flow regulator Articles
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Aeration performance of hydrodynamic flow regulators
Hydrodynamic flow regulators are used in environmental engineering as a replacement for traditional flow throttling devices. They are extremely efficient, reliable and free from the common disadvantages of traditional devices. Recent research by the authors indicated that the atomization of a liquid by hydrodynamic flow regulators accelerates oxygenation and may be used for improving the ...
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Climate Change, Flow Regulation and Land-Use Effects on the Hydrology of the Peace-Athabasca-Slave System; Findings from the Northern Rivers Ecosystem Initiative
The Northern Rivers Ecosystem Initiative (NREI) was established in the late 1990s to address important science questions resulting from previous studies undertaken by the Northern Rivers Basin Study (NRBS). This manuscript summarizes the results from a number of reports on hydrologic research conducted on the Peace-Athabasca-Slave river and lake systems. Specific concerns expressed by the NRBS ...
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Linking environmental flows to sediment dynamics
This is a policy discussion paper aimed at addressing possible alternative approaches for environmental flows (e-Flows) assessment and identification within the context of best strategies for fluvial restoration. We focus on dammed rivers in Mediterranean regions. Fluvial species and their ecological integrity are the result of their evolutionary adaptation to river habitats. Flowing water is ...
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Calibration of gas mixers in the low flow range
Most dynamic gas mixers use flow regulators to create defined gas mixtures. QCAL Messtechnik uses thermal mass flow controllers ( MFC ) from various, renowned manufacturers. These MFCs are reliably calibrated proven by a calibration certificate – traceable to National Standards. But these calibrations are limited. The whitepaper describes 2 methods to extend the application range of gas mixers ...
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An overview of post-divorce support for Muslim children in the context of South African Law, Islamic Law and the proposed 2010 Muslim Marriages Bill
After 350 years of non-recognition, and following a protracted procedure, Muslim religious marriages and divorces are currently in the process of being directly and formally recognised in terms of South African Law. A 2010 ‘code’ of Muslim Personal Law has been framed that can satisfy and synthesise both diverse Muslim (ideological) perspectives and the relevant constitutional commands ...
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Sea Life Kansas City – Life Support Systems Helped by IPEX Case Study
Developed by Merlin Entertainment, the Sea Life Kansas City Aquarium is a popular destination for both tourists and local residents. Situated in the Crown Center close to Downtown Kansas City, the aquarium boasts 30 special displays, educational programs, touch pools, and a glass tunnel that lets you walk on the simulated sea floor surrounded by water brimming with sea life. In all, the aquarium ...
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Generation of daily naturalized flow at ungaged control points
The development of daily naturalized flow in the water rights analysis package (WRAP) model at ungaged stations has difficulties because of low daily flow measurement at gaged stations, low available monthly naturalized flow, and budget constraints. This study proposes a procedure for developing daily naturalized flow at ungaged stations. The soil and water assessment tool (SWAT) model was ...
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Sustainable development in the neoliberal periphery? The experience of sustainability politics in Bolivia 1989-1997
This paper offers an analysis of the political and institutional development of environmental regulation in Bolivia from 1989 to 1997. Additionally, a concept of sustainable development as proposed by the government of Gonzalo Sanchez de Lozada in the national development plan of 1994 is critically discussed. The conclusions drawn reveal a clear contradiction between the prevailing neo-liberal ...
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WaReg protects homes from flooding in Sweden - Case Study
Location: Backaryd, Sweden Customer: Backaryds Vattenverk Problem: Backaryd Water Treatment plant backwash their filters regularly. During this process water is released into the town sewer network at a rate of 16 l/s. The towns sewer network is dimensioned to cope with 5 l/s so when it receives 16 l/s it becomes problematic for downstream residents. When the backwashing occurs, homes in the ...
