The motor as a driving equipment is currently widely used, in order to ensure the safe operation of the motor, according to the motor rated voltage, rated current, rated power and other parameters, will be equipped wi...The motor as a driving equipment is currently widely used, in order to ensure the safe operation of the motor, according to the motor rated voltage, rated current, rated power and other parameters, will be equipped with different protection devices, and the low-voltage motor comprehensive protection device in chemical plants, power plants and other factories and mines have been widely applied. The safety and stable operation of the motor is directly related to the safe and stable operation of the factory and mine, so the correct input and reliable action of the motor protection is particularly important. Shake power is a commonly known as voltage fluctuation, voltage drop and short interruption. Especially in the thunder rainy season, because the lightning strike will cause different degrees of power grid fluctuations, voltage amplitude mutation, waveform distortion, directly affect the quality of power supply, many times will cause motor trip. Based on the field simulation test, this article analyzes the action of the motor control circuit of the low voltage motor protector in the process of shaking, analyzes the causes of the electric trip, and puts forward certain solutions to reduce the trip rate of the equipment, which is of great significance to ensure the safe and stable operation of the plant and mine.展开更多
The single and coupled photonic crystal nanocavity lasers are fabricated in the InGaAsP material system and their static and dynamic features are compared. The coupled-cavity lasers show a larger lasing e^ciency and g...The single and coupled photonic crystal nanocavity lasers are fabricated in the InGaAsP material system and their static and dynamic features are compared. The coupled-cavity lasers show a larger lasing e^ciency and generate an output power higher than the single-cavity lasers, results that are consistent with the theoretical results obtained by rate equations. In dynamic regime, the single-cavity lasers produce pulses as short as 113 ps, while the coupled-cavity lasers show a significantly longer lasing duration. These results indicate that the photonic crystal laser is a promising candidate for the light source in high-speed photonic integrated circuit.展开更多
Objective: to study the effect of applying the anesthesia and nursing integration model in the anesthesia recovery room of hypertension surgery. Methods: 70 patients with hypertension admitted to the anesthesia recove...Objective: to study the effect of applying the anesthesia and nursing integration model in the anesthesia recovery room of hypertension surgery. Methods: 70 patients with hypertension admitted to the anesthesia recovery room of our hospital from January 2020 to December 2021 were selected and randomly divided into two groups, of which 35 patients in the control group received routine nursing management;The observation group of 35 cases used the anesthesia nursing integrated management model, and compared the adverse reactions, anesthesia recovery time and Steward score of the two groups. Results: the incidence of adverse reactions of heart rate abnormality, agitation and hypoxemia in the observation group was lower than that in the control group, and the difference between the groups was statistically significant (P < 0.05). The anesthesia recovery time in the observation group (96.42±5.28) min was shorter than that in the control group (90.33±4.69) min, and the Steward score in the observation group (4.75±0.38) was higher than that in the control group (3.48±0.27), with statistical significance (p < 0.05). Conclusion: in the nursing of anesthesia recovery room for hypertension patients undergoing surgery, the effect of adopting the anesthesia care integrated management model is good, which can reduce the incidence of adverse reactions, shorten the anesthesia recovery time, and improve the Steward score, and have a positive impact on the maintenance of patients' health.展开更多
The unmanned aerial vehicles( UAV) has been becoming more and more important in the aviation industry.Despite the superior performance and advanced technology,major accident of UAV happens frequently due to the impact...The unmanned aerial vehicles( UAV) has been becoming more and more important in the aviation industry.Despite the superior performance and advanced technology,major accident of UAV happens frequently due to the impact of their systems,long distance of remote control and skill of manipulator technology.According to the application of engineering application,failure mode effects and criticality analysis( FMECA),failure reporting analysis and corrective action comprehensive analysis systems( FRACAS)and fault tree analysis( FTA)( 3 F) were combined.And also a set of user-friendly,more time,more efficient and accurate reliability analysis system were explored.展开更多
In this study, the winter-summer-winter seasonal variation characteristics of the atmospheric temperature in northern East Asia(NEA) during the past 60 years are analyzed. The results revealed a type of new seasonal v...In this study, the winter-summer-winter seasonal variation characteristics of the atmospheric temperature in northern East Asia(NEA) during the past 60 years are analyzed. The results revealed a type of new seasonal variation mechanism of temperature: winter-winter recurrence(WWR). This study initially discussed the formation mechanism of WWR from the angle of the relationship between the WWR and the atmospheric internal factors and external forcing.The main conclusions are summarized as follows:(1) The winter-summer-winter continuous variation of the AO anomaly index has consistent characteristics with the atmospheric variation of the WWR in the NEA, and their 60-year correlation coefficient reaches 0.43, passing the 95% significance level. It is indicated that the seasonal anomaly of the AO has a certain influence on the WWR;(2) Overall, the PDO maintains a negative phase in the negative WWR years,while it displays the opposite feature in the positive WWR years. The negative(positive) anomaly of PDO is favourable to the occurrence of sustainable low(high) temperatures in the NEA, and may be the important external driving factor for motivating the WWR in the NEA;(3) The binary regression, based on the PDO and AO indexes successfully reproduces the curve of T_(WWR-HG), which is significantly correlated with the WWR index TWWR, and can reproduce the time-height profile of the WWR characteristics from 400 to 1,000 hPa. Therefore, it is concluded that the WWR of the atmospheric temperatures in the NEA is the result of the combined action of the PDO and AO.展开更多
文摘The motor as a driving equipment is currently widely used, in order to ensure the safe operation of the motor, according to the motor rated voltage, rated current, rated power and other parameters, will be equipped with different protection devices, and the low-voltage motor comprehensive protection device in chemical plants, power plants and other factories and mines have been widely applied. The safety and stable operation of the motor is directly related to the safe and stable operation of the factory and mine, so the correct input and reliable action of the motor protection is particularly important. Shake power is a commonly known as voltage fluctuation, voltage drop and short interruption. Especially in the thunder rainy season, because the lightning strike will cause different degrees of power grid fluctuations, voltage amplitude mutation, waveform distortion, directly affect the quality of power supply, many times will cause motor trip. Based on the field simulation test, this article analyzes the action of the motor control circuit of the low voltage motor protector in the process of shaking, analyzes the causes of the electric trip, and puts forward certain solutions to reduce the trip rate of the equipment, which is of great significance to ensure the safe and stable operation of the plant and mine.
