排序方式: 共有87条查询结果,搜索用时 15 毫秒
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硒卡拉胶囊对幽门螺杆菌相关性胃炎的治疗 总被引:1,自引:0,他引:1
对152例幽门螺杆菌慢性胃炎病人采用常规抗生素治疗和抗生素加硒卡拉胶囊治疗。结果表明,硒卡拉胶囊和常规抗生素均能改善慢性胃炎病人反酸、胃胀、嗳气等症状,两者合用则效果更好,胃炎病人症状好转率和HP清除率均显著优于单用(P〈0.05),说明传统疗法与硒配伍治疗慢性胃炎能更好地改善临床症状,提高治愈率。 相似文献
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Lower bound for the security of differential phase shift quantum key distribution against a one-pulse-attack 下载免费PDF全文
Quantum key distribution is the art of sharing secret keys between two distant parties, and has attracted a lot of attention due to its unconditional security. Compared with other quantum key distribution protocols, the differential phase shift quantum key distribution protocol has higher efficiency and simpler apparatus. Unfortunately, the unconditional security of differential phase shift quantum key distribution has not been proved. Utilizing the sharp continuity of the von Neuman entropy and some basic inequalities, we estimate the upper bound for the eavesdropper Eve's information. We then prove the lower bound for the security of the differential phase shift quantum key distribution protocol against a one-pulse attack with Devatak-Winter's secret key rate formula. 相似文献
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Recently,a round-robin differential phase-shift(RRDPS) protocol was proposed[Nature 509,475(2014)],in which the amount of leakage is bounded without monitoring the signal disturbance.Introducing states of the phase-encoded Bennett-Brassard 1984 protocol(PE-BB84) to the RRDPS,this paper presents another quantum key distribution protocol called round-robin differential quadrature phase-shift(RRDQPS) quantum key distribution.Regarding a train of many pulses as a single packet,the sender modulates the phase of each pulse by one of {0,π/2,π,3π/2},then the receiver measures each packet with a Mach-Zehnder interferometer having a phase basis of 0 or π/2.The RRDQPS protocol can be implemented with essential similar hardware to the PE-BB84,so it has great compatibility with the current quantum system.Here we analyze the security of the RRDQPS protocol against the intercept-resend attack and the beam-splitting attack.Results show that the proposed protocol inherits the advantages arising from the simplicity of the RRDPS protocol and is more robust against these attacks than the original protocol. 相似文献
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从一个常见的不等式谈起,分析了多种证明方法,运用该不等式推导出了多个重要结论,对不等式进行了扩充和加强,解释了蕴含的意义,显示了该不等式的重要性和深刻性. 相似文献
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微小空间碎片超高速撞击航天器表面, 能够抛射出高密度的等离子体云团, 如果撞击发生在航天器的高充电表面或带电部件等敏感区域, 撞击等离子体将会诱发放电, 该机制已经引起了广泛的关注, 但是相关研究还十分欠缺. 本文利用等离子体驱动微小碎片加速器加速200 μm的微粒, 通过模拟实验开展微小空间碎片撞击诱发放电的研究, 获得了典型的实验结果, 对撞击诱发放电信号的特征进行了分析.
关键词:
微小空间碎片
撞击诱发放电 相似文献
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胡芦巴炮制前后水煎剂中微量元素分析 总被引:1,自引:0,他引:1
对胡芦巴及其炮制品水煎剂中微量元素进行了测定,其中盐胡芦巴煎剂中微量元素(除Fe外)均呈上升趋势,炒胡芦巴中微量元素呈不同的高低变化,无规律可循。 相似文献