Multiphase flow is associated with concurrent flow of more than one phase (gas-liquid, liquid-solid, or gas-liquid-solid) in a conduit. The simultaneous flow of these phases in a flow line, may initiate a slug flow in the pipeline. Hydrodynamic slug flow is an alternate or irregular flow with surges of liquid slug and gas pocket. This occurs when the velocity difference between the gas flow rate and liquid flow rate is high enough resulting in an unstable hydrodynamic behaviour usually caused by the Kelvin-Helmholtz instability. Active feedback control technology, though found effective for the control of severe slugs, has not been studied for hydrodynamic slug mitigation in the literature. This work extends active feedback control application for mitigating hydrodynamic slug problem to enhance oil production and recovery. Active feedback Proportional-Integral (PI) control strategy based on measurement of pressure at the riser base as controlled variable with topside choking as manipulated variable was investigated through Olga simulation in this project. A control system that uses the topside choke valve to keep the pressure at the riser base at or below the average pressure in the riser slug cycle has been implemented. This has been found to prevent liquid accumulation or blockage of the flow line. OLGA (olga is a commercial software widely tested and used in oil and gas industries) has been used to assess the capability of active feedback control strategy for hydrodynamic slug control and has been found to give useful results and most interestingly the increase in oil production and recovery. The riser slugging was suppressed and the choke valve opening was improved from 5% to 12.65% using riser base pressure as controlled variable and topside choke valve as the manipulated variable for the manual choking when compared to the automatic choking in a stabilised operation, representing an improvement of 7.65% in the valve opening. Secondly, implementing active control at open-loop condition reduced the riser base pressure from 15.3881bara to 13.4016bara.

Composed of a left mold and a right one, an open and close molding mechanism is widely used in various plastic industries. The aim of this study is to design cam-link mechanisms whose right mold motions can rapidly synchronize with their left mold motions so that the mechanisms have higher stiffness for reducing residual vibration. In structural design of a molding mechanism, the device is actuated by a planar cam mechanism. And a set of cam actuated links is synthesized to drive the left mold. Then, another set of links connected to one of the left mold links is used to synchronously actuate the right mold together with the left mold. This study first is to synthesize the B-Spline curves for the left mold motion. Subsequently, the linkage sizes are modified base on the mechanical advantages. Then, the motion curves of the right mold and the cam follower device can be analytically determined. And the rigid body dynamic behavior of the mechanism is analyzed. Finally, the geometry of the cam is analyzed and the size of the cam follower rollers are selected to achieve the longer life time at the working speeds. This research presents eight different design cases to investigate the kinematic and dynamic characteristics of the molding mechanism. As a result, a case with improved kinematic and dynamic performance is selected.

Most bridges in Taiwan are simple beam bridge , and most of them have been used more than twenty years , even some of them are used fifty years.In recent years , there are many floods in Taiwan rivers . There are often high-velocity,flow,and entrainment of a large number of sediment from happening.This situation for the bridge itself and the safety of people cause a great threat , bridge health examination become an important issue after Typhoon Morakot. In this study , we explored modern measurement technique for bridge deformation monitoring , and it can also used bridge health examination. The cross bridge measurement and modeling is focused on the vicinity area around Da-Jia Bridge of Highway 1 based on Angle-Distance monitoring survey, Leveling, close-range photogrammetry, and 3D laser scanning technologies. The 3D point cloud model of bridge is constructed for the purpose of comparing the accuracy between four technologies. Moreover, the discussion and investigation is also conducted for at least three bridges span and two-side of the bridge deformation monitoring. P29 to P25 bridge pier deflection measurements of the monitoring points for each completed total of five point and the deformation monitoring accuracy is analyzed base on four technologies. Finally, development of the technical specification draft for bridge deformation monitoring is to aim the goal of technologically advanced, economical, and safe application in the technology of deformation monitoring of bridges. At present, the draft of technical specification applies only to the measurements of structure, settlement, displacement, and tilt for simple beam-type bridge. The bridge deformation monitoring after the flood season can reflect the degree of deformation or the deformation trend.

