Rational harmonic mode-locking (RHML) fiber lasers generating picoseconds pulsewidth at high-repetition-rate have emerged as a key component for the high-bit-rate optical time-division multiplexing (OTDM) communication system. In this research, we have discovered higher order RHML semiconductor optical amplifier fiber laser (SOAFL) has the degradation on mode-locking capacity, and an output pulse-train with un-equalized peak amplitudes. Therefore, the main focus of the dissertation is focused on the pulse quality analysis and improvement of RHML-SOAFL via optical pulse injection. First, we observed the degradation on mode-locked mechanism of the dark-optical-comb injection mode-locked semiconductor optical amplifier fiber laser (SOAFL) at RHML order increases to >8. Such a less pronounced RHML mechanism at higher orders is mainly attributed to the weak mode-locking strength at high RHML orders as compared to continuous-wave (CW) lasing mechanism, which has been quantified by reduction of spectral linewidth and pulse-shortening force, and the ratio of DC/pulse amplitude enhancement for discriminating 1st to 20th-order RHML capability. To overcome the un-equalized RHML peak intensity, optical injection induced gain modulation of a SOA are demonstrated to equalize the peak intensity of 5-GHz and 40-GHz RHML-SOAFL by using 1-GHz inverse-optical-pulse and a reshaped 10-GHz gain-switching FPLD pulse injection, respectively. The optical injection mode-locking models are constructed to simulate the compensation of uneven amplitudes between adjacent RHML pulse peaks before and after pulse-amplitude equalization. The optimized RHML pulse exhibits a signal-to-noise suppression ratio of 45-dB, and the clock amplitude jitter below the threshold limitation of 10%. On the other hand, to avoid the mode-locked degradation on RHML, a 2nd-order fractional Talbot effect induced frequency-doubling of 10-GHz optical pulse-train is demonstrated to backward inject a SOAFL for 40-GHz RHML. In comparison with the SOAFL pulse-train repeated at 40-GHz generated by the 4th-order purely RHML process, the optimized 2nd-order fractional Talbot effect in combination with the 2nd-order RHML mechanism significantly enhances the modulation-depth of RHML, thus improving the on/off extinction ratio of the 40-GHz SOAFL pulse-train. Such a new scheme also provides a more stable 40-GHz RHML pulse-train from the SOAFL with its timing jitter reduce. Finally, we established a SHG-FROG to distinguish linear and nonlinear chirp of 10-GHz soliton HML-SOAFL, and further extracted intra-cavity linear dispersion via simulation of Schrodinger equation. After the procedure, the linear chirp almost dominates chirp characteristics for optical pulse injection HML-SOAFL system.

This paper is concerned with the problem of computing theapproximate D-optimal design for polynomial regression with weight function w(x)>0 on the design interval I=[m_0-a,m_0+a]. It is shown that if w'(x)/w(x) is a rational function on I and a is close to zero, then the problem of constructing D-optimal designs can be transformed into a differential equation problem leading us to a certain matrix including a finite number of auxiliary unknown constants, which can be approximated by a Taylor expansion. We provide a recursive algorithm to compute Taylor expansion of these constants. Moreover, the D-optimal interior support points are the zeros of a polynomial which has coefficients that can be computed from a linear system.

In our study Fq denotes the finite field with q elements. It is interesting to construct curves of given genus over Fq with many Fq -rational points. Drinfeld modular curves can be used to construct that kind of curves over Fq . In this study we will use reductions of the Drinfeld modular curves X_{0} (n) to obtain curves over finite fields with many rational points. The main idea is to divide the Drinfeld modular curves by an Atkin-Lehner involution which has many fixed points to obtain a quotient with a better #{rational points} /genus ratio. If we divide the Drinfeld modular curve X_{0} (n) by an involution W, then the number of rational points of the quotient curve WX_{0} (n) is not less than half of the original number. On the other hand, if this involution has many fixed points, then by the Hurwitz-Genus formula the genus of the curve WX_{0} (n) is much less than half of the g (X_{0}(n)).

