快速TAUP变换模块在FOCUS下的实现和应用

TAUP域变换以能压制多次波与提高信噪比已被广泛用于地质资料处理中,但用该模块在FOCUS系统下批量处理时运算速度缓慢,效率极低。为此,在深入分析ITA系统下相对运算速度较快TAUP域变换模块的原理与算法的基础上,提出了快速度变化算法,并自编了快速度变化模块,经过实际数据的测试对比,新编快速TAUP变换模块在相同变换参数情况下的计算速度比原有模块快1．3—3倍,极大地提高了生产效率。     

一种TD-SCDMA系统中的新功率控制算法

TD-SCDMA系统中的功率控制具有周期长(5 ms)、频率低(200 Hz)的特点,使用传统的定步长功率控制算法不能很好对抗快衰落.利用TD-SCDMA系统上下行信道对称的特点,提出了一种基于预测补偿的多步长分散功率控制算法.该算法执行闭环多步长功率控制算法,产生功率控制调整量,利用下行信道的衰落对上行信道的衰落进行预测,产生辅助的功率控制调整量,2个功率控制调整量相结合,形成总的功率调整量.仿真显示该算法在快衰落环境下具有良好的性能.     

声音

"嫦娥二号成功发射,‘天河一号’成为全球最快超级计算机,深海载人潜水器海试首次突破3700米水深纪录,京沪高铁全线铺通,水稻基因育种技术获突破性进展,揭示致癌蛋白作用新机制,实验快堆实现首次临界,实现16公里自由空间量子态隐形传输,‘大熊猫基因组’发表,煤代油制烯烃技术迈向产业化。"     

彩云阁快繁技术的研究

通过愈伤组织诱导途径进行快繁,由茎段诱导愈伤组织阶段和愈伤组织诱导芽阶段的最佳PGR种类和浓度配比分别为2mg/L6-BA+0.5mg/L2,4-D+0.1mg/L NAA、3.0mg/L6-BA+0.1mg/L NAA;通过促进腋芽生枝途径进行快繁,茎节诱导芽阶段最佳PGR种类和浓度配比为1.5mg/L6-BA+0.3mg/L NAA;由芽诱导生根阶段最佳PGR种类和浓度配比为0.1mg/L NAA.     

谈发电厂备用电源自投回路的改造与快切装置的应用

当机组或厂用工作电源发生故障时,为了保证厂用电不中断及机组安全有序地停机,不扩大事故,必须尽快把厂用电电源从工作电源切换到备用电源。因此对发电厂传统的备自投回路进行改造并且采用微机集成电路保护型的快切装置就非常必要了。     

Performance and EXIT analysis of parallel concatenated space time trellis codes

Space time trellis coding (STTC) techniques have been proposed to achieve both diversity and coding gains in multiple input multiple output (MIMO) fading channels. But with more transmit antennas STTCs suffer from the design difficulty and complexity increasing. This paper proposes a scheme, named parallel concatenated space time trellis codes (PC-STTC), to achieve the tradeoff between the performances and complexity of STTCs for a large number of transmit antennas. Simulation results and complexity comparison are provided to demonstrate the performance and superiority of the proposed scheme over conventional schemes in fast fading channels in low signal-to-noise ratio (SNR) regions. And an EXIT (extrinsic information transform) chart is given to analyze the iterative convergence of the proposed scheme. It shows that PC-STTC has better iterative convergence in low SNR regions.     

聚丙烯酸脂高吸水交联小球的制备与表征

采用反相悬浮法、氧化还原引发体系,合成了直径达毫米级的聚丙烯酸钠吸水小球.应用FT-IR证实了小球的化学结构,用DSC研究了交联剂用量对小球玻璃化转变温度的影响.研究发现,m(氧化剂):m(还原剂)为1.0:1.2、用量为单体质量的1.0%、w(交联剂)为5%、w(油):w(水)为5～7、分散剂为单体质量的0.2%,搅拌速度为200～250r/min时,合成的小球粒径较大且均匀,粒径达2.48mm,吸水后的小球直径可达10mm左右.小球的玻璃化转变温度值随交联剂用量的增加而降低.     

The design and calculation of the delayed neutron detection system for PWR and CEFR

This paper discussed the importance of the delayed neutron detection system. We improved the delayed neutron detection station and delayed neutron detector, so the noise was greatly decreased and the detection efficiency was greatly increased. After the improvement the stability of the detector was enhanced and the false alarm was eliminated. We introduced the principle of the gas lift pump designed for the sodium cooled fast reactor. A calculation model of the failed fuel detection system of CEFR was proposed, and from the model a code using LabWindows/CVI was developed. The minimum broken area that could be detected by the delayed neutron detection system of CEFR was calculated and the delayed neutron detection signal in a few representative transient conditions during fuel failure happened was stimulated.     

重子数守恒对净质子快度分布的影响

从相对论重离子碰撞的非均匀集体流理论出发,分别讨论AGS、SPS和RHIC能区的净质子分布特征.与以前计算净质子分布不同的是,考虑了在相对论重离子碰撞中重子数守恒,通过重子数守恒限制,可以对RHIC能区的净质子分布在远离中心区的快度分布进行预言.     

快插式制动管路接头的结构设计

介绍了一种利用橡胶密封圈和塑料卡环实现待插管锁紧的新型快插式接头结构.此种管接头与现行的螺纹卡套式管接头的连接方式相比,省去了常用的衬套、卡套和卡套式螺母三件套,是一种快捷、高效的连接方式.