小小“自然角” 玩出大智慧——基于幼儿问题探究的自然角创设

认知心理学家皮亚杰曾说过:"儿童的思维是在与环境的相互作用中发展起来的。"要解放幼儿的思维就要多提供一些机会让幼儿去接触大自然,去了解自然界的的花草树木。"自然角"便成为了幼儿学习和感知大自然的一个窗口。对此,本文结合作者的教学实践,从自然角创设的意义、自然角创设的多元化、自然角创设的探究性三方面,阐述了如何让"自然角"成为孩子们自主探究的主要手段。

“自然角”,幼儿探究能力培养的绿色窗口

班级自然角是幼儿接触自然,了解、探究自然的窗口,结合生态教育理念,作者从自然角中蚕宝宝的饲养过程的案例,给孩子自主探究的机会,让探究在好奇中萌芽,在引导下发展,在责任中深入,在惊喜中延续。

Laminar natural convection characteristics in an enclosure with heated hexagonal block for non-Newtonian power law fluids

This work illustrates the steady state, two dimensional natural convective flow and heat transfer features in square enclosure containing heated hexagonal block maintained either at constant wall temperature(CWT) or uniform heat flux(UHF) thermal conditions. Governing equations(mass, momentum and energy) are solved by using finite volume method(FVM) with 3rd order accurate QUICK discretization scheme and SIMPLE algorithm for range of field pertinent parameters such as, Grashof number(10~3≤ Gr ≤ 10~6), Prandtl number(1 ≤ Pr ≤ 100) and power law index(0.5 ≤ n ≤ 1.5). The analysis of momentum and heat transfer characteristics are delineated by evolution of streamlines, isotherms, variation of average Nusselt number value and Colburn factor for natural convection(j_(nH)). A remarkable change is observed on fluid flow and thermal distribution pattern in cavity for both thermal conditions. Nusselt number shows linear variation with Grashof and Prandtl numbers; while rate of heat transfer by convection decreases for power law index value. Higher heat transfer rate can be achieved by using uniform heat flux condition. A Nusselt number correlation is developed for possible utilization in engineering/scientific design purpose.

The Nature of Self-Damaging Women in Charles Dickens＇ Novel Bleak House

This study intends to explore and analysis the portrayal of self-damaging behavior, which encapsulates two female characters： Lady Dedlock and Mademoiselle Hortense in one of the most famous novels of Charles Dickens＇ Bleak House （1984）. An evaluation of these two female characters shows and reflects that their self-damaging behavior emerges from low self esteem, which results from a number of reasons. The self-damaging behavior introduced by these women involves： self-imposed isolation, women madness, purposive accidents, physical self-abuse, and most consequently, conscious pursuit of destructive relationships with men. Although Dickens clearly means no maliciousness to women in his works, the great Victorian marital upheaval of June, 1858, is illustrative of Dickens＇s ambivalent attitude towards women, especially towards strong women

The Trinity Triangle and the Homonymy of the Word ＂Is＂ in Natural Language

There are philosophers and logicians who do think that the Trinity-triangle makes up an evident formal-logic inconsistency demonstrating convincingly that Christian faith is illogical and hence irrational one. The present paper submits a systematic counter-argumentation against such thinking. According to the submitted counter-arguments, there is no formal-logic inconsistency in the Holy-Trinity-triangle： There is only a logic-linguistic illusion of such inconsistency which illusion is naturally produced by the ambiguity of the word ＂is＂ in natural language. The author has invented an effective remedy for that illusion, namely, a precise formulation of the generalized and thus modernized Guillotine of Hume by means of an artificial language of two-valued algebraic system of formal ethics of moral rigor. Systematical using the mathematized formulation of the generalized Hume＇s Guillotine cuts down the mentioned linguistic illusion of logical inconsistency. Thus, the paper essentially interconnects discrete mathematical representations of formal iogic of thinking and formal ethics of acting. In relation to contemporary symbolic logic, the author submits not a technical result solving some important particular problem concerning some specific system of symbolic logic but a significantly new result of conceptual work concerning logic in general and its interconnection with mathematical ethics. The old idea of logic as a moral science is transformed into a novel idea of symbolic logic as a brunch of mathematical ethics. In particular, two-valued algebra of classical formal logic is considered as a particular case of two-valued algebra of formal ethics of moral rigor. The submitted conception of logic is instantiated by applying it to the knotty logic-problem of Holy-Trinity-triangle.

The Anti-metaphysical Turn in the Philosophy of Love （From the Cartesian Perinatai Perspective on Love to Diderot＇s Free Love in His Supplement to Bougainville＇s Journeys）

In my paper, I show how the metaphysical aspect of the earlier concepts of love faded away through the disappearance of the essential references to God as the one, omniscient, omnipotent and benevolent being of the creation of nature, physis. Although in the seventeenth century, the structure of nature was conceived roughly in Epicurean terms, this concept was thought to be in need of a completion through a parallel system of being directed by teleological causality in one way or other. A synthesis of the Epicurean-scientific and the Christian teleological worldview was the main point in the philosophical agenda. The Enlightenment period meant a radical break between this soul-centred view and a new body-centred view most of the important thinkers were persuaded of. I exemplify this radically new look at the human being-in-the-world by presenting some ideas from ~ 50 of Diderot＇s ＂Thoughts on the interpretation of nature＂ （Pensdes sur l＇interprdtation de la nature）. Diderot attributes the faculties of feeling and thinking to all being from the tiniest molecules to the most complex beings, dispensing in this way with the typically seventeenth-century idea of God as the personal warrant of the pos- sibility of cognition. The sentient elements＇ j,~,~ng other corpuscles is no more governed by an omniscient creator but by the dynamism of the process itself. This boundless, creative, dynamic fluidity of being, this newly conceived nature in continual flux seemed to be captured best by such elastic faculties as imagination or sentiment. This is one of the reasons for the overall dominance of these faculties in the French and Scottish versions of the philosophy and theory of art of Enlight- enment. The consequences of all this in domain of the thinking on love will be presented by way of a reflection upon Diderot＇s ideas on the mixing of human andanimal species in the Dream of D＇Alembert and on his ideas on ＂free love＂ in his Supplement to the voyage of Bougainville （1775/1796）.

Thermo-fluidic characteristics of natural convection in honeycombs:The role of chimney enhancement

The natural convective heat transfer performance and thermo-fluidic characteristics of honeycombs with/without chimney extensions are numerically investigated.The present numerical simulations are validated by the purposely-designed experimental measurements on honeycombs with/without chimney.Good agreement between numerical simulation and experimental measurement is obtained.The influences of inclination angle and geometric parameters such as cell shape,streamwise and spanwise length are also numerically quantified.With the increment in inclination angle,the overall heat transfer rate decreases for the honeycombs with/without chimney.For honeycombs with the same void volume fraction but different cell shapes,there is little difference on the overall heat transfer rate.To enhance the natural convective heat transfer of honeycombs,these techniques including increasing the length of honeycomb in the streamwise/spanwise direction,increasing the thermal conductivity of hon-eycomb structure or adding a chimney extension may be helpful.