Syntheses, Structures and Properties of Tetrazolate Coordination Polymers

本研究先合成了几种四唑型配体（2H-pbtz，HpytzH+·NO3–，2H-4batz），然后采用常温扩散及水热法，以锌，镉，铜（+2）离子和所合成的配体为原料，合成配位聚合物并测定了所合成的配体和配位聚合物的结构。它们分别是2H-pbtz(1),[Cd3(pbtz)3(DMF)4(H2O)2]·(DMF)4(H2O)4(2),[Mn(H2O)6](pbtz)(3),[Mn(H2O)6](C8H4N5)(4),HpytzH+·NO3–(5),[Cu3O(pytz)3(H2O)6]·9H2O(6),[Cu(pytz)2(H2O)2](7),[CuCl2(Hpytz)](8),2H-4batz(...In this research, three ligands with tetrazole groups and six tetrazolate-bridged coordination polymers have been synthesized through the combination of Zn(II), Cd(II), Cu(II) metal ions with tetrazoles by means of room temperature or hydrothermal reactions. Their structures and properties have been characterized. These complexes are 2H-pbtz (1), [Cd3(pbtz)3(DMF)4(H2O)2]· (DMF)4 (H2O)4 (2), [Mn(H2...学位：理学硕士院系专业：化学化工学院化学系_无机化学学号：20022500

Preparation and self-assembly of copper nanoparticles via discharge of copper rod electrodes in a surfactant solution: a combination of physical and chemical processes

地址: 1. Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] nanoparticles with a mean diameter of 10-15 nm were prepared and self-assembled via discharge of bulk copper rods in a cetyltrimethylammonium bromide (CTAB)/ascorbic acid solution. Ascorbic acid was used as a protective agent to prevent the nascent Cu nanoparticles from oxidation in the solution;, otherwise spindle-like Cu2O/CuO structures, with a lateral dimension of 30-50nm and length of up to 100nm, were formed in pure deionized water. The surfactant CTAB had a critical influence on self-assembly of spherical Cu nanostructures (with diameter of 700 nm-1mum). Such a low-temperature and non-vacuum method, exhibiting the characters of both physical and chemical processes, provides a versatile choice for economical preparation and assembly of various metal nanostructures. (C) 2004 Elsevier Inc. All rights reserved

The graphite arc-discharge in the presence of CCl4: Chlorinated carbon clusters in relation with fullerenes formation

通讯作者地址: Xie, SY (通讯作者), Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R ChinaThe graphite arc-discharge in the atmosphere consisting of CCl4 40 Torr and increasing partial pressure of He from 0 to 300 Torr produced, in addition to carbon species such as graphite and fullerenes C60 and C70, numerous chlorinated carbon clusters (CCCs). The yields of some CCCs, including C6Cl6 (perchlorobenzene), C10Cl8 (perchloronaphthalene), C12Cl8 (perchloroacenaphthylene) and C12Cl8 (isomer II), C14Cl8 (isomer I), C16Cl10 (perchlorofluoranthene), C18Cl10 (isomer I and II), and C20Cl10 (isomer I), correspond well with C60 yields, which may imply these CCCs share the same growth mechanism with fullerenes. Such a yield correlation can be used to distinguish the fullerene precursors from the irrelevant by-products, thus contributes to the mechanistic study of fullerene formation

类泛素蛋白及其中文命名

泛素家族包括泛素及类泛素蛋白,约20种成员蛋白.近年来,泛素家族领域取得了迅猛发展,并已与生物学及医学研究的各个领域相互交叉.泛素家族介导的蛋白质降解和细胞自噬机制的发现分别于2004和2016年获得诺贝尔奖.但是,类泛素蛋白并没有统一规范的中文译名. 2018年4月9日在苏州召开的《泛素家族介导的蛋白质降解和细胞自噬》专著的编委会上,部分作者讨论了类泛素蛋白的中文命名问题,并在随后的\"泛素家族、自噬与疾病\"(Ubiquitinfamily,autophagy anddiseases)苏州会议上提出了类泛素蛋白中文翻译草案,此草案在参加该会议的国内学者及海外华人学者间取得了高度共识.冷泉港亚洲\"泛素家族、自噬与疾病\"苏州会议是由美国冷泉港实验室主办、两年一度、面向全球的英文会议.该会议在海内外华人学者中具有广泛影响,因此,参会华人学者的意见具有一定的代表性.本文介绍了10个类别的类泛素蛋白的中文命名,系统总结了它们的结构特点,并比较了参与各种类泛素化修饰的酶和它们的生物学功能.文章由45名从事该领域研究的专家合作撰写,其中包括中国工程院院士1名,相关学者4名,长江学者3名,国家杰出青年科学基金获得者18名和美国知名高校华人教授4名.他们绝大多数是参加编写即将由科学出版社出版的专著《泛素家族介导的蛋白质降解和细胞自噬》的专家

