272 research outputs found
Behavioral transition: A framework for the construction conflict - Tension relationship
No full text“© 20XX IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.”Conflicts are inevitable in construction projects. One of the reasons is that all construction projects involve complex human interactions. Previous studies have shown that behavioral states can respond dynamically as the magnitude of a conflict increases. This has been empirically demonstrated using a catastrophe-theory-based, three-variable system involving the level of construction conflict, the level of tension, and the amount of behavioral flexibility (Yiu and Cheung, 2006). This paper reports on a study that builds on the above-mentioned study by Yiu and Cheung, and examines the application of moderated multiple regression (MMR) to the three-variable system. It was found that not all MMR models display a significant moderating effect. Two out of six MMR models were found to be significant in their effect. These models affirm that the nature of the relationship between the degree of uncertainty and adversarial attitudes (or mistrust level) varies, depending on the behavioral flexibility of the parties. Disordinal interactions were also found, suggesting that the interaction between behavioral flexibility and the conflict-tension relationship can change radically. Critical points for the degree of uncertainty were also able to be calculated. Beyond these points, even a flexible individual may find difficulty in minimizing or resolving construction conflicts. As such, it is suggested that such radical changes could be prevented by minimizing the degree of uncertainty in construction projects. © 2007 IEEE.Publishe
Chiral ruthenium(IV)-oxo complexes. Structure, reactivities of [Ru(terpy)(N∩N)O]2+ (N∩N = N,N,N′,N′-tetramethyl-1,2-diaminocyclohexane) and [Ru(Me3tacn)(cbpy)O]2+ (cbpy = (?)-3,3′-[(4S-trans)-1,3-dioxolane-4,5-dimethyl]-2,2′-bipyridine)
No full textCUHK electronic theses & dissertations collection
No full textYiu, Wing Ho.Thesis M.Phil. Chinese University of Hong Kong 2015.Includes bibliographical references (leaves 27-30).Abstracts also in Chinese.Title from PDF title page (viewed on 03, January, 2017)
Zhun fang gu kuang jie gou liang zi lin jie dian he chao dao xing
No full textPh.D.Tuning a system towards a quantum critical point (QCP) has been an effective way to search for or enhance superconductivity. Intense studies have been performed near magnetic QCPs where superconductivity often emerges. On the other hand, systems featuring a structural QCP are rare, but they have begun to gain attentions recently. The existence of structural QCPs has been suggested in LaCu₆₋ₓAuₓ and ScF₃. Nevertheless, superconductivity has not been observed in these systems. In contrast, the quasi-skutterudites (CaxSr₁₋ₓ)₃Rh₄Sn₁₃ were found to be conventional superconductors featuring a structural QCP. Therefore, (CaxSr₁₋ₓ)₃Rh₄Sn₁₃serves as a platform to study the interplay between structural instability and superconductivity. This thesis explores several topics related to this theme.We have measured and analyzed the specific heat capacity data of(CaxSr₁₋ₓ)₃Rh₄Sn₁₃, in the normal and superconducting states, for seven x values straddling across the putative structural QCP (x ≈ 0.9), around which Tc is maximized. In the vicinity of the structural QCP, 2∆/kBT and ∆C/γTc values are found to be enhanced far beyond the BCS values, indicating strong coupling superconductivity; meanwhile, the Debye temperature is found to be significantly reduced which we attributed to the softening of a phonon mode responsible for the structural transition.While our heat capacity data offer the evidence of phonon softening, a more