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- 4 Material und Umwelt (126)
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Paper des Monats
- ja (4)
Eingeladener Vortrag
- nein (123)
Water is generally considered to be an undesirable substance in fuel system, which may lead to microbial contamination. The antibacterial strategies that can turn water into things of value with high disinfection efficacy have been urgently needed for fuel system. Here, we reveal a water-fueled autocatalytic bactericidal pathway comprised by bi-metal micro-electrode system, which can spontaneously produce reactive oxygen species (mainly H2O2 and O2•–) by the electron Fenton-like reaction in water medium without external energy., The respiratory chain component of bacteria and the galvanic corrosion on the coated metals were two electron sources in the system. The specific model of Ag-Ru water-fueled autocatalytic (WFA) microelectrode particles presents extremely high disinfection efficiency (>99.9999%) in less than one hour for three aerobic bacteria (Escherichia coli, Pseudomonas aeruginosa and Bacillus subtilis) in LB media and high disinfection efficiency for the anaerobic bacteria (Desulfovibrio alaskensis) in Postgate E media without natural light irradiation. Overall, the novel WFA Ag-Ru antibacterial material explored in this study has a high potential for sterilizing applications in fuel system and this work provides the potential for the development of non-chemical and water-based antibacterial materials, such as WFA Ag-Ru antibacterial coating on stainless steel.
Recent bus fires in Europe, such as the bus fire in France 2015 with 43 fatalities and the bus fire in Germany 2017 with 19 fatalities, show that these fires can be very hazardous and time for escape can be too short. Recently, several fire safety measures came into force for busses. Engine compartment suppression systems will be mandatory for all busses in Europe. This is a big step in fire safety as about 80 % of fires start in the engine compartment. However, in several recent bus fires a time of less than 5 minutes has been reported from detection of the fire to a fully developed fire. As normally many people are on board of a bus, a bus fire is not comparable to fire in a home. Especially for people with reduced mobility or for fires after a collision the available times for escape are too short. When the fire service is on scene the transition to a fully developed fire might have happened already. Passengers who are not able to escape in this short period of time mostly cannot be rescued by the fire service even with quick response times because of the dramatic fire development. Fires that do not start in the engine compartment but develop in the cabin are rarer but extremely dangerous because fire and smoke spread very rapidly. The reason for the fast fire and smoke development in the cabin are the materials which are used. Over the last tens of years materials in busses had major developments. The amount of plastic in the cabin has grown significantly. In a modern coach the biggest fire load often is not the fuel anymore but the interior materials.
Bus fire safety is mainly regulated by ECE regulations R 118 and R 107. A comparison with European standards for trains shows that for trains, in contrast to busses, a holistic fire concept exists. Fire scenarios as well as escape scenarios and passenger behaviour are taken into account, resulting in fire safety regulations on a high level compared with bus regulations. In contrast to regulations for train materials no limits for heat or smoke production are given for bus materials. Larger heat release values promote more rapid fire spread. Also smoke production and toxicity are key factors in fires. The smoke reduces the visibility in the case of fire, and together with the toxicity of the smoke can make escape from the vehicle impossible. Figure 1 shows the remains of the bus from the recent severe bus fire in Germany in 2017.
As a result of experience with real cases and results from research projects we think it is necessary to develop a holistic fire safety concept for busses as it exists for other transport means like railways. The fire safety concept should include vehicle configuration and design as well as areas of use, e.g. use in cities, use in long-distance traffic on motorways and use in tunnels.
What isotopes can do...
(2019)
Für die Sanierung von Bauwerken werden meist Informationen über die innere Struktur und den Aufbau, Belastungszustände, Feuchte- und Salzgehalte benötigt. Die Untersuchung mit zerstörungsarmen und -freien Methoden minimieren die dazu nötigen Eingriffe. Ebenfalls bieten die ZfP-Verfahren die Möglichkeit, den Erfolg einer Maßnahme zu kontrollieren sowie Prozesse über einen langen Zeitraum zu beobachten (Monitoring). Die vorliegende Arbeit befasst sich mit der zerstörungsfreien Untersuchung von inneren Strukturen und des Aufbaus von Mauerwerk mittels Ultraschall und Radar. Der untersuchte Querschnitt wird tomografisch rekonstruiert. Diese Darstellungsart bietet den Vorteil der Tiefenbestimmung von Objekten und der besseren Visualisierung für Auftraggeber und/oder Laien. Es wurden die Laufzeiten der Longitudinalwellen rekonstruiert. Die Frequenzen der Ultraschalluntersuchungen lagen bei 25 kHz sowie 85 kHz und der Radaruntersuchungen bei 900 MHz sowie 1,5 GHz. Die Rekonstruktion erfolgte mit dem Tomografieprogramm “Geo- Tom“, welches auf der Grundlage des SIRT-Algorithmus arbeitet. Die untersuchten Querschnitte beinhalteten Anomalien bestehend aus Luft, Granit, Holz und Mörtel. Die Abmaße der Anomalien lagen zwischen 10-27 cm bezogen auf einen Querschnitt von 0,76 x 1,0 m. Eine Ortung der Anomalien war möglich, wenn diese eine Laufzeitveränderung von mindestens der Größe des Messfehlers bewirken. Die Größe dieser Laufzeitdifferenz ist abhängig von den Abmaßen der Anomalie und dem Kontrast der elektromagnetischen bzw. akustischen Eigenschaften zwischen Anomalie und umgebenden Material. Eine Aussage über die Größe der Anomalie ist möglich, jedoch kann auf die Form nur bedingt geschlussfolgert werden. Des Weiteren kann durch den Vergleich der beiden Verfahren ein Rückschluss auf die möglichen Materialien der Anomalie gezogen werden.
