滨海社区空间演变分形研究——以厦门市高浦社区为例

滨海城市社区的空间形态及其海岸线表现出一定程度的复杂性,发展量化描述方法对于其可发展研究有重要的理论与应用价值。本研究基于分形理论,以滨海城市厦门的高浦社区为研究对象,利用计盒法对该滨海社区空间形态和边界进行复杂性分析和分形维计算,研究社区空间形态复杂性演变规律。结果表明:作为典型海湾渔村的高浦社区空间形态具有分数维,呈现分形结构特性。自1989年至今,该社区空间形态的分形维数呈现增长态势;社区边界的分形维数呈现下降态势。社区空间形态的分形维数与社区建筑占地面积、建筑总面积、建筑密度、容积率都表现出相关性。这表明滨海社区在快速城市化进程中,社区规模急剧扩张可能会导致空间形态和边界复杂性的显著变化。住建部科学技术计划资助项目(2017-R2-015

Super-resolution Image Reconstruction Algorithm Based on Sub-pixel Shift

针对多帧图像超分辨率重建问题,利用一阶泰勒展式,在亚像素级上对图像退化过程进行建模,并建立极小化能量函数,选择grAPH-CuT算法进行能量极小化求解.为了验证本文算法的有效性,采用模拟图像退化过程和直接用相机拍摄两种方式获得低分辨率图像序列.从4x4倍重建结果的比较来看,本文算法不仅对模拟退化过程产生的低分辨率图像序列有效,而且在提高真实低分辨率图像的分辨能力方面也有很好的效果.此外,实验结果表明本文算法对噪声有较好的抗干扰能力.This paper studies the problem of multi-frame image super-resolution reconstruction.The process of image degradation is modeled by using the first-order Taylor expansion based on sub-pixel.Then the energy minimization function is established and the graph-cut algorithm is chosen to solve the energy minimization.In order to confirm this algorithm, we obtain the low resolution images by two ways: simulating image degradation and taking photos.By comparing the 4 × 4 times reconstruction results, it is shown that this algorithm is valid not only for simulation of low resolution images but also for real images.Besides, experimental results show that this algorithm possesses good anti-interference ability of noise.国家自然科学基金(61373077); 国防基础科研计划(B0110155); 国防科技重点实验室基金(9140C30211ZS8); 高等学校博士学科点专项科研基金(20110121110020); 福建省自然科学基金(2011J01365); 福建省重点项目(2014H0034); 航空科学基金(20125168001); 黄慧贞集美大学学科建设基金(ZC2014010)资助~

New method of variable excitation MFL testing under the condition of small magnetizing apparatus

为解决常规储罐和管道的漏磁检测(Mfl)方法中磁化器体积大、耗能多的缺点,提出了一种小型磁化器条件下的变励磁Mfl检测新方法。首先,分析了小磁化器条件下被测钢板磁化状态随外部励磁强度的变化特性,推导了偏置磁化条件下励磁通变化量与漏磁场变化率的关系模型;其次,根据所建立的关系模型,设计了一种新型变励磁Mfl检测探头,并给出变励磁Mfl法的系统实现方案;再次,结合实现方案,搭建了变励磁Mfl相应的实验平台;最后,在该平台上,开展了一系列的物理实验并对实验结果进行了深入讨论。实验结果表明,所提变励磁Mfl法无需对被测钢板进行局部饱和磁化,适合小型磁化器条件并具有较高的灵敏度。变励磁Mfl法为漏磁检测领域提供了一种新的检测思路。In the conventional method of magnetic flux leakage( MFL) testing,the magnetizer is in big volume and with more energy consumption.To solve the problem,a new method of variable excitation MFL testing under the condition of small magnetizer is proposed.First of all,the state of magnetized steel along with the change of the external excitation's intensity under the condition of small magnetizer is analyzed.Secondly,according to the established model,a new type of testing probe for the variable excitation of MFL is designed and a new implementation scheme is proposed.Furthermore,combining with the implementation scheme,an appropriate testing platform of the variable excitation MFL is set.Finally,a series of physical experiments on the platform are carried out and the results of the experiment were discussed.The experimental results show that the proposed method don't need to make local saturation magnetization of tested steel plate,which is suitable for the condition of small magnetizer with higher sensitivity.The new method provides a new testing idea for MFL testing field.国家自然科学基金(51177141); 中央高校基本科研业务项目(2010121041); 航空基金(2012ZD68003)资助项

