175 research outputs found
Indium Interdiffusion in CdTe/InSb Heterostructures Studied by Optical and Surface Analytical Techniques
No full textA multi-technique study of the surface preparation of InSb substrate and subsequent grown CdTe films by molecular beam epitaxy
No full textA photoluminescence study of molecular beam epitaxy grown CdTe films on (001) InSb substrates
No full textPerformance Analysis of Farrow Structure Based FBMC-OQAM System
No full textAbstractFarrow structure is used in the efficient implementation of high order filters. The number of unknown coefficients is much less in Farrow structure based implementation, in comparison with the direct form implementation of FIR filters. Some predefined multipliers can also be used in this method. Since they are known apriori they will not add much to the complexity of the system. It is seen that a relatively strong correlation exists among the adjacent impulse response coefficients of the frequency selective filters. This fact is exploited in the Farrow structure to reduce the number of multipliers required for the implementation of desired filter. And these Farrow coefficients are used for representing the polyphase components of the desired filter. This Farrow structure based prototype filter is used for implementing an FBMC-OQAM system. BER performance of Farrow structure based FBMC-OQAM system is studied and found comparable with that of existing FBMC-OQAM system
Seward's folly: a new look at the Alaska Purchase
No full textIncludes bibliographical references and index.The Alaska Purchase--denounced at the time as 'Seward's Folly' but now seen as a masterstroke--is well known in American history. But few know the rest of the story. Lee Farrow offers a detailed account of just what the Alaska Purchase was, how it came about, its impact at the time, and more. Farrow shows why both America and Russia had plenty of good reasons to want the sale to occur, including Russia's desire to let go of an unprofitable, hard-to-manage colony and the belief in the United States that securing Alaska could help the nation gain control of British Columbia and generate closer trade ties with Asia . Farrow also delves into the implications of the deal for foreign policy and international diplomacy far beyond Russia and the United States at a moment when the global balance of power was in question.--Provided by publisher.Some mysterious sympathy: the foundations of friendship -- Evident advantages: origins and objectives -- Seward's chimerical project: public reaction and ratification -- No longer Russian America: taking possession of Alaska -- Paying for the "new national ice-house": approval and appropriation -- Very uneasy and vexed: international reactions to the purchase -- That snow-bound wilderness: from treaty to territory
MBE Growth of Artificially-Layered Magnetic Metal Structures on Semiconductors
No full textAbstractIn this review, recent developments in MBE growth of artificially-layered magnetic metal structures on semiconductor substrates are considered. It is seen that the ability to seed specific orientations of such structures and to probe their structural and chemical properties with a variety of in situ probes are key advantages of MBE over more conventional deposition techniques.</jats:p
Distribution of Salmonella serovars in breeding, nursery, and grow-to-finish pigs, and risk factors for shedding in ten farrow-to-finish swine farms in Alberta and Saskatchewan
No full textThe study objectives were to investigate Salmonella prevalence, serovar distribution, and risk factors for shedding in 10 purposively selected farrow-to-finish farms in Saskatchewan and Alberta. Pooled fecal samples from the breeding and growfinish phases and individual fecal samples from breeding, nursery, and grow-finish pigs were cultured for Salmonella; serotyping of isolates was performed. Pig and pen characteristics were recorded for each pig and pen sampled. Overall, 407/1143 (36%) of samples were Salmonella positive; within-farm prevalence ranged from 1% to 79%. Sows, nursery, and grow-finish pigs accounted for 43%, 29%, and 28% of positive samples, respectively. More Salmonella were detected in pooled pen than individual pig samples (P<0.001). Among 418 Salmonella isolates, there were 19 distinct serovars; the most common were S. Derby (28.5%), S. Typhimurium, var. Copenhagen (19.1%), S. Putten (11.8%), S. Infantis (6.8%), and S. Mbandaka (6.1%). Sows were more likely to shed Salmonella than nursery or grow-finisher (OR 2.9, P<0.001) pigs. Pelleted feed (OR 8.2, P<0.001) and nose-to-nose pig contact through pens (OR 2.2, P=0.005) were associated with increased Salmonella prevalence. Significant differences in serovar distribution were detected among production phases. The use of pooled pen samples is recommended as a more efficient means for accurate evaluation of Salmonella status in different phases of pig production. The breeding herd might be an important source of Salmonella persistence within farrow-to-finish farms and should be targeted in control efforts. The latter might also apply to the use of pelleted feed, which remains the most consistently reported significant risk factor for Salmonella shedding in pigs.Accession Number: 20103196664. Publication Type: Journal Article. Language: English. Language of Summary: French. Number of References: 32 ref. Subject Subsets: Veterinary Science; Veterinary Science; Animal Nutrition; Pig Scienc
Orientational dependence of oscillatory exchange coupling
No full text\u3cp\u3eThe role of the interlayer Fermi surface in driving oscillatory exchange coupling of ferromagnetic layers has been critically tested in a series of MBE-grown coherent epitaxial sandwiches prepared on single-crystal substrates. The wedge-shaped Cu (or Cu-based) interlayers have been modified in a number of different ways, achieving orientational, compositional and structural alteration of the Cu Fermi surface. Observed phenomena include multiperiodic coupling oscillations in both the ferromagnetically and antiferromagnetically coupled regions.\u3c/p\u3
Magnetic and transport behavior of Af-coupled layers with a limited number of repetitions
No full text\u3cp\u3eWe investigated the magnetization behavior of [(Co/Pd)4-Ru]x samples with perpendicular anisotropy and a limited number of repetitions (x=1,..22). In these systems the Co/Pd multilayers behave as single magnetic entices. A detailed analysis and comparison of the magnetization curves observed by MOKE and VSM permits us to observe the magnetization reversal and hysteresis of the individual layers and to determine the antiferromagnetic coupling J between each pair of layers. A gradual increase in J is observed in all samples when going from the bottom layer to the top layer. Magnetoresistance curves show the same sharp transitions as the magnetization curves. A clear distinction can be made between an outer layer and an inner layer. These results will be compared with model calculations.\u3c/p\u3
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