该文以品质特性相差较大的34个小麦品种(系)为材料,采用偏最小二乘回归(partial least squares regression,PLSR)分析研究小麦粉的品质特性与生鲜面色泽、质构、感官特性的关系。结果表明,所试小麦粉的品质指标具有较大的变异系数(小麦...该文以品质特性相差较大的34个小麦品种(系)为材料,采用偏最小二乘回归(partial least squares regression,PLSR)分析研究小麦粉的品质特性与生鲜面色泽、质构、感官特性的关系。结果表明,所试小麦粉的品质指标具有较大的变异系数(小麦粉b*值的变异系数为215.84%),样品具有较好的代表性;小麦粉L*值对生鲜面L*值具有显著性贡献(p<0.05),生鲜面L*值与蛋白质、湿面筋、干面筋含量、吸水率呈显著负相关(p<0.05);小麦粉的形成时间、稳定时间、粉质质量指数显著影响生鲜面的硬度指标(p<0.05);小麦粉的峰值黏度、最低黏度、最终黏度等与生鲜面的感官总分呈显著正相关(p<0.05),弱化度对其具有显著负影响(p<0.05)。结果表明,小麦粉的品质特性显著影响生鲜面的色泽、质构和感官特性,在生鲜面专用小麦品种优选中,需要综合统筹小麦粉色泽、糊化特性,以及面团筋力等因素的影响。展开更多
A novel two-wafer concept for micro-electro-mechanically tunable vertical cavity surface emitting lasers(VCSELs)is presented.The VCSEL is composed by two wafers:one micro-electromechanical-system membrane wafer with f...A novel two-wafer concept for micro-electro-mechanically tunable vertical cavity surface emitting lasers(VCSELs)is presented.The VCSEL is composed by two wafers:one micro-electromechanical-system membrane wafer with four arms to adjust the cavity length through electrostatic actuation and a"half-VCSEL"wafer consisting of a fixed bottom mirror and an amplifying active region.The measurement results of the electricity pumped tunable VCSEL with more than 9mW output power at room temperature over the tuning range prove the feasibility of the proposition.展开更多
A hundred and twenty-one households in Yujiang county, Jiangxi province were investigated by adopting questionnaire method, and the evaluation system of index was established according to the integrative, hierarchical...A hundred and twenty-one households in Yujiang county, Jiangxi province were investigated by adopting questionnaire method, and the evaluation system of index was established according to the integrative, hierarchical, scientific, practical, comparative and dynamic principles. The investigation data were firstly standardized and then processed with SPSS software. The index weight was confirmed by principal component analysis. Finally, the evaluation scale of ecoagriculture was calculated. The results showed that the evaluation value ranged from 0.141 to 0.689 for 121 households. Agricultural status of 113 households got the primary phase of ecoagriculture which accounting for 93.38%; 7 households into the second phase, representing 5.79% and only 1 household into the third phase according to the evaluation value. However, the ecoagriculture was divided into 5 stages, according to the evaluation value. Therefore, the ecoagriculture has huge potential to develop in red soil area, China.展开更多
为了解信阳茶区茶园土壤养分丰缺现状,为化肥减施提供理论依据,本研究监测了不同植茶年限(0、10、20、30、40年)0~20 cm土壤的养分及土壤交换性离子,分析其随植茶年限的变化特性。结果表明:茶园土壤有机质、碱解氮、有效钾与植茶年限呈...为了解信阳茶区茶园土壤养分丰缺现状,为化肥减施提供理论依据,本研究监测了不同植茶年限(0、10、20、30、40年)0~20 cm土壤的养分及土壤交换性离子,分析其随植茶年限的变化特性。结果表明:茶园土壤有机质、碱解氮、有效钾与植茶年限呈显著正相关,有效磷与植茶年限呈显著负相关;茶园土壤有机质含量达36.15 g kg^-1,达理想状态;碱解氮、有效钾、有效磷含量都表现为富集;土壤有机质与碱解氮和有效钾呈显著正相关,与有效磷呈显著负相关;茶园氮肥以铵态氮(NH4^+-N)为主,氮肥形态可影响土壤pH及交换性Al^3+、Ca^2+、Mg^2+的变化,有机质直接影响交换性K^+的变化。信阳茶区茶园土壤养分达到并超过优质高产高效茶园土壤养分需求,其氮磷钾肥明显呈现施入过量后的积累现象。该研究结果可以为茶园土壤可持续利用及茶园减施化肥提供依据。展开更多
