The Experts below are selected from a list of 229083 Experts worldwide ranked by ideXlab platform
Michael A Ferenczi - One of the best experts on this subject based on the ideXlab platform.
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myosin head movements are synchronous with the elementary force Generating Process in muscle
Nature, 1992Co-Authors: Malcolm Irving, Vincenzo Lombardi, Gabriella Piazzesi, Michael A FerencziAbstract:Myosin head movements are synchronous with the elementary force-Generating Process in muscle
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myosin head movements are synchronous with the elementary force Generating Process in muscle
Nature, 1992Co-Authors: Malcolm Irving, Vincenzo Lombardi, Gabriella Piazzesi, Michael A FerencziAbstract:Motor proteins such as myosin, dynein and kinesin use the free energy of ATP hydrolysis to produce force or motion, but despite recent progress their molecular mechanism is unknown. The best characterized system is the myosin motor which moves actin filaments in muscle. When an active muscle fibre is rapidly shortened the force first decreases, then partially recovers over the next few milliseconds. This elementary force-Generating Process is thought to be due to a structural 'working stroke' in the myosin head domain, although structural studies have not provided definitive support for this. X-ray diffraction has shown that shortening steps produce a large decrease in the intensity of the 14.5 nm reflection arising from the axial repeat of the myosin heads along the filaments. This was interpreted as a structural change at the end of the working stroke, but the techniques then available did not allow temporal resolution of the elementary force-Generating Process itself. Using improved measurement techniques, we show here that myosin heads move by about 10 nm with the same time course as the elementary force-Generating Process.
Zhong Lin Wang - One of the best experts on this subject based on the ideXlab platform.
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piezoelectric and semiconducting coupled power Generating Process of a single zno belt wire a technology for harvesting electricity from the environment
Nano Letters, 2006Co-Authors: Jinhui Song, Jun Zhou, Zhong Lin WangAbstract:This paper presents the experimental observation of piezoelectric generation from a single ZnO wire/belt for illustrating a fundamental Process of converting mechanical energy into electricity at nanoscale. By deflecting a wire/belt using a conductive atomic force microscope tip in contact mode, the energy is first created by the deflection force and stored by piezoelectric potential, and later converts into piezoelectric energy. The mechanism of the generator is a result of coupled semiconducting and piezoelectric properties of ZnO. A piezoelectric effect is required to create electric potential of ionic charges from elastic deformation; semiconducting property is necessary to separate and maintain the charges and then release the potential via the rectifying behavior of the Schottky barrier at the metal−ZnO interface, which serves as a switch in the entire Process. The good conductivity of ZnO is rather unique because it makes the current flow possible. This paper demonstrates a principle for harvesting...
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piezoelectric and semiconducting coupled power Generating Process of a single zno belt wire a technology for harvesting electricity from the environment
Nano Letters, 2006Co-Authors: Jinhui Song, Jun Zhou, Zhong Lin WangAbstract:This paper presents the experimental observation of piezoelectric generation from a single ZnO wire/belt for illustrating a fundamental Process of converting mechanical energy into electricity at nanoscale. By deflecting a wire/belt using a conductive atomic force microscope tip in contact mode, the energy is first created by the deflection force and stored by piezoelectric potential, and later converts into piezoelectric energy. The mechanism of the generator is a result of coupled semiconducting and piezoelectric properties of ZnO. A piezoelectric effect is required to create electric potential of ionic charges from elastic deformation; semiconducting property is necessary to separate and maintain the charges and then release the potential via the rectifying behavior of the Schottky barrier at the metal-ZnO interface, which serves as a switch in the entire Process. The good conductivity of ZnO is rather unique because it makes the current flow possible. This paper demonstrates a principle for harvesting energy from the environment. The technology has the potential of converting mechanical movement energy (such as body movement, muscle stretching, blood pressure), vibration energy (such as acoustic/ultrasonic wave), and hydraulic energy (such as flow of body fluid, blood flow, contraction of blood vessels) into electric energy that may be sufficient for self-powering nanodevices and nanosystems in applications such as in situ, real-time, and implantable biosensing, biomedical monitoring, and biodetection.
Malcolm Irving - One of the best experts on this subject based on the ideXlab platform.
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myosin head movements are synchronous with the elementary force Generating Process in muscle
Nature, 1992Co-Authors: Malcolm Irving, Vincenzo Lombardi, Gabriella Piazzesi, Michael A FerencziAbstract:Myosin head movements are synchronous with the elementary force-Generating Process in muscle
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myosin head movements are synchronous with the elementary force Generating Process in muscle
Nature, 1992Co-Authors: Malcolm Irving, Vincenzo Lombardi, Gabriella Piazzesi, Michael A FerencziAbstract:Motor proteins such as myosin, dynein and kinesin use the free energy of ATP hydrolysis to produce force or motion, but despite recent progress their molecular mechanism is unknown. The best characterized system is the myosin motor which moves actin filaments in muscle. When an active muscle fibre is rapidly shortened the force first decreases, then partially recovers over the next few milliseconds. This elementary force-Generating Process is thought to be due to a structural 'working stroke' in the myosin head domain, although structural studies have not provided definitive support for this. X-ray diffraction has shown that shortening steps produce a large decrease in the intensity of the 14.5 nm reflection arising from the axial repeat of the myosin heads along the filaments. This was interpreted as a structural change at the end of the working stroke, but the techniques then available did not allow temporal resolution of the elementary force-Generating Process itself. Using improved measurement techniques, we show here that myosin heads move by about 10 nm with the same time course as the elementary force-Generating Process.
