Background Compared with traditional biomagnetic field detection devices,such as superconducting quantum interference devices(SQUIDs)and atomic magnetometers,only giant magneto impedance(GMI)sensors can be applied for...Background Compared with traditional biomagnetic field detection devices,such as superconducting quantum interference devices(SQUIDs)and atomic magnetometers,only giant magneto impedance(GMI)sensors can be applied for unshielded human brain biomagnetic detection,and they have the potential for application in next-generation wearable equipment for brain-computer interfaces(BCIs).Achieving a better GMI sensor without magnetic shielding requires the stimulation of the GMI effect to be maximized and environmental noise interference to be minimized.Moreover,the GMI effect stimulated in an amorphous filament is closely related to its working point,which is sensitive to both the external magnetic field and the drive current of the filament.Methods In this paper,we propose a new noise reducing GMI gradiometer with a dual-loop self-adapting structure.Noise reduction is realized by a direction-flexible differential probe,and the dual-loop structure optimizes and stabilizes the working point by automatically controlling the external magnetic field and drive current.This dual-loop structure is fully program controlled by a micro control unit(MCU),which not only simplifies the traditional constant parameter sensor circuit,saving the time required to adjust the circuit component parameters,but also improves the sensor performance and environmental adaptation.Results In the performance test,within 2 min of self-adaptation,our sensor showed a better sensitivity and signal-to-noise ratio(SNR)than those of the traditional designs and achieved a background noise of 12 pT/√Hz at 10 Hz and 7pT/√Hz at 200 Hz.Conclusion To the best of our knowledge,our sensor is the first to realize self-adaptation of both the external magnetic field and the drive current.展开更多
Animal husbandry is an important way to increase farmers' income, and it also has a vital impact on the overall development level of agricultural economy. In recent years, under the background of rapid social and ...Animal husbandry is an important way to increase farmers' income, and it also has a vital impact on the overall development level of agricultural economy. In recent years, under the background of rapid social and economic development, animal husbandry has made great progress in continuous upgrading and adjustment. In recent years, under the background of rapid socio-economic development, animal husbandry has made great progress with continuous upgrading and adjustment, and the scale of animal husbandry is expanding day by day, which more effectively ensures the output and quality of animal husbandry products. However, in the development of animal husbandry, animal epidemic prevention work of animal husbandry and veterinary medicine can not be separated from strong support, and animal epidemic prevention work plays an irreplaceable role in the development of animal husbandry. However, at present, there are still some problems and deficiencies in animal epidemic prevention work at grass-roots level, which affect the effective promotion of animal husbandry work. Based on this, this paper discusses the animal epidemic prevention work of grass-roots animal husbandry and veterinary.展开更多
At present, the overall economic benefits of construction projects in China are closely related to the quality of budget and settlement audit. The project cost runs through the whole process of the construction projec...At present, the overall economic benefits of construction projects in China are closely related to the quality of budget and settlement audit. The project cost runs through the whole process of the construction project. It is of positive significance to reduce the cost of the project cost and improve the economic benefits of the project by means of efficient project settlement audit. Construction projects have high requirements on construction quality. Ensuring the project construction within a given time and successfully completing the project completion can ensure the overall economic benefits of construction projects. Using scientific and reasonable cost control can improve the efficiency of budget and settlement audit of construction projects and maximize the economic benefits of construction projects.展开更多
基金Supported by the China Postdoctoral Science Foundation(4139ZRL)the National Natural Science Foundation of China(U19A2083).
文摘Background Compared with traditional biomagnetic field detection devices,such as superconducting quantum interference devices(SQUIDs)and atomic magnetometers,only giant magneto impedance(GMI)sensors can be applied for unshielded human brain biomagnetic detection,and they have the potential for application in next-generation wearable equipment for brain-computer interfaces(BCIs).Achieving a better GMI sensor without magnetic shielding requires the stimulation of the GMI effect to be maximized and environmental noise interference to be minimized.Moreover,the GMI effect stimulated in an amorphous filament is closely related to its working point,which is sensitive to both the external magnetic field and the drive current of the filament.Methods In this paper,we propose a new noise reducing GMI gradiometer with a dual-loop self-adapting structure.Noise reduction is realized by a direction-flexible differential probe,and the dual-loop structure optimizes and stabilizes the working point by automatically controlling the external magnetic field and drive current.This dual-loop structure is fully program controlled by a micro control unit(MCU),which not only simplifies the traditional constant parameter sensor circuit,saving the time required to adjust the circuit component parameters,but also improves the sensor performance and environmental adaptation.Results In the performance test,within 2 min of self-adaptation,our sensor showed a better sensitivity and signal-to-noise ratio(SNR)than those of the traditional designs and achieved a background noise of 12 pT/√Hz at 10 Hz and 7pT/√Hz at 200 Hz.Conclusion To the best of our knowledge,our sensor is the first to realize self-adaptation of both the external magnetic field and the drive current.
文摘Animal husbandry is an important way to increase farmers' income, and it also has a vital impact on the overall development level of agricultural economy. In recent years, under the background of rapid social and economic development, animal husbandry has made great progress in continuous upgrading and adjustment. In recent years, under the background of rapid socio-economic development, animal husbandry has made great progress with continuous upgrading and adjustment, and the scale of animal husbandry is expanding day by day, which more effectively ensures the output and quality of animal husbandry products. However, in the development of animal husbandry, animal epidemic prevention work of animal husbandry and veterinary medicine can not be separated from strong support, and animal epidemic prevention work plays an irreplaceable role in the development of animal husbandry. However, at present, there are still some problems and deficiencies in animal epidemic prevention work at grass-roots level, which affect the effective promotion of animal husbandry work. Based on this, this paper discusses the animal epidemic prevention work of grass-roots animal husbandry and veterinary.
文摘At present, the overall economic benefits of construction projects in China are closely related to the quality of budget and settlement audit. The project cost runs through the whole process of the construction project. It is of positive significance to reduce the cost of the project cost and improve the economic benefits of the project by means of efficient project settlement audit. Construction projects have high requirements on construction quality. Ensuring the project construction within a given time and successfully completing the project completion can ensure the overall economic benefits of construction projects. Using scientific and reasonable cost control can improve the efficiency of budget and settlement audit of construction projects and maximize the economic benefits of construction projects.
