13 research outputs found
Bifurcations of a Homoclinic Orbit to Saddle-Center in Reversible Systems
The bifurcations near a primary homoclinic orbit to a saddle-center are investigated in a 4-dimensional reversible system. By establishing a new kind of local moving frame along the primary homoclinic orbit and using the Melnikov functions, the existence and nonexistence of 1-homoclinic orbit and 1-periodic orbit, including symmetric 1-homoclinic orbit and 1-periodic orbit, and their corresponding codimension 1 or codimension 3 surfaces, are obtained
Bifurcations of a Homoclinic Orbit to Saddle-Center in Reversible Systems
The bifurcations near a primary homoclinic orbit to a saddle-center are investigated in a 4-dimensional reversible system. By establishing a new kind of local moving frame along the primary homoclinic orbit and using the Melnikov functions, the existence and nonexistence of 1-homoclinic orbit and 1-periodic orbit, including symmetric 1-homoclinic orbit and 1-periodic orbit, and their corresponding codimension 1 or
codimension 3 surfaces, are obtained
Electrospun Nanofibers for Integrated Sensing, Storage, and Computing Applications
Electrospun nanofibers have become the most promising building blocks for future high-performance electronic devices because of the advantages of larger specific surface area, higher porosity, more flexibility, and stronger mechanical strength over conventional film-based materials. Moreover, along with the properties of ease of fabrication and cost-effectiveness, a broad range of applications based on nanomaterials by electrospinning have sprung up. In this review, we aim to summarize basic principles, influence factors, and advanced methods of electrospinning to produce hundreds of nanofibers with different structures and arrangements. In addition, electrospun nanofiber based electronics composed of both two-terminal and three-terminal devices and their practical applications are discussed in the fields of sensing, storage, and computing, which give rise to the further integration to realize a comprehensive and brain-like system. Last but not least, the emulation of biological synapses through artificial synaptic transistors and additionally optoelectronics in recent years are included as an important step toward the construction of large-scale, multifunctional systems
Electrospun Nanofibers for Integrated Sensing, Storage, and Computing Applications
Electrospun nanofibers have become the most promising building blocks for future high-performance electronic devices because of the advantages of larger specific surface area, higher porosity, more flexibility, and stronger mechanical strength over conventional film-based materials. Moreover, along with the properties of ease of fabrication and cost-effectiveness, a broad range of applications based on nanomaterials by electrospinning have sprung up. In this review, we aim to summarize basic principles, influence factors, and advanced methods of electrospinning to produce hundreds of nanofibers with different structures and arrangements. In addition, electrospun nanofiber based electronics composed of both two-terminal and three-terminal devices and their practical applications are discussed in the fields of sensing, storage, and computing, which give rise to the further integration to realize a comprehensive and brain-like system. Last but not least, the emulation of biological synapses through artificial synaptic transistors and additionally optoelectronics in recent years are included as an important step toward the construction of large-scale, multifunctional systems
A Miniaturized Integrated SAW Sensing System for Relative Humidity Based on Graphene Oxide Film
Intelligent, Flexible Artificial Throats with Sound Emitting, Detecting, and Recognizing Abilities
In recent years, there has been a notable rise in the number of patients afflicted with laryngeal diseases, including cancer, trauma, and other ailments leading to voice loss. Currently, the market is witnessing a pressing demand for medical and healthcare products designed to assist individuals with voice defects, prompting the invention of the artificial throat (AT). This user-friendly device eliminates the need for complex procedures like phonation reconstruction surgery. Therefore, in this review, we will initially give a careful introduction to the intelligent AT, which can act not only as a sound sensor but also as a thin-film sound emitter. Then, the sensing principle to detect sound will be discussed carefully, including capacitive, piezoelectric, electromagnetic, and piezoresistive components employed in the realm of sound sensing. Following this, the development of thermoacoustic theory and different materials made of sound emitters will also be analyzed. After that, various algorithms utilized by the intelligent AT for speech pattern recognition will be reviewed, including some classical algorithms and neural network algorithms. Finally, the outlook, challenge, and conclusion of the intelligent AT will be stated. The intelligent AT presents clear advantages for patients with voice impairments, demonstrating significant social values
Triode-Mimicking Graphene Pressure Sensor with Positive Resistance Variation for Physiology and Motion Monitoring
Multilayer Graphene Epidermal Electronic Skin
Due
to its excellent flexibility, graphene has an important application
prospect in epidermal electronic sensors. However, there are drawbacks
in current devices, such as sensitivity, range, lamination, and artistry.
