Temporal and spectral nonlinear pulse shaping methods in optical fibers

The combination of the third-order optical nonlinearity with chromatic dispersion in optical fibers offers an extremely rich variety of possibilities for tailoring the temporal and spectral content of a light signal, depending on the regime of dispersion that is used. Here, we review recent progress on the use of third-order nonlinear processes in optical fibers for pulse shaping in the temporal and spectral domains. Various examples of practical significance will be discussed, spanning fields from the generation of specialized temporal waveforms to the generation of ultrashort pulses, and to stable continuum generation.

From art for arts sake to art as means of knowing:a rationale for advancing arts-based methods in research, practice and pedagogy

This paper advances a philosophically informed rationale for the broader, reflexive and practical application of arts-based methods to benefit research, practice and pedagogy. It addresses the complexity and diversity of learning and knowing, foregrounding a cohabitative position and recognition of a plurality of research approaches, tailored and responsive to context. Appreciation of art and aesthetic experience is situated in the everyday, underpinned by multi-layered exemplars of pragmatic visual-arts narrative inquiry undertaken in the third, creative and communications sectors. Discussion considers semi-guided use of arts-based methods as a conduit for topic engagement, reflection and intersubjective agreement; alongside observation and interpretation of organically employed approaches used by participants within daily norms. Techniques span handcrafted (drawing), digital (photography), hybrid (cartooning), performance dimensions (improvised installations) and music (metaphor and structure). The process of creation, the artefact/outcome produced and experiences of consummation are all significant, with specific reflexivity impacts. Exploring methodology and epistemology, both the "doing" and its interpretation are explicated to inform method selection, replication, utility, evaluation and development of cross-media skills literacy. Approaches are found engaging, accessible and empowering, with nuanced capabilities to alter relationships with phenomena, experiences and people. By building a discursive space that reduces barriers; emancipation, interaction, polyphony, letting-go and the progressive unfolding of thoughts are supported, benefiting ways of knowing, narrative (re)construction, sensory perception and capacities to act. This can also present underexplored researcher risks in respect to emotion work, self-disclosure, identity and agenda. The paper therefore elucidates complex, intricate relationships between form and content, the represented and the representation or performance, researcher and participant, and the self and other. This benefits understanding of phenomena including personal experience, sensitive issues, empowerment, identity, transition and liminality. Observations are relevant to qualitative and mixed methods researchers and a multidisciplinary audience, with explicit identification of challenges, opportunities and implications.

Operational Methods in the Environment of a Computer Algebra System

This article presents the principal results of the doctoral thesis “Direct Operational Methods in the Environment of a Computer Algebra System” by Margarita Spiridonova (Institute of mathematics and Informatics, BAS), successfully defended before the Specialised Academic Council for Informatics and Mathematical Modelling on 23 March, 2009.

Algorithmic Methods in Queues and in the Exploration of Point Processes

This is a review of methodology for the algorithmic study of some useful models in point process and queueing theory, as discussed in three lectures at the Summer Institute at Sozopol, Bulgaria. We provide references to sources where the extensive details of this work are found. For future investigation, some open problems and new methodological approaches are proposed.

Comparison of numerical bit error rate estimation methods in 112Gbs QPSK CO-OFDM transmission

We demonstrate an accurate BER estimation method for QPSK CO-OFDM transmission based on the probability density function of the received QPSK symbols. Using a 112Gbs QPSK CO-OFDM transmission as an example, we show that this method offers the most accurate estimate of the system's performance in comparison with other known approaches.

Analysis of carrier phase extraction methods in 112-Gbit/s NRZ-PDM-QPSK coherent transmission system

We present a comparative analysis on three carrier phase extraction approaches, including a one-tap normalized least mean square method, a block-average method, and a Viterbi-Viterbi method, in coherent transmission system considering equalization enhanced phase noise. © OSA 2012.

Az állam szerepe a turizmusban (The role of government in tourism)

Az állam szerepe napjainkban átalakulóban van, ami az egyes gazdasági területeken más és más szabályozórendszer alkalmazását igényli a szakterület sajátosságainak és az iparág igényeinek, nemzetközi környezetének megfelelően. A turizmus azon gazdasági területek közé tartozik, amelynek szerepe az elmúlt időszakban dinamikusan növekedett, többek között jelentős bruttó hazai termék-előállító, munkaigényes jellegéből, valamint jelentős beruházást gerjesztő hatásából adódóan. A turizmus mint üzleti tevékenység nem nélkülözheti az állam szerepét. Számos olyan externália társul hozzá, ami államilag koordinált esetben a fejlődést magasabb pályára állítja, és társadalmilag hatékonyabb szinten valósul meg. Napjainkban az állam szerepének újraértelmezése, feladatainak újbóli átgondolása és a megfelelő súlypontok megtalálása elengedhetetlenül szükséges annak érdekében, hogy a turizmus pozitív hatásai hosszú távon érvényesüljenek. _______________ Nowadays the role of the government is changing, which needs the usage of different regulatory systems regarding the requirements of the industry and the international environment. Tourism belongs to the economics fields which importance are growing very rapidly because of its effects such as GDP contribution effect, workforce effect and investment exciting effect. Tourism as a business activity needs the significant role of the government. Tourism is in association with a lot of externalise, therefore can secure the coordination of the state the development and the efficiency at a higher level. Nowadays the rethinking of the task of the government is needed on the field of tourism in the interest of the enforcement of its positive effects.

