摘要：A simple design of hybrid wavelength division multiplexed/time division multiplexed passive optical network （WDM/ TDM-PON） is demonstrated for the high capacity next generation access （NGA） network, having advantages of both WDM and TDM based PON techniques. A 10 Gbit/s differential quadrature phase shift keying （DQPSK） data signal is used at optical line terminal （OLT） for downstream, whereas a 2.5 Gbit/s inverse return-to-zero （IRZ） data signal with high extinction ratio is used for upstream signal by intensity re-modulation of downstream signal, no additional laser is used at optical network unit （ONU）. Simulation results verify that aggregated 100 Gbit/s downstream transmissions of 10 DQPSK channels and aggregated 25 Gbit/s upstream transmission of 10 IRZ channels, using spectrally-efficient 50 GHz channel spacing, can be successfully achieved over a distance of 20 km with less than 1 dB transmission power penalties and improved receiver sensitivity.

摘要：以明恢63与B5和中国香稻构建的重组自交系为材料,结合分子标记辅助选择恢复基因(Rf3/Rf4)和B5来源的抗稻飞虱基因(Bph14/Bph15)共获得17个恢复系,分别与3个野败型细胞质雄性不育系杂交,采用NCⅡ遗传交配设计,分析了9个农艺性状的配合力、遗传力和相关关系。结果表明:除单株有效穗数外,其他性状的一般配合力均达极显著水平,生育期、每穗实粒数和结实率的特殊配合力差异达到极显著水平。9个性状加性效应占主导地位。大多数农艺性状受不育系影响比较大,仅株高和结实率受恢复系的影响较大。大多数农艺性状的广义遗传力和狭义遗传力均大于60%,仅单株有效穗数和单株产量性状的广义遗传力和狭义遗传力小于50%。单株产量的一般配合力与单株有效穗数、每穗实粒数和结实率的一般配合力呈显著或极显著正相关。播始历期、穗数、每穗总粒数、结实率和千粒重等性状的一般配合力与其表型值间的相关达到显著或极显著水平。

摘要：研究了相干光正交频分复用(CO-OFDM)系统中基于射频导频(RF-Pilot)的交叉相位调制(XPM)补偿的关键技术,提出了基于Pilot位置的补偿优化方案,通过理论分析得到了最优Pilot位置的选取原则和Q因子分布规律,仿真结果证明了理论分析的正确性。针对7信道CO-OFDM系统,最优和最差Pilot位置处的系统性能相差1.6d B,在实际设计中应根据具体信道配置和该信道上XPM损伤的分布情况来选取最优的Pilot位置,以提升补偿效果和系统性能。

摘要：目的构建中西医信息采集系统,既能为代谢综合征个体化诊疗提供信息采集工具,也可作为门诊病历记录工具辅助医生诊疗,进一步研究代谢综合征的中医证候规律,为制定中西医结合治疗方案提供规范化数据,为临床及科研提供依据。方法通过对平台进行需求性、可行性分析,查阅近十年中医信息化研究进展及代谢综合征中西医研究进展情况,制定代谢综合征个体化诊疗平台建立方案;搜集前期研究资料,整理代谢综合征及相关疾病的诊断标准、养生调摄等内容,制定证型判定标准;根据临床需求设计软件界面,设计结构化、标准化系统界面模版,并采用Visual Studio开发软件及C语言初步构建信息采集系统和代谢综合征个体化诊疗平台。结果完成了基于代谢综合征个体化诊疗的信息采集系统。该平台可以实现以下几个功能:初步实现门诊病历录入的结构化、标准化;单机或多客户端联网进行代谢综合征中西医信息采集;将体质调查纳入信息采集,通过大样本临床调查,探究体质与代谢综合征发病的相关性。结论构建出中西医信息采集系统,既满足门诊病历记录需要,又体现出中西医结合特色,全面采集病历信息,为进一步研究代谢综合征提供数据支持。

