OPTIMIZATION OF MARINE FISH DRYING USING SOLAR TUNNEL DRYER

Studies were conducted to optimize fish-drying process in a Hohenheim-type solar tunnel dryer to produce safe and high quality dried fish products. Five commercially important tropical marine fish species in the Bay of Bengal such as silver jew fish, Bombay duck, big-eye tuna, Chinese pomfret and ribbon fish were used and drying was performed at 45 to 50 and 50 to 55C temperature ranges. Moisture content of the fish samples reached 16% after 36 and 32 h of drying at temperature ranges of 45 to 50 and 50 to 55C, respectively. Products produced at 45 to 50C were found to be excellent on the basis of flavor, color and texture. Their rehydration ability ranged from 65 to 80% with minimum in big-eye tuna and maximum in silver jew fish. Values of total volatile base, peroxide and aerobic plate count of all the final dried products were within the acceptable limit.

PRACTICAL APPLICATIONS

In this experiment, we optimized the drying process in a Hohenheim-type solar tunnel dryer, constructed using locally available materials, for several commercially important marine fish species in the Bay of Bengal over a wide range of temperature, humidity and moisture content. The data obtained in this study are now successfully used for large-scale production of dried fish of high quality, providing better market price for its producers as well as greater acceptability to the consumers. We also developed another low cost solar tunnel dryer using bamboo, hemp, canvas, rope and polythene sheets, which became very popular among small-scale dry fish producers in the coastal areas of Bangladesh.     

随Zeta电位变化的微通道中Casson流体电渗流的解析解

本文提出了Casson流体在非均匀带电微通道中电渗透流动的解析解。目标是确定微通道剪切和非剪切区域速度和体积流量的解析表达,并描述这些区域的压力和温度分布。利用渐近逼近法将Casson流体流动的控制方程简化为无量纲形式,然后对其进行解析求解。使用余弦函数解析表达了剪切和非剪切区域的速度和体积流量。用图形表示了剪切和非剪切区域的压力、速度、流量和温度分布。结果表明,由于压力梯度和体积流量与其他参数的响应相反,随着压力梯度的上升,体积流量发生变化。此外,图示了壁形振幅和焦耳加热下的温度分布。本文结果对使用Casson流体微流控装置的各种应用中的设计和优化具有重要意义。     

顺应便携式医疗保健应用的需求

两种趋势影响着医疗和工业设备设计人员:一是便携性,二是此类设备越来越多地用于消费和实验室应用。血糖监控仪、多参数血液分析仪、脉搏血氧仪、PH计和环境监控仪就是其中的例子,这些设备一度仅存在于