961 research outputs found
Reconfigurable intelligent surface empowered underlaying device-to-device communication
No full textFunding Information: ACKNOWLEDGMENT This work of Gang Yang, Yating liao, and Ying-Chang Liang was supported by the National Natural Science Foundation of China (Grant No. 61631005, 62071093 and U1801261), the National Key Research and Development Program of China under Grant 2018YFB1801105 , the Fundamental Research Funds for the Central Universities under Grant ZYGX2019Z022, and the Programme of Introducing Talents of Discipline to Universities under Grant B20064. This work of Olav Tirkkonen was supported by Academy of Finland under Grant 319484. Publisher Copyright: ©2021 IEEE.Reconfigurable intelligent surfaces (RIS) are a new and revolutionary technology to achieve spectrum-, energy- and cost-efficient wireless networks. This paper studies the resource allocation for RIS-empowered device-to-device (D2D) communication underlaying a cellular network, in which an RIS is employed to enhance desired signals and suppress interference between paired D2D and cellular links. We maximize the sum rate of D2D users and cellular users by jointly optimizing the resource reuse indicators, the transmit power and the RIS’s passive beamforming. To solve the formulated non-convex problem, we first propose an efficient user-pairing scheme based on relative channel strength to determine the resource reuse indicators. Then, the transmit power and the RIS’s passive beamforming are jointly optimized by an iterative algorithm, based on the techniques of alternating optimization, successive convex approximation, Lagrangian dual transform and quadratic transform. Numerical results show that the proposed design outperforms the traditional D2D network without RIS.Peer reviewe
Supplemental Material - High-resolution climate change during the Marine Isotope Stage 3 revealed by Zhouqu loess in the eastern margin of the Tibetan Plateau
No full textSupplemental Material for High-resolution climate change during the MIS 3 revealed by Zhouqu loess in the eastern margin of the Tibetan Plateau by Zixuan Chen, Qiong Li, Pushuang Li, Jiantao Zhou, Yating Su, Weiming Liu, Yuanlong Luo, Chen Wen, Xuechao Xu and Shengli Yang in Progress in Physical Geography: Earth and Environment</p
Resolving the Puzzle of Charge Carrier Lifetime in ZnO by Revisiting the Role of Oxygen Vacancy
No full textZinc oxide (ZnO) is a wide bandgap prototypical n-type semiconductor due to the presence of intrinsic oxygen vacancies (VO). The VO can readily transfer to the most energetically favorable +2 charged VO (VO2+) by losing two electrons mediated by the metastable VO1+ defect. Nevertheless, the influence of charged VO on the charge dynamics in ZnO and the underlying mechanisms remain elusive. By performing nonadiabatic molecular dynamics simulations of the charge trapping and recombination processes, we show that both VO1+ and VO2+ slow down the nonradiative electron–hole recombination via assisted defect states and, thus, extending charge carrier lifetime compared to pristine ZnO. Our study contributes to identifying the different recombination pathways that take place in VO1+ and VO2+ of n-type ZnO systems, providing useful guidance for designing high-performance ZnO-based devices.Fil: Yang, Yating. Beijing Normal University; ChinaFil: Zhang, Yitong. Beijing Normal University; ChinaFil: Fernández Alberti, Sebastián. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Area Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Long, Run. Beijing Normal University; Chin
A highly hydroxide conductive, chemically stable anion exchange membrane, poly(2,6 dimethyl 1,4 phenylene oxide)-b-Poly(vinyl benzyl trimethyl ammonium), for electrochemical applications
No full textA chemically stable copolymer [poly(2,6 dimethyl 1,4 phenylene oxide)-b-poly(vinyl benzyl trimethyl ammonium)] with two ion exchange capacities, 3.2 and 2.9 meq g-1, was prepared as anion exchange membranes (AEM-3.2 and AEM-2.9). These materials showed high OH-conductivities of 138 mS.cm-1 and 106 mS.cm-1, for AEM-3.2 and AEM-2.9 respectively, at 60°C, and 95% RH. The OH-conductivity = 45 mS.cm-1 for AEM-3.2 at 60% RH and 60°C in the absence of CO2. Amongst the ions studied, only OH-is fully dissociated at high RH. The lower Ea = 10-13 kJ.mol-1 for OH-compared to F- ∼ 20 kJ.mol-1 in conductivity measurements, and of H2O from self-diffusion coefficients suggests the presence of a Grotthuss hopping transport mechanism in OH-transport. PGSE-NMR of H2O and F-show that the membranes have low tortuosity, 1.8 and 1.2, and high water self-diffusion coefficients, 0.66 and 0.26 × 10 cm2.s-1, for AEM-3.2 and AEM-2.9 respectively. SAXS and TEM show that the membrane has several different sized water environments, ca. 62 nm, 20 nm, and 3.5 nm. The low water uptake, "k = 9-12, reduced swelling, and high OH-conductivity, with no chemical degradation over two weeks, suggests that the membrane is a strong candidate for electrochemical applications
Using Ensemble Streamflow Forecasts to Inform Seasonal Outlooks for Water Allocations in the Murray Darling Basin
No full textAbstract not availableTristan D. J. Graham, Quan J. Wang, Yating Tang, Andrew Western, Wenyan Wu, Guy Ortlipp, Mark Bailey, Senlin Zhou, Kirsti Hakala, and Qichun Yan
Role of WD domain-containing proteins in cell cycle progression
No full textIn the eukaryotic proteome, WD domain is one of the most abundant protein motifs. The structure of WD domain allows it to interact with diverse protein partners and proteins containing WD domain have been shown to function in various cellular processes. In this thesis, I describe how two WD domain-containing proteins, LRWD1/ORCA and RFWD3, regulate different aspects of cell cycle progression.
