Immobilized cultivation of Dictyostelium discoideum with polyurethane foam

研究了聚氨酯泡沫应用于固定化盘基网柄菌的可行性,发现以简单处理过的聚氨酯泡沫为载体,能够高效实现盘基网柄菌的固定化培养。考察了载体粒径大小、载体量和摇床转速等对固定化培养的影响,在优化的培养条件和固定化条件下,盘基网柄菌的最大细胞密度是悬浮培养的2~4倍。The immobilization of D.discoideum with polyurethane foam(PUF) was proposed and the effects of PUF's properties on the immobilization was examined.The results showed that PUF was a suitable carrier for the efficient imoblization of D.discoideum.The effects of PUF addition and culture conditions were optimized to attain high density of D.discoideum.Under optimized culture conditions,high cell density of D.discoideum(4.56×107 cells/mL) has been achieved in the shake flasks,which was 2～4 times higher than that of free-cell culture in the axenic medium.国家自然科学基金资助项目(30370039

Holistic CNN Compression via Low-rank Decomposition with Knowledge Transfer

近日，国际顶级学术刊物《IEEE Transactions on Pattern Analysis and Machine Intelligence》（PAMI）接收了厦门大学信息科学与技术学院纪荣嵘团队的最新研究成果“Holistic CNN Compression via Low-rank Decomposition with Knowledge Transfer”。PAMI是计算机科学领域最顶级的国际期刊，其影响因子为 9.45。 该论文提出了一种统一的全局卷积神经网络压缩框架，简称为LRDKT，其目标在于统一加速与压缩卷积神经网络。该工作是厦门大学博士生林绍辉和导师纪荣嵘教授团队的阶段性研究成果，目前论文相关代码已开源。团队该方向的前期成果已经发表在AAAI/IJCAI等CCF-A类国际会议上。该论文由我校博士生林绍辉与其导师纪荣嵘教授（通讯作者）、硕士研究生陈超、悉尼大学陶大成教授、美国罗彻斯特大学罗杰波教授等合作完成，这也是我校研究生第二次在计算机领域的最顶级刊物上以第一作者身份发表论文，标志着我校信息学科研究生培养质量的突破。【Abstract】Convolutional neural networks (CNNs) have achieved remarkable success in various computer vision tasks, which are extremely powerful to deal with massive training data by using tens of millions of parameters. However, CNNs often cost significant memory and computation consumption, which prohibits their usage in resource-limited environments such as mobile or embedded devices. To address the above issues, the existing approaches typically focus on either accelerating the convolutional layers or compressing the fully-connected layers separatedly, without pursuing a joint optimum. In this paper, we overcome such a limitation by introducing a holistic CNN compression framework, termed LRDKT, which works throughout both convolutional and fully-connected layers. First, a low-rank decomposition (LRD) scheme is proposed to remove redundancies across both convolutional kernels and fully-connected matrices, which has a novel closed-form solver to significantly improve the efficiency of the existing iterative optimization solvers. Second, a novel knowledge transfer (KT) based training scheme is introduced. To recover the accumulated accuracy loss and overcome the vanishing gradient, KT explicitly aligns outputs and intermediate responses from a teacher (original) network to its student (compressed) network. We have comprehensively analyzed and evaluated the compression and speedup ratios of the proposed model on MNIST and ILSVRC 2012 benchmarks. In both benchmarks, the proposed scheme has demonstrated superior performance gains over the state-of-the-art methods. We also demonstrate the proposed compression scheme for the task of transfer learning,including domain adaptation and object detection, which show exciting performance gains over the state-of-the-arts. Our source code and compressed models are available at https://github.com/ShaohuiLin/LRDKT.This work is supported by the National Key R&D Program (No.2017YFC0113000, No.2016YFB1001503), Natural Science Foundation of China (No.U1705262, No.61705262,No.61772443, No.61572410). 该项研究得到了国家重点研发专项（No.2017YFC0113000, and No.2016YFB1001503）、国家自然科学基金联合重点项目（No.U1705262）的资助

第十八届美国理论与应用力学大会总结

1会议概况2018年6月5—9日,第18届美国理论与应用力学大会(18th U.S. National Congress of Theoretical and Applied Mechanics, USNCTAM2018)在美国芝加哥召开.本次大会由美国力学国家委员会和中国力学学会联合主办,旨在探讨和交流近四年世界范围内在理论和应用力学领域的基础研究、创新技术的最新进展,吸引了来自世界各地的近千名专家学

闽南文化研究国际笔谈会论点选载

2013年12月21日,由闽南师范大学闽南文化研究院主办的“2013闽南文化研究国际笔谈会“在国际学术交流中心召开。来自海峡两岸及日本、新加坡等国家的闽南文化研究方面的专家、学者二十余人出席了会议。会议围绕着闽南文化的内涵、外延及特征,闽南文化的当代价值与社会功能,闽南文化研究的理论与方法,闽南文化的跨文化阐释,闽南文化的世界性及其意义,闽南文化与两岸交流,闽南文化的生态保护,闽南文化学科建设与人才培养等议题展开了深入的研讨,言简意赅,探幽发微,对当下闽南文化理论研究势必产生积极的影响。本期节录专家们的精彩发言,以飨读者,也希望由此来带动和促进闽南文化研究的进一步升华

