雷达驻波比测量方法研究

驻波比是衡量雷达发射机和天馈系统工作状态的一项重要指标.文中提出一种驻波比在线测试方法,该方法通过定向耦合器和电桥电路将雷达系统的入射功率和反射功率提取出来,然后用单片机对所采集到的数据进行预处理,从而计算出驻波比.同时,由于其测量出了雷达发射机的功率,所以也可以用来估计雷达发射机的性能好坏.     

国家一等标准金属量器组标准装置的建立

描述了一等标准金属量器的结构设计原则,所建标准的特点与容量标定方法、误差分析等。实验表明,该标准容器的总不确定度为5×10~(-5)。     

憎水性与接触角的测量

本文探讨了憎水性原理、憎水性判据、接触角的测量和影响因素．实验结果表明，在一定条件下接触角测量值可以具有良好的重复性，可作为憎水性判据．     

A computational algorithm for minimizing total variation in imagerestoration

A reliable and efficient computational algorithm for restoring blurred and noisy images is proposed. The restoration process is based on the minimal total variation principle introduced by Rudin et al. For discrete images, the proposed algorithm minimizes a piecewise linear l (1) function (a measure of total variation) subject to a single 2-norm inequality constraint (a measure of data fit). The algorithm starts by finding a feasible point for the inequality constraint using a (partial) conjugate gradient method. This corresponds to a deblurring process. Noise and other artifacts are removed by a subsequent total variation minimization process. The use of the linear l(1) objective function for the total variation measurement leads to a simpler computational algorithm. Both the steepest descent and an affine scaling Newton method are considered to solve this constrained piecewise linear l(1) minimization problem. The resulting algorithm, when viewed as an image restoration and enhancement process, has the feature that it can be used in an adaptive/interactive manner in situations when knowledge of the noise variance is either unavailable or unreliable. Numerical examples are presented to demonstrate the effectiveness of the proposed iterative image restoration and enhancement process.     

Far-field expression of a high-power laser diode

Based on the off-axis theory, a model for describing the far field with the bipeak structure of a high-power laser diode is proposed. The computed results agree well with the measured far-field data of practical devices. A minimum overall error criterion for fitting the theoretical model with the measured data is also given. The results show that the overall error of this model is less than 5% for popular laser diodes. This model has a simple mathematical structure and can be easily used to design the beam-shaping system and to analyze the propagation properties when the laser beam passes through an optic system.     

时滞反馈Liu系统的动力学行为

研究了具有时滞反馈项作用的Liu系统.文中针对两种典型的时滞反馈情形,着重分析了时滞参数对系统动力学行为的影响.研究结果表明,当Liu系统存有时滞反馈时,其动力学行为将变得异常丰富;时滞参数的改变可引起系统复杂的动力学演化.此外,数值计算还发现了时滞Liu系统的虫洞吸引子.     

相位转换平面的吸波原理分析及应用

常规的雷达吸波材料吸收来自入射到表面的电磁能量并将其转换为热能,本文介绍了一种新型的雷达吸波结构-相位转换平面,采用传输线理论分析了单层和多层相位转换平面结构的工作原理,并给出了不同类型的相位转换平面的频响特性,研究发现多层相位转换平面较单层相位转换平面在更宽的频带范围可以实现反射零点的动态控制,该型结构对于设计频率捷变的雷达吸波材料有重要的参考价值.     

不动管柱分层压裂工艺技术在大牛地气田的研究与应用

针对大牛地气田储层低压、低孔、致密、纵向上目的层多，层间跨距变化大，且单层产能低的特征，开展不动管柱分层压裂改造技术研究，以实现该气田多层叠置气层的均衡改造。通过该工艺的研究和实施，优化了适应于大牛地气田的低伤害氮气增能羟丙基胍胶压裂液体系，形成了一套不动管柱分层压裂工艺技术，并在大牛地气田推广应用，成功率96．55％，较相同储层条件的单井产能明显提高，同时减少作业时间和程序，降低作业成本。     

抗高温油包水钻井液在葡深1井的应用

研制的抗高温油包水钻井液实现了抗高温220℃,其抗高温乳化剂复配后具有优异的乳化稳定性,用它在现场成功地将原抗温180℃的油包水钻井液改造成抗高温220℃的钻井液,在葡深1井四开下部(4590~5500 m)井段应用,圆满地解决了160 d钻井和测井施工的高温稳定性、悬浮性、携屑性、滤失性问题。施工期间50多次起下钻具和测试仪器,都能下到井底,无阻卡显示。解决了松辽盆地深层钻井的钻井液抗高温技术问题。     

德布罗意与物质波：纪念L.德布罗意逝世10周年

通过对德布罗意物质波理论建立过程的分析，说明物质波对量子力学的建立及其对近代新技术的重大影响。