Turbo乘积码对星间光通信链路的性能改善分析

通过联合界技术较为详细地给出了Turbo乘积码的最大似然译码限,并比较了在星间光通信链路中Turbo乘积码和Turbo卷积码及传统级联码的纠错性能.研究表明,Turbo乘积码的纠错性能优于传统级联码以及Turbo卷积码.     

Development of DPSSL and Its Applications

1 Introduction Since the world first laser successfully developed by Maiman [1] in 1960, the research activities in this field has never been stopped. With diode laser pumping, it is possible to built higher efficiency, and therefore simpler and more compact laser in an all solid- state device. With recent progress in the development of reliable higher power diode lasers, parallel improvements in diode - pumped solid - state lasers have been made. Diode laser- pumped solid- lasers also offer …     

Disposal of Waste Plastics With Traditional Coking Process

A new technology for treating waste plastics （WP） by traditional coking process was introduced. With a thermo-balance and a 10 g atmospheric fixed bed reactor, the thermo-gravimetric behavior and product were studied during co-coking of WP with blended coal. And then, using a coke-oven with capacity of 200 kg, the characteristics of products were assessed. The results showed that there is an overlapping temperature range （200-550℃ ） of decomposition between WP and blended coal, and the pyrolysis synergism index η and synergism strength β proposed could evaluate the synergism between them. 1% of added WP results in the maximum synergism in all series experiments. The increase of added WP decreases the synergism. Tar yield in co-coking is increased with the decrease of water yield for synergism. Moreover, it was also found that the quality indexes of coke, such as M10, M40, CRI and CSR, are degraded with the increase of WP until 4%, though the quality of tar and gas is optimized for WP addition.     

内陆核电站低放射性废水排放的三维计算

本研究应用EFDC三维水动力学数学模型,对典型受纳水体富水水库中核电站的低放射性废水排放进行了数值计算。富水水库库容较大、水体较深、水面窄长。先对由排放引起的水库内浓度场的稳定过程和稳定时间进行了预备计算,之后对表层排放、底层排放两种不同的排放方案进行了计算与分析,给出了表、底层排放核素分布的三维结构。模拟结果表明:污染物在环境水域中的运动规律,主要由环境流场决定。水库水深大,水体的稀释能力较强,且有向流速大的水层输移的趋势;不同半衰期物质,其浓度分布因水流输运作用与自衰作用的影响程度不一,同样条件下,半衰期长的核素浓度线包络面积也较大。     

肝癌门静脉支架植入术对门静脉压力的影响

目的研究肝癌门静脉支架植入术对门静脉压力的影响。方法１２例肝癌门静脉主干癌栓患者依次接受食管胃底曲张静脉栓塞和门静脉支架植入治疗，分别测量曲张静脉栓塞前（P１）、栓塞后（P２）和支架植入后（P３）门静脉主干（PV）、未累及的门静脉分支（PVB）、脾静脉（SV）、肠系膜上静脉（SMV）压力并进行统计学分析。结果PV组P１为（４５．１７±２．２５）cm H ２ O，P２为（４８．３３±２．２０）cm H ２ O（P＜０．０１），P３为（３９．３３±２．４４）cm H ２ O，与P２比较差异有显著性（P＜０．０１）。PVB组P１为（３８．０８±２．９７）cm H ２ O，P２为（３８．８３±２．９４）cm H ２ O（P＞０．０５），P３为（３７．４１±２．３７）cm H ２ O，与P２比较差异无显著性（P＞０．０５）。SV组P１为（４４．６７±２．１３）cm H ２ O，P２为（４８．１７±２．２０）cm H ２ O，（P＜０．０１），P３为（４１．６７±２．２０）cm H ２ O，与P２比较差异有显著性（P＜０．０１）。SMV组P１为（４５．２５±２．２１）cm H ２ O，P２为（４８．４２±２．１９）cm H ２ O（P＜０．０１），P３为（４１．２５±２．２４）cm H ２ O，与P２比较差异有显著性（P＜０．０１）。结论门静脉主干癌栓患者食管胃底曲张静脉栓塞可使门静脉压力升高，门静脉支架植入可降低门静脉压力。     

带法兰衬塑复合钢管

带法兰的衬塑复合钢管，是在钢管的两端焊接法兰，而在钢管的内壁和法兰端面衬覆塑料，如图1所示。     

板料折弯机调节机构的改进

通过调节机构的改进,重复精度达到了要求,减少了废品量,节约了成本,提高了生产效率。     

高喷煤比操作对焦炭劣化的影响

为考查提高喷煤量对焦炭在炉内劣化的影响,在宝钢高炉上进行了风口取样研究.结果表明,喷煤量达到200 kg/t以上时焦炭劣化严重.高炉生产实绩回归显示,焦炭的热性能对高炉透气性的影响比冷强度显著.分析认为焦炭热性能指标CRI、CSR对高炉高煤比操作更重要.借此还提出了提高喷煤量和改善焦炭质量需加强研究的课题.     

板式薄层膜通道中压力行为的实验研究

对层流状态下膜分离装置内膜通道中压力行为的特性进行了研究，理论分析了膜通道中出现该压力行为的原因，并用根式膜进行了验证．实验结果证实了理论分析的正确性。     

低温等离子体对天然胶原材料表面改性的研究

采用牛腱中提取的胶原蛋白为原料，制成薄膜试样，在Ｏ２和Ａｒ条件下，用低温等离子体处理天然胶原薄膜的表面．处理后的试样通过电子光谱（ＥＳＣＡ），红外光谱（ＩＲ），Ｘ射线衍射和接触角测量来研究其结构和性能的变化．实验表明：处理后胶原材料的表面、内部结构及化学成分都发生了明显的变化；它与水和二碘甲烷的接触角明显小于等离子处理前的可见低温等离子体方法能用于胶原材料的改性．