Long, I Ian. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts also in Chinese.

Single crystals of cerium doped lutetium yttrium orthosilicate scintillator (Ce:(Lu(1-X)YX)2SiO5; Ce:LYSO) were grown through Czochralski method to investigate the affection of different growth conditions on the crystal growth. The relationship between thermal field and crystal growth was investigated. Different growth parameters and insulating system were adopted and compared to decrease the temperature gradient. It is found that the new insulating bricks can decrease effectively the temperature gradient and solve the crack problem of grown crystal. The relationship between materials ratio and the impurities in crystals. It is found that the optimized material ratio is Lu2O3:Y2O3:CeO2:SiO2=1.8563:0.1397:0.008:1.99. Under this ratio, we can get the crystals with best macroscopic optical quality. The scintillation properties of grown Ce:LYSO single crystal were measured. Through comparing the data with those in published literatures, it is found that the grown Ce:LYSO crystals present outstanding optical transmission, reaching the theoretical value about 84% in the visible light region. The transmission, UV-excitation and emission spectra are almost identical with the reported ones. The luminescence efficiency (LE) of random chosen 43 Ce:LYSO¡@samples were measured on the £^-ray multi-channel energy spectrum. It is found that the Ce:LYSO samples present stable luminescence efficiency with minimum channel number 3636.37, maximum channel number 4293.78, maximum deviation of 9.91% and standard deviation of 152.24 (3.77%). Annealing treatments were carried out in the air atmosphere on the small pieces of Ce:LYSO single crystals to eliminate the oxygen vacancies in the sample. It is found that the optimized annealing condition to improve the luminescence efficiency of Ce:LYSO is 1400 ¢J, 80 h under air atmosphere.

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The results of a test program incorporating a dual hot wire aspirating probe to radially survey the by-pass duct downstream of an axial flow fan stage are presented. The probe measures time resolved total temperature and total pressure from which isentropic efficiency is calculated. The objective was to provide time resolved data to further the understanding of the flow and aid in determining the source of high losses located near the rotor tip. A technique for quantifying randomness of an unsteady flow is developed, and the randomness of the surveyed flow is shown to correlate with the losses. A new method of ensemble averaging instantaneous data is presented which produces an identifiable blade passage profile even in a random flowfield where traditional techniques often fail. Time averages of the aspirating probe data are shown to agree with conventional steady-state measurements within the experimental uncertainties. Unsteady features seen in the data are compared to similar features noted in the literature, and contour plots of the ensemble averaged data and unsteady fluctuations are presented. / Master of Science

This study examined the influence of state-confidence on aesthetic athletes’ precompetitive imagery function use. Important individual differences effecting functional imagery use require empirical confirmation. Proposed is state-confidence as a factor influencing the functions of imagery used immediately prior to competition. Also, sport type may also be a moderator of the relationship and thus, is constrained in this study. Female aesthetic athletes from Southern Alberta (N = 180, Mage = 14.64, SD = 1.88) completed measures of state-confidence, imagery ability, and frequency of imagery function use. One-way ANCOVA tests revealed that athletes with high state-confidence used significantly more cognitive specific, cognitive general, motivation general-arousal, and motivational general-mastery functions of imagery than low state-confident athletes. Findings imply that applied sport psychology consultants should be more encouraging of preparation strategies with low state-confident athletes. / xi, 64 leaves : ill. ; 28 cm

共同基金是未來投資理財約主流!專業法人機構在股市之投資比重日益提高，對國內證券市場生態產生結構性改變。展望未來趨勢，隨著股市發展成熟化、上市上櫃公司遽增與金融市場情勢連動關係複雜化等因素，專業投資理財時代的來臨必將成為事實。「專業、分工理財」投資型態將逐漸取代以往投資人自行下海操作之「自助式理財」型態。故共同基金操作績效正是進行本評鑑研究的最大動機，其中辨認基金經理人操作策略與績效顯現最具代表性的指標--選股能力與擇時能力．乃本研究所欲深入探討的主題。本研究模型之構建乃根據 Lee-Rahman (1990) 所提出之改良評鑑模式，簡言之，該模型的發展歷經早期 Treynor & Mazuy (1966) 的理論雛形，並經過 Jensen 針對評鑑擇時能力方面之改進，然後再經由 Bhattacharya & Pfleiderer (1983) 的進一步修正，產生了較完善的整體架構，最後經由 Lee-Rahman (1990) 針對評鑑過程中評鑑迴歸式之殘餘項異質性問題，作一根本的解決，建構完整的基金選股與市場擇時能力績效之評鑑模式。同時並運用幾個傳統績效評鑑指標 (即 Treynor、 Sharpe 與 Jensen 指標三種)，作為基金整體性績效之輔助研究。 實證結果顯示:(一)在基金整體績效評估方面，得到的結果顯示不論研究期間的長短．基金表現擊敗大盤的比例皆高於五成，約介於 60% 至 70% 左右，而在 Treynor、Sharpe 與 Jensen 指標三種不同評鑑模式分析下，基金績效排名有相當顯著的一致性。(二)在選股與市場擇時能力評鑑( Lee-Rahman 修正模型)方面:1.同時兼具選股與市場擇時能力的基金皆有穩定的一致性;2.大多頭時期基金擇時能力普遍提昇、新投信基金績效表現較優異。(三)整合比較結論方面:1.本研究中不同的評鑑模式所得實證結果十分肯定基金績效的持續性與穩定性;2.基金顯著的擇時能力並非基金整體績效脫穎而出的決定性因素，績效傑出與否幾乎決定於選股功力因素:3.台灣股市投資 Bottom-up 的投資邏輯漸漸取代 Top-down ;4.新投信績效已有凌駕老投信的趨勢。 / Mutual Funds Investment will be very popular! While the professional institutionalist's participation being promoted, domestic stock market environment has beenchanged structurally. In the future, accompanied by several reasons such us the_maturationof stock market, dramatic increasing in listed company numbers and more complex correlation in international financial markets, the age stressing on professional financial adversary will come. "Professional financial investment and adversary" will substitute for"Self-adversary" investment. Therefore, measuring the mutual fund's performance is the mailmotivation of my study', and the insight in selectivity ability and market timing ability will bethe subject for further research. The research model is based on the Lee-Rahman's modified model (1990), that is, the model structure was first built by Treynor & Mazuy (1966), improved by Jensen in Timingability measurement, and then revised by Bhattacharya & Pfleiderer (1983), and throughout structured by solving the "heteroscedasticity" in error terms of regressions finally Therefore, the better integral research model on measuring selectivity ability a timing abilityhas been accomplished. Meanwhile, we also use three traditional performance measure(Treynor, Sharpe & Jensen index) to be the general performance research. Empirical results show that (1)By measuring the general performance of mutual funds, we know that about 60%-70% funds managers beat market at each research period, and there exists consistency of fund's performance ranking among those three measures. (2) By using Lee-Rahman modified model (1990), we got three conclusions. First, for those funds consist of selectivity and timing ability, there exists consistency. In bull market period, timing ability of most funds performed better generally, and new funds had better performance. (3) Integral comparative conclusions have four results. First, no matter what measures being used, empirical results confirm stability and consistency in performance ranking. Second, significant timing ability is not the determinate factor of significant performance, significant selectivity ability plays the determinate role. Third, in Taiwan, bottom-up investment strategy gradually substitutes for top-down investment strategy. Finally, new mutual funds investment co. had outperformed old mutual funds investment institutions.