Готові списки джерел за темами / DRDC8

Добірка наукової літератури з теми "DRDC8"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "DRDC8"

Lavoie, Hugo, Eldon Puckrin, Jean-Marc Thériault, and François Bouffard. "Passive Standoff Detection of SF6 at a Distance of 5.7 km by Differential Fourier Transform Infrared Radiometry." Applied Spectroscopy 59, no. 10 (October 2005): 1189–93. http://dx.doi.org/10.1366/000370205774431007.

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Recent results are presented on the passive detection, identification, and quantification of a vapor cloud of SF6 measured at a horizontal standoff distance of 5.7 km using a dual-beam interferometer optimized for background signal suppression. The measurements were performed at Defense Research and Development Canada (DRDC)–Valcartier during a number of recent open-air experiments. The measurement approach is based on the differential passive standoff detection method that has been developed by DRDC Valcartier during the past few years. This work represents the first such measurement reported in the open literature for a standoff distance as large as 5.7 km. These results clearly demonstrate the capability of the differential radiometry approach to the detection, identification, and quantification of chemical vapor clouds located at long distances from the sensor.

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Ball, J., I. Dimayuga, I. Summerell, M. Totland, G. Jonkmans, J. Whitlock, A. El-jaby, and E. Inrig. "CANADIAN NATIONAL NUCLEAR FORENSICS CAPABILITY PROJECT." AECL Nuclear Review 4, no. 1 (June 1, 2015): 1–7. http://dx.doi.org/10.12943/anr.2015.00043.

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Following the 2010 Nuclear Security Summit, Canada expanded its existing capability for nuclear forensics by establishing a national nuclear forensics laboratory network, which would include a capability to perform forensic analysis on nuclear and other radioactive material, as well as on traditional evidence contaminated with radioactive material. At the same time, the need for a national nuclear forensics library of signatures of nuclear and radioactive materials under Canadian regulatory control was recognized. The Canadian Safety and Security Program, administered by Defence Research and Development Canada's Centre for Security Science (DRDC CSS), funds science and technology initiatives to enhance Canada's preparedness for prevention of and response to potential threats. DRDC CSS, with assistance from Canadian Nuclear Laboratories, formerly Atomic Energy of Canada Limited, is leading the Canadian National Nuclear Forensics Capability Project to develop a coordinated, comprehensive, and timely national nuclear forensics capability.

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Binder, Carolyn, Sean Pecknold, Calder L. Robinson, and S. B. Martin. "Directional detection of simulated whale calls and ambient noise in a busy harbour." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A107. http://dx.doi.org/10.1121/10.0015701.

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Timely information on marine mammal presence in, or near, sonar training areas can be used to minimize the risk of harming these animals. Defence Research and Development Canada (DRDC) has recently been investigating a variety of acoustic technologies to facilitate real-time marine mammal monitoring in high noise (including ship noise and sonar signals) environments. DRDC assessed the directional detection and localization capability of a network of sub-surface volumetric and vertical line arrays against the noisy backdrop of the busy harbour during an experiment conducted in Bedford Basin, NS. Playbacks of Southern Resident killer whale calls and North Atlantic right whale upcalls, as well as simulated calls, were transmitted. To assess variability in bearing estimates for whale calls in different frequency bands, an acoustic source was fixed at a single location for half of the experiment and dipped over the side of a boat at seven locations around the recorders during the other half. During this talk, ambient noise and environmental measurements will be presented along with acoustic localization results.

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Stricklin, D., D. Wilkinson, E. Arvidsson, L. Prud’homme-Lalonde, E. Thorleifson, D. Mullins, and S. Lachapelle. "An initial limited biodosimetry inter-comparison exercise: FOI and DRDC Ottawa." Radiation Measurements 42, no. 6-7 (July 2007): 1133–37. http://dx.doi.org/10.1016/j.radmeas.2007.05.043.

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Mohammadi, Razieh, and Zahra Shirmohammadi. "DRDC: Deep reinforcement learning based duty cycle for energy harvesting body sensor node." Energy Reports 9 (December 2023): 1707–19. http://dx.doi.org/10.1016/j.egyr.2022.12.138.