The basic planar cam mechanisms and link mechanisms are widely used in industrial automatic machines. In determining the design method and design procedure for the cam-link mechanism, the basic kinematic synthesis and motion curve generation method require effective design procedure and optimization method to determine the kinematic structure of the mechanism and its kinematic performance clearly. In order to determine the result of the multi-objective optimization problem for the cam-link mechanism, the genetic algorithm is defined as the problem solver and begins this dissertation. By considering the influences of the parameters in the evolving procedure and by defining the conditions of the parameters and variables properly, the best solutions of the multi-objective optimization problem can then be solved successfully. By comparing the curves for the motion synthesis of the cam-link mechanism, the existing motion functions with their kinematic characteristics used in cam mechanisms are introduced and the rational B-spline motion function is proposed. By using the genetic algorithm to approximate the motion curves that is combined with trigonometric functions, the flexibility of the rational B-spline is demonstrated. Furthermore, to minimize different kinematic characteristics of the single-objective minimization problems, these problems are also searched by using rational B-splines with genetic algorithm for having better results. For synthesizing different structures of cam-link mechanisms, first of all is to derive the kinematics of the two planar link mechanisms and four planar cam mechanisms and then the genetic algorithm is used here to find out the minimal cam dimension with the limits of the motion curves, the pressure angles, and the radius of curvatures. Then, the kinematic synthesis problem of the function generation slider-crank mechanisms as the slider starts at the toggle position is discussed. Through the analysis finds out that when using the traditional motion functions with acceleration continuity to synthesize the slider motion, the angular acceleration of the crank cannot be continuous. To achieve the acceleration continuity of the crank motion, the curve that contains the fourth derivatives of the displacement with respect to time are set to be zeros can fulfill the continuity requirement. Then using the structural synthesis design procedure, by following the input and output relations of the link mechanisms and cam mechanisms with design constraints to select the proper structures of the mechanisms. To apply the cam-link mechanism in real application, a machine containing a slider-crank mechanism as toggle mechanism is introduced. Through the design constraints of space and motion limits to find out the possible mechanism structure and define the dimensions and then analyze the kinematics and kinetostatics of the machine. By using the genetic algorithm to solve the multi-objective optimization problem, the parameters of the rational B-spline are adjusted to have optimal kinematics and minimal kinetostatics to reduce the contact stress and to improve the fatigue life of the cam follower. Due to the existing problem of the slider-crank mechanism that contains discontinuous acceleration at the toggle position, to prove the correctness of the theoretical results, the experimental tests are measured and verified with the theoretical results in high similarity. The results show that when the slider motion curves begin at the toggle position with boundary motion constraints up to fourth or more than fourth derivatives of the displacement with respect to time that are set to be zeros, the angular accelerations of the cranks are continuous. In summary, this dissertation provides suggestions of the kinematic characteristics for the designer to design cam-link mechanisms that contain a slider-crank mechanism as the toggle mechanism and design methods for the synthesis, analysis and experimental test of the simple function generation cam-link mechanism.

<p>University of Växjö, School of Social Sciences</p><p>Course: PO 5363, Political Science, G3</p><p>Title: the Role of the USA’s and Great Britain in the Coup d'Etat, Iran 1953</p><p>Author: Ashkan Panahirad</p><p>Supervisor: Lennart Bergfeldt</p><p>The purpose of this study is to examine Great Britain’s and US’ motives and action alternatives in regards to the Coup d'état against the iranian regime under Mossadegh in 1953.</p><p>The method used is motive analysis (investigates the actors motives). The theories used are Rational actors model and Governmental politics. Rational actor model allows states to choose among a set of alternatives displayed in a particular situation in order to achieve their goals. Governmental politics explains what happens in states as a result of bargaining games between important actors in the government.</p><p>Analysis from the rational actor model shows that the motives behind the Coup d'état were oil, economical reasons, Iran and communism. Coup d'état was the most rational action for them to achieve their goals. Governmental politics reveal the shifting of policies from one administration to another. While Clement Attlee’s government and Harry Truman’s administration where more moderate, Winston Churchill’s and Eisenhower’s where more eager to replace Mossadegh, which finally lead to a Coup d'état</p>

