低铬白口铸铁的组织与磨粒磨损性能

采用硅进行低铬白口铸铁的合金化，试验发现，随着硅含量增加，碳化物形貌由网状向断网状、分散孤立的条状转变；碳化物的含量增加，尺寸细化；碳化物硬度及材料的整体硬度也逐渐增加。在铬含量为59／5左右、硅含量〉2．5％时，碳化物出现了M7C3型，耐磨性也随着增加，该材料的抗冲击磨粒磨损性能最好的是下贝氏体组织。淬火温度和冷却方式对该类白口铸铁的抗冲击磨粒磨损性能影响不大。     

修正Hausdorff距离在工程图纸预处理中的应用研究

针对图纸以位图形式存储时在图纸检索前需解决的问题,提出了对扫描图纸进行相应的预处理工作,主要包括图纸的坐标变换、图纸特征抽取等。采用改进的Hausdorff距离方法调整图纸位置,实现图纸坐标变换。同时基于MPEG-7规范给出了图纸的存储表示方法,实现图纸基本信息及其特征信息的统一表示,方便了基于关键字及内容的图纸检索。     

烹调加热对蔬菜中总多酚含量的影响

对扬州常见的8种蔬菜,以微波、煮、爆炒3种烹调方法处理,采用Folin-Ciocalteu法测定其烹调前后总多酚含量,比较不同烹调方法对蔬菜中总多酚含量的影响。结果表明：煮使蔬菜中总多酚含量明显下降,微波及爆炒影响较小。     

淮南市山南新区土壤中镍含量分布特征及评价

为给追踪研究淮南市山南新区土壤城市化后重金属镍含量的变化提供基础数据,对该区进行了布点,采集了不同深度的土壤样品,使用盐酸、硝酸、氢氟酸及高氯酸对土壤样品进行消解,用火焰原子吸收法对土壤中重金属镍的含量进行了检测。在对检测结果进行统计分析的基础上,采用多种方法对淮南市山南新区土壤中的镍进行了环境质量评价。     

Growth Hormone Secretagogue (A233) Improves Growth and Changes the Tissue Fatty Acid Profile in Juvenile Tilapia (Oreochromis niloticus)

Growth hormone (GH) release is a process that is well regulated by several factors, including GH secretagogues. GH can mediate the regulation of the fatty acid level and composition. The aim of this study was to determine the effect of a synthetic GH secretagogue peptide (A233) on the growth and fatty acid composition in tilapia (Oreochromis niloticus). To address this objective, we administrated a diet supplemented with A233 to juvenile tilapia for 60 days. The group fed with a diet supplemented with 600 μg of A233 per kg of feed increased in weight (4.81 ± 0.09 g) and specific growth rate (2.49 ± 0.03%/day) compared to the control diet group (3.63 ± 0.08 g, 2.07 ± 0.04%/day; respectively) (p < 0.001). In the muscle, the total lipids for the control diet group were higher than that in the group fed with 600 μg of A233 per kg feed; however, no differences were detected in the liver. In both tissues, the patterns of fatty acid composition and content were generally similar, with some exceptions. Tilapia fed with 600 μg of A233 per kg of feed showed, in liver and muscle, a significantly higher composition and content of n‐3 polyunsaturated fatty acids (such as 20:5n‐3, 22:5n‐3, 22:6n‐3) and n‐3/n‐6 PUFA than animals fed with the control diet. To our knowledge, this is the first report on the the effects of natural or synthetic GH secretagogues (GHS) on fatty acid composition, implying an increase in the nutritional quality of the tilapia.     

福塔纤维沥青混合料马歇尔试验

福塔纤维（FORTA（r）AR）是一种新型的聚合物有机纤维，它由聚丙烯纤维（Polypropylene）和芳纶纤维（Kevkar）按照质量比3：1混合而成。首先，对福塔纤维沥青混合料的拌和工艺进行了研究；其次，选择了4个福塔纤维掺量（0％、0．023％、0．045％和0．068％），并针对每个掺量分别进行了马歇尔试验，确定了不同纤维掺量下的最佳油石比；最后，在最佳油石比下对四种纤维沥青混合料进行了车辙试验，结合马歇尔试验最终确定了最佳纤维掺量。     

新编《屋面工程技术规范》的特点和主要内容

回顾了我国屋面工程技术标准制定的历史．介绍了新编《屋面工程技术规范》（报批稿)的特点和主要内容，以指导我国屋面工程的设计和施工。     

Amount of training and cue-evoked taste-reactivity responding in reinforcer devaluation.

In two experiments, rats received minimal (16) pairings of one auditory conditioned stimulus (CS) cue with a sucrose reinforcer, and extensive (112) pairings of another auditory CS with that reinforcer. After sucrose was devalued by pairing it with lithium chloride in some rats (Devalue groups) but not others (Maintain groups), taste reactivity (TR) and other responses to unflavored water were assessed in the presence of the auditory CSs alone. The minimally trained CS controlled substantially more evaluative TR responses than the extensively trained CS. Those TR responses were hedonic (positive) in the Maintain groups, but aversive (negative) in the Devalue groups. By contrast, food cup entry and other responses thought not to reflect evaluative taste processing were controlled more by the extensively trained cue. These responses were reduced by sucrose devaluation comparably, regardless of the amount of training. The results suggest rapid changes in the content of learning as conditioning proceeds. Early in training, CSs may be capable of activating preevaluative processing of an absent food reinforcer that includes information about its palatability, but that capability is lost as training proceeds. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

网络内容管制与我国政治文化发展

互联网的兴起和我国网民人数的爆炸性增长,为我国公民参政议政、监督政府、管理社会事务提供了一个全新的公共空间,而直接关系到互联网用户所接触到信息的网络内容管制必然对我国政治文化发生重大的影响。本文阐述了我国加强网络内容管制对引导政治文化健康发展的必要性,分析了现行网络内容管制法规对政治文化可能产生的不良影响,并提出了改进网络内容管制、促进我国政治文化进一步民主化、现代化的对策建议。     

干制牛蹄筋的低压涨发新工艺研究

以干制牛蹄筋为研究对象,在低压环境下进行涨发处理,探究压力值、保压时间、保压温度对干制牛蹄筋涨发率的影响。利用响应面分析得到低压环境下牛蹄筋的最佳涨发工艺参数为:压力值(X1)0.5bar,保压时间(X2)103min,保压温度(X3)82℃,干制牛蹄筋的涨发率(Y)高达386.90%。在最佳工艺条件下对干制牛蹄筋进行涨发处理,并与高压涨发比较对牛蹄筋品质指标的影响。结果表明,低压涨发有利于减缓牛蹄筋中蛋白质、脂肪、胶原蛋白含量的降低,但对钙含量无显著影响(P>0.05)。同时,低压涨发牛蹄筋的水分含量显著大于高压涨发(P<0.05),可更好保证牛蹄筋的多汁性。相比常压与高压涨发,低压涨发牛蹄筋的感官评分最高,显示低压涨发工艺可在保证牛蹄筋感官品质的前提下,有效维持其营养成分。