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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.

The Study of the Natural Frequency and Bond Stress Loss of the Aged Reinforcement Concrete

Cau, Yih-chrn 13 September 2006 (has links)
Abstract Bridge structures are widely used in the construction for building industrial field in our country. In early time, the materials of the construction and the quality of building cannot match the specification of the governing building due to economic reason. It is caused that both of the ability of vibration resistant and the strength of construction are in dangerous for old building. Therefore, the government established the specifications and standards of the building for the safety and quality. Measuring the bond stress of the armored concrete is included in the standard of the building. The purpose of this research is to study the relationship between natural frequency and bond stress at various ages of armored and the various diameter of reinforcing bar. By comparing the natural frequencies and the bond stress, the results appear that there is no relation between the natural frequency and bond stress in the experiment.

Perspective review on valuing model of convertible bonds

CHEN, CHIEN-CHIH 26 July 2001 (has links)
Convertible Bonds is the most important way to collect capital for a corporate, however the design of Convertible Bonds issue condition is more complicate and the valuing is more difficult. Six models have been used for valuing Convertible Bonds: (1) Black-Scholes Model (2) founded on LYON Model, solved by Binomial Model (3) Numerical Method (4) One State Variable / Two State Variable Finite Difference Method; (5) Contingent Claim Analysis; (6) Artificial Neural Networks Method. The results of the empirical analysis present the theoretical price deviates form market price. In the dissertation, I codify convertible bonds valuing models for this research afterward. Traditional approach is on the assumption that investors have no preference and frictionless market, however, such as: risk-less interest rate¡Bcash dividend¡Bexercise price¡Bunderwriting asset and fluctuant of investment yield¡Bthe conversion strategy of investment¡Bput strategy¡Boptimal call strategy of bonded corporation will affect the valuing of derivative securities. In consequence the issue condition of convertible bonds is more complicate, we would like recommending the Longstaff & Schwartz model (1995) to derive the theoretical value of convertible bonds more effectively. Longstaff & Schwartz (1995) develop the simple method to value risky bonds, which model can value the convertible bonds consist of default risk and interest risk. This model can reflect the default risk, and show two equations for fixed interest and floating interest to value the convertible bonds in the other same conditions.


Lin, Luke 15 August 2001 (has links)

The discounting for initial public offering of convertible bonds

Hsieh, Hung-Yu 01 July 2002 (has links)
Abstract This paper examined the discounting for initial public offering of convertible bonds. We got the samples in Taiwan since 1990 to 2002 and surveyed there was the existing of excess return or not. In addition, we also try to find some variables that are relative to the excess return. After testing and verifying the samples, we had some conclusion¡G 1.There is excess return for the initial public offering of convertible bonds. It means when companies issued the convertible bonds, they discounted the issuing price purposely by some conditions such like coupon rate or conversion price. 2.When we used multi-factors regression to verify which factors are relative to initial return, the factors ¡§the credit ranking of issuing company¡¨ and ¡§trade market¡¨ had powerful influence to the initial return. 3.When we used t-test to verify initial return, we found that if separating the samples with some factors like ¡§company ages¡¨¡B¡§trade market¡¨¡B¡§amount of assets¡¨¡B¡§issuing year¡¨, the initial return had much difference between them.

Zonal isolation improvement through enhanced cement-shale bonding

Liu, Xiangyu, active 21st century 24 February 2015 (has links)
The incompatibility of cement and shale and the subsequent failure of primary cementing jobs is a very significant concern in the oil & gas industry. On wells ranging from hydraulically fractured shale land wells to deepwater wells, this incompatibility leads to an increased risk in failing to isolate zones, which could possibly present a well control hazard and can lead to sustained casing pressure. The cement-shale interface presents a weak link that often becomes compromised by the loads incurred either during drilling, completion/stimulation or production phases. To formulate cements for effective zonal isolation, it is crucial to evaluate the bond strength of the cement-shale interface. Although several studies have focused on the interactions between cement and sandstone, very few studies have addressed the bonding behavior of cement with shale. The conventional push-out test protocol used to measure cement-to-sandstone shear bond strength has proven to be difficult to apply on shale due to its laminated or brittle nature that complicates sample preparation and can lead to shale or cement matrix failure instead of failure at the interface. In this paper, we present a novel, simple and versatile laboratory test procedure to measure the shear bond strength between cement and shale. The new procedure was used to develop cement formulations to improve the cement-to-shale bond. Two different design approaches were investigated. One involves introducing Gilsonite into cement to maintain shale integrity. The second design involves using surfactant to improve cement interfacial sealing property. Our results indicate that bond strength of cement with shale can be enhanced significantly incorporating surfactant in cement slurries. / text

Development of New Resonance Theory and Theoretical Evaluation of Metal-Ligand Binding Energy / 新しい共鳴理論の開発及び金属-配位子間結合エネルギーの理論的評価 / アタラシイ キョウメイ リロン ノ カイハツ オヨビ キンゾク - ハイイシカン ケツゴウ エネルギー ノ リロンテキ ヒョウカ

Ikeda, Atsushi 24 March 2008 (has links)
Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第13840号 / 工博第2944号 / 新制||工||1435(附属図書館) / 26056 / UT51-2008-C756 / 京都大学大学院工学研究科分子工学専攻 / (主査)教授 榊 茂好, 教授 川﨑 昌博, 教授 田中 庸裕 / 学位規則第4条第1項該当

Fixed-income portfolio optimization

Chandrasekhar, Rohan 19 August 2010 (has links)
The fixed maturity, pricing and cash flow characteristics of fixed-income instruments like bonds distinguish them from equities and complicate the application of mean-variance optimization techniques to bond portfolio management. This report examines the challenges involved and reviews some of the theoretical term structure models and empirical estimation methods that have been proposed to address them. An empirical study is conducted which finds evidence of increased interest rate volatility, which affirms the need for a portfolio approach in fixed-income investing. An optimal portfolio of bond funds constructed using the Markowitz method is found to provide the best risk-return profile over the chosen study period, suggesting the viability of this approach as an alternative to holding bonds. / text

Anisotropy in repulsion and dispersion forces between atoms in molecules

Tong, Chong-Sze January 1988 (has links)
No description available.

Reactions and laser activation of carbon acids in hydrogen bonding environments

White, M. S. January 1986 (has links)
No description available.

Thermolysin catalysed peptide bond synthesis

Durrant, I. January 1986 (has links)
No description available.

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