基于量子级联激光器的ADN基液体发动机稳态燃烧CO特征浓度的实验测量

二硝酰胺铵(AND)作为一种绿色无毒推进剂已在固体推进剂以及液体推进剂领域得到一定程度的应用,是未来化学推进技术的一个新方向.目前我国正处于ADN基液体推进剂研究的起始阶段,对于其燃烧反应过程的研究是当前的一个研究重点.由于ADN基液体推进剂催化分解及燃烧反应过程复杂,相关的实验结果国内外公开文献发表较少,因此有必要开展ADN基液体发动机催化分解及燃烧反应的实验研究.本实验采用基于量子级联激光器的吸收光谱诊断技术,对ADN基液体发动机燃烧室内燃烧过程进行探究.CO是ADN基液体推进剂催化分解及燃烧反应的特征产物之一,通过测量ADN基液体发动机典型工况下CO的特征浓度,可以定量获得ADN基发动机...</p

病毒对海洋细菌代谢的影响及其生物地球化学效应

病毒是海洋生态系统中丰度最高的生命形式,其中超过90%属于浮游细菌(细菌和古菌)病毒,是海洋生态系统的重要参与者和海洋生物地球化学循环的重要驱动力。作为海洋浮游细菌主要的致死因子之一,病毒通过裂解宿主释放出大量的有机物和营养盐,调控宿主群落的代谢行为,进而影响生物地球化学循环。同时,伴随侵染的发生,病毒挟持宿主细胞的代谢系统完成自身的生命周期,从而改变宿主胞内的代谢途径和代谢产物。概述了病毒在个体层面和群落层面对海洋浮游细菌代谢的影响,及其对海洋元素循环的作用,评估了气候变化、环境因子对病毒调控细菌代谢的潜在影响,有助于人们对微生物参与的海洋生物地球化学循环的全面认识。国家自然科学基金优秀青年科学基金项目“海洋病毒生态学”(编号:41522603);国家自然科学基金面上项目“溶源性噬菌体对海洋细菌生理生态特性的影响”(编号:31570172)资助~

Review on the development of chemiluminescence immunoassay

化学发光免疫分析法(CHEMIluMInESCEnCE IMMunOASSAy,ClIA)是一种高灵敏度高特异性的检测分析技术,具有广泛的应用领域。本文简要介绍了化学发光免疫分析法的分类、发展和应用,重点从实际应用的角度阐述了化学发光在解决低丰度低信噪比、多组分检测、高速自动化等方面的发展情况,以及简要介绍了新型材料、试剂和技术应用于化学发光体系的进展,并对化学发光免疫分析法的发展趋势进行了展望。Chemiluminescence immunoassay(CLIA) was a widely used technology attribute to its high sensitivity and specificity.The classification, recent advances and the application of chemiluminescence immunoassay were reviewed.This review was focused on the advances of chemiluminescence immunoassay in practical application, especially in improving the signal-to-noise ratio of low abundance samples, multianalyte detection, rapid and automatic detection.In addition, the advances of new materials, reagents and technologies applied in chemiluminescence immunoassay were briefly reviewed.And the development trend of chemiluminescence immunoassay was prospected.国家高技术研究发展计划(863计划)(2011AA02A101

Multiple Background Model-Based Moving Target Detection on Sea Surface

提出一种在反射光较强的条件下基于多背景模型的海面运动目标检测方法.使用基于统计模型的变化检测方法将被监控场景区分为海浪波动显著的背景区域和海浪波动不显著的背景区域;对这两种区域中的像素点分别以Weibull分布模型和Gauss分布模型建立背景模型;使用建立的背景模型检测海面的运动目标.实验结果表明,在海面反射光较强且波浪波动较大的情况下,用该方法可以比较准确地检测到海面的运动目标. A new method based on multiple background model for moving target detection on the sea surface is proposed. It can detect the moving target on the sea surface when there is heavy sea clutter and the reflected light is strong. The monitored area is first partitioned into two regions using the statistical model-based change detection method, where the sea clutter in one region is heavier than the other. Then Weibull distribution is used to create the background model for pixels in the region having heavier sea clutter and Gaussian distribution is used for the other region. Finally the background model is used to detect moving target on the sea surface. Experimental results show that the proposed method can detect moving target effectively even when the sea clutter is heavy and the reflected light is strong.国家自然科学基金资助项目(60175008);; 国家创新研究群体项目(60024301

