含有延缓皮肤衰老组合物的护肤品在面部皮肤年轻化中的应用效果

探讨含有一种专利延缓皮肤衰老组合物的精华液与面霜对面部皮肤年轻化的改善效果。将上述产品分别开展4周单一产品试验和12周组合产品试验。两类试验均为自身前后对照研究,分别通过仪器测试或医生评估,评价受试者皮肤光泽度、弹性、纹理等指标。结果显示,研究结束时,受试者相关评价指标均有改善,与基线数据相比差异具有统计学意义（P<0.05）。表明含该组合物的护肤品有助于促进面部皮肤年轻化。     

基于Retinex图像增强算法的面部皮肤光泽度评价研究

研究基于Retinex图像增强算法的皮肤光泽度评价方法。通过对196名志愿者进行仿真实验,构建面部皮肤图库,利用单尺度Retinex算法将读入的人脸皮肤图像S(x,y)转换成反射图像R(x,y),计算出R(x,y)的像素均值和方差值,将其与使用光泽度测试仪测出的光泽度值分别归一化,并利用相对平方误差法进行误差分析。结果表明,R(x,y)像素均值法对面部皮肤光泽度评价效果理想,误差在0.13以内。     

上海地区310名女性皮肤生理参数和皮肤菌群随年龄的变化特征

为了解皮肤生理参数、皮肤菌群随着年龄增长的变化规律，于2021年7～8月，在上海某社区随机筛选符合条件的310名18～60岁健康女性受试者，采用非创伤性皮肤检测方法测试多项皮肤生理参数，并采用16S rRNA高通量测序分析面部皮肤菌群。结果显示，随着年龄增加，皮脂含量和经皮水分散失（TEWL）减少，而皮肤角质层含水量受年龄影响，不同年龄段呈现不同的变化规律。肤色（ITA°）随年龄增长越来越深，皮肤弹性随年龄呈下降趋势，特别是25岁之后显著下降（P<0.001）。随着年龄的增加，Shannon指数整体呈现上升趋势，说明面部皮肤细菌的物种多样性增加。物种组成分析表明，在门水平上，放线菌门（Actinobacteria）总体呈下降趋势，而变形菌门（Proteobacteria）总体呈上升趋势，相应地在属水平上，丙酸杆菌属（Cutibacterium）的丰度明显下降，而链球菌属（Streptococcus）和棒状杆菌属（Pseudomonas）的丰度总体呈上升趋势。Spearman相关性分析表明，皮肤生理参数和皮肤细菌丰度之间存在紧密关联，年龄是影响皮肤生理参数和菌群丰度变化的重要因素。...     

身体与面部皮肤的差异性与针对性护理

综述了身体与面部皮肤中的各项差异，包括皮肤细胞、角质层和皮肤附属器官导致的屏障结构的差异性，神经酰胺表达、游离脂肪酸含量和脂质结构3种屏障结构的差异性，以及经皮失水率（TEWL）、含水量以及经皮氧分压3个屏障功能相关指标的差异性。结果表明，除手足外，身体皮肤的屏障功能比面部皮肤更强，其中含有的神经酰胺碳链更长，同时含水量和TEWL相较于面部皮肤也更低。最后基于这种差异性，对眼部、脸部、唇部、躯干和手足这几个不同身体部位提出了针对性护理方式。     

无规共聚聚丙烯管材氧化诱导时间测试探究

以无规共聚聚丙烯（PP?R）管材为研究对象，采用差示扫描量热仪（DSC）测试了PP?R管材的氧化诱导时间（OIT），并研究了测试部位、样品直径、样品厚度以及取样方式等测试条件对OIT测试结果的影响。结果表明，从垂直管壁方向取芯层直径为6 mm、厚度为650 μm的试样进行测试时，OIT测试结果相对可靠。     

高浓度有机废水中总有机碳的测定方法试验研究

文章探索了测试高浓度有机废水中总有机碳(TOC)的测定方法.高浓度有机废水经过15倍稀释后测定TOC,获得了线性方程:COD(mg/L)=4.9524TOC(mg/L) 220.24,R=0.993,相关性良好,表明测试具有比较高的精确度.TOC指标衡量废水的污染程度比COD具有更多更好的优越性,预测今后几年在我国高浓度有机废水处理行业中将会得到越来越多的应用.     

蓄势待发,扬帆远航!

新年的钟声已经敲响,新春的脚步也已走近.我们共同经历了极不平凡的2020,迎来了充满期待的2021. 2020年,面对突如其来的新冠肺炎疫情,在党中央的坚强领导下,众志成城,坚忍不拔,取得了疫情防控和经济社会统筹发展的重大成果.同样地,中国涂料人也直面疫情挑战,攻坚克难,勇担社会责任,积极捐款捐物,在做好抗击疫情的同时...     

