基于小波变换和零树法的水声信道

基于小波变换和“改变了的”零树法编解码原理, 结合水声信道的特点, 构建了一个以DSP 为核心的图 像处理系统。在不同压缩比的情况下, 完成了对一幅64×64 点阵的静态彩色图像数据的压缩和解压缩。当压缩比 与传统的JPEG 算法的压缩比相近的情况下, 解压缩后图像的总体观感效果有明显的改善, 从而对在水声信道中 传输彩色图像作出了积极的尝试。国家自然科学基金项目(60272028) ; 福建省自然科学基 金项目(D0110004

Progress on Agrobacterium tumefaciens-mediated Crop Transformation

分子生物学与植物基因工程的迅速发展,使得通过基因工程手段改良作物品质、改善作物耐胁迫能力、提高作物产量成为培育作物新品种的一种有效手段。为此,综述了农杆菌介导遗传转化的分子机制、标记基因的应用、作物转化研究进展和转基因应用前景。It is an effective method to cultivate new crops in genetic engineering means with the rapid development of molecular biology and plant gene engineering,which could improve crop quality,crop yield and the capacity of stress resistance.In this paper,the research progress of Agrobacterium-mediated molecular mechanism,the application of transgenic marker genes,the development of crop transformation and the prospect of transgenic application were reviewed.“948”国际引进项目(2011-G1-13);河南省科技创新杰出人才计划(114200510002);转基因生物新品种培育科技重大专项(2011ZX08004-005

老龄化背景下中国商业健康保险的社会保障作用研究

商业健康保险具有缓解社会保障支出的作用,对于社会保障具有积极影响。基于老龄化背景下针对中国商业健康保险的社会保障作用进行研究。研究结果发现当人均商业健康保险的保费收入增加时,全国社保基金中的人均医疗保险支出将可因此显著减少,这说明中国商业健康保险的发展有助于缓解社会保障支出,从而能够减轻政府财政支出的负担和压力,与当前政府所提倡的积极发展商业保险,从而推进"健康中国"的战略计划实行的政策相符

关于安溪县生态茶产业高质量发展的建议

福建省安溪县把生态建设作为推进县域经济可持续发展的战略方针,因地制宜开展生态茶产业建设,形成经济发展和生态建设协同发展、相互促进的局面。本文依托社会实践,在深入走访调查的基础上提炼出政府、茶企、专业合作社、行业协会和高校五个主体在安溪生态茶产业建设中发挥的主要作用,总结了安溪县生态茶产业的模式经验,并且针对存在的问题为安溪县打造茶产业生态圈建言献策,供全国其他进行县域经济发展和传统产业转型升级的地区参考

Medication rules in the treatment of digestive system neoplasms of WANG Yan-hui

目的:基于中医传承辅助平台软件,分析王彦晖教授治疗消化系统肿瘤的用药规律。方法:收集并筛选王教授于厦门燕来福国医堂治疗消化系统肿瘤病案,录入中医; 传承辅助平台软件,运用软件集成的数据分析方法,分析王教授治疗消化系统肿瘤的用药规律。结果:筛选出治疗消化系统肿瘤处方672首,分析得出其治疗消化; 系统肿瘤常用药物包括茯苓、陈皮、姜半夏、莪术、三棱、党参、白术、龙骨、牡蛎等,并演化出4首治疗消化系统肿瘤的新处方。结论:王教授治疗消化系统肿瘤; 以益气健脾、理气化痰、祛瘀散结为基本大法,扶正祛邪并重,同时根据闽南地区脾虚湿盛的致病特点重视健脾袪湿治法,并兼顾安神、止痛等治法以综合调理患者; 的机体状态。Objective: To study the medication rules in the treatment of digestive; system neoplasms of professor WANG Yan-hui using the traditional Chinese; medicine inheritance support system software (TCMISS, V2.5). Methods:; The prescriptions used by professor WANG Yan-hui in treating digestive; system neoplasms at the Yan-Lai-Fu Chinese Medicine Clinic were; collected as input data into TCMISS and were analyzed by software; integration method. Results: Totally of 672 prescriptions were selected; according to the collection standard in digestive system neoplasms; treatment. It was found that the most frequently used Chinese medicine; in these prescriptions including Tuckahoe, Pericarpium Citri; Reticulatae, Pinellia Tuber, Rhioxma Curcumae Aeruginosae, Rhizome of; Common Burreed, Root of Pilose Asiabell, Rhizome of Largehead; Atractylodes, Fossilizid, Oyster Shell, and so on. Furthermore, four new; prescriptions for treating digestive system neoplasms were created.; Conclusion: The core rules of professor WANG Yan-hui in treating; digestive system neoplasms were invigorating spleen and replenishing qi,; regulating qi-flowing for eliminating phlegm and dispelling stasis and; resolving hard mass, which means that strengthening vital qi and; eliminating pathogenic factor are equally emphasized in his; prescriptions. Besides, taking into consideration the climate; characteristics of the southern Fujian, professor WANG Yan-hui attaches; importance to invigorating spleen for eliminating dampness, combining; with tranquillization and relieving pain to treating patients; comprehensively.国家自然科学基金项目; 教育部新世纪优秀人才支持计划; 福建省自然科学基金项目; 厦门市科技计划项

