• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 385
  • 133
  • 28
  • 27
  • 22
  • 20
  • 17
  • 13
  • 12
  • 7
  • 4
  • 2
  • 2
  • 2
  • 1
  • Tagged with
  • 835
  • 288
  • 268
  • 98
  • 89
  • 80
  • 75
  • 74
  • 74
  • 73
  • 73
  • 67
  • 65
  • 57
  • 55
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
401

Increasing Sensitivity for Electron Paramagnetic Resonance Spectroscopy of Cupric Ions in Metal-Organic Framework Single Crystals and Thin Films

Friedländer, Stefan 25 July 2017 (has links)
No description available.
402

Metal-organic frameworks as modern tools for isomerism, photophysics and spin chemistry

Ayodele, Mayokun Joshua 01 September 2021 (has links)
No description available.
403

Covalent Organic Framework Electrodes for Aqueous Zinc Ion Energy Storage

Wang, Wenxi 20 October 2021 (has links)
The growing renewable energy consumption has stimulated the rapid development of diverse energy storage systems (ESSs) in our electronic society. As a successful representative, lithium-ion batteries (LIBs) play a vital role in meeting today's energy storage demand. However, LIBs are plagued by intrinsic unsafety and detrimental environmental contamination. In this respect, rechargeable aqueous zinc-ion batteries (ZIBs) and supercapacitors (SCs) as potential alternatives have attracted considerable attention due to their characteristics such as innate safety, environmental friendliness, cost-effectiveness, competitive gravimetric energy density, and loose fabrication process. Inspired by these merits, massive efforts have been devoted to designing and exploring high-performance aqueous Zn-based energy storage devices. The key for advanced Zn-based energy storage devices is to exploit high-performance cathode materials. Covalent organic frameworks (COFs) are an emerging class of organic polymer with periodic skeletons showing attractive properties in structural tunability, well-defined porosity, functional versatility, and high chemical stability. The distinguishing features of COFs make them promising electrode materials for electrochemical energy storage applications. However, the electrochemical storage capability and charge storage mechanism of COF materials have been rarely investigated, and their potential applications have not been evaluated yet so far. In this thesis, COFs are proposed as cathode materials for rechargeable aqueous Zn-ion energy storage. Initially, a new phenanthroline COF (PA-COF) material was synthesized and used as an electrode for Zn-ion supercapatteries (ZISs) for the first time. The as-synthesized PA-COF shows abundant nucleophilic sites and suitable pore structure, demonstrating the efficient storage capability of Zn2+ and H+. Further, hexaazatriphenylene-based COF (HA-COF) material with and without precisely grafted quinone functional groups has been proposed to understand structure-activity relationships. In this chapter, the influence of quinone groups on the electrochemical performance of HA-COF has been systematically studied, disclosing an enhancement coordination capability of Zn ions against protons in the quinone-functionalized HA-COF. Lastly, we synthesized a radical benzobisthiazole COF (BBT-COF) and deeply investigated the electrochemical performance. As expected, this COF electrode shows an ultrastable cycling performance and demonstrates a radical reaction pathway.
404

Reorganizace a restrukturalizace v českém a evropském právu / Reorganisation and restructuring in Czech and European Law

Pume, Marek January 2021 (has links)
Reorganisation and restructuring in Czech and European Law This thesis deals with the Czech and European legal regulation of corporate bankruptcy rehabilitation. In the first part, the Czech variant of reorganisation in insolvency proceedings is analysed and then compared with the German and Dutch legislation. The phases preceding the decision to reorganise a company, such as the court moratorium, the drafting, approval and effects of the reorganisation plan, credit financing and the valuation of the debtor's assets are discussed. In the second part, this paper examines the Restructuring and Insolvency Directive accepted in 2019 by European Union and the reasons for its adoption. It outlines the possible ways of implementing this directive in the Czech legal system and the pitfalls that will have to be dealt with. It also explains the most important institutes introduced by the Directive, such as early warning systems, financing of the debtor and the elements of restructuring plans. Since the Directive has already been transposed into the laws of Germany, Netherlands and Greece, this paper also looks at the form of their arrangements. Finally, these types of corporate recovery solutions are compared, their advantages and disadvantages are presented, and the implications of the new institute of...
405

