脂质体化妆品

本文介绍了脂质体的结构,性能和合成方法,并简要介绍了脂质体包埋皮肤活性成分维生素A和维生素E醋酸盐的合成过程。重点讨论了包埋皮肤活性成分的脂质体在化妆品中的作用,并指出了脂质体化妆品的发展趋势。     

防衰老抗皱化妆品的功效评价与展望

介绍了皱纹的形成原理、影响因素、相关的预防措施和防衰老抗皱产品的主要活性成分等;重点介绍了国内外对防衰老抗皱化妆品功效评价的进展情况,包括抗皱活性成分评价、皮肤黏弹性测定、纹理和皱纹直接观察评价方法,以及一些其他的抗皱功效评价方法等等;同时展望了抗皱化妆品的未来发展趋势,为我国抗皱化妆品事业的发展提供参考。     

化妆品常见保湿剂应用现状分析及研究趋势展望

皮肤水分含量较低时会引起皮肤干燥、皮肤炎症、弹性下降及皮肤屏障受损等问题。化妆品用保湿剂市场规模巨大,且随着消费者对功效活性成分和科学护肤的认识提高,皮肤保湿成分的研究受到消费者和企业的关注。文章简单介绍了皮肤结构和保湿机理,保湿剂的市场情况及常见热门化妆品用保湿原料,探讨了化妆品保湿剂开发及相关领域创新研究的新思路。     

化妆品面部刺痛测试

评估新推出的化妆品或新成分需要对敏感人群进行特殊的皮肤测试,因这些人更易出现皮肤刺痛感,尤以面部刺痛为最常见的反应。由于这种异常的皮肤不适感一般不伴有明显的临床体征,不易引起人们的重视。介绍了面部刺痛试验,它可对引起皮肤敏感的化妆品或化学物作出较好的评估和分类。     

敏感肌形成机制及抗敏感成分研究进展

本文从敏感肌的特点及影响因素、形成机制以及敏感肌功效成分等方面对目前敏感肌研究进展进行了概述。敏感肌的成因复杂多样,根据目前研究可总结为皮肤屏障功能受损、表皮存在炎症状态、皮肤感受神经系统异常3个机制,但往往敏感肌的形成是多个机制相互累及的。此外,敏感肌肤人群皮肤或表现为皮肤微生物群异常,可能会加重皮肤敏感程度。同时,从敏感肌形成的角度归纳和总结了对改善敏感肌有效的成分,提出了敏感肌护理以及化妆品开发的相关意见。最后,指出了敏感肌的形成机制与新功效成分,尤其是敏感皮肤的形成与皮肤菌群的关系仍有待深入研究和证实。     

天然绿色趋势渐强,特色植物资源美白成分将备受青睐

近年来,越来越多的消费者使用美白化妆品以达到美白皮肤的目的。因此,各种各样的化妆品美白成分成为化妆品行业关注的焦点,并被广泛应用。通过对化妆品美白活性成分及特色植物资源美白成分进行综述,为化妆品美白成分,尤其是为特色植物资源美白成分的研究、开发及应用提供一定的参考。     

灵芝在化妆品中的应用

阐述了灵芝的主要活性成分及其在皮肤抗衰老、美白、抗炎、抗过敏和防辐射方面的功效作用,介绍了灵芝在化妆品中的应用现状,展望了灵芝在化妆品中的应用前景。     

化妆品抗衰老活性物质作用机制及应用技术研究进展

基于消费者对于抗衰老化妆品日益增长的需求,论述了现阶段化妆品行业中活性物质抗皮肤衰老作用机制的研究进展;并依据大部分活性物质稳定性及生物相容性较差等现状,阐述了目前化妆品行业增强活性物质稳定性和皮肤渗透性的各种技术手段,展望了抗衰老化妆品的研究方向,为更好地开发抗衰老化妆品,保持皮肤年轻健康提供了参考。     

化妆品中美白活性成分检测方法研究进展

介绍了化妆品中多种美白活性成分作用机制及其安全性,概括了目前化妆品中常用的具有美白作用的物质及其祛斑原理,并综述了这些美白活性成分的检测手段,展望了化妆品中美白活性成分检测评价方法的未来发展趋势,为化妆品中多种美白活性成分检测方法的发展提供参考。     

甘草在化妆品中的应用

分别阐述了甘草的活性成分甘草总黄酮、甘草酸和甘草多糖应用于化妆品中的药理作用．其中甘草总黄嗣能有效地抑制酪氨酸活性,具有美白和抗炎作用,并具有一定的抗氧化作用;甘草酸和甘草多糖具有一定的抗衰老作用。介绍了甘草在化妆品中的应用现状和前景。指出了甘草活性成分应用在化妆品中的发展方向。     