direct, microscopic evidence is highly desirable. Hence, we designed an inelastic X-ray scattering experiment to probe the lattice dynamics in(CaxSr₁₋ₓ)₃Rh₄Sn₁₃. We successfully detected the softening of phonon modes around the M point on cooling towards the structural transition. Intriguingly, at x = 0.85, the soft mode energy squared at the M point extrapolates to zero at nearly 0 K, providing the first compelling microscopic evidence of a structural QCP in (CaxSr₁₋ₓ)₃Rh₄Sn₁₃.In addition to (CaxSr₁₋ₓ)₃Rh₄Sn₁₃, we also investigated La₃Co₄Sn₁₃, which is another quasi-skutterudite superconductor with structural instability. By using the combination of specific heat capacity, X-ray diffraction and computational results, we established that La₃Co₄Sn₁₃ has a second-order structural transition, in contrast to the first-order case, reported earlier by another group. Besides, density functional theory calculation on phonon dispersion relation shows structural instability at the M point, similar to the case in Sr₃Rh₄Sn₁₃. Hence, our results show that La₃Co₄Sn₁₃ is another platform to study the interplay between structural instability and superconductivity.將一個系統調至量子臨界點（QCP）是尋找或加強超導性的一種有效方法。超導現象經常出現在磁性QCP附近，因而大量相關的研究已經進行。另一方面，雖然具有結構QCP的系統非常罕見，但是最近它們亦開始受到關注。結構QCP被指出可能存在於LaCu₆₋ₓAuₓ和ScF₃系統中，可是，超導性仍未在這些系統中被發現。相反，屬於傳統超導體的準方鈷礦(CaxSr₁₋ₓ)₃Rh₄Sn₁₃則被發現呈現結構QCP的特性。因此，(CaxSr₁₋ₓ)₃Rh₄Sn₁₃可以作為一個用來研究結構不穩定性和超導性之間相互作用關係的平台。本文將會探討與此主題相關的幾個議題。我們測量並分析了(CaxSr₁₋ₓ)₃Rh₄Sn₁₃在常態和超導狀態下的比熱容數據，x為七個不同的數值橫跨於假定的結構QCP（x≈0.9），而圍繞此處的超導臨界溫度Tc亦是最高的。在靠近結構QCP時，2∆/kBTc跟∆C/γTc的數值能提高至超出BCS值，顯示了其大的耦合超導性。同時，德拜溫度被發現顯著地減低，而我們把這歸因於負責結構相變的聲子模軟化。雖然我們的熱容量數據提供了聲子模軟化的證據，但是我們的假設需要一個更直接的微觀證據來支持。因此，我們進行了一個非彈性X射線散射實驗來探測(CaxSr₁₋ₓ)₃Rh₄Sn₁₃的晶格動力學。我們成功探測到倒晶格空間M點周圍的聲子模在冷卻至結構相變的過程中軟化。更有趣的是，於x=0.85，把於M點的軟模能量平方外推至零的相應溫度非常接近0K，因此為(CaxSr₁₋ₓ)₃Rh₄Sn₁₃結構QCP的存在提供了首個令人信服的微觀證據。除了(CaxSr₁₋ₓ)₃Rh₄Sn₁₃，我們還研究了另一具有結構不穩定性的準方鈷礦超導體La₃Co₄Sn₁₃。結合比熱容量、X射線衍射和理論計算的結果，我們確定了La₃Co₄Sn₁₃擁有二級結構相變，這剛好與另一組早前報告的一級結構相變結果相反。除此之外，聲子色散關系的密度泛函理論計算顯示在M點存在結構不穩定性，與Sr₃Rh₄Sn₁₃的情況相似。因此，我們的研究結果顯示，La₃Co₄Sn₁₃提供了另一研究結構不穩定性和超導性相互作用的平台。Cheung, Yiu Wing = 準方鈷礦結構量子臨界點和超導性 / 張耀榮."October 2018."Thesis Ph.D. Chinese University of Hong Kong 2019.Includes bibliographical references (leaves 77-80).Abstracts also in Chinese.Title from PDF title page (viewed on …).Cheung, Yiu Wing = Zhun fang gu kuang jie gou liang zi lin jie dian he chao dao xing / Zhang Yaorong
Growth modification and characterization of silicon based materials.
No full textby Cheung Wing-yiu.Thesis (Ph.D.)--Chinese University of Hong Kong, 1995.Includes bibliographical references (leaves [170-185]).ACKNOWLEDGMENT --- p.Iabstract --- p.IIcontents --- p.IVfigure captions --- p.C-1table captions --- p.C-10photo captions --- p.C-11Chapter CHAPTER 1 --- INTRODUCTION --- p.1Chapter 1.1 --- Novel Silicon-Based Materials Structures - Background and Perspectives --- p.2Chapter 1.2 --- Light Emission from Porous Silicon --- p.3Chapter 1.2.1 --- Quantum size effect --- p.7Chapter 1.2.2 --- Chemical luminescence model --- p.9Chapter 1.3 --- Germanium Silicon Alloy --- p.11Chapter 1.3.1 --- Formation of germanium silicon alloy by ion implantation --- p.16Chapter 1.4 --- Scope of this Work --- p.19Chapter CHAPTER 2 --- EXPERIMENTAL METHODS --- p.20Chapter 2.1 --- Preparation of Porous Silicon Layers --- p.20Chapter 2.1.1 --- Anodization --- p.21Chapter 2.1.2 --- Post - anodization treatments --- p.25Chapter 2.2 --- Preparation of Germanium Silicon Alloy --- p.27Chapter 2.2.1 --- Ion implantation --- p.27Chapter 2.2.2 --- Thermal treatment --- p.27Chapter 2.3 --- Characterization Methods --- p.28Chapter 2.3.1 --- Microscopy studies --- p.28Chapter 2.3.2 --- Structural studies --- p.30Chapter 2.3.3 --- Compositional studies --- p.31Chapter 2.3.4 --- Electron spin resonance --- p.32Chapter 2.3.5 --- Optical methods --- p.36Chapter 2.3.6 --- Electrical measurements --- p.38Chapter 2.3.6.1 --- Spreading resistance profiling --- p.38Chapter 2.3.6.2 --- Other electrical measurements --- p.40Chapter CHAPTER 3 --- POROUS SILICON - RESULTS --- p.41Chapter 3.1 --- General observation of on the Appearance of Samples --- p.41Chapter 3.2 --- Formation Current Voltage Characteristics --- p.41Chapter 3.3 --- Surface Morphology --- p.52Chapter 3.4 --- Electron Spin Resonance --- p.56Chapter 3.5 --- Composition Characteristics --- p.68Chapter 3.6 --- Optical Characteristics --- p.72Chapter 3.6.1 --- Infra-red transmittance studies --- p.72Chapter 3.6.2 --- Photoluminescence --- p.74Chapter 3.7 --- Electrical Properties --- p.82Chapter CHAPTER 4 --- POROUS SILICON - DISCUSSION --- p.84Chapter 4.1 --- Formation Properties --- p.84Chapter 4.2 --- Structural Properties --- p.87Chapter 4.3 --- Paramagnetic Centres in Porous Silicon --- p.88Chapter 4.4 --- Compositional Properties --- p.93Chapter 4.5 --- Photoluminescence --- p.95Chapter 4.6 --- Electrical Properties --- p.105Chapter 4.7 --- Summary --- p.106Chapter CHAPTER 5 --- GERMANIUM SILICON ALLOY - RESULTS --- p.108Chapter 5.1 --- Structural Characteristics --- p.108Chapter 5.1.1 --- Defect structure --- p.109Chapter 5.1.2 --- Crystal structure --- p.115Chapter 5.2 --- Optical Characteristics --- p.127Chapter 5.3 --- Electrical characteristics --- p.129Chapter 5.3.1 --- Spreading resistance profiling --- p.129Chapter 5.3.2 --- Other electrical measurements --- p.138Chapter CHAPTER 6 --- GERMANIUM SILICON ALLOY - DISCUSSION --- p.142Chapter 6.1 --- Structure Analysis --- p.142Chapter 6.2 --- Optical Properties --- p.146Chapter 6.3 --- Electrical Properties --- p.147Chapter 6.4 --- Summary --- p.150Chapter CHAPTER 7 --- CONCLUSIONS --- p.152Chapter 7.1 --- Porous Silicon --- p.152Chapter 7.2 --- Germanium Silicon Alloys --- p.154Chapter CHAPTER 8 --- FURTHER WORK --- p.156Chapter 8.1 --- Porous Silicon --- p.156Chapter 8.2 --- Germanium Silicon Alloys --- p.156APPENDIXChapter I --- SPECTRA OF GERMANIUM SILICON ALLOY --- p.A1Chapter 1.1 --- Rutherford Backscattering Spectra --- p.A2Chapter 1.2 --- Spreading Resistance Depth Profile --- p.A8Chapter II --- PUBLICATIONS --- p.A14BIBLIOGRAPHY --- p.A1
Erratum:Micro-RNA Clusters Integrate Evolutionary Constraints on Expression and Target Affinities: The miR-6/5/4/286/3/309 Cluster in Drosophila (Molecular Biology and Evolution (2020) 37:10 (2955–2965) DOI: 10.1093/molbev/msaa146)
No full textThis is a correction to: Qu Zhe, Wing Chung Yiu, Ho Yin Yip, Wenyan Nong, Clare W C Yu, Ivy H T Lee, Annette Y P Wong, Nicola W Y Wong, Fiona K M Cheung, Ting Fung Chan, Kwok Fai Lau, Silin Zhong, Ka Hou Chu, Stephen S Tobe, David E K Ferrier, William G Bendena, Jerome H L Hui, Micro-RNA Clusters Integrate Evolutionary Constraints on Expression and Target Affinities: The miR-6/5/4/286/3/309 Cluster in Drosophila, Molecular Biology and Evolution, Volume 37, Issue 10, October 2020, Pages 2955–2965, https://doi.org/10.1093/molbev/msaa146 Upon original publication, the term ‘microRNA’ was incorrectly given as ‘micro-RNA’ in the title, Key words and throughout the main body of the paper. In addition, the name and surname of author Zhe Qu were inadvertently transposed. These details have been corrected only in this correction notice to preserve the published version of record.</p
Limited gains: grassroots mobilization and the environment in Hong Kong
