Photonic-Electronic Ultra-Broadband Signal Processing: Concepts, Devices, and Applications

Combining photonic integrated circuits (PIC) with millimeter-wave electronics opens novel perspectives in generation and detection of ultra-broadband signals with disruptive potential for a wide variety of applications. Here, we will give an overview on our recent progress in the field of ultra-broadband photonic-electronic signal processing, covering device concepts such as silicon plasmonic integration, signal processing concepts such as Kramers-Kronig-based phase reconstruction of THz signals, as well as application demonstrations in the field of high-speed wireless data transmission

Optical Arbitrary Waveform Measurement (OAWM) on the Silicon Photonic Platform

We demonstrate optical arbitrary waveform measurement (OAWM) using a silicon pho-tonic spectral slicer. Exploiting maximal-ratio combining (MRC), we demonstrate the viability of the scheme by reconstructing 100-GBd 64QAM signals with high quality

Organizing risk: organization and management theory for the risk society

Risk has become a crucial part of organizing, affecting a wide range of organizations in all sectors. We identify, review and integrate diverse literatures relevant to organizing risk, building on an existing framework that describes how risk is organized in three ‘modes’ – prospectively, in real-time, and retrospectively. We then identify three critical issues in the existing literature: its fragmented nature; its neglect of the tensions associated with each of the modes; and its tendency to assume that the meaning of an object in relation to risk is singular and stable. We provide a series of new insights with regard to each of these issues. First, we develop the concept of a risk cycle that shows how organizations engage with all three modes and transition between them over time. Second, we explain why the tensions have been largely ignored and show how studies using a risk work perspective can provide further insights into them. Third, we develop the concept of risk translation to highlight the ways in the meanings of risks can be transformed and to identify the political consequences of such translations. We conclude the paper with a research agenda to elaborate these insights and ideas further

Assessment of groundwater pollution around Torbali, Izmir, Turkey

Torbali region is located near Izmir, Turkey. Industrial activities in this region have been developing from last two decades. The untreated industrial effluents discharged into the Fetrek River causes groundwater pollution in the region. Since groundwater resources of the region are used for drinking, agricultural and industrial purposes the groundwater quality assessment is done by analyzing the concentrations of main cations (Na+, K+, Ca2+, Mg2+) and anions (Cl-, SO42-, NO3-, HCO3-). Additionally, physical and chemical parameters (EC, total hardness, Eh, O-2 and pH) were determined. The results show that the concentrations are generally within drinking-water limits. Only the results of TDS and EC concentrations exceed the permissible limits for drinking water in the industrial belt of the region, while NO3- values exceed the permissible limits in the vicinity of the agricultural area. Concentrations are expected to increase in the next years as no effective sewage collection and treatment is in place