Though the Aerospace industry is moving towards small satellites and smaller sensor technologies, sensors used for close-proximity operations are generally cost (and often size and power) prohibitive for University-class satellites. Given the need for low-cost, low-mass solutions for close-proximity relative navigation sensors, this research analyzed the expected errors due to near-field effects using a coarse sun sensor as part of a 6-degree-of-freedom (6-dof) solution. To characterize these near-field effects, a test bed (Characterization Test Apparatus or CTA) was proposed, its design presented, and the design stage uncertainty analysis of the CTA performed. A candidate coarse sun sensor (NorthStarTM) was chosen for testing, and a mathematical model of the sensor’s functionality was derived. Using a Gaussian Least Squares Differential Correction (GLSDC) algorithm, the model parameters were estimated and a comparison between simulated NorthStarTM measurements and model estimates was performed. Results indicate the CTA is capable of resolving the near-field errors. Additionally, this research found no apparent show stoppers for using coarse sun sensors for 6-dof solutions.

The aim of this study was to examine whether and how being committed to a close romantic relationship and gender would affect Turkish young adults&rsquo / death-anxiety. Based on Terror Management Theory (TMT), it was hypothesized that participants who are exposed to separation thoughts from a relationship partner would experience more death&ndash / anxiety than participants who are not exposed to separation thoughts from their relationship partners. In this respect, it was also hypothesized that high commitment to the relationship partner would work as a buffer against death-anxiety and those who have higher commitment to their relationship partners would, therefore, experience less death anxiety than those who have lower commitment to their relationship partners. It was also aimed to investigate whether the effects of commitment to close romantic relationships differ between genders. The effect of neuroticism was also controlled for all participants, so that any difference that is observed between groups would not be due to the effects of neuroticism. One-hundred sixty one participants (age range = 19-38) from Ankara, Istanbul, and Izmir, Turkey were included in this study. Results suggested no significant main effects of experimental manipulation (i.e. experimental group, control group), commitment level (i.e. high, low) or gender (i.e. female, male) on death-anxiety. A significant interaction effect between commitment level and experimental manipulation was found. According to that, in the experimental group (those who were asked to imagine a separation from their relationship partners) participants with high commitment level were found to experience less death&ndash / anxiety than participants with low commitment level. Also, it was revealed that those who have low commitment to their relationship partners experience more death- anxiety when they were asked to imagine a separation from their relationship partners than when they were not asked to imagine such separation. The same increment in death anxiety was not observed in participants who have high commitment to their relationship partners. The strengths, limitations, and implications of the study were discussed in light of related literature.

<p><strong><p>Abstract</p><p>This bachelor thesis deals with the close company rules in chapter 56-57 within the Swedish income tax law (IL). The purpose of this thesis is to analyse the outsider rule in 57:5 IL. If a shareholder or a family member works or have worked actively within the company within the fiscal year or the last five fiscal years then the partner has qualified shares and is to be taxed according to the special closed company rules.</p><p>If an outsider, directly or indirectly, is a significant shareholder within the company, and directly or indirectly, are entitled to dividends then an active partner only has qualified shares if there is special reasons. When making the assessment regard must be made to conditions under the fiscal year or the last five fiscal years. There is special reason not to apply the rule if there are agreements regarding how the profit should be split or cross-ownerships between companies.</p><p>If a taxpayer can show that an outsider own 30 percent of the closed company and has a right to dividends and there is no special reason to why the rule should not be applied then the outsider rule is applicable. If the rule is applicable it means that all the shareholders within the company will be taxed for dividends and capital gain with a 25 percent tax rate.</p></strong></p>

Thesis (M.A. in National Security Affairs)--Naval Postgraduate School, June 2003. / Thesis advisor(s): James A. Russell, Gregory K. Mislick. Includes bibliographical references (p. 67-69). Also available online.

