Current Flow Articles on Environmental XPRT

Do you know the two most important words required to understand oil spill booming?

Much has been written (incorrectly) about how to deploy boom in order to protect, deflect or contain oil. We have long promoted using math and science when deploying spill countermeasures not only because it works, but because it’s faster, safer, more effective and it saves time, money and impact. What we’ll focus on in this article is the where of ...

May 18, 2017

By Elastec

Reverse Osmosis and Nanofiltration Membrane Filtration Systems: Common Problems and How to Fix Them

Reverse osmosis (RO) and nanofiltration (NF) are membrane filtration technologies that are designed to remove solute ions and molecules from a pretreated liquid stream. Well-designed RO/NF units are compact and demand relatively little maintenance, making them an attractive alternative to conventional treatment trains. Even despite the merits of today’s efficient RO/NF technologies, it pays ...

May 4, 2017

By SAMCO Technologies, Inc.

NEFCO density current Baffle design

The study was originally conceived to evaluate the performance of the NEFCO Stamford Baffle design and several variations on that design to better understand the parameters that affected baffle performance. To that end, the plan was straightforward. The first step was the simulation of a 70-ft diameter clarifier. This clarifier would serve as the test bed to calculate the predicted effectiveness ...

Apr. 1, 2011

By NEFCO, Inc.

Protection Relay for Shaft Current and Voltage

Introduction The paper deals with the specific protection relay for all types of generators. The instrument, called Shaft Current and Voltage Protection Relay (SCVP) was developed at KONCAR – Electric Engineering Institute Inc. This instrument is a part of Institute's product line used for monitoring and diagnosis of rotating electrical machines. The most important parts ...

Sep. 27, 2015

By KONCAR - Electrical Engineering Institute Inc.

HCL System Exceeds Current Regulations

Chemron manufactures high-quality specialty chemicals and surfactants for personal care products, industrial, institutional, oil field, mining, coatings, lubricants and water treatment. Some of the operations result in the creation of hydrochloric acid with high variable rates. As expressed by Bill Frost, of Chemron: “Chemronmaintains a strong environmental commitment, which views regulations as ...

Sep. 1, 1990

Oil droplets and solid particles removal using circular separator with inclined coalescence mediums: comparison between co-current and counter-current flow

This research investigated the effects of co- and counter-current flow patterns on oil-water-solid separation efficiencies of a circular separator with inclined coalescence mediums. Oil-water-solid separations were tested at different influent concentrations and flowrates. Removal efficiencies increased as influent flowrate decreased, and their correlationship can be represented by power ...

Sep. 1, 2010

By IWA Publishing

Impact of urban WWTP and CSO fluxes on river peak flow extremes under current and future climate conditions

The impact of urban water fluxes on the river system outflow of the Grote Nete catchment (Belgium) was studied. First the impact of the Waste Water Treatment Plant (WWTP) and the Combined Sewer Overflow (CSO) outflows on the river system for the current climatic conditions was determined by simulating the urban fluxes as point sources in a detailed, hydrodynamic river model. Comparison was made ...

Jun. 21, 2013

By IWA Publishing

New topology for management of bi-directional power flow between vehicle and grid with reduced ripple current at unity power factor

In this paper, a new topology of single-phase pulse width modulated (PWM) AC-DC converter is proposed for bidirectional power flow between plug-in hybrid electric vehicle (PHEV) and the grid. This converter consists of a PWM voltage source converter (VSC) and a ripple reduction circuit. The ripple reduction circuit consists of a switching leg and an inductor. The inductor is connected between ...

Oct. 7, 2013

By Inderscience Publishers

Influence of wave and current flow on sediment-carrying capacity and sediment flux at the water–sediment interface

In nearshore waters, spatial and temporal scales of waves, tidal currents, and circulation patterns vary greatly. It is, therefore, difficult to combine these factors’ effects when trying to predict sediment transport processes. This paper proposes the concept of significant wave velocity, which combines the effects of waves, tides, and ocean currents using the horizontal kinetic energy ...

Sep. 29, 2014

By IWA Publishing

Measuring the Dispersion Coefficient with Acoustic Doppler Current Profilers

Abstract: A method is evaluated for estimating the longitudinal dispersion coefficient K from velocities and bathymetry measured with an acoustic Doppler current profiler #1;ADCP. If shear dispersion controls the mixing, the dispersion coefficient can be estimated from measurements of velocity and depth in a cross section. The dispersion coefficient has typically been measured by costly and ...