Jinhui Song - One of the best experts on this subject based on the ideXlab platform.
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piezoelectric and semiconducting coupled power Generating Process of a single zno belt wire a technology for harvesting electricity from the environment
Nano Letters, 2006Co-Authors: Jinhui Song, Jun Zhou, Zhong Lin WangAbstract:This paper presents the experimental observation of piezoelectric generation from a single ZnO wire/belt for illustrating a fundamental Process of converting mechanical energy into electricity at nanoscale. By deflecting a wire/belt using a conductive atomic force microscope tip in contact mode, the energy is first created by the deflection force and stored by piezoelectric potential, and later converts into piezoelectric energy. The mechanism of the generator is a result of coupled semiconducting and piezoelectric properties of ZnO. A piezoelectric effect is required to create electric potential of ionic charges from elastic deformation; semiconducting property is necessary to separate and maintain the charges and then release the potential via the rectifying behavior of the Schottky barrier at the metal−ZnO interface, which serves as a switch in the entire Process. The good conductivity of ZnO is rather unique because it makes the current flow possible. This paper demonstrates a principle for harvesting...
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piezoelectric and semiconducting coupled power Generating Process of a single zno belt wire a technology for harvesting electricity from the environment
Nano Letters, 2006Co-Authors: Jinhui Song, Jun Zhou, Zhong Lin WangAbstract:This paper presents the experimental observation of piezoelectric generation from a single ZnO wire/belt for illustrating a fundamental Process of converting mechanical energy into electricity at nanoscale. By deflecting a wire/belt using a conductive atomic force microscope tip in contact mode, the energy is first created by the deflection force and stored by piezoelectric potential, and later converts into piezoelectric energy. The mechanism of the generator is a result of coupled semiconducting and piezoelectric properties of ZnO. A piezoelectric effect is required to create electric potential of ionic charges from elastic deformation; semiconducting property is necessary to separate and maintain the charges and then release the potential via the rectifying behavior of the Schottky barrier at the metal-ZnO interface, which serves as a switch in the entire Process. The good conductivity of ZnO is rather unique because it makes the current flow possible. This paper demonstrates a principle for harvesting energy from the environment. The technology has the potential of converting mechanical movement energy (such as body movement, muscle stretching, blood pressure), vibration energy (such as acoustic/ultrasonic wave), and hydraulic energy (such as flow of body fluid, blood flow, contraction of blood vessels) into electric energy that may be sufficient for self-powering nanodevices and nanosystems in applications such as in situ, real-time, and implantable biosensing, biomedical monitoring, and biodetection.
James S Speck - One of the best experts on this subject based on the ideXlab platform.
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evidence for trap assisted auger recombination in mbe grown ingan quantum wells by electron emission spectroscopy
arXiv: Mesoscale and Nanoscale Physics, 2020Co-Authors: Daniel J Myers, Andrew C Espenlaub, Kristina Gelzinyte, Erin C Young, Lucio Martinelli, Jacques Peretti, Claude Weisbuch, James S SpeckAbstract:We report on the direct measurement of hot electrons generated in the active region of blue light-emitting diodes grown by ammonia molecular beam epitaxy by electron emission spectroscopy. The external quantum efficiency of these devices is <1% and does not droop; thus, the efficiency losses from the intrinsic, interband, electron-electron-hole, or electron-hole-hole Auger should not be a significant source of hot carriers. The detection of hot electrons in this case suggests that an alternate hot electron Generating Process is occurring within these devices, likely a trap-assisted Auger recombination Process.
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evidence for trap assisted auger recombination in mbe grown ingan quantum wells by electron emission spectroscopy
Applied Physics Letters, 2020Co-Authors: Daniel J Myers, Andrew C Espenlaub, Kristina Gelzinyte, Erin C Young, Lucio Martinelli, Jacques Peretti, Claude Weisbuch, James S SpeckAbstract:We report on the direct measurement of hot electrons generated in the active region of blue light-emitting diodes grown by ammonia molecular beam epitaxy by electron emission spectroscopy. The external quantum efficiency of these devices is <1% and does not droop; thus, the efficiency losses from the intrinsic, interband, electron–electron–hole, or electron–hole–hole Auger should not be a significant source of hot carriers. The detection of hot electrons in this case suggests that an alternate hot electron Generating Process is occurring within these devices, likely a trap-assisted Auger recombination Process.We report on the direct measurement of hot electrons generated in the active region of blue light-emitting diodes grown by ammonia molecular beam epitaxy by electron emission spectroscopy. The external quantum efficiency of these devices is <1% and does not droop; thus, the efficiency losses from the intrinsic, interband, electron–electron–hole, or electron–hole–hole Auger should not be a significant source of hot carriers. The detection of hot electrons in this case suggests that an alternate hot electron Generating Process is occurring within these devices, likely a trap-assisted Auger recombination Process.
