Versatile and controlled quantum teleportation network

A quantum teleportation network involving multiple users is essential for future quantum internet.So far,controlled quantum teleportation has been demonstrated in a three-user network.However,versatile and controlled quantum teleportation network involving more users is in demand,which satisfies different combinations of users for practical requirements.Here we propose a highly versatile and controlled teleportation network that can switch among various combinations of different users.We use a single continuous-variable six-partite Greenberger-Horne-Zeilinger(GHZ)state to realize such a task by choosing the different measurement and feedback operations.The controlled teleportation network,which includes one sub-network,two sub-networks and three sub-networks,can be realized for different application of user combinations.Furthermore,the coherent feedback control(CFC)can manipulate and improve the teleportation performance.Our approach is flexible and scalable,and would provide a versatile platform for demonstrations of complex quantum communication and quantum computing protocols.

四川大白菜细菌性软腐病新病原菌Pectobacterium versatile的鉴定

为明确引起四川理县大白菜软腐病的病原菌种类,从理县梭罗沟村田间采集具有典型软腐症状的大白菜病样,采用组织分离、致病力测定、生理生化分析、形态学和分子生物学方法进行鉴定。结果表明,分离获得的5株细菌在NA培养基上形成的菌落呈圆形、半透明、乳白色、中心突起、边缘平滑,在半选择性培养基CVP上培养48 h后产生凹陷。5株菌均能使大白菜、胡萝卜、马铃薯和芹菜的离体组织腐烂,接种于白菜苗后叶片呈湿腐萎蔫症状。通过大白菜叶柄接种部位形成的病斑长径来比较菌株致病力强弱,各菌株的致病力有显著差异。基于看家基因pgi、rpoS、mdh、proA、mtlD和icdA(NCBI登录号为OL963562~OL963571)的多基因联合系统发育树,分离菌株与Pectobacterium versatile聚为一簇,dnaX-leuS-recA(NCBI登录号为OL963572~OL963576)的多位点序列分析(MLSA)进一步支持以上结果,且准确性更高。分离菌株的生理生化特征与P.versatile模式菌株一致,综上将其鉴定为P.versatile。这是我国首次报道P.versatile引起大白菜软腐病。

Purification and Characterization of a Versatile Peroxidase from Edible Mushroom Pleurotus eryngii

A versatile peroxidase (VP-Peco60-7 ) was generated and purified from the liquid culture of Pleurotus eryngii. The purification procedure included ammonium sulfate precipitation, ion exchange chromatography, and gel chromatography. The molecular weight and isoelectric point (pI) of VP-Peco60-7 were determined to be approxi-mately 40 kDa and 4.1, respectively. By N-terminal sequence determination and peptide mapping analysis, VP-Peco60-7 was found to be similar to the versatile peroxidase isoenzyme VPL1, which was previously isolated from liquid cultures of the same species. However, the molecular weight and pI of VP-Peco60-7 were different from those of versatile peroxidases of liquid cultures, implying that the VP-Peco60-7 in this study is of a novel type. With 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) as a substrate, the maximal enzyme activity was obtained at 50 °C and pH 3.0. The catalysis of ABTS by VP-Peco60-7 was expressed by the Michaelis-Menten equa-tion. At 50 °C and pH 3.0, the maximum velocity (V max ) was 188.68 U·mg-1 and the michaelis constant (K m ) was 203.09 μmol·L-1 .

A versatile nano-TiO_(2) decorated gel separator with derived multi-scale nanofibers towards dendrite-blocking and polysulfide-inhibiting lithium-metal batteries

