Relationship between the unique microstructures and behaviors of high-entropy alloys

High-entropy alloys(HEAs),which were introduced as a pioneering concept in 2004,have captured the keen interest of nu-merous researchers.Entropy,in this context,can be perceived as representing disorder and randomness.By contrast,elemental composi-tions within alloy systems occupy specific structural sites in space,a concept referred to as structure.In accordance with Shannon entropy,structure is analogous to information.Generally,the arrangement of atoms within a material,termed its structure,plays a pivotal role in dictating its properties.In addition to expanding the array of options for alloy composites,HEAs afford ample opportunities for diverse structural designs.The profound influence of distinct structural features on the exceptional behaviors of alloys is underscored by numer-ous examples.These features include remarkably high fracture strength with excellent ductility,antiballistic capability,exceptional radi-ation resistance,and corrosion resistance.In this paper,we delve into various unique material structures and properties while elucidating the intricate relationship between structure and performance.

GLOBAL UNIQUE SOLUTIONS FOR THE INCOMPRESSIBLE MHD EQUATIONS WITH VARIABLE DENSITY AND ELECTRICAL CONDUCTIVITY

We study the global unique solutions to the 2-D inhomogeneous incompressible MHD equations,with the initial data(u0,B0)being located in the critical Besov space■and the initial densityρ0 being close to a positive constant.By using weighted global estimates,maximal regularity estimates in the Lorentz space for the Stokes system,and the Lagrangian approach,we show that the 2-D MHD equations have a unique global solution.

WEAK-STRONG UNIQUENESS FOR THREE DIMENSIONAL INCOMPRESSIBLE ACTIVE LIQUID CRYSTALS

The hydrodynamics of active liquid crystal models has attracted much attention in recent years due to many applications of these models.In this paper,we study the weak-strong uniqueness for the Leray-Hopf type weak solutions to the incompressible active liquid crystals in R^(3).Our results yield that if there exists a strong solution,then it is unique among the Leray-Hopf type weak solutions associated with the same initial data.

Local existence and uniqueness of solutions to the evolutionary model for magnetoviscoelasticity

In this paper,we prove the local existence and uniqueness of solutions to the evolutionary model for magnetoviscoelasticity in R^(2),R^(3).This model consists of an incompressible Navier-Stokes,a regularized system for the evolution of the deformation gradient and the Landau-Lifshitz-Gilbert system for the dynamics of the mag-netization.Our approach depends on approximating the system with a sequence of perturbed systems.

UNIQUENESS, ERGODICITY AND UNIDIMENSIONALITY OF INVARIANT MEASURES UNDER A MARKOV OPERATOR

Let X be a compact metric space and C（X） be the space of all continuous functions on X. In this article, the authors consider the Markov operator T ： C（X）N C（X）N defined by for any f = （f1,f2,… ,fN）, where （pij） is a N x N transition probability matrix and {wij } is an family of continuous transformations on X. The authors study the uniqueness, ergodicity and unidimensionality of T＊-invariant measures where T＊ is the adjoint operator of T.

THE REGULARITY AND UNIQUENESS OF A GLOBAL SOLUTION TO THE ISENTROPIC NAVIER-STOKES EQUATION WITH ROUGH INITIAL DATA

A global weak solution to the isentropic Navier-Stokes equation with initial data around a constant state in the L^(1)∩BV class was constructed in[1].In the current paper,we will continue to study the uniqueness and regularity of the constructed solution.The key ingredients are the Holder continuity estimates of the heat kernel in both spatial and time variables.With these finer estimates,we obtain higher order regularity of the constructed solution to Navier-Stokes equation,so that all of the derivatives in the equation of conservative form are in the strong sense.Moreover,this regularity also allows us to identify a function space such that the stability of the solutions can be established there,which eventually implies the uniqueness.

UNIQUENESS OF INVERSE TRANSMISSION SCATTERING WITH A CONDUCTIVE BOUNDARY CONDITION BY PHASELESS FAR FIELD PATTERN

In this paper,we establish the unique determination result for inverse acoustic scattering of a penetrable obstacle with a general conductive boundary condition by using phaseless far field data at a fixed frequency.It is well-known that the modulus of the far field pattern is invariant under translations of the scattering obstacle if only one plane wave is used as the incident field,so it is impossible to reconstruct the location of the underlying scatterers.Based on some new research results on the impenetrable obstacle and inhomogeneous isotropic medium,we consider different types of superpositions of incident waves to break the translation invariance property.

