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  • 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.
21

An Investigation into REIT Performance Persistency

Zhou, Xiaorong 09 January 2009 (has links)
Using a sample of EREIT returns during the period 1993 to 2006 from the CRSP/Ziman REITs database, I construct portfolios of equity REITs based on past raw returns and evaluate their raw returns and risk-adjusted returns during the holding period for persistence. After adjusting for risk with Carhart (1997)’s 4-factor model, I find no evidence of persistence. By implication, a momentum strategy of buying historical winners and short-selling losers does not generate statistically significant abnormal returns. However, I do find strong evidence of performance reversal based on two-year and three-year ranking and holding periods. Consistent with DeBondt and Thaler (1985)’s overreaction theory, investors tend to overreact based on long-term rather than short-term performance records. This would suggest that investors tend to take a much longer period of time to formulate an opinion regarding a REIT’s performance record than previously assumed by earlier researchers. While there is a measurable tendency toward performance reversal, the return spread between the best performing EREITs and worst performing EREITs is marginal. This would indicate that the REIT markets are behaving in a generally efficient fashion. The investigation of the association of EREIT characteristics and performance persistence suggests a property type focus and geographic diversification strategy for EREITs. At the same time, EREITs with high leverage also tend to exhibit good performance persistently.
22

The Sex Reversal Pattern of Scarus ghobban and Scarus rivulatus (Family Scaridae, Teleost)

Shao, Yi-Ta 06 July 2003 (has links)
Abstract Most male individuals of all species of the genus Scarus which were reversed from females, are called ¡§secondary males¡¨. However, a few individuals of ¡§primary males¡¨ would have male¡¦s reproductive ability, but never process sex reversal in their lifespan, and keeping female¡¦s outlook (initial phase). Because parrotfishes have these two kinds of males existing in the same species, they belong to ¡§diandry¡¨ protogynous hermaphroditisms. Previous studies suggested that the mechanisms that cause primary male might be due to social effect or genetic control. In our experiments, Blue barred parrotfish (Scarus ghobban) and rivulated parrotfish (Scarus rivulatus) were used to study the sex reversal model of parrotfish and the possible reasons that cause the juveniles develop to be primary males. This study including three major parts: (1) the relationship between body size and sexual types of two species. (2) the comparison of the tissue structures of the testes in both male types by histological observation. (3) the possible karyotypes difference, i.e. the genetic differences between primary and secondary male. This study shown that the body size of blue barred parrotfish (initial phase: 100-475 mm; terminal phase: 275-525 mm) were larger than rivulated parrotfish (initial phase: 126-270 mm; terminal phase: 246-350 mm), and there was a wider overlap zone between both color phases in Blue Barred parrotfish (S. ghobban: 47.2%, then S. rivulatus: 10.7%). Histological results showed that no matter primary or secondary males, they all had classical lobular testes. But, by contrast of the pure testis tissue of primary male, there were many mature or atric oocytes that remained in the testis of secondary male. Additionally, a few secondary males of the blue barred parrotfish were discovered whose process of sex reversal occurred earlier or faster than that for normal secondary males. Histological evidence further suggested that these individuals had never had a female reproductive function. Furthermore, these males which had no difference with other secondary males was found on the chromosome level. In our study, a heteromorphic chromosome was observed between primary males and secondary males of the rivulated parrotfish (Scarus rivulatus), which could prove that being a primary male is predetermined by a genetic factor. Based on the ecological interactive diversity of the two species, a preliminary hypothesis was put forth to explain those phenomena. Due to the spawning tactics used, the proportion of primary males in rivulated parrotfish populations is much higher than that in blue-barred parrotfish populations. On the other hand, the appearance of premature males was suggested to be a way of supplying sperm which was lacking in the population of the blue-barred parrotfish.
23

