一种基于混沌的随机数发生器设计及其IC实现

在密码学、仿真学以及集成电路测试等许多领域 ,随机数起着重要的作用。在密码学中 ,通常要求所使用的随机数具有不可预测性。基于混沌现象 ,使用开关电容技术 ,用集成电路实现了一种硬件随机数发生器。测试结果表明 ,其产生的序列具有不可预测性 ,可以满足密码学的应用要求。     

新闻直播系统中字幕机备份及应急处理实例

简单介绍新闻直播系统中字幕机的接入方法、备份机制、数据共享以及应急处理方案。     

乙炔黑吸附聚合制导电聚苯胺

用乙炔黑吸附化学聚合新工艺制备导电聚苯胺，可保持电导率不变，但转化率和堆密度提高，并明显改善了聚苯胺的颗粒形态和制膜加工性，使由其制备的聚苯胺复合正极膜和固体聚苯胺锂蓄电池的电化学性能得以改进。     

柴油机针阀体的乙炔低压渗碳

乙炔低压渗碳可以有效地避免在真空渗碳过程中产生炭黑和焦油，同时由于乙炔具有较高的供碳能力，使这一技术尤其适用于针阀体这样的小直径深盲孔零件。     

Pretreatment and physical activation of acetylene cokes

Pretreatment of acetylene cokes at 450 °C with a mixture of nitrogen, oxygen and water vapour creates a relatively large surface area and some initial microporosity, further developed by water activation at 800 °C. For the same degree of burn-off, but without pretreatment, large micropores (L > 2–3 nm) are obtained and the external surface area remains small.     

CZF90测井中子发生器使用寿命浅谈

Ｃ／Ｏ测井中采用同步测量技术来分析非弹性γ与俘获γ，但在一些ＭＳＩ Ｃ／Ｏ测井中发现非弹性γ的一小部分或一大部分超前于非弹性门而进入俘获门，我们把这一问题叫做“错位”。“错位”使得Ｃ／Ｏ的ＣＩ值不正常，测井曲线不合格。这样的仪器不能用来测井。吉林油田测井公司碳氧比维修班成功地解决了Ｃ／Ｏ仪器“错位”等技术难题，在该油田所使用的ＣＺＦ９０－９４－０９发生器已测井８８口，累计打靶时间２３０ｈ，并且至今     

燃煤MHD发电Cr25Al5电极材料的腐蚀行为研究

采用Ｃｒ＿（２５）Ａｌ＿５合金进行煤渣／种子条件下静态腐蚀试验（温度１３７３－１５７３ｋ，时间５０－１５０ｈｒ），试验后得出三种温度下腐蚀重量变化与腐蚀时间的关系，并借助金相显微镜、扫描电镜和俄歇分析进行有关形貌及成份分析，试验表明，温度是材料腐蚀的主要因素，在１４７３ｋ条件下材料的抗蚀性最好，Ａｌ、Ｓｉ元素在腐蚀过渡层中富集，Ｃｒ元素变化不大，但有从基体向外扩散的趋势。由此，这一材料若能进一步改进，可望在控制壁面温度的半热壁型通道中进行试验研究。     

A guided wave inspection technique for nuclear steam generator tubing

The utility of guided ultrasonic waves for increasing the efficiency and sensitivity of nuclear steam generator tubing evaluation by nondestructive means is explored. The basic theoretical background of guided waves in tubes is presented, with major emphasis placed on those results with direct relevance to NDE applications. The possibility of increasing the inspection range of the guided wave modes as well as their sensitivity to defects by proper choice of mode and frequency is also discussed.     

Quantitative evaluation of generator power control effect of FACTS controllers for power system stabilization

The advancement of power electronics technologies has significantly developed the power system stabilizing controllers. Quantitative as well as qualitative evaluation of their effectiveness in power systems is a matter of great importance for the feasibility investigation of these apparatus. In this paper, the possible control region of FACTS controllers with series and/or shunt configuration in a single machine to infinite bus system is formulated in the powerangle curve with a set of algebraic equations. The effectiveness of TCPST (Thyristor‐Controlled Phase Shifting Transformer), SSSC (Static Synchronous Series Compensator), and TCSC (Thyristor‐Controlled Series Compensator) for the improvement of the transient stability is evaluated quantitatively as a numerical example. The correctness of the proposed method has been confirmed by analysis based on the electromagnetic transients simulation with a detailed system model. © 2001 Scripta Technica, Electr Eng Jpn, 138(3): 43–51, 2002     

国产550MW水轮发电机用新材料和新工艺

介绍了二滩水电站 5 5 0MW机组发电机定转子绕组方面所采取的新结构、新工艺和新材料