نتایج جستجو برای: low pressure irrigation

تعداد نتایج: 1586042  

Journal: :International Braz J Urol 2021

Purpose: High intra-renal pressures during flexible ureteroscopy have been associated with adverse renal tissue changes as well pyelovenous backflow. Our objective was to investigate the effect of various on histologic and fluid extravasation simulated ureteroscopy. Materials Methods: Twenty-four juvenile pig kidneys intact ureters were cannulated an Olympus ureteroscope without a ureteral acce...

2010
Nannan Wen Daoliang Li Daokun Ma Qisheng Ding

Abstract. Based on the problems caused by current automatic irrigation system with a large number of cables, such as installation, maintenance, and difficult expansion, this paper proposed a wireless integrated irrigation control system and developed a wireless intelligent valve controller which can satisfy the requirements for agricultural irrigation in our country. The controller consisted o...

2017
Dalong Zhang Qingjie Du Zhi Zhang Xiaocong Jiao Xiaoming Song Jianming Li

Although atmospheric vapour pressure deficit (VPD) has been widely recognized as the evaporative driving force for water transport, the potential to reduce plant water consumption and improve water productivity by regulating VPD is highly uncertain. To bridge this gap, water transport in combination with plant productivity was examined in tomato (Solanum lycopersicum L.) plants grown under cont...

Journal: :کشاورزی (منتشر نمی شود) 0
حمیدرضا حجازی کارشناس ارشد مهندسی تاسیسات آبیاری، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج صلاح کوچک زاده دانشیار، گروه مهندسی آبیاری و آبادانی، پردیس کشاورزی ومنابع طبیعی، دانشگاه تهران، کرج

a design discharge is an important issue in the design process of pressurized irrigation networks. underestimating the desing discharge affect, the required pressure and offtake discharge, increase the cost of the network. because of the lack of a standard and reliable method for this propuse, usually different approches are used by designers. the network fails to provide the required flow rate...

Journal: :آب و خاک 0
ناصر صداقتی سید جواد حسینی فرد اکبر محمدی محمدآبادی

unsustainable harvesting of agricultural water resources in the province of kerman, has caused an annual average of one-meter drop in ground water levels. surface irrigation methods in pistachio trees have low efficiency because of inherent characteristics and its incorrect application, as well as low access to water resource in pistachio regions. therefore under the current critical condition,...

2000
F. J. Villalobos F. Orgaz L. Testi E. Fereres

Efficient irrigation management requires a good quantification of evapotranspiration. In the case of olive orchards, which are the dominant crop in vast areas of southern Europe, very little information exists on evaporation. Measurements of aerodynamic conductance and evaporation above and below an olive orchard allowed the calibration of a transpiration model of olive trees based on the Penma...

ژورنال: علوم آب و خاک 2001
زندپارسا, شاهرخ , سلطانی, غلامرضا , سپاس‌خواه, علیرضا ,

In this study, the optimum irrigation depths for corn grain production under different conditions, i.e. maximum grain yield production and maximum benefit under limited land and water conditions, were determined under sprinkler irrigation in Bajgah (15 km. north of Shiraz). The results showed that, the optimum depth of irrigation for maximum grain yield production was 77.0 cm. Because of low pr...

2017
Tsugihisa Sasaki Tsutomu Sounou Hideki Tsuji Kazuhisa Sugiyama

PURPOSE To facilitate the analysis of lacrimal conditions, we utilized high-definition dacryoendoscopy (HDD) and undertook observations with a pressure-controlled air-insufflation system. We report the safety and performance of HDD. METHODS In this retrospective, non-randomized clinical trial, 46 patients (14 males and 32 females; age range 39-91 years; mean age ± SD 70.3±12.0 years) who had ...

Journal: :Applied and environmental microbiology 1979
B E Moore B P Sagik C A Sorber

Because of the relatively low number of indigenous enteric viruses recovered from secondary wastewater effluents, their presence in air (aerosols) as a result of wastewater spray irrigation requires extensive sampling. Methodology to allow the recovery of indigenous enteroviruses from aerosols generated at an operational wastewater irrigation site was tested under both laboratory and field cond...

Journal: :Turkish journal of agricultural engineering research 2021

Under the prevailing climate change world is currently facing, efficient irrigation water management essential to ensure food security, especially in countries with similar Nigeria. Hence, this study was undertaken at Research Farm of Federal Polytechnic, Ilaro, Ogun State, Nigeria evaluate evaporation losses during sprinkler between March and July 2019. Experiments were performed using 360 ro...

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