A fogyasztói érték és az élmény kontextusa a turisztikai szakirodalomban (The context of consumer value an experience in tourism literature)

Tanulmányában a szerző a szakirodalomban fellelhető főbb fogyasztóiérték- és élménymegközelítéseket és kapcsolatokat mutatja be. A turizmus területére fókuszálva kitér az egyes érték és a hozzá szorosan kapcsolódó élménymegközelítéseken belül található nézetkülönbségekre és azonosságokra. A szerző célja, hogy bemutassa a turizmusszektorban tapasztalt fogyasztóiérték-megközelítések sokféleségét, alátámassza a fogalom tudományos szempontú tisztázatlanságát, valamint korábbi empirikus kutatások alapján összesítse a fogyasztói érték lehetséges dimenzióit a turizmusban. ____ In this paper, the author presents consumer value and experience approaches and connections found in literature. Focusing on the area of tourism she introduces value – experience connections, the differences and accordance among approaches of the experts, and the changes of the content of interpretations from time to time. The author set several targets with her work: introducing the diversity of consumer value approaches in tourism; proving the lack of the precisely and scientifically composed concept of consumer value; and based on former empirical researches summarizing the potential consumer value dimensions in tourism.

Projekttervezési módszerek kihívásai a XXI. században (Challenges of the project planning methods in the 21st century)

Több mint száz éve született meg Henry Gantt (Gantt, 1910) sávos ütemterve, Kelley (Kelley, 1961) és Walker (Walker, 1959) is több mint hatvan éve publikálta kritikus út módszerét. Az ezekre épülő költség- és erőforrás- tervezési módszerek vajon alkalmasak-e a ma kihívásaira? Az olvasó ebben a tanulmányban többéves kutatómunka gyümölcsét láthatja. A kutatás során az egyik legfontosabb cél annak vizsgálata volt, hogy a meglévő projekttervezési eszközök mennyiben felelnek meg a mai projektek kihívásainak; hol és milyen területen van szükség e módszerek továbbfejlesztésére, esetleg meghaladására. Ebben a tanulmányban a szerző olyan módszereket mutat be, amelyek messze túlvezetnek bennünket a projekttervezés eddig elsősorban operatív feladatokra szorítkozó módszereitől, és olyan kérdések megválaszolására fordítja figyelmünket, mint pl. milyen tevékenységeket, projekteket valósítsunk meg; melyeket hagyjuk el vagy ütemezzük be egy későbbi projektbe; hogyan rangsoroljuk, priorizáljuk a projektek megvalósítását, fontosságát? ______ Gantt chart (Gantt, 1910) was born by Henry Gantt more than a hundred years ago. Kelley and Walker published their critical planning method more than a 60 years ago (see i.e. Kelley-Walker, 1959). Can we use methods based on network planning methods for the challenges of 21st century? In this paper the author can see the results of the recent researches. In this study with their colleagues he investigated which project planning methods can be used in challenges of the 21st century and where and how to improve them. In these researches new matrix-based project planning methods are specified, where they can deal not only operative but strategic questions: which subprojects/tasks should be completed, how to treat priorities of completion in case of defining logic planning, how to support not only traditional but agile project management approaches.In this paper he introduces a new matrix-based method, which can be used for ranking project or multi project scenarios with different kinds of target functions. The author shows methods that are used in an expert module. He shows how to integrate this expert module into the traditional PMS system.

The Role of Theme Parks in Tourism

Although the theme park has been a major tourism destination in the United States, little research has been done in this industry. The growing economic significance and competition of the theme park industry ensure that the study of theme parks will emerge as a more popular research topic in the years to come. The authors review related articles and identify potential research topics in the theme park industry.

How effective are selection methods in medical education? : A systematic review

Funded by Health Education England (HEE) Office for Fair Access (OFFA)

Review of dietary assessment methods in public health

This report provides a descriptive summary of tools to measure dietary intake and dietary behaviours - exploring the application, reliability and validity of the various tools.

Grounded Theory methods in child psychotherapy research

This article considers the place of qualitative research in psychoanalysis and child psychotherapy. It discusses why research methodology for many years occupied so small a place in these fields, and examines the cultural and social developments since the 1960s which have changed this situation, giving formal methods of research much greater significance. It reflects on the different pressures to develop formal research methods which arise both from outside the psychoanalytic field, as a condition of its continued professional survival, and from within it, where its main aim is the development of fundamental psychoanalytic knowledge, It suggests that the conduct of mainly quantitative research into treatment outcomes is largely a response to these external pressures, whilst the main benefits to be gained from the development of qualitative research methods, such as Grounded Theory, are in facilitating the knowledge-generating capacities and achievements of child psychotherapists themselves. The paper describes Grounded Theory methods, and explains how they can be valuable in the recognition of hitherto unrecognised meanings and patterns as these are made visible in clinical practice. Finally, it briefly describes five different examples of completed doctoral studies, all of which have added significantly to the knowledge-base of child psychotherapy, and which demonstrate how much can be accomplished using this method of research.