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排序方式: 共有115条查询结果,搜索用时 15 毫秒
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In this paper, we study simultaneous external and internal stabilization of the linear system under input saturation and non-input additive sustained disturbances. For systems that are asymptotic null controllable with bounded control, it is shown that a nonlinear dynamic feedback controller can be designed so that the closed-loop states remain bounded for any initial condition and for two classes of sustained disturbances, and that the equilibrium in the absence of disturbances is globally asymptotically stable. 相似文献
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In this paper, we study the response to external disturbances of a double integrator with a saturating feedback. For a class of disturbances that have bounded integrals over all intervals, we show that a linear static feedback law can always be designed to ensure boundedness of the states. Moreover, boundedness can be preserved if the disturbance is biased by a small DC signal. In the special case that the disturbance is made up of a finite number of sinusoids and a small bias, any linear static feedback ensures boundedness of the states. These results are an extension of previous results by Wen, Roy, and Saberi (2008). 相似文献
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Strain‐induced deformation mechanisms of polylactide plasticized with acrylated poly(ethylene glycol) obtained by reactive extrusion 下载免费PDF全文
Kui Wang Berit Brüster Frédéric Addiego Georgio Kfoury Fatima Hassouna David Ruch Jean‐Marie Raquez Philippe Dubois 《Polymer International》2015,64(11):1544-1554
This work aimed at identifying the tensile deformation mechanisms of an original grade of plasticized polylactide (pPLA) obtained by reactive extrusion. This material had a glass transition temperature of 32.6 °C and consisted of a polylactide (PLA) matrix grafted with poly(acryl‐poly(ethylene glycol)) (poly(Acryl‐PEG)) inclusions. pPLA behaved like a rubber‐toughened amorphous polymer at 20 °C, and its tensile behavior evolved toward a rubbery semicrystalline polymer with increasing temperature. The drawing of pPLA involved orientation of amorphous and crystalline chains, crystallization, and destruction of crystals. It was found that crystal formation and crystal destruction were in competition below 50 °C, resulting in a constant or slightly decreasing crystallinity with strain. Increasing temperature enhanced crystal formation and limited crystal destruction, resulting in an increased crystallinity with the strain level. Drawing yielded a transformation of the initial spherical poly(Acryl‐PEG) inclusions into ellipsoids oriented in the tensile direction. This mechanism may engender the formation of nanovoids within the inclusions due to a decreased density, assumed to be responsible for the whitening of the specimen. © 2015 Society of Chemical Industry 相似文献
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Michael T. Arts Michelle E. Palmer Anne Berit Skiftesvik Ilmari E. Jokinen Howard I. Browman 《Lipids》2012,47(12):1181-1192
Temperature and ultraviolet B radiation (UVB 290–320?nm) are inextricably linked to global climate change. These two variables may act separately, additively, or synergistically on specific aspects of fish biochemistry. We raised Atlantic Salmon (Salmo salar) parr for 54?days in outdoor tanks held at 12 and 19?°C and, at each temperature, we exposed them to three spectral treatments differing in UV radiation intensity. We quantified individual fatty acid (FA) mass fractions in four tissues (dorsal muscle, dorsal and ventral skin, and ocular tissue) at each temperature?×?UV combination. FA composition of dorsal muscle and dorsal and ventral skin was not affected by UV exposure. Mass fractions of 16:0, 18:0, and saturated fatty acids (SFA) were greater in dorsal muscle of warm-reared fish whereas 18:3n-3, 20:2, 20:4n-6, 22:5n-3, 22:6n-3, n-3, n-6, polyunsaturated fatty acids (PUFA), and total FA were significantly higher in cold-reared fish. Mass fractions of most of the FA were greater in the dorsal and ventral skin of warm-reared fish. Cold-reared salmon exposed to enhanced UVB had higher ocular tissue mass fractions of 20:2, 20:4n-6, 22:6n-3, n-3, n-6, and PUFA compared to fish in which UV had been removed. These observations forecast a host of ensuing physiological and ecological responses of juvenile Atlantic Salmon to increasing temperatures and UVB levels in native streams and rivers where they mature before smolting and returning to the sea. 相似文献
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Abstract Diffuse reflectance Fourier transform infrared (DRIFT) and near infrared (NIR) FT-Raman spectroscopy were used to detect pinosylvins in the wood of Pinus sylvestris L. trees. NIR FT-Raman spectroscopy offered the possibility of revealing pinosylvins simply by visual inspection of Raman spectra whereas DRIFT spectra needed a more complicated evaluation. Pinosylvin and resin acids from Scots pine were examined as to the possibility of their being the cause of observed spectral differences between sapwood and heartwood. Since pinosylvins are important compounds for the decay resistance of Scots pine wood, the detection of pinosylvins with Raman spectroscopy might be used to assess durability of wood products. 相似文献
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Ulrika?Lindmark Birgitta?Stegmayr Berit?Nilsson Bernt?Lindahl Ingegerd?JohanssonEmail author 《Nutrition journal》2005,4(1):9
Background
Favorable dietary habits promote health, whereas unfavorable habits link to various chronic diseases. An individual's "sense of coherence" (SOC) is reported to correlate with prevalence of some diseases to which dietary habits are linked. However, understanding what determines an individual's dietary preferences and how to change his/her behavior remains limited. The aim of the present study was to evaluate associations between dietary intake and SOC in adults. 相似文献10.
Berit Johannes 《Journal of Scheduling》2006,9(5):433-452
We consider the NP-hard problem of scheduling parallel jobs with release dates on identical parallel machines to minimize
the makespan. A parallel job requires simultaneously a prespecified, job-dependent number of machines when being processed.
We prove that the makespan of any nonpreemptive list-schedule is within a factor of 2 of the optimal preemptive makespan.
This gives the best-known approximation algorithms for both the preemptive and the nonpreemptive variant of the problem. We
also show that no list-scheduling algorithm can achieve a better performance guarantee than 2 for the nonpreemptive problem,
no matter which priority list is chosen.
List-scheduling also works in the online setting where jobs arrive over time and the length of a job becomes known only when
it completes; it therefore yields a deterministic online algorithm with competitive ratio 2 as well. In addition, we consider
a different online model in which jobs arrive one by one and need to be scheduled before the next job becomes known. We show
that no list-scheduling algorithm has a constant competitive ratio. Still, we present the first online algorithm for scheduling
parallel jobs with a constant competitive ratio in this context. We also prove a new information-theoretic lower bound of
2.25 for the competitive ratio of any deterministic online algorithm for this model. Moreover, we show that 6/5 is a lower
bound for the competitive ratio of any deterministic online algorithm of the preemptive version of the model jobs arriving
over time. 相似文献