国外发酵肉制品微生物限量标准研究

研究了美国、加拿大、英国、爱尔兰等11个国家、地区和组织的发酵肉制品微生物限量标准、指引或规范特点,凝练出了发酵肉制品微生物指标选取和限量制定上的共性特征和规律,为制定我国发酵肉制品标准提供参考.对我国发酵肉制品微生物指标和限量的设定提出两点建议.     

葡萄糖添加量和保持时间对鸭肉熟制品中 WOF (Warmed-Over Flavor)异味调控效果的影响

鸭肉熟制品在冷藏后再次加热会产生 WOF(Warmed-Over Flavor)异味,为对异味进行抑制,在鸭肉加工的过程中添加还原性的葡萄糖和鸭肉中的蛋白质产生具有抗氧化性的美拉德反应产物,研究添加不同量的葡萄糖和不同的加工保持时间对 WOF 异味抑制效果的影响,采用气相色谱-质谱联用法测定鸭肉熟制品中己醛的相对百分含量,以己醛的相对百分含量作为衡量 WOF 异味程度的指标,并结合感官评价进行综合分析.结果表明:在鸭肉制品加工的过程中添加葡萄糖有抑制WOF 异味的作用,且随着葡萄糖添加量的增加抑制作用效果增加,加工保持时间对 WOF 异味的抑制效果也会产生影响,随着保持时间的延长抑制效果增加.随着葡萄糖添加量的增加及保持时间的延长会对鸭肉熟制品的口感和色泽产生不良影响,因此在加工中需进行综合分析     

鱼类肉质评价及影响因素研究进展

目前,有关鱼类肉质的评价标准还未确立,对肉质进行全面评估的研究还未见报道.本文对鱼类肉质研究内容和方法的研究现状以及影响鱼类肉质的因素作一综述,以期为进一步研究和评价鱼类肉质提供一定参考.     

发光二极管自动封装机注胶系统的控制

主要介绍了一种新型发光二极管(LED)自动封装机注胶系统的工作原理以及应用可编程控制器(PLC)和位控单元对其进行自动化的控制。该注胶系统具有操作方便、重复性好、注胶精度高,均匀性好,运行可靠等特点。     

仿生六足机器人的设计研究

对六足机器人的全方位步态进行了探讨,分析其机身的稳定性,爬坡能力、越沟能力等运动性能.采用的曲柄滑块机构,使其足部落足点的轨迹离散化,使其对地面具有良好的选择性.     

A cathodic arc enhanced middle-frequency magnetron sputter system for deposition of hard protective coatings

1Introduction Hard coating is a type of coating that includes metallic nitrides,metallic carbides,diamond,dia-mond-like carbon(DLC),and ceramic.These coatings can effectively reduce friction coefficients and wear rates of the workpieces and increase surface hardness,toughness,and resistance to chemical corrosion;hence,they are widely used as protective coatings on cutting tools and on wear-exposed components.[1-3]Plasma chemical vapor deposition(PCVD),magnetron sput-tering,and cathode arc d…     

Preparation technique of SiCp reinforced Al matrix composite

The advancement of modern technology in the areas of aerospace and automotive industries has generated demand for new engineering materials, leading to a rapid development of metal matrix composites (MMCs) [1]. These composites can be tailored to have outstanding mechanical and physical properties such as high specific strength and stiffness, increased wear resistance, enhanced high-temperature performance and better thermal, mechanical fatigue and creep resistance than those of monolithic mat…     

EFFECT OF Ti-ADDITION ON MECHANICAL ALLOYING OF NiAl

Mechanical alloying(MA)of Ni_(50)Ai_(45)Ti_5(atomic per cent)is studied by.situ thermalanalyses,XRD.and metallography.The results showed that the alloying process ofNi_(50)Al_(45)Ti_5 is similar to that of Ni_(500Al_(50).The addition of 5 at.%Ti prolongs the millingtime of alloy prior to the explosive reaction in the alloy.The final product.is nanocrystallineβ-phase NiAl(Ti)(B2 structure ).The addition of 5 at.% Ti shows little effect on the lattice parameter of β-phase.     

Sound absorption property of open-pore aluminum foams

This paper presents a study on sound absorption property of aluminum foam by evaluating its sound absorption coefficients using standing wave tube method. Experimental results showed that the average values of sound absorption coefficients (over the test frequency range) are all above 0.4, which indicate very good sound absorption property of the aluminum foams. The sound absorption coefficient is affected by frequency and pore structure, and reaches its maximum value at around 1 000 Hz. With the increase of porosity and decrease of cell diameter, the sound absorption coefficient values increase.