稻谷储存过程中品质变化研究

通过对3个籼稻和3个粳稻在两种不同温度条件下储存的品质变化研究,探索稻谷储存品质产生的内在原因.结果表明:不同类型的稻谷在储存过程中的品质变化不同,与籼稻相比,粳稻部分指标对高温更加敏感;高温储藏比低温储藏导致稻谷品质劣变的速率大;稻谷糊化特性发生明显的变化,主要表现为峰值黏度,最低黏度,最终黏度和回生值都增大,而衰减值下降;利用物性仪对大米蒸煮后的质构特性测定表明,蒸煮米饭黏度减小、硬度增大、黏/硬减小;蒸煮品尝值与最低黏度、最终黏度极显著负相关,初步认为其可以作为初始判定稻谷陈化指标,但是对稻谷劣变程度的量化还需要进一步深入研究;利用SEM研究稻谷籽粒断面结构,显示:新鲜稻谷的胚乳细胞呈现非裸露状态,比较平滑,复粒淀粉被较厚的造体膜掩盖着,高温储藏下,稻谷横断面越来越粗糙,配入细胞内的淀粉粒裸露清晰可见,复粒淀粉的淀粉粒表面膜翘起并爆开.     

乳酸菌的培养方法及在葡萄酒中的应用

采用109#培养基,使用不同方式对乳酸菌进行培养研究。结果表明:平板培养条件要求高,在目前条件下,几乎培养不出;斜面培养比较容易,但只能定性;液体培养能估测出最大活菌数;以上培养方式在葡萄酒中的乳酸菌检测方面都处于摸索阶段。     

FZ/T 73023-2006《抗菌针织品》行业标准的编制过程、背景及相关参数的确定

简述了FZ／T 73023-2006《抗菌针织品》行业标准的编制过程及编制背景；结合该标准相关参数的确定过程，简要介绍了国内外纺织品抗菌性能测试方法的现状，以及抗菌纺织品的安全性要求；围绕维护人体皮肤微生态平衡的要求，简要阐明了该标准的先进性及创新性。     

注塑成型工艺对PBT收缩率的影响

论述了注塑成型中压力、温度、时间、速度等工艺条件对聚对苯二甲酸丁二醇酯注塑制品收缩率的影响,并以此为依据拟定了最佳成型工艺条件。     

Autefa打包机预压缸泄漏原因及改进

分析了聚酯短纤维装置德国Autefa公司打包机预压缸的漏油原因,提出了改进措施。通过对缸体上端部改为分体法兰连接,采用德国Hunger原装密封件改进缸体与活塞的密封,有效地防止了预压缸漏油。     

碳化作用对混凝土强度及氯离子渗透性能的影响

试验研究了CO2对粉煤灰混凝土28d抗压强度和氯离子渗透性能的影响。结果表明：碳化作用提高了粉煤灰混凝土28d抗压强度,但随着粉煤灰掺量的增加,混凝土28d抗压强度逐渐减小;在标准养护条件下,粉煤灰对混凝土抗氯离子渗透性有改善作用,而碳化作用使混凝土抗氯离子渗透性能明显降低,且此时粉煤灰的掺人更加增强了对混凝土抗氯离子渗透性能的不利影响。     

Co-production of hydrogen and multi-wall carbon nanotubes from ethanol decomposition over Fe/Al2O3 catalysts

The co-production of hydrogen and carbon nanotubes (CNTs) from the decomposition of ethanol over Fe/Al₂O₃ at different temperatures and feeding rates of ethanol was investigated systematically. The results indicated that Fe/Al₂O₃ was a quite active catalyst for the co-production of hydrogen and CNTs and that its activity and stability depended strongly on the Fe loading. Among all catalysts tested, 10 mol% Fe/Al₂O₃ was the most effective catalyst based on the ratio of hydrogen production, the total H₂ yield, and the quality of the CNTs formed. The efficiency of hydrogen production from ethanol decomposition over 10 mol% Fe/Al₂O₃ reached a maximum of 80% at 800 °C and the yield of CNTs with well-oriented growth and uniform diameter was 141%. In addition, the reaction of hydrogen and CNTs co-produced from ethanol decomposition was proposed.     

天然胶乳/炭黑复合材料的动态力学性能研究

通过添加阴离子表面活性剂,制备了稳定性能优异的炭黑分散液;然后将其添加到天然胶乳(NRL)中,采用胶乳共沉法制备NRL/炭黑复合材料,并对其物理性能、动态力学性能和内生热等进行了探讨。研究结果表明:当炭黑类型相同时,由胶乳共沉法制备的硫化胶之力学性能普遍优于由机械法制备的硫化胶;当采用炭黑N375补强时,由胶乳共沉法制备的硫化胶之力学性能相对最佳,其拉伸强度、撕裂强度和硬度分别比由机械法制备的硫化胶提高了6.5%、4.6%和8.8%;由胶乳共沉法制备的硫化胶之损耗因子(tanδ)小于由机械法制备的硫化胶,故前者的滞后损失更小、内生热更少且温升更低。     

城市供水水质生物稳定性与管网微生物生长相关性研究进展

综述了由于水源污染和常规净水工艺局限性对城市供水系统水质生物稳定性的影响,及当前国内外对饮用水水质生物稳定性和供水管网中微生物再生形成生物膜的研究现状,并对研究管网生物膜微生物种群结构的最新分子生物学方法进行了阐述.     

Nonisothermal modeling of heat transfer inside an internal batch mixer

A nonisothermal transient process of temperature increase due to viscous heating was simulated for a 69 cm³ internal batch mixer (BM) using a computational fluid dynamics (CFD) software, Polyflow 3.9 form ANSYS, Inc., to obtain the temporal temperature distribution and characterize the heat transfer between polymer melt and mixer wall. The melt temperature obtained from simulation was verified with experiments. Starting from a uniform temperature of 463 K, when a rotation speed of 5.24 rad/s is imposed, viscous heating caused a maximum temperature rise of 3 K for a polyethylene (PE) resin, and 6 K for a polystyrene (PS) resin. The transient flow fields inside the batch mixer were characterized with velocity profiles and a mixing index parameter, which show that laminar flow dominates inside the mixer while a small percentage of elongational flow, converging flow, and recirculation flow is also present. © 2010 American Institute of Chemical Engineers AIChE J, 2011