斑岩—浅成低温热液型Cu—Au矿H_2O—Cl—S流体性质和演化方式对成矿的制约

斑岩—浅成低温热液型Cu—Au成矿流体最具代表性的是H2O—Cl—S流体。流体的性质强烈控制着Cu、Au的成矿行为,包括溶解性、迁移形式和气—液分配。流体的氧逸度和流体中Cl、S物种相对含量决定金属在流体中的溶解形式,高氧逸度的高温高盐度流体中Cu、Au主要和Cl络合,S-3也可能是促进Au溶解的重要S物种形式。而过量的S有利于Cu、Au等元素以含S离子络合物进入液相流体,与含S中性络合物配分进入气相流体并迁移Au至浅成低温热液环境形成矿床。岩浆需要经历充分的分异,出溶成分和性质有利于金属迁移的流体,形成高品位的斑岩型Cu、Au矿体;上覆叠加浅成低温热液型Au矿体可能需要初始的成矿流体状态进入NaCl—H2O的超临界区、有效的演化方式、良好的流体缓冲环境和有利的Au沉淀场所。相分离和流体—流体反应是沉淀斑岩—浅成低温热液型Cu—Au矿体最重要的流体演化方式。气相流体具有独特的流体性质和演化方式,可能成为十分重要的成矿流体。

我国城市形态的演化方式——以中部地区城市变迁为例

城市从起源时期的城墙、城堡形态开始,经历了漫长的变迁过程。不同的经济社会发展条件决定着城市形态发展不同的演化方式,但不论这些方式如何迥异,归根到底都是极化、复合和集群三种方式作用的结果。这一点在我国中部地区的城市发展中表现得尤为突出,这也从某种上程度证明,一部中部的城市发展史,就是中国城市的发展史。

乡村振兴视域下新型职业农民演化方式探究

近年来,随着对新型职业农民培育手段的逐渐成熟,其“职业性”也愈来愈被人们接纳,但依然面临着文化观念阻碍培训对象多元化、师资结构矛盾凸显、培训手段融入数字技术较少等问题。针对目前面临的问题,本文从教师专业化水平,多元化培训机制、融合大数据时代相关技术以及建立相关的进入退出机制、完善相关评价考核体系等方面提出建议,以期推进新型职业农民培养的进一步完善,巩固我国脱贫成果,促进农业进一步发展与提升。

高技术知识存在和演化方式

高技术知识是"世界3"中的"新秀",存在于"知识之树"的上端或顶端,具有自身的存在方式和演化特点。高技术知识具有三种形式:意识形式(或隐性知识)、符号化形式(或编码知识)和物化形式(或科技黑箱)等。意识形式的高技术知识需转化为符号化形式或物化形式才能被纳入社会系统中发挥作用,而符号化形式的高技术知识是意识形式的高技术知识的显性化,物化形式的高技术知识是意识形式或符号化形式的高技术知识社会化的结果,三者相互作用,相互转化,共同发展,构成高技术知识演化形态。

考虑支付方式演化的公交站点通行能力分析

为探究支付方式演化对站点通行能力的影响,文中结合经典通行能力计算模型,提出了一种混合支付方式环境下的公交站点通行能力计算方法,分析了支付方式演化趋势下公交站点的通行能力变化.采集站点各支付方式占比及支付时长等要素,并通过SPSS多元线性回归模型标定各支付方式的期望支付时长;基于支付方式的演化趋势,分析不同支付方式比例下站点通行能力与站点需求的供给关系.结果表明:手机NFC支付方式的期望支付时长最短(2.064 s),相较IC卡(2.358 s)与手机二维码(3.136 s)分别减少了12.48%,34.18%.以武汉市某公交站为例,分析发现当手机二维码支付比例上升到一定程度时,公交站点的通行能力将不能满足站点需求.当手机NFC为唯一支付方式时,站点通行能力提高8.0%,而当手机二维码为唯一支付方式时,站点通行能力降低16.33%,差异显著.

企业治理方式的多维度演化分析

当前,中国社会已经迈入风险社会阶段,企业所处的环境系统也呈现出结构复杂、利益多元、充斥不确定性等风险社会的特征,故在分析企业治理方式的演化规律时纳入环境变量,对风险社会中企业谋求高质量发展具有重要意义。为此,研究以多维度分析为基本思路,在延伸自企业组织基本因素的条件约束下,构建了开放的多维度分析模型,从资源、协同、交流、规范等多个维度映射了具有多层内涵的企业治理方式,为观察企业治理方式在不同环境条件与生命周期阶段的演化状态提供了分析工具。研究分析发现,企业治理可分为“一事无成”“四面出击”“明显优势”“明显劣势”“优劣并存”“理想高效”六种方式;治理方式将会随着外部环境的变化呈现出周期性波动;思维层面的变化会引发治理方式无规律变动。

