INSTRUCTIONS FOR PREPARATION OF MANUSCRIPTS FOR DIRECT REPRODUCTION

ABSTRACT

The bulk density of garlic slices at different moisture levels (ranging from approximately 3 to 65% MC wet basis) was determined by weighing the contents of a container of known volume. The porosity was calculated using its relationship with bulk and apparent densities. An analysis of variance (ANOVA) revealed that bulk density and porosity were affected significantly by moisture and slice thickness as well as the interaction of these variables. Bulk density varied in a positive linear fashion with moisture and thickness while a negative linear correlation was found for the calculated bulk porosity. The linear model met me adequacy criterion for characterising the behaviour of garlic. Using a laboratory unit, the vertical resistance to airflow through the product and die effect of moisture and slice thickness were investigated for an airflow rates of 0.09 to 1.2 m³/s-m². A higher resistance to airflow was noted for the wet product with the experimental data fitting to Shedd's model when the airflow range was divided into two sub-flow rates and to a modified Ergun's equation for the full range.     

INSTRUCTIONS FOR PREPARATION OF MANUSCRIPTS FOR DIRECT REPRODUCTION (REVISED, 1992)

ABSTRACT

A software for simulating the drying operation of diluted suspensions in conical spouted beds of inert particles has been developed. This computer program combines the fluid flow and the solids circulation models with the drying kinetic equations. The simulated results for drying animal blood in a spouted bed of inert particles compare with data reported in the literature.     

INSRUCTIONS FOR PREPARATION OF MANUSCRIPTS FOR DIRECT REPRODUCTION

ABSTRACT

We investigate experimentally the behaviour of the receding evaporation front during the drying of food products by measuring the temperature distribution profile within the potato slab. The effect of key process parameters on the receding speed of this evaporation front is investigated. We show that the square root of the drying time varies linearly with the transient position of the front. Also, the receding velocity of the front is seen to be related to the drying rate of the product as the front decelerates inward to the center of the material.     

直接沉淀法制备纳米ZnO粉体

以Zn（NO3）2·6H2O和ZnSO4·7H2O为锌源，以Na2CO3、（NH4）2CO3、NH3·H2O、NaOH作为沉淀剂，采用直接沉淀法制备了纳米氧化锌粉体。采用XRD和TEM测试手段对纳米氧化锌粉体进行了表征。结果表明：沉淀剂为Na2CO3时制备的纳米氧化锌粉体的晶体尺寸约为I5nm～40nm，浓度对纳米氧化锌粉体的粒径基本没有影响。在500℃煅烧2h后得到纳米氧化锌粉体具有六方纤锌矿结构。以（NH4）2CO3作沉淀剂，返滴定法制得的纳米氧化锌粉晶形完整、颗粒粒度分布较窄且粒径较小、分散性好。     

直接法制备油酸醇酰胺的研究

研究了直接法制备油酸醇酰胺的最佳反应条件     

由偏铝酸钠直接制取高纯γ-Al2O3

引　言γ Al2 O3是一种多孔、高分散度的固体物料 ,比表面积大、吸附性能好 ,γ Al2 O3膜能有效地分离醇 水、酮 水混合蒸气 ,热稳定性良好 .其活性特征的主要指标为孔容、比表面积 ,这两个参数高时活性亦高 .γ Al2 O3中的钠、硅、铁、钙等杂质离子会使催化剂中毒 ,降低催化     

由偏铝酸钠直接制取高纯γ-Al2O3

引言 γ-Al2O3是一种多孔、高分散度的固体物料,比表面积大、吸附性能好,γ-Al2O3膜能有效地分离醇-水、酮-水混合蒸气,热稳定性良好.其活性特征的主要指标为孔容、比表面积,这两个参数高时活性亦高.     

直接法制造锡酸钠的工艺研究

研究了含Ｓｎ４６％的锡精矿直接制造锡酸钠的工艺流程。试验结果表明,焙烧温度和煤与锡矿比是主要影响因素,其次是矿石粒度、煤粉粒度和焙烧时间。焙砂用ＮａＯＨ溶液浸出,锡浸出率达到９４％～９５％。浸出液进行浓缩结晶,制出了高质量的锡酸钠。     

丙醇电解氧化直接合成丙酸丙酯的研究

在酯化催化剂（Ｈ＿２ＳＯ＿４）作用下，丙醇在Ｐｂ－ＰｂＯ＿２阳极上电解直接合成丙酸丙酯。考察了电极、温度和通电量对产率的影响。