Uniqueness of Viscosity Solutions to the Dirichlet Problem Involving Infinity Laplacian

In this paper, we study the Dirichlet boundary value problem involving the highly degenerate and h-homogeneous quasilinear operator associated with the infinity Laplacian, where the right hand side term is and the boundary value is . First, we establish the comparison principle by the double variables method based on the viscosity solutions theory for the general equation in. We propose two different conditions for the right hand side and get the comparison principle results under different conditions by making different perturbations. Then, we obtain the uniqueness of the viscosity solution to the Dirichlet boundary value problem by the comparison principle. Moreover, we establish the local Lipschitz continuity of the viscosity solution.

Understanding the superior mechanical properties of Mg-3Al-Zn alloy sheets:Role of multi-type unique textures

Mg-3Al-1Zn(AZ31)sheets were produced by transverse gradient extrusion(TGE)process.The flow behavior and dynamic recrystallization during extrusion were systematically analyzed.The microstructures,textures,and mechanical behavior of extruded AZ31 sheet were also analyzed and compared with conventional extruded(CE)sheet.The results showed that fine grain structure and multi-type unique textures were formed in TGE sheet because of the generation of extra flow velocity along transverse direction(TD)and flow velocity gradient along extrusion direction(ED)during extrusion.The basal poles gradually deviated away normal direction(ND)from edge to center of the TGE sheet along TD,and the largest inclination angle at center region reached around 65°.Furthermore,the basal poles inclined from ED to TD 40°-63°,except for the center region of TGE sheet.The TGE sheet presented higher ductility and strain hardening exponent(n-value),but lower yield strength and Lankford value(r-value)in comparison with the CE sheet.Both the basal<a>slip and tensile twins were easy to be activated during deformation,and the largest elongation of 41%and the lowest yield strength of 86.5 MPa were obtained for the ED-center sample in the TGE sheet.

Existence and Uniqueness Results for a Fully Third-Order Boundary Value Problem

The boundary value problems of the third-order ordinary differential equation have many practical application backgrounds and their some special cases have been studied by many authors. However, few scholars have studied the boundary value problems of the complete third-order differential equations u′′′(t) = f (t,u(t),u′(t),u′′(t)). In this paper, we discuss the existence and uniqueness of solutions and positive solutions of the fully third-order ordinary differential equation on [0,1] with the boundary condition u(0) = u′(1) = u′′(1) = 0. Under some inequality conditions on nonlinearity f some new existence and uniqueness results of solutions and positive solutions are obtained.

Uniquely Decomposable Constellation Group-Based Sparse Vector Coding for Short Packet Communications

Sparse vector coding(SVC)is emerging as a potential technology for short packet communications.To further improve the block error rate(BLER)performance,a uniquely decomposable constellation group-based SVC(UDCG-SVC)is proposed in this article.Additionally,in order to achieve an optimal BLER performance of UDCG-SVC,a problem to optimize the coding gain of UDCG-based superimposed constellation is formulated.Given the energy of rotation constellations in UDCG,this problem is solved by converting it into finding the maximized minimum Euclidean distance of the superimposed constellation.Simulation results demonstrate the validness of our derivation.We also find that the proposed UDCGSVC has better BLER performance compared to other SVC schemes,especially under the high order modulation scenarios.

THE EXISTENCE AND LOCAL UNIQUENESS OF MULTI-PEAK SOLUTIONS TO A CLASS OF KIRCHHOFF TYPE EQUATIONS

In this paper,we study the existence and local uniqueness of multi-peak solutions to the Kirchhoff type equations-(ε^(2)a+εb∫_(R^(3))|■u|^(2))△u+V(x)u=u^(p),u>0 in R^(3),which concentrate at non-degenerate critical points of the potential function V(x),where a,b>0,1<p<5 are constants,andε>0 is a parameter.Applying the Lyapunov-Schmidt reduction method and a local Pohozaev type identity,we establish the existence and local uniqueness results of multi-peak solutions,which concentrate at{a_(i)}1≤i≤k,where{a_(i)}1≤i≤k are non-degenerate critical points of V(x)asε→0.

