New ordered MAX phase Mo_2 TiAlC_2: Elastic and electronic properties from first-principles

First-principles computation on the basis of density functional theory(DFT) is executed with the CASTEP code to explore the structural, elastic, and electronic properties along with Debye temperature and theoretical Vickers’ hardness of newly discovered ordered MAX phase carbide Mo2TiAlC2. The computed structural parameters are very reasonable compared with the experimental results. The mechanical stability is verified by using the computed elastic constants. The brittleness of the compound is indicated by both the Poisson’s and Pugh’s ratios. The new MAX phase is capable of resisting the pressure and tension and also has the clear directional bonding between atoms. The compound shows significant elastic anisotropy. The Debye temperature estimated from elastic moduli(B, G) is found to be 413.6 K. The electronic structure indicates that the bonding nature of Mo2TiAlC2is a mixture of covalent and metallic with few ionic characters. The electron charge density map shows a strong directional Mo–C–Mo covalent bonding associated with a relatively weak Ti–C bond.The calculated Fermi surface is due to the low-dispersive Mo 4d-like bands, which makes the compound a conductive one.The hardness of the compound is also evaluated and a high value of 9.01 GPa is an indication of its strong covalent bonding.

Evolution of freshwater Diaporthomycetidae(Sordariomycetes)provides evidence for five new orders and six new families

Cancellidium is a remarkable fungal genus which has been collected from wood submerged in freshwater and has unique conidia that are important in dispersal in running streams.With such a remarkable morphology,one would have expected it to be a distinct family or order.However,due to the dearth of molecular evidence in related taxa,this genus has previ-ously been placed in the order Hypocreales,subclass Hypocreomycetidae of Sordariomycetes.In this study,we made three new collections of this remarkable aquatic genus from streams in China and Thailand,isolated them into culture,extracted DNA and carried out multigene phylogenetic analysis and divergence time estimation which placed the genus in Diaporthomycetidae.This is one of the seven subclasses of Sordariomycetes and contains 30 lineages that are only known from freshwater.The subclass is therefore of interest when considering the evolution of freshwater fungi.Several lineages of Diaporthomycetidae are morphologically unique and taxa cluster with strong support,but have weak support at the base of the trees.The phylogenetic and MCC trees generated in this study indicate that Aquapteridospora,Barbatosphaeriaceae,Bullimyces,Cancellidium,Ceratolenta,Conlarium,Phialemoniopsis,Pseudostanjehughesia and Rhamphoriaceae are distinct genera/families that evolved in the family/order time frame.The new orders Barbatosphaeriales(177 MYA),Cancellidiales(137 MYA),Ceratolentales(147 MYA),Conlariales(138 MYA)and Rhamphoriales(133 MYA)and six new families,Aquapteridosporaceae(110 MYA),Cancellidiaceae(137 MYA),Ceratolentaceae(81 MYA),Bullimycetaceae(81 MYA),Phialemoniopsaceae(59 MYA),and Pseudostanjehughesiaceae(111 MYA)are introduced with evidence from phylogenies,divergence estimates and distinct morphologies.Of these families,Aquapteridosporaceae,Cancellidiaceae,Bullimycetaceae,and Pseudostanjehughesiaceae are only known from freshwater.

A new ordered phase forming during ageing in Cu-Ti alloys

AGE-hardened Cu-Ti has been an important alloy of investigation in the field of continuousphase transformation due to its complicated transformation processes which involve short rangeordering (SRO), spinodal decomposition (SD), long range ordering (LRO), etc. So far, ithas been a controversial topic whether each process exists, and in what sequence they pro-ceed.

A NEW WAY FOR DERIVING HIGH ORDER STOKES WAVES

Variational principle for non-vortex, non-linear wave theories is established in this paper. By using this variational principle and related functional minimum condition, the fifth and sixth order Stokes Vaves are given as an example and the results are compared with those in Reference (Skjel-breia, 1961).

The Struggle for Establishing A New International Order

The 20th century is a century when both intra-national order and internationalorder were frequently changing. The struggles have never stopped focusingon setting order. Today with the East-west cold war over for 10 years, there arestill strong appeals for peace and stability, and demands for establishing a newinternational order. The War on Kosovo in the end of the 20th century is a sig-nificant attempt from the U. S. and other major Western powers to set up a newworld order without caring whether by means of force or even of war. This

The UN and a New World Order

CURRENTLY, the world is undergoing significant change as emerging powers become more important and active participants in the international system. Significant changes in the relative economic and political power of states pose new challenges and opportunities for international peace and development,

Mei symmetry and new conserved quantities of Tzénoff equations for higher-order nonholonomic system

In this paper,the Mei symmetry of Tzénoff equations for the higher-order nonholonomic system and the new conserved quantities derived from that are researched,and the function expression of new conserved quantities and criterion equation which deduces these conserved quantities are presented.This result establishes the theory basis for further researches on conservation laws of Tzénoff equations of the higher-order nonholonomic constraint system.

