With the rapid development of the electric power industry, the traditional "two meters" electric power testing mode has been unable to meet its development needs, and the combination of GPRS technology and e...With the rapid development of the electric power industry, the traditional "two meters" electric power testing mode has been unable to meet its development needs, and the combination of GPRS technology and electric power testing work has brought convenience to the power supply work. This document introduces the advantages and structure of the real-time intelligent power patrol system based on GPRS technology, hoping to provide a reference for the future work. In recent years, with the development of science and technology, peoples demand for electricity is constantly increasing, and the intelligent safety of power lines is the basic premise of power demand. However, in the process of operation, various factors will lead to the power line failure and damage, the need for the power line maintenance personnel to ensure the normal operation of the power at the same time, the maintenance and inspection of the power line. Therefore, the operation of high-altitude transmission line is one of the important tasks of electric power maintenance personnel today. This white paper focuses on the intelligent safety protection of UHV power lines operating at high altitude. This paper will discuss the intelligent safety belt of power line aerial operation based on GPRS communication technology.展开更多
Potassium-based dual ion batteries(KDIBs)have attracted significant attention owing to high working voltage,high safety,low processing cost,and environmental friendliness.Nevertheless,one great challenge for practical...Potassium-based dual ion batteries(KDIBs)have attracted significant attention owing to high working voltage,high safety,low processing cost,and environmental friendliness.Nevertheless,one great challenge for practical KDIBs is to develop suitable anode materials with high specific capacity.Herein,we report an architecture of hierarchically porous antimony nanoparticles/carbon nanofibers(HPSb CNFs)as flexible,free-standing anode for high-performance KDIBs.The HPSb CNFs with hierarchically porous structure,and high-content nitrogen doping,not only offer sufficient free space to tolerate the repetitive volume expansion of Sb nanoparticles during long-term cycling,but also greatly facilitate the transport of electrons and ions within electrode,ensuring high material utilization ratio.Thus,the KDIBs,constituted by HPSb CNFs-700(calcined at 700°C)anode and graphite cathode,exhibited a high reversible capacity of 440 m Ah g^(-1)with high discharge medium voltage of 4.5 V at a specific current of 200 m A g^(-1)(the highest capacity for all KDIBs normalized by the mass of the anode),and excellent cyclic life.Outstanding electrochemical reversibility of the KDIBs was further demonstrated by ex situ XRD,ex situ Raman spectrum,and HRTEM.These results suggest the as-designed HPSb CNFs-700 with highcapacity and long-term cycling stability is a promising anode material for high-performance KDIBs.展开更多
The work functions of the （110） and （10（3） surfaces of LaB6 are determined from ambient pressure to 39.1 GPa. The work function of the （110） surface slowly decreases but that of the （100） surface remains at a...The work functions of the （110） and （10（3） surfaces of LaB6 are determined from ambient pressure to 39.1 GPa. The work function of the （110） surface slowly decreases but that of the （100） surface remains at a relatively constant value. To determine the reason for this difference, the electron density distribution （EDD） is determined from high-pressure single-crystal x-ray diffraction data by the maximum entropy method. The EDD results show that the chemical bond properties in LaB6 play a key role also investigated by single-crystal x-ray diffraction. In observed from ambient pressure to 39.1 GPa. The structural stability of LaB6 under high pressure is this study, no structural or electronic phase transition is展开更多
Background: There is emerging evidence that the increased susceptibility to developing alcohol and substance use dis- orders in those with a family history of Alcohol Dependence (AD) may be related to structural diffe...Background: There is emerging evidence that the increased susceptibility to developing alcohol and substance use dis- orders in those with a family history of Alcohol Dependence (AD) may be related to structural differences in brain circuits that influence the salience of rewards or modify the efficiency of information processing. Externalizing disorders of childhood including Attention Deficit Hyperactivity Disorder, Conduct and Oppositional Disorders are a prominent feature of those with a positive family history. The caudate nuclei have been implicated in both the salience of rewards and in the pathophysiology of alcohol dependence and these often antecedent childhood disorders. Methods: Adolescent/young adult high and low-risk for AD offspring (N = 130) were studied using magnetic resonance imaging. Volumes of the caudate nucleus were obtained using manual tracing with BRAINS2 software and neuropsychological functioning determined. Childhood disorders were assessed as part of a long-term longitudinal follow-up that includes young adult assessment. Dopaminergic variation was assessed using genotypic variation in the catechol-O-methyltransferase (COMT) and DRD2 genes. Results: High-risk subjects showed poorer Working Memory functioning. Caudate volume did not differ between high and low-risk subjects, but those with externalizing disorders of childhood showed reduced caudate volume. Variation in COMT and DRD2 genes was associated with Working Memory performance and caudate volume. Conclusions: Caudate volume is reduced in association with externalizing disorders of childhood/adolescence. Working Memory deficits appear in familial high-risk offspring and those with externalizing disorders of childhood. The dopaminergic system appears to be involved in both working memory performance and externalizing disorders of childhood.展开更多