汽车用灯头的注射模设计

针对汽车用塑料灯头的结构特点与工作环境,分析了灯头结构的复杂性、材料性能,注身工艺条件、合理地设计了注射成型模具,采用了组合式下模型芯来完成内孔的复杂成型,同时采用组合式侧抽芯来完成外侧面的卡钩与上面的穿线孔的成型,简化了模具的结构。     

新型气化型煤粘结剂

介绍一种新型气化煤粘结剂的制备方法和粘结作用机理，该粘结剂属有机粘结剂，粘结能力强，煤种适用范围广。制取的气化型煤机械强度高，灰份低，固定碳含量高。     

Strategy for development of fertilizer solutions for greenhouse tomatoes

A study of fertilization practices in intensively grown tomatoes, leading to a projection of developments in fertilizer usage is presented. Targets of optimal fertilization strategy were defined as follows: maximize fruit yield; maximize fruit quality; minimize environmental pollution with fertilizers; minimize corrosion of the fertilizer distribution system; minimize expenses on fertilizers. Information was gathered by literature searches and by personal interviews and visits to research institutes and growers.Rechecking of some fertilization practices for greenhouse tomatoes grown in detached media is proposed. The review indicates that the following should be rechecked: ammonium/nitrate ratio in fertilizer formulations; use of urea in fertilizer solutions; levels of phosphates applied; levels of sulphate applied; simple iron salts vs. chelated iron application; osmotic potential (OP), expressed as electrical conductivity (EC), of the nutrient solution at various growth stages.EC, pH and estimated prices of fertilizer solutions were calculated and presented in tables.     

Guidance for Mutual Disposition of Chromophores for Singlet Fission

The choice of chromophores and of their mutual geometrical arrangement for optimized singlet fission (SF) rates are considered. The electronic matrix element that enters the Fermi golden rule for the rate of SF is worked out algebraically for a simple model, but the density of states factor is not analyzed here. The model treats only the highest occupied and lowest unoccupied orbitals of the partners. It provides an approximate formula that requires only the knowledge of the expansion coefficients of these orbitals and of overlap integrals between atomic orbitals on the partners to obtain an estimate of the electronic matrix element. An illustrative application to a pair of ethylene molecules suggests that favored geometries will be those in which one of the AOs on the first ethylene overlaps with both AOs on the second ethylene, while the other AO on the first ethylene overlaps with at least one, and preferably both, AOs of the second ethylene as little as possible.     

Criteria for the affinity of dyes for fibres

An equation was obtained for evaluating the thermodynamic affinity of a disperse dye for a fibre. Quantities Δh _D and K _D , which are functions of the composition of the dye bath, temperature, and state of the fibre material, can characterize the change in the affinity of the dye for the fibre when the dyeing conditions are varied.     

焊制三通雌雄样板计算机放样软件的开发

应用VC 语言开发了焊制三通雌雄样板放样软件,该软件能快速、准确地完成正三通、斜三通、顺流三通、Y型三通雌雄样板的放样工作。详细介绍了程序的编制过程以及软件的特点。     

活性石灰回转窑用耐火砖损坏原因及对策

分析了活性石灰回转窑用耐火材料的损坏原因,认为炉衬的附着物质与氧化硅和氧化铁的反应有关,硅酸钙与CaO是结圈的主要成分.改善耐火材料可以提高其使用寿命.     

Comparison of different flowability tests for powders for inhalation

A series of placebo powders for inhalation was characterized regarding bulk density and powder flowability using different techniques. The powders were of the ordered mixture type and were prepared by mixing a pharmaceutical carrier grade of lactose with different fractions of intermediate sized and fine (i.e., micronized) lactose. A modified Hausner Ratio was obtained by measurement of the poured and the compressed bulk densities. Other tests investigated were the angle of repose, the avalanching behaviour using the AeroFlow, and the yield strength using the Uniaxial tester. Furthermore, the relation between ordered mixture composition and flowability was examined.Of the methods investigated, the modified Hausner Ratio discriminates well between the investigated powders and seems to have the widest measuring range. It was also found that the poured and compressed bulk densities provide information about the packing of the particles in the powders. A good correlation was obtained between the modified Hausner Ratio and the angle of repose. The AeroFlow was suitable for powders with a low percentage of fine particles, but could not discriminate between the more cohesive powders. The Uniaxial tester, on the other hand, seems to be better suited for more cohesive powders.Regarding the powder composition, addition of micronized particles has a strong influence on the flowability of ordered mixtures, while intermediate sized particles have little impact on the powder flow.     

建筑工程玻璃企业生产过程控制措施

房地产业的快速发展也给建筑工程玻璃企业带来了巨大的市场前景。面对如此机遇,企业如何对生产过程进行有效的控制,生产出客户满意的产品,使企业不仅具有良好的市场信誉度,而且也获得了发展空间。