Investigation of the Implementation of Ramp Reversal at a Diamond Interchange

Wang, Bo 16 December 2013 (has links)
Diamond interchange design has been commonly utilized in United States to facilitate traffic exchange between freeway and frontage roads. Another less common interchange design is X-ramp interchange, which is the reversed version of diamond. The major benefit of X-ramp interchange is that it can keep travelers on the freeway until the downstream exit ramp to avoid going through the intersection. It also has drawbacks such as travelers with cross street destinations will experience more delay. This study focuses on when the ramp reversal is desirable. To compare the diamond and X-ramp design, an experimental design is conducted using Latin Hypercube Design method. Four varying factors include interchange design type, traffic volume on the frontage road, through movement percentage and saturation rate of the intersection. 40 scenarios are generated for simulation study using Synchro and VISSIM. Based on the simulation study, optimal signal timing strategies are recommended for each type of interchange design under various traffic conditions. Also, ramp reversal is found closely related to the following factors such as interchange frequency, upstream interchange design, traffic volume on frontage road, through movement percentage and intersection saturation rate. Conclusions are made on when X-ramp is better than diamond interchange design. At last, future research directions are recommended.
24

Capabilities of an underwater acoustic volumetric array using time-reversal

Root, Joseph Andrew 08 1900 (has links)
No description available.
25

Violation of parity and time-reversal in atoms and molecules

Ravaine, Boris. January 2007 (has links)
Thesis (Ph D.)--University of Nevada, Reno, 2007. / "May 2007." Includes bibliographical references (leaves 61-63). Online version available on the World Wide Web.
26

The stress is unbearable, I hope it lasts case studies in reversal theory /

Grange, Pippa. January 2005 (has links)
Thesis (D. App. Psych.)--Victoria University (Melbourne, Vic.), 2005. / Includes bibliographical references.
27

Preference reversals in employee evaluations of cash versus non-cash incentives

Shaffer, Victoria A, January 2005 (has links)
Thesis (Ph. D.)--Ohio State University, 2005. / Title from first page of PDF file. Document formatted into pages; contains x, 102 p.; also includes graphics (some col.) Includes bibliographical references (p. 100-102). Available online via OhioLINK's ETD Center
28

Metamotivational reversals during a max VO<<SUBSCRIPT 2>> cycling test

Porter, Erin Elizabeth. January 2006 (has links)
Thesis (M.S.)--Dept. of Exercise and Sport Science, University of Utah, 2006. / Includes bibliographical references (leaves [65]-69).
29

Metamotivational reversals during a max VO₂ cycling test

Porter, Erin Elizabeth. January 1900 (has links)
Thesis (M.S.)--University of Utah, 2006. / Includes bibliographical references (leaves [65]-69). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.
30

Prescriber Knowledge and Perception of Naloxone Use for Opioid Overdose Reversal among Intravenous Drug Users

Poist, Jennifer, Wu, Regina, Peralta, Lourdes, Slack, Marion January 2015 (has links)
Class of 2015 Abstract / Objectives: Evaluate prescriber knowledge on naloxone use for opioid overdose reversals in intravenous drug users. Interview prescribers on their perceptions about intravenous drug users, syringe access programs, and other related topics. Subjects: Prescribers and medical professionals in the State of Arizona. Methods: Medical facilities were contacted by email, fax, or telephone requesting for prescribers to complete the survey and return by email or fax, or call to schedule a face-to-face appointment. The respondents of the survey were kept anonymous and were permitted to answer the survey in free text. Surveys were sent to the 68 selected medical facilities at least twice during the study period. Results: All of the six respondents were male, of the respondents had at least 11 years experience, with two having >30 years. A majority practiced in rehab centers or worked with drug abuse patients, however the number of patients treated per week by respondent varies from 10-320. Also of note five of the six respondents had a family member or relative with an addiction to opioids. The respondents seem to be in support of a naloxone distribution program however it is difficult to draw any conclusions since the number of responses was low. Conclusions: It appears that prescribers have a favorable perception of naloxone use and support harm reduction strategies, however response rate was too low to make any definitive conclusions.

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