低糖莲子蛋糕的研制

以低筋面粉、莲子粉为主要原料,鸡蛋为辅料,木糖醇、白砂糖、蛋糕粉为主要添加剂,对莲子蛋糕的加工工艺进行优化。在单因素试验的基础上,进行正交试验,结合感官评价方法,研究确定低糖莲子蛋糕的最佳配方工艺为:低筋面粉90 g,莲子粉30 g,木糖醇100 g,白砂糖60 g,鸡蛋300 g,大豆油20 g,上火180℃,下火150℃,烘烤20 min。     

高膳食纤维濑粉工艺及特性研究

为研究高膳食纤维濑粉的最佳工艺,本试验以大米粉和玉米粉为主要原料,菊粉和魔芋胶为辅料,通过单因素试验和正交试验对濑粉配方进行优化。结果表明,高膳食纤维濑粉的工艺参数为大米粉∶玉米粉=1∶4、菊粉添加量6.5%、魔芋胶添加量2%,测定最优组的濑粉与纯大米制作的濑粉的理化指标,经比较得出高膳食纤维濑粉的品质更佳。     

真空低温烹饪甜皮鸭工艺优化研究

为推动真空低温烹饪技术在甜皮鸭生产工艺中的应用,本研究以传统甜皮鸭生产工艺为基础,结合现代低温烹饪技术,通过单因素实验与正交实验对其工艺进行优化。最终确定低温烹饪甜皮鸭最佳工艺参数:慢煮温度为75℃,慢煮时间为50 min,油炸温度为150℃,油炸时间为1.0 min。本研究为低温烹饪甜皮鸭生产提供理论参考,同时也为低温烹饪技术在其他产品生产中的应用提供借鉴。     

闽东地区年可利用降水资源时空特征分析

文章利用闽东地区9县市区1969~2014年月平均气温和月降水资料,应用桑斯维特法计算年蒸散量,从而求出年可利用降水量。利用线性倾向估计法分析年降水量和年蒸散量的变化趋势,结果表明:46年来闽东地区年降水量呈不显著的增多趋势,西北部山区降水多于东南部沿海;而年蒸散量呈显著的增大趋势,东南部沿海蒸散能力大于西北部山区。对近46年闽东9县市区年可利用降水量场进行经验正交分解(EOF),通过显著性检验的3个主要特征向量和所对应的时间系数代表了闽东地区年可利用降水资源的时空变化特征,结果表明,第一模态(占总方差贡献的97.61%)显示闽东地区年可利用降水资源最主要的分布特征,呈现西北部山区向东南部沿海递减的空间特点,即内陆山区可利用降水资源比沿海更为充沛,在时间上呈略增变化趋势;第二模态(占总方差的0.96%)反映出闽东东部与西部县市呈现反相变化的分布特征,近46年发生东多西少的频率略高于东少西多,但不显著;第三模态(占总方差的0.58%)反映出北部与南部县市呈反相变化的分布特征,近46年发生北多南少的频率较高于北少南多。闽东地区年可利用降水资源具有典型的西北向东南递减的全区域型分布加上东西型、南北型两种扰动分布的空间特点。     

用磷酸法制备玉米秸杆活性炭的研究

介绍了以玉米秸杆为原料，用磷酸法生产活性炭的方法。用正交试验法考察了影响玉米秸杆制活性炭之亚甲蓝脱色力的因素，提出了制备玉米秸杆活性发适宜的工艺条件。制得的玉米秸杆活性炭之亚甲蓝脱色力最高可达16ml／0．1g。     

Interstate switched access demand analysis

The breakup of the Bell System in 1984 led to the adoption by the Federal Communications Commission of a system of tariff charges that are paid to local exchange carriers by business and residential telephone subscribers, and interexchange carriers such as AT&T. These charges are designed to recover the costs associated with providing access to the public switched network to complete interstate calls. This system is known as the FCC Access Charge Plan. Flat-rate fees, named Subscriber Line Charges, are imposed on telephone subscribers, while usage-based charges are billed to interexchange carriers. These are called Carrier Common Line and Traffic Sensitive rates. Since CCL and TS rates are based on network usage, forecasts of switched access demand are required to set them properly.This paper presents an econometric model of interstate switched access demand developed and utilized by AT&T to produce forecasts of 1988 demand in connection with the Annual 1988 Access Tariff Filings. The model is estimated in a state-level pooled cross-sectional time-series framework, with dynamics introduced via polynomial distributed lags on price and income. It represents an extension of the econometric demand model developed and used by the FCC a year earlier to determine a reasonable forecast of 1987 Carrier Common Line switched access demand. Estimated demand elasticities and forecasts are provided. The model forecasts are also compared to those from other models.     

On third order rotatability

Third order rotatability of experimental designs, moment matrices and information surfaces is investigated, using a Kronecker power representation. This representation complicates the model but greatly simplifies the theoretical development, and throws light on difficulties experienced in some previous work. Third order rotatability is shown to be characterized by the finitely many transformations consisting of permutations and a bi-axial 45 degree rotation, and the space of rotatable third order symmetric matrices is shown to be of dimension 20, independent of the number of factorsm. A general Moore-Penrose inverse of a third order rotatable moment matrix is provided, leading to the information surface, and the corresponding optimality results are discussed. After a brief literature review, extensions to higher order models, the connections with tensor representations of classic matrix groups, and the evaluation of a general dimension formula, are all explored.     

Credibility estimators with dependence structure over risks and time under balanced loss function

In this paper, we study the Bühlmann credibility model with constant interest rate and equal dependence structure over risks and time under balanced loss function. By means of orthogonal projection, the inhomogeneous and homogeneous credibility premium estimators are derived, which extend those for the existing models to slightly more general versions. Finally, we investigate the estimation of the structure parameters and present a numerical example to show the effectiveness of the inhomogeneous estimator.     

用正交试验法提高球磨效率的研究

本研究采用正交试验法合理地设计试验方案,经试验研究,从影响球磨效率的诸因素中,确定了主要因素,即料、球、水的最佳配比的最佳球磨时间.     

技术进步促进经济增长问题研究的新思路与新方法

文章对已有的技术进步促进经济增长问题的研究方法进行了评述，指出了已有的经济增长问题研究方法的局限性。文章指出，在研究经济增长问题时，不应把眼光和精力放在测算技术进步对经济增长的贡献上，而应研究各因素之间的关系、交互作用及其对经济增长的影响。提出上述观点和方法的目的是使经济效益最大，而不是使经济增长最大，更不是为了将技术进步从经济增长中分离出来。按照上述观点，文章提出了相应的研究经济增长问题的新思路，并且提出了为了研究各因素之间的关系、交互作用及其对经济增长的影响，应运用正交设计法。