Technical Characteristics and Innovations of the Gravity-1 Launch Vehicle

On January 11, 2024, the Gravity-1 launch vehicle successfully carried out its maiden flight from a mobile sea platform off the coast of Haiyang in Shandong Province, sending three meteorological satellites, Yunyao-1 satellite No. 18-20, into an orbit about 500 km above the ground. The successful debut flight of Gravity-1 broke many records such as the world's largest solid launch vehicle, the first sea-launched strap-on launch vehicle in the world, with the maximum carrying capacity of current commercial launch vehicle in China. This flight marked a big step in the field of China's commercial space launch application. A new breakthrough has been made, which is of great significance for further expanding China's diversified and large-scale launch capabilities of medium and low orbit satellites, expanding the spectrum of China's launch vehicle types, and promoting the development of space science.

无线传感技术在煤矿机械自供电监测系统的研究

煤矿机械设备在井下作业时,设备的关键部件易受到矿石、煤渣等杂质的磨损和侵袭,长时间运行可能导致结构的失效和破坏,造成较大的经济损失。为了提高煤矿机械设备的使用性能,对设备可能出现的故障进行预警,结合无线传感技术,设计了一种煤矿机械自供电监测系统,相对于传统监测系统,该设计采用无线传感和能效管理技术,在能效控制方面有很大的优势,由于机械设备的运行温度和振动特性是非常重要的状态指标,因此,在设计煤矿机械自供电监测系统时,重点针对温度传感器和振动传感器电路进行了研究。

外鼻缺损修复重建方法的临床进展

鼻位于面正中突出位置。外鼻缺损修复手术需要同时对其外形和功能进行修复和重建,是一个富有挑战性的临床难题之一。在外鼻缺损修复重建时要遵循亚单位修复和分层重建等原则,同时也要结合鼻缺损实际情况和术者的临床经验选择合适的治疗方法。目前有很多手术方法应用于鼻修复,但是每种方法都有其适应证和优缺点,本文介绍了外鼻缺损常用的手术方法及其注意事项。

Rapid Launch of Medium-Sized Solid Carrier Rockets at Sea With High Reliability and Convenient Intelligence

Gravity-1 solid-propellant carrier rocket utilizes a three-vertical testing and launch mode, and adopts a sea-based launch method. As the demand for satellite launches continues to grow, the scarcity of launch site resources,and the consideration of cost savings, the need for rapid testing and launch of carrier rockets has become increasingly strong. The capability of rapid testing and launch has even become one important aspect of evaluating a rocket. This paper focuses on the characteristics of the Gravity-1 solid-propellant strap-on medium-sized carrier rocket and designs and implements a highly reliable, convenient, and intelligent low-cost rapid testing and launch solution. The main aspects include the design of a highly reliable dual-redundant ground architecture and the application of ground-based shelf products.

中华老字号非遗技艺基本特征

中华老字号非遗技艺具有重要的历史文化价值、科学价值和市场价值,对于老字号非遗的认识应该运用历时性与共时性的方法,重视其自然和谐与实用理性的基本特征。老字号非遗技艺的制作理念反映出不违物性、崇尚自然的特点,老字号非遗技艺制作过程中具有自然选材、环境友好等原则。

基于门控循环神经网络的阀门泄漏检测方法

目的:针对阀门常见的泄漏故障,研究一种阀门泄漏故障检测方法。方法:采用声发射技术与深度学习相结合的方法,通过声发射技术对阀门内漏信号进行了采集,搭建了以门控循环神经网络(GRU)为核心的阀门内漏诊断模型。该方法针对阀门内漏的特点,发挥了声发射技术在无损检测领域上的优越性,并利用GRU捕捉所采集声发射数据的长期依赖性,最终改善了传统循环神经网络的梯度弥散的问题。结果:经过实验和数据分析,提出了基于声发射技术和门控循环神经网络的故障检测方法,从而提升了阀门内漏故障识别的准确率。结论:本方法利用重构的去噪数据进行处理来提高模型效果,并充分发挥GRU在时间序列预测上的优势,最后提升了对阀门微小泄漏检测的精度。