维生素的合理应用与饲料品质的改善

不论是屠体还是经过了进一步的加工,禽肉在贮藏过程中品质都要降低。尤其是高温条件下,生化反应加剧,损失更大。不少研究表明,增加日粮中 V·E 含量可以防止冷冻或新鲜肉脂肪的氧化,提高贮藏品质。日粮中 V·E含量在40mg/kg 或更高时,对于胴体肉、脂的味道有稳定作用.     

Comparison on Shrinkage Effects at Concrete Interfaces in Long Span Girder Bridges between Chinese and American Codes

Stress, due to shrinkage characteristic difference resulting from different concrete age at typical interface parts in long span rigid frame bridges, was analyzed based on Chinese and American codes. Reasons for large discrepancy between results under the two codes were also discussed. It was shown that shrinkage stress level calculated under AASHTO was more reasonable than that under Chinese code (JTGD 622004) for concrete members with large thickness. Concrete at interface parts was easy to crack when casting time interval was long. According to JTGD 622004, stress at interfaces was always small under different casting time intervals, while stress at position with mutation section was more significant. It was necessary to set an upper limit to theoretical thickness in JTGD 622004, and 300 mm was recommended. Finally, some design and construction approaches were put forward.     

非热等离子体杀菌技术研究进展

概述了非热等离子体的特点及分类,从紫外辐射、活性物质及带电粒子等方面分析了其杀菌机制,综述了影响其杀菌的因素及在纺织、环保、医疗及食品工业上的应用,阐述了等离子体杀菌技术的研究进展及展望。     

Development and Apllication of an Intergrated Emergency Lightening System for Water Pollutant Accident Management in the Three Gorges Basin

An integrated water pollution management system for the Three Gorges Reservior Area (TGRA) titled as WPMIS_ER_TGRA was developed as an information based techenical tool for emergency response on water pollutant accident.ArcGIS Engine, a Geographic Information System (GIS) Module Warehouse, was used as programme developing platform, and Visual Basic (VB) as programming language.The mathematical models for hydraulic and water quality simulation were developed and integrated in the system and programmed as a DLL file via VB.WPMIS_ER_TGRA owns a new function of emergency lightening at watershed scale as well as the normal water environmental information management functions.The system was applied for emergency water pollution management by a dummy ship capsizal in Yangtze River.It was found that WPMIS_ER_TGRA could model the transfer and diffusion of the accident pollutants in rivers, quickly forecast the pollution situation and identify the influencing area and their changing with time in a few minutes just after the accident happened.     

纯果肉型枇杷饮料的研制

以新鲜枇杷为原料,经二次超高压处理,不添加任何食品乳化稳定剂,依靠高压处理后形成的稳定体系,研制出具有营养、健康、保健作用的纯天然果肉混合型枇杷饮料。以感官评价为指标,采用L9(34)正交试验,得出最优工艺条件为:果肉与水的质量比为1∶1,糖酸比为100,固形物含量为10%~11%,制得的产品酸甜适合,色泽鲜亮,口感爽滑。     

H-NMR及其在鱼糜制品加工和保藏中的应用

核磁共振技术是一种利用原子核在磁场中的能量变化来获得关于核信息的技术,已广泛应用于物理、化学、生物、医学、地质、食品等各个领域。综述了核磁共振技术的基本原理,以及核磁共振技术在鱼糜的漂洗、擂溃、凝胶和保藏过程中的应用,扩展核磁共振技术在食品中的应用领域。     

非热杀菌技术在食品中的应用(1)

非热杀菌是当代一类崭新的技术,它既有利于保持食品功能成分的生理活性,又有利于保持原料的色、香、味及营养成分。介绍了超高压杀菌(UHP)、超高压脉冲电场杀菌(PEF)、脉冲强光杀菌(PSL)、微波杀菌(MW)、放射线杀菌(RADIATION)、臭氧杀菌(OZONE)、生物保藏(Bio-conserve)和膜分离(FilmSeparation)技术在食品中的应用及其发展现状。     

Effect Correction of the Cavity Geometry of a Resonant Silencer on the Resonance Frequency

A new connector end correction is presented on the basis of the three dimensional finite element results, which is for the lumped-parameter formula used to predict the resonance frequency of a silencer having various depths to width ratio of the cavity. The problems of the low accuracy are solved even no use for some cavity dimensions of the lumped-parameter formula.     

利用介质阻挡放电等离子体杀灭鲜榨果汁大肠杆菌

与传统热杀菌相比,非热杀菌能较大程度地保持食品中营养成分,节约能耗。为了进一步研究非热杀菌技术,利用自行设计的介质阻挡放电反应器（DBDR）,以鲜榨果汁为杀菌介质,研究了DBDR所产生的低温等离子体（LTP）的杀菌效果和对鲜榨果汁品质的影响。采用响应面法建立了介质阻挡放电等离子体（DBDP）杀灭鲜榨果汁饮料中大肠杆菌的二次多项数学模型,验证了模型的有效性,并探讨了循环次数、pH值、温度及电压对DBDP杀灭大肠杆菌的影响,优化出杀灭7个数量级大肠杆菌（E.coli）ATCC 8739的工艺参数为：循环次数6次,pH值 3.14,温度39.72℃,电压21.42 kV。为进一步研究DBDP的杀菌规律和探讨杀菌机理奠定了数学基础,同时,此模型的决定系数R2达到0.9817,可推广应用到其他果蔬汁的杀菌处理,提高鲜榨果蔬汁的品质和质量安全。