To determine the rational layout parameters of the lateral high drainage roadway(LHDR) serving for two adjacent working faces, a mechanical model of the LHDR under mining influence was established, and the overburden ...To determine the rational layout parameters of the lateral high drainage roadway(LHDR) serving for two adjacent working faces, a mechanical model of the LHDR under mining influence was established, and the overburden fissure, mining-induced stress distribution rules were analyzed. First, the development characteristics of mining-induced overburden fissure and the stress distribution law of the upper section of the working face were analyzed. Second, by analyzing the distribution law of vertical stress at different layers, the lateral distance of the LHDR was determined as 25 m. Third, by analyzing the surrounding rock deformation effect, stress distribution law, and overburden fissure distribution law of the LHDR at the heights of 20, 25, and 30 m away from the roof, the rational horizon of the LHDR was determined to be 25 m. Finally, an example of a LHDR located 25 m above the roof of the No. 2 coal seam and 25 m away from the No. 2-603 working face was presented. Results show that when the No. 2-603 coalface is being mined, the surrounding rocks lag 80 m or even further and the working face tends to be stable. The relative deformations of the roof and floor of the roadway and both of its walls were 583 and 450 mm,respectively. The reduction rate of the roadway section was 21.52%–25.32%. The section of the roadway was sufficient to extract the pressure relief gas in the overburden of the No. 2-605 working face. The average gas concentration and the pure volume at the branch pipeline were 24.8% and 22.3 m^3/min,respectively, showing that the position of high-level boreholes was reasonable.展开更多
Compared with the conventionally gaseous or liquid working media,the specific internal energy of supercritical carbon dioxide(SCD)is higher at the same temperature and pressure,and the critical temperature of carbon d...Compared with the conventionally gaseous or liquid working media,the specific internal energy of supercritical carbon dioxide(SCD)is higher at the same temperature and pressure,and the critical temperature of carbon dioxide is close to room temperature,making SCD a potential new working medium for pneumatic launch.To analyze the feasibility of this conception,an analytical model of a pneumatic catapult is established on basis of the conservations of mass and energy.The model consists of a high-pressure chamber and a low-pressure chamber connected by multiple valves,and there is a movable piston in the low-pressure chamber that can push an aircraft to accelerate.The effects of the launch readiness state of SCD in the high-pressure chamber,the initial volume of the low-pressure chamber and the valve control on the movement of the aircraft are analyzed.It is found that there is a restrictive relation between the temperature and pressure of the launch readiness state of SCD,i.e.,there is a maximum allowable launch readiness pressure when the launch readiness temperature is fixed.If this restrictive relation is not satisfied,the working medium in the low-pressure chamber will drop to its triple point within a few milliseconds,leading to a launch failure.Owing to this restrictive relation,there is an optimal launch readiness state of SCD with the highest working capacity for any allowable launch readiness temperature.The pressure of the low-pressure chamber will decrease significantly as the initial volume increases,leading to a decreased acceleration of the aircraft.The acceleration can be controlled below a critical value by a designed sequential blasting technique of multiple valves.The calculated results show that a 500 kg aircraft can be accelerated from 0 to 58 m/s in 0.9 s with 36 kg of carbon dioxide.This research provides a new technique for the controllable cold launch of an aircraft.展开更多
2025年度,共有下列63名专家为《上海口腔医学》认真审稿,特提名致谢!(按姓名汉语拼音顺序排列)Many thanks for our peer reviewers,listed below,for their time and hard work spent on review of manuscripts submitted to Shanghai ...2025年度,共有下列63名专家为《上海口腔医学》认真审稿,特提名致谢!(按姓名汉语拼音顺序排列)Many thanks for our peer reviewers,listed below,for their time and hard work spent on review of manuscripts submitted to Shanghai Journal of Stomatology in 2025 and their excellent support of the editorial process.Sincerely congratulating our authors who have published their high quality work in Shanghai Journal of Stomatology cited by IM and MEDLINE.The future of our journal is bright and it will continue to serve as a top-notch interdisciplinary resources for clinicians involved in the care of patients with various dental disorders,and for scientists striving to elucidate the mechanisms and therapy for these diseases.展开更多
针对高转速、高温升、大载荷等持续复杂的工况波动引起的航空发动机高速轴承故障诊断问题,提出了一种新型的深度图迁移学习算法,以及波动工况下基于图迁移卷积网络(graph transfer convolutional networks,简称GTCNs)的航空发动机高速...针对高转速、高温升、大载荷等持续复杂的工况波动引起的航空发动机高速轴承故障诊断问题,提出了一种新型的深度图迁移学习算法,以及波动工况下基于图迁移卷积网络(graph transfer convolutional networks,简称GTCNs)的航空发动机高速轴承故障智能诊断方法。首先,利用阶比分析对波动工况下航空发动机高速轴承振动信号进行重采样,将其转化为阶次谱信号作为目标域与源域数据集;其次,采用训练好的一维图卷积网络(onedimensional graph convolutional networks,简称1dGCNs)作为特征提取器,对其高层敏感特征计算其动态多核-最大均值散度(dynamic multiple kernel-maximum mean discrepancy,简称DMKMMD)距离,同时匹配高层与低层特征的边缘分布差异;然后,将对齐后的特征输入到分类器softmax中进行智能故障诊断;最后,在航空发动机高速轴承故障数据上验证了所提方法的有效性与先进性。结果表明,该方法具有更高的诊断准确率与鲁棒性,可以消除大波动工况下健康状态样本分布的差异性,提高诊断可迁移性。展开更多
