Research on Positioning Solution Technology for GPS and BD Dual-mode GNSS Receiver

GNSS，即全球导航卫星系统（GlobalNavigationSatelliteSystem）现已广泛应用于通信、测绘、军工等领域，而且其应用范围仍在不断扩大。出于国防及民用发展考虑，我国自主研究建设了北斗卫星导航系统，继美、俄后也拥有了独自的卫星导航系统。北斗系统的独立运行能力在军事上保证了国家的安全稳定，在民用上也将促进一批产业的发展。为了推广民用领域的应用，保证导航服务的连续性及精确性，与世界上其他卫星导航系统的协作定位尤为重要。藉由我国2012年底对外正式公布了北斗系统接口控制文件（InterfaceControlDocument）这一契机，本文研究了GPS/BD双模情况下接收机定位解...Nowadays GNSS (Global Navigation Satellite System) is widely used in communications, surveying, military and et al. And the application range of GNSS continues to expand. Taking consideration of national defense and civilian development, China has independently developed the Compass Navigation Satellite System, which made it the third country with autonomous Navigation Satellite System after the U...学位：工学硕士院系专业：信息科学与技术学院_通信与信息系统学号：2332011115311

An Improved Satellite Selection Algorithm Based on Optimal Geometry

随着多星座卫星导航技术的发展,卫星选星算法也日趋重要。为了保证导航定位解算的实时处理能力,在所有可见卫星中合理选取部分卫星用于定位解算,是十分必要的。本文提出了一种基于最优几何分布的改进型选星算法,能够选取多于四颗的卫星用于定位,且卫星几何分布近似最优。算法基于最优几何分布,并利用了模糊综合评判来降低gdOP值的计算次数,减少接收机计算负担。仿真结果表明,改进型选星算法较最优几何分布选星算法在gdOP值上增大不多,而gdOP值的计算次数却能显著地降低,因此提升了接收机实时处理能力。Satellite selection algorithm is becoming more and more important with the advent of multi-constellation navigation.To obtain real-time processing, it's essential to limit the number of satellites used for positioning computation among all visible satellites.In this paper, we propose an improved algorithm to select more than four satellites whose geometry is similar to the optimal geometry.Moreover, the computation burden is further lower by limiting the number of times to calculate GDOP value referring to fuzzy comprehensive evaluation method.Simulation shows that the proposed algorithm can get a GDOP value close to the minimal GDOP using traditional optimal algorithm, in spite of a little increase relative to the original algorithm based on optimal geometry, but the number of times to calculate GDOP value is obviously decreased.高等学校博士学科点专项科研基金(20110121120019); 福建省自然科学基金(2011J01372); 福建省国家高技术研究发展计划(2010HZ0004-1

饲喂不同浓度黄曲霉毒素B_1饲料对异育银鲫成鱼的生长和毒素积累的影响

以含不同浓度黄曲霉毒素B1(AFB1)的配合饲料饲喂异育银鲫(Carassius auratus gibelio)成鱼56d,研究异育银鲫成鱼[(122.3±0.7)g]生长、生理反应、肝脏组织学变化、卵巢发育以及鱼体各组织中的AFB1的毒素积累状况。实验分为5个实验组,不同实验组饲料中AFB1含量分别为0、5、20、50、500μg/kg饲料(实测值分别为2.59、4.12、12.39、46.23、454.07μg/kg饲料),每个处理3个平行。在整个实验过程中各实验组均未表现出外部形态和行为异常,各组存活率均达到100%。各实验组异育银鲫成鱼终末体重、摄食率(FR)、特定生长率(SGR)和饲料效率(FE)均无显著差异。饲料AFB1水平对异育银鲫血清总胆固醇(TC)含量、血清谷丙转氨酶(GPT)、谷草转氨酶(GOT)和碱性磷酸酶(AKP)活性均无显著影响。各毒素组血清超氧化物岐化酶(SOD)活性与对照无显著差异。各毒素组肝脏和卵巢均未见明显的组织学病理变化。肌肉和性腺中的AFB1积累量低于FDA食品安全限定标准(5μg/kg)。肝胰脏中的AFB1积累和饲料中的AFB1水平呈对数关系。饲喂AFB1≥50μg/kg饲料使异育银鲫成鱼肝脏AFB1积累超过安全限量标准。结果表明,异育银鲫成鱼至少可耐受AFB1含量达500μg/kg饲料(实测值:454.07μg/kg饲料)56d

