压电陶瓷—明胶复合材料的功能效应与实验分析

分析了锆钛酸铝压电陶瓷－明胶复合材料中的功能效应,并对该功能效应的整个响应过程进行了研究,研究结果表明,在压电陶瓷－明胶复合材料中,明胶渗透压的改变是影响压电陶瓷电信号输出发生变化的主要因素,通过乘积效应原理的应用,对复合材料随外界条件的改变而产生的电信号的输出进行了实验研究和理论推导,分析结果与实验符合较好。     

粘弹基上受压粘弹杆的稳定性

由纤维复合等材料研制的各种结构的广泛应用,使得其力学性能的研究日趋重要。由于这类材料具有明显的时间效应,因而,必须采用粘弹性理论研究其与时间相关的各种性质。利用动力学的观点和方法,研究了粘弹性基础上两端受压粘弹性直杆的动力稳定性。考虑杆的线性变形,将问题化为等价的四阶常微分方程,分析了方程不动点的稳定性,由此得到杆的蠕变及瞬时临界载荷,讨论了杆失稳的临界时间,并数值计算了杆的动力响应,得到了相应的     

微重力条件下流动与传热传质的地面模拟

为了给载人航天器热设计提供依据,考核热控系统的适应能力以及确定热湿控制参数。发展了材料－温度－湿度保持技术,以实现微重力条件下导热－对流－辐射换热与传质稳态系统的地面相似模拟。通过调整壁面热流密度分布,可以使尺寸适当缩小后的模型的材料、温度和湿度同时保持不变,同时还能抑制由重力引起的自然对流的作用,从而实现地面模型与微重力场中原型流动、换热和传质相似。并用数值方法对均匀进风条件下的流动、换热和传质的相似性进行了验证。     

流动注射-导数-火焰原子吸收分析技术原理

通过计算机处理流动注射－火焰原子吸收信号数据,建立了流动注射－火焰原子吸收的动力学模型,进而推导出流动注射－导数－火焰原子吸收信号的动力学方程,提出了导数吸收值与质量浓度之间的定量关系。     

辽宁省泥炭资源及其利用

辽宁省泥炭储量为３５３６．２７万ｔ,分有裸露泥炭和埋藏泥炭。其中辽东山地为泥炭丰富区,以裸露泥炭为主,辽南丘陵沿海为泥炭多量区,以埋藏泥炭为主,其它地区泥炭较少,早期泥炭形成于早全新世辽南沿海,中全新世渐次向北扩展,为泥炭旺盛形成时期,晚全新世南部沼泽被埋藏,北部继续发育,全省泥炭以草木富营养型为主,其中尤以新宾泥炭质量为佳,辽宁泥炭在工业,农业等方面有着广泛的应用。     

干湿循环法制备抗菌性 5A 沸石

本文探索了制备抗菌性沸石的新方法———干湿循环处理法,采用５Ａ沸石分别与抗菌性离子Ｚｎ２＋、Ａｇ＋、Ｃｕ２＋的溶液进行干湿循环处理,制备抗菌性５Ａ沸石。研究了反应条件,如温度、浓度、循环次数对沸石中抗菌性离子含量的影响,找出了最佳反应条件。测试了抗菌性５Ａ沸石的耐洗涤性能和抗菌性５Ａ沸石对黑曲霉菌、大肠杆菌及嗜热脂肪芽胞杆菌的抗菌效果。研究结果表明,干湿循环法制备抗菌性沸石,具有抗菌性离子含量多,抗菌性能好,方法简便,反应时间短,节约原料等优点。     

神经网络在橡胶硫化温度预测中的应用

本文针对难以通过在线测温实现等效硫化控制的情况,在确定硫化条件的直接测温实验基础上,提出了用神经网络模型预测实际生产过程中硫化制品内部温度的方法．在该方法中将所测温度值作为样本提供给神经网络学习,温度采集时刻及易测外部温度作为网络输入,输出值则是在硫化时制品难测温点处不同时刻的内温．神经网络通过学习取得了良好的效果,网络输出的温度值将成为等效硫化计算和硫化质量智能控制的有价值的依据．     

煤炭院校会计信息系统设计

本论文论述了“煤炭院校会计信息系统”的代码设计、数据库设计和功能设计三项内容,并给出了完整的“煤炭院校会计信息系统”功能模块图。     

Distribution of δD in 25-cm Surface Snow Along Trans-Antarctic Route (Ⅱ)——The “1990 International Trans-Antarctic Expedition” Glaciological Research

On the way of the "1990 International Trans-Antarctic Expedition", the first author of this paper, the Chinese member of the expedition, collected 104 snow samples in 25-cm surface snow along a 5986-km route on Antarctic ice sheet from west to east. The geographical distribution of δD across the Antarctica by the longest route is obtained from stable isotope analysis for the first time. After discussing regional differences of physical geographic conditions, maritime-continental influence, altitudes and latitudes at sampling sites, the distribution of δD is considered to have a close relation to latitudes, but the topographic effect is prominent in some particular regions. The mean annual temperature at sampling site and its relationship with δD in surface snow covering Antarctica from west to east are discussed also. The δD-temperature gradient from the south end of Antarctic Peninsula to Vostok obtained in this paper is very close to that in Terre Adelie Land obtained by predecessors. The snow-dri     

Accurate quantum calculation of the bound and resonant rovibrational states of Li-(H2)

In a recent paper [B. Poirier, Chem. Phys. 308, 305 (2005)] a full-dimensional quantum method for computing the rovibrational dynamics of triatomic systems was presented, incorporating three key features: (1) exact analytical treatment of Coriolis coupling, (2) three-body "effective potential," and (3) a single bend angle basis for all rotational states. In this paper, these ideas are applied to the Li-(H2) electrostatic complex, to compute all of the rovibrational bound state energies, and a number of resonance energies and widths, to very high accuracy (thousandths of a wave number). This application is very challenging, owing to the long-range nature of the interaction and to narrow level spacings near dissociation. Nevertheless, by combining the present method with a G4 symmetry-adapted phase-space-optimized representation, only modest basis sizes are required for which the matrices are amenable to direct diagonalization. Several new bound levels are reported, as compared with a previous calculation [D. T. Chang, G. Surratt, G. Ristroff, and G. I. Gellene, J. Chem. Phys. 116, 9188 (2002)]. The resonances exhibit a clear-cut separation into shape and Feshbach varieties, with the latter characterized by extremely long lifetimes (microseconds or longer).