As the scale of the power system continues to expand,the environment for power operations becomes more and more complex.Existing risk management and control methods for power operations can only set the same risk dete...As the scale of the power system continues to expand,the environment for power operations becomes more and more complex.Existing risk management and control methods for power operations can only set the same risk detection standard and conduct the risk detection for any scenario indiscriminately.Therefore,more reliable and accurate security control methods are urgently needed.In order to improve the accuracy and reliability of the operation risk management and control method,this paper proposes a method for identifying the key links in the whole process of electric power operation based on the spatiotemporal hybrid convolutional neural network.To provide early warning and control of targeted risks,first,the video stream is framed adaptively according to the pixel changes in the video stream.Then,the optimized MobileNet is used to extract the feature map of the video stream,which contains both time-series and static spatial scene information.The feature maps are combined and non-linearly mapped to realize the identification of dynamic operating scenes.Finally,training samples and test samples are produced by using the whole process image of a power company in Xinjiang as a case study,and the proposed algorithm is compared with the unimproved MobileNet.The experimental results demonstrated that the method proposed in this paper can accurately identify the type and start and end time of each operation link in the whole process of electric power operation,and has good real-time performance.The average accuracy of the algorithm can reach 87.8%,and the frame rate is 61 frames/s,which is of great significance for improving the reliability and accuracy of security control methods.展开更多
In this paper we investigate spatiotemporal pattern formation in excitable media with only a long-range link. Besides the trivial solutions of spiral patterns, we find the asymptotic self-sustained target waves in the...In this paper we investigate spatiotemporal pattern formation in excitable media with only a long-range link. Besides the trivial solutions of spiral patterns, we find the asymptotic self-sustained target waves in the autonomous tissues. The wave source supporting this kind of new pattern is the oscillatory one-dimensional Winfree-loop self- organized under the presence of a long-range link, which is explored by the dominant phase-advanced driving method. Based on this understanding we can effectively regulate the oscillations of excitable media by suitably arranging the long-range link, including construction of self-sustained target waves with controllable period and wave length, or manipulation of system states between different patterns.展开更多
General survey ofhypertension has beencarried out in our coun—try for three times.Thelast time was in 1999,with the result showingthat in our country theincidence of hyperten-sion among people over15 years old was11...General survey ofhypertension has beencarried out in our coun—try for three times.Thelast time was in 1999,with the result showingthat in our country theincidence of hyperten-sion among people over15 years old was11.26％.The incidencehas been raised by 25％展开更多
在TDOA(time difference of arrival)目标模拟系统中,采用微波光子链路传输包含精确TDOA信息的多路多频段目标模拟信号,为保证TDOA信息的精度足够高,需要精确测量目标模拟信号经过光子链路的传输延时。从特定工程应用角度提出一种光子...在TDOA(time difference of arrival)目标模拟系统中,采用微波光子链路传输包含精确TDOA信息的多路多频段目标模拟信号,为保证TDOA信息的精度足够高,需要精确测量目标模拟信号经过光子链路的传输延时。从特定工程应用角度提出一种光子链路传输延时测量方法,通过专用延时测量芯片实现传输延时高分辨率、高精度测量,通过延时测量信号和目标模拟信号分时占用单根光纤的相同光传输波道,实现光子链路传输延时测量和目标模拟信号传输分时工作,从机理上满足了精确测量光子链路传输延时所需硬件条件。试验结果:表明该方法可精确测量目标模拟信号经过光子链路的传输延时,测量误差小于1 ns,比传感器的TDOA测量精度高一个数量级,满足系统对光子链路传输延时的测量精度要求。展开更多
目的:探究问题导引-目标链接式护理干预对糖尿病患者低血糖发生率的影响。方法:选择2022年2月—2023年1月泰州市第三人民医院收治的86例糖尿病患者为研究对象,采用计算机法以01~086对患者进行编号,设置01~043患者为对照组(n=43),实施常...目的:探究问题导引-目标链接式护理干预对糖尿病患者低血糖发生率的影响。方法:选择2022年2月—2023年1月泰州市第三人民医院收治的86例糖尿病患者为研究对象,采用计算机法以01~086对患者进行编号,设置01~043患者为对照组(n=43),实施常规护理,设置044~086患者为观察组(n=43),实施问题导引-目标链接式护理干预。比较两组血糖水平、糖尿病自我管理行为及低血糖发生率。结果:护理前,两组血糖水平比较,差异无统计学意义(P>0.05);护理后,两组空腹血糖(FBG)、餐后2 h血糖(2 h PBG)及糖化血红蛋白(HbA1c)水平均下降,观察组低于对照组,差异有统计学意义(P<0.05)。护理前,两组糖尿病患者自我管理行为量表(SDSCA)评分比较,差异无统计学意义(P>0.05);护理14 d后,两组SDSCA评分升高,观察组高于对照组,差异有统计学意义(P<0.05);观察组低血糖发生率低于对照组,差异有统计学意义(P<0.05)。结论:在糖尿病患者的护理中采用问题导引-目标链接式护理干预,能有效控制血糖水平,提升患者自护能力,降低低血糖发生率。展开更多
