In spatial database, geographic information system (GIS) technology and system engineering theory, the hydro-ecological spatial database was built, and the corresponding hydro-ecological spatial database management information system was designed and developed. From aspects of the data organization and classification, the overall structure of the database, database construction processes and da...

Hydropower plants (HPPs) contribute a significant share of Russia’s electricity generation. With the prospects developing this sector and harnessing hydroenergy potential, it is necessary to consider methods for modernizing hydroelectric installations. This article examines new method regulating active (Pelton) turbines based on modifying nozzle flow rate through ejection spent liquid from runn...

The stochastic and intermittent characteristic of wind power present great challenge to the operation of power system. A novel unit commitment problem (UCP) model is proposed in this paper. As the status of thermal units need to be described by binary number, Binary Particle Swarm Optimization (BPSO) algorithm is proposed to find the optimum schedule scheme. Case studies on the 10 units system ...

background patient-controlled analgesia is used for both labor and postoperative analgesia. objectives this study aimed to assess user satisfaction and functionality of two ambulatory, electronic patient controlled analgesia devices, the gemstar pump hospira inc., illinois, usa) and the ambit ambulatory infusion therapy pump (sorenson medical products, utah, usa). patients and methods it was a ...

The title limonoid 14-de-oxyxyloccensin K, C(27)H(34)O(7), isolated from Chisocheton ceramicus (Meliaceae), features an oxygen linkage between carbon-3 and carbon-8 along with a tetra-hydro-furyl sub-unit. The six-membered rings adopt chair configurations and the tetra-hydro-furyl sub-unit has an envelope shape.

Abstract With the emerging energy demand, water shortage in rural areas, electric supply challenges, and urgent needs for net zero technologies, there has been a recent response with alternative Hydro-Powered Pumping (HPP) technology, known as Bunyip. The recently developed system continues to build commercial success, designed overcome several limitations associated previous technology of Hydr...

Digitally controlled electrohydraulic (EH) closed-center valves and load sensing hydraulic pump systems have been quickly replacing the older generation of hydro-mechanically controlled (pilot actuated, mechanically controlled) open-center valves and fixed displacement pump systems in mobile equipment applications such as earth moving and construction equipment (i.e. wheel loaders, excavators, ...

This paper considers a condition-based maintenance (i.e. CBM) model for the hydro generating unit in the deregulated power system. As the downtime cost of the generating unit varies according to the time-varying electricity price, the economic dependence among the critical component of the generating unit is dynamic. In this paper, the proposed DynamicEconomic-Dependence and proportional hazard...