Studies on Porous Coordination Polymers for Methane Purification / メタン精製用多孔性配位高分子に関する研究

Inubushi, Yasutaka 23 March 2017 (has links)
京都大学 / 0048 / 新制・論文博士 / 博士(工学) / 乙第13089号 / 論工博第4150号 / 新制||工||1675(附属図書館) / (主査)教授 北川 進, 教授 杉野目 道紀, 教授 宮原 稔 / 学位規則第4条第2項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
406

Synthesis and Formation Mechanism of Carbon Materials from Porous Coordination Polymers / 多孔性配位高分子を用いた炭素材料の合成とその形成機構の解明

Fujiwara, Yu-ichi 26 March 2018 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第21125号 / 工博第4489号 / 新制||工||1698(附属図書館) / 京都大学大学院工学研究科合成・生物化学専攻 / (主査)教授 杉野目 道紀, 教授 吉田 潤一, 教授 松田 建児 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
407

Controlled radical polymerization in designed porous materials / デザイン性ナノ空間材料を用いた制御ラジカル重合

Mochizuki, Shuto 25 March 2019 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第21797号 / 工博第4614号 / 新制||工||1719(附属図書館) / 京都大学大学院工学研究科合成・生物化学専攻 / (主査)教授 杉野目 道紀, 教授 松田 建児, 教授 大内 誠 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
408

A Gas Flow-Through System for Hydrogen Isotopic Separation with Metal-Organic Frameworks

Rigdon, Katharine Harp January 2019 (has links)
No description available.
409

The Removal of Lead Ions from Water Using Thiophene-Containing Metal-Organic Frameworks

Geisse, Alissa Renee 23 August 2019 (has links)
No description available.
410

Surface-strip coal mine rehabilitation risk assessment : the development of an integrated rehabilitation risk assessment model for use in South Africa and Australia

Weyer, Vanessa Derryn January 2020 (has links)
Surface-strip coal mine rehabilitation planning in South Africa and Australia is immature. Rehabilitation risk assessment, despite being advocated by leading practice guidelines and in some instances by legislation, is conducted with minimum requirements often met by rehabilitation professionals. Specialist data is gathered during mine approval and for the environmental impact assessment process. However, the focus of this is toward assessing mining impacts and not for rehabilitation risk assessment. Quantitative, integrated, multi-disciplinary rehabilitation risk assessment is seldom undertaken. This thesis provides a methodology towards the development of a quantitative, integrative, multi-disciplinary rehabilitation risk assessment model. Its purpose being to 'profile' surface-strip coal mine sites, in terms of their rehabilitation risk and potential for rehabilitation failure, from the outset of mine operations, with adjustments possible progressively during mine operations. The methodology was developed by first reviewing techniques suitable for the development of the model, as well as techniques developed by others. Bayesian networks (BN) were found to be the most suited. A R2AIN framework was then provided as a process towards developing several BN risk event models that can amalgamate to form a synthesis rehabilitation risk assessment model. A case study soil compaction BN model was used to demonstrate the framework in South Africa and Australia. The case study showed that it is possible to integrate and quantify rehabilitation risk, and most importantly to segregate risk into discrete contributing multidisciplines for analysis. Risk percentages can be calculated per multi-discipline, per mine phase, per site, to aid site risk ‘profiling’. It is recommended that further risk event BN models be prioritised for development and that a rehabilitation risk assessment model be developed to synthesise these into one model. This will require continuous improvements in the method, to build confidence, including extensive risk event and synthesis BN model evaluation and testing; improved BN input node states and values; and simplification of the conditional probability table construction method. Adaptation to other mining types, development activities and other regions should be investigated, as well as spatial linkages to geographic information systems. This research contribution improves upfront mine rehabilitation planning and decision making, providing improved tools and techniques than what currently exist. / Thesis (PhD)--University of Pretoria, 2020. / Geography, Geoinformatics and Meteorology / PhD / Unrestricted

Page generated in 0.0555 seconds