构建人类命运共同体的时代价值与实践指向

构建人类命运共同体是中国共产党对人类发展前景和全球治理体系作出的前瞻性考量。这一理念蕴含着中华优秀传统文化中的“共同体”思想,体现了马克思主义政党的使命担当,传承了马克思主义发展观,推动构建世界发展新秩序、世界文明新秩序,推进全球治理体系变革,遵循对话协商、共建共享、合作共赢、交流互鉴、绿色低碳的原则,彰显了中国特色大国外交理念,具有重要时代价值和实践指导意义,为全球治理提供中国智慧和中国方案。

中国制造业高质量发展的评价与分析

采用新改进的熵权-TOPSIS(优劣解距离法)模型对2012—2020年中国制造业高质量发展水平进行测度,并对各维度进行分析,总结制造业高质量发展的时序演变特征。运用空间分析方法对空间分布特征及其演变趋势进行研究,并借助泰尔指数及其分解法,对制造业高质量发展的区域差距进行分解分析。结果表明:中国制造业高质量发展总体水平呈上升趋势,在区域上呈现出东部、中部、西部、东北部依次递减的特点,从稳定性来看,中部地区最为稳定,其次是东北、西部地区,最后是东部地区;从空间演变分析来看,存在一定的空间集聚性;从区域差距来看,制造业高质量发展水平总体差距呈现先增后降趋势,有缩小趋势,区内差异是主要区域差异来源,并且东部地区是区内差异的主要贡献地区。

Adaptive synchronisation of fractional-order chaotic systems

A new stability theory of nonlinear dynamic systems is proposed, and a novel adaptive synchronisation method is presented for fractional-order chaotic and hyperchaotic systems based on the theory described in this paper. In comparison with previous methods, not only is the present control scheme simple but also it employs only one control strength, converges very fast, and it is also suitable for a large class of fractional-order chaotic and hyperchaotic systems. Moreover, this scheme is analytical and simple to implement in practice. Numerical and circuit simulations are used to validate and demonstrate the effectiveness of the method.

A Look at The Syllabus of New Headway Intermediate Students' book and Its Implementation on Chinese Middle School Students

The purpose of this assignment is to evaluate the course book New Headway intermediate students’book.The teaching context of using this book will be described clearly before discussing the syllabus terms and types which are related to the course book.In addition,the selection and ordering of elements in this course book will be analyzed,the problems and solutions of using this book in teaching context will also be discussed.

习近平法治思想中的“大变局”应对方略论

“大变局”应对方略是习近平法治思想立足于“百年未有之大变局”的科学论断,针对积极应对世界大变局的现实需要所彰显之实效导向型共识。其作为一种凸显执行性遵守之行动整合的共同准则与依据,往往围绕建立健全涉外法治体系和营造国际法治新秩序这两种应对方略而具体展开。法治体系应对方略主要表征为建立健全涉外法治体系的原则表达、目标设定与核心要素,法治秩序应对方略则主要表征为营造国际法治新秩序的目标设定、方案要义与路径导向。基于此,全面梳理习近平法治思想中的“大变局”应对方略样态,能够为涉外法治工作的有效推动提供系统的类型化指引。

不结盟运动构建印度洋和平区的过程、困境与内涵(1964—1980)

二战后,随着英国影响力在印度洋地区逐渐收缩,美苏两个超级大国在印度洋区域扩大势力范围,对印度洋沿岸及区域内国家造成了安全威胁。万隆会议召开后,印度洋沿岸及区域内国家开始利用不结盟运动这一平台向联合国建议构建印度洋和平区,这一提议在1971年被联合国通过。对比二战后两大超级大国主导的对第三世界不公正的世界秩序,印度洋和平区的倡议体现了区域内国家对构建以独立、自主、和平、合作等理念为核心的新世界秩序的向往与尝试。然而,印度的地区霸权主义行径与美苏两国在撤出军事基地与海军等方面并不进行实质性对话,使印度洋和平区决议难以落实。印度洋和平区的主张是在美苏两大超级大国进行全球性对抗时,第三世界国家率先发出的对于和平、稳定等秩序的追求,为世界和平发展增加了更多可能性和正能量,直至今日全球南方国家对这一进程的奋斗仍在继续。

带新订单插入的虚拟制造单元重构方法研究

虚拟制造单元旨在更改物流走向和优化制造单元,提高车间生产效率和物流柔性,广泛存在于多品种小批量生产车间。随着新订单插入,产品类型与工艺路径不断变化,原有虚拟制造单元易引起设备负载不均衡和生产效率下降。针对新订单插入情形,引入连续相同工序,设计一种新的衡量新订单与原有虚拟制造单元的相似度指标;针对虚拟制造单元重构情形,建立以设备负载均衡、总运输成本、跨单元次数和单元继承率为优化目标的虚拟制造单元重构数学模型。另外,对基于分解的多目标进化算法(multi-objective evolutionary algorithm based on decom-position,MOEA/D)进行改进,采用多种交叉算子提高全局搜索效率,采用基于模拟退火的邻域搜索提高局部探寻能力。最后,以某企业机加工车间实际案例和10组标杆案例,验证了所提方法的有效性和卓越性,为虚拟制造单元重构决策提供理论参考依据。