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Stredulinsky, David C., and Eric M. Thornhill. "Ship Motion and Wave Radar Data Fusion for Shipboard Wave Measurement." Journal of Ship Research 55, no. 02 (June 1, 2011): 73–85. http://dx.doi.org/10.5957/jsr.2011.55.2.73.

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Defence Research and Development Canada (DRDC) Atlantic has conducted many dedicated seakeeping and structural load trials on the Canadian Navy research ship CFAV Quest and on several Canadian Navy warships. Typically, wave buoys have been deployed to measure seaway wave characteristics; however, there has been an ongoing interest in evaluating shipboard wave measurement systems. These systems have some advantages over wave buoys for short-term trials and are needed for longer-term sea trials and to provide wave input data for tactical and real-time ship operator guidance systems. This paper presents some of our experiences with wave radar. In the last few years there have been significant advances in wave radar technology (systems that extract wave data from backscatter information contained in the video output of X-band navigational radar displays). Commercial "off-the-shelf" systems are now available. While there is evidence that these systems can provide reliable wave data from shore-based or stationary platform installations, it is DRDC's experience on a ship moving in waves, that wave radars can give good direction and frequency measurements but less reliable wave heights. DRDC has developed a method to improve shipboard wave height measurement through fusion of wave radar data with measured ship motion response data. This paper discusses the development of the wave data fusion process, validated through previous sea trial data, and presents the results of a recent demonstration of the approach during a sea trial conducted on CFAV Quest in November/December 2008.

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Gui, Long, Kangkang Song, Douglas Tritschler, Raqual Bower, Si Yan, Aguang Dai, Katherine Augspurger, et al. "Scaffold subunits support associated subunit assembly in the Chlamydomonas ciliary nexin–dynein regulatory complex." Proceedings of the National Academy of Sciences 116, no. 46 (October 28, 2019): 23152–62. http://dx.doi.org/10.1073/pnas.1910960116.

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The nexin–dynein regulatory complex (N-DRC) in motile cilia and flagella functions as a linker between neighboring doublet microtubules, acts to stabilize the axonemal core structure, and serves as a central hub for the regulation of ciliary motility. Although the N-DRC has been studied extensively using genetic, biochemical, and structural approaches, the precise arrangement of the 11 (or more) N-DRC subunits remains unknown. Here, using cryo-electron tomography, we have compared the structure of Chlamydomonas wild-type flagella to that of strains with specific DRC subunit deletions or rescued strains with tagged DRC subunits. Our results show that DRC7 is a central linker subunit that helps connect the N-DRC to the outer dynein arms. DRC11 is required for the assembly of DRC8, and DRC8/11 form a subcomplex in the proximal lobe of the linker domain that is required to form stable contacts to the neighboring B-tubule. Gold labeling of tagged subunits determines the precise locations of the previously ambiguous N terminus of DRC4 and C terminus of DRC5. DRC4 is now shown to contribute to the core scaffold of the N-DRC. Our results reveal the overall architecture of N-DRC, with the 3 subunits DRC1/2/4 forming a core complex that serves as the scaffold for the assembly of the “functional subunits,” namely DRC3/5–8/11. These findings shed light on N-DRC assembly and its role in regulating flagellar beating.

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LAVOIE, HUGO, ELDON PUCKRIN, and JEAN-MARC THÉRIAULT. "DETECTION AND IDENTIFICATION OF TOXIC CHEMICAL VAPORS IN AN OPEN-AIR ENVIRONMENT BY A DIFFERENTIAL PASSIVE LWIR STANDOFF TECHNIQUE." International Journal of High Speed Electronics and Systems 18, no. 02 (June 2008): 457–68. http://dx.doi.org/10.1142/s0129156408005485.

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In this paper, the passive standoff long wave infrared technology developed for atmospheric remote sensing was used to detect and identify chemical pollutants in the atmosphere. The measurement approach is based on the differential passive standoff detection method that has been developed by DRDC Valcartier during the past few years. The measurements were performed on real chemical warfare agents and toxic chemical vapors. The results clearly demonstrate the capability of the differential radiometry approach for the detection, identification and quantification of toxic chemical vapor clouds in an open-air environment.

