红外光谱在润滑脂检测中的应用

介绍了红外光谱的定义及红外光谱技术的特点,详细讨论了红外光谱技术在润滑脂检测中的应用,并举例了红外光谱应用于脲基润滑脂、复合磺酸钙润滑脂中的检测.     

基于红外分光光度法的油烟检测装置设计

在分析目前油烟检测技术优缺点的基础上,设计了基于红外分光光度法检测技术的油烟检测装置。该检测装置利用化学方法对油烟进行在线检测,拥有传统红外分光光度法的优点,并可自动检测,远程输送数据。进行了装置检测的可行性相关实验,验证了本设计的科学性。     

Detection Algorithm for Sky-sea Line Based on The Canny Algorithm of Adaptive Threshold

海天线的检测是研究红外成像末制导技术的一项重要内容,对于识别红外图像中舰艇目标起到非常重要的作用.分析了红外图像的特点,给出了一种基于修正的Canny算法的海天线检测方法,根据所要处理的红外图像自适应选取Canny算法的阀值进行边缘检测,精确提取了海面和天空区域的分界线,即海天线.     

红外多波长无创人体血糖检测技术研究

红外多波长血糖检测是利用人体血管红外线的热梯度光谱信息．通过数学模型求出血糖浓度的无创伤的检测方法，特别适用于长期、频繁的血糖检测。研究了红外多波长无创人体血糖检测关键技术，取得了实验室成果。     

模极大值小波算法在红外图像点目标检测中的应用研究

在总结以往红外项目实现的基础上,着重学习研究了小波变换点目标检测技术,并就其工程实现进行了论证,尝试将模极大值小波算法应用到红外点目标检测项目中。     

基于形态学的红外小目标检测算法

在分析复杂天空背景下红外视频序列特征的基础上,针对红外小目标本身特性及红外序列低信噪比的问题,提出适合该环境的红外小目标检测算法.该滤波方法以形态学滤波理论为基础,首先采用均值滤波和Open ing-Tophat运算对红外视频序列进行预处理,然后运用基于均值和方差的统计分割方法提取图像中的运动目标,从而实现了红外小目标的检测.实验结果表明,所提出滤波方法具有良好的检测和分割效果,能够有效地改善跟踪精度.     

“红外吸收式气体检测技术研究”项目简介

<正>"红外吸收式气体检测技术研究"是由唐山学院机电工程系张帆老师主持的唐山市科学技术研究与发展计划项目。该项目针对目前我国煤矿广泛使用的载体催化型甲烷检测技术所存在的问题,深入研究了红外吸收式气体检测技术,系统研究了温度变化对甲烷气体检测的影响,应用神经网络建立了甲烷气体检测的温度校正模型,     

基于小波分析的红外弱小目标检测算法

针对红外弱小目标检测需求,根据红外弱小目标图像特性及其小波分析特性,提出了一种基于小波分析的红外弱小目标检测算法。算法首先对红外弱小目标图像进行小波分解;然后置低频小波系数为零去除背景,阈值化高频小波系数滤除噪声,自适应子带增强加强目标能量;最后进行小波逆变换并进行自适应阈值分割。实验结果表明,提出的算法速度快、抑制噪声的能力强。     

TPS2534新型红外气体浓度传感器的研究与应用

在分析非分光红外检测技术与Lamber-Beer定律的基础上,将TPS2534新型红外传感器应用于气体浓度检测技术中。重点介绍了该传感器的内部结构和外部引脚、主要特性、浓度检测理论依据以及信号采集和处理电路。该传感器具有精度高、稳定性好、体积小、响应迅速等特点。     

红外对管检测气液两相流型与液塞实验研究

在气液两相流实验中,流型、液塞速度是很重要的参数,需要进行检测.根据红外线可以穿透透明介质,且服从衰减定律的原理,使用红外对管以及检测电路制作了检测装置.在透明实验管路外部安装了3套检测装置,并以空气、水为介质进行实验,检测了不同流动情况下的感应电压,分析了不同流型下感应电压的特点,提出了根据感应电压特性判别流型的方法.根据液塞经过红外对管时检测电压的波动特点,检测了液塞速度,并与文献中的理论公式计算结果相对比,数据吻合较好.实验结果表明,红外对管可以用于气液流型判别与液塞检测.     

磁阻效应实验的设计

锑化铟既作霍尔元件测量了磁感应强度，又作磁敏电阻研究了其阻值随磁场的变化规律。不仅揭示了霍尔效应和磁阻效应在半导体内同时存在的事实，使产生2种物理现象的微观本质表现得更为突出，而且还消除了由于使用其他方法测量磁感应强度时，被测点与锑化铟所处位置不同而造成的系统误差。     

古埃(Gouy)法测磁化率实验的实践与应用

实验改进后,减少了清洗、烘干及冷却样品管的实验操作环节;装样长度可比原来或多或少(9.5~10.5 cm);一种试样固定用一支样品管进行实验.实验结果与理论值基本相符,比改进前误差小.改进后可大大地缩短实验时间,减少实验用品和降低实验费用,且减少了对实验室、环境的影响.在实验教学中反复应用,效果较好,值得推广.     