Design and Implementation of Intelligent Home Control System Based on Android and Arduino

作为时下最炙手可热的移动应用端操作系统,Android以其显著的开放性、便于开发的灵活性、能够与Google应用的无缝对接性及丰富的第三方软硬件; 资源等成为智能应用系统不可或缺的组成部分;Arduino单片机系统以其开源的电子原型平台、灵活便捷的设计和丰富的传感器资源等被广泛应用。其与Ja; va和C语言相类似的基于; Wiring/Processing的语言开发环境更是受到越来越多的电子爱好者和开发者的青睐。本文以移动手机安卓系统为无线控制终端,结合Ardui; no单片机系统,设计并实验仿真了一款基于Android与Arduino的智能家居控制系统,以控制; LED灯示例,通过网络http传输控制指令到Arduino单片机系统,Arduino根据所接收到的指令,控制不同的家居电器完成所要求的工作任务。; 仿真实验表明,文章所设计方法行之有效,可以灵活的运用到日常家居电器设备,提供了一种智能家居系统设计的新思路,具有易实现,应用广的特点。As one of the most sought-after mobile application terminal operating; system, Android has become an indispensable part of the intelligent; application system, because it has the features of definite openness,; flexibility for development, perfect connection with Google applications; and abundant third party software and hardware resources and so on.; Arduino MCU system is widely used in society because of its; characteristics of open source electronic prototype platform, flexible; and convenient design, rich sensor resources, etc. Moreover, its classes; Java and C language based on Wiring/Processing development environment; are becoming more and more popular among the electronics enthusiasts and; developers. Taking the mobile phone Android system as wireless control; terminal, and combining Arduino MCU system, an intelligent home control; system based on Android and Arduino is designed and implemented in this; paper. By controlling LED lamp samples, with the network HTTP; transmission control instructions sending to the Arduino MCU system, and; according to the received instructions, Arduino can control different; household electrical appliances to complete the required tasks.; Experiments show that the methods designed in this paper can be flexibly; applied to daily household appliances, such as, home appliance control,; security equipment, etc. This paper provides a new idea for the design; of intelligent home system, which is easy to implement and widely used.2015年度"福建省高校杰出青年科研人才培育计划"项目; 2015年福建省高等学校创新创业教育改革项目;; 2016年本科高校重大教育教学改革研究项目; 2016年省级互联网实验教学示范中心项目; 2016年福建省高等学校服务产业特色专业建设项

Research on Image Recognition Basd on BP Neural Network

BP神经网络具有较强的容错性和自适应学习能力,因而在数字图像识别领域有着广泛的应用。本文在经典BP神经网络的基本算法的基础上,对BP算法的参数设置进行了优化,实现了一种基于分类的改进BP神经网络算法。通过探讨BP神经网络在数字图像分类识别中的应用,详细考察了各种参数对识别效果的影响。实验结果证明改进后的算法有很好的实用价值。Back-propagation neural network with high fault-tolerance and good adaptive learning ability,is found great applications in digital image recognition.This paper presents an improved algorithm through setting new parameters based on traditional BP algorithm,applies it to digital image recognition and analyzes the influence produced by improved parameters.The experimental result shows that the improved algorithm has a certain practical value.国家985二期信息创新平台项目(0000-X07204

