超大型工程群塔作业管理

北京东方广场工程具有塔机数量多（２０台塔机同时作业）、相互影响大、运行易碰撞和拆塔困难等特点。为此，在组织管理、群塔平面布置和拆塔过程中，制定了合理的制度和措施，保证了工程安全、顺利进行。     

进化机器人的发展概况

进化机器人就是将复杂巨系统的自适应理论运用于机器人的设计中，本文首先给出复杂巨系统的概念，并从“人工脑”（Artificial Brain)开始，简单介绍了“人工脑”发展过程，本文对进化机器人的图内外发展状况进行了介绍，给出了进化机器人的一个典型实例：情感机器人，作为对进化机器人的具体介绍。     

巨型钢框架结构的二阶分析

对巨型钢框架结构的分析 ,采用连续化的数学模型和角变位移法建立了巨型柱、巨型梁的等效刚度方程式和二阶内力分析的角度位移公式 ,并举例说明其应用 ,供方案设计时参考     

GEOCHEMICAL CHARACTERISTICS OF NATURAL GAS AT GIANT ACCUMULATIONS IN CHINA

A total of six giant gasfields each with proven reserves of more than 100 billion cubic metres are present in the Ordos and Tarim Basins, China. The gasfields are Sulige, Yulin, Wushenqi, Da'niudi and Jingbian in the Ordos Basin, and Kela 2 in the Tarim Basin. In this paper, we report on the geochemical characteristics of the natural gas at these fields based on studies of gas composition (150 samples), together with stable isotope data (143 samples) and helium isotope data (21 samples). Results show that the gases have high contents of C_1-4 alkanes (generally over 90%) and minor contents of CO₂ (below 3%). The generally high δ¹³C values of C₁-C₄ hydrocarbons indicates a significant contribution from humic source rocks such as Permian-Carboniferous and Mid-Lower Jurassic coal measures. δ¹³ C₁, δ¹³C₂, δ¹³C₃ and δ¹³C₄ values for gases in Upper Palaeozoic reservoirs were -35 to -32‰, -28 to -24‰, -27 to -24‰, and -23.5 to -22‰, respectively. The δ¹³C_iC4 value is higher than that of the δ¹³C_nC4•
He³/He⁴ ratios vary from 10^-7 to 10^-8, indicating that the helium is of crustal (as opposed to mantle) origin. The CH₄/ He³ ratio is 10¹⁰ - 10¹¹, indicating that the CH₄ is of biogenic origin. None of the data is consistent with an abiogenic origin for gas in the Ordos Basin.     

网架结构在巨型广告牌中的应用

建造于地势较高山顶上的广告牌是一种大跨、高层的构筑物,主要承受水平荷载。以浙江省湖州对坞山巨型广告牌工程为背景,通过对几种可行方案的对比分析,论述了结构选型的重要性,指出了网架筒体结构是适用于该工程的结构类型,在此基础上对影响其受力性能的两个重要参数作了计算分析。同时,风荷载的取值问题是该工程设计的关键,根据规范要求,详细地论述了计算网架筒体结构风荷载的简单方法。其结论可为大跨、高层的类似构筑物的结构选型、设计提供参考。     

Giant Magnetoresistance and Its Sensor Applications

Current status is addressed for spin polarized transport such as spin-dependent scattering and spin-dependent tunneling in artificial structured magnetic thin films. The main points discussed include the physical origin of the giant magnetoresistance (GMR) and various GMR materials. The applications of the GMR to magnetic sensors such as read heads for ultra high density magnetic recording are also discussed.     

超磁致伸缩自感知执行器的理论与实验研究

对自感知的两种实现方法：电桥电路解耦与观测器解耦法,分别进行仿真并对观测器法进行实验验证。电桥电路仿真加入非线性模型,并对桥路输出信号进行放大滤波,为实验提供理论依据。观测器通过实验与观测计算对比验证了基于观测器自感知的可行性。     

Observation of the ultrastructure of anterior cruciate ligament graft by atomic force microscopy

This study presented the fibril ultrastructure of retrieved grafts from the reconstruction of anterior cruciate ligament (ACL) using atomic force microscopy (AFM). The tapping mode images of the AFM were taken from different areas of the longitudinally cut grafts. Regular arrangement of collagen fibrils was found in certain areas of the graft. In many areas, however, the fibrils were not well arranged in a single direction, with some smaller fibrils oriented vertically to larger parallel fibrils. The crossing and tangling of fibrils in ACL grafts was well represented in the three‐dimensional AFM image. This abnormality of graft ultrastructure might indicate the possible alteration of the mechanical environment after ACL reconstruction. This study demonstrated the suitability and importance of ultrastructure observation of ACL grafts by AFM. SCANNING 31: 19–23, 2009. © 2009 Wiley Periodicals, Inc.     

不同结构多层膜中巨磁阻抗效应的研究

研究了封闭式和开放式FeSiB/Cu/FeSiB多层膜以及Cu/FeSiB/Cu多层膜中的巨磁阻抗效应。实验结果表明：多层膜的不同结构对巨磁阻抗效应影响很大。改变外加磁场,封闭式FeSiB/Cu/FeSiB多层膜中阻抗变化最大,开放式FeSiB/Cu/FeSiB多层膜次之,而Cu/FeSiB/Cu多层膜中阻抗几乎不变。三组多层膜中不同的阻抗特征可用多层膜的具体结构解释：在封闭式多层膜内,磁路形成密封结构,使泄漏到多层膜外面空间的磁通大大减少;在Cu/FeSiB/Cu多层膜中,上下两铜层在铁磁薄膜内产生的总磁场近似为零,外加磁场的改变不能引起其阻抗发生变化。对于封闭式FeSiB/Cu/FeSiB多层膜,在100kHz到1MHz时就能够出现较大的阻抗变化比值,最大阻抗变化比值出现在3MHz。开放式FeSiB/Cu/FeSiB多层膜阻抗特性与封闭式类似,但比例只是封闭式多层膜的1／3。     

Cu掺杂对 Fe/Si多层膜的层间耦合和负磁电阻效应的影响

研究了Cu掺杂对Fe/Si多层膜的层间耦合和负磁电阻效应的影响。在用磁控溅射方法制备的Fe/Si多层膜中,发现在Si的标称厚度tSi =1.9nm附近存在一较强的反铁磁耦合（AFM）峰和与之相对应的负磁电阻峰,在Si层中掺入6％的Cu后,发现反铁磁耦合峰的饱和场显著降低,峰宽变窄,峰位略向较厚方向移动。掺杂后磁电阻峰的宽和峰位变化与AFM峰相似,而磁电阻峰值则略有下降,在液氮温度T＝77K下,掺杂前后具有负磁电阻效应的多层膜样品阻率都降低,而磁电阻效应和饱和场均增大,实验结果表明,用磁控溅射方法制备的Fe/Si多层的层间耦合机制和磁电阻效应的机制与磁性金属／非磁金属多层膜的层间耦合及磁电阻效应的机制是一致的。