3,406 research outputs found
Correction to: Visible lattice points along curves
No full textThe article “Visible lattice points along curves”, written by Kui Liu and Xianchang Meng, was originally published electronically on the publisher’s internet portal on 27 July 2020 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 9 July 2021 to © The Author(s) 2020 and the article is forthwith distributed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0
Interaction of Acid Gases SO<sub>2</sub> and NO<sub>2</sub> with Coordinatively Unsaturated Metal Organic Frameworks: M-MOF-74 (M = Zn, Mg, Ni, Co)
No full textFull text access from Treasures at UT Dallas is available only to current UTD affiliates.In situ infrared spectroscopy and ab initio density functional theory (DFT) calculations are combined to study the interaction of the corrosive gases SO₂ and NO₂ with metal organic frameworks M-MOF-74 (M = Zn, Mg, Ni, Co). We find that NO₂ dissociatively adsorbs into MOF-74 compounds, forming NO and NO₃̅. The mechanism is unraveled by considering the Zn-MOF-74 system, for which DFT calculations show that a strong NO₂-Zn bonding interaction induces a significant weakening of the N-O bond, facilitating the decomposition of the NO₂ molecules. In contrast, SO₂ is only molecularly adsorbed into MOF-74 with high binding energy (>90 kJ/mol for Mg-MOF-74 and >70 for Zn-MOF-74). This work gives insight into poisoning issues by minor components of flue gases in metal organic frameworks materials.Department of Energy Grant No. DE-FG02-08ER46491; Simons Foundation Grant No. 391888.Erik Jonsson School of Engineering and Computer Scienc
Suai liang chang haeng lumnam Mun moradok haeng chatphan Kui--Aching
No full textThe author writes about Kui or Suai, the indigenous people of the Northeastern Thailand. This indigenous group concentrates mostly in Surin and Sisaket. Also, there are some groups of them live in Ubonratchathani, Buriram, Nakhon Ratchasima and Mahasarakham. Kui's ways of life are tied closely to elephants. Kui men capture and domesticate wild elephants
Yi zhong li bo kui tan ji duan wu li
No full textM.Phil.Recent detections of gravitational waves from binary black hole coalescences and binary neutron star coalescence give us opportunities to test general relativity in the strong field regime and constrain the nuclear equation of state of the neutron stars.By observing the gravitational waves from binary black hole mergers provide us with the opportunity of testing general relativity in the strong field regime. Evidence of deviation from general relativity can be investigated via comparing the incoming gravitational-wave signal to phenomenological general relativity waveform models including parameterized deviations from general relativity, or additional parameters absent in general relativity. However, the underlying general relativity model that is currently considered does not include all the physics present in general relativity. In particular, it considers only the ` = 2 modes of the gravitational-wave emission omitting the subdominant higher order modes. These have however a strong imprint on the gravitational-wave signal for the case of high mass, highly asymmetric and highly inclined binaries. This imprint might be mimicked by a suitable combination of the parameters deviate from general relativity, leading to fake apparent violations of general relativity. In this work, we perform a systematic study of these false violations across the parameter space of non-spinning binaries.A compact binary with the presence of a neutron star can help us constrain the equation of state of ultradense matter. The feasibility of constraining the equation of state through gravitational waves detections have typically been studied using the inspiral and post-merger stages separately. We quantify the benefits of combining the inspiral and the post-merger stages’ information when analysing binary neutron star signals. Moreover, we show that one can constrain the equation of state by probing at what mass the merged object remains in an extended hyper-massive neutron star phase or promptly collapses into a black hole.Unlike compact binary coalescences, core-collapse supernova or other gravitational-wave bursts cannot be searched with templates due to the complexity of the system. We present a Bayesian null stream method targeted for this kind of signals. We quantify the performance of this method on searching gravitational-wave signal and differentiating it from noise and glitches. Furthermore, we demonstrated the feasibility of testing gravitational-wave polarization with this method.