Implementation of an 8-bit bit-slice AES S-box with rapid single flux quantum circuits

Rapid single flux quantum (RSFQ) circuits are a kind of superconducting digital circuits, having properties of a natural gate-level pipelining synchronous sequential circuit, which demonstrates high energy efficiency and high throughput advantage. We find that the high-throughput and high-speed performance of RSFQ circuits can take the advantage of a hardware implementation of the encryption algorithm, whereas these are rarely applied to this field. Among the available encryption algorithms, the advanced encryption standard (AES) algorithm is an advanced encryption standard algorithm. It is currently the most widely used symmetric cryptography algorithm. In this work, we aim to demonstrate the SubByte operation of an AES-128 algorithm using RSFQ circuits based on the SIMIT Nb03 process. We design an AES S-bbox circuit in the RSFQ logic, and compare its operational frequency, power dissipation, and throughput with those of the CMOS-based circuit post-simulated in the same structure. The complete RSFQ S-bbox circuit costs a total of 42237 Josephson junctions with nearly 130 Gbps throughput under the maximum simulated frequency of 16.28 GHz. Our analysis shows that the frequency and throughput of the RSFQ-based S-bbox are about four times higher than those of the CMOS-based S-bbox. Further, we design and fabricate a few typical modules of the S-box. Subsequent measurements demonstrate the correct functioning of the modules in both low and high frequencies up to 28.8 GHz.     

苯甲酸、邻羟基苯甲酸和对羟基苯甲酸在银胶粒中的表面增强喇曼散射

在银胶体中进行了苯甲酸、邻羟基苯甲酸(又名水扬酸)和对羟基苯甲酸的表面增强喇曼散射。得到并分析了这三种分子的增强喇曼谱。这三个分子都含有ν(C—CO₂^-)伸缩振动。水扬酸和对羟基苯甲酸是同分异构体,都含有ν(C—OH)伸缩振动,但处于不同位置上。借此我们分析了相对于表面不同距离和不同取向下的增强因子变化,并与纯电磁理论的球形颗粒模型进行了比较。发现了明显的分歧,讨论了可能的原因。还讨论了凝聚对增强因子的影响,并提出了控制胶体凝聚的可能途径。 关键词：     

超声下细针穿刺改良小针刀在腕管综合征治疗中的应用效果

本研究探讨利多卡因+曲安奈德+VitB12混悬液注射联合超声下细针穿刺改良小针刀治疗腕管综合征患者的效果。选取60例腕管综合征患者作为研究对象,采用随机数字表法分为研究组和对照组,各30例,研究组采用利多卡因+曲安奈德+VitB12混悬液注射联合超声下细针穿刺改良小针刀治疗,对照组采用利多卡因+曲安奈德+VitB12混悬液注射联合传统小针刀治疗。治疗1个疗程、2个疗程、3个疗程后的视觉模拟疼痛程度量表(VAS)评分均低于对照组(P<0.05);治疗后,研究组患者的症状严重性量表评分、功能状态量表评分低于对照组,差异具有统计学意义(P<0.05),研究组患者的正中神经感觉传导速度快于对照组(P<0.05),研究组的运动末端潜伏期短于对照组(P<0.05);治疗3个疗程后,研究组的总体治疗效果优于对照组(P<0.05)。利多卡因+曲安奈德+VitB12混悬液注射联合超声下细针穿刺改良小针刀治疗腕管综合征能有效改善患者的临床症状,提高临床治疗效果。