs. IMRT/VMAT was associated with greater mean changes in subacute BP (p=0.023) and late phase AP (p=0.019). A higher small bowel V50Gy was associated increased symptom scores in late AP (p=0.012). Conclusion: 3DCRT was associated with significantly greater worsening of GI PRO symptom scores in the subacute and late phase. These data support the ongoing use of IMRT/VMAT in routine practice
Business and Local Taxation in the Philippines
Ryan Tans 동아시아연구원 2020 Journal of East Asian Studies Vol.20 No.3
This article argues that weak local governments increase levels of taxation by “borrowing” institutional capacity from certain types of businesses. While many businesses lobby against taxation, businesses that are locally owned, nationally connected, and logistically complex build robust associations that support taxation. These types of businesses benefit from improvements in public infrastructure, so they empower their associations to monitor members’ tax compliance and to pressure officials to uphold their spending commitments. The article demonstrates the necessity of business support for taxation in the absence of state capacity by comparing two Philippine cities that differ in their ability to tax despite a number of similarities between them. The case studies show that tax increases co-varied with business support, and that business support waxed and waned depending on over-time variation in the capability of business associations to discourage tax evasion and to enforce official commitments to spend on infrastructure.
Ryan Febriansyah,Soo Young Shin,Simon Siregar 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
Autonomous Underwater Vehicle (AUV) is being widely researched in order to achieve superior performance when working in hazardous environments. This paper focuses on Implementation of Visual Processing for Autonomous Underwater Vehicle (AUV) on Robot Operating System (ROS) using Hough Transform. AUV on sensor for navigation, localization, and mapping. Since one the most important system in an underwater robot is the sensing system or visual identification, AUV control system using visual sensor also has significant role to improve AUV performance. Therefore, visual processing algorithm using Hough Transform is implemented on this work. Robot Operating System (ROS) is deployed to the companion computer in order to handle messages between processes. The result shows that AUV able to do underwater object detection and tracking using Hough Transform and PID algorithm with good tracking accuracy.
Temperature Dependence of the Optical Properties of High-density GaAs Quantum Dots
Ryan P. Smith,김종수,이상준,노삼규,김진수,임재영,송진동 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.9
We investigate the effect of the quantum dot (QD) density on the thermal escape and the retrapping processes of carriers for unstrained GaAs/AlGaAs QDs through temperature-dependent photoluminescence measurements. We fabricated high-density GaAs QDs (8.4 ?10<sup>10</sup>/cm<sup>2</sup>, dot-dot distance ∼34 nm) on an Al<sub>0.3</sub>Ga<sub>0.7</sub>As/GaAs (111)A surface by using droplet epitaxy. The average lateral size and height of the GaAs QDs are 24 and 6 nm, respectively. Temperature-dependent photoluminescence (PL) studies show that high-density GaAs QDs undergo a sigmoidal-shape energy shift. The sigmoidal dependence of the PL peak energy can be explained by thermal escaping of carriers followed by re-trapping by QDs. Our analysis indicates that the re-trapping probability of thermally-escaped carriers increases with decreasing dot-to-dot distance (corresponding to an increase in the QD density).