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排序方式: 共有3208条查询结果,搜索用时 16 毫秒
1.
《International Journal of Hydrogen Energy》2022,47(6):4222-4235
Quantitative Risk Assessment (QRA) supports the development of risk-informed safety codes and standards which are employed to enable the safe deployment of hydrogen technologies essential to decarbonize the transportation sector. System reliability data is a necessary input for rigorous QRA. The lack of reliability data for bulk liquid hydrogen (LH2) storage systems located on site at fueling stations limits the use of QRAs. In turn, this hinders the ability to develop the necessary safety codes and standards that enable worldwide deployment of these stations. Through a QRA-based analysis of a LH2 storage system, this work focuses on identifying relevant scenario and probability data currently available and ascertaining future data collection requirements regarding risks specific to liquid hydrogen releases. The work developed consists of the analysis of a general bulk LH2 storage system design located at a hydrogen fueling station. Failure Mode and Effect Analysis (FMEA) and traditional QRA modeling tools such as Event Sequence Diagrams (ESD) and Fault Tree Analysis (FTA) are employed to identify, rank, and model risk scenarios related to the release of LH2. Based on this analysis, scenario and reliability data needs to add LH2-related components to QRA are identified with the purpose of improving the future safety and risk assessment of these systems. 相似文献
2.
针对空间数据系统咨询委员会(CCSDS)标准下低密度奇偶校验(LDPC)码编码器低硬件实现复杂度的应用需求,提出一种适用于不同码长、码率LDPC码的多路并行编码器实现架构。该架构通过重复利用编码器中的存储单元,将矩阵信息共享到所有并行的运算单元中从而提高资源利用率。进一步,在现场可编程门阵列(FPGA)平台上验证并测试码率分别为1/2、2/3及4/5的单路和多路编码器,测试结果表明采用多路并行架构的编码器吞吐量比单路编码器有明显的提高且均达到1 Gbps以上;与达到基本相同吞吐量的单路多组编码器相比,其查找表资源分别减少40%、44%和46%。该架构充分利用FPGA的存储资源进而有效降低硬件实现复杂度。 相似文献
3.
未来6G系统的通信指标将有显著提升,同时应用场景更加多样化,对编码调制方案提出了更高的要求。面向6G系统,探讨了极化编码调制的应用优势。针对高谱效和低时延传输场景,分别阐述了多级码极化编码调制和比特交织极化编码调制的原理。在实际编码调制系统中,现有极化码构造算法存在复杂度高与灵活性差的问题。针对这些问题,提出了极化编码调制系统的通用构造框架。在多级码极化编码调制和比特交织极化编码调制两种方案下,详细论述了通用构造的具体操作流程。这类构造方法基于“和速率近似”的准则为极化分量码分配码率,能够实现不依赖于实际信道状态的通用构造,并显著降低系统构造的复杂度。仿真结果进一步验证了该方法的灵活性与通用性,并且可以获得比5G LDPC编码调制系统更好的性能。 相似文献
4.
为了解决在喷码过程中出现的喷印信息位置偏移问题,设计了基于喷墨打印平台的赋码定位控制系统。该系统结合机电定位、机器视觉和图像处理技术,是一个集数据处理、电控和机械于一体的复杂系统。赋码定位模块采用工业摄像头对承印物进行图像采集,通过USB3.0高速数据接口进行传输并在数据处理模块进行图像数据定位算法运算,将得到的结果用于控制喷印模块,实现了快速喷印过程中的实时反馈处理。分析了二维码的喷印结果,验证了整个系统的设计,提高了二维码在承印物上的赋码定位精度,以保证包装品的美观度。 相似文献
5.
Handling appearance variations is a challenging issue in visual tracking. Existing appearance models are usually built upon a linear combination of templates. With such kind of representation, accurate visual tracking is not desirable when heavy appearance variations are in presence. Under the framework of particle filtering, we propose a novel target representation for tracking. Namely, the target candidates are represented by affine combinations of a template set, which leads to better capability in describing unseen target appearances. Additionally, in order to adapt this representation to dynamic contexts across a video sequence, a novel template update scheme is presented. Different from conventional approaches, the scheme considers both the importance of one template to a target candidate in the current frame and the recentness of the template that is kept in the template set. Comprehensive experiments show that the proposed algorithm achieves superior performances in comparison with state-of-the-art works. 相似文献
6.
In this paper, a new class of additive codes which is referred to as ?2 ?2[u]-additive codes is introduced. This is a generalization towards another direction of recently introduced ?2 ?4-additive codes [J. Borges, C. Fernández-Córdoba, J. Pujol, J. Rif´a, and M. Villanueva, ?2 ?4-linear codes: Generator matrices and duality, Designs Codes Cryptogr. 54(2) (2010), pp. 167–179]. ?2 ?4-additive codes have shown to provide a promising class of codes with their algebraic structure and applications such as steganography. The standard generator matrices are established and by introducing orthogonality the parity-check matrices are also obtained. A MacWilliams-type identity that relates the weight enumerator of a code with its dual is proved. Furthermore, a Gray map that maps these codes to binary codes is defined and some examples of optimal codes which are the binary Gray images of ?2 ?2[u]-additive codes are presented. 相似文献
7.
8.
Jingjing Liu Yimin Zhou Grahame E. Faulkner Dominic C. O'Brien Steve Collins 《International Journal of Circuit Theory and Applications》2015,43(7):840-853
The ability to create and direct beams of light means that optical communications potentially offer a large power advantage over RF communications for sensor networks. This paper presents an optically powered receiver front end for wireless optical communications. A complete optical receiver front end including a photodetector, clock and Manchester data recovery circuits has been fabricated using the UMC 180 nm CMOS process. A novel modulation scheme is described that has been devised so that this front end can recover the clock and Manchester data from an optical beam. Experimental results show that the total current consumption of the optical receiver front end is as low as 18.8 nA for a 0.5 V supply when a 1 kbps Manchester data and 8 kHz clock signal are successfully recovered. This means that photodiodes on the same substrate as the front end circuits extract enough power from the communications beam to allow the front end to work at distances of up to 10 m from the transmitter. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
9.
由于自由空间光通信严重受到大气湍流引起的光强起伏,光束漂移等问题对通信性能的影响,本文研究了大气信道特性并分析了空时分组编码方案,采用MIMO技术提高自由空间光通信系统的性能。基于MIMO技术下的准正交编码方案不仅可以增强信道的抗衰落能力而且可以提供一定的分集增益和编码增益。在Matlab平台下使用蒙特卡罗模拟方法,对系统的信道容量和误码率进行数值研究。仿真结果表明:采用MIMO技术能够提高信道容量,有效改善误码性能,而且分集数越高,通信质量越好。 相似文献
10.
采用中国与欧洲钢结构设计规范二阶效应理论对单跨3层和双跨5层钢框架二阶弯矩进行设计计算,并与有限元软件Midas/Gen的计算结果进行了比较。中国和欧洲钢结构设计规范均考虑了初始缺陷对二阶弯矩的影响,在理论计算中采用放大侧端弯矩的方法计算二阶效应,中国钢结构设计规范计算结果比有限元计算结果大2%~5%,欧洲钢结构设计规范计算结果比有限元计算结果大7%~15%,中国钢结构设计规范更契合工程实际的需要。 相似文献