文摘该文以品质特性相差较大的34个小麦品种(系)为材料,采用偏最小二乘回归(partial least squares regression,PLSR)分析研究小麦粉的品质特性与生鲜面色泽、质构、感官特性的关系。结果表明,所试小麦粉的品质指标具有较大的变异系数(小麦粉b*值的变异系数为215.84%),样品具有较好的代表性;小麦粉L*值对生鲜面L*值具有显著性贡献(p<0.05),生鲜面L*值与蛋白质、湿面筋、干面筋含量、吸水率呈显著负相关(p<0.05);小麦粉的形成时间、稳定时间、粉质质量指数显著影响生鲜面的硬度指标(p<0.05);小麦粉的峰值黏度、最低黏度、最终黏度等与生鲜面的感官总分呈显著正相关(p<0.05),弱化度对其具有显著负影响(p<0.05)。结果表明,小麦粉的品质特性显著影响生鲜面的色泽、质构和感官特性,在生鲜面专用小麦品种优选中,需要综合统筹小麦粉色泽、糊化特性,以及面团筋力等因素的影响。
基金Supported by the National Basic Research Program of China under Grant No 2006CB604902the National Natural Science Foundation of China under Grant No 60908012+2 种基金the Program for New Century Excellent Talents in University of Ministry of Education of China under Grant No 39002013200801the National Natural Science Foundation of China under Grant No 61076048the Board of Education Research Project under Grant No KM2010005030.
文摘A novel two-wafer concept for micro-electro-mechanically tunable vertical cavity surface emitting lasers(VCSELs)is presented.The VCSEL is composed by two wafers:one micro-electromechanical-system membrane wafer with four arms to adjust the cavity length through electrostatic actuation and a"half-VCSEL"wafer consisting of a fixed bottom mirror and an amplifying active region.The measurement results of the electricity pumped tunable VCSEL with more than 9mW output power at room temperature over the tuning range prove the feasibility of the proposition.
文摘A hundred and twenty-one households in Yujiang county, Jiangxi province were investigated by adopting questionnaire method, and the evaluation system of index was established according to the integrative, hierarchical, scientific, practical, comparative and dynamic principles. The investigation data were firstly standardized and then processed with SPSS software. The index weight was confirmed by principal component analysis. Finally, the evaluation scale of ecoagriculture was calculated. The results showed that the evaluation value ranged from 0.141 to 0.689 for 121 households. Agricultural status of 113 households got the primary phase of ecoagriculture which accounting for 93.38%; 7 households into the second phase, representing 5.79% and only 1 household into the third phase according to the evaluation value. However, the ecoagriculture was divided into 5 stages, according to the evaluation value. Therefore, the ecoagriculture has huge potential to develop in red soil area, China.
文摘为了解信阳茶区茶园土壤养分丰缺现状,为化肥减施提供理论依据,本研究监测了不同植茶年限(0、10、20、30、40年)0~20 cm土壤的养分及土壤交换性离子,分析其随植茶年限的变化特性。结果表明:茶园土壤有机质、碱解氮、有效钾与植茶年限呈显著正相关,有效磷与植茶年限呈显著负相关;茶园土壤有机质含量达36.15 g kg^-1,达理想状态;碱解氮、有效钾、有效磷含量都表现为富集;土壤有机质与碱解氮和有效钾呈显著正相关,与有效磷呈显著负相关;茶园氮肥以铵态氮(NH4^+-N)为主,氮肥形态可影响土壤pH及交换性Al^3+、Ca^2+、Mg^2+的变化,有机质直接影响交换性K^+的变化。信阳茶区茶园土壤养分达到并超过优质高产高效茶园土壤养分需求,其氮磷钾肥明显呈现施入过量后的积累现象。该研究结果可以为茶园土壤可持续利用及茶园减施化肥提供依据。
