replacement of a tractor is an influential factor affecting timely farm operation. the accurate prediction of repair and maintenance costs is essential to selection of a replacement model. this study used empirical data for 60 two-wheel drive (2wd) tractors from astan ghods-e razavi agroindustry. the types and numbers of tractors used were the massey ferguson 285 (17), fiat (10), john deere 314...

The paper considers the technological scheme of hydraulic elevator installation, according to which water from a pressure tank is supplied by working pump well through two parallel pipelines: monitor with washing nozzle for destroying sand plug and supply pipeline that connected containing suction pipelines taking slurry cleaning single- double-column wells plugs methodology calculation selecti...

This article presents separate results of studies devoted to the study and analysis vibrational phenomena occurring on pumping units along line pressure pipeline surveyed stations, associated with flow pulsation in water supply path cavitation manifested units. As is known, operation pumps accompanied by hydrodynamic oscillatory phenomena, which are expressed non-stationarity field velocities p...

The objective of this research work was to investigate the potential control models based on reinforcement learning in optimization solar thermal cooling systems (STCS) operation through a case study. In this, performance installation working with traditional predictive approach and (RL)-based analyzed compared using specific realistic simulation tool. order achieve proposed objective, system m...

Rubber dams are inflatable and deflatable hydraulic structures. Thousands of rubber dams have been installed worldwide for various purposes: irrigation, water supply, power generation, tidal barrier, flood control, environmental improvement, and recreation. Furthermore, rubber dams have been used in cold areas where the temperature is as low as –40°C. The simplicity and flexibility of the rubbe...

cotton (gossypium hirsutum l.) as a unique crop in natural fiber production has an important role in texture industry. it has also a large share in oil production for human nutrition and as a protein concentrate for animal feeding. therefore, cotton role in job opportunities in agriculture, industry and business divisions are undeniable. in order to determine the share of each direct and indire...

OBJECTIVE To study the prevalence and severity of hyperglycemia in nondiabetic patients undergoing cardiac operation. METHODS In an observational prospective study, 282 non-diabetic patients underwent elective off-pump (n=101) or on-pump (n=181) coronary artery bypass grafting (CABG) surgery from March 2006 to July 2007 in Madani Heart Hospital, Tabriz, Iran. Blood glucose (BG) levels were me...

energy costs comprise considerable amount of operation costs in water distribution networks. optimal management of energy costs to provide required water for consumers with desired quality is of high importance. to achieve this, optimization is defined as a powerful tool. in this paper, by focusing on operation phase, multi-objective optimization of water supply network considering hydraulic, q...

at the final stages of a coronary artery bypass graft operation on a 64-year-old man, an experienced physician attempted to insert an intra-aortic balloon pump into the femoral artery via the seldinger technique. however, while the balloon pump was being passed over the guide wire, the latter was completely lost. the guide wire should be held at the tip at all times to prevent passage into the ...