Search results for "PWD"

showing 2 items of 2 documents

Weed and Weeding Effects on Medicinal Herbs

2017

Competition with weeds exerts significant depressive effects on yield and quality features of Medicinal Plants (MPs). According to the crop, the part of plant to be harvested, the environmental features (including cropping technique) and the severity of infestation, yield losses due to the presence of weeds may vary within wide intervals. Furthermore, unlike the majority of other crops, MPs are cultivated with the goal to obtain relevant quantities of specific secondary metabolites, whose final quantity determines the quality level (and, consequently, the market value) of the harvested drug. Almost all papers addressed to this topic agree on the statement that unrestricted weed growth may a…

0106 biological sciencesmedia_common.quotation_subjectBiologymedicine.disease_cause01 natural sciencesCompetition (biology)ToxicologyCropparasitic diseasesInfestationGrazingmedicinemedia_commonBiomass (ecology)fungicompetition yields essential oil (EO) weeding management critical period for weed control (CPWD) relative losses (RL)food and beverages04 agricultural and veterinary sciencesSettore AGR/02 - Agronomia E Coltivazioni ErbaceeHorticulture040103 agronomy & agriculture0401 agriculture forestry and fisheriesWeedMulchCropping010606 plant biology & botany
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Automated Kick Control Procedure for an Influx in Managed Pressure Drilling Operations

2016

Within drilling of oil and gas wells, the Managed Pressure Drilling (MPD) method with active control of wellbore pressure during drilling has partly evolved from conventional well control procedures. However, for MPD operations the instrumentation is typically more extensive compared to conventional drilling. Despite this, any influx of formation fluids (commonly known as a kick) during MPD operations is typically handled by conventional well control methods, at least if the kick is estimated to be larger than a threshold value. Conventional well control procedures rely on manual control of the blow out preventer, pumps, and choke valves and do not capitalize on the benefits from the instru…

Engineeringbusiness.industryControl (management)DrillingWell ControlControl engineeringlcsh:QA75.5-76.95Computer Science ApplicationsPWDControl and Systems EngineeringModeling and SimulationKicklcsh:Electronic computers. Computer sciencebusinessMPDSoftwareModeling, Identification and Control
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