In eukaryotic cells, the duplication of the genome starts from the loading of a six-subunit complex, Origin Recognition Complex (ORC), onto replication origins on the chromosome. The loading of ORC triggers the assembly of the pre-replicative complex (pre-RC) at origins, which licensed the origins prior to entering S phase. Unlike yeast, replication origins in higher eukaryotes do not have consensus sequence and metazoan ORC does not bind to DNA in a specific manner. Thus, a long-standing question in the field has been, how are origins specified and how are ORCs recruited to origins? Studies suggest that ORC loading may be facilitate by ORC-associated proteins. LRWD1/ORCA is an ORC-associated protein that stabilizes ORC on chromatin. We have previously characterized ORCA’s role in replication initiation and heterochromatin organization. In Chapter 2, I describe my work to map the binding sites of ORCA genome-wide by ChIP- seq method at specific time points of G1. ORCA associates with chromatin in a dynamic manner and ORCA binding regions are enriched for heterochromatic marks, including H3K9me3 and methylated-CpGs. ORCA co-localizes with a subset of origins that are enriched for repressive marks, consistent with the fact that these origins replicate late during S phase. Further, ORCA directly associates with the repressive marks and interacts with the enzymes that catalyze these marks. ORCA regulates the level of H3K9me3 and methylated-CpG at its binding sites, suggesting a role of ORCA in maintaining the repressive chromatin marks at its binding sites. Importantly, repressive marks are required for ORCA’s association on chromatin. I propose that ORCA localizes to a subset of origins by association with repressive marks and recruits the enzymes to maintain the repressive chromatin environment.
In Chapter 3, I focus on another WD domain containing protein, RFWD3, and describe how RFWD3 regulates cell cycle progression. Unlike previous studies that described how RFWD3 regulates DNA damage response, I focus on how RFWD3 regulate unperturbed cell cycle progression. I show that RFWD3 is required for proper cell cycle progression. Depletion of RFWD3 causes S phase defects including slower replication fork progression and prolonged S phase. There is also increased loading of replication fork proteins on S phase chromatin in the absence of RFWD3, potentially due to stalled replication fork. RFWD3 associates with the replication fork component, PCNA, via a PIP box motif. I purpose that RFWD3 localizes to replication fork by interacting with PCNA and regulate proper replication fork progression.
