大豆乳清的预处理

针对“膜法回收大豆乳清中的生物活性物质”工艺中的预处理部分进行研究，发现絮凝离心处理分别可以去除乳清中65％左右的脂肪和90％左右的悬浮固体，袋式过滤和精密微孔管等精密过滤手段对乳清的预处理效果不佳，但是袋式过滤可以作为微滤之前的保安过滤方式，为了进一步去除乳清中的杂质和同时灭菌，微滤过程是必须的，包括絮凝离心和微滤在内的预处理过程可以在蛋白质损失率只有10％左右的情况下将悬浮固体全部去除，脂肪去除率高达90％以上。中试的试验结果验证了上述结论。     

程控交换机收号系统模拟的研究

本文提出了一种模拟程控交换机收号系统的有效方法,采用消息驱动收号事件表的思想,运用并发控制技术,实现了在没有话路硬设备的条件下多用户同时拨号在线模拟收号控制的功能。本文提出的收号系统模拟方案已成功应用于某国产中大容量程控交换机的呼叫模拟系统中。     

中频正火焊管的在线矫直

针对焊接油管、套管、锅炉管的焊缝在中频正火热处理时管子弯曲的现象,提出在定径段增设垂直、横向、周向可调的土耳其头机架,对焊管的弯曲实现反弯变形,从而达到在线矫直的目的。     

丙烯酰胺改性蜜胺甲醛树脂的絮凝性能研究

合成了丙烯酰胺改性三聚氰胺（蜜胺）甲醛树脂，研究了其絮凝性能，利用烧杯澄清试验法，考察了酸碱条件，絮凝剂投加量和静置时间对絮凝性能的影响。实验证明：酸性条件，絮凝剂投加量为50mg/L，静置时间为20min时改性树脂的絮凝效果最好。并且与不同絮凝剂进行了浊度去除效果比较。     

适合WSN的超宽带两步TOA估计算法

结合低速率能量检测与高速率匹配滤波的两步超宽带TOA估计算法适合WSN定位。通过采样获得低速率能量序列,找出直达路径(direct path,DP)在序列中的位置,即TOA粗估计。在该能量采样周期内进行相关滤波,由相关峰确定DP位置,即TOA精确估计。能量采样周期、能量块选择门限、相关峰检测门限是TOA估计的关键参数,对它们进行讨论,并给出一种基于最大最小能量比(MMR)的归一化门限模型。在IEEE 802.15.4a信道下的仿真结果表明：算法的运算量低于单一滤波匹配算法,精度优于基于能量检测的非相干算法     

中频逆变直流电阻焊优势探讨

从中频逆变直流电阻焊电源与工频交流电阻焊电源电路的原理出发，对它们进行了比较。前者具有更高的焊接控制精度、焊接质量、更小的变压器体积和质量，进而扩大了电阻焊的应用范围、降低了前期投资成本并且改善了耗能指标。指出中频逆变直流电阻焊将成为电阻焊行业发展的趋势。     

基于模函数与像素值差值的高质量双图像可逆信息隐藏

为解决在一些一对二的交流场景中使用信息隐藏技术来传递信息时对载密图像的视觉质量和载体图像的精确度的高要求问题. 在本文中提出了一种基于模函数和像素值差值(pixel value difference , PVD)的双图像可逆信息隐藏方案, 通过模函数和对数函数确定了PVD范围表, 从而确定在单位面积上的信息嵌入位数以及模函数的系数. 所提出的方案可以在信息嵌入位数不断增加的情况下仍然保持像素值的修改量与信息嵌入位数之比不大于0.5, 所以与目前一些基于PVD的方案相比在像素对差值越大的图像中越占有优势. 实验结果表明与现有的一些在载密图像质量方面优质的方案相比, 具有更高的PSNR和SSIM, 此外本方案在抗RS隐写分析和PDH隐写分析的静态攻击方面上具有良好的性能, 并且避免了大多数在基于像素值差值的信息隐藏方案中对溢出问题的解决方案复杂繁琐的情况.     

A fuzzy reasoning and fuzzy-analytical hierarchy process based approach to the process of railway risk information: A railway risk management system

Risk management is becoming increasingly important for railway companies in order to safeguard their passengers and employees while improving safety and reducing maintenance costs. However, in many circumstances, the application of probabilistic risk analysis tools may not give satisfactory results because the risk data are incomplete or there is a high level of uncertainty involved in the risk data. This article presents the development of a risk management system for railway risk analysis using fuzzy reasoning approach and fuzzy analytical hierarchy decision making process. In the system, fuzzy reasoning approach (FRA) is employed to estimate the risk level of each hazardous event in terms of failure frequency, consequence severity and consequence probability. This allows imprecision or approximate information in the risk analysis process. Fuzzy analytical hierarchy process (fuzzy-AHP) technique is then incorporated into the risk model to use its advantage in determining the relative importance of the risk contributions so that the risk assessment can be progressed from hazardous event level to hazard group level and finally to railway system level. This risk assessment system can evaluate both qualitative and quantitative risk data and information associated with a railway system effectively and efficiently, which will provide railway risk analysts, managers and engineers with a method and tool to improve their safety management of railway systems and set safety standards. A case study on risk assessment of shunting at Hammersmith depot is used to illustrate the application of the proposed risk assessment system.     

Heat transfer characteristics in micro-fin tube equipped with double twisted tapes： Effect of twisted tape and micro-fin tube arrangements

An experimental study was carried out to investigate the influence of double twisted-tape inserts (DTs) in micro-fin tubes (MFs) on heat transfer, friction factor and thermal performance factor characteristics of the compound devices in the following configurations: (1) twisted tapes acted in the same direction (for co-swirl) while MF and twisted tapes acted in the same (parallel) direction (MF-CoDTs:P), (2) twisted tapes acted in the same direction (for co-swirl) while micro-fin tube and twisted tapes acted in opposite directions (MF-CoDTs:O) and (3) twisted tapes acted in opposite directions for counter swirl (MF-CDTs). The MF alone and the MF equipped with a single twisted tape in parallel/opposite arrangement were also considered for comparison. The experiments were conducted for the flows with the Reynolds numbers between 5 650 and 17 000, under uniform heat flux condition. The experimental results indicate that MF-CDTs induce stronger swirl/turbulence flow, resulting in higher heat transfer rate, friction factor and thermal performance factor than other combined devices. The thermal performance factors associated with the use of MF-CDTs were found to be higher than those associated with the uses of MF-CoDTs:P, MF-CoDTs:O and MF alone up to 9.3%, 6.5% and 56.4%, respectively. The empirical correlations developed using the present experimental data for the Nusselt number, friction factor and thermal performance factor are also reported.     

中频弯管工艺中测温的分析及应用

根据中频弯管工艺的特点和辐射测温原原理，提出了适于这一特殊情况的比色（双色）红外测温仪，对影响测温的目标面积与距离系数的关系，管材表面的处理，测温仪的安放位置，水雾的处理，加热区温度分布状况及加热区位置变化等因素进行了详细分析，并提出了相应的解决办法。