Reliabilities of High Voltage Feed Through Ceramic Capacitors for EMI Applications

本论文实验采用以环氧树脂混合活性硅微粉和活性增韧剂为主剂，采用多种酸酐混合为固化剂，同时添加促进剂降低固化温度的环氧树脂灌封陶瓷电容器，制成高压瓷介电容滤波器（简称滤波器）。滤波器的制作过程经陶瓷烧结、印银、印锡、焊接、清洗等工序制成半成品，然后装配、灌封树脂、固化树脂和性能检测等。本论文探讨灌封环氧树脂中不同增韧剂及其配比、不同酸酐固化剂配比、不同无机填料对滤波器可靠性的影响，同时研究工艺参数对滤波器可靠性的影响，在现有实验条件下优化滤波器的制作工艺。实验表明灌封环氧树脂的力学性能和电学性能对滤波器可靠性的影响较大，增加灌封环氧树脂的柔韧性有助于提高滤波器的冷热冲击性能，添加活性增韧剂能增加...Reliabilities of high voltage feed through ceramic capacitors，.e., filters, are investigated in this paper，which are applied for electromagnetic interface, EMI, of microwave equipments at high-voltage, such as magnetic tube in microwave oven and engineering vehicle working at the frequency of 2450 MHz. The filters are produced by the procedures of ceramic sintering, silver paste printing, tin past...学位：工学硕士院系专业：化学化工学院材料科学与工程系_材料学学号：20033602

The Internationalization Of Indian SMEs In B-to-B Markets

Purpose – The study aims to examine the effect of market orientation on the international performance of Indian SMEs in the business-to-business market; assess the potential moderating effect of environmental uncertainty, along with market orientation, on SMEs’ performance; and discuss implications to guide SME owners/managers in their efforts to successfully expand internationally in turbulent markets. Design/methodology/approach – Surveys were sent to a random cross-sectional industry sample of SMEs located in India. The data consisted of 150 responses. Findings – Market orientation and international orientation are positively related to export performance and the relationship between the market orientation and international performance of Indian SMEs is moderated by market turbulence. Research limitations/implications – The data were collected at a single point in time, and therefore do not allow the determination of cause and effect or the impact of changes over time. Data were collected with a reliance on self-reports for all of the research variables. Practical implications – The positive relationship between market orientation, international orientation, and the degree of internationalization of the firm would suggest that the upper management of Indian SMEs should place a priority on promoting behaviors consistent with a positive international orientation, especially in turbulent markets. Originality/value – Studies focused on market orientation have been done primarily in the context of advanced economies. The significant economic contribution of SMEs is well understood, but their business practices in emerging economies have not been studied extensively. This study extends the literature concerning factors that impact business success in an important emerging market such as India

A Perspective Invariant Image Matching Algorithm

针对ASIfT(AffInE SCAlE InVArIAnT fEATurE TrAnSfOrM)算法存在的仿射采样策略、采样点离散设置等问题,提出了一种基于粒子群优化的图像透视不变特征PSIfT(PErSPECTIVE SCAlE InVArIAnT fEATurE TrAnSfOrM)算法.该算法通过虚拟相机的透视采样来模拟景物在多视角图像中的变形.在此基础上,将图像匹配问题转换为透视变换的优化问题,并以粒子群算法为工具,研究了虚拟相机旋转参数搜索空间、适应值函数的合理设定.针对三组不同类型低空遥感图像的实验结果表明,该算法比ASIfT、SIfT(SCAlE InVArIAnT fEATurE TrAnSfOrM)、HArrIS AffInE和MSEr(MAXIMAlly STAblE EXTrEMAl rEgIOnS)等算法获得更多的特征匹配对,有效地提高了算法对视角变化的鲁棒性.To solve the problem of affine transform and discrete sampling in ASIFT(Affine scale invariant feature transform),the PSIFT(Perspective scale invariant feature transform),which is based on particle swarm optimization,is proposed in this paper.The proposed algorithm uses a virtual camera and homographic transform to simulate perspective distortion among multi-view images.Therefore,particle swarm optimization is employed to determine the appropriate homography,which is decomposed into three rotation matrices.Experimental results obtained on three categories of low-altitude remote sensing images show that the proposed method outperforms significantly the state-of-the-art ASIFT,SIFT,Harris-affine and MSER,especially when images suffer severe perspective distortion.国家自然科学基金(61103052;61202143); 国家教育部博士点基金(20090121110032); 福建省产学重大科技项目(2011H6020); 福建省自然科学基金项目(2011J01013;2013J01245;2013J05100); 深圳市科技计划项目(JC200903180630A;ZYB200907110169A); 厦门市科技计划项目(3502Z20123022;3502Z20110010); 福建省教育厅基金项目(JK2012025)资助~