新疆煤层气大规模高效勘探开发关键技术领域研究进展与突破方向

新疆煤层气资源量7.5万亿m^(3)(2000 m以浅),已施工煤层气井450口,年产气量达到0.8亿m^(3),新疆维吾尔自治区提出了2025年实现煤层气产量25亿m^(3)的目标,煤层气大规模高效开发成为紧迫的重大需求。从煤层气富集模式与选区技术、“甜点”预测探测技术、加速滚动开发与快速增储上产策略、地质适配性开发技术、煤层气与煤炭、油气协同开发技术5个关键技术领域,系统梳理了新疆煤层气勘探开发已取得的主要研究进展,分析提出了可能突破方向。研究表明:新疆煤储层具有多-厚煤层普遍、低阶煤发育、急倾斜煤层多见、煤体变形与构造控制显著、水文条件和露头条件复杂,和三“低”(含气量低、甲烷体积分数低、含气饱和度低)五“高”(高含气强度、高孔隙度、高地应力变化、高储层压力变化、高渗透率变化)的含气性及物性等煤层气地质独特性;煤层气成因与富集模式具有多样性,包括生物成因气、热成因气或生物-热复合成因及其相应富集模式,生物成因气藏或生物成因气贡献普遍;煤层气分布赋存规律呈现前陆盆地、山间盆地显著差异性;创新形成基于“两”分开(浅部与深部,低阶煤与中高阶煤)“两”结合(地质评价与工程评价,多元数据)的科学评价与基于“机器学习+三维地质建模”的精准选区技术是第1个突破方向。深部煤层气/煤系气“甜点”发育区域主要为盆内坳陷的凸起、盆内隆起的凹陷、盆缘斜坡,高产井位多为构造高点,发育层位为割理裂隙发育的原生结构煤层或孔裂隙发育的煤系砂砾岩储层;基于“地球物理+岩石物理+岩石力学地层新方法”和“地质甜点+工程甜点新理念”的深部煤层气/煤系气“甜点”预测探测技术是第2个突破方向。低风险、短周期、高效率、多批次工程部署是加速滚动开发的基本原则;中浅部煤层气快速增储上产技术策略是在优选新区块布井建井、对老区块煤层气井进行增产改造;深部煤层气快速增储上产技术策略是在大型盆地缓坡深部和盆内凸起“甜点”区优先部署开发;科学加速滚动开发与高效快速增储上产的工程部署方法与技术策略是第3个突破方向。在井网井型差异性优化部署、低储层伤害钻井固井、高可靠性录井测井试井、多井型高效分段压裂、低套压-控压排采管控等工程技术取得重要进展;发展构建新疆煤层气大规模高效勘探开发地质适配性技术体系是第4个突破方向。开展先采气后采煤、煤层气与煤共采、煤层气与原位富油煤共采,推动中浅部煤层气与煤炭协同勘探开发;开展煤系叠合型气藏开发、煤层气与煤系气共探共采、煤系全油气系统勘探开发,推动深部煤层气与油气协同勘探开发,已有关注和探索;煤层气与煤、油气共探共采是第5个突破方向。成果试图为新疆煤层气大规模高效勘探开发提供技术支持和工程决策参考。

论中国式现代化蕴含的独特价值观

文艺复兴和启蒙运动开启了人类现代化的应然价值诉求,即倡导坚持以人为本,注重人的价值,实现人的自由、平等和幸福。然而,自工业革命以来,以资本逻辑为主导的西方式现代化始终坚持资本至上的价值理念,崇尚理性至上的价值标准,恪守零和博弈的价值取向,逐渐偏离了现代化价值观的应然指向,造成现代化价值观的现实悖论。与西方式现代化不同,中国式现代化蕴含的独特价值观以富强民主文明和谐美丽、社会主义核心价值观和全人类共同价值为核心要义,在价值维度形成了人民至上的价值立场、共同富裕的价值追求、人与自然和谐共生的价值准则、和平发展的价值取向等基本内涵。因此,中国式现代化蕴含的独特价值观具有人民性、连续性、包容性、和平性等主要特性。中国式现代化蕴含的独特价值观对于引领建设中华民族现代文明、深化人类文明的交流与互鉴、绘就人类现代化新世界图景具有重要的时代意义。

