文章旨在探讨窄带物联网(Narrow Band Internet of Things,NB-IoT)中通信数据传输的优化方法。通过分析NB-IoT的特点和数据传输过程中的瓶颈,提出一系列针对性的优化策略,包括数据压缩与封装优化、数据聚合与帧结构设计、时间间隔调整...文章旨在探讨窄带物联网(Narrow Band Internet of Things,NB-IoT)中通信数据传输的优化方法。通过分析NB-IoT的特点和数据传输过程中的瓶颈,提出一系列针对性的优化策略,包括数据压缩与封装优化、数据聚合与帧结构设计、时间间隔调整与功耗控制、自适应重传机制以及网络优化与协议改进等,以提高NB-IoT的数据传输效率并降低能耗,为NB-IoT的进一步发展和应用提供参考。展开更多
The paper describes assessment of the performance of cement-poor concretes on the basis of packing theory. The concretes are intended for sealing segments of deep boreholes and have a small amount of cement for minimi...The paper describes assessment of the performance of cement-poor concretes on the basis of packing theory. The concretes are intended for sealing segments of deep boreholes and have a small amount of cement for minimizing the mutual chemical impact on the contacting clay seals. The composition is examined by application of packing theory with respect to the cement/aggregate ratio and the gradation of the aggregate material which is crushed quartzite for providing high internal friction after maturation, as well as to talc added for fluidity and to the small amount of cement. Low porosity and micro-structural stability must be guaranteed for very long periods of time. The study exemplifies how packing theory assist designers in selecting optimal proportions of the various components. Optimum particle packing implies minimizing the porosity and thereby reducing the amount of cement paste needed to fill the voids between the aggregate particles. The use of talc as inorganic super-plasticizer since ordinary organic additives for reaching high fluidity at casting are undesirable, and since talc reacts with cement and provides high strength in along-term perspective.展开更多
文摘文章旨在探讨窄带物联网(Narrow Band Internet of Things,NB-IoT)中通信数据传输的优化方法。通过分析NB-IoT的特点和数据传输过程中的瓶颈,提出一系列针对性的优化策略,包括数据压缩与封装优化、数据聚合与帧结构设计、时间间隔调整与功耗控制、自适应重传机制以及网络优化与协议改进等,以提高NB-IoT的数据传输效率并降低能耗,为NB-IoT的进一步发展和应用提供参考。
文摘The paper describes assessment of the performance of cement-poor concretes on the basis of packing theory. The concretes are intended for sealing segments of deep boreholes and have a small amount of cement for minimizing the mutual chemical impact on the contacting clay seals. The composition is examined by application of packing theory with respect to the cement/aggregate ratio and the gradation of the aggregate material which is crushed quartzite for providing high internal friction after maturation, as well as to talc added for fluidity and to the small amount of cement. Low porosity and micro-structural stability must be guaranteed for very long periods of time. The study exemplifies how packing theory assist designers in selecting optimal proportions of the various components. Optimum particle packing implies minimizing the porosity and thereby reducing the amount of cement paste needed to fill the voids between the aggregate particles. The use of talc as inorganic super-plasticizer since ordinary organic additives for reaching high fluidity at casting are undesirable, and since talc reacts with cement and provides high strength in along-term perspective.