A Survey on Pedestrian Detection

行人检测是计算机视觉中的研究热点和难点,本文对2005-2011这段时间内的行人检测技术中最核心的两个问题—特征提取、分类器与定位—的研究现状进行综述.文章中首先将这些问题的处理方法分为不同的类别,将行人特征分为底层特征、基于学习的特征和混合特征,分类与定位方法分为滑动窗口法和超越滑动窗口法,并从纵横两个方向对这些方法的优缺点进行分析和比较,然后总结了构建行人检测器在实现细节上的一些经验,最后对行人检测技术的未来进行展望.Pedestrian detection is an active area of research with challenge in computer vision.This study conducts a detailed survey on state-of-the-art pedestrian detection methods from 2005 to 2011,focusing on the two most important problems:feature extraction,the classification and localization.We divided these methods into different categories;pedestrian features are divided into three subcategories:low-level feature,learning-based feature and hybrid feature.On the other hand,classification and localization is also divided into two sub-categories:sliding window and beyond sliding window.According to the taxonomy,the pros and cons of different approaches are discussed.Finally,some experiences of how to construct a robust pedestrian detector are presented and future research trends are proposed.国家自然科学基金(No.60873179);高等学校博士学科点专项科研基金(No.20090121110032);深圳市科技计划-基础研究(No.JC200903180630A);深圳市科技研发基金-深港创新圈计划(No.ZYB200907110169A);福建省教育厅基金(No.JA10196

Investigation on the iodine status among the population in rural and urban areas of Xiamen in 2013

目的了解碘盐新标准实施后农村和城市人群的碘营养现况,为有效落实科学补碘防控策略提供依据。方法在农村和城市调查点各抽取1个镇的1个村,在每个村采集自来水厂出厂水和末梢水各2份;抽取30户以上居民,采集各户家庭食用盐,用3日称量法测算各户居民人均食盐摄入量;抽取18-45岁成人50名以上,采集尿样。在抽中的镇随机选择8-10岁儿童(男女各半)、孕妇和哺乳期妇女各50名以上,采集尿样。测定盐碘、尿碘和水碘含量。结果农村和城市自来水末梢水水碘含量均值分别为4.5μg/L和6.0μg/L;居民人均每日食用盐摄入量中位数分别为7.0和5.6g;8~10岁儿童尿碘中位数分别为152.0和181.2μg/L;哺乳妇尿碘中位数分别为108.3和107.7μg/L;18-45岁成人尿碘中位数分别为121.1和147.4μg/L;孕妇尿碘中位数分别为116.0和112.2μg/L,尿碘含量低于150μg/L的比例分别达67.9%和64%;除农村人均每日食用盐摄入量高于城市,农村18-45岁成人尿碘水平低于城市外,其他指标农村和城市间差异无显著性。结论厦门市仍是缺碘地区,在现有碘盐标准下,8-10岁儿童、18-45岁成人、哺乳期妇女的碘营养处于适宜水平,但孕妇的碘营养不足,要开展针对孕期人群的碘营养监测和指导,杜绝碘缺乏所造成的危害。Objective To gain knowledge of the iodine status among the population in rural and urban areas after the implement of new standard for edible salt and to provide scientific evidence for the initiative of the iodine supplement strategy. Method 1 village / community was selected randomly from rural and urban area as research site respectively. 2 samples of treated water and tap water were collected respectively in both sites, 30 + houses were enrolled randomly and edible salt samples were collected. 3days weighed record was employed to estimate average salt daily intake. Urine sample was collected from 50 + adults aged from 18 to 45. Identical sample was also collected from 50 + children aged from 8 to 10( same amount of subjects in both genders),pregnant women, and lactating women respectively. Iodine level of water, salt, and urine was determined by laboratory assay.Results The iodine concentration of tap water in rural and urban areas was 4. 5 μg / L and 6. 0 μg / L,respectively. The median of average iodine intake in rural and urban areas was 7. 0 g and 5. 6 g, respectively. The median in urine iodine was 152. 0 μg / L and 181. 2 μg / L,respectively. This measurement in lactating women was 108. 3 μg / L and 107. 7 μg / L,respectively. And it was121. 1 μg / L and 147. 4 μg / L in adults aged 18 to 45, respectively. As for the pregnant women, the iodine level reached 116. 0μg /L and 112. 2 μg /L,respectively. The proportion of subjects has urine iodine level less than 150 μg /L reached 67. 9 % and 64 %, respectively. The average salt intake in rural area was higher than urban significantly, and the urine iodine level in adults aged 18 to 45 from rural area was significantly lower than urban. No significance was found in other comparison. Conclusion Through our investigation,Xiamen is still an iodine deficiency area. Under the implement of new edible salt standard, the iodine status in children aged 8 to 10, adults aged 18 to 45 and lactating women was adequate, however, we found that pregnant women enrolled in our study have iodine deficiency in some degrees. Therefore the iodine surveillance and dietary guidance should be performed among pregnant women to eliminate the harm caused by iodine deficiency