Bakgrund: Bakgrunden till denna studie är att tidigare forskning har visat att det finns många unga individer som kan beskriva känslan av att vara blyg och hur de lever med denna. Tidigare studier har varit inriktade på barn och ungdomar med målet att komma fram till en kategorisering av de unga, och det leder till att denna studie har en annorlunda vinkling av blyghet. Den teoriram som studien utgår ifrån är symbolisk interaktionism och social interaktion med begreppen generaliserande och signifikanta andra samt främre och bakre regioner. Syfte: Följande studie har som syfte att förstå hur barn och ungdomar ser på blyghet. Syftet är även att se hur unga individer hanterar blyghet i sina kamratrelationer under skoltiden. Frågeställningarna som har undersökts är: Hur beskriver barn och ungdomar blyghet?; Vilken betydelse har kamratrelationer för ungas sätt att hantera blyghet?; Vilka föreställningar finns om blyghet i situationer med nära och flyktiga relationer?; Hur upplever unga att blyghet hanteras genom strukturerade miljöer som i klassrummen, och i friare valda umgängesformer som under luncher, raster, innan och efter skolan? Metod: Genom att arbeta med semistrukturerade intervjuer där varje informant ges utrymme till att själv beskriva sina tankar och ord om blyghet i förhållande till kamratrelationer, tydlig-görs att utgångspunkten är en kvalitativ metod. En förståelse av att individer har egna sätt att se på fenomenet finns med under studien och det leder sedan fram till resultatet. Resultat och slutsatser: Resultaten visar att de tillfrågade barnen och ungdomarna hanterar blyghet på olika sätt, då en del väljer att hålla sig undan blyga människor och andra vill hjälpa dem. De har även egna ord på vad blyghet innebär, i och med att de flesta upplever det som ett negativt sinnestillstånd, medan några få informanter kan se det positiva med blyghet. Enligt dessa finns det nämligen fördelar med att som individ inte vilja vara i fokus hela tiden, att förstå andra samtidigt som en försiktighet hindrar den från att vara elak mot andra, och slutligen ser de en positiv aspekt av att blyghet gör att individen inte tjatar, utan i större utsträckning lyssnar. / Background: The background of this study is previous research has shown that there are sev-eral young individuals whom can describe shyness and how to live with it. Previous studies have had a focus on children and youth with the purpose of categorizing them, which leads this study to have a different approach to shyness. The study is based on symbolic interactionism and social interaction using the terms generalized others/significant others along with Front Stage/Back Stage. Aim: This study has an aim to understand how children and youth perceive shyness. The aim is also to see how young individuals handle shyness in friendships during school-hours. The leading questions which have been studied are: How does children and youths describe shyness?; To what degree does friendships affect young individuals ability to handle shyness?; Which conceptions about shyness exists in regards to close and transient relationships?; How does young individuals perceive how shyness is handled in structured environments such as in the classroom and in chosen relations with people such as lunch breaks, time between classes, before, and after school? Methods: By working with semi-structured interviews where each interviewee is freely able to describe their thoughts and words regarding shyness in relation to friendships, it's clarified that the basis of this study is qualitative. An understanding that individuals have their own perspec-tive on the phenomenon is incorporated into the study which leads to the result. Results and conclusions: The result shows that the interviewed children and youths handle shyness in different ways as some choose to keep away from shy individuals while others want to help them. They also have their own words to describe what shyness entitles since most find it to be a negative experience while some interviewees can see something positive with it. According to them there are advantages by not wanting to be in the spotlight, to understand others while caution prevents the person from being mean to them, and finally they find a positive aspect when shyness leads the individual to not badger, and instead listens to a greater extent.

