The roots of the silver tree: Boyle,alchemy, and teleology

Though Robert Boyle called final causes one of the most important subjects for a natural philosopher to study, his own treatise on the subject, the Disquisition about Final Causes, has received comparatively little scholarly attention. In this paper, I explicate Boyle's complex argument against the use of teleological explanations for inanimate bodies, such as metals. The central object of this argument is a mysterious allusion to a silver plant. I claim that the silver plant is best understood as a reference to alchemical product: the Arbor Dianae, an offshoot of George Starkey's recipe for the Philosophers' Stone. Then, I show how the context of alchemy not only clarifies Boyle's argument but also places it within a wider dialectic about matter and teleology. I then contrast the parallel arguments of Boyle and John Ray on the question of whether metals have divine purposes and show that the difference is explained by Boyle's belief in the transmutation of metals.     

轴外物点理想成像的条件

用费马原理证明了轴外物点理想成像的条件     

小波分析在1-10TeV宇宙线气象效应研究中的应用

利用小波变换,结合折叠周期分析方法,对羊八井宇宙线观测站TibetASγ阵列1997年11月到1998年6月的实验记录数据进行周期分析,发现了气象参量,包括观测面处大气压和室外温度的日变化和半日变化.接下来的关联分析表明:宇宙线流强的周期变化与气压和温度的周期变化显著相关.     

天然铅及其同位素全套中子核反应数据的理论计算

用球形光学模型和核反应多步过程的半经典理论，计算了入射能量在1.0keV-20MeV的中子与^204Pb，^206Pb,^207Pb,^206Pb，和^NatPb相互作用的全套核反应数据，计算结果与评价实验数据比较，符合较好。     

Construction of Realistic Scene in Virtual Turning Based on Global Illumination Model and Chip Simulation

With the rapid development of manufacturing technology, the traditional simulation of machining can not meet the people‘s need. Research on virtual machining environment is one of the key parts of virtual manufacturing technology. According to the features of virtual turning, this paper proposes a simplified Whitted lighting model based on analysis of Phong and other local illumination model. This model takes the material and roughness of workpiece into account to calculate the roughness coefficient D, geom...     

高温氧化膜Cr2O3和NiO中应力松弛过程

用Ｘ射线原位应力测定了高温氧化膜Ｃｒ２Ｏ３和ＮｉＯ中的应力．结果表明,Ｃｒ２Ｏ３／Ｃｒ和ＮｉＯ／Ｎｉ体系氧化膜的生长应力分别为－１．９４９ＧＰａ和６５２ＭＰａ．在冷却过程中,Ｃｒ２Ｏ３／Ｃｒ体系发生很大的应力松弛过程,其主要表现形式为氧化膜翘曲和开裂;而在ＮｉＯ／Ｎｉ体系中,由于ＮｉＯ薄膜具有双层结构承受不同应力状态而获得松弛．     

高速公路自动收费系统

本文介绍一种通过红外方式传输智能卡内数据的自动收费系统,实现了高速公路不停车收费。它能有效的解决高速公路收费处车辆堵塞问题,具有较强的实用性。     

光线方程的数值解与光线追迹

改进和完善了已有的光线方程的数值解法，使得该算法更具可操作性，并且给出了两种变折射率光线追迹的图形。     

应用软X射线对林木种子生活力检验的探讨

应用软X射线检验林木种子活力 ,可以快速、准确地判断林木种子的活力 ,从而快速得到林木种子的播种品质 ,为林木种子检验提供了一个全新的检验方法     

SO_4~(2-)/ZrO_2和SO_4~(2-)/TiO_2固体超强酸催化剂的X射线衍射研究

用XRD技术研究了浸渍H2SO4后的无定性ZrO2和TiO2在不同焙烧温度下的晶化、相变及平均晶粒度的变化情况，并对四方相ZrO2的含量进行了初步的考察．实验结果表明，SO4(2-)的引入提高了氧化物的晶化温度，并对晶型的形成有走向诱导作用，使ZrO2易于形成四方相型，TiO2易于形成金红石型四方相的ZrO2含量主要受焙烧温度和处理液浓度的影响，焙烧温度越高，酸浸渍液浓度越大，四方相ZrO2含量越低