最近對來自雙黑洞和雙中子星合併的重力波的觀測為我們提供了在強場區域中測試廣義相對論和約束中子星核狀態方程的機會。通過觀察來自雙黑洞的重力波，聚結了為我們提供在強場區域中測試廣義相對論的機會。通過比較數據中的重力波信號與現象學廣義相對論波形模型（包括與廣義相對論的參數化偏差或廣義相對論中不存在的附加參數），可以研究偏離廣義相對論的證據。然而，目前考慮的基礎廣義相對論模型並不包括廣義相對論中存在的所有物理。特別是，它只考慮重力波發射的` = 2 模式，省略了次優勢的高階模式。然而，對於高質量，高度不對稱和高度傾斜的雙星合併，這些次優勢的高階模式對於重力波信號具有強烈的印記。這種印記可以通過偏離廣義相對論的參數的適當組合來模仿，從而導致到虛假違反廣義相對論的觀測。在這項工作中，我們對非旋雙黑洞的參數空間中的這些虛假違反進行了系統研究。具有中子星存在的致密雙星系統可以幫助我們約束超密度物質的狀態方程。通過重力波探測來約束狀態方程的可行性通常分別使用螺旋階段和合併後階段進行研究。在分析雙中子星信號時，我們量化了合併螺旋階段和合併後階段信息的好處。此外，我們證明了人們可以通過探測合併後的星體在什麼質量會成為超大質量中子星相或者迅速坍縮成黑洞來約束狀態方程。與雙星合併不同，由於系統的複雜性，無法使用模板搜索核心崩潰超新星或其他重力波爆發。我們提出了針對這種信號的貝葉斯空流方法。我們量化了該方法在搜索重力波信號並將其與噪聲和毛刺區分開時的性能。此外，我們證明了用這種方法測試重力波極性的可行性。Pang, Tsun Ho = 以重力波窺探極端物理 / 彭浚豪.Thesis M.Phil. Chinese University of Hong Kong 2018.Includes bibliographical references (leaves 62-68).Abstracts also in Chinese.Title from PDF title page (viewed on …).Pang, Tsun Ho = Yi zhong li bo kui tan ji duan wu li / Peng Xunhao
Põhiseadus kui süsteem
No full textVäitekirja eesmärk on kinnitada ideed, et põhiseadus on süsteem, ja tuua esile süsteemse lähenemise eelised. Autor leiab, et iga uus kriitiline käsitlus võib heita valgust mõnele põhiseadusliku süsteemi väärtuslikule seosele ja aidata laiendada olemasolevate argumentide ringi. Sissejuhatavas artiklis analüüsib autor kahte põhimõistet – põhiseaduse ja süsteemi mõistet. Esimeses peatükis kaitseb autor põhiseaduse süsteemsuse keskseid teoreetilisi aluseid. Järgnevates peatükkides näitab autor, et idee põhiseadusest kui süsteemist võimaldab meil jõuda põhiseaduse konsistentse ja koherentse dogmaatikani ning leida seeläbi paremaid lahendusi praktilistele põhiseaduslikele juhtumitele.The aim of the thesis is to confirm the idea that the constitution is a system and to demonstrate the advantages of the systematic approach. The author considers that every new critical approach might bring a new valuable connection of the constitutional system to light and help to broaden the scope of available arguments. In the introductory article the author analyses two fundamental concepts – the concept of constitution and the concept of system. In the first chapter the author will defend central theoretical foundations of the systematicity of the constitution. In the following chapters the author demonstrates that the idea of the constitution being a system enables us to achieve consistent and coherent doctrine of constitutional law and therefore better solutions for practical constitutional cases.https://www.ester.ee/record=b526929
Understanding and Controlling Water Stability of MOF-74
No full textMetal organic framework (MOF) materials in general, and MOF-74 in particular, have promising properties for many technologically important processes. However, their instability under humid conditions severely restricts practical use. We show that this instability and the accompanying reduction of the CO2 uptake capacity of MOF-74 under humid conditions originate in the water dissociation reaction H2O → OH + H at the metal centers. After this dissociation, the OH groups coordinate to the metal centers, explaining the reduction in the MOF's CO2 uptake capacity. This reduction thus strongly depends on the catalytic activity of MOF-74 towards the water dissociation reaction. We further show that - while the water molecules themselves only have a negligible effect on the crystal structure of MOF-74 - the OH and H products of the dissociation reaction significantly weaken the MOF framework and lead to the observed crystal structure breakdown. With this knowledge, we propose a way to suppress this particular reaction by modifying the MOF-74 structure to increase the water dissociation energy barrier and thus control the stability of the system under humid conditions."This work was entirely supported by Department of Energy Grant No. DE–FG02–08ER46491. It further used resources of the Oak Ridge Leadership Computing Facility at Oak Ridge National Laboratory, which is supported by the Office of Science of the Department of Energy under Contract DE–AC05– 00OR22725.
CUHK electronic theses & dissertations collection
No full textSiu, Yat Kui Pascal.Thesis M.Phil. Chinese University of Hong Kong 2014.Includes bibliographical references (leaves 46-48).Abstracts also in Chinese.Title from PDF title page (viewed on 08, November, 2016)
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