Design and Implementation of Android User Information Security Management Platform

随着经济和技术的不断发展，智能市场日渐强大，智能手机的普及度也越来越广。目前，Android系统占市场最大，正是由于Android的使用范围广，随之也给Android手机带来了威胁，对Android手机的安全性要求也越来越高。对于智能手机，它是一个年轻的平台，该平台的安全技术远远未能达到PC的水平，对于手机信息的保护及其重要。本文从用户信息方面，以计算机相关安全技术为基础研究手机平台的安全性问题。分析出手机比较重要、隐私的信息，然后根据Android系统的结构，找到相应的提高用户信息安全的解决方案。 本文主要从短信加密、短信通讯录备份恢复、程序开启加锁和进程监控及管理入手，设计一个用户信息安...With the intelligence market increasingly powerful, the popularity of smart phones more widely. What’ more, Android accounts for the largest market. With the increase of users, Android security problems more and more interesting, the Android mobile phone security requirements have become more sophisticated. On smart phones, it's a platform for young, which hardly reach the level of PC security tec...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323051

Optical Fiber Polarization Adjustment and Microwave Signal Generation Using Optical Frequency Multiplication Technology

随着光网络传输速率的不断提高和传输距离的不断增大，各种复杂的偏振现象逐渐突显出来。光纤传输的偏振问题已经成为限制高速率大容量光纤通信、以及目前正在兴起的相干光通信系统发展的瓶颈，各种偏振光的产生与控制已成为研究的一个热点。与此同时，为了实现微波毫米波信号的长距离传输，并充分利用无线传输的灵活性和光纤传输的大带宽，人们提出将微波信号加载到光纤中进行传输，形成了微波光子学这门新兴学科。光生微波毫米波技术是微波光子学的一个重要研究内容。 本文首先对采用光纤技术进行偏振态的调整和变换进行了理论分析和实验研究。本文首次通过一种新的方法，即将一段单模光纤与保偏光纤熔接，通过对熔接点的扭转，在光纤两头固定...With the increase of the optical transmission rate and distance, the optical fiber polarization effect can’t be ignored anyway and the fiber polarization control has become a key issue. At the same time, in order to take advantages of the wireless transmission flexibility and the fiber transmissionon high bandwidth, a new research subject, Microwave Photonics, was put forward. Optical generation t...学位：理学硕士院系专业：信息科学与技术学院电子工程系_无线电物理学号：2312007115013

SBS分子结构对其在选择性溶剂中自组装行为的影响

线形两嵌段(SB)、线形三嵌段[(SB)2]和星形四臂三嵌段[(SB)4]的苯乙烯-丁二烯嵌段共聚物(SBS)溶于选择性溶剂丁酮后的聚集自组装行为差异极大。粘度测定和透射电镜观察结果表明,在溶液中,(SB)4由其内部聚丁二烯嵌段(PBD)聚集自组装成单分子核-壳结构;(SB)2在低于转折浓度时由多个分子的PBD聚集自组装成开放式核-壳结构,在高于转折浓度时则成为稳定聚集体;而SB自组装成为宏观不溶的特大胶体微粒

Biomass and growth analysis of Paspalum wettsteinii community in South Fujian, China

禾本科多年生牧草宽叶雀稗适宜在福建南亚热带丘陵酸性赤红壤上生长,人工种植的宽叶雀稗群落鲜草产量峰值在8月份,为4050g·m-2,生物量峰值(干重)则出现在9月份,其中地上部1398.8 g·m-2、地下部770.8g·m-2。群落全年生长呈周期性变化,生物量波动符合Logistic曲线:y=1634.46/(1+e2.67976-1.3.369×10-2t)。根据9月份最高现存量估计,其年净第一性生产力为2169.6g·m-2·a-1。群落生长分4个阶段:缓慢增长(2～4月)、加速增长(5～6月)、减速增长(7～9月)、生长停滞和下降(10～12月)。降雨量是影响生物量的重要因素,二者呈显著线性正相关,相关系数为0.9783,回归方程为y=-74.3779+0.9480x。Paspalum wettsteinii Hackel, a kind of perennial herbages of Graminaea, was proved to get good adaptation to hilly crimson soil in the southern part of subtropical zone in Fujian Province. Its growth curve fluctuated periodically within a year. The biomass value of above-ground part of the community reached to its highest point, 1398. 8 g m-2 in August, 1994; the under-ground part 770. 8 g m-2 in September. Biomass of the community fluctuated in accordance with the logistic curve: y=1634. 46/ (1+e2.67976-1.30369x10-2t) . The highest value of the community's fresh weights measured monthly was 4050 g m-2 (Aug. 1994) . Estimated by Peak Standing Crop in Sept. 1994, the annual NPP of the community was 2169. 6 g m-2 a-1. Through a growth analysis, the above ground part biomass of the community changes with four stages: slow increasing (Feb. -Apr. ); acceleration increasing (May-June); deceleration increasing (July-Sept. ); stagnation and descent (Oct. - Dec. ). Of all the factors that affect the biomass value, the rainfall was an important one. Their regression equation was y= - 74. 3779+0. 9480x, and the relation coefficient (r) was 0. 9783

