先秦道家生态伦理思想与我国当代生态文明建设

人与自然的关系问题既是先秦道家讨论的中心问题,也是当代生态文明建设的核心问题。早在两千多年前,以老庄为代表的先秦道家就提出了“道法自然”、“无为而治”、“天人合一”的生态伦理主张。在我国当代生态文明建设的进程中,尊重生命本性,顺应自然规律,抑制人的贪欲和齐万物的道家生态伦理思想依然能够提供有益的参考和启迪

Raman and AFM Characterization of Au and Cu Nanorod and Nanowire Arrays

通过电化学氧化法制备具有不同孔径氧化铝模板 ,利用交流电镀的方法在模板中沉积金属 ,再用酸溶解模板可以得到相应尺度的金属纳米线或纳米棒的阵列 .本文利用原子力显微镜和表面增强拉曼技术分别表征了金和铜两种金属纳米线阵列 .研究结果表明 ,作为探针分子的硫氰(SCN )在金属纳米线上的碳氮三键的振动频率随纳米线直径的增大而蓝移 .这一现象可能是因为尺寸效应对纳米线的费米能级造成影响 ,使不同直径的金属纳米线电子结构存在微小的差别 .Recently metal nanowires (nanorods) have aroused tremendous interest because of their novel properties and potential applications in wide fields [1] . Many two?dimensional nanowire arrays of semiconductors and metals with different diameter and length have been made by using template synthesis method. To characterize the novel optical, electronic and magnetic properties of these materials, UV?Vis and fluorescence spectroscopies are two of the most wildly used methods [2, 3] . Raman spectroscopy has, however, only been applied to the characterizing of semiconductor nanowires and carbon nanotubes [4,5] . Important and meaningful information can be obtained in these cases, as some forbidden Raman modes in the bulk materials become Raman active [4, 5] . Raman spectroscopy is apparently not suitable to study metal nanowires since it can only detect the mechanical vibration bands located in the extremely low frequency region. Consequently, an alternative way has to be established to study the metal nano?wires (?rods) with Raman spectroscopy. In the present work, we have taken the probe molecule strategy and used surface?enhanced Raman spectroscopy (SERS) to characterize metal nanorods (nanowires). It is well known that for a molecule which interacts strongly with a surface, its vibrational band frequency and shape are very sensitive to the electronic property, the chemical environment and the morphology of the surface. Hence Raman spectroscopy has long been used to analyze the atomic structures and the electronic properties of the surface indirectly through assessing carefully the spectral changes of the adsorbate known as a probe molecule. On that account, it is of great interest to diagnose the electronic structures of the metal nanorods with the vibrational spectrum of a probe molecule. We have examined the changes in the electronic properties of the nanorods through analyzing the spectral changes of the probe molecule. For this purpose a typical SERS molecule of SCN - was employed. The nanorod arrays of Au and Cu with different diameter from about 15 nm to 130 nm were fabricated electrochemically by means of the anodic aluminum oxide (AAO) templates. To partially expose metal nanowires with various lengths, the AAO template was chemically etched off to a certain extent by an aqueous solution of phosphoric acid or sodium hydroxide as shown in Fig. 1. After the template was etched off, the nanowires can be characterized by TEM, see Fig. 2. The tapping mode AFM image was obtained on a scanning probe microscope (Nanoscope IIIa). SERS measurements were performed on a confocal microprobe Raman system (LabRam I).作者联系地址：厦门大学固体表面物理化学国家重点实验室!化学系福建厦门361005,厦门大学固体表面物理化学国家重点实验室!化学系福建厦门361005,南京师范大学化学系!江苏南京,210097,厦门大学固体表面物理化学国家重点实验室!化学系福建厦门361005,厦门大学固体表面物理化学国家重点实验室!Author's Address: State Key Lab.for Phys.Chem.of Solid Surf.,Xiamen Univ.,Xiamen 361005, China; 1 Dept. of Chem., Nanjing Norm

轻量化罗茨泵无流量脉动无轴向力的耦合设计

为实现扭叶罗茨泵无脉动无轴向力及其轻量化所期望的更大容积利用率与更小内泄漏目的，提出了内共轭轮廓段采用半叶节圆弧的弦高线和叶顶径向等圆弧间隙结构的高形扭叶构造方法，并基于扭叶容积副与斜齿动力副间的无轴向力耦合关系，给出了二者的无轴向力耦合设计方法和实例分析。结果表明，扭叶转子副端面的平－凸共轭及其顶部等圆弧间隙的轮廓构造能有效抑制共轭泄漏和径向泄漏，实现1.6的更大形状系数和0.58的更大容积利用系数；转子两端面60°的扭叶错角能实现理论的无脉动性能；20°~25°的螺旋角能同时满足扭叶转子与标准斜齿轮等端面节圆半径的同轴要求且方法简单。研究为开发高质量泵提供了一定的理论基础

基于链路容量有限的启发式p圈容量分配算法

针对以往启发式p圈容量分配算法未考虑容量有限的问题,提出一种新的启发式算法。该算法以空闲容量为基础,将最大工作容量作为扩张标准来构造p圈,利用构造的p圈进行容量分配。用COST239网络拓扑对算法进行了仿真,结果表明,该算法能利用更少的空闲容量来保护更多的工作容量,且配置p圈数减少

H-S管对超声速欠膨胀自由射流的激励

将激励装置Hartmann-Sprenger(H-S)管集成到传统物超声速射流装置中,来激励射流剪切层中的大尺度结构,并利用纹影成像对其进行实验研究.通过对瞬态纹影图和时均纹影图的分析表明有激励射流可以有效增大射流的扩散宽度,并且在2.2kHz以上激励频率的情况下均有明显的激励效果,扩散宽度相对于无激励情况,增大了近70%

H-ZSM-22载体上Ni/Co对棕榈酸加氢改制影响的研究

与传统石油运输燃料相比,生物航空煤油在全生命周期中CO_2排放量显著降低。藻类被认为是开发生物质燃料的理想原料,且由藻类生物质热化学转化制备的生物原油制备生物航空煤油极具吸引力[1]。本文开发合成Ni/Co-H-ZSM-22(金属/分子筛)双功能催化剂,</p

ZSM35分子筛催化剂上1-己烯骨架异构化反应的研究

在H2／1-己烯=8(分子比)，P-0．2MPa，T=270℃．SV=1．0h^-1的条件下比较了Si-ZSM12、Si-ZSM35、Si-Y、Si-SAPO114种分子筛催化剂的1-己烯骨架异构化反应性能，结果表明：弱酸中心可以满足1-己烯的骨架异构化催化过程；具有0.4～0．6nm孔径的分子筛是1-己烯进行骨架异构的前提条件，研究表明，对于1-己烯骨架异构化反应，在反应温度270℃，反应压力0．2～1．0MPa的反应条件下，Si-ZSM35分子筛催化剂具有独特的1-己烯骨架异构化性能

zsm35分子筛催化剂上1己烯骨架异构化反应的研究

在H2／1-己烯=8(分子比)，P-0．2MPa，T=270℃．SV=1．0h^-1的条件下比较了Si-ZSM12、Si-ZSM35、Si-Y、Si-SAPO114种分子筛催化剂的1-己烯骨架异构化反应性能，结果表明：弱酸中心可以满足1-己烯的骨架异构化催化过程；具有0.4～0．6nm孔径的分子筛是1-己烯进行骨架异构的前提条件，研究表明，对于1-己烯骨架异构化反应，在反应温度270℃，反应压力0．2～1．0MPa的反应条件下，Si-ZSM35分子筛催化剂具有独特的1-己烯骨架异构化性能