Recent advances in optical metasurfaces for polarization detection and engineered polarization profiles

Like amplitude, phase and frequency, polarization is one of the fundamental properties of light, which can be used to record, process and store information. Optical metasurfaces are ultrathin inhomogeneous media with planar nanostructures that can manipulate the optical properties of light at the subwavelength scale, which have become a current subject of intense research due to the desirable control of light propagation. The unprecedented capability of optical metasurfaces in the manipulation of the light’s polarization at subwavelength resolution has provided an unusual approach for polarization detection and arbitrary manipulation of polarization profiles. A compact metasurface platform has been demonstrated to detect polarization information of a light beam and to arbitrarily engineer a polarization profile that is very difficult or impossible to realize with conventional optical elements. This review will focus on the recent progress on ultrathin metasurface devices for polarization detection and realization of customized polarization profiles. Optical metasurfaces have provided new opportunities for polarization detection and manipulation, which can facilitate real-world deployment of polarization-related devices and systems in various research fields, including sensing, imaging, encryption, optical communications, quantum science, and fundamental physics

The 1994 Silver Anniversary of APOLLO 11: From the Moon to the Stars

This report summarizes the technology transfer, advanced studies, and research and technology efforts in progress at Marshall Space Flight Center (MSFC) in 1994

Conference on Binary Optics: An Opportunity for Technical Exchange

The papers herein were presented at the Conference on Binary Optics held in Huntsville, AL, February 23-25, 1993. The papers were presented according to subject as follows: modeling and design, fabrication, and applications. Invited papers and tutorial viewgraphs presented on these subjects are included

Abstracts to be Presented at the 2016 Supercomputing Conference

No abstract availabl

GENDER PERFORMANCE DISCOURSE ON TINDER PROFILE PICTURES IN LONDON, UK – A SOCIAL SEMIOTICS STUDY

ABSTRACT Cyclical and bidirectional relationship(s) between technology and today’s romantic gratifications have reformed how people seek romance. On another end, gender performances largely underpin humans’ romantic gratification. This is where Tinder, as a dating application, affords unique opportunities for those seeking romances through portraying gender performances. A number of studies concluded that, in romance-seeking ventures, male’s masculinity and female’s femininity generally remained conformist to their respective biological attributes. Therefore, this study aimed to evaluate nuances of gender performances portrayed in dating apps such as Tinder. Since Tinder profile picture, as a form of visual text, is a source rife with gender performance cues, this study focused on the visual component – profile pictures. Profile Picture Protocol (PPP), derived from notable social semiotics frameworks, was established. This study revealed that, albeit a major affinity towards more saturated bright colors in the observed data, color choices in profile pictures were not conclusive to determine gender performatives, mainly due to possible duality in meanings when other elements (body gestures and clothing choices) were taken into consideration. Formal clothing choices were only found in the male group, which was conformist to the previous studies. Foregrounding bodily features was evident in both male and female group’s profile pictures, which indicated that the male group also exuded an element of femininity, which leaned towards contestating the previous findings. Actors’ angles that were frontal as well as eye-level, indicated a need for social closeness and friendliness emulation, were fashionable in both gender groups, which was initially prevalent in the female group. Limitations were put forth. Keywords; profile picture; visual text, social semiotics, gender performance, Tinder ABSTRAK Hubungan siklus dan dua arah antara teknologi dan gratifikasi romantisme dewasa ini telah mengubah cara orang mencari hubungan romansa. Di sisi lain, ekspresi gender umumnya mendukung gratifikasi romantis manusia. Di sinilah Tinder, sebagai aplikasi kencan, memberikan peluang unik bagi mereka yang mencari romansa melalui ekspresi gender. Sejumlah penelitian menyimpulkan bahwa, dalam usaha pencarian romansa, maskulinitas pria dan femininitas wanita umumnya tetap mengikuti atribut biologis masing-masing. Oleh karena itu, penelitian ini bertujuan untuk mengevaluasi ekspresi gender yang digambarkan dalam aplikasi kencan seperti Tinder. Karena gambar profil Tinder, sebagai bentuk teks visual, adalah sumber penuh dengan isyarat ekspresi gender, penelitian ini berfokus pada komponen visual - gambar profil. Profile Picture Protocol (PPP), berasal dari kerangka kerja semiotika sosial terkemuka, dikonstruksikan. Studi ini mengungkap bahwa, meskipun memiliki ketertarikan umum terhadap warna-warna cerah yang lebih jenuh pada data yang diamati, pilihan warna dalam gambar profil tidak konklusif untuk menentukan ekspkresi gender, terutama karena kemungkinan dualitas dalam makna ketika elemen lain (gerakan tubuh dan pilihan pakaian) disertakan dalam pertimbangan. Pilihan pakaian formal hanya ditemukan pada kelompok pria, yang sesuai dengan penelitian sebelumnya. Gambaran tubuh terdepan terlihat dalam gambar profil kelompok laki-laki dan perempuan, yang menunjukkan bahwa kelompok laki-laki juga memancarkan unsur feminitas, yang condong ke arah mengontestasi temuan sebelumnya. Sudut para aktor yang frontal maupun setinggi mata, mengindikasikan keinginan atas kedekatan sosial dan emulasi keramahan, yang umum di kedua kelompok gender, yang awalnya lazim di kelompok perempuan. Keterbatasan penelitian disampaikan. Kata Kunci; teks visual, Semiotika Sosial, performa gender, aplikasi berkencan