Increment Based Data Transmission Technique for Cloud Storage Service

随着云计算技术的飞速发展，越来越多的用户选择使用云存储服务来保存个人文件。云存储共享与协作技术允许用户之间共享云端文件，支持其他用户通过各种智能终端上的客户端对文件进行读写操作。云存储共享与协作技术带来了文件历史版本大规模共享场景的需求，这对云存储系统的并发I/O性能是极大的考验。针对云存储服务共享场景的特点，挖掘文件历史版本之间的关系，采用基于增量传输的优化技术来提升云存储系统的传输性能。在此基础上，优化算法中强弱校验过程的内存占用和磁盘读写，利用文件历史版本数据优化同步流程，有效的减少数据传输量，并且提高系统的存储性能，适用于带宽有限和网络不稳定和大规模共享同步等极端场景。 With the fast development of cloud computing technology, more and more users choose cloud storage to store personal files. Storage and share technique allows users share files and visit others’ files with different kinds of client on the cloud. Storage and share technique brings the demand of large-scale share scene for the versioned files. This is a big challenge for the performance of simultaneously I/O. In this paper, according to the characters of the share scene in cloud storage, we try to dig the relationships between the versions of the file and take the increment based data transmission technique. By doing this, we optimized the performance of rolling checksum skill in increment algorithm and reduce the transmission quantity and improve system storage performance. In addition, this technique can help data transmission work in limited bandwidth and network instability scenario and large-scale share-synchronization scenario

一种利用石英晶体微天平检测DNA甲基化的方法

本发明公开了一种利用石英晶体微天平检测DNA甲基化的方法，该方法为：一、酶切消化待检测的DNA；二、PCR扩增；三、制备固定有探针分子的QCM芯片；四、将芯片用6-巯基-1-己醇孵育；五、将芯片装入石英晶体微天平的反应器中，向反应器中通入对照物，计算频率差值ΔF；六、将芯片装入石英晶体微天平的反应器中，向反应器中通入检测物，计算频率差值ΔF′，计算ΔF′与ΔF的差值的绝对值F，当F≥30Hz时判定待检测的DNA发生甲基化。本发明采用对质量变化灵敏的QCM与传统的甲基化酶切技术相结合，可有效区分DNA的甲基化状况，在检测过程中没有毒性试剂掺杂，检测速度快，效率高，重复性良好

Operation log based synchronization algorithm for cloud storage service with multiple clients

传统的基于状态的数据同步算法具有数据传输量大、每次都需要重新开始等缺点,不能满足实际应用需求,提出了一种基于操作日志的云存储数据同步算法.通过在服务器端记录用户的操作日志,对比操作日志生成同步操作序列,回放操作序列的方法实现了高效的数据同步.与传统算法相比,该算法具有数据传输量小,快速高效,对云端服务器负载小,支持双向和增量同步等优点.算法支持同步过程中的失效恢复,适用于带宽有限和网络不稳定等极端场景.The traditional data synchronization algorithm is based on the file status. Although it is simple to understand and implement, it does not support incremental update and lacks flexibility. So it does not meet the user's requirements. An operation logs based on synchronization algorithm is proposed, which records operation logs both at the server side and at the client side, and generates synchronization operation sequences by merging these logs. In contrast with the traditional method, the log based algorithm is more effective and has fewer loads to the cloud-side server. What is more, this algorithm supports failure recover, which is especially suitable for applying to the limited bandwidth and network instability scenario

利用光反馈VCSEL模式跳变产生随机数

近年来，在物理随机数生成速率的提高方面取得了很大的研究进展，但仍存在产生过程复杂和体积庞大等缺陷。针对该问题，文章从理论上提出了利用光反馈下垂直腔面发射激光器（VCSEL）模式跳变产生随机数的方案。通过光反馈扰动使VCSEL产生模式跳变，再由方波信号对注入电流进行调制，周期性重启VCSEL使其由非激射状态切换到模式跳变状态，最终输出随机脉冲序列实现随机数的产生。研究结果表明，具有通过随机性验证的无偏随机数能够以Gbit/s量级的速率连续产生。文章所提方案消除了对光/电转换和后处理操作的需求，简化了当前随机数的产生结构，且具有实现低成本光子集成随机数发生器的潜力

应用土壤无机氮测试进行棉花氮肥推荐研究

在南疆滴灌条件下进行氮肥大田试验,对应用土壤无机氮测试进行棉花氮素营养诊断及氮肥推荐进行了研究。结果表明,滴灌随水追肥技术有明显的增产节肥作用。在取得皮棉2728.8 kg.hm-2时,需施氮229.5 kg.hm-2。考虑土壤供氮能力,通过测定各生育期不同层次土壤供氮量,发现其与产量有很好的相关性,确定了相应的供氮量临界值。0~40 cm土壤供氮量对棉花产量有很大的贡献,40 cm以上层次的土壤无机氮可以表征土壤供氮能力。以0~20 cm土壤无机氮为氮素诊断指标,由土壤无机氮推荐施肥表,估算出了棉花各生育期应采用的氮肥追施用量