Разработка искровых коммутаторов с циркуляцией газа для ГИН Аркадьева-Маркса

Спроектирован и собран управляемый искровой разрядник с циркуляцией газа и инициированием на принципе "искажения поля" для генератора импульсных напряжений Аркадьева - Маркса. Впервые получены данные о ресурсе работы электродов из нержавеющей стали многоступенчатого разрядника в газе под давлением при работе в генераторе Аркадьева–Маркса в длительном режиме с частотой следования импульсов от 5 до 8 имп/сек. с энергией в импульсе 2 кДж.A controlled spark gap with gas circulation and initiation on the "field distortion" principle for the Arkadiev-Marx pulse voltage generator was designed and assembled. For the first time, data were obtained on the operating life of stainless steel electrodes of a multistage spark gap in a pressurized gas when operating in the Arkadev-Marx generator in a long-time regime with a pulse repetition rate of 5 to 8 pulses per second. with a pulse energy of 2 kJ

Playing God? Synthetic biology as a theological and ethical challenge

In the ethical debate over synthetic biology the formula “playing god” is widely used in order to attack this new branch of biotechnology. The article analyses, contextualizes and criticises this usage with respect to the theological concepts of creation, sin and humans as created in the image of God. Against the background of these theological understandings an ethical corridor of how to responsibly cope with the societal challenges of synthetic biology is presented

Untersuchungen zur Rolle von Calcium bei der Resistenz des Weizens gegen Schwarzrost

TIB: DW 875 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Lava fountain jet noise during the 2018 eruption of fissure 8 of Kīlauea volcano

Real-time monitoring is crucial to assess hazards and mitigate risks of sustained volcanic eruptions that last hours to months or more. Sustained eruptions have been shown to produce a low frequency (infrasonic) form of jet noise. We analyze the lava fountaining at fissure 8 during the 2018 Lower East Rift Zone eruption of Kīlauea volcano, Hawaii, and connect changes in fountain properties with recorded infrasound signals from an array about 500 m from the fountain using jet noise scaling laws and visual imagery. Video footage from the eruption reveals a change in lava fountain dynamics from a tall, distinct fountain at the beginning of June to a low fountain with a turbulent, out-pouring lava pond surrounded by a tephra cone by mid-June. During mid-June, the sound pressure level reaches a maximum, and peak frequency drops. We develop a model that uses jet noise scaling relationships to estimate changes in volcanic jet diameter and jet velocity from infrasound sound pressure levels and peak frequencies. The results of this model indicate a decrease in velocity in mid-June which coincides with the decrease in fountain height. Furthermore, the model results suggest an increase in jet diameter, which can be explained by the larger width of the fountain that resembles a turbulent lava pond compared to the distinct fountain at the beginning of June. The agreement between the infrasound-derived and visually observed changes in fountain dynamics suggests that jet noise scaling relationships can be used to monitor lava fountain dynamics using infrasound recordings