电沉积颗粒/Cu-Sn复合材料的摩擦磨损特性研究

采用电沉积法制备了不同颗粒（Ａｌ２Ｏ３、ＣａＦ２、滑石（Ｔａｌｃ））增强铜合金（Ｃｕ－Ｓｎ）复 合材料,并用扫描电子显微镜观察了颗粒的分布及复合材料镀层的表面形貌,研究了颗粒性 质和含量对复合材料硬度、摩擦系数和耐磨性能的影响。详细研究了Ａｌ２Ｏ３／Ｃｕ－Ｓｎ复合材 料的磨损特性,并探讨了外加载荷和滑动速度对Ａｌ2Ｏ３／Ｃｕ－Ｓｎ夏合材料磨损率的影响。     

利用阵列几何设置改善方位估计

本文研究了在非等距线阵情况下用空间平滑 Ｍ Ｕ Ｓ Ｉ Ｃ 方法实现方位估计的问题,提出了一种改善方位估计性能的阵列设置方法———即间距组合法．在阵元数一定的情况下,该方法可使阵列的方位分辨率较之均匀线阵（ Ｕ Ｌ Ａ） 有较大的改善,而且还克服了一般稀布线阵方位估计模糊和去相关能力差的缺点,成功地将空间平滑 Ｍ Ｕ Ｓ Ｉ Ｃ这一经典方法用于非等矩阵．     

Cost reduction in location management using semi‐realtime movement information

This paper introduces a dynamic paging scheme based on the semirealtime movement information of an individual user, which allows a more accurate predication of the user location at the time of paging. In general, a realtime location tracking scheme may require complex control schemes and incur unacceptably high computation and messaging cost. Our proposed approach, namely the velocity paging scheme, relaxes the realtime constraints to semirealtime to provide a good combination of cost reduction and ease of implementation. The proposed velocity paging scheme utilizes semirealtime velocity information, namely velocity classes, of individual mobile terminals and dynamically calculates a paging zone (a list of cells to be paged) for an incoming call. Therefore, the total paging cost can be reduced due to the paging area reduction. Much consideration also has been given to reduce the complexity of the proposed scheme. As a result, it only requires minimal extra overhead and is feasible to implement in current cellular/PCS networks. The velocity paging can be combined with the movementbased registration or other registration schemes. Analytical and simulation results of the velocity paging and movementbased registration combination are provided to demonstrate the cost effectiveness of the scheme under various parameters in comparison with the location area scheme.     

钢水覆盖剂保温性能的实验研究

利用单向加热炉对不同材质、不同配比成分的钢水覆盖剂进行了保温性能试验。     

中型开坯轧机实现一火成材的技术改造

阐述了中型开坯轧机通过技术改造实现一火成材,直接将２８０ ×２８０、１２０×１２０ ～１５０ ×１５０（ 单位ｍｍ） 方坯轧成φ１６ ～３５ｍｍ 的棒材,进而降低成本１００ ～１５０ 元／ｔ,提高成材率５ ％ 以上。     

影响热释光剂量计定度系数的因素

介绍了ＴＬＤ定度系数的三种影响因素,并指出剂量传递法定度ＴＬＤ的定度系数,可以使ＴＬＤ测量剂量的相对误差控制在±５％。     

广东大亚湾核电站环境辐射热释光累积剂量监测研究

介绍了利用热释光测量技术对自１９９４年投入商业运行的广东大亚湾核电站周围５０ｋｍ范围的环境γ辐射进行了常规监测。４年来的监测结果表明,核电站周围５０ｋｍ范围内的总体环境γ辐射水平没有发现明显的改变。但在告近核电站１ｋｍ范围内的监测点上,１９９５年监测到来自核电站排放的气载放射性流出物的影响。     

使用FORWARD平台的几点体会

简要回顾了Ｆｏｒｗａｒｄ１．１测井解释平台安装调试与外设驱动过程,介绍某些设备的使用技巧。针对采样间距的统一和深度匹配问题提出了自己的看法和建议。通过实际应用证明该解释平台是一个实用的裸眼井单井解释平台,可以满足现场生产科研的需要,具有投资小,见效快和适用广等优点;接近了国外软件水平,特别适用于我国目前数字测井需求。     

Vicarious calibration of the moderate-resolution imaging spectroradiometer airborne simulator thermal-infrared channels

We made an experimental vicarious calibration of the Moderate Resolution Imaging Spectroradiometer (MODIS) Airborne Simulator (MAS) thermal infrared (TIR) channel data acquired in the field campaign near Mono Lake, Calif. on 10 March 1998 to demonstrate the advantage of using high-elevation sites in dry atmospheric conditions for vicarious calibration. With three lake-surface sites and one snow-field site, we estimated the MAS noise-equivalent temperature difference as 0.7-1.0 degrees C for bands 30-32 in the 3.68-4.13-microm region and 0.1-0.5 degrees C for bands 42, 45, 46, and 48 in the 8-13.5-microm region. This study shows that the MAS calibration error is within +/-0.4 degrees C in the split-window channels (at 11 and 12 microm) and larger in other TIR channels based on the MAS data over Mono Lake and in situ measurement data over the snow-field site.     

无模型自适应控制策略在惯性平台调平系统上的应用

由于传统PID在实现惯性平台调平系统对自适应控制的要求时存在不足,本文提出了一种基于无模型自适应(MFA)的控制方式,以满足系统对输入信号作出快速平稳响应,以及克服不同平台不同参数对系统所造成干扰的要求.实验证明,当系统参数在一定范围变化时,所设计的控制器仍能保证系统具有良好的控制性能,克服由于建模不精确所带来的误差,以及系统在运行过程中,由于受外界干扰而使系统参数发生变化的问题.