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夜视目标识别在视频监控中起着非常重要的作用。从早期的红外热成像发展至今,激光夜视成像系统被广泛的应用。它不仅受到大气吸收和散射特性的影响,还与光学系统中的透镜及传感器的衍射极限有关。在既有成本下,通过图像复原和超分辨率重建,可以尽可能的提高夜视成像的成像质量。很多学者的研究结果表明,成像系统的点扩散函数作为先验知识,可以提高图像复原的质量。因此,本文在最大后验概率框架下,实现点扩散函数与凸集投影超分辨率重建相结合,并应用到半导体激光夜视成像探测系统中,客观的图像质量评价标准被用来决定迭代次数。目标识别的实验结果表明,用本文提出的重建方法可以有效提高半导体激光夜视成像的范围和成像质量。 相似文献
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AbstractThe Program for Cooperative Cataloging (PCC) has formal relationships with the Library of Congress (LC), Share-VDE, and Linked Data for Production Phase 2 (LD4P2) for work on Bibliographic Framework (BIBFRAME), and PCC institutions have been very active in the exploration of MARC to BIBFRAME conversion processes. This article will review the involvement of PCC in the development of BIBFRAME and examine the work of LC, Share-VDE, and LD4P2 on MARC to BIBFRAME conversion. It will conclude with a discussion of areas for further exploration by the PCC leading up to the creation of PCC conversion specifications and PCC BIBFRAME data. 相似文献
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目的:观测小鼠依次口服大剂量曼陀罗、闹羊花、马钱子、斑蝥等10种广西产有毒中药的半数致死量,以评价其安全性。方法:每种中药在死亡率0%(Dn)和100%(Dm)范围内确定5～7个给药剂量,每个剂量组用20只小鼠进行观察7天,用Bliss法计算出半数致死量(LD50)等数据。结果:从半数致死量看,半夏的毒性在所有10种受试中药中最低;斑蝥毒性最高。毒性大小顺序为:斑蝥>蟾酥>马钱子>曼陀罗>闹羊花>木鳖子>山豆根>蛇床子>木通>半夏。结论:①多数受试有毒中药与药典标注的毒性程度基本相符;②根据不同毒性中药的半数致死量,可为中毒案件的侦破和定论提供科学的依据。 相似文献
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Population structure and linkage disequilibrium in elite barley breeding germplasm from the United States 总被引：2，自引：0，他引：2
Hao Zhou Gary Muehlbauer Brian Steffenson 《Journal of Zhejiang University. Science. B》2012,13(6):438-451
Cultivated barley is known to have a complex population structure and extensive linkage disequilibrium (LD). To conduct robust association mapping (AM) studies of economically important traits in US barley breeding germplasm, population structure and LD decay were examined in a complete panel of US barley breeding germplasm (3 840 lines) genotyped with 3 072 single nucleotide polymorphisms (SNPs). Nine subpopulations (sp1‒sp9) were identified by the program STRUCTURE and subsequently confirmed by principle component analysis (PCA). Out of the nine subpopulations, seven were very similar to the respective subpopulations identified by Hamblin et al. (2010) which were based on half of the germplasm and half of the SNP markers, but two subpopulations were found to be new. One subpopulation was dominated by six-rowed spring lines from Utah State University (UT) and the other was composed of six-rowed spring lines from multiple breeding programs (USDA-ARS Aberdeen (AB), Busch Agricultural Resources Inc. (BA), UT, and Washington State University (WA)). LD was found to decay across a range from 4.0 to 19.8 cM. This result indicates that the germplasm genotyped with 3 072 SNPs would be robust for mapping and possibly identifying the causal polymorphisms contributing to disease resistance and perhaps other traits. 相似文献
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免疫抗毒散为纯中药制剂,经动物试验,其对20日龄罗曼母鸡的最大耐受量在35g/lg体质量以上,灌胃最大耐受量为32g/kg体质量,20%免疫抗毒散小白鼠腹腔LD50=0.3mL/20g体质量,LD50的95%的可信限为0.240～0.376 mL/20g体质量;以20%的浓度给小白鼠和雏鸡连续饮水20d,用药期间小白鼠和雏鸡的精神、食欲、生长发育均正常,剖解时组织器官无任何形态学变化;给孕鼠饮水20d,产仔数和仔鼠的发育与对照组无差异,表明使用免疫抗毒散非常安全。 相似文献
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Ｌａｓｅｒｄｉｏｄｅ (ＬＤ) ｐｕｍｐｅｄｈｉｇｈａｖｅｒａｇｅｐｏｗｅｒ ,ｈｉｇｈｒｅｐｅｔｉｔｉｏｎｉｎｔｒａｃａｖｉｔｙｆｒｅｑｕｅｎｃｙ ｄｏｕｂｌｅｄｓｏｌｉｄ ｓｔａｔｅｌａｓｅｒｈａｓｍａｎｙａｄｖａｎｔａｇｅｓ,ｓｕｃｈａｓｈｉｇｈｅｆｆｉｃｉｅｎｃｙ ,ｈｉｇｈｐｅａｋｐｏｗｅｒ,ｈｉｇｈ ｐｈｏｔｏｎｅｎｅｒｇｙ ,ｈｉｇｈｂｅａｍ ｑｕａｌｉｔｙ ,ｃｏｍ ｐａｃｔｎｅｓｓａｎｄｌｏｎｇｅｒｌｉｆｅｔｉｍｅ .Ａｍｏｎｇｔｈｅｍ ,ＬＤ ｐｕｍｐｅｄｆｒｅｑｕｅｎｃｙｄｏｕｂｌｅｄ ｇｒｅｅｎ… 相似文献
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自然语音作为人机交互具有广泛的应用前景。介绍了基于非特定人语音芯片LD3320的语音遥控器结构和实现方法。该语音遥控器利用STC89C52单片机作为主控器,控制LD3320对语音识别与处理,然后根据语音指令产生相应红外脉冲序列,替代按键式红外遥控器,实现对电器的语音遥控。 相似文献
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Self mixinginterferenceeffectshavebeenwidelystudied[1— 12 ] ,mostofwhichareconductedonsinglemodelasers.Wang[10 ] andYoshitada[11] reportedstudiesonmulti modesemiconductorlasersin 1993and 1994re spectively .Buttoourknowledge ,fewmodelsonLDpumpedmulti modesolid statelaserhavebeenreported .1 Basictheoryandgeneralmodel Theprincipleofself mixinginterferenceeffectsisexplainedasanexternalopticalfeedbackeffect[9] .Thege neralmodelisshowninFig .1,LcandLextstandforthelengthofthecavityandtheexter… 相似文献