星风物质损失率对大中质量转动恒星演化的影响

文章采用四个不同星风物质损失率公式,计算了5M⊙和15M⊙转动恒星的演化。通过对演化结果的比较发现:星风物质损失率的大小对大质量转动恒星演化的影响比对中质量恒星的影响要大;星风作用越大,恒星在HR图中的演化轨迹向低光度方向移动;而且较大的物质损失率降低了恒星内部CNO循环的反应速率,从而延长了恒星的演化寿命,并影响到恒星内部的密度和温度等各个物理量。

三轴椭球体模型中星风物质损失率的分布

采用三轴椭球体模型和理论计算,数值模拟并分析了子星的星风物质损失率分布。结果表明三轴椭球体模型下受有效重力加速度和不透明度的影响,子星的星风物质损失率分布是非均匀的,在该分布和子星形变的共同影响下角动量损失率的分布也是非均匀的。

彩钢板组合仓与编织袋仓储存籼稻损失对比研究

文章对三节式彩钢板组合仓和编织袋仓储存籼稻1年的重量损失和品质变化的影响进行了研究。结果表明,彩钢板组合仓的储粮平均损失率为1.33%,编织袋仓储粮平均损失率为6.42%;彩钢板组合仓相较于编织袋仓,就所储存籼稻的霉变率、虫蚀率、脂肪酸值、不完善粒、出糙率等品质指标而言,是一种更好的农户储粮装具。

甲酸对全株玉米青贮饲料营养价值的影响

全株玉米秸青贮时分别加入0%、0.05%、0.1%的甲酸,添紧压实,密封保存于罐内一定时间,然后测定玉米青贮原料、青贮饲料DM损失率,用瘤胃尼龙袋法测定青贮饲料有效降解率,分析相关营养指标。试验结果表明:甲酸有提高青贮料中NDF、ADF及Ash含量的趋势,且随着甲酸量的提高而提高。玉米秸经青贮后,无论有无甲酸,都可显著提高CP含量,CP含量提高22.53%-28.68%;降低NDF、ADF含量,分别比青贮原料降低9.22%-16.37%、15.84-23.66%;灰分含量比青贮原料提高7.98%-22.5%。甲酸有提高青贮玉米秸DM、OM、NDF有效降解率的作用趋势,其中0.1%甲酸组与QⅢ对照组相比差异极显著(P〈0.01)。但添加甲酸会提高青贮饲料DM损失率。0.05%甲酸组、0.10%甲酸组与对照组相比,DM损失率分别增加38.7%、120.14%,差异显著,表明玉米秸青贮时添加甲酸不利于营养物质的保持。玉米秸经青贮(QⅠ、QⅡ、QⅢ)后,不管有无甲酸,DM、OM、NDF有效降解率与青贮前玉米秸对比差异极显著(P〈0.01),玉米秸经青贮后可提高DM有效降解率17.79%～24.30%;OM有效降解率13.62%～20.51%;NDF有效降解率10.43%～23.70%。

Antisepsis and Fresh-keeping Effects of Natamycin Coating Compounds Treatment on Red Global Grape

The aim was to research fresh-keeping effects of natamycin on cold-pre- served grape. Red globe grapes were processed with compound coating liquid of chitosan with mass fraction at 1% and natamycin with mass fractions at 0.20% （T1）, 0.40% （T2） and 0.60% （T3）, respectively. Grapes processed with water （CK3） and 1% chitosan （CK2） were taken as control groups. Rotten rate, seed shattering rate, mass loss rate, respiratory intensity and related physiological quality in test and control groups were compared. The results indicated that respiratory intensity, mass loss rate, rotten rate and seed shattering rate in CK1 were all higher than those in CK2. In addition, T1, T2 and T3 were lower in the indices than CK1 and CK2, but still kept at a high level in fruit hardness. Furthermore, mass fractions of Vc and titratable acid declined more slowly in T1, T2 and T3, compared with CK1 and CK2. Natamycin better preserved grapes and prolonged storage period. In general, natamycin with mass fraction at 0.4% proved best in fresh-keeping.

An Improved Heat Transfer Model for Flame Resistant Fabric Used in Thermal Protective Clothing

An improved numerical heat transfer model considering pyrolysis effect is proposed to predict thermal performance of heat-resistant fabric subjected to radiant heat flux. The model incorporates the heat-induced changes in fabric thermophysical properties. The new model has been validated with data from modified Radiant Protective Performance (RPP) tests of flame-resistant cotton fabrics. Comparison with experimental data shows that the predictions of mass loss rates and temperature profiles within the charring material and skin simulant are in reasonably good agreement with the experiments. Results from the numerical model contribute to a better understanding of the heat transfer process within flame-resistant fabrics under high heat flux conditions, and also to establish a systematic method for analyzing heat transfer in other fibrous materials applications.

菜子饼巧脱毒

菜子饼含有芥子苷等多种抗营养因子,是限制其利用的基本因素。现介绍几种农村适用的简易方法,能使菜子饼脱毒率达25%以上。一、硫酸亚铁处理法将菜子饼粉碎,按饼重的1%称取硫酸亚铁,溶于饼重1/2量的水中。待硫酸亚铁溶解后,将饼拌湿,以100℃温度蒸30分钟,取出,晾干即可饲用。此法脱毒率达76.83%,粗蛋白质损失率0.46%。