Η μελέτη των διπλών εκλειπτικών συστημάτων παραμένει ένα από τα πιο ενδιαφέροντα ερευνητικά πεδία της αστροφυσικής γιατί παρέχει την πιο ακριβή μέθοδο υπολογισμού των βασικών αστρικών μεγεθών (μαζών, ακτίνων, θερμοκρασιών) αλλά και κάθε μορφής αστρικής δραστηριότητας που αναπτύσσεται (κηλίδες, δίσκοι προαύξησης ύλης, αναπάλσεις) μέσα από τη μακρόχρονη μεταβολή της περιόδου τους. Επιπλέον επιτρέπει τον έλεγχο των θεωριών αστρικής εξέλιξης μέσα από την αλληλεπίδρασή τους αλλά και την πρόβλεψη παρουσίας τρίτων σωμάτων αστρικής ή μη φύσης. Σε αυτήν τη διατριβή μελετάται μία ιδιαίτερη κατηγορία διπλών εκλειπτικών συστημάτων σε επαφή, τα W UMa τα οποία αποτελούνται από αστέρες κύριας ακολουθίας οι οποίοι βρίσκονται σε υπερεπαφή, και χαρακτηρίζονται από τις μικρότερες περιόδους κι άρα από τη μικρότερη στροφορμή. Σκοπός της είναι τόσο η παρατηρησιακή μελέτη και ανάλυση συστημάτων W UMa που παρουσιάζουν ιδιαίτερο ενδιαφέρον όσο και η ανάγκη ανάπτυξης μεθοδολογίας μοντελοποίησης για την εξαγωγή της μέγιστης πληροφορίας και ελέγχου των εξαγόμενων φυσικών παραμέτρων κάτω από την εφαρμογή σύγχρονων στατιστικών μεθόδων. Το πρώτο μέρος της επικεντρώνεται στη σκιαγράφηση του θεωρητικού επιστημονικού πλαισίου περιγραφής των διπλών εκλειπτικών αστρικών συστημάτων σε επαφή. Το Κεφάλαιο1 αναφέρεται στη γεωμετρία των τροχιών και στη φυσική των αστέρων του συστήματος, στην περιγραφή του μοντέλου Roche και στην αλληλεπίδραση των μελών καθώς και στη δυναμική των συστημάτων όπως αυτή εκδηλώνεται από την παρατηρούμενη μεταβολή της περιόδου του. Το Κεφάλαιο 2 αναφέρεται στις φωτομετρικές παρατηρήσεις που έγιναν κατά την διάρκεια της παρούσας διατριβής καθώς και στις αυτοματοποιημένες μεθόδους επεξεργασίας και ανάλυσης των παρατηρησιακών αστρονομικών δεδομένων οι οποίες αναπτύχθηκαν. Το Κεφάλαιο 3 περιγράφει τις σύγχρονες τεχνικές μοντελοποίησης και τα προγράμματα ανάλυσης για τηλύση του αντίστροφου προβλήματος. Το Κεφάλαιο 4 περιγράφει την αναζήτηση, εξόρυξη και αυτόματη ανάλυση δεδομένων από παρατηρησιακές αστρονομικές επισκοπήσεις και την εφαρμογή του κώδικα τεχνητών νευρωνικών δικτύων EBAI. Το δεύτερο μέρος επικεντρώνεται στην αναλυτική μελέτη επιλεγμένων στενών διπλών συστημάτων W UMa με ιδιαίτερο ενδιαφέρον. Σε όλα τα επιλεγμένα συστήματα παρουσιάζεται η φωτομετρική τους μελέτη κάτω από το φως νέων BV RcIc παρατηρήσεων, η μελέτη της περιόδου, το εξαγόμενο μοντέλο σε συνδυασμό με φασματοσκοπικά δεδομένα, ο προσδιορισμός τροχιακών και φυσικών παραμέτρων και η θέση τους σε εξελικτικά διαγράμματα. Επίσης γίνεται η διερεύνηση του προτεινόμενου μοντέλου για μοναδικότητα στο χώρο των λύσεων μέσα από σάρωση με εισαγωγή διαταραχών ή άλλων στατιστικών μεθόδων και ο στατιστικός προσδιορισμός των σφαλμάτων των παραμέτρων. Συγκεκριμένα στο Κεφάλαιο5 παρουσιάζεται το ενοποιημένο μοντέλο του συστήματος TY Boo δύο κηλίδων που ερμηνεύει τη συμπεριφορά του την περίοδο 1969-2011 και τη μελέτη της περιόδου του. Σύμφωνα με αυτό το σύστημα TY Boo ανήκει στην υποκατηγορία W των W UMa με μικρό βαθμό επαφής f = (7.6 ±0.8)% και η μακρόχρονη μελέτη της περιόδου του δείχνει μακροχρόνια μείωση (dP/dt = −3.65x10^−8 d yr^−1 ) και μία περιοδικότητα (P3 = 58.9yrs, A = 0.0254 days)η οποία, χωρίς να αποκλείεται η παρουσία τρίτου σώματος, ερμηνεύεται με ενεργό μαγνητικό κύκλο που προκαλεί την εμφάνιση κηλίδων.Στο Κεφάλαιο 6 παρουσιάζεται για πρώτη φορά η λεπτομερής ανάλυση του συστήματος WUMa, FI Boo το οποίο ταξινομείται στην υποκατηγορία W, με βαθμό επαφής f = (50.15 ±8.10) %, κάτω από την παρουσία τρίτου σώματος το οποίο μπορεί να παίζει σημαντικό ρόλο στη δημιουργία και την εξέλιξή του. Σύμφωνα με το προτεινόμενο μοντέλο προσδιορίζονται οι μάζες Mh =0.40 ± 0.05 Msun , Mc =1.07 ± 0.05 Msun , και οι θερμοκρασίες Th = 5746±33Κ, Tc = 5420±46 Κ των αστέρων-μελών του καθώς και των προγεννητόρων τους (1.71 ±0.10 Msun και 0.63 ± 0.01 Msun , αντίστοιχα) και διερευνάται το εξελικτικό στάδιο του αστέρα με τη μεγαλύτερη μάζα μέσα από ισόχρονες.