结核分枝杆菌相关γ-干扰素体外释放试验在结核病诊断中的应用价值

目的探讨结核分枝杆菌相关γ-干扰素体外释放试验(Tb-IgrA)在结核病诊断中的应用价值。方法用国产Tb-IgrA试剂定量检测268例结核病患者和104例体检健康者外周血结核特异性γ-干扰素的含量,同时与澳大利亚QfT-gIT试剂和结核菌素纯化蛋白质衍生物(PPd)皮试进行平行比较分析。结果国产Tb-IgrA试剂、QfT-gIT试剂和PPd皮试3种方法的敏感性分别为90.7%、88.1%和75.4%,特异性分别为76.9%、80.8%和54.8%,阳性预测值分别为91.0%、92.2%和81.1%,阴性预测值分别为76.2%、72.4%和46.3%,准确性分别为86.8%、86.0%和69.6%。三种方法对肺结核与肺外结核的检测效果无显著差异。结论 Tb-IgrA法对诊断结核病有较高的敏感性和准确性,在结核病防控中有较好的应用价值。国家十一五“艾滋病和病毒性肝炎等重大传染病防治”科技重大专项资助项目(2008ZX10003-004

Variations of fish species diversity,faunal assemblage,and abundances in Daya Bay in 1980-2007.

根据2004—2005年大亚湾海域底拖网鱼类调查数据,并结合1980—2007年的历史资料,分析了该海域鱼类的种类组成、区系特征、多样性、优势种和数量变化趋势.结果表明:2004—2005年,大亚湾海域共记录鱼类107种,分属13目50科,以中下层鱼类的种类最多,为48种,其次是中上层和底层种类,分别为37种和21种.大亚湾鱼类区系具热带和亚热带特性,以暖水性种类占绝对优势,为97种,暖温性种类为10种.多样性指数以夏季最高(3.82),其次是冬季(3.37)和秋季(3.00),春季最低(2.40).PIElOu均匀度指数的季节变化情况与多样性指数相似.1980—2007年大亚湾海域鱼类群落特征发生了明显的变化:鱼类种类数减少,优势种更替明显.鱼类种类数由1980年的157种减少至1990年的110种,2004—2005年继续减少至107种;鱼类优势种由1980年以带鱼和银鲳等优质鱼为主,更替为以小型和低值的小沙丁鱼、小公鱼和二长棘鲷幼鱼为主.用包含年际变化趋势和季节性周期变化的回归模型模拟1980—2007大亚湾鱼类资源密度的变化,鱼类资源密度在1980—1999年和1990—2007年两个时期均呈下降趋势,但1990—2007年间下降幅度比1980—1999年间大;1980—1999年鱼类资源密度的季节波动幅度较平缓(振幅为0.099),而1990—2007年的季节波动较大(振幅为0.420),说明1990—2007年阶段大亚湾鱼类数量的季节变化更为显著.Based on the 2004-2005 otter trawl survey data and the 1980-2007 relevant historical records,this paper analyzed the variations of fish species composition,faunal assemblage,diversity indices,dominant species,and abundance in Daya Bay.In the 2004-2005 trawl survey,a total of 107 fish species were recorded,belonging to 50 families and 13 orders,among which,meso-demersal fish were predominant,with 48 species recorded,and followed by pelagic and demersal fishes,with 37 and 21 species,respectively.The fishes in the Bay belonged to tropical and subtropical fauna,with the dominance of warm water fishes(97 species) and warm-temperate water fishes(10 species).The diversity index was the highest in summer(3.82),followed by in winter(3.37) and autumn(3.00),and the lowest in spring(2.40).The seasonal variation of Pielou evenness index mimicked that of diversity index.In 1980-2007,the characteristics of fish community in the Bay changed obviously.The species number reduced from 157 species in the 1980s to 110 species in the 1990s and to 107 species in 2004-2005,and the dominant species shifted from the high-value fishes such as hairtail and pomfret in the 1980s to low-value fishes such as sardine fish,anchovy,and juvenile porgy.A non-linear regression model composed of inter-annual trend and seasonal cycle was used to simulate the changes of fish stock density in 1980-1999 and 1990-2007,and the results indicated that in the two periods,the fish stock density in the Bay all showed a decreasing trend,but the decrement was larger in 1990-2007 than in 1980-1999.The seasonal variation of the stock density in 1980-1999 was relatively small,with an amplitude being 0.099,while that in 1990-2007 was relatively larger,with the amplitude being 0.420,illustrating that the fish abundance in the Bay had a larger seasonal fluctuation in 1990-2007.中央级公益性科研院所基本科研业务专项(2010YD10、2009TS08)资