基金Supported by the National Key Basic Research Special Fund/CNKBRSF of China under Grant Nos 2012CB933501,2016YFA0301102,2016YFB0401804 and 2016YFB0402203the National Natural Science Foundation of China under Grant Nos61535013,61321063 and 61137003+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant Nos XDB24010100,XDB24010200,XDB24020100 and XDB24030100the One Hundred Person Project of the Chinese Academy of Sciences
文摘The single and coupled photonic crystal nanocavity lasers are fabricated in the InGaAsP material system and their static and dynamic features are compared. The coupled-cavity lasers show a larger lasing e^ciency and generate an output power higher than the single-cavity lasers, results that are consistent with the theoretical results obtained by rate equations. In dynamic regime, the single-cavity lasers produce pulses as short as 113 ps, while the coupled-cavity lasers show a significantly longer lasing duration. These results indicate that the photonic crystal laser is a promising candidate for the light source in high-speed photonic integrated circuit.
文摘Objective: to study the effect of applying the anesthesia and nursing integration model in the anesthesia recovery room of hypertension surgery. Methods: 70 patients with hypertension admitted to the anesthesia recovery room of our hospital from January 2020 to December 2021 were selected and randomly divided into two groups, of which 35 patients in the control group received routine nursing management;The observation group of 35 cases used the anesthesia nursing integrated management model, and compared the adverse reactions, anesthesia recovery time and Steward score of the two groups. Results: the incidence of adverse reactions of heart rate abnormality, agitation and hypoxemia in the observation group was lower than that in the control group, and the difference between the groups was statistically significant (P < 0.05). The anesthesia recovery time in the observation group (96.42±5.28) min was shorter than that in the control group (90.33±4.69) min, and the Steward score in the observation group (4.75±0.38) was higher than that in the control group (3.48±0.27), with statistical significance (p < 0.05). Conclusion: in the nursing of anesthesia recovery room for hypertension patients undergoing surgery, the effect of adopting the anesthesia care integrated management model is good, which can reduce the incidence of adverse reactions, shorten the anesthesia recovery time, and improve the Steward score, and have a positive impact on the maintenance of patients' health.
基金Naional Natural Science Foundntion of China(No.71761030)
文摘The unmanned aerial vehicles( UAV) has been becoming more and more important in the aviation industry.Despite the superior performance and advanced technology,major accident of UAV happens frequently due to the impact of their systems,long distance of remote control and skill of manipulator technology.According to the application of engineering application,failure mode effects and criticality analysis( FMECA),failure reporting analysis and corrective action comprehensive analysis systems( FRACAS)and fault tree analysis( FTA)( 3 F) were combined.And also a set of user-friendly,more time,more efficient and accurate reliability analysis system were explored.
基金State Key development program for Basic Research(2017YFC15023003)National Natural Science Foundation of China(41575082,41530531)Special Scientific Research Project for Public Interest(GYHY201306021)
文摘In this study, the winter-summer-winter seasonal variation characteristics of the atmospheric temperature in northern East Asia(NEA) during the past 60 years are analyzed. The results revealed a type of new seasonal variation mechanism of temperature: winter-winter recurrence(WWR). This study initially discussed the formation mechanism of WWR from the angle of the relationship between the WWR and the atmospheric internal factors and external forcing.The main conclusions are summarized as follows:(1) The winter-summer-winter continuous variation of the AO anomaly index has consistent characteristics with the atmospheric variation of the WWR in the NEA, and their 60-year correlation coefficient reaches 0.43, passing the 95% significance level. It is indicated that the seasonal anomaly of the AO has a certain influence on the WWR;(2) Overall, the PDO maintains a negative phase in the negative WWR years,while it displays the opposite feature in the positive WWR years. The negative(positive) anomaly of PDO is favourable to the occurrence of sustainable low(high) temperatures in the NEA, and may be the important external driving factor for motivating the WWR in the NEA;(3) The binary regression, based on the PDO and AO indexes successfully reproduces the curve of T_(WWR-HG), which is significantly correlated with the WWR index TWWR, and can reproduce the time-height profile of the WWR characteristics from 400 to 1,000 hPa. Therefore, it is concluded that the WWR of the atmospheric temperatures in the NEA is the result of the combined action of the PDO and AO.