In this work, we have demonstrated a multilayer graphene epidermal
electronic skin based on laser scribing graphene, whose patterns are
programmable. A process has been developed to remove the unreduced
graphene oxide. This method makes the epidermal electronic skin not
only transferable to butterflies, human bodies, and any other objects
inseparably and elegantly, merely with the assistance of water, but
also have better sensitivity and stability. Therefore, pattern electronic
skin could attach to every object like artwork. When packed in
Ecoflex, electronic skin exhibits excellent performance, including
ultrahigh sensitivity (gauge factor up to 673), large strain range
(as high as 10%), and long-term stability. Therefore, many subtle
physiological signals can be detected based on epidermal electronic
skin with a single graphene line. Electronic skin with multiple
graphene lines is employed to detect large-range human motion. To
provide a deeper understanding of the resistance variation mechanism,
a physical model is established to explain the relationship between
the crack directions and electrical characteristics. These results
show that graphene epidermal electronic skin has huge potential in
health care and intelligent systems
Multilayer Graphene Epidermal Electronic Skin
Due
to its excellent flexibility, graphene has an important application
prospect in epidermal electronic sensors. However, there are drawbacks
in current devices, such as sensitivity, range, lamination, and artistry.
In this work, we have demonstrated a multilayer graphene epidermal
electronic skin based on laser scribing graphene, whose patterns are
programmable. A process has been developed to remove the unreduced
graphene oxide. This method makes the epidermal electronic skin not
only transferable to butterflies, human bodies, and any other objects
inseparably and elegantly, merely with the assistance of water, but
also have better sensitivity and stability. Therefore, pattern electronic
skin could attach to every object like artwork. When packed in
Ecoflex, electronic skin exhibits excellent performance, including
ultrahigh sensitivity (gauge factor up to 673), large strain range
(as high as 10%), and long-term stability. Therefore, many subtle
physiological signals can be detected based on epidermal electronic
skin with a single graphene line. Electronic skin with multiple
graphene lines is employed to detect large-range human motion. To
provide a deeper understanding of the resistance variation mechanism,
a physical model is established to explain the relationship between
the crack directions and electrical characteristics. These results
show that graphene epidermal electronic skin has huge potential in
health care and intelligent systems
Multilayer Graphene Epidermal Electronic Skin
Due
to its excellent flexibility, graphene has an important application
prospect in epidermal electronic sensors. However, there are drawbacks
in current devices, such as sensitivity, range, lamination, and artistry.
In this work, we have demonstrated a multilayer graphene epidermal
electronic skin based on laser scribing graphene, whose patterns are
programmable. A process has been developed to remove the unreduced
graphene oxide. This method makes the epidermal electronic skin not
only transferable to butterflies, human bodies, and any other objects
inseparably and elegantly, merely with the assistance of water, but
also have better sensitivity and stability. Therefore, pattern electronic
skin could attach to every object like artwork. When packed in
Ecoflex, electronic skin exhibits excellent performance, including
ultrahigh sensitivity (gauge factor up to 673), large strain range
(as high as 10%), and long-term stability. Therefore, many subtle
physiological signals can be detected based on epidermal electronic
skin with a single graphene line. Electronic skin with multiple
graphene lines is employed to detect large-range human motion. To
provide a deeper understanding of the resistance variation mechanism,
a physical model is established to explain the relationship between
the crack directions and electrical characteristics. These results
show that graphene epidermal electronic skin has huge potential in
health care and intelligent systems