To suppress the interference in the ultra-wideband （AI-UWB） system is a challenging problem. An anti-interference multiband orthogonal frequency-division multiplexing ultra-wideband （AI-UWB） system, based on sprea...To suppress the interference in the ultra-wideband （AI-UWB） system is a challenging problem. An anti-interference multiband orthogonal frequency-division multiplexing ultra-wideband （AI-UWB） system, based on spreading and interleaving is addressed. It will exploit the frequency diversity across the subcarriers and provide the robustness to narrow-band interference, by spreading the coded bit streams within each sub-band and interleaving across all sub-bands. Simulating results show that the spreading and interleaving provide about 5 dB to 10 dB advantages over the conventional multiband orthogonal frequency-division multiplexing ultra-wideband system in signal-to-interference ratio. Spreading and interleaving is an effective cure for enhancing the robustness to narrowband interference.展开更多
Multiplexing technologies based on superconducting quantum interference devices(SQUIDs) are crucial to cryogenic readout of superconducting transition-edge sensor(TES) arrays. Demands for large-scale TES arrays promot...Multiplexing technologies based on superconducting quantum interference devices(SQUIDs) are crucial to cryogenic readout of superconducting transition-edge sensor(TES) arrays. Demands for large-scale TES arrays promote the development of multiplexing technologies towards large multiplexing factors and low readout noise. The development of multiplexing technologies also facilitates new applications of TES arrays in a wide range of frequencies. Here we summarize different types of SQUID-based multiplexing technologies including time-division multiplexing, code-division multiplexing, frequency-division multiplexing and microwave SQUID multiplexing. The advances and parameter constraints of each multiplexing technology are also discussed.展开更多
Satellite navigation interference technology as a threatening, hidden interference technology, application potential. However, it also faces challenges, that is, interference detection and anti-interference technologi...Satellite navigation interference technology as a threatening, hidden interference technology, application potential. However, it also faces challenges, that is, interference detection and anti-interference technologies emerge in an endless stream. In practical application, problems such as insufficient anti-interference performance, excessive high complexity, and affecting the accuracy of pseudo-distance measurement appear which poses severe challenges to the ranging and positioning function of the navigation receiver. At present, a large number of studies are based on theoretical analysis and laboratory testing, and we still need to carry out a large number of experiments on non-cooperative targets and accumulate a large number of measured data, which is more conducive to develop and enrich the content of interference technology.展开更多
In recent years, microelectronic components are more widely used in relay protection devices, but most of the electronic devices are electronic sensitive devices, which are easy to be affected by interference. When th...In recent years, microelectronic components are more widely used in relay protection devices, but most of the electronic devices are electronic sensitive devices, which are easy to be affected by interference. When the relay protection devices are interfered in the power system, if there is a fault, it will affect the overall security of the power grid, resulting in the power grid cannot operate stably. When the interference energy exceeds the maximum allowable energy of the logic circuit, it will directly damage the components and affect the normal operation of the relay protection device. Therefore, strengthening the anti-interference ability of relay protection and automation devices has become an important topic in power system.展开更多
Over the course of the past 35 years,assisted reproductive technologies(ARTs)have been increasingly used worldwide,while debates on their safety have been generated.Birth defects and imprinting disorders were reported...Over the course of the past 35 years,assisted reproductive technologies(ARTs)have been increasingly used worldwide,while debates on their safety have been generated.Birth defects and imprinting disorders were reported in previous research.Thus,the psychological development of children born following ARTs has become a major concern nowadays.This review gives a systematic view of psychological well-being of children conceived by different types of ART,including in vitro fertilization,intracytoplasmic sperm injection(ICSI),preimplantation genetic diagnosis/screening,and in vitro maturation.The previous studies are analyzed in three sections:(1)cognitive,motor,and language developments,(2)behavior problems and socio-emotional development,and(3)parent-child relationship.We conclude that although the majority of the studies on cognitive,motor,and language developments reported comparable achievements in the ART group vs.the naturally conceived group,lower intelligence quotient(IQ)scores,worse visual-motor ability or locomotor development,and delayed receptive language competence were found in the ART group.The results on the socio-emotional development were reassuring.As for the behavior problems,a higher prevalence of behavior problems existed in ART children;moreover,ICSI children were found to be at a higher risk of autism than the general population.Meanwhile,ART parents tended to have positive parental attitudes and be more protective of their children.Some suggestions for further research are also given in this review.展开更多
基金the National "863" High Technology Research Program of China (2005AA123320)Universities Natural Science Research Project of Jiangsu Province (05KJB510101).
