Improvement and Implementation of KeeLoq Algorithm

随着电子门控设备的普及,通过手机实现门锁智能化控制开始逐渐兴起,但是提升其通信安全性仍是值得研究的问题。本文通过详析kEElOQ加解密算法基本原理,归纳当前的主要攻击方法,指出其安全性上的不足。借鉴3dES算法,提出了三重kEElOQ算法,加大破解难度,进一步改善其安全性能。并结合蓝牙通信及AndrOId应用程序设计方法,将该算法成功地应用于智能门控系统中,将多种门锁钥匙软件化,实现低成本、高安全性、人性化及绿色环保智能门控系统的设计。As the popularity of electronic-controlled locks,the intelligent lock contorlled by cellphones begins to spring.However,it deserves to further study and improve its communication security.According to the detailed rationale of KeeLoq codec algorithm and the induction of previous attack researches,the security lack of KeeLoq codec algorithm was indicated.Taking example by 3DES algorithm,the triple KeeLoq codec algorithm was proposed to increase the crack difficulties,which its security was better improved.Associated with the bluetooth communication technology and the design method of Android applications,the triple KeeLoq codec algorithm was implemented in the design of intelligent locks.Due to multifarious software-based keys,the intelligent lock owns overwhelmed advantages of lowcost,high security,humanity and green environmental protection.厦门科技项目(3502Z20133019;3502Z20143020); 福建省教育厅科技项目(JA12200;JA11157); 集美大学潘金龙学科建设基金(C512038

A Tentative Study on the Strategy of Protecting the Cultural Heritage in Urban Village --A Case Study of Nijin Community in Wutong Village, Xiamen City

在快速的城市化进程中,城中村问题频现,许多城中村文化处于没落的边缘。在此背景下,本文选择厦门岛的一个城中村——五通村泥金社作为研究对象。通过实地调研,发掘其中的文化遗产价值和构成体系,探讨文化遗产保护的原则和制定具体策略,为城中村改造、协调城市发展与城中村文化延续起到一定的积极作用。Abstract：in fhe process of rapid urbanization, the problem of many villagesin the city appeared frequently, and the village culture in the city was on the edge of decline.In this context, this paper chooses Xiamen City, a village in the city Nijin Community,Wutong village, as the research object.Through the field research, the paper explores the value and composition of cultural heritage, discusses the principles of cultural heritage protection and the development of specific strategies, and plays a positive role in the village in the city transformation, coordination of urban development and the continuation of urban culture.福建省教育厅A类科技项目JA14018

Degradation of HPAM-containing wastewater with integrated process of UASB and immobilized microorganism reactor

随着聚合物驱油技术在油田的广泛推广,部分水解聚丙烯酰胺(HPAM)在为油田提高采收率的同时,对当地环境也产生了相当大的危害。本文在对含聚污水水质分析和可生化性分析的基础上对污水进行可生化性调整,运用“气浮-uASb-水解酸化-微生物固定化反应器“组合工艺对含聚污水进行了生化处理模拟实验。模拟实验分为静态模拟和动态模拟两部分。静态模拟实验中,降解6天后,聚丙烯酰胺降解率达到89.7%。动态模拟试验中,组合工艺处理2天以后,HPAM降解率为88.65%,原油总去除率为99.40%,出水COd总去除率为93.40%。利用扫描电镜(SEM)和红外光谱分析聚丙烯酰胺降解产物,显示HPAM由大分子物质断裂成小分子物质,HPAM的酰胺基转化为羧基。Polymer flooding technique has become an important method of enhanced oil recovery.But the application of partially hydrolyzed polyacrylamide(HPAM) in oilfield meets many environmental problems.Based on water analysis and biodegradability analysis of HPAM-containing wastewater,improved biodegradability of wastewater was achieved.Laboratory simulation treatment of wastewater was performed by the "flotation-up-flow anaerobic sludge bed(UASB)-hydrolysis acidificationimmobilized microorganism reactor" integrated process.There were two parts in simulation experiment,one was static,and the other was dynamic.After 2 d static biochemical treatment,the degradation ratio of HPAM in wastewater was up to 89.7%.And in dynamic simulation experiment,after 2 d treatment,the degradation ratio of HPAM was up to 88.65%,that of oil was 99.40%,that of COD was 93.40%.HPAM degradation products were analyzed by scanning electron microscopy(SEM) and infrared spectroscopy.The results showed that HPAM was transformed from bigger molecules into smaller molecules and acylamino group in HPAM was transformed into carboxyl group.国家863计划项目(2008AA06Z304

Effect of Refractive Index of Substrate on Fabrication and Optical Properties of Hybrid Au-Ag Triangular Nanoparticle Arrays

