Türkiye’deki Goethe-Institut Kütüphaneleri: Almanca kitaplardan daha fazlasını bulabilirsiniz

This article introduces the libraries / information centers of the Goethe-Institut in Turkey. The activities consist of providing collections with books and media related to Germany-searchable via Internet -, offering an information service for Germany-related requests, creating webpages directing to Turkish Internet users, supporting exchange between Turkish and German librarians and library institutions, cooperating with Turkish libraries and institutions of librarians ’ education and promoting literature and translations. In all the mentioned fields the Goethe-Institut increasingly cooperates with European partner organisations.Bu çalışmanı amacı Türkiye ’deki Goethe-Institut kütüphanelerinin / bilgi merkezlerinin görevlerini tanıtmaktadır. Bunların faaliyetleri arasında şunlar vardır : Online katalog üzerinden araştırılabilen Almanya ile ilgili medya kay­nakların kullanıma sunulması, bir enformasyon servisi ve internet aracılığıyla uygun bilgilerin aktarılması, Türk ve Alman kütüphaneciler ile kütüphane kuruluşları arasında kütüphanecilikle ilgili mesleki bilgi alışverişinin teşviki, Türk kütüphaneleriyle ve kütüphanecilik eğitimi veren kuruluşlarla işbirliği, edebiyatın ve çeviri eserlerin desteklenmesi. Bunların yanı sıra, Goethe-Institut Avrupalı meslektaşlarıyla da giderek artan oranda işbirliği yapmaktadır

Almanya’da Kütüphanecilik Eğitimi

Son yıllarda yaşanan teknolojik gelişmeler, kütüphanecilik mesleğinin değişime uğramasına yol açmıştır. Gerek bilgi uzmanlarının mesleklerini algılama biçimi, gerekse meslek mensuplarında bulunması gerekli olan nitelik ve yetenekler değiş­miş ve çeşitlenmiştir. Bunun doğal bir sonucu olarak, kütüphanecilik eğitimi de değişime uğramıştır ve uğramaktadır. Bu makalede Almanya’daki kütüphaneci­lik eğitimi konusunda yaşanan değişimler, gelişmeler ve yeni eğilimler üzerinde durulmaktadır

Resonance coupling in plasmonic nanomatryoshka homo- and heterodimers

Here, we examine the electromagnetic (EM) energy coupling and hybridization of plasmon resonances between closely spaced concentric nanoshells known as “nanomatryoshka” (NM) units in symmetric and antisymmetric compositions using the Finite Difference Time Domain (FDTD) analysis. Utilizing plasmon hybridization model, we calculated the energy level diagrams and verified that, in the symmetric dimer (in-phase mode in a homodimer), plasmonic bonding modes are dominant and tunable within the considered bandwidth. In contrast, in the antisymmetric dimer (out-of-phase mode in a heterodimer), due to the lack of the geometrical symmetry, new antibonding modes appear in the extinction profile, and this condition gives rise to repeal of dipolar field coupling. We also studied the extinction spectra and positions of the antibonding and bonding modes excited due to the energy coupling between silver and gold NM units in a heterodimer structure. Our analysis suggest abnormal shifts in the higher energy modes. We propose a method to analyze the behavior of multilayer concentric nanoshell particles in an antisymmetric orientation employing full dielectric function calculations and the Drude model based on interband transitions in metallic components. This study provides a method to predict the behavior of the higher energy plasmon resonant modes in entirely antisymmetric structures such as compositional heterodimers

Hybrid 3D Localization for Visible Light Communication Systems

In this study, we investigate hybrid utilization of angle-of-arrival (AOA) and received signal strength (RSS) information in visible light communication (VLC) systems for 3D localization. We show that AOA-based localization method allows the receiver to locate itself via a least squares estimator by exploiting the directionality of light-emitting diodes (LEDs). We then prove that when the RSS information is taken into account, the positioning accuracy of AOA-based localization can be improved further using a weighted least squares solution. On the other hand, when the radiation patterns of LEDs are explicitly considered in the estimation, RSS-based localization yields highly accurate results. In order to deal with the system of nonlinear equations for RSS-based localization, we develop an analytical learning rule based on the Newton-Raphson method. The non-convex structure is addressed by initializing the learning rule based on 1) location estimates, and 2) a newly developed method, which we refer as random report and cluster algorithm. As a benchmark, we also derive analytical expression of the Cramer-Rao lower bound (CRLB) for RSS-based localization, which captures any deployment scenario positioning in 3D geometry. Finally, we demonstrate the effectiveness of the proposed solutions for a wide range of LED characteristics and orientations through extensive computer simulations.Comment: Submitted to IEEE/OSA Journal of Lightwave Technology (10 pages, 14 figures

A review of thz technologies for rapid sensing and detection of viruses including SARS-CoV-2

Virus epidemics such as Ebola virus, Zika virus, MERS-coronavirus, and others have wreaked havoc on humanity in the last decade. In addition, a coronavirus (SARS-CoV-2) pandemic and its continuously evolving mutants have become so deadly that they have forced the entire technical advancement of healthcare into peril. Traditional ways of detecting these viruses have been successful to some extent, but they are costly, time-consuming, and require specialized human resources. Terahertz-based biosensors have the potential to lead the way for low-cost, non-invasive, and rapid virus detection. This review explores the latest progresses in terahertz technology-based biosensors for the virus, viral particle, and antigen detection, as well as upcoming research directions in the field

A Software-Defined Multi-Element VLC Architecture

In the modern era of radio frequency (RF) spectrum crunch, visible light communication (VLC) is a recent and promising alternative technology that operates at the visible light spectrum. Thanks to its unlicensed and large bandwidth, VLC can deliver high throughput, better energy efficiency, and low cost data communications. In this article, a hybrid RF/VLC architecture is considered that can simultaneously provide light- ing and communication coverage across a room. Considered architecture involves a novel multi-element hemispherical bulb design, which can transmit multiple data streams over light emitting diode (LED) modules. Simulations considering various VLC transmitter configurations and topologies show that good link quality and high spatial reuse can be maintained in typical indoor communication scenarios