自升式海洋平台地基强度稳定性分析

自升式海洋平台地基强度稳定性是保证作业安全的基本条件。结合土力学理论及有限元分析,提出一套较完整的地基强度稳定性分析方法,并结合一个实际算例,探讨影响地基强度稳定性的几个关键因素,对平台设计人员及使用者具有一定的参考价值。     

浙江枝吻纽虫(Dendrorhynchus zhejiangensis) 热休克蛋白70基因克隆与表达特征研究

采用同源克隆和cDNA末端快速扩增技术(RACE)克隆了浙江枝吻纽虫热休克蛋白70(DzHSP70)基因全长cDNA序列,并利用荧光定量PCR方法,分析了该基因在重金属胁迫下的表达特征。结果表明,DzHSP70cDNA全长2827bp,包括294bp的5’UTR、628bp的3’UTR和编码634个氨基酸残基的1905bp的开放阅读框。HSP70家族的3个签名序列以及细胞质特异性调控基序EEVD等特征元件在DzHSP70中高度保守。重金属离子Fe3+、Pb2+和Cd2+均可上调该基因的表达,其中Pb2+的毒理效应最强。研究结果表明DzHSP70可能参与了机体对于重金属的解毒过程。     

基于电子鼻和HS-SPME-GC-MS方法研究 海水中七氯的快速检测技术

为了建立海水中有机氯农药的快速检测技术, 本文基于电子鼻和顶空固相微萃取气质联用法(HS-SPME-GC-MS)对海水中的七氯进行检测。结果表明, 电子鼻可以识别海水中的挥发性七氯成分及浓度, 最低检测限0.01mg/L。利用线性判别分析方法(LDA)的累计判别贡献率和欧氏距离、判别函数法、相关性对未知样品的识别率均达到了80%以上, 具有良好的区分效果; PLS模型预测七氯浓度跟实际值之间的相对误差在0.49%—16%之间。HS-SPME-GC-MS检测浓度小于0.10mg/L时, 相对误差在10%左右; 而大于此浓度时, 相对误差随之增大。检测到的主要挥发性物质基本呈现规律性的变化, 与电子鼻确认结果一致。对比两种检测技术, 发现电子鼻检测方法比HS-SPME-GC-MS更迅速、灵敏, 检测限更低, 相对误差也更小, 仪器便携、投资相对较小。     

新一代天气雷达汇流环及直流电机的维护

新一代天气雷达天馈系统发生的故障,多由汇流环和直流电机引起.在日常维护中,如果对汇流环和直流电机进行了充分的清洗和维护,可以有效降低故障次数,及时发现故障隐患并且排除,提高雷达的可用性.对汇流环,应按一定步骤,定时清洁汇流环内粉尘;对直流电机,2个月对电机表面和碳刷内腔清洁一次.     

中国书法艺术家：李晔

李晔,自幼喜欢书画、音乐,现为紫龙宾虹（北京）国际书画院常务副院长,现任中国书画院高级院士,吉吉社区剧社社长、华夏诗联书画艺芳研究院研究员、北京诗词学会会员、中国国际书画术术交流中心副秘书长。为此京市奥组委授予福娃贡献奖。     

分形节理岩体强度与变形尺度效应的试验研究

根据强度与变形尺度效应的研究需要,试验研究了脆性岩石相似模拟材料的配比,提出了预置材料产生模拟节理的方法,解决了随机分布节理试件的制作问题。采用分形分布节理模拟材料试件,研究了脆性岩体轴向抗压强度与变形的尺度效应,获得的规律与实际岩体尺度效应规律一致,并发现岩体变形的尺度效应并非完全由节理闭合和剪切破坏引起,在节理剪切破坏之前,主要是由节理的剪切变形增大引起的。     

AUV Local Path Planning Based on Acoustic Image Processing

The forward-looking image sonar is a necessary vision device for Autonomous Underwater Vehicles （AUV）. Based on the acoustic image received from forward-looking image sonar, AUV local path is planned. When the environment model is made to adapt to local path planning, an iterative algorithm of binary conversion is used for image segmentation. Raw data of the acoustic image, which were received from serial port, are processed. By the use of ＂Mathematic Morphology＂ to filter noise, a mathematic model of environment for local path planning is established after coordinate transformation. The optimal path is searched by the distant transmission （Dt） algorithm. Simulation is conducted for the analysis of the algorithm. Experiment on the sea proves it reliable.     

Construction of a cDNA library for sea cucumber <Emphasis Type="Italic">Acaudina leucoprocta</Emphasis> and differential expression of ferritin peptide

Acaudina leucoprocta is an edible sea cucumber of economic interest that is widely distributed in China. Little information is available concerning the molecular genetics of this species although such knowledge would contribute to a better understanding of the optimal conditions for its aquaculture and its mechanisms of defense against disease. Therefore, we constructed a cDNA library and, based on bioinformatics analysis of the sequences, the functions of 75% of the cDNAs were identified, including those involved in cell structure, energy metabolism, mitochondrial function, and signal transduction pathways. Approximately 25% of genes in the library were unmatched. The gene for A. leucoprocta ferritin was also cloned. The predicted amino-acid sequence of ferritin displayed significant homology with other sea-cucumber counterparts but indicated that it was a new member of the ferritin family. Semiquantitative real-time RT-PCR indicated the highest levels of ferritin mRNA expression in the intestine. A polyclonal antibody of ferritin was also produced. These data provide a set of molecular tools essential for further studies of the functions of ferritin protein in A. leucoprocta.     

基于部分输出FFT的CSK信号高效解调算法CSCD

为了实现精密星历数据的高速率播发,码移键控(CSK)调制技术将是下一代卫星导航系统的重要选项.CSK调制信号在解调时需要遍历计算各种码相位偏移的相关值,因此通常使用基于快速傅里叶变换(FFT)的频域解调算法.根据CSK频域解调仅需FFT部分输出结果的特点,提出了基于部分输出FFT的CSK信号频域解调算法.该算法对传统FFT的蝶形解算结构进行优化,通过定义计算节点以消除与输出结果无关的计算,从而降低解调的计算复杂度.以码率为1.023 Mcps的CSK(4,1023)调制信号为例,所提算法可节省约45.6%的计算量,这对下一代卫星导航接收机的设计具有重要的意义.