差分式连续时间电流型CMOS跨导—电容低通滤波器

应用信号流图法对电流系统传递函数直接模拟，提出了一种新颖的差分式连续时间电流模式ＣＭＯＳ跨导－电容低通滤波器的实现方案。由于采用了差分式结构和电流负反馈，整个电路方案具有差分式结构和电流型电路的优点；并且仅使用最少数量的ＯＴＡ和电容，与数字ＣＭＯＳ工艺兼容，适于全集成。面向实际电路完成了ＭＯＳ管级的计算机仿真，结果表明，所提出的电路方案正确有效     

Fertilization in vitro. A review over the medical indications and suggestion to unified guidelines for public fertility clinics in Denmark

Medical indications for in vitro fertilization and embryo transfer (IVF-ET) internationally and in Denmark are reviewed. Reports from large international centres document that tubal infertility, unexplained infertility, endometriosis and male infertility are equally good indications for IVF. Traditionally, tubal infertility has been the only medical indication qualifying for IVF treatment within the National Health Service in Denmark. Thus, in this country, couples with unexplained and male infertility and with endometriosis have to pay up to 25,000 D.Kr. per IVF-ET treatment in private fertility clinics. Since there is no scientific basis for this discrimination, it is urged that the present rules are changed, so that couples with unexplained and male infertility and endometriosis are also allowed IVF treatment free of charge in the public fertility clinics.     

网格曲面中孔洞的光滑填充算法研究

三角网格模型是几何描述的一种重要形式，有着广泛的应用。但三角网络模型常常会存在孔洞缺陷。这些孔洞的存在一方面影响视觉效果，另一方面会影响许多后续的操作，如快速原型制造、有限元分析等，因此有必要对这些孔洞进行修补。目前绝大多数孔洞填充算法是将网格模型中的孔洞提取成空间多边形，并对孔洞多边形进行三角化。这种处理方法的主要缺陷是没有考虑网格曲面在孔洞附近的几何形态，因而填充部分不能与整个曲面光滑地融为一体。笔者提出了一种三角网格曲面中孔洞的光滑填充算法。该算法根据孔洞周围网格曲面的几何信息来增加孔洞内部的采样点，然后再对增加的采样点进行三角化，较好地解决了填充部分与整体曲面光滑连接的问题。     

横向各向同性介质纵波非双曲线时差速度分析

在各向异性介质中，纵波反射旅行时具有非双曲线时差特性，随排列长度的增大非双曲线现象更加明显。显然，常规双曲线时距曲线方程已经不能满足描述地震勘探中日益复杂的地球介质模型的需求。为此，在时距关系中增加含炮检距的四次项，并采用分式展开法表示该四次项，同时引入远偏移距收敛因子。改进后的时距关系表达式在形式上接近于常规地震波双曲线型时距关系，清楚地描述了横向各向同性介质中速度随炮检距的变化。实例表明，该算法提高了各向异性介质速度分析精度，改善了剖面叠加效果。     

基于DSP+FPGA的扩频接收机快捕技术

提出一种在接收信号具有显著的多普勒频移的不确定性条件下,采用全数字的、适宜于扩频码和载波快速同步的新型扩频接收机结构。该接收机能在极短时间内建立快速同步,有效地实现实时突发通信。     

钢管打捆包装机的设计

为了提高包装质量，取代原人工打捆，设计开发了钢管打捆包装机，该包装机采用碾拉工艺，通过综合分析拉紧与绞纽组合动作的传动，实现了钢管的打捆包装机械化，使钢管包装质量达到了ISO9000标准要求，同时降低了劳动强度。     

On the Realization of Current－Mode Continuous－Time Operational Transconductance Capacitance Filter

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Effects of high oxygen concentrations on microbial biosensor signals. Hyperoxygenation by means of perfluorodecalin

Amperometric biosensors register oxygen depletion in response to analyte catabolism, and thus are limited by the availability of dissolved oxygen. Microbial sensors containing immobilized cells of Gluconobacter oxydans were hyperoxygenated to 400% of control levels and the effects on sensor responses to glucose were determined. Oxygenated perfluorodecalin (a completely fluorinated organic substance) was as effective in hyperoxygenation as direct sparging with O2, increasing sensor base medium oxygen concentrations from 9.3 to 37 mg/l. Hyperoxygenation enhanced maximal biosensor response amplitudes, particularly at high cell loading densities. Maximal response rates were also improved, although less dramatically. Results suggest that hyperoxygenation may be a new general approach for modulating biosensor responses.