文摘With the rapid development of the electric power industry, the traditional "two meters" electric power testing mode has been unable to meet its development needs, and the combination of GPRS technology and electric power testing work has brought convenience to the power supply work. This document introduces the advantages and structure of the real-time intelligent power patrol system based on GPRS technology, hoping to provide a reference for the future work. In recent years, with the development of science and technology, peoples demand for electricity is constantly increasing, and the intelligent safety of power lines is the basic premise of power demand. However, in the process of operation, various factors will lead to the power line failure and damage, the need for the power line maintenance personnel to ensure the normal operation of the power at the same time, the maintenance and inspection of the power line. Therefore, the operation of high-altitude transmission line is one of the important tasks of electric power maintenance personnel today. This white paper focuses on the intelligent safety protection of UHV power lines operating at high altitude. This paper will discuss the intelligent safety belt of power line aerial operation based on GPRS communication technology.
基金financially supported by the National Natural Science Foundation of China(Grant No.21673070)the Fundamental Research Funds of the Central Universities(No.531107051048)Hunan Key Laboratory of Two-Dimensional Materials(No.801200005)
文摘Potassium-based dual ion batteries(KDIBs)have attracted significant attention owing to high working voltage,high safety,low processing cost,and environmental friendliness.Nevertheless,one great challenge for practical KDIBs is to develop suitable anode materials with high specific capacity.Herein,we report an architecture of hierarchically porous antimony nanoparticles/carbon nanofibers(HPSb CNFs)as flexible,free-standing anode for high-performance KDIBs.The HPSb CNFs with hierarchically porous structure,and high-content nitrogen doping,not only offer sufficient free space to tolerate the repetitive volume expansion of Sb nanoparticles during long-term cycling,but also greatly facilitate the transport of electrons and ions within electrode,ensuring high material utilization ratio.Thus,the KDIBs,constituted by HPSb CNFs-700(calcined at 700°C)anode and graphite cathode,exhibited a high reversible capacity of 440 m Ah g^(-1)with high discharge medium voltage of 4.5 V at a specific current of 200 m A g^(-1)(the highest capacity for all KDIBs normalized by the mass of the anode),and excellent cyclic life.Outstanding electrochemical reversibility of the KDIBs was further demonstrated by ex situ XRD,ex situ Raman spectrum,and HRTEM.These results suggest the as-designed HPSb CNFs-700 with highcapacity and long-term cycling stability is a promising anode material for high-performance KDIBs.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11274030 and 11474281
文摘The work functions of the （110） and （10（3） surfaces of LaB6 are determined from ambient pressure to 39.1 GPa. The work function of the （110） surface slowly decreases but that of the （100） surface remains at a relatively constant value. To determine the reason for this difference, the electron density distribution （EDD） is determined from high-pressure single-crystal x-ray diffraction data by the maximum entropy method. The EDD results show that the chemical bond properties in LaB6 play a key role also investigated by single-crystal x-ray diffraction. In observed from ambient pressure to 39.1 GPa. The structural stability of LaB6 under high pressure is this study, no structural or electronic phase transition is
文摘Background: There is emerging evidence that the increased susceptibility to developing alcohol and substance use dis- orders in those with a family history of Alcohol Dependence (AD) may be related to structural differences in brain circuits that influence the salience of rewards or modify the efficiency of information processing. Externalizing disorders of childhood including Attention Deficit Hyperactivity Disorder, Conduct and Oppositional Disorders are a prominent feature of those with a positive family history. The caudate nuclei have been implicated in both the salience of rewards and in the pathophysiology of alcohol dependence and these often antecedent childhood disorders. Methods: Adolescent/young adult high and low-risk for AD offspring (N = 130) were studied using magnetic resonance imaging. Volumes of the caudate nucleus were obtained using manual tracing with BRAINS2 software and neuropsychological functioning determined. Childhood disorders were assessed as part of a long-term longitudinal follow-up that includes young adult assessment. Dopaminergic variation was assessed using genotypic variation in the catechol-O-methyltransferase (COMT) and DRD2 genes. Results: High-risk subjects showed poorer Working Memory functioning. Caudate volume did not differ between high and low-risk subjects, but those with externalizing disorders of childhood showed reduced caudate volume. Variation in COMT and DRD2 genes was associated with Working Memory performance and caudate volume. Conclusions: Caudate volume is reduced in association with externalizing disorders of childhood/adolescence. Working Memory deficits appear in familial high-risk offspring and those with externalizing disorders of childhood. The dopaminergic system appears to be involved in both working memory performance and externalizing disorders of childhood.
