基于指纹认证的行车安全系统设计

汽车应用的普及带来汽车安全的隐患,基于指纹认证的行车安全系统可实现对驾驶员信息认证、汽车行驶过程、行驶状况、道路状况和交通信息的实时监控,有效预防汽车行驶的安全问题。详细阐述行车安全系统的功能、系统模块设计、硬件系统设计和软件系统设计,分析汽车终端模块的硬件结构和软件功能实现方法,给出基于VC＋＋的汽车终端功能实现的数据类。通过测试,系统能实时、准确地获取汽车行驶的动态数据,有效实现汽车安全管理。     

Modeling of the drying process in paper plants

In this study a model for the drying process in paper production plants was developed based on the mass and heat balances around drying cycles. Relationships for the heat transfer coefficients between the web and the air as well as between the drying cylinder and the web were extracted from the closed-loop plant operation data. It was found that the heat transfer coefficients could be represented effectively in terms of moisture content, basis weight and reel velocity. The effectiveness of the proposed model was illustrated through numerical simulations. From the comparison with the operation data, the proposed model represents the paper plant being considered with sufficient accuracy.     

Modification of margarine fats by enzymatic interesterification: Evaluation of a solid-fat-content-based exponential model with two groups of oil blends

Lipozyme TL IM-catalyzed interesterification for the modification of margarine fats was carried out in a batch reactor at 70°C with a lipase dosage of 4%. Solid fat content (SFC) was used to monitor the reaction progress. Lipase-catalyzed interesterification, which led to changes in the SFC, was assumed to be a first-order reversible reaction. Accordingly, the change in SFC vs. reaction time was described by an exponential model. The model contained three parameters, each with a particular physical or chemical meaning: (i) the initial SFC (SFC₀), (ii) the change in SFC (ΔSFC) from the initial to the equilibrium state, and (iii) the reaction rate constant value (k). SFC_o and ΔSFC were related to only the types of blends and the blend ratios. The rate constant k was related to lipase activity on a given oil blend. Evaluation of the model was carried out with two groups of oil blends, i.e., palm stearin/coconut oil in weight ratios of 90∶10, 80∶20, and 70∶30, and soybean oil/fully hydrogenated soybean oil in weight ratios of 80∶20, 65∶35, and 50∶50. Correlation coefficients higher than 0.99 between the experimental and predicted values were observed for SFC at temperatures above 30°C. The model is useful for predicting changes in the SFC during lipase-catalyzed interesterification with a selected group of oil blends. It also can be used to control the process when particular SFC values are targeted.     

催化湿式氧化处理农药废水的研究

利用担载型双金属活性组分催化剂，考察了反应温度、压力、进料空速和V（空气）：V（H2O）（体积比）等反应条件对催化湿式氧化处理某农药废水效果的影响。对于该种废水，在4．2MPa，245℃，空速为2．0h^-1，V（空气）：V（H2O）＝300的反应条件下，废水的COD去除率可达到91．3％。经处理后废水的BOD5／COD＞0．5，说明其可生化性能良好。     

基于多GPU集群的编程框架

现如今,GPU作为一种低功耗高性能图形处理器单元,被广泛应用于高度并行化的应用程序中。其线程和内存的层次结构在诸多成功的多线程应用和科学研究中表现出巨大的优势。为了简化多GPU集群的编程模式以及更好地利用GPU的计算性能,设计并实现了一个新的基于多GPU的MapReduce并行编程框架。使用了并行虚拟文件系统（PVFS）来存储数据,考虑了动态的负载平衡和GPU相关的权重要素以达到优化系统的效率、透明性以及系统的可伸缩性的目的。在文中,将演示使用该编程模式解决地质应用的一个典型的偏移应用-叠前时间偏移（PKTM）,并给出实验结果。     

PC／TPU共混物的流变性能

用毛细管流变仪研究了聚碳酸酯（ＰＣ）及聚碳酸酯／热塑性聚氨酯弹性体（ＰＣ／ＴＰＵ）共混物的流变性能。实验结果表明：ＰＣ熔体粘度对剪切速率（γ）不敏感，而对温度（Ｔ）敏感。温度升高，ＰＣ粘度降低。加入ＴＰＵ大大改善了共混物的流动性能，使共混物的成型加工变得容易进行。当ＴＰＵ含量为４０份时，共混物的熔体粘度出现一极小值。加入不同第三组分对于降低共混物的熔体粘度效果不同，第三组分Ｅ对共混物有增粘作用     

粗苯甲酸甲酯醇解合成苯甲酸丁酯的工艺研究

研究开发了由对苯二甲酸二甲酯生产过程中副产物粗苯甲酸甲酯合成苯甲酸丁酯的工艺过程。分酯过量与醇过量两种情况分别考察了反应配料比、催化剂用量、反应温度和回流比对转化率的影响 ,确定了最佳工艺条件。实验表明 ,在钛酸酯存在下 ,当醇酯摩尔比为 1.5∶1、催化剂用量为 1%、回流比为 2∶2时 ,反应转化率达 82 .79%。     

双金属氰化物催化剂的研究进展

综述了近年来双金属氰化物（DMC）催化剂的研究进展，指出DMC催化剂是一类用于环氧化物的高效催化剂，与传统的环氧化物催化剂相比，其制得的聚醚多元醇具有分子量高、不饱和度低、分子量分布窄、平均官能度高等优点。但该催化剂在应用过程中仍存在一些缺点。针对这些缺点，国内外的高校、企业已进行了大量的改性研究工作。     

具有谐波减速器的柔性关节参数辨识

为了辨识具有谐波减速器的柔性关节模型的关键参数,设计了一套基于多传感器融合的离线辨识方法,根据电机的位置传感器、电流传感器和关节力矩传感器的实验数据完成柔性关节模型关键参数的辨识.首先,建立采用谐波减速器柔轮输出的柔性关节模型;然后,使用正反转加载力矩的方法辨识出电机的力矩系数;并在空载的情况下,由关节力矩和电机输出力矩分别辨识出关节端和电机端的摩擦力;最后,采用敲击法初步辨识出关节的刚度和阻尼后,在关节位置受限条件下,逐渐增加电机输出力矩,得到柔性关节刚度和关节力矩的非线性关系.多次实验的结果显示,辨识出的参数具有较高的重复性,验证了该方法的有效性.     

PVC新型改性剂AS的合成与应用

本文主要介绍ＰＶＣ新型改性剂ＡＳ树脂的合成方法、产品性能及其在ＰＶＣ异型材、管材、注射、压延片等加工领域中的应用。实验结果证明：该产品完全可以代替ＡＣＲ加工助剂，并有很好的经济效益。