Dough rheological properties and noodle-making performance of non-waxy and waxy whole-wheat flour blends

Dough rheological properties and noodle-making performance of non-waxy whole-wheat flour (WWF) with partial- or full-waxy (PW- or FW-) WWF substitution were studied. The substitution levels were 0, 250, 500, 750, and 1000 g/kg, respectively. FW-WWF reduced the peak viscosity and pasting temperature of WWF blends as its substitution level was increased due to its higher proportions of B-type starch granules and short amylopectin chains, while PW-WWF increased peak viscosity with the increasing substitution level because of its higher amylopectin content. As demonstrated by farinograph and rheometer measurements, FW-WWF interfered with gluten development because of the increased competition for water by arabinoxylans and amylopectin; however, PW-WWF enhanced dough strength due primarily to its increased protein content. Consequently, FW-WWF showed a detrimental effect on cooked noodle texture as the cooked noodle hardness was reduced by 50% at the 1000 g/kg substitution level. In contrast, PW-WWF enhanced noodle integrity and elasticity by increasing cooked noodle cohesiveness and resilience by 10.1% and 14.8%, respectively, at the 1000 g/kg substitution level. The results suggest that with waxy WWF substitution, the changes in starch composition, arabinoxylans, and protein content could modify the interactions among flour components and influence the quality characteristics of noodle products.     

移动信息服务在农村地区初始采纳的实证研究

建设社会主义新农村是我国政府的重要任务,而新农村建设的关键任务之一是推进具有信息化特征的现代农业。在农村地区信息化背景下,研究驱动农村用户采纳移动信息服务的主要因素。根据使用移动信息服务的内部动机和外部动机,主要研究娱乐、信息、社会互动、长期在线和方便性等5个因素并建立了模型。根据实证数据验证了模型,最后得到了一些重要结论,反映了农村地区在移动信息服务采纳中的现状,可为电信部门推广农村业务提供帮助。     

农村用户网络信息服务技术采纳模型及实证研究

农村地区推广普及网络信息服务技术,关键是明确影响农户采纳网络信息服务的因素。运用实证研究手段,以技术接受模型为基础,加入主观规范和自我效能潜在变量,建立农户对林业网络信息服务技术采纳模型。在检验量表信度和效度的基础上,采用结构方程方法,验证了模型及相关假设,证明了技术接受模型在农户网络信息服务采纳环境中的有效性以及主观规范和自我效能对农户采纳的影响性。     

基于TAM理论的农业网站评价指标体系研究

本文在TAM技术接受模型的基础上,构建农业网站的使用模型,提出农业网站建设要遵循"功能易用"和"信息有用"的原则,从"网站功能设计、信息内容、数据监测"3个方面对农业网站进行评价,并建立一套评价指标体系以规范农业网站建设。     

新型化学诱导剂TAM在水稻育种上的应用

为了探索新的育种方法，进一步水稻产量的潜力，笔者应用自己发明的ＴＡＭ诱导剂成功地诱导了水稻孤雌生殖植株，通过对其诱导后代按系谱法进行选育，获得了一批高产，优质，抗性好的水稻新品系。试验结果表明，不同的ＴＡＭ施用浓度，施药时间与不同水稻品种，其诱导效果各异，以１００ｍｇ／Ｌ浓度处理１ｍｉｎ为宜。     

TAM诱导水稻无融合生殖的胚胎学研究

为探明TAM诱导剂诱导水稻无融合生殖所形成的籽实的胚和胚乳起源，对其进行了胚胎学研究，结果表明，胚可能起源于卵细胞和一个助细胞融合所形成的细胞，两极核融合成次生核，由次生核分裂形成胚乳核，最终形成正常胚乳。     

ERP实施过程中的技术采纳模型及实证研究

研究了领导支持、培训、相容性和主观规范对ERP采用过程、使用者可用认知和易用认知的影响。结果表明,领导支持、ERP培训和相容性是影响员工对ERP系统的有用认知和易用认知的重要因素,同时证实了认知因素对行为意向的影响。     

Estimation of dwarf green bean water use under semi-arid climate conditions through ground-based remote sensing techniques

Determination of temporal and spatial distribution of water use (WU) within agricultural land is critical for irrigation management and could be achieved by remotely sensed data. The aim of this study was to estimate WU of dwarf green beans under excessive and limited irrigation water application conditions through indicators based on remotely sensed data. For this purpose, field experiments were conducted comprising of six different irrigation water levels. Soil water content, climatic parameters, canopy temperature and spectral reflectance were all monitored. Reference evapotranspiration (ET₀), crop coefficient K_c and potential crop evapotraspiration (ET_c) were calculated by means of methods described in FAO-56. In addition, WU values were determined by using soil water balance residual and various indexes were calculated. Water use fraction (WUF), which represents both excessive and limited irrigation applications, was defined through WU, ET₀ and K_c. Based on the relationships between WUF and remotely sensed indexes, WU of each irrigation treatments were then estimated. According to comparisons between estimated and measured WU, in general crop water stress index (CWSI) can be offered for monitoring of irrigated land. At the same time, under water stress, correlation between measured WU and estimated WU based on CWSI was the highest too. However, canopy-air temperature difference (T_c − T_a) is more reliable than others for excessive water use conditions. Where there is no data related to canopy temperature, some of spectral vegetation indexes could be preferable in the estimation of WU.     

基于TAM的民族地区高校大学生使用数字化信息资源行为影响因素实证研究

[目的/意义]高校图书馆数字资源对学生的学习、科研研究有着很重要的作用。从用户的角度展开研究,能深入了解用户使用数字资源行为意愿,精准建设数字资源。[方法/过程]基于技术接受模型,对国内外相关研究进行定性研究并在此基础上构建了民族地区高校学生用户使用数字资源行为意愿模型并对此进行了结构方程路径分析并对不同民族大学进行了特定群体分析。[结果/结论]结果发现数字信息系统的有用性和易用性等对学生使用行为有显著的影响。特定群体分析结果发现系统特征、个体差异和信息内容质量等因素对民族地区高校汉族大学生使用数字资源有正向影响,而影响蒙古族大学生使用信息系统的因素主要有系统特征、自我效能感和易用性等。     

新时期北京农户绿色农业生产意愿及其提升路径研究——基于TAM和SEM的农户感知与政策因素影响分析

为推动北京地区绿色农业高效发展,了解广大农户的绿色农业生产意愿并寻求可靠提升路径意义重大。本研究借鉴技术接受模型的分析框架,将意愿的影响因素设计为农户感知和政策因素两大类,利用北京市10个区350个农户的调查数据,采用结构方程模型系统分析了农户感知与政策因素对农户绿色农业生产意愿的影响效果及其相互关系。感知有用性和政策响应对农户参与绿色农业生产意愿具有显著正向影响;感知易用性通过感知有用性的中介作用对意愿产生影响;政策执行力通过感知易用性、感知有用性和政策响应的中介作用对意愿产生影响。并对各因素的综合影响力进行了比较。基于以上分析,提出提升北京农户绿色农业生产意愿的路径建议：采取有效措施提升农户对发展绿色农业有用性和易用性的认知;科学合理设计有效政策,力求提升政策响应效果;强化政策执行落实,发挥政策应有效力。