莱芜黑猪肉中烟酸含量的测定

采用高效液相色谱法测定莱芜黑猪肉中烟酸的含量,并对提取方法及色谱条件等方面进行了改进,以Kromasil C_(18)柱为分离柱,甲醇–0.05mol/L磷酸二氢钾缓冲液(体积比5∶95)为流动相,柱温30℃,紫外检测器在波长261nm条件下检测,可以在4min左右完成分析。烟酸在1.0～25.0mg/L范围内有良好的线性关系(R=0.9998),相对标准偏差为0.62%(n=6),平均加标回收率为98.4%,检出限为2.0×10~(-4)g/kg,为准确测定莱芜黑猪肉中的烟酸含量提供了一种简便快捷的检测方法。     

小像元红外探测器读出电路设计研究

介绍了基于SMIC 0.18 μm 3.3 V工艺设计研究的第一款小像元红外探测器读出电路,间距10 μm,规模1024×1024。文章详细介绍了像素输入级以及列级、输出级运放的设计,为提高线性摆伏,设计选用了低阈值NMOS管nmvt 33,仿真分析证明低阈值管nmvt 33的噪声性能优于普通管n 33；版图设计对关键信号线和敏感点采取隔离处理措施,对像元间串扰进行了仿真分析,有效控制了信号串扰。电路经测试使用各项功能正常,最大电荷处理能力达到4.3 Me-,动态范围≥65 dB,读出速率达到10 MHz,性能指标满足设计要求。     

阀门产品图形与数据的计算机管理

阀门产品具有种类、规格多，应用面广的特点。采用产品结构树形式作为系统数据存放结构，用VB套装数据、图形软件，Solidworks软件进行实体造型及参数化设计，3DMAX软件进行渲染、动画，采用ACCESS软件作为产品数据库。根据产品数据模式，建立一个实用的阀门图形与数据的计算机管理系统，帮助用户正确使用阀门产品，为计算机辅助设计提供支持。     

对加强我国灌排基础设施建设的思考

我国的灌溉排水基础设施抗御旱涝灾害的能力弱，与“适时适量”的供水要求、农业结构调整的要求和农业节水的要求有很大差距，已经成为制约农村经济发展和农民增收的重要因素。通过讨论灌溉排水基础设施在全面建设小康社会中的作用，分析了加强灌排基础设施建设对农业和经济社会可持续发展的影响，提出了加强灌排基础设施建设的建议。     

文脉中的环节建筑

环节建筑产生于建筑与城市的内在联系之中，它将“文脉”的含义拓展到基地、城市公共空间体系和城市职能等领域。阐述了环节建筑的基本概念，在此基础上分析了环节建筑在上述三个领域中所扮演的角色及其相互关系。     

Effects of modeling means on properties of monitoring models of spot welding quality

Analyzing and modeling the relation between monitoring information during welding and quality information of the joints is the foundation of monitoring resistance spot welding quality. According to the means of modeling, the known models can be divided into three large categories: single linear regression models, multiple linear regression models and multiple non-linear models. By modeling the relations between dynamic resistance information and welding quality parameters with different means, this paper analyzes effects of modeling means on performances of monitoring models of resistance spot welding quality. From the test results, the following conclusions can be drawn: By comparison with two other kinds of models, artificial neural network (ANN) model can describe non-linear and high coupling relationship between monitoring information and quality information more reasonably, improve performance of monitoring model remarkably, and make the estimated values of welding quality parameters more accurate and reliable.     

Effects of modeling means on properties of monitoring models o spot welding quality

Analyzing and modeling the relation between monitoring information during welding and quality information of the joints is the foundation of monitoring resistance spot welding quality.According to the means of modeling,the known models can be divided into three large categories:single linear regression models,multiple linear regression models and multiple nonlinear models.By modeling the relations between dynamic resistance information and welding quality parameters with different means,this paper analyzes effects of modeling means on performances of monitoring models of resistance spot welding quality. From the test results,the following conclustons can be drawn:By comparison with two other kinds of models,artificial neural network(ANN) model can describe non-linear and high coupling relationship between monitoring information and quality information more reasonably,improve performance of monitoring model remarkably,and make the estimated values of welding quality parameters more accurate and reliable.     

铸铁散热器表面对散热能力影响的研究

我国铸铁散热器一直沿用银粉漆为表面涂料,为改善铸铁散热器的热工品质,节约能耗,我们开展了对各种不同涂料表面铸铁散热器的标准散热量的研究。通过对样片的实验分析可知,表面辐射放热约占表面总放热量的四分之一,而且,非金属涂料表面的辐射放热能力比银粉漆表面提高一倍以上。基础研究表明,热辐射是红外辐射,其辐射能力取决于表面法向黑度的大小,而银粉漆表面法向黑度最小,铸铁自然表面次之,而非金属涂料表面的法向黑度最大。