16,251 research outputs found
A rapid and improved method for generating cDNA libraries in plasmid and phage vectors
No full textCited by:
-Constitutive expression of nitrate reductase allows normal growth and development of Nicotiana plumbaginifolia plants.
M Vincentz and M Caboche
EMBO J. 1991 May; 10(5): 1027–1035.
- Alternative splicing of HLA-DQB transcripts and secretion of HLA-DQ beta-chain proteins: allelic polymorphism in splicing and polyadenylylation sites.
P Briata, S F Radka, S Sartoris, and J S Lee
Proc Natl Acad Sci U S A. 1989 February; 86(3): 1003–1007.
- Defective HLA class II expression in a regulatory mutant is partially complemented by activated ras oncogenes.
C R Hume, R S Accolla, and J S Lee
Proc Natl Acad Sci U S A. 1987 December; 84(23): 8603–8607
Yang-Lee zeros of one-dimensional quantum many-body systems
No full textWe obtain a generic formula for the distribution of Yang-Lee zeros of one-dimensional quantum many-body systems solvable by the Bethe ansatz and the Yang-Yang thermodynamic formalism. We find that the zeros are located on the negative real axis of the complex fugacity plane and thus prove that no phase transition occurs in these one-dimensional systems, as proved by others using different methods. [S1063-651X(99)08101-5].open114sciescopu
Adaptive fuzzy regulation of strip tension and looper angle in hot finishing mill
No full textThis paper presents an adaptive fuzzy controller with feedback linearization and switching control technique that is used to regulate the tension of steel strip and the angle of looper system that exist between stands of the hot finishing mill. Each control loop in the proposed controller adopted an adaptive fuzzy logic structure which is reported to be superior in performance to the neural network techniques. The adaptive fuzzy controller is robust due to its fuzzy representation of the controller and is adaptive due to its training capability. The feedback linearizing control term improves control performance particularly in the transient behavior, whereas the switching control term compensates for the inevitable model approximation error incurred by the fuzzy logic representation. Combining all these terms, the proposed controller is asymptotically stable with robustness in the adaptive fuzzy controller.X112sciescopu
Photocatalytic water splitting under visible light with particulate semiconductor catalysts
No full textPhotocatalytic water splitting (PWS) is the most promising technology to produce H-2 energy directly from renewable water and solar light. PWS has made a remarkable progress last decades under ultra-violet (UV) light, but there are many technical challenges remaining for PWS under visible light. Several approaches are taken in search of photocatalysts efficient for PWS under visible light: (i) to find new single phase materials, (ii) to decorate UV-active photocatalysts with a photosensitizer absorbing visible light, (iii) to tune the band gap energy by modifying cations or anions of UV-active photocatalysts with substitutional doping, and (iv) to fabricate multi-component photocatalysts by forming composites or solid solutions. This article discusses the above approaches based on our experimental results as well as data available in the literature. At the moment, the greatest challenge to the progress of visible light PWS is the low efficiency of light utilization. Finding new photocatalytic materials with unique structure and phase is still the key to the success. In addition, the synthesis of these materials with high crystallinity and high surface area is also important, because these properties exert great impact on the activity of the material of the same structure and phase. Finally, smart combination and modification of known materials could also be fruitful.X11143sciescopu
Input and system identification of the Hualien soil-structure interaction system using earthquake response data
No full textThis paper presents an input and system identification technique for a soil-structure interaction system using earthquake response data. Identification is carried out on the Hualien large-scale seismic test structure, which was built in Taiwan for international joint research. The identified quantities are the input ground acceleration as well as the shear wave velocities of the near-field soil regions and Young's moduli of the shell sections of the structure. The earthquake response analysis on the soil-structure interaction system is carried out using the finite element method incorporating the infinite element formulation for the unbounded layered soil medium and the substructured wave input technique. The criterion function for the parameter estimation is constructed using the frequency response amplitude ratios of the earthquake responses measured at several points of the structure, so that the information on the input motion may be excluded. The constrained steepest descent method is employed to obtain the revised parameters. The simulated earthquake responses using the identified parameters and input ground motion show excellent agreement with the measured responses. Copyright 0 2003 John Wiley Sons, Ltd
Critical nature of ideal Bose-Einstein condensation: Similarity with Yang-Lee theory of phase transition
No full textIt is found that the singularity of the thermodynamic potential of an ideal Bose gas is connected with the physical root z(0) = 1 of the inverse of the,grand partition function. The critical nature is determined solely by the behavior of the root distribution of the inverse of the grand partition function near z(0) = 1. This is quite similar to the situation of phase transition described by Yang-Lee theory. [S1063-651X(99)12801-0].open115sciescopu
Heuristic search for scheduling flexible manufacturing systems using lower bound reachability matrix
No full textFor scheduling flexible manufacturing systems efficiently, we propose new heuristic functions for A* algorithm that is based on the T-timed Petri net. In minimizing makespan, the proposed heuristic functions are usually more efficient than the previous functions in the required number of states and computation time. We prove that these heuristic functions are all admissible and one of them is more informed than that using resource cost reachability matrix. We also propose improved versions of these heuristic functions that find a first near-optimal solution faster. In addition, we modify the heuristic function of Yu, Reyes, Cang, and Lloyd (2003b) and propose an admissible version in all states. The experimental results using a random problem generator show that the proposed heuristic functions perform better as we expected. (C) 2010 Elsevier Ltd. All rights reserved.X112026sciescopu
Nonvolatile memory devices based on self-assembled nanocrystals
No full textNonvolatile memory devices are one of the most important components in modern electronic devices. Many efforts have been made to fabricate high-density, low-cost, nonvolatile solid-state memory devices for use in portable/mobile electronic devices such as laptop computers, tablet devices, smart phones, etc. Among the many available nonvolatile memory devices, flash memory devices are of great interest to the electronics industry owing to their simple device structure, enabling high-density memory applications. Flash memory devices in which nanoparticles or nanocrystals are used as the charge-trapping elements have advantages over conventional flash memory devices because the charge-trapping layer and memory performance of the former can be readily optimized. Active research has recently been conducted to fabricate and characterize self-assembled-nanocrystal-based nonvolatile memory devices. We reviewed various strategies for fabricating nanocrystal-based nonvolatile memory devices and discussed the programmable memory properties and the device reliability characteristics of nanocrystal-based memory devices to possibly apply nanocrystal-based memory devices to those used in portable/mobile electronic devices. Finally, novel device applications such as printed/flexible/transparent electronic devices were explored based on nanocrystal-based memory devices. (C) 2013 Elsevier B.V. All rights reserved.X1155sciescopu
Patterning of amorphous-InGaZnO thin-film transistors by stamping of surface-modified polydimethylsiloxane
No full textAn indium gallium zinc oxide (IGZO) layer was patterned and thin-film transistors (TFTs) were fabricated by surface modified polydimethylsiloxane (PDMS) stamping and IGZO solution. The PDMS stamp was prepared by immersion in piranha solution and treatment with UV-ozone to make a hydrophilic surface. Patterned PDMS was inked by contact with the IGZO layer, and then stamped on the desired substrate. The process did not cause etching damage, so the stamped amorphous-IGZO TFTs showed low leakage current of similar to 10(-11) A, high on/off current ratio of similar to 10(8), carrier mobility of 6 cm(2) V-1 s(-1), and narrow hysteresis of 0.2 V. UV irradiation on the IGZO layer caused a photochemical annealing effect that improved the electrical properties of IGZO TFTs. This method provides a simple and versatile process to fabricate transparent metal-oxide TFTs based on patterning the devices by reusable stamping methods.1110Ysciescopu
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