In this study,a versatile fluorine-bearing gel membrane with multi-scale nanofibers was rationally designed and synthesized via facile one-step blend electrospinning of nano-titanium dioxide(TiO_(2))particles and fluorinated poly-m-phenyleneisophthalamide(PMIA)polymer solution.The prepared multiscale TiO_(2)-assisted gel separator presented relatively high porosity,small aperture,giving rise to superior affinity to electrolyte and sufficient active sites to accelerate lithium ions migration.Meanwhile,the asfabricated multifunctional GPE also rendered outstanding heat-resistance and well-distributed lithiumions flux,and the mutual overlaps between the coarse fibers and the fine fibers within the multi-scale nanofiber membrane provided a strong skeleton support,which in turn laid a solid footing stone for high-security and dendrite-proof batteries.Particularly,the nano-TiO_(2) particles within PMIA membrane acted as"gatekeepers",which can not only resist the growth of lithium dendrites,but also intercept the dissolved polysulfide on cathode side.Based on these merits,the gel PMIA-based lithium cobalt(LCO)/lithium battery obtained the remarkably improved rate capability and cycle performances on account of superior ionic conductivity,steady anodic stability window and weakened polarization behavior.Meanwhile,the resultant lithium-sulfur cell also delivered the outstanding cycling stability with the aid of the greatly prevented"shuttle effect"of dissolved lithium polysulfides based on the physical trapping and chemical binding of the prepared GPE to polysulfides species.This work proved that the addition of functional inorganic nanoparticles similar with TiO_(2) in multi-scale gel PMIA membrane can enhance the lithium ions transport capability,resist the growth of lithium dendrites as well as inhibit the shuttle effect of polysulfides,which would prompt a great development for dendrite-blocking and polysulfideinhibiting lithium-metal cells.

Theoretical derivation and simulation of a versatile electrostatic trap for cold polar molecules

We propose a versatile electrostatic trap scheme using several charged spherical electrodes and a bias electric held.We hrst give the two-ball scheme and derive the analytical solution of the electric held.In order to make a comparison,we also give the numerical solution calculated by the hnite element software（Ansoft Maxwell）.Considering the loading of cold polar molecules into the trap,we give the three-ball scheme.We hrst give the analytical and numerical solutions of the distribution of the electric held.Then we simulate the dynamic process of the loading and trapping cold molecules using the classical Monte Carlo method.We analyze the influence of the velocity of the incident molecular beam and the loading time on the loading efficiency.After that,we give the temperature of the trapped cold molecules.Our study shows that the loading efficiency can reach 82%,and the corresponding temperature of the trapped molecules is about 24.6 mK.At last,we show that the single well divides into two ones by increasing the bias electric held or decreasing the voltages applied to the spherical electrodes.

High Speed Versatile Reed-Solomon Decoder for Correcting Errors and Erasures

A new Chien search method for shortened Reed-Solomon （RS） code is proposed, based on this, a versatile RS decoder for correcting both errors and erasures is designed. Compared with the traditional RS decoder, the weighted coefficient of the Chien search method is calculated sequentially through the three pipelined stages of the decoder. And therefore, the computation of the errata locator polynomial and errata evaluator polynomial needs to be modified. The versatile RS decoder with minimum distance 21 has been synthesized in the Xilinx Virtex-Ⅱ series field programmable gate array （FPGA） xe2v1000-5 and is used by coneatenated coding system for satellite communication. Results show that the maximum data processing rate can be up to 1.3 Gbit/s.

Cultivating Versatile Foreign Language Talents for China——Exclusive interview with Wang Zonghu,Dean of the School of Foreign Languages of Capital Normal University

When entering the School of Foreign Languages of Capital Normal University,you can sense the strong academic and teaching atmosphere.As for talent cultivation,Wang Zonghu,Dean of the School of Foreign Languages of Capital Normal University has quite clear objectives:“I hope to cultivate versatile talents with profound cultural connotation,adequate knowledge of history,culture,politics,economy,military and foreign affairs,international view and patriotism.”

A versatile cloning vector facilitates target geneexpression in prokaryotic and eukaryotic cells