海外消息

德国汽车俱乐部公布冬季轮胎测试结果德国汽车俱乐部(Allgemeiner Deutscher Automobil Club,简称ADAC)公布冬季轮胎年度测试结果,测试的轮胎规格为2种普遍使用的轮胎规格:185/65R15T和225/45R17H。该组织     

沪芳纶子午胎开发项目通过市科委验收

日前 ,由上海轮胎橡胶 (集团 )股份有限公司轮胎研究所承担的上海市启明星项目之一——“芳纶子午线轮胎开发研究”顺利通过上海市科委验收。芳纶轮胎是当今轮胎行业的前沿技术和新产品 ,也是绿色环保轮胎的发展方向之一。在国际上 ,攻克该项目的轮胎厂不多 ,在国内尚属空白。1995年 ,上轮公司就明确了芳纶胎的研究方向。 1996年确立了以宽基载重子午胎385/ 6 5R2 2 .5为对象的研究课题。 1997年 4月申请了“上海市启明星”基金资助 ,于 1999年 12月完成。经测试 ,385/ 6 5R2 2 .5芳纶轮胎与同规格的钢丝胎相比 ,性能有较大提高 :重量降低 …     

Tencel和丝光羊毛混纺制品一浴染色的研究

该文采用Argazol TW活性染料对Tencel和丝光羊毛双组分纺织品进行同浴染色，详细研究了pH对Argazol TW活性染料染Tencel和丝光羊毛的上染率、固色率的影响，并测试了同浴染色时两种纤维的染色深度、色差和皂洗牢度等指标。     

含兵豆籽和红木籽提取物精华液控油及改善毛孔的功效

为研究含兵豆籽和红木籽提取物的精华液对改善人体面部油脂、角质层水分、毛孔的作用,选取了33名年龄为18～40岁、油性肤质、面部毛孔等级为1～3级的受试者,每天早晚使用含兵豆籽和红木籽提取物的精华液,持续使用4周.使用VISIA、Sebumeter SM815、Corneometer CM825仪器测试使用前后面部油脂、...     

一款保湿面贴膜的即时功效初步研究

采用配有水分测试探头CM825、色素测试探头MX18的皮肤弹性测试仪Cutometer MPA580,测定在使用一款保湿面贴膜前后及用后5 h内面部皮肤角质层含水量、黑色素含量及弹性的变化,评估面贴膜使用后改善皮肤水分、肤色及弹性的即时功效。结果表明使用该面贴膜有非常明显的即时功效,主要表现在皮肤水分含量较使用前有非常显著的增加（P〈0.05）,测得皮肤黑色素含量也明显降低（P〈0.05）,但弹性无明显增加。     

聚天冬氨酸钠在护肤品中的应用

利用皮肤水分测试仪和皮肤水分流失测试仪,考察了添加低、高分子量及不同质量分数聚天冬氨酸钠(PASP)的保湿化妆品作用于人体皮肤后的水分含量和经表皮水分散失情况。结果表明,高分子量PASP对皮肤的保湿效果较好、锁水效果显著,高分子量PASP在质量分数为0.8%时,使皮肤水分含量的增长率达到0.5%以上,对皮肤的保湿效果与透明质酸相当。使用皮肤弹性测试仪对新鲜猪皮进行了体外透皮实验,测试了使用PASP前后猪皮弹性状况的变化,表明PASP具有提高皮肤弹性的效果。PASP代替目前广泛使用的透明质酸作为化妆品中的保湿剂具有良好的发展前景。     

市售代表性面贴膜的使用效果与功效的比较研究

采用随机双盲和半脸对照的方式对市售具有代表性的6款面贴膜的感官效果和功效进行评价和研究。感官评价结果表明消费者喜欢香味清淡、膜布较溥、膜布颜色透明、贴合度好贴上后舒适透气、大小适合、揭掉后吸收速度较快、用后皮肤滋润光滑的面贴膜。功效测试结果表明6款面膜使用后在保温效果方面均有明显改善,符合市场宣称：在皮肤美白和弹性方面虽稍有改善,但改善效果与其包装上的宣称仍有一定差距。根据消费者的喜好和需求,开发出更加有效的产品是今后研发的方向。     

市售六款代表性面贴膜的肤感与安全性的比较研究

采用随机双盲和半脸对照的方式对市售具有代表性的6款面贴膜的感官、功效和安全性进行研究和评价感官评价结果表明消费者喜欢膜布较薄、膜布颜色透明、贴合度好、贴上后舒适透气、大小适合、揭掉后吸收速度较快、用后皮肤滋润光滑的面贴膜.功效测试结果表明消费者使用6款面膜15 min和35 min后皮肤角质层水分含量明显增加、皮肤弹性略有升高、皮肤黑色素含量略有降低.安全性测试发现6款面膜均有皮肤刺痛、眼部刺激、皮肤发热或瘙痒等不良反应症状（不适症状）出现,表明安全性方面均存在一定的隐患和改善的余地.根据消费者的喜好和需求,开发出更加温和有效的产品是今后研发的方向.     