以石英和不同型号的玻片为基底,系统研究了基底折射率对周期性金银复合纳米阵列的制备及其光学性能的影响。采用离散偶极子近似(ddA)数值方法研究了复合阵列的局部表面等离子共振(lSPr)光谱特性,计算结果表明,当基底折射率为1.43和1.68时,纳米阵列的折射率灵敏度(rIS)和品质因子(fOM)比较优异。利用纳米球刻蚀法(nSl)制备了二维周期性复合纳米点阵结构,实验结果表明,当基底折射率为1.43和1.68时,基底与贵金属纳米颗粒有较好的粘合度,纳米阵列结构形貌比较规则清晰。Based on the substrate of silica and different types of slides, the effect of refractive index of substrate on fabrication and optical properties of hybrid Au- Ag triangular periodic nanoparticle arrays is systematically investigated.The optical spectrum of localized surface plasmon resonance(LSPR) simulated by discrete dipole approximation(DDA) numerical method shows that the nanoparticle arrays can obtain better refractive index sensitivity(RIS) and figure of merit(FOM), when refractive index of substrate is 1.43 and 1.68, respectively.The nanosphere lithography(NSL) is used to fabricate the periodic nanostructure arrays.The experimental results demonstrate that when refractive index of substrate is 1.43 and 1.68, nanoparticles and substrate have better adhesive ability.Meanwhile, the nanoparticles both form a large-scale monolayer array with the hexagonally close-packed structure.国家自然科学基金(11074207); 厦门科技项目(3502Z20143020;2012S0484); 福建省教育厅科技项目(JA11157;12200); 集美大学潘金龙基金(C512038

A comparison of fine-scale species richness and climatic condition in alpine tundra communities between Mt. Changbai, China, and Mt. Tateyama, Japan

We compared the species richness of vascular plants in the alpine tundra community of Mt. Changbai in northeastern China and Mt. Tateyama in central Japan. The fine-scale species-area relationships in an area ranging from 0.0625 m2 to 1.25 m2 were investigated, and the number of species per given space and the increas-ing rate of species richness with area were compared between the two mountains. Dominant species were two deciduous shrubs（Vaccinium uliginosum var. alpinum and Rhododendron redowskianum）on Mt. Changbai and two evergreen shrubs（Diapensia lapponica var. obovata and Arcterica nana）on Mt. Tateyama. The coverage and frequencies were greater on Mt. Changbai than on Mt. Tateyama. The number of species per m2 was greater and the increasing rate of species richness was slightly higher on Mt. Tateyama than on Mt. Changbai. We discussed the reasons from the view of dominant deciduous shrubs on Mt. Changbai

亚热带红壤丘陵区湿地松人工林生态系统碳素贮量与分布研究

利用标准样方法对19a生湿地松人工林生物量、碳素含量、贮量及其空间分布进行测定。结果表明,湿地松各器官的碳素含量在50.92%~54.38%波动,排列顺序为树叶>树枝>树根>树干>树皮,且各器官的碳素含量随树龄增长而提高。林冠上层与下层叶的碳素含量比中层叶的碳素含量低,但差别不大;下层枝条碳素含量明显比上、中层枝条高。灌木层、草本层、凋落物层的碳素含量依次为45.16%、42.28%、40.88%;土壤层碳素含量平均为0.43%,且随土壤深度的增加而明显递减。湿地松各器官碳贮量与其生物量成正比例关系,排列顺序为树干>树根>树皮>树枝>树叶。随着树高的增大,树干碳贮量在乔木层中所占比例逐渐下降,树皮碳贮量所占比例处于一个缓慢上升的状态,枝叶碳贮量所占比例在10~12m段出现最大值。湿地松林生态系统碳贮量(C)为121.94×103kg/hm2,其中乔木层为86.78×103kg/hm2,占整个生态系统总贮量的70.67%,下木层为0.6×103kg/hm2,占0.49%,凋落物层为8.86×103kg/hm2,占7.27%,林地土壤(0~60 cm)为26.3×103kg/hm2,占21.57%。根据以上数据,得出湿地松林年净生产力约为7.61×103kg/hm2.a,有机碳年净固定量(C)为4.54×103kg/hm2.a

生态恢复的卫星遥感监测——江西省兴国县为例(英文)

利用遥感手段研究了江西省兴国县造林及生态保护所带来的植被变化。使用数据为1985和2000年LandsatTM的2个时期图像以及土地利用的GIS数据。利用图像差值法计算近红外光(波段4)的辉度变化,以此分析植被动态。结果显示,兴国县植被在面积上变化不大,略有增加,但是植被状况有所改善,和当地多年造林的成效是一致的。研究结果还表明,利用卫星图像定量评价植被变化是一个有效而简洁的方法,包括面积、生产力、分布状况等

三种常见针叶树种的细根形态比较

细根

电极分离的980nm锥形激光器的研制

对脊形波导区和锥形区电极分离的980nm锥形激光器(简称电极分离的980nm锥形激光器)改变脊形波导区所加电流,测试激光器的P-I特性和光束质量因子,与脊形波导区和锥形区共用电极的980nm锥形激光器(简称电极共用的980nm锥形激光器)的测量参数进行对比.发现电极分离的980nm锥形激光器的P-I特性曲线比较光滑,没有明显的扭折.随着脊形波导区的电流逐渐超过150mA以后,器件的最大输出功率逐渐达到4.28W,与电极共用的980nm锥形激光器相同并趋于饱和,光束质量因子从3.79降到2.45(输出功率为1W)