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空间非合作目标物柔性捕获技术进展 被引量:11
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作者 郭吉丰 王班 +2 位作者 谭春林 刘永健 孙国鹏 《宇航学报》 EI CAS CSCD 北大核心 2020年第2期125-135,共11页
分类探讨了近年来出现的多种空间柔性捕获技术的原理及性能特点,给出了一些具有代表性的案例,结果表明:空间绳系捕获技术在理论及试验研究方面都相对成熟,是未来行之有效、可工程实现的柔性捕获方式之一。重点针对空间非合作目标物捕获... 分类探讨了近年来出现的多种空间柔性捕获技术的原理及性能特点,给出了一些具有代表性的案例,结果表明:空间绳系捕获技术在理论及试验研究方面都相对成熟,是未来行之有效、可工程实现的柔性捕获方式之一。重点针对空间非合作目标物捕获中容易出现的翻滚问题,对比分析现有的几种常用的接触式消旋方法,分析表明能同时实现捕获+消旋的一步式消旋法更具有应用前景。以空间绳系捕获技术作为空间柔性捕获的代表,对其捕获后的空间绳系组合体动力学模型建立过程中的系绳模型进行了综述,指出了各种系绳模型的优缺点及适用条件。对系绳控制机构进行了分类综述,给出了设计系绳控制机构需重点关注的问题。最后对空间绳系捕获技术的发展方向做了展望。 展开更多
关键词 合作目标 柔性捕获 消旋方法 系绳模型 系绳控制机构
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液相色谱-四极杆飞行时间质谱结合化学计量学方法筛查饲料中的未知药物 被引量:1
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作者 侯粲 邱静 +2 位作者 程永友 赵璐瑶 杨曙明 《分析测试学报》 CAS CSCD 北大核心 2016年第11期1409-1415,共7页
建立了液相色谱-四极杆飞行时间质谱(LC-Q-TOF/MS)对饲料中非目标污染物(兽药)的筛查方法,以及未知物的判定和确认技术。饲料样品经0.1%EDTA-乙腈-甲醇(1∶1∶1,含0.1%甲酸)混合溶液提取,Q-TOF全扫描模式采集数据,数据经过峰对齐... 建立了液相色谱-四极杆飞行时间质谱(LC-Q-TOF/MS)对饲料中非目标污染物(兽药)的筛查方法,以及未知物的判定和确认技术。饲料样品经0.1%EDTA-乙腈-甲醇(1∶1∶1,含0.1%甲酸)混合溶液提取,Q-TOF全扫描模式采集数据,数据经过峰对齐(质量误差5 m Da以内)、噪音过滤、自动排除无用峰等处理后,进行正交偏最小二乘判别分析(OPLS-DA)处理,根据Score图、S-Plot图和VIP图判定出特征离子,结合二级信息与自建谱库比对,进行结构式确认,或通过同位素丰度比例和分子式生成功能,确认分子式,结合二级断裂信息,判定特征离子的结构式,从而判定未知物的成分。结果显示:16份饲料样品共筛查出27种兽药。采用液相色谱-三重四极杆串联质谱法对其中的12种兽药进行定性定量分析,验证结果仅出现2个假阳性,兽药含量在12.5~152.0 mg/kg之间。通过LC-Q-TOF/MS结合OPLS-DA的方法能够对饲料中的非目标物进行筛查分析,方法准确度高。 展开更多
关键词 液相色谱-四极杆飞行时间质谱 非目标物 正交偏最小二乘判别分析 饲料 兽药
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基于商品化手持血糖仪的POCT研究进展
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作者 张永花 郑敏 《洛阳师范学院学报》 2019年第11期24-28,共5页
便携式、低成本和定量POCT研究是临床医学和诊断的变革.尽管进行了多年的研究,但很少有这样的设备可以投入市场.商品化血糖仪操作简单、价格低廉、检测效率高,因此在不改变血糖仪的构造和机理的提前下,将血糖仪用于更多非糖类目标物的... 便携式、低成本和定量POCT研究是临床医学和诊断的变革.尽管进行了多年的研究,但很少有这样的设备可以投入市场.商品化血糖仪操作简单、价格低廉、检测效率高,因此在不改变血糖仪的构造和机理的提前下,将血糖仪用于更多非糖类目标物的定量检测,成为当前研究热点之一.目前,国内外已有很多此类研究报道,本文综述了近十年来基于商品化血糖仪的POCT研究进展. 展开更多
关键词 床旁检测 血糖仪 糖类目标
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Motion Geometric Active Contours: Tracking Nonrigid Objects in Clutter Background 被引量:1
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作者 岑峰 Qi Feihu 《High Technology Letters》 EI CAS 2003年第3期19-23,共5页
MGAC (Motion Geometric Active Contours), a new variational framework of geometric active contours to track multiple nonrigid moving objects in the clutter background in image sequences is presented. This framework, in... MGAC (Motion Geometric Active Contours), a new variational framework of geometric active contours to track multiple nonrigid moving objects in the clutter background in image sequences is presented. This framework, incorporating with the motion edge information, consists of motion detection and tracking stages. At the motion detection stage, the motion edge map provides an approximate edge map of the moving objects. Then, a tracking stage, merely using the static edge information, is considered to improve the motion detection result. Force field regularization method is used to extend the capture range of the edge attraction force field in both stages. Experiments demonstrate that the proposed framework is valid for tracking multiple nonrigid objects in the clutter background. 展开更多
关键词 object tracking active contours Level Set Theory clutter background
