基于．NET平台的二维液相色谱仪控制系统设计

采用.NET技术框架。利用完全面向对象的C#语育,根据二维液相色谱的原理,研制了全自动、多功能的二维液相色谱仪系统。论述了二维液相色谱仪控制系统的架构．介绍了系统功能的设计内容。     

Improving passive transfer of immunoglobulins in calves. II: Interaction between feeding method and volume of colostrum fed

The objective of this study was to investigate the effect of method of feeding (nipple bottle vs. esophageal tube feeder) on passive transfer of immunoglobulin (Ig) G when either a large or small volume of colostrum was fed. Newborn bull calves were removed from the dam before suckling and randomly assigned to 1 of 4 colostrum replacer (CR) treatment groups: 1.5 L (100 g of IgG) of CR fed using a nipple bottle (group 1; n = 24); 1.5 L (100 g of IgG) of CR fed using an esophageal tube feeder (group 2; n = 24); 3.0 L (200 g of IgG) of CR fed using a nipple bottle (group 3; n = 24), or 3.0 L (200 g of IgG) of CR fed using an esophageal tube feeder (group 4; n = 25). Blood samples collected at 24 h of age showed that serum IgG levels were significantly greater in calves fed large (3 L) volumes of CR compared with calves fed small (1.5 L) volumes of CR, regardless of feeding method. These differences were attributed to the larger mass of IgG ingested by calves fed 3 L of CR (200 g of IgG) compared with calves fed 1.5 L of CR (100 g of IgG). For calves fed small (1.5 L) volumes of colostrum, serum total protein (TP, g/dL), serum IgG (IgG, mg/mL), acceptable passive transfer rates (APT, %), and apparent efficiency of absorption of IgG (AEA, %) were significantly greater for calves fed with a bottle (TP = 5.3 g/dL; IgG = 12.5 mg/mL; APT = 100%; AEA = 51.1%) compared with calves fed with an esophageal tube feeder (TP = 5.0 g/dL; IgG = 9.8 mg/mL; APT = 41.7%; AEA = 40.5%). However, for calves fed large (3 L) volumes of colostrum, there was no difference in passive transfer indices for calves fed with a bottle (TP = 5.8 g/dL; IgG = 19.7 mg/mL; APT = 100%; AEA = 41.1%) compared with calves fed with an esophageal tube feeder (TP = 5.9 g/dL; IgG = 18.7 mg/mL; APT = 100%; AEA = 39.0%).     

Efficient LDPC‐Based,Threaded Layered Space‐Time‐Frequency System with Iterative Receiver

We present a low‐density parity‐check (LDPC)‐based, threaded layered space‐time‐frequency system with emphasis on the iterative receiver design. First, the unbiased minimum mean‐squared‐error iterative‐tree‐search (U‐MMSE‐ITS) detector, which is known to be one of the most efficient multi‐input multi‐output (MIMO) detectors available, is improved by augmentation of the partial‐length paths and by the addition of one‐bit complement sequences. Compared with the U‐MMSE‐ITS detector, the improved detector provides better detection performance with lower complexity. Furthermore, the improved detector is robust to arbitrary MIMO channels and to any antenna configurations. Second, based on the structure of the iterative receiver, we present a low‐complexity belief‐propagation (BP) decoding algorithm for LDPC‐codes. This BP decoder not only has low computing complexity but also converges very fast (5 iterations is sufficient). With the efficient receiver employing the improved detector and the low‐complexity BP decoder, the proposed system is a promising solution to high‐data‐rate transmission over selective‐fading channels.     

洗发水瓶盖注射模设计

介绍了1副洗发水瓶盖注射模,模具的动模采用外螺纹自动脱模机构和圆弧侧向抽芯机构,外螺纹自动脱模机构动力来源于液压缸,圆弧侧向抽芯机构不需要任何外部动力。模具结构简单,设计新颖,可供同行借鉴。     

基于泰勒原则的螺纹工件检验与其不合格品的追溯方向分析

文章介绍了螺纹工件产品的检测体系,分析了美制统一螺纹量规与米制普通螺纹量规中径公差带位置的异同,最后给出了基于泰勒原则的不合格螺纹工件产品的追溯方向,减少不必要的经济损失和质量事故的发生。     

内螺纹塑件注射模设计

对一款内螺纹塑件进行了模具结构设计,利用内滑块加斜顶的方式来脱螺纹,从而简化了模具结构,对同类塑件的模具设计有一定的参考意义。     

Calculation method of radial stress and deformation on conic threaded connections with interference fit

This paper presents a calculation method for radial stress distribution and deformation on conic threaded connections with interference fit. Based on elastic mechanics, a new calculation model is established using the thick-walled-cylindrical theory. A sample calculation for API 88.9 mm conic threaded connection indicates that the method proposed in this paper is reasonable, and the finite element analysis (FEA) method is used to validate the proposed method. The results obtained by the proposed method and FEA method are identical. The model offers a new way of calculating the radial stress and deformation on conic thread connections with interference fit.     

4^#美标螺纹钢筋的负偏差轧制

通过4＃美标（ASTMA615－87ε1）螺纹钢筋优化孔型设计及负偏差轧制的生产实践，提出实行负偏差轧制时，尤其是精轧延伸孔型系统的选择十分重要，使其变形均匀是实现负偏差轧制的必要条件．本设计延伸孔型系统选择了六角一方孔型系统，夹角90°，其轧件变形均匀，从而实现了负偏差轧制，并收到较好效果。     

API8牙圆螺纹公差与上扣扭矩的试验选择

在对ＡＰＩ标准分析的基础上，通过系统试验，找出了螺距，锥度，中径，接箍不圆度等叁数对ＡＰＩ８牙圆螺纹油管套密封性，连接强度及上扣扭矩－圈数相关性的影响，从而提出了内、外螺纹上扣配合的理想螺纹公差范围。     

基于线索二叉树的辐射状配电网潮流计算

在当前的配电网潮流计算方法中,一些算法的节点编号处理方法比较复杂,因此不适应实际配电网络运行方式的改变,同时也不利于程序的实现,另外,这些算法也没有考虑到树的存储结构对配电网潮流计算速度的影响。针对上面这些不足之处,提出了一种配电网络节点编号的方法和一种把树的非线性存储结构转化为线性存储结构的方法。还推导出了辐射状配电网潮流计算的数学模型,提出了一种新的辐射状配电网潮流计算迭代方法-前推法。经过实践的证明,所采取的辐射状配电网潮流计算方法的确具有以下各优点:收敛可靠性高、收敛速度快、每次迭代所用的时间少、占用内存少和编程简单等等。算例表明,该方法是一种实用的辐射状配电网潮流计算方法。