Στο Κεφάλαιο 7 διερευνάται σε βάθος το σύστημα σε επαφή V1003 Her, το οποίο χαρακτηρίζεται από μεταβολή μικρού πλάτους, με πολλαπλά μοντέλα για τα οποία ελέγχεται η σταθερότητα των με ανεξάρτητες μεθόδους. Το επικρατέστερο από αυτά δείχνει ότι το σύστημα είναι W UMa με βαθμό επαφής f = (36±10) %, με ασυνήθιστα άνισες θερμοκρασίες μεταξύ των αστέρων του 550 Κ, και λόγο μαζών q = 0.373. Η μικρή του κλίση i = 38^o ±1^ο το καθιστά ένα από τα μεγαλύτερης μάζας στην υποκατηγορίας W.Στο Κεφάλαιο 8 εξετάζεται η φύση του διπλού συστήματος HI Dra, η λεπτομερής ανάλυση του οποίου δείχνει ότι είναι W UMa με μικρό βαθμό επαφής f = (24 ± 4) % και διαφορά θερμοκρασίας μεταξύ των αστέρων του 330 Κ. Προτείνονται και διερευνώνται εξονυχιστικά δύο μοντέλα με κηλίδες από τα οποία επικρατέστερο, με ψυχρή κηλίδα πάνω στον μικρότερης μάζας και ψυχρότερο αστέρα- τον τοποθετεί στην υποκατηγορία Α. Προσδιορίζονται οι φυσικές παράμετροι των μελών του (M = 1.72 ± 0.08Msun , Mc = 0.43 ± 0.02 Msun , Rh =1.98 ± 0.03Rsun , Rc = 1.08 ± 0.02 Rsun , Lh = 9.6 ± 0.1 Lsun , Lc = 2.4 ± 0.1 Lsun ) και των προγεννητόρων τους (1.11 ± 0.03 Msun και 2.25 ± 0.07 Msun, αντίστοιχα) και προσεγγίζεται η ηλικία του συστήματος σε 2.4 Gyr .Τέλος στο Κεφάλαιο 8 παρουσιάζονται τα πρώτα αποτελέσματα από τις φωτομετρικές παρατηρήσεις με το τηλεσκόπιο Αρίσταρχος 2.3 m, διπλών εκλειπτικών συστημάτων με ιδιαίτερο ενδιαφέρον που ανακαλύφθηκαν ή παρατηρήθηκαν από την διαστημική αποστολή Kepler με περιόδους περιφοράς < 0.45 d, τα οποία παρουσιάζουν ασυμμετρίες στην καμπύλη φωτός, χρονικές μεταβολές των εκλείψεων των μελών τους ή είναι εν δυνάμει τριπλά συστήματα. Τα πρώτα αποτελέσματα αφορούν τα συστήματα KIC 11246163 και KIC 4563150τα οποία ταξινομούνται ως συστήματα τύπου W UMa, W υποκατηγορίας με πιθανό τριτο συνοδό. / The study of eclipsing binary systems remains one of the most powerful research fields in stellar astrophysics because it provides the primary source of calculating fundamentals properties of stars (masses, radii, temperatures) and every form of stellar activity (spots, accreting discs, pulsations) through photometry and spectroscopy or/and through the study of long-term variability of their period. Additionally it allows testing of stellar structure and evolution theories and the prediction of third body companions of stellar or sub-stellar origin. This thesis is focused on the study of W UMa type eclipsing binaries containing main sequence stars in overcontact configuration with short periods and,therefore the small angular momentum. The aim is both the multiband observational study, analysis and investigation of WUMa systems of particular interest but also the development of modeling methodology in order to extract the maximum information and to determine a detailed assessment of the parameter uncertainties through the application of modern statistical methods. The first part of the Doctoral Thesis outlines the theoretical framework for describing eclipsing binary stars. Chapter 1 refers to the physics and geometry of orbits and components, the description of the Roche model that led to the classification based on equipotential surfaces, the computation of the total radiated flux in the direction of the observer by including all the corrections needed and the description of systems dynamics as manifested by the observed change of their period. Chapter2 presents the photometric observations made during this research and the automated methods of processing and analysis (pipelines) which were developed. Chapter 3 sketches the modern modeling and analysis software techniques for the solution of inverse problem(Differential Corrections, Levenberg-Marquardt, Downhill Simplex, Genetic Algorithms,Heuristic Scanning, Bootstrap resampling, Metropolis –Hasting Markov Chain MonteCarlo), their implementation to programs