Moisture sorption characteristics and glass transition temperature of apple puree powder

The aim of this study was to characterise the influence of different foam‐mat‐drying methods on the moisture sorption characteristics and glass transition temperatures of apple puree powder. Apple puree was foamed with the addition of 2.5% egg albumin and 0.5% methylcellulose. Convective air‐drying and microwave‐drying techniques were used. Also foamed puree with and without maltodextrin (6% or 15% w/w) was freeze‐dried. Moisture equilibrium data of powders were determined by using a static desiccator method in a water activity range of 0.0–0.903. Modulated differential scanning calorimetry (MDSC) was used to obtain the glass transition temperature. No effect of drying method on sorption properties and glass transition temperatures of apple puree powders was observed. The addition of maltodextrin to the apple puree caused an increase in T_g by 10–30 °C depending on the amount of incorporated additive. Addition of maltodextrin significantly reduced the hygroscopicity of apple puree powders.     

连续玻纤毡增强热塑性复合材料在汽车工业中的应用

介绍了玻璃纤维毡增强聚丙烯及其它热塑性塑料(GMT,GlassMatReinforcedThermoplastics)材料在汽车工业中的应用情况。重点介绍了在发动机罩、前端托架、仪表板骨架、座椅骨架、电池托架等部件的研究开发工作。     

浅埋软弱围岩隧洞施工中锚喷网支护技术

以宜昌市黄家湾垃圾处理场排洪洞为例，介绍了锚喷网支护技术在浅埋软弱围岩隧洞施工中的应用，并通过监测，表明锚喷网支护能最大限度地发挥围岩的自承能力、变被动支护为主动支护，从而保证隧洞围岩的稳定和工程施工正常进行。     

厂区变电站接地网的设计与改进

随着生产的发展,厂区变电站出现小型化趋势,其接地网的面积大大缩小,而由于电网规模的不断扩大,系统短路电流越来越大,对接地网的设计提出了新的要求。文章对厂区变电站建设中面临的问题进行了分析,针对上海石化股份有限公司厂区电网的特点,对接地网形式、接地体的选择及跨步电势的降低提出了建议,还对变电站避雷带接地方案、与厂区建筑相结合的变电站的接地方法以及二次设备的接地方法进行了探讨。     

短墩-簿筏基础基底压力测试与共同工作分析

本文根据沈阳某大楼基底压力原位测试的结果,分析了短墩-薄筏基础共同工作机理和荷载传递规律,并推导出短墩-薄筏基础荷载分配比计算公式,供工程设计参考.     

微生物白云岩形成机制研究进展与存在问题

近年来,有关微生物白云岩沉淀作用机制的研究拓宽了沉积学中"白云岩问题"研究的视角。硫酸盐还原反应、产甲烷作用、有机分子水解等一系列可促进沉淀白云石的微生物代谢机制的发现,延伸了微生物白云石(岩)形成模式;有关可溶解硫化物催化白云石沉淀的研究,不但强调了硫酸盐还原反应机制,也为重新认识硫酸盐还原反应促进白云石沉淀机理提供了新线索。在现代环境中,微生物席内的原生白云石沉淀的发现,将微生物过程引入地表环境原生白云石沉淀作用和机理的研究,可能为寻找地层记录中的微生物白云石提供了更多有益的工作手段和思考途径。然而更加复杂的白云岩地层记录说明,运用微生物白云石去解释复杂的地质记录还存在着较多的局限性。     

垫铁安装调平工艺的改进及应用

垫铁安装是设备安装找正调平的关键工序,其安装质量在很大程度上决定了设备安装质量。对常规垫铁安装工艺存在的问题进行了分析,发现了诸多弊端,于是通过实验研究,对垫铁安装工艺进行了改进,不仅提高了设备安装质量,而且提高了劳动生产率,加快了施工进度,为会泽铅锌技改工程设备安装质量、进度控制取到了积极作用。     

关于建筑混凝土空心砌块施工技术的探讨

混凝土空心砌块在工程中应用中越来越广泛,本文对砌块使用问题进行了说明。并结合一个工程实例,介绍了施工中应该注意的问题,希望对同行们的工作有借鉴意义。     

新疆某隔震结构的地震反应分析

本文通过对新疆某学校教学楼的时程分析,比较了其在不同地震波作用下的层间地震剪力。通过隔震与非隔震建筑的实例对比,指出了隔震结构在地震作用下的优势。并对隔震结构的设计要点进行了阐述,对于其他类似的隔震建筑设计有一定的借鉴意义。     

DNA sequence of the mat2,3 region of Schizosaccharomyces kambucha shares high homology with the corresponding sequence from Sz. pombe

To define conserved sequences for mat1 imprinting and silencing of the mat2,3 region of Schizosaccharomyces pombe, we determined the DNA sequence of the cognate region (mat2,3 region) of another fission yeast, Sz. kambucha, a yeast species isolated from Kambucha tea mix. The entire mat2,3 region shows more than 98% identity between the two species. Sequence similarity is even higher (99.3%) for mating-type cassettes; deduced amino acid sequences of three of the four Mat peptides (Pi, Pc and Mi) are identical between the two species, while the fourth (Mc) has a single amino acid polymorphism. Comparison of the sequence motif of the imprint site essential for mat1 switching shows that mat-P of Sz. kambucha has a sequence identical to the conserved motif present in Sz. pombe. However, this sequence motif of nine bases differs by one base for mat-M of Sz. kambucha. The sequence of the K region shows about 98% identity between the two species, with the cenH region showing 98.3% homology. Thus, the arrangement of the mat2,3 region in both yeasts is conserved and shows 1-2% nucleotide sequence variation throughout the region. The DNA sequence of the mat2,3 region from Sz. kambucha has been submitted to GenBank under Accession No. AY271822.