Results 91 to 100 of about 457,205 (201)

Demonstration of a pulsing liquid hydrogen/liquid oxygen thruster [PDF]

Successful operation of a pulsing liquid hydrogen/liquid oxygen attitude control propulsion system thruster (1250 lb sub f) at cryogenic inlet conditions while maintaining high specific impulse and low impulse bit capability was demonstrated. Significant
Choenman, L., Herr, P. N.
core   +1 more source

Results of a low power ice protection system test and a new method of imaging data analysis [PDF]

Tests were conducted on a BF Goodrich De-Icing System's Pneumatic Impulse Ice Protection (PIIP) system in the NASA Lewis Icing Research Tunnel (IRT). Characterization studies were done on shed ice particle size by changing the input pressure and cycling ...
Bond, Thomas H., Mesander, Geert A., Shin, Jaiwon   +2 more
core   +1 more source

Research on the Response Characteristics of Core Grounding Current Signals in Power Transformers Under Different Operating Conditions

Energies
This study delves into the response characteristics of core grounding current signals in power transformers across different operating conditions, aiming to enhance the accuracy of transformer condition assessment.
Li Wang, Hongwei Ding, Dong Cai, Yu Liu, Peng Du, Xiankang Dai, Zhenghai Sha, Xutao Han   +7 more
doaj   +1 more source

Employment of mud-pulse generator for improvement of efficiency of a wellbore producing in complex mining and geological conditions

Petroleum Research
In this study, the employment of mud-pulse generators to improve the efficiency of wellbores under complex mining and geological conditions is examined. A systemic analysis is made of the primary theoretical basis of the study.
Bibinur Akhymbayeva
doaj   +1 more source

Space charge inhibition effect of nano-Fe3O4 on improvement of impulse breakdown voltage of transformer oil based on improved Kerr optic measurements

AIP Advances, 2015
Transformer oil-based nanofluids (NFs) with 0.03 g/L Fe3O4 nanoparticle content exhibit 11.2% higher positive impulse breakdown voltage levels than pure transformer oils.
Qing Yang, Fei Yu, Wenxia Sima, Markus Zahn   +3 more
doaj   +1 more source

High power impulse magnetron sputtering under industrial conditions

, 2011
In this thesis, the recent development step of magnetron sputtering, termed high power impulse magnetron sputtering (HiPIMS) has been studied. Compared to conventional magnetron sputtering HiPIMS provides a higher plasma density which can ionise the sputtered material.
openaire   +1 more source

Comparative results of computational and theoretical study of the annular nozzle with a flat central body

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение
One of the ways to improve specific characteristics of the power plant of a launch vehicle for ladeploying payload to the near-Earth space is to provide the possibility of operation of a fixed nozzle in the design mode over the whole active leg of the ...
A. A. Kirshina, A. A. Levikhin, A. Yu. Kirshin   +2 more
doaj   +1 more source

Aerodynamic analysis of a 1.5 kW two-stage counter-rotating partial-admission impulse turbine for small-scale power system with a high expansion pressure ratio

Case Studies in Thermal Engineering
Partial-admission impulse turbine is suitable for small-scale power cycles with a high expansion pressure ratio (EPR) and a low mass flow rate. However, the exit velocity of a single-stage turbine is very high, leading to a large exit loss.
Ningjian Peng, Enhua Wang, Wenli Wang, Jinjun Lu, Minghua Li   +4 more
doaj   +1 more source

Assessment of adaptive properties of winter triticale cultivars by yield in the Middle Urals

Аграрная наука Евро-Северо-Востока
Triticale is a versatile crop with high yield potential but insufficient resistance to unfavourable growing conditions. Therefore, the combination of high yield, adaptability, plasticity, stability and stress resistance of varieties is of great ...
T. А. Babaytseva, I. N. Serebrennikova, E. F. Vafina, A. V. Milchakova   +3 more
doaj   +1 more source

A Case Study on Current Developments and Future Direction of Hypergolic Propellant Systems

Aerospace
Hypergolic propellants are easy to start and restart, stay liquid at normal temperatures, and avoid storage issues, making them ideal for spacecraft propulsion systems.
Nadir Yilmaz, Michael Arowolo, Alpaslan Atmanli   +2 more
doaj   +1 more source