developed as part of the present thesis and their application to real data. These also represent the methodology of the analyses implemented for the study of the WUMa systems, described in Part 2. Finally, Chapter4 describes the development of a pipeline for the exploration, extraction and automatic analysis of data from astronomical surveys and its application to ASAS database. In the same chapter the first results from the training and validation of the Artificial Neural Network (ANN), EBAI, and the best topology for the ANN are presented.The second part focuses on the detailed study of selected W UMa systems with particular interest. This includes: the new multiband photometric observations, the longterm period variation, the exported model from photometric and spectroscopic data (from the literature), the determination of orbital and physical parameters and their position in evolutionary diagrams, the investigation of the proposed model for uniqueness in the parameter space through heuristic scanning with parameter kicking or other statistical methods- and the statistical determination of the uncertainties of the derived parameters.In Chapter 5, new CCD four-color light curves of TY Boo made on eight nights over2010–2011 were analyzed in comparison with historical light curves obtained from 1969through 2011. The light curves could all be represented by a unique geometry and by wavelength consistent phototometric parameters of a two-spot model on either stellar component. It is confirmed that TY Boo is a shallow W-type contact binary system with a degree of contact factor of f = 7.6 ± 0.8%. A period investigation based on all available data shows a long-term decrease (dP/dt = −3.65 ×10−8 days yr−1 ) and an oscillation (P3 = 58.9 yr, A = 0.0254 days). Without ruling out the presence of a tertiary companion, the weight of evidence points to an active cyclic magnetic activity that causes spot formation rather than an unseen companion. Mass transfer between the components and angular momentum loss are also considered as possible mechanisms.In Chapter 6, a detailed analysis of the interesting W UMa binary FI Boo in view of the spectroscopic signature of a third body through photometry, period variation, and a thorough investigation of solution uniqueness is presented. We obtained new BVRcIc photometric data that, when combined with spectroscopic data, enable us to analyze the system FI Boo and determine its basic orbital and physical properties through PHOEBE,as well as the period variation by studying the times of the minima. This combined approach allows us to study the long-term period changes in the system for the first time in order to investigate the presence of a third body and to check extensively the solution uniqueness and the uncertainties of derived parameters. Our modeling indicates that FIBoo is a W-type moderate (f = 50.15% ± 8.10%) overcontact binary with component masses of Mh = 0.40 ± 0.05 M and Mc =1.07 ± 0.05 M , temperatures of Th = 5746 ±33 K and Tc = 5420 ± 56 K, and a third body, which may play an important role in the formation and evolution. The results were tested by heuristic scanning and parameter kicking to provide the consistent and reliable set of parameters that was used to obtain the initial masses of the progenitors (1.71 ± 0.10 M and 0.63 ± 0.01 M , respectively). We also investigated the evolutionary status of massive components with several sets of widely used isochrones.In Chapter 7, an extensive analysis of the low amplitude, contact binary V1003 Her is presented, based on the new VRc Ic , CCD photometric light curves in combination with published radial velocity (RV) curves. We investigate the stable configurations for the system with two independent methods and modeling tools: PHOEBE, ROCHE, via heuristic scanning and genetic algorithms, although the very low inclination of the system can