101,027 research outputs found
Numerical simulations of strong wind situations near the Mediteranean French Coast: comparison with FETCH data
No full textA detailed analysis is made of some typical strong wind situations near the French Mediterranean coast. Special attention has been paid to the wind from the north-northwest in the Gulf of Lion, also called the mistral. The analysis is made from both the synoptic and mesoscale point of view with the aid of numerical simulations carried out with the Regional Atmospheric Modeling System (RAMS) to study the main atmospheric, climatic, and meteorological characteristics of this wind in the Gulf of Lion. Simulations were made with this model during the periods of 20-22 March and 24-26 March 1998. Afterward, a comparison was made with the meteorological measurements collected during the international Flux, Etat de la Mer et Te´le´de´tection en Condition de Fetch Variable (FETCH) campaign (Gulf of Lion, March-April 1998). The comparison between the simulated wind fields and the values measured by the coastal meteorological stations, an oceanographic buoy, and the ship Atalante at sea help to give full understanding of the complicated physical processes that characterize strong wind situations in coastal zone
fetch (n)
No full textfetch nShe used to . . . lots o' people see her beatin' in here under sail, you know, this . . . schooner, the fetch or whatever you call it. Now I never see nothing like that. Still, I suppose it can happen. (ie "forerunner" of death. Phantom ship as omen of death. In this case the ship appears after the men were lost, so does not foretell the disaster, though in a sense warns of the deaths or notifies them by appearing in the area at all.) [see 'fetch' (X-ed out) 'forerunner']YesDNE-citJ.D.A. WIDDOWSONUsed IUsed I2Used I[see 'forerunner'
Inheritance of resistance to oat stem rust in the cultivars Ronald and AC Gwen
No full text Mitchell Fetch, J. and Fetch Jr., T. 2011. Inheritance of resistance to oat stem rust in the cultivars Ronald and AC Gwen. Can. J. Plant Sci. 91: 419–423. Oat stem rust, caused by Puccinia graminis Pers. f. sp. avenae Eriks. and E. Henn., causes sporadic epidemics and yield losses in Manitoba and eastern Saskatchewan. Oat (Avena sativa L.) cultivars registered for production in this area possess resistance to stem rust, but their genetic composition is unknown. Race TJJ (NA67), first detected in 1998, is virulent on most Pg genes; thus, it is desirable to know the gene(s) that are present in currently grown oat varieties. The hulled cultivar Ronald and the hulless cultivar AC Gwen were selected for characterization of inheritance of stem rust resistance, and crossed to the susceptible cultivar Triple Crown. Race BLD (NA1) was used to evaluate F1 plants and F2 populations. All F1 plants were resistant, indicating the presence of at least one dominant gene. Pooled F2 populations fit a 13:3 (resistant:susceptible) ratio for both Ronald (χ2 =0.31, P =0.58) and AC Gwen (χ2 =3.32 and P =0.07), indicating the presence of one dominant and one recessive gene. Segregation ratios in pooled F3 families fit a 7:8:1 (homozygous resistant:segregating:homozygous susceptible) ratio with race BLD (χ2 =0.84, P =0.66 for Ronald; χ2 =1.99, P =0.37 for AC Gwen), a 1:2:1 ratio (segregating families with 1:3 ratio) with race TJD (χ2 =2.87, P =0.24 for Ronald; χ2 =3.45, P =0.18 for AC Gwen), and a 1:2:1 ratio (segregating families with 3:1 ratio) with race FDJ (χ2 =1.33, P =0.51 for Ronald; χ2 =2.04, P =0.36 for AC Gwen). These results and reactions to known races of Puccinia graminis f. sp. avenae indicate that both Ronald and AC Gwen possess the dominant gene Pg2 and recessive gene Pg13. This genetic study characterized the stem rust resistance in Ronald and AC Gwen, and confirmed the limited base of stem rust resistance in Canadian oat cultivars. </jats:p
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Cacheless instruction fetch mechanism for multithreaded processors
No full textThe speed difference between processors and memories has become to one of the biggest problem in designing memory systems. While this primarily limits fast sequential access to data in memory it also sets constraints to efficient instruction fetch. In computers using single threaded processors this latter problem has traditionally been partially solved by using instruction caches, but in fast multithreaded processors supporting a large number of threads the problem is more difficult, because each thread can execute the program from an unique address (MIMD-style) or all threads can just access the same location synchronously (SIMD-style). In this paper we propose two cacheless instruction fetch mechanisms for multithreaded processors composed of an interthread pipelined instruction fetch unit and a banked instruction memory module using randomized hashing, combining and partitioning. The proposed mechanisms along with a two reference mechanisms based on direct mapped and T-way set associative caching are evaluated in a T-threaded case by simulations. According to our evaluation the proposed mechanisms solve efficiently the speed difference problem and provide clearly better performance than the reference solutions
Reynolds-stress enhancement associated with a short fetch of roughness in wall turbulence
