Full-scale investigation of in-situ iron and alkalinity generation for efficient sulfide control

Maneuverability of planing craft is a complicated hydrodynamic subject that needs more studies to comprehend its characteristics. Planing craft drivers follow a common practice for maneuver of the craft that is fundamentally different from ship’s standards. In situ full-scale tests are normally necessary to understand the maneuverability characteristics of planing craft. In this paper, a study has been conducted to illustrate maneuverability characteristics of planing craft by full-scale tests. Accelerating and turning maneuver tests are conducted on two cases at different forward speeds and rudder angles. In each test, dynamic trim, trajectory, speed, roll of the craft are recorded. The tests are performed in planing mode, semi-planing mode, and transition between planing mode to semi-planing mode to study the effects of the craft forward speed and consequently running attitude on the maneuverability. Analysis of the data reveals that the Steady Turning Diameter (STD) of the planing craft may be as large as 40 L, while it rarely goes beyond 5 L for ships. Results also show that a turning maneuver starting at planing mode might end in semi-planing mode. This transition can remarkably improve the performance characteristics of the planing craft’s maneuverability. Therefore, an alternative practice is proposed instead of the classic turning maneuver. In this practice, the craft traveling in the planing mode is transitioned to the semi-planing mode by forward speed reduction first, and then the turning maneuver is executed.

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Coupled Thermo-Hydro-Geochemical Models of Engineered Barrier Systems: The Febex Project

MRS Proceedings ◽

10.1557/proc-663-561 ◽

2000 ◽

Vol 663 ◽

Cited By ~ 2

Author(s):

J. Samper ◽

R. Juncosa ◽

V. Navarro ◽

J. Delgado ◽

L. Montenegro ◽

...

Keyword(s):

Large Scale ◽

Reference Model ◽

Numerical Models ◽

Full Scale ◽

Small Scale ◽

Model Parameters ◽

In Situ Test ◽

Wide Range ◽

Engineered Barrier

ABSTRACTFEBEX (Full-scale Engineered Barrier EXperiment) is a demonstration and research project dealing with the bentonite engineered barrier designed for sealing and containment of waste in a high level radioactive waste repository (HLWR). It includes two main experiments: an situ full-scale test performed at Grimsel (GTS) and a mock-up test operating since February 1997 at CIEMAT facilities in Madrid (Spain) [1,2,3]. One of the objectives of FEBEX is the development and testing of conceptual and numerical models for the thermal, hydrodynamic, and geochemical (THG) processes expected to take place in engineered clay barriers. A significant improvement in coupled THG modeling of the clay barrier has been achieved both in terms of a better understanding of THG processes and more sophisticated THG computer codes. The ability of these models to reproduce the observed THG patterns in a wide range of THG conditions enhances the confidence in their prediction capabilities. Numerical THG models of heating and hydration experiments performed on small-scale lab cells provide excellent results for temperatures, water inflow and final water content in the cells [3]. Calculated concentrations at the end of the experiments reproduce most of the patterns of measured data. In general, the fit of concentrations of dissolved species is better than that of exchanged cations. These models were later used to simulate the evolution of the large-scale experiments (in situ and mock-up). Some thermo-hydrodynamic hypotheses and bentonite parameters were slightly revised during TH calibration of the mock-up test. The results of the reference model reproduce simultaneously the observed water inflows and bentonite temperatures and relative humidities. Although the model is highly sensitive to one-at-a-time variations in model parameters, the possibility of parameter combinations leading to similar fits cannot be precluded. The TH model of the “in situ” test is based on the same bentonite TH parameters and assumptions as for the “mock-up” test. Granite parameters were slightly modified during the calibration process in order to reproduce the observed thermal and hydrodynamic evolution. The reference model captures properly relative humidities and temperatures in the bentonite [3]. It also reproduces the observed spatial distribution of water pressures and temperatures in the granite. Once calibrated the TH aspects of the model, predictions of the THG evolution of both tests were performed. Data from the dismantling of the in situ test, which is planned for the summer of 2001, will provide a unique opportunity to test and validate current THG models of the EBS.

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In situ visualisation of the abundant Chloroflexi populations in full-scale anaerobic digesters and the fate of immigrating species

PLoS ONE ◽

10.1371/journal.pone.0206255 ◽

2018 ◽

Vol 13 (11) ◽

pp. e0206255 ◽

Cited By ~ 8

Author(s):

Francesca Petriglieri ◽

Marta Nierychlo ◽

Per Halkjær Nielsen ◽

Simon Jon McIlroy

Keyword(s):

Full Scale ◽

Anaerobic Digesters

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Research on in situ continuous off-line chemical cleaning in full-scale membrane bioreactors

Bioresource Technology Reports ◽

10.1016/j.biteb.2018.10.005 ◽

2018 ◽

Vol 4 ◽

pp. 186-192 ◽

Cited By ~ 2

Author(s):

Liwei Liu ◽

Jin Tian ◽

Chunhui Luo ◽

Chunsheng Chen ◽

Jicheng Liu ◽

...

Keyword(s):

Membrane Bioreactors ◽

Full Scale ◽

Chemical Cleaning

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“Assessing Ex/In-Situ Full Scale Soil Bioremediation Processes Through Laboratory Experiments: 2 Case Studies”

Bioremediation of Pollutants in Soil and Water ◽

10.1520/stp13027s ◽

2009 ◽

pp. 49-49-9

Author(s):

R Galvez-Cloutier ◽

RN Yong ◽

J Hadjinicolaou

Keyword(s):

Case Studies ◽

Laboratory Experiments ◽

Full Scale ◽

Soil Bioremediation ◽

Bioremediation Processes

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Development of a Field Instrument to Quantify Frictional Drag of an In-Service Ship Hull

10.5957/wmtc-2015-202 ◽

2015 ◽

Author(s):

J. Travis Hunsucker ◽

Geoffrey Swain

Keyword(s):

19Th Century ◽

Detrimental Effect ◽

Experimental Testing ◽

Channel Length ◽

Full Scale ◽

Frictional Drag ◽

Late 19Th Century ◽

Marine Fouling ◽

Accurate Quantification

It has been shown that the presence of marine fouling, even as a light slime, will cause a detrimental effect on the powering or speed of a full-scale ship. Studies from as early as the late 19th century have attempted to quantify the increase in power or decrease in speed imposed on a ship from the presence of hull roughness. The accurate quantification is limited and often difficult and expensive to obtain. The present study aims to develop an instrument that will remove some ambiguity by directly measuring the frictional drag of a ship in situ. Results from experimental testing of a prototype in the lab are presented and used to identify the channel length, height, and accuracy limitations of a field deployable prototype.

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