Properties of paper coated with kaolin: The influence of the rheological modifier

The first part of this paper analyses the influence of the molecular weight and concentration of carboxymethyl cellulose (CMC) and of kaolin concentration on rheology of the coating colours and on paper properties coated with ultra lightweight coatings (ULWC). In the second part, relationships between the rheological characteristics of the coating colour formulations and coated paper surface quality was also studied.New indexes on paper roughness at micro-scale are presented (RZI and SRI). In general, they show good correlation with sheet gloss. A new gloss index (SGI) is presented, accounting for the contribution of gloss from machine direction (MD) and cross direction (CD). Porosimetry was used to access microstructural characteristics in order to correlate them with light scattering and gloss properties. The former property is closely related to Hg intrusion volume of the coated layer while gloss is related to surface porosity with pore diameters in the range of 7–15 μm as measured by Hg intrusion volume.     

Biological Mechanisms Underlying the Ultraviolet Radiation-Induced Formation of Skin Wrinkling and Sagging I: Reduced Skin Elasticity,Highly Associated with Enhanced Dermal Elastase Activity,Triggers Wrinkling and Sagging

The repetitive exposure of skin to ultraviolet B (UVB) preferentially elicits wrinkling while ultraviolet A (UVA) predominantly elicits sagging. In chronically UVB or UVA-exposed rat skin there is a similar tortuous deformation of elastic fibers together with decreased skin elasticity, whose magnitudes are greater in UVB-exposed skin than in UVA-exposed skin. Comparison of skin elasticity with the activity of matrix metalloproteinases (MMPs) in the dermis of ovariectomized rats after UVB or UVA irradiation demonstrates that skin elasticity is more significantly decreased in ovariectomized rats than in sham-operated rats, which is accompanied by a reciprocal increase in elastase activity but not in the activities of collagenases I or IV. Clinical studies using animal skin and human facial skin demonstrated that topical treatment with a specific inhibitor or an inhibitory extract of skin fibroblast-derived elastase distinctly attenuates UVB and sunlight-induced formation of wrinkling. Our results strongly indicated that the upregulated activity of skin fibroblast-derived elastase plays a pivotal role in wrinkling and/or sagging of the skin via the impairment of elastic fiber configuration and the subsequent loss of skin elasticity.     

Structure and mechanical properties of new hybrid composites based on polyamide 6,6 reinforced with both glass fibers and a semiaromatic liquid crystalline polyester

Polyamide 6,6 (PA66) composites with 30% glass fiber (GF) were blended with a semiaromatic liquid crystalline copolyester (Rodrun 5000 (R5)) up to 40% R5 by injection molding. The composites showed two amorphous phases. Interchange reactions took place between the two polymers, leading to good interfacial adhesion. The addition of 20% R5 was enough to counteract the viscosity increase provided by the GF. The synergistic increases in the modulus of elasticity were attributed to the increase in the skin thickness at increasing R5 content. The tensile strength of the composites remained constant on LCP addition, despite the lower tensile strength of R5 compared with that of PA66/GF. The notched impact strength increased notably at increasing R5 content. Polym. Compos. 25:601–608, 2004. © 2004 Society of Plastics Engineers.     

混合植物油与白油对皮肤的综合作用比较

通过让受试者分别在前臂内侧皮肤（6h短效试验组）和面部皮肤（30d长效试验组）上使用含混合植物油和白油的膏霜样品,考察了混合植物油和白油对皮肤水分含量、经表皮失水率（TEWL）、摩擦力、弹性的短期和长期影响以及对皮肤皱纹的长期影响。结果显示,混合植物油在短期和长期内均能有效提高皮肤水分含量和降低水分流失,长期使用能有效提高皮肤弹性和降低皮肤皱纹面积、皱纹长度、皱纹深度;白油在短期和长期内也能一定程度提高皮肤水分含量和减少水分流失,长期使用对皮肤皱纹深度有降低作用,效果均不及植物油。涂抹后6小时,植物油能降低皮肤摩擦力,白油能提高皮肤摩擦力,长期使用两种油脂均能提高皮肤摩擦力。     

Physical and flow properties of pecan shells—Particle size and moisture effects

Pecan shells are the byproduct of the processing of pecans for human consumption. The potential use of these shells for bioenergy and other value-added applications requires information on the physical and flow properties. These properties are needed for the design of storage, processing and handling equipment. The effects of particle size and moisture content on bulk density, particle density, tap density, compressibility, angle of repose, cohesion, angle of internal friction and flowability were quantified in this study. Equilibrium moisture relations for the shells were also determined at temperatures ranging from 10 to 50 °C. The densities (bulk, particle and tap) significantly decreased and compressibility significantly increased with increases in particle size and moisture content. Increasing the moisture content reduced its flowability from free flowing (flow index of 15.77) at a moisture content of 4.2% (w.b.) to cohesive (flow index 3.14) at a moisture content of 24.6% (w.b.). The cohesive strength of pecan shells also increased with particle size (0.58 to 1.14 kPa) and with moisture content (0.36 to 1.69 kPa). An average angle of internal friction of 41.28° was obtained and was not significantly affected by moisture content and particle size. The angles of repose of pecan shells varied from 33.1 degrees to 46.3 degrees. The equilibrium moisture relation curves for the shells were sigmoidal in shape and showed that pecan shells should be stored at moisture contents of less than 18.03% (w.b.) to minimize microbial activity. The equilibrium moisture relation curves were best predicted by the modified Henderson equation.