气调贮运摆放位置对荔枝保鲜品质的影响

为研究保鲜气调运输厢体内荔枝不同摆放位置对保鲜品质的影响,采用果蔬气调保鲜运输试验平台对"淮枝"荔枝进行气调贮藏。隔7 d对不同摆放位置的荔枝样品进行测试,测试指标为果皮褐变指数、质量损失率、果皮色差值、可滴定酸以及可溶性固形物含量,并结合厢体内的温度场、湿度场进行分析。试验结果表明:在贮藏期内,厢体内温度呈前低后高、上低下高分布;而相对湿度呈前高后低、上低下高分布。不同纵向摆放位置对无包装荔枝的果皮褐变指数、质量损失率影响较大,质量损失率自上而下逐步减小;处于厢体后部的荔枝的可滴定酸含量较前部和中部的荔枝要高;处于厢体中部的荔枝的可溶性固形物含量要比前、后部的荔枝低。本研究结果为果蔬贮运保鲜提供一定的参考。     

液氮充注气调对运输厢体内流场均匀性的影响

为了掌握液氮充注气调对厢体内流场的影响,搭建液氮充注气调试验平台,研究不同汽化器的翅片间距、回风道风速和初始温度条件下厢体内的温度场和相对湿度场的均匀性变化。结果表明,翅片间距对厢体内的温度场及相对湿度场的均匀性有一定影响,翅片间距为7 mm时均匀性相对较好,翅片间距为4 mm时均匀性相对较差;回风道风速越大,厢体内温度场的均匀性越好,相对湿度场均匀性越差;初始温度越高,温度场和相对湿度场越均匀。研究结果为气调保鲜装备的进一步开发提供了参考依据。     

真空绝热板覆盖率对冷藏厢体内部温度场特性的影响

采用嵌套真空绝热板结构制作隔热壁板的冷藏厢体具有绝热性能优越、热导率低和节能效果明显的特点。考虑到嵌入不同覆盖率嵌套的真空绝热板,对冷藏厢体内部温度场特性的影响,利用计算流体力学方法,对试验冷藏厢体内部的温度场进行数值模拟,分析了VIPs不同覆盖率厢体保温效果和内部温度场均匀性的变化规律,并进行了试验验证。结果表明:冷藏厢体壁板嵌入真空隔热材料可以提高厢体绝热保温效果,改善内部温度场的均匀性。在相同制冷量的情况下,随VIPs覆盖率的增加,厢内平均温差最高下降40%,厢内平均温降可增加43%。当覆盖率增加到大于66%时,厢体内温度场的均匀性趋于稳定。     

模拟运输条件下保鲜模式对菜心品质的影响

为掌握运输中气调保鲜、冷藏加湿保鲜和冷藏保鲜3种保鲜模式对菜心品质的影响,以多保鲜模式果蔬运输箱为试验平台进行菜心保鲜运输试验。结果表明,对于2d以内的运输,3种保鲜模式菜心品质整体无显著性差异(P0.05),均可以维持菜心较好的品质;对于2d以上的运输,气调保鲜和冷藏加湿保鲜模式可以显著地(P0.05)抑制菜心失水和茎切口腐烂,而对于抑制TSS、VC等营养物质分解的作用不明显;4d以上的运输,气调保鲜和冷藏加湿保鲜模式菜心品质差别不大且明显优于冷藏保鲜模式。整体而言,对于4d以内的菜心运输可以选择气调保鲜、冷藏加湿保鲜和冷藏保鲜3种保鲜模式中的一种,而对于4d以上的菜心运输选择气调或冷藏加湿保鲜为宜。     

马水桔常温臭氧加湿贮藏保鲜研究

采用超声波加湿及臭氧气体处理,研究马水桔果实的常温贮藏保鲜效果.结果表明:在常温(13.8～25.7℃)下经过45 d的贮藏后,超声波加湿(相对湿度80%～85%)、臭氧(浓度5～20 mg/m3)及不套袋处理(A)的马水桔病烂率最低,主要营养成分损失及乙醇含量最少,果皮平滑、色泽金黄油亮,果肉清甜爽口、无异味,综合贮藏保鲜效果最好.     