place limitations. All methods indicate that V1003 Her is most likely in overcontact state with unequal components with temperature difference of 550 K, a mass ratio of q= 0.373 and a contact degree of 36 ± 10 %. As it is viewed at the very low inclination of i ∼ 38^◦ ± 1^◦ , if its configuration is confirmed, it will be among the most massive W-subtype of W UMa systems. This conclusion is also supported by other published models.However, in order to conclude reliable physical properties of the system, the high-precise based-ground photometry (or satellite photometry) and spectroscopic follow-up of V1003Her is required.In Chapter 8, a detailed investigation of the low-amplitude contact binary HI Dra is presented, based on the new VRc Ic CCD photometric light curves (LCs) combined with published radial velocity (RV) curves. Our completely covered LCs were analyzed using PHOEBE and revealed that HI Dra is an overcontact binary with low fill-out factor f = 24 ± 4 (%) and temperature difference between the components of 330 K.Two spotted models are proposed to explain the LC symmetry, between which the A subtype of W UMa type eclipsing systems, with a cool spot on the less massive and cooler component, proves to be more plausible on evolutionary grounds. The results and stability of the solutions were explored by heuristic scan and parameter perturbation to provide a consistent and reliable set of parameters and their errors. Our photometric modeling and RV curve solution give the following absolute parameters of the hot and cool components, respectively: Mh = 1.72 ± 0.08 Msun and Mc = 0.43 ± 0.02 Msun , Rh =1.98 ± 0.03 Rsun and Rc = 1.08 ± 0.02 Rsun , and Lh = 9.6 ± 0.1 Lsun and Lc = 2.4 ± 0.1Lsun . Based on these results the initial masses of the progenitors (1.11 ± 0.03 Msun and2.25 ± 0.07 Msun , respectively) and a rough estimate of the age of the system of 2.4 Gyr are discussed.Finally, in Chapter 9, our first results from ground based follow up photometric observation of interesting eclipsing binary systems (EBs) from Kepler field are presented.The program was launched in 2013 with the 2.3 m Aristarchos telescope at Helmos Observatory, Greece including eclipsing binary systems with periods < 0.45d and Kp (mag)=12.6-16 mag. The included targets in this program show light curve asymmetries,Eclipse Timings Variation or they are third body candidates. Modern analysis techniques such as heuristic scanning with parameter perturbation and genetic algorithm(PIKAIA), enable to reveal and optimize the astrophysical parameters of selected EBs.The results from BVRI photometry for the third body candidates, WUMa eclipsing binary systems of W-subtype, KIC11246163 and KIC4563150, are presented for the first time, as well as conclusions derived so far.

Vid nedläggning av verksamheter har man i tidigare studier stött på det oväntade fenomenet close-down effect, att anställdas produktivitet ökar. Belöningar kan inverka på anställdas prestation då motivationen, enligt balansteorin, ligger i strävan efter jämvikt mellan belöning och arbetsinsats. Syftet med denna studie är att undersöka belöningars betydelse för anställdas arbetsattityder under nedläggningsprocessen, samt att undersöka om beslutet om nedläggning upplevs som ett brott mot det psykologiska kontraktet. En enkätundersökning och en prestationsbedömning genomfördes bland 275 medarbetare på ett tillverkningsföretag. Studiens resultat indikerar att ju högre anställdas förväntan om belöning är, desto högre är deras tillit till arbetsgivaren. En förklaring till close-down effect kan vara att det psykologiska kontraktet faktiskt kvarstod under nedläggningsperioden. Begränsningen med studien är att den enbart fokuserar på belöningars betydelse. Ytterligare faktorer behöver studeras för att tydliggöra bilden av vad som påverkar de anställdas engagemang vid nedläggningar av verksamheter.