The fluorescence behaviours of a chemical-sensitive fluorescent molecule 1,2-di[5-methoxy-2-(2-pyridiyl)thiazoyl]ethyne (DMPTE) at different protonation and coordination states were studied. Upon addition of protons, ...
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The fluorescence behaviours of a chemical-sensitive fluorescent molecule 1,2-di[5-methoxy-2-(2-pyridiyl)thiazoyl]ethyne (DMPTE) at different protonation and coordination states were studied. Upon addition of protons, metal ions and other chemicals, the fluorescent states can be switched reversibly. On the basis of the changes of fluorescence output signals from particular wavelengths in response to different combination sets of two particular external stimuli, the entire set of 2-bit Boolean binary logic functions were realized at the molecular level, including PASS 0, PASS 1, YES, NOT, OR, NOR, INHIBIT, IMPLICATION, AND, NAND, XOR, XNOR, and different logic functions were integrated reconfigurably within DMPTE. Besides, starting from the same initial state, a series of three-input logic gates and circuits were also constructed. Furthermore, the stepwise recognition process of DMPTE to different chemical input signals can also be utilized to distinguish different input sequences, thus a molecular keypad lock that authenticates three-digit password entries is indicated.
Parametron circuits are described that will perform ternary logical functions in digital devices with phase representation of information;modified majority circuit is proposed as basis of these circuits, which provide...
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Parametron circuits are described that will perform ternary logical functions in digital devices with phase representation of information;modified majority circuit is proposed as basis of these circuits, which provide complete system of ternary logical functions;results of experimental investigation.
Spatial locality brings the advantages of computation speed-up and sequence reuse to molecular computing. In particular, molecular walkers that undergo localized reactions are of interest for implementing logic comput...
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Spatial locality brings the advantages of computation speed-up and sequence reuse to molecular computing. In particular, molecular walkers that undergo localized reactions are of interest for implementing logic computations at the nanoscale. We use molecular spider walkers to implement logic circuits. We develop an extended multi-spider model with a dynamic environment wherein signal transmission is triggered via localized reactions, and use this model to implement three basic gates (AND, OR, NOT) and a cascading mechanism. We develop an algorithm to automatically generate the layout of the circuit. We use a kinetic Monte Carlo algorithm to simulate circuit computations, and we analyze circuit complexity: our design scales linearly with formula size and has a logarithmic time complexity. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
Low power yet high speed logic integrated circuits are realized using enhancement type Schottky barrier FETs (ESBT) with 2 mu m gate length and 0. 1 volt threshold voltage. The basic logic circuit is a NOR gate compri...
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Low power yet high speed logic integrated circuits are realized using enhancement type Schottky barrier FETs (ESBT) with 2 mu m gate length and 0. 1 volt threshold voltage. The basic logic circuit is a NOR gate comprised of ESBTs and a resistor utilizing implanted n-layer. A 15-stage ring oscillator is integrated in a monolithic form. Performance of ESBIC logic LSI is estimated and its feasibility is also discussed, including device size.
We demonstrate logic circuits with field-effect transistors based on single carbon nanotubes. A now technique is used for achieving local gates in nanotube field-effect transistors that provide excellent capacitive co...
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We demonstrate logic circuits with field-effect transistors based on single carbon nanotubes. A now technique is used for achieving local gates in nanotube field-effect transistors that provide excellent capacitive coupling between the gate and nanotube, enabling the transistor to be ambipolar. The transistors show favorable device characteristics such as a high gain, a large on-off ratio. and room-temperature operation. Importantly, it also allows for the integration of Multiple devices on a single chip. Indeed, we demonstrate 1, 2-. and 3-transistor circuits that exhibit a wide range of digital logic operations such as an inverter, a logic NOR, and an AC ring oscillator. (C) 2002 Elsevier Science B.V. All rights reserved.
The resonant-tunneling hot-electron transistor (RHET) is a functional device that features a negative differential conductance. Using non-self-aligned InGaAs RHETs, the following basic gates are made: inverter, 3-inpu...
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ISBN:
(纸本)0780318447
The resonant-tunneling hot-electron transistor (RHET) is a functional device that features a negative differential conductance. Using non-self-aligned InGaAs RHETs, the following basic gates are made: inverter, 3-input AND/NOR, 2-input NOR, 2-input AND, 2-input Ex-NOR. To simplify circuit operation, the RHETi-InAlAs/i-InGaAs/ i-InAlAs emitter barrier is designed not to have a negative differential conductance. The collector barrier has bilayer structure (i-InGaAlAs/i-InGaAs) to improve the current gain at low collector-base voltages. The RHETs have a dc current gain of 8 and a collector-base breakdown voltage of 2.5V. circuits are tested at 77K with a supply voltage of 2.5V. The inverter has an inverter voltage Vinv of 1.3V, an output high Voh of 2.3V, an output low Vol of 0.5V, and a voltage gain of 2.5 a Vinv. The 3-input AND/NOR gate gives the predicted output. It has Voh and Vol of 2.5V and 1.0V, implying that it can drive inverters.
We propose a method for computing maximal sets of symmetric inputs in logic circuits, using a test generation procedure for single stuck-at faults. The method is enhanced by a heuristic that can be used to identify no...
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We propose a method for computing maximal sets of symmetric inputs in logic circuits, using a test generation procedure for single stuck-at faults. The method is enhanced by a heuristic that can be used to identify nonsymmetric inputs and thus reduce the number of inputs for which test generation has to be carried out. We show the relevance of the problem to input matching for design diagnosis and for technology mapping. Experimental results demonstrate the effectiveness of the proposed procedures.
The reliability and performance which can be achieved in high-speed switching circuits using presently available high-frequency junction transistors suggests the use of transistor circuits in preference to more conven...
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DNA-based logic circuits, encoding algorithms in DNA and processing information, are pushing the frontiers of molecular computers forward, owing to DNA's advantages of stability, accessibility, manipulability, and...
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DNA-based logic circuits, encoding algorithms in DNA and processing information, are pushing the frontiers of molecular computers forward, owing to DNA's advantages of stability, accessibility, manipulability, and especially inherent biological significance and potential medical application. In recent years, numerous logic functions, from arithmetic to nonarithmetic, have been realized based on DNA. However, DNA can barely provide a detectable signal by itself, so that the DNA-based circuits depend on extrinsic signal actuators. The signal strategy of carrying out a response is becoming one of the design focuses in DNA-based logic circuit construction. Although work on sequence and structure design for DNA-based circuits has been well reviewed, the strategy on signal production lacks comprehensive summary. In this review, we focused on the latest designs of fluorescent output for DNA-based logic circuits. Several basic strategies are summarized and a few designs for developing multi-output systems are provided. Finally, some current difficulties and possible opportunities were also discussed.
The past decade has been a productive period for development in the field of large-scale digital computers. Magnetics has played an increasingly important part in these developments [1]-[8]. Magnetic cores, tapes, and...
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