By Wapro AB
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Ash Discharge Valve
The opening and closing part of the electric plug valve is a gate plate, and the direction of movement of the gate plate is perpendicular to the direction of the fluid. The electric plug valve can only be fully opened and fully closed and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valves form a wedge, and the ...
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Pneumatic Plug Valve
Pneumatic plug valve is a main control equipment for the flow or delivery of powder, crystal grain, granular materials and small pieces of material. It is widely used in metallurgy, mining, building materials, food, chemical industries to control flow changes or cut off quickly. Pneumatic flapper valve has the advantages of simple structure, flexible operation, light weight, no jamming, and is ...
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Precision accuracy for Gas mixtures & blends - Case study
Precision control and measurement accuracy are the key requirements for gas mixing and blending applications. Vögtlin’s thermal mass flow regulators permit both master-slave mixtures and gas mixtures with fixed percentage proportions. RED-Y Thermal Mass Meter Features: High measurement accuracy and fast regulation High repeatability Calibration with the actual gas Independent ...
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Monitoring Oxygen and Carbon Monoxide in Dive Tanks
I'm convinced of the benefit of analyzing tanks for O2 percentage and the presence of CO (carbon monoxide). On my last dive trip I found that my Cootwo was giving really wonky readings (O2 randomly off by 5~10%, despite having a good sensor, recent calibration, etc) and the CO sensor was due for replacement/calibration. With Divenav out of business (or at least, out of the business of hardware ...
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Chemicals - Case Study
Challenge Long cake washing times and unsatisfactory results have a negative effect on the profitability of pigment production. Solution Development of membrane filter elements with customer-specific product design Targeted redesign and optimisation of filtration surfaces Modification of the filling channels and channel design in order to regulate the flow speed Configuration of filter ...
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How To Deal With The Faults Of HF Welding PVC?
If the time of hf welding pvc is too long, there are often some faults. After the failure occurs, users must find and deal with it in the first time and solve it in time. For different faults, the solutions are different. The following solutions are listed here for everyone: If the welding effect is not ideal or it cannot be welded or the workpiece is damaged when it is in the process of hf ...
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Mass flow controllers for Regulating gas flow rates - Case study
For automatic or manual control, Voegtlin’s thermal mass flow controllers allow high precision regulation of gas flow rates and consistent quality of gas mixtures. The fast control response minimises the setting time. CMOS Sensor Technology By using high-precision CMOS technology (semiconductor sensors) Voegtlin’s thermal measurement and control devices are setting new standards in ...
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How To Deal With The Faults Of Hf Welding Pvc?
If the time of hf welding pvc is too long, there are often some faults. After the failure occurs, users must find and deal with it in the first time and solve it in time. For different faults, the solutions are different. The following solutions are listed here for everyone: If the welding effect is not ideal or it cannot be welded or the workpiece is damaged when it is in the process of hf ...
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Method to determine the power efficiency of UV disinfection plants and its application to low pressure plants for drinking water
In this paper we present a method to determine the power efficiency of ultraviolet (UV) disinfection plants and apply this to low pressure plants for drinking water. In UV disinfection plants the water flow is regulated to ensure that microorganisms receive the necessary fluence for inactivation while passing through. The flow depends on the UV transmission (UVT) of the water. The lower the ...
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Would a two-stage N-removal be a suitable technology to implement at full scale the use of anammox for sewage treatment?
Sewage treatment with anammox could be implemented through a two-step reactor system, where the first reactor would be devoted to partial nitritation. A process design was sketched including control loops. The control strategy regulates the flow-rate of the rich ammonium sidestream produced after dewatering the digested sludge, to keep the ammonium concentration at a set point in the partial ...
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Does Micro Switch Carry Out Similar Function As Rocker Switch?
There have been lots of arguments about micro switches and rocker switches amongst users in recent times. Most people usually assume that both are one and the same which is not true in any way. As a matter of fact, rocker switches and micro switches have been built or developed for different purposes by companies. Failure to understand this fact will make you spend money purchasing the wrong type ...
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