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Shon, Tae Seok, Sang Dan Kim, Mi Eun Kim, Jae Beom Park, Kyung Sok Min, and Hyun Suk Shin. "Developing delivery ratio duration curve (DRDC) based on SWAT modeling in Nakdong river basin." DESALINATION AND WATER TREATMENT 38 (2012): 354–63. http://dx.doi.org/10.5004/dwt.2012.3590.

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Shon, Tae Seok, Sang Dan Kim, Mi Eun Kim, Jae Beom Park, Kyung Sok Min, and Hyun Suk Shin. "Developing delivery ratio duration curve (DRDC) based on SWAT modeling in Nakdong river basin." Desalination and Water Treatment 38, no. 1-3 (January 2012): 306–15. http://dx.doi.org/10.1080/19443994.2012.664389.

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Більше джерел

Дисертації з теми "DRDC8"

Bell, Francesca Y. "Copper tolerance of Listeria monocytogenes strain DRDC8." Thesis, 2010. http://hdl.handle.net/2440/65482.

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Listeria monocytogenes is one of the most important food-borne pathogens due to the severity of the disease it can cause. While the virulence factors required for effective colonisation and infection of mammalian hosts have been well described, other genes may modulate disease persistence. For L. monocytogenes strain DRDC8, the ctpA gene encodes a copper transporting P-type ATPase that apparently maintains intra-cellular copper ion homeostasis (Francis & Thomas, 1997a) and is also required for persistent infection of the liver and spleens of mice (Francis & Thomas, 1997b). However, the distribution of this gene is apparently limited to non-clinically derived environmental L. monocytogenes isolates (Bell, 2002). This may be explained by carriage of ctpA on plasmid DNA (Bell, 2002). Based on predictions of function and proximity to the ctpA gene (pCT0020), ORFs pCT0017, pCT0018, pCT0019 and ctpA were identified as a putative a cop-like operon involved in copper ion transport in L. monocytogenes (Bell, 2002). Southern hybridisation analysis was used to confirm that the ctpA gene is carried on plasmid pCT100 in strain DRDC8. In addition, evidence to suggest that ctpA was encoded by bacteriophage DNA was not obtained. Furthermore, sequence analysis of DNA flanking ctpA identified ORFs that encode polypeptide sequences similar to proteins involved in plasmid replication and other plasmid-associated functions. Mating experiments provided evidence to show that plasmid pCT100 is not conjugative. This suggested that lateral transfer of this plasmid between cohabitating organisms may be limited. Sequence analysis of a 37.279 kbp region of plasmid pCT100 from L. monocytogenes strain DRDC8 (GenBank Accession U15554) showed this plasmid had regions of gene content and organisation similar to that of other characterised Listeria plasmids, particularly plasmid pLI100 from L. innocua CLIP11262 and plasmid pLM80 from L. monocytogenes strain 4b H7858. Gene’s common to these plasmids included those implicated in plasmid DNA replication, DNA transposition/insertion and heavy metal (cadmium) transport. Sequence analysis of plasmid pCT100 also identified regions of DNA absent from other Listeria sequences. For example, a DNA region encoding a series of polypeptide sequences similar to chromosomally-encoded proteins involved in copper transport in other Gram-positive