可追溯茶叶产品的认知、信任与购买意愿研究

基于646份消费者调查数据,通过结构方程模型,分析消费者对可追溯茶叶产品的认知情况、信任程度与其购买意愿间的关系.研究发现,对可追溯茶叶产品认知程度的增加会提升消费者对可追溯茶叶产品的信任程度,对可追溯茶叶产品信任程度的增加会显著提升消费者购买可追溯茶叶产品的意愿;认知程度对提升消费者对可追溯茶叶产品的购买意愿有正向影...     

CLDAS融合土壤湿度产品在东北地区的适用性评估及订正

通过计算CLDAS的0-20cm土壤相对湿度融合产品与农业气象观测站逐旬10cm土壤相对湿度观测值的相关性和偏差,综合分析CLDAS在东北地区的适用性。结果表明：CLDAS融合土壤相对湿度能较合理地反映东北地区10cm深度土壤相对湿度的空间分布,但是在对极值的描述上有所欠缺,其中CLDAS对辽宁西部和黑龙江西南部的土壤相对湿度模拟偏高较明显,而在黑龙江的东北部地区对实际土壤相对湿度的模拟偏低;总体上,CLDAS融合土壤相对湿度资料在东北地区的适用性由西南向东北方向递减,在吉林和辽宁省的适用性更好。回归订正和7旬滑动平均订正法对CLDAS产品的误差订正表明,订正结果大大提高了CLDAS产品的精度,其订正后产品可以应用于土壤湿度干旱监测业务。     

木薯不同部位光合同化产物分配的研究

摘要：本试验以南洋红、SC124、GR911、巴西种及GR891为试验材料,分析各木薯品种光合产物蔗糖和淀粉在不同部位的分配。试验结果表明：叶片同化产物蔗糖,直接通过韧皮部的运输到达块根,在块根中通过淀粉合成酶,转化成淀粉,随着块根淀粉含量的增大,叶片、块根中蔗糖含量也有增大的趋势,随着木薯块根淀粉积累的速度增加,叶片、叶柄中淀粉含量呈逐步减少的趋势。     

Effects of carbonization temperatures on microstructure of carbon fiber precursors prepared from liquefied wood

In order to enlarge the utilization field of wood and decrease the costs of carbon fibers, carbon fiber precursors from liquefied wood were prepared by soaking liquefied wood in a solution containing hydrochloric acid and formaldehyde, after melt-spinning by adding hexamethylenetetramine. The microstructure evolution of the precursor during carbonization was studied by FTIR, X-ray analysis and Raman spectroscopy. The results show that precursors from liquefied wood above 400°C had diffraction peaks corresponding to the (100) crystal plane. When the carbonization temperature reached 500°C, Raman spectroscopy showed the D peak at wave number of 1360 cm–1 and the G peak at 1595 cm–1. By increasing the carbonization temperature, the microstructure of the precursors became more ordered. Although the structure of the precursor changed at 500 and 800°C, the peaks at 1632 and 1454 cm–1 corresponding to the characteristic vibrations of aromatic rings, remained during carbonization. This implies that the precursor from liquefied wood cannot be easily formed into graphite.     

Green Wood Public Procurement Development in China

The green government(public) procurement system plays an important role in achieving the policy objective of energy saving and environmental protection,and promoting green technology progress in enterprises.The green government procurement starts comparatively late in China,and there are still a lot of problems in the legal system,procurement standards,organization and management system, information communication and monitoring evaluation mechanisms and so forth.With international experience as the refer...     

改进工艺提升民营橡胶产品质量

通过对西双版纳天然橡胶产品质量较低的原因分析,通过试验研究,提出改进工艺,规范生产,采用先进生产技术以提升橡胶产品质量的意见。     

液化木基热塑性酚醛树脂的固化反应动力学

利用差示扫描量热法(DSC)研究了液化木基热塑性树脂(PWF)的固化特征及其动力学,用热重法(TG)和傅立叶红外光谱技术(FT-IR)研究了固化后PWF的热降解性能和结构特征,并对比研究了传统热塑性酚醛树脂(PF)的固化反应,旨在为确定新型PWF的固化工艺提供依据.结果表明,六次甲基四胺(HMTA)用量对固化反应的表观活化能影响较大,HMTA与树脂质量比为100:10时,表观活化能较低,为107.76kJ/mol,低于相同条件下PF的表观活化能(141.35kJ/mol);HMTA用量对固化反应级数几乎没有影响,反应级数恒定在0.95,与PF的固化反应级数相同.最大固化速率温度和升温速率(Tp-β)外推法求得PWF固化工艺温度在135～137℃.PWF和PF的热重曲线变化趋势在30 ～ 291℃完全相同,两者在200℃以前几乎不发生失重现象,当温度超过200℃后,两者皆有轻微的失重,PWF和PF的热降解温度分别为291和296℃.IR结果证明固化后PWF和PF的结构相似.     

Alkaloids as potential anti-tubercular agents

An increasing incidence of deaths due to tuberculosis and the known drawbacks of the current existing drugs including the emergence of multi drug-resistant strains have led to a renewed interest in the discovery of new anti-tubercular agents with novel modes of actions. The recent researches focused on natural products have shown a useful way to obtain a potentially rich source of drug candidates, where alkaloids have been found more effective. The present review focuses on current epidemiology of tuberculosis, synergy of the disease with HIV, current therapy, available molecular targets and, highlights why natural products especially alkaloids are so important. The review summarizes alkaloids found active against mycobacteria from the mid-1980s to late 2008 with special attention on the study of structure–activity relationship (SAR).     

天然植物香料在肉制品中的抗氧化应用研究

天然植物香料的研究已成为目前国内外研究的热点问题。主要介绍了天然植物香料的抗氧化性及其在肉制品中的应用。     

香糯竹综合开发利用初步研究

香糯竹——唯一一种用于烧制竹筒饭的竹子,是植物系统分类学研究中具有重要学术价值并具有特殊文化内涵的珍稀竹种.在对香糯竹的综合开发价值进行初步分析和研究后,提出了以竹筒系列食品、竹浆造纸、竹工艺品、竹化妆品、竹保健品为主的开发方案.