Underwater Communication System Algorithm Acoustic Based on FPGA

近年来人们对海洋资源开发的力度不断加大，岸基人员和水下平台、潜水员之间的信息传递变得十分重要。然而水声信道具有多径严重，可用的频带较窄等缺点，这使得信息的水下传输往往比较困难。因此构建一个可靠而且稳定的水声通信系统具有重要意义。 本文以FPGA为硬件平台构建了一种OFDM水声通信系统，该系统具有抗多径、抗窄带干扰、抗频率选择性衰落和可以实现非对称高速速率数据传输等优点。并能够进一步通过配合语音合成和识别技术来实现水下通信的稳定性和可靠性。 本论文主要的研究内容有以下几部分： （1）通过对水声通信原理、OFDM的基本原理和系统的关键技术、VerilogHDL硬件语言深入的学习和研究，完成了...In recent years, the development of marine resources has intensified, the transmission of information between shore-based personnel with underwater platform and the diver becomes very important. For underwater acoustic channel, its multipath is severe, the available bandwidth is narrow, transmission of information underwater is often difficult. Therefore, in order to transfer command and other imp...学位：工学硕士院系专业：信息科学与技术学院_工程硕士(电子与通信工程)学号：2332013115325

Metabolic states of the Taiwan Strait and the northern South China Sea in summer 2012

采用黑白瓶方法,在2012年夏季测定了台湾海峡及南海北部16个站位群落总的初级生产力(grOSS PrIMAry PrOduCTIOn,gPP)和群落呼吸(COMMunITy rESPIrATIOn,Cr),总的初级生产力gPP水柱积分平均值为106.6±7.51MMOl O2 M–2·d–1(MEAn±SE,以下同),群落呼吸Cr平均为131.1±5.95MMOl O2 M–2·d–1,净群落生产力(nET COMMunITy PrOduCTIOn,nPP)变化范围为-179.0~377.6MMOl O2 M–2·d–1(中值为-40.4MMOl O2 M–2·d–1)。受上升流的影响,琼东海域呈现明显的自养状态。在珠江口,由于珠江冲淡水的流入,该区域也呈现自养状态。相反,台湾海峡近岸以及粤东近岸均为异养区域。由此可见,异养区域的群落呼吸并不是完全由本地初级生产力决定,有机碳在空间上的输送对海洋浮游生物群落新陈代谢的影响可能极为重要。We investigated the metabolic states of plankton communities in the Taiwan Strait and the northern South China Sea by measuring gross primary productivity(GPP),community respiration(CR) and bacterial production(BP) at 16 stations in these areas.GPP averaged 106.6 mmol O2 m-2·d-1 with a standard error of 7.51 mmol O2 m-2·d-1.CR averaged 131.1 mmol O2 m-2·d-1with a standard error of 5.95 mmol O2 m-2·d-1.Net community productivity varied from-179.0 to 377.6 mmol O2 m-2·d-1with a median value of -40.4 mmol O2 m-2·d-1.Our results showed that the area affected by Qiongdong upwelling was autotrophic.In the areas affected by the Pearl River discharge,the plankton community was also autotrophic.By contrast,other areas including the Taiwan Strait nearshore waters and the South China Sea open waters were heterotrophic.Therefore,community respiration was not entirely determined by the local primary productivity in the study areas.Our results suggest that the spatial transport of organic carbon plays an important role in determining the metabolic state of the plankton community.厦门大学基础创新科研基金(2011121007、2012121058); 中国科学院南海海洋研究所热带海洋环境国家重点实验室开放课题(LTO1103); 海洋公益性行业科研专项经费项目(201105021-03

固氮酶及合成氨Fe催化剂中N_2的络合位

用乙烯为探针研究了固氮酶中Ｎ２的键合位。结果表明，乙烯不能与Ｎ２在固氮酶体系中相竞争。提出Ｎ２在固氮酶中的键合位很可能是蛋白键合ＦｅＭｏ－ｃｏ笼内６Ｆｅ位的μ６（η２，ε４）和３Ｆｅ＋１Ｍｏ位的μ４（η３，ε１）方式，而不是笼口２Ｆｅ位的μ２（η２）方式，在合成氨Ｆｅ催化剂中Ｎ２的络合方式可能是μ６（η３，ε３）

