Study of the molecular basis of seasonal adaptation in mammals

doctoral thesi

Approximation properties of modified q- Phillips operators

引进一类修正Q-PHIllIPS算子,并研究该算子列的一些逼近性质.得到算子列的一个kOrOVkIn型收敛定理,给出了算子列收敛速度的估计和一个VOrOnOVSkAJA型结果.In this paper,a kind of modified q- Phillips operators is introduced,some approximate properties of the operators are studied.A convergence theorem of Korovkin type is established.Also,an estimate for the rate of convergence and a Voronovskaja- type result are given.国家自然科学基金资助项目(61170324); 福建省自然科学基金资助项目(2014J01021); 福建省教育厅科技资助项目(2012JA12324

文蛤多肽体外对人肺癌A549细胞的抑制作用

我们已从文蛤肉中提取得到1种具有抗癌活性的多肽,命名为Mer2.本文报道Mer2对体外培养的肺癌A549细胞的生物学效应.采用溴化二苯偶氮盐(MTT)法检测Mer2对肺癌A549细胞的抑制效果,并应用细胞形态观察法、Hoechst荧光染色和流式细胞术等方法,探讨了Mer2对细胞形态、细胞周期的影响.结果表明,Mer2对体外培养的肺癌A549细胞的生长有较强的抑制作用,对作用含量和时间均具有一定的依赖性.Mer2使细胞形态发生明显变化,明显地出现凋亡峰,但并没有出现明显细胞周期阻滞现象.这表明文蛤多肽可能通过诱导细胞凋亡从而抑制癌细胞的生长

Electrocatalytic Oxidation of Formic Acid on Pd/Ni Heterostructured Catalyst

通过两步还原法制备了Pd/Ni双金属催化剂.由于金属Pd原子在先行还原的Ni纳米粒子表面的外延生长以及其在Ni表面及Pd表面生长表现出的吉布斯自由能差异，最终导致了异结构Pd/Ni纳米粒子的形成.高分辨电子透射显微镜结果证实了异结构的存在，然而X射线衍射测量表明Pd/Ni纳米粒子具有类似于Pd的面心立方结构.制备的Pd/Ni纳米粒子与同等条件下合成的Pd纳米粒子相比对甲酸氧化呈现了更高的电催化活性，而且电催化稳定性也要明显优于纯Pd纳米粒子，证明Pd/Ni双金属催化剂是可选的直接甲酸燃料电池阳极催化剂.双金属催化剂对甲酸氧化电催化活性和稳定性增强可能是Ni原子的修饰改变了Pd粒子表面配位不饱和原子的电子结构所致.A Pd/Ni bimetallic nanostructured electrocatalyst was fabricated via a two-step reduction route. Owing to an epitaxial growth of Pd atoms on the surface of Ni nanoparticles, heterostructured Pd/Ni nanocomposites were formed and verified by high resolution transmission electron microscopy combined with energy-dispersion X-ray spectroscopy. X-ray diffraction confirmed that the as-prepared Pd/Ni nanocomposites possessed a single face-centered-cubic (fcc) Pd structure, probably due to a weaker diffraction intensity of metallic Ni and/or overlapping by that of Pd. The intrinsic catalytic activity on the Pd/Ni is higher than that on the Pd. Moreover, the durability of formic acid oxidation on the Pd/Ni was much enhanced over the Pd nanoparticles. The change in electronic structure of the surface coordination unsaturated Pd atoms and the possible dissolution of Ni species from the Pd/Ni heterostructure may account for such an improved durability for formic acid oxidation.This work was supported by the National Basic Research Program of China (973 Program) (No. 2012CB932800), the Natural Science Foundation of China (No. 21073219), Shanghai Science and Technology Committee (No. 11DZ1200400) and the Knowledge Innovation Engineering of the CAS (No. 12406, 124091231).This work was supported by the National Basic Research Program of China (973 Program) (No. 2012CB932800), the Natural Science Foundation of China (No. 21073219), Shanghai Science and Technology Committee (No. 11DZ1200400) and the Knowledge Innovation Engineering of the CAS (No. 12406, 124091231).作者联系地址：1. 中国科学院上海高等研究院，上海 201210；2. 中国科学院研究生院，北京 100039Author's Address: 1. Shanghai Advanced Research Institute, Chinese Academy of Sciences CAS, Shanghai 201210, China; 2. Graduate School of the CAS, Beijing 100039, China通讯作者E-mail：[email protected] & [email protected]

Electrocatalytic Oxidation of Formic Acid on Pt-Se Hollow Nanosphere Modified Glassy Carbon Electrodes

