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Xia Y-J, Lin J, Tang C, Yin K, Zhong G-Y, Ni G, Peng B, Gan F-X, Huang W. "High-efficiency blue-emitting organic light-emitting devices with 4, 4′, 4 ″-tris (N-carbazolyl)-triphenylamine as the hole/exciton-blocking layer." Journal of Physics D: Applied Physics. 2006;39:4987. Abstract
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Xie Y, Peng B, Bravić I, Yu Y, Dong Y, Liang R, Ou Q, Monserrat B, Zhang S. "Highly efficient blue-emitting CsPbBr3 perovskite nanocrystals through neodymium doping." Advanced Science. 2020;7:2001698. Abstract
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Xie Y, Peng B, Bravić I, Yu Y, Dong Y, Liang R, Ou Q, Monserrat B, Zhang S. "Perovskite Nanocrystals: Highly Efficient Blue-Emitting CsPbBr3 Perovskite Nanocrystals through Neodymium Doping (Adv. Sci. 20/2020)." Advanced Science. 2020;7:2070112. Abstract
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Xu S, Waiganjo P, Dias PG, Shi B. "Testability Prediction for Sequential Circuits Using Neural Network.". In: Proceedings of the 6th Asian Test Symposium. Washington, DC, USA: IEEE Computer Society; 1997:. ATS '97. Abstract
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Xu Y, Zhang H, Shao H, Ni G, Lu H, Zhang R, Peng B, Zhu Y, Zhu H. "Electronic, transport and optical properties of monolayer $$\backslash$alpha $ and $$\backslash$beta-$ GeSe: A first-principles study." arXiv preprint arXiv:1704.03336. 2017. Abstract
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Xu X, Du Q, Peng B, Xiong Q, Hong L, Demir HV, Wong TKS, Kyaw AKK, Sun X. "Effect of shell thickness on small-molecule solar cells enhanced by dual plasmonic gold-silica nanorods." Applied Physics Letters. 2014;105:148\_1. Abstract
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Xu Y, Seward P, Gaye C, Lin L, Olago DO. "Groundwater in Sub-Saharan Africa." Hydrogeology Journal. 2019;27(3):815-822. AbstractWebsite

Sub-Saharan Africa (SSA; Fig. 1) refers to an area encompassing the countries in Africa that are fully, or partially, located south of the Sahara. The remaining African countries are generally referred to as belonging in North Africa. Although the socio-economic and hydrogeological conditions in SSA are diverse, they are sufficiently distinct (in general) from the conditions in North Africa to warrant being assessed separately—for example, high-yielding, high-storage, sedimentary aquifers are more common in North Africa than in SSA, while low-yielding, low-storage, basement aquifers are more widespread in SSA than in North Africa. The use of fossil groundwater is more typical in North Africa, while the use or renewable groundwater is more typical in SSA. Other hydrological characteristics associated with SSA include: groundwater resources that are generally under-utilized; lack of research and development that often prevents the optimal use of groundwater rather than over-development; and a heavy reliance by the rural and urban poor on shallow unconfined or semi-confined groundwater for potable water supplies, other domestic uses, and subsistence agriculture. Because of distinguishing characteristics such as these, there are good reasons for treating the hydrogeology of SSA as a whole, and separate from North Africa.

Xu X, Kyaw AKK, Peng B, Zhao D, Wong TKS, Xiong Q, Sun X, Heeger AJ. "A plasmonically enhanced polymer solar cell with gold–silica core–shell nanorods." Organic electronics. 2013;14:2360-2368. Abstract
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Xu Y, Zhang H, Shao H, Ni G, Li J, Lu H, Zhang R, Peng B, Zhu Y, Zhu H, others. "First-principles study on the electronic, optical, and transport properties of monolayer $\alpha$-and $\beta$-GeSe." Physical Review B. 2017;96:245421. Abstract
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Xu K, Xu Y, Zhang H, Peng B, Shao H, Ni G, Li J, Yao M, Lu H, Zhu H, others. "The role of Anderson’s rule in determining electronic, optical and transport properties of transition metal dichalcogenide heterostructures." Physical Chemistry Chemical Physics. 2018;20:30351-30364. Abstract
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Xu Y, Ning Z, Zhang H, Ni G, Shao H, Peng B, Zhang X, He X, Zhu Y, Zhu H. "Anisotropic ultrahigh hole mobility in two-dimensional penta-SiC 2 by strain-engineering: electronic structure and chemical bonding analysis." RSC advances. 2017;7:45705-45713. Abstract
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Xu Y, Ning Z, Zhang H, Ni G, Shao H, Peng B, Zhang X, He X, Zhu Y, Zhu H. "The anisotropic ultrahigh hole mobility in strain-engineering two-dimensional penta-SiC $ \_2$." arXiv preprint arXiv:1701.03715. 2017. Abstract
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Xu K, Xu Y, Zhang H, Peng B, Shao H, Ni G, Li J, Yao M, Lu H, Zhu H, others. "Electronic, optical and transport properties of van der Waals Transition-metal Dichalcogenides Heterostructures: A First-principle Study." arXiv preprint arXiv:1804.02518. 2018. Abstract
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Xu X, Kyaw AKK, Peng B, Du Q, Hong L, Demir HV, Wong TKS, Xiong Q, Sun X. "Enhanced efficiency of solution-processed small-molecule solar cells upon incorporation of gold nanospheres and nanorods into organic layers." Chemical Communications. 2014;50:4451-4454. Abstract
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Xu X, Kyaw AKK, Peng B, Xiong Q, Demir HV, Wang Y, Wong TKS, Sun X. "Influence of gold-silica nanoparticles on the performance of small-molecule bulk heterojunction solar cells." Organic Electronics. 2015;22:20-28. Abstract
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XuEmail Y, Seward P, Gaye C, Lin L, Olago DO. "Preface: Groundwater in Sub-Saharan Africa." Hydrogeology Journal. 2019;27(3):815-822. Abstractxu2019_article_prefacegroundwaterinsub-sahara1.pdfWebsite

Introduction
Sub-Saharan Africa (SSA; Fig. 1) refers to an area encompassing the countries in Africa that are fully, or partially, located south of the Sahara. The remaining African countries are generally referred to as belonging in North Africa. Although the socio-economic and hydrogeological conditions in SSA are diverse, they are sufficiently distinct (in general) from the conditions in North Africa to warrant being assessed separately—for example, high-yielding, high-storage, sedimentary aquifers are more common in North Africa than in SSA, while low-yielding, low-storage, basement aquifers are more widespread in SSA than in North Africa. The use of fossil groundwater is more typical in North Africa, while the use or renewable groundwater is more typical in SSA. Other hydrological characteristics associated with SSA include: groundwater resources that are generally under-utilized; lack of research and development that often prevents the optimal use of groundwater rather than over-development; and a heavy reliance by the rural and urban poor on shallow unconfined or semi-confined groundwater for potable water supplies, other domestic uses, and subsistence agriculture. Because of distinguishing characteristics such as these, there are good reasons for treating the hydrogeology of SSA as a whole, and separate from North Africa.

Xujing. Comparative Study of China-US MBA Education . : Northeast Normal University ; 2008.

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