Potential structural materials and design concepts for light airplanes Final report

Potential structural materials and design concepts evaluated for light aircraft application

Potential Structural Materials and Design Concepts for Light Airplanes

Potential structural materials and design considerations for helicopters and light general aircraf

Oiseaux et drones - comment éviter les conflits?/ Vögel und Drohnen – wie Konflikte vermieden warden.

L’utilisation privée et commer- ciale de drones a considérable- ment augmenté. Ces appareils peuvent gravement perturber oiseaux et autres animaux. Il est toutefois possible de limiter ces désagréments en respectant quelques règles simples. Die private und kommerzielle Nutzung von Drohnen hat enorm zugenommen. Für Vögel und an- dere Tiere können Drohnen eine erhebliche Störungsquelle dar- stellen. Durch das Einhalten ein- facher Richtlinien lassen sich Stö- rungen aber deutlich reduzieren

A low cost way for assessing bird risk hazards in power lines: Fixed-wing small Unmanned Aircraft Systems

Accidents on power lines are one of the most important causes of man-induced mortality for raptors and soaring birds. The factors that condition the hazard have been extensively studied, and currently there are a variety of technical solutions available to miti- gate the risk. Most of the resources in conservation projects to reduce avian mortality now are invested in fieldwork to monitor the lines, which diverts the resources available to install actual corrective measures to mitigate bird hazard. Little progress has been achieved in the methodology to characterize line risk, which is an expensive, tedious, and time- consuming task. In this work we describe the use of low cost small unmanned aircraft systems (sUAS) equipped with on-board cameras for power line surveillance. As a case study, we characterized four power lines, geo-referenced every pylon in selected portions, and assessed their hazard for birds. We compare the effectiveness of two variants of the sUAS method for data acquisition and two methods of plane control. This work provides evidence of the usefulness of sUAS as a fast, inexpensive, and practical tool in conservation biology, adding to their already known applications in wildlife monitoring, the environmental impact assessment of infrastructures

Implementation of polarization diversity pulse-pair technique using airborne W-band radar

This work describes the implementation of polarization diversity on the National Research Council Canada W-band Doppler radar and presents the first-ever airborne Doppler measurements derived via polarization diversity pulse-pair processing. The polarization diversity pulse-pair measurements are interleaved with standard pulse-pair measurements with staggered pulse repetition frequency, this allows a better understanding of the strengths and drawbacks of polarization diversity, a methodology that has been recently proposed for wind-focused Doppler radar space missions. Polarization diversity has the clear advantage of making possible Doppler observations of very fast decorrelating media (as expected when deploying Doppler radars on fast-moving satellites) and of widening the Nyquist interval, thus enabling the observation of very high Doppler velocities (up to more than 100 m s−1 in the present work). Crosstalk between the two polarizations, mainly caused by depolarization at backscattering, deteriorated the quality of the observations by introducing ghost echoes in the power signals and by increasing the noise level in the Doppler measurements. In the different cases analyzed during the field campaigns, the regions affected by crosstalk were generally associated with highly depolarized surface returns and depolarization of backscatter from hydrometeors located at short ranges from the aircraft. The variance of the Doppler velocity estimates can be well predicted from theory and were also estimated directly from the observed correlation between the H-polarized and V-polarized successive pulses. The study represents a key milestone towards the implementation of polarization diversity in Doppler space-borne radars

Drones: una nueva tecnología para el estudio y monitoreo de fauna y hábitats.

The study and management of wildlife requires constant monitoring of the state of the populations and their habitats. This information is necessary to detect possible threats and to carry out effectively the management and conservation work. In the last 15 years the incorporation of a new tool of aerial monitoring of wildlife, colloquially named “drones”, has been seen, and in this study a brief description of these and their application in wildlife monitoring is made. The purpose is to present the advantages but also alert about their possible limitation

Progress Towards the Remote Sensing of Aircraft Icing Hazards

NASA has teamed with the FAA, DoD, industry, and academia for research into the remote detection and measurement of atmospheric conditions leading to aircraft icing hazards. The ultimate goal of this effort is to provide pilots, controllers, and dispatchers sufficient information to allow aircraft to avoid or minimize their exposure to the hazards of in-flight icing. Since the hazard of in-flight icing is the outcome of aircraft flight through clouds containing supercooled liquid water and strongly influenced by the aircraft s speed and configuration and by the length of exposure, the hazard cannot be directly detected, but must be inferred based upon the measurement of conducive atmospheric conditions. Therefore, icing hazard detection is accomplished through the detection and measurement of liquid water in regions of measured sub-freezing air temperatures. The icing environment is currently remotely measured from the ground with a system fusing radar, lidar, and multifrequency microwave radiometer sensors. Based upon expected ice accretion severity for the measured environment, a resultant aircraft hazard is then calculated. Because of the power, size, weight, and view angle constraints of airborne platforms, the current ground-based solution is not applicable for flight. Two current airborne concepts are based upon the use of either multifrequency radiometers or multifrequency radar. Both ground-based and airborne solutions are required for the future since groundbased systems can provide hazard detection for all aircraft in airport terminal regions while airborne systems will be needed to provide equipped aircraft with flight path coverage between terminal regions

ICELUS: Investigating strategy switching for throughput maximization to a mobile sink

Wireless sensor networks offer a pragmatic solution for monitoring in a variety of scenarios. For efficient and practical data gathering, especially in large-scale systems deployed in inaccessible areas, unmanned vehicles are becoming a compelling solution. The added infrastructure flexibility comes at the cost of limited contact time between the mobile entity and the stationary devices. The channel fading caused by mobility further decreases the data yield.We address this challenge by analysing the relevant classes of data transfer schemes and identifying adaptation conditions that enable the selection of the best fitting strategy. The result of this analysis, ICELUS, provides an integrated protocol that exploits the available communication resources. © 2016 IFIP

IRIS: Efficient Visualization, Data Analysis and Experiment Management for Wireless Sensor Networks

The design of ubiquitous computing environments is challenging, mainly due to the unforeseeable impact of real-world environments on the system performance. A crucial step to validate the behavior of these systems is to perform in-field experiments under various conditions. We introduce IRIS, an experiment management and data processing tool allowing the definition of arbitrary complex data analysis applications. While focusing on Wireless Sensor Networks, IRIS supports the seamless integration of heterogeneous data gathering technologies. The resulting flexibility and extensibility enable the definition of various services, from experiment management and performance evaluation to user-specific applications and visualization. IRIS demonstrated its effectiveness in three real-life use cases, offering a valuable support for in-field experimentation and development of customized applications for interfacing the end user with the system

Between mountains and frontiers: the Roman settlement system in the provinces of Germania Superior, Raetia and Noricum

This study investigates the settlement system in the Roman provinces of Germania Superior, Raetia and Noricum by combining historical and archaeological sources. From this study it appears that a complex settlement system existed in the region before the Roman conquest. However, under influence of the Roman administration that settlement system changed. Transitions could be observed in the location of centres, in their lay-out and services. A total of 30 self-governing towns were found for the Roman period, founded between the 1st century and the early 3rd century AD. Because this relatively low number of towns allowed many subordinate centres in the region to take up central services of cultural or economic kind for a wider region. The study identified the presence of the Roman army as an important incentive for the urban development in the region. Many Roman towns originated from a military base and the needs for communication, agricultural products, utensils and cultural activities in order to sustain the soldiers encouraged the countryside and centres to flourish. In a final chapter the study takes a critical look at the numerous remains of this Roman settlement system which are nowadays considered as heritage.The Unification of the Mediterranean World (400 BC - 400 AD