In Chapter 4, I summarize my findings on the regulation of DNA replication, chromatin organization and S phase progression. I also discussed interesting areas of research that my work has opened up.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-08-01The student, Yating Wang, accepted the attached license on 2017-07-07 at 10:35.The student, Yating Wang, submitted this Dissertation for approval on 2017-07-07 at 10:47.This Dissertation was approved for publication on 2017-07-09 at 16:22.DSpace SAF Submission Ingestion Package generated from Vireo submission #11332 on 2017-09-29 at 11:14:35Made available in DSpace on 2017-09-29T16:39:20Z (GMT). No. of bitstreams: 2
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Zhodnocení mezinárodní finanční integrace na ekonomický růst v zemích střední a východní Evropy
No full textPráce zkoumá dopad mezinárodní finanční integrace na hospodářský růst v zemích střední a východní Evropy pomocí modelu s obousměrnými fixními efekty s makroekonomickými daty pro 16 zemí střední a východní Evropy v letech 2007 až 2021. Práce vyvozuje několik závěrů. Za prvé, poměr čistého přílivu a odlivu přímých zahraničních investic k HDP nemá významný vliv na hospodářský růst. Stejně tak nejsou významné stavové údaje o PZI pro regresi celého vzorku, zatímco regrese vzorku rozděleného na rozvinuté a rozvojové ekonomiky ukazuje pozitivní vliv závazků z PZI na hospodářský růst u rozvinutých ekonomik a negativní vliv závazků z PZI na hospodářský růst u rozvojových ekonomik. Za druhé, jak pro celkový vzorek, tak pro rozvinuté a rozvojové ekonomiky není žádná z proměnných aktiv portfoliových investic statisticky významná, s výjimkou aktiv portfoliových investic v rozvojových ekonomikách. Zatřetí, dluh portfoliových i ostatních investic negativně ovlivňuje hospodářský růst v rozvojových ekonomikách i v celkovém vzorku, zatímco v případě rozvinutých ekonomik není výsledek významný.The thesis examines the influence of international financial integration on growth in Central and Eastern European economies using a two-way fixed effects model with macroeconomic data for 16 Central and Eastern European countries from 2007 to 2021. The thesis draws several conclusions. First, the ratio of net FDI inflows and outflows to GDP does not present a significant effect on growth. Although the stock data on FDI is similarly not significant for the overall sample regression, the regression of the sample divided into developed and developing economies shows a positive effect of FDI liabilities on economic growth for developed economies and a negative effect of FDI liabilities on economic growth for developing economies. Second, for both the overall sample, developed economies, and developing economies, none of the portfolio investment asset variables are statistically significant, except for portfolio investment assets in developing economies. Third, both portfolio debt and other investment debt negatively affect economic growth in developing economies and the overall sample, while the result is not significant for developed economies.Department of Russian and East European StudiesKatedra ruských a východoevropských studiíFaculty of Social SciencesFakulta sociálních vě
Evaluation of International Financial Integration on Growth in CEE Countries
No full textThe thesis examines the influence of international financial integration on growth in Central and Eastern European economies using a two-way fixed effects model with macroeconomic data for 16 Central and Eastern European countries from 2007 to 2021. The thesis draws several conclusions. First, the ratio of net FDI inflows and outflows to GDP does not present a significant effect on growth. Although the stock data on FDI is similarly not significant for the overall sample regression, the regression of the sample divided into developed and developing economies shows a positive effect of FDI liabilities on economic growth for developed economies and a negative effect of FDI liabilities on economic growth for developing economies. Second, for both the overall sample, developed economies, and developing economies, none of the portfolio investment asset variables are statistically significant, except for portfolio investment assets in developing economies. Third, both portfolio debt and other investment debt negatively affect economic growth in developing economies and the overall sample, while the result is not significant for developed economies
In situ fabrication of fluorine-modified acrylate-based gel polymer electrolytes for lithium-metal batteries
No full textGel polymer electrolytes (GPEs) have attracted substantial interest due to their high lithium-ion conductivities and safety. However, the narrow electrochemical stability windows and poor mechanical properties of conventional GPEs limit their application in batteries targeting high energy densities. Herein, a fluorine-modified acrylate-based GPE is designed and prepared via in situ polymerization, which exhibits a wide electrochemical window, high Li+ transference number and ionic conductivity. The introduced fluorine-rich group can promote the uniform deposition of Li ions and inhibit the growth of Li dendrites, thus enabling stable cycling of Li symmetric cells for 2400 h at 0.1 mA cm−2. Meanwhile, a Li-metal cell with the NCM811 cathode and GPE exhibits promising long-term cycling stability (91% capacity retention after 260 cycles, 2C) and rate capability (e.g., 125 mA h g−1 at 10C), when cycled between 3.0 and 4.5 V at 25 °C. Moreover, this GPE is also successfully utilized in pouch cells, and 81% capacity is maintained after 150 cycles. This study demonstrates the potential of fluorination in promoting the performance of GPEs and can serve as a guideline for the future development of Li-metal batteries with high-nickel layered cathode materials
A novel method for objectively, rapidly and accurately evaluating burn depth via near infrared spectroscopy
No full textThe accurate and objective evaluation of burn depth is a significant challenge in burn wound care. Herein, we used near infrared spectroscopy (NIRS) technology to measure the different depth of thermal burns in ex vivo porcine models. Based on the intensity of the spectral signals and the diffuse reflection theory, we extracted the optical parameters involved in functional (total hemoglobin and water content) and structural (tissue scattered size and scattered particles) features that reflect the changes in burn depth. Next, we applied support vector regression to construct a model including the optical property parameters and the burn depth. Finally, we histologically verified the burn depth data collected via NIRS. The results showed that our inversion model could achieve an average relative error of about 7.63%, while the NIRS technology diagnostic accuracy was in the range of 50 μm. For the first time, this novel technique provides physicians with real-time burn depth information objectively and accurately
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