Co-Ni-W三元系相图的实验测定与热力学计算

本研究采用合金法、电子探针显微分析仪(EPMA)和X射线衍射(XRD)技术,对Co-Ni-W三元系在1 000℃和1 200℃下的等温截面相图进行了实验测定。结合本研究和已报道的相平衡实验信息,基于CALPHAD (Calculation of phase diagrams)方法,对Co-Ni-W三元系相图进行了热力学优化与计算,获得了自洽性良好的热力学参数,计算结果与实验数据取得了良好的一致性。国家重点研发计划(2016YFB0701401)~

Anti-resonance features of destructive quantum interference in single-molecule thiophene junctions achieved by electrochemical gating

基于单个有机分子来构筑电子器件为电子器件微型化提供潜在技术方案。本研究发展了可集成电化学门控的单分子电子器件测试芯片技术和科学仪器方法，在实验和理论两个层面对具有相消量子干涉效应的噻吩衍生物分子器件的电输运过程进行了电化学调控研究，从而首次在室温下实现了对单分子电子器件中量子干涉效应的反共振现象的直接观测和调控，为制备基于量子干涉效应的新型分子材料和器件提供了全新的设计思路和策略。该研究充分展示了电化学调控技术在信息材料和器件领域的重要应用潜力，也体现了我校固体表面物理化学国家重点实验室在电化学研究和科学仪器研发领域的技术积累，以及面向科学前沿开展交叉学科探索的研究特色。 该研究工作是在洪文晶教授、上海电力大学陈文博教授、英国兰卡斯特大学Colin Lambert教授指导下完成的。化学化工学院博士生白杰和李晓慧为论文的共同第一作者，刘俊扬副研究员、师佳副教授、研究生唐永翔、刘帅、黄晓娟、谭志冰和萨本栋微纳研究院的杨杨副教授等也参与了研究工作。田中群教授和毛秉伟教授为该工作提供了重要指导。【Abstract】Controlling the electrical conductance and in particular the occurrence of quantum interference in single-molecule junctions through gating effects, has potential for the realization of high-performance functional molecular devices. In this work, we used an electrochemically-gated, mechanically-controllable break junction technique to tune the electronic behaviour of thiophene-based molecular junctions that show destructive quantum interference (DQI) features. By varying the voltage applied to the electrochemical gate at room temperature, we reached a conductance minimum that provides direct evidence of charge transport controlled by an anti-resonance arising from DQI. Our molecular system enables conductance tuning close to two orders of magnitude within the non-faradaic potential region, which is significantly higher than that achieved with molecules not showing DQI. Our experimental results, interpreted using quantum transport theory, demonstrate that electrochemical gating is a promising strategy for obtaining improved in-situ control over the electrical performance of interference-based molecular devices.This research was supported by the National Key R&D Program of China (2017YFA0204902), National Natural Science Foundation of China (21722305, 21673195, 21503179, 21703188), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Natural Science Foundation of Shanghai (17ZR1447100), Science and Technology Commission of Shanghai Municipality (14DZ2261000), China Postdoctoral Science Foundation (2017M622060) for funding work in Xiamen. It was also supported by EU Horizon 2020 project QuIET under grant agreement no. 767187EC FP7 ITN ‘MOLESCO’ project no. 606728 and UK EPSRC grants EP/N017188/1 and EP/M014452/1 and Leverhulme Trust (Leverhulme Early Career Fellowships no. ECF-2017-186 and ECF-2018-375) for funding instrumentation used in Lancaster. It was also supported by Hungarian and Czech Academies of Sciences (P2015-107) and Hungarian Research Foundation (OTKA 112034) for funding instrumentation used in Hungary. The authors thank Z.-Q. Tian and B.-W. Mao, Xiamen University, for useful discussions. 该工作获得科技部国家重点研发计划课题（2017YFA0204902），国家自然科学基金委优秀青年科学基金等项目（21722305、21673195、21703188、21503179）以及中国博士后科学基金（2017M622060）等项目的资助，也得到了固体表面物理化学国家重点实验室、能源材料化学协同创新中心的支持