准噶尔盆地西北缘构造演化及其与油气成藏的关系

准噶尔盆地西北缘油气资源丰富,但地质结构及演化十分复杂,长期以来一直存在较大争议。本文基于最新勘探进展及区域研究资料,重新梳理了该区的构造变形特征和叠合演化过程,探讨了构造演化与油气成藏的关系。研究认为,准噶尔盆地西北缘具有"东西分带、南北分段、上下分层"的构造特征,二叠纪以来先后经历了早二叠世后造山伸展、中—晚二叠世强烈挤压逆冲、三叠纪继承性逆冲叠加、侏罗纪—白垩纪整体振荡升降和新生代陆内前陆等五大构造阶段,总体上三叠纪前构造活动强烈,三叠纪之后构造趋于稳定。不同地区构造演化过程具有差异性,自北向南3种垂向叠加演化方式形成3类复式地质结构:哈山地区属于"推覆-超剥型",克拉玛依地区属于"逆掩-超剥型",车排子地区属于"冲断-超剥型"。构造演化与油气成藏关系密切,一是不同的叠加演化方式决定了不同的地质结构类型,进而控制不同的源、圈、输导体系等成藏要素及其空间配置关系;二是多期构造活动导致多个成藏期,形成了多种油气成藏模式。准噶尔盆地西北缘经历了多次逆冲抬升,是油气长期指向区,复杂的构造演化导致其具有多源供烃、多期成藏、立体含油的特点。

关于大学文化演化问题的研究

借鉴生物学演化理论对大学文化的演变过程及影响因素进行研究,可以将大学文化概括为四种状态,将大学文化发展分为四个阶段。大学文化的演化按其演化动力来源的不同可以分为自然演化和强制演化两种方式,大学文化的变迁是这两种方式协同作用的结果。在大学里,可以通过这两种方式营造有利于创新型人才成长的文化环境。

供给侧结构性改革的动力源——新时代的十大新消费趋势

党的十九大报告提出中国到本世纪中叶要实现的宏伟蓝图,决定了人民群众的消费水平将不断向上移位,这是中国产生新消费和中高端消费的大背景。中国特色社会主义进入了新时代,我国社会主要矛盾发生了重大变化,人民日益增长的美好生活需要与发展不平衡不充分之间的矛盾决定了供给侧结构性改革这条主线将始终伴随消费方式和消费结构演化的全过程。新消费和中高端消费将呈现十个方面的趋势性特征,消费需求将成为拉动经济增长三架马车中的第一拉动力,成为供给侧结构性改革的不竭源泉,这是一个动态、持久的互动过程。

蜥蜴的卵胎生

蜥蜴的大多数种类为卵生，但有些却营卵胎生的生殖方式。本文从蜥蜴卵胎生的种类、生殖策略、生殖方式演化、卵胎生形成及生物学意义等几个方面进行介绍和分析。

Evolution trend analysis of urban residents’ low-carbon travel development based on multidimensional game theory

In the travel process of urban residents,travelers will take a series of activities such as imitation and exclusion by observing other people’s travel modes,which affects their following trips.This process can be seen as a repeated game between members of the travelers.Based on the analysis of this game and its evolution trend,a multi-dimensional game model of low-carbon travel for residents is established.The two dimensional game strategies include whether to accept the low-carbon concept and whether to choose low-carbon travel.Combined with evolutionary game theory,the low-carbon travel choices of residents in different cities are simulated,and the evolutionary stability strategies are obtained.Finally,the influences of the main parameters of the model on the evolution process and stability strategies are discussed.The results show that travelers would develop towards two trends.Cities with more developed public traffic system have a higher proportion of receiving low-carbon concept and choosing low-carbon travel.Cities with underdeveloped public transport system could increase this proportion by some measures such as encouraging residents to choose slow transport and increasing the propaganda of low-carbon travel,but the positive effects of the measures like propaganda have a limited impact on the proportion.

Extension of Variable Separable Solutions for Nonlinear Evolution Equations

We give the generalized definitions of variable separable solutions to nonlinear evolution equations, and characterize the relation between the functional separable solution and the derivative-dependent functional separable solution. The new definitions can unify various kinds of variable separable solutions appearing in references. As application, we classify the generalized nonlinear diffusion equations that admit special functional separable solutions and obtain some exact solutions to the resulting equations.

Preserving Coherence of Coherent State Studied via Weyl-Wigner Correspondence

By means of the Weyl correspondence and the explicit normally ordered expression of the Wigner operatorwe convert the time evolution equation of coherent states,governed by some Hamiltonian operators,into seeking forconsistent solution of a set of evolution equtions of classical variables which can meet the requirment that an initialcoherent state remains coherent all the time.