The Effects of Neonatal Bovine Brain Bioactive Peptide NBBP-1 on Proliferation and Associated Gene Expression of Human Neuroblastoma SK-N-SH Cells

目的:应用新生牛牛脑活性肽nbbP-1处理人神经母细胞瘤Sk-n-SH细胞,观察nbbP-1对人神经母细胞瘤Sk-n-SH细胞增殖和相关基因表达的影响。方法:通过细胞计数、流式细胞仪、光学显微镜、免疫细胞化学方法检测细胞的变化。结果:经60μg/MlnbbP-1处理后,Sk-n-SH细胞生长抑制率高达90.09%,细胞周期被阻滞在g0/g1,细胞核裂解成多个,免疫细胞化学染色结果显示,经处理后bCl-2抗凋亡基因蛋白表达减弱,而P53、fAS、bAX等促凋亡基因蛋白表达增强。结论:新生牛牛脑活性肽nbbP-1对人神经母细胞瘤Sk-n-SH细胞凋亡具有显著的诱导作用,其诱导癌细胞凋亡的机理与其调节和干预癌基因bCl-2和P53、fAS、bAX等抑癌基因的表达有关。Objective:To study the effects of neonatal bovine bioactive brain peptides in peakⅠ(NBBP-1),with which we treated SK-N-SH cells,on the proliferation and gene expression of human neuroblastoma SK-N-SH cells.Methods:The changes of SK-N-SH cells induced by NBBP-1 were detected by means of cell count,flow cytometry analysis,light microscope and immunocytochemistry.Results:Treated with 60 μg/mL NBBP-1,the proliferation of SK-N-SH cells was inhibited effectively,and the rate was up to 90.09 %.Cell cycle was arrested in G1/S phase.Nucleus broke into several parts.The results of immunocytochemistry showed that expression of anti-apoptotic gene bcl-2 was down-regulated and expression of apoptotic genes p53,fas,bax were up-regulated.Conclusions:This study suggested that NBBP-1 could regulate the proliferation of human neuroblastoma SK-N-SH cells effectively,and the effect was related with the changes of oncogene and tumor-suppressor gene.福建省科技计划重点项目(2003N0052)资

