浅议公路环境保护与环境影响评价

对公路建设环境保护作了比较深入地分析与探讨,总结归纳了公路施工、营运期环境保护工作的重点与措施,并通过与国外公路环境保护比较,对环境影响评价制度与方法进行了全面阐述.     

E(×)e系统耦合性质初步研究

使用幺正转化方法对E(×)e系统的绝热势能进行计算,得到势能面的最低槽,对二次耦合项所引起的绝热势能面的变形做初步探讨;利用Mathematica软件对该系统能量和线性耦合强度的函数关系做数学模拟.与求解繁琐的声子态方法相比,该方法不仅减少了计算量,而且更能体现出相关参量的物理含义.     

网箱养殖区野生许氏平的种群数量

利用非线性回归法,评估得到爱莲湾野生许氏平的丰度为0.01 ind/m2,种群数量大体和5.6个大型抗风浪网箱或135个筏式网箱放养的鱼类数量相当.野生鱼类将产生正或负的生态效应,和养殖鱼类竞争DO,因排泄而支持爱莲湾初级生产所需氮的0.8%~1.3%,同时消耗残饵和排出粪便.     

区域旅游资源开发极限效应研究

通过对旅游效应的概念、类型以及区域旅游资源开发对目的地系统产生的环境、经济和社会效应的分析,提出区域旅游资源开发的极限值也就是旅游目的地系统与环境两方面的正效应达到最优、负效应最大限度地被抑制的临界点的观点,为如何在区域旅游资源开发中实现经济、社会和环境三大效益的最佳均衡效益提供了新的思路。     

Theoretical studies of C36 encapsulated in zigzag single-wall carbon nanotubes

Discovery of carbon nanotubes (CNTs) has attracted considerable attention in the scientific community due to their unique structures and properties. Chemical doping can further modify the electrical properties of CNT. The empty space inside CNT provides t…     

Synthesis and properties of a Pr（Ⅲ） complex with 2-acetylbenzimidazoledehyde-glycine Schiff-base ligand

Abstract The 2-acetyl-benzimidazoledehyde-glycine Schiff-base ligand and the corresponding Pr（Ⅲ） complex Pr2L3（NO3）3· 2CH3OH （L=C11H10N3O2） were synthesized in methanol and characterized by a series of methods, including chemical analysis, elemental analysis, TOF-MS, ^1H NMR, UV-, IR-, Raman spectra, thermal analysis, and the three-dimension fluorescence excitation and emission spectra. The Pr（Ⅲ） complex exhibits extraordinary water-solubility and the Pr（Ⅲ） hydroxide appears at pH≥13. The complex also possesses specific fluorescent properties. Thus, at the excitation wavelengths 200.0-280.0 and 260-350 nm the fluorescence bands were observed at 290.0 and 400.0 nm, respectively.     

Two typical phenomena from the numerical simulation of fire and smoke transport in a gymnasium fire

Building a large centralized atrium in a building has become favourable both to designers and owners. The space of an atrium in a hall, theatre or gymnasium, can occupy an area as large as thousands of square meters and a height as high as 10―30 meters[1…     

Efficient polymer light-emitting diodes with violet blue emission based on blends of PSiF6-PPP and PSiFC6C6

Efficient polymer light-emitting diodes (PLEDs) with violet blue emission were fabricated using blends of copolymers of paraphenylene-co-silafluorene (PSiF6-PPP) and polymer of poly (9,9'-alkyl-3,6-silafluorene) (PSiFC6C6). The performances of the devices are sensitive to the blend ratio. When the mass ratio of PSiF6-PPP to PSiFC6C6 is 1 : 3, the highest external quantum efficiency is 1.96% at luminance of 105 cd.m2, its electroluminescent (EL) spectrum peaks at 398 nm and full width at half maximum is 67 nm. The improvements of the device performances were due to the energy transfer from PSiFC6C6 to PSiF6-PPP and the balanced injection of electrons and holes.     

单根碳纳米管的低温电输运性质

报道了单根碳纳米管的低温电输运测量结果,特别关注了由于碳纳米管在长度方向的尺寸较小时产生的库仑阻塞性质,碳纳米管的低温电输运出现了零偏置反常和库仑振荡。因此碳纳米管在小的尺寸和低温时不仅出现能量量子化而且可以出现电荷量子化-量子点的行为。     

CFRP加固钢筋混凝土简支梁桥的设计计算

由于碳纤维受力过程中特有的线弹性性质，粘贴加固计算时需判断加固截面的应变状态。结合某钢筋混凝土简支T形桥梁粘贴碳纤维片加固设计，应用碳纤维片加固受弯构件正截面强度计算公式，介绍了该公式在加固设计及强度复核中的应用方法及注意事项。加固前后的荷载试验结果表明，粘贴碳纤维片可大大提高主梁的抗弯刚度，增加主梁的承载潜力，有效抑制了混凝土的开裂。