Landmarks     

Z. M. 《Prospects》1991,21(2):139-141

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Landmarks     

Z. M. 《Prospects》1988,18(2):151-153

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Investigation on CO(2) laser irradiation inducing glass strip peeling for microchannel formation     

Wang ZK  Zheng HY 《Biomicrofluidics》2012,6(1):12820-1282012

The study investigates the use of CO₂ laser to induce glass strip peeling off to form microchannels on soda lime gass substrate. The strip peeling exhibits a strong dependence on the energy deposition rate on the glass surface. In spite of the vast difference in the combination of laser power and scanning speed, when the ratio of the two makes the energy deposition rate in the range 3.0-6.0 J/(cm² s), the temperature rising inside glass will be above the strain point and reach the softening region of the glass. As a result, glass strip peeling is able to occur and form microchannels with dimensions of 20-40 μm in depth and 200-280 μm in width on the glass surface. Beyond this range, higher energy depsotion rate would lead to surface melting associated with solidification cracks and lower energy deposition rate causes the generation of fragment cracks.  相似文献   

The cipher of the zodiac     

Robert Fox  Charles C. Gillispie  Theresa Levitt  David Aubin  Jed Z. Buchwald  Diane Greco Josefowicz 《Metascience》2012,21(3):509-530

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Inactivation of infectious bursal disease virus by binary ethylenimine and formalin   总被引：1，自引：0，他引：1  

Habib M  Hussain I  Fang WH  Rajput ZI  Yang ZZ  Irshad H 《Journal of Zhejiang University. Science. B》2006,7(4):320-323

In this experiment conducted to study the inactivation dynamics of infectious bursal disease virus （IBDV） by binary ethylenimine （BEI） in comparison with formalin, IBDV was isolated from the bursa of infected chickens and its confirmation was done by agar gel precipitation test. Viral suspensions were subjected to inactivation with BEI and formalin for pre-set time in- tervals. BEI was employed at concentrations of 0.001 and 0.002 mol/L while formalin was used at 0.1% and 0.2%. Sampling was done at 6, 12, 24, 36 and 48 h of incubation and samples were tested for their inactivation status in 9-day-old embryonated eggs and 3-week-old broiler chickens. IBDV was completely inactivated by 0.001 and 0.002 mol/L BEI after 36 h of incubation at 37℃, whereas formalin at 0. 1% and 0.2% concentrations inactivated IBDV in 24 h.  相似文献   

Functional Illiteracy In Chicago     

John Z. Bowers  Lee Cogan 《Equity & Excellence in Education》2013,46(1):28-29

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Robots Teaching Other Little Robots: Neoliberalism,CCSS, and Teacher Professionalism     

Jason L. Endacott  Ginney P. Wright  Christian Z. Goering  Vicki S. Collet  George S. Denny  Jennifer Jennings Davis 《Review of Education, Pedagogy & Cultural Studies》2013,35(5):414-437

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Tact and Tactics in Schooling     

Edgar Z. Friedenberg 《Review of Education, Pedagogy & Cultural Studies》2013,35(4):361-364

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Special issue on Inerter-based systems: Design,modeling, optimization and control     

Michael Z. Q. Chen  David Wagg  James Lam  Mehdi Ahmadian  Malcolm C. Smith 《Journal of The Franklin Institute》2019,356(14):7609-7610

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Robust self-triggered MPC with fast convergence for constrained linear systems     

L. Dai  F. Yang  Z. Qiang  Y. Xia 《Journal of The Franklin Institute》2019,356(3):1446-1467

In this paper, a robust self-triggered model predictive control (MPC) scheme is proposed for linear discrete-time systems subject to additive disturbances, state and control constraints. To reduce the amount of computation on controller sides, MPC optimization problems are only solved at certain sampling instants which are determined by a novel self-triggering mechanism. The main idea of the self-triggering mechanism is to choose inter-sampling times by guaranteeing a fast decrease in optimal costs. It implies a fast convergence of system states to a compact set where it is ultimately bounded and a reduction of computation times to stabilize the system. Once the state enters a terminal region, the system can be stabilized to a robust invariant set by a state feedback controller. Robust constraint satisfaction is ensured by utilizing the worst-case set-valued predictions of future states in such a way that recursive feasibility is guaranteed for all possible realisations of disturbances. In the case where a priority is given to reducing communication costs rather than improvement in control performance in a neighborhood of the origin, a feedback control law based on nominal state predictions is designed in the terminal region to avoid frequent feedback. Performances of the closed-loop system are demonstrated by a simulation example.  相似文献