排序方式: 共有28条查询结果,搜索用时 15 毫秒
21.
22.
23.
John Vicente Sanjay Rungta Gang Ding Dilip Krishnaswamy Winson Chan Kai Miao 《Communications Magazine, IEEE》2007,45(2):126-133
The communications industry significantly lags behind the personal computing industry in terms of empowering the end user to innovate, as fundamental architectural shifts have yet to occur to push intelligence to the network edge. The decentralization of the telecommunication system to the edge of today's hierarchically formed networks is inevitable with the emergence of key wireless technologies and the proliferation of mobile computing devices and more prevailing usage models. This article envisions a decentralized communication system formed of wireless mesh networks and a highly virtualized, converged computing and communications node-based architecture with emergent management capabilities. We propose to embed the user inside the network to freely associate services and resources such as computing, storage, and bandwidth to rapidly advance network innovation - network-centric computing. This article proposes a novel direction and vision for network-centric computing, expands upon our research, and presents the OverMesh platform from which we have begun work to instantiate this vision. Finally, we expect this new envisioned network to coexist with today's Internet infrastructure and enable a new generation of applications and usage models 相似文献
24.
Load Enhancement Factor (LEF) and similar statistical methods have been used for decades to reduce the time and cost associated with component-level fatigue testing on aerospace structures. The most common LEF approach was that developed by the Naval Air Development Corporation in the 1980s. Though considered an innovative and novel concept at its conception, this traditional method has a number of limitations that restrict its applicability to only a handful of testing scenarios. The objective of this study was to deal with those restrictions and offer a more comprehensive approach to account for modern advances in statistics, composite materials, and testing technology. The formulation of the new method uses the traditional LEF method as a foundation, but uses a revised set of notation and incorporates a modified Joint Weibull analysis technique to improve its potency. A detailed set of sample calculations using stochastically generated data illustrates how the computations are performed, thus allowing practitioners to reproduce the method using their own data. A short discussion also addresses some common misconceptions regarding the use of Load Enhancement Factors. 相似文献
25.
King F.D. Winson P. Snider A.D. Dunleavy L. Levinson D.P. 《Microwave Theory and Techniques》1998,46(9):1313-1314
Condition numbers expressing the sensitivity of computed circuit element values to inaccuracies in S-parameter measurements are derived and evaluated for a standard small-signal MESFET model. The condition numbers shed light on the common difficulty experienced by transistor modelers in extracting accurate values for the input resistance. Other elements are also classified according to their sensitivity 相似文献
26.
Two electrophoretically different forms of sterol ester hydrolase (EC 3.1.1.13) were obtained from the cytoplasmic extract
of the mycelia ofFusarium oxysporum. The entities, estimated at 60,000 (I) and 15,000 (II) molecular weights, were obtained in Sephadex G100 column chromatography
of the ammonium sulfate precipitate from the cytoplasmic extract. A third form III, 75,000 MW, was obtained from the culture
filtrate. The activity of the enzyme was increased by Triton X-100 and was not inhibited byp-chloromercuribenzoate (PCMB), a sulfhydryl reagent. The enzymes I and II were inhibited differentially by NaCl. The optimal
activities of forms I, II and III occurred at pH 4.8, pH 8.0 and pH 7.0, respectively. the apparent Km values of 7.7×10−5, 8.3×10−5 and 10.5×10−5, respectively, indicate a similar order of affinity for cholesteryl oleate at pH 7.1. The rate of hydrolysis of cholesteryl
esters were in the order: linoleate>oleate>valerate>butyrate > acetate. Cholesteryl benzoate and palmitate were not hydrolyzed.
The properties of the microbial enzyme are discussed in relation.
Contribution no. 1098. 相似文献
27.
Richard Matthews Michael Winson John Scullion 《The Science of the total environment》2009,407(8):2557-2564
Biological ammoniacal-nitrogen (NH4+-N) and organic carbon (TOC) treatment was investigated in replicated mesoscale attached microbial film trickling filters, treating strong and weak strength landfill leachates in batch mode at temperatures of 3, 10, 15 and 30 °C. Comparing leachates, rates of NH4+-N reduction (0.126-0.159 g m− 2 d− 1) were predominantly unaffected by leachate characteristics; there were significant differences in TOC rates (0.072-0.194 g m− 2 d− 1) but no trend relating to leachate strength. Rates of total oxidised nitrogen (TON) accumulation (0.012-0.144 g m− 2 d− 1) were slower for strong leachates. Comparing temperatures, treatment rates varied between 0.029-0.319 g NH4+-N m− 2 d− 1 and 0.033-0.251 g C m− 2 d− 1 generally increasing with rising temperatures; rates at 3 °C were 9 and 13% of those at 30 °C for NH4+-N and TOC respectively. For the weak leachates (NH4+-N < 140 mg l− 1) complete oxidation of NH4+-N was achieved. For the strong leachates (NH4+-N 883-1150 mg l− 1) a biphasic treatment response resulted in NH4+-N removal efficiencies of between 68 and 88% and for one leachate no direct transformation of NH4+-N to TON in bulk leachate. The temporal decoupling of NH4+-N oxidation and TON accumulation in this leachate could not be fully explained by denitrification, volatilisation or anammox, suggesting temporary storage of N within the treatment system. This study demonstrates that passive aeration trickling filters can treat well-buffered high NH4+-N strength landfill leachates under a range of temperatures and that leachate strength has no effect on initial NH4+-N treatment rates. Whether this approach is a practicable option depends on a range of site specific factors. 相似文献
28.
L Winson 《Canadian Metallurgical Quarterly》1997,6(21):1229-32, 1234, 1251-2
The complications arising from catheterization of the urinary bladder have been extensively researched and reviewed. It is widely accepted that, because of inherent risks, catheterization is a last resort in the management of urinary incontinence. However, anecdotal evidence suggests that the incidence of long-term catheterization for this purpose is increasing, particularly for the management of highly dependent patients in the community. Although catheterization is a common procedure, a high level of nursing knowledge and skill is required to achieve effective and safe management. This article reviews the principles of catheter management and the nurse's responsibility to the catheterized patient. 相似文献