Objective: To facilitate manipulation of gene expression in different host cells, we used pEGFP-N1 as backbone to construct a versatile vector that can drive foreign gene expression in prokaryotic and eukaryotic cells. Methods: A cloning and expression vector, pEGFP-N1-lac, was constructed by inserting the prokaryotic lac promoter of pUC19 into the eukaryotic expression vector, pEGFP-N1, between the eukaryotic PCMV promoter and enhanced green fluorescent protein (EGFP) open reading frames. To assess the function of pEGFP-N1-lac, the nucleotide sequence encoding the hepatitis C virus (HCV) core protein was cloned into the multiple cloning sites. Western blotting analysis was used to detect the expression of the HCV core protein in Escherichia coli DH5α and HepG2 cells. Results: Restriction enzymedigestion and sequence analysis indicated that pEGFP-N1-lac was successfully constructed and the HCV core gene was cloned into this vector. The Western blotting results showed that pEGFP-N1-lac promoted expression of HCV core gene in prokaryotic E. coli DH5α and eukaryotic HepG2 cells. Conclusion: The pEGFP-N1-lac vector has been successfully constructed and functions in both prokaryotic and eukaryotic cells. The EGFP reporter can be used as an insert-inactivation marker for clone selection or as an expression tag. This vector can be used for cloning and expression of genes in both prokaryotic and eukaryotic cells, making gene cloning, expression and functional studies convenient as well as time- and labor-efficient.

Versatile Plastic Bottles Blowing Machine

The versatile plastic bottle blowing machine, developed and produced by the Anhui Tongda Science and Technology Development Corp. under the Sino-foreign joint venture Guobao Group, has been exported to Britain, Iceland, Paraguay, Thailand, Pakistan, Bangladesh and the Commonwealth of Independent States. At an

面向打赢信息化战争的军队密码管理复合型人才培养

从岗位能力、知识结构和素质要求三方面分析了军队密码管理人才“军政技合一,多学科兼顾”的复合性特点,提出了新时代军队密码管理人才培养理念,从三维立体交叉的本科专业课程体系、多学科知识融合的专业系列教材、符合创新和实战要求的专业实践环境以及多层次密码管理人才培养体系等方面探索了密码管理复合型人才培养的有效举措。

面向360°全景视频的帧内预测编码的快速算法

为了节省360°全景视频的编码时间,对通用视频编码标准中的编码单元划分决策过程进行了研究,提出了一种面向360°全景视频的帧内预测编码的快速算法。通过优化编码树单元(Coding Tree Unit,CTU)的编码深度范围和编码单元的划分模式的选择过程,减少编码时间。实验结果表明,在全帧内模式下,所提算法比原始算法平均可以节省34.33%的时间复杂度,同时带来的BDBR平均增量仅为1.665%,BDPSNR的平均降低量仅为0.076 dB。

基于虚拟教研室的高校人工智能专业(AI+X方向)建设——以浙江大学为例

随着人工智能技术的快速发展和新兴职业的不断涌现,社会对复合型人工智能人才的需求日益迫切。高等院校亟需创新教学组织形式,促进教学资源共享与学科交叉融合。为此,各级教育部门积极推进虚拟教研室建设,探索人工智能专业建设新模式,产生了一系列优秀案例。基于此,文章以浙江大学人工智能专业(AI+X方向)虚拟教研室为例,深入剖析其建设经验与启示。研究发现,浙江大学以知识点为核心组织教学资源,通过创新微专业与微认证、研发特色教材与课程资源、搭建科教实训平台、组织开展师资培训等方式,有效促进了人工智能与多学科交叉融合,实现了优质教学资源的整合与共享,为复合型人工智能人才培养提供了有力支撑。文章的研究对于推动虚拟教研室建设具有重要意义,并可为高校人工智能专业建设和人才培养提供参考。

新型夹层结构研究进展

未来对重型运载火箭的需求日益迫切,在总载荷一定的情况下,携带货物重量提升,必定要降低火箭本体的重量,这就对现有的材料和结构提出了更高的要求。不以牺牲强度和功能性为代价,如何提升材料的有效载荷比成为重要挑战。目前最常见并且高效的方法,是通过设计和制备各种新型夹层结构,同时满足轻质、高强以及具备功能性的要求。本文总结了近些年来国内外夹层结构的研究进展,详细介绍了几种主要夹层结构的结构基础与特点,以及其各自的力学性能及多样的功能性,并提出了对我国夹层结构领域研究发展的建议。

