小波熵及其在状态趋势分析中的应用

研究了离散小波变换的若干特性．以及用信息熵来反映信号统计分布特征的方法．引进了多尺度．下小波熵和相对小波熵的概念，并且以此为参量对系统状态进行趋势分析．从而突出系统信号中短暂的异常信号．达到及早发现可能故障的目的。最后通过数值实验和应用实例说明：分析这两个参数的变化情况．可以反映系统的状态趋势，提高维修的针对性．降低设备维修的代价，提高设备的安全性和可靠性。     

Significance of Nanomaterials in Wearables: A Review on Wearable Actuators and Sensors

Together with the evolution of digital health care, the wearable electronics field has evolved rapidly during the past few years and is expected to be expanded even further within the first few years of the next decade. As the next stage of wearables is predicted to move toward integrated wearables, nanomaterials and nanocomposites are in the spotlight of the search for novel concepts for integration. In addition, the conversion of current devices and attachment‐based wearables into integrated technology may involve a significant size reduction while retaining their functional capabilities. Nanomaterial‐based wearable sensors have already marked their presence with a significant distinction while nanomaterial‐based wearable actuators are still at their embryonic stage. This review looks into the contribution of nanomaterials and nanocomposites to wearable technology with a focus on wearable sensors and actuators.     

CO2套管式气体冷却器设计及试验研究

设计开发一台名义制热量为4．5kW的CO2套管式气体冷却器,并在CO2换热器性能试验装置上进行试验研究。试验结果表明,利用Petukhov—Popov—Kirilo传热关联式设计计算结果与试验结果一致性较好,偏差小于10％。     

MHTR超临界蒸汽透平循环再热器设计研究

基于采用多堆一机方案可以实现模块式高温气冷堆(MHTR)与大容量超临界蒸汽透平机组的匹配,从而实现MHTR的高效率发电的考虑,进行了MHTR超临界蒸汽透平循环再热器设计的研究.根据百万千瓦级超临界机组的参数确定了主蒸汽和再热蒸汽的MHTR分堆供应方案,给出了再热器的技术参数.通过对不同传热管结构方案的比较,确定了组件式直管型式的结构设计方案,该设计具有结构紧凑、传热系数大、刚度好和制造方便等优点.经过热工水力分析计算,证明这种设计能够满足传热和水动力要求.     

酮肼交联体系在阴极电泳涂料中的应用

使用苯乙烯、丙烯酸酯单体以及功能单体甲基丙烯酸缩水甘油醚(GMA)和交联单体双丙酮丙烯酰胺(DAAM)对中分子量的环氧树脂(E-20)进行接枝改性,并对改性的环氧树脂进行胺化、酸化、自乳化处理,从而制备出含有活性酮羰基的阳离子型乳液;以此乳液为基本成膜物质,选用己二酰肼(ADH)与体系中酮羰基进行交联,并进一步加入少量...     

Principle and realization method of tunnel deformation detection based on image recognition and data transmission technology

To detect the deformation of the tunnel structure based on image sensor networks is the advanced study and application of spatial sensor technology. For the vertical settlement of metro tunnel caused by internal and external stress after its long period operation, the overall scheme and measuring principle of a tunnel deformation detection system is introduced. The image data acquisition and processing of detection target are achieved by the cooperative work of image sensor, ARM embedded system. RS485 communication achieves the data transmission between ARM memory and Host Computer. The database system in station platform analyses the detection data and obtain the deformation state of tunnel inner wall, which makes it possible to early-warn the tunnel deformation and take preventive measures in time.     

全站仪检测数据管理系统

介绍了全站仪检测数据管理系统。本系统以FoxPro for Windows为基础,采用模块结构,具有对检测数据录入修改,自动转换,成果计算,查询显示等功能,实现了系统数据管理和处理的一体化。     

Sphingolipids at Plasmodesmata: Structural Components and Functional Modulators

Plasmodesmata (PD) are plant-specific channels connecting adjacent cells to mediate intercellular communication of molecules essential for plant development and defense. The typical PD are organized by the close apposition of the plasma membrane (PM), the desmotubule derived from the endoplasmic reticulum (ER), and spoke-like elements linking the two membranes. The plasmodesmal PM (PD-PM) is characterized by the formation of unique microdomains enriched with sphingolipids, sterols, and specific proteins, identified by lipidomics and proteomics. These components modulate PD to adapt to the dynamic changes of developmental processes and environmental stimuli. In this review, we focus on highlighting the functions of sphingolipid species in plasmodesmata, including membrane microdomain organization, architecture transformation, callose deposition and permeability control, and signaling regulation. We also briefly discuss the difference between sphingolipids and sterols, and we propose potential unresolved questions that are of help for further understanding the correspondence between plasmodesmal structure and function.     

Influence of residual chirality on the conformation and enzymatic degradation of glycopolypeptide based biomaterials

Science China Technological Sciences - Glycopolypeptides as analogs of glycoproteins or glycosaminoglycans represent attractive building blocks for the construction of biomimetic biomaterials....     

高强聚烯烃静态断裂过程银纹区的性能1.HDPE

为了观察分析高密度聚乙烯(HDPE)的银纹区性能,对两种HDPE全切痕试样分别进行了速率为0.1 mm/min,0.5 mm/min,1 mm/min,5 mm/min,20 mm/min和50 mm/min的拉伸测试。基于对静态断裂过程应力-位移数据的分析处理,结果表明,HDPE的屈服应力随着拉伸速率增大;高应力时两种HDPE均存在常临界位移控制其银纹断裂;HDPE2480银纹微纤的稳定性较大,材料韧性较好。HDPE静态拉伸断面显微结构显示,HDPE2480的银纹微纤尺寸大于HDPE4801,导致两者断面弧形巢尺寸和弧形巢内粗糙度的不同。