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Scale-UP of biomass conversion using 1-ethyl-3-methylimidazolium acetate as the solvent

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Green Energy & Environment 2019年第4期4卷 432-438页

作者： Ling Liang Jipeng Yan Qian He Tina Luong Todd R.Pray Blake A.Simmons Ning Sun Advanced Biofuels and Bioproducts Process Development Unit Lawrence Berkeley National LaboratoryEmeryvilleCA94608USA Joint BioEnergy Institute Lawrence Berkeley National LaboratoryEmeryvilleCA94608USA

This scale-UP study demonstrated the feasibility of an ionic liquid(IL)pretreatment process at 40 kg scale,using the IL 1-ethyl-3-methylimidazolium acetate([C2C1Im][OAc])as the solvent.The pretreatment was followed by enzymatic hydrolysis through which the process efficiency for biomass conversion to monomeric sugars was determined.The results show that 43 wt%of switchgrass was dissolved in IL after 2 h of pretreatment at 160℃ with 15 wt%solid loading.A 120 h enzymatic hydrolysis of the pretreated switchgrass results in 96%glucan and 98%xylan conversion.[C2C1Im][OAc]pretreatment has been successfully scaled UP to 40 kg with improved sugar titers and yields relative to bench scale(6 kg).The mass flow of the overall process was established and the major scale-UP challenges of the process were identified.

关键词： Ionic liquid 1-Ethyl-3-methylimidazolium acetate Pretreatment Scale UP Enzyme

Feather evolution: looking UP close and through deep time

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Science Bulletin 2019年第9期64卷 563-564页

作者： Xing Xu Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology & PaleoanthropologyChinese Academy of Sciences Center for Excellence in Life and Paleoenvironment Chinese Academy of Sciences

The last two decades have witnessed significant advances in our understanding of the evolution of major avian characteristics(1–6)In particular, the spectacular discoveries of fossilized feathered dinosaurs from China and elsewhere have provided key insights into feather evolution (1,2)These fossils indicate that many non-avialan dinosaurs were feathered animals just like living birds.

关键词： looking UP close and through deep time

Automatic video mosaicking algorithm via dynamic key-frame

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Journal of Systems Engineering and Electronics 2020年第2期31卷 272-278页

作者： JI Yufeng LI Weixing FENG Kai XING Boyang PAN Feng School of Automation Beijing Institute of TechnologyBeijing 100081China Kunming-BIT Industry Technology Research Institute Co. LtdKunming 650106China

Automatic video mosaicking is a challenging task in computer vision. Current researches consider either panoramic or mapping tasks on short videos. In this paper, an automatic mosaicking algorithm is proposed for both mapping and panoramic tasks based on the adapted key-frame on videos of any length.The speeded UP robust features(SURF) and the grid motion statistic(GMS) algorithm are used for feature extraction and matching between consecutive frames, which are used to compute the transformation. In order to reduce the influence of the accumulated error during image stitching, an evaluation metric is put forward for the transformation matrix. Besides, a self-growth method is employed to stitch the global image for long videos. The algorithm is evaluated by using aerial-view and panoramic videos respectively on the graphic processing unit(GPU) device, which can satisfy the real-time requirement. The experimental results demonstrate that the proposed algorithm is able to achieve a better performance than the state-of-art.

关键词： video mosaicking image stitching speeded UP robust feature(SURF) panorama mapping

Conjugated polymer nanoparticles as fluorescence switch for selective cell imaging

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Chinese Chemical Letters 2020年第3期31卷 755-758页

作者： Ke Peng Fengting Lv Huan Lu Jianwu Wang Hao Zhao Libing Liu Shu Wang Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Chemistry University of Chinese Academy of SciencesBeijing 100049China

Fluorescence switch plays a vital role in bioelectronics and bioimaging.Herein,we presented a new kind of facile electrostatic complex nanoparticles(ECNs)for fluorescence switching in cells and marking of individual cell.The ECNs were prepared by mixing positively charged poly(6-(2-(thiophen-3-yl)ethoxy)hexyl trimethylammonium bromide)(PT)and negatively charged diarylethene sodium salt(DAECOONa).DAE-COONa is a photoswitchable molecule which can be transformed between the ring-closed fo rm and ring-open form under the irradiation of UV or visible light.The closed-form of DAE-COONa can efficie ntly quench the fluorescence of PT through intermolecular energy transfer,while the open form of DAE-COONa does not influence the emission of PT.Thus,the fluorescence of ECNs can be modulated by light irradiation,and the ECNs with good fluorescence switching performance have been employed for fluorescence imaging and individual cell lighting UP process successfully.We demonstrate that the electrostatic complex strategy provides a facile method to construct fluorescence switch fo r selective cell marking and imaging applications.

关键词： Electrostatic complex nanoparticles Conjugated polymers Fluorescence switch Cell imaging Selective cell lighting UP

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基于自然场景在线学习的跟踪注册技术

软件学报 2016年第11期27卷 2929-2945页

作者：桂振文刘越陈靖王涌天中国电子科技集团公司第七研究所广东广州510310 北京理工大学光电学院北京100081 北京市混合现实与新型显示工程技术研究中心(北京理工大学) 北京100081

三维注册是移动增强现实的关键技术之一,提出了一种在线学习的跟踪注册方法,能够精确地对自然场景进行跟踪注册.该方法首先改进SURF(speeded UP robust features)描述符匹配方法,提高初始注册矩阵的正确性;然后,通过对场景进行有效的在... 详细信息

三维注册是移动增强现实的关键技术之一,提出了一种在线学习的跟踪注册方法,能够精确地对自然场景进行跟踪注册.该方法首先改进SURF(speeded UP robust features)描述符匹配方法,提高初始注册矩阵的正确性;然后,通过对场景进行有效的在线学习,提高注册精度;最后,利用前一帧的注册矩阵快速恢复已丢失的关键点,以提高注册的速度.实验结果表明,该方法能够较为流畅地对视频帧进行跟踪,并能保持较好的注册精度.

