Now showing items 561-580 of 8484

• #### A three-dimensional finite element method for quantifying stress shielding following total hip replacement ﻿

(1993)
One of the critical problems associated with total hip replacement is the loosening of femoral stem. A major cause of femoral stem loosening is believed to be stress shielding of the proximal femur following implantation. ...
• #### A three-pulse algorithm for minimum-fuel rotational maneuvers ﻿

(2004)
Spacecraft equipped with a Reaction Control System (RCS) for attitude control typically utilize a "bang-off-bang" control algorithm for rotational maneuvers. This type of algorithm, which commands two distinct control ...
• #### A time series analysis of the Japanese yen ﻿

(1988)
This paper sought to address the question as to whether the exchange rate can be forecasted more accurately by a monetary model of exchange rate determination or the random walk in the case of the Japan-U.S. exchange ...
• #### A time series approach to quality control ﻿

(1991)
One way that a process may be said to be "out-of-control" is when a cyclical pattern exists in the observations over time. It is necessary that an accurate control chart be developed to signal when a cycle is present in ...
• #### A total synthesis of (+,-)-quinocarcin ﻿

(1988)
A synthetic route via the key intermediate DX-52-1 21 has resulted in the first total synthesis of the complex antitumor antibiotic quinocarcin 1. Salient features include an acyliminium ion-mediated stereoselective ...
• #### A transient methodology for evaluating risk reduction associated with ground water remediation at leaking underground storage tank sites ﻿

(1995)
A methodology to determine risk as a function of time varying concentration was developed and applied to three leaking underground storage tank sites for five remediation scenarios, to demonstrate the risk reduction ...
• #### A TRANSLATION AND STUDY OF THE "CHRONICON MONASTERII DE ABINGDON" (MONASTICISM, WOMEN, ENGLAND, JOSEPH STEVENSON) ﻿

(1986)
The Chronicon Monasteril de Abingdon, edited by the Reverend Joseph Stevenson, was first published in 1858 as part of the Rolls Series. The chronicle narrates the history of one of England's most distinguished monastic ...
• #### A triple approximation to the concept of aspect in Spanish ﻿

(1993)
The present analysis studies aspect from a triple perspective: morphological, semantic and syntactic. This division aims at clarifying the concept of aspect, accounting for the traditional dichotomy Imperfect/Preterit tense ...
• #### A TRUST REGION STRATEGY FOR NONLINEAR EQUALITY CONSTRAINED OPTIMIZATION (NONLINEAR PROGRAMMING, SEQUENTIAL QUADRATIC) ﻿

(1985)
Many current algorithms for nonlinear constrained optimization problems determine a search direction by solving a quadratic programming subproblem. The global convergence properties are addressed by using a line search ...
• #### A tunable hydrogel system and pulsatile flow bioreactor for the development of tissue engineered vascular grafts ﻿

(2009)
The prevalence of coronary artery disease combined with a paucity of suitable vessel substitutes act as driving forces for cardiovascular tissue engineering research. In this thesis poly(ethylene glycol) diacrylate (PEGDA) ...
• #### A tunable laser-based mid-infrared source for use in trace gas detection ﻿

(1997)
A new widely tunable mid-infrared (IR) source based on difference-frequency generation (DFG) in Gallium Selenide (GaSe) for use in high-resolution spectroscopy and trace gas detection is described. The characteristics of ...
• #### A two-dimensional model of the Venus ionosphere ﻿

(1988)
The Pioneer Venus observations show a peak in the O$\sb2\sp+$ concentration at $\sim$170 km altitude in the dayside ionosphere of Venus. In this thesis, the 2-dimensional MHD equations are solved in a self-consistent manner, ...
• #### A type-based prototype compiler for telescoping languages ﻿

(2009)
Scientists want to encode their applications in domain languages with high-level operators that reflect the way they conceptualize computations in their domains. Telescoping languages calls for automatically generating ...
• #### A TYPOLOGY OF WOMEN CHARACTERS IN THE GERMAN NATURALIST NOVEL ﻿

(1981)
The subject of this study is the image of woman in late 19th century German fiction. Upon examining a multitude of works produced within this time frame, it was found that the "naturalist" novel, in particular, provided a ...
• #### A unified approach to complex seismic imaging problems ﻿

(1991)
Two current challenges in seismic imaging are to obtain more detailed images of complex structures from reflection data and to constrain the regional structure of the Earth using wide-angle data. These are complex problems ...
• #### A unified approach to mitomycinoids: Application of a novel ene-like reaction ﻿

(1999)
A practical synthesis of the powerful antitumor agents, mitomycin C and FR900482, remains an elusive goal to this date. These substances may be thought to arise from suitably functionalized benzazocinones as retrosynthetic ...
• #### A union in disarray: Romanian nation building under Astra in late-nineteenth-century rural Transylvania and Hungary ﻿

(2002)
Scholarly studies of the nation as a socially constructed community, while accurate, do not explain how individuals in a predominantly agricultural society build and mobilize a national community outside of traditional ...
• #### A universal hidden Markov tree image model ﻿

(1999)
Wavelet-domain hidden Markov models have proven to be useful tools for statistical signal and image processing. The hidden Markov tree (HMT) model captures the key features of the joint density of the wavelet coefficients ...
• #### A Usability and Real World Perspective on Accessible Voting ﻿

(2012)
The HAVA (Help America Vote Act) mandated that all polling places provide privacy and independence to voters. DREs (Direct-Recording Electronic voting systems) have been assumed to be the solution to providing accessible ...
• #### A VARIABLE-METRIC VARIANT OF THE KARMARKAR ALGORITHM FOR LINEAR PROGRAMMING ﻿

(1987)
The most time-consuming part of the Karmarkar algorithm for linear programming is computation of the step direction, which requires the projection of a vector onto the nullspace of a matrix that changes at each iteration. ...