文摘To suppress the interference in the ultra-wideband （AI-UWB） system is a challenging problem. An anti-interference multiband orthogonal frequency-division multiplexing ultra-wideband （AI-UWB） system, based on spreading and interleaving is addressed. It will exploit the frequency diversity across the subcarriers and provide the robustness to narrow-band interference, by spreading the coded bit streams within each sub-band and interleaving across all sub-bands. Simulating results show that the spreading and interleaving provide about 5 dB to 10 dB advantages over the conventional multiband orthogonal frequency-division multiplexing ultra-wideband system in signal-to-interference ratio. Spreading and interleaving is an effective cure for enhancing the robustness to narrowband interference.
基金Project supported by the National Science Foundation of China (Grant Nos. 11653001 and 11653004)。
文摘Multiplexing technologies based on superconducting quantum interference devices(SQUIDs) are crucial to cryogenic readout of superconducting transition-edge sensor(TES) arrays. Demands for large-scale TES arrays promote the development of multiplexing technologies towards large multiplexing factors and low readout noise. The development of multiplexing technologies also facilitates new applications of TES arrays in a wide range of frequencies. Here we summarize different types of SQUID-based multiplexing technologies including time-division multiplexing, code-division multiplexing, frequency-division multiplexing and microwave SQUID multiplexing. The advances and parameter constraints of each multiplexing technology are also discussed.
文摘Satellite navigation interference technology as a threatening, hidden interference technology, application potential. However, it also faces challenges, that is, interference detection and anti-interference technologies emerge in an endless stream. In practical application, problems such as insufficient anti-interference performance, excessive high complexity, and affecting the accuracy of pseudo-distance measurement appear which poses severe challenges to the ranging and positioning function of the navigation receiver. At present, a large number of studies are based on theoretical analysis and laboratory testing, and we still need to carry out a large number of experiments on non-cooperative targets and accumulate a large number of measured data, which is more conducive to develop and enrich the content of interference technology.
文摘In recent years, microelectronic components are more widely used in relay protection devices, but most of the electronic devices are electronic sensitive devices, which are easy to be affected by interference. When the relay protection devices are interfered in the power system, if there is a fault, it will affect the overall security of the power grid, resulting in the power grid cannot operate stably. When the interference energy exceeds the maximum allowable energy of the logic circuit, it will directly damage the components and affect the normal operation of the relay protection device. Therefore, strengthening the anti-interference ability of relay protection and automation devices has become an important topic in power system.
基金Project supported by the National Basic Research Program(973)of China(No.2012CB944901)the National Natural Science Foundation of China(Nos.81070532 and 81070541)the Zhejiang Provincial Natural Science Foundation of China(Nos.Y2100822 andLZ13H040001)
文摘Over the course of the past 35 years,assisted reproductive technologies(ARTs)have been increasingly used worldwide,while debates on their safety have been generated.Birth defects and imprinting disorders were reported in previous research.Thus,the psychological development of children born following ARTs has become a major concern nowadays.This review gives a systematic view of psychological well-being of children conceived by different types of ART,including in vitro fertilization,intracytoplasmic sperm injection(ICSI),preimplantation genetic diagnosis/screening,and in vitro maturation.The previous studies are analyzed in three sections:(1)cognitive,motor,and language developments,(2)behavior problems and socio-emotional development,and(3)parent-child relationship.We conclude that although the majority of the studies on cognitive,motor,and language developments reported comparable achievements in the ART group vs.the naturally conceived group,lower intelligence quotient(IQ)scores,worse visual-motor ability or locomotor development,and delayed receptive language competence were found in the ART group.The results on the socio-emotional development were reassuring.As for the behavior problems,a higher prevalence of behavior problems existed in ART children;moreover,ICSI children were found to be at a higher risk of autism than the general population.Meanwhile,ART parents tended to have positive parental attitudes and be more protective of their children.Some suggestions for further research are also given in this review.