Corresponding authors. Email: [email protected],[email protected]; Tel:+86-13879159319.[中文文摘]以无定形硒溶胶为模板制备了不同硒覆盖度(θSe)(θSe=0.49,0.39,0.06,0)的Pt-Se和Pt纳米空球(分别记为(Pt-Se)HN和PtHN),发展了利用亚硫酸盐彻底除去核壳纳米粒子上Se的方法.对获得的纳米空球进行了形貌和结构的表征,结果表明所制备的(Pt-Se)HN粒径均匀,分散性好,球壳呈多孔结构.以其作为电催化剂制备了(Pt-Se)HN修饰的玻碳(GC)电极((Pt-Se)HN/GC),利用常规电化学方法比较该电极与PtHN/GC和商用碳载铂(Pt/C)修饰GC(Pt/C/GC)电极对甲酸的催化氧化作用,发现对甲酸氧化的活性顺序为(Pt-Se)HN/GC>PtHN/GC>Pt/C/GC.三种电极催化甲酸氧化的机理有所不同:前者更倾向于通过弱吸附中间体直接氧化成CO2的单途径机理进行,后两者则通过强吸附和弱吸附中间体的双途径机理进行.在一定Se覆盖度条件下,(Pt-Se)HN/GC对甲酸的氧化有助催化作用.[英文文摘]Platinum-selenium and platinum hollow nanospheres(denoted as(Pt-Se)HN and PtHN,respectively) with different coverages of Se(θSe)(θSe=0.49,0.39,0.06,0) were prepared using amorphous Se colloids as a sacrificial template.Sulfite was used to completely remove Se from the core-shell nanoparticles.The morphology and structure of the nanoparticles were characterized using various methods,which revealed a hollow structure with a very uniform size distribution and a porous structure on the shell.Assembly of Pt-Se hollow nanospheres ((Pt-Se)HN) on a glassy carbon (GC) electrode produced a (Pt-Se)HN/GC electrode. The electrocatalytic activity of the electrode for the oxidation of formic acid was compared with the PtHN/GC and commercial Pt/C/GC electrodes by cyclic voltammetry and chronoamperometry. The activity followed the order:(Pt-Se)HN/GC > PtHN/GC >Pt/C/GC. The electrooxidation of formic acid on (Pt-Se)HN/C, PtHN/C, and Pt/C catalysts follows different mechanisms: the former tends to directly oxidize formic acid to CO2 via weakly adsorbed intermediates, and the latter two via both weakly and strongly adsorbed intermediates.(Pt-Se)HN with a suitable selenium content showed optimal electrocatalytic activity for the oxidation of formic acid.国家自然科学基金(20663002); 厦门大学固体表面物理化学国家重点实验室基金(200511)资助项

The Design and Implementation of Criminal Investigation Management Information System

我国信息化建设起步晚，技术应用相对落后，各行业信息化战略规划不足。公安系统信息化建设起步更晚，省市一级的信息系统建设比较单一。现有的刑侦信息系统侧重于应用技术手段采集刑事案件的信息录入到系统，案件信息限于刑侦部门内部，不利于案件情况在公安系统内共享。而从一市或一个地区视角出发，在地区内建立一套信息共享的应用系统，为公安刑侦系统提供一个在线的案件信息管理系统，方便刑侦人员在最短时间内将一个地区的案件情况发布到各个职能部门，将促进协同办案，树立一个良好的办公形象，刑侦信息管理系统就是对刑侦信息化建设的理论性研究与底层应用系统的实践性建设。 刑侦信息管理系统的设计与开发，综合应用信息系统开发方法，...In China, the construction of Information system was started not until latest decades, used to applied backward technology to develop, we haven’t long lasting planning for it. As to the construction of public security information system started even later. Provincial and Municipal is focus on single-function information system. Meanwhile, most of criminal information system was designed to store c...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323183

红树林研究进展及遥感

红树林是生长在热带亚热带地区海岸潮间带的耐盐性木本植物群落，是海岸滩涂特有的植被类型，它具有巨大的生态价值和社会价值，在固岸护堤、御风消浪、净化水质、消除污染、美化海岸、保护农田村庄、保护生物多样性和创造良好的近海环境等方面具有显著的功能，是沿岸人为工程措施所无法取代的。此外全球变化研究中发现，沿海湿地尤其是红树林在调节气候方面所发挥的作用，是巨大的，美国国家科学基金会（NSF）指出红树林沼泽地的保护价值远大于其保护费用的支出，仅美国南佛罗里达州沼泽地红树林的碳储存价值就在数十亿美元左右[1]。 遥感技术具有探测范围大、获取资料的速度快、周期短、受地面条件限制少、手段多、获取的信息量大等优点，近年来己被广泛应用于社会各个领域。将遥感技术引入红树林监测中来，可以有效解决研究区域范围大、分布区难以到达、人力物力不足等问题，克服人工巡查只能以点或线的方式进行、难以获得研究区同步的大面积信息的缺点，满足全面动态监测的要求，在节省大量的人力和物力的同时，显著提高管理水平。遥感技术用于红树林研究，对红树林的管理和保护，具有十分重要的现实意义。 &nbsp;</div

海岸带灾害和污染的遥感监测进展

海岸带是人口、城市、经济最密集，人流、物流、资金流、信息流最活跃的地带，又是生态环境脆弱带，海陆气的相互耦合作用、全球变化以及人类活动的扰动，导致海岸带生态环境的脆弱化，成为一个灾害频发的敏感地带。2008年，《科学》杂志发文《人类对海洋影响的全球地图》指出全球未受人类活动侵害的海域只有4%[1]，海岸带受到人类干扰更大，海洋运输、生产活动、资源开发和陆地倾废等严重影响了海岸环境质量，海岸带的污染也成为不可忽视的问题。 根据文献中分类，海岸带灾害主要分为两类：一种是以自然因素为主引发的，例如风暴潮、沿海洪水洪灾、地震海啸等；另一类是人为因素主导的，例如赤潮和藻华、石油污染、近海水质污染、海洋垃圾污染等[2]。目前自然因素和人类因素互为因果、相互诱发，会形成新的灾害和污染，例如全球变暖下的海平面上升就是新的海洋灾害。 &nbsp;</div