摘要：Optimization of grain boundary engineering(GBE) process is explored in a Fe–20Cr–19Mn–2Mo–0.82N high-nitrogen and nickel-free austenitic stainless steel, and its intergranular corrosion(IGC) property after GBE treatment is experimentally evaluated. The proportion of low Σ coincidence site lattice(CSL) boundaries reaches 79.4% in the sample processed with 5% cold rolling and annealing at 1423 K for 72 h;there is an increase of 32.1% compared with the solution-treated sample. After grain boundary character distribution optimization, IGC performance is noticeably improved. Only Σ3 boundaries in the special boundaries are resistant to IGC under the experimental condition. The size of grain cluster enlarges with increasing fraction of low ΣCSL boundaries, and the amount of Σ3 boundaries interrupting the random boundary network increases during growth of the clusters, which is the essential reason for the improvement of IGC resistance.

摘要：As the application of energy-absorption structure reaches an unprecedented scale in both academia and industry, a reflection upon the state-of-the-art developments in the crashworthiness design and structural optimization, becomes vital for successfully shaping the future energy-absorption structure. Physical impacting test and numerical simulation are the main methods to study the crashworthiness of railway vehicles at present. The end collision deformation area of the train can generally be divided into two kinds of structural design forms: integral absorbing structure design form and specific energy absorbing structure design form, and different energy-absorption structures introduced in this article can be equipped on different railway vehicles, so as to meet the balance of crashworthiness and economy. In pursuit of improving the capacity of energy dissipation in energy-absorption structures, studies are increasingly investigating multistage energy absorption systems, searching breakthrough when the energy dissipation capacity of the energy-absorption structure reaches its limit. In order to minimize injuries, a self-protective posture for occupants is also studied. Despite the abundance of energy-absorption structure research methods to-date, the problems of analysis and prediction during impact are still scarce, which is constituting one of many key challenges for the future.

摘要：依据地质条件与地形特点,对广州市小谷围岛地铁站基坑采用放坡土钉墙支护,部分地段采用超前钢管加强支护,盾构吊出井、调头井段采用钻孔灌注桩加内支撑支护方案。采用理正软件对不同设计剖面进行了理论计算分析。分析结果表明基坑安全可靠。依据有关规范制定了基坑施工监测方案,针对基坑工程施工监测结果进行了分析,可供同类工程借鉴。

摘要：广州市地铁公园前地下空间基坑依据地质条件分段确定挖孔灌注桩加内支撑、挖孔灌注桩加预应力锚索、土钉墙放坡等多种综合支护方案。由于该基坑平面不同位置深度差异大、紧邻地铁一号线与地铁二号线以及已有车站风井、地下通道等地下构筑物,且地处商业繁华地带。为确保基坑安全,布置详细监测方案。基坑工程实行信息化施工并获得了丰富的监测数据,通过对数据分析结果表明:实测主动土压力小于计算主动土压力,实测主动土压力随时间延长变小;土体中孔隙水压力随时间增长而减小,孔隙水压力随深度增加而呈非线性增加;基坑冠梁协同作用明显,冠梁减小了基坑变形;锚索轴力比较稳定,钢撑轴力变化相对较大,且二者轴力仍富余较大,该设计比较安全。

摘要：对西安市区典型的几个居住区绿地植物种类及其种植形式进行了调查和分析。结果表明:所调查西安住宅区植物种植设计特色不鲜明,从种植设计特色及植物空间营造2个方面给予了讨论,同时结合一些较好的植物配置模式,提出住区植物配置的一些方法与思路,结合实景植物配置图片,以期对其它住区环境植物种植设计提供借鉴。

摘要：为解决汽车悬架运动学特性参数优化难题,提出用数学语言描述悬架运动学特性参数的约束条件,及利用牛顿迭代法进行优化的方法.该方法能快速找出所需调整的设计变量,并能快速有效地搜索到最优解,适合于多设计变量、多目标函数的优化.针对某样车后悬架前束角及外倾角存在的问题,应用该方法对目标函数影响较大的设计硬点坐标值进行优化.结果表明,2次迭代后,使悬架运动学特性达到较为合理的设计状态.