条形药包药量计算公式探讨

本文通过现有诸药量计算公式的总结和统计分析，认为经验函数划（ｎ）以二次式较合适。并根据流体动力学理论和临界能量密度破碎准则，推导出ｆ（ｎ）的二次项公式，得ｑ＝ＫＷ２（１十ｎ２）／２；该式较符合实际，故推荐供参考。     

明清图书翻译的特征、种类及作用

本文对我国在明末和清代西学东渐过程中的图书翻译进行了梳理和剖析,总结了这一时期西学翻译的历史概况,阐述了东西文化交流中翻译图书的重要作用,以及历史上有识之士对于西学翻译的贡献。     

小高跨比单层单跨实腹门式刚架平面内弹性整体稳定分析

采用精确的有限元非线性分析方法对小高跨比单层单跨实腹门式刚架的平面内弹性整体稳定性进行了大量的参数分析，指出在梁上均布荷载作用下，当柱梁高跨比小于某一数值时，一般不发生传统理论所认为的反对称失稳模式，而是以对称失稳模式为主。给出了修正的柱计算长度系数，并与规范给出的数值进行了对比，认为这种对称失稳模式更不利于门式刚架的整体稳定，应该引起足够的重视。     

管环缝射线一次透照长度及分段次数的计算

介绍了管环缝射线透照方式，以及环缝单壁外透法和环缝双壁单影法100％射线透照检查一次透照长度及分段次数的计算。     

Isometric Piecewise Polynomial Curves

The main preoccupations of research in computer-aided geometric design have been on shape-specification techniques for polynomial curves and surfaces, and on the continuity between segments or patches. When modelling with such techniques, curves and surfaces can be compressed or expanded arbitrarily. There has been relatively little work on interacting with direct spatial properties of curves and surfaces, such as their arc length or surface area. As a first step, we derive families of parametric piecewise polynomial curves that satisfy various positional and tangential constraints together with arc-length constraints. We call these curves isometric curves. A space curve is defined as a sequence of polynomial curve segments, each of which is defined by the familiar Hermite or Bézier constraints for cubic polynomials; as well, each segment is constrained to have a specified arc length. We demonstrate that this class of curves is attractive and stable. We also describe the numerical techniques used that are sufficient for achieving real time interaction with these curves on low-end workstations.     

GJK-3型高准确度长度测量仪

本文分析了使用计数的原理来测量长度、转速的仪器，其误差产生的原因，并结合G3K-3型高准确度长度测量仪，着重介绍了消除误差的方法．     

Performance comparison of some discrete service time systems

This paper analyzes and compares the slotted time operation and the non-slotted time operation of a singleserver system with deterministic service time. These two operations are commonly used to model discrete service time systems in computer or digital communications. But due to the similarity in their operations and performance, the two models may be mixed up with each other. This paper examines by means of queueing analysis the performance of a few classes of systems that differ in the service order of their customers. The means and variances of the queue lengths, waiting times and interdeparture times of FCFS systems using the slotted time operations are first obtained from their respective LST and generating function equations. These are then used for comparison with those in non-slotted time systems. The results show that although the slotted time operation in the FCFS systems can be approximated by the non-slotted time operations under heavy traffic condition, the performances under other regions and service disciplines (e.g., the LCFS and the priority systems) may deviate significantly. They must be properly adjusted if one wishes to use the simpler equations of the non-slotted time operations to approximate the slotted time operations. The comparison graphs provided in this paper supply adjustments guidelines for the careful designers.     

应用焊道长度控制线能量

运用ＨｅｒｂｓｔＦＷ公式原理对国产碱性条件进行了大量试验，建立了焊接线能量（Ｅ），焊条熔化长度（ｌＥ），焊道长度（ｌＲ）的关系式：Ｅ＝８０８Ｄ１．８ｌＥ／ｌＲ。并应用线算图和ＳＨ－ＣＣＴ图对该式施焊结果验证，热影响区的金相组织，硬度基本一致。因此，可以应用焊道长度校核与控制线能量。     

一种频率估计的倍频等长信号加权融合算法

提出一种新型加权融合算法.首先,根据倍频等长信号间频率的倍数生成倍频修正矩阵,对倍频等长信号频谱进行同频化处理,使之达到同频等长信号频谱的分析效果.然后,针对倍频等长信号的相位不连续问题,设计具有相位连续特性和噪声对消特性的相位补偿矩阵,对同频化的倍频等长信号频谱进行加权融合,使之近似达到与倍频等长信号长度相同的相位连续信号频谱的分析效果.最后,通过谱峰搜索加权融合频谱获得高精度的频率估计值.算法分析与仿真实验表明:与现有方法相比,本算法精度较高,计算量较小,抗噪性强,普适性好.     

激光测速仪在宽厚板轧机后测长的运用

随着国内厚板产量的增加,其市场竞争日趋激烈。为了更好的谋求发展,莱钢宽厚板厂在降低生产成本的同时,通过技术改造极大地提高产品的质量。因为板坯成材规格需要精确的长度数据,所以宽厚板板坯长度的精确测量就显得非常重要。本文主要介绍激光测速仪在轧机后测长系统中的应用。