No full textpublished_or_final_versionPrefaceThe Contributors16 Conclusions Peter Hills Hills, Peter Cecilia Chan Chan, Cecilia 2011 The Context Cecilia Chan Chan, Cecilia Peter Hills Hills, Peter 12 Grassroots Mobilization for Environmental Protection: Tactics and Dilemmas Cecilia Chan Chan, Cecilia 153 Environmental Protection in Hong Kong: An Historical Account Pauline Choi Choi, Pauline 294 The Politicization of the Environment Hung Wing Tat Hung, Wing Tat 415 The Role of District Boards in Community-based Environmental Management Hung Wing Tat Hung, Wing Tat 516 Mobilizing Tsing Yi Residents Against Environmental Hazards Ng Hang Sau Sau, Ng Hang 637 Creating a Decent Environment for the Poor: Housing for Low-income Groups Pauline Choi Choi, Pauline 838 The Environment and Grassroots Participation in Squatter Areas Ng Yiu Fai Fai, Ng Yiu 999 Environmental Improvement Efforts in Temporary Housing Areas Chui Wing Tak Chui, Wing Tak 11710 Combatting Urban Blight Fung Ho Lup Lup, Fung Ho 13711 Tackling Environmental Pollution in Sham Tseng Fiona Chang Chang, Fiona 14912 Attitudinal and Behavioural Change in Environmental Protection Cecilia Chan Chan, Cecilia 16113 Environmental Education for the Public: A Rubbish Recycling Scheme in a Middle Class Housing Estate Mok Hing Luen Luen, Mok Hing Lau Kwong Kit Kit, Lau Kwong 17714 The Campaign Approach in Grassroots Mobilization Regina Cheung Cheung, Regina 18715 Towards a Healthier Working Environment in Hong Kong K.K. Chan Chan, K. K. 19
Three essays in threshold models on Chinese and Hong Kong economies
No full textThis thesis consists of three essays in threshold models on Chinese and Hong Kong Economies. The first essay discovers that capital inflow from non-residents can stimulate the service imports of the Chinese mainland, with a greater effect being found when the size of the capital inflow exceeds a time-varying threshold depending on the economic capacity of the Chinese mainland. The service exports of Hong Kong are shown to benefit from this development. The second essay studies the factory rent in Hong Kong, in which it is demonstrated that not only demand from the retail property rental market has been a factor in the recent increase of factory rent, but demands from the office rental market and domestic households have also contributed to the rise in factory rent since 2006 Q1 via a threshold regression. The third essay studies the effects of visitors’ income on their spending whilst visiting Hong Kong and discovers the different scales of such effects between Asian and non-Asian visitors through threshold models. Together with the findings of Chong and Yiu (2019) and the second essay of this thesis, which prove the causal impacts of the tourist arrivals on residential property rent and factory rent in Hong Kong respectively, this essay provides evidence for the contribution of the income growth of other economies to the surge in Hong Kong’s residential property and factory rents via the tourism industry.本論文由三篇關於中國內地和香港門檻模型的文章所組成。第一篇文章發現來自非本地居民的資金流入會刺激中國內地的服務輸入，而當該資金流入的規模大於一個取決於中國內地經濟規模的隨時間變動門檻的時候，資金流入對服務輸入的效果會更大。第二篇文章探討香港工廠大廈的租金，透 過門檻迴歸證明了最近工廠大廈租金的上升不只由零售物業的租賃需求所帶動，自 2006年第一季起更來自辦公室的租賃以及本地居民的需求。第三篇文章研究旅客的收入水平對他們遊覽香港時消費總額的影響，透過門檻模型發現該影響規模在亞洲旅客和非亞洲旅客之間存在差異。結合 Chong and Yiu (2019) 以及本論文的第二篇文章關於旅客對香港住宅租金和工廠大廈租金影響的發現，本文章證明了其他經濟體的經濟增長會透過旅遊業導致香港住宅和工廠大廈租金上升。Yiu, Wing Ho.Ph.D. Chinese University of Hong Kong 2020.Includes bibliographical references.Abstracts also in Chinese.Title from PDF title page (viewed on October 11, 2022)
CUHK electronic theses & dissertations collection
No full textNg, Wing Fung.Thesis Ph.D. Chinese University of Hong Kong 2015.Includes bibliographical references (leaves 109-124).Abstracts also in Chinese.Title from PDF title page (viewed on 31, October, 2016)
Filtering of false positive microRNA candidates by a clustering-based approach
No full textpublished_or_final_versionComputer ScienceMasterMaster of Philosoph
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