一个可能最终确定以太存在与否的实验

分析了“光行差”现象、“光速不变”现象、“洛奇钢盘实验”,认为地球有可能拖曳以太。论证了在绕地轨道上进行迈克尔逊一莫雷实验可以最终确定是否存在以太,并设计了相应的设备。     

Principal component analysis and cluster analysis based orbit optimization for earth observation satellites

This paper proposes a design optimization method for the multi-objective orbit design of earth observation satellites, for which the optimality of orbit performance indices with different units, such as: total coverage time, the frequency of coverage, average time per coverage and maximum coverage gap, etc. is required simultaneously. By introducing index normalization method to convert performance indices into dimensionless variables within the range of [0, 1], a design optimization method based on the principal component analysis and cluster analysis is proposed, which consists of index normalization method, principal component analysis, multiple-level cluster analysis and weighted evaluation method. The results of orbit optimization for earth observation satellites show that the optimal orbit can be obtained by using the proposed method. The principal component analysis can reduce the total number of indices with a non-independent relationship to save computing time. Similarly, the multiple-level cluster analysis with parallel computing could save computing time.     

高等教育外部质量保障体系闭环系统初探

阐述高等教育质量保障体系的涵义以及构建我国高等教育外部质量保障体系的理论基础。在此基础上,运用控制论闭环系统理论构建高等教育外部质量保障体系的闭环系统运行框架,旨在探讨构建新形势下高等教育教学质量管理的宏观监控平台,切实加强对高等教育质量的外部监控,保证高校人才培养质量的提高,实现高等教育健康、持续和协调地发展。     

关于闭折线k号心的两个面积定理

研究闭折线的k号心相关的面积问题,得到了几个新的结论.     

The Moral Limits of Open‐Mindedness

Epistemologists have long worried that the willingness of open‐minded people to reconsider their beliefs in light of new evidence is both a condition of improving their beliefs and a risk factor for losing their grip on what they already know. In this article, Matt Ferkany introduces and attempts to resolve a moral variation of this puzzle: a willingness to engage people whose moral ideas are strange or repugnant (to us) looks like both a condition of broadening our moral horizons, and a risk factor for doing the wrong thing or becoming bad. Ferkany pursues a contractualist line of argument according to which such hazardous engagement is a virtue only when it matters to our interlocutors whether they can justify themselves to us on terms we can accept — for our sake or for the sake of their own virtue, not instrumentally or to get something out of us. When it does not so matter, openness can be unintelligent or gullible — in other words, not virtuous.     

AO4^n-型含氧酸根离子中A的杂化方式讨论

应用群论基本原理讨论了AO4^n-中中心原子A的可能杂化方式，结合A在周期表中的位置以及能量近似原理和能量最低原理确定A采取的杂化方式．     

拉格朗日中值定理的另一种证明

格朗日中值定理是微分学中的一个重要定理,其证明方法有多种,但主要是通过构造函数进行的。文章提供了一种新的不通过构造函数进行证明的方法:借助于图形直观,构造一系列闭区间,利用区间套定理和文章提出的引理进行证明。     

农村被撤并学校产权争议的类型、原因及其法律解决

农村被撤并学校产权争议成为当前各地急需解决的法律问题。当前争议主要集中在土地使用权归属、校舍房产权属、土地附着物权属、债权债务承担等四个方面。导致争议产生的原因主要在于政策变化过程新的利益平衡机制尚未建立、争议主体层级性导致契约规则难以达成、土地建筑物主体不同一与现有法律制度冲突等。解决这些争议,需要按照"谁投资、谁所有"、平等协商、同一处置、物尽其用的原则分类进行。     

两个新型4-羟基-3-喹啉羧酸酯类抗球虫化合物的合成

经过亚硝化、催化加氢、缩合、醚化和关环等五步反应,设计并合成了两个新型 4-羟基-3-喹啉羧酸酯类抗球虫化合物．新化合物的合成具有合成路线短、产率高、原料易得、易实现工业化等优点．所有化合物的结构均经1H NMR,IR 和 HRMS 等方法确证．     

钢箱梁桥梁用梯形闭口加劲肋的辊弯成型技术

综述了钢箱梁桥梁用梯形闭口加劲肋在辊弯成型过程中的主要控制技术,提出了钢箱梁桥梁用梯形闭口加劲肋的常用规格和技术要求的建议。