农村新生代青年低额彩礼的形成机制及其现实挑战

高额彩礼是我国近年来重点治理的突出社会问题。本研究基于对重庆石村新生代青年“零彩礼”现象的田野调查,分析当地低额彩礼的形成机制及其面临的现实挑战。石村“不算彩礼”的共识促进了婚姻交换灵活多元的发展,相对于更具仪式性的婚礼花费、改口费和房产花费,彩礼因过于货币化和功利化而被排除在有意义的婚姻交换之外。自明清流传至今的传统习俗和社会主义新风尚共同塑造了当地礼俗传统,弱代际责任感下自由恋爱、代际和性别平等的情境化解了婚姻交换的偿付和资助功能,礼物模式的婚姻交换在仪式和日常中塑造着集体道德感,即使是在跨婚姻圈的新生代中也没有形成高额彩礼。但随着社会流动性和风险性增大,当地低额彩礼实践的维系正面临着跨区域文化冲突和彩礼抵押功能强化的挑战。

A new two-mode thermo- and squeezing-mixed optical field

We propose a new two-mode thermo-and squeezing-mixed optical field, described by the new density operator ρ=1-e^f-｜g｜^2 e^ga^＋b^＋e^fa^＋a｜0〉 f_（bb） 〈0｜ e^（g＊ab）, where ｜0〉_（bb） 〈0｜ is the b-mode vacuum, e ^fa^＋arepresents the thermo-field, and e^ga^＋b^＋ indicates squeezing. The photon statistics for ρ is studied by virtue of the method of integration within ordered product（IWOP） of operators. Such a field can be generated when a two-mode squeezed state passes through a one-mode dissipation channel.

Higher Order Solitary Wave Solutions of the Standard KdV Equations

Considered under their standard form, the fifth-order KdV equations are a sort of reading table on which new prototypes of higher order solitary waves residing there, have been uncovered and revealed to broad daylight. The mathematical tool that made it possible to explore and analyze this equation is the Bogning-Djeumen Tchaho-Kofané method extended to the new implicit Bogning' functions. The analytical form of the solutions chosen in this manuscript is particular in the sense that it contains within its bosom, a package of solitary waves made up of three solitons, especially, the bright type soliton, the hybrid soliton and the dark type soliton which we estimate capable in their interactions of generating new hybrid or multi-form solitons. Existence conditions of the obtained solitons have been determined. It emerges that, these existence conditions of the chosen ansatz could open the way to other new varieties of fifth-order KdV equations including to which it will be one of the solutions. Some of the obtained solitons are exact solutions. Intense numerical simulations highlighted numerical stability and confirmed the hybrid character of the obtained solutions. These results will help to model new nonlinear wave phenomena, in plasma media and in fluid dynamics, especially, on the shallow water surface.

邓小平对中国特色大国外交的理论贡献

邓小平是党的第二代领导集体的核心,是伟大的马克思主义战略家。他统揽国内和国际两个大局,纵观世界大势,深刻洞察和分析国际形势的新变化和世界格局演变的新特点,高瞻远瞩,深谋远虑,提出一系列重大外交战略新判断新思想,果断调整了我国对外政策,开创了中国外交新局面,赢得了有利的改革开放和社会主义现代化建设的国际环境,树立了反对霸权主义、促进世界和平与发展的光辉的国际形象。认真学习邓小平的外交战略思想,对我们推进新时代中国特色大国外交具有十分重要的意义。

Some applications of a new coherent-entangled state in two-mode Fock space

Using the technique of integration within an ordered product of operators, we find a new kind of coherent-entangled state （CES）, which exhibits both coherent and entangled state properties. The set of CESs makes up a complete and partly nonorthogonal representation. Using a beam splitter, we propose a simple experimental scheme to produce the CES. Finally~ we present some applications of CESs in quantum optics.

特大城市新市民社会融入情况及相关因素研究——以上海市为例

为探索特大城市中新市民社会融入的情况,收集并分析了269份上海市新市民调查问卷的数据。研究结合各项指标统计各样本的社会融入水平,并通过有序Probit回归模型分析影响因素。实证结果表明,在个体特征方面,年龄与融入程度无显著正相关,且相比新市民原籍所在的区域,当前持有上海户籍与否对其社会融入的影响更为显著;在个人能力方面,新市民的社会融入情况与收入和学历呈正相关,与职业属性的关联较小;在住房状况方面,居住模式对融入的影响最为显著。最后,基于分析结果,从提升住房保障与购房优惠、鼓励在职再学、简化落户政策等角度提出建议。