Diese Arbeit beschäftigt sich mit den Eigenschaften der photonenzählenden und spektralauflösenden Detektortechnik und möglichen Anwendungsgebieten in der zerstörungsfreien Prüfung. Dabei wurden konventionelle und photonenzählende Detektortechniken hinsichtlich der Bildqualität und Anwendbarkeit bei unterschiedlichen Prüfaufgaben verglichen und untersucht, inwiefern sich die Energieschwellwertsetzung auf die erreichbare Bildqualität und eine Materialdiskriminierbarkeit bei verschiedenen radiographischen Verfahren auswirkt.
Anhand von Anwendungsbeispielen wurden diese Eigenschaften und deren Auswirkung auf das Messergebnis analysiert. Neben der Radiographie wurden auch dreidimensionale Verfahren wie CT und Laminographie berücksichtigt.
Als eine der wichtigsten Eigenschaften der photonenzählenden Detektortechnik wurden zunächst die Energieauflösung des photonenzählenden Detektors und die Homogenität der Energieantwort über größere Detektorbereiche bestimmt. Dabei stellte sich heraus, dass die Energieauflösung eines abgegrenzten Detektorbereichs ca. 32 % bei 60 keV beträgt und die Streuung in der Energieantwort der einzelnen Detektorbereiche ca. 12 % ausmacht, woraus sich eine Gesamtunsicherheit in der spektralen Detektorantwort von ca. 44 % ergibt. Die geringe Energieauflösung und das stark heterogene Verhalten der Detektorbereiche ergeben sich vor allem aus der Detektorelektronik, welche nur eine globale Energieschwellwertsetzung zulässt.
Trotz dieser Einschränkungen konnte demonstriert werden, dass auch konventionelle radiographische Verfahren, wie Radiographie oder CT, vom Einsatz der photonenzählenden Technik profitieren. So ist es mit dieser Technik möglich, bei sehr geringen Dosisleistungen (z.B. aufgrund der Durchstrahlung großer Wandstärken von dichten Materialien) noch sehr gute Bildqualitäten zu erreichen. Die hohe Dynamik und Kontrastempfindlichkeit dieser Technik begünstigen die Inspektion von Leichtbauwerkstoffen wie Faserverbunde, was anhand von Vergleichen mit herkömmlicher Detektortechnik und anderen ZfP-Verfahren gezeigt werden konnte. Daneben konnte durch den Einsatz der Energieschwellwertsetzung der Einfluss von nicht bildzeichnender Streustrahlung im Röntgenbild um bis zu 20 % reduziert werden. Die Auswirkungen von Aufhärtungseffekten in der CT konnten sogar um bis zu Faktor 1 000 (in der mittleren quadratischen Abweichung), im Vergleich zu herkömmlicher Detektortechnik, reduziert werden.
Der Einsatz von photonenzählender Detektortechnik mit Röntgenblitzröhren ist hingegen nicht sinnvoll, da aufgrund der hohen Photonendichte pro Puls und einer endlichen Totzeit des Detektors in der Größenordnung der Pulsbreite eines Blitzes nur ein geringes Signal detektiert werden kann.
Im Hinblick auf eine Materialdiskriminierbarkeit konnte demonstriert werden, dass im Fall einer Radiographie anhand der Energieschwellwertsetzung im Detektor eine materialstärkenunabhängige Diskriminierung zwischen zwei Materialien (hier: Al und Fe) erzielt werden kann. Unter Einsatz mehrerer Energiefenster und eines Verfahrens der explorativen und multivariaten Datenanalyse konnte eine materialaufgelöste CT eines Multi-Material-Phantoms erreicht werden, wobei die Schwächungskoeffizienten der enthaltenen Materialien im relevanten Energieberiech teilweise sehr dicht beieinander lagen.
Neben Radiographie und CT wurde auch die Möglichkeit einer materialaufgelösten Laminographie am Beispiel eines glasfaserverstärkten Rotorblatts untersucht. Anhand der Energieschwellwertsetzung war nicht nur eine eindeutige Trennung der Glasfasern von der Epoxidharzmatrix möglich, sondern auch eine signifikante Reduzierung der durch die Laminographie entstandenen Artefakte. Der damit verbundene Gewinn an Information führt zu einer verbesserten Aussagefähigkeit des Untersuchungsergebnisses, was letztendlich eine gesteigerte Betriebssicherheit zur Folge hat.