Effect of Flue-gas Cleaning Devices on Mercury Emission From Coal-fired Boiler

为研究燃煤锅炉烟气净化设施对汞排放特性的影响,采用Ontario-Hydro方法,对设有催化脱硝、静电除尘、海水脱硫的300MW燃煤锅炉排放烟气中汞的含量与形态进行分析,同时测定锅炉的煤、底渣、飞灰等固体样品以及脱硫塔前后、曝气之后海水样品中的汞含量。实验结果为:烟气中的气态汞占总汞的79.1%以上,脱硝催化剂对汞的价态具有强烈的转化作用,烟气中83.4%的气态Hg0被氧化成气态Hg2+;静电除尘对颗粒态汞的去除率几乎达到100%;在脱硫塔中,海水对烟气中汞的洗脱率高达73.6%,曝气后排放前的海水中含汞量是新鲜海水的5.5倍。研究表明锅炉烟气净化设施对汞的排放特性有着重要的影响。In order to study the effect of flue-gas cleaning devices on mercury emission from coal-fired boiler, Ontario-Hydro method had been applied to determine the mercury concentration and speciation in the flue-gas emitted from a 300MW coal-fired boiler, which was equipped with various pollution control devices, including selective catalyst reduction (SCR) De-NOx system, electrostatic precipitator (ESP), and flue-gas seawater De-SO2 system (FGD). Mercury concentration in raw coal, bottom ash and fly ash of the boiler, seawater at the inlet and outlet of SO2 absorption reactor and the drainage of aeration sink, were also analyzed. The results indicate that the percentage of gaseous mercury in total mercury discharged is more than 79.1%. De-NOx catalyst strongly affects the mercury speciation transformation, showing a conversion rate of 83.4% for Hg0 to Hg2+. The removal efficiency of particulate mercury by ESP is close to 100%. With seawater FGD, the removal efficiency of mercury is as high as 73.6%. The mercury concentration in the seawater of drainage from aeration sink is 5.5 times higher than that in fresh seawater. The study shows that the flue-gas cleaning devices in coal-fired power plant play an important role on mercury emission characterization

“建筑适应性”主题沙龙

"地域建筑"是当下建筑学界共同尊重的准则,但这一术语的过度使用,也使得其内涵在当代建筑创作中逐渐模糊。本期沙龙主题"建筑适应性",是对"地域建造"这一命题的具体化。"适度"的"适应"是当下应当倡导的地域建筑设计创作原则。"建筑适应性"中的"适应",强调对历史文脉与所处环境的积极回应,研究建筑与环境之间的复杂应答关联;除此,"建筑适应性"还强调对经济、技术、材料的"适度

改良分子信标-双重实时荧光PCR快速检测SARS病毒

目的建立改良分子信标-双重实时荧光PCR检测SARS病毒的方法,用于SARS的早期诊断和动物溯源。方法利用改良分子信标技术、装甲RNA和双片段双色荧光技术,根据GenBank公布的SARS病毒聚合酶基因1b的阅读开放框架结构的保守序列,自行设计一对引物和探针,以部分临床标本的酶联吸附实验结果和传统细胞培养方法作为对照,建立分子信标检测SARS病毒的方法。对368份临床标本(咽漱液、血液、粪便、尿液)、52份细胞培养液和50份动物标本进行荧光PCR扩增。结果分子信标检测SARS病毒的方法灵敏度为10～100个拷贝ml,与流感病毒等呼吸道病毒无交叉反应。分子信标检测368份临床标本,20份阳性。其中确诊病例阳性率为21.27%(1047),确诊病例的咽漱液阳性率为43.48%,还分别从粪便和血清中检测到SARS病毒。52份细胞培养液,29份阳性,阳性率为55.77%。50份动物标本,23份阳性,阳性率为46%。结论改良分子信标-双重实时荧光PCR检测SARS病毒方法灵敏度高、特异性强,可用于SARS的临床早期诊断和动物溯源

Detection of Visual Center of Gravity from Chinese Characters Based on Statistics

该文提出了一种汉字字形视觉重心的计算方法。首先收集常用汉字图像样本,通过图像预处理,提取出样本汉字的连通区域视觉平衡中心;然后招集被试对样本汉字进行视觉重心标注;再利用统计建模的方法,构建出连通区域视觉平衡中心和汉字整体视觉重心之间的关系模型。与相关方法比较,文中方法考虑了汉字视觉重心依赖于人的主观体验这一因素。该方法能广泛应用于汉字特征提取、汉字结构设计与优化等应用领域。A method of finding the visual center of gravity from a Chinese character is presented in this paper.Firstly we collect some Chinese character samples,and further extract visual balance center of each Chinese character.Then we mark visual center of gravity of the sample characters;ultimately construct a relationship model between the connected region 's visual balance center and visual center of gravity of Chinese characters based on statistics.The proposed method has many potential applications,such as feature extraction,designation and optimization of Chinese characters.国家自然科学基金(60903129); 中国计算机学会中文信息技术开放课题基金(CCF2011-01-03