一类Volterra反应扩散方程

我们在本文考虑带Robin边界条件的半线性Volterra生物群体反应扩散方程u_t=Lu-bu~2-uf*u其中L是具有光滑系数a_(ti),a_i的二阶线性一致椭圆算子。此外,a,b是某些正常数,f*u是由ds定义的卷积。我们确定了非负全局有界解的存在性和唯一性,并且证明了当t→∞时解的渐近性质。我们的主要工具是Banach不动点原理和比较方法。     

Feedback forecasting games: An overview

The range and rationales for forecasting schemes involving feedback are surveyed. Classic Delphi schemes involve an iterated exchange of information between a small group of experts in the pursuit of efficiencies arising from the ‘collective mind’. In other applications the event or state to be forecast may itself depend upon the forecast, and feedback forecasting schemes can be derived to allow for such reflexivity. Most situations of informational feedback are at least implicitly informational or predictive games, and a recognition of this character may help in understanding the possible or likely outcomes, including their social desirability. Various informational transfer devices such as real time surveys may speed up the process of feedback.     

Latice Deformation and Meso-Phase Structure in Poly(Ethylene Terephthalate)From Solid State Coextrusion

The development of crystalline and Meso-phase structure by solid state extrusion from50℃ to 90℃ is studied for PET. The unit cell parameters of stress-induced crystallites inextrudates are determined as a function of extrusion draw ratio (EDR), and ext     

Animal culture: But of which kind?

Is animal culture a real entity or is it rather just in the eye of the beholder? The concept of culture began to be increasingly used in the context of animal behaviour research around the 1960s. Despite its success, it is not clear that it represents what philosophers have traditionally thought to be a natural kind. In this article I will show, however, how conceiving of animal culture in this fashion has played a role in the “culture wars”, and what lessons we can draw from this. First, an analysis of the epistemological landscape of author keywords related to the concept of animal cultures is presented, thus vindicating the centrality of the concept in describing a broad range of findings. A minimal definition that encompasses the multiple strands of research incorporating the notion of culture is proposed. I then systematically enumerate the ways in which culture thus conceived cannot be considered a natural kind in the study of animal behaviour. This is accomplished by reviewing the efforts and possibilities of anchoring the elusive idea in specific mechanisms, homologies, selection pressures, homeostatic property clusters, or alternatively, its reduction or elimination. Finally, a plausible interpretation of the scientific status of the animal culture concept is suggested that is compatible with both its well established use in animal behaviour research and its inferential limitations. Culture plays the role of a well-established epistemic kind, a node that connects different areas of research on common themes.     

秦皮乙素的单扫示波极谱法研究

在０．１ｍｏｌ·Ｌ－１ＮＨ４Ａｃ（ｐＨ６．１）溶液中，秦皮乙素在单扫示波极谱上有一灵敏的导数极谱波，峰电位Ｅｐ＝－１．３２Ｖ（ｖｓ．ＳＣＥ）．峰电流ｉｐ与秦皮乙素浓度在４０×１０－６～８．０×１０－５ｍｏｌ·Ｌ－１范围内成线性关系。并用于中药秦皮的测定，得到满意的结果，用线性扫描和循环伏安法探讨体系的伏安行为。，结果表明，该体系属具有吸附性的不可逆过程。     

算术级数中模n原根的一种分布性质

设整数ｎ≥３的在原根，对任意给定的整数ｏ〈ａ〈ｎ且（ｎ，ａ）＝１，必希存在唯一的０〈ａ〈ｎ使得满足ａａ≡１（ｍｏｄｎ）本文主要研究同余方程ａａ≡１（ｍｏｄｎ）在算术级数Ａ＝（ａ０ｍ＋ｂ０）中模Ｐ的原根解的分布性质。     

芬太尼的示波极谱测定与电化学行为研究

在NaOH底液中,芬太尼(FT)在汞电极上有一灵敏的导数还原峰,峰电位为-1.45 V (vs.SCE).导数峰电流与FT浓度在1.0～20μmol·L~(-1)范围内成正比,最低检测限为0.5μmol·L~(-1).应用该方法测定了FT药物样品,结果满意.对FT在汞电极上的电化学行为特别是其吸附性进行了探讨.     

乙烯基酯树脂的合成新法及其性能研究

由2,2-(4,4′-二羟乙基酚基)丙烷与甲基丙烯酸等不饱和酸的酯化产物溶解于苯乙烯中,制成了能室温固化、常压成型的BEM-3型乙烯基酯树酯。分析和探讨了树脂的结构,测定了固化树脂及玻璃钢的性能。结果表明,采用的新合成方法是成功的。该法不仅简化了生产工艺,降低了成本,开辟了合成乙烯基酯树脂的新途径,同时也提高了树脂的耐热和耐腐蚀性能。     

一种对象式软件开发方法及其支持工具

提出了一种改进的对象式软件开发方法,该方法支持从概念建模、逻辑建模到实现的软件开发全过程;介绍了支持这种方法的图形化需求描述语言、形式化需求规格说明语言、由图形化向形式化的转换及由形式化向实现转换的方法和机制;简要地介绍了支持这种方法的一个软件工具的设计与实现。     

试论脂砚斋对《红楼梦》的接受

脂砚斋对《红楼梦》的接受视野是复杂的,接受方式是暗喻性的,接受心理反应是丰富多彩的,接受目的则表现出积极劝世的特点。同时,脂砚斋借助于《红楼梦》的阅读和评点最终实现了自我精神上的安慰与满足。