Innovative polymer nanoparticles for energy storage and anti-counterfeiting applications

La nanociencia y la nanotecnología representan uno de los campos más interesantes de la ciencia moderna, con un carácter altamente multi- e interdisciplinar, ya que combina diferentes disciplinas como la química, la biología, la física y la ingeniería, aprovechando sus principios y procesos. Los nanomateriales han estado presentes en la naturaleza y en la vida desde tiempos ancestrales. Sin embargo, no es hasta la revolución industrial cuando se desarrollan nuevas herramientas tecnológicas que propiciarán en el futuro un gran interés por el estudio de los nanomateriales. Una de las grandes características de los nanomateriales es que presentan propiedades diferentes al disminuir su tamaño a nivel nanométrico ya que poseen una mayor área superficial. Las nanopartículas poliméricas (PNPs) han recibido recientemente mucho interés y tienen un papel clave en diversas áreas como fotónica, electrónica, sensores, medicina, control de la contaminación y tecnología ambiental. La transformación del polímero disponible a granel en un material polimérico de tamaño nanométrico ha proporcionado la aparición de propiedades nuevas e interesantes sin cambiar la composición del polímero. Con el fin de desarrollar nuevos dispositivos de alta tecnología para diversas aplicaciones, los investigadores necesitan controlar mejor la estructura y la función de las nanopartículas poliméricas comprendiendo el papel del tamaño, la forma y la composición. La interfaz de investigación en la que las nanopartículas poliméricas se encuentran con la química analítica, la biomedicina, la construcción, la electroquímica y otros campos ofrece ricas oportunidades para revelar nuevas propiedades químicas, médicas y biológicas de los nanomateriales y descubrir muchas funciones y aplicaciones nuevas de estos materiales. Las nanopartículas poliméricas, por tanto, representan una plataforma para poder desarrollar nuevas aplicaciones, estudiando nuevas rutas sintéticas para obtener las propiedades óptimas para cada aplicación deseada. En la tesis, se describen los avances recientes en la síntesis de nuevas nanopartículas poliméricas con propiedades avanzadas mediante diferentes estrategias. Las estrategias sintéticas incluyen la síntesis química y física para la producción controlada de nanopartículas poliméricas con morfologías bien definidas. En concreto, se desarrollaron diferentes tipos de nanopartículas con altas prestaciones en aplicaciones en almacenamiento de energía y en el campo de la antifalsificación. Los beneficios tecnológicos que se han desarrollado en la tesis doctoral residen en el diseño de los nuevos nanomateriales con potenciales aplicaciones que además pueden aportar valor a tecnologías y productos ya existentes, como además dar soluciones a problemas medioambientales y sociales actuales. Estas nuevas rutas sintéticas y pruebas de concepto creadas en la presente tesis doctoral generan nuevo conocimiento que da valor tanto a nivel académico como industrial.

Multi-user visible light communications: State-of-the-art and future directions

Visible light communications (VLC) builds upon the dual use of existing lighting infrastructure for wireless data transmission. VLC has recently gained interest as cost-effective, secure, and energy-efficient wireless access technology particularly for indoor user-dense environments. While initial studies in this area are mainly limited to single-user point-to-point links, more recent efforts have focused on multi-user VLC systems in an effort to transform VLC into a scalable and fully networked wireless technology. In this paper, we provide a comprehensive overview of multi-user VLC systems discussing the recent advances on multi-user precoding, multiple access, resource allocation, and mobility management. We further provide possible directions for future research in this emerging topic.King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia ; TÜBİTAKPublisher versio

Data catalog series for space science and applications flight missions. Volume 4A: Descriptions of meteorological and terrestrial applications spacecraft and investigations

The National Space Science Data Center (NSSDC) provides data from and information about space science and applications flight investigations in support of additional studies beyond those performed as the principal part of any flight mission. The Earth-orbiting spacecraft for investigations of the earth and its atmosphere is discussed. Geodetic tracking data are included in this category. The principal subject areas presented are meteorology and earth resources survey, and the spacecraft selection is made according to those subjects. All experiments on board the spacecraft are described. No attempt is made to reference investigations that are related to the above disciplines, but that are described in other volumes of this series

Small business innovation research. Abstracts of 1988 phase 1 awards

Non-proprietary proposal abstracts of Phase 1 Small Business Innovation Research (SBIR) projects supported by NASA are presented. Projects in the fields of aeronautical propulsion, aerodynamics, acoustics, aircraft systems, materials and structures, teleoperators and robots, computer sciences, information systems, data processing, spacecraft propulsion, bioastronautics, satellite communication, and space processing are covered