bacteria was identified. The ORFs encoded by this region (pCT0017, pCT0018, pCT0019 and pCT0020 (ctpA), pCT0023, pCT0024, pCT0025, pCT0026, pCT0027) represent a novel cluster of genes implicated in copper homeostasis/tolerance that had not been previously described for other Listeria spp. PCR analysis was used to show that carriage of this copper gene cluster may be restricted to only some Australian ctpA positive L. monocytogenes isolates, typically of dairy and poultry origin. In addition to these plasmid-encoded ORFs, PCR and sequence analysis identified a chromosomal ORF (cutR) also implicated in copper homeostasis/tolerance for strain DRDC8. cutR encodes a polypeptide similar to chromosomally-encoded coppertranslocating P-type ATPases from other Listeria species. The role of ORFs cutR, pCT0017, pCT0018 and pCT0019 in copper tolerance was assessed by comparison of the ability of wild type parent strain DRDC8 and variants containing independent mutations (pCT0017::erm, pCT0018::erm, pCT0019::erm or cutR::erm) to tolerate copper ion stress. The impact of loss of these genes (as a result of curing strain DRDC8 and cutR::erm derivatives of plasmid pCT100) on copper tolerance by DRDC8 was also examined. Minimal inhibitory concentration (MIC) and growth experiments showed that inactivation of cutR, pCT0018 or pCT0019, or removal of plasmid-encoded genes by curing DRDC8 of plasmid DNA, had a significant effect on copper tolerance. In addition, loss of plasmid DNA combined with disruption of cutR was shown to render cells completely incapable of growth in high levels of copper (14 mM CuSO4). This data indicated that pCT0018, pCT0019 and cutR are involved in copper tolerance of L. monocytogenes strain DRDC8. MIC experiments also provided evidence to show that ORFs cutR and pCT0018 may play an additional role in tolerance to cadmium. Interestingly, a L. monocytogenes mutant carrying an erm insertion within pCT0017 could not be constructed. However, evidence that showed that ORF pCT0017 encodes a CopY-like negative repressor protein directly implicated this ORF in copper tolerance. DNA gel shift experiments were used to show that pCT0017 protein binds to two ‘cop box-like’ nucleotide sequences located upstream of the pCT0017 translation start site. Binding occurs in a copper-dependant manner that is consistent with published models of CopY-like protein function. Thus pCT0017 protein may regulate expression of ORFs pCT0017, pCT0018, pCT0019 and ctpA in a copper responsive manner. This is consistent with the view that these ORFs form a cop-like operon involved in copper homeostasis. In conclusion, L. monocytogenes strain DRDC8 displayed an exceptional tolerance to high concentrations of copper ions. The data obtained suggested that both chromosomal and plasmid-encoded genes are involved in copper homeostasis/tolerance of DRDC8. This particular strain may have acquired multiple genes involved in copper tolerance from a cohabitating Gram-positive bacterium in response to exposure to high levels of copper within the environment. Given that strain DRDC8 is an Australian dairy isolate, these genes may provide a selective advantage for survival of other L. monocytogenes strains in associated environments.
Thesis (Ph.D.) -- University of Adelaide, School of Molecular and Biomedical Science, 2010

