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不冻液冻结乌鳢块冻藏过程中品质变化 总被引:1,自引:0,他引:1
为了研究不冻液冻结对乌鳢块冻藏过程中冰晶及品质的影响,采用不同冻结温度(-20、-30、-40 ℃)的不冻液和空气冻结乌鳢块,以冰晶大小、盐溶性蛋白含量、pH值、挥发性盐基氮(total volatile basic nitrogen,TVB-N)含量、硫代巴比妥酸(thiobarbituric acid,TBA)值和持水性等为指标,考察了乌鳢块冻藏(-18 ℃)过程中的品质变化。结果表明:采用-20、-30、-40 ℃不冻液冻结的乌鳢块通过最大冰晶生成带的时间分别为310、226 s和125 s,生成冰晶的面积分别为308.8、142.4 μm2和86.5 μm2,分别显著短于和小于空气冻结方式下乌鳢块通过最大冰晶生成带的时间(3 412 s)和生成冰晶的面积(939.6 μm2 )(P<0.05)。另外,在-18 ℃冻藏过程中,经不冻液冻结的乌鳢块的盐溶性蛋白含量均明显高于空气冻结组,而形成冰晶大小、pH值、TBA值、TVB-N含量、汁液流失率和蒸煮损失率均明显低于空气冻结组,其中-40 ℃不冻液冻结后的乌鳢块在冻藏过程中品质变化最小。综合以上结果,不冻液冻结比空气冻结能够更好地保持冻藏过程中乌鳢块的品质,且不冻液的冻结温度越低,冻结速率越高,形成冰晶越小,越有利于鱼肉品质的保持。 相似文献
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本文讨论了通过测量泄漏电流确定金属氧化锌避雷器绝缘状况的几种方法.提出了一种通过GPS时间同步方式采样氧化锌避雷器泄漏新方法,计算出金属氧化锌避雷器的阻性电流和功率损耗. 相似文献
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以某飞灰为对象,研究了石英、玻粉等添加剂及其添加量、温度以及混料方式对飞灰熔渣物相结构转变的影响。结果表明,添加30%~35%石英、55%~75%玻粉能稳定获得玻璃体熔渣。当硅源不足时,熔渣晶相主要为钙铝石及钙铝黄长石。随着温度升高,熔渣晶相由单[SiO_4]结构的硅酸盐向多[SiO_4]结构硅酸盐转变,直至形成以[Si-O]为主要骨架的玻璃体网络结构,1 400℃即能实现熔融玻璃化。混料方式对熔渣玻璃体的形成无影响,均能获得完好玻璃体熔渣产物。重金属浸出毒性表明,玻璃态熔渣重金属浸出极低,远低于国标限值,熔融玻璃化能够实现飞灰安全处置。 相似文献
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The experiment was carried out in a cylindrical dielectric barrier discharge(DBD)reactor assisted with a catalyst to decompose toluene under different humidity.In order to explore the synergistic effect on removing toluene in the catalysis-DBD reactor,this paper investigated the decomposition efficiency and the energy consumption in the catalysis-DBD and the non-catalyst DBD reactors under different humidity.The results showed that the catalysis-DBD reactor had a better performance than the non-catalysis one at the humidity ratio of 0.4%,and the removal efficiency of toluene could reach 88.6% in the catalysis-DBD reactor,while it was only 59.9% in the non-catalytic reactor.However,there was no significant difference in the removal efficiency of toluene between the two reactors when the humidities were 1.2% and 2.4%.Additionally,the degradation products were also analyzed in order to gain a better understanding of the mechanism of decomposing toluene in a catalysis-DBD reactor. 相似文献
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生活垃圾焚烧技术目前在国内发展迅速,相应产生了大量急需无害化处理的危险废物--焚烧飞灰。飞灰熔融玻璃化技术具有减容大、资源化等特点,目前受到广泛关注和研究。同时,常规粉体飞灰处理过程存在的扬尘等问题,也亟待解决。本论文分析了飞灰高静压压制的过程,压制压强为50~100 MPa时,压制效率较高,此时飞灰密度增加率、减容比均可达60%。考察了含水率对压制成形的影响,研究发现低于15%的含水率能够保证压制过程平稳和压坯顺利成形。飞灰压制预处理-熔融实验表明,其减量率、熔渣玻璃体含量、重金属挥发特性、熔渣重金属浸出毒性等指标均与常规飞灰熔融过程无显著差异,熔融处置效果达到稳定化、无害化要求,这为飞灰压制预处理-熔融处置提供了技术支撑。 相似文献
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The destruction of gaseous styrene was studied using a low-temperature plasma induced by tubular multilayer dielectric barrier discharge(DBD).The results indicate that the applied voltage,gas flow rate,inlet styrene concentration and reactor configuration play important roles in styrene removal efficiency(η_(styrene)) and energy yield(EY).Values of η_(styrene) and EY reached 96%and 15567 mg/kWh when the applied voltage,gas flow rate,inlet styrene concentration and layers of quartz tubes were set at 10.8 kV,5.0 m/s,229 mg/m~3 and 5 layers,respectively.A qualitative analysis of the byproducts and a detailed discussion of the reaction mechanism are also presented.The results could facilitate industrial applications of the new DBD reactor for waste gas treatment. 相似文献
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随着自动驾驶、智能网联汽车和智能交通系统的发展,车联网的应用场景也越来越丰富。本文经过循序渐进地分析,提出软件定义云边端协同一体化车联网架构。为了适应车联网的高移动性、实时性、流量剧烈增减和网络异构等特点,提出基于KubeEdge框架的车联网系统管理架构,并系统介绍KubeEdge的组成和云边消息传递机制。该架构将Docker容器、Kubernetes与车载智能设备、路边智能设备相结合,并对KubeEdge框架的云端、边端和云边端消息传递进行“本土化”改造,可作为车联网未来发展思路和路径之一。 相似文献