城乡链接与农民合作

2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

Electric-field-induced selective catalysis of single-molecule reaction

随着单分子电学检测技术的迅速发展，分子电子学的研究不再局限于分子电子学器件的构筑及其电学性质的测量，而且扩展到单分子尺度化学反应过程的探索。然而目前相关的研究仍然局限于理论计算方面，在单分子尺度上实时监测和调控化学反应的活性和选择性是化学领域的长期目标和挑战。针对这一挑战，洪文晶教授课题组与程俊教授课题组合作，自主研发了精密科学仪器，将单个有机分子定向连接在两个末端尺寸为原子级的电极之间，解决了化学反应中分子取向控制的问题.理论计算结果证实了定向电场可以有效地稳定化学反应的过渡态，从而降低反应能垒。该研究工作在化学化工学院洪文晶教授、程俊教授、能源材料化学协同创新中心（iChEM）刘俊扬副研究员的共同指导下完成，由硕士研究生黄晓艳、iChEM博士研究生唐淳、博士研究生李洁琼以及兰州大学的陈力川博士作为共同第一作者，化学化工学院师佳副教授、陈招斌高级工程师、夏海平教授和田中群教授，萨本栋微纳研究院杨扬副教授、环境与生态学院白敏冬教授以及兰州大学张浩力教授参与了研究工作的讨论并给予指导，博士后乐家波、博士研究生郑珏婷、张佩（已毕业）、李瑞豪、李晓慧也参与了研究工作。Oriented external electric fields (OEEFs) offer a unique chance to tune catalytic selectivity by orienting the alignment of the electric field along the axis of the activated bond for a specific chemical reaction; however, they remain a key experimental challenge. Here, we experimentally and theoretically investigated the OEEF-induced selective catalysis in a two-step cascade reaction of the Diels-Alder addition followed by an aromatization process. Characterized by the mechanically controllable break junction (MCBJ) technique in the nanogap and confirmed by nuclear magnetic resonance (NMR) in bottles, OEEFs are found to selectively catalyze the aromatization reaction by one order of magnitude owing to the alignment of the electric field on the reaction axis. Meanwhile, the Diels-Alder reaction remained unchanged since its reaction axis is orthogonal to the electric fields. This orientation-selective catalytic effect of OEEFs reveals that chemical reactions can be selectively manipulated through the elegant alignment between the electric fields and the reaction axis.This work was supported by the National Key R&D Program of China (2017YFA0204902), the National Natural Science Foundation of China (21722305, 21703188, 21673195, 21621091, 51733004, 51525303, and 91745103), the China Postdoctoral Science Foundation (2017M622060), and the Young Thousand Talents Project of China. 该工作得到国家自然科学基金委（21722305、21703188、21673195、51733004、51525303、91745103），国家重点研发计划课题（2017YFA0204902），中国博士后面上基金（2017M622060）的资助，以及固体表面物理化学国家重点实验室、醇醚酯化工清洁生产国家工程实验室、能源材料化学协同创新中心的支持