择优生长CdS纳米微粒膜的制备和性能研究

利用恒电流阴极还原法或电流脉冲法在聚苯胺膜、PATP膜、Au膜和ITO基体上制备了CdS纳米微粒膜 ,并对其结构和紫外_可见吸收等性质进行初步表征 .结果表明基体对CdS微粒膜的结构和性能具有较大的影

固氮酶中N_2和N_2O结合位的一种新的鉴定方法

采用ＧＣ和ＧＣ－ＦＴＩＲ法，研究了Ｎ２和Ｎ２Ｏ对固氮酶催化Ｃ２Ｄ２还原活性及产物二氘代乙烯的反式－／顺式－异构体比值的影响，结果表明，Ｎ２和Ｎ２Ｏ均抑制Ｃ２Ｄ２的还原作用，并引起反式－／顺式－１，２－二氘代乙烯比值的增加．这一变化规律，与根据Ｃ２Ｈ２还原被Ｎ２和Ｎ２Ｏ抑制只发生在固氮酶铁钼辅基（ＦｅＭｏｃｏ）的笼内的假设而近似计算的结果相一致．实验结果和理论计算之间的一致性支持Ｎ２和Ｎ２Ｏ结合在ＦｅＭｏｃｏ的笼内，并主要抑制在笼内的Ｃ２Ｄ２还原的看

Research progress in cigarette combustion model

综述国内外有关卷烟燃烧模型的研究进展。认为应在深入研究卷烟燃烧过程和机理的基础上,建立全面系统准确的卷烟燃烧数学模型,以便为工艺改进提供科学依据。Research progress in cigarette combustion model was reviewed.Suggestions were proposed that comprehensive,systematic and accurate mathematical model of cigarette combustion need to be established based on further research in combustion mechanism to improve blending technique

Growth Performance and Genetic Diversity Analysis of Hybrids Between Selective Lines of Litopenaeus vannamei

对2个凡纳滨对虾(Litopenaeus vannamei)选育系(A和B)的自繁与杂交后代的生长性状及遗传多样性进行了分析.养殖对比实验结果表明,杂交组合AB生长性状优于其他各组,表现出较好的杂种优势.使用11对荧光标记的微卫星引物对4个凡纳滨对虾自繁与杂交群体以及1个从美国引进的初代亲本SIS群体的基因组DNA进行扩增,结果显示除AA群体外,其余4个群体均表现出较丰富的遗传多样性,观测到的平均等位基因数(Na)为4.273~5.636,平均期望杂合度(He)为0.586~0.629,平均多态信息含量(PIC)为0.512~0.556.遗传距离分析结果显示,SIS群体和AA群体的遗传距离最远(0.670 4),而与AB群体的最近(0.131 4).研究结果表明,引自美国的凡纳滨对虾群体经多代自繁后,其遗传多样性水平降低;而选育系间杂交则可使杂交后代的生长性状和遗传多样性水平得到改善.The growth performance and genetic diversity of the inbred and crossbred progenies of two Litopenaeus vannamei selective lines( A and B) were analyzed in this study.The results indicated that AB group showed the best growth performance and heterosis.Eleven fluorescently labeled microsatellite markers were used to amplify microsatellite DNA from five L. vannamei populations.The results showed that four populations( except for AA) displayed higher genetic diversity with average numbers of alleles( Na = 4. 273-5. 636),average expected heterozygosity( He = 0. 586-0. 629),and average polymorphism information content( PIC = 0. 512-0. 556). Nei' s unbiased genetic distance( Ds) indicated a close genetic relationship between populations SIS and AB( Ds= 0. 131 4),while populations SIS and AA showed the farthest genetic relationship( Ds = 0. 670 4).The results demonstrated that the genetic diversity decreased after several generations of selection,while hybridization between different selective lines could improve the growth performance and genetic diversity of L. vannamei.厦门市海洋经济创新发展区域示范项目(13PZY001SF25

Gradient Analysis and Comparison of Landscape Pattern along Different Expansion Axes of Tong'an District in Xiamen City