关键词：跟踪注册 SURF(speeded UP robust features)描述符在线学习

The Modernization of Chinese Civil Law over Four Decades

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Frontiers of Law in China-Selected Publications from Chinese Universities 2019年第1期14卷 39-72页

作者：王利明 School of Law Renmin University of China Beijing China Renmin University of China BeijingChina Civil Law Society of China Renmin University of China Beijing 100872China

This article reviews the historical development of Chinese civil law since reform and opening UP of China and argues that the primary achievement of civil law legislation over the last four decades has been the formation of a comprehensive civil legal system.Today's civil law system in China not only satisfies the institutional requirements for building a market economy but also constructs a legal rights system and establishes fundamental civil law principles,such as individual autonomy,equal protection,good faith,and fairness.In the 40 years since reform and opening UP,there have been significant innovations with regard to the specific systems,systemic structures,and fiindamental principles of Chinese civil law.This article summarizes the experiences of China's civil law legislation since reform and opening UP and looks ahead to how the anticipated "civil law codification" suitable for the modem era will develop a modem legal code based on China's domestic circumstances.

关键词： reform and opening UP 40 years Chinese civil law civil law codification

实行BOPS模式是否总是有益的?与传统双渠道的对比研究

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运筹与管理 2018年第2期27卷 168-177页

作者：刘咏梅周笛中南大学商学院湖南长沙410083

针对企业线上线下渠道融合战略中提出的BOPS(buy-online-and-pick-UP-in-store)模式,在集中式和分散式两情境下分别构建并对比了BOPS和传统双渠道模型,探讨了在传统双渠道基础之上引入BOPS服务是否对企业而言总是有好处的,并分析了传统... 详细信息

针对企业线上线下渠道融合战略中提出的BOPS(buy-online-and-pick-UP-in-store)模式,在集中式和分散式两情境下分别构建并对比了BOPS和传统双渠道模型,探讨了在传统双渠道基础之上引入BOPS服务是否对企业而言总是有好处的,并分析了传统型消费者占比和消费者的服务敏感性程度对企业实施BOPS的影响。研究表明,企业是否在传统双渠道模式基础上增设BOPS服务,取决于市场中传统型消费者占比规模(即偏好传统零售的消费者)以及各类型消费者对线下服务的敏感性程度;BOPS模式下,当消费者BOPS行为的真正动机是出于欲体验线下零售服务时,对实施BOPS的制造商企业而言更为有利;同时,企业的产品定价和线下服务水平不仅需要考量生产、服务成本,同样需对消费者的服务敏感性有准确的了解和定位。

关键词： Buy Online and Pick UP in Store 渠道整合传统双渠道服务

基于SURF特征和Delaunay三角网格的图像匹配

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自动化学报 2014年第6期40卷 1216-1222页

作者：闫自庚蒋建国郭丹合肥工业大学计算机与信息学院合肥230009

图像特征匹配的核心是通过距离函数实现在高维矢量空间进行相似性检索.重点研究提取好的特征点并快速准确地找到查询点的近邻.首先,提取图像的多量、有区别且稳健的SURF(Speeded UP robust feature)特征点,并将特征点凸包进行Delaunay剖... 详细信息

图像特征匹配的核心是通过距离函数实现在高维矢量空间进行相似性检索.重点研究提取好的特征点并快速准确地找到查询点的近邻.首先,提取图像的多量、有区别且稳健的SURF(Speeded UP robust feature)特征点,并将特征点凸包进行Delaunay剖分.然后,对Delaunay三角边抽样、聚类、量化并构建索引.通过票决算法,将点对匹配与否映射到矩阵中以解决距离度量没有利用数据集本身所蕴含的任何结构信息和搜索效率相对较低的问题.结合SURF算法和Delaunay三角网提出一种特征匹配的新方法,在标准图像集上的实验验证,在耗时基本相同的情况下,提取的特征点较多且正确匹配率较高.

关键词： SURF(Speeded UP robust feature)特征 Delaunay三角网格点对特征匹配

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学习型消费者情景下企业BBPD策略研究

管理科学学报 2020年第3期23卷 24-40页

作者：张凯山西大学管理与决策研究所太原030006

当前,有关基于消费者购买历史信息的价格歧视策略(BBPD)的研究普遍隐含着一个假设:消费者不具有学习性,即在两期动态模型中,消费者在购买前和购买后获得的基本效用保持不变,消费者并没有从消费中改变产晶的基本效用.显然,该假设与消费... 详细信息

当前,有关基于消费者购买历史信息的价格歧视策略(BBPD)的研究普遍隐含着一个假设:消费者不具有学习性,即在两期动态模型中,消费者在购买前和购买后获得的基本效用保持不变,消费者并没有从消费中改变产晶的基本效用.显然,该假设与消费者具有不同用户体验的现实不相符.基于此,本文构建了一个双寡头企业的三期动态博弈模型,通过假设消费者具有不同的用户体验,研究消费者在三期模型中的留下和转移行为,对比BBPD和UP(统一定价)两种定价策略之间的差异,探讨企业最优定价策略的战略选择问题.研究发现:企业总是对重复购买消费者制定高价,而对新消费者制定低价;与UP相比,BBPD导致更多的消费者在第二期和第三期转移,增加企业的第一期期望利润,并降低社会福利;当两个企业都能自主选择BBPD和UP时,(BBPD,BBPD)是纳什均衡解,两个企业都获得较少的第一期期望利润,即出现“囚徒困境”结果.

关键词：学习型消费者 BBPD UP 囚徒困境