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Hii, Mei Mei. "Role of ORF pCT0018 for copper homeostasis in Listeria monocytogenes strain DRDC8." 2009. http://hdl.handle.net/2440/57906.

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Sequence analysis of part of a large plasmid carried by Australian environmental isolate of Listeria monocytogenes strain DRDC8 has lead to identification of an islet of genes that encode proteins similar to copper binding and transport genes found in other Gram positive bacteria. Comparative sequence analysis showed that there are at least four genes (pCT0017, pCT0018, pCT0019 and ctpA) on this islet predicted to be involved in copper homeostasis. One of these, ctpA, is predicted to encode a P-type ATPase with a function analogous to CopA, a copper transporting gene in Enterococcus hirae. ORF pCT0017 is likely to be a CopY-like regulatory protein which could control the expression of ctpA. ORF pCT0019 is predicted to be a Cu²⁺ binding protein. In addition, two genes located downstream of the ctpA are predicted to encode a two component regulatory system region. The predicted function of ORF pCT0018 is not clear. A related chromosomal gene (cutR) is predicted to also encode a copper transporting P-type ATPase. To investigate the role of the protein encoded by pCT0018, the growth behavior of L. monocytogenes strain DRDC8, other strains carrying mutations within pCT0018, pCT0019, cutR and ctpA, as well as strains cured of the large plasmid, were grown under conditions of copper stress and starvation. The growth data showed that with the exception of strain DRDC8 and other strains carrying ctpA, most were unable to grow at higher copper concentration (>15 mM CuSO₄) and suggested that the copper homeostasis genes located on the large plasmid are associated with tolerance to high levels of copper. Strain DSE955PL, which carries a cutR mutation and is cured of the large plasmid, was the most sensitive (<5 mM CuSO₄). This indicated that proteins encoded by plasmid genes work synergistically to confer tolerance to copper. Of most interest was the fact that a pCT0018 mutant was more sensitive (<15 mM CuSO₄) to high levels of copper than the wild type parent DRDC8 (<20 mM CuSO₄). This suggested that ORF pCT0018 was necessary for copper tolerance. To investigate the effects of insertion mutations in pCT0017, pCT0018 and ctpA on copper uptake and export, the levels of copper accumulated by these strains was assessed using atomic absorption spectroscopy. A significant difference in copper accumulation among the bacteria strains was observed when either LEB or BHI media were used to culture the bacteria. This data suggested that the growth medium chemicals influence the levels of copper accumulated by cells. However, the effect of these media on bacteria growth rates during copper stress was not significant. Atomic absorption analysis of intracellular copper accumulation suggested that DSE955PL and DSE955 (a chromosome mutant) were able to accumulate copper (80 - 110 mg.gˉ¹ dry weight of cells), whereas DRDC8 and strains carrying mutations in pCT0018, ctpA, and strains cured of the large plasmid, were less able to accumulate copper (30 - 70 mg.gˉ¹ dry weight of cells). This data suggested that cutR may encode a copper export system and that ctpA is involved in copper uptake. To investigate the gene expression profile for pCT0018 under elevated copper, reverse transcriptase PCR was used to detect transcripts encoding pCT0017, pCT0018, pCT0019 and pCT0020 from RNA extracted from L. monocytogenes strain DRDC8 following culture at elevated levels of copper. Although transcripts for each of the target genes were detected, transcription was not responsive to copper, nor was the pattern of transcription consistent with that expected for a single operon. To directly determine whether the protein encoded by the pCT0018 open reading frame was able to bind copper, this gene was cloned in pET15b in frame with an N-terminal Histag and expressed in E. coli. The expressed protein was purified with a Ni-NTA column and shown to contain copper. Attempts to directly show that protein pCT0018 could bind copper by Cu-IMAC were unable to unequivocally show that the protein was immobilized on the column. Purified protein was used to raise a polyclonal antiserum in rabbit and the antiserum was used for Western analysis to test expression of pCT0018 by wild type L. monocytogenes DRDC8 and specific gene mutants. Although the antiserum bound to purified protein, it was not possible to demonstrate binding to native pCT0018 in cell lysates prepared from L. monocytogenes DRDC8. SDS-PAGE of cytoplasmic and cell envelope proteins isolated from L. monocytogenes strains was used to identify proteins expressed in response to copper stress and starvation. No significant differences in protein profiles for cytoplasmic protein were observed. However, copper-immobilized metal affinity chromatography (Cu-IMAC) showed that expression of a number of copper binding proteins were differentially expressed by DRDC8 following growth in copper stress and starvation conditions. Three of these proteins were selected for amino sequence analysis by MALDI-TOFF MS. Two were confirmed to be L. monocytogenes non-heme iron-binding ferritin and a thiol peroxidase, both of which bind copper. The other protein was similar to an unknown protein from L. monocytogenes. Interestingly, no proteins directly implicated with the copper homeostasis islet were identified.
http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1374407
Thesis (M.Sc.) - University of Adelaide, School of Molecular and Biomedical Science, 2009

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Книги з теми "DRDC8"

Kellaway, Roy, and Tim Harrington. Feeding Concentrates. CSIRO Publishing, 2004. http://dx.doi.org/10.1071/9780643091047.

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This book presents strategies for feeding energy and protein supplements to pasture-fed dairy cows and examines the potential economic benefits. Effective supplementary feeding of concentrates is critical to the success of all dairy farms. This book is a substantially revised edition of 'Feeding Concentrates: Supplements for Dairy Cows' DRDC 1993. It focuses on feeding concentrates to pasture fed cows to achieve high milk production per cow per hectare, and will assist farmers to decide which supplements give the best results in their particular situation. The benefits that arise from supplementary feeding include higher stocking rates, promotion of growth in heifers and young cows; better body condition score and increased lactation length when pasture is less available; improved pasture use; reduced cost per tonne of pasture eaten; flexibility to increase milk production when milk prices are high; and increased milk protein content when the energy content in pasture is low. This edition has thoroughly reviewed the issues and clearly documents the results of research particularly for grains supplementation. The summaries and recommendations in each chapter will be particularly helpful to dairy farmers in making best management decisions relating to concentrate feeding.