In order to develop green good, reduce the use of chemical fertilizer and pesticide, realize ＂double reduction＂ and synergism, improve safety and quality of products, protect the ecological environment and promote t...In order to develop green good, reduce the use of chemical fertilizer and pesticide, realize ＂double reduction＂ and synergism, improve safety and quality of products, protect the ecological environment and promote the healthy and steady development of strawberry industry, the goals and key technology of fertilizer-pesticide ＂double reduction＂ and synergism for greenhouse strawberry are summed up in this paper targeting at the current situation of strawberry production and combined with the new technology achievements at home and abroad. The key technology includes six items： healthy seedling cultivating technique, soil improvement and continuous cropping obstacle treatment technique, agricultural ecological prevention tech- nique, physicochemical trap of pest control technique, biological control technique and low residual risk chemical control technique.展开更多
UAV data link has been considered as an important part of UAV communication system, through which the UAV could communicate with warships. However, constant coding and modulation scheme that UAV adopts does not make f...UAV data link has been considered as an important part of UAV communication system, through which the UAV could communicate with warships. However, constant coding and modulation scheme that UAV adopts does not make full use of the channel capacity when UAV communicates with warships in a good channel environment. In order to improve channel capacity and spectral efficiency, adaptive coded modulation technology is studied. Based on maritime channel model, SNR estimation technology and adaptive threshold determination technology, the simulation of UAV data link communication is carried out in this paper. Theoretic analysis and simulation results show that according to changes in maritime channel state, UAV can dynamically adjust the adaptive coded modulation scheme on the condition of meeting target Bit-Error-Rate (BER), the maximum amount of data transfer is non-adaptive systems three times.展开更多
基金This paper is supported by the Science and technology projects of Yunnan Province(Grant No.202202AD080004).
文摘As the scale of the power system continues to expand,the environment for power operations becomes more and more complex.Existing risk management and control methods for power operations can only set the same risk detection standard and conduct the risk detection for any scenario indiscriminately.Therefore,more reliable and accurate security control methods are urgently needed.In order to improve the accuracy and reliability of the operation risk management and control method,this paper proposes a method for identifying the key links in the whole process of electric power operation based on the spatiotemporal hybrid convolutional neural network.To provide early warning and control of targeted risks,first,the video stream is framed adaptively according to the pixel changes in the video stream.Then,the optimized MobileNet is used to extract the feature map of the video stream,which contains both time-series and static spatial scene information.The feature maps are combined and non-linearly mapped to realize the identification of dynamic operating scenes.Finally,training samples and test samples are produced by using the whole process image of a power company in Xinjiang as a case study,and the proposed algorithm is compared with the unimproved MobileNet.The experimental results demonstrated that the method proposed in this paper can accurately identify the type and start and end time of each operation link in the whole process of electric power operation,and has good real-time performance.The average accuracy of the algorithm can reach 87.8%,and the frame rate is 61 frames/s,which is of great significance for improving the reliability and accuracy of security control methods.
基金supported by the National Natural Science Foundation of China (Grant No. 11047146)the Science Foundation of the Education Bureau of Shaanxi Province of China (Grant No. 11JK0544)+1 种基金the Natural Science Foundation of Shaanxi Province of China (Grant No. 2010JQ1014)the Science Foundation of Baoji University of Arts and Sciences (Grant Nos. ZK1048 andZK1049)
文摘In this paper we investigate spatiotemporal pattern formation in excitable media with only a long-range link. Besides the trivial solutions of spiral patterns, we find the asymptotic self-sustained target waves in the autonomous tissues. The wave source supporting this kind of new pattern is the oscillatory one-dimensional Winfree-loop self- organized under the presence of a long-range link, which is explored by the dominant phase-advanced driving method. Based on this understanding we can effectively regulate the oscillations of excitable media by suitably arranging the long-range link, including construction of self-sustained target waves with controllable period and wave length, or manipulation of system states between different patterns.
