一起64k复用保护通道故障的处理

通过分析64 k复用保护PCM光纤通道的结构,介绍了500 kV郑州变至嵩山变一起64 k差动复用保护通道故障,并分析了故障处理过程。通过此次故障检修,阐述了64 k复用保护通道故障处理思路,说明了64 k通道测试的方法,并提出保护通道组织配置的一些建议,供电力系统通信运行维护人员参考。     

基于IP-core的64位PCI接口设计与实现

介绍一种Linux下的基于64位PCI总线和多片FPGA的高速计算平台的设计和实现,利用Altera公司的PCI软核——PCI_mt64构建此平台的PCI桥接口模块,设计出一种兼容总线宽度64位/32位、时钟66MHz的PCI规范的接口模块,以及与此相配合的DMA状态机,并给出Linux驱动的关键部分。     

基于ATMEGA64单片机多目标超声波测距系统研制

为解决测距系统处理精度差,探测速度慢的问题,该文采用ATMEGA64单片机开发了一种超声波测距系统。系统采用模块化的结构设计,包括回声定位模块、主机模块、音频模块和上位机。超声波传感器可以旋转180°,可实现多目标的测距和报警,并能显示目标的方位。该系统探测速度快,测量精度高,测量盲区小,运行稳定、可靠,具有较大的推广应用价值。     

酸性矿山废水处理技术研究进展与展望

酸性矿山废水(Acid mine drainage,AMD)因酸性强,常含有重金属,并且流动性强,污染范围广,其造成的环境污染已然成为困扰矿山生态修复最复杂的问题之一.本文系统性的介绍了AMD的成因和危害,并着重对目前应用于AMD矿山生态修复的技术进行了系统性总结.目前针对AMD的环境修复技术主要分为两大类,即源头控制...     

Midori64分组密码算法的积分攻击

积分攻击是一种重要的密钥恢复攻击方法,已被广泛应用于多种分组算法分析任务.Midori64算法是一种轻量级分组密码算法,为对其进行积分攻击,构建3个6轮零相关区分器,将其分别转化为6轮平衡积分区分器并合成为一个性质优良的6轮零和积分区分器,将该零和积分区分器向前扩展1轮得到一个7轮零和积分区分器.分别采用部分和技术与快...     

Liquid crystalline elastomer actuators with dynamic covalent bonding: Synthesis,alignment, reprogrammability,and self-healing

Liquid crystalline elastomers (LCEs) have demonstrated tremendous potential in applications such as soft robotics, biomedical materials, electronics, sensors, and biomimetic systems. The physical properties of LCEs are controlled by the degree of crosslinking, nature of the mesogens, and mesogen orientation in the LCE network structure. A wide range of dynamic covalent bonds (DCBs) capable of dynamic bond exchange reactions (DBERs) have been introduced into LCE structures to obtain intelligent materials in recent decades. In this review article, we discuss the molecular constitution, macrostructure, morphing mechanism, recent advances in LCEs with dynamic covalent bonds, the influence of DCBs on self-healing, reprogramming and reprocessing properties of LCE actuators, and challenges and opportunities in incorporating dynamic chemistry in the field of LCE actuators.     

基于RS485和RS232的机车总线控制器设计

随着现代机车运行速度和运载能力的提高，为了保证机车的安全运行，需要准确采集机车运行的各种参数来进行数据的监控、管理和机车控制，此外也可以为故障诊断提供数据支持，因此需要开发一套可以准确、高速传输数据的大容量机车总线控制系统；设计了基于RS485和RS232的机车总线控制器，详细阐述了以STC8G2K64S4芯片为核心的主控模块、电平转换模块、时钟模块、电源模块和LED指示灯模块的硬件设计以及相互之间的软件逻辑控制和所用通信协议，通过4个串口实现程序的下载以及数据的交换；主要的交换参数包括电压、电流、总有功功率、频率等这些机车运行数据；测试结果表明该机车总线控制器可以高速、准确、及时的传输各个设备生成或采集到的数据，为后续的数据分析提供了支持。     

Hill Matrix and Radix-64 Bit Algorithm to Preserve Data Confidentiality

There are many cloud data security techniques and algorithms available that can be used to detect attacks on cloud data, but these techniques and algorithms cannot be used to protect data from an attacker. Cloud cryptography is the best way to transmit data in a secure and reliable format. Various researchers have developed various mechanisms to transfer data securely, which can convert data from readable to unreadable, but these algorithms are not sufficient to provide complete data security. Each algorithm has some data security issues. If some effective data protection techniques are used, the attacker will not be able to decipher the encrypted data, and even if the attacker tries to tamper with the data, the attacker will not have access to the original data. In this paper, various data security techniques are developed, which can be used to protect the data from attackers completely. First, a customized American Standard Code for Information Interchange (ASCII) table is developed. The value of each Index is defined in a customized ASCII table. When an attacker tries to decrypt the data, the attacker always tries to apply the predefined ASCII table on the Ciphertext, which in a way, can be helpful for the attacker to decrypt the data. After that, a radix 64-bit encryption mechanism is used, with the help of which the number of cipher data is doubled from the original data. When the number of cipher values is double the original data, the attacker tries to decrypt each value. Instead of getting the original data, the attacker gets such data that has no relation to the original data. After that, a Hill Matrix algorithm is created, with the help of which a key is generated that is used in the exact plain text for which it is created, and this Key cannot be used in any other plain text. The boundaries of each Hill text work up to that text. The techniques used in this paper are compared with those used in various papers and discussed that how far the current algorithm is better than all other algorithms. Then, the Kasiski test is used to verify the validity of the proposed algorithm and found that, if the proposed algorithm is used for data encryption, so an attacker cannot break the proposed algorithm security using any technique or algorithm.