一种机械故障监测的信息融合

在叶片振动故障监测过程中，单传感器的间断相位法只能测得叶片振幅值信息，本文应用两个传感器的信息融合技术，通过多源信息的综合、分析和推理，得出了叶片振动频率信息，提高了传感器系统的有效性，消除了单个传感器的局限性。     

重组B7-H1IgV融合蛋白的表达、纯化及活性鉴定

目的以B7-H1为靶点,研制肿瘤免疫治疗蛋白疫苗。方法将人B7-H1胞外片段IgV区基因插入pQE-30原核表达载体,转化大肠杆菌,经IPTG诱导表达。Ni2+-NTA亲和层析纯化蛋白,Westernblot鉴定。用纯化的rhB7-H1IgV蛋白免疫昆明小鼠,经ELISA、流式细胞术、免疫组化技术和CDC试验测定融合蛋白及其抗血清的生物学活性。结果所构建的pQE-30-TT-B7-H1IgV表达载体,能稳定表达rhB7-H1IgV蛋白,经纯化后免疫昆明小鼠,可获得高滴度抗B7-H1抗血清。经流式细胞术和免疫组化检测显示,其抗血清可与HT-29/B7-H1+及SP2/0肿瘤细胞结合,且在CDC试验中,可依赖补体杀伤HT-29/B7-H1+及SP2/0肿瘤细胞。结论rhB7-H1IgV融合蛋白不仅可引发小鼠体液免疫应答,而且其抗体还能与表达B7-H1的肿瘤细胞相结合,并介导补体依赖的体外杀伤作用。     

对苯基苯酚技术现状及应用

介绍了对苯基苯酚的主要用途,国内外对苯基苯酚主要的工艺路线及技术现状,通过对主要生产工艺路线的比较,对今后我国的对苯基苯酚的生产发展提出了建议。     

带观测滞后和不确定噪声方差的多智能体传感网络鲁棒序贯协方差交叉融合Kalman滤波

针对带观测滞后和不确定噪声方差的分簇多智能体传感网络系统,研究鲁棒序贯协方差交叉融合Kalman滤波器的设计问题.应用最邻近法则,传感网络被分成簇.应用极大极小鲁棒估计原理,基于带噪声方差最差保守上界的最差保守传感网络系统,提出了两级序贯协方差交叉(SCI)融合鲁棒稳态Kalman滤波器,可减小通信和计算负担并节省能量,且保证实际滤波误差方差有一个最小保守上界.一种Lyapunov方程方法被提出用于证明局部和融合滤波器的鲁棒性.提出了鲁棒精度的概念且证明了局部和融合鲁棒Kalman滤波器的鲁棒精度关系.证明全局SCI融合器的鲁棒精度高于每簇SCI融合器的精度且两者的鲁棒精度都高于每个局部鲁棒滤波器的精度.一个跟踪系统的仿真例子证明了鲁棒性和鲁棒精度关系.     

聚乙烯管道系统的连接技术问题(2)

介绍了各种聚乙烯管道系统的连接技术。连接常是管道系统成败的关键,各种连接技术都有其适用的范围。聚乙烯压力管道的连接以熔接为主,但有些场合需要机械密封连接。在聚乙烯的机械密封连接中特别要注意聚乙烯容易蠕变的特性。有些适用于聚氯乙烯管道的连接方法和设计不适用于聚乙烯管道。聚乙烯无压力管道的连接也有多种方法,要根据对于密封的要求选择。介绍了国内外为解决聚乙烯双壁波纹管承口刚度问题采用的种种做法。简介了交联聚乙烯管道和增强聚乙烯管道的特殊连接技术。提出在聚乙烯管道系统的连接方面希望国内外科技界关注的几个重要研究课题。     

Level of interest sensing in spoken dialog using decision-level fusion of acoustic and lexical evidence

Automatic detection of a user's interest in spoken dialog plays an important role in many applications, such as tutoring systems and customer service systems. In this study, we propose a decision-level fusion approach using acoustic and lexical information to accurately sense a user's interest at the utterance level. Our system consists of three parts: acoustic/prosodic model, lexical model, and a model that combines their decisions for the final output. We use two different regression algorithms to complement each other for the acoustic model. For lexical information, in addition to the bag-of-words model, we propose new features including a level-of-interest value for each word, length information using the number of words, estimated speaking rate, silence in the utterance, and similarity with other utterances. We also investigate the effectiveness of using more automatic speech recognition (ASR) hypotheses (n-best lists) to extract lexical features. The outputs from the acoustic and lexical models are combined at the decision level. Our experiments show that combining acoustic evidence with lexical information improves level-of-interest detection performance, even when lexical features are extracted from ASR output with high word error rate.     

Personalized identification of abdominal wall hernia meshes on computed tomography

An abdominal wall hernia is a protrusion of the intestine through an opening or area of weakness in the abdominal wall. Correct pre-operative identification of abdominal wall hernia meshes could help surgeons adjust the surgical plan to meet the expected difficulty and morbidity of operating through or removing the previous mesh. First, we present herein for the first time the application of image analysis for automated identification of hernia meshes. Second, we discuss the novel development of a new entropy-based image texture feature using geostatistics and indicator kriging. Third, we seek to enhance the hernia mesh identification by combining the new texture feature with the gray-level co-occurrence matrix feature of the image. The two features can characterize complementary information of anatomic details of the abdominal hernia wall and its mesh on computed tomography. Experimental results have demonstrated the effectiveness of the proposed study. The new computational tool has potential for personalized mesh identification which can assist surgeons in the diagnosis and repair of complex abdominal wall hernias.     

一种具有发展前景的饲料磷酸盐——脱氟磷酸三钙

脱氟磷酸三钙由于含钙量高、钙磷比适合于喂养家禽，是良好的饲料磷酸盐。它是由磷矿和其它添加物团粒，经高温焙烧后制成。具有工艺流程简单、生产成本低等优点。可结合本地情况，发展生产。     

硬质PVC挤出发泡材料的塑化性能研究

采用Haake转矩流变仪测定了挤出发泡PVC混合料的恒温、升温熔融塑化性能，结果表明：随着PVC树脂聚合度增加，塑化时间和加工转矩增加；随着ACR加工助剂用量和分子质量的增加，塑化时间缩短，转矩增加；ACR抗冲改性剂具有类似ACR加工助剂的塑化改良行为；添加填充剂碳酸钙促进PVC熔融塑化；ADC发泡剂可延缓PVC混合料的塑化速率、提高熔体粘度，添加发泡剂NaHCO3将大大延缓混合料的塑化速率。