ST段抬高型急性心肌梗死院前溶栓治疗中国专家共识

急性心肌梗死仍然严重威胁我国人民健康,在我国广大城乡地区,形势更为严峻[1,2]。及时救治急性心肌梗死患者,降低死亡率和保护心脏功能刻不容缓。鉴于我国的实际情况,院前溶栓治疗在大城市以外的城乡地区具有重要意义。为此,中国医师协会胸痛专业委员会及中国医学救援协会心血管急救分会专门组织有关专家制订了本共识,旨在帮助院前医疗急救人员对急性心肌梗死患者选择最佳

Damage to mangroves from extreme cold in early 2008 in southern China

通讯作者Author for correspondence (E-mail: [email protected])2008年初,我国南方19个省经历了50年一遇的持续低温雨雪冰冻天气。极端气候对华南沿海各省的红树林区造成不同程度的危害。2008年3月,在我国南方各省红树林区的10个代表性地点,对这次寒害造成的红树植物伤害程度进行了系统的调查。结果表明:冬季低温对红树林的影响极为显著,特别是在低纬度的海南、广西和广东湛江,由于极端低温正值夜间退潮,对红树林的影响更为显著;在纬度较高的福建,本地红树种类秋茄(Kandelia obovata)、桐花树(Aegiceras corniculatum)和白骨壤(Avicennia marina)及引种的木榄(Bruguiera gymnorrhiza)等,由于长期适应于冬季较低的气温或在种植前经过抗寒锻炼,具有较强的抗寒能力。各地主要红树植物中,广布种秋茄、桐花树和白骨壤最为耐寒,其耐寒性均大于红树科的木榄、海莲(Bruguiera sexangula)和红海榄(Rhizophora stylosa)。海桑(Sonneratia caseolaris)对温度的敏感性最强,抗寒能力最低,因此,即使在其原产地海南也受到较为严重的寒害,在纬度更高的引种地出现大面积受害甚至全部死亡,而从孟加拉国引种的无瓣海桑(Sonneratia apetala)却显示出一定的抗寒能力。同一地点的红树植物幼苗的抗寒能力低于大树。此次寒害也造成了苗圃场的种苗大量死亡,成熟的植株提前落花落果,这势必会影响后继一两年内红树林的自然更新和人工造林。因此,在未来红树林造林或人工引种中,一定要考虑到红树植物的抗寒能力。国家自然科学基金(30671646和30700092);厦门大学“闽江学者”启动基

病毒疫苗的颗粒性质

近年来,以类病毒颗粒为基础的基因工程疫苗的分离纯化成为一个亟待解决的问题。VLP是由蛋白质为主且可能包含其他组分的复杂生物体,容易因外部条件的变化产生过度聚集、解聚等一系列不利于免疫活性的结构变化。为了解决离子交换层析和超滤等步骤造成的结构变化导致活性降低的问题,发展条件温和的分离纯化介质和技术是当前的发展方向。</p

红豆杉浸膏在氧化铝催化下紫杉醇的生成研究

目的：研究在氧化铝层析初分离红豆杉浸膏中紫杉醇增量的来源。方法；采用Ｃ１８硅胶反相层析、氧化铝层析及硅胶层析等方法对物料进行处理，ＨＰＬＣ分析紫杉醇的含量。结果：紫杉醇增量主要来源于红豆杉浸膏中７－表－紫杉醇的碱性氧化铝催化下的异构化。结论；优化７－表－紫杉醇的异构化条件，可以增加－７－表－醇杉醇的转