母乳脂化学组成的研究进展

摘要：母乳是一种极为精细和复杂的营养体系,是婴幼儿的最佳食物。母乳中的脂肪成分是婴幼儿的最佳脂肪来源,因其具有供能高效、易被婴幼儿消化吸收、能抵抗病原微生物等特点,对婴幼儿有着不可或缺的作用。对母乳基本化学组成进行了介绍,重点综述了母乳脂中甘油三酯和磷脂的组成、含量及脂肪酸分布特点,并简要概述了胆固醇的含量及检测方法,为进一步明确母乳脂生理功能以及开发与母乳脂高度相似的婴幼儿配方奶粉用油提供科学参考。     

WPU涂层改性薄型牛革的拉伸性能研究

皮革的薄型化是一种发展趋势，薄型化皮革的伸长率与抗张强度是服饰用皮革的重要性能。本文主要研究WPU涂层改性对不同厚度牛革的伸长率和抗张强度的影响。选取同一张牛革，分别从横纵向上切割成不同厚度，并使用不同质量分数的SiO₂对WPU进行改性，进一步对WPU涂层改性后的不同厚度牛革进行拉伸对比。结果发现：随着SiO₂质量分数增加，牛革伸长率增加，纵向伸长率始终大于横向伸长率；横纵向之间抗张强度差异较大，随着SiO₂质量分数增加，牛革抗张强度先增大后减小；SiO₂改性的WPU涂层牛革，在一定程度上提高了牛革的抗张强度，牛革的伸长率与抗张强度之间呈负相关，无明显线性关系。     

Study of the spectrum effect on the threshold of resonant magnetic perturbation penetration on J-TEXT

The spectrum effect on the penetration of resonant magnetic perturbation (RMP) is studied with upgraded in-vessel RMP coils on J-TEXT. The poloidal spectrum of the RMP field, especially the amplitudes of 2/1 and 3/1 components, can be varied by the phase difference between the upper and lower coil rows, Δϕ=ϕ_top−ϕ_bottom, where ϕ_top and ϕ_bottom are the toroidal phases of the n = 1 field of each coil row. The type of RMP penetration is found to be related to Δϕ, including the RMP penetration of either 2/1 or 3/1 RMP and the successive penetrations of 3/1 RMP followed by the 2/1 RMP. For cases with penetration of only one RMP component, the penetration thresholds measured by the corresponding resonant component are close for various Δ_f. However, the 2/1 RMP penetration threshold is significantly reduced if the 3/1 locked island is formed in advance. The changes in the rotation profile due to 3/1 locked island formation could partially contribute to the reduction of the 2/1 thresholds.     

盐水体系的二氧化碳-氢水合物结构和组分研究

水合物法二氧化碳(CO₂)捕集是实现“双碳”目标的高效技术之一。利用激光拉曼测量气体水合物结构和组成可以作为定性/定量分析水合物法CO₂分离捕集效率的基础。本研究利用激光拉曼测量了不同体系利用水合物法从CO₂/H₂混合气中分离捕集CO₂过程中水合物的微观结构和组成。研究结果表明，利用泡沫镍代替机械搅拌，促使H₂进入了水合物笼，从而降低了CO₂的分离效率。研究结果为进一步优化水合物法CO₂分离捕集工艺提供了科学依据。