Results 81 to 90 of about 459,696 (189)

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

Spatio-temporal generalised frequency response functions [PDF]

, 2010
The concept of generalised frequency response functions (GFRFs), which were developed for nonlinear system identification and analysis, is extended to continuous spatio-temporal dynamical systems normally described by partial differential equations (PDEs)
Billings, S.A., Coca, D., Guo, L.Z., Guo, Y.Z., Lang, Z.Q.   +4 more
core  

Extreme scenario-based risk assessment of landslide-induced impulse wave from spoil disposal slope instability in hy-dropower projects

Frontiers in Earth Science
In the development of hydropower projects in high-mountain gorge regions, the insta-bility of high-position spoil disposal areas under extreme scenarios and the subsequent disaster chains triggered by landslide-induced impulse waves pose serious threats ...
Huabo Xiao, Huabo Xiao, Wenzheng Xu, Xiujun Dong, Xiaoyu Yi   +4 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

Low power arcjet performance [PDF]

An experimental investigation was performed to evaluate arc jet operation at low power. A standard, 1 kW, constricted arc jet was run using nozzles with three different constrictor diameters.
Curran, Francis M., Sarmiento, Charles J.   +1 more
core   +1 more source

Investigations of Chemical Nonequilibrium Two-Phase Flow in Solid Rocket Motor Nozzles

Aerospace
In this study, a calculation method for two-phase nonequilibrium flow in solid rocket motor nozzles is established, and an in-depth investigation into the nonequilibrium flow within the nozzle is conducted.
Tianhao Feng, Wei Zhao, Yan Ba, Yanchao Zhu, Yiwen Guan, Wenjing Yang   +5 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