Werden Softwaresysteme auf Basis eines komponentenorientierten Architekturparadigmas entwickelt, stellt sich die Frage, welches Vorgehensmodell zur Projektabwicklung herangezogen werden kann. In der Literatur werden unterschiedliche Vorgehensmodelle zur komponentenorientierten Softwareentwicklung vorgeschlagen. Aus diesen werden in der vorliegenden Untersuchung vier Modelle ausgewählt: Catalysis, Perspective, Rational Unified Process 2002 und V-Modell ’97. Die ausgewählten Vorgehensmodelle werden auf Basis eines allgemeinen Rahmens beschrieben und verglichen. Dabei werden die Aspekte Terminologie, Klassifizierung, Komponentenbegriff, Abdeckung des Lebenszyklus einer Komponente, Abdeckung der Tätigkeitsbereiche, Prozessarchitektur, Prozesssteuerung, Rollenabdeckung und Adaption untersucht. Komponentenorientierte Vorgehensmodelle sind sowohl Weiterentwicklungen bekannter konventioneller Vorgehensmodelle als auch ausschließlich auf die komponentenorientierte Entwicklung ausgerichtet. Obwohl die ausgewählten Vorgehensmodelle speziell auf eine komponentenorientierte Entwicklung ausgerichtet sind, zeigt sich, dass wesentliche Lebenszyklen einer Komponente nur rudimentär behandelt werden. Eine Ausnahme bildet hier Catalysis.

This thesis analyzes the optimal strategies of rational agents in incomplete financial markets. The incompleteness may arise from the stochastic volatility of stock prices, in which case we study the optimal pricing and hedging strategies of an option trader. We introduce a new concept that we call the relative indifference price, which is the price at which a trader is indifferent to trade in an additional option, given that he is currently holding and dynamically hedging a portfolio of options. We find that the appropriate volatility risk premium depends on the trader's risk aversion coeffcient and his portfolio position before selling or buying the additional option. More generally, the incompleteness of the market may arise from both the drift and volatility of the stock being driven by a correlated factor. In this setting, we study the optimal consumption and investment policies of CARA, conservative CRRA and aggressive CRRA agents. In particular, we provide interpretations of the non-myopic investment in terms of martingale measures and the risk monitoring strategy of a path-dependent option. / text

Fractions are an essential skill for students to master, and one students struggling in mathematics face particular difficulty with (National Mathematics Advisory Panel, 2008; Mazzocco & Devlin, 2008). This study employed the multi-probe multiple baseline design to examine the effectiveness of the concrete-representational-abstract (CRA) approach and explicit teaching practices to teach fraction equivalence to students struggling in mathematics. The study was conducted across four students, and replicated simultaneously across four more. The CRA approach included concrete aids such as fraction circles and fraction strips, representations such as pictures of fraction circles and polygons, and algorithms. Explicit teaching involved following a model-lead-test sequence and included an advanced organizer, corrective feedback and cumulative reviews. Results of this study indicated that the intervention program was effective to improve students‟ performances in fraction equivalence tasks. In particular, the use of vii representations was seen to impact performance and concrete aids alone may not be sufficient to improve performance. With regards types of representational and concrete aids employed, results of this study tended to favor the use of linear versus circular aids. Results indicated that students whose performances tend to vary may not benefit to the same extent as those who have stable profiles. Students who demonstrate variable profiles may require additional practice to master skills being taught. This study also examined transfer of skills to word problems and, results demonstrated that the CRA and explicit teaching approaches were beneficial in helping aiding transfer. Several aspects of the program may have contributed to aiding transfer including, minimal exposure to word problems during intervention, drawing connections between representations and abstract information, and incorporating the fair sharing understanding or quotient interpretation of fractions. This program concluded that students were able to maintain performances over time, and that representations in particular appeared to aid conceptual understanding and promote maintenance of skills. / text