Binary Bell Polynomials,Bilinear Approach to Exact Periodic Wave Solutions of(2+l)-Dimensional Nonlinear Evolution Equations

In the present letter, we get the appropriate bilinear forms of （2 ＋ 1）-dimensional KdV equation, extended （2 ＋ 1）-dimensional shallow water wave equation and （2 ＋ 1）-dimensional Sawada -Kotera equation in a quick and natural manner, namely by appling the binary Bell polynomials. Then the Hirota direct method and Riemann theta function are combined to construct the periodic wave solutions of the three types nonlinear evolution equations. And the corresponding figures of the periodic wave solutions are given. Furthermore, the asymptotic properties of the periodic wave solutions indicate that the soliton solutions can be derived from the periodic wave solutions.

Parameter optimization of electric bus transmission system based on dynamical evolutionary algorithm

The transmission ratio is the key parameters influence power performance and economic performance of electric vehicle （EV）. As a class of heuristic algorithms, Dynamical Evolutionary Algorithm （DEA） is suitable to solve multi-objective optimization problems. This paper presents a new method to optimize the transmission ratio using DEA. The fuzzy constraints and objective function of transmission ratio are established for parameter optimization problem of electric bus transmission. DEA is used to solve the optimiza- tion problem. The transmission system is also designed based on the optimization result. Optimization and test results show that the dynamical evolutionary algorithm is an effective method to solve transmission parameter optimization problems.

A Simple Approach to Derive a Novel N-Soliton Solution for a (3+1)-Dimensional Nonlinear Evolution Equation

Based on the Hirota bilinear form, a simple approach without employing the standard perturbation technique, is presented for constructing a novel N-soliton solution for a （3＋1）-dimensional nonlinear evolution equation. Moreover, the novel N-soliton solution is shown to have resonant behavior with the aid of Mathematica.

“中国之治”的制度机理与发展逻辑——评《中国之治:制度体系与治理效能》

“制度构造了人们在政治、社会或经济领域里交换的激励,制度变迁决定了人类历史中的社会演化方式,因而是理解历史变迁的关键。”①在一个国家的各种制度中,政治制度处于关键环节。一个国家的政治制度决定于这个国家的经济社会基础,同时又反作用于这个国家的经济社会基础,乃至于起到决定性作用。各国国情不同,每个国家的政治制度都是独特的,都是由这个国家的人民决定的,都是在这个国家历史传承、文化传统、经济社会发展的基础上长期发展、渐进改进、内生性演化的结果。

The Impacts of Initial Perturbations on the Computational Stability of Nonlinear Evolution Equations

The impacts of initial perturbations on the computational stability of nonlinear evolution equations for non-conservative difference schemes and non-periodic boundary conditions are studied through theoretical analysis and numerical experiments for the case of onedimensional equations.The sensitivity of the difference scheme to initial values is further analyzed.The results show that the computational stability primarily depends on the form of the initial values if the difference scheme and boundary conditions are determined.Thus,the computational stability is sensitive to the initial perturbations.

Evolution of Arbitrary States under Fock-Darwin Hamiltonian and a Time-Dependent Electric Field

The method of path integral is employed to calculate the time evolution of the eigenstates of a charged particle under the Fock-Darwin(FD) Hamiltonian subjected to a time-dependent electric field in the plane of the system.An exact analytical expression is established for the evolution of the eigenstates.This result then provides a general solution to the time-dependent Schro¨dinger equation.

Three-Step Difference Scheme for Solving Nonlinear Time-Evolution Partial Differential Equations

In this paper, a special three-step difference scheme is applied to the solution of nonlinear time-evolution equations, whose coefficients are determined according to accuracy constraints, necessary conditions of square conservation, and historical observation information under the linear supposition. As in the linear case, the schemes also have obvious superiority in overall performance in the nonlinear case compared with traditional finite difference schemes, e.g., the leapfrog(LF) scheme and the complete square conservation difference(CSCD) scheme that do not use historical observations in determining their coefficients, and the retrospective time integration(RTI) scheme that does not consider compatibility and square conservation. Ideal numerical experiments using the one-dimensional nonlinear advection equation with an exact solution show that this three-step scheme minimizes its root mean square error(RMSE) during the first 2500 integration steps when no shock waves occur in the exact solution, while the RTI scheme outperforms the LF scheme and CSCD scheme only in the first 1000 steps and then becomes the worst in terms of RMSE up to the 2500th step. It is concluded that reasonable consideration of accuracy, square conservation, and historical observations is also critical for good performance of a finite difference scheme for solving nonlinear equations.