MDR1基因多态性与肝癌易感性的关系

目的:探讨MDR1基因位点单核苷酸多态性与肝癌易感性的关系。方法:采用病例对照研究,应用聚合酶链反应限制性片段长度多态性(PCR-RFLP)基因型分析技术测定原发性肝癌组及正常健康对照组各100例MDR1基因G2677T/A位点。以χ2检验比较MDR1多态基因型及相关危险在病例与对照之间分布的差异,采用非条件Logistic回归分析多态基因型与肝癌发生危险度的关系。结果:肝癌组MDR1基因2677A携带型低于健康对照组(P<0.05);经Logistic回归分析发现2677A携带型的个体患肝癌的危险显著降低,2677A携带型暴露于危险因素下患肝癌风险降低。肝癌组MDR1基因2677T携带型高于健康对照组(P<0.05);经Logistic回归分析发现2677T携带型的个体患肝癌的危险增加,2677T携带型暴露于危险因素下患肝癌风险增高。结论:MDR1基因2677A多态性可能是防止肝癌形成的保护因素,2677T多态性可能是肝癌形成的易感因素

Evaluation of chemiluminescence immunoassays kits for detection of influenza A virus

目的考核甲型流感化学发光检测试剂的灵敏度和特异性。方法分别利用病毒分离培养液和入境人群的鼻咽拭子标本考查甲型流感试剂盒的检测灵敏度和特异性。结果化学发光法对H1、H3、H5、H7、H9等亚型的甲型流感病毒株均有很好的检出率,灵敏度明显优于flu A-dOT和dIrECTIgEn Ez flu A;对102份入境人群鼻咽拭子标本的检测灵敏度为97.62%。结论甲型流感化学发光检测试剂具有很好的灵敏度和特异性,适用于口岸现场的甲型流感快速筛查。Objective To evaluate the sensitivity and specificity of chemiluminescence immunoassays kit for detection of influenza A virus.Methods To analyze the sensitivity and specificity of three different assay kits for detection of influenza A virus by using the viral culture liquid and nasopharyngeal swabs from entry-exit travelers.Results The chemiluminescence immunoassays kit had a good detection rate when it was tested against a panel of influenza A virus strains(H1/H3/H5/H7/H9),and its sensitivity was much better than Flu A-DOT kit`s and Directigen EZ Flu A kit' chemiluminescence immunoassays kit used for the detection of 102 nasopharyngeal swabs from entryexit travelers had a detection sensitivity of 97.62%.Conclusion Chemiluminescence immunoassays kit had good sensitivity and specificity, which was fit for the rapid detection of influenza A virus at frontier ports.国家质检总局科技计划项目(2014IK045); 厦门市科技惠民项目(3502Z20144083

Evaluation of convective PCR for the detection of influenza A virus

目的评价热对流PCR应用于口岸现场甲型流感病毒快速检测的效果。方法设计热对流PCR的引物和探针,用于甲型流感病毒的检测。用甲型和乙型流感病毒毒株和入境发热人员的鼻咽拭子样本验证热对流PCR的检测灵敏度、特异性及稳定性,并与市售商品化实时荧光定量PCR试剂比较检测甲型流感病毒的效果。结果通过对8株甲型流感病毒和1株乙型流感病毒毒株进行检测,热对流PCR对H1、H3及H5亚型的甲型流感病毒毒株的检测下限为0.001~0.005HAU,具有较好的检测广谱性,且不与乙型流感病毒发生交叉反应。对155份鼻咽拭子样本进行检测,和实时荧光定量PCR相比,检测灵敏度为94.74%,特异性为97.44%,且具有很好的检测稳定性。结论热对流PCR具有很高的检测灵敏度和特异性,可用于口岸现场的甲型流感病毒快速筛查。Objective To evaluate the efficiency of convective PCR on rapid detection of influenza A virus at frontier ports. Methods The convective PCR primers and probe were designed for the detection of influenza A virus.Influenza A virus strains,influenza B virus strain and nasopharyngeal swabs of entry travelers with fever were used to analyze the sensitivity,specificity and stability of convective PCR. The detection efficiency of convective PCR was compared with commercial Real-time PCR kit. Results A broad detection spectrum of convective PCR was observed in testing 8 influenza A virus strains with different genotypes（H1、H3 and H5）and 1 influenza B virus strain,the detection limit of convective PCR for influenza A virus strain was 0.001 ~0.005 HAU. There was no cross reaction with influenza B virus. When convective PCR was applied to the detection of 155 nasopharyngeal swabs,comparison with Real-time PCR,the detection sensitivity was 94.74%,the detection specificity was 97.44%,and the detection stability was good. Conclusion Convective PCR had a high sensitivity and specificity,was fit for the rapid detection for influenza A virus at frontier ports.厦门市科技惠民计划项目（3502Z20174044）; 国家质检总局科技计划项目（2014IK045）; 福建省自然科学基金项目（2010J01152