Aug. 1, 2007

By Teledyne RD Instruments

European waters - current status and future challenges - a synthesis

The Europe 2020 strategy is the European Union's strategy for economic growth in Europe over the next decade. This strategy envisages the development of a 'greener', more environmentally friendly economy in Europe. Sustainable water management is a critical element of this green economy because healthy and resilient ecosystems provide the services needed to sustain human well‑being and our ...

Nov. 26, 2012

By European Environment Agency (EEA)

Current Trends in Modelling Water Distribution Systems

Untitled Document Hydraulic Modelling is emerging from the infrastructure planning offices of our water utilities, where it continues to play a vital role in optimising capital investment projects, to take a ...

Jan. 1, 2004

By Innovyze

Current Trends in Environmental Noise Calculation Software in Europe

Introduction This paper briefly describes the state of the art of development of environmental noise calculation software in Europe, concentrated on the following areas: • The Harmonoise and Imagine projects and the Good Practice Guide on Strategic Noise Mapping • The role of combining measurements and calculations for more flexible problem solving • Uncertainty: qualitative methods ...

Jan. 1, 2005

By Brüel & Kjær Sound & Vibration Measurement A/S

Current Trends in Environmental Noise Monitoring in Europe

Introduction This paper briefly describes the state of the art of environmental noise monitoring development in Europe, including the needs, standards, legislation, data, technology, techniques and tools. This paper will concentrate on the following areas: • How Imagine and the development of ISO 20906 and ISO 1996 affect noise monitoring systems • The need and role of professional ...

Jan. 1, 2005

By Brüel & Kjær Sound & Vibration Measurement A/S

The HogMag Eddy Current Separator - Metal Recovery with Ease

Why a HogMag? To benefit the customer and the environment the HogMag Eddy Current Separator is fitted with energy saving motors which generates a higher level of speed being achieved increaseing productivity, reducing maintenance and operation costs and improving overall up to 100% metal recovery depending on material. What is A HogMag Eddy Current Separator? ...

Jun. 10, 2015

By EcoHog Ltd

Acoustic Doppler Current Profiler measurements near a weir with fish pass: assessing solutions to compass errors, spatial data referencing and spatial flow heterogeneity

There has been an increasing interest in the use of Acoustic Doppler Current Profilers (ADCPs) to characterise the hydraulic conditions near river engineering structures such as dams, fish passes and groins, as part of ecological and hydromorphological assessments. However, such ADCP applications can be limited by compass errors, obstructed view to navigation satellites, frequent loss of ...

Nov. 18, 2015

By IWA Publishing

Exothermic reaction induced by high-density current in metals: possible nuclear origin

Since 1989, many experimenters worked on low-energy nuclear reactions (LENR). They face both an experimental and a theoretical dilemma: how to design simple and convincing experiments in a complex system and if the phenomenon has a nuclear origin, why do they observe no radiation. A rather simple water mass flow calorimeter was designed to study this phenomenon under different experimental ...

Jan. 3, 2006

By Inderscience Publishers

Zig–zag transformer for neutral current compensation in an isolated wind energy system

This paper presents a voltage and frequency controller with neutral current compensation in a stand alone wind energy conversion system (WECS) employing an asynchronous generator. The proposed controller consists of a three leg insulated gate bipolar junction transistor (IGBT)–based voltage source converter and a battery energy storage system (BESS) at its DC bus. The neutral terminal for the ...

Jul. 19, 2012

By Inderscience Publishers

Multi–physics modelling of nuclear reactors: current practices in a nutshell

Current practices in the nuclear industry to model the transient behaviour of nuclear reactors are based on the use of different solvers for resolving the different physical fields, and to some extent the different scales. The overall time–dependence is computed by a coarse–mesh neutronic solver coupled to a coarse–mesh thermal–hydraulic solver. The meso–scale information in the thermal–hydraulic ...

Jun. 6, 2013

By Inderscience Publishers

Calibration of The LISFLOOD Model For Europe: Current Status And Way Forward

The hydrological model LISFLOOD model forms the core of the European Flood Alert System (EFAS) and is used for impact studies to evaluate the effect of changes in land use and climate on the hydrological behaviour in catchments across Europe. The accuracy of the model predictions depends on the ability of the model to capture the dominating hydrological processes that transfer precipitation into ...

Jan. 1, 2005

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