城市扩展轴上的景观格局梯度变化特征及其变化原因的研究,是了解城市化对城市景观生态影响过程与机制的一个理想途径。本文选取厦门市同安区为研究对象,采用梯度分析结合景观格局分析方法,分别在沿同集路方向与沿往翔安的324国道方向的城市扩展轴上布设样带,通过移动窗口取样,运用景观格局指数进行景观格局梯度分析与比较。结果表明,在斑块类型水平上,沿同集路方向的扩展轴各项指数受城市化影响较明显,沿324国道方向的则不明显;在景观水平上,城市化造成沿同集路方向扩展轴景观形状更为复杂,景观多样性减少,景观格局由原本的多种景观均势并存转变为以城镇景观为主导的格局,景观更为破碎化,而沿324国道方向景观形状没有明显受城市化影响,但城市化促使景观多样性增加,景观格局由原本的以耕地景观为主导的格局转变为多种景观均势并存的格局,景观破碎化程度方面则没有明显受城市化影响。城市化水平的不同造成了城市扩展轴景观格局梯度变化特征的不同,周边地区城市化水平、城市建设布局模式、地域自然景观特征等因素则影响景观格局梯度变化的幅度与峰值的出现。Study on changes of landscape pattern gradient along urban expansion axis and their drivers is an ideal way to understand the urbanization process and mechanism that affect landscape dynamics.Tong'an District of Xiamen has expanded obviously along Tongji Road to Jimei District and the 324 National Road to Xiang'an District in decades.Combining gradient analysis with landscape pattern metrics,we analyzed the changes of landscape pattern gradients along Tongji Road with a 12-km long and 3-km wide transect and along the 324 National Road with a 9-km long and 3-km wide transect,by using moving window technique,and made comparisons between them.The results showed that,at class-level,most landscape metrics along Tongji Road were significantly influenced by urbanization process,while those along the 324 National Road were not.At landscape-level,urbanization along Tongji Road resulted in increases in landscape shape complexity and fragmentation,but decreases in landscape diversity.The uniformly coexistent pattern of the diverse landscapes was converted to an urban landscape dominant pattern.However,along the 324 National Road,urbanization did not obviously affect landscape shape complexity and fragmentation,but increased landscape diversity.The cultivated landscape dominant pattern was converted to a diverse landscape uniformly coexistent pattern.Urbanization level was the key factor that led to the changes in difference between the two urban expansion axes.Results showed that urbanization level along Tongji Road was intermediate but that was primary along the 324 National Road.Other factors also caused landscape pattern gradient changes.Urbanization level of neighboring area,urban construction layout pattern and characteristics of natural landscape in the study area influenced the range and the peak value occurrence of landscape pattern gradient changes.福建省自然科学基金项目(2007J0225

Ru（OAc）_2（Ph_3P）（dppp）、Ru（OAc）_2（dppp）_2

配合物Ｒｕ（ＯＡｃ）２（Ｐｈ３Ｐ）２与不同摩尔比的双膦配体ｄｐｐｐ［ｄｐｐｐ＝双－（二苯基磷）丙烷］或ｄｐｐｂ［ｄｐｐｂ＝双－（二苯基膦）丁烷］在回流的甲苯中反应，分别生成资合双膦钌配合物Ｒｕ（ＯＡｃ）２（Ｐｈ３Ｐ）（ｄｐｐｐ）、Ｒｕ（ＯＡｃ）２（ｄｐｐｐ）２和Ｒｕ（ＯＡｃ）２（ｄｐｐｂ）。这些配合物经元素分析、熔点测定、红外光谱和核磁共振等手段进行了表征。在反应温度３０～６０℃，氢压为３．０ＭＰａ的条件下，发现题示配合物是均相催化丙烯酸和苯乙烯选择氢化的有效催化剂

乌鳢(Channa argus)干扰素刺激基因Viperin和ISG15及其启动子的克隆与特征分析

应用抑制差减杂交、末端快速扩增和基因步移技术,克隆并鉴定了乌鳢干扰素刺激基因Viperin和ISG15及其启动子序列.Viperin cDNA全长1474nt,包含1059nt的开放阅读框,编码352个氨基酸.除N末端70个氨基酸外,Viperin蛋白氨基酸序列在鱼类和哺乳类具有高度的保守性.ISG15 cDNA全长758nt,包含468nt的开放阅读框,编码155个氨基酸,含有两个泛素样(UBL)结构域,C末端具有保守的UB偶联结构(LRGG).Viperin和ISG15启动子区存在保守的干扰素刺激反