中国式现代化视域下农村土地制度的优势、困境与改革方略

农村土地制度是国家的基础性制度,其变革关系到资源配置、百姓福祉和社会稳定,中国式现代化的发展离不开农村土地制度的支持与保障。回顾中国式现代化发展历程,农村土地制度这一根本性、基础性生产关系的变革与调适,对不同阶段主要发展任务的完成起到了至关重要的作用。在中国式现代化视域下农村土地制度具有五大独特优势,分别是能够在人口规模巨大条件下保障我国的粮食安全和社会稳定,能够以释放土地财产收益为抓手夯实全体农民共同富裕的物质基础,能够以赓续农耕文明、改善乡村公共文化服务为载体支持农村精神文明建设,能够以退耕还林还草还湖工程、发展生态农业、防治耕地污染、农村人居环境整治为路径促进人与自然和谐共生,能够以支撑内生型发展模式为手段保证我国走和平发展道路。面对当前农村土地制度的发展困境,需要进一步深化农村土地制度改革,着力加强农村土地的粮食安全保障、财产性收益提升、精神文明和生态文明建设、社会秩序稳定功能。

解决大党独有难题:党的自我革命的主攻方向

“解决大党独有难题”是中国共产党立足新的历史方位加强全面领导、推进自身建设的重大时代命题,也是党的自我革命的主攻方向。党在回应历史和时代之问,解决每一历史阶段的难题中推进了理论创新、制度完善、事业发展,锻造了强大的马克思主义执政党。新时代解决大党独有难题,必须遵循习近平总书记关于党的自我革命的重要思想,坚持“九个以”的实践要求,进一步健全全面从严治党体系、党的自我革命制度规范体系,始终坚持严的基调,不断增强党的自我净化、自我完善、自我革新、自我提高能力。

大党独有难题的认知逻辑与破解之道

时刻保持解决大党独有难题的清醒和坚定,中国共产党方能行稳致远。党以整体规模大、历史跨度大、志向抱负大等显著性特征展现“大的样子”,大党基于应有的“大的担当”肩负党内治理、国家治理、社会治理等治理任务。中国共产党作为大党,要实现高效能治党治国,必须从思想理念、政治整合、能力提升、精神状态、防错纠错、生态营造等方面剖析面临的独有难题,并给出有针对性的治理路径。大党独有难题的终极破解之道,依赖“大党之能”,借助能力涵养从领导权威、思想指南、本领本事、斗争精神、自我革命、人民支持上形成一揽子行动方略。

一类纯跳种群系统的遍历性

为了刻画随机环境与重大突变因素对种群的影响,本文考虑一类由马氏链与纯跳稳定过程驱动互惠种群模型.首先,讨论了该种群模型具有全局正解性.其次,给出了该模型的遍历性的充分条件.最后,探究了该模型的正常返的条件.

中国共产党领导中国式现代化的历史进程、独特优势与基本经验

中国式现代化形成于中国共产党领导人民艰苦奋斗与艰辛探索的伟大征程中。这一过程中,中国共产党以政党属性、政党使命、政党能力、政党组织、政党理论等独特优势为要素支撑成功推进现代化,形成了中国式现代化拓展的理论架构与实践样态。作为一种政党主导的现代化模式,中国式现代化创造了大党支撑和服务大国现代化建设的新典范,彰显出鲜明的政党逻辑,展现出显著的比较优势。立足新时代新征程,要在全面从严治党、坚持守正创新、站稳人民立场、坚持独立自主中持续推进中国式现代化。

以伟大自我革命破解大党独有难题

大党独有难题内含马克思主义政党“底色之题”、社会主义执政党“执政之题”和世界大党“规模之题”三重逻辑维度。自我革命既回应了“大党独有难题”的“独有”之问,又破解了“难题”之问,由此构成以伟大自我革命破解大党独有难题的逻辑向度。党的自我革命与大党独有难题的内在逻辑高度契合、密切相关,要始终将推进伟大自我革命作为解决大党独有难题的根本实践路径,强化政治引领破解“底色之题”,锚定价值指向破解“执政之题”,完善体制机制破解“规模之题”。