基金National Key Basic Research Program of China (973 Program) (No. 2015CB251600)the National Natural Science Foundation of China (Nos. 51327007, 51174157, and 51104118) for their support of this project
文摘To determine the rational layout parameters of the lateral high drainage roadway(LHDR) serving for two adjacent working faces, a mechanical model of the LHDR under mining influence was established, and the overburden fissure, mining-induced stress distribution rules were analyzed. First, the development characteristics of mining-induced overburden fissure and the stress distribution law of the upper section of the working face were analyzed. Second, by analyzing the distribution law of vertical stress at different layers, the lateral distance of the LHDR was determined as 25 m. Third, by analyzing the surrounding rock deformation effect, stress distribution law, and overburden fissure distribution law of the LHDR at the heights of 20, 25, and 30 m away from the roof, the rational horizon of the LHDR was determined to be 25 m. Finally, an example of a LHDR located 25 m above the roof of the No. 2 coal seam and 25 m away from the No. 2-603 working face was presented. Results show that when the No. 2-603 coalface is being mined, the surrounding rocks lag 80 m or even further and the working face tends to be stable. The relative deformations of the roof and floor of the roadway and both of its walls were 583 and 450 mm,respectively. The reduction rate of the roadway section was 21.52%–25.32%. The section of the roadway was sufficient to extract the pressure relief gas in the overburden of the No. 2-605 working face. The average gas concentration and the pure volume at the branch pipeline were 24.8% and 22.3 m^3/min,respectively, showing that the position of high-level boreholes was reasonable.
基金This work was funded by the National Natural Science Foundation of China(No.51576188).
文摘Compared with the conventionally gaseous or liquid working media,the specific internal energy of supercritical carbon dioxide(SCD)is higher at the same temperature and pressure,and the critical temperature of carbon dioxide is close to room temperature,making SCD a potential new working medium for pneumatic launch.To analyze the feasibility of this conception,an analytical model of a pneumatic catapult is established on basis of the conservations of mass and energy.The model consists of a high-pressure chamber and a low-pressure chamber connected by multiple valves,and there is a movable piston in the low-pressure chamber that can push an aircraft to accelerate.The effects of the launch readiness state of SCD in the high-pressure chamber,the initial volume of the low-pressure chamber and the valve control on the movement of the aircraft are analyzed.It is found that there is a restrictive relation between the temperature and pressure of the launch readiness state of SCD,i.e.,there is a maximum allowable launch readiness pressure when the launch readiness temperature is fixed.If this restrictive relation is not satisfied,the working medium in the low-pressure chamber will drop to its triple point within a few milliseconds,leading to a launch failure.Owing to this restrictive relation,there is an optimal launch readiness state of SCD with the highest working capacity for any allowable launch readiness temperature.The pressure of the low-pressure chamber will decrease significantly as the initial volume increases,leading to a decreased acceleration of the aircraft.The acceleration can be controlled below a critical value by a designed sequential blasting technique of multiple valves.The calculated results show that a 500 kg aircraft can be accelerated from 0 to 58 m/s in 0.9 s with 36 kg of carbon dioxide.This research provides a new technique for the controllable cold launch of an aircraft.
文摘2025年度,共有下列63名专家为《上海口腔医学》认真审稿,特提名致谢!(按姓名汉语拼音顺序排列)Many thanks for our peer reviewers,listed below,for their time and hard work spent on review of manuscripts submitted to Shanghai Journal of Stomatology in 2025 and their excellent support of the editorial process.Sincerely congratulating our authors who have published their high quality work in Shanghai Journal of Stomatology cited by IM and MEDLINE.The future of our journal is bright and it will continue to serve as a top-notch interdisciplinary resources for clinicians involved in the care of patients with various dental disorders,and for scientists striving to elucidate the mechanisms and therapy for these diseases.
