Results 71 to 80 of about 3,218 (153)
Effect of Different Packaging Materials on the Quality of Toona sinensis Powder Analyzed by Gas Chromatography-Ion Mobility Spectrometry Combined with Multivariate Statistical Analysis [PDF]
To extend its shelf life, vacuum freeze-dried Toona sinensis (VFDTS) powder was packaged in sealed polyethylene (PE) bags, sealed aluminum foil bags, composite vacuum bags, or aluminum foil vacuum bags.
ZHAO Lili, WANG Jihong, LU Chenxi, SHI Guanying, ZHANG Le, JIANG Pengfei, WANG Zhaogai
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Dianci bileiqi, 2015 复合绝缘子的硅橡胶表面在防污闪方面具有优越的性能,但是污秽硅橡胶表面的闪络特性以及机理尚未达到共识。为了研究污秽硅橡胶表面局部电弧的特性,以硅橡胶三角平板模型为研究对象,对其在高压直流电场中的电弧特性进行了研究。研究发现:染污硅橡胶表面局部电弧的伏安特性呈现下降型的趋势,其电弧常数A值为65.7,更接近于空气电离下A=6080的情况;染污硅橡胶表面局部电弧产生机制与瓷、玻璃表面有本质上的差异,其在较大程度上可能是由空气电离产生;电弧长度不同时,电弧的场强分布及其E-I特性有差异 ...
王秀娟 +4 more
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Changes in Flavor Substances of Lightly-pickled Cucumbers during Storage Based on Electronic Nose Combined with GC-IMS [PDF]
In order to investigate changes in flavor substances of lightly-pickled cucumbers during storage, volatile compounds were analyzed by electronic nose and gas chromatography-ion mobility spectrometry (GC-IMS).
Dan WANG +6 more
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Shuitu Baochi Xuebao, 2011 通过室内土柱淋溶试验,对阿特拉津在2种供试土壤中淋溶规律及其影响因子进行了研究。结果表明,淋溶速度由1.8ml/min增至4.4ml/min,阿特拉津的土壤残留量降低,淋出量分别增加10.8%(黑土),8.2%(草甸黑土);同时,增加土壤有机质含量,适当降低淋溶液中H+离子浓度,均有利于抑制土壤中阿特拉津的迁移与流失。研究结论对农业生产的污染防治具有积极意义。
王玉军 +5 more
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Dianci bileiqi, 2022 为满足特高压直流工程需求，避雷器用ZnO电阻片配方及工艺均得到较大调整，表现出与前期不同的老化特性。研究发现，随着老化时间增长，功耗曲线逐渐降低后趋于稳定。通过对比老化前后的两个电气参数(参考电压和冲击残压)后发现，电阻片正方向参考电压增大，反方向降低，严重时变化率可超过5%;正反向残压均增大。根据双Schottky势垒模型分析老化机理认为，非稳态离子锌填隙和晶界氧离子在直流电场下的定向迁移导致势垒畸变，荷电率越高畸变越严重，使得宏观电气性能出现上述变化。依据现行标准此类电阻片能够通过加速老化试验 ...
赵霞 +5 more
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Effect of Different Commercial Saccharomyces cerevisiae Strains on the Organic Acids and Aromatic Substances of Actinidia arguta Wines [PDF]
This study examined the effect of different Saccharomyces cerevisiae on the flavor and taste of Actinidia arguta wine. Nine kinds of commercial S. cerevisiae were applied to ferment A. arguta wine.
Bowei SUN +7 more
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Analysis of Differences in Flavor Characteristics among Different Grades of Stir-Fried Pixian Broad Bean Paste by SPME-GC-MS and GC-IMS [PDF]
In order to identify the differences in flavor among different grades of stir-fried Pixian broad bean paste, solid-phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS), GC-ion mobility spectrometry (GC-IMS), principal component ...
ZHANG Hao, GU Siyuan, DENG Jing, ZHOU Jianqin, TANG Yingming, YI Yuwen
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Effect of Pretreatment Combined with Hot Air Drying on Flavour Substances in Saimaiti Cut Apricots Based on GC-IMS [PDF]
The effects of color-preserving pretreatments (hot water blanching, steam blanching, microwave treatment, and sulfite soak) and hot air drying temperatures (40, 50, 60 °C) on the flavor compounds of half-cut and destoned fresh Saimaiti apricot and dried ...
Chunping CHENG +4 more
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Gaoya dianqi特高压直流输电线路形成的离子流在风力作用下迁移，由于风具有地域性与随机性，造成离子流密度ρj与合成场强E的量化评估困难。目前计及风力的E值统计评估未考虑到风速与风向随机性的关联，且缺少对多风向下离子流迁移的模拟。为此，文中以湖州±800 kV线路为例，将传统二维线路合成场有限元模型拓展到三维，得到—影响下ρj与E的变化规律，并以Copula函数构建概率模型，提出一种安全评估技术。结果表明：风速决定了空间电荷扩散程度，风向决定其扩散轨迹；风速增大使ρj与E先增大后减小；风向与线路走向夹角减小使风力影响减弱；
秦子翌 +4 more
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Shuitu Baochi Xuebao, 2018 通过田间桶栽试验研究了高浓度镉（40 mg/kg）条件下，4种改良剂（有机—无机复合稳定剂、无机高分子复配材料、聚丙烯酸盐复配材料、有机高分子复配材料）对棉田土壤剖面中土壤pH、阳离子交换量（CEC）、镉含量及其形态分布迁移的影响。结果表明：（1）4种改良剂均显著提高了棉田土壤剖面各层的pH和CEC，无机高分子复配材料在0—20 cm土层效果最好，分别增加了0.43个单位和4.43 cmol/kg；（2）改良剂促进土壤可交换态镉向其余4种形态的转化，相关分析表明碳酸盐结合态与可交换态镉含量呈极显著负相关（
安梦洁 +5 more
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