从关羽的“赤面”看《三国志演义》的作者问题

成书于金代的《三国志平话》中的关羽"面如紫玉";元杂剧三国戏中的关羽开始有"赤面"或"丹脸"的直接描述,如"红馥馥双脸胭脂般赤""绛云也似丹脸若频婆"等。蒙古族审美文化认为"赤面"或"红脸"象征着武勇,是好汉或英雄的体征之一;而《三国志演义》中关羽的"面如重枣"(疑原为"面如挣枣")之赤面的描写来自元杂剧三国戏而不是《三国志平话》,从而可推知《三国志演义》的作者就是《录鬼簿续编》所记载的戏曲家罗贯中。     

Toward effective group formation in computer-supported collaborative learning

Group formation task as a starting point for computer-supported collaborative learning plays a key role in achieving pedagogical goals. Various approaches have been reported in the literature to address this problem, but none have offered an optimal solution. In this research, an online learning environment was modeled as a weighted undirected complete graph in which each learner was implied as a node and the relationship between them was denoted as a weighted arc. The weight of each link indicated the similarity degree between the corresponding individuals. The similarity between two students was measured as the mean of their absolute interest levels. The graph was also represented through a symmetric adjacency matrix. Then, a novel binary integer programming formulation was proposed to model the group formation problem and optimally assign each learner to the most appropriate group. The method was utilized to divide an online class of 32 learners into 8 groups of size 4. Findings indicated that the suggested model was successful in optimally solving the problem in 20.53 seconds, on average. The performance of the method was also compared with a modified version of K-means clustering algorithm. Although, the running time of the suggested technique was not as good as the clustering algorithm, it generated better outcomes in theory and in practice.     

纳米TiO2粉体制备的影响因素及其结构表征

以钛酸四丁酯为前驱物,冰醋酸为螯合剂,盐酸作催化剂,乙醇作溶剂,通过适当控制反应条件和调节反应组分,采用溶胶-凝胶法制备了不同晶型的纳米TiO2,并对纳米TiO2进行一系列测试和表征。扫描电镜与透射电镜照片表明纳米TiO2粒径分布窄、分散性良好;能谱分析结果表明元素组成符合TiO2的成分组成;XRD图谱显示了纳米TiO2在不同温度下发生了晶型转变,即其晶型结构受煅烧温度的影响明显。     

2，4-D在明胶／壳聚糖微球中的包埋与释放

以明胶／壳聚糖复合物为水相,液体石蜡为连续油相,农药2,4-二氯苯氧乙酸（2,4-D）为芯材,Span80为乳化剂,通过醛交联,采用反相乳液法制备了2,4-D-明胶／壳聚糖微球．考察了制备条件对微球形貌及包封率的影响,并研究了2,4-D在微球中的释放性能．结果表明：当Span80为1mL,油水比为4：1,用一定量甲醛与戊二醛的混合物为交联剂,芯壁材比大于1：14时,制备的微球形态圆整,表面光滑,分散性较好．该复合微球中2,4-D的包封率为70．8％,具有良好的缓释性能,作为一种新型农药剂型可望在农业领域得到应用．     

Coping styles and emotional and behavioural problems among Norwegian grade 9 students

The main purpose of this study was to explore the relations between coping styles and emotional and behavioural problems among adolescent students. The study was conducted as a survey among a representative sample of 2006 Norwegian 9th graders. The results show that emotional problems are associated with self-blaming as well as aggressive coping. Off-task orientation was associated with little use of planning and frequent use of aggressive coping. Finally, aggressive coping was the main predictor of externalizing problems, with infrequent use of planning and frequent use of behavioural disengagement as other significant predictors.     

现代教育媒体在食品营养学教学中的应用研究

在幻灯片的制作中,尽量用图片代替文字,恰当地运用动画、超级链接、视频教学和网络教学等现代教育媒体,使零散的教学内容更加系统化,增加了课堂教学的趣味性,极大地丰富了教学内容,提高了教学效果。     

锂电池负极α-Fe2O3纳米粒子制备及电化学性能研究

以高分子微球聚苯乙烯（PST）和聚甲基丙烯酸甲酯（PMMA）作为组装体,采用自组装方法在PST和PMMA微球表面自组装制备纳米α-Fe2O3电池负极材料,组装温度为PST（T=70℃）和PMMA（T=60℃）聚合温度.结果显示,采用PST作为组装体获得的α-Fe2O3纳米粒子颗粒更细,约70nm,粒径更均匀,分散性更好;而PMMA组装体获得的纳米粒径约80nm,分散性相对较差,主要原因是PMMA微球质地较软,易发生变形,而使α-Fe2O3纳米粒子吸附在PMMA表面不均匀,在热处理过程中受热不均导致α-Fe2O3纳米粒子尺寸不均,且有团聚趋势.XRD显示,两种组装体获得的均为纯相α-Fe2O3结构.电化学性能显示,采用PST作为组装体制备的纳米α-Fe2O3作为电池负极电化学性能明显优于PMMA组装体.     

“Having Students is Entirely Necessary”: Tutors’ feedback of experiential learning in an MPharm programme (TELL Project)

There is an increased reliance on experiential learning tutors and placement sites, and as such there is a need to determine tutors’ perceptions about experiential learning as well as identify their needs. A mixed-methods study was undertaken involving tutors in hospitals and community pharmacies. There were 58 responses to the online survey. Five focus groups consisting of 25 hospital tutors, and 11 one-on-one interviews with community tutors were conducted. Experience as a tutor was dependant on students’ attitudes and engagement, with poor attitude highlighted as a challenge. Limited time and placement duration were also identified as challenges, while a benefit noted was opportunities for staff recruitment. There was good support for students being sent to primary care for placements. Programme improvement is needed, involving both tutors and students in the co-design of EL to address gaps and avoid future dissatisfaction as well as ignite a sense of ownership by all parties.