The SHIRA method of Mehrmann and Watkins belongs among the structure preserving Krylov subspace methods for solving skew-Hamiltonian eigenvalue problems. It can also be applied to Hamiltonian eigenproblems by considering a suitable transformation. Structure induced shift-and-invert techniques are employed to steer the algorithm towards the interesting region of the spectrum. However, the shift cannot be altered in the middle of the computation without discarding the information that has been accumulated so far. This paper shows how SHIRA can be combined with ideas from Ruhe's Rational Krylov algorithm to yield a method that permits an adjustment of shift after every step of the computation, adding greatly to the flexibility of the algorithm. We call this new method rational SHIRA. A numerical example is presented to demonstrate its efficiency.

Norint nustatyti, ar žemė naudojama racionaliai ir tikslingai, vykdoma žemės naudojimo valstybinė kontrolė. Žemės naudojimo valstybine kontrole siekiama užtikrinti, kad valdant ir naudojant žemę, būtų laikomasi Lietuvos Respublikos žemės įstatymo bei kitų įstatymų, kurie susiję su žemės naudojimo priežiūra. Siekiant užtikrinti tinkamą žemės naudojimą, tenka išspręsti nemažai įvairių problemų. Tyrimas atliktas siekiant nustatyti žemės naudojimo valstybinės kontrolės darbų organizavimo problemas, trukdančias pasiekti efektyvų kontrolės vykdymą. Tyrimo metu buvo išanalizuoti žemės naudojimą ir valstybinės kontrolės vykdymą reglamentuojantys teisės aktai, Nacionalinės žemės tarnybos prie Žemės ūkio ministerijos ir Marijampolės apskrities viršininko administracijos Žemės tvarkymo departamento kontrolės vykdymo veiklos ataskaitos. Kylančios problemos vykdant žemės naudojimo valstybinę kontrolę Marijampolės apskrityje nustatytos išanalizavus teisės aktus, jų praktinį taikymą ir kontrolės vykdymo veiklos ataskaitas. Tyrimo metu panaudoti literatūros šaltinių analizės, alternatyvų paieškos, lyginamosios ir vertinamosios analizės ir loginio mąstymo metodai. Nustatyta, kad apskričių viršininkų administracijos vykdoma žemės naudojimo valstybinė kontrolė nėra pakankamai efektyvi ir neskatina taupiai naudoti žemę. Tai paaiškintina pareigūnų kompetencijos trūkumu ir nesureguliuotomis jų funkcijomis – vykdoma kita veikla su kontrole nesusijusiose srityse. Baigiantis žemės reformos darbams... [toliau žr. visą tekstą] / In order to determine whether the land is used rationally and purposefully, state control of land use is performed. By the state control of land use one strives to ensure that while managing and using land, the land law and other laws of the Republic of Lithuania related to land use care are obeyed. In order to ensure the appropriate use of land, one has to solve many different problems. The research was carried out in order to find out the problems of state control of land use that prevent from effective control implementation. During the research one analyzed the use of land and legal acts that regulate state control implementation and control implementation work reports of National Land Service under the Ministry of Agriculture and Marijampole county governor’s administration Land Managing Department. The problems that rise while implementing state control of land use in the county of Marijampole were determined by analyzing legal acts, their practical application and work reports of control implementation. During the research one used the analysis of literature sources, alternative search, comparative and evaluation analyses and methods of logical thinking. It was determined that state control of land use that is performed by county governor’s administration is not quite effective and does not encourage using land economically. This can be explained by the lack of competence of officials and their unadjusted functions, i.e. work is performed in other spheres that are not... [to full text]