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Тези доповідей конференцій з теми "DRDC8"

Ellis, Dale D., John Preston, and Gary H. Brooke. "Progress on the DRDC clutter model." In ECUA 2012 11th European Conference on Underwater Acoustics. Acoustical Society of America, 2013. http://dx.doi.org/10.1121/1.4813103.

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MacKay, John R., Malcolm J. Smith, and Neil G. Pegg. "Design of Pressure Hulls Using Nonlinear Finite Element Analysis." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92591.

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Through the use of nonlinear finite element analysis (NLFEA), submarine pressure hull designs could potentially be based on calculated limit states that include the full geometric complexity of the structure, and real-world effects such as build imperfections. In addition, NLFEA could provide a rational means of assessing the effects of in-service damage on structural performance. Analysis of pressure hulls using 3D NLFEA is not currently supported in design codes, primarily because the uncertainty regarding the accuracy of the method has not been quantified. Defence Research and Development Canada (DRDC), the R&D branch of the Canadian Navy, is undertaking work to develop a partial safety factor for 3D NLFEA of pressure hulls, by comparison of numerically calculated collapse pressures to experimental results. Data from experiments previously conducted at various institutions will be augmented by a pressure hull testing program currently being undertaken by a joint project of DRDC and the Ministry of Defence of the Netherlands. The development of NLFEA modeling and analysis guidelines, as well as a revised design/analysis procedure, will be discussed, as well as a history of the DRDC submarine structures research program.

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Legault, S. R. "An overview of the DRDC Ottawa RCS measurement system." In 2004 10th International Symposium on Antenna Technology and Applied Electromagnetics and URSI Conference. IEEE, 2004. http://dx.doi.org/10.1109/antem.2004.7860645.

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Clenet, Michel, Mathieu Caillet, and Yahia M. M. Antar. "Wideband circularly polarized antenna elements for GPS/GNSS applications developed at DRDC Ottawa." In the American Electromagnetics Conference (AMEREM). IEEE, 2010. http://dx.doi.org/10.1109/antem.2010.5552561.

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Clenet, Michel, and Slobodan Jovic. "A review of research on GNSS antenna technologies at DRDC Ottawa Research Centre." In 2016 17th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM). IEEE, 2016. http://dx.doi.org/10.1109/antem.2016.7550203.

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Sévigny, Pascale, David J. DiFilippo, Tony Laneve, Brigitte Chan, Jonathan Fournier, Simon Roy, Benoît Ricard, and Jean Maheux. "Concept of operation and preliminary experimental results of the DRDC through-wall SAR system." In SPIE Defense, Security, and Sensing, edited by Kenneth I. Ranney and Armin W. Doerry. SPIE, 2010. http://dx.doi.org/10.1117/12.849709.

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Chan, Brigitte. "Contourlet domain hidden Markov tree based detection algorithm for DRDC through-wall SAR (TWSAR) system applications." In SPIE Defense, Security, and Sensing, edited by Edmund G. Zelnio and Frederick D. Garber. SPIE, 2010. http://dx.doi.org/10.1117/12.850770.

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Lavoie, Hugo, François Bouffard, Eldon Puckrin, and Jean-Marc Thériault. "Standoff detection of hazardous gas in open environments, two decades of R&D activities at DRDC." In Hyperspectral Imaging and Sounding of the Environment. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/hise.2021.hf2i.2.

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Seto, Mae L. "Platform Protection Through Acoustic Signature Management." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13724.

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A naval ship's acoustic signature is known after a ranging but changes the longer it is in-service away from a range. The Ship Signatures Management System (SSMS) provides an organic real-time capability to predict their own signature and enough information to mitigate signature issues. SSMS provides the Commanding Officer with a tool to determine the ship's acoustic signature in order to evaluate the impact of his/her proposed actions on the ship's counter-detection range and sensor performance. In this manner, the ship's protection is enhanced through insightful and timely signature management. DRDC has upgraded the SSMS hardware to state-of-the-art components to increase the number of sensors, the fidelity of the logged data, the dynamic range, and the processing power. This paper discusses some of the advanced SSMS features developed like tonal detection and tracking, tonal association, and the diagnostics used to determine the cause of features in the acoustic signature.