Studies of the Formation of Carbon Clusters

通讯作者地址: Huang, RB (通讯作者), Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R ChinaExperimental and theoretical studies focusing on the formation of carbon clusters are described. In the experiment on discharge in liquid chloroform, a series of perchlorinated fragments of C-60 was synthesized and a scarce amount of C-60 was detected. In the laser vaporization experiments, it was found that the production of C-60(+) and other fullerene ions could be promoted by doping chlorine-containing compounds into carbon targets. Chlorine atoms were found to play key roles of not only tying up the dangling bonds of the polycyclic carbon clusters. but also catalyzing the formation of fullerenes. The results showed that C-60 and other fullerenes are formed from growth of small carbon species and supported the "Pentagon Road" scheme of the fullerene formation mechanism. On the other hand, ab initio calculations were carried out on formation reactions of C-60 from its various perchlorinated fragments, C-60 (2m) Cl-10. The monotonically decreasing calculated energies of reactions with growing size of the fragments confirm that the formation reaction is energetically favourable

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

剪切变稀流体中气泡溶解的模拟计算

气液传质设备普遍存在于食品,生物发酵和聚合物等工业应用中。探究单气泡在液相中的动力学特征及传质机理,可以为科学设计放大气液传质设备提供依据。有关气体在非牛顿流体中传质过程的研究比较少。与实验研究相比,数值模拟可以提供详细的流场信息,更有助于对传递机理的认识。目前文献中的数值模拟通常都是采用气泡体积不变的简化模型,本文采用level set方法计算可变体积的气泡在剪切变稀流体中的非稳态溶解过程,模拟结果与实验结果吻合。研究了不同浓度CMC溶液及不同气泡直径对传质过程的影响,计算结果发现,与牛顿流体中的气液传质过程相比,剪切变稀流体中的传质尾迹更长,传质速率更高。直径较大的气泡的传质系数较高

莱州湾海底有缆观测网自适应监控系统开发

文章为莱州湾海洋牧场海底观测网络开发了自适应可扩展的远程监控系统实现对海洋牧场环境的长期连续在线监测。针对观测网络的需求，文章建立了远程监控系统的控制模型，创新地设计出了针对海底观测网络数据海量、异构、多源和多维度等特点的通信机制以及通信协议，便于实现海底观测网络大量设备即插即用的动态管理算法，并改良了数据质量控制算法。莱州湾海洋牧场应用示范数据显示，数据丢包率低至1%，指令执行成功率达到98%，海底设备增删改时，系统可以在2 min内完成映射解析数据，同时，数据质量控制算法能有效剔除异常值，将错误率降低至0.000 81%。莱州湾海洋牧场成功应用的示范证明了该系统的性能和适用性，同时说明文章所提相关算法也可用于其他类似有自适应要求的系统中

Preparation and Properties of SnCl_2-MgO-P_2O_5 Sealing Glasses

在还原气氛中熔制了SnCl2-MgO-P2O5系统无铅封接玻璃;用X射线衍射分析(Xrd)、差热分析(dTA)、红外光谱分析(fT-Ir)、热膨胀分析、粉末失重法等研究了玻璃形成区、玻璃结构、特征温度(转变温度Tg和软化温度Tf)、热膨胀系数、耐水侵蚀性等。结果表明,实验制得了一系列特征温度较低的玻璃样品,通过分析样品的dTA曲线,得到了一较低的Tg,其值为231℃;fT-Ir图分析结果证明了玻璃结构的存在,但Xrd图分析结果显示该玻璃易结晶。玻璃样品的Tf随SnCl2/(SnCl2+P2O5)的摩尔比值的增加而下降,随MgO含量的增加而升高。MgO能有效提高玻璃样品的耐水侵蚀性、降低玻璃的晶化能力,但玻璃样品的耐水侵蚀性还未能达到封接要求。Lead-free sealing glasses in the SnCl2-MgO-P2O5 system were prepared in reducing atmosphere.The glass-forming region, structure, characteristic temperature(transition temperature Tg and softening temperature Tf), coefficient of thermal expansion,as well as the water erosion of the glasses were investigated by XRD analysis, differential thermal analysis, Fourier transform infrared spectroscopic analysis, thermal expansion analysis, and grain mass loss method.The results show that a series of glass samples were prepared with a low characteristic temperature.The DTA curve shows a low Tg of a sample at 231℃.The FT-IR spectra indicate the glass structure of the sample, but the XRD pattern shows that the glass tends to crystallize.With the molar ratio of SnCl2 /(SnCl2 +P2O5) increases, the Tf of the glasses decreases, whereas the Tf increases with the increasing of the content of MgO.Meanwhile, with the addition of MgO, the crystallization ability and of the glasses decrease, and the water erosion resistance of the glasses is improved which still can not meet the minimum requirement for stealing.中国国家重点基础研究发展计划(编号:2012CB933103