Design of bent photonic crystal fiber supporting a single polarization

In this work, it is shown that the differential loss between the TE- and TM-polarized fundamental modes in a highly birefringent photonic crystal fiber (PCF) can be enhanced by bending the fiber. As a result, a design approach for single-mode single-polarization operation has been developed and is discussed. A rigorous full-vectorial H-field-based finite element approach, which includes the conformal transformation and the perfectly matched layer, is used to determine the single-polarization properties of such a highly birefringent PCF by exploiting its differential bending losses

The Nature and Nurture of Sports Performance, Blog 4

Student blog posts from the Great VCU Bike Race Book

PENGARUH LINGKUNGAN KOROSIF TERHADAP LAJU KOROSI PADA PIPA MINYAK DAN GAS

Metal join with weld system use often. In weldment, have save cost, relatively fast work, more light, and variety construct. Weldment have weakness is appear of strain that big cause of differences microstructur on weld zone that metal strength down and cause residual stress, and crack\ud cause weldment.\ud The point of this experience worked is want to know influence of corrosive environment that give at corrosion rate in experiment specimen. And to know forms of exposure corrosion that happen from rate corrosion that result. Then to know micro corrosion that happen in specimen that weld (weld metal, heat affected zone, and base metal). Endly can be recommendation in coating process or corrosion resistant plant because this experiment is diagnose corrosion attack that susceptible in speciment.\ud In this experiment, have experiment methode, that each specimens group exposed in environment that digerences is NaCl 10%, H 2 SO 4 10%, and moist environtment, until hour 168.\ud Then test measure rate corrosion, then test micro corrosion dan macro corrosion that happen as influence environments its in speciment IRON API5L-X52 that weld.\ud The results, forms of corrosion that happen on specimen is in moist environment is uniform corrosion that thin (corrosion rate = 0), on expose environment NaCl 10% liquid is uniform corrosion that thick and pitting corrosion (corrosion rate = 2,036 Mpy), then on expose environment\ud H2 SO 4 10% is happen uniform corrosion and pitting corrosion that more thick (corrosion rate = 53,041 Mpy).\ud Form of micro corrosion that happen is selective leaching corrosion (in Base Metal, Weld Metal, and Heat Affected Zone). Zone that more corrosion attack is HAZ (10,797 %) as result thermal strain from weld thermal influence, then BM zone (8,978 %) result oxidation on exposure cause lost of shield elements and on corrosion resitant reduce, then WM zone (5,94 %) is influence of weld process, and because chemistry property that more better in shield of corrosion and compensation from residual stress

BANGLADESH-EU DEVELOPMENT RELATIONSHIP: MAJOR FEATURES AND EMERGING ISSUES

The paper looks at the current status of Bangladesh-EU relationship, identifies the salient features of the new Cooperation Agreement and looks at some of the important emerging challenges in the context of the evolving Bangladesh-EU relationship. The paper also focuses on the trends and structure of aid from EU to Bangladesh over the past years and Bangladesh - EU trade relations.WTO, Trade, Globalisation, Cooperation

Voices: Silences and Sexuality in 19th-Century Women's Slave Narratives

In my paper, I look at the connections between silences and sexuality in 19th-century women's slave narratives, focusing on Mary Prince's The History of Mary Prince: A West Indian Slave, Related by Herself and Harriet Jacobs's Incidents in the Life of a Slave Girl. The silences in these narratives were enforced by notions of chastity at the time, as well as the immediate danger posed against Prince and Jacobs. While sexual labor was very much a part of both British and American slavery, instances of sexual abuse in women's slave narratives were encoded in the language within women's slave narratives. It is these encoded scenes that I analyze in my senior thesis, examining the strategies used by both Prince and Jacobs to convey instances of sexual abuse experienced by themselves and other enslaved people. I aim to build a theory as to how these instances were communicated in each narrative, as well as look at similarities in how both texts approached the issue.No embargoAcademic Major: Englis

Frame- and Metric-like Higher-Spin Fermions

Conventional descriptions of higher-spin fermionic gauge fields appear in two varieties: the Aragone-Deser-Vasiliev frame-like formulation and the Fang-Fronsdal metric-like formulation. We review, clarify and elaborate on some essential features of these two. For frame-like free fermions in Anti-de Sitter space, one can present a gauge-invariant Lagrangian description such that the constraints on the field and the gauge parameters mimic their flat-space counterparts. This simplifies the explicit demonstration of the equivalence of the two formulations at the free level. We comment on the subtleties that may arise in an interacting theory.Comment: 19 pages, published in the special issue "Higher Spin Gauge Theories" of Univers

Higher Spin Theory - Part I

These notes comprise a part of the introductory lectures on Higher Spin Theory presented in the Eighth Modave Summer School in Mathematical Physics. We construct free higher-spin theories and turn on interactions to find that inconsistencies show up in general. Interacting massless fields in flat space are in tension with gauge invariance and this leads to various no-go theorems. While massive fields exhibit superluminal propagation, appropriate non-minimal terms may cure such pathologies as they do in String Theory--a fact that we demonstrate. Given that any interacting massive higher-spin particle is described by an effective field theory, we compute a model independent upper bound on the ultraviolet cutoff in the case of electromagnetic coupling in flat space and discuss its implications. Finally, we consider various possibilities of evading the no-go theorems for massless fields, among which Vasiliev's higher-spin gauge theory is one. We employ the BRST-antifield method for a simple but non-trivial gauge system in flat space to find a non-abelian cubic coupling and to explore its higher-order consistency.Comment: 33 pages, references added, to appear in Proceedings of Scienc