双回路铁塔绝缘配合研究

针对三峡500kV双回同塔线路的塔型方案优化选择，依据工程实际情况以及防雷计算结果，对塔头的绝缘配合进行了研究。研究结果表明，所优选推荐并采用差绝缘的塔型尺寸紧凑、质量轻、美观，而且防雷特性较优，尤其是双回同时跳闸率最低。     

影响巨磁电阻钙钛矿锰氧化合物居里温度的结构分析

测定了La1-xAx(MnB）O3型巨磁电阻钙钛矿化合物在不同组成时的居里温度，利用A位离子对晶格能的贡献和B位离子极化力的变化分别对A和B位离子掺杂及A，B位离子组成同时变化时钙钛矿的居里温度进行了分析，结果与实验一致。     

99Tcm-MDP scintigraphy in high-voltage electrical burn patients

In high-voltage electrical burn injuries (> 1000 V), it is difficult to identify the site and extent of non-viable deep tissue damage for debridement to avoid further tissue injury from wound infection and the risk of sepsis. This prospective study was designed to evaluate the usefulness of 99Tcm-methylene di-phosphonate (99Tcm-MDP) scintigraphy in detecting the extent of tissue injury and determining the level of amputation required for electrical burn patients. Over a 5 year period, 33 high-voltage electrical burn patients were studied. Blood flow and blood pool studies revealed absent perfusion in 37 limbs, all of which eventually were amputated. In addition to a routine three-phase bone scan, images were obtained at 30-60 min (early images) to evaluate whether soft tissue injury could be detected better at that time. For comparison of the detection rate from the early images and bone (delayed) images, 164 corresponding spot views of both images were reviewed. Eighty-three and 125 tissue necrotic lesions were demonstrated by the early images and bone images respectively. All of the 83 lesions found by the early images were more clearly identified by the bone images. All but one of the 125 lesions underwent surgical debridement or amputation. We concluded that the blood flow and blood pool images correlated well with the level of amputation required. The site and extent of tissue necrotic lesions can be clearly identified on 99Tcm-MDP bone scans. Because the early images were less sensitive in detecting tissue necrosis, we suggest that early imaging is not necessary.     

坡折带理论在海拉尔盆地乌东斜坡带隐蔽圈闭勘探中的应用

基于海拉尔盆地乌东斜坡带缺乏系统特征研究的现状，依据坡折带的成因类型、坡折带的产状变化和组合样式，应用坡折带理论研究证实：乌东斜坡带存在构造坡折、沉积坡折、侵蚀坡折3种类型；运用储层预测技术，发现沿斜坡带发育多套横向连片纵向叠置的扇体。综合研究认为：断陷湖盆中的构造坡折带，对隐蔽圈闭的形成与分布具有重要的控制作用。     

尼尔基水利枢纽质量 进度及投资控制与管理

尼尔基水利枢纽工程在实施过程中,业主以合同管理为纽带,通过对"质量、进度、投资"的控制与管理,顺利完成了工程建设目标.     

一种基于神经网络的模糊推理方法

对于Zadeh的模糊关系合成法则（简称CRI方法），选择一个适宜蕴涵关系矩阵是至关重要的。通常蕴涵关系矩阵的元素值是通过一个所构造的数学表达式计算的，或是由领域专家凭经验直接给出。然而，有时，特别是对于后一种情形，CRI法不能满足模糊推理最基本的一致性要求。文章构造了一个神经网络用于模糊推理，新方法不仅是CRI方法的推广，而且远比CRI方法易于满足推理的一致性要求。得益于神经网络的长处，新方法具有灵活性、可调性。文章给出了权值的具取值法。     

焊接史

本文追溯了19世纪末发明的电弧焊接的历史。当Oscar Kjellberg成立伊萨公司以探索他发明的涂层焊条时，伊萨从一开始就和电弧焊的发展结下了不解之缘。     

Training sequence design and channel estimation of OFDM-CDMA broadband wireless access networks with diversity techniques

In this paper, an OFDM-CDMA system employing various diversity schemes is considered for a possible candidate of broadband wireless access networks and broadcasting applications. With an emphasis on a preamble design for multi-channel separation, we address a channel estimation based on the time-domain windowing and its imperfectness in OFDM-based multiple-antenna transmission systems. By properly designing each preamble for multiple antennas to be orthogonal in the time domain, the channel estimation can be applied to the HIPERLAN/2 and IEEE 802.11a standards in the case of more than two transmit antennas. Also, the effect of diversity techniques on the performance of OFDM-CDMA based broadband wireless access networks is investigated and the maximum achievable diversity gain for a two-path Rayleigh fading environment is evaluated. Simulation results show that the OFDM-CDMA system applying a space-time-frequency diversity with a full-rate full diversity code can give the diversity of D=4 and D=8 for both multi-user cases of maximum user and half user capacities, respectively.     

胶溶法合成 TiO_2超微粒子

用胶溶法合成了 TiO_2超微粒子。研究了反应物浓度、胶溶剂用量、胶溶温度对胶溶过程的影响,以及表面活性剂 DBS 的量与 Ti 萃取率的关系。探讨了合成超微粒子 TiO_2的最佳条件,分析了产品的特性。200℃热处理得到的产品为非晶型圆球状,粒度均匀,平均6.0nm,在许多有机溶剂中具有良好的分散性和透明性。550℃得到晶态锐钛矿型超微粒子 TiO_2,粒度为8.5nm。700℃热处理得到金红石型TiO_2,粒度为33.2nm。