Some aspects of cylindrical solutions in Brans-Dicke gravity

Several points regarding cylindrical Brans-Dicke geometries are studied. The issue of particle trajectories for the vacuum cylindrical solution is revisited. The possible particular nature of a global string metric is analysed. The general form of the junction conditions for matching cylindrical solutions within this theory is written down, and the relation with the general relativity limit is discussed.Comment: 7 page

An approach for generating different types of gray codes

Given a certain Gray code consisting of 2n codewords, it is possible to generate from it n! 2n codes by permuting and/or complementing the bits in all the codewords in the same manner. The codes obtained this way are all defined to be of the same type. An approach for converting the standard Gray code (known as the reflected code) into other Gray codes of different types is presented in this paper. A systematic way of generating, for example, all types of Gray codes consisting of 16 codewords is given

Self-Certified Public Key Cryptographic Methodologies for Resource-Constrained Wireless Sensor Networks

As sensor networks become one of the key technologies to realize ubiquitous computing, security remains a growing concern. Although a wealth of key-generation methods have been developed during the past few decades, they cannot be directly applied to sensor network environments. The resource-constrained characteristics of sensor nodes, the ad-hoc nature of their deployment, and the vulnerability of wireless media pose a need for unique solutions. A fundamental requisite for achieving security is the ability to provide for data con…dential- ity and node authentication. However, the scarce resources of sensor networks have rendered the direct applicability of existing public key cryptography (PKC) methodologies impractical. Elliptic Curve Cryptography (ECC) has emerged as a suitable public key cryptographic foun- dation for constrained environments, providing strong security for relatively small key sizes. This work focuses on the clear need for resilient security solutions in wireless sensor networks (WSNs) by introducing e¢ cient PKC methodologies, explicitly designed to accommodate the distinctive attributes of resource-constrained sensor networks. Primary contributions pertain to the introduction of light-weight cryptographic arithmetic operations, and the revision of self- certi…cation (consolidated authentication and key-generation). Moreover, a low-delay group key generation methodology is devised and a denial of service mitigation scheme is introduced. The light-weight cryptographic methods developed pertain to a system-level e¢ cient utilization of the Montgomery procedure and e¢ cient calculations of modular multiplicative inverses. With respect to the latter, computational complexity has been reduced from O(m) to O(logm), with little additional memory cost. Complementing the theoretical contributions, practical computation o¤-loading protocols have been developed along with a group key establishment scheme. Implementation on state-of- the-art sensor node platforms has yielded a comprehensive key establishment process obtained in approximately 50 ns, while consuming less than 25 mJ. These exciting results help demonstrate the technology developed and ensure its impact on next-generation sensor networks

Cavity ring-up spectroscopy for ultrafast sensing with optical microresonators

Spectroscopy of whispering-gallery mode (WGM) microresonators has become a powerful scientific tool, enabling detection of single viruses, nanoparticles, and even single molecules. Yet the demonstrated timescale of these schemes has been limited so far to milliseconds or more. Here we introduce a novel scheme that is orders of magnitude faster, capable of capturing complete spectral snapshots of WGM resonances at nanosecond timescales: cavity ring-up spectroscopy (CRUS). Based on sharply-rising detuned probe pulses, CRUS combines the sensitivity of heterodyne measurements with the highest possible, transform-limited acquisition rate. As a demonstration we capture spectra of microtoroid resonators at time intervals as short as 16 ns, directly monitoring sub-microsecond dynamics of their optomechanical vibrations, thermorefractive response and Kerr nonlinearity. CRUS holds promise for the study of fast biological processes such as enzyme kinetics, protein folding and light harvesting, with applications in other fields such as cavity QED and pulsed optomechanics.Comment: 6 pages, 4 figure

Alien Registration- Arazi, Jacob C. (Portland, Cumberland County)

https://digitalmaine.com/alien_docs/31744/thumbnail.jp

El test de una repetición máxima incrementa los índices séricos referentes a daño y dolor muscular en varones entrenados y no entrenados

Introducción: El objetivo de este estudio fue examinar el efecto del test de una repetición máxima sobre el daño y el dolor muscular en hombres entrenados y no entrenados. Métodos: Participaron en el estudio 10 hombres entrenados (E) y 10 no entrenados (NE). Los sujetos realizaron un test de una repetición máxima (1RM) en el ejercicio de sentadilla, y se valoró la actividad de la creatincinasa (CK), la concentración de la proteína C reactiva (PCR) y el dolor muscular (cuádriceps e isquiotibiales) al inicio y a las 24, 48 y 72 horas posteriores al test 1RM. Resultados: Se observaron incrementos significativos de la actividad de la CK y el dolor muscular a las 24, 48 y 72 horas posteriores al test 1RM, así como diferencias significativas entre los sujetos entrenados y los no entrenados (p < 0,05). En las concentraciones de PCR, ambos grupos mostraron incrementos significativos en el descanso, a las 24, 48 y 72 horas posteriores al test 1RM, y a las 72 horas en comparación con las 24 horas (p < 0,05). No se detectaron diferencias significativas de la concentración de la PCR (p > 0,05) entre los dos grupos. Conclusión: En conclusión, el test 1RM en el ejercicio de sentadilla (alta intensidad y bajo volumen) incrementa la actividad de la CK, la concentración de la PCR en el plasma y el dolor muscular en sujetos entrenados y no entrenados. Puede observarse que el test 1RM puede inducir daño muscular, lo que significaría un factor negativo tanto para los deportistas como para el resto de individuos, puesto que el dolor muscular se asocia a una disminución del rendimiento. © 2012 Consell Català de l’Esport. Generalitat de Catalunya. Publicado por Elsevier España, S.L. Todos los derechos reservados

Selected piano works by Verdina Shlonsky: analysis and performance guide

This dissertation presents an examination of the evolution of compositional style of Verdina Shlonsky, based on the analysis of selected piano compositions written in different periods of her life. The work examines the issues of defining Shlonsky’s style with regard to her philosophy, expressed in her numerous essays, concerning with the centrality of content. The central question of the evolution of Verdina Shlonsky’s style is addressed by identifying and listing its key characteristics, and tracing them in the three analyzed compositions, representing three different stages of her life. Shlonsky’s biography is compiled with a special focus on her musical development, and musical and non-musical influences to which she was exposed. Detailed formal and motivic analyses of the selected piano works uncover the formative elements of Shlonsky’s style. Each detailed analysis includes key information on the background of the composition, followed by performance guides addressing performance issues, and editorial sections comparing the Israel Music Institute (IMI) printed editions with the manuscripts. Based on Shlonsky’s written statements, describing her compositional esthetics, and on the analyses of the selected works, my dissertation posits that Shlonsky’s music is polystylistic, deliberately using of a variety of styles as expressive tools, and as ways to create continuity of tradition through dialogue with other composers from the past and present. My analyses also suggest that Shlonsky’s piano music from different periods share similar characteristics of style, presented in different proportions and contexts. The main purposes of this dissertation are to define Shlonsky’s compositional style and its evolution; to help performers to approach this unknown repertoire; to assist scholars in future research of Shlonsky’s legacy; and to disseminate knowledge about Verdina Shlonsky’s life and music to a wider audience