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Macfarlane, Gregor J., Nicholas T. M. Johnson, Lauchlan J. Clarke, Ross J. Ballantyne, and Kevin A. McTaggart. "The Floating Harbour Transhipper: New-Generation Transhipment of Bulk Ore Products." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41337.

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Bulk products such as iron ore and coal are usually shipped directly from shore facilities using large bulk carriers. This often involves significant cost due to major dredging operations, long jetties, large storage sheds and the acquisition of large tracts of coastal land. The costs of direct shore to an ocean-going export vessel (OGV) loading often run into billions of dollars — prohibitive for small- to medium-scale mining operations, particularly in remote regions with only distant access to deep water ports. The current industry standard for mitigating these issues is transhipping; the bulk cargo is transported from a smaller shore based facility to the export vessel moored in deep water by a small feeder vessel. Transhipment, while mitigating many of these issues, does introduce other concerns with respect to limiting seastate, environmentally harmful dust and potential spillage during materials transfer. The Australian company Sea Transport Corporation and the Australian Maritime College at the University of Tasmania are developing new technology for bulk ore transhipment: the floating harbour transhipper (FHT). The FHT is essentially a large floating warehouse with an aft well dock to support material transfer operations from the feeder vessel. The major advantages to the mining export industry are in the form of environmental and economic improvements, in some cases completely avoiding expensive dredging while minimising the environmentally invasive onshore infrastructure. In addition, the whole process is enclosed, therefore eliminating grab spillage and dust transport issues common to other transhipping methods. This paper presents an overview of the main hydrodynamic issues currently being investigated: primarily the interaction between multiple floating bodies close to one another in a seaway. The two primary ship-to-ship interactions that are being investigated are the effects experienced by the feeder vessel when it is docking or undocking within the FHT well dock and the interactions between the three vessels when operating in close proximity in an open seaway. A combination of physical scale model experiments and numerical techniques is employed, with a significant portion of the experimental program dedicated to the validation of the numerical simulation codes used to investigate the behaviour of the vessels. ShipMo3D is an object based library developed by DRDC for the purpose of analysing the seakeeping performance of vessels operating in a seaway in either the frequency or time domain. The capabilities of ShipMo3D are applied to this novel application in an attempt to provide realistic simulations of the interaction between the vessels of the FHT system. DualSPHysics, an open source Smoothed Particle Hydrodynamics (SPH) code, is being applied to the domain within the very restricted water environment of the FHT well dock to investigate the fluid flow behaviour and the effect that this has on the feeder vessel when entering/exiting.

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Звіти організацій з теми "DRDC8"

Paul, C., and J. F. Cassidy. Seismic hazard investigations at select DND facilities in Southwestern British Columbia: subduction, in-slab, and crustal scenarios. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331199.

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Southwest British Columbia has some of the highest seismic hazard in Canada and is home to facilities owned by the Department of National Defence which support operations on the west coast of Canada. The potential impact of seismic hazards on these government facilities are investigated here. The hazard is from three primary sources: subduction interface, crustal and in-slab earthquakes. NRCan, in consultation with DRDC have produced representative earthquake scenarios for each of these sources. The subduction scenario we constructed was an M8.9 earthquake extending along the entire Cascadia Subduction Zone from 4 to 18 km depth. We used an M6.8 earthquake occurring along a 30 km fault at between 52 and 60 km depth below Boundary Bay to represent in-slab events. The final scenario, representing a crustal source, was an M6.4 along the central 47 km of the Leech River Valley-Devil's Mountain Fault system. We found that the Cascadia subduction scenario dominated the shaking hazard over much of the study region. Meanwhile, the in-slab and crustal scenarios have higher but more localized hazards in Vancouver and Victoria. In addition to the primary ground motion hazard, we also examined secondary seismic hazards: secondary amplification effects, landslides, liquefaction, surface ruptures, tsunami, flooding, fire, and aftershocks. Each of the secondary hazards had varying impacts depending on the scenario and locations within the region.

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