文摘General survey ofhypertension has beencarried out in our coun—try for three times.Thelast time was in 1999,with the result showingthat in our country theincidence of hyperten-sion among people over15 years old was11.26％.The incidencehas been raised by 25％
文摘在TDOA(time difference of arrival)目标模拟系统中,采用微波光子链路传输包含精确TDOA信息的多路多频段目标模拟信号,为保证TDOA信息的精度足够高,需要精确测量目标模拟信号经过光子链路的传输延时。从特定工程应用角度提出一种光子链路传输延时测量方法,通过专用延时测量芯片实现传输延时高分辨率、高精度测量,通过延时测量信号和目标模拟信号分时占用单根光纤的相同光传输波道,实现光子链路传输延时测量和目标模拟信号传输分时工作,从机理上满足了精确测量光子链路传输延时所需硬件条件。试验结果:表明该方法可精确测量目标模拟信号经过光子链路的传输延时,测量误差小于1 ns,比传感器的TDOA测量精度高一个数量级,满足系统对光子链路传输延时的测量精度要求。
文摘目的:探究问题导引-目标链接式护理干预对糖尿病患者低血糖发生率的影响。方法:选择2022年2月—2023年1月泰州市第三人民医院收治的86例糖尿病患者为研究对象,采用计算机法以01~086对患者进行编号,设置01~043患者为对照组(n=43),实施常规护理,设置044~086患者为观察组(n=43),实施问题导引-目标链接式护理干预。比较两组血糖水平、糖尿病自我管理行为及低血糖发生率。结果:护理前,两组血糖水平比较,差异无统计学意义(P>0.05);护理后,两组空腹血糖(FBG)、餐后2 h血糖(2 h PBG)及糖化血红蛋白(HbA1c)水平均下降,观察组低于对照组,差异有统计学意义(P<0.05)。护理前,两组糖尿病患者自我管理行为量表(SDSCA)评分比较,差异无统计学意义(P>0.05);护理14 d后,两组SDSCA评分升高,观察组高于对照组,差异有统计学意义(P<0.05);观察组低血糖发生率低于对照组,差异有统计学意义(P<0.05)。结论:在糖尿病患者的护理中采用问题导引-目标链接式护理干预,能有效控制血糖水平,提升患者自护能力,降低低血糖发生率。
基金Supported by Demonstration and Promotion Project of Shanghai Municipal Committee of Agriculture[HNKT(2015)2-7]Jiangsu Agricultural"Three New Engineering"Project[SXGC(2017)208]Jiangsu Agricultural Science and Technology Innovation Fund[CX(15)1029]~~
文摘In order to develop green good, reduce the use of chemical fertilizer and pesticide, realize ＂double reduction＂ and synergism, improve safety and quality of products, protect the ecological environment and promote the healthy and steady development of strawberry industry, the goals and key technology of fertilizer-pesticide ＂double reduction＂ and synergism for greenhouse strawberry are summed up in this paper targeting at the current situation of strawberry production and combined with the new technology achievements at home and abroad. The key technology includes six items： healthy seedling cultivating technique, soil improvement and continuous cropping obstacle treatment technique, agricultural ecological prevention tech- nique, physicochemical trap of pest control technique, biological control technique and low residual risk chemical control technique.
文摘UAV data link has been considered as an important part of UAV communication system, through which the UAV could communicate with warships. However, constant coding and modulation scheme that UAV adopts does not make full use of the channel capacity when UAV communicates with warships in a good channel environment. In order to improve channel capacity and spectral efficiency, adaptive coded modulation technology is studied. Based on maritime channel model, SNR estimation technology and adaptive threshold determination technology, the simulation of UAV data link communication is carried out in this paper. Theoretic analysis and simulation results show that according to changes in maritime channel state, UAV can dynamically adjust the adaptive coded modulation scheme on the condition of meeting target Bit-Error-Rate (BER), the maximum amount of data transfer is non-adaptive systems three times.