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Construction of Two Gateway-compatible Destination Vectors for Tomato Functional Genomics under Abiotic Stress
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作者 CAI Yu-jing DENG Chun-ting LU Yong-en OUYANG Bo LI Han-xia 《Agricultural Science & Technology》 CAS 2011年第4期500-503,共4页
[Objective] This research aimed at constructing two gateway-compatible plant expression vectors for functional genomics of abiotic stress in tomato.[Method] pK2GW7I was generated from the plant expression vector pK2GW... [Objective] This research aimed at constructing two gateway-compatible plant expression vectors for functional genomics of abiotic stress in tomato.[Method] pK2GW7I was generated from the plant expression vector pK2GW7,0 by replacing the CaMV 35S promoter with abiotic-stress inducible plant promoter pRD29A,which was derived from the promoter of Arabidopsis gene RD29A.pKGW121 was generated by replacing the CaMV 35S of the plant expression vector pRD410 with the gateway recombinant cassette(attR1-cmR-ccdB-attR2)from pK2GW7,0.Constitutive and root-specific promoters were tested on pKGW121.[Result] Two gateway-compatible destination vectors,pK2GW7I and pKGW121,were successfully constructed;practicability test proved that pKGW121 was applicable for promoter analysis.[Conclusion] With the incorporation of gateway cloning technology or abiotic-stress inducible promoter,pKGW121 and pK2GW7I will be promising in large-scale investigation of tomato functional genes associated with various abiotic stresses.A high-throughput workflow for the construction of plant transformation vector was proposed and validated. 展开更多
关键词 GATEWAY Abiotic stress RD29A pK2GW7I pKGW121 GUS
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Multiple objectives application approach to waste minimization
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作者 张清宇 《Journal of Zhejiang University Science》 CSCD 2002年第4期405-411,共7页
Besides economics and controllability, waste minimization has now become an objective in designing chemical processes, and usually leads to high costs of investment and operation. An attempt was made to minimize waste... Besides economics and controllability, waste minimization has now become an objective in designing chemical processes, and usually leads to high costs of investment and operation. An attempt was made to minimize waste discharged from chemical reaction processes during the design and modification process while the operation conditions were also optimized to meet the requirements of technology and economics. Multiobjectives decision nonlinear programming (NLP) was employed to optimize the operation conditions of a chemical reaction process and reduce waste. A modeling language package-SPEEDUP was used to simulate the process. This paper presents a case study of the benzene production process. The flowsheet factors affecting the economics and waste generation were examined. Constraints were imposed to reduce the number of objectives and carry out optimal calculations easily. After comparisons of all possible solutions, best-compromise approach was applied to meet technological requirements and minimize waste. 展开更多
关键词 Waste minimization Multiple objectives optimization Chemical reaction process.
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