“黄优1号”条斑紫菜新品系遗传背景和营养成分分析

【目的】丰富我国北方紫菜(Pyropia)栽培种质,培育优良新品系。【方法】以山东长岛县砣矶岛野生紫菜作为亲本,经过选育,分别采集在南通、日照和砣矶岛海区栽培的"黄优1号"紫菜成体进行遗传背景(rbcL和细胞色素C氧化酶Ⅰ亚基(Cycochrome oxidase subunitⅠ,COⅠ)基因)和营养成分(藻胆蛋白、叶绿素a Chl a、类胡萝卜素Car和可溶性蛋白TSPs)分析。【结果】依据rbcL基因序列(约1 200bp)进行遗传多样性分析,仅砣矶岛养殖绳上全沉水生长的野生紫菜群体与其他品系(群体)具有1.1%的遗传差异,而其栽培群体("黄优1号")的rbcL基因序列与对照条斑紫菜品系完全一致;依据COⅠ基因序列(约680bp),仅南通的两栽培品系("黄优1号"和培育品系2)具有2bp差异,其他品系(群体)的COⅠ基因序列与对照条斑紫菜完全一致。日照海区栽培的"黄优1号"紫菜其营养物质含量比其他海区栽培的"黄优1号"紫菜、野生亲本以及培育品系2高;南通海区栽培的"黄优1号"条斑紫菜品质一般,大部分营养物质含量均低于日照栽培藻体。【结论】由rbcL和COⅠ基因序列推断砣矶岛岸边和养殖绳上的野生紫菜大部分为条斑紫菜,选育品系"黄优1号"为条斑紫菜;在不同海区进行栽培的"黄优1号"条斑紫菜营养成分均优于其野生亲本;初步研究结果表明该品系更适于在日照海区栽培。     

矢量推进自主水下航行器动力学建模及仿真

采用单矢量推进器进行航向控制的自主水下航行器(autonomous underwater vehicle,AUV),与采用传统的鳍舵进行航向控制的AUV相比,具有更好的低速操控性及定位精度.根据单矢量推进式AUV的特点,将AUV的推力视为螺旋桨转速及矢量推进器摆角的函数,运用Newton-Euler法建立了AUV的6自由度运动学模型和动力学模型,采用四阶五级龙格-库塔方法对单矢量推进式AUV动力学模型进行了求解,在Matlab环境下对其动力学行为进行了仿真预测,并通过水域试验验证了所建模型的正确性,为控制系统的设计奠定了基础.     

On algebraic immunity of trace inverse functions on finite fields of characteristic two

The trace inverse functions Tr(λx~(-1)) over the finite field F_(2~n) are a class of very important Boolean functions and are used in many stream ciphers such as SFINKS,RAKAPOSHI,the simple counter stream cipher(SCSC) presented by Si W and Ding C(2012),etc.In order to evaluate the security of those ciphers in resistance to(fast) algebraic attacks,the authors need to characterize algebraic properties of Tr(λx~(-1)).However,currently only some bounds on algebraic immunity of Tr(λx~(-1)) are given in the public literature,for example,the NGG upper bound and the Bayev lower bound,etc.This paper gives the exact value of the algebraic immunity of Tr(λx~(-1)) over F_(2~n),that is,AI(Tr(λx~(-1))) =[2n~(1/2)]- 2,where n ≥ 2,A ∈ F_(2~n) and λ≠ 0,which shows that Dalai's conjecture on the algebraic immunity of Tr(λx~(-1)) is correct.What is more,the authors demonstrate some weak properties of Tr(λx~(-1)) against fast algebraic attacks.     

YFeO_3复合氧化物半导体材料的制备、掺杂和气敏性能研究

用化学共沉淀法制备了YFeO3 及其掺锌固溶体Y1-xZnxFeO3 气敏材料 ,并对其制备条件、相结构、电导和气敏性能进行了研究 .结果表明 :Fe与Y物质的量比为 1 :1 ,85 0℃以上热处理一定时间可得钙钛矿结构的纯相YFeO3 ;电导测量显示 ,该系列材料呈p型半导体导电行为 ,且固溶体导电优于纯相 .Y0 .94Zn0 .0 6FeO3 电导突变温度40 0℃ ,较纯相YFeO3 低 70℃ ;90 0℃下热处理 4h所得微粉制作的元件对乙醇有较高的灵敏度和较好的选择性 .这种材料可望开发为一类新型酒敏传感器     

Straightforward Guess and Determine Analysis Based on Genetic Algorithm

With the development of artificial intelligence, the genetic algorithm has been widely used in many fields. In cryptography, the authors find it is natural to code an individual and design its fitness in a genetic algorithm for a straightforward guess and determine analysis(SGDA, in short).Based on this observation, the authors propose an SGDA based on genetic algorithm. Comparing it with the other three SGDAs based on exhaustive search, MILP method and CPP method respectively,the authors illust...