97,564 research outputs found
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
Interview with Theodore Y. Wu
Full text linkAn interview in three sessions, February-March 2002, with Theodore Y. Wu, professor of engineering science, emeritus, in the Division of Engineering and Applied Science. Dr. Wu was born in China and received his BSc from Chiao-Tung University (1946), his MS from Iowa State University (1948), and his PhD from Caltech (1952).
In this interview, he recalls his boyhood and tribulations during Japan's invasion of China in World War II, his emigration and matriculation at Iowa State in 1948, and his arrival at Caltech a year later. Recollections of H. S. Tsien, R. A. Millikan, Theodore von Kármán, Julian Cole. Works with Paco Lagerstrom's aeronautics group developing asymptotic perturbation method pioneered by Ludwig Prandtl. Joins faculty as a research fellow in 1952. Interest in hydrodynamics. Origins of the department of engineering science in the mid-1950s by Tsien, Milton Plesset, and Charles De Prima.
Interest in bioengineering, beginning in 1960; studies bird flight and fish locomotion. Discusses influence of G. I. Taylor and James Lighthill, and recalls his own work on flagellar and ciliary motion of microorganisms. Caltech's 1974 pioneering symposium on Swimming and Flying in Nature; new field of biofluiddynamics. Recollections of Y. C. (Burt) Fung.
Recalls his sabbatical, 1964-65, at University of Hamburg with Georg Weinblum. Joins Advisory Committee for Reactor Safeguards. Recollections of Caltech presidents Lee DuBridge and Marvin L. Goldberger. Visit to China in 1979.
Discusses his work, since 1996 retirement, on modeling of water waves; solitons and tsunamis. Concludes with comments on good relations between Chinese and Chinese American scientists and the flood of Chinese students to US for graduate work in late 1970s, after reestablishment of diplomatic relations
Performance enhancement of spherical natural graphite by phenol resin in lithium ion batteries
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Wu David Y. H., Traditional Chinese Concepts of Food and Medicine in Singapore
No full textTopley Marjorie. Wu David Y. H., Traditional Chinese Concepts of Food and Medicine in Singapore. In: Archipel, volume 22, 1981. pp. 243-244
Reticularisus Wu, Wu & Han, a new subgenus of the genus Rhamnosa Fixsen, 1887 from China, with description of a new species (Lepidoptera: Limacodidae)
No full textA new subgenus, ReticularisusWu, Wu & Han, subgen. n., with type species Rhamnosa henanensis Wu, 2008,of the genus Rhamnosa Fixsen, 1887 is described and illustrated. For the sake of contrast, the type species of theother two subgenera in this genus have been given, including adults and male genitalia. Rhamnosa (Reticularisus) shierbeihoua Wu, Wu & Han, sp. n., a Limacodidae collected from the southwest of China is described as new to science. Also, the new species is illustrated with images of the adult and male genitalia and compared with the similar species Rh. henanensis.Se describe e ilustra un nuevo subgénero, Reticularisus Wu, Wu & Han, subgen. n., con la especie tipo Rhamnosa henanensis Wu, 2008, del género Rhamnosa Fixsen, 1887. Para contrastar, se da la especie tipo de los otros dos subgéneros en este género, incluyendo los adultos y la genitalia del macho. Se describe como nueva para la ciencia a Rhamnosa (Reticularisus) shierbeihoua Wu, Wu & Han, sp. n., un Limacodidae capturado del suroeste de China. También la nueva especie es ilustrada con imágenes del adulto y genitalia del macho y comparada con la especie similar Rh. henanensis
Prediction Model of PTSD Symptoms One Year post the Taiwan 921 Earthquake—A Case of Adolescents Living close to the Epicenter
No full textFacile synthesis of 7-dimethylamino-endo-tricyclo[5.2.2.0(1,6)]undec-10-en-9-ones
No full textPentacarbonyl[(2E)-3-cyclohexenyl-3-dimethylamino-1-ethoxy-2-propen-1-ylidene]chromium (2) yields 7-dimethylamino-endo-tricyclo[5.2.2.0(1,6)]undec-10-en-9-ones 5 (15-88%, 12 examples) upon treatment with alkynes 3 in pyridine, most probably by a 6 pi -electrocyclization followed by a subsequent reductive elimination/intermolecular Diels-Alder reaction with the alkyne and eventual hydrolysis. The direct cyclization of 2 to the cyclohexane-annelated cyclopentadiene 6 is faster than the usual alkyne insertion of alpha,beta -unsaturated Fischer carbene complexes. The [4+2] cycloadditions of 7 and the added alkynes 3 occur with high degrees of regio- and complete diastereoselectivity
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