集成波前转换与极化转换功能的低散射超表面设计

针对复杂电磁环境中的多功能微波复合材料设计问题,提出了一种兼具通带内波前转换与极化转换以及通带外雷达散射截面减缩功能的超表面设计。超表面在两个正交的横向方向上维持相同的透射相位梯度以及固定的π/2透射相位差异,以实现具有平面波前的圆极化电磁波与具有球面波前的线极化电磁波之间的互易转换。同时,通过级联频率选择有耗层构造了电路模拟吸波结构,以使超表面在透波窗口外的雷达散射截面得到有效减缩。进一步,由一副线极化渐变缝天线单元作为置于球面波相位中心处的初级辐射源,在透射后的主瓣方向上宽频范围内观察到了具有增强增益和圆极化特性的次级辐射,增益增强带宽为57.14%,主瓣方向3 dB轴比带宽为35.50%。在透波窗口外的低频端,不低于10 dB的雷达散射截面减缩带宽可达113.12%且该减缩效果具有良好的斜入射稳定性。实测结果和全波仿真结果的良好吻合验证了该设计的有效性。

基于CU特征差异的VVC帧内快速划分算法

针对通用视频编码(versatile video coding,VVC)在编码单元(coding unit,CU)划分中引入了多类型树划分结构导致编码复杂度增加的问题,提出了一种基于CU子块方向特性与空间复杂度的快速划分算法。首先利用CU整体的纹理复杂度对当前CU进行分类,筛选出不划分CU;然后利用子块不同划分方向的特性差异提前决策CU划分方向;最后利用CU中间区域与边缘区域的复杂度差异特征判断是否跳过三叉树(ternary tree,TT)划分,进一步减少候选列表划分模式数量。实验结果表明,与官方测试平台VTM10.0相比,编码器在平均输出比特率增加1.12%的代价下,编码时间减少了40.25%,说明该算法在通用视频编码中能以较小的质量损失实现更短的编码时间。

新型电力系统的全能型静止同步机优化配置

提出一种用于提升频率和静态电压稳定性的全能型静止同步机优化配置方法。首先,推导出频率稳定的约束解析表达式,并基于奇异值理论建立系统静态电压稳定约束,建立考虑频率和静态电压稳定约束的全能型静止同步机优化配置模型;然后,将全能型静止同步机优化配置模型分解为选址定容主问题和稳定裕度计算子问题,通过主问题和子问题的交替求解实现最优解的近似逼近;最后,在一个修改的IEEE 39节点系统中进行测试,验证了所提方法的有效性。

色度域亮度域信息融合的监控视频重压缩取证

为解决当前视频重压缩取证方法没有考虑色度域信息、取证准确度低的问题,提出一种面向最新多用途视频编码(versatile video coding,VVC)标准色度域亮度域信息融合的监控视频重压缩取证方法(CLF-SVRF)。基于VVC标准的编码原理,从监控视频的色度域和亮度域维度分析并确定VVC视频码流中与压缩次数密切相关的基础码流特征;基础码流特征包括色度域和亮度域编码单元(coding unit,CU)的划分类型及预测模式;结合拉格朗日率失真优化技术分析随着压缩次数的增加,色度域亮度域CU划分类型和预测模式的变化;进一步确定色度域亮度域CU划分类型和预测模式可以作为检测视频压缩次数的基础码流特征;接着考虑视频监控应用对重压缩取证方法低复杂度的需求,基于色度域亮度域CU划分类型和预测模式构建低复杂度高级码流特征;将高级码流特征输入支持向量机完成监控视频的重压缩取证。实验结果表明,与当前先进方法相比,CLF-SVRF方法的监控视频重压缩取证准确度平均提升了13.53%,同时可以大幅度地降低重压缩取证耗时,重压缩取证时间平均减少了47.42%。

应用型高校英语专业教学改革研究

应用型高校英语专业教学改革,对于英语专业的发展、应用型高校人才培养、英语教学理论与实践研究都具有重要意义。当前,应用型高校英语专业教学存在跨学科知识体系缺乏、教学内容单一、教学形式不具吸引力、信息化教学工具使用不充分等问题。应用型高校英语专业教学改革的路径是:明确教学目标、深挖教材内涵、重构教学模式、优化评价方式、创设第二课堂。