基于词向量空间的大规模中文语义网络构建与复杂性分析

当前对于汉语语义层次的语言网络研究方法仅限于静态词典生成以及人工手动生成两种方法,具有很大的局限性。对此,该文从大规模语料库生成的语义空间出发,结合语义空间丰富的语义信息和义类词典资源,提出一种新颖的基于分布语义的语义网络构建策略,并在此基础上探究了由不同性质的语义空间所构建的语义网络的统计特性。相比前人的方法,该文提出的方法优势在于无需依赖人工标注,支持大规模动态语料的网络自动构建。实验结果表明,语义网络具有复杂网络两个典型的特性:小世界效应和无标度特性。此外,由于语义网络描述的是词之间最为本质的语义关系,与不同文体中的措辞、使用习惯、风格等不存在直接的关系,因此当语义网络节点到达一定规模时,语义网络的某些统计特性可能会趋于一致

In Situ FTIR Studies of CO Adsorption on Palladium Loading Zeolite Elec trode

制备载Pd的分子筛电极 ,以CO吸附为探针结合电化学原位FTIR反射光谱 ,首次发现限定在分子筛超笼中的纳米Pd微粒对CO的吸附具有增强红外吸收效应。Adsorption of CO on palladium loading zeolite el ectrode supported on Pt or GC substrate was studied by in situ MSFTIR spectrosco py.The results demonstrated that the geometry of faujasite supercages favors the formation of bridge-bonded CO species.The enhanced IR adsorption of CO adsorbe d on Pd clusters located in the supercages of zeolite has been observed for the first time,which is a new phenomenon and differs from the abnormal infrared effe cts discovered by our group and the surface enhanced infrared absorption phenome non reported in the literature.国家自然科学基金资助项目!(2 99730 35

304不锈钢表面十七氟癸基三甲氧基硅烷的缓蚀性能研究

采用电化学方法对十七氟癸基三甲氧基硅烷在304不锈钢表面的缓蚀性能进行了研究,结果发现,十七氟癸基三甲氧基硅烷对304SS有明显的缓蚀作用,增大了304不锈钢表面的电荷转移电阻,降低了自腐蚀电流密度并且提高了点蚀电位,缓蚀效率高达96%。国家科技支撑计划(2014BAE12B01

In Situ FTIR Spectrocopic Investigations of 1,3-Butanediol Oxi dation on Sb and S Modified Pt Electrodes

运用电化学原位FTIR反射光谱研究了 1,3丁二醇在以Sb和S修饰的Pt电极上的氧化过程。结果表明Sb和S修饰都能抑制 1,3丁醇的解离吸附。红外数据指出Sb的存在使 1,3丁二醇氧化产物同时含有羰基物种和CO2 ,而S修饰的Pt电极上以羧酸物种为主。In the present paper,we studied the surface st ru cture effect of Pt electrode modified with antimony and sulfur adatoms towards 1 ,3-Butanediol oxidation.The results demonstrated that the modification of Sb an d S both inhibited the dissociative adsorption of 1,3-Butanediol into CO,which is the main source of self-poisoning in electrocatalysis of small organic molec ules.At lower potentials,the principal oxidation pathway of 1,3-Butanediol on P t/Sb ad electrode is towards the production of C=O.However,at higher potent ials,the products of CO 2 increased.The presence of S ad inhibited the ox idation of 1,3-BD at low potentials(0 8 V).国家自然基金!(2 99730 35)资