曲房加湿的数值模拟及试验

传统曲房通过人工开关门窗和向曲房内撒水的方法来调节曲房内相对湿度,受自然环境的影响,很难保证不同位置大曲质量等级一致。需要掌握曲房内加湿装置对曲块发酵过程中湿度调控的变化规律,实现曲房内相对湿度的实时调控。基于曲房三维紊流模型,以曲房加湿过程中的相对湿度为研究对象,结合多孔介质模型及组分传输模型,运用Fluent软件对曲房加湿过程进行数值模拟,同时结合现有曲房加湿试验平台对曲房模拟模型进行验证。加湿过程中相对湿度模拟值和试验值最大偏差为1.1%,加湿时间仅相差6.5 s,验证曲房加湿模型的有效性。通过试验研究加湿管道直径、开孔数和开孔尺寸对曲房加湿效果的影响,使用单因素和正交试验法筛选出加湿装置参数的最优组合。结果表明：当管道直径为80 mm、开孔数为6、开孔直径为30 mm,曲房加湿效果最好,与优化前的加湿装置相比,优化控制参数后的加湿装置的加湿时间缩短了6.6%,为后续曲房湿度控制研究提供了模型参考和理论数据支撑。     

苹果气调贮藏湿环境影响因素的研究

以某苹果气调贮藏技术研究中心的1#气调库为研究对象,采用k-ε紊流模型建立了苹果气调库内气体流动、传热与传质的三维数学求解模型。研究了冷风机送风速度、送风温度和加湿装置对库内湿环境的影响。结果表明:送风温度对库内相对湿度有显著的影响,随着送风温度的降低,库内相对湿度明显增大;增大送风速度,气调库湿度梯度变小,货物区内湿度变大;在没有任何加湿装置时,气体区的湿度梯度明显大于货物区,库内大部分区域相对湿度为85%~90%,达不到苹果气调贮藏适宜的湿环境。综合考虑苹果气调贮藏适宜的湿环境,对于该气调库,在送风温度273 K,送风速度为5 m/s,采用加湿装置对库内加湿时,可以明显改善其湿环境,这对降低苹果干耗损失有重要意义。     

冷藏集装箱内部流场的动态数值模拟与验证

冷藏集装箱流场的均匀性是影响食品储存质量的重要因素之一。通过CFD建立三维非稳态模型,利用FLUENT软件对所建立的模型进行不同参数的模拟分析,讨论温度场、速度场以及货物堆码对冷藏集装箱流场的影响,进而得出结论:冷藏集装箱内的流场存在明显的不均匀性,箱体前部与后部的温度存在明显的波动,不利于货物的储存;送风速度以及货物堆码方式的改变都会影响箱内流体的分布情况,进而影响到换热效果;综合温度场与速度场以及食品储存,冷藏集装箱合理送风速度为5 m/s左右;四体式堆码方式优于其它两种堆码方式。验证实验中实测温度与模拟温度的平均偏差在1.1℃左右,两者偏差不大,说明所建立的模型适用于冷藏集装箱内流场的模拟。     

冷藏车行业领导者——冰熊——访河南冰熊专用车辆制造有限公司京津地区销售总经理马磊超

<正>提起冷藏车我们应该不会陌生,它们带着不同种类的箱体,匆忙穿梭于大街小巷。日常生活中很多货物的运输都是需要冷藏,因此人们便在运输车辆上安装了制冷设备,这便是冷藏车的由来。从专业角度来看,冷藏车是用来运输冷藏、冷冻或保鲜货物的封闭式厢式运输车,是装有制冷机组的制冷装置、聚氨酯隔热厢的冷藏专用运输汽车,常用于运输冷冻食品(冷冻车)、奶制品(奶品运     

冷藏运输车真空隔热厢体的温度场特性仿真研究

为提高冷藏运输车厢的隔热性能,设计一种聚氨酯嵌套真空隔热板复合结构,对比分析聚氨酯嵌套真空隔热板复合结构、全聚氨酯板的"Z"字型和"工"字型加强筋结构的热力学性能,对嵌套真空隔热板和全聚氨酯板的厢体进行温度场模拟仿真,研究真空隔热板在保温板中的不同嵌套位置对厢体隔热性能的影响。仿真结果表明:聚氨酯嵌套真空隔热板复合结构符合强度要求,可提高车厢的隔热性能,真空隔热板嵌入保温板中间,被聚氨酯形成良性包围的情况下更能充分发挥真空隔热板的隔热性能。     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of     

The Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the latest scientific     

Contamination of animal feed and food from animal origin with mineral oil hydrocarbons

Oils and fats used for the production of animal feed can become contaminated with mineral oil material originating from gas oils (C₁₈-C₃₅) or synthetic oils (poly alpha olefins, C₂₅ to beyond C₄₅). An important cause is assumed to be the discharge of waste oils, such as motor oil and hydraulic oils. Mineral oil material was analysed by on-line LC-GC-FID directly in the fat or in a raw extract from animal feed or foodstuffs. In Switzerland in summer/autumn 1999 concentrations in oils and fats for feed production were often found to be between 100 and 1000mg/kg. In the feeds, the average concentration was around 100mg/kg with values ranging up to a maximum of 1000mg/kg; few samples were free of contamination. In animal body fat, the average concentration determined in summer 1999 was 25mg/kg, with a maximum of 150mg/kg, although in samples from December 1999, contamination was substantially lower. In the fat phase of eggs, the average concentration was 30mg/kg, with a maximum of 80mg/kg. Paraffin oil is used for feed production, which may account for part of the contamination problem (e.g. eggs).