老年原发性干燥综合征患者血清miR-146a和miR-155表达及临床意义

目的探究miR-146a和miR-155在老年原发性干燥综合征(PSS)患者血清中的表达及临床意义。方法老年PSS患者80例(疾病组)和同期健康体检者80例(对照组)为研究对象,采用实时荧光定量PCR法检测血清miR-146a、miR-155表达水平,采用阻抗法检测血清白细胞(WBC)含量,采用免疫比浊法测定血清免疫球蛋白(Ig)G抗体水平,采用间接免疫荧光法检测血清抗核抗体(ANA),采用免疫组化法检测血清抗SSA、抗SSB抗体,采用Pearson法分析miR-146a、miR-155及二者分别与WBC、IgG的相关性;采用受试者工作特征(ROC)曲线分析检测miR-146a、miR-155表达水平对PSS诊断价值。结果与对照组比较,疾病组血清中miR-146a表达水平明显升高(P<0.001),miR-155表达水平明显降低(P<0.001),血清中WBC数量显著减少(P<0.001),IgG水平显著增加(P<0.001);与抗ANA阴性组、抗SSA阴性组、抗SSB阴性组比较,抗ANA阳性、抗SSA阳性组、抗SSB阳性组miR-146a表达水平显著升高,miR-155表达水平显著降低(P<0.001);PSS患者血清中miR-146a与miR-155表达呈显著负相关(r=-0.718,P<0.05),与WBC呈显著负相关(r=-0.694,P<0.05),与IgG呈显著正相关(r=0.690,P<0.05);PSS患者血清中miR-155与WBC呈显著正相关(r=0.566,P<0.05),与IgG呈显著负相关(r=-0.693,P<0.05);血清miR-146a、miR-155表达水平诊断PSS疾病的曲线下面积(AUC)为0.831、0.834,截断值为0.625、0.651,特异度为0.825、0.838,灵敏度为0.800、0.813;二者联合诊断PSS疾病的AUC为0.884,特异度为0.925,灵敏度为0.763。结论 miR-146a在PSS患者血清中高表达,miR-155低表达,二者呈负相关,可能参与PSS发生发展过程,对PSS早期诊断有一定参考价值。国家自然科学基金项目(No.81571585

An Efficient(k,p) Notational System Transform Algorithm

多进制编码和混合进制编码广泛应用于信息隐藏领域,影响其编码性能的一个关键因素是进制转换效率.针对任意k进制序列到P进制序列的相互转换,提出一种高效的进制转换算法,并根据信息论证明了其最优性.利用新算法改进了kT-lEX文本隐写系统、网页等价标记隐写术、图着色编码和APPM编码等多种基于混合进制编码和分组多进制编码的隐写术,有效提高了原方法的隐写性能.理论分析和实验结果均表明了该算法的有效性.Muti-ary codes and mix-ary codes are widely used in information hiding, while the transfer efficiency between notational systems is an important factor of coding efficiency.An effective notational system transfer algorithm based on double-coding method is proposed for transforming arbitrary k-ary sequences to p-ary sequences.It is proved that the proposed notational system transform algorithm is optimal.The method is applied to improve embedding efficiency of several kinds of steganographic algorithms based on mix-ary codes or grouped multi-ary codes, including KT-Lex steganographic system, webpage steganography based on equal tag, grid coloring codes and APPM codes.Both theory analysis and experimental results show that the proposed method is effective.国家自然科学基金(No.60803155;No.60970141;No.60902102;No.61274133); 中国科学院战略性先导专项课题基金(No.XDA06030601); 国家重大科技专项基金(No.2010ZX03004-003); 郑州市科技创新团队项目基金(No.10CXTD150)资

Performance of the fuel injector in supersonic combustor

Enhancing the fuel-air mixing is critical for scramjet combustor performance. The performance of four different aerodynamic ramp injectors was reported in this paper. The experiments were conducted in a direct-connected scramjet test facility. The concentration profiles were obtained by gas sampling and chromatogram analysis. The pictures of the flow field were obtained by using laser scatter. It would be used to analyze the flow field generated by the aerodynamic ramp, then optimize the layout of the injectors. The results would offer some useful information for engine design. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc

Measurement of temperature, velocity and water vapor concentration in a scramjet combustor based on nearinfrared diode laser absorption

A multi-channel Tunable Diode Laser Absorption Spectroscopy (TDLAS) system was designed and constructed for flow parameters diagnostics in a scramjet combustor. Two fiber coupled distributed feedback (DFB) lasers with narrow line width were used to probe two H2O absorption features (7185.597cm-1,7444.35cm-1+7444.37cm-1(c ombined)) by using direct absorption Time-Division-Multiplexing (TDM) strategy at a 4-kHz repetition rate. Laser light was split into five beams and transmitted across the test region. Two motorized precision translation stages were used to move the collimators during the test, so that the three beams located near the cavity and at the exit of the combustor can scan the cross sections respectively. Flow parameters could be obtained simultaneous which included average temperature, water vapor concentration and velocity at the entrance of the combustor, the distribution of temperature, water vapor concentration at a cross section near the cavity, the distribution of temperature, water vapor concentration and velocity at the exit cross section of the combustor. The parameters of the flow entering and exiting the combustor could be used to evaluate the performance of the direct-connected scramjet facility and the combustion efficiency of the combustor. The parameters at the cross section in the combustor could also be used to analysis combustion characteristics in the combustor