No full textParticle-image velocimetry experiments are performed to study the response of smooth-wall turbulent channel flow to a short fetch of roughness (ten outer length scales long). The roughness studied herein is replicated from a surface scan of a damaged turbine blade and contains both large- and small-scale surface defects attributable to pitting, deposition and spallation. Quadrant analysis is used to investigate the characteristics of Reynolds-stress-producing events within the internal layer that develops over the roughness. The total mean Reynolds stress is dramatically increased in the presence of the roughness as compared to the smooth-wall baseline owing to an increased number of extremely intense ejections and sweeps. In contrast, inward and outward interactions, as well as relatively weak ejection and sweep events, are found to be insensitive to the surface conditions. While the stress and space fractions for all Reynolds-stress-producing events are found to be insensitive to the surface topology, the most intense ejection and sweep events yield stress and space fractions that vary significantly with the local surface topology.is peer reviewedSubmitted by Sarah Shreeves ([email protected]) on 2007-01-18T22:37:05Z
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Previous issue date: 2006-01published or submitted for publicatio
Voice Control of Fetch Robot Using Amazon Alexa
No full textWith the rapid development of computers and technology, virtual assistants (VA) are becoming more and more common and intelligent. However, virtual assistants, such as Apple's Siri, Amazon's Alexa, and Google Assistant, do not currently have any physical functions. As an important part of the internet of things (IoT), the field of robotics has become a new trend in the usage of VA. In this project, a mobile robot, Fetch, is connected with the Amazon Echo Dot through the Amazon web service (AWS) and a local robot operation system (ROS) bridge server. We demonstrated that the robot could be controlled by voice commands through an Amazon Alexa. Given certain commands, Fetch was able to move in a desired direction as well as track and follow a target object. The follow model was also learned by Neural Network training, which allows for the target position to be predicted in future maps.Master of ScienceNowadays, virtual personalized assistants (VPAs) exist everywhere around us. For example, Siri or android VPAs exist on every smartphone. More and more people are getting household Virtual Assistants, such as Amazon Alexa, Google Assistant, and Microsoft's Cortana. If the virtual assistants can connect with objects which have physical functions like an actual robot, they will be able to provide better services and more functions for humans. In this project, a mobile robot, Fetch, is connected with the Echo dot from Amazon. This connection allows us to control the robot by voice command. You can ask the robot to move in a given direction or track and follow a certain object. In order to let the robot learn how to predict the position of the target when the target is lost, a map is built as an influence factor. Since a designed algorithm of target position prediction is difficult to implement, we opted to use a machine learning method instead. Therefore, a machine learning algorithm was tested on the following model
Group mutual exclusion by fetch-and-increment
No full textThe group mutual exclusion (GME) problem (also called the room synchronization problem) arises in various practical applications that require concurrent data sharing. Group mutual exclusion aims to achieve exclusive access to a shared resource (a shared room) while facilitating concurrency among non-conflicting requests. The problem is that threads with distinct interests are not allowed to access the shared resource concurrently, but multiple threads with same interest can. In Blelloch et al. (2003), the authors presented a simple solution to the room synchronization problem using fetch&add (F&A) and test-and-set (T&S) atomic operations. This algorithm has O(m) remote memory references (RMRs) in the cache coherent (CC) model, where m is the number of forums. In Bhatt and Huang (2010), an open problem was posed: "Is it possible to design a GME algorithm with constant RMR for the CC model using fetch&addinstructions?" This question is partially answered in this article by presenting a group mutual exclusion algorithm using fetch-and-increment instructions. The algorithm is simple and scalable
Handwritten biographical information on Paulina T. McClung Merritt
No full textA handwritten biography of Paulina T. McClung Merritt by an unknown author, 1892.
Heterogeneous and tissue-specific regulation of effector T cell responses by IFN-gamma during Plasmodium berghei ANKA infection.
No full textIFN-γ and T cells are both required for the development of experimental cerebral malaria during Plasmodium berghei ANKA infection. Surprisingly, however, the role of IFN-γ in shaping the effector CD4(+) and CD8(+) T cell response during this infection has not been examined in detail. To address this, we have compared the effector T cell responses in wild-type and IFN-γ(-/-) mice during P. berghei ANKA infection. The expansion of splenic CD4(+) and CD8(+) T cells during P. berghei ANKA infection was unaffected by the absence of IFN-γ, but the contraction phase of the T cell response was significantly attenuated. Splenic T cell activation and effector function were essentially normal in IFN-γ(-/-) mice; however, the migration to, and accumulation of, effector CD4(+) and CD8(+) T cells in the lung, liver, and brain was altered in IFN-γ(-/-) mice. Interestingly, activation and accumulation of T cells in various nonlymphoid organs was differently affected by lack of IFN-γ, suggesting that IFN-γ influences T cell effector function to varying levels in different anatomical locations. Importantly, control of splenic T cell numbers during P. berghei ANKA infection depended on active IFN-γ-dependent environmental signals--leading to T cell apoptosis--rather than upon intrinsic alterations in T cell programming. To our knowledge, this is the first study to fully investigate the role of IFN-γ in modulating T cell function during P. berghei ANKA infection and reveals that IFN-γ is required for efficient contraction of the pool of activated T cells
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