Barnacle damage and its control in young mangrove plantations: A research review.

随着近年来红树林恢复性造林面积的扩大,海洋污损生物藤壶对红树林幼林的危害问题日益突出.文中综述了藤壶附着的生物化学、藤壶在红树林附着的生态学、藤壶对人工红树林幼林的危害和国内所采用的化学药物防治措施等方面的研究进展,以及今后的研究方向.藤壶在红树林的附着和分布模式受海水盐度、浸淹深度、林分郁闭度、水文条件等环境因素和生物因素的影响.而藤壶胶粘蛋白的氨基酸组成、一维结构,胶粘蛋白在水下的交联、组装和胶粘的过程与机制,以及藤壶危害红树幼苗的机制和危害权重尚需要深入探讨.研究红树植物对藤壶附着的响应和长期适应机制将为藤壶的防治提供更多的启示. 【英文摘要】 With the increasing area of restored mangrove vegetation, marine-fouling organisms, barnacle in particular, are suggested to be an important factor affecting the survival and growth of mangrove seedlings. This paper reviewed the biochemical and ecological studies on the settlement of barnacle, its damage on mangrove seedlings, and its chemical control. The settlement and distribution model of barnacle on mangroves is significantly affected by the environmental factors such as seawater salinity, tide inundat...国家自然科学基金项目(30270272);; 厦门市海洋与渔业局、翔安农林水利局资助项目(2005-2008)

Emission Mechanism of High Al-content AlGaN Multiple Quantum Wells

紫外LED的发光功率和效率还远不能令人们满意,波长短于300 nm的深紫外LED的发光效率普遍较低。厘清高Al组分Al Ga N多量子阱结构的发光机制将有利于探索改善深紫外LED的发光效率的新途径、新方法。为此,本文通过金属有机气相外延技术外延生长了表面平整、界面清晰可辨且陡峭的高Al组分AlGa N多量子阱结构材料,并对其进行变温光致发光谱测试,结合数值计算,深入探讨了Al Ga N量子阱的发光机制。研究表明,量子阱中具有很强的局域化效应,其发光和局域激子的跳跃息息相关,而发光的猝灭则与局域激子的解局域以及位错引起的非辐射复合有关。The quantum efficiency of deep UV light emitting diodes( LED) drops dramatically with the increasing of Al content. Understanding the emission mechanism of high Al-content Al Ga N multiple quantum wells( MQW) is the one of the most important objects for improving the quantum efficiency of deep UV LED. In this work,high Al-content Al Ga N MQW structure with atomically flat hetero-interfaces was grown and characterized by photoluminescence( PL) measurements at different temperatures. The results indicate that there is a strong exciton-localization effect in the MQW structure and the emission is closely related to the hopping of the excitons. Due to the exciton delocalization and nonradiative recombination at defects,the PL intensity is strongly quenched at high temperatures.“973”国家重点基础研究发展计划(2012CB619300);; “863”国家高技术研究发展计划(2014AA032608);; 国家自然科学基金(U1405253;61227009;11204254;11404271);; 福建省自然科学基金(2015J01028)资助项

Study on the characteristics of Syzygium cumini L. pigment

以海南蒲桃成熟果实为原料提取天然色素,并对其理化性质进行了分析研究。同时比较了D-072、D-401、D-301-G、D-101、D-110、DF01六种树脂对该色素的静态吸附情况及不同极性解吸剂对吸附色素的树脂洗脱的效果,从中选择吸附和解吸附效果最好的树脂以及适合的解吸剂。研究表明:该色素在酸性条件下对热、金属离子和常用食品添加剂均具有较好的稳定性,对光稳定性稍差;D-072大孔吸附树脂对海南蒲桃色素吸附效果最好,色素吸附率达90.7%;解吸剂用含0.2%三氟乙酸的50%酸化乙醇,色素可被充分洗脱下来。此研究结果为以海南蒲桃成熟果实为原料来生产食用色素提供了理论依据。The stability of pigment which was extracted from the fruit of Syzygium cumini was studied. In addition, absorbing and separating Syzygium cumini pingment with macroreticular resin was also studied. Static absorption capacity of six resins(D-072, D-401, D-301-G, D-101, D-110, DF01) for the pigment was compared. From these resins, the one with the best absorpting and desorpting effect was elected. The results showed that this kind of pigment has a better stability toward heat, metal ion and common food additives under acidic condition, and it is more tolerable of heat than light. The adsorption ability of D-072 resin was the best and the adsorptive rate of pigment reached 90.7%. When 50% ethanol contained 0.2% TFA was used as desorptive solvent, the pigment could be sufficiently desorpted and the effect of desorption would be better. It has a great prospect in the exploration and application in food industry to produce the food pigment from the fruit of Syzygium cumini.国家自然科学基金项目(30671646

Microorganism resource of mangrove ecosystems

随着工业的迅猛发展,工业废料源源不断地向海洋输出,污染日趋严重。人们在大力开发海洋微生物自净能力的同时,也对海岸线的绿色卫士———红树林给予了密切关注,积极展开红树林区微生物资源的开发利用。本文从红树林区微生物库的资源多样性、微生物在物质循环和能量流动中的作用、生理活性物质、代谢产物和污染治理等几个方面进行综述。 【英文摘要】 With the rapid development of industry,more and more industrial waste is constantly exported to the ocean which causes serious pollution problems.Researchers are paying more attention to the mangrove,the important guard of the coastline,and the exploitation of mangrove microorganism resource has been expanded in many aspects,as well as developing the self-clean ability of ocean microorganism.This review summarized the diversity of mangrove microorganism resource,the role of microorganism in material recycle...国家自然科学基金资助项目(30270272)

Contents and Structure Analysis of Tannins in Leaves of Three Cultivars of Camellia sinensis

测定了本山、黄旦和铁观音三个品种茶树成熟叶片的总酚及可溶缩合单宁含量,并通过基质辅助激光解吸附飞行时间质谱(MAldI-TOfMS)研究了茶叶缩合单宁的基本结构。结果显示,三种茶叶均具有较高的总酚含量,大约为200Mg/g;三种茶叶的缩合单宁是以(表)儿茶素(EC/C)和(表)棓儿茶素(EgC/gC)为基本结构单元的均聚物和杂聚物,且大部分聚合物的结构单元之间存在A型和b型两种连接方式,其中本山和黄旦缩合单宁的最高聚合度要大于铁观音。The contents of total polyphenols and extractable condensed tannins in leaves of three types of Camellia sinensis (Benshan,Huangdan and Tieguanyin) were determined.In addition,the structures of condensed tannins were characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-Tof MS).Three types of tea leaves have total phenolic contents as high as 200 mg/g.The majority of condensed tannins in the three types of C.sinensis are identified as the mixtures of procyanidins and prodelphinidins with a medium level of galloylation through the linkage of A-type and B-type interflavan bonds.Meanwhile the degree of polymerizations is higher in Benshan and Huangdan than in Tieguanyin.国家自然科学基金项目(40376026;30671646

砌体防倒塌钢桁架加固方法研究

上世纪后30年,我国建造了大量砌体结构,而现用中小学校舍占有其中相当的比例。对于砌体结构的改造与加固在现时代仍具有十分重要的意义。本文提出了一种利用钢桁架对砌体结构进行防倒塌加固的方法,包括计算假定以及设计理论,并且给出了该加固方法的设计流程。分析表明,防倒塌钢桁